Title of Invention

"COVER STRUCTURE OF A SCOOTER"

Abstract

[Object] To provide a floor structure of a scooter type vehicle in which a floor cover can be easily removed to perform a maintenance work for a muffler or the like under a simple configuration of less number of component parts and the work can be easily carried out. [Solving Means] A floor structure of a scooter type vehicle in which a low floor is arranged at a forward or rearward central part of the vehicle, a vehicle frame 7 at the rear part of the floor is raised in a rearward direction and a power unit 21 is pivotally supported below the vehicle frame , wherein a floor cover 50 constituting the floor is raised rearwardly at its rear part 52 to cover a lower front part right and left sides of the raised part of the vehicle frame 7, the upper end of the rear part 52 of the floor cover is cooperatively coupled to the front part lower end of the body cover 50 entirely covering a circumference of the vehicle body frame 7 at a rear part of said floor, and a connected part A between the floor cover 50 and the body cover 55 is positioned at a higher location than that of a fixing part B of the exhaust pipe 35 of the power unit 21.

Full Text

[Detailed Description of the Invention] [0001] [(Technical -Field of the Invention] This invention relates to a cover of a scooter structure,such as a floor cover in a step floor and a body cover for enclosing a lower circumference of a seat in a scooter type vehicle having a low floor at a central part of forward or rearward direction of the vehicle body. In addition, the present invention relates to a rear fender fixing structure in a scooter type vehicle in which a rear fender is fixed to the lower part of the rear portion of the vehicle frame raised from the rear part of the floor toward a rear upper part. [0002] [Prior Art and Problem to be Solved by the Invention] It is generally found in a floor cover of a scooter type vehicle that the floor cover is not usually removed for its maintenance work or the like, so that the floor cover is fixed at an initial stage in assembling work, and a body cover is fixed in compliance with the fixed floor cover. [0003] Even in the case that an exhaust pipe fixing part for an internal combustion engine at a front part of a power unit is fixed or removed in order to perform a maintenance work for a muffler or the like, a large-sized body cover is removed and its work is not easily carried out. In view of this fact, the body cover was provided with a maintenance lid, the body cover was divided and the right and left side covers were coupled to each other (Gazette of Patent Laid-Open No. Sho 62-94485 and the like). [0004 ] However, there are some disadvantages that a die or the like for a maintenance lid or a side cover is required, its cost becomes high, it requires a large number of assembling steps and its working efficiency is not superior. The present invention described in Claims 1 to 3 has been made in view of such disadvantages as above and its object is to provide a less-expensive floor structure of a scooter-type vehicle in which its structure is simple in less number of component parts, a floor cover can be removed also during a maintenance work for a muffler or the like and the maintenance work can be performed easily. Since a scooter type vehicle has a low floor at its forward or rearward central part of the vehicle, various kinds of devices are arranged in a space between a seat and a power unit, and in particular, a large-sized member such as a fuel tank is arranged at a lower part of the seat front part having a more relative surplus space than a narrow rear part of an arranging space where a rear wheel oscillates in an upward or a downward direction. In view of this fact, it has already been proposed to provide a scooter type vehicle in which the fuel tank is arranged below the front part of the seat and the seat can be opened or closed, wherein an electrical element storing box is integrally formed at the body cover covering a rear part of the vehicle body (a gazette of Japanese Utility Model Laid-Open No. Sho 57-28081). [0007] However, an oil tank must be installed in addition to the electrical elements, and additional fastening members for the oil tank are required, resulting in that normally one-point or two-points bolt fastening assembly is applied. Accordingly, the prior art had some disadvantages that a high investment amount was required for the fixing members or the like, it required a large number of component parts and its assembling work was troublesome. [0001] The invention described in Claims 4 to 9 of the present patent application has been accomplished in view of the aforesaid points and its object consists in providing a less -expensive body cover structure in which the part for use in fixing the oil tank or the electrical elements in the scooter type vehicle is integrally formed in the body cover, the die investment is reduced, the less number of component parts is required and its assembling work may also be easily carried out. [Means for Solving the Problem, Actions and Effects] In order to attain the aforesaid object, the invention described in Claim 1 provides a cover structure of a scooter type vehicle in which a low floor is arranged at a forward or rearward central part of the vehicle, a vehicle frame at the rear part of said floor is raised in a rearward direction and a power unit is pivotally supported below the vehicle frame characterized in that a floor cover constituting said floor is raised rearwardly at its rear part to cover a lower front part , right and left sides of the raised part of said vehicle frame, the rear part upper end of said floor cover is cooperatively coupled to the front part lower end of the body cover entirely covering a circumference of the vehicle body frame at a rear part of said floor, and a connected part between said floor cover and the body cover is positioned at a higher location than an exhaust pipe fixing part of said power unit. The invention described in Claim 1 is constructed as described above, wherein the connecting part between the floor cover and the body cover is positioned at a higher location than an exhaust pipe fixing part of the power unit, so that when only the floor cover is removed, the exhaust pipe can easily be fixed to or removed from it, its maintenance work can be simplified and concurrently a lid or a side cover for use in performing a maintenance work can be eliminated, the die investment for the work is not required, the number of component elements as well as the number of steps can be reduced, its working efficiency can be improved as well and its cost may also be reduced . [0011] A cover structure of a scooter type vehicle as set forth in Claim 1 in which the connecting part between said floor cover and the body cover is made such that the fixing part of said floor cover is overlapped outside the fixing part of said body cover and fastened to it, resulting in that only the floor cover may easily be removed in respect to the body cover being fixed and thus a maintenance work for the exhaust pipe or the muffler can be performed in an easy manner. The floor structure of scooter type vehicle as set forth in Claim 2 in which a connecting part between said floor cover and the body cover is made such that engaging claws are provided at one of them, engaging holes are provided at the other and both of them are engaged and connected to each other to enable an easiness of fixing or removal of the floor cover to be positively assured and the connection with the body cover can be made positively. {0013]- In addition, in order to accomplish the aforesaid object, the invention described in Claim 4 of the present patent application is a cover structure of a scooter type vehicle as set forth in Claim 1 in which said vehicle frames support a fuel tank and an oil tank covered by an openable or closable seat, circumferences of said vehicle frames are integrally covered by the body cover over their forward or rearward directions, said body cover has integrally a lower opening concave part covering from above said oil tank and an upper opening