Clutch friction plate combination unit and clutch device

Abstract

The invention provides a clutch friction plate combination unit and a clutch device.The clutch friction plate combination unit comprises a clutch hub and a first friction plate, an assembly hole coaxial with the clutch hub is formed in the clutch hub, and a plurality of arc grooves are formed in the assembly hole; the multiple arc groove circles are arranged in the circumferential direction of the assembly hole at intervals, multiple first outer teeth are arranged on the outer circumferential face of the first friction plate and arranged in the circumferential direction of the first friction plate at intervals, and arc faces matched with the arc grooves are arranged on the first outer teeth. The multiple first outer teeth are arranged in the arc grooves so that the multiple first outer teeth can be arranged in the arc grooves correspondingly, and therefore the first friction plate can be in transmission connection with the clutch hub through cooperation of the first outer teeth and the arc grooves, and by arranging the arc grooves and the first outer teeth, the impact force borne by the tooth surfaces is reduced; the bearing capacity of the combined unit is improved, and meanwhile the machining difficulty of the combined unit can be lowered.

Description

Technical Field

[0001] The present application relates to the technical field of clutches, and further to a clutch friction plate combination unit and a clutch device. Background Art

[0002] In the current powertrain system, the clutch plays an increasingly important role, responsible for transferring the power source (torque and speed) such as the engine or electric motor to the wheels through the clutch engagement (including slip) or release (sending instructions to the clutch through the throttle status, speed, current gear information, etc.) to drive the vehicle forward. Among them, after years of technological development, the clutch technology has become more and more mature and more and more popular with customers.

[0003] When the clutch is working, it is necessary to compress multiple inner and outer friction plates. Under the friction force of the inner and outer friction plates, the clutch hub (drive shaft), outer friction plate, inner friction plate, and clutch drum (output gear) are compressed and combined into one, so that power can be transmitted from the drive shaft to the output gear. The outer friction plate and the clutch hub (drive shaft) are spline-connected, and the inner friction plate and the clutch drum (output gear) are spline-connected to transmit power. At present, the outer friction plate and the clutch hub are mostly involute spline tooth shapes. However, this type of involute spline tooth shape is difficult to process, and the involute tooth shape has a small pressure angle, resulting in excessive impact force on the tooth surface when compressed and combined, which requires further processing to meet strength requirements, thereby further increasing the difficulty of processing the spline tooth shape.

[0004] Therefore, the present invention is devoted to providing a clutch friction plate combination unit and a clutch device. Summary of the invention

[0005] In response to the above-mentioned technical problems, the purpose of the present application is to provide a clutch friction plate combination unit and a clutch device, which aims to reduce the processing difficulty of the combination unit, reduce the impact force on the combination unit during operation, and improve the load-bearing capacity and reliability of the combination unit by cooperating between the arc groove of the clutch hub and the first external tooth of the first friction plate.

[0006] In order to achieve the above-mentioned object, the present application provides a clutch friction plate assembly unit, comprising:

[0007] A clutch hub, wherein the clutch hub is provided with an assembly hole coaxially arranged with the clutch hub, wherein a plurality of circular arc grooves are arranged in the assembly hole, and the plurality of circular arc grooves are arranged at intervals along the circumference of the assembly hole;

[0008] A first friction plate, wherein a plurality of first external teeth are arranged on an outer peripheral surface of the first friction plate, and the plurality of first external teeth are arranged at intervals along the circumference of the first friction plate;

[0009] Among them, the first external teeth are provided with an arc surface matching with the arc groove, so that a plurality of the first external teeth are respectively arranged in the arc groove, so that the first friction plate forms a transmission connection with the clutch hub through the matching of the first external teeth and the arc groove.

[0010] In some embodiments, the first external teeth include first arc teeth and second arc teeth sequentially arranged along the circumference of the first friction plate;

[0011] The first circular arc tooth and the second circular arc tooth are both provided with the circular arc surface on one side away from the first friction plate, and an inner groove is provided between the first circular arc tooth and the second circular arc tooth;

[0012] Wherein, when the first external tooth is arranged in the circular arc groove, the circular arc surface fits the circular arc groove.

[0013] In some embodiments, the radius of the first circular arc tooth and the second circular arc tooth is equal to the radius of the circular arc groove;

[0014] The centers of the first circular arc tooth and the second circular arc tooth are arranged on the same circular arc, and the centers of the first circular arc tooth and the second circular arc tooth do not overlap.

