Multi-plate wet clutch device

Abstract

The present invention is characterized by comprising: a drum member rotatably installed in a space where operating oil is filled; a hub member rotatably inserted into the drum member and connected to a drive shaft; a plurality of friction plates slidably connected to the drum member and arranged at a distance from each other; a plurality of separating plates slidably connected to the hub member and interposed between the friction plates; and a separation acceleration unit formed such that the cross-sectional area of ​​a passage formed between the friction plates and the separating plates is varied to increase the flow velocity of oil passing through the gap between the friction plates and the separating plates.

Description

Technology Field

[0001] The present invention relates to a multi-plate wet clutch device that can prevent drag torque by preventing oil supplied between the friction plate and the separator plate from remaining between the friction plate and the separator plate even after the disengagement operation of the clutch device, and can prevent overheating caused by friction between the friction plate and the separator plate. Background Technology

[0002] Generally, a clutch unit for an automatic transmission consists of a clutch retainer, a disc unit, a piston, etc.

[0003] The disc unit is equipped with a clutch disc and a clutch plate, and oil is supplied between the clutch disc and the clutch plate, and an oil film layer is formed due to the viscosity of the oil.

[0004] However, due to the viscous force of the oil film layer, even when the pressure of the disc unit is released, the clutch disc and the clutch plate come into close contact with each other, causing a drag torque.

[0005] The background technology of the present invention is disclosed in Korean Registered Patent Publication No. 10-0482099 (published on April 13, 2005, title of invention: clutch device for automatic transmission). The problem to be solved

[0006] The present invention aims to provide a multi-plate wet clutch device that can prevent oil from remaining between the friction plate and the separator plate and forming a film layer by increasing the discharge speed of the oil passing between the friction plate and the separator plate when the separation operation of the clutch device is initiated, by having a separation acceleration part that rapidly discharges the oil supplied between the friction plate and the separator plate.

[0007] The present invention aims to provide a multi-plate wet clutch device that can prevent the separator plate and friction plate from overheating more than necessary and prevent malfunction or damage to the clutch device caused by overheating of the separator plate and friction plate by having a heat dissipation part that increases the contact area between the oil passing between the friction plate and the separator plate and the friction plate. means of solving the problem

[0008] The present invention is characterized by comprising: a drum member rotatably installed in a space where operating oil is filled; a hub member rotatably inserted into the drum member and connected to a drive shaft; a plurality of friction plates slidably connected to the drum member and arranged at a distance from each other; a plurality of separating plates slidably connected to the hub member and interposed between the friction plates; and a separation acceleration unit formed such that the cross-sectional area of ​​a passage formed between the friction plates and the separating plates is varied to increase the flow velocity of oil passing through the gap between the friction plates and the separating plates.

[0009] The friction plate of the present invention may include a plurality of core plates slidably installed on the drum member while maintaining a gap; a first gear tooth protruding from the core plate to be spline-gear connected to the drum member; and a friction member installed on one or the other side of the core plate to frictionally contact the separator plate.

[0010] The separator plate of the present invention may include a friction surface interposed between the friction plates and frictionally coupled with the friction member; and a second gear tooth protruding from the friction surface and slidably connected to the hub member.

[0011] The separation acceleration part of the present invention may include an inclined surface provided on the second gear tooth so that the gap between the second gear tooth and the separation plate is widened.

[0012] The inclined surface of the present invention may include a first inclination provided on one surface of the second gear tooth; and a second inclination provided on the other surface of the second gear tooth.

[0013] The present invention may further include a heat dissipation part that increases the contact area between the oil passing through the gap between the friction plate and the separator plate and the friction plate or the separator plate.

[0014] The heat dissipation part of the present invention may include a plurality of spaced protrusions that protrude from the second gear tooth and are arranged with a spaced interval.

[0015] The spacing protrusion of the present invention may include a plurality of first protrusions protruding at a spaced interval on one surface of the second gear tooth; and a plurality of second protrusions protruding at a spaced interval on the other surface of the second gear tooth.

[0016] The heat dissipation part of the present invention may include a plurality of spaced protrusions that protrude from the first gear tooth and are arranged at a spaced interval.

