Claims:We claim:
1. A multi-plate wet clutch (2000) comprising:
a outer clutch basket (132) and inner clutch basket (130);
a plurality of clutch plate (109);
a plurality of friction plates (108) which are superposed alternately with said clutch plates (109);
a clutch hub (110) which supports alternate arrangement of said clutch plate (109) and said friction plate (108);
wherein said clutch hub (110) has a plurality of teeth (120) on its outer circumference.
2. The multi plate wet clutch (2000) as claimed in claim 1, wherein outer circumference of said clutch hub (110) has said teeth (120) on the complete circumference of said clutch hub (110).
3. The multi plate wet clutch (2000) as claimed in claim 1, wherein outer circumference of said clutch hub (110) has spacing (134) between said plurality of teeth (120) which is equivalent to one and half to five times the width of said teeth (120).

, Description:FIELD OF INVENTION
The present invention relates to a multi-plate wet clutch for a motor vehicle. More particularly, the present invention relates to alternate teeth arrangement in the clutch hub of the multi-plate wet clutch to be used in motor vehicle.
BACKGROUND OF INVENTION
A clutch is a device in motor vehicle which is required to transfer the power from the engine to the wheels by its engaging and disengaging mechanism. In multi-plate clutch, there is an arrangement of alternate friction plates and clutch plate placed alternative to each other which helps in power transmission.
In a multi-plate clutch the alternate stack of friction and clutch plate rests on the clutch hub which acts as the holding structure of the stack arrangement. The hub clutch has gear teeth formed on an outer circumferential surface and spline grooves formed on an inner circumferential portion. The outer circumferential gear teeth engage corresponding with teeth formed on the clutch plates, and the inner circumferential spline grooves engage spline teeth formed on the input shaft of the transmission.
Conventionally the clutch hub comprises of full set of teeth or clustered teeth set on its outer circumference. The general arrangement of teeth is such that there is spacing between each teeth and the width of spacing is equivalent to the width of said one teeth. In case of complete set of teeth, there is excess material requirement which in turn also increases the weight of the entire clutch arrangement as well is not also economical. On the other hand, the cluster of teeth set on the clutch hub faces the reduced strength of the clutch hub in the areas where teeth is unavailable.
In WO2007032283A1, the prior art is a power transmission device capable of transmitting a large force to a pressure member. The clutch hub here has continuous set of teeth as is widely prevalent in most of the multi-plate clutch system. The continuous set of teeth increases the weight of the clutch as a whole and also results in increased cost.
In another prior art WO2016047197A1, the clutch hub has clustered teeth arrangement with spacing in between. Such an arrangement makes the clutch hub prone to damage in the places where tooting isn’t available.
Hence, in light of the cited prior art and their limitations there is a requirement of a clutch hub with improved design which will be efficient as well as economical.
Thus the first objective of the present invention is to provide clutch hub which helps in effective power transfer from the engine to the wheels of a motor vehicle.
The second objective of the present invention is to maintain uniform strength of the clutch hub.
Third objective of the present invention is to provide a clutch hub which is not vulnerable to damage.
The fourth objective of the invention is to have a clutch hub which results in reduction of material requirement.
The final objective of the present invention is to have a clutch hub which is economical and easy to manufacture.
BRIEF DESCRIPTION OF THE INVENTION
In order to achieve the above objects, the present invention provides a multi-plate wet clutch with a clutch hub having teeth placed with an alternate spacing in between. In regular multi plate clutch, the clutch hub has teeth which has spacing in between equivalent to the width of one teeth. The present invention in view of elimination of the above mentioned lacunas of prevailing prior arts, has the arrangement of teeth in the clutch hub such that the spacing in between every teeth is equivalent to one and half to five times the width of one teeth. The clutch hub has teeth formed on an outer circumferential surface and spline grooves formed on an inner circumferential portion. The outer circumferential teeth engage corresponding teeth formed on the clutch plates, and the inner circumferential spline grooves engage spline teeth formed on the input shaft of the transmission.
The presence of spacing between the teeth on the outer circumference which is equivalent to one and half to five times the width of one teeth helps in uniform load distribution and at the same time reduces the material requirement of the entire clutch assembly. This arrangement thus turns out to be economical, easy to manufacture and also durable.
Although the subject matter has been described in considerable detail with reference to certain preferred embodiments thereof, other embodiments are possible. As such, the spirit and scope of the appended claims should not be limited to the description of the preferred embodiment contained therein.

BRIEF DESCRIPTION OF THE DRAWINGS
Other aspects of the invention will become apparent by consideration of the accompanying drawings and their description stated below, which are merely illustrative of a preferred embodiment of the invention and do not limit in any way the nature and scope of the invention.
Figure 1A illustrates the perspective front view of multi plate wet clutch according to the present invention.
Figure 1B illustrates the perspective back view of multi plate wet clutch according to the present invention.
Figure 2 illustrates the exploded view of multi-plate wet clutch according to the present invention.
Figure 3A illustrates the perspective view of the clutch hub with regular spacing between teeth as available in the prior art.
Figure 3B illustrates the perspective view of the clutch hub in accordance with the present embodiment.
Figure 4A illustrates the magnified view of the part of clutch hub with spacing between teeth as available in the prior art.
Figure 4B illustrates the magnified view of the part of clutch hub in accordance with the present embodiment.

