Electromagnetic brake

Abstract

An electromagnetic brake comprises a housing (10), a friction element (20) and a movable assembly (30) arranged in the housing (10), and a handle (40) arranged outside the housing (10) and connected with the movable assembly (30), one of the handle (40) and the housing (10) is provided with a convex part (46), and the other is provided with a first acting surface (12) and a second acting surface (14), the first acting surface (12) and the second acting surface (14) have a height difference in the axial direction; the handle (40) can rotate relative to the housing (10) between a first position and a second position, when the handle (40) is in the first position, the convex part (46) is opposite to the first acting surface (12), and the movable assembly (30) abuts against the friction element (20); when the handle (40) rotates to the second position, the convex part (46) is opposite to the second acting surface (14), and the movable assembly (30) is separated from the friction element (20) along the axial direction relative to the housing (10).

Description

Technical Field

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

[0002] In existing electromagnetic brake structures, the state is switched by whether the excitation coil is energized or not. For example, when the excitation coil is not energized, the armature is in contact with the friction disc, and the brake is in a braking state; when it is necessary to release the brake, the excitation coil is energized and generates a corresponding magnetic field, driving the armature to separate from the friction disc. However, in some special cases, such as when the power supply fails and cannot supply power to the coil, the brake cannot be released, which requires further improvement. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide an electromagnetic brake that can be manually released under special circumstances such as power failure.

[0004] This application provides an electromagnetic brake, including a housing, a friction element and a movable component disposed within the housing, and a handle disposed outside the housing and connected to the movable component. One of the handle and the housing is provided with a protrusion, and the other is provided with a first working surface and a second working surface, the first working surface and the second working surface having a height difference in the axial direction. The handle is rotatable relative to the housing between a first position and a second position. When the handle is in the first position, the protrusion faces the first working surface, and the movable component abuts against the friction element. When the handle is rotated to the second position, the protrusion faces the second working surface, and the movable component separates from the friction element in the axial direction relative to the housing.

[0005] Compared to existing technologies, the electromagnetic brake provided in this application uses the cooperation between the handle and the housing. When the handle is rotated, it generates axial movement, which drives the moving component to move axially and separate from the friction component, thereby realizing the manual release of the brake. This addresses special situations such as power failure and is convenient for users. Overall, the structure is simple and easy to use. Attached Figure Description

[0006] Figure 1 This is an assembly diagram of an embodiment of the electromagnetic brake of this application, wherein the electromagnetic brake is in a braking state.

[0007] Figure 2 for Figure 1 The exploded view of the electromagnetic brake shown.

[0008] Figure 3 for Figure 2 Another angle view of the handle.

[0009] Figure 4 for Figure 2 Enlarged view of center circle IV.

[0010] Figure 5 for Figure 1 The top view of the electromagnetic brake shown.

[0011] Figure 6 for Figure 5 A sectional view along line VI-VI.

[0012] Figure 7 for Figure 1 The diagram shows a manual release of the electromagnetic brake.

[0013] Figure 8 for Figure 7 A cross-sectional view along line VIII-VIII. Detailed Implementation

[0014] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. One or more embodiments of this application are exemplarily shown in the drawings to provide a more accurate and thorough understanding of the technical solutions disclosed herein. However, it should be understood that this application can be implemented in many different forms and is not limited to the embodiments described below.

[0015] This application provides an electromagnetic brake that can be applied to the braking system of mechanical equipment such as lawnmowers. Figure 1-2 The present invention illustrates a specific embodiment of an electromagnetic brake, which includes a housing 10, a friction element 20 and a movable component 30 disposed in the housing, and a handle 40 that is pulsatorically connected to the movable component 30.

[0016] The housing 10 has a generally flat, cylindrical structure, with an internal space for mounting the friction element 20 and the movable component 30. A handle 40 is located on the outside of the housing 10 and can rotate relative to the housing 10 between a first position and a second position. Typically, the first and second positions are marked on the housing 10 to help the user identify the position of the handle 40. In the illustration, the first position is marked "Normal," and the second position is marked "Release." When the handle 40 rotates relative to the housing 10, it drives the movable component 30 to move axially relative to the housing 10 between a braking position and a release position, switching the state of the brake.