[0017] The spacing protrusion of the present invention may include a plurality of third protrusions protruding at a spaced interval on one surface of the first gear tooth; and a plurality of fourth protrusions protruding at a spaced interval on the other surface of the first gear tooth. Effects of the invention

[0018] The multi-plate wet clutch device according to the present invention is equipped with a separation acceleration unit that increases the discharge speed of oil supplied between the friction plate and the separation plate, so that when the clutch device is separated, the oil passing through the gap between the friction plate and the separation plate is accelerated, and the oil remaining between the friction plate and the separation plate can prevent the formation of a film layer.

[0019] The multi-plate wet clutch device according to the present invention has the advantage that the oil discharge speed is effectively increased as the oil discharged from the inner part to the outer part of the friction plate and the separator plate passes through the passage where the cross-sectional area narrows, thereby forming a separation acceleration part such that the cross-sectional area between the friction plate and the separator plate narrows, thereby increasing the oil discharge speed.

[0020] The multi-plate wet clutch device according to the present invention has the advantage that, since the separation acceleration part is provided on the second gear tooth of the separation plate which is gear-connected to the hub member in a spline gear manner, when oil discharged through the oil discharge hole of the hub member passes through the gap between the friction plate and the separation plate, the oil discharge speed increases as it passes through the separation acceleration part in which the cross-sectional area gradually narrows, and it enters the gap between the friction plate and the separation plate, so that it is discharged together with the oil remaining between the friction plate and the separation plate, and the friction plate and the separation plate that were in close contact with each other can be easily separated.

[0021] The multi-plate wet clutch device according to the present invention has the advantage of being able to provide a plurality of separation acceleration members in a multi-plate wet clutch device in which a plurality of friction plates and separation plates are alternately arranged, by forming an inclined surface including a first inclination formed on one side of the second gear tooth of the separation plate and a second inclination formed on the other side of the second gear tooth, so that a separation acceleration member is formed between a friction plate arranged opposite to one side of the separation plate and the first inclination, and a separation acceleration member is formed between a friction plate arranged opposite to the other side of the separation plate and the second inclination.

[0022] The multi-plate wet clutch device according to the present invention has a heat dissipation unit that effectively transfers and discharges thermal energy generated during frictional operation of the clutch device to the oil by passing through the gap between the friction plate and the separator plate. Therefore, the thermal energy generated on the friction plate and the separator plate during frictional operation is discharged along the oil passing through the gap between the friction plate and the separator plate by the action of the heat dissipation unit, thereby preventing the friction plate and the separator plate from being deformed or damaged due to overheating.

[0023] The multi-plate wet clutch device according to the present invention includes a gap protrusion formed on the second gear tooth to increase the contact area between the second gear tooth of the separator plate and the oil. Therefore, when oil passing through the gap between the friction plate and the separator plate passes through the second gear tooth, the oil comes into contact with the gap protrusion protruding from the second gear tooth, and the thermal energy transmitted along the metal separator plate can be easily transferred to the oil and discharged.

[0024] The multi-plate wet clutch device according to the present invention has the advantage of being able to provide a gap protrusion in each of the multiple gaps in a multi-plate wet clutch device in which a plurality of friction plates and a plurality of separation plates are alternately arranged, by including a first protrusion formed on one side of the second gear tooth of the separation plate and a second protrusion formed on the other side of the second gear tooth to form a gap protrusion.

[0025] The multi-plate wet clutch device according to the present invention is provided on the second gear tooth such that an inclined surface forming a separation acceleration part and a gap protrusion are alternately arranged, so as the height of the gap protrusion increases toward the inner side of the second gear tooth, the contact area between the oil passing through the gap between the gap protrusions and the gap protrusions is more effectively widened. Brief explanation of the drawing

[0026] FIG. 1 is a schematic diagram showing a multi-plate wet clutch device according to one embodiment of the present invention. FIG. 2 is a perspective view showing the stacked state of the friction plate and the separator plate of a multi-plate wet clutch device according to one embodiment of the present invention. FIG. 3 is an exploded perspective view showing the friction plate and the separator plate of a multi-plate wet clutch device according to one embodiment of the present invention. FIG. 4 is a perspective view showing a separator plate of a multi-plate wet clutch device according to one embodiment of the present invention. FIG. 5 is a cross-sectional perspective view showing the separation acceleration part and the heat dissipation part of a multi-plate wet clutch device according to one embodiment of the present invention. FIG. 6 is a usage state diagram showing the separation acceleration part of a multi-plate wet clutch device according to one embodiment of the present invention. Specific details for implementing the invention

[0027] Hereinafter, an embodiment of a multi-plate wet clutch device according to the present invention will be described with reference to the attached drawings.