concave part storing and supporting an electrical component or the like, and a top wall of said lower opening concave part is punched with an upper opening passing and projected above an oil supplying port of said oil tank. Since the invention described in Claim 4 is constructed as described above, the body cover has the lower opening concave part and the upper opening concave part integrally formed to each other, the lower opening concave part covers above the oil tank, the oil tank can be fixed and the electrical components are stored in the upper opening concave part, so that the fixing members for the oil tank or the electrical components are not required, the die investment can be reduced, the number of component parts can be reduced, the assembling work can be easily performed and its cost may also be reduced. The cover structure of the scooter type vehicle described in Claim 4 is made such that said lower opening concave part and said upper opening concave part are arranged at a rear part of said fuel tank, resulting in that the fuel tank-can be arranged at a lower front part of the seat, the oil tank and the electrical components are arranged at the rear part of it so as to enable a superior space efficiency structure to be attained. The cover structure of the scooter type vehicle described in Claim 4 or 5 is made such that said lower opening concave part and said upper opening concave part are arranged integrally in common to be adjacent to each other, resulting in that the body cover shape can be simplified and at the same time the oil tank and the electrical components or the like can be efficiently arranged there. The cover structure of the scooter type vehicle described in Claim 6 is made such that said lower opening concave part and said upper opening concave part are arranged in a forward or a rearward direction, resulting in that the oil tank and the electrical components or the like can be easily stored within a lateral width size of the seat. The cover structure of the scooter type vehicle described in any one of Claims 4 to 7 is made such that a projection formed at the upper wall of said oil tank is fitted to and engaged with a slit formed at a predetermined position in the top wall of the lower opening concave part of said body cover, resulting in that the oil tank can be fixed by the body cover without using any screw or the like and the assembling work can be easily carried out. The cover structure of the scooter type vehicle described in any one of Claims 4 to 8 is made such that a projection formed at the lower wall of said oil tank is fitted to and engaged with a slit formed at a predetermined position in said vehicle body frame/ resulting in that a holding of the oil tank in respect to the body frame can be carried out without using any fastening member such as a screw or the like and the oil tank can be fixed along with the fitting of the body cover with the lower opening concave part. The present invention relates to a cover structure of a -Vineet Rohill scooter, wherein a low floor is arranged at a forward or rearward central part of the vehicle, a vehicle frame at the rear part of said floor is raised in a rearward direction Vineet Rohill characterized in that a floor cover constituting said floor is raised rearwardly at its rear part to cover a lower front part, right and left sides of the raised part of said vehicle frame, the rear part upper end of said floor cover is cooperatively coupled to the front part lower end of the body cover entirely covering a circumference of the vehicle body frame at a rear part of said floor, and a connected part between said floor cover and the body cover is positioned at a higher location than an exhaust pipe fixing part of said power unit [Brief Description of the Accompanying Drawings] [Fig.l] This is a side elevational view for showing a scooter type motorcycle of one preferred embodiment having a cover structure and a rear fender structure of the present invention. [Fig.2] This is a side elevational view for showing a down-frame and a rear-frame in a cover structure and a rear fender structure of the scooter type motorcycle. [Fig.3] This is a top plan view of Fig.2. [Fig.4] This is a top plan view of a floor cover. [Fig.5] This is a side elevational view of Fig.4. [Fig.6] This is a top plan view of a body cover. [Fig.7] This is a side elevational view of Fig.6. [Fig.8] This is a front elevational view of Fig.6. [Fig.9] This is a rear view for showing a leg shield. [Fig.10] This is a view taken along an arrow X of Fig.9. [Fig.11] This is a side elevational view with a part of a floor portion of the scooter type motorcycle being broken away. [Fig.12] This is a sectional view taken along a line XII-XII of Fig.11. [Fig.13] This is a top plan view for showing a rear sub-frame. [Fig.14] This is a side elevational view in longitudinal section taken along a line XIV-XIV of Fig.13. [Fig.15] This is a cross sectional view taken along a line XV-XV of Fig.13. [Fig.16] This is a cross sectional view taken along a line XVI-XVI of Fig.13. [Fig.17] This is a cross sectional view taken along a line XVII-XVII of Fig.13. [Fig.18] This is a sectional view for showing a substantial part at a rear part of the vehicle body. [Fig.19] This is a sectional view taken along a line XIX-XIX in Fig.18. [Fig.20] This is a sectional view taken along a line XX-XX in Fig.18. [Fig.21] This is a sectional view for showing a connected part of a rear sub-frame, a body cover and a front end of a carrier. [Fig.22] This is a side elevational view for showing a fixed state of a rear sub-frame, a body cover and a front end part of a carrier. [Fig.23] This is an enlarged view for showing a part XXIII in Fig.2. [Fig.24] This is a cross sectional view taken along a line XXIV-XXIV of Fig.2. [Fig.25] This is a cross sectional view taken along a line XXV-XXV of Fig.2. [Fig.26] This is a side elevational view for showing a rear fender. [Fig.27] This is a top plan view of Fig.22. [Fig.28] This is a cross sectional view taken along a line XXVIII-XXVIII of Fig.27. [Fig.29] This is a front elevational view of a rear fender. [Fig.30] This is a top plan view of a body cover. [Fig.31] This is an enlarged side elevational view in longitudinal section for showing a substantial part of Fig.18. [Fig.32] This is an enlarged side elevational view in longitudinal section for showing a substantial part of Fig.18. [Fig.33] This is a cross sectional view taken along a line XXXIII-XXXIII of Fig.31. [Fig.34] This is a side elevational view in longitudinal section taken along a line XXXIV-XXXIV. [Fig.35] This is a cross sectional view taken along a line XXXV-XXXV of Fig.31. [Fig.36] This is an exploded perspective view for showing the prior art frame structure. [Preferred Embodiment of the Invention] At first, referring to Figs.l to 12, one preferred embodiment of the present invention described in Claims 1 to 3 will be illustrated and described as follows. As shown in Fig.l, a scooter type motorcycle 1 is comprised of a front wheel 3 and a rear wheel 4 at a forward or a rearward location of a vehicle body frame 2, the vehicle body frame 2 is comprised of a head pipe 5, a round tubular down frame 6 suspending downwardly from the head pipe 5 and extending below a floor cover 50 in a substantial horizontal rearward direction and a rear-frame 7 integrally coupled to a rear end 6a of the down-frame 6 and having a hollow rectangular section (a size in a vehicle width direction is larger than this one), wherein a front lower part 7a of the rear-frame 7 is curved toward a lower rear direction and at the same time it is extended in a rearward direction to cover the lower part of the rear power unit 21. [0021]- In addition, as shown in Fig.2, the rear end 6a of the down-frame 6 is bent slightly in a downward direction, its upper surface is formed to be flat in such a way that it may be close contacted with the curved lower surface of the rear frame 7 and both side edges of the abutting parts of the down-frame 6 and the rear-frame 7 are integrally coupled to each other by welding. Further, as shown in Fig.2, a forward gusset 8 is abutted against an upper surface of