Shaft sleeve type transmission mechanism and electromagnetic clutch

Abstract

The utility model discloses a shaft sleeve type transmission mechanism and an electromagnetic clutch, and the shaft sleeve type transmission mechanism comprises a middle shaft, a shaft sleeve and a gear shaft; the gear shaft rotationally sleeves the middle shaft, and a first tooth row structure is arranged on the peripheral surface of the gear shaft; the shaft sleeve is movably sleeved on the middle shaft along the axial direction of the shaft sleeve, and part of the sleeve section is sleeved on the gear shaft; a second tooth row structure capable of being meshed with the first tooth row structure is arranged on the inner circumferential face of the shaft sleeve. A reset elastic piece is connected between the shaft sleeve and the middle shaft; the reset elastic piece is used for providing elastic acting force for resetting movement of the shaft sleeve in the axial direction of the shaft sleeve. A first stop part is arranged on the peripheral surface of the gear shaft and can be in contact with and abut against the shaft sleeve; when the shaft sleeve abuts against the first stop part in a contact mode, the first tooth row structure and the second tooth row structure are completely meshed. And meshing is carried out in a tooth row structure form, so that the combining and separating path is shortened, the meshing time is shortened, and the response time is shortened under the condition that enough torque transmission capacity is achieved.

Description

Technical Field

[0001] This application relates to the field of automotive transmission technology, and in particular to a bushing-type transmission mechanism and an electromagnetic clutch. Background Technology

[0002] A clutch is typically located between the engine and the transmission. Similar to a switch, it's a device that can temporarily separate or engage the power transmission between the engine and the transmission. During operation, the driving and driven parts of the clutch can temporarily separate and gradually engage, and may even rotate relative to each other during transmission.

[0003] An electromagnetic clutch is a type of clutch that primarily relies on the switching of an energized coil to control engagement and disengagement. The response time and torque transmission capacity of the power transmission components affect the power transmission efficiency. The response time is related to the distance between the engagement and disengagement of these components. To ensure sufficient torque transmission, existing electromagnetic clutches typically have large tooth thicknesses. However, the engagement and disengagement path is related to the tooth thickness; the larger the tooth thickness, the longer the path the teeth need to travel, resulting in a longer response time. Furthermore, during rotation, the friction generated between the components due to varying rotational speeds further prolongs the response time. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a bushing-type transmission mechanism and an electromagnetic clutch that accelerates response time while ensuring sufficient torque transmission capacity.

[0005] To achieve the above technical objectives, this application provides a bushing-type transmission mechanism, including a central shaft, a bushing, and a gear shaft;

[0006] The gear shaft is rotatably mounted on the central shaft, and its outer circumferential surface is provided with a first gear row structure;

[0007] The bushing is movably fitted onto the central shaft along its own axial direction, and a portion of the bushing is fitted onto the gear shaft;

[0008] The inner circumferential surface of the bushing is provided with a second toothed structure that can mesh with the first toothed structure.

[0009] A reset elastic element is connected between the bushing and the central shaft;

[0010] The reset elastic element is used to provide an elastic force for the bushing to reset along its own axial direction;

[0011] The outer circumferential surface of the gear shaft is provided with a first stop portion, which can contact and abut against the bushing.

[0012] When the bushing contacts and abuts against the first stop, the first toothed structure and the second toothed structure are fully engaged.

[0013] Furthermore, the outer peripheral surface of the central shaft is provided with a first elastic limiting portion;

[0014] The inner circumferential surface of the bushing is provided with a second elastic limiting part corresponding to the first elastic limiting part;

[0015] The reset elastic element is installed between the first elastic limiting part and the second elastic limiting part, and its two ends respectively contact and abut against the first elastic limiting part and the second elastic limiting part.

[0016] Furthermore, there are multiple reset elastic elements, which are evenly distributed around the central axis circumference.

[0017] Furthermore, the reset elastic element is a compression spring.

[0018] Furthermore, the outer peripheral surface of the central shaft located on the side of the shaft sleeve away from the gear shaft is provided with a first retaining ring groove;

[0019] The first snap ring is installed in the first snap ring slot;

[0020] The first retaining ring can contact and abut against the bushing.