[0028] In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for the sake of clarity and convenience of explanation.

[0029] In addition, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intention or practice of the user or operator.

[0030] Therefore, the definitions of these terms should be based on the content throughout this specification.

[0031] FIG. 1 is a schematic diagram showing a multi-plate wet clutch device according to one embodiment of the present invention, FIG. 2 is a perspective view showing a stacked state of a friction plate and a separator plate of a multi-plate wet clutch device according to one embodiment of the present invention, and FIG. 3 is an exploded perspective view showing a friction plate and a separator plate of a multi-plate wet clutch device according to one embodiment of the present invention.

[0032] FIG. 4 is a perspective view showing a separator plate of a multi-plate wet clutch device according to one embodiment of the present invention, FIG. 5 is a cross-sectional perspective view showing a separation acceleration part and a heat dissipation part of a multi-plate wet clutch device according to one embodiment of the present invention, and FIG. 6 is a usage state diagram showing a separation acceleration part of a multi-plate wet clutch device according to one embodiment of the present invention.

[0033] Referring to FIGS. 1 to 6, a multi-plate wet clutch device according to one embodiment of the present invention comprises a drum member (10) rotatably installed in a space where operating oil is filled, a hub member (16) rotatably inserted into the drum member (10) and connected to a drive shaft (18), a plurality of friction plates (30) slidably connected to the drum member (10) and arranged at a distance from each other, a plurality of separating plates (50) slidably connected to the hub member (16) and interposed between the friction plates (30), and a separation acceleration part (70) formed such that the cross-sectional area of ​​a passage formed between the friction plates (30) and the separating plates (50) is varied so as to increase the flow rate of oil passing through the gap between the friction plates (30) and the separating plates (50).

[0034] The drum member (10) of the present embodiment can be installed on the drive shaft (18) of an automatic transmission for a vehicle, and can be installed in various power transmission devices, such as a differential in which a working fluid is filled and power is transmitted or cut off.

[0035] Additionally, the present embodiment further includes a piston member (12) installed on a drum member (10) so as to be able to move forward or backward toward a friction plate (30) or a separator plate (50), and a pressure chamber (14) provided in the gap between the piston member (12) and the drum member (10) to press the piston member (12) toward the friction plate (30) or the separator plate (50) to cause friction, and in which oil is filled or discharged.

[0036] Accordingly, when oil is filled into the pressurizing chamber (14) by the operation of the oil supply unit, the piston member (12) slides along the inner wall of the drum member (10) and presses the separator plate (50) toward the friction plate (30), thereby bringing the separator plate (50) and the friction plate (30) into close contact.

[0037] As described above, when a plurality of friction plates (30) and separator plates (50) are arranged alternately and in close contact, the drum member (10) and the hub member (16) are integrally connected, so that power supplied along the drum member (10) passes through the friction plates (30), separator plates (50), and hub member (16) and is transmitted to the drive shaft (18), thereby enabling power transmission.

[0038] When the clutch device is switched from the coupled state to the separated state, the oil filled in the pressurized chamber (14) is discharged, and as the oil passes through the hub member (16) and is discharged into the gap between the friction plate (30) and the separator plate (50), the close contact between the friction plate (30) and the separator plate (50) is released, thereby blocking power transmission.

[0039] At this time, the oil remaining between the friction plate (30) and the separator plate (50) can maintain the viscous force between the friction plate (30) and the separator plate (50) while forming a film layer. In this embodiment, the discharge speed of the oil discharged along the gap between the friction plate (30) and the separator plate (50) is improved by the action of the separation acceleration unit (70), thereby preventing oil from remaining between the friction plate (30) and the separator plate (50) while the separation operation of the clutch device is in progress.

[0040] As described above, by preventing oil from remaining between the friction plate (30) and the separation plate (50) through the action of the separation acceleration part (70), it is possible to prevent the drag torque that maintains the connection state between the friction plate (30) and the separation plate (50) while oil remains between the friction plate (30) and the separation plate (50).

[0041] The friction plate (30) of the present embodiment includes a plurality of core plates (32) that are slidably installed on a drum member (10) while maintaining a gap, a first gear tooth (36) protruding from the core plate (32) to be spline-gear connected to the drum member (10), and a friction member (34) installed on one or the other side of the core plate (32) to frictionally contact a separator plate (50).

