Title of Invention	A DRIVE MECHANISM FOR A MOTOR CYCLE
Abstract	A drive mechanism for a motor cycle comprises a wheel hub and sprocket hub freely mounted on the axle shaft, said sprocket hub having a plurality of drive lugs, said lugs engaging with slots in a cushion, said cushion being placed within pockets in the wheel hub a sprocket wheel mounted on the sprocket hub by a one way clutch allowing transm ission of power in one direction, but not in the other, such that power is transmitted to the wheel hub through the cushion pocket in the forward drive direction, and no power is transm itted in the other direction, during torque reversal, when the one way clutch slips.

Title of Invention

A DRIVE MECHANISM FOR A MOTOR CYCLE

Abstract

A drive mechanism for a motor cycle comprises a wheel hub and sprocket hub freely mounted on the axle shaft, said sprocket hub having a plurality of drive lugs, said lugs engaging with slots in a cushion, said cushion being placed within pockets in the wheel hub a sprocket wheel mounted on the sprocket hub by a one way clutch allowing transm ission of power in one direction, but not in the other, such that power is transmitted to the wheel hub through the cushion pocket in the forward drive direction, and no power is transm itted in the other direction, during torque reversal, when the one way clutch slips.

Full Text	This invention relates to a drive mechanism for a motor cycle. The term "motor cycle" in this specification means and includes a two wheeler motor vehicle or any other motor vehicle to which this invention is applicable. The present invention relates to drive mechanism for the driven wheel of a two wheeler motor vehicle which allows power flow from engine to the driven wheel in the drive direction but prevents reverse flow of power from the driven wheel to the engine. Power from the engine to the driven wheel of a motor cycle is taken by several means such as chain and sprocket drives, gear driven shafts, belt drives and so on. hi the known drive systems, the drive member becomes an mtegral part of the of the wheel assembly rotating along with the driven wheel Fig. 1 shows a typical rear wheel of a motor cycle driven by the engine. Here the sprocket driven by the chain from the transmission is mounted rigidly with respect to the rear wheel. Fig.2 of the drawings illustrates a typical wheel assembly of a two wheeler. The wheel hub 1 is mounted on the axle shaft 2 by means such as bearings 3 allowing free rotation about the axle shaft 2. The sprocket hub 4 is mounted on the axle shaft 2 by means such as the bearing 5 allowing free rotation about the axle shaft 2. The sprocket hub 4 has a plurality of drive lugs 4A. The cushion 6is placed within pockets lA available in the wheel hub 1. The sprocket wheel 7 is rigidly mounted to the sprocket hub 4 using means such as bolts 8. The power from the engine drives the sprocket wheel 7 which in turn drives the sprocket hub 4. The drive lug 4A compresses the cushion 6 in the drive direction to a preset value, before transmitting power to the wheel hub 1 through the cushion pocket lA. hi the known drive mechanisms for motor cycles, the major disadvantage is that the engine and the road wheel or driven wheel are coupled such that there is power flow from the engine to the road wheel, during normal operation; and from the road wheel to the engine, for instance, during coasting although the throttle is OFF. This increases the ftiel consumption of the vehicle. Also, the lorque reversals cause reduced lite of the drive train components through out transmission. Thus ihis invention allows torque flow from engine to wheel in tlie drive direction, but prevents reverse flow of torque from wheel to engine. The drive mechanism for a motor cycle, according to this invention, comprises a wheel hub and sprocket hub freely mounted on the axle shaft, characterised in that said sprocket hub has a plurality of drive lugs, said lugs engaging with slots in a cushion, said cushion being placed within pockets in the wheel hub", a sprocket wheel mounted on the sprocket hub by a one way clutch allowing transmission of power in one direction , but not in the other, such that power is transmitted to the wheel hub through the cushion pocket in the forward drive direction, and no power is transmitted in the other direction, during torque reversal, when the one way clutch slips. This invention witt now be described with reference to the accompanying drawings which illustrate in Fig. 1 a typical rear wheel of a m otor cycle driven by the engine Fig.2 a typical wheel assembly of a two wheeler Fig.3 asectional elevation of an embodiment of this invention by way of example and not by way of limitation The embodiment will be seen to comprise a wheel hub 11 freely mounted on an axle shaft 21 by means such as bearings, thus allowing free rotation of the wheel hub about the shaft 21. The sprocket bub 41 is also freely mounted on the shaft 21 by means such as bearings 51, thus allowing free rotation of &e axial shaft 21. The sprocket hub 41 has a plurality of drive lugs 41A as ao integral part thereof. The drive lugs 41A engage with the slots 61A provided for the cushion 61. The said cushion is placed within the pockets IIA provided in the wheel hub U. The sprocket wheel 71 is mounted on the sprocket hub 41 by means of the one way clutch 81 which permits power flow in the forward drive direction but slips in the opposite direction. Thus, the power from the engine drives the sprocket wheel 71, which in turn drives the sprocket hub 41. The drive lug 41A compresses the cushion 61, in the drive direction to a preset value, before transmitting power to the wheel hub 11 fltrongh the cushion pocket llA. During torque reversals, the one way clutch 81 slips preventing power flow from sprocket hub 41 to sprocket wheel 71 and thus prevents the wheel from driving the engine even when the throttle is OFF, thereby increasing fuel economy and the liie of the drive train components. From the foregoing description, it will be appreciated &at the drive mechanism proposed herein is not confmed to the embodiment herein described and illustrated but that various other embodiments are possible without departing from the scope and ambit of this invention. 1. A drive mechanism for a motor comprising a wheel hub and sprocket hub freely mounted on the axle shaft, characterised in that said sprocket hub has a plurality of drive said lug=, engaging with slots in a cushion, said cushion being placed within pockets in the wheel hub; a sprocket wheel mounted on the sprocket bob by a one way clutch allowing transmission of power in one direction , bum not in the other, such that power is transmitted to the wheel hub through the colon pocket in the forward drive direction, and no power is transmitted in the other direction, during torque reversal, when the one way clutch slips. 2. A drive mechanism for a motor cycle substantial" as herein described with reference to. and as illustrated in, the accompanying drawings.