a horizontal rear part 6b of the down-frame 6 located at a more forward location than the abutting part between the down-frame 6 and the rear-frame 7 and against a front surface of a raised part 7b of the rear-frame 7 located at a more upward position than an abutting part between the down-frame 6 and the rear-frame 7, both side edges of the abutted part are integrally coupled to each other by welding, a coupled part between the down-frame 6 and the rear-frame 7 is supplemented and reinforced. [0023] Further, as shown in Fig.2, a rear gusset 9 is welded to the rear surface and both side surfaces of the curved part 7c above the raised part 7b of the rear-frame 7 so as to supplement and reinforce the curved part 7c of the rear-frame. A main stand bracket 10 is fixed to a rear end of a lower rear part extending portion 7d extended rearwardly from the forward lower part 7a of the rear-frame 7, a main stand 11 is pivotally arranged at the main stand bracket 10 and it may be freely raised or lowered by an installed tension coil spring 13. [0024] A hanger sleeve 14 is passed through and welded to both right and left side surfaces of a raised part 7b of the rear-frame 7 and both right and left side surfaces of the front gusset 8, extremity ends of a pair of right and left hanger rings 16 are integrally installed at both ends of the hanger pin 15 fitted to the hanger sleeve 14, a front end of the power unit 21 is fixed to the rear ends of the hanger rings 16 through a fixing pin 17, resulting in that the power unit 21 may be oscillated in upward or downward direction. In addition, a shock absorbing unit supporting shaft 19 is welded to the upper rear end part 7e of the upper part 7c of the rear-frame 7 through a bracket 18 welded to its left side surface while being directed toward a vehicle width direction, an ignition coil fixing stay 20 is welded to the right side surface of the upper rear end 7e and the abutting part between the base end of the shock absorbing unit supporting shaft 19 and the ignition coil fixing stay 20 is also welded. ['00361 The power unit 21 is comprised of an internal combustion engine 22, a V-belt continuously variable transmission 23 and a gear reducer 24, the rear wheel 4 is integrally installed at an output shaft of the gear reducer 24, both upper and lower ends of the shock absorbing unit 26 are pivotally arranged at the shock absorbing unit supporting shaft 19 of the upper rear end 7e of the rear-frame 7 and the fixing shaft 25 of the power unit 21, and a weight of a rear half part of the scooter type motorcycle 1 is supported by the rear wheel 4 through the shock absorbing unit 26 and the power unit 21. [00027] A carburetor 34 is arranged at a rear part of a cylinder inclined slightly toward a rear part of the internal combustion engine 22, and an air cleaner 33 is arranged above the V-belt continuously variable transmission 23 at a further rear part and left side of the carburetor 34. A base end fastening part 35a for the exhaust pipe 35 is fastened to the exhaust pipe fixing part 22a at a front surface of the cylinder of the internal combustion engine 22, the exhaust pipe 35 is extended forwardly, the exhaust pipe 35 is extended forwardly, thereafter it is curved to a rightward side of the vehicle body, runs in a downward direction below the front surface of the internal combustion engine 22, extends in a rearward direction at the right side of the vehicle body and further it is connected to a muffler 36. [0028] In turn, at the front part of the vehicle, a steering shaft 30 is fitted to the head pipe 5 in such a way that it may be turned in a rightward or a leftward direction, a steering handle 31 is integrally installed at the upper end of the steering shaft 30, and at the same time, a pair of right and left front forks 32 are integrally installed at the lower end of the steering shaft 30 and then the front wheel 3 is rotatably pivoted at the lower ends of the front forks 32. [0029] A pair of floor pipes 27 directed toward the width direction of the vehicle are passed through a forward or a rearward direction at the central part of the width in upper and lower directions between the horizontal central part 6c and the horizontal rear part 6b extending in a rearward direction at the step floor of the down- frame 6 in the vehicle frame 22 and integrally fixed to the down-frame 6 by welding. The floor brackets 28 are integrally fixed to both right and left upper ends of the floor pipe 27 by welding (refer to Figs. 2 and 3) and a floor cover 50 is arranged in tension onto the floor bracket 28. An aluminum rear sub-frame 29 is extended in a further rearward direction and integrally arranged at the upper rear end 7e of the rear-frame 7. A fuel tank 37, an oil tank 38 and a battery 39 are arranged in sequence from the front part to the rear part above the rear-frame 7 and the rear sub-frame 29, and a seat 40 pivotally supported at its front end to the front end bracket of the fuel tank 37 covers the fuel tank 37, the oil tank 38 and the battery 39 or the like from above in such a way that it may be freely opened or closed. At a lower part of the seat 40, a body cover 55 entirely covers a circumference of the rear-frame 7 and the rear sub-frame 29. A center cover 44 cooperatively connected to the front upper end of the body cover 55 covers the forward lower part of the fuel tank 37. When the seat 40 covers above the fuel tank 37, the oil tank 38 and the battery 39 or the like to close them, the lower end circumference of the seat 40 is contacted with the upper end edges of the center cover 44 and the body cover 55 to make a close closed state. The rear part of the body cover 55 covers the upper part of the upper rear fender and the front lower end of the body cover 55 is cooperatively connected to the upper end of the raised part 52 at the rear part of the floor cover 50. In turn, from the front part of the floor cover 50 is arranged a leg shield 42 covering the front part of the down-frame 6 and raised upwardly along the down-frame 6, a front fender 41 extending forwardly from the central part of the leg shield 42 is positioned above the front wheel 3 and integrally installed at the front fork 32. The cover covering the vehicle body is substantially constituted as described above. As shown in Figs. 4 and 5, a detailed configuration of the floor cover 50 is comprised of a horizontal plate part 51 on which legs of a driver are placed and of a raised part 52 at its rear part. [0034] The horizontal plate part 51 has at its front central part a concave part through which the down-frame 6 passes, it has such a shape as one in which its right and left sides are applied as a front part of the leg mounting parts 511 and Sir, and hub parts 51b having a bolt hole 5la extending in a downward direction are formed to pass through each of the forward and rearward directions of both leg mounting portions 511 and Sir, respectively. In addition, the horizontal plate part 51 has each of fixing pieces 51c projecting in a downward direction near the right and left side edges of slant rear portions of the right and left front side hub portions 51b, respectively. [•0035] The upper surface of the horizontal plate part 51 has some flat small column-like projections at its entire surface, five outer side projections 51d of the front side bolt hole 51a have a high projection height, the projections at front and outer sides show gradual high levels so as to prevent the legs of the driver from being directly applied to the leg shield through such projections 51d as above and its load from being applied to the shield. In addition, the rear surface of the horizontal plate part 51 is formed with grid-like ribs 51e. [0036] The rear raised part 52 of such a horizontal plate part 51 as above is raised upwardly from the rear edge of the horizontal plate part 51 and concurrently its right and left sides are extended rearwardly in a substantial amount so as to form a U-shaped opening as viewed from its top plan view (refer to Fig.4). [0037] An upper end edge 52a of the raised part 52 which is also in U-shaped form is slightly extended in an inward direction to form a horizontal