Description:FORM 2
The Patent Act 1970
(39 of 1970)
and
The Patent Rules, 2005

COMPLETE SPECIFICATION
(See Section 10 and Rule 13)

TITLE OF THE INVENTION
“MULTI-PLATE CLUTCH ASSEMBLY FOR A TWO WHEELED VEHICLE”

Endurance Technologies Limited
E-92, M.I.D.C. Industrial Area, Waluj,
Chh. Sambhajinagar – 431136 (formerly Aurangabad),
Maharashtra, India

The following specification describes the nature of the invention and the manner in which it is to be performed.

Field of Invention

[001] The present invention relates to a clutch assembly employed in the motorcycles. More particularly, this invention relates to a clutch housing configured with uniquely profiled slots to optimize the flow of lubricating oil, efficient head dissipation, reduce friction and enhance the overall performance and longevity of the clutch system.

Background of the Invention

[002] A clutch is an important sub-system in the powertrain of a vehicle that does the work of smoothly engaging and disengaging the transmission / drivetrain from the engine / power source. The engagement of the clutch between the engine and the drivetrain enables gentle and smooth driving of the vehicle. In motorcycle applications, a manual transmission is typically coupled to the engine via a multi-plate clutch assembly. The said multi-plate clutch assembly is usually operated manually by the rider using a handlebar-mounted lever. In recent vehicle designs clutch assembly for a vehicle, comprises a clutch housing, a clutch plate, and a plate stack, wherein the clutch assembly is either immersed in an oil bath or lubricated by a jet pipe lubrication system positioned over the clutch housing. In systems where the clutch assembly is immersed in an oil bath, sufficient lubrication is provided, and no significant heat-related issues are observed.

[003] However, in systems lubricated by a jet pipe lubrication system, positioned over the clutch housing, challenges arise in providing adequate lubrication between the plate stack and clutch assembly components due to the orientation of the jet pipe being set at the vehicle manufacturer (OEM) end and this orientation being always dynamic / changes with respect to the different architecture of the motorcycles. This insufficient lubrication leads to significant wear issues, including excessive friction marks on the friction plates and clutch hub, overheating of the clutch plates, wear of the aluminum face, and the presence of high levels of burnt particle contamination due to the frictional elements within the clutch assembly. These issues are observed during dynamic operation, resulting in suboptimal clutch performance, premature degradation of clutch components, and an increased risk of mechanical failure and/or clutch failure.

[004] Therefore, there is an unprecedented need to provide a clutch housing that ensures sufficient lubrication in the plate stack of clutches lubricated by the jet pipe leading to efficient heat dissipation, improvement in the clutch life and its overall performance.

Objectives of the Present Invention

[005] The main objective of the present invention is to provide a multi-plate clutch assembly for a vehicle that addresses the challenges of lubrication and heat dissipation as is prevalent in conventional clutch systems of the prior art.

[006] Another objective of the present invention is to provide a multi-plate clutch assembly having a uniquely profiled clutch outer housing configured to have specially designed oil slots that facilitate better oil circulation and improved lubrication between the clutch components.

[007] Yet, the objective of present invention is to provide a multi-plate clutch assembly wherein angular and draft-shaped geometries at the corners and bottom of the oil slots of the clutch outer housing are configured to allow the oil sprayed by the jet pipe to enter the clutch assembly more effectively.

[008] Further objective of present invention is to create an efficient entry path for oil into the clutch stack at the oil slots of the clutch outer housing that facilitate to improve the lubrication, reduces friction, and dissipates the heat more effectively, thereby improving clutch overall performance and longevity.

[009] Still, the objective of the present invention is to enhance the durability of the clutch assembly by minimizing wear and tear, reducing overheating, and substantially decreasing the presence of burnt particle contamination in the clutch assembly.

