Electromagnetic clutch structure

Abstract

The invention provides an electromagnetic clutch structure, which relates to the technical field of automobile clutches, and comprises a stator bracket, 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 coil assembly is installed on the stator support, and the armature sleeve is installed on the coil assembly. The armature pressure plate is mounted on the armature sleeve; the output hub is sleeved with the armature pressing disc and the driving claw disc in an axial moving mode, the armature pressing disc and the driving claw disc are 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 module design and an electromagnetic actuator module are integrated, the space is compact, the energy consumption is low, an additional hydraulic system is not needed, the cost economy is extremely high, the torque capacity expansibility is extremely high, the dragging torque of the clutch in a non-working state is reduced, and the system efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile clutches, and in particular to an electromagnetic clutch structure. Background Art

[0002] The commonly used disconnecting device between the motor shaft and the engine shaft in hybrid vehicles is a multi-plate friction clutch, which is basically a normally open design. For example, the Chinese invention patent (publication number CN220930004U) is named a multi-plate clutch friction plate assembly, which includes a driven plate, and a plurality of arc-shaped grooves are evenly distributed on one side surface of the driven plate, and an arc-shaped bottom plate is movably installed inside each of the arc-shaped grooves, and a friction plate body is bonded to one side surface of each of the arc-shaped bottom plates. The surface of the driven plate is also provided with a mounting mechanism for fixing the arc-shaped bottom plate.

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

[0004] The technical problem to be solved by the present invention is that the overall efficiency of the system is low. In order to overcome the defects of the above-mentioned prior art, the present invention provides an actuator structure integrated with an electromagnetic coil, 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] For the purpose of the present invention, the following technical solutions are adopted to achieve the goal:

[0006] An electromagnetic clutch structure, comprising a coaxially arranged stator support, a coil assembly, an armature sleeve, an armature pressure plate, an output wheel hub, an active claw plate, a spring and a passive claw plate; a coil positioning groove is arranged in the middle of the stator support; the coil support is mounted on the coil positioning groove; the armature sleeve is mounted on the inner circumferential wall of the coil assembly; the armature pressure plate is mounted on the inner circumferential wall of the armature sleeve; the armature pressure plate is axially movable sleeved on the left part of the output wheel hub, and the armature pressure plate and the output wheel hub realize circumferential transmission; the active claw plate is axially movable sleeved on the left part of the output wheel hub The active claw disc and the output wheel hub realize circumferential transmission; the active claw disc is located on the right side of the armature pressure disc, and a spring seat is arranged on the right peripheral wall of the output wheel hub; the spring sleeve is arranged on the output wheel hub, and the right end of the spring abuts on the spring seat, and the left end of the spring abuts on 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 disc; the passive claw disc is installed on the right side of the output wheel hub, and the electromagnetic force provided by the coil assembly drives the armature pressure disc to the right against the active claw disc, and finally the active claw disc moves to the right to realize transmission with the passive claw disc. The electromagnetic clutch structure can integrate the module design and the electromagnetic actuator module in an extremely compact space, with compact space, low energy consumption, no need for additional hydraulic system, extremely high cost-effectiveness and strong torque capacity expandability, and realizes the normally open design under the action of the spring, reduces the drag torque of the clutch in the non-working state, and can complete the mode switching with a small execution force, which greatly improves the system efficiency.

[0007] Preferably, the right end surface of the armature pressure plate is provided with a plurality of pressure plate plug-in protrusions arranged at intervals along the circumference, and each pressure plate plug-in protrusion is axially protruding; the left end outer peripheral wall of the output hub is provided with a plurality of wheel hub plug-in protrusions arranged at intervals along the circumference, and each wheel hub plug-in protrusion is radially protruding, and a first plug-in gap that is plugged and matched with the pressure plate plug-in protrusion is formed between two adjacent wheel hub plug-in protrusions. The structure of the pressure plate plug-in protrusion and the wheel hub plug-in protrusion can play the role of axial guidance and circumferential limitation, ensuring that the armature pressure plate can be flexibly connected, so as to facilitate the transmission of torque to the output hub.

