Electromagnetic clutch

Abstract

The invention provides an electromagnetic clutch. The electromagnetic clutch comprises a push ring, a cam, a bracket, a power device, an input wheel, an output wheel assembly, a first elastic piece and a second elastic piece. A limiting groove is formed in the push ring, and the cam is movably arranged in the limiting groove; a stop pin is arranged on the bracket and is rotationally connected with the cam; the power device is connected with the push ring and used for pushing the push ring to move in the axial direction. The input wheel is provided with first teeth, the output wheel assembly is provided with second teeth, and the second teeth are used for being meshed with the first teeth. The two ends of the first elastic piece abut against the push ring and the input wheel respectively. The two ends of the second elastic piece abut against the input wheel and the output wheel assembly respectively. When the clutch is kept in the closed or open state, the power device of the clutch does not need to be powered on to be started, the stable closed or open state can be kept through cooperation of a mechanical structure, and therefore energy consumption is effectively reduced.

Description

Technical Field

[0001] This application relates to the technical field of clutches, and particularly to an electromagnetic clutch. Background Art

[0002] A clutch is a device that transfers the engine power of an automobile or other power machinery to the axle in a switched manner. The clutch can be opened or closed by controlling an electromagnetic valve. However, existing clutches require the electromagnetic valve to continuously supply power to maintain the open or closed state, which means that the electromagnetic valve needs to continuously consume energy, and is not conducive to energy conservation. Summary of the Invention

[0003] The purpose of this application is to provide an electromagnetic clutch to solve the problem in the above-mentioned prior art that the electromagnetic valve needs to continuously consume energy to maintain the open or closed state of the clutch, resulting in continuous energy consumption.

[0004] This application provides an electromagnetic clutch, which includes:

[0005] A push ring, on which a limiting groove is provided;

[0006] A cam, which is movably arranged in the limiting groove;

[0007] A bracket, on which a stop pin is provided, and the stop pin is rotatably connected to the cam;

[0008] A power device, connected to the push ring, for pushing the push ring to move axially;

[0009] An input wheel, on which a first tooth is provided;

[0010] An output wheel assembly, on which a second tooth is provided, and the second tooth is used for meshing with the first tooth;

[0011] A first elastic member, with both ends respectively abutted against the push ring and the input wheel;

[0012] A second elastic member, with both ends respectively abutted against the input wheel and the output wheel assembly.

[0013] In a possible design, a first clamping groove is provided on the inner wall of the limiting groove close to the input wheel side. In the state where the first tooth and the second tooth are separated, one end of the cam is clamped in the first clamping groove.

[0014] In a possible design, a second card slot is provided on an inner wall of the limiting slot close to the input wheel, and a third card slot is provided on an inner wall of the limiting slot far from the input wheel. The second card slot is located between the first card slot and the third card slot.

[0015] The cam is provided with a first end and a second end, and the first end and the second end are respectively located on two sides of the stop pin.

[0016] When the first tooth and the second tooth are in the first meshing position, the second end is clamped in the third card slot so that the cam rotates to a preset angle.

[0017] When the first tooth and the second tooth are in the second meshing position, the first end is clamped in the second card slot.

[0018] In a possible design, a first limiting plane is provided on an inner side wall of the bracket, and a second limiting plane is provided on an outer side wall of the push ring. The bracket is sleeved on the push ring, and the first limiting plane is aligned with the second limiting plane.

[0019] In a possible design, the limiting slot is located on the second limiting plane, and a fixing hole is provided on the bracket. The fixing hole penetrates through the first limiting plane.

[0020] One end of the stop pin is arranged in the fixing hole, and the other end of the stop pin extends out of the fixing hole and is rotatably connected with the cam.

[0021] In a possible design, a rotating hole is provided on the cam, and the cam is rotatably connected with the stop pin through the rotating hole.

[0022] In a possible design, the stiffness of the first elastic member is greater than the stiffness of the second elastic member.

