Electromagnetic brake

Abstract

The utility model provides a kind of electromagnetic brake, the electromagnetic brake includes the shell, clutch plate, friction disc and tail plate in turn stacked along preset path, the preset path is parallel to the axial direction of the shell, the shell is equipped with the elastic member and excitation coil acting on the clutch plate;Multiple first slots extending along its radial direction are opened on the clutch plate, the opening of the first slot extends to the outer ring of the clutch plate, and penetrates the clutch plate along the axial direction of the clutch plate, so that the clutch plate is composed of multiple action pieces evenly distributed around its axis;The elastic member includes multiple brake springs, multiple brake springs are one-to-one corresponding with the action piece Setting, and for abutting on the action piece. The electromagnetic brake provided by the utility model is more uniform to the friction effect of friction disc, reduces the local wear of friction disc;Metal powder accumulation in friction area can be reduced, so as to improve the service life of friction disc.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical braking technology, specifically relating to an electromagnetic brake. Background Technology

[0002] The electromagnetic brake includes a friction disc, clutch plate, excitation coil, housing, brake spring, and tail plate. When the excitation coil is not energized, the brake is in a braking state; when the excitation coil is energized, the brake is in a released state.

[0003] Currently, the tailplate structure in electromagnetic brakes is a circular flat plate structure. During braking, the excitation coil is de-energized, and the elastic force of the brake spring acts on the clutch plate, causing the clutch plate to press against the friction disc. Because the clutch plate of the circular flat plate structure is a rigid structure, the elastic force is unevenly distributed under the pressure of the brake spring, resulting in higher local pressure and a maximum of three contact points. The frictional contact between the clutch plate and the friction disc is uneven. Due to the disc shape of the clutch plate, the linear velocity is proportional to the radius. During rotation, the linear velocity of the outer ring of the friction disc is greater than that of the inner ring, causing the inner ring of the friction disc to wear faster. This leads to uneven brake clearance, affecting the braking performance and shortening the service life of the brake. Utility Model Content

[0004] This utility model provides an electromagnetic brake, which aims to achieve a uniform distribution of elastic braking force on the clutch plate, thereby making the friction force evenly distributed, reducing brake wear, and extending the service life of the brake.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an electromagnetic brake is provided, comprising a housing, a clutch plate, a friction disc, and a tail plate stacked sequentially along a preset path, wherein the preset path is parallel to the axial direction of the housing, and an elastic element and an excitation coil acting on the clutch plate are provided inside the housing.

[0006] The clutch plate has a plurality of first slots extending radially therefrom, the openings of the first slots extending to the outer ring of the clutch plate and penetrating the clutch plate along the axial direction of the clutch plate, so that the clutch plate is composed of a plurality of action plates evenly distributed around its axis.

[0007] The elastic element includes a plurality of braking springs, each of which is arranged in a corresponding manner to the actuating plate and is used to abut against the actuating plate.

[0008] In one possible implementation, a connecting member is provided between the housing and each of the actuating plates, and the braking spring is provided in a one-to-one correspondence with the connecting member, with the braking spring sleeved on the outer periphery of the connecting member.

[0009] In one possible implementation, multiple elastic elements are located on the outer ring of the friction disc.

[0010] In one possible implementation, the clutch plate is further provided with a mounting groove that extends through the clutch plate along its axial direction and communicates with the first groove. The mounting groove is used to accommodate an aluminum tube.

[0011] In some embodiments, multiple mounting slots are provided and are distributed one-to-one with aluminum tubes, and the multiple mounting slots are evenly distributed around the axis of the clutch plate.

[0012] In some embodiments, a plurality of mounting slots are provided in a one-to-one correspondence with a plurality of first slots, and the centerline of the mounting slot coincides with the centerline of the corresponding first slot.

[0013] In some embodiments, the width of the mounting groove is greater than the width of the first slot, and forms the opening of the first slot.

[0014] In one possible implementation, the tail plate is provided with a second slot extending radially therefrom, the second slot penetrating the tail plate axially.

[0015] In some embodiments, the number of the second slots is equal to the number of the first slots, and the second slots are staggered with the first slots.

[0016] In one possible implementation, the friction disc includes a first annular portion located on the inner periphery and a second annular portion located on the outer periphery. The inner circumferential surface of the second annular portion is fixedly connected to the outer circumferential surface of the first annular portion. The two end faces of the second annular portion protrude from the two end faces of the first annular portion and are used to rub against the actuating plate. The inner circumferential surface of the second annular portion is located inside the first slot.