[0015] In some embodiments, the inner groove is configured as a V-shaped groove, and the inner groove is opened at the center axis of the first outer tooth, so that the first circular arc tooth and the second circular arc tooth are symmetrically arranged relative to the inner groove.

[0016] In some embodiments, the clutch hub and the first friction plate are both annular, and when the first external tooth is disposed in the circular arc groove, the first circular arc tooth, the second circular arc tooth and the circular arc groove satisfy the following conditions:

[0017] 0.3°≤A≤0.6°, 0.3°≤B≤0.6°;

[0018] Among them, the line connecting the center of the first arc tooth and the center of the first friction plate is the first connecting line, the line connecting the center of the second arc tooth and the center of the first friction plate is the second connecting line, the line connecting the center of the arc groove and the center of the clutch hub is the third connecting line, A is the angle between the first connecting line and the third connecting line, and B is the angle between the second connecting line and the third connecting line.

[0019] In some embodiments, two adjacent arc grooves are connected by first internal teeth, and a line connecting a side of a plurality of first internal teeth away from the outer peripheral surface of the clutch hub is circular;

[0020] Two adjacent first external teeth are connected via a spline groove matching the first internal teeth.

[0021] In some embodiments, a plurality of the arc grooves are evenly arranged along the circumference of the assembly hole, and a plurality of the first external teeth are evenly arranged along the circumference of the first friction plate.

[0022] A clutch device, comprising any one of the above-mentioned clutch friction plate combination units, and further comprising:

[0023] Drive shaft;

[0024] A piston, wherein the piston is sleeved on the outer side of the driving shaft;

[0025] A clutch drum, wherein the clutch drum is sleeved on the outer side of the drive shaft and arranged opposite to the piston, and the clutch hub is rotatably sleeved on the outer sides of the piston and the clutch drum;

[0026] A second friction plate, wherein the second friction plate and the first friction plate are both provided in a plurality, the first friction plate and the second friction plate are alternately sleeved on the outer side of the clutch drum, and the second friction plate is adapted to be connected to the clutch drum through a spline;

[0027] A retaining ring, wherein the retaining ring is sleeved on the outer side of the piston, and an accommodating space is provided between the retaining ring and the clutch hub;

[0028] An elastic member, wherein the elastic member is sleeved on the outer side of the retaining ring so as to arrange the elastic member in the accommodating space, and two ends of the elastic member are respectively abutted against the retaining ring and the clutch hub;

[0029] An output shaft is disposed in the clutch drum and drivingly connected to the output shaft.

[0030] In some embodiments, a plurality of second external teeth arranged along the circumference of the clutch drum are provided on the outer peripheral side of the clutch drum, and second internal teeth are provided in the second friction plate. The second internal teeth cooperate with the second external teeth so that the clutch drum and the second friction plate are connected through a spline.

[0031] Compared with the prior art, the clutch friction plate combination unit and clutch device provided by the present application have the following beneficial effects:

[0032] 1. The present invention provides a clutch friction plate combination unit, wherein a plurality of arc grooves arranged at intervals are arranged in a clutch hub, and an arc surface matching the arc groove is arranged on a first external tooth on an outer peripheral surface of a first friction plate. On the one hand, the processing difficulty of the clutch hub and the first friction plate can be reduced, and on the other hand, the tooth profile pressure angle at the contact point between the arc groove and the arc surface can be significantly improved, thereby reducing the impact force received by the clutch hub and the first friction plate during rotational engagement, and effectively improving the bearing capacity of the clutch hub and the first friction plate. Even if the processing procedures of the combination unit are simplified, the working stability and reliability of the clutch hub and the first friction plate can be ensured. In addition, the material requirements for the clutch hub and the first friction plate can be reduced, thereby reducing costs.

[0033] 2. The present invention provides a clutch friction plate combination unit, which provides an inner groove between the first arc tooth and the second arc tooth, and the first arc tooth and the second arc tooth are symmetrically arranged relative to the inner groove, thereby avoiding too large a tooth pressure angle when the arc surface of the first outer tooth is combined with the arc groove, thereby avoiding the adverse effect of low transmission efficiency caused by excessive friction resistance at the top of the first outer tooth. Moreover, the setting of the inner groove can also improve the elasticity of the first outer tooth, further reduce the impact force when the clutch hub and the first friction plate are combined, and further improve the reliability of the combination unit.

