Electromagnetic brake

Abstract

The utility model discloses an electromagnetic brake, including casing, coil assembly, friction disc, brake disc and spring, coil assembly fixedly set up in the casing, friction disc is slidably arranged in the casing, and friction disc is rotationally matched with casing, brake disc rotatably set up in the casing, spring bears friction disc, make friction disc always have the movement tendency with brake disc contact, the casing is connected with brake disc and is sleeved and is limited bearing, and limited bearing has first end and second end, the casing has first baffle, and brake disc has second baffle, and at least one of casing and brake disc is provided with limiting piece, along the axial direction of casing, first baffle and second baffle all are limited cooperation with first end, and limiting piece is limited cooperation with second end. The utility model can effectively prevent brake disc axial movement and radial swing.

Description

Technical Field

[0001] This utility model relates to the field of brake technology, and in particular to an electromagnetic brake. Background Technology

[0002] Electromagnetic brakes (also known as electromagnetic actuators) are commonly used braking components in electric motors. Their structure typically includes a housing containing a coil assembly, a spring, a friction disc, and a brake disc, with the brake disc connected to the motor shaft. When the coil assembly is de-energized, the spring pushes the friction disc into contact with the brake disc, using the friction between them to brake the motor shaft. When the coil assembly is energized, the resulting electromagnetic attraction overcomes the spring force, driving the friction disc towards the coil assembly, separating it from the brake disc, thus releasing the brake.

[0003] In some existing technologies, the lack of effective limiting for the brake disc makes it prone to axial movement and radial wobble relative to the housing under the action of the motor shaft. This can cause abnormal noise when the electromagnetic brake is working, and in severe cases, may even lead to brake failure. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings and deficiencies of the existing technology by providing an electromagnetic brake that can effectively prevent axial movement and radial wobble of the brake disc.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] An electromagnetic brake includes a housing, a coil assembly, a friction disc, a brake disc, and a spring. The coil assembly is fixedly disposed within the housing. The friction disc is slidably disposed within the housing and is anti-rotatingly engaged with the housing. The brake disc is rotatably disposed within the housing. The spring abuts against the friction disc, ensuring that the friction disc always has a tendency to contact the brake disc. A limiting bearing is sleeved between the housing and the brake disc. The limiting bearing has a first end and a second end. The housing has a first baffle, and the brake disc has a second baffle. At least one of the housing and the brake disc is provided with a limiting element. Along the axial direction of the housing, both the first baffle and the second baffle are limited to the first end, and the limiting element is limited to the second end.

[0007] Furthermore, the limiting member includes a first limiting member disposed on the housing, the first limiting member being fixedly connected to the housing, and the first limiting member engaging with the second end along the axial direction of the housing.

[0008] Furthermore, the first limiting member is a limiting pressure plate arranged in a ring shape, the housing is provided with a plurality of fixing holes along the circumferential direction, and the first limiting member is provided with a plurality of connecting holes that correspond one-to-one with the fixing holes along the circumferential direction.

[0009] Furthermore, the limiting member includes a second limiting member disposed on the brake disc, the second limiting member being fixedly connected to the brake disc, and along the axial direction of the housing, the second limiting member being in limiting engagement with the second end.

[0010] Furthermore, the second limiting member is a retaining ring, and the brake disc is provided with a retaining groove that is adapted to the retaining ring.

[0011] Furthermore, the brake disc includes a main body and a transmission part, the main body and the transmission part are arranged concentrically and coaxially, the main body is brakely engaged with the friction disc, the limiting bearing is sleeved on the outer peripheral side of the transmission part, and the second baffle is disposed on the outer peripheral wall of the transmission part.

[0012] Furthermore, a soft rubber sleeve is provided at the end of the transmission part away from the main body.

[0013] Furthermore, the outer peripheral wall of the friction disc is provided with a plurality of lugs along the circumferential direction, and the housing is provided with a plurality of sliding grooves corresponding one-to-one with the lugs, and the lugs slide and engage with the sliding grooves.

[0014] Furthermore, the brake disc is fixedly connected to a rotating shaft, which is coaxially arranged with the brake disc. The rotating shaft is movably inserted through the coil assembly, and a signal ring is provided at the end of the rotating shaft away from the brake disc.

[0015] Furthermore, the limiting bearing is a ball bearing.

