Electromagnetic brake

Abstract

An electromagnetic brake, comprising a housing (10), a friction member (20) and a movable assembly (30) which are arranged in the housing (10), and a lever (40) arranged outside the housing (10) and connected to the movable assembly (30). One of the lever (40) and the housing (10) is provided with a protruding portion (46), and the other one 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 lever (40) can rotate between a first position and a second position relative to the housing (10); when the lever (40) is in the first position, the protruding portion (46) directly faces the first acting surface (12), and the movable assembly (30) abuts against the friction member (20); and when the lever (40) rotates to the second position, the protruding portion (46) directly faces the second acting surface (14), and the movable assembly (30) is separated from the friction member (20) in the axial direction relative to the housing (10).

Description

electromagnetic brake Technical Field

[0001] The present application relates to the technical field of brakes, and in particular to an electromagnetic brake. Background Art

[0002] In existing electromagnetic brake structures, the state of the brake is switched by the power supply to the excitation coil. For example, when the excitation coil is de-energized, the armature contacts the friction disc, and the brake is in the braking state. To release the brake, the excitation coil is energized, generating a corresponding magnetic field, driving the armature and friction disc apart. However, in some special cases, such as when the power supply to the coil is lost, the brake cannot be released, and further improvement is needed.

[0003] Summary of the Invention

[0004] In view of this, the purpose of this application is to provide an electromagnetic brake that can be manually released under special conditions such as power failure.

[0005] The present application provides an electromagnetic brake, comprising a shell, a friction member and a movable component arranged in the shell, and a handle arranged outside the shell and connected to the movable component, wherein one of the handle and the shell is provided with a convex portion, and the other is provided with a first acting surface and a second acting surface, and the first acting surface and the second acting surface have a height difference in the axial direction; the handle can be rotated between a first position and a second position relative to the shell, when the handle is in the first position, the convex portion faces the first acting surface, and the movable component abuts against the friction member; when the handle is rotated to the second position, the convex portion faces the second acting surface, and the movable component is separated from the friction member axially relative to the shell.

[0006] Compared with the existing technology, the electromagnetic brake provided in this application cooperates with the handle and the shell. The handle generates axial movement while rotating, driving the movable component to move axially and separate from the friction part, thereby realizing manual release of the brake, responding to special situations such as power failure, and facilitating user use. The overall structure is simple and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] FIG1 is an assembly diagram of an embodiment of an electromagnetic brake of the present application, wherein the electromagnetic brake is in a braking state.

[0008] FIG2 is an exploded view of the electromagnetic brake shown in FIG1 .

[0009] FIG3 is a view of the handle in FIG2 from another angle.

[0010] FIG4 is an enlarged view of circle IV in FIG2 .

[0011] FIG5 is a top view of the electromagnetic brake shown in FIG1 .

[0012] FIG6 is a cross-sectional view along line VI-VI of FIG5 .

[0013] FIG7 is a schematic diagram of manually releasing the electromagnetic brake shown in FIG1 .

[0014] FIG8 is a cross-sectional view along line VIII-VIII of FIG7 .

[0015] DETAILED DESCRIPTION

[0016] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings provide exemplary embodiments of the present application to provide a more accurate and thorough understanding of the technical solutions disclosed herein. However, it should be understood that the present application can be implemented in a variety of different forms and is not limited to the embodiments described below.

[0017] This application provides an electromagnetic brake that can be used in the braking system of mechanical equipment such as lawn mowers. Figures 1-2 show a specific embodiment of the electromagnetic brake of this application. The electromagnetic brake shown includes a housing 10, a friction member 20 and a movable assembly 30 disposed within the housing, and a handle 40 drivingly connected to the movable assembly 30.

[0018] The housing 10 is generally a flat cylindrical structure, with a space formed inside for mounting the friction member 20 and the movable assembly 30. A handle 40 is disposed 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 facilitate user identification of 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 assembly 30 to move axially relative to the housing 10 between a braking position and a release position, switching the brake state.