[0034] 3. The present invention provides a clutch friction plate combination unit, wherein there is an angle A between the first connecting line and the third connecting line, and there is an angle B between the second connecting line and the third connecting line, so that the first external tooth can slide axially back and forth in the circular arc groove, thereby reducing the friction resistance between the clutch hub and the first friction plate, and reducing the possibility of jamming when the combination unit is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present application.

[0036] Figure 1 It is a schematic structural diagram of a clutch hub of a clutch friction plate combination unit provided by the present invention;

[0037] Figure 2 It is a schematic structural diagram of a first friction plate of a clutch friction plate combination unit provided by the present invention;

[0038] Figure 3 The present invention provides a schematic structural diagram of a clutch device.

[0039] Description of Figure Numbers:

[0040] Clutch hub 1, arc groove 11, assembly hole 12, first internal tooth 13;

[0041] A first friction plate 2, a first external tooth 21, a first arc tooth 211, a second arc tooth 212, an arc surface 22, an inner groove 23, and a spline groove 24;

[0042] Drive shaft 3, piston 31, clutch drum 32, second friction plate 33, retaining ring 34, elastic member 35, output shaft 36. DETAILED DESCRIPTION

[0043] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0044] In order to simplify the drawings, only the parts related to the application are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0045] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0046] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0048] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0049] In one embodiment, a clutch friction plate combination unit is described, which realizes the transmission connection between the clutch hub 1 and the first friction plate 2 by setting an arc groove 11 and a first external tooth 21, and the arc groove 11 and the first external tooth 21 cooperate with each other, thereby reducing the processing difficulty of the combination unit, enhancing the load-bearing capacity of the combination unit, and extending the service life.

[0050] It is understandable that in the existing powertrain, in order to transmit or disconnect the driving force of the engine or other prime mover to the passive body such as the wheel, it is mostly achieved through a clutch device. The clutch device is to make multiple annular flat friction plates push against or leave the same multiple annular flat clutch friction plates that are driven by the prime mover to rotate, thereby realizing the transmission or disconnection of the driving force of the prime mover to the passive body. The clutch hub and the friction plate of the existing clutch device are mostly connected by an involute spline to realize the transmission or disconnection of the driving force. However, in the prior art, the clutch hub and the friction plate mostly use the traditional involute tooth shape, which is difficult to process, time-consuming and labor-intensive, and has a weak load-bearing capacity and low reliability.

[0051] To this end, the present application provides a clutch friction plate assembly unit suitable for existing clutch devices. Figure 1 and Figure 2 In a specific embodiment, a clutch friction plate assembly unit includes a clutch hub 1 and a first friction plate 2, wherein the clutch hub 1 is provided with an assembly hole 12, and the assembly hole 12 is coaxially arranged with the clutch hub 1. A plurality of arc grooves 11 are arranged in the assembly hole 12, and the arc grooves 11 are arranged concavely toward the outer peripheral side close to the clutch hub 1, and the plurality of arc grooves 11 are arranged at intervals along the circumference of the assembly hole 12. Accordingly, a plurality of first external teeth 21 are arranged on the outer peripheral surface of the first friction plate 2, and the plurality of first external teeth 21 are arranged at intervals along the circumference of the first friction plate 2.

[0052] Accordingly, the clutch hub 1 and the first friction plate 2 match, so that the first friction plate 2 is suitable for being arranged in the assembly hole 12 of the clutch hub 1. In addition, the first external teeth 21 are provided with arc surfaces 22 that match the arc grooves 11, so that a plurality of first external teeth 21 are respectively arranged in a plurality of arc grooves 11, so that the first friction plate 2 forms a transmission connection with the clutch hub 1 through the first external teeth 21 and the arc grooves 11 matching each other.

[0053] For convenience of explanation, see the attached manual. Figure 1, the groove top of the arc groove 11 is in the shape of an arc, the radius of the arc groove 11 is set to r0, and the tooth profile pressure angle is set to α0. In the prior art, the involute internal spline tooth profile of the clutch hub is difficult to process. The gear shaping process is usually adopted in production, which has low processing efficiency, large processing units, low tooth profile accuracy, and it is difficult to achieve a high level of surface roughness, which results in the clutch not being smooth enough when engaged. Moreover, the pressure angle of the existing involute internal spline tooth profile is small, which makes it difficult to cope with the impact force of the clutch hub and the friction plate when engaged, which results in the clutch hub and the friction plate having a weak bearing capacity, and the working stability and reliability are not high. Therefore, for the existing involute internal spline tooth profile of this type, the spline needs to be subjected to quenching and hardening processes, which further increases the difficulty of processing.

