Electromagnetic brake

Abstract

The utility model relates to the field of brakes, in particular to an electromagnetic brake which comprises a brake disc, an armature, a magnet yoke and an adjusting bolt, the brake disc is rotationally connected to the magnet yoke and connected to a motor rotating shaft, the armature is slidably connected between the magnet yoke and the brake disc, and the adjusting bolt comprises an adjusting part, a sliding part and a threaded part. One end of the threaded part is connected to the other end of the sliding part, the armature is provided with a connecting hole, the sliding part is embedded in the connecting hole, the magnet yoke is provided with a fixing hole, the threaded part is in threaded connection with the fixing hole, the periphery of the threaded part is connected with a locking piece, and the locking piece abuts against the hole wall of the fixing hole. The adjusting bolt penetrates through the connecting hole and then is in threaded connection with the fixing hole, the locking piece abuts against the hole wall of the fixing hole, friction force between the adjusting bolt and the hole wall of the fixing hole is increased, relative fixing of the adjusting bolt and the magnet yoke is achieved, the possibility that the adjusting bolt deflects in the packaging and transporting process is reduced, and the reliability of the electromagnetic brake is improved. And the electromagnetic brake can be conveniently mounted on the motor subsequently.

Description

Technical Field

[0001] This application relates to the field of brakes, and more particularly to an electromagnetic brake. Background Technology

[0002] Electromagnetic brakes, also known as electromagnetic clutches, are installed on the shaft or rotating device of a motor. They control the engagement and disengagement of a mechanical friction disc through electromagnetic force to achieve braking control of components, enabling rapid braking or accurate positioning. They are the most commonly used mechanical brakes in elevators.

[0003] Existing electromagnetic brakes connect the armature and the yoke by adjusting bolts, ensuring that each area of ​​the armature and the yoke maintain the same gap to guarantee the brake can function properly.

[0004] Currently, to facilitate the production and installation of subsequent motors, electromagnetic brakes are often assembled and debugged during production. However, during packaging or transportation, the adjusting bolts are easily touched by external objects, causing the adjusting bolts to rotate. This results in a shift in the gap between the armature and the yoke, affecting the normal use of the brake. Utility Model Content

[0005] In order to reduce the possibility of the adjusting bolt being deflected by an external object and to improve the reliability of the electromagnetic brake, this application provides an electromagnetic brake.

[0006] The electromagnetic brake provided in this application adopts the following technical solution:

[0007] An electromagnetic brake includes a brake disc, an armature, a magnetic yoke, and an adjusting bolt. The brake disc is rotatably connected to the magnetic yoke and is coaxially connected to a motor shaft. The armature is slidably connected between the magnetic yoke and the brake disc, with the sliding direction of the armature parallel to the rotation axis of the brake disc. The adjusting bolt includes an adjusting part, a sliding part, and a threaded part. One end of the sliding part is connected to the adjusting part, and one end of the threaded part is connected to the other end of the sliding part. The armature has a connecting hole, and the sliding part is embedded in the connecting hole. The magnetic yoke has a fixing hole, and the threaded part is threadedly connected to the fixing hole. A locking member is connected to the outer periphery of the threaded part, and the locking member abuts against the wall of the fixing hole.

[0008] By adopting the above technical solution, the adjusting bolt passes through the connecting hole and is threadedly connected to the fixing hole. The locking part is connected to the outer periphery of the threaded part of the adjusting bolt and abuts against the wall of the fixing hole, increasing the friction between the adjusting bolt and the wall of the fixing hole, thereby achieving relative fixation of the adjusting bolt and the magnetic yoke, reducing the possibility of the adjusting bolt deflecting during packaging and transportation, improving the reliability of the electromagnetic brake, and facilitating the subsequent installation of the electromagnetic brake on the motor.

[0009] Preferably, it also includes a fixing bolt, the magnetic yoke has a mounting hole that communicates with the fixing hole, the adjusting bolt has a through hole, and the fixing bolt passes through the mounting hole and the through hole in sequence and is threadedly connected to the motor housing.