Full Text

This invention relates to a drive mechanism for a motor cycle. The term "motor cycle" in this specification means and includes a two wheeler motor vehicle or any other motor vehicle to which this invention is applicable.
The present invention relates to drive mechanism for the driven wheel of a two wheeler motor vehicle which allows power flow from engine to the driven wheel in the drive direction but prevents reverse flow of power from the driven wheel to the engine.
Power from the engine to the driven wheel of a motor cycle is taken by several means such as chain and sprocket drives, gear driven shafts, belt drives and so on. hi the known drive systems, the drive member becomes an mtegral part of the of the wheel assembly rotating along with the driven wheel Fig. 1 shows a typical rear wheel of a motor cycle driven by the engine. Here the sprocket driven by the chain from the transmission is mounted rigidly with respect to the rear wheel.

Fig.2 of the drawings illustrates a typical wheel assembly of a two wheeler. The wheel hub 1 is mounted on the axle shaft 2 by means such as bearings 3 allowing free rotation about the axle shaft 2. The sprocket hub 4 is mounted on the axle shaft 2 by means such as the bearing 5 allowing free rotation about the axle shaft 2. The sprocket hub 4 has a plurality of drive lugs 4A. The cushion 6is placed within pockets lA available in the wheel hub 1. The sprocket wheel 7 is rigidly mounted to the sprocket hub 4 using means such as bolts 8. The power from the engine drives the sprocket wheel 7 which in turn drives the sprocket hub 4. The drive lug 4A compresses the cushion 6 in the drive direction to a preset value, before transmitting power to the wheel hub 1 through the cushion pocket lA.
hi the known drive mechanisms for motor cycles, the major disadvantage is that the engine and the road wheel or driven wheel are coupled such that there is power flow from the engine to the road wheel, during normal operation; and from the road wheel to the engine, for instance, during coasting although the

throttle is OFF. This increases the ftiel consumption of the vehicle. Also, the lorque reversals cause reduced lite of the drive train components through out transmission.
Thus ihis invention allows torque flow from engine to wheel in tlie drive direction, but prevents reverse flow of torque from wheel to engine.
The drive mechanism for a motor cycle, according to this invention, comprises a wheel hub and sprocket hub freely mounted on the axle shaft, characterised in that said sprocket hub has a plurality of drive lugs, said lugs engaging with slots in a cushion, said cushion being placed within pockets in the wheel hub", a sprocket wheel mounted on the sprocket hub by a one way clutch allowing transmission of power in one direction , but not in the other, such that power is transmitted to the wheel hub through the cushion pocket in the forward drive direction, and no power is transmitted in the other direction, during torque reversal, when the one way clutch slips.