same plane, inward projecting pieces 52b are arranged at the forward or rearward two locations at its right and left symmetrical positions and slit-like engaging holes 52c are punched at the projecting pieces 52b. In addition, a forward central part of the upper end edge 52a is concaved rearwardly, a vertical rectangular plate-like fixing part 52d is formed with a threaded hole being formed at its central part and a part near the fixing part 52d of the upper end edge 52 is recessed. [0038] In turn, as shown in Figs.l, 6 to 8, the body cover 55 is comprised of a cover front part 56 covering the forward portion and the right and left portions of the front part of the rear-frame 7 and having a wide-opened upper part, a cover middle part 57 being continuous with the slant upper part of the cover front part 56 and having either the oil tank 38 or the battery 39 installed therein and a cover rear part 58 extending rearwardly in a continuous manner of the cover middle part 57 and covering the upper part of the rear-fender. The cover middle part 57 is made such that the right and left side walls 57a are raised to cover its upper part with a substantial horizontal top wall 57b, a round opening 57c is formed at a central part of the forward half part of the top wall 57b and then an upper opening concave part 57d concaved in a rectangular shape substantially in a downward direction is formed at the rear half part of the rear top wall 57b. A lower opening concave part 57e enclosed by the front half part of the top wall 57b, the right and left side walls 57a and the front wall of the upper opening concave part 57d is applied to cover the oil tank 38 from above, an oil feeding port projected above the oil tank 38 passes through the round opening 57c. The rear upper central opening concave part 57d of the oil tank 38 is a parallelpiped storing space and then the battery 39 is stored from above. [0041] The cover front part 56 is made such that its lower end edge 56a is formed into the U-shape in correspondence with the upper end edge 52a of the raised part 52 of the floor cover 50 and then the forward or rearward two engaging claws 56b are projected downwardly at the right and left symmetrical locations of the lower end edge 56a. The engaging claws 56b are positioned and projected slightly more inwardly than the cover side walls/ extend forwardly from the lower part and form an L-shape as viewed from a side elevational view. From the central part of the forward portion of the lower end edge 56a of the cover front part 56 is positioned a fixing piece 56c at a slight inner location and projected downwardly. The engaging claws 56b of the body cover 55 correspond to the engaging holes 52c of the projecting pieces 52b arranged at the upper end edge 52a of the raised part 52 of the floor cover 50, and the fixing piece 56c of the body cover 55 corresponds to the fixing part 52d of the floor cover 50. It is possible to move the raised part 52 of the floor cover 50 from the forward part to the rearward part below the cover front part 56 in respect to the body cover 55 being kept to be fixed to the rear-frame 7 and the rear sub-frame 29. {0043] - At that time, the floor cover 50 is slightly inclined to cause the engaging claws 56b of the body cover 55 to be fitted into the engaging holes 52c of the floor cover 50, resulting in that the L-shaped engaging claws 56b are engaged with the engaging holes 52c and the upper end edge 52a of the raised part 52 of the floor cover 50 is contacted with the lower end edge 56a of the cover front part 56 of the body cover 55, both of them are cooperatively connected to each other and at the same time the fixing part 52d of the floor cover 50 is contacted from outside against the fixing piece 56c projected from the front central part of the cover front part 56 The fixing part 52d and the fixing piece 56c are fastened by a screw 70 through a washer 71. When the screw 70 is removed, the fixing part 52d of the floor cover 50 is located outside the fixing piece 56c of the body cover 55, so that it is possible to remove only the floor cover 50 while the body cover 55 is being fixed. A cooperative connecting part A between the floor cover 50 and the body cover 56, i.e. an abutting surface between the upper end edge 52a of the floor cover 50 and the lower end edge 56a of the body cover 55 is positioned more above than the fixing part B where the base end fastening part 35a of the exhaust pipe 35 is fastened to the exhaust pipe fixing part 22a at the front surface of the cylinder of the internal combustion engine 22 as shown in Fig.l. Accordingly, when the floor cover 50 is removed while the body cover 55 is being assembled, the fixing part B of the exhaust pipe 35 appears and then the exhaust pipe 35 can be fixed or removed. [0046} In turn, as shown in Figs. 9 and 10, the leg shield 42 is constructed such that the brackets 42a are extended rearwardly in a horizontal direction at the right and left lower ends and the bolt holes 42d are punched at the desired locations of the brackets 42a. In addition, threaded holes 42c are punched at the lower ends of the right and left side walls of the leg shield 42. Further, horizontal projections 42d are formed in a horizontal direction along the inner surface of the side wall at a slight higher location than the brackets 42a. -f-0047 ] The right and left floor brackets 28 integrally arranged at the down- frame 6 through the floor pipe 27 are provided with bolt holes 28a in their forward or rearward direction, nuts 28b are welded to the lower surfaces of the bolt holes (see Fig. 3) , a lower end bracket 42a of the leg shield 42 is supported at front ends of the floor brackets 28, the front parts of the right and left leg mounting parts 511, Sir of the floor cover 50 are overlapped on the bracket 42a through hub parts 51b and at this time, the front end edges of the right and left leg mounting parts 511, 51r are supported by the projections 42d formed at the inner surface of the side wall of the leg shield 42. In this way, as shown in Fig. 11, the bracket 42a and the hub part 51b are overlapped on the front end of the floor bracket 28 in this order, and then each of the bolt holes 28a, 42b and 51a is coincided to each other, a bolt 72 is passed through the holes from above and threadably fitted to a nut 28b and fastened there. Accordingly, the lower end bracket 42a of the leg shield 42 and the front parts of the leg mounting parts 511, Sir of the floor cover 50 are integrally fastened together with the bolt 72 to the floor bracket 28. In addition, the rear portions of the leg mounting parts 511, Sir of the floor cover 50 are supported on the rear end of the floor bracket 28 through the hub part 51b, a bolt 73 is passed from above through the bolt hole 5 la and the bolt hole 28b, threadably fitted to the nut 28b and fastened there. In addition, as shown in Fig. 12, the fixing piece 51c projected near the front right and left edges of the floor cover 50 is oppositely faced against the threaded hole 42c arranged at the right and left side wall lower ends of the leg shield 42 and fastened by the screw 74 through a washer 75. [0050] As described above, since the floor cover 50 is fixed to the vehicle body, only the floor cover 50 can be removed while the body cover 55 and the leg shield 42 are being fixed to the vehicle body. That is, if the forward and rearward bolts 72, 73 of the right and left leg mounting parts 511, Sir of the floor cover 50, the screw 70 at the fixing part with the body cover 55 and the screw 74 at the fixing part of the leg shield 42 are removed, the floor cover 50 can be easily removed and in turn if the floor cover 50 is removed, the fixing part B of the exhaust pipe 35 for the internal combustion engine 22 is exposed, so that fixing or removal of the exhaust pipe 35 can be performed and a maintenance work for the muffler 36 or the exhaust pipe 35 or the like can be easily carried out. E0052]. Reversely, in the case that the floor cover 50 is to be fixed, the raised part 52 is slightly inclined and fitted to the lower part of the cover front part 56 of the body cover 55 while the floor cover 50 is