[0016] The beneficial effects of this utility model are as follows: The electromagnetic brake provided by this utility model, by fitting a limiting bearing between the brake disc and the housing, wherein the housing has a first baffle and the brake disc has a second baffle, and at least one of the housing and the brake disc is provided with a limiting member, the first baffle and the second baffle are both limited to the first end of the limiting bearing along the axial direction of the housing, and the limiting member is limited to the second end of the limiting bearing, thereby achieving dual limiting of the brake disc in the axial and radial directions of the housing, thus effectively preventing axial movement and radial sway of the brake disc, and improving the stability, reliability and quietness of the electromagnetic brake during operation. Attached Figure Description

[0017] Figure 1 This is an overall perspective view of the first electromagnetic brake provided in the embodiment.

[0018] Figure 2This is an overall cross-sectional view of the first electromagnetic brake provided in the embodiment.

[0019] Figure 3 This is an exploded view of the first electromagnetic brake provided in the embodiment.

[0020] Figure 4 This is an overall cross-sectional view of the second electromagnetic brake provided in the embodiment.

[0021] Figure 5 This is an exploded view of the second type of electromagnetic brake provided in the embodiment.

[0022] Figures 1 to 5 Components: 1. Housing; 11. Slide groove; 12. First baffle; 13. Fixing hole; 2. Coil assembly; 21. Iron core; 211. Clearance hole; 22. Coil bracket; 23. Coil body; 3. Friction disc; 31. Lug; 32. Friction surface; 4. Brake disc; 41. Main body; 411. Braking surface; 42. Transmission part; 421. Second baffle; 422. Slot; 423. Transmission groove; 424. Transmission section; 5. Spring; 6. Limit bearing; 61. First end; 62. Second end; 7. Limiting member; 71. First limiting member; 711. Connecting hole; 72. Second limiting member; 8. Coupling; 9. Soft rubber sleeve; 10. Rotating shaft; 101. Signal ring. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] like Figures 1 to 5 An electromagnetic brake, as shown, includes a housing 1, a coil assembly 2, a friction disc 3, a brake disc 4, and a spring 5. The coil assembly 2, friction disc 3, and brake disc 4 are arranged sequentially within the housing 1 along its axial direction. The coil assembly 2 is fixedly disposed within the housing 1 and includes an iron core 21, a coil support 22, and a coil body 23. The coil support 22 is sleeved on the iron core 21, and the coil body 23 is wound around the outside of the coil support 22. The friction disc 3 is slidably disposed within the housing 1, and the friction disc 3 is anti-rotationally engaged with the housing 1. That is, the friction disc 3 can slide within the housing 1 along its axial direction, but it cannot rotate relative to the housing 1 along its circumference.

[0025] See Figure 3 and Figure 5As shown, the outer peripheral wall of the friction disk 3 is provided with a plurality of lugs 31 along the circumferential direction, and the housing 1 is provided with a plurality of sliding grooves 11 corresponding to the lugs 31 one by one. The lugs 31 and the sliding grooves 11 slide and cooperate. Through the sliding cooperation between the lugs 31 and the sliding grooves 11, it can effectively ensure that the friction disk 3 can move linearly along the axial direction of the housing 1, and at the same time, it can limit the friction disk 3 in the circumferential direction, so that the friction disk 3 and the housing 1 form an anti-rotation cooperation in the circumferential direction.

[0026] The brake disc 4 is rotatably mounted inside the housing 1. The brake disc 4 is directly or indirectly connected to the motor shaft of the motor. When the motor is working, the brake disc 4 rotates synchronously with the motor shaft. The spring 5 holds the friction disc 3, so that the friction disc 3 always has a tendency to contact the brake disc 4.

[0027] See Figures 2 to 5 As shown, the friction disc 3 has a friction surface 32, and the brake disc 4 has a brake surface 411. When the coil assembly 2 is de-energized, under the elastic force of the spring 5, the friction surface 32 of the friction disc 3 contacts the brake surface 411 of the brake disc 4. Under the frictional force of the two, the friction disc 3 brakes the brake disc 4, preventing the motor shaft from rotating. When the coil assembly 2 is energized, the coil assembly 2 generates an electromagnetic attraction force. This electromagnetic attraction force drives the friction disc 3 to overcome the elastic force of the spring 5 and move the friction disc 3 towards the coil assembly 2. At this time, the friction surface 32 of the friction disc 3 separates from the brake surface 411 of the brake disc 4, and the brake disc 4 releases its braking force, allowing the motor shaft to rotate normally.