[0008] Preferably, the left end of the output hub is integrally formed with a hub cylinder, 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 plug-in protrusion is inserted into the corresponding first plug-in neutral position, and a clamping groove is circumferentially arranged on the outer peripheral wall of the left side of the hub cylinder; an annular retaining spring is arranged on the clamping groove, and the armature pressure plate is axially limited between the annular retaining spring and the hub plug-in protrusion. The output hub and the armature pressure plate can be integrated through the hub cylinder and the annular retaining spring, further ensuring the coaxiality of the two, and making the overall matching degree and integration higher, and at the same time more conducive to adapting to different designs of customers and facilitating integration 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] To sum up, the advantage of the present invention is that the electromagnetic clutch structure can integrate modular design and electromagnetic actuator module in an extremely compact space. It has compact space, low energy consumption, does not require an additional hydraulic system, has extremely high cost-effectiveness and strong torque capacity scalability, and realizes a normally open design under the action of a spring, reducing the drag torque of the clutch in a non-working state. At the same time, mode switching can be completed with a smaller execution force, greatly improving system efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the electromagnetic clutch structure of embodiment 1 of the present invention.

[0017] Figure 2 It is a cross-sectional view of the electromagnetic clutch structure of embodiment 1 of the present invention.

[0018] Figure 3 It is an exploded view of the electromagnetic clutch structure of embodiment 1 of the present invention.

[0019] Figure 4 It is a torque transmission schematic diagram of the electromagnetic clutch structure of the present invention.

[0020] Figure 5 It is a structural schematic diagram of the electromagnetic clutch structure of embodiment 2 of the present invention.

[0021] Figure 6 It is an exploded view of the electromagnetic clutch structure of embodiment 2 of the present invention.

[0022] Description of reference numerals:

[0023] 1. Sub-bracket; 11. Coil positioning groove; 2. Coil bracket; 21. Annular coil sleeve; 22. Annular coil cover; 221. First annular step; 23. Coil mounting groove; 3. Coil; 4. Armature sleeve; 5. Armature pressure plate; 51. Pressure plate plug-in protrusion; 52. Second annular step; 6. Output hub; 60. First plug-in neutral position; 61. Hub plug-in protrusion; 62. Convex plate; 63. Internal spline groove; 64. Hub cylinder; 641. Retaining groove; 65. Annular retaining spring; 7. Active claw plate; 70. Second plug-in neutral position; 71. Claw plate plug-in protrusion; 72. Abutment plane; 73. Second meshing tooth surface; 8. Spring; 9. Passive claw plate; 91. First meshing tooth surface. DETAILED DESCRIPTION

[0024] First, those skilled in the art should understand that these implementations 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 to them as needed 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 limited, the terms "connected" and "connection" 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 ordinary technicians in this field, 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 limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

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

[0028] Example 1

[0029] like Figures 1 to 4As shown, an electromagnetic clutch structure includes a stator support 1, an annular coil assembly, an annular armature sleeve 4, an annular armature pressure plate 5, an annular output wheel hub 6, an annular active claw plate 7, a spring 8 and an annular passive claw plate 9 coaxially arranged on the gearbox shaft; the coil assembly is installed on the stator support 1; a coil positioning groove 11 is arranged in the middle of the side wall of the stator support 1; the coil support 2 is rotatably connected to the coil positioning groove 11, and the coil support 2 is conveniently limited by the coil positioning groove 11. 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 movable and sleeved on the left part of the output wheel hub 6, and the armature pressure plate 5 and the output wheel hub 6 realize circumferential transmission; the armature pressure plate 5 and the output wheel hub 6 realize axial movement and circumferential transmission by plug-in sleeve. The active claw plate 7 is axially movable and sleeved on the left part of the output hub 6, and the active claw plate 7 and the output hub 6 realize circumferential transmission; the active claw plate 7 is located on the right side of the armature pressure plate 5, and a spring seat is provided on the right peripheral wall of the output hub 6; the spring 8 is sleeved on the output hub 6, and the right end of the spring 8 abuts on the spring seat, and the left end of the spring 8 abuts on the active claw plate 7, and under the action of the spring 8, the left end of the active claw plate 7 is abutted against the right end of the armature pressure plate 5; the passive claw plate 9 is located on the right side of the output hub 6, and the electromagnetic force provided by the coil assembly drives the armature pressure plate 5 to abut against the active claw plate 7 to the right, and finally the active claw plate 7 moves to the right to realize the clamping connection with the passive claw plate 9. The electromagnetic clutch structure can integrate a modular design and an electromagnetic actuator module in an extremely compact space. It has a compact space, low energy consumption, and does not require an additional hydraulic system. It has extremely high cost-effectiveness and strong scalability in torque capacity. Under the action of spring 8, a normally open design is achieved to reduce the drag torque of the clutch in a non-working state. At the same time, mode switching can be completed with a smaller execution force, greatly improving system efficiency.