[0010] By adopting the above technical solution, the magnetic yoke is provided with mounting holes, which are connected to the fixing holes. The adjusting bolt is provided with through holes, and the fixing bolt passes through the mounting holes and through holes in sequence and is threadedly connected to the motor housing, which facilitates the assembly of the electromagnetic brake and the motor.

[0011] Preferably, it also includes friction pads, which are connected to one side of the brake disc along the rotation axis of the brake disc. There are two friction pads, and the two friction discs are symmetrically distributed along the rotation axis of the brake disc.

[0012] By adopting the above technical solution, setting two friction pads symmetrically distributed along the rotation axis of the brake disc can effectively increase the braking torque, improve the braking efficiency and stability of the electromagnetic brake, facilitate the replacement of the friction pads to ensure the reliability of the electromagnetic brake, and extend the service life of the electromagnetic brake.

[0013] Preferably, it also includes a connecting bushing, wherein an internal spline is coaxially provided on the inner wall of the brake disc, and an external spline is provided on the outer periphery of the connecting bushing, the internal spline and the external spline cooperate, and a keyway is provided on the inner wall of the connecting bushing, and the connecting bushing is circumferentially fixedly connected to the motor shaft through the keyway.

[0014] By adopting the above technical solution, the combination of internal and external splines enables precise positioning of the brake disc and the connecting bushing, enhances the connection strength between the brake disc and the connecting bushing, reduces the possibility of relative slippage between the brake disc and the connecting bushing during high torque transmission, facilitates the replacement of the brake disc or the connecting bushing, and improves the reliability and service life of the electromagnetic brake.

[0015] Preferably, the device further includes a sleeve, which is coaxially connected to the outer periphery of the magnetic yoke, with the inner wall of the sleeve fitting against the outer wall of the magnetic yoke, and the end of the sleeve away from the magnetic yoke used to abut against the motor housing.

[0016] By adopting the above technical solution, the sleeve is coaxially connected to the outer periphery of the magnetic yoke, and the inner wall of the sleeve is in close contact with the outer wall of the magnetic yoke. This reduces the possibility of external impurities entering the electromagnetic brake and affecting its braking effect, thereby improving the reliability and service life of the electromagnetic brake.

[0017] Preferably, it also includes a connecting bolt. The sleeve is slidably connected to the outer periphery of the magnetic yoke on the same axis. A connecting rod is connected to the other end of the sleeve. A protrusion is connected to the outer periphery of the magnetic yoke. A groove is provided on the side of the connecting rod near the magnetic yoke. The protrusion is slidably embedded in the groove. The sliding direction of the protrusion is parallel to the axial direction of the sleeve. A connecting groove is provided on the groove wall. The protrusion is provided with a locking hole. The locking hole communicates with the connecting groove. The connecting bolt passes through the connecting groove and is threadedly connected to the locking hole to achieve relative fixation of the sleeve and the magnetic yoke.

[0018] By adopting the above technical solution, the protrusion is slidably embedded in the groove, which guides the sliding of the sleeve. After the connecting bolt passes through the connecting groove, it is threaded into the locking hole. The head of the connecting bolt abuts against the connecting rod, thereby achieving a fixed connection between the sleeve and the magnetic yoke.

[0019] Preferably, the device further includes a first airbag, a sliding plate, and a first resetting member. The outer periphery of the magnetic yoke is provided with a first annular groove, the first airbag is embedded in the first annular groove, the outer wall of the first airbag abuts against the inner wall of the sleeve, the bottom of the locking hole is provided with a receiving groove, and the groove wall on the side away from the locking hole is provided with a first connecting channel, which communicates with the first airbag. The sliding plate is slidably embedded in the receiving groove, and the sliding direction of the sliding plate is parallel to the axial direction of the locking hole. The surface of the sliding plate away from the bottom of the receiving groove is used for the connecting bolt to abut. The first resetting member is connected between the sliding plate and the magnetic yoke, and the first resetting member causes the sliding plate to tend to move away from the first connecting channel.

[0020] By adopting the above technical solution, the connecting bolt abuts against the sliding plate, pushing the sliding plate to overcome the elastic sliding of the first reset member, and pressing the gas in the receiving groove into the first airbag, so that the first airbag expands and presses against the inner wall of the sleeve, improving the sealing performance between the sleeve and the magnetic yoke, reducing the possibility of external impurities entering the electromagnetic brake from the connection between the sleeve and the magnetic yoke, and improving the reliability and service life of the electromagnetic brake.