[0023] In a possible design, the power device includes an electromagnetic coil and a piston. The piston is movably arranged in the electromagnetic coil, and the piston is connected with the push ring.

[0024] In a possible design, a first bearing is further included. The first bearing is sleeved on the push ring, and the piston abuts against the first bearing.

[0025] In a possible design, the output wheel assembly includes an output wheel and a second bearing. An installation hole is provided on the output wheel, and the second bearing is fixedly embedded in the installation hole. One end of the second elastic member abuts against the second bearing.

[0026] The technical solution provided by this application can achieve the following beneficial effects:

[0027] For the electromagnetic clutch provided by this application, when maintaining the closed or open state, the power device of the clutch does not need to be energized and started, and can maintain a stable closed or open state through the cooperation of the mechanical structure, thus effectively reducing energy consumption.

[0028] It should be understood that the above general description and the following detailed description are only exemplary and do not limit this application. Description of the Drawings

[0029] Figure 1 Is the exploded view of the electromagnetic clutch provided by the embodiment of this application;

[0030] Figure 2 Is the side view of the electromagnetic clutch provided by the embodiment of this application;

[0031] Figure 3 Is the schematic diagram of the electromagnetic clutch provided by the embodiment of this application in the first state;

[0032] Figure 4 Is the schematic diagram of the cooperation between the cam and the limit groove provided by the embodiment of this application in the first state;

[0033] Figure 5 Is the schematic diagram of the electromagnetic clutch provided by the embodiment of this application in the second state;

[0034] Figure 6 Is the schematic diagram of the cooperation between the cam and the limit groove provided by the embodiment of this application in the second state;

[0035] Figure 7 Is the schematic diagram of the electromagnetic clutch provided by the embodiment of this application in the third state;

[0036] Figure 8 Is another schematic diagram of the cooperation between the cam and the limit groove provided by the embodiment of this application in the third state;

[0037] Figure 9 Is the schematic diagram of the electromagnetic clutch provided by the embodiment of this application in the fourth state;

[0038] Figure 10 Is the schematic diagram of the cooperation between the cam and the limit groove provided by the embodiment of this application in the fourth state;

[0039] Figure 11 Is the schematic diagram of the electromagnetic clutch provided by the embodiment of this application in the fifth state;

[0040] Figure 12 Is the schematic diagram of the cooperation between the cam and the limit groove provided by the embodiment of this application in the fifth state;

[0041] Figure 13 Schematic diagram of the electromagnetic clutch provided by the embodiment of the present application in the sixth state;

[0042] Figure 14 Schematic diagram of the cooperation between the cam and the limiting groove provided by the embodiment of the present application in the sixth state;

[0043] Figure 15 Schematic diagram of the electromagnetic clutch provided by the embodiment of the present application in the seventh state;

[0044] Figure 16 Schematic diagram of the cooperation between the cam and the limiting groove provided by the embodiment of the present application in the seventh state;

[0045] Figure 17 Schematic diagram of the electromagnetic clutch provided by the embodiment of the present application in the eighth state;

[0046] Figure 18 Schematic diagram of the cooperation between the cam and the limiting groove provided by the embodiment of the present application in the eighth state;

[0047] Figure 19 Schematic diagram of the electromagnetic clutch provided by the embodiment of the present application in the ninth state;

[0048] Figure 20 Schematic diagram of the cooperation between the cam and the limiting groove provided by the embodiment of the present application in the ninth state;

[0049] Figure 21 Schematic diagram of the electromagnetic clutch provided by the embodiment of the present application in the ninth state;

[0050] Figure 22 Schematic diagram of the cooperation between the cam and the limiting groove provided by the embodiment of the present application in the ninth state;

[0051] Figure 23 Top view of the limiting groove.