[0042] The core plate (32) is made of a ring-shaped panel, and a plurality of first gear teeth (36) are formed on the outer surface of the core plate (32) and are gear-connected with spline gear teeth formed on the inner wall of the drum member (10).

[0043] Accordingly, the core plate (32) is slidably installed on the inner wall of the drum member (10), and since the gear tooth of the drum member (10) and the first gear tooth (36) are gear-connected, the core plate (32) rotates by power provided along the drum member (10).

[0044] Since the first gear tooth (36) has a first dispersion slope (37) formed on both sides so that its planar shape forms a trapezoid, the corner formed between the first gear tooth (36) and the core plate (32) forms an obtuse angle.

[0045] In addition, since the first gear tooth (36) is connected to the gear tooth of the drum member (10) formed in an inverted trapezoidal shape, it is possible to prevent fatigue load from being concentrated in the curved portion where the first gear tooth (36) is formed, as the gear tooth of the drum member (10) is pressed.

[0046] The separator plate (50) includes a friction surface (52) interposed between the friction plates (30) and frictionally connected to the friction member (34), and a second gear tooth (54) protruding from the friction surface (52) and slidably connected to the hub member (16).

[0047] The friction surface (52) is made of a ring-shaped panel identical to the core plate (32) so as to be laminated on one or the other side of the core plate (32), and a second gear tooth (54) is formed on the inner surface and is gear-connected with a spline gear tooth formed on the outer surface of the hub member (16).

[0048] Accordingly, the separator plate (50) is slidably installed on the circumference of the hub member (16) and rotates integrally with the hub member (16).

[0049] The second gear tooth (54) protrudes from the inner circumference of the friction surface (52), and the second dispersion slope (55) is formed on both sides to form a trapezoidal planar shape, and is connected to the gear tooth of the inverted trapezoidal hub member (16).

[0050] As described above, since the second gear tooth (54) forms an obtuse angle with the friction surface (52), when it is connected to the gear tooth of the hub member (16) which is formed in an inverted trapezoidal shape, it is possible to prevent fatigue load from being concentrated on the curved portion of the second gear tooth (54) that is pressed by the gear tooth of the hub member (16).

[0051] A hub member (16) is rotatably inserted into the central part of a drum member (10), and a drive shaft (18) is connected to the central part of the hub member (16). A plurality of separator plates (50) and friction plates (30) are arranged alternately and supported by a flange (56) and a snap ring (58) installed at the bottom of the hub member.

[0052] The piston member (12) is rotatably installed in the gap between the drum member (10) and the hub member (16), and since the end of the piston member (12) is installed facing the friction plate (30) or the separator plate (50), when oil is filled into the pressure chamber (14) formed in the gap between the drum member (10) and the piston member (12), the piston member (12) is pressed toward the friction plate (30) and the separator plate (50).

[0053] When the piston presses the friction plate (30) and the separator plate (50) by the operation described above, the plurality of friction plates (30) and the separator plates (50) come into close contact with each other, thereby integrally connecting the drum member (10) and the hub member (16).

[0054] When the separation operation in which the friction plate (30) and the separation plate (50) are separated from each other proceeds, the oil discharged through the hub member (16) passes through the gap between the friction plate (30) and the separation plate (50), thereby separating the friction plate (30) and the separation plate (50). At this time, the discharge speed of the oil increases above a set value due to the action of the separation acceleration unit (70), so that the friction plate (30) and the separation plate (50) can be effectively separated.

[0055] The separation acceleration part (70) of the present embodiment includes an inclined surface (72) provided on the second gear tooth (54) so ​​that the gap between the second gear tooth (54) and the separation plate (50) is widened.

[0056] The oil that passes through the hub member (16) and is discharged into the gap between the friction plate (30) and the separator plate (50) passes first through the second gear tooth (54) which is gear-connected to the hub member (16) before entering the gap between the friction plate (30) and the separator plate (50). Since the separation acceleration part (70) of this embodiment includes an inclined surface (72) provided on the second gear tooth (54), the gap between the second gear tooth (54) and the second gear tooth (54) is widened by the inclined surface (72).

[0057] As described above, when an inclined surface (72) is formed on one or the other side of the second gear tooth (54), the gap between the second gear tooth (54) and the second gear tooth (54) is widened by the inclined surface (72), and a funnel shape is formed in which the gap narrows as it goes toward the gap between the friction surface (52) and the core plate (32).