[0017] In this embodiment, compared with the prior art, when the brake is in the braking state, the excitation coil is de-energized, and multiple springs on the elastic element abut against multiple action plates. Because adjacent action plates are spaced by a first slot, the clutch plate has a certain degree of flexibility compared to the traditional rigid structure, causing the action plates to undergo a certain elastic deformation. Each action plate then abuts against the friction disc, achieving braking of the friction disc through frictional contact. The clutch plate of this electromagnetic brake resembles a petal structure, composed of multiple action plates, achieving multi-point contact between the clutch plate and the friction disc. Furthermore, the brake springs correspond one-to-one with the action plates, ensuring that the elastic force or pressure borne by the clutch plate is evenly distributed on each action plate. Even if wear occurs on the friction disc, the action plates can remain pressed against the friction disc under the compression of the brake springs, resulting in a more uniform frictional effect on the friction disc and reducing localized wear. In addition, the multiple first slots on the clutch plate reduce the accumulation of metal powder in the friction area, thereby improving the lifespan of the friction disc and effectively optimizing the performance of the brake. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the electromagnetic brake provided in Embodiment 1 of this utility model;

[0019] Figure 2 For along Figure 1 Schematic diagram of the cross-sectional structure along line AA;

[0020] Figure 3 This is a schematic diagram of the front view structure of the clutch plate used in Embodiment 1 of this utility model;

[0021] Figure 4 This is a schematic diagram of the main structure of the tail plate used in Embodiment 1 of this utility model;

[0022] Figure 5 This is a schematic diagram of the front view structure of the clutch plate used in Embodiment 2 of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 10-Casing;

[0025] 20-Clutch plate; 21-First slot; 22-Actuating plate; 23-Mounting slot;

[0026] 30 - Friction disc; 31 - First annular portion; 32 - Second annular portion;

[0027] 40 - Tailplate; 41 - Second slot;

[0028] 50 - Elastic element; 51 - Brake spring;

[0029] 60-Connector;

[0030] 70-Aluminum. Detailed Implementation

[0031] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0032] Please refer to the following: Figures 1 to 5 The electromagnetic brake provided by this utility model will now be described. The electromagnetic brake includes a housing 10, a clutch plate 20, a friction disc 30, and a tail plate 40 stacked sequentially along a preset path. The preset path is parallel to the axial direction of the housing 10. The housing 10 is provided with an elastic element 50 acting on the clutch plate 20 and an excitation coil. The clutch plate 20 has a plurality of first slots 21 extending radially thereon. The openings of the first slots 21 extend to the outer ring of the clutch plate 20 and penetrate the clutch plate 20 along the axial direction, so that the clutch plate 20 is composed of a plurality of actuating plates 22 evenly distributed around its axis. The elastic element 50 includes a plurality of braking springs 51, which are arranged one-to-one with the plurality of actuating plates 22 and are used to abut against the actuating plates 22.

[0033] Compared with the prior art, the electromagnetic brake provided in this embodiment is de-energized when the brake is in the braking state. Multiple springs on the elastic element 50 abut against multiple action plates 22 respectively. Since the adjacent action plates 22 are separated by the first slot 21, the clutch plate 20 has a certain degree of flexibility compared with the traditional rigid structure, so that the action plates 22 undergo a certain elastic deformation. Then, each action plate 22 abuts against the friction disc 30, and the friction contact between the action plate 22 and the friction disc 30 is used to brake the friction disc 30. The clutch plate 20 of this electromagnetic brake has a petal-like structure, consisting of multiple actuating plates 22. This allows for multi-point contact between the clutch plate 20 and the friction disc 30. Each actuating plate 22 corresponds to a braking spring 51, ensuring that the elastic force or pressure on the clutch plate 20 is evenly distributed across each actuating plate 22. Even if wear occurs on the friction disc 30, the actuating plates 22 remain pressed against the friction disc 30 under the pressure of the braking spring 51, resulting in more uniform friction and reducing localized wear. Furthermore, the multiple first slots 21 on the clutch plate 20 reduce metal powder accumulation in the friction area, thereby improving the lifespan of the friction disc 30 and effectively optimizing the brake's performance.

[0034] In some embodiments, an improved implementation of the housing 10 described above may employ, as follows: Figures 1 to 2 The structure shown. See also Figures 1 to 2A connecting member 60 is provided between the housing 10 and each actuating plate 22. A braking spring 51 is provided in a corresponding manner to the connecting member 60, and the braking spring 51 is sleeved on the outer periphery of the connecting member 60. The housing 10 and each connecting member 60 are connected by the connecting member 60, which can improve the axial stability of each actuating plate 22 in the housing 10; the braking spring 51 is sleeved on the outer periphery of the connecting member 60, which can guide the extension and contraction process of the braking spring 51 and improve the uniformity of the elastic force distribution.