[0017] like Figure 5-6 As shown, when the handle 40 is in the first position, the movable component 30 is in the braking position, axially abutting against the friction member 20, thus preventing the friction member 20 from moving, and the electromagnetic brake applies the brakes. Figure 7-8 As shown, when the handle 40 is in the second position, the movable component 30 is in the released position and is axially separated from the friction member 20, no longer restricting the movement of the friction member 20, and the electromagnetic brake is released.

[0018] like Figure 2 and Figure 3 As shown, one end of the handle 40 forms a connecting portion 42, and the other end forms an operating portion 44. The connecting portion 42 is generally circular, stacked on the center of the outer side of the housing 10, and connected to the movable component 30. A protrusion 46 is provided on the side of the connecting portion 42 facing the housing 10, and the protrusion 46 is preferably integral with the connecting portion 42. A first working surface 12 and a second working surface 14 are provided on the outer side of the housing 10 (i.e., the side facing the handle 40). Both the first working surface 12 and the second working surface 14 are located on the rotation path of the protrusion 46, wherein the second working surface 14 protrudes outward in the axial direction relative to the first working surface 12, and the two form a certain axial height difference.

[0019] like Figure 5 As shown, when the handle 40 is in the first position, the protrusion 46 is directly opposite the first working surface 12; as Figure 7 As shown, when the handle 40 is rotated to the second position, the protrusion 46 faces the second working surface 14. Due to the height difference between the first working surface 12 and the second working surface 14 in the axial direction, the handle 40 rotates relative to the housing 10 while moving axially relative to the housing 10, thereby driving the movable component 30 to move axially from the braking position to the release position.

[0020] In this embodiment, the protrusion 46 is a block structure that extends integrally downward from the outer edge of the connecting portion 42 of the handle 40, and preferably there are multiple protrusions 46. In the figure, there are three protrusions 46, which are evenly spaced along the circumference of the connecting portion 42. In some embodiments, the protrusions 46 can also be formed separately and then assembled onto the connecting portion 42.

[0021] In this embodiment, a flange 11 protrudes from the outer surface of the housing 10. The outer end face of the flange 11 is recessed to form a groove, and the bottom of the groove constitutes a first working surface 12. The portion of the outer end face of the flange 11 outside the groove constitutes a second working surface 14. The number of first working surfaces 12 and second working surfaces 14 corresponds to the number of protrusions 46, preferably multiple of each, and they are alternately arranged in the circumferential direction. Preferably, an inclined guide surface 13 is formed between adjacent first working surfaces 12 and second working surfaces 14, allowing the protrusions 46 to slide smoothly between the first working surfaces 12 and second working surfaces 14.

[0022] like Figure 5-6 As shown, when the electromagnetic brake is in the braking state, the handle 40 is in the first position. At this time, the protrusion 46 of the handle 40 faces the first working surface 12, and the protrusion 46 extends into the groove so that the connecting part 42 of the handle 40 can be close to the flange 11. The movable component 30 is in the braking position and abuts against the friction member 20, so that the friction member 20 and the connected equipment (such as motor) cannot operate, thus achieving the braking effect.

[0023] like Figure 7-8 As shown, when the electromagnetic brake is released, the handle 40 rotates to the second position. At this time, the protrusion 46 slides out of the groove and faces the second working surface 14, causing the connecting part 42 of the handle 40 to be pushed outward relative to the flange 11 of the housing 10, driving the movable component 30 to move axially away from the friction member 20. In this way, the movable component 30 moves to the release position and separates from the friction member 20, allowing the friction member 20 and the connected equipment to operate normally.

[0024] The electromagnetic brake of the above embodiments of this application, through the cooperation of the protrusion 46 of its handle 40 with two working surfaces 12 and 14 on the housing 10 with different axial heights, allows the handle 40 to rotate circumferentially and move axially, thereby driving the movable component 30 to move axially and release the braking state. This can effectively cope with special situations such as power failure and facilitate user use. In some embodiments, the protrusion 46 can also be disposed on the outer surface of the housing 10, and the first working surface 12 and the second working surface 14 can be disposed on the side of the handle 40 facing the housing 10. As long as the handle 40 rotates relative to the housing 10, the protrusion 46 can slide between the first working surface 12 and the second working surface 14 with different axial heights to achieve axial movement of the handle 40, thereby driving the movable component 30 to move axially and release the braking of the electromagnetic brake.