being mounted on the down-frame 6 and the floor bracket 28 between the leg shield 42 and the body cover 55, thereby the engaging claws 56b of the body cover 55 are fitted to the engaging holes 52c of the floor cover 50 and engaged with them. At this time, the assembling can be easily carried out by flexing the leg shield 42 in a forward direction. [0053] Then, if the forward and rearward bolts 72, 73 of the right and left leg mounting parts 511, Sir of the floor cover 50, the screw 70 at the fixing part with the body cover 55 and the screw 74 at the fixing part of the leg shield 42 are threadably fitted and fastened, the fixing of the floor cover 50 is completed and its connecting part with the body cover 55 is positively connected under an engagement between the engaging claws 56b and the engaging holes 52c. As described above, the floor cover 50 can be independently fixed or removed without removing either the large-sized body cover 55 or the leg shield 42 and if the floor cover 50 is removed, maintenance of the muffler 36 or the like can be easily carried out. A lid or a side cover or the like for maintenance work can be eliminated, investment for a die or the like is not be required, a less number of component parts and a less number of assembling steps are required, resulting in that its cost can be reduced. Next, referring to Figs.l to 3, Figs. 6 to 8 and Figs. 13 to 21, one preferred embodiment of the present invention described in Claims 4 to 9 in the present patent application will be illustrated and described. The items already described above will be eliminated for their repetitive description. The upper part 7c of the rear-frame 7 is formed with a tank fixing sleeve 7f at its front side and with a side hole 7g at its rear side, the rear end 7e is opened, its opening lower wall is punched with a pair of right and left holes 7h and at the same time a shock absorbing unit supporting shaft 19 is welded in a vehicle width direction through a bracket 18 welded to the left side surface of the rear end 7e, an ignition coil fixing stay 20 is welded to the right side surface of the upper rear end 7e and the abutting part between the base end of the shock absorbing unit supporting shaft 19 and the ignition coil fixing stay 20 is also welded. [ 0056 ] The rear sub-frame 29 supporting the body cover 55 below the seat 40 is fitted from the opening of the upper rear end 7e of the rear-frame 7 having a hollow parallelpiped section toward a forward deep side and extends rearwardly, and a shape of the rear sub-frame 29 is shown in Figs. 13 and 14. The rear sub- frame 29 at its front part as viewed from its side elevational view is slightly curved downwardly to form a front side slant part 29a, its rear part forms a rear side horizontal part 29b supported in a horizontal state (refer to Fig. 14), the front side slant portion 29a has ribs 29c directed in a forward or a rearward direction in a vertical orientation at the right and left end edges and at the central part, respectively, the front end is formed with a partial bro ken-away hole 29d and then a pair of right and left holes 29e are punched between the rear ribs 29c. [ 0038 ] In addition, the rear side horizontal part 29b has a fixing hole 29f at its central part of the front part, the right and left raised supporting parts 29g at the central part are punched upwardly, a cylindrical hub 29h is projected at the upper end surface, the cylindrical hub part 29h is formed with a threaded hole 29i, the rear end part 29i is provided with a hole I 29k, and a hole 291 is arranged at a slight forward position of the hole 29k. The front slant part 29a of the rear sub- frame 29 is fitted to the upper rear end part 7e of the rear-frame 7, the front end hole 29d is aligned with the side hole 7g of the rear-frame 7, and as shown in Fig. 18, the bolt 60 is passed and supported, and concurrently a bolt 61 is passed through the rear hole 29e and the rear end 7h of the rear-frame 7 , threadably fitted and fastened with a nut 62, resulting in that the front slant part 29a of the rear sub-frame 29 is integrally fixed to the upper rear end 7e of the rear-frame 7. In addition, the fuel tank 37 has at its forward or rearward lower surface a pair of right and left tank brackets 37a, 37b projected, respectively, and as shown in Pig.l, the front side tank bracket 37a is coupled to the tank fixing sleeve 7f of the rear-frame 7 with a bolt 108, the rear side bracket 37b is coupled with the bolt 60 passing through the front end hole 29d of the rear sub- frame 29, resulting in that the fuel tank 37 is integrally fixed to the rear-frame 7. f 0061 1 A rear-fender 65 is fixed below the rear sub-frame 29 integrally fixed to the rear-frame 7 . The rear-fender 65 is gradually curved in a forward or a rearward direction as shown in Fig. 18, wherein the engaging piece 65a formed the front left side part is engaged with the upper part of the shock absorbing unit supporting shaft 19 from its front side, the engaging part arranged at the front right side is engaged with the extremity end of the ignition coil fixing stay 20 and the front part of the rear-fender 65 is supported by it. In turn/ the rear part of the rear-fender 65 is supported at the rear sub- frame 29 by coinciding the hole formed at the upward expanded fixing part 65b with the hole 291 of the rear sub-frame 29, passing a bolt 66 therethrough, threadably engaging it with a nut 67, fastening it. In this way, the rear-fender 65 is suspended below the rear sub-frame 29. Further, a fixing structure for this linear fender 65 will be described in detail. Then, a shape and a fixing structure of the body cover 55 will be described as follows. As shown in Figs. 6 to 8, the body cover 55 is made of synthetic resin, and its front upper part is recessed to form an opening part 56d, and a center cover 44 covering from the front side the opening 56d is removably installed at the opening 56d. Then, as described above, the lower end edge of the front part 56 of the body cover 55 is of a U-shape, two engaging claws 56b are projected downwardly at the right and left symmetrical positions in a forward and rearward direction, a fixing piece 56c is projected at a front end central part, either an engaging hole or a fixing piece (refer to Fig. 4) is correspondingly arranged at the upper end edge having also a U-shape of the raised part 52 of one floor cover 50, both of them are engaged and fastened to each other to cause the body cover 55 and the floor cover 50 to be cooperatively connected to each other. A central part 57 of the body cover 55 is made such that the right and left side walls 57a are raised and a substantial horizontal top wall 57b covers the top portion, a rear half part of the top wall 57b has a downward concaved upper opening concave part 57d, the upper opening concave part 57d forms a parallelpiped storing space and then the battery 39 is stored from above. A lower opening concave part 57e (its front side is also released to open) enclosed downwardly with the front wall 57f and the top wall 57b of the upper opening concave part 57d is integrally formed adjacent to the front side of the upper opening concave part 57d with the front wall 57f being applied as an interface. [0066] This lower opening concave part 57e is applied to the oil tank 38 from above which is arranged at a rear part of the fuel tank 37, wherein its top wall 57b is punched with a round opening 57c through which an oil feeding port 38a projected above the oil tank 38, and a flat cylindrical wall 57h constituting an oil accumulator around the round opening 57c at the upper surface of the top wall 57b. In addition, there is provided another round opening 57 i for an oil level gauge 38c (refer to Fig. 19) in adjacent to the left side of the flat cylindrical wall 57h. Further, the right and left sides of the aforesaid flat cylindrical wall 57h have punched slits 57 j and 57k. The oil tank 38 is a lateral long rectangular tank as shown in Figs. 18 and 19, wherein its upper wall is provided with an oil supplying port 38a, there are provided thick expanded projections 38d, 38e at the predetermined right and left positions, and the