[0052] Explanation of reference numerals:

[0053] 1 - Pushing ring;

[0054] 11 - Limiting groove;

[0055] 111 - First card slot;

[0056] 112 - Second card slot;

[0057] 113 - Third card slot;

[0058] 12 - Second limiting plane;

[0059] 2 - Cam;

[0060] 21 - First end;

[0061] 22 - Second end;

[0062] 3 - Bracket;

[0063] 31 - Stop pin;

[0064] 32 - Snap ring;

[0065] 33 - Fixing hole;

[0066] 4 - Power device;

[0067] 41 - Electromagnetic coil;

[0068] 42 - Piston;

[0069] 5 - Input wheel;

[0070] 51 - First tooth;

[0071] 52 - Protrusion;

[0072] 6 - Output wheel assembly;

[0073] 61 - Output wheel;

[0074] 611 - Second tooth;

[0075] 62 - Second bearing;

[0076] 621 - Snap ring;

[0077] 7 - First elastic member;

[0078] 8 - Second elastic member;

[0079] 9 - First bearing;

[0080] A - First position;

[0081] B - Second position.

[0082] The accompanying drawings here are incorporated into and constitute a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application. Detailed implementation manners

[0083] In order to make the objectives, technical solutions, and advantages of this application clearer, the following further details this application in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this application and are not used to limit this application.

[0084] In the description of the present application, unless otherwise clearly specified and defined, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; unless otherwise specified or stated, the term "plurality" means two or more; the terms "connection", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0085] In the description of this specification, it should be understood that the orientation terms such as "upper" and "lower" described in the embodiments of the present application are described from the angles shown in the drawings and should not be construed as a limitation on the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that one component is connected "above" or "below" another component, it can not only be directly connected "above" or "below" another component, but also be indirectly connected "above" or "below" another component through an intermediate component.

[0086] Figure 1 It is an exploded view of the electromagnetic clutch provided by the embodiment of the present application. Figure 2 It is a side view of the electromagnetic clutch provided by the embodiment of the present application. Referring to Figure 1 and Figure 2 , the embodiment of the present application provides an electromagnetic clutch, hereinafter referred to as the clutch, which includes a push ring 1, a cam 2, a bracket 3, a power device 4, an input wheel 5, an output wheel assembly 6, a first elastic member 7 and a second elastic member 8. A limiting groove 11 is provided on the push ring 1, and the cam 2 is movably arranged in the limiting groove 11; a stop pin 31 is provided on the bracket 3, and the stop pin 31 is rotatably connected to the cam 2; the power device 4 is connected to the push ring 1 and is used to push the push ring 1 to move axially; a first tooth 51 is provided on the input wheel 5, and a second tooth 611 is provided on the output wheel assembly 6, and the second tooth 611 is used to engage with the first tooth 51; both ends of the first elastic member 7 are respectively abutted against the push ring 1 and the input wheel 5; both ends of the second elastic member 8 are respectively abutted against the input wheel 5 and the output wheel assembly 6.

[0087] Among them, this clutch can be applied to the gearbox of an automobile and can specifically be sleeved on the drive shaft. In this embodiment, a spline is provided on the input wheel 5, and the input wheel 5 can be sleeved on the drive shaft through the spline. The input wheel 5 can slide axially along the drive shaft. In the circumferential direction of the drive shaft, due to the constraint of the spline, the input wheel 5 will not rotate relative to the drive shaft and can rotate synchronously with the drive shaft under the drive of the drive shaft.

[0088] The output wheel assembly 6 is also sleeved on the drive shaft. The output wheel assembly 6 cannot move axially on the drive shaft but can rotate relative to the drive shaft. When the first tooth 51 of the input wheel 5 meshes with the second tooth 611 of the output wheel assembly 6, the power of the input wheel 5 can be transmitted to the output wheel assembly 6, causing the drive shaft, the input wheel 5, and the output wheel assembly 6 to move synchronously.