[0030] like Figures 1 to 3As shown, the right end surface of the armature pressure plate 5 is provided with a plurality of pressure plate plug-in protrusions 51 arranged at equal intervals along the circumferential direction, and each pressure plate plug-in protrusion 51 is axially protruding; the left end outer peripheral wall of the output wheel hub 6 is provided with a plurality of wheel hub plug-in protrusions 61 arranged at equal intervals along the circumferential direction, and each wheel hub plug-in protrusion 61 is radially protruding, and a first plug-in neutral position 60 that is plugged and matched with the pressure plate plug-in protrusion 51 is formed between two adjacent wheel hub plug-in protrusions 61. An inner spline groove 63 connected to the gearbox shaft is provided on the inner wall of the output wheel hub 6. The structure of the pressure plate plug-in protrusion 51 and the wheel hub plug-in protrusion 61 can play the role of axial guidance and circumferential limit, ensuring that the armature pressure plate 5 can be flexibly connected, so as to facilitate the transmission of torque to the output wheel hub 6. A plurality of claw plate plug-in protrusions 71 are arranged at intervals along the circumferential direction on the inner peripheral wall of the active claw plate 7, and each claw plate plug-in protrusion 71 protrudes radially, and the claw plate plug-in protrusion 71 is axially aligned and abutted with the pressure plate plug-in protrusion 51; a second plug-in gap 70 is formed between two adjacent claw plate plug-in protrusions 71 to be plugged and matched with the hub plug-in protrusion 61. The active claw plate 7 can be moved axially by the claw plate plug-in protrusion 71 abutting against the pressure plate plug-in protrusion 51, so as to facilitate the separation of the active claw plate 7 and the passive claw plate 9.

[0031] like Figures 1 to 3 As shown, by independently designing a small workpiece for the output hub 6, it is convenient to match with the gearbox shaft of different customers. As a modular design, only the independent small workpiece needs to be changed, so other parts of the clutch module do not need to be changed accordingly, which is convenient for rapid development and reduces development costs. The large spline formed by the hub plug-in protrusion 61 can serve as the axial guide of the pressure plate plug-in protrusion 51 on the armature pressure plate 5, can serve as the axial guide of the claw plate plug-in protrusion 71 on the active claw plate 7, and can be flexibly connected with the claw plate plug-in protrusion 71 of the active claw plate 7, so as to transfer the torque from the active claw plate 7 to the part output hub 6, and further output and transfer it to the gearbox shaft.

[0032] like Figures 1 to 3 As shown, the spring seat is a convex disc 62 arranged on the outer peripheral wall of the right end of the output hub 6; an annular abutting plane 72 is arranged on the right end surface of the active claw disc 7 and located on the outer circle of the claw disc plug-in protrusion 71 along the circumferential direction; the spring 8 is sleeved on the hub plug-in protrusion 61, and the left end of the spring 8 abuts on the abutting plane 72; the right end of the spring 8 abuts on the left end surface of the convex disc 62. The convex disc 62 and the abutting plane 72 facilitate better positioning and limiting of the spring 8.

[0033] like Figures 1 to 3As shown, the left end face of the passive claw plate 9 is provided with a first meshing tooth surface 91 along the circumferential direction; the right end face of the active claw plate 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. The first meshing tooth surface 91 and the second meshing tooth surface 73 facilitate the transmission of torque to the passive claw plate 9.

[0034] like Figures 1 to 3 As shown, the coil assembly includes a coil support 2 and a coil 3; the coil support 2 includes an annular coil sleeve 21 and an annular coil cover 22; a coil mounting groove 23 is circumferentially arranged on the side wall of the annular coil sleeve 21; the coil 3 is circumferentially installed in the coil mounting groove 23, and the annular coil cover 22 is installed on the annular coil sleeve 21, and the coil 3 is limited between the annular coil sleeve 21 and the annular coil cover 22. The coil mounting groove 23 facilitates the installation of the coil 3, and the annular coil cover 22 facilitates the protection of the coil 3. A first annular step 221 is circumferentially arranged on the inner circumferential wall of the annular coil cover 22; a second annular step 52 is circumferentially arranged on the outer circumferential 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 providing electromagnetic force through the power supply of the coil assembly. The armature sleeve 4 and the armature pressure plate 5 are limited by the second annular step 52, and the armature sleeve 4 is limited by the first annular step 221 after being powered on and moved, thereby preventing the armature sleeve 4 from separating from the annular coil cover 22 and making it easier for the armature pressure plate 5 to press against the active claw plate 7.