[0019] As shown in Figures 5-6, when the handle 40 is in the first position, the movable assembly 30 is in the braking position, axially abutting against the friction member 20, preventing the friction member 20 from moving, and the electromagnetic brake is engaged. As shown in Figures 7-8, when the handle 40 is in the second position, the movable assembly 30 is in the releasing position, axially separating from the friction member 20, no longer restricting the movement of the friction member 20, and the electromagnetic brake is released.

[0020] As shown in Figures 2 and 3, a connection portion 42 is formed at one end of the handle 40, and an operating portion 44 is formed at the other end. The connection portion 42 is generally circular, superimposed on the center of the outer side of the housing 10, and connected to the movable assembly 30. A protrusion 46 is provided on the side of the connection portion 42 facing the housing 10, and the protrusion 46 is preferably an integral structure with the connection portion 42. The outer side surface of the housing 10 (i.e., the side facing the handle 40) is provided with a first action surface 12 and a second action surface 14. The first action surface 12 and the second action surface 14 are both located on the rotation path of the protrusion 46, wherein the second action surface 14 is axially protruding relative to the first action surface 12, and the two form a certain axial height difference.

[0021] As shown in FIG5 , when the handle 40 is in the first position, the protrusion 46 faces the first operating surface 12. As shown in FIG7 , when the handle 40 is rotated to the second position, the protrusion 46 faces the second operating surface 14. Due to the axial height difference between the first operating surface 12 and the second operating surface 14, the handle 40 simultaneously moves axially relative to the housing 10 as it rotates relative to the housing 10, thereby driving the movable assembly 30 to move axially from the braking position to the released position.

[0022] In this embodiment, the protrusion 46 is a block-shaped structure that extends downward from the outer edge of the connecting portion 42 of the handle 40. Preferably, there are multiple protrusions 46. In the figure, there are three protrusions 46, 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.

[0023] In this embodiment, a flange 11 protrudes from the outer side of the housing 10. The outer end surface of the flange 11 is partially concave to form a groove, the bottom of which constitutes a first operating surface 12. The portion of the outer end surface of the flange 11 outside the groove constitutes a second operating surface 14. The number of first and second operating surfaces 12, 14 corresponds to the number of protrusions 46, and preferably, there are multiple first and second operating surfaces 12, 14, arranged alternately along the circumference. Preferably, an inclined guide surface 13 is formed between adjacent first and second operating surfaces 12, 14, allowing the protrusions 46 to slide smoothly between the first and second operating surfaces 12, 14.

[0024] As shown in Figures 5-6, when the electromagnetic brake is in the braking state, the handle 40 is in the first position. At this point, the protrusion 46 of the handle 40 faces the first operating surface 12. The protrusion 46 extends into the groove, allowing the connecting portion 42 of the handle 40 to approach the flange 11. The movable assembly 30 is in the braking position, abutting against the friction member 20, preventing the friction member 20 and the connected equipment (such as the motor) from operating, achieving the braking effect.

[0025] As shown in Figures 7-8, when the electromagnetic brake is released, the handle 40 rotates to the second position. At this point, the protrusion 46 slides out of the groove and faces the second operating surface 14, causing the connecting portion 42 of the handle 40 to be pushed outward relative to the flange 11 of the housing 10, driving the movable assembly 30 to move axially away from the friction member 20. This moves the movable assembly 30 to the released position and separates it from the friction member 20, allowing the friction member 20 and the connected equipment to operate normally.

[0026] The electromagnetic brake of the above embodiment of the present application, through the cooperation of the protrusion 46 of the handle 40 and the two action surfaces 12 and 14 of different axial heights on the housing 10, can move in the axial direction while the handle 40 rotates in the circumferential direction, thereby driving the movable component 30 to move axially to release the braking state, which can effectively deal with special situations such as power failure and facilitate user use. In some embodiments, the protrusion 46 can also be set on the outer surface of the housing 10, and the first action surface 12 and the second action surface 14 can be set 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 action surface 12 and the second action surface 14 of different axial heights to achieve axial movement of the handle 40, thereby driving the movable component 30 to move in the axial direction, releasing the braking of the electromagnetic brake.