[0089] The bracket 3 can be fastened to the drive shaft, and a snap ring 32 can be used to achieve axial limit to prevent the bracket 3 from moving axially on the drive shaft. Among them, the stop pin 31 is fixed on the bracket 3 and can remain relatively stationary with the bracket 3. Constrained by the stop pin 31, the cam 2 will not move axially either, but can rotate around the stop pin 31 as the rotation center. The push ring 1 can move axially relative to the bracket 3. When the push ring 1 moves to certain positions, the cam 2 can be rotated by the contact between the inner side wall of the limit groove 11 and the cam 2, and the cam 2 can be clamped at a preset position in the limit groove 11. Among them, the force for the movement of the push ring 1 can come from the power device 4.

[0090] The input wheel 5 can have a protrusion 52. The push ring 1 can be sleeved on the protrusion 52. The protrusion 52 has a certain length, providing a certain circumferential movement space for the push ring 1. At the same time, it is also convenient to arrange the first elastic member 7 between the push ring 1 and the input wheel 5. In one embodiment, the first elastic member 7 can be a wave spring. Both ends of the wave spring can respectively abut against the push ring 1 and the input wheel 5. The wave spring can maintain a compressed state and can provide a certain elastic force to the push ring 1 and the input wheel 5. In one embodiment, the second elastic member 8 can be a wire spring. Both ends of the wire spring can respectively abut against the input wheel 5 and the output wheel assembly 6, and can provide a force for the automatic separation of the input wheel 5 and the output wheel assembly 6.

[0091] Figure 3 It is a schematic diagram of the electromagnetic clutch provided by the embodiment of the present application in the first state. Figure 3 It shows that the clutch is in the open state. Figure 4 It is a schematic diagram of the cooperation between the cam 2 and the limit groove 11 in the first state provided by the embodiment of the present application. Referring to Figure 3 and Figure 4 , when the clutch is in the open state, the first tooth 51 of the input wheel 5 and the second tooth 611 of the output wheel assembly 6 are separated. The push ring 1 is located at the initial position away from the input wheel 5. The first position A on the inner wall of the limit groove 11 close to the input wheel 5 can contact the cam 2. At the same time, the elastic forces provided by the first elastic member 7 and the second elastic member 8 can ensure the stability of the push ring 1 at the initial position.

[0092] When it is necessary to switch the clutch from the open state to the closed state, that is, when it is necessary to engage the input wheel 5 with the output wheel assembly 6, the power device 4 can be energized to start, providing a driving force to the push ring 1 to push the push ring 1 to move in the direction of the input wheel 5. Exemplarily, Figure 5 Schematic diagram of the electromagnetic clutch provided by the embodiment of the present application in the second state, Figure 6 Schematic diagram of the cooperation between the cam 2 and the limiting groove 11 provided by the embodiment of the present application in the second state, Figure 5 and Figure 6 shows a certain state during the movement of the push ring 1 towards the input wheel 5, where the cam 2 does not contact the inner wall of the limiting groove 11.

[0093] As the push ring 1 continues to move towards the input wheel 5, the inner wall of the limiting groove 11 on the side away from the input wheel 5 can contact the cam 2. Exemplarily, Figure 7 Schematic diagram of the electromagnetic clutch provided by the embodiment of the present application in the third state, Figure 8 Another schematic diagram of the cooperation between the cam 2 and the limiting groove 11 provided by the embodiment of the present application in the third state, Figure 7 and Figure 8 In the state shown, the inner wall of the limiting groove 11 on the side away from the input wheel 5 contacts the cam 2.

[0094] Figure 9 Schematic diagram of the electromagnetic clutch provided by the embodiment of the present application in the fourth state, Figure 10 Schematic diagram of the cooperation between the cam 2 and the limiting groove 11 provided by the embodiment of the present application in the fourth state. In Figure 9 and Figure 10 In the state shown, the end of the cam 2 away from the input wheel 5 contacts the inner wall of the limiting groove 11, and the first elastic member 7 is compressed to the maximum compression state. Referring to Figure 9 and Figure 10 , when the push ring 1 moves to the position where the first tooth 51 and the second tooth 611 are fully engaged, for the sake of convenience of description, in this embodiment, it is defined that the position where the first tooth 51 and the second tooth 611 of the clutch are fully engaged is the first engagement position. At the first engagement position, the push ring 1 moves the maximum displacement in the direction of the input wheel 5, both the first elastic member 7 and the second elastic member 8 are compressed, the inner wall of the limiting groove 11 on the side away from the input wheel 5 contacts the cam 2, and can cause the cam 2 to rotate through a certain angle. At this time, at the above-mentioned first engagement position, the positions of the push ring 1 and the input wheel 5 are not stable positions.

[0095] Figure 11 Schematic diagram of the cooperation between the cam 2 and the limiting groove 11 provided by the embodiment of the present application in the fifth state, Figure 12 Schematic diagram of the electromagnetic clutch provided by the embodiment of the present application in the fifth state. Referring to Figure 11 andFigure 12 After the push ring 1 moves in the direction of the input wheel 5 by the maximum displacement, the power device 4 can be powered off and stopped. At this time, the compressed first elastic member 7 gradually recovers its elastic deformation, and the push ring 1 moves towards the side away from the input wheel 5. In addition, Figure 13 is a schematic diagram of the electromagnetic clutch provided by the embodiment of the present application in the sixth state, Figure 14 is a schematic diagram of the cooperation between the cam 2 and the limiting groove 11 provided by the embodiment of the present application in the sixth state. Refer to Figure 13 and Figure 14 , during this process, the first elastic member 7 recovers part of its elastic deformation, so that the second position B on the side wall of the limiting groove 11 close to the input wheel 5 contacts and limits the cam 2. Through the limitation of the second position B with the cam 2, the movement of the push ring 1 towards the side away from the input wheel 5 can be avoided, so that the position of the push ring 1 can be locked, and the meshing state of the first tooth 51 and the second tooth 611 can be ensured, that is, the clutch can be kept in a closed state. That is to say, when the clutch in this embodiment is kept in a closed state, the power device 4 of the clutch does not need to be powered on and started, and the stable closed state can be maintained through the cooperation of the above mechanical structures, thereby effectively reducing energy consumption.

[0096] When it is necessary to switch the clutch from the Figure 13 and Figure 14 shown closed state to the open state, that is, when it is necessary to separate the meshing input wheel 5 and the output wheel assembly 6, the power device 4 can be powered on and started to provide a driving force for the push ring 1 to push the push ring 1 to move in the direction of the input wheel 5. Figure 15 is a schematic diagram of the electromagnetic clutch provided by the embodiment of the present application in the seventh state, Figure 16 is a schematic diagram of the cooperation between the cam 2 and the limiting groove 11 provided by the embodiment of the present application in the sixth state. Refer to Figure 15 and Figure 16 , when the push ring 1 starts to move towards the side of the input wheel 5, the limiting groove 11 is first separated from the cam 2.

[0097] Figure 17 is a schematic diagram of the electromagnetic clutch provided by the embodiment of the present application in the eighth state, Figure 18 is a schematic diagram of the cooperation between the cam 2 and the limiting groove 11 provided by the embodiment of the present application in the eighth state. Refer to Figure 17 and Figure 18, as the pushing ring 1 continues to move towards the input wheel 5, the inner wall of the limiting groove 11 on the side away from the input wheel 5 can contact the cam 2. Among them, the first elastic member 7 simultaneously separates from the second position B on the inner side wall of the limiting groove 11 near the input wheel 5, so as to cancel the locking state between the second position B on the inner side wall of the limiting groove 11 and the cam 2. As the pushing ring 1 continues to move, the inner side wall of the limiting groove 11 on the side away from the input wheel 5 can contact the cam 2 and can cause the cam 2 to rotate through a certain angle.

[0098] Figure 19 Schematic diagram of the electromagnetic clutch provided by the embodiment of the present application in the ninth state, Figure 20 Schematic diagram of the cooperation between the cam 2 and the limiting groove 11 provided by the embodiment of the present application in the ninth state. Refer to Figure 19 and Figure 20 , after the inner side wall of the limiting groove 11 on the side away from the input wheel 5 contacts the cam 2, the power device 4 can be powered off and stopped. At this time, the first elastic member 7 and the second elastic member 8 recover their elastic deformations. The elastic force provided by the second elastic member 8 can push the input wheel 5 to move away from the output wheel assembly 6, and the first elastic member 7 can push the pushing ring 1 to move away from the input wheel 5. During this process, the inner side wall of the limiting groove 11 near the input wheel 5 can initially contact the cam 2.

[0099] Figure 21 Schematic diagram of the electromagnetic clutch provided by the embodiment of the present application in the ninth state, Figure 22 Schematic diagram of the cooperation between the cam 2 and the limiting groove 11 provided by the embodiment of the present application in the ninth state. Refer to Figure 21 and Figure 22 , as the pushing ring 1 continues to move towards the side away from the input wheel 5, the limiting groove 11 can push one end of the cam 2, causing the cam 2 to rotate through a certain angle. When the pushing ring 1 moves to the Figure 3 and Figure 4 shown initial position, the cam 2 can contact and limit the inner side wall of the limiting groove 11 to prevent the pushing ring 1 from continuing to move away from the input wheel 5. At this time, the separation of the input wheel 5 and the output wheel assembly 6 is realized, that is, the opening of the clutch is realized. Thus, in the open state of the clutch in this embodiment, the power device 4 of the clutch does not need to be powered on and started, and the stable open state can be maintained through the cooperation of the above mechanical structure, thereby effectively reducing energy consumption.

[0100] In one embodiment, Figure 23 Top view of the limiting groove 11. Refer to Figure 23 , a first card slot 111 is provided on the inner wall of the limiting groove 11 near the input wheel 5. In the separated state of the first tooth 51 and the second tooth 611, one end of the cam 2 is clamped in the first card slot 111.

[0101] The first card slot 111 is located at the aforementioned Figure 4 The first position A on the limit groove 11 shown, that is, when the cam 2 is engaged with the first engaging groove 111, the push ring 1 is in the initial position away from the input wheel 5, and the clutch is in the open state at this time. The engagement of the cam 2 with the first engaging groove 111 can ensure that the clutch maintains a stable open state.

[0102] In one embodiment, referring to Figure 23 A second slot 112 is provided on the inner wall of the limiting groove 11 close to the input wheel 5, and a third slot 113 is provided on the inner wall of the limiting groove 11 away from the input wheel 5. The second slot 112 is located between the first slot 111 and the third slot 113. The second slot 112 is located at the position of the aforementioned Figure 14 The second position B on the limiting groove 11 is shown.

[0103] Reference Figure 4 The cam 2 is provided with a first end 21 and a second end 22, and the first end 21 and the second end 22 are respectively located on both sides of the stop pin 31. When the clutch is in the open state, the first end 21 of the cam 2 is engaged in the first engagement groove 111. Figure 8 When the first tooth 51 and the second tooth 611 are at the first meshing position, that is, when the first tooth 51 and the second tooth 611 are fully meshed, the second end 22 of the cam 2 is engaged in the third slot 113, so that the cam 2 rotates to a preset angle. Figure 14 When the first tooth 51 and the second tooth 611 are in the second meshing position, that is, when the first tooth 51 and the second tooth 611 are partially meshed, the first end 21 of the cam 2 is engaged in the second slot 112 to lock the position of the push ring 1. At this time, even if the power device 4 provides a driving force to the push ring 1, the push ring 1 will not move, thereby ensuring the stability of the meshing state of the input wheel 5 and the output wheel assembly 6.

[0104] In one embodiment, a first limiting plane (not shown in the figure) is provided on the inner side wall of the bracket 3. Figure 1 A second limiting plane 12 is provided on the outer side wall of the push ring 1 , the bracket 3 is sleeved on the push ring 1 , and the first limiting plane is aligned with the second limiting plane 12 .

[0105] The cooperation between the first limiting plane and the second limiting plane 12 can prevent the push ring 1 from rotating relative to the bracket 3 , thereby ensuring that the cam 2 moves stably in the limiting groove 11 through the stop pin 31 on the bracket 3 .

[0106] In one embodiment, referring to Figure 1The limiting groove 11 is located on the second limiting plane 12. A fixing hole 33 is provided on the bracket 3, and the fixing hole 33 penetrates through the first limiting plane. One end of the stop pin 31 is arranged in the fixing hole 33, and the other end of the stop pin 31 extends out of the fixing hole 33 and is rotatably connected to the cam 2.

[0107] Among them, by matching the stop pin 31 with the fixing hole 33, the assembly of the stop pin 31 can be facilitated. In one embodiment, the stop pin 31 can be fixed in the fixing hole 33 by an interference fit. One end of the stop pin 31 extending out of the fixing hole 33 can be partially located in the limiting groove 11 to facilitate the rotational connection with the cam 2 in the limiting groove 11.

[0108] In one embodiment, a rotating hole is provided on the cam 2, and the cam 2 is rotatably connected to the stop pin 31 through the rotating hole.

[0109] Among them, the inner diameter of the rotating hole is slightly larger than the diameter of the stop pin 31, and a partial part of the stop pin 31 can extend into the rotating hole, so that the cam 2 can rotate around the stop pin 31 as the rotation center and the axial movement of the cam 2 can be restricted. Among them, the stop pin 31 can extend into a part of the rotating hole without contacting the ground of the limiting groove 11, so as to avoid generating frictional resistance between the stop pin 31 and the push ring 1.

[0110] In one embodiment, the stiffness of the first elastic member 7 is much greater than the stiffness of the second elastic member 8, that is, when the first elastic member 7 and the second elastic member 8 are subjected to the same force, the second elastic member 8 is relatively more likely to undergo elastic deformation. Among them, in the process of switching the clutch from the open state to the closed state, the push ring 1 can push the input wheel 5 towards the side where the output wheel assembly 6 is located through the first elastic member 7, and can make the second elastic member 8 have a relatively large compression amount, so that the first tooth 51 on the input wheel 5 is completely engaged with the second tooth 611 on the output wheel assembly 6. Then, as the push ring 1 continues to move towards the side of the input wheel 5, the first elastic member 7 can be further compressed, so that after the inner wall of the limiting groove 11 away from the input wheel 5 contacts the cam 2, the cam 2 rotates by a certain angle to facilitate the subsequent engagement of the cam 2 with the second card slot 112.

[0111] In one embodiment, referring to Figure 1 , the power device 4 includes an electromagnetic coil 41 and a piston 42. The piston 42 is movably arranged in the electromagnetic coil 41, and the piston 42 is connected to the push ring 1. Among them, when the electromagnetic coil 41 is energized, a magnetic field can be generated inside, so as to drive the axial movement of the piston 42 and further push the push ring 1 to move through the piston 42.

[0112] In one embodiment, referring to Figure 1, the clutch further includes a first bearing 9 sleeved on the push ring 1, and the piston 42 abuts against the first bearing 9. Wherein, the first bearing 9 can be a thrust needle bearing which has rollable needle rollers. The piston 42 can contact the needle rollers, and the relative rotation movement between the piston 42 and the push ring 1 can be absorbed through the movement of the needle rollers. At the same time, the thrust needle bearing has a good force-bearing effect in the axial direction, which is convenient to push the push ring 1 to move through the thrust needle bearing.

[0113] In one embodiment, referring to Figure 1 , the output wheel assembly 6 can include an output wheel 61 and a second bearing 62. An installation hole is provided on the output wheel 61, and the second bearing 62 is fixedly embedded in the installation hole. One end of the second elastic member 8 abuts against the second bearing 62.

[0114] Wherein, the second bearing 62 can be used to mount the output wheel 61 on the drive shaft, prevent the output wheel 61 from axially moving on the drive shaft, enable the output wheel 61 to rotate relative to the drive shaft, and can also axially limit the second elastic member 8. Exemplarily, a snap ring 621 can be provided on the second bearing 62 to achieve axial limitation through the snap ring 621.

[0115] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electromagnetic clutch, characterized in that, comprising: a push ring (1) provided with a limiting groove (11) thereon; a cam (2) movably disposed in the limiting groove (11); a bracket (3) provided with a stop pin (31) thereon, and the stop pin (31) is rotatably connected to the cam (2); a power device (4) connected to the push ring (1) for pushing the push ring (1) to move axially; an input wheel (5) provided with a first tooth (51) thereon; an output wheel assembly (6) provided with a second tooth (611) thereon, and the second tooth (611) is used for meshing with the first tooth (51); a first elastic member (7) with two ends respectively abutted against the push ring (1) and the input wheel (5); a second elastic member (8) with two ends respectively abutted against the input wheel (5) and the output wheel assembly (6).

2. The electromagnetic clutch according to claim 1, characterized in that, a first clamping groove (111) is provided on an inner wall of the limiting groove (11) on a side close to the input wheel (5), and one end of the cam (2) is clamped in the first clamping groove (111) in a state where the first tooth (51) and the second tooth (611) are separated.

3. The electromagnetic clutch according to claim 2, characterized in that, a second clamping groove (112) is provided on an inner wall of the limiting groove (11) on a side close to the input wheel (5), and a third clamping groove (113) is provided on an inner wall of the limiting groove (11) on a side far from the input wheel (5), and the second clamping groove (112) is located between the first clamping groove (111) and the third clamping groove (113); the cam (2) is provided with a first end (21) and a second end (22), and the first end (21) and the second end (22) are respectively located on both sides of the stop pin (31); when the first tooth (51) and the second tooth (611) are at a first meshing position, the second end (22) is clamped in the third clamping groove (113) to rotate the cam (2) to a preset angle; when the first tooth (51) and the second tooth (611) are at a second meshing position, the first end (21) is clamped in the second clamping groove (112).

4. The electromagnetic clutch according to any one of claims 1-3, characterized in that, a first limiting plane is provided on an inner side wall of the bracket (3), a second limiting plane (12) is provided on an outer side wall of the push ring (1), the bracket (3) is sleeved on the push ring (1), and the first limiting plane is aligned with the second limiting plane (12).

5. The electromagnetic clutch according to claim 4, characterized in that, the limiting groove (11) is located on the second limiting plane (12), and the bracket (3) is provided with a fixing hole which penetrates through the first limiting plane; One end of the stop pin (31) is disposed in the fixing hole, and the other end of the stop pin (31) extends out of the fixing hole and is rotatably connected to the cam (2).

6. The electromagnetic clutch according to claim 5, wherein, a rotation hole is provided on the cam (2), and the cam (2) is rotatably connected to the stop pin (31) through the rotation hole.

7. The electromagnetic clutch according to any one of claims 1-3, wherein, the stiffness of the first elastic member (7) is greater than the stiffness of the second elastic member (8).

8. The electromagnetic clutch according to any one of claims 1-3, wherein, the power device (4) includes an electromagnetic coil (41) and a piston (42), the piston (42) is movably disposed in the electromagnetic coil (41), and the piston (42) is connected to the push ring (1).

9. The electromagnetic clutch according to claim 8, wherein, it further includes a first bearing (9), the first bearing (9) is sleeved on the push ring (1), and the piston (42) abuts against the first bearing (9).

10. The electromagnetic clutch according to any one of claims 1-3, wherein, the output wheel assembly (6) includes an output wheel (61) and a second bearing (62), a mounting hole is provided on the output wheel (61), the second bearing (62) is fixedly embedded in the mounting hole, and one end of the second elastic member (8) abuts against the second bearing (62).

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