[0021] Preferably, it further includes a second airbag, an abutment ring, and a second reset member. The inner wall of the sleeve is provided with a second annular groove, the second airbag is embedded in the second annular groove, and the inner wall of the second airbag abuts against the motor housing. The end of the sleeve away from the magnetic yoke is provided with a third annular groove coaxially, the third annular groove is connected to the second airbag, the abutment ring is coaxially slidably embedded in the third annular groove, and the second reset member is connected between the sleeve and the abutment ring. The second reset member causes the abutment ring to tend to move away from the magnetic yoke.

[0022] By adopting the above technical solution, the abutting ring abuts against the motor housing, and the abutting ring overcomes the elastic force of the second reset member and is embedded in the third ring groove, which forces the gas in the third ring groove into the second air bladder. This causes the second air bladder to expand and press against the outer wall of the motor housing, thereby improving the sealing performance between the sleeve and the motor housing, reducing the possibility of external impurities entering the electromagnetic brake from the connection between the sleeve and the motor housing, and improving the reliability and service life of the electromagnetic brake.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. After the adjusting bolt passes through the connecting hole, it is threaded into the fixing hole. The locking part is connected to the outer circumference of the threaded part of the adjusting bolt. The locking part abuts against the wall of the fixing hole, increasing the friction between the adjusting bolt and the wall of the fixing hole, thereby achieving relative fixation of the adjusting bolt and the magnetic yoke, reducing the possibility of the adjusting bolt deflecting during packaging and transportation, improving the reliability of the electromagnetic brake, and facilitating the subsequent installation of the electromagnetic brake on the motor.

[0025] 2. The connecting bolt abuts against the sliding plate, pushing the sliding plate to overcome the elasticity of the first reset member and slide, pressing the gas in the receiving groove into the first airbag, so that the first airbag expands and presses against the inner wall of the sleeve, improving the sealing performance between the sleeve and the magnetic yoke, reducing the possibility of external impurities entering the electromagnetic brake from the connection between the sleeve and the magnetic yoke, and improving the reliability and service life of the electromagnetic brake.

[0026] 3. The abutting ring abuts against the motor housing. The abutting ring overcomes the elastic force of the second reset member and embeds itself into the third ring groove, forcing the gas in the third ring groove into the second air bladder. This causes the second air bladder to expand and press against the outer wall of the motor housing, improving the sealing performance between the sleeve and the motor housing, reducing the possibility of external impurities entering the electromagnetic brake from the connection between the sleeve and the motor housing, and improving the reliability and service life of the electromagnetic brake. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view of an electromagnetic brake.

[0028] Figure 2 This is a structural diagram of the adjusting bolt and locking mechanism.

[0029] Figure 3 yes Figure 1 Enlarged view of point A in the middle.

[0030] Figure 4 This is a schematic diagram of the exploded structure of an electromagnetic brake.

[0031] Figure 5 This is an exploded structural diagram of the magnetic yoke, armature, and dustproof assembly.

[0032] Figure 6This is a partial cross-sectional view of an electromagnetic brake.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Magnetic yoke; 11. Stator; 111. Fixing hole; 112. Mounting hole; 113. Protrusion; 1131. Locking hole; 114. First annular groove; 115. Receiving groove; 116. First connecting channel; 117. Groove; 118. Insert groove; 119. First mounting groove; 1110. Second mounting groove; 12. Coil assembly; 13. Fixing plate; 14. Brake spring;

[0035] 2. Armature; 21. Connecting hole;

[0036] 3. Braking assembly; 31. Brake disc; 311. Internal spline; 312. Fourth annular groove; 32. Friction pad; 33. Connecting bushing; 331. External spline; 332. Keyway;

[0037] 4. Adjusting bolt; 41. Adjusting part; 42. Sliding part; 43. Threaded part; 44. Through hole;

[0038] 5. Locking components;

[0039] 6. Fixing bolts;

[0040] 7. Dustproof component; 71. Sleeve; 711. Connecting rod; 7111. Slide groove; 7112. Connecting groove; 712. Second annular groove; 713. Third annular groove; 714. Second connecting channel; 72. Connecting bolt; 73. First airbag; 74. Slide plate; 75. First reset component; 76. Second airbag; 77. Abutment ring; 78. Second reset component. Detailed Implementation

[0041] The present application will be further described in detail below with reference to the accompanying drawings.