[0028] Since the brake disc 4 is connected to the motor shaft, axial movement or low concentricity of the motor shaft can cause axial movement or radial wobble of the brake disc 4 relative to the housing 1. When the coil assembly 2 is energized (the electromagnetic brake is usually energized and de-energized synchronously with the motor), the brake disc 4 rotates synchronously with the motor shaft. If the brake disc 4's movement / wobble causes undesirable contact between the brake surface 411 and the friction surface 32 of the friction disc 3, the electromagnetic brake will produce abnormal noise. If the movement / wobble increases the set gap between the brake surface 411 and the friction surface 32 of the friction disc 3, the friction disc 3 may be unable to brake the brake disc 4 when the coil assembly 2 is de-energized, resulting in brake failure.

[0029] In view of this, the present invention provides an electromagnetic brake in which a limiting bearing 6 is sleeved between the housing 1 and the brake disc 4. The limiting bearing 6 is a ball bearing and has a first end 61 and a second end 62. The housing 1 has a first baffle 12, and the brake disc 4 has a second baffle 421. At least one of the housing 1 and the brake disc 4 is provided with a limiting element 7. Along the axial direction of the housing 1, both the first baffle 12 and the second baffle 421 are limited and engaged with the first end 61, and the limiting element 7 is limited and engaged with the second end 62. Through the above structural design, the brake disc 4 is dually limited in both the axial and radial directions within the housing 1, thereby effectively preventing axial movement and radial wobble of the brake disc 4, and improving the stability, reliability, and quietness of the electromagnetic brake during operation. Through the above structural design, the electromagnetic brake can be pre-assembled into a component, and then the pre-assembled electromagnetic brake can be assembled into a motor, which is beneficial to improving installation efficiency and assembly accuracy.

[0030] To improve the stability of the limiting position, both the housing 1 and the brake disc 4 are provided with limiting components 7. Specifically, the limiting components 7 include a first limiting component 71 disposed on the housing 1 and a second limiting component 72 disposed on the brake disc 4. The first limiting component 71 is fixedly connected to the housing 1, and the second limiting component 72 is fixedly connected to the brake disc 4. Along the axial direction of the housing 1, both the first limiting component 71 and the second limiting component 72 are engaged with the second end 62 for limiting. The first limiting component 71 and the first baffle 421 cooperate to axially limit the outer ring of the limiting bearing 6, while the second limiting component 72 and the second baffle 421 axially limit the inner ring of the limiting bearing 6.

[0031] Of course, in other embodiments, the limiting member 7 may be provided only in the housing 1 (i.e., only the first limiting member 71 is provided), or the limiting member 7 may be provided only in the brake disc 4 (i.e., only the second limiting member 72 is provided), which will not be elaborated here.

[0032] Preferably, the first limiting member 71 is a ring-shaped limiting pressure plate. The housing 1 has a plurality of fixing holes 13 along the circumferential direction, and the first limiting member 71 has a plurality of connecting holes 711 corresponding one-to-one with the fixing holes 13 along the circumferential direction. The second limiting member 72 is a retaining ring, and the brake disc 4 has a retaining groove 422 adapted to the retaining ring. The inner wall of the fixing hole 13 is threaded. When the limiting bearing 6 is assembled between the housing 1 and the brake disc 4, a fastener (such as a screw) is inserted into the connecting hole 711, so that the fastener and the thread in the fixing hole 13 are engaged and connected, so that the first limiting member 71 is fixed to the housing 1. Correspondingly, the retaining ring is inserted into the retaining groove 422, thereby completing the limiting installation of the limiting bearing 6 and the brake disc 4.

[0033] The brake disc 4 includes a main body 41 and a transmission part 42, which are arranged concentrically and coaxially. The brake surface 411 of the brake disc 4 is provided on the end face of the main body 41 near the brake disc 4. The main body 41 is braked and engaged with the friction disc 3. The limiting bearing 6 is sleeved on the outer peripheral side of the transmission part 42. The second baffle 421 and the slot 422 are provided on the outer peripheral wall of the transmission part 42.

[0034] Preferably, the transmission unit 42 is connected to the motor shaft via a coupling 8, see [link to relevant documentation]. Figure 4 and Figure 5 As shown, in one embodiment, a transmission groove 423 is provided at the end of the transmission part 42 away from the main body part 41. One end of the coupling 8 is inserted into the transmission groove 423, and the other end of the coupling 8 is connected to the motor shaft, thereby realizing the transmission connection between the motor shaft and the brake disc 4. See also Figure 2 and Figure 3 As shown, in another embodiment, a transmission section 424 may also be provided at the end of the transmission part 42 away from the main body part 41, so that one end of the coupling 8 is sleeved on the outside of the transmission section 424, and the other end of the coupling 8 is connected to the motor shaft, thereby realizing the transmission connection between the motor shaft and the brake disc 4.

