Indian Patents. 269904:AN APPARATUS FOR SMOOTHLY ENGAGING AND DISENGAGING A CLUTCH ASSEMBLY

Title of Invention	AN APPARATUS FOR SMOOTHLY ENGAGING AND DISENGAGING A CLUTCH ASSEMBLY
Abstract	A transmission system is disclosed for vehicles particularly two- wheelers. A transmission system reduces judder and rattle. It involves the use of a push rod, ball and recess cup provided within the clutch assembly. The use of a wavy spring in the friction stack subassembly is also suggested.

Full Text	FORM-2 THE PATENTS ACT, 1970 (39 of 1970) & THE PATENTS RULES, 2003 PROVISIONAL Specification (See section 10 and rule 13) TRANSMISSION SYSTEMS HIGHTECHNOLOGY TRANSMISSION (I) PVT. LTD. an Indian Company of K-226, MIDC WALUJ, AURANGABAD 431 136, MAHARASHTRA, INDIA THE FOLLOWING SPECIFICATION DESCRIBES THE INVENTION. This invention relates to transmission systems. In particular, this invention transmission system for vehicles and like devices where torque is transmitted from an engine to a drive wheel. Still particularly, this invention relates to transmission systems which include a clutch and the invention is directed to attenuating if not eliminating judder and rattling vibrations during transmission of torque via the transmission system. Judder & rattling problems of clutch are commonly known phenomenon. Judder is described as the vibrations perceived normally at the vehicle takeoff time & rattling is the noise generated in transmission elements. Both these phenomena are observed in a partially engaged CLUTCH condition. The basic reason for these phenomena is that there is a fluctuation of the torque in the process of transmission from the clutch to the gear box. The source of problem is the mutual matching or mismatching of components leading to the problem of Judder/Rattling . No individual component (in clutch or out of clutch) is fully responsible. Both judder and rattling are the accumulated effect of "errors (Geometric Tolerances allowed on every individual component)" in the assembly of all the parts. 2 The parts are assembled in random orientation about the shaft axis. Therefore, in vehicle assembly the approach results in maximization of error accumulation leading to misalignment of Clutch and its Actuation links. Because of the design of clutch actuating links in the prior art, this misalignment leads to reciprocation of clutch pressure plate in axial direction, which causes clamp load to fluctuate in a partially engaged condition. This is the cause of torque fluctuation & ultimately the Judder/Rattling phenomena. Several attempts have been made to tackle this phenomena in the prior art and several patents/patent applications are directed to remove judder and rattling vibrations. For instance, US patent applications 20040260444 and 20050189192 disclose methods of reducing these vibrations. Similarly, Japanese application numbers 59-048478 and 55-182828 also disclose mechanisms and devices for preventing judder and controlling torque vibration. All these attempts are impractical and extremely complicated. There was therefore a need for a simple inexpensive, relatively simple method for attenuating judder and rattling in transmission systems. This invention envisages a flexible joint introduced for push type clutch actuation links adapted to absorb misalignment. This invention also envisages the use of a novel washer to improve clutch alignment. A particular feature of this invention is the use of a wavy flexible washer as a transmission element to improve clutch alignment. 3 The invention will now be described with reference to the accompanying drawings, in which Figure 1 is a blown up schematic view of a transmission system in accordance with this invention. Figure 1[ a ] is an enlarged view of the wavy washer; and Figure 1 [b] is an enlarged view of the ball plate and ball fitted in the transmission system. Referring to the drawings, the power generated by an engine is transmitted to the gear box in the following sequence. The engine rotates the Gear(2) in figure 1 which is part of the clutch box assembly, which comprises Housing (1) , Gear(2), Bush(3), Plain Washer(4), Washer conical(5), Springs (6,7,8), Plate clutch Retaining(9) & Rivet(l0). This in turn rotates the clutch box assembly, which further rotates the Friction Stack Subassembly comprising Clutch centre (11), Plate Clutch Pressure(12), Friction plates(13,14), Plate clutch (15), Wavy Washer (16), Holder Clutch(17), Spring Clutch(18), Bolts (19), Ball Plate (20) & Ball(21). This Stack Subassembly rotates the gearbox input shaft via the splines of the Clutch Centre(l 1) when the clutch is engaged. When the clutch is disengaged by pushing the Holder Clutch (17) by Ball Plate(20) & Ball(21) there is separation created between disc clutch friction(13,14) and Plate Clutch(15) which stops the Power transmission i.e. rotation. 4 When the clutch is engaged the reverse operation takes place with the difference that initially Wavy Washer(16) allows gradual engagement against the springs (18). While considerable emphasis has been placed herein on the specific structure of the preferred embodiment, it will be appreciated that many alterations can be made and that many modifications can be made in the preferred embodiment without departing from the principles of the invention. These and other changes in the preferred embodiment as well as other embodiments of the invention will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation. Dated this 21st day of July 2006. 5

Full Text

FORM-2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
PROVISIONAL
Specification
(See section 10 and rule 13)
TRANSMISSION SYSTEMS
HIGHTECHNOLOGY TRANSMISSION (I) PVT. LTD.
an Indian Company
of K-226, MIDC WALUJ, AURANGABAD 431 136,
MAHARASHTRA, INDIA
THE FOLLOWING SPECIFICATION DESCRIBES THE INVENTION.