Brief Description of Drawings

[0010] This invention is illustrated in the accompanying drawings, throughout which like reference numeral and/or letters indicate corresponding parts in the various figures. The embodiments herein and advantages thereof will be better understood from the following description when read with reference to the drawings, wherein

[0011] Figure 1 discloses the exploded view of the multi-plate clutch assembly in accordance with the present invention

[0012] Figure 2 shows perspective view in assembled condition of the multi-plate wet clutch assembly as per the present invention.
[0013] Figure 3 presents the cut-sectional view of the multi-plate clutch assembly disclosing the compression spring housed in the hub clutch as per the present invention.

[0014] Figure 4a describes the perspective view of the clutch housing from the front (i.e. from gear side or outer side) of the multi-plate clutch assembly as per the present invention.

[0015] Figure 4b describes the perspective view of the clutch housing from the inner side of the multi-plate wet clutch assembly as per the present invention

[0016] Figure 4c describes the perspective view from the side of the clutch housing of the multi-plate clutch assembly as per the present invention.

[0017] Figure 4d describes the perspective enlarged view of vertical section of the slot in the clutch housing of the multi-plate clutch assembly as per the present invention

[0018] Figure 4e discloses the inward inclined face of the stem of the Y-profiled slot of the cylindrical body portion of the clutch housing in accordance with the present invention.

[0019] Figure 5 discloses perspective view of the hub clutch in the multi-plate clutch assembly as per the present invention.

[0020] Figure 6 shows the perspective view of the wheel clutch of the multi-plate clutch assembly as per the present invention.
Detailed Description of the Present Invention

[0021] The invention will now be described in detail with reference to the accompanying drawings which must not be viewed as restricting the scope and ambit of the invention. Referring to Fig. 1, the multi-plate wet clutch assembly (300) comprises of a housing clutch assembly (100) and a plate clutch assembly (200). The housing clutch assembly (100) comprises of a housing (10), a gear (12) and a damper plate (14).

[0022] The housing (10) of the housing clutch assembly (100) is configured to have cylindrical structure with a closed side (10CS) and an open side (10OS). The closed side (10CS) has a circular projection (15) and a circumferential cylindrical portion (10CP). The said circular projection (15) projects out from a flat surface (10FS) of the closed side (10CS) in an opposite direction to the open side (10OS) of clutch housing (10) and the circumferential cylindrical portion (10CP) projects out circumferentially from an inclined circumferential surface (10AS) towards the open side (10OS) of the clutch housing in orthogonal direction with the flat surface (10FS) of the closed side (10CS). The inclined circumferential surface (10AS) is formed circumferentially around the flat surface (10FS) of the clutch housing (10).

[0023] The said circumferential portion (10CP) forms a cavity (10C) in the open side (10OS) of the housing (10) to accommodate the plate clutch assembly (200) therein. The circumferential cylindrical wall portion (10CP) is configured to have a plurality of U-profiled slots (10S) for mounting of the friction plates (54). Referring to Figs. 4c and 4d, the said circumferential portion (10CP) of the housing (10) is configured with a plurality of Y-profiled slots (20) extending in the axial direction towards the flat surface (10FS) of the housing (10). Each of the said Y-profiled slots (20) is configured to have a wide portion (20W) and a stem portion (20N) and said wide portion (20W) seamlessly merges with the stem portion (20N) through a curved section (20C). The said U-profiled slots (10S) and the Y-profiled slots (20) are alternatively arranged in the cylindrical wall portion (10CP). The number of these profiled slots (10S and 20) ranges from 8 to 12 depending on the vehicle architecture and specifications i.e. higher the engine capacity (cc) of the vehicle, higher is the number these slots within the defined range.