[0042] Reference Figure 1 This application discloses an electromagnetic brake comprising a magnetic yoke 1 and an armature 2. The magnetic yoke 1 includes a stator 11, a coil assembly 12, and a fixing plate 13. One end of the stator 11 along its axial direction is coaxially provided with a groove 117, in which the coil assembly 12 is embedded. The fixing plate 13 is also embedded in the groove 117, with the side surface of the fixing plate 13 away from the bottom of the groove 117 flush with one side surface of the stator 11. The armature 2 is coaxially slidably connected to the side of the stator 11 near the fixing plate 13, with the outer wall of the armature 2 flush with the outer wall of the stator 11 and the inner wall of the armature 2 flush with the inner wall of the stator 11.

[0043] Reference Figure 2 and Figure 3An electromagnetic brake also includes an adjusting bolt 4 and a locking element 5. The armature 2 has a plurality of connecting holes 21, which are evenly distributed circumferentially around the axis of the armature 2. In this embodiment, there are three connecting holes 21. The stator 11 has a fixing hole 111 at one end near the armature 2. The number of fixing holes 111, adjusting bolt 4, and locking element 5 is the same as the number of connecting holes 21 and corresponds one-to-one. The adjusting bolt 4 includes an adjusting part 41, a sliding part 42, and a threaded part 43. One end of the sliding part 42 is fixedly connected to the adjusting part 41, and one end of the threaded part 43 is coaxially fixedly connected to the other end of the sliding part 42. In this embodiment, the cross-section of the adjusting part 41 is hexagonal, and the diameter of the threaded part 43 is smaller than the diameter of the sliding part 42. The surface of the adjusting part 41 away from the sliding part 42 abuts against the motor housing. The sliding part 42 is embedded in the connecting hole 21, and the threaded part 43 is threadedly connected to the fixing hole 111. The locking member 5 is coaxially fixed to the outer periphery of the threaded portion 43, and the outer wall of the locking member 5 abuts against the wall of the fixing hole 111. In this embodiment, the locking member 5 is made of rubber.

[0044] Reference Figure 1 and Figure 4 The magnetic yoke 1 also includes a braking spring 14. The stator 11 has a first mounting groove 119 and a second mounting groove 1110 at one end near the fixing plate 13. The first mounting groove 119 is located inside the groove 117, and there are several first mounting grooves 119 evenly distributed circumferentially around the axis of the stator 11. In this embodiment, there are six first mounting grooves 119. The second mounting groove 1110 is located outside the groove 117, and there are several second mounting grooves 1110 evenly distributed circumferentially around the axis of the stator 11. In this embodiment, there are three second mounting grooves 1110, with one second mounting groove 1110 for every two adjacent fixing hole 111 assemblies. The braking spring 14 connects the armature 2 and the stator 11, causing the armature 2 to tend to move away from the stator 11. The number of brake springs 14 is the same as the number of the first mounting slot 119 and the second mounting slot 1110 and they correspond one-to-one. The brake springs 14 are embedded in the first mounting slot 119 and the second mounting slot 1110.

[0045] Reference Figure 1 and Figure 2An electromagnetic brake also includes a fixing bolt 6. The stator 11 has a mounting hole 112 at the end furthest from the armature 2. The mounting hole 112 communicates with the fixing hole 111. The number of mounting holes 112 is the same as the number of fixing holes 111, and they correspond one-to-one. The axis of the mounting hole 112 coincides with the axis of the fixing hole 111. A through hole 44 is coaxially provided at the end of the threaded portion 43 near the mounting hole 112. The through hole 44 passes through the threaded portion 43, the sliding portion 42, and the adjusting portion 41 in sequence. The shank of the fixing bolt 6 passes through the mounting hole 112 and the through hole 44 in sequence and is threadedly connected to the motor housing. A groove 118 is provided in the wall of the mounting hole 112 at the end furthest from the fixing hole 111. The head of the fixing bolt 6 abuts against the bottom of the groove 118.