[0027] In some embodiments, a limiting structure 16 is protruding from the outer edge of the housing 10. The limiting structure 16 includes a first stopper 161 and a second stopper 163 spaced apart in the circumferential direction. The operating portion 44 of the handle 40 rotates between the first stopper 161 and the second stopper 163. When the operating portion 44 rotates to abut against the first stopper 161, it reaches the first position (as shown in FIG5 ); when the operating portion 44 rotates to abut against the second stopper 163 (as shown in FIG7 ), it reaches the second position. Preferably, the end of the operating portion 44 of the handle 40 extends radially outward relative to the housing 10 by a certain length, making it convenient for the user to operate directly or through other components. By providing the limiting structure 16 on the housing 10, the rotational travel of the handle 40 is limited, saving operating space. The user does not need to consider the rotation angle during operation, further facilitating the user's operation.

[0028] In some embodiments, the edge of the housing 10 is further provided with a positioning protrusion 18, and the operating portion 44 of the handle 40 is correspondingly provided with a positioning hole 48. The positioning protrusion 18 is positioned 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, locking the handle 40 in the braking position and preventing accidental release of the handle 40 due to vibration or the like. Preferably, the positioning protrusion 18 is a hemispherical structure, which smoothly engages and exits the positioning hole 48 during the rotation of the handle 40, making operation more labor-saving for the user.

[0029] In some embodiments, the housing 10 may be provided with another positioning protrusion near the second stopper 163 , so that when the handle 40 rotates to the second position, the positioning protrusion snaps into the positioning hole 48 to lock the handle 40 in the release position.

[0030] As shown in Figures 2 and 4 , the first stopper 161 is an inverted L-shaped structure, comprising a first stopper 167 and a second stopper 165 that are perpendicular to each other. When the handle 40 is in the first position, the first stopper 167 is located circumferentially outside the operating portion 44, limiting the handle 40 in the circumferential direction and preventing the handle 40 from rotating excessively. The second stopper 165 is located axially above the operating portion 44, limiting the handle 40 so that the positioning protrusion 18 can be engaged and retained in the positioning hole 48.

[0031] In some embodiments, the handle 40 can be rotated from the first position to the second position in a clockwise direction as shown by the arrow in Figure 7, that is, the handle 40 is rotated in a clockwise direction to release the brake. In some embodiments, the handle 40 can also be rotated from the first position to the second position in a counterclockwise direction, that is, the handle 40 is rotated in a counterclockwise direction 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 wheel or right wheel of the vehicle, the handle 40 can be set to release the brake by rotating it in a clockwise direction or counterclockwise direction. In some embodiments, if brakes are respectively set on the left and right wheels of the vehicle, two limiting structures 16 can be symmetrically provided on the housing 10, corresponding to the operation of rotating the brake release handle 40 from different sides.

[0032] As shown in Figure 2, the movable assembly 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 (the top end, shown in Figure 2) extends through a central hole in the housing 10 and out of the housing 10, where it plugs into the connection portion 42 of the handle 40. The other end (the bottom end, shown in Figure 2) is connected to the armature 34 via the connector 36. When the handle 40 is rotated, the shaft 32 drives the armature 34 axially, causing it to abut or separate from the friction member 20. Preferably, the armature 34 and the friction member 20 are both thin, disc-shaped structures. When they abut against each other, they can fully contact and generate sufficient friction to restrict the movement of the friction member 20.