[0054] In the present embodiment, the assembly hole 12 is provided with a plurality of arc grooves 11 arranged at intervals, so that the arrangement of the arc grooves 11 can be conveniently obtained by the common method of drilling, reaming and then turning the clutch hub 1. Compared with the traditional internal spline gear shaping process, it is easier to achieve higher dimensional accuracy and surface roughness, lower processing cost, lower material requirements, and lower material cost. In addition, when the arc groove 11 cooperates with the first external tooth 21, it can significantly increase the size of the tooth profile pressure angle α0. Figure 1 It can be seen that the tooth profile pressure angle at the end of the arc groove 11 is the smallest, and the tooth profile pressure angle gradually increases from the two ends of the arc groove 11 to the top of the arc groove 11. Generally speaking, the tooth profile pressure angle at the end of the arc groove 11 can generally reach 30° to 45°, and the tooth profile pressure angle at the top of the arc groove 11 can generally be close to 90°.

[0055] In one embodiment, see the attached specification Figure 2 , this embodiment further describes the first friction plate 2. The first friction plate 2 includes a first circular arc tooth 211 and a second circular arc tooth 212, which are sequentially arranged along the circumference of the first friction plate 2. Accordingly, the first circular arc tooth 211 and the second circular arc tooth 212 are both provided with a circular arc surface 22, and the circular arc surface 22 is arranged on the side of the first circular arc tooth 211 and the second circular arc tooth 212 away from the first friction surface 2. When the first outer tooth 21 is arranged in the circular arc groove 11, the circular arc surface 22 can fit with the top surface of the circular arc groove 11.

[0056] Furthermore, an inner groove 23 is provided between the first circular arc tooth 211 and the second circular arc tooth 212 , that is, the inner groove 23 can play a role in separating the first outer tooth 21 into the first circular arc tooth 211 and the second circular arc tooth 212 .

[0057] It can be understood that when the top end of the first outer tooth 21 abuts against the top end of the arc groove 11, the setting of the inner groove 23 prevents the top end of the first outer tooth 21 from contacting the top surface of the arc surface 22, thereby avoiding excessively large tooth pressure angle between the top end of the arc surface 22 and the arc groove 11, and further avoiding the adverse effect of low transmission efficiency caused by excessive friction resistance at the top of the first outer tooth 21.

[0058] In addition, it should be pointed out that the provision of the inner groove 23 can improve the elasticity of the first friction plate 2 to a certain extent, further reduce the impact force when the first friction plate 2 cooperates with the clutch hub 1, thereby further improving the reliability of the combined unit.

[0059] Preferably, the inner groove 23 is configured as a V-shaped groove, and the inner groove 23 is disposed at the center axis of the first outer tooth 21 , so that the first circular arc tooth 211 and the second circular arc tooth 212 are symmetrically disposed relative to the inner groove 23 .

[0060] Furthermore, the radii of the first arc tooth 211 and the second arc tooth 212 are equal to the radius of the arc groove 11. In addition, the centers of the first arc tooth 211 and the second arc tooth 212 are set on the same arc, and the centers of the first arc tooth 211 and the second arc tooth 212 are not arranged to overlap. In this way, when the first friction plate 2 and the clutch hub 1 are engaged, they can better fit on the entire arc surface 22, further reducing the impact force when the two are combined.

[0061] In addition, the clutch hub 1 and the first friction plate 2 are both annular. When the first external tooth 21 is disposed in the arc groove 11, the first arc tooth 211, the second arc tooth 212 and the arc groove 11 satisfy the following conditions:

[0062] 0.3°≤A≤0.6°, 0.3°≤B≤0.6°;

[0063] Among them, the line connecting the center of the first circular arc tooth 211 and the center of the first friction plate 2 is the first connecting line, the line connecting the center of the second circular arc tooth 212 and the center of the first friction plate 2 is the second connecting line, the line connecting the center of the circular arc groove 11 and the center of the clutch hub 1 is the third connecting line, A is the angle between the first connecting line and the third connecting line, and B is the angle between the second connecting line and the third connecting line. It can be understood that the setting of angle A and angle B can enable the first external tooth 21 to slide axially back and forth in the circular arc groove 11 of the clutch hub 1, thereby reducing friction resistance and reducing the possibility of jamming.