[0021] This application also discloses an electromagnetic clutch, including an electromagnetic coil assembly, a push ring assembly, and the aforementioned bushing-type transmission mechanism;

[0022] The push ring assembly is mounted on the bushing of the bushing-type transmission mechanism;

[0023] The electromagnetic coil assembly is mounted outside the push ring assembly and is used to drive the push ring assembly to move by the electromagnetic force generated by energizing it, so as to drive the bushing to move closer to the gear shaft along its own axial direction.

[0024] Furthermore, the push ring assembly includes an inner push ring and an outer push ring;

[0025] The inner ring of the push ring is fixed to the outer circumferential surface of the bushing;

[0026] The outer ring of the push ring is fitted onto the outer circumferential surface of the inner ring of the push ring.

[0027] Furthermore, a second stop is provided on the outer circumferential surface of the bushing;

[0028] The second stop portion contacts and abuts against one end of the inner ring of the push ring;

[0029] The outer circumferential surface of the bushing is also provided with a second snap ring groove;

[0030] A second snap ring is installed on the second snap ring groove;

[0031] The second retaining ring contacts and abuts against the other end of the inner ring of the push ring;

[0032] The inner ring of the push ring has a third stop on its outer circumferential surface, which abuts against one end of the outer ring of the push ring.

[0033] Furthermore, the electromagnetic coil assembly includes an end cap, a coil component, and a housing;

[0034] The end cap and the housing are coaxially arranged and connected to each other;

[0035] The coil is installed between the end cap and the housing and is wrapped with a wrapping cloth.

[0036] Furthermore, a fixing block is fixed to the outside of the housing;

[0037] The fixing block is provided with a first wire through hole;

[0038] The housing is provided with a second wire through hole that penetrates itself and connects to the first wire through hole;

[0039] The fixing block is used to fix the wires connecting the coil component.

[0040] As can be seen from the above technical solutions, the bushing transmission mechanism designed in this application redesigns the traditional whole tooth structure into a first tooth row structure and a second tooth row structure composed of multiple small rows of teeth with a certain tooth thickness. The meshing is performed in the form of tooth row structure, which greatly shortens the path between the tooth shaft and the bushing (power transmission component) for mutual engagement or separation, significantly reduces the meshing time, and also indirectly shortens the friction path, further reducing the engagement time. This allows the response time to be greatly accelerated while having sufficient torque transmission capacity. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a front sectional view of an electromagnetic clutch provided in this application;

[0043] Figure 2 for Figure 1 Enlarged diagram of position A in the middle;

[0044] Figure 3 For based on Figure 1 A sectional view of section line a in the diagram;

[0045] Figure 4For based on Figure 1 A sectional view of section line b in the diagram;

[0046] Figure 5 This is a perspective view of the bushing of a bushing-type transmission mechanism provided in this application after being cut in half (1 / 4 section).

[0047] Figure 6 A perspective view of the gear shaft of a bushing-type transmission mechanism provided in this application;

[0048] Figure 7 A perspective view of the central shaft of a bushing-type transmission mechanism provided in this application;

[0049] In the diagram: 1. Electromagnetic coil assembly; 2. Push ring assembly; 3. Bushing; 31. Internal spline structure; 4. Gear shaft; 5. Central shaft; 51. External spline structure; 6. First bearing; 7. Reset elastic element; 8. Second snap ring; 9. First snap ring; 10. Second bearing; 11. End cap; 12. Coil assembly; 13. Threaded fastener; 14. Winding cloth; 15. Fixing block; 151. First wire hole; 16. Housing; 161. Second wire hole; 21. Inner ring of push ring; 22. Outer ring of push ring; 301. Second limiting groove; 501. First limiting groove; 601. Bearing groove; 701. Reset elastic groove; 801. Second snap ring groove; 901. First snap ring groove; 302. Second toothed structure; 402. First toothed structure; 303. Second stop; 403. First stop; 305. Second elastic limiting part; 505. First elastic limiting part; 214. Third stop. Detailed Implementation

[0050] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the embodiments of this application.