[0046] Reference Figure 1 and Figure 5 An electromagnetic brake also includes a dustproof component 7, which includes a sleeve 71. The sleeve 71 is coaxially slidably connected to the outer periphery of the stator 11, and the inner wall of the sleeve 71 is in contact with the outer wall of the stator 11.

[0047] Reference Figure 5 and Figure 6The dustproof assembly 7 also includes a first airbag 73, a connecting bolt 72, a sliding plate 74, and a first reset member 75. A first annular groove 114 is provided on the outer periphery of the stator 11, located on the side of the stator 11 near the armature 2. The first airbag 73 is embedded in the first annular groove 114 and is used to press against the inner wall of the sleeve 71. Two protrusions 113 are fixedly connected to the outer wall of the stator 11, symmetrically distributed along the axis of the sleeve 71. A connecting rod 711 is fixedly connected to one end of the sleeve 71. The number of connecting rods 711 is the same as the number of protrusions 113 and corresponds one-to-one. The surface of the connecting plate near the stator 11 is in contact with the outer wall of the stator 11. A sliding groove 7111 is provided on the surface of the connecting rod 711 near the stator 11, with the end of the sliding groove 7111 away from the sleeve 71 penetrating the connecting rod 711. The protrusion 113 is slidably embedded in the groove 7111, and the sidewall of the protrusion 113 is in contact with the groove wall of the groove 7111. A connecting groove 7112 is provided on the side of the connecting rod 711 away from the stator 11, and the connecting groove 7112 communicates with the groove 7111. A locking hole 1131 is provided on the side of the protrusion 113 away from the stator 11, and the locking hole 1131 communicates with the connecting groove 7112. A receiving groove 115 is provided at the bottom of the locking hole 1131, and a first connecting channel 116 is provided on the side of the receiving groove 115 away from the locking hole 1131, and the first connecting channel 116 communicates with the first airbag 73. The number of connecting bolts 72, sliding plates 74, and first reset pieces 75 is the same as the number of locking holes 1131 and corresponds one-to-one. The connecting bolts 72 pass through the connecting groove 7112 and are threaded into the locking holes 1131, with the head of the connecting bolts 72 pressing against the side of the connecting rod 711 away from the stator 11. The sliding plate 74 is slidably embedded in the receiving groove 115. The sliding direction of the sliding plate 74 is parallel to the axial direction of the locking hole 1131. The side wall of the sliding plate 74 is in contact with the groove wall of the receiving groove 115. The side surface of the sliding plate 74 away from the bottom of the receiving groove 115 is used for the connecting bolt 72 to be tightened. The first reset member 75 is connected between the sliding plate 74 and the stator 11. The first reset member 75 causes the sliding plate 74 to tend to move away from the first connecting channel 116. In this embodiment, the first reset member 75 is a spring. One end of the first reset member 75 is connected to the side surface of the sliding plate 74 near the first connecting channel 116, and the other end of the first reset member 75 is connected to the side wall of the receiving groove 115 near the first connecting channel 116.

[0048] Reference Figure 6The dustproof assembly 7 also includes a second airbag 76, an abutment ring 77, and a second reset member 78. The end of the sleeve 71 furthest from the connecting rod 711 is used to abut against the motor housing. A second annular groove 712 is provided on the inner wall of the sleeve 71, and the second airbag 76 is embedded in the second annular groove 712, with its inner wall pressing against the motor housing. A third annular groove 713 is coaxially provided on the end of the sleeve 71 furthest from the connecting rod 711. A second connecting channel 714 is provided at the bottom of the third annular groove 713, communicating with the second airbag 76. There are twelve second connecting channels 714, evenly distributed circumferentially around the axis of the sleeve 71. The abutment ring 77 is coaxially slidably embedded in the third annular groove 713, with its sidewall fitting against the wall of the third annular groove 713. The second reset member 78 is connected between the abutment ring 77 and the sleeve 71, causing the abutment ring 77 to tend to move away from the connecting rod 711. In this embodiment, the second reset member 78 is a spring. One end of the second reset member 78 is connected to the end of the abutment ring 77 near the bottom of the third annular groove 713, and the other end of the second reset member 78 is connected to the bottom of the third annular groove 713. A plurality of second reset members 78 are provided, and the plurality of second reset members 78 are evenly distributed circumferentially around the axis of the sleeve 71. In this embodiment, twelve second reset members 78 are provided.