[0064] In one embodiment, see the attached specification Figure 1 and Figure 2This embodiment further describes a clutch friction plate assembly unit. The first inner teeth 13 are passed between two adjacent arc grooves 11, and the line connecting the first inner teeth 13 away from the outer peripheral surface of the clutch hub 1 is circular. Correspondingly, the adjacent two first outer teeth 21 are connected by a spline groove 24 matching the first inner teeth 13.

[0065] Furthermore, a plurality of arc grooves 11 are evenly arranged along the circumference of the assembly hole 12 , and a plurality of first external teeth 21 are evenly arranged along the circumference of the first friction plate 2 .

[0066] In one embodiment, see the attached specification Figure 3 The present embodiment provides a clutch device, including a clutch device as described in any of the above embodiments, and further including a drive shaft 3, a piston 31, a clutch drum 32, a second friction plate 33, a retaining ring 34, an elastic member 35 and an output shaft 36. The piston 31 is sleeved on the outside of the drive shaft 3, the clutch drum 32 is also sleeved on the outside of the drive shaft 3, and is arranged corresponding to the piston 31, and the clutch hub 1 of the combined unit is rotatably sleeved on the outside of the piston 31 and the clutch drum 32. A plurality of second friction plates 33 and first friction plates 2 are provided, and the first friction plates 2 and the second friction plates 33 are alternately sleeved on the outside of the clutch drum 32 in sequence along the extension direction of the clutch drum 32. In addition, the second friction plates 33 and the clutch drum 32 are suitable for being connected by splines.

[0067] Furthermore, the retaining ring 34 is sleeved on the outer side of the piston 31 and is arranged between the piston 31 and the clutch hub 1. An accommodating space is arranged between the piston 31 and the clutch hub 1. The elastic member 35 is arranged in the accommodating space and sleeved on the outer side of the retaining ring 34. Both ends of the elastic member 35 are respectively abutted on the retaining ring 34 and the clutch hub 1. In addition, the output shaft 36 is arranged in the clutch drum 32 and is transmission-connected with the output shaft 36.

[0068] Generally speaking, a step portion is provided on the retaining ring 34, so that the elastic member 35 is sleeved on one end of the retaining ring 34 and abuts on the step portion. Accordingly, the output shaft 36 and the clutch drum 32 can be connected through a planetary gear transmission. In addition, the outer peripheral side of the clutch drum 32 is provided with a plurality of second external teeth arranged along the circumference of the clutch drum 32, and the second friction plate 33 is provided with second internal teeth, and the second internal teeth cooperate with the second external teeth, so that the clutch drum 32 and the second friction plate 33 are connected through a spline.

[0069] When oil is controlled to flow into the oil circuit of the clutch device, the piston 31 is pushed to compress the elastic member 35, so that the first friction plate 2 and the second friction plate 33 are pressed tightly. Since the second friction plate 33 is connected to the clutch drum 32 by a spline, the first outer tooth 21 of the first friction plate 2 is embedded in the circular arc groove 11 of the clutch hub 1, so that the first friction plate 2, the second friction plate 33, the clutch drum 32 and the clutch hub 1 are pressed and joined as a whole, and the power transmission between the drive shaft 3 and the output shaft 36 is realized in a fixed manner.

[0070] Correspondingly, when the oil circuit controlling the clutch device stops supplying oil, the piston 31 returns to its original position under the action of the restoring force of the elastic member 35, so that the first friction plate 2, the second friction plate 33, the clutch drum 32 and the clutch hub 1 are loosened, so that the power of the drive shaft 3 cannot be transmitted to the output shaft 36, thereby realizing power interruption of the drive shaft 3 and the output shaft 36.

[0071] It can be understood that the clutch hub 1 and the first friction plate 2 in the clutch device provided in this embodiment are connected through the arc groove 11 and the first external tooth 21, which can effectively reduce the processing difficulty of the clutch device, improve the load-bearing capacity and reliability of the clutch device, and extend the service life.