[0058] Therefore, the oil passing through the discharge hole provided in the hub member (16) and through the gap between the second gear teeth (54) moves along the inclined surface (72) to the gap between the friction surface (52) and the core plate (32), and as the cross-sectional area of ​​the passage narrows, the effect of increasing the speed of the oil's movement is provided.

[0059] As described above, the oil, which has increased moving speed while passing through the gap between the second gear teeth (54), is sprayed into the gap between the friction member (34) attached to the core plate (32) and the friction surface (52). Consequently, the oil supplied between the friction member (34) and the friction surface (52) is rapidly discharged, thereby preventing the formation of a film layer and allowing the friction plate (30) and the separator plate (50) to be rapidly separated.

[0060] The inclined surface (72) of the present embodiment may include a first inclined surface (74) provided on one side of the second gear tooth (54) and a second inclined surface (76) provided on the other side of the second gear tooth (54).

[0061] Accordingly, a first slope (74) is positioned between the friction plate (30) facing one side of the separator plate (50), and a second slope (76) is positioned between the friction plate (30) facing the other side of the separator plate (50). Thus, when a plurality of friction plates (30) and a plurality of separator plates (50) are alternately arranged to form a clutch device, the first slope (74) and the second slope (76) are positioned facing each other at intervals between the plurality of friction plates (30) and the separator plate (50), thereby providing a passage that forms a funnel-shaped cross-sectional shape.

[0062] In addition, the present embodiment further includes a heat dissipation part (80) that widens the contact area between the oil passing through the gap between the friction plate (30) and the separator plate (50) and the friction plate (30) or the separator plate (50), so that as the contact area between the oil passing through the gap between the friction plate (30) and the separator plate (50) and the friction plate (30) or the separator plate (50) widens, the heat energy generated from the overheated friction plate (30) or separator plate (50) is transferred to the oil and can be dissipated to the outside of the friction plate (30) or the separator plate (50).

[0063] The heat dissipation part (80) protrudes from the second gear tooth (54) and includes a plurality of spaced protrusions (82) arranged at intervals, so that the plurality of spaced protrusions (82) are arranged continuously to form an uneven shape.

[0064] The thickness of the gap protrusions (82) can be 1 to 10 mm, and the gap depth between the gap protrusions (82) can be 0.2 to 1 mm. A plurality of gap protrusions (82) are formed continuously while maintaining a constant spacing to function as heat dissipation fins, thereby enabling effective release of thermal energy from the separator plate (50) and the second gear tooth (54).

[0065] The spacing protrusion (82) may include a first projection (84) that protrudes at a spaced interval on one side of the second gear tooth (54), and a second projection (86) that protrudes at a spaced interval on the other side of the second gear tooth (54).

[0066] Accordingly, a plurality of first protrusions (84) are formed continuously on one side of the second gear tooth (54), and a plurality of second protrusions (86) are formed continuously on the other side of the second gear tooth (54), and a first slope (74) is provided in the space between the first protrusions (84), and a second slope (76) is provided in the space between the second protrusions (86).

[0067] When a plurality of friction plates (30) and separator plates (50) are alternately stacked and arranged as shown in FIG. 6, the second slope (76) located on the upper side and the first slope (74) located on the lower side are arranged facing each other to form a funnel-shaped flow path, and since both sides of this flow path are partitioned by the first protrusion (84) and the second protrusion (86), a funnel-shaped flow path through which oil passes is formed.

[0068] As described above, the oil passing through the funnel-shaped flow path formed by the first slope (74), the second slope (76), the first protrusion (84), and the second protrusion (86) enters the gap between the friction plate (30) and the separator plate (50) where the cross-sectional area narrows, and the discharge speed increases so that the oil remaining between the friction plate (30) and the separator plate (50) is effectively discharged to the outside of the friction plate (30) and the separator plate (50), thereby enabling the separation of the friction plate (30) and the separator plate (50) to be carried out effectively.

[0069] Additionally, the heat dissipation part (80) of the present embodiment may include a plurality of spaced protrusions (82) that protrude from the first gear tooth (36) and are arranged with spaced intervals, and the spaced protrusions (82) may include a plurality of third protrusions that protrude with spaced intervals on one side of the first gear tooth (36) and a plurality of fourth protrusions that protrude with spaced intervals on the other side of the first gear tooth (36).