[0049] Reference Figure 1 and Figure 4 An electromagnetic brake also includes a braking assembly 3, which comprises a brake disc 31, friction pads 32, and a connecting sleeve 33. The brake disc 31 is coaxially rotatably connected to the armature 2 on the side away from the stator 11. The outer circumference of the brake disc 31 is provided with two fourth annular grooves 312, symmetrically distributed along the rotation axis of the brake disc 31. The number of friction pads 32 is the same as the number of fourth annular grooves 312 and corresponds one-to-one. The friction pads 32 are embedded in the fourth annular grooves 312 and abut against the motor housing and the armature 2. An internal spline 311 is coaxially provided on the inner wall of the brake disc 31, and an external spline 331 is coaxially provided on the outer circumference of the connecting sleeve 33. The internal spline 311 and the external spline 331 cooperate. A keyway 332 is provided on the inner wall of the connecting sleeve 33, and the connecting sleeve 33 is circumferentially fixedly connected to the motor shaft through the keyway 332.

[0050] The implementation principle of an electromagnetic brake according to an embodiment of this application is as follows: the adjusting bolt 4 is threaded into the fixing hole 111 after passing through the connecting hole 21. When the locking member is embedded in the fixing hole 111, the locking member 5 abuts against the wall of the fixing hole 111, increasing the friction between the adjusting bolt 4 and the wall of the fixing hole 111, thereby achieving relative fixation between the adjusting bolt 4 and the stator 11 and reducing the possibility of the adjusting bolt 4 rotating during transportation.

[0051] The connecting bushing 33 is connected to the motor shaft via the keyway 332. The adjusting part 41 of the adjusting bolt 4 abuts against the motor housing. The fixing bolt 6 passes through the mounting hole 112 and the through hole 44 and is threadedly connected to the motor housing, thereby achieving a fixed connection between the stator 11 and the motor housing.

[0052] Sleeve 71 slides along the axis of stator 11, causing abutment ring 77 to abut against the motor housing. Abutment ring 77 then slides against the elastic force of second reset member 78, forcing gas in the third annular groove 713 into the second airbag 76, causing the inner wall of the second airbag 76 to abut against the motor housing. Connecting bolt 72 passes through connecting groove 7112 and is threaded into locking hole 1131. The head of connecting bolt 72 abuts against connecting rod 711, achieving a fixed connection between sleeve 71 and stator 11. Connecting bolt 72 abuts against sliding plate 74, pushing sliding plate 74 against the elastic force of first reset member 75, forcing gas in the receiving cavity into the first airbag 73 through first connecting channel 116, pressing against the inner wall of sleeve 71.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electromagnetic brake, characterized in that: The system includes a brake disc (31), an armature (2), a magnetic yoke (1), and an adjusting bolt (4); the brake disc (31) is rotatably connected to the magnetic yoke (1); the brake disc (31) is coaxially connected to the motor shaft; the armature (2) is slidably connected between the magnetic yoke (1) and the brake disc (31); the sliding direction of the armature (2) is parallel to the rotation axis of the brake disc (31); the adjusting bolt (4) includes an adjusting part (41), a sliding part (42), and a threaded part (43); the sliding part... One end of part (42) is connected to adjustment part (41); one end of threaded part (43) is connected to the other end of sliding part (42); armature (2) is provided with connecting hole (21); sliding part (42) is embedded in connecting hole (21); magnetic yoke (1) is provided with fixing hole (111); threaded part (43) is threadedly connected to fixing hole (111); locking member (5) is connected to the outer periphery of threaded part (43); locking member (5) abuts against the wall of fixing hole (111).