aforesaid oil level gauge 38c is installed at the left side of the left-side projection 38d. The lower wall of the oil tank 38 is provided with, at its left front side, the oil supplying port 38b. [0068] The lower wall of the oil tank 38 is supported, at its central part in a width direction, by the upper rear end 7e of the rear-frame 7 and the front slant part 29a of the rear sub-frame 29, in particular, from the lower wall front central part, it is divided into two right and left downward segments and a slightly opened fork-like engaging piece 38f is projected and the rear-frame 7 is punched with the slit 7i in correspondence with the fork-like engaging piece 38f. [0069] Accordingly, when the oil tank 38 is mounted on the upper rear end 7e of the rear-frame 7 and the front side slant part 29a of the rear sub-frame 29, the fork-like engaging piece 38f is fitted to the slit 7i of the rear-frame 7, the oil tank 38 is position set and also engaged. In addition, the fork-like engaging piece 38f fitted into the slit 7i bridges over from above a central rib 29c of the front side slant part 29a of the rear sub- frame 29 inserted into the rear-frame 7 (refer to Fig. 19). In this way, a lower opening concave part 57e of the body cover 55 is applied to cover from above the oil tank 55g supported at the upper rear end 7e of the rear- frame 7 and the front side slant part 29a of the sub-frame 29, the oil supplying port 38a passes through the round opening 55g and is projected upwardly, its right and left-side projections 38d, 38e are fitted to each of the slits 57 j, 57k and engaged there, thereby the oil tank 38 is fixed in the lower opening concave part 57e of the body cover . .{0071] A fixing part 571 at a front central part at a bottom wall of the upper opening concave part 57d storing a rear battery 39 while being spaced apart between the lower opening concave part 57e and the front wall 57f is partially formed to be concaved, • and its central part is formed with a fixing hole 57m. The fixing hole 571 is supported at a front end of the rear side horizontal part 29b of the rear sub-frame 29, the fixing hole 57m is coincided with a fixing hole 29f of the rear sub- frame 29, a bolt 63 is passed through it, a nut 64 is threadably fitted to the bolt and fastened (refer to Fig. 18). The right side of the top wall 57b formed with the upper opening concave part 57d is formed with a substantial rectangular opening 57n, and then each of the rearward position and its substantial symmetrical left-side position is provided with rectangular holes 57q, 57p, respectively. Although the battery 39 stored in the upper opening concave part 57 is covered by a battery cover 58 as shown in Fig. 20, the battery cover 98 is made of synthetic resin and this is formed into a flat box shape by a substantial rectangular top plate 98a corresponding to the upper opening concave part 57d and the side plates 98b having four sides extending downwardly . [0073]- The top plate 98a of the battery cover 98 has a slight concave central part/ the right side plate 98b is formed with a fuse holder 98c with its part being extended downwardly, and the fuse holder 98c is made such that the engaging part 98d projected at its lower end is engaged with the fuse 59 to hold the fuse 59. In addition, each of the engaging pieces 98e, 98f is projected and formed in a sideward direction at the right and left side plates 98b. When such a battery cover 98 as above is applied to cover above the battery 39 stored in the upper opening concave part 57d, as shown in Fig. 20, the fuse 59 held at the fuse holder 98c is inserted into the opening 57n arranged adjacent to the right side of the upper opening concave part 57d of the body cover 55, each of the right and the left engaging pieces 98e, 98f is inserted into each of the rectangular holes 57p, 57q and concurrently the engaging claws of the engaging pieces 98e, 98f are engaged with the side edges of the rectangular holes 57p, 57q and fitted there. The battery 39 stored in the upper opening concave part 57d is fixed with its upper surface being pressed by a central concave part of the top plate 98a of the battery cover 98. The rear wall of the upper opening concave part 57d has a rectangular opening 57r through which an electrical line passes. A rear adjoining end of the upper opening concave part 57d is formed with a rectangular opening 57s for a seat lock 111, the right and left lower positions of the rectangular opening 57s are provided with round holes 57t, 57u and I concurrently a fixing hole 58a is arranged at its rear part (refer to Figs. 6 and 7). As shown in Fig. 21, the aforesaid round holes 57t, 57u of the body cover 55 are fitted to the upper end cylindrical hubs 29h of the right and left raised supporting parts 29g of the aforesaid rear sub-frame 29, then rubber bushings 103 are fitted there, the body cover 55 is supported at the upper end of the raised supporting part 29g and at the same time the extremity end fixing part 102a of the carrier 102 is abutted against the top surface of the cylindrical hub part 29h projected out of the round holes 57t, 57u, a bolt 104 passing through the extremity end fixing part 102a is threadably engaged with the threaded hole 29i of the cylindrical hub part 29h and fastened there. [0078] In addition, as shown in Figs. 18 and 31, the fixing hole 58a of the rear part 58 of the body cover 55 is coincided with the hole 29k of the rear end 29 j of the rear sub-frame 29, a bolt 76 is inserted into the rear part fixing part 72b of the carrier 72, the shock absorbing rubber 75, the fixing hole 58a of the body cover 55 and the hole 29k of the rear end part 29j of the rear sub-frame 29, a nut 107 is threadably engaged with the extremity end of the bolt 106 and fastened there to enable the body cover 55 and the carrier 102 to be integrally fixed to the rear sub-frame 29. [0079] As described above, the body cover 55 is fixed and supported such that the fixing hole 57m, fixing hole 58a positioned in a forward and rearward direction and the right and left round holes 57t, 57u are coincided with the forward or rearward fixing holes 29f, 29k at the rear side horizontal part 29b of the rear sub-frame 29 and the threaded holes 29i of the right and left hubs 29h and threadably engaged and fastened to each other with bolts and nuts. [0080] In addition, a rear end of the body cover 55 is formed with a tail light fixing part 58b and a number plate bracket fixing part 58c, and each of the tail light 80 and the number plate bracket 81 is fixed there. A rear direction indicator 82 is integrally arranged with the tail light 80 and then a reflector 83 is supported at the number plate bracket 81 (refer to Fig.l). fOQ81] As described above, the body cover 55 is supported by the rear sub-frame 29 connected to the rear part of the rear-frame 7 so as to cover the circumferences of the rear-frame 7 and the rear sub-frame 29, the lower opening concave part 57e covers the oil tank 38 from above which is supported at the upper rear end 7e of the rear-frame 7 and at the front side slant part 29a of the rear sub-frame 29, the right and left projections 38d, 38e of the oil tank 38 are fitted to each of the slits 57 j, 57k and engaged there to cause the oil tank 38 to be positively fixed in the lower opening concave part 57e of the body cover 55. In addition, the oil tank 38 is constructed such that the fork-like engaging pieces 38f projected at the lower wall is fitted to and engaged with the slit 7i of the rear-frame 7 and supported there. Accordingly, the oil tank 38 does not require any special fixing member and fastening members such as a bolt or the like in the case that the oil tank is assembled, its number of component elements can be reduced and their assembling work can be facilitated. [0003] The body cover 55 is made such that the upper opening concave part 57d storing the battery 39 at a rear part with the aforesaid lower opening concave part 57e and the front wall 57f being spaced apart is integrally formed there, so that it is not necessary to constitute the battery box with another material, a die for the work is not required, an investment for a die