[0024] The wide portion (20W) of each of the Y-profiled slots (20) has a transverse width (W) and its respective stem potion has a transverse width (w) and said transverse width (W) of the wide portion (20W) is at least two times the transverse width (w) of its stem portion (20N). Further, the wide portion (20W) is configured to have a height (L) and the stem portion (20N) is configured to have a height (l) and said height (L) of the wide portion (20W) is at least 0.5 times the height (l) of the stem portion (20N). The depth (D2) of the Y-profiled slot (20) is in the range of is intelligently optimized to be in the range of 0.65 to 0.80 times the depth (D1) of the U-profiled slot (10S). This optimized ratio of the depths (D1 and D2) facilitates to keep intact the mechanical properties and strength at the root level of the clutch housing (10) thereby eliminating the deflection of the cylindrical wall portion (10CP) at higher rotational speed and higher torque at the clutch housing (10) and at the same time it provides oil retention area inside the clutch housing (10) to have an efficient lubrication of the plate stacks.

[0025] Referring to Figs. 4d and 4e, the stem portion (20N) of the Y-profiled slots (20) is configured to have a radially inward inclined face from the outer peripheral surface towards the inner peripheral surface and said inclination is of angle θ as shown in Fig. 4e. The said inclination angle (θ) of the stem portion (20N) ranges from 5 to 20 degrees so as to efficiently facilitate the unidirectional flow of lubricating oil coming from the oil jet positioned towards outer peripheral surface of the clutch housing (10) into the interior region of the clutch housing assembly into the plate stack. This unidirectional flow of lubrication oil not only provides the desired lubrication but leads to efficient thermal management in a multi-plate wet clutch assembly (300).

[0026] The circular projection (15) of the clutch housing (10) has a thorough opening (11) in the center of the flat surface (10FS). The said opening (11) and the circular projection (15) provide the required confined space for accommodating and supporting a gear (12) and a clutch actuation means (not shown). The clutch actuation means is typically linked with a clutch lever that is mounted either on the handlebar or with foot pedal of the motor vehicle. The flat surface (10FS) is configured to have a plurality of spring seats (10R) formed on the flat surface (10FS) of the clutch housing (10). Further, the said flat surface also has a plurality of hollow cylindrical projections (10P) projecting out from the flat surface (10FS) to receive the rivets (16) therein so as to fit the gear (12) with the housing (10).

[0027] The gear (12) is configured to have a plurality of teeth (12T) on its outer peripheral surface, a central opening (12OP) at the center of the gear (12), a plurality of spring pockets (12SP1, 12SP2, 12SP3, 12SP4, 12SP5), and three elliptical slots (12ES1, 12ES2, 12ES3) formed in between the outer diameter of the central opening (12OP) and the inner diameter of the teeth periphery (12T). The spring pockets (12SP4) and (12SP5) are formed diametrically opposite to each other and the spring pockets (12SP1) is formed at 45° measured with geometric axis of the respective spring pocket (12SP4) in clock-wise direction whereas the pocket (12SP2) is formed at 45° measured with geometric axis of the respective spring pocket (12SP5) in anticlockwise direction. The third spring pocket (12SP3) is formed at 90° measured with geometric axis of the spring pocket (12SP4) in anti-clockwise direction. The elliptical slot (12ES1) is formed in between the spring pockets (12SP1) and (12SP2) while the elliptical slots (12ES2) and (12ES3) are formed alternately in between the spring pockets (12SP4, 12SP3, 12SP5). The said spring pockets (12SP1, 12SP2, 12SP3) houses the damper springs (12b1) and the spring pockets (12SP4, 12SP5) houses the damper springs (12b2). The damper springs (12b1) and the damper springs (12b2) are differing in their spring rate, sometimes called as spring constant. Further, the gear (12) is fitted with the clutch housing (10) by getting the projections (10P) of the housing clutch inserted into the elliptical slots (12ES1, 12ES2, 12ES3) and locked there with the help of rivets (16) wherein said rivets (16) are getting inserted into the openings on the projections (10P) of the housing clutch (10). The teeth (12T) of the gear (12) are in mesh with an output shaft of the engine (not shown) for transmitting torque/power to the clutch assembly (300).