[0035] In some embodiments, a specific implementation of the plurality of elastic elements 50 may employ, as follows: Figure 1 The structure shown. See also Figure 1 Multiple elastic elements 50 are located on the outer ring of the friction disc 30. When the elastic elements 50 abut against the actuating plate 22, because they are located on the outer periphery of the friction disc 30, the actuating plate 22 can make uniform contact with the friction disc 30 along the radial direction of the friction plate, increasing the contact surface with the friction disc 30 and optimizing the braking effect.

[0036] In some embodiments, an improved implementation of the clutch plate 20 may employ, as follows: Figure 1 , Figure 3 and Figure 5 The structure shown. See also Figure 1 , Figure 3 and Figure 5 The clutch plate 20 also has a mounting groove 23, which extends through the clutch plate 20 along its axial direction and communicates with the first slot 21. The mounting groove 23 is used to accommodate the aluminum tube 70. When the brake is installed on the motor, it needs to be connected to the motor housing 10, the clutch plate 20, and the tail plate 40 by bolts. The aluminum tube 70 is fitted onto the bolts and is located between the clutch plate 20 and the tail plate 40 to adjust the gap between the clutch plate 20 and the tail plate 40. By providing a mounting groove 23 that communicates with the first slot 21 to accommodate the aluminum tube 70, it is convenient to determine the installation position of the aluminum tube 70 and to simplify the subsequent installation steps.

[0037] In some embodiments, a specific implementation of the mounting slot 23 may employ, as follows: Figure 5 The structure shown. See also Figure 5 Multiple mounting slots 23 are provided, each corresponding to one of the aluminum tubes 70. The mounting slots 23 are evenly distributed around the axis of the clutch plate 20. The number of mounting slots 23 facilitates the determination of the number of aluminum tubes 70 to be used, allowing for one-to-one installation and simplifying the installation process.

[0038] In some embodiments, an improved implementation of the mounting slot 23 described above can employ, as follows: Figure 1 and Figure 3 The structure shown. See also Figure 1 and Figure 3Multiple mounting slots 23 are configured one-to-one with multiple first slots 21, and the centerline of the mounting slot 23 coincides with the centerline of the corresponding first slot 21. Therefore, the number of mounting slots 23 is equal to the number of first slots 21. Generally, three aluminum tubes 70 are installed, but the number of first slots 21 is usually greater than three. Thus, the number of mounting slots 23 is relatively large. During actual installation, not every mounting slot 23 contains an aluminum tube 70. The large number of mounting slots 23 can be adjusted according to the torque range to determine the number of aluminum tubes 70 installed. The coincidence of the centerline of the mounting slot 23 with the centerline of the first slot 21 ensures structural consistency, thereby ensuring the consistency of the deformation of the clutch plate 20.

[0039] It should be noted that the centerline of the mounting groove 23 and the centerline of the first slot 21 are both parallel to the radial direction of the clutch plate 20.

[0040] In some embodiments, a specific implementation of the mounting slot 23 and the first slot 21 can be as follows: Figure 1 , Figure 3 and Figure 5 The structure shown. See also Figure 1 , Figure 3 and Figure 5 The width of the mounting groove 23 is greater than the width of the first slot 21, forming an opening in the first slot 21. The mounting groove 23 is used to accommodate the aluminum tube 70, so it needs to be set to correspond to the outer diameter of the aluminum tube 70. If the width of the first slot 21 is equal to the width of the mounting groove 23, the width will be too wide, affecting the overall strength of the clutch plate 20. Therefore, the width of the first slot 21 is smaller, which ensures the overall strength of the clutch plate 20 while also limiting the installation process of the aluminum tube 70.

[0041] In some embodiments, an improved implementation of the tailplate 40 may employ, as follows: Figure 2 The structure shown. See also Figure 1 and Figure 4 The tail plate 40 has a second slot 41 extending radially therein, and the second slot 41 passes through the tail plate 40 axially. When the brake is in the braking state, the brake spring 51 moves against the clutch plate 20 and close to the friction disc 30, so that the two ends of the friction disc 30 abut against the clutch plate 20 and the tail plate 40 respectively. The tail plate 40 also has a second slot 41, which can deform appropriately in response to the deformation of the clutch plate 20 during braking. Both the clutch plate 20 and the tail plate 40 achieve multi-point contact with the friction disc 30, ensuring better contact and reducing the wear of the friction disc 30.