[0025] In some embodiments, a limiting structure 16 protrudes from the outer edge of the housing 10. The limiting structure 16 includes a first stop 161 and a second stop 163 spaced apart in the circumferential direction. The operating part 44 of the handle 40 rotates between the first stop 161 and the second stop 163. When the operating part 44 rotates to abut against the first stop 161, it reaches a first position (e.g., ...). Figure 5 (As shown); when the operating part 44 rotates to abut against the second stop 163 (as shown) Figure 7 As shown), it reaches the second position. Preferably, the end of the operating part 44 of the handle 40 extends outward in the radial direction relative to the housing 10 by a certain length, which facilitates the user to operate it directly or through other parts. By providing a limiting structure 16 on the housing 10, the stroke of the handle 40 is limited, saving operating space, and the user does not need to consider the rotation angle during operation, further facilitating the user's operation.

[0026] In some embodiments, the edge of the housing 10 is further provided with a positioning protrusion 18, and the operating part 44 of the handle 40 is correspondingly provided with a positioning hole 48. The positioning protrusion 18 is located near the first stop 161. When the handle 40 is rotated to the first position, the positioning protrusion 18 engages with the positioning hole 48 to lock the handle 40 in the braking position, preventing the handle 40 from being accidentally released due to vibration or other reasons. Preferably, the positioning protrusion 18 has a hemispherical structure, which can smoothly engage with or disengage from the positioning hole 48 during the rotation of the handle 40, making the operation of the user more effortless.

[0027] In some embodiments, the housing 10 may be provided with another positioning protrusion near the second stop 163, such that when the handle 40 is rotated to the second position, the positioning protrusion engages with the positioning hole 48 to lock the handle 40 in the release position.

[0028] like Figure 2 and Figure 4 As shown, the first stop 161 has an inverted L-shaped structure, including a first stop 167 and a second stop 165 that are perpendicular to each other. When the handle 40 is in the first position, the first stop 167 is located on the outer circumferential side of the operating part 44, limiting the handle 40 in the circumferential direction to prevent the handle 40 from rotating too much; the second stop 165 is located on the upper side of the operating part 44 in the axial direction, limiting the handle 40 so that the positioning protrusion 18 can be engaged and held in the positioning hole 48.

[0029] In some embodiments, the handle 40 may be as follows: Figure 7 The handle 40 is rotated clockwise from the first position to the second position, as indicated by the middle arrow, to release the brake. In some embodiments, the handle 40 can also be rotated counterclockwise from the first position to the second position, to release the brake. Depending on the specific application scenario of the electromagnetic brake or the user's usage habits, such as corresponding to the left or right wheel of a vehicle, the handle 40 can be set to release the brake by rotating clockwise or counterclockwise. In some embodiments, such as when the left and right wheels of a vehicle are equipped with brakes respectively, two limiting structures 16 can be symmetrically provided on the housing 10, corresponding to the operation of rotating the handle 40 from different sides to release the brake.

[0030] like Figure 2 As shown, the movable component 30 includes a shaft 32, an armature 34, and a connector 36 connecting the shaft 32 and the armature 34. One end of the shaft 32 (e.g., Figure 2 The top end (as shown) extends out of the housing 10 after passing through the central perforation and is inserted into the connection part 42 of the handle 40; the other end (as shown) Figure 2The bottom end (shown) is connected to the armature 34 via the connector 36. When the handle 40 is rotated, the armature 34 is moved axially via the shaft 32, causing it to abut or separate from the friction element 20. Preferably, both the armature 34 and the friction element 20 are thin disc-shaped structures, which can make full contact and generate a sufficiently large frictional force when they abut each other, thus restricting the movement of the friction element 20.