[0028] The damper plate (14) is configured to have a front face (14F), a rear face (14B), a central opening (14C), five spring pockets (14SP1 to 14P5) and three rivet receiving openings (14RO1 to 14RO3). The said spring pockets (14SP1-14P5) are formed in such a way that it maintains the angular orientation with the corresponding spring pockets (12SP1 to 12SP5) of the gear (12). The rivet receiving openings (14RO1) is formed in between the spring pockets (14SP1 and 14SP2) and the rivet receiving openings (14RO2) and (14RO3) are formed alternately in between the spring pockets (14SP4, 14SP3, 14SP5).

[0029] The gear (12) is configured to house a belleville spring (12a) and a plurality of damper springs (12b1 and 12b2). The spring pockets (12SP1, 12SP, 12SP3) of the gear (12), corresponding spring pockets (14SP1, 14SP2, 14SP3) of the damper plate (14) and spring seats (10R) of the clutch housing (10) jointly houses the damper springs (12b1) whereas the spring pockets (12SP4, 12SP5) of the gear (12), corresponding spring pockets (14SP4, 14SP5) of the damper plate (14) and spring seats (10R) of the clutch housing (10) collectively houses the damper springs (12b2). The rivets (16) are inserted in the rivet receiving opening (14RO1, 14RO2, 14RO3) of the damper plate (14) and then passes through the hollow cylindrical projections (10P) of the clutch housing before the riveting operation is performed. Thus, the gear (12) along with the damper plate (14) is attached to the closed side (10CS) of the housing (10) and riveting is done to form the housing clutch assembly (100).

[0030] Referring to Fig. 1, the plate clutch assembly (200) of the multi-plate wet clutch comprises of a wheel clutch (50), a plurality of steel plates (52), a plurality of friction plates (54), a hub clutch (56), a plurality compression springs (58), a clutch holder (60) and a plurality of bolts (62). The wheel clutch (50) is configured to have a front side (50FS) and a back side (50BS) (refer Figs. 6). The front side (50FS) of the wheel clutch is configured to have at least four lugs (70) projecting out from a flat surface (50S1) and positioned at an equal angular distance from each other on the front side (50FS) of the said wheel clutch (50). The said lugs (70) are formed at an angular distance of 90 degrees from each other. The said wheel clutch (50) is configured to have an annular disk portion (50DP) formed around the flat surface (50S1) in such a way that a step is formed in between the said disk portion (50DP) and the flat surface (50S1) of the wheel clutch (50). Further, the wheel clutch (50) has an opening (72) at its center to accommodate the input shaft. Further, the wheel clutch (50) is configured to have a four pairs of at least two teeth (50T) formed on the inner peripheral surface of the disk portion (50DP) of the wheel clutch (50). The each of the pairs of teeth (50T) is at an equiangular orientation, preferably at 90 degrees, with each other and said teeth (50T) are received within the splines (56a) of the hub clutch (56), facilitating the axial movement of the wheel clutch (50) thereby.

[0031] The steel plates (52) and the friction plates (54) are alternatively arranged with each other to form the plate stack (PS). The hub clutch (56) is configured to have plurality of splines (56a) on its outer surface. The splines (56a) on the hub clutch (56) are matching with the internal splines (52a and 54a) of the steel plates (52) and the friction plates (54), respectively. The plate stack of the friction plates and steel plates is mounted on the splined portion of the hub clutch (56).

[0032] Referring to Figs. 5, the hub clutch (56) is configured to have a disc portion (56D) and a cylindrical projection (56P) wherein the cylindrical projection (56P) is integral to the disc portion (56D) and projects away from a flat face (56FS) of the said disc portion (56D). The said cylindrical projection (56P) is configured to have a set of splines (56a) formed at regular interval on the outer peripheral surface of the said cylindrical projection (56P). The said splines (56a) receives the stack of steel plates (52) and friction plates (54) thus facilitating the axial movement of the plate stack thereby. The hub clutch (56) is configured to have a hub insert (84) wherein the said hub insert (84) projects out from a flat surface (56FBS) of a cavity (56C) at its center. The hub insert (84) has an opening (84a) at its center for accommodating the input shaft. The flat surface (56FBS) has at least four lug openings (84b) for receiving the lugs (70) of the wheel clutch (50). The rear face (56BS) of the hub clutch (56) forms a cavity (56C) wherein a hub insert (84) projects out from a flat surface (56FBS) of the cavity (56C) at its center. The said hub insert (84) has an opening (84a) for the receiving the input shaft and at least three lug openings (84b) formed on the flat surface (56FBS) for receiving the lugs (70) of the wheel clutch (50).