[0033] In some embodiments, a sealing ring 50 is sleeved on the shaft 32. Preferably, a rim 19 is provided around the outer side of the housing 10 surrounding the perforation, with a ring groove 190 formed in the rim 19 (as shown in FIG6 ). The sealing ring 50 is embedded in the ring groove 19, thereby forming a sealed connection between the outer wall of the shaft 32 and the outer side of the housing 10, preventing external moisture, dust, etc. from entering the housing 10 and affecting the operation of the electromagnetic brake. Preferably, a flange 11 is provided around the rim 19, and the height of the flange 11 relative to the outer surface of the housing 10 is less than the height of the rim 19 relative to the outer surface of the housing 10. The connecting portion 42 of the handle 40 is supported by the rim 19.

[0034] In some embodiments, a retaining ring 52 is clamped at the end of the outer end of the shaft 32, and the retaining ring 52 is superimposed on the outer side surface of the connecting portion 42 of the handle 40 (i.e., the side facing away from the shell 10), limiting the relative movement of the handle 40 and the shaft 32 in the axial direction, so that when the handle 40 is lifted up, it can drive the shaft 32 to move in a direction away from the shell 10.

[0035] In some embodiments, an elastic member 38 is sleeved around the shaft 32. The elastic member 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). Preferably, it is a coil spring. When the electromagnetic brake is in operation, the elastic member 38 is naturally stretched or slightly deformed. When the electromagnetic brake is released, the upward movement of the shaft 32 compresses and deforms the elastic member 38. When the electromagnetic brake is reactivated, the elastic member 38 recovers its deformation, pushing the shaft 32 downward to reset, maintaining the movable assembly 30 in contact with the friction member 20.

[0036] In the illustrated embodiment, the shaft 32 can be constructed as a pin, rivet, or similar structure, with its inner end forming a head portion 33 of larger diameter. A through-hole is provided in the center of the connector 36. The shaft 32 passes upward through the through-hole of the connector 36 and the through-hole in the center of the housing 10, and then plugs into the connecting portion 42 of the handle 40. The head portion 33 of the connector 36 abuts against the lower edge of the through-hole, with the elastic member 38 clamped between the head portion 33 and the housing 10.

[0037] Preferably, a wear-resistant sheet 54 is provided between the rim 19 of the housing 10 and the connecting portion 32 of the handle 30 , and a wear-resistant sheet 56 is provided between the inner side surface of the housing 10 and the elastic member 38 .

[0038] The electromagnetic brake of the present application is preferably a non-excitation 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 member 20 are respectively located on both axial sides of the armature 34. When the excitation coil 62 is not energized, there is no force acting on the armature 34, and the armature 34 remains in a state of abutting against the friction member 20, that is, the electromagnetic brake remains in a braking state; when the excitation coil 62 is energized, a magnetic field is generated to drive the armature 34 to separate from the friction member 20, releasing the braking state. In the braking state, there is a certain distance between the armature 34 and the stator assembly 60 in the axial direction; after the brake is released, the armature 34 moves toward the stator assembly 60, and the two may be abutting against each other or there may be a certain gap.

[0039] In some embodiments, the housing 10 of the electromagnetic brake is a cylindrical structure with one end open, 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 cover plate 70 and the end surface of the open end of the housing 10. The electromagnetic brake can be connected to other devices, such as a motor, through the cover plate 70, and the rotating shaft of the motor can pass through the cover plate 70 and be connected 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.

[0040] Preferably, a sleeve 74 is disposed between the cover plate 70 and the stator housing 64. The sleeve 74 provides axial support for the stator assembly 60, allowing for a gap between the stator assembly 60 and the armature 34, facilitating axial movement of the armature 34. Preferably, multiple sleeves 74 are provided, spaced circumferentially. The stator housing 64 and the cover plate 70 are provided with fixing holes at positions corresponding to the sleeves. Screws 59, etc., pass through the corresponding fixing holes and sleeves 74 to securely connect the stator housing 64 to the cover plate 70. Preferably, the outer diameter of the armature 34 is approximately equal to that of the stator housing 64. The outer edge of the armature 34 is provided with a notch 35 for receiving the sleeve 74. This not only facilitates 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 deflection.

[0041] The electromagnetic brake of this application utilizes a handle 40 that cooperates with the housing 10. The handle 40 rotates and simultaneously generates axial movement, driving the movable assembly 30 to move axially and separate from the friction member 20, thereby manually releasing the brake. This facilitates user convenience in special situations such as power failure and provides for a simple overall structure.

[0042] It should be noted that the above embodiments merely represent preferred implementations of the present application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the present application. It should be noted that those skilled in the art may, without departing from the spirit of the present application, make various modifications and improvements, such as combining different features from the various embodiments, and all of these modifications and improvements should fall within the scope of protection of the present application.

Claims

1. An electromagnetic brake, comprising a housing, a friction member and a movable assembly arranged in the housing, and a handle arranged outside the housing and connected to the movable assembly, characterized in that: One of the handle and the housing is provided with a convex portion, and the other of the handle and the housing is provided with a first action surface and a second action surface, wherein the first action surface and the second action surface have a height difference in the axial direction; The handle can be rotated between a first position and a second position relative to the shell. When the handle is in the first position, the protrusion faces the first action surface, and the movable component abuts against the friction member. When the handle is rotated to the second position, the protrusion faces the second action surface, and the movable component is axially separated from the friction member relative to the shell.

2. The electromagnetic brake according to claim 1, characterized in that An inclined guide surface is arranged between the first action surface and the second action surface.

3. The electromagnetic brake according to claim 1, characterized in that The convex portion is integrally formed by the handle and protrudes toward the housing, and the first action surface is farther away from the handle than the second action surface; When the handle is in the first position, the convex portion abuts against the first action surface; when the handle is rotated to the second position, the convex portion abuts against the second action surface.

4. The electromagnetic brake according to claim 1, characterized in that The outer edge of the shell is protrudingly 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 is inserted into the positioning hole.

5. The electromagnetic brake according to claim 4, characterized in that A limiting structure is protrudingly provided on the outer edge of the shell, and the limiting structure includes a first stopper and a second stopper spaced apart in the circumferential direction; The handle rotates between the first stopper and the second stopper. When the handle is in a first position, it abuts against the first stopper; when the handle is in a second position, it abuts against the second stopper.

6. The electromagnetic brake according to claim 5, characterized in that The first stopper is in an inverted L-shape and comprises a first stopper portion and a second stopper portion which 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.

7. The electromagnetic brake according to claim 3, characterized in that A flange is provided on a side of the shell facing the handle, the outer end surface portion of the flange is concave to form the first action surface, and the remaining portion of the outer end surface of the flange forms the second action surface.

8. The electromagnetic brake according to claim 7, characterized in that A ring edge is provided at the center of one side of the housing facing the handle to support the handle; The flange is arranged around the annular edge, and a height of the flange relative to the outer protrusion of the shell is smaller than a height of the annular edge relative to the outer protrusion of the shell.

9. The electromagnetic brake according to any one of claims 1 to 8, characterized in that: The movable assembly includes a shaft and an armature connected to one end of the shaft, and the other end of the shaft extends out of the housing and is connected to the handle; The brake further comprises a stator assembly, wherein the stator assembly comprises an excitation coil, and the excitation coil and the friction member are respectively arranged on two axial sides of the armature.

10. The electromagnetic brake according to claim 9, characterized in that A sealing ring is arranged between the shaft and the outer side surface of the shell.

11. The electromagnetic brake according to claim 9, characterized in that An elastic member is sleeved on the shaft rod, one end of the elastic member abuts against the housing, and the other end of the elastic member abuts against one end of the shaft rod connected to the armature.

12. The electromagnetic brake according to claim 9, characterized in that The shell is a cylindrical structure with one end open, a cover plate is provided at the open end of the shell, a sleeve is provided between the stator assembly and the cover plate, and a notch is provided in the armature for passing the sleeve.

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