[0031] In some embodiments, a sealing ring 50 is fitted onto the shaft 32. Preferably, an annular flange 19 is provided around the through hole on the outer side of the housing 10, and an annular groove 190 is formed in the annular flange 19 (e.g., Figure 6 As shown, the sealing ring 50 is embedded in the annular groove 19, so that the outer wall surface of the shaft 32 and the outer side surface of the housing 10 form a sealed connection, preventing external moisture, dust, etc. from entering the housing 10 and affecting the use of the electromagnetic brake. Preferably, the flange 11 is arranged around the annular groove 19, and the height of the flange 11 protruding outward relative to the housing 10 is less than the height of the annular groove 19 protruding outward relative to the housing 10, and the connecting part 42 of the handle 40 is supported by the annular groove 19.

[0032] In some embodiments, the outer end of the shaft 32 is engaged with a retaining ring 52, which is stacked on the outer side of the connecting portion 42 of the handle 40 (i.e. the side facing away from the housing 10) to restrict the relative axial movement of the handle 40 and the shaft 32, so that when the handle 40 is lifted, it can drive the shaft 32 to move away from the housing 10.

[0033] In some embodiments, an elastic element 38 is sleeved on the shaft 32. The elastic element 38 is sandwiched between the inner end of the shaft 32 and the inner side of the housing 10 (i.e., the side facing away from the handle 40), and is preferably a coil spring or the like. When the electromagnetic brake is in the braking state, the elastic element 38 is naturally extended or slightly deformed; when the electromagnetic brake is released, the elastic element 38 is compressed and deformed due to the upward movement of the shaft 32; when the electromagnetic brake is applied again, the elastic element 38 recovers its deformation, pushing the shaft 32 downward to reset, and keeping the movable component 30 in a state of abutment against the friction member 20.

[0034] In the illustrated embodiment, the shaft 32 can be constructed as a pin, rivet, or similar structure, with its inner end forming a larger diameter head end 33. A through hole is provided in the center of the connector 36. The shaft 32 passes through the through hole of the connector 36 and the through hole in the center of the housing 10 from bottom to top, and then is inserted into the connecting part 42 of the handle 40. The head end 33 of the connector 36 abuts against the lower edge of the through hole in the connector 36, and the elastic member 38 is clamped between the head end 33 and the housing 10.

[0035] Preferably, a wear-resistant plate 54 is provided between the annular edge 19 of the housing 10 and the connection portion 32 of the handle 30, and a wear-resistant plate 56 is provided between the inner side surface of the housing 10 and the elastic member 38.

[0036] The electromagnetic brake of this application is preferably a de-energized electromagnetic brake, and further includes a stator assembly 60 disposed in the housing 10 and facing the armature 34. The stator assembly 60 includes an excitation coil 62 and a stator shell 64 covering the excitation coil 62. The excitation coil 62 and the friction element 20 are respectively located on both axial sides of the armature 34. When the excitation coil 62 is not energized, it exerts no force on the armature 34, and the armature 34 remains in a state of contact with the friction element 20, that is, the electromagnetic brake is in a braking state. When the excitation coil 62 is energized, it generates a magnetic field that drives the armature 34 to separate from the friction element 20, releasing the braking state. In the braking state, the armature 34 and the stator assembly 60 are axially spaced; after the braking is released, the armature 34 moves toward the stator assembly 60, and the two may be in contact or have a certain gap.

[0037] In some embodiments, the housing 10 of the electromagnetic brake is a cylindrical structure with one open end, and the open end is connected to a cover plate 70 by a fixing member, such as a screw 58. Preferably, a sealing ring 72 is provided between the end face of the cover plate 70 and the open end of the housing 10. Through the cover plate 70, the electromagnetic brake can be connected to other equipment, such as a motor, and the motor shaft can pass through the cover plate 70 and connect to the friction member 20. In the braking state, the friction member 20 is clamped and fixed between the armature 34 of the movable component 30 and the cover plate 70, so that the entire motor cannot rotate; after the brake is released, the friction member 20 is no longer restricted by the armature 34 of the movable component 30, and the motor can operate normally.