DETAILED DESCRIPTION OF THE DRAWINGS
The invention will now be described with reference to the accompanying drawings which do not limit the scope and ambit of the invention. The description provided is purely by way of example and illustration.
The Figure 1A and 1B in the present invention shows the perspective front and back view respectively of multi plate wet clutch (2000). The multi-plate wet clutch (2000) consists of housing clutch (102) which is attached to the gear (101). The power from engine (not shown in the diagram) via the engine gear (not shown in the diagram) is directed to the multi-plate clutch (2000) and then to the gear box (not shown in diagram) by the stack of clutch plate (109) and friction plate (108) which forms a part of the inner clutch basket (130). The gear side of the multi-plate wet clutch (2000) has the damper plate (106) with the damping spring (103) which helps dampen the vibration coming from the gear box input (104).
Figure 2 shows the exploded view of the multi-plate wet clutch (2000). The multi-plate wet clutch (2000) system comprises an outer clutch basket (132) and an inner clutch basket (130) with a thrust washer (123) in between said outer clutch basket (132) and said inner clutch basket (130). The power from engine (not shown in the diagram) is received from the gear assembly (not shown in diagram) and is transferred to the outer clutch basket (132). This power gets transferred to the friction plate (108) and thereafter to the clutch plate (109) which form a part of the inner clutch basket (130). The clutch hub (110) acts as the resting plate for the stack of alternate friction plate (108) and clutch plate (109) which is compressed and fitted by a pressure plate (105) by the help of compression springs (107) and the associated hexagonal bolts (122). The outer clutch basket (132) is a bowl-shaped gear-driven housing comprising of belleville spring (126) and belleville washer (124) placed on the gear (101). The damper plate (106) along with the damper springs (103) are bolted onto the end of the clutch shaft by rivet (128) and functions as the cover for multi-plate wet clutch (2000).
The Figure 3A and 3B shows the perspective view of the clutch hub (110A) as in prior art and perspective view of the clutch hub (110) as in the present invention respectively. The prior art as in Figure 3A shows the clutch hub (110A) with the arrangement of teeth (120A) such that the spacing (134A) in between said teeth (120A) is equivalent to the width of one teeth (120A). On the other hand, the present invention as in Figure 3B shows the clutch hub (110) which acts as the resting structure for the stack of alternate friction plate (108) and clutch plate (109) has teeth (120) formed on an outer circumferential surface and spline grooves (not shown in figure). The teeth (120) placed on the outer circumference of the clutch hub (110) engage with corresponding teeth formed on the clutch plates (109), and the inner circumferential spline grooves (not shown in figure) engage with spline teeth formed on the input shaft of the transmission and thereby helps in power transfer. The teeth (120) on the outer circumference of the clutch hub (110) as in the present invention is placed in a way such that the spacing (134) between the teeth (120) is equivalent to three times the width of one teeth (120) as in the present embodiment. The spacing (134) ranges from one and half to five times of the width of one teeth (120). This teeth (120) arrangement on the outer circumference of clutch hub (110) results in reduction of material requirement and also the deformation pattern under loading condition is evenly distributed.
The Figure 4A and 4B shows the magnified view of a quarter of the clutch hub (110A) as in prior art and clutch hub (110) as in the present invention respectively. The Figure 4A shows the clutch hub (110A) with the set of teeth (120A) as on the outer circumference of said clutch hub (110A) with spacing (134A) such that width of said spacing (134A) is equivalent to the width of one teeth (120A). The fainted lined teeth (136) as in the Figure 4A are the teeth (136) which are being removed in the present invention as shown in Figure 4B. As shown in Figure 4B, the clutch hub (110) of the present invention has teeth (120) on the outer circumference of the clutch hub (110) such that the width of spacing between said teeth (120) is three times the width of one teeth (120) in the present embodiment.
The technical advancements offered by the present disclosure include:
• The present invention results in uniform strength to the clutch hub by the spacing in between teeth arrangement so provided such that the spacing between teeth is equivalent to one and half to five times the width of one teeth.
• Due to this increased spacing between the teeth arrangement, the deformation pattern under loading condition is evenly distributed.
• The teeth arrangement in the outer circumference of the clutch hub results in reduction of material requirement and thereby reduces the weight of the entire clutch assembly.
While considerable emphasis has been placed herein on the specific features of the preferred embodiment, it will be appreciated that many additional features can be added and that many changes can be made in the preferred embodiment without departing from the principles of the disclosure. These and other changes in the preferred embodiment of the disclosure 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 disclosure and not as a limitation.

LIST OF REFERENCE NUMERAL
101-Gear
102-Housing clutch
103-Damper Spring
104, 104A-To Gear box input
105-Pressure Plate
106-Damper plate
107-Compression Spring
108-Friction Plate
109-Clutch Plate
110, 110A-Clutch hub
120, 120A-Teeth
122-Hexagonal Bolt
123-Thrust Washer
124-Belleville Washer
126-Belleville Spring
128-Rivet
130-Inner Clutch Basket
132-Outer Clutch Basket
134, 134A-Spacing
136-Fainted Lined Teeth
2000-Exploded View of Multi-Plate Wet Clutch