[0051] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0053] This application discloses a bushing-type transmission mechanism and an electromagnetic clutch.

[0054] Please see Figure 1 , 2 5 to 7, one embodiment of a bushing-type transmission mechanism provided in this application includes:

[0055] Central shaft 5, bushing 3, and gear shaft 4.

[0056] The gear shaft 4 is rotatably mounted on the central shaft 5, and the outer circumferential surface is provided with a first gear row structure 402.

[0057] Specifically, such as Figure 1 As shown, the gear shaft 4 is rotatably connected to the central shaft 5 via a first bearing 6, wherein the first bearing 6 can be a cylindrical roller bearing (the gear shaft 4 has a bearing groove 601 for mounting the first bearing 6). Second bearings 10, which can be ball bearings, are mounted on both the end of the gear shaft 4 away from the central shaft 5 and the end of the central shaft 5 away from the gear shaft 4. The first gear rack structure 402 is as follows... Figure 6 As shown, the first tooth row structure 402 is composed of multiple small rows of teeth with a certain tooth thickness. The small rows of teeth are tooth ring structures distributed around the outer circumference of the tooth shaft 4.

[0058] The bushing 3 is movably fitted onto the central shaft 5 along its own axial direction, and part of the bushing is fitted onto the gear shaft 4.

[0059] Specifically, such as Figure 5 As shown, the inner circumferential surface of the bushing 3 is provided with an inner spline structure 31, which is used to cooperate with the outer spline structure 51 on the central shaft 5 to achieve movable setting along its own axial direction.

[0060] The inner circumferential surface of the bushing 3 is provided with a second toothed structure 302 that can mesh with the first toothed structure 402; such as Figure 5 As shown, the second tooth row structure 302 is also composed of multiple small tooth rows with a certain tooth thickness. The small tooth rows are tooth ring structures distributed around the inner circumference of the bushing 3.

[0061] A reset elastic element 7 is connected between the bushing 3 and the central shaft 5. The reset elastic element 7 is used to provide the elastic force for the bushing 3 to reset along its own axial direction.

[0062] A first stop 403 is provided on the outer circumferential surface of the gear shaft 4, which can contact and abut against the bushing 3; when the bushing 3 contacts and abuts against the first stop 403, the first gear row structure 402 and the second gear row structure 302 are fully engaged.

[0063] like Figure 2 As shown in Figure 6, the first stop 403 is a ring-shaped stepped structure.

[0064] The bushing-type transmission mechanism designed in this application redesigns the traditional whole-tooth structure into a first tooth row structure 402 and a second tooth row structure 302 composed of multiple small rows of teeth with a certain tooth thickness. The meshing is performed in the form of a tooth row structure, which greatly shortens the path between the gear shaft 4 and the bushing 3 (power transmission component) for mutual engagement or disengagement, significantly reduces the meshing time, and indirectly shortens the friction path, further reducing the engagement time. This allows the response time to be greatly accelerated while having sufficient torque transmission capacity.

[0065] The above is Embodiment 1 of a bushing-type transmission mechanism provided in this application. The following is Embodiment 2 of a bushing-type transmission mechanism provided in this application. Please refer to the following for details. Figures 1 to 7 .

[0066] Based on the solution of Embodiment 1 above:

[0067] Furthermore, the outer peripheral surface of the central shaft 5 is provided with a first elastic limiting part 505; the inner peripheral surface of the bushing 3 is provided with a second elastic limiting part 305 corresponding to the first elastic limiting part 505.

[0068] like Figure 1 , 2 as well as Figure 7 As shown, the first elastic limiting part 505 is a structure that restricts the left end of the reset elastic member 7. Specifically, a first limiting groove 501 is provided on the central shaft 5 along its own axial direction, wherein one end of the first limiting groove 501 is designed to be open, and the other end is designed to be closed, and the closed end forms the aforementioned first elastic limiting part 505.

[0069] like Figure 1 , 2 as well as Figure 5 As shown, the second elastic limiting part 305 is a structure that restricts the right end of the reset elastic member 7. Specifically, a second limiting groove 301 is provided in the bushing 3 along its own axial direction, wherein one end of the second limiting groove 301 is designed to be open, and the other end is designed to be closed, and the closed end forms the aforementioned second elastic limiting part 305.