[0033] The clutch holder (60) has a central opening (60a) to accommodate the input shaft. The clutch holder (60) is configured to have plate shaped profile Further, the said clutch holder (60) is fitted over the lugs (70) of the wheel clutch (50) by housing the compression springs (58) inside the hub clutch (56) through the suitable fastening means, preferably the bolts (62). Therefore, the inner surface of the lugs (70) is configured to have matching threads with that of the threads of the bolts (62). The plate stack (PS) having a combination of alternately positioned friction plates (54) and steel plates (52) are sandwiched in between the wheel clutch (50) and the clutch hub (56) before the fixing of the clutch holder (60) to the wheel clutch (50) in order to form the plate clutch assembly (200).

[0034] Further, the plate clutch assembly (200) is placed within the cavity (10C) of the housing (10) of the housing clutch assembly (100) to form the multi-plate wet clutch assembly (300). The slots (10S) of circumferential cylindrical portion (10CP) of the housing (10) receives the outer projections (54P) of the friction plate (54) and the flat surface (50S2) of the wheel clutch (50) rests in the cavity (10C) of the housing (10) of the housing clutch assembly (100).

[0035] The damper springs (12b1 & 12b2) are provided in the gear (12) to absorb amplitudes of torsional cycles at higher rpm and higher torque and a plurality of rectangular openings to absorb amplitudes of torsional cycles at lower rpm and higher torque and a belleville spring (12A) is arranged sequentially on top of the gear to provide clamp load on washer for hysteresis friction torque. The damper plate (14) is placed on top of the belleville spring to retain hysteresis pack and to define damping sequence of damper spring. The damper plate has a plurality of openings to insert rivets (16) for fastening of housing clutch (10), gear (12) and damper plate (14).

[0036] As far as the working of the present invention during operation of the multi-plate wet clutch assembly (300), when the clutch assembly (300) is in motion, lubricating oil delivered via a jet pipe impinges upon the outer surface of the clutch housing (10). The inclined faces of the slits (20), angled radially inward at an angle ranging from 5 to 20 degrees from the axis (X1) facilitate the redirection of the incoming oil flow from the outer peripheral region of the clutch housing (10) toward its interior region. The inclined geometry of the Y-shaped slits (20) induces a controlled and guided movement of oil along the axial direction of the slits (20) and ensures that the oil flows effectively into the internal volume of the clutch assembly (300), particularly in regions surrounding and between the friction plates (54), stack plate (52), and associated clutch components, helping to regulate and optimize the distribution of lubricating oil during dynamic clutch operation. The Y-shaped slits (20) specific design enables efficient lubrication and contributes to the thermal management of the multi-plate wet clutch assembly (300), thereby supporting consistent and reliable mechanical performance. Thus, the Y-shaped slits formed in the circumferential portion (10CP) of the clutch housing (10) actively facilitate oil flow into the interior of the clutch assembly.

[0037] The multi plate clutch assembly (300) in accordance with the present invention provides the following technical advantages that contributes to the advancement of technology:
- The present invention provides an improved clutch housing assembly comprising specially designed oil slots that significantly enhance oil ingress into the clutch assembly, thereby facilitating lubrication and cooling performance during operation.
- The oil slots provide efficient entry of lubricating oil, sprayed externally via a force oil circulation (injector spray) system, into the internal plate stack, which was previously limited due to lack of effective oil pathways.
- The specially designed oil slots enhanced oil flow and 80% more oil retention from within the clutch assembly, resulting in improved heat dissipation from frictional surfaces and preventing excessive thermal damage, such as heavy rubbing marks and burn particle contamination
- The specially designed oil slots mitigates wear of the aluminum friction plate face and other clutch components, thus enhancing overall clutch durability and operational life.