[0042] In some embodiments, a specific implementation of the second slot 41 described above can be as follows: Figure 1 The structure shown. See also Figure 1The number of second slots 41 is equal to the number of first slots 21, and the second slots 41 and the first slots 21 are staggered. Optionally, if the number of first slots 21 on the clutch plate 20 is 12, then the number of second slots 41 on the tail plate 40 is also 12. Since the second slots 41 and the first slots 21 are staggered, the projection of the second slot 41 along the axial direction of the tail plate 40 is located in the middle of two adjacent first slots 21, that is, the included angle between the first slots 21 and the second slots 41 is 30°. This layout allows the deformation process between the clutch plate 20 and the tail plate 40 to complement each other, ensuring the friction intensity of the friction disc 30 while making the break-in more uniform.

[0043] In some embodiments, an improved implementation of the friction disc 30 described above can employ, as follows: Figure 2 The structure shown. See also Figure 2 The friction disc 30 includes a first annular portion 31 located on the inner circumference and a second annular portion 32 located on the outer circumference. The inner circumferential surface of the second annular portion 32 is fixedly connected to the outer circumferential surface of the first annular portion 31. The two end faces of the second annular portion 32 protrude from the two end faces of the first annular portion 31 and are used to rub against the actuating plate 22. The inner circumferential surface of the second annular portion 32 is located inside the first slot 21. When the brake is in the braking state, the brake spring 51 pushes the clutch plate 20, and each brake spring 51 acts on one actuating plate 22. The actuating plate 22 undergoes appropriate deformation and abuts against the friction disc 30. Each actuating plate 22 contacts the second annular portion 32 on the friction disc 30 to achieve friction; the friction between the tail plate 40 and the friction disc 30 is similar. The second annular portion 32 forms the friction area of ​​the friction disc 30, so braking is mainly achieved through the friction between the second annular portion 32 and the clutch plate 20 and the tail plate 40, resulting in good braking strength.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An electromagnetic brake, characterized in that, It includes a housing, a clutch plate, a friction disc, and a tail plate stacked sequentially along a preset path, wherein the preset path is parallel to the axial direction of the housing, and the housing is provided with an elastic element and an excitation coil acting on the clutch plate. The clutch plate has a plurality of first slots extending radially therefrom, the openings of the first slots extending to the outer ring of the clutch plate and penetrating the clutch plate along the axial direction of the clutch plate, so that the clutch plate is composed of a plurality of action plates evenly distributed around its axis. The elastic element includes a plurality of braking springs, each of which is arranged in a corresponding manner to the actuating plate and is used to abut against the actuating plate.

2. The electromagnetic brake as described in claim 1, characterized in that, A connecting member is provided between the housing and each of the actuating plates. The brake spring is provided in a one-to-one correspondence with the connecting member, and the brake spring is sleeved on the outer periphery of the connecting member.

3. The electromagnetic brake as described in claim 1 or 2, characterized in that, The plurality of elastic elements are located on the outer ring of the friction disc.

4. The electromagnetic brake as described in claim 1, characterized in that, The clutch plate is also provided with a mounting groove, which extends through the clutch plate along the axial direction and communicates with the first groove. The mounting groove is used to accommodate the aluminum tube.

5. The electromagnetic brake as described in claim 4, characterized in that, The mounting slots are provided in multiple ways and are distributed one-to-one with the aluminum tubes. The multiple mounting slots are evenly distributed around the axis of the clutch plate.

6. The electromagnetic brake as described in claim 4, characterized in that, The mounting slots are provided in a one-to-one correspondence with the first slots, and the center line of the mounting slot coincides with the center line of the corresponding first slot.

7. The electromagnetic brake as described in claim 5 or 6, characterized in that, The width of the mounting groove is greater than the width of the first slot, and forms the opening of the first slot.

8. The electromagnetic brake as described in claim 1, characterized in that, The tail plate is provided with a second slot extending radially therefrom, and the second slot penetrates the tail plate axially.

9. The electromagnetic brake as described in claim 8, characterized in that, The number of the second slots is equal to the number of the first slots, and the second slots are staggered with the first slots.

10. The electromagnetic brake as claimed in claim 1, characterized in that, The friction disc includes a first annular portion located on the inner circumference and a second annular portion located on the outer circumference. The inner circumferential surface of the second annular portion is fixedly connected to the outer circumferential surface of the first annular portion. The two end faces of the second annular portion protrude from the two end faces of the first annular portion and are used to rub against the actuating plate. The inner circumferential surface of the second annular portion is located inside the first slot.

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