[0070] The reset elastic member 7 is installed between the first elastic limiting part 505 and the second elastic limiting part 305, and its two ends are respectively in contact with and abut against the first elastic limiting part 505 and the second elastic limiting part 305.

[0071] like Figure 2 As shown, the first limiting groove 501 and the second limiting groove 301 form a reset elastic groove 701 for accommodating the reset elastic member 7.

[0072] Furthermore, to enhance the elastic reset effect, multiple reset elastic elements 7 can be designed and evenly distributed around the circumference of the central axis 5. Correspondingly, multiple first limiting grooves 501 and second limiting grooves 301 are also provided, each corresponding to one of the reset elastic elements 7.

[0073] Furthermore, the reset elastic element 7 is a compression spring, which is easy to install and simple to maintain.

[0074] Further, if Figure 2 As shown, the outer circumferential surface of the central shaft 5, located on the side of the shaft sleeve 3 away from the gear shaft 4, is provided with a first retaining spring groove 901. A first retaining spring 9 is installed in the first retaining spring groove 901, and the first retaining spring 9 can contact and abut against the shaft sleeve 3. The first retaining spring 9 is used to limit and fix the shaft sleeve 3. This method is convenient for installation and disassembly, and facilitates the disassembly and maintenance of the shaft sleeve 3.

[0075] like Figures 1 to 7 As shown, this application also discloses an electromagnetic clutch, including an electromagnetic coil assembly 1, a push ring assembly 2, and a bushing-type transmission mechanism; the push ring assembly 2 is mounted on the bushing 3 of the bushing-type transmission mechanism; the electromagnetic coil assembly 1 is mounted outside the push ring assembly 2 and is used to drive the push ring assembly 2 to move by the electromagnetic force generated by energization, thereby driving the bushing 3 to move closer to the gear shaft 4 along its own axial direction. It can be understood that the electromagnetic coil assembly 1 itself is fixed, and the push ring assembly 2 is driven to move by the electromagnetic force generated by energization, which in turn drives the bushing 3 to move.

[0076] Further, if Figures 1 to 4 As shown, the push ring assembly 2 includes an inner push ring 21 and an outer push ring 22; the inner push ring 21 is fitted onto the outer circumferential surface of the bushing 3; the outer push ring 22 is fitted onto the outer circumferential surface of the inner push ring 21. It should be noted that, in order to achieve a faster response time, the inner push ring 21 and the outer push ring 22 are interference-fitted, and both are fixed relative to the left end of the inner push ring 21.

[0077] In addition, the outer ring 22 of the push ring in this application is designed with a magnetic material, while the inner ring 21 of the push ring is designed with a non-magnetic material.

[0078] Further, if Figure 2As shown, a second stop 303 is provided on the outer circumferential surface of the bushing 3; the second stop 303 contacts and abuts one end of the inner ring 21 of the push ring; the second stop 303 is used to limit the left end of the inner ring 21 of the push ring, and it has an annular stepped structure.

[0079] The outer circumferential surface of the bushing 3 is also provided with a second retaining circumferential groove 801, on which a second retaining circumferential 8 is installed. The second retaining circumferential 8 contacts and abuts against the other end of the inner ring 21 of the push ring. The second retaining circumferential 8 is used to limit the right end of the inner ring 21 of the push ring. The second retaining circumferential 8 is used to limit and fix the inner ring 21 of the push ring. This method is convenient for installation and disassembly, and facilitates the disassembly and maintenance of the bushing 3.

[0080] In this application, the limiting design of the first stop 403 and the second stop 303 is a shoulder limiting. This limiting method has a simple structure and accurate positioning. This limiting method is used to limit one end of the structural component to be limited; then the first snap ring 9 pieces and the second snap ring 8 pieces are used to limit the other end of the structural component to be limited. While satisfying reliable limiting, it also facilitates the disassembly and maintenance of the structural component to be limited.