The foregoing description of the specific embodiment of the invention will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiment. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiment herein has been described in terms of preferred embodiment, those skilled in the art will recognize that the embodiment herein can be practiced with modification within the spirit and scope of the embodiment as described herein. , Claims:We Claim:

1. A multi-plate clutch assembly (300) for a two wheeled vehicle comprising of:
 a housing clutch assembly (100) having a housing (10), a gear (12), a damper plate (14), a bellievelle spring (12a) and damper springs (12b1 and 12b2); and
 a plate clutch assembly (200) having a wheel clutch (50), a plurality of friction plates (54) having outer projections (54P), a plurality of steel plates (52), a clutch hub (56), a compression spring (58) having grounded ends, a clutch holder (60) and a plurality of bolts (62);
wherein
- the housing (10) of the housing clutch assembly (100) is configured to have cylindrical structure with a closed side (10CS) and an open side (10OS) and the circumferential cylindrical portion (10CP) projects out circumferentially from an inclined circumferential surface (10AS) towards the open side (10OS) of the clutch housing in orthogonal direction with the flat surface (10FS) of the closed side (10CS);
- said circumferential cylindrical wall portion (10CP) is configured to have a plurality of U-profiled slots (10S) for mounting of the friction plates (54) and Y-profiled slots (20) extending in the axial direction towards the flat surface (10FS) of the housing (10);
- said U-profiled slots (10S) and the Y-profiled slots (20) are alternatively arranged in the cylindrical wall portion (10CP) and the number of these profiled slots (10S and 20) ranges from 8 to 12 depending on the vehicle architecture and specifications;
- the wheel clutch (50) is configured to have four lugs (70) spaced at an angular distance of 90 degrees from each other and projecting out from a flat surface (50S1), an annular disk portion (50DP) formed around a flat surface (50S1) and four pairs of at least two teeth (50T) formed on the inner peripheral surface of the disk portion (50DP) of the wheel clutch (50) wherein each of the pairs of teeth (50T) is at an equiangular orientation of 90 degrees; and
- said plate clutch assembly (200) is fitted inside the housing clutch assembly (100) in such a way that the U-profiled slots (10S) of circumferential cylindrical portion (10CP) of the housing (10) of the housing clutch assembly (100) receives the outer projections (54P) of the friction plates (54) of the plate clutch assembly (100); and the flat surface (50S2) of the wheel clutch (50) of the plate clutch assembly (200) rests in the cavity (10C) of the housing (10) of the housing clutch assembly (100).

2. The multi-plate clutch assembly (300) for a two wheeled vehicle as claimed in claim 1, wherein
- each of the said Y-profiled slots (20) is configured to have a wide portion (20W) and a stem portion (20N) and said wide portion (20W) seamlessly merges with the stem portion (20N) through a curved section (20C);
- said wide portion (20W) of each of the Y-profiled slots (20) has a transverse width (W) and its respective stem potion (20N) has a transverse width (w); and
- said transverse width (W) of the wide portion (20W) is at least two times the transverse width (w) of its stem portion (20N).

3. The multi-plate clutch assembly (300) for a two wheeled vehicle as claimed in claim 2, wherein
- the wide portion (20W) of the Y-profiled slots (20) is configured to have a height (L) and the stem portion (20N) is configured to have a height (l) and said height (L) of the wide portion (20W) is at least 0.5 times the height (l) of the stem portion (20N); and
- the depth (D2) of the Y-profiled slot (20) is intelligently optimized to be in the range of 0.65 to 0.80 times the depth (D1) of the U-profiled slot (10S).

4. The multi-plate clutch assembly (300) for a two wheeled vehicle as claimed in claim 3, wherein the stem portion (20N) of the Y-profiled slots (20) of the housing (10) is configured to have a radially inward inclined face having an angle θ from the outer peripheral surface towards the inner peripheral surface and said inclination is of angle θ ranges from 5 to 20 degrees so as to efficiently facilitate the unidirectional flow of lubricating oil into the plate stack.