[0038] Preferably, a sleeve 74 is provided between the cover plate 70 and the stator housing 64. The sleeve 74 provides axial support for the stator assembly 60, allowing a gap to be reserved between the stator assembly 60 and the armature 34, facilitating the axial movement of the armature 34. Preferably, multiple sleeves 74 are arranged at circumferential intervals. The stator housing 64 and the cover plate 70 are provided with fixing holes at the corresponding sleeve positions. Screws 59, etc., pass through the corresponding fixing holes and sleeves 74 to fix the stator housing 64 and the cover plate 70. Preferably, the outer diameter of the armature 34 is approximately the same as the outer diameter of the stator housing 64. A notch 35 is provided on the outer edge of the armature 34 for the sleeve 74 to pass through. This not only facilitates the assembly of the stator assembly 60 and the cover plate 70, but more importantly, the sleeve 74 can guide the axial movement of the armature 34 to prevent swaying.

[0039] The electromagnetic brake of this application utilizes the cooperation between the handle 40 and the housing 10. As the handle 40 rotates, it moves axially, causing the movable component 30 to move axially and separate from the friction element 20, thus enabling manual release of the brake. This addresses special situations such as power failure and facilitates user operation. Overall, the structure is simple and easy to use.

[0040] It should be noted that the above embodiments only illustrate preferred embodiments of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting this application. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of this application, such as combining different features in various embodiments, and these should all fall within the protection scope of this application.

Claims

1. An electromagnetic brake, comprising a housing, a friction element and a movable component disposed within the housing, and a handle disposed outside the housing and connected to the movable component, characterized in that, One of the handle and the housing is provided with a protrusion, and the other is provided with a first working surface and a second working surface. The first working surface and the second working surface have a height difference in the axial direction, and an inclined guide surface is provided between the first working surface and the second working surface. The handle is rotatable relative to the housing between a first position and a second position. When the handle is in the first position, the protrusion faces the first working surface and the movable component abuts against the friction element. When the handle is rotated to the second position, the protrusion faces the second working surface and the movable component separates from the friction element axially relative to the housing.

2. The electromagnetic brake as described in claim 1, characterized in that, The protrusion is integrally formed by the handle and protrudes toward the housing, and the first working surface is away from the handle relative to the second working surface; When the handle is in the first position, the protrusion abuts against the first working surface; when the handle is rotated to the second position, the protrusion abuts against the second working surface.

3. The electromagnetic brake as described in claim 1, characterized in that, The outer edge of the housing is provided with a positioning protrusion, and the handle is provided with a positioning hole; When the handle is in the first position, the positioning protrusion engages with the positioning hole.

4. The electromagnetic brake as described in claim 3, characterized in that, The outer edge of the housing is provided with a limiting structure, which includes a first stop and a second stop spaced apart in the circumferential direction. The handle rotates between the first stop and the second stop. When the handle is in the first position, it abuts against the first stop; when the handle is in the second position, it abuts against the second stop.

5. The electromagnetic brake as described in claim 4, characterized in that, The first stop is inverted L-shaped, including a first stop portion and a second stop portion that are perpendicular to each other; When the handle is in the first position, the first stop portion limits the handle in the circumferential direction, and the second stop portion limits the handle in the axial direction.

6. The electromagnetic brake as described in claim 2, characterized in that, The housing has a flange on the side facing the handle, the outer end face of the flange is partially concave to form the first working surface, and the remaining part of the outer end face of the flange forms the second working surface.

7. The electromagnetic brake as described in claim 6, characterized in that, The housing has a ring edge at the center of the side facing the handle to support the handle; The flange is disposed around the annular edge, and the height of the flange protruding outward relative to the housing is less than the height of the annular edge protruding outward relative to the housing.

8. The electromagnetic brake as described in any one of claims 1-7, characterized in that, The movable component includes a shaft and an armature connected to one end of the shaft, the other end of the shaft extending out of the housing and connected to the handle; The brake also includes a stator assembly, which includes an excitation coil, and the excitation coil and the friction element are respectively disposed on both sides of the armature along the axial direction.

9. The electromagnetic brake as described in claim 8, characterized in that, A sealing ring is provided between the shaft and the outer side of the housing.

10. The electromagnetic brake as described in claim 8, characterized in that, An elastic element is sleeved on the shaft, with one end of the elastic element abutting against the housing and the other end abutting against the end of the shaft that connects to the armature.

11. The electromagnetic brake as described in claim 8, characterized in that, The housing is a cylindrical structure with one end open. A cover plate is provided at the open end of the housing. A sleeve is provided between the stator assembly and the cover plate. The armature is provided with a notch for the sleeve to pass through.

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