[0035] like Figures 1 to 4 As shown, in the initial state, the right side of the spring 8 is fixed on the output wheel hub 6, and the left side of the spring 8 is pressed on the active claw plate 7. The initial position of the active claw plate 7 is at the left dead center. At this time, the active claw plate 7 and the passive claw plate 9 are in a separated state, that is, the clutch is in a disconnected state. In the energized state, the coil assembly provides electromagnetic force, which causes the armature sleeve 4 and the armature pressure plate 5 to move to the right. The armature pressure plate 5 moves to the right, pushing the active claw plate 7 to move to the right, causing the active claw plate 7 to move to the right and engage with the passive claw plate 9, that is, the clutch is in an engaged state, and torque transmission can be achieved at this time.

[0036] Example 2

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

[0038] like Figure 1 , Figure 5 and Figure 6As shown, the left end of the output hub 6 in this embodiment is integrally formed with a hub cylinder 64, 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 plug-in protrusion 51 is inserted into each corresponding first plug-in neutral position 60, and a clamping groove 641 is circumferentially arranged on the outer peripheral wall of the left side of the hub cylinder 64; an annular retaining spring 65 is arranged on the retaining groove 641, and the armature pressure plate 5 is axially limited between the annular retaining spring 65 and the hub plug-in protrusion 61, and at the same time, under the action of the spring 8, the left end of the armature pressure plate 5 can also be pressed against the annular retaining spring 65, and the right end of the armature pressure plate 5 can be pressed against the active claw plate 7, ensuring that when the armature pressure plate 5 is energized and moves to the right, it can drive the active claw plate 7 to move synchronously.

[0039] By directly sleeve the armature pressure plate 5 on the wheel hub cylinder 64, the coaxiality and bonding between the two are further guaranteed, and the matching degree and integration degree of the overall parts are made higher, which is more conducive to adapting to different designs of customers and facilitating integration with customers.

[0040] In summary, the advantage of the present invention is that the electromagnetic clutch structure can integrate the modular design and electromagnetic actuator module in an extremely compact space. The space is compact, the energy consumption is low, and no additional hydraulic system is required. It has extremely high cost-effectiveness and strong scalability of torque capacity. In an installation space similar to that of a single clutch, it has a torque capacity of up to 2000Nm, covering the torque range of most passenger car engines. And under the action of the spring 8, a normally open design is realized 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 smaller execution force, which greatly improves the system efficiency. Although the structure of the present application is developed based on a hybrid platform, it can also be expanded to applications in other power disconnection fields such as multi-speed pure electric transmissions.

[0041] In the description of the embodiments of the present application, it should be noted that in the description of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships 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 on the present application.

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

[0043] The above is only a specific implementation 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 a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An electromagnetic clutch structure, characterized in that: The invention comprises a coaxially arranged stator support (1), a coil assembly, an armature sleeve (4), an armature pressure plate (5), an output wheel hub (6), an active claw plate (7), a spring (8) and a passive claw plate (9); a coil positioning groove (11) is arranged in the middle of the stator support (1); the coil support (2) is mounted on the coil positioning groove (11); the armature sleeve (4) is mounted on the inner peripheral wall of the coil assembly; the armature pressure plate (5) is mounted on the inner peripheral wall of the armature sleeve (4); the armature pressure plate (5) is axially movable and sleeved on the left part of the output wheel hub (6), and the armature pressure plate (5) and the output wheel hub (6) realize circumferential transmission; the active claw plate (7) is axially movable and sleeved on the left part of the output wheel hub (6), and The active claw disc (7) and the output wheel hub (6) realize circumferential transmission; the active claw disc (7) is located on the right side of the armature pressure disc (5), and a spring seat is arranged on the right peripheral wall of the output wheel hub (6); the spring (8) is sleeved on the output wheel hub (6), and the right end of the spring (8) abuts against the spring seat, and the left end of the spring (8) abuts against the active claw disc (7), and under the action of the spring (8), the left end of the active claw disc (7) abuts against the right end of the armature pressure disc (5); the passive claw disc (9) is installed on the right side of the output wheel hub (6), and the coil assembly is energized to provide electromagnetic force to drive the armature pressure disc (5) to abut against the active claw disc (7) to the right, and finally the active claw disc (7) moves to the right to realize transmission with the passive claw disc (9).