[0081] like Figure 2 As shown, the outer circumferential surface of the inner ring 21 of the push ring is provided with a third stop 214, which contacts and abuts against one end of the outer ring 22 of the push ring. The third stop 214 provided on the outer circumferential surface of the inner ring 21 of the push ring is used to limit the left end of the outer ring 22 of the push ring (that is, to realize that the inner ring 21 of the push ring and the outer ring 22 of the push ring are relatively fixed to the left end of the inner ring 21 of the push ring). The third stop 214 is a boss structure.

[0082] When the electromagnetic coil assembly 1 is energized, it generates a magnetic force, causing the outer ring 22 of the push ring to push against the third stop 214 of the inner ring 21 of the push ring and move to the left along the axis together with the inner ring 21 of the push ring. As a result, the push ring assembly 2 moves to the left under the action of electromagnetic force. During the movement, the inner ring 21 of the push ring pushes against the second stop 303 of the bushing 3, thereby driving the bushing 3 to move to the left.

[0083] Further, if Figures 1 to 4 As shown, the electromagnetic coil assembly 1 includes an end cap 11, a coil component 12, and a housing 16.

[0084] The end cap 11 and the housing 16 are coaxially arranged and connected to each other; the coil 12 is installed between the end cap 11 and the housing 16 and is wrapped with a winding cloth 14.

[0085] The electromagnetic coil assembly 1 and the push ring assembly 2 in this application can be designed with reference to existing design structures, and will not be described in detail here.

[0086] Further, if Figure 1 As shown in Figure 4, a fixing block 15 is fixed to the outside of the housing 16. Specifically, it can be fixedly connected by threaded fasteners 13 (such as Phillips head countersunk screws), without any restrictions.

[0087] The fixing block 15 is provided with a first wire through hole; the housing 16 is provided with a second wire through hole that passes through itself and communicates with the first wire through hole; the fixing block 15 is used to fix the wires of the connecting coil 12. By setting the fixing block 15, the wires of the connecting coil 12 can be fixed, ensuring the reliability of the circuit connection.

[0088] The working principle is as follows:

[0089] 1. When energized, the electromagnetic coil assembly 1 generates a magnetic field. The resulting electromagnetic force causes the outer ring 22 of the push ring to move to the left along the axis together with the inner ring 21 of the push ring, pressing against the third stop 214. During this movement, the inner ring 21 of the push ring presses against the second stop 303, thereby pushing the bushing 3 to move to the left along the axis (for a faster response time, the inner ring 21 of the push ring is initially in a state of pressing against the second stop 303). During the leftward movement, the second tooth row of the bushing 3 and the first tooth row of the gear shaft 4 rapidly mesh within a certain speed difference. The second elastic limiting part 305 begins to compress the reset elastic element 7, and the reset elastic element 7 presses against the first elastic limiting part 505, continuing to move to the left. When the left end face of the bushing 3 abuts against the first stop 403, it restricts the bushing 3 and the push ring assembly 2 from continuing to move to the left along the axial direction. The compression of the reset elastic element 7 reaches its maximum. At this time, the first tooth row and the second tooth row are fully engaged, which can smoothly output sufficient torque. The mutual engagement or separation path of this process is very short, which makes the engagement time short and the response fast.

[0090] 2. When the power is off, the magnetic field generated by the electromagnetic coil assembly 1 disappears, causing the electromagnetic force to disappear. The reset elastic element 7 begins to return to its original position, and the resulting elastic force pushes the second elastic limiting part 305 to the right. The bushing 3 begins to move to the right along the axis, and the second tooth row of the bushing 3 and the first tooth row of the gear shaft 4 begin to gradually separate. At this time, the second stop part 303 abuts against the third stop part 214, and the third stop part 214 abuts against the left end face of the outer ring 22 of the push ring. Thus, during the reset process, the reset elastic element 7 pushes the bushing 3 axially, causing the push ring assembly 2 to move to the right. It stops moving when it reaches the first retaining spring 9, at which point the reset is complete.