5. The multi-plate clutch assembly (300) for a two wheeled vehicle as claimed in claim 4, wherein,
- the housing (10) of the housing clutch assembly (100) has a circular projection (15) projecting out from a flat surface (10FS) of a closed side (10CS) and a circumferential cylindrical portion (10CP) having a plurality of slots (10S) forming a cavity (10C) in an open side (10OS);
- the damper plate (14) and the gear (12) are affixed to the closed slide (10CS) of the housing (10) of the housing clutch assembly (100);
- the cylindrical projection (56P) of the hub clutch (56) of the plate clutch assembly (200) has a set of splines (56a) formed at regular interval on the outer peripheral surface of the said cylindrical projection (56P); and
- the clutch holder (60) is fitted over the lugs (70) of the wheel clutch (50) by housing the compression spring (58) inside the hub clutch (56) through a fastening means selected from the bolts (62).

6. The multi-plate clutch assembly (300) for a two wheeled vehicle as claimed in claim 5, wherein
- the circular projection (15) of the clutch housing (10) is configured to have an opening (11) in the center, and said opening (11) and the circular projection (15) jointly provide the required confined space for accommodating and supporting a clutch actuation means and a gear (12); and
- the flat surface (10FS) of said clutch housing (10) has a plurality of spring seats (10R) and three hollow cylindrical projections (10P) projecting out from the flat surface (10FS) and each of the projections having an opening to receive the rivets (16) therein.

7. The multi-plate clutch assembly (300) for a two wheeled vehicle as claimed in claim 6, wherein
- the gear (12) has a plurality of teeth (12T) on its outer peripheral surface, a central opening (12OP) at its center, spring pockets (12SP1, 12SP2, 12SP3, 12SP4, 12SP5), and three elliptical slots (12ES1, 12ES2, 12ES3) formed in between the outer diameter of the central opening (12OP) and the inner diameter of the teeth periphery (12T);
- the damper plate (14) of the housing clutch assembly (100) is configured to have a central opening (14C), five spring pockets (14SP1 to 14P5) and three rivet receiving openings (14RO1-14RO3);
- said gear (12) houses a belleville spring (12a) and a plurality of damper springs (12b1 and 12b2) in the spring pockets;
- the spring pockets (12SP1, 12SP, 12SP3) of the gear (12), corresponding spring pockets (14SP1, 14SP2, 14SP3) of the damper plate (14) and the spring seats (10R) of the clutch housing (10) collectively houses the damper springs (12b1);
- the spring pockets (12SP4, 12SP5) of the gear (12), corresponding spring pockets (14SP4, 14SP5) of the damper plate (14) and the spring seats (10R) of the clutch housing (10) jointly houses the damper spring (12b2); and
- the gear (12) along with the damper plate (14) is attached to the closed side (10CS) of the housing (10) and is rigidly fitted there with the rivets (16) to form the housing clutch assembly (100).

8. The multi-plate clutch assembly (300) for a two wheeled vehicle as claimed in claim 7, wherein,
- the plate stack (PS), having alternate arrangement of the friction plates (54) and steel plates (52), is sandwiched in between the wheel clutch (50) and the clutch hub (56) to form the plate clutch assembly (200);
- said wheel clutch (50) of the plate clutch assembly (200) has an opening (72) at its center to accommodate the input shaft;
- the annular disk portion (50DP) around the flat surface (50S1) of the wheel clutch (50) is configured to form a step profile between the disk portion (50DP) and the flat surface (50S1) of the wheel clutch (50); and
- the inner surface of the lugs (70) is configured to have matching threads with that of the threads of the bolts (62).

Dated this 1st day of July 2025

Sahastrarashmi Pund
Head – IPR
Endurance Technologies Ltd.

To,
The Controller of Patents,
The Patent Office, at Mumbai