can be reduced, its number of component parts can be reduced and the assembling work can be facilitated. Since the lower opening concave part 57e and the upper opening concave part 57d are formed in forward and rearward directions with the front wall 57f being applied in common, a shape of the body cover 55 is simplified and at the same time the oil tank 38 and the battery 39 can be efficiently arranged at the rear part of the fuel tank 37. In addition, referring to Figs.l to 3, Figs. 6 to 8 and Figs. 13 to 35, the rear fender fixing structure will be illustrated and described. The items already described will be eliminated for their repetitive description. Further, a forward gusset 8 is abutted against an upper surface of the horizontal rear part 6b of the down-frame 6 located more forwardly than the abutting part between the down-frame 6 and the rear-frame 7 and against the forward surface of a raising part 7b of the rear-frame 7 located more upwardly than the abutting part between the down-frame 6 and the rear-frame 7, as shown in Fig. 2, both side edges of the aforesaid abutting part are integrally coupled by a welding, as shown in Fig. 24, and the coupling part between the down-frame 6 and the rear- frame 7 is supplemented and reinforced by the forward gusset 8. [OOB6j Additionally, as shown in Fig. 2, the upper part 7c than the raising part 7b of the rear-frame 7 is gradually curved in a rearward direction, and as shown in Fig. 25, a rearward gusset 9 is abutted against a rear surface of the curved part 7c and both side surfaces, both side edges of the abutting part are integrally coupled to each other by welding, and the curved part 7c of the rear-frame 7 is supplemented and reinforced by the rearward gusset 8. [0087] In addition, to the rear end of a lower part rearward extending part 7d extending in a rearward direction from the forward lower part 7a of the rear-frame 7 is integrally coupled a main stand bracket 10 having a substantial Z-shaped section on by a welding, the main stand 11 is pivotally arranged at the main stand bracket 10 through a pivot shaft 12, and then a tension coil spring 13 is installed in tension between a spring receptacle lOd of the main stand bracket 10 and a spring receptacle lid of the main stand 11. Further, as shown in Fig.6, a hanger sleeve 14 is passed through both right and left side surfaces of the raising part 7b of the rear-frame 7 and both right and of the forward gusset 8, welding is applied to both right and left side surfaces of the raising part 7b of the rear-frame 7, the hanger sleeve 14 and the fitted part, the hanger sleeve 14 is integrally fixed to the rear-frame 7, and as shown in Fig.l, extremity ends of a pair of right and left hanger links 16 are integrally installed at both ends of the hanger pin 15 fitted to the hanger sleeve 14. [0089] Further, additionally, in Figs.23 and 28 is illustrated in detail a structure in which each of a shock absorber supporting shaft 19 and an ignition coil fixing stay 20 is integrally installed by welding at both right and left surfaces of the upper rear end 7e of the upper part 7c of the rear frame 7. [0090] In this way, as shown in Fig.22, the upper rear end p 7e of the rear-frame 7 is recessed to be along a forward or rearward horizontal direction of the vehicle body, in other words, in a slant direction against a longitudinal direction of the upper rear end part 7e of the rear-frame 7 inclined in a slant upward direction, further as shown in Figs.22 and 32, a front end 29a (forward slant part) of a rear sub-frame 29 made of casted aluminum is inserted from the rear end opening of the upper rear end 7e of the rear-frame 7 toward a forward deep part and as described below, a front end 36a of the rear sub-frame 29 and a rear tank bracket 37b are integrally fixed to the upper rear end 7e of the rear-frame 7. [0091] The rear sub-frame 29 is formed as shown in Figs. 13 to 17, a bolt 40 is inserted into each of holes 29d and a recess 29p arranged at the forward end 36a (as shown in Figs.18 and 14, the holes 29d are formed at both sides of the rear sub-frame 36 and a central rib 29c, and the recess 29p is formed at a thin walled part 29r), a side hole 7g at an upper rear end 7e of the rear-frame 7 and side holes 37d of both end pieces 37c of the rear tank bracket 37b integrally coupled to the lower t rear end of the fuel tank 37, a nut (not shown) is thredably and forcedly fastened to the extremity end of the bolt 60, as shown in Figs.3, 16 and 18, bolts 61 are inserted into a bottom hole 7h of the upper rear end 7e of the rear-frame 7 and an upward or downward hole 29e of the front end 29a of the sub-frame 29 (right and left two sets of both holes 7h and 29e are present), a nut 62 is threadably fitted and fastened to the extremity end of each of the bolts 61, resulting in that the front end 29a of the rear sub-frame 29 is integrally fixed to the upper rear end 7e of the rear-frame 7. [0092] In addition, as shown in Figs.l and 25, the forward tank bracket 37a is integrally coupled to a downward front part of the fuel tank 37 by welding, and as shown in Figs.2 and 25, a tank fixing sleeve 7f directed in a width direction of the vehicle body is integrally coupled to the upper surface of the upper part 7c of the rear-frame 7 by welding, a bolt 108 is inserted into each of side holes 37f of both pieces 37e of the forward tank bracket 37a and a tank fixing sleeve 7f, a nut 109 is threadably fitted to and fastened to the extremity end of the bolt 108, and further it is coupled to the upper rear end 7e of the rear-frame 7 with the rear tank bracket 37b, resulting in that the fuel tank 37 is integrally fixed to the rear-frame 7. [0093] Then, a fixing structure of the rear-fender 65 made of synthetic resin (see Fig.22) will be described. The rear-fender 65 is formed into a shape as shown in Figs.26 to 30, a forward left side 65c of the rear-fender 65 is formed with an engaging piece 65a capable of being engaged with the upper part of the shock absorbing unit supporting shaft 19 from a forward part, the forward right side surface 65d of the rear-fender 65 is formed with a downward curved concave part 65e, its left side is formed with a recess 65f, the rear-fender 65 is abutted against the lower surface of the upper rear end 7e of the rear-frame 7 from lower part from the upper rear end 7e of the rear-frame 7, and as shown in Fig.28, the recess 65f of the rear-fender 65 is engaged with an extremity end 20a of the ignition coil fixing stay 20, thereafter, an engaging piece 65a of the rear-fender 65 is engaged with the shock absorbing unit supporting shaft 19, resulting in that the forward part of the rear-fender 65 can be fixed to the rear-frame 7. [0094-] As shown in Fig.30, a rear central part of the rear-fender 65 is curved upwardly to form an abutting part 65b, a hole 65g is formed in the abutting part 65b. As shown in Fig.31, the abutting part 65b of the rear-fender 65 is abutted against the lower surface of a rear concave part 29r of the sub-frame 29, a bolt 47 is inserted into a hole 291 of the rear concave part 29r of the sub-frame 29 and a hole 65g of the abutting part 65b of the rear-fender 65, a nut 48 is threadably fitted to and fastened to the extremity end of the bolt, thereby a rear part of the rear fender 65 can be integrally coupled to the sub-frame 29. A fixing structure of the body cover 55 made of synthetic resin in respect to the rear sub-frame 29 has already been described, and its detailed structure is shown in Figs.31 to 34. [0096] Then, a lock mechanism for the seat 40 will be described. The seat 40 is pivotally arranged at the extremity end of the fuel tank 37 in such a way that the seat can be oscillated in an upward or a downward direction. As shown in Fig.33, a U-shaped engaging member 110 is integrally arranged at the rear end of the seat 61 in a downward direction, and as shown in Figs.31 and 33, a seat lock 111 to which an engaging claw Ilia which can be engaged with the U-shaped engaging member 110 is installed in the sub-frame 29. That is, holes lllc are formed across a base part 1l1b of the seat lock 111. Holes 29s are formed inwardly across a left