[0072] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A clutch friction plate assembly unit, characterized in that: include: A clutch hub, wherein the clutch hub is provided with an assembly hole coaxially arranged with the clutch hub, wherein a plurality of circular arc grooves are arranged in the assembly hole, and the plurality of circular arc grooves are arranged at intervals along the circumference of the assembly hole; A first friction plate, wherein a plurality of first external teeth are arranged on an outer peripheral surface of the first friction plate, and the plurality of first external teeth are arranged at intervals along the circumference of the first friction plate; Among them, the first external teeth are provided with an arc surface matching with the arc groove, so that a plurality of the first external teeth are respectively arranged in the arc groove, so that the first friction plate forms a transmission connection with the clutch hub through the matching of the first external teeth and the arc groove.

2. A clutch friction plate assembly unit according to claim 1, characterized in that: The first external teeth include first arc teeth and second arc teeth sequentially arranged along the circumference of the first friction plate; The first circular arc tooth and the second circular arc tooth are both provided with the circular arc surface on one side away from the first friction plate, and an inner groove is provided between the first circular arc tooth and the second circular arc tooth; Wherein, when the first external tooth is arranged in the circular arc groove, the circular arc surface fits the circular arc groove.

3. A clutch friction plate assembly unit according to claim 2, characterized in that: The radius of the first circular arc tooth and the second circular arc tooth is equal to the radius of the circular arc groove; The centers of the first circular arc tooth and the second circular arc tooth are arranged on the same circular arc, and the centers of the first circular arc tooth and the second circular arc tooth do not overlap.

4. A clutch friction plate assembly unit according to claim 3, characterized in that: The inner groove is configured as a V-shaped groove, and the inner groove is opened at the center axis of the first outer tooth, so that the first circular arc tooth and the second circular arc tooth are symmetrically arranged relative to the inner groove.

5. A clutch friction plate assembly unit according to claim 4, characterized in that: The clutch hub and the first friction plate are both in an annular shape. When the first external tooth is arranged in the arc groove, the first arc tooth, the second arc tooth and the arc groove meet the following conditions: 0.3°≤A≤0.6°, 0.3°≤B≤0.6°; Among them, the line connecting the center of the first arc tooth and the center of the first friction plate is the first connecting line, the line connecting the center of the second arc tooth and the center of the first friction plate is the second connecting line, the line connecting the center of the arc groove and the center of the clutch hub is the third connecting line, A is the angle between the first connecting line and the third connecting line, and B is the angle between the second connecting line and the third connecting line.

6. A clutch friction plate assembly unit according to any one of claims 1 to 5, characterized in that: Two adjacent arc grooves are connected by first internal teeth, and a line connecting a plurality of first internal teeth away from the outer peripheral surface of the clutch hub is circular; Two adjacent first external teeth are connected via a spline groove matching the first internal teeth.

7. A clutch friction plate assembly unit according to claim 6, characterized in that: A plurality of the arc grooves are evenly arranged along the circumference of the assembly hole, and a plurality of the first external teeth are evenly arranged along the circumference of the first friction plate.

8. A clutch device, characterized in that: A clutch friction plate assembly unit comprising any one of claims 1 to 7, further comprising: Drive shaft; A piston, wherein the piston is sleeved on the outer side of the driving shaft; A clutch drum, wherein the clutch drum is sleeved on the outside of the drive shaft and arranged opposite to the piston, and the clutch hub is rotatably sleeved on the outside of the piston and the clutch drum; A second friction plate, wherein the second friction plate and the first friction plate are both provided in a plurality, the first friction plate and the second friction plate are alternately sleeved on the outer side of the clutch drum, and the second friction plate is adapted to be connected to the clutch drum through a spline; A retaining ring, wherein the retaining ring is sleeved on the outer side of the piston, and an accommodating space is provided between the retaining ring and the clutch hub; An elastic member, wherein the elastic member is sleeved on the outer side of the retaining ring so as to arrange the elastic member in the accommodating space, and two ends of the elastic member are respectively abutted against the retaining ring and the clutch hub; An output shaft is disposed in the clutch drum and drivingly connected to the output shaft.

9. A clutch device according to claim 8, characterized in that: The outer peripheral side of the clutch drum is provided with a plurality of second external teeth arranged along the circumference of the clutch drum, and the second friction plate is provided with second internal teeth, and the second internal teeth cooperate with the second external teeth so that the clutch drum and the second friction plate are connected through splines.

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