2. The electromagnetic brake according to claim 1, characterized in that: It also includes a fixing bolt (6); the magnetic yoke (1) is provided with a mounting hole (112); the mounting hole (112) is connected to the fixing hole (111); the adjusting bolt (4) is provided with a through hole (44); the fixing bolt (6) passes through the mounting hole (112) and the through hole (44) in sequence and is then threadedly connected to the motor housing.

3. The electromagnetic brake according to claim 1, characterized in that: It also includes friction pads (32); the friction pads (32) are connected to one side of the brake disc (31) along the rotation axis of the brake disc (31); there are two friction pads (32); the two friction pads (32) are symmetrically distributed along the rotation axis of the brake disc (31).

4. The electromagnetic brake according to claim 1, characterized in that: It also includes a connecting bushing (33); an internal spline (311) is coaxially provided on the inner wall of the brake disc (31); an external spline (331) is provided on the outer periphery of the connecting bushing (33); the internal spline (311) and the external spline (331) cooperate with each other; a keyway (332) is provided on the inner wall of the connecting bushing (33); the connecting bushing (33) is fixedly connected to the motor shaft in the circumferential direction through the keyway (332).

5. The electromagnetic brake according to claim 1, characterized in that: It also includes a sleeve (71); the sleeve (71) is coaxially connected to the outer periphery of the magnetic yoke (1); the inner wall of the sleeve (71) is in contact with the outer wall of the magnetic yoke (1); the end of the sleeve (71) away from the magnetic yoke (1) is used to abut against the motor housing.

6. The electromagnetic brake according to claim 5, characterized in that: It also includes a connecting bolt (72); the sleeve (71) is slidably connected to the outer periphery of the magnetic yoke (1); the other end of the sleeve (71) is connected to a connecting rod (711); a protrusion (113) is connected to the outer periphery of the magnetic yoke (1); the connecting rod (711) is provided with a groove (7111) on the side near the magnetic yoke (1); the protrusion (113) is slidably embedded in the groove (7111); the sliding direction of the protrusion (113) is parallel to the axial direction of the sleeve (71); a connecting groove (7112) is provided at the groove wall of the groove (7111); the protrusion (113) is provided with a locking hole (1131); the locking hole (1131) is connected to the connecting groove (7112); the connecting bolt (72) passes through the connecting groove (7112) and is threadedly connected to the locking hole (1131) to realize the relative fixation of the sleeve (71) and the magnetic yoke (1).

7. The electromagnetic brake according to claim 6, characterized in that: It also includes a first airbag (73), a sliding plate (74), and a first reset member (75); the magnetic yoke (1) has a first annular groove (114) on its outer periphery; the first airbag (73) is embedded in the first annular groove (114); the outer wall of the first airbag (73) abuts against the inner wall of the sleeve (71); the bottom of the locking hole (1131) has a receiving groove (115); the receiving groove (115) has a first connecting channel (116) on the side of the groove wall away from the locking hole (1131); the first connecting channel (116) The slide plate (74) is connected to the first airbag (73); the slide plate (74) is slidably embedded in the receiving groove (115); the sliding direction of the slide plate (74) is parallel to the axial direction of the locking hole (1131); the side surface of the slide plate (74) away from the bottom of the receiving groove (115) is used for the connecting bolt (72) to abut; the first reset member (75) is connected between the slide plate (74) and the magnetic yoke (1); the first reset member (75) makes the slide plate (74) tend to move away from the first connecting channel (116).

8. The electromagnetic brake according to claim 5, characterized in that: It also includes a second airbag (76), an abutment ring (77), and a second reset member (78); the inner wall of the sleeve (71) is provided with a second annular groove (712); the second airbag (76) is embedded in the second annular groove (712); the inner wall of the second airbag (76) abuts against the motor housing; the end of the sleeve (71) away from the magnetic yoke (1) is coaxially provided with a third annular groove (713); the third annular groove (713) is connected to the second airbag (76); the abutment ring (77) is coaxially slidably embedded in the third annular groove (713); the second reset member (78) is connected between the sleeve (71) and the abutment ring (77); the second reset member (78) makes the abutment ring (77) tend to move away from the magnetic yoke (1).

Images