This invention relates to transmission systems.
In particular, this invention transmission system for vehicles and like devices where torque is transmitted from an engine to a drive wheel.
Still particularly, this invention relates to transmission systems which include a clutch and the invention is directed to attenuating if not eliminating judder and rattling vibrations during transmission of torque via the transmission system.
Judder & rattling problems of clutch are commonly known phenomenon.
Judder is described as the vibrations perceived normally at the vehicle takeoff time & rattling is the noise generated in transmission elements. Both these phenomena are observed in a partially engaged CLUTCH condition.
The basic reason for these phenomena is that there is a fluctuation of the torque in the process of transmission from the clutch to the gear box. The source of problem is the mutual matching or mismatching of components leading to the problem of Judder/Rattling .
No individual component (in clutch or out of clutch) is fully responsible. Both judder and rattling are the accumulated effect of "errors (Geometric Tolerances allowed on every individual component)" in the assembly of all the parts.
2

The parts are assembled in random orientation about the shaft axis. Therefore, in vehicle assembly the approach results in maximization of error accumulation leading to misalignment of Clutch and its Actuation links.
Because of the design of clutch actuating links in the prior art, this misalignment leads to reciprocation of clutch pressure plate in axial direction, which causes clamp load to fluctuate in a partially engaged condition. This is the cause of torque fluctuation & ultimately the Judder/Rattling phenomena.
Several attempts have been made to tackle this phenomena in the prior art and several patents/patent applications are directed to remove judder and rattling vibrations. For instance, US patent applications 20040260444 and 20050189192 disclose methods of reducing these vibrations. Similarly, Japanese application numbers 59-048478 and 55-182828 also disclose mechanisms and devices for preventing judder and controlling torque vibration. All these attempts are impractical and extremely complicated. There was therefore a need for a simple inexpensive, relatively simple method for attenuating judder and rattling in transmission systems.
This invention envisages a flexible joint introduced for push type clutch actuation links adapted to absorb misalignment. This invention also envisages the use of a novel washer to improve clutch alignment.
A particular feature of this invention is the use of a wavy flexible washer as a transmission element to improve clutch alignment.
3

The invention will now be described with reference to the accompanying
drawings, in which
Figure 1 is a blown up schematic view of a transmission system in
accordance with this invention.
Figure 1[ a ] is an enlarged view of the wavy washer; and
Figure 1 [b] is an enlarged view of the ball plate and ball fitted in the
transmission system.
Referring to the drawings, the power generated by an engine is transmitted to the gear box in the following sequence. The engine rotates the Gear(2) in figure 1 which is part of the clutch box assembly, which comprises Housing (1) , Gear(2), Bush(3), Plain Washer(4), Washer conical(5), Springs (6,7,8), Plate clutch Retaining(9) & Rivet(l0). This in turn rotates the clutch box assembly, which further rotates the Friction Stack Subassembly comprising Clutch centre (11), Plate Clutch Pressure(12), Friction plates(13,14), Plate clutch (15), Wavy Washer (16), Holder Clutch(17), Spring Clutch(18), Bolts (19), Ball Plate (20) & Ball(21). This Stack Subassembly rotates the gearbox input shaft via the splines of the Clutch Centre(l 1) when the clutch is engaged.
When the clutch is disengaged by pushing the Holder Clutch (17) by Ball Plate(20) & Ball(21) there is separation created between disc clutch friction(13,14) and Plate Clutch(15) which stops the Power transmission i.e. rotation.
4

When the clutch is engaged the reverse operation takes place with the difference that initially Wavy Washer(16) allows gradual engagement against the springs (18).
While considerable emphasis has been placed herein on the specific structure of the preferred embodiment, it will be appreciated that many alterations can be made and that many modifications can be made in the preferred embodiment without departing from the principles of the invention. These and other changes in the preferred embodiment as well as other embodiments of the invention will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.
Dated this 21st day of July 2006.

5

Documents:

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Patent Number

269904

Indian Patent Application Number

1167/MUM/2006

PG Journal Number

47/2015

Publication Date

20-Nov-2015

Grant Date

18-Nov-2015

Date of Filing

21-Jul-2006

Name of Patentee

ENDURANCE TECHNOLOGIES PRIVATE LIMITED

Applicant Address

K-226, MIDC WALUJ, AURANGABAD, 431136,

Inventors:

#	Inventor's Name	Inventor's Address
1	GEHANEY RAMESH	K-226, MIDC WALUJ, AURANGABAD, 431136.
2	GUPTA PRAVEEN KUMAR	K-226,MIDC WALUJ,AURANGABAD, 431136.
3	JAHAGIRDAR ASHUTOSH	K-226,MIDC WALUJ,AURANGABAD, 431136.
4	DESHPANDE SANJAY	K-226,MIDC WALUJ,AURANGABAD, 431136.

PCT International Classification Number

B06K17/34

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA