Electromagnetic clutch

Abstract

The utility model provides an electromagnetic clutch, which relates to the technical field of automobile clutches, and comprises a coil assembly, an armature sleeve, an armature pressure plate, an output hub, a driving claw disc, a spring and a driven claw disc which are coaxially arranged, the armature sleeve is installed on the coil assembly. The armature pressure plate is mounted on the armature sleeve; the armature pressing disc and the driving claw disc are both arranged on the left portion of the output hub in an axial moving and sleeving mode, the armature pressing disc and the driving claw disc are both in circumferential transmission with the output hub, and the driving claw disc is located on the right side of the armature pressing disc. And under the action of the spring, the driving claw disc is propped against the armature pressing disc. The electromagnetic clutch has the advantages that the electromagnetic clutch integrates module design and an electromagnetic actuator module, is compact in space and low in energy consumption, does not need an additional hydraulic system, has extremely high cost economy and extremely high torque capacity expansibility, reduces the dragging torque of the clutch in a non-working state, and greatly improves the system efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive clutches, and more specifically, to an electromagnetic clutch. Background Art

[0002] The commonly used disconnection device for the motor shaft and the engine shaft in a hybrid vehicle is a multi-disc friction clutch, and it is basically a normally open design. For example, the Chinese utility model patent (publication number: CN220930004U) named a multi-disc clutch friction plate assembly. The clutch includes a driven disc. A plurality of arc-shaped grooves are evenly distributed on one side surface of the driven disc. An arc-shaped bottom plate is movably installed inside each arc-shaped groove. A friction plate main body is bonded to one side surface of each arc-shaped bottom plate. An installation mechanism for fixing the arc-shaped bottom plate is further provided on the surface of the driven disc.

[0003] In the above-mentioned existing multi-disc friction clutch structure, there is a problem that the drag torque in the non-working state is relatively large, resulting in a relatively low overall efficiency of the system. Summary of the Utility Model

[0004] The technical problem to be solved by the present utility model is the relatively low overall efficiency of the system. To overcome the defects of the above prior art, the present invention provides an electromagnetic coil-based actuator structure, which reduces the clutch drag torque, reduces the energy loss of the actuator, improves the overall efficiency of the system, and also brings excellent economy.

[0005] To achieve the purpose of the present utility model, the following technical solutions are adopted:

[0006] An electromagnetic clutch includes a coil assembly, an armature sleeve, an armature pressure plate, an output hub, an active claw disc, a spring and a passive claw disc which are coaxially arranged; the armature sleeve is installed on the inner peripheral wall of the coil assembly; the armature pressure plate is installed on the inner peripheral wall of the armature sleeve; the armature pressure plate is axially movably sleeved on the left part of the output hub, and the armature pressure plate and the output hub achieve circumferential transmission; the active claw disc is axially movably sleeved on the left part of the output hub, and the active claw disc and the output hub achieve circumferential transmission; the active claw disc is located on the right side of the armature pressure plate, and a spring seat is arranged on the outer peripheral wall on the right side of the output hub; the spring is sleeved on the output hub, the right end of the spring abuts against the spring seat, the left end of the spring abuts against the active claw disc, and under the action of the spring, the left end of the active claw disc abuts against the right end of the armature pressure plate; the passive claw disc is installed on the right side of the output hub, and the coil assembly is energized to provide electromagnetic force to drive the armature pressure plate to abut against the active claw disc to the right, and finally the active claw disc moves to the right to achieve transmission with the passive claw disc. This electromagnetic clutch can integrate module design, electromagnetic actuator module in an extremely compact space, with compact space, low energy consumption, no need for an additional hydraulic system, having extremely high cost economy and strong torque capacity expandability, and realizing a normally open design under the action of the spring, reducing the drag torque of the clutch in the non-working state, and at the same time, the mode switching can be completed with a small execution force, greatly improving the system efficiency.

[0007] Preferably, a plurality of pressure plate insertion convex blocks are arranged at intervals along the circumferential direction on the right end face of the armature pressure plate, and each pressure plate insertion convex block protrudes axially; a plurality of hub insertion convex blocks are arranged at intervals along the circumferential direction on the outer peripheral wall of the left end of the output hub, and each hub insertion convex block protrudes radially, and a first insertion gap for inserting and matching with the pressure plate insertion convex block is formed between two adjacent hub insertion convex blocks. Through the structures of the pressure plate insertion convex blocks and the hub insertion convex blocks, the functions of axial guiding and circumferential limiting can be achieved, ensuring that the armature pressure plate can achieve movable connection and facilitating the transmission of torque to the output hub.

[0008] Preferably, a hub cylinder is integrally formed at the left end of the output hub, and the hub cylinder is coaxially arranged with the output hub; the armature pressure plate is sleeved on the hub cylinder, and the pressure plate insertion convex blocks are inserted into the corresponding first insertion gaps, and a clamping groove is arranged along the circumferential direction on the outer peripheral wall on the left side of the hub cylinder; an annular snap ring is arranged on the clamping groove, and the armature pressure plate is axially limited between the annular snap ring and the hub insertion convex blocks. Through the hub cylinder and the annular snap ring, the output hub and the armature pressure plate can be integrated, further ensuring the coaxiality of the two, and making the overall fit and integration degree higher, and at the same time, it is more conducive to adapting to different designs of customers and integrating with customers.

[0009] Preferably, a plurality of claw plate plug-in protrusions are arranged at intervals along the circumferential direction on the inner circumferential wall of the active claw plate, and each claw plate plug-in protrusion protrudes radially, and the claw plate plug-in protrusions are axially aligned and abutted with the pressure plate plug-in protrusions; a second plug-in gap is formed between two adjacent claw plate plug-in protrusions to be plugged and matched with the hub plug-in protrusions. The active claw plate can be axially moved by the abutment between the claw plate plug-in protrusions and the pressure plate plug-in protrusions, thereby facilitating the separation of the active claw plate and the passive claw plate.

[0010] Preferably, a convex disc is provided on the outer peripheral wall of the right end of the output hub along the circumferential direction; an abutment plane is provided on the right end surface of the active claw disc along the circumferential direction; the spring is sleeved on the hub plug-in convex block, and the left end of the spring abuts on the abutment plane; the right end of the spring abuts on the left end surface of the convex disc. The convex disc and the annular abutment plane facilitate better positioning of the spring.

[0011] Preferably, the left end face of the passive claw disc is provided with a first meshing tooth surface along the circumferential direction; the right end face of the active claw disc is provided with a second meshing tooth surface along the circumferential direction; in the meshing state, the first meshing tooth surface is meshed and connected with the second meshing tooth surface. The first meshing tooth surface and the second meshing tooth surface facilitate the transmission of torque to the passive claw disc.

[0012] Preferably, the coil assembly includes a coil support and a coil; the coil support includes an annular coil sleeve and an annular coil cover; a coil installation groove is circumferentially arranged on the side wall of the annular coil sleeve; the coil is circumferentially installed in the coil installation groove, the annular coil cover is installed on the annular coil sleeve, and the coil is limited between the annular coil sleeve and the annular coil cover. The coil installation groove facilitates the installation of the coil, and the annular coil cover facilitates the protection of the coil.

[0013] Preferably, a first annular step is provided on the inner circumferential wall of the annular coil cover along the circumferential direction; a second annular step is provided on the outer circumferential wall of the armature pressure plate along the circumferential direction; the armature sleeve is axially limited on the second annular step, and the coil assembly is energized to provide electromagnetic force to drive the armature sleeve to move rightward and be limited on the first annular step. The armature sleeve and the armature pressure plate are limited by the second annular step, and the armature sleeve is limited by the first annular step after being energized and moved, thereby preventing the armature sleeve from being separated from the coil support.

[0014] Preferably, an inner spline groove connected to the gearbox shaft is provided on the inner wall of the output hub.

[0015] In summary, the advantages of the present utility model are that the electromagnetic clutch can integrate a modular design within an extremely compact space. The electromagnetic actuator module is compact, has low energy consumption, does not require an additional hydraulic system, has extremely high cost economy and strong torque capacity expandability, and realizes a normally open design under the action of a spring, reducing the drag torque of the clutch in the non-working state. At the same time, the mode switching can be completed with a small execution force, greatly improving the system efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. 6 is a schematic structural diagram of the electromagnetic clutch according to Embodiment 1 of the present utility model.

[0017] Figure 2 FIG. 7 is a cross-sectional view of the electromagnetic clutch according to Embodiment 1 of the present utility model.

[0018] Figure 3 FIG. 8 is an exploded view of the electromagnetic clutch according to Embodiment 1 of the present utility model.

[0019] Figure 4 FIG. 9 is a schematic diagram of torque transmission of the electromagnetic clutch of the present utility model.

[0020] Figure 5 FIG. 10 is a schematic structural diagram of the electromagnetic clutch according to Embodiment 2 of the present utility model.

[0021] Figure 6 FIG. 11 is an exploded view of the electromagnetic clutch according to Embodiment 2 of the present utility model.

[0022] DESCRIPTION OF THE REFERENCE NUMERALS:

[0023] 2. Coil bracket; 21. Annular coil sleeve; 22. Annular coil cover; 221. First annular step; 23. Coil installation groove; 3. Coil; 4. Armature sleeve; 5. Armature pressure plate; 51. Pressure plate insertion convex block; 52. Second annular step; 6. Output hub; 60. First insertion neutral gear; 61. Hub insertion convex block; 62. Convex disc; 63. Internal spline groove; 64. Hub cylinder; 641. Card slot; 65. Annular snap ring; 7. Driving claw disc; 70. Second insertion neutral gear; 71. Claw disc insertion convex block; 72. Contact plane; 73. Second meshing tooth surface; 8. Spring; 9. Driven claw disc; 91. First meshing tooth surface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] First of all, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of the present application and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0025] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected to" 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 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 embodiments of the present application can be understood according to specific circumstances.

[0026] In the embodiments of the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely means that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely means that the first feature is at a lower horizontal level than the second feature.

[0027] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Embodiment 1

[0029] As Figures 1 to 4As shown in the figure, an electromagnetic clutch includes an annular coil assembly coaxially arranged on a transmission shaft, an annular armature sleeve 4, an annular armature pressure plate 5, an annular output hub 6, an annular driving claw disc 7, a spring 8, and an annular driven claw disc 9. The armature sleeve 4 is installed on the inner peripheral wall of the coil assembly. The armature pressure plate 5 is installed on the inner peripheral wall of the armature sleeve 4. The armature pressure plate 5 is axially movably sleeved on the left part of the output hub 6, and the armature pressure plate 5 and the output hub 6 achieve circumferential transmission. The armature pressure plate 5 and the output hub 6 achieve axial movement and circumferential transmission through an inserted and sleeved manner. The driving claw disc 7 is axially movably sleeved on the left part of the output hub 6, and the driving claw disc 7 and the output hub 6 achieve circumferential transmission. The driving claw disc 7 is located on the right side of the armature pressure plate 5, and a spring seat is arranged on the outer peripheral wall on the right side of the output hub 6. The spring 8 is sleeved on the output hub 6, the right end of the spring 8 abuts against the spring seat, the left end of the spring 8 abuts against the driving claw disc 7, and under the action of the spring 8, the left end of the driving claw disc 7 abuts against the right end of the armature pressure plate 5. The driven claw disc 9 is located on the right side of the output hub 6, and the coil assembly is energized to provide an electromagnetic force to drive the armature pressure plate 5 to abut against the driving claw disc 7 to the right, and finally the driving claw disc 7 moves to the right to achieve clamping connection with the driven claw disc 9. This electromagnetic clutch can integrate module design, electromagnetic actuator module in an extremely compact space, with a compact space, low energy consumption, no need for an additional hydraulic system, extremely high cost economy, strong expandability of torque capacity, and a normally open design is achieved under the action of the spring 8 to reduce the drag torque of the clutch in the non-working state. At the same time, the mode switching can be completed with a small execution force, greatly improving the system efficiency.

[0030] As Figures 1 to 3As shown in the figure, a plurality of press plate insertion bumps 51 are arranged at equal intervals along the circumferential direction on the right end face of the armature press plate 5, and each press plate insertion bump 51 protrudes axially; a plurality of hub insertion bumps 61 are arranged at equal intervals along the circumferential direction on the outer peripheral wall of the left end of the output hub 6, and each hub insertion bump 61 protrudes radially. A first insertion gap 60 for inserting and mating with the press plate insertion bump 51 is formed between two adjacent hub insertion bumps 61. An internal spline groove 63 connected to the transmission shaft is provided on the inner wall of the output hub 6. Through the structures of the press plate insertion bump 51 and the hub insertion bump 61, the functions of axial guiding and circumferential limiting can be achieved, ensuring that the armature press plate 5 can be movably connected, facilitating the transmission of torque to the output hub 6. A plurality of claw plate insertion bumps 71 are arranged at intervals along the circumferential direction on the inner peripheral wall of the driving claw plate 7, and each claw plate insertion bump 71 protrudes radially. The claw plate insertion bump 71 is axially aligned with and abuts against the press plate insertion bump 51; a second insertion gap 70 for inserting and mating with the hub insertion bump 61 is formed between two adjacent claw plate insertion bumps 71. The driving claw plate 7 can be axially moved by the abutment of the claw plate insertion bump 71 and the press plate insertion bump 51, facilitating the separation of the driving claw plate 7 and the driven claw plate 9.

[0031] As Figures 1 to 3 shown, by designing the output hub 6 as an independent small workpiece, it is convenient to cooperate with the transmission shafts of different customers. As a modular design, only this independent small workpiece needs to be changed, and accordingly, other components of the clutch module do not need to be changed, facilitating rapid development and reducing development costs. By forming a large spline with the hub insertion bump 61, it can serve as the axial guiding function for the press plate insertion bump 51 feature on the armature press plate 5, can serve as the axial guiding function for the claw plate insertion bump 71 on the driving claw plate 7, and can be movably connected to the claw plate insertion bump 71 of the driving claw plate 7 to transmit torque from the driving claw plate 7 to the part output hub 6, and further output and transmit it to the transmission shaft.

[0032] As Figures 1 to 3 shown, the spring seat is a convex disk 62 provided on the outer peripheral wall of the right end of the output hub 6; a circular abutting plane 72 is arranged along the circumferential direction on the right end face of the driving claw plate 7 and outside the claw plate insertion bump 71; the spring 8 is sleeved on the hub insertion bump 61, and the left end of the spring 8 abuts against the abutting plane 72; the right end of the spring 8 abuts against the left end face of the convex disk 62. The convex disk 62 and the abutting plane 72 facilitate better positioning and limiting of the spring 8.

[0033] As Figures 1 to 3As shown in the figure, the left end face of the passive claw disc 9 is provided with a first meshing tooth surface 91 along the circumferential direction; the right end face of the active claw disc 7 is provided with a second meshing tooth surface 73 along the circumferential direction; in the meshing state, the first meshing tooth surface 91 is meshed and connected with the second meshing tooth surface 73. Through the first meshing tooth surface 91 and the second meshing tooth surface 73, it is convenient to transfer the torque to the passive claw disc 9.

[0034] As Figures 1 to 3 shown in the figure, the coil assembly includes a coil bracket 2 and a coil 3; the coil bracket 2 includes an annular coil sleeve 21 and an annular coil cover 22; a coil mounting groove 23 is provided on the side wall of the annular coil sleeve 21 along the circumferential direction; the coil 3 is mounted in the coil mounting groove 23 along the circumferential direction, and the annular coil cover 22 is mounted on the annular coil sleeve 21 and limits the coil 3 between the annular coil sleeve 21 and the annular coil cover 22. Through the coil mounting groove 23, it is convenient to install the coil 3, and at the same time, through the annular coil cover 22, it is convenient to protect the coil 3. A first annular step 221 is provided on the inner peripheral wall of the annular coil cover 22 along the circumferential direction; a second annular step 52 is provided on the outer peripheral wall of the armature pressure plate 5 along the circumferential direction; the armature sleeve 4 is axially limited on the second annular step 52 and is driven by the electromagnetic force provided by the energization of the coil assembly to move the armature sleeve 4 to the right and be limited on the first annular step 221. Through the second annular step 52, the armature sleeve 4 is limited with the armature pressure plate 5, and through the first annular step 221, it is convenient to limit the armature sleeve 4 after energized movement, thereby preventing the armature sleeve 4 from detaching from the annular coil cover 22 and also facilitating the armature pressure plate 5 to abut against the active claw disc 7.

[0035] As Figures 1 to 4 shown in the figure, in the initial state, the right side of the spring 8 is fixed on the output hub 6, the left side of the spring 8 presses on the active claw disc 7, and the initial position of the active claw disc 7 is at the left dead point. At this time, the active claw disc 7 and the passive claw disc 9 are in a separated state, that is, the clutch is in an off state. In the energized state, the coil assembly provides an electromagnetic force, and the electromagnetic force causes the armature sleeve 4 and the armature pressure plate 5 to move to the right. Through the rightward movement of the armature pressure plate 5, the active claw disc 7 is pushed to move to the right, so that the active claw disc 7 moves to the right and meshes with the passive claw disc 9, that is, the clutch is in a meshing state, and at this time, torque transmission can be achieved.

[0036] Embodiment 2

[0037] The structure of this embodiment is only different from that of Embodiment 1 in the output hub 6, and other structures and torque transmission methods are the same.

[0038] As Figure 1 、 Figure 5 and Figure 6As shown, a hub cylinder 64 is integrally formed at the left end of the output hub 6 in this embodiment, and the hub cylinder 64 is coaxially arranged with the output hub 6. The armature pressure plate 5 is sleeved on the hub cylinder 64, and each pressure plate insertion lug 51 is inserted into each corresponding first insertion notch 60. A clamping groove 641 is circumferentially arranged on the outer peripheral wall of the left side of the hub cylinder 64; an annular snap ring 65 is arranged on the clamping groove 641, and the armature pressure plate 5 is axially limited between the annular snap ring 65 and the hub insertion lug 61. At the same time, under the action of the spring 8, the left end of the armature pressure plate 5 can also abut against the annular snap ring 65, and the right end of the armature pressure plate 5 abuts against the driving claw disc 7, ensuring that when the armature pressure plate 5 is energized and moves to the right, it can drive the driving claw disc 7 to move synchronously.

[0039] By directly sleeving the armature pressure plate 5 on the hub cylinder 64, the coaxiality and the degree of combination between the two are further ensured, and the fit and integration degree of the overall parts are higher. At the same time, it is more conducive to adapting to different designs of customers and integrating with customers.

[0040] In summary, the advantages of the present utility model are that the electromagnetic clutch can integrate a module design and an electromagnetic actuator module in an extremely compact space. It has a compact space, low energy consumption, does not require an additional hydraulic system, has extremely high cost economy and strong expandability of torque capacity. In an installation space similar to that of a single clutch, it has a torque capacity of up to 2000 Nm, covering the torque ranges of most passenger car engines. And it realizes a normally open design under the action of the spring 8, reducing the drag torque of the clutch in the non-working state. At the same time, the mode switching can be completed with a small execution force, greatly improving the system efficiency. Although the structure of this application is developed based on a hybrid platform, it can also be extended to applications in other power disconnection fields such as multi-speed pure electric gearboxes.

[0041] In the description of the embodiments of the present application, it should be noted that in the description of the present application, the terms indicating the direction or positional relationship such as "inner" and "outer" are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present application.

[0042] In the description of the present application, the descriptions referring to terms such as "one embodiment", "some embodiments", "in this embodiment", "specific examples", or "some examples", etc., mean that the specific features, mechanisms, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0043] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An electromagnetic clutch, characterized in that, It includes a coil assembly, an armature sleeve (4), an armature pressure plate (5), an output hub (6), a driving claw disc (7), a spring (8) and a driven claw disc (9) which are coaxially arranged; the armature sleeve (4) is installed on the inner peripheral wall of the coil assembly; the armature pressure plate (5) is installed on the inner peripheral wall of the armature sleeve (4); the armature pressure plate (5) is axially movably sleeved on the left part of the output hub (6), and the armature pressure plate (5) and the output hub (6) achieve circumferential transmission; the driving claw disc (7) is axially movably sleeved on the left part of the output hub (6), and the driving claw disc (7) and the output hub (6) achieve circumferential transmission; the driving claw disc (7) is located on the right side of the armature pressure plate (5), and a spring seat is arranged on the right outer peripheral wall of the output hub (6); the spring (8) is sleeved on the output hub (6), the right end of the spring (8) abuts against the spring seat, the left end of the spring (8) abuts against the driving claw disc (7), and under the action of the spring (8), the left end of the driving claw disc (7) abuts against the right end of the armature pressure plate (5); the driven claw disc (9) is installed on the right side of the output hub (6), and the armature pressure plate (5) is driven by energizing the coil assembly to provide electromagnetic force to abut against the driving claw disc (7) to the right, and finally the driving claw disc (7) moves to the right to achieve transmission with the driven claw disc (9).

2. The electromagnetic clutch according to claim 1, characterized in that, A plurality of pressure plate insertion bumps (51) are arranged at intervals along the circumferential direction on the right end face of the armature pressure plate (5), and each pressure plate insertion bump (51) protrudes axially; a plurality of hub insertion bumps (61) are arranged at intervals along the circumferential direction on the left outer peripheral wall of the output hub (6), and each hub insertion bump (61) protrudes radially, and a first insertion gap (60) for inserting and mating with the pressure plate insertion bump (51) is formed between two adjacent hub insertion bumps (61).

3. The electromagnetic clutch according to claim 2, characterized in that, A hub cylinder (64) is integrally formed at the left end of the output hub (6), and the hub cylinder (64) and the output hub (6) are coaxially arranged; the armature pressure plate (5) is sleeved on the hub cylinder (64), and the pressure plate insertion bump (51) is inserted into the corresponding first insertion gap (60), and a clamping groove (641) is arranged along the circumferential direction on the outer peripheral wall on the left side of the hub cylinder (64); a retaining ring (65) is arranged on the clamping groove (641), and the armature pressure plate (5) is axially limited between the retaining ring (65) and the hub insertion bump (61).

4. The electromagnetic clutch according to claim 2, characterized in that, A plurality of claw disc insertion bumps (71) are arranged at intervals along the circumferential direction on the inner peripheral wall of the driving claw disc (7), and each claw disc insertion bump (71) protrudes radially, the claw disc insertion bump (71) and the pressure plate insertion bump (51) are axially aligned and abutted; a second insertion gap (70) for inserting and mating with the hub insertion bump (61) is formed between two adjacent claw disc insertion bumps (71).

5. The electromagnetic clutch according to claim 1, characterized in that, The spring seat is a convex disk (62) provided on the outer peripheral wall of the right end of the output hub (6); a contact plane (72) is circumferentially provided on the right end face of the active jaw plate (7); the spring (8) is sleeved on the hub insertion projection (61), and the left end of the spring (8) abuts against the contact plane (72); the right end of the spring (8) abuts against the left end face of the convex disk (62).

6. The electromagnetic clutch according to claim 1, characterized in that, A first meshing tooth surface (91) is circumferentially provided on the left end face of the passive jaw plate (9); a second meshing tooth surface (73) is circumferentially provided on the right end face of the active jaw plate (7); in the meshing state, the first meshing tooth surface (91) is meshed and connected with the second meshing tooth surface (73).

7. The electromagnetic clutch according to claim 1, characterized in that, The coil assembly includes a coil bracket (2) and a coil (3); the coil bracket (2) includes an annular coil sleeve (21) and an annular coil cover (22); a coil installation groove (23) is circumferentially provided on the side wall of the annular coil sleeve (21); the coil (3) is circumferentially installed in the coil installation groove (23), and the annular coil cover (22) is installed on the annular coil sleeve (21) and limits the coil (3) between the annular coil sleeve (21) and the annular coil cover (22).

8. The electromagnetic clutch according to claim 7, wherein A first annular step (221) is circumferentially provided on the inner peripheral wall of the annular coil cover (22); a second annular step (52) is circumferentially provided on the outer peripheral wall of the armature pressure plate (5); the armature sleeve (4) is axially limited on the second annular step (52), and the armature sleeve (4) is driven to move rightward and limited on the first annular step (221) by the electromagnetic force provided by the energization of the coil assembly.

9. The electromagnetic clutch according to claim 7, wherein, An internal spline groove (63) connected to the transmission shaft is provided on the inner wall of the output hub (6).

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