2. The electromagnetic clutch structure according to claim 1, characterized in that: The right end surface of the armature pressure plate (5) is provided with a plurality of pressure plate plug-in protrusions (51) arranged at intervals along the circumferential direction, and each pressure plate plug-in protrusion (51) protrudes axially; the left end outer peripheral wall of the output wheel hub (6) is provided with a plurality of wheel hub plug-in protrusions (61) arranged at intervals along the circumferential direction, and each wheel hub plug-in protrusion (61) protrudes radially, and a first plug-in neutral position (60) pluggably matched with the pressure plate plug-in protrusion (51) is formed between two adjacent wheel hub plug-in protrusions (61).

3. The electromagnetic clutch structure according to claim 2, characterized in that: The left end of the output wheel hub (6) is integrally formed with a wheel hub cylinder (64), and the wheel hub cylinder (64) and the output wheel hub (6) are coaxially arranged; the armature pressure plate (5) is sleeved on the wheel hub cylinder (64), and the pressure plate plug-in protrusion (51) is inserted into the corresponding first plug-in neutral position (60); a retaining groove (641) is circumferentially arranged on the outer peripheral wall of the left side of the wheel hub cylinder (64); an annular retaining spring (65) is arranged on the retaining groove (641), and the armature pressure plate (5) is axially limited between the annular retaining spring (65) and the wheel hub plug-in protrusion (61).

4. The electromagnetic clutch structure according to claim 2, characterized in that: A plurality of claw plate plug-in protrusions (71) are arranged at intervals along the circumferential direction on the inner circumferential wall of the active claw plate (7), and each claw plate plug-in protrusion (71) protrudes radially. The claw plate plug-in protrusions (71) are axially aligned and abutted with the pressure plate plug-in protrusions (51); a second plug-in gap (70) is formed between two adjacent claw plate plug-in protrusions (71) to be plug-fitted with the wheel hub plug-in protrusion (61).

5. The electromagnetic clutch structure according to claim 1, characterized in that: The spring seat is a convex disc (62) arranged on the outer peripheral wall of the right end of the output wheel hub (6); an abutment plane (72) is arranged on the right end surface of the active claw disc (7) along the circumferential direction; the spring (8) is sleeved on the wheel hub plug-in convex block (61), and the left end of the spring (8) abuts on the abutment plane (72); the right end of the spring (8) abuts on the left end surface of the convex disc (62).

6. The electromagnetic clutch structure according to claim 1, characterized in that: The left end surface of the passive claw disk (9) is provided with a first meshing tooth surface (91) along the circumferential direction; the right end surface of the active claw disk (7) is provided with a second meshing tooth surface (73) along the circumferential direction; in a meshing state, the first meshing tooth surface (91) is meshedly connected with the second meshing tooth surface (73).

7. The electromagnetic clutch structure according to claim 1, characterized in that: The coil assembly comprises a coil support (2) and a coil (3); the coil support (2) comprises an annular coil sleeve (21) and an annular coil cover (22); a coil mounting groove (23) is circumferentially arranged on the side wall of the annular coil sleeve (21); the coil (3) is circumferentially mounted in the coil mounting groove (23), the annular coil cover (22) is mounted on the annular coil sleeve (21), and the coil (3) is limited between the annular coil sleeve (21) and the annular coil cover (22).

8. The electromagnetic clutch structure according to claim 7, characterized in that: A first annular step (221) is circumferentially arranged on the inner circumferential wall of the annular coil cover (22); a second annular step (52) is circumferentially arranged on the outer circumferential wall of the armature pressure plate (5); the armature sleeve (4) is axially limited on the second annular step (52), and the coil assembly is energized to provide electromagnetic force to drive the armature sleeve (4) to move rightward and be limited on the first annular step (221).

9. The electromagnetic clutch structure according to claim 1, characterized in that: An inner spline groove (63) connected to the gearbox shaft is provided on the inner wall of the output hub (6).

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