[0091] The above provides a detailed description of a bushing-type transmission mechanism and an electromagnetic clutch provided in this application. For those skilled in the art, based on the ideas of the embodiments of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A bushing-type transmission mechanism, characterized in that, Includes central shaft (5), bushing (3) and gear shaft (4); The gear shaft (4) is rotatably mounted on the central shaft (5), and the outer circumferential surface is provided with a first gear row structure (402). The bushing (3) is movably fitted onto the central shaft (5) along its own axial direction, and a portion of the bushing is fitted onto the gear shaft (4); The inner circumferential surface of the bushing (3) is provided with a second toothed structure (302) that can mesh with the first toothed structure (402). A reset elastic element (7) is connected between the bushing (3) and the central shaft (5). The reset elastic element (7) is used to provide the elastic force for the bushing (3) to reset along its own axial direction; The outer circumferential surface of the gear shaft (4) is provided with a first stop (403), which can contact and abut against the bushing (3); When the bushing (3) comes into contact with the first stop (403), the first toothed structure (402) and the second toothed structure (302) are fully engaged.

2. The bushing-type transmission mechanism according to claim 1, characterized in that, The outer peripheral surface of the central shaft (5) is provided with a first elastic limiting part (505); The inner circumferential surface of the bushing (3) is provided with a second elastic limiting part (305) corresponding to the first elastic limiting part (505). The reset elastic element (7) is installed between the first elastic limiting part (505) and the second elastic limiting part (305), and its two ends respectively contact and abut against the first elastic limiting part (505) and the second elastic limiting part (305).

3. The bushing-type transmission mechanism according to claim 1, characterized in that, The reset elastic element (7) is multiple and is evenly distributed around the circumference of the central axis (5).

4. The bushing-type transmission mechanism according to claim 1, characterized in that, The reset elastic element (7) is a compression spring.

5. The bushing-type transmission mechanism according to claim 1, characterized in that, The outer circumferential surface of the central shaft (5) located on the side of the shaft segment away from the gear shaft (4) of the bushing (3) is provided with a first snap ring groove (901). The first retaining ring groove (901) is fitted with a first retaining ring (9); The first snap ring (9) can contact and abut against the bushing (3).

6. An electromagnetic clutch, characterized in that, It includes an electromagnetic coil assembly (1), a push ring assembly (2), and a bushing-type transmission mechanism as described in any one of claims 1 to 5; The push ring assembly (2) is mounted on the bushing (3) of the bushing-type transmission mechanism; The electromagnetic coil assembly (1) is installed outside the push ring assembly (2) and is used to drive the push ring assembly (2) to move by the electromagnetic force generated by energizing, so as to drive the bushing (3) to move closer to the gear shaft (4) along its own axial direction.

7. The electromagnetic clutch according to claim 6, characterized in that, The push ring assembly (2) includes an inner push ring (21) and an outer push ring (22); The inner ring (21) of the push ring is fitted onto the outer circumferential surface of the bushing (3); The outer ring (22) of the push ring is fitted onto the outer circumferential surface of the inner ring (21) of the push ring.

8. The electromagnetic clutch according to claim 7, characterized in that, The bushing (3) has a second stop (303) on its outer circumferential surface. The second stop (303) contacts and abuts against one end of the inner ring (21) of the push ring; The outer circumferential surface of the bushing (3) is also provided with a second snap ring groove (801); A second snap ring (8) is installed on the second snap ring groove (801); The second retaining ring (8) contacts and abuts against the other end of the inner ring (21) of the push ring; The outer circumferential surface of the inner ring (21) of the push ring is provided with a third stop (214), which abuts against one end of the outer ring (22) of the push ring.

9. The electromagnetic clutch according to claim 8, characterized in that, The electromagnetic coil assembly (1) includes an end cap (11), a coil component (12), and a housing (16). The end cap (11) and the housing (16) are coaxially arranged and connected to each other; The coil component (12) is installed between the end cap (11) and the housing (16) and is wrapped with a wrapping cloth (14).

10. The electromagnetic clutch according to claim 9, characterized in that, A fixing block (15) is fixed to the outside of the housing (16); The fixing block (15) is provided with a first wire through hole; The housing (16) is provided with a second wire through hole that penetrates itself and connects to the first wire through hole; The fixing block (15) is used to fix the wires connected to the coil (12).

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