[0070] As described above, if the heat dissipation part (80) further includes a third protrusion and a fourth protrusion, the oil discharged through the gap between the friction plate (30) and the separator plate (50) can come into contact with the third protrusion and the fourth protrusion, thereby additionally discharging thermal energy and making it possible to more effectively improve the heat dissipation efficiency.

[0071] Thus, by providing a separation acceleration unit that rapidly discharges oil supplied between the friction plate and the separation plate, when the separation operation of the clutch device is initiated, the discharge speed of the oil passing between the friction plate and the separation plate is increased, thereby preventing oil from remaining between the friction plate and the separation plate and forming a film layer, thereby providing a multi-plate wet clutch device.

[0072] In addition, by providing a heat dissipation member that increases the contact area between the oil passing between the friction plate and the separator plate, the thermal energy generated during the friction operation of the clutch device can be effectively transferred to the oil through the action of the heat dissipation member, thereby preventing the separator plate and the friction plate from overheating more than necessary and preventing malfunction or damage of the clutch device caused by overheating of the separator plate and the friction plate, thereby providing a multi-plate wet clutch device.

[0073] Although the present invention has been described with reference to an embodiment illustrated in the drawings, this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom.

[0074] In addition, although a multi-plate wet clutch device has been described as an example, this is merely illustrative, and the clutch device of the present invention can be used in other products other than a multi-plate wet clutch device.

[0075] Therefore, the true technical scope of protection of the present invention should be determined by the following patent claims. Explanation of the symbols

[0076] 10 : Drum member 12 : Piston member 14 : Pressurized chamber 16 : Hub member 18 : Drive shaft 30 : Friction plate 32 : Core plate 34 : Friction member 36 : 1st gear tooth 37 : 1st dispersion inclination 50 : Separator 52 : Friction surface 54 : 2nd gear tooth 55 : 2nd dispersion inclination 56 : Flange 58 : Snap ring 70 : Separation acceleration section 72 : Inclined surface 74 : 1st slope 76 : 2nd slope 80 : Heat dissipation part 82 : Gap protrusion 84: 1st projection 86: 2nd projection

Claims

Claim 1 A drum member rotatably installed in a space where operating oil is filled; a hub member rotatably inserted into the drum member and connected to a drive shaft; a plurality of friction plates slidably connected to the drum member and arranged at intervals; a plurality of separator plates slidably connected to the hub member and interposed between the friction plates; and a separation acceleration unit formed such that the cross-sectional area of ​​a passage formed between the friction plates and the separator plates is varied to increase the flow velocity of oil passing through the gap between the friction plates and the separator plates; wherein the friction plates include a core plate slidably installed at intervals in the drum member; a first gear tooth protruding from the core plate to be spline-gear connected to the drum member; and a friction member installed on one or the other side of the core plate and frictionally contacting the separator plates; wherein the separator plates include a friction surface interposed between the friction plates and frictionally contacting the friction member. A multi-plate wet clutch device comprising a second gear tooth protruding from the friction surface and slidably gear-connected to the hub member, wherein the separation acceleration member comprises an inclined surface provided on the second gear tooth to widen the gap between the second gear tooth and the separation plate. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 A multi-plate wet clutch device according to claim 1, characterized in that the inclined surface comprises: a first inclination provided on one surface of the second gear tooth; and a second inclination provided on the other surface of the second gear tooth. Claim 6 A multi-plate wet clutch device according to claim 1, further comprising a heat dissipation portion that widens the contact area between the oil passing through the gap between the friction plate and the separator plate and the friction plate or the separator plate. Claim 7 A multi-plate wet clutch device according to claim 6, characterized in that the heat dissipation portion protrudes from the second gear tooth and includes a plurality of spaced protrusions arranged at spaced intervals. Claim 8 A multi-plate wet clutch device according to claim 7, wherein the spacing protrusion comprises: a first projection protruding at a spaced interval on one surface of the second gear tooth; and a second projection protruding at a spaced interval on the other surface of the second gear tooth. Claim 9 A multi-plate wet clutch device according to claim 6, characterized in that the heat dissipation portion protrudes from the first gear tooth and includes a plurality of spaced protrusions arranged at a distance. Claim 10 A multi-plate wet clutch device according to claim 9, wherein the spacing protrusion comprises: a plurality of third protrusions protruding at a spaced interval on one surface of the first gear tooth; and a plurality of fourth protrusions protruding at a spaced interval on the other surface of the first gear tooth.

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