[0035] Preferably, a soft rubber sleeve 9 is provided at the end of the transmission part 42 that is away from the main body part 41. See also Figure 4 and Figure 5 As shown, in one embodiment, a soft rubber sleeve 9 is disposed within the transmission groove 423, such that the soft rubber sleeve 9 is fitted between the coupling 8 and the transmission groove 423. See also Figure 2 and Figure 3 As shown, in another embodiment, a soft rubber sleeve 9 is fitted onto the outside of the transmission section 424, so that the soft rubber sleeve 9 is fitted between the coupling 8 and the transmission section 424. By setting the soft rubber sleeve 9, the flexible damping effect of the soft rubber sleeve 9 is used to prevent rigid hard contact between the transmission section 42 and the coupling 8, thereby further avoiding the phenomenon of brake disc 4 shaking, abnormal noise and wear caused by misalignment between brake disc 4 and motor shaft.

[0036] See Figure 4 and Figure 5 As shown, a rotating shaft 10 is fixedly connected to the brake disc 4. The rotating shaft 10 and the brake disc 4 are arranged concentrically and coaxially. The center of the iron core 21 has a clearance hole 211 for the rotating shaft 10 to pass through. The rotating shaft 10 is movably inserted into the coil assembly 2 through the clearance hole 211. A signal ring 101 is provided at the end of the rotating shaft 10 away from the brake disc 4. By setting the rotating shaft 10 on the brake disc 4 and setting the signal ring 101 on the rotating shaft 10, the working state of the brake disc 4 (such as the rotation speed) can be detected in real time, thereby realizing the real-time detection of the motor's working state.

[0037] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. An electromagnetic brake, comprising a housing, a coil assembly, a friction disc, a brake disc, and a spring, wherein the coil assembly is fixedly disposed within the housing, the friction disc is slidably disposed within the housing and is anti-rotatingly engaged with the housing, the brake disc is rotatably disposed within the housing, and the spring abuts against the friction disc, thereby ensuring that the friction disc always has a tendency to contact the brake disc, characterized in that: A limiting bearing is sleeved between the housing and the brake disc. The limiting bearing has a first end and a second end. The housing has a first baffle wall, and the brake disc has a second baffle wall. At least one of the housing and the brake disc is provided with a limiting element. Along the axial direction of the housing, both the first baffle wall and the second baffle wall are limited to the first end, and the limiting element is limited to the second end.

2. An electromagnetic brake according to claim 1, characterized in that: The limiting member includes a first limiting member disposed on the housing, the first limiting member being fixedly connected to the housing, and along the axial direction of the housing, the first limiting member engaging with the second end.

3. An electromagnetic brake according to claim 2, characterized in that: The first limiting member is a limiting pressure plate arranged in a ring shape. The housing is provided with a plurality of fixing holes along the circumferential direction. The first limiting member is provided with a plurality of connecting holes along the circumferential direction that correspond one-to-one with the fixing holes.

4. An electromagnetic brake according to any one of claims 1 to 3, characterized in that: The limiting member includes a second limiting member disposed on the brake disc, the second limiting member being fixedly connected to the brake disc, and along the axial direction of the housing, the second limiting member being in limiting engagement with the second end.

5. An electromagnetic brake according to claim 4, characterized in that: The second limiting member is a retaining ring, and the brake disc is provided with a retaining groove that is adapted to the retaining ring.

6. An electromagnetic brake according to claim 1, characterized in that: The brake disc includes a main body and a transmission part, which are arranged concentrically and coaxially. The main body is braked in conjunction with the friction disc. The limiting bearing is sleeved on the outer peripheral side of the transmission part, and the second baffle is disposed on the outer peripheral wall of the transmission part.

7. An electromagnetic brake according to claim 6, characterized in that: A soft rubber sleeve is provided at the end of the transmission part away from the main body.

8. An electromagnetic brake according to claim 1, characterized in that: The outer peripheral wall of the friction disc is provided with a plurality of lugs along the circumferential direction, and the housing is provided with a plurality of sliding grooves corresponding one-to-one with the lugs, and the lugs slide and engage with the sliding grooves.

9. An electromagnetic brake according to claim 1, characterized in that: The brake disc is fixedly connected to a rotating shaft, which is coaxial with the brake disc. The rotating shaft is movably inserted through the coil assembly, and a signal ring is provided at the end of the rotating shaft away from the brake disc.

10. An electromagnetic brake according to claim 1, characterized in that: The limiting bearing is a ball bearing.

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