raised supporting part 29g at the sub-frame 29. Bolts 112 are passed in the holes 29s, lllc from the lower part to the upper part and nuts 113 are threadably fitted to and fastened to their extremity ends. As shown in Fig.33, the left side raised part 29g and the left side wall of the body cover 55 are formed with round holes 29q, 57v in such a way that a key insertion part 111d of the seat lock 111 may be exposed toward a side part. Further, as shown in Fig. 27, an ignition coil 114 is installed at the ignition coil fixing stay 20, and as shown in Figs. 2 7 and 31, a bolt 68 is inserted into a hole 29m located at a more rearward location than the upper end cylindrical part 29h and a hole 115a of a regulator 115a, a nut 69 is threadably fitted to and fastened to the extremity end of the bolt 68. As shown in Figs. 27, 31, 34 and 35, a hole 116b of a fixing leg 116a of a register 116 is abutted against a lower recess 29n at a more rearward right side than the hole 29m of the sub-frame 29. A bolt 117 is inserted into these recess 29n and hole 116b, and a nut 118 is threadably fitted to and fastened to the extremity end of the bolt 117. ••{ 0098 ]* In addition, an anti-theft U-shaped lock engaging hook 119 is integrally fixed to one side surface of the lower rear extending part 7d of the rear-frame 7 by welding and the like. [0099] . In the preferred embodiment 3, as described above, the rear-frame 7 of the main frame is constructed by a hollow member having a large sectional size, resulting in that a large reaction force applied from the rear wheel 4 to the shock absorbing unit supporting shaft 19 through the shock absorbing unit 26 can be positively borne by the rear-frame 7. [0100] The rear sub-frame 29 made of aluminum is inserted into the hollow rear- frame and fixed by the bolts 60, 61 and the nut 62 at two forward or rearward locations (accurately three locations), thereby the rear sub-frame 29 can be forcedly coupled to the rear- frame 7. Further, since the rear sub-frame 29 is made of cast aluminum, its weight is light and it is easy to form its shape into one which is suitable for fixing the component parts such as rear-fender 65, body cover 55, carrier 102, seat lock 111, regulator 115 and register 116 or the like and further its small-size and cost-down can be realized by reducing the fixing parts . In addition, since the carrier 102 is installed at the sub-frame 29 together with the body cover 55, it is possible to reduce the number of fixing component elements such as body cover 55 and carrier 102 and also the number of assembling steps and to make a cost-down of them. [0103] Further, since the fixing of the rear part of the fuel tank 37 against the upper rear end 7e of the rear-frame 7 is carried out in concurrent with the front end 29a of the sub-frame 29, it is also possible to reduce the number of component parts and the number of assembling steps. i Further, since the sub-frame 29 is made of aluminum, its surface treatment is not needed and in addition/ a thermal radiation characteristic of the electrical component parts such as the regulator 115 and the register 116 or the like is improved. [Description of the Reference Symbols] 1: scooter type motorcycle 2: vehicle body frame 3: front wheel 4: rear wheel 5: head pipe 6: down- frame 7: rear-frame 8: forward gusset 9: rearward gusset 10: main stand bracket 11: main stand 12: pivot shaft 13: tension coil spring 14: hanger sleeve 15: hanger pin 16: hanger link 17: fixing pin 18: bracket 19: shock absorbing unit supporting shaft 20: ignition coil fixing stay member 21: power unit 22: internal combustion engine 23: V-belt continuously variable transmission 24: gear reducer 25: fixing shaft 26: shock absorbing unit 27: floor pipe 28: floor bracket 29: rear sub-frame 30: steering shaft 31: steering handle 32: front fork 33: air cleaner 34: carburetor 35: exhaust pipe 36: muffler 37: fuel tank 38: oil tank 39: battery 40: seat 41: front-fender 42: leg shield 44: center cover 47: bolt 48: nut 50: floor cover 51: horizontal plate 52: raised part 55: body cover 56: cover front part 57: cover middle part 58: cover rear part 59: fuse 60,61: bolt 62: nut 63: bolt 64: nut 65: rear-fender 68: bolt 69: nut 70: screw 71: washer 72, 73: bolt 74: screw 75: washer 80: tail light 81: number plate bracket 82: rear direction indicator 83: side reflector 98: battery cover 102: carrier 103: bushing 104: bolt 105: shock absorbing rubber 106: bolt 107: nut 108: bolt 109: nut 110: U-shaped engaging member 111: seat lock 112: bolt 113: nut 114: ignition coil 115: regulator 116: register 117: nut 118: nut 119: anti-theft U-shaped engaging hook We Claim: 1. A cover structure of vehicle, wherein a low floor is arranged at a forward or rearward central part of the vehicle, a vehicle frame (2) at the rear part of said floor is raised in a rearward direction characterized in that a floor cover (50) constituting said floor is raised rearwardly at its rear part to cover a lower front part, right and left sides of the raised part of said vehicle frame, the rear part upper end of said floor cover is cooperatively coupled to the front part lower end of the body cover (55) entirely covering a circumference of the vehicle body frame at a rear part of said floor, and a connected part between said floor cover and the body cover is positioned at a higher location than an exhaust pipe (35) fixing part of thepower unit. 2. A cover structure as claimed in claim 1 wherein the connection between said floor cover and the body cover is made such that the fixing part of said floor cover is overlapped outside the fixing part of said body cover and fastened to it. 3. A cover structure as claimed in claim 2 wherein the connection between said floor cover and the body cover is made such that engaging claws (55b) are provided at one of them, and engaging holes are provided at the other and both them are engaged and connected to each other. 4. A cover structure as claimed in claim 1 wherein said vehicle frames is provided with a fuel tank (37) and support said fuel tank (37) and an oil tank (38) covered by an openable or closable seat (40), circumferences of said vehicle frames are integrally covered by the body cover over (55) over their forward or rearward directions, said body cover (55) has integrally a lower opening concave part covering from above said oil tank and an upper opening concave part and a top wall of said lower opening concave part is punched with an upper opening passing and projected above an oil supplying port (38a) of said oil tank. 5. A cover structure as claimed in claim 4 wherein said lower opening concave part and said upper opening concave part are arranged at a rear part of said fuel tank. 6. A cover structure as claimed in claim 4 or claim 5 wherein said lower opening concave part and said upper opening concave part have a front common wall and integrally formed to be adjacent to each other. 7. A cover structure as claimed in claim 6 wherein said lower opening concave part and said upper opening concave part are arranged in a forward or a rearward direction. 8. A cover structure as claimed in anyone of claims 4 to 7 wherein projections (38d, 38e) formed at an upper wall of said oil tank are fitted to slits (55j, 55k) formed at predetermined positions of the top wall of the lower opening concave part of said body cover and engaged there. 9. A cover structure as claimed in anyone of claims 4 to 8 wherein projections (38f) formed at a lower wall of said oil tank are fitted to slits (71) formed at predetermined positions of said vehicle frames and engaged there. 10. A cover structure of a vehicle substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.

Documents:

687-del-1997-abstract.pdf

687-del-1997-claims.pdf

687-del-1997-correspondence-others.pdf

687-del-1997-correspondence-po.pdf

687-del-1997-description (complete).pdf

687-del-1997-drawings.pdf

687-del-1997-form-1.pdf

687-del-1997-form-13.pdf

687-del-1997-form-19.pdf

687-del-1997-form-2.pdf

687-del-1997-form-3.pdf

687-del-1997-form-4.pdf

687-del-1997-form-6.pdf

687-del-1997-gpa.pdf

687-del-1997-petition-137.pdf

687-del-1997-petition-138.pdf

abstract.jpg