This invention witt now be described with reference to the
accompanying drawings which illustrate in
Fig. 1 a typical rear wheel of a m otor cycle driven by the engine
Fig.2 a typical wheel assembly of a two wheeler
Fig.3 asectional elevation of an embodiment of this invention
by way of example and not by way of limitation
The embodiment will be seen to comprise a wheel hub 11 freely mounted on an axle shaft 21 by means such as bearings, thus allowing free rotation of the wheel hub about the shaft 21.
The sprocket bub 41 is also freely mounted on the shaft 21 by means such as bearings 51, thus allowing free rotation of &e axial shaft 21.

The sprocket hub 41 has a plurality of drive lugs 41A as ao integral part thereof.
The drive lugs 41A engage with the slots 61A provided for the cushion 61. The said cushion is placed within the pockets IIA provided in the wheel hub U.
The sprocket wheel 71 is mounted on the sprocket hub 41 by means of the one way clutch 81 which permits power flow in the forward drive direction but slips in the opposite direction.
Thus, the power from the engine drives the sprocket wheel 71, which in turn drives the sprocket hub 41. The drive lug 41A compresses the cushion 61, in the drive direction to a preset value, before transmitting power to the wheel hub 11 fltrongh the cushion pocket llA.
During torque reversals, the one way clutch 81 slips preventing power flow from sprocket hub 41 to sprocket wheel 71 and thus prevents the wheel from driving the engine even when the

throttle is OFF, thereby increasing fuel economy and the liie of the drive train components.
From the foregoing description, it will be appreciated &at the drive mechanism proposed herein is not confmed to the embodiment herein described and illustrated but that various other embodiments are possible without departing from the scope and ambit of this invention.

1. A drive mechanism for a motor comprising a wheel hub and
sprocket hub freely mounted on the axle shaft, characterised in that
said sprocket hub has a plurality of drive said lug=, engaging
with slots in a cushion, said cushion being placed within pockets
in the wheel hub; a sprocket wheel mounted on the sprocket bob by a one way clutch allowing transmission of power in one direction , bum not in the other, such that power is transmitted to the wheel hub through the colon pocket in the forward drive direction, and no power is transmitted in the other direction, during torque reversal, when the one way clutch slips.
2. A drive mechanism for a motor cycle substantial" as herein
described with reference to. and as illustrated in, the accompanying
drawings.

Documents:

1359-che-2004 abstract duplicate.pdf

1359-che-2004 abstract.pdf

1359-che-2004 claims duplicate.pdf

1359-che-2004 claims.pdf

1359-che-2004 correspondence-others.pdf

1359-che-2004 correspondence-po.pdf

1359-che-2004 description (complete) duplicate.pdf

1359-che-2004 description (complete).pdf

1359-che-2004 drawings duplicate.pdf

1359-che-2004 drawings.pdf

1359-che-2004 form-1.pdf

1359-che-2004 form-19.pdf

1359-che-2004 form-26.pdf

1359-che-2004 others.pdf

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Patent Number

217234

Indian Patent Application Number

1359/CHE/2004

PG Journal Number

21/2008

Publication Date

23-May-2008

Grant Date

26-Mar-2008

Date of Filing

13-Dec-2004

Name of Patentee

TVS MOTOR COMPANY LIMITED

Applicant Address

JAYALAKSHMI ESTATES, NO. 8, HADDOWS ROAD, CHENNAI - 600 006,

Inventors:

#	Inventor's Name	Inventor's Address
1	JABEZ DHINAGAR S	JAYALAKSHMI ESTATES, NO. 8, HADDOWS ROAD, CHENNAI - 600 006,
2	MOHAN GANGADURAI	JAYALAKSHMI ESTATES, NO. 8, HADDOWS ROAD, CHENNAI - 600 006,

PCT International Classification Number

B60K 41/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA