Motor braking device

Abstract

The utility model provides a kind of motor brake device, it is related to motor brake technical field, the utility model provides the motor brake device including brake assembly and motor assembly, brake assembly includes brake disc, base and the first brake pad of being installed on base, motor assembly includes end cover and the power output shaft of being rotationally cooperated with end cover, end cover and base adopt integrated structure, power output shaft is fixedly connected with brake disc.The utility model provides the motor brake device has reduced production cost and weight, improves brake system overall strength, enhances mechanical stability, satisfies high-strength brake demand and the like advantages.

Description

Technical Field

[0001] This utility model relates to the field of motor braking technology, and in particular to a motor braking device. Background Technology

[0002] In the combined structure of mechanical braking components and motors, the design of the braking components directly affects the performance and reliability of the entire system. With the widespread application of brushless DC motors in industrial automation, electric vehicles, and other fields, the requirements for braking systems are becoming increasingly stringent.

[0003] Conventional mechanical brake assemblies typically employ a separate design, where the brake disc is connected to the motor end cover via screws. This design performs adequately in low-torque motors, but in high-torque brushless DC motors, insufficient screw strength leads to uneven stress distribution, causing motor vibration during braking. If the mounting screws loosen, the entire braking system may fail. Furthermore, this separate design increases the complexity and cost of the assembled structure. Utility Model Content

[0004] The purpose of this utility model is to provide an electric motor braking device, which has the advantages of reducing production costs and weight, improving the overall strength of the braking system, enhancing mechanical stability, and meeting the requirements of high-intensity braking.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] In a first aspect, the present invention provides a motor braking device, including a braking assembly and a motor assembly. The braking assembly includes a brake disc, a base, and a first brake pad mounted on the base. The motor assembly includes an end cover and a power output shaft that rotatably engages with the end cover. The end cover and the base are integrally formed, and the power output shaft is fixedly connected to the brake disc.

[0007] In an optional embodiment, the end cap is provided with a reinforcing rib on the side opposite to the braking assembly, and a first screw hole is provided at the reinforcing rib, the first screw hole penetrating the end cap and the base.

[0008] In an optional embodiment, there are two first screw holes, and the base is recessed to provide a mounting cavity for mounting the first brake pad, the mounting cavity being located between the two first screw holes.

[0009] In an optional embodiment, the end cap has an annular stop protruding on the side opposite to the braking assembly, and the outer surface of the annular stop has a groove for installing a sealing ring.

[0010] In an optional embodiment, the first brake pad is located on one side of the power output shaft along the radial direction of the power output shaft, and the first brake pad has a first friction surface facing the brake disc.

[0011] In an optional embodiment, the side of the first friction surface away from the axis of the power output shaft is an arc edge, and the projection of the first friction surface falls within the projection of the brake disc.

[0012] In an optional embodiment, the circle corresponding to the arc edge is concentric with the circle corresponding to the outer arc surface of the brake disc.

[0013] In an optional embodiment, the side of the first friction surface closest to the axis of the power output shaft is a first extension side. The two ends of the first extension side are connected to the two ends of the arc side through a second extension side and a third extension side, respectively. The first extension side, the second extension side and the third extension side all extend in a straight line, and the first extension side is perpendicular to the second extension side and the third extension side.

[0014] In an optional embodiment, the braking assembly further includes a second brake pad, which is disposed opposite to the first brake pad on both sides of the brake disc, and the shape of the second brake pad is the same as that of the first brake pad.

[0015] In an optional embodiment, the motor assembly further includes an oil seal and a retaining ring. The oil seal is connected to the end cover and is sleeved outside the power output shaft. The retaining ring is connected to the end cover and is used to limit the axial position of the oil seal relative to the end cover.

[0016] The electric motor braking device provided by this utility model can produce the following beneficial effects:

[0017] 1. The end cap and base adopt an integrated structure, which reduces the number of parts and simplifies the assembly process, thereby reducing production costs and making the whole device smaller and lighter.

[0018] 2. Since the end cap and the base are an integral structure, it avoids the problem of uneven stress distribution caused by insufficient screw strength in traditional split structures, which can easily lead to motor vibration during braking. This significantly improves the overall strength of the braking system, eliminates the installation gap risk of split structures, and enhances mechanical stability.

[0019] 3. The integrated structure reduces reliance on screw connections, lowering the risk of overall brake system failure due to loose screws;

[0020] 4. Applicable to high-torque brushless DC motor scenarios. When the brake disc and the first brake pad are in friction braking, the force on the first brake pad can be directly transmitted to the base and end cover with an integrated structure, meeting the high-intensity braking requirements. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 A cross-sectional view of a motor braking device provided in an embodiment of this utility model;

[0023] Figure 2 A left-side view of an end cap provided in an embodiment of this utility model;

[0024] Figure 3 A right-side view of an end cap provided for an embodiment of this utility model;

[0025] Figure 4 A left-side view of a motor braking device provided in an embodiment of this utility model;

[0026] Figure 5 A cross-sectional view of a partial structure of an electric motor braking device provided in an embodiment of this utility model;

[0027] Figure 6 for Figure 5 Enlarged view of point B;

[0028] Figure 7 for Figure 4 A-A cross-sectional view;

[0029] Figure 8 This is a schematic diagram of the structure of a first friction surface provided in an embodiment of the present invention.

[0030] Icons: 1 - Braking assembly; 11 - Brake disc; 12 - Base; 121 - Mounting cavity; 13 - First brake pad; 131 - First friction surface; 1311 - Arc edge; 1312 - First extension edge; 1313 - Second extension edge; 1314 - Third extension edge; 14 - Second brake pad; 15 - Housing; 16 - Handle; 17 - Torsion spring; 18 - Screw; 19 - Slider; 2 - Motor assembly; 21 - End cap; 211 - Reinforcing rib; 212 - First screw hole; 213 - Annular stop; 214 - Groove; 22 - Power output shaft; 23 - Oil seal; 24 - Snap ring; 25 - Housing; 26 - Magnetic braided base; 27 - Magnetic braided circuit board; 28 - Wiring harness; 29 - Waterproof connector. Detailed Implementation

[0031] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0035] The first aspect of this utility model provides a motor braking device, such as... Figure 1 and Figure 2 As shown, it includes a braking assembly 1 and a motor assembly 2. The braking assembly 1 includes a brake disc 11, a base 12 and a first brake pad 13 mounted on the base 12. The motor assembly 2 includes an end cover 21 and a power output shaft 22 that rotatably engages with the end cover 21. The end cover 21 and the base 12 adopt an integral structure, and the power output shaft 22 is fixedly connected to the brake disc 11.

[0036] See Figure 1 As shown, the end cap 21 and the base 12 adopt an integrated structure. The end cap 21 and the base 12 do not need to be connected by screws, which avoids the problem of uneven stress distribution due to insufficient screw strength and the failure of the entire braking system due to loose screws, thus improving the overall strength of the braking system. At the same time, there will be no gap between the end cap 21 and the base 12, which enhances mechanical stability.

[0037] The integrated design of the end cap 21 and the base 12 can also reduce the number of parts, reduce production costs, and make the whole device smaller and lighter.

[0038] Under normal operating conditions, the power output shaft 22 drives the brake disc 11 to rotate. After braking, under the action of external force, the brake disc 11 rubs against the first brake pad 13. The force on the first brake pad 13 can be directly transmitted to the base 12 and end cover 21 with an integrated structure, which meets the high-intensity braking requirements and is suitable for high-torque brushless DC motor scenarios.

[0039] Specifically, such as Figure 1 and Figure 2 As shown, the end cap 21 is installed at the end of the housing 25. The end cap 21 has a base 12 protruding on the side opposite to the housing 25. The base 12 has a mounting cavity 121 for installing the first brake pad 13.

[0040] The end cap 21 and the base 12 can be integrally molded by injection molding or by CNC machine tool processing. Of course, other methods can also be used for integral molding.

[0041] In an optional embodiment, the end cap 21 has a reinforcing rib 211 on the side facing away from the braking assembly 1, such as... Figure 3 As shown, a first screw hole 212 is provided at the reinforcing rib 211, and the first screw hole 212 passes through the end cover 21 and the base 12.

[0042] During assembly, screws and other connecting parts can pass through the housing 15 in the brake assembly 1 and be screwed into the first screw hole 212 to connect the housing 15 with the base 12.

[0043] The above-described embodiment, by creating a first screw hole 212 at the reinforcing rib 211, utilizes the high mechanical strength of the reinforcing rib 211 itself to disperse stress concentration during screw connection. Simultaneously, since the reinforcing rib 211 typically possesses high rigidity and resistance to deformation, placing the first screw hole 212 at this location effectively prevents excessive local stress caused by screw tightening, thereby reducing the risk of fatigue or damage to the end cap 21 material. Furthermore, due to the presence of the reinforcing rib 211, the material at the first screw hole 212 is less prone to plastic deformation or creep, thus reducing the likelihood of loosening of the connection due to vibration or other external forces during long-term use.

[0044] In alternative implementations, such as Figure 2 As shown, there are two first screw holes 212, and the mounting cavity 121 is located between the two first screw holes 212.

[0045] Since the mounting cavity 121 is located between the two first screw holes 212, the base 12 on both sides of the mounting cavity 121 is stably connected to the outer shell 15, thereby ensuring the stability of the brake disc 11 and the first brake pad 13.

[0046] In alternative implementations, such as Figure 5 and Figure 6 As shown, the end cap 21 has an annular stop 213 protruding on the side opposite to the brake assembly 1.

[0047] The design of the annular stop 213 provides a clear positioning reference for the end cover 21. During the assembly process, the annular stop 213 can be aligned with the inner wall of the housing 25, so that the axis of the end cover 21 can be aligned with the axis of the housing 25, thereby improving the assembly accuracy of the end cover 21 and the housing 25.

[0048] Specifically, such as Figure 6 As shown, the outer surface of the annular stop 213 is recessed with a groove 214 for installing the sealing ring.

[0049] The sealing ring installed in the groove 214 can effectively improve the sealing performance between the end cover 21 and the inner wall of the housing 25. By embedding the sealing ring in the groove 214, it is ensured that the sealing ring is fixed in position and subjected to uniform force, thus avoiding seal failure due to external pressure or vibration.

[0050] In alternative implementations, such as Figure 5 As shown, the first brake pad 13 is located on one side of the power output shaft 22 along the radial direction of the power output shaft 22. The first brake pad 13 has a first friction surface 131 facing the brake disc 11. The first friction surface 131 and the brake disc 11 achieve braking through friction.

[0051] In alternative implementations, such as Figure 5As shown, the braking assembly 1 also includes a second brake pad 14, which is disposed opposite to the first brake pad 13 on both sides of the brake disc 11. The shape of the second brake pad 14 is the same as that of the first brake pad 13. During braking, the first brake pad 13 and the second brake pad 14 rub against the brake disc 11 on both sides of the brake disc 11 to achieve braking.

[0052] Specifically, such as Figure 7 As shown, the braking assembly 1 also includes a handle 16, a torsion spring 17, and a screw 18. The screw 18 is fixedly connected to the housing 15, and the handle 16 is slidably engaged with the screw 18. The torsion spring 17 is located between the housing 15 and the handle 16. A slider 19 is slidably connected inside the housing 15, and the sliding direction of the slider 19 is parallel to the rotation axis of the brake disc 11. In use, the handle 16 slides relative to the screw 18, causing the handle 16 to push the slider 19 to slide relative to the housing 15. The slider 19 pushes the second brake pad 14 closer to the brake disc 11, so that both sides of the brake disc 11 rub against the first brake pad 13 and the second brake pad 14 respectively, thereby achieving braking.

[0053] The above braking process is based on the existing braking principle. To save space, detailed explanations will not be provided.

[0054] In addition, the size of the handle 16, screw 18, brake disc 11 and other structures are related to the model of motor assembly 2 and the required braking intensity. The specific dimensions of the above structures are not limited here, and users can adjust them as needed.

[0055] In the prior art, the first friction surface 131 of the first brake pad 13 and the second friction surface of the second brake pad 14 are both rectangular. Since the surfaces of the brake disc 11 facing the first and second friction surfaces are circular, the two corners of the first and second friction surfaces away from the rotation axis of the brake disc 11 do not rub against the brake disc 11. After prolonged operation of the motor, the first and second friction surfaces will wear down, leaving residue on the corners of the brake disc 11 where they do not contact the first and second friction surfaces. The edges of these residues will rub against the periphery of the brake disc 11, easily causing friction noise even when the brakes are not applied. Furthermore, these residues can prevent the first and second brake pads 13 and 14 from being used together, thus limiting the service life of the braking assembly 1.

[0056] In this regard, in optional implementations, such as Figure 8 As shown, the side of the first friction surface 131 away from the axis of the power output shaft 22 is an arc edge 1311, and it is projected onto the cross-section of the power output shaft 22 along the axial direction of the power output shaft 22. The projection of the first friction surface 131 falls within the projection of the brake disc 11.

[0057] It is understandable that the cross-section of the power output shaft 22 is perpendicular to the axial direction of the power output shaft 22.

[0058] The above-described embodiments can avoid the problem of residual edges and corners on the first friction surface 131 after long-term use, increase the service life of the braking assembly 1, and prevent abnormal noises during normal operation of the motor.

[0059] In an optional embodiment, the circle corresponding to the arc edge 1311 is concentric with the circle corresponding to the outer arc surface of the brake disc 11.

[0060] The above configuration makes the contact and force distribution between the arc edge 1311 and the brake disc 11 more uniform, avoiding the problem of local stress concentration on the first friction surface 131 due to eccentricity, thereby extending the service life of the brake disc 11 and the first brake pad 13.

[0061] Specifically, the radii of the circle corresponding to the arc edge 1311 and the circle corresponding to the outer arc surface of the brake disc 11 can be equal or unequal.

[0062] When the radii of the two circles are equal, the arc edge 1311 is aligned with the outer arc surface of the brake disc 11 along the axis of the brake disc 11. This facilitates the quick determination of the installation position of the first brake pad 13, making the circle corresponding to the arc edge 1311 on the first brake pad 13 concentric with the circle corresponding to the outer arc surface of the brake disc 11.

[0063] In alternative implementations, such as Figure 8 As shown, the side of the first friction surface 131 closest to the axis of the power output shaft 22 is the first extension edge 1312. The two ends of the first extension edge 1312 are connected to the two ends of the arc edge 1311 through the second extension edge 1313 and the third extension edge 1314 respectively. The first extension edge 1312, the second extension edge 1313 and the third extension edge 1314 all extend in a straight line, and the first extension edge 1312 is perpendicular to the second extension edge 1313 and the third extension edge 1314.

[0064] In the above embodiments, the shape of the first friction surface 131 can be formed by cutting off the two corners of the existing first friction surface, which facilitates the processing of the first friction surface 131 and at the same time preserves the effective friction area of ​​the first friction surface 131 as much as possible, without affecting the braking performance of the braking assembly 1.

[0065] Since the second brake pad 14 is positioned opposite to the first brake pad 13 and both have the same shape, the shape of the second brake pad 14 will not be described in detail to save space.

[0066] In addition, the size of the first friction surface 131 and the second friction surface are related to factors such as the size of the brake disc 11 and the required braking intensity. Therefore, their size is not limited here, and users can adjust them as needed.

[0067] In alternative implementations, such as Figure 5 As shown, the motor assembly 2 also includes an oil seal 23 and a retaining ring 24. The oil seal 23 is connected to the end cover 21 and is sleeved on the outside of the power output shaft 22. The retaining ring 24 is connected to the end cover 21.

[0068] In the above embodiment, the motor assembly 2 is provided with a retaining ring 24. The retaining ring 24 can limit the axial position of the oil seal 23 relative to the end cover 21, and prevent it from axially displacing when the power output shaft 22 rotates or is subjected to external vibration. This helps to maintain the working performance of the entire motor assembly 2 and avoids sealing failure caused by the displacement of the oil seal 23.

[0069] In alternative implementations, such as Figure 5 As shown, the motor assembly 2 also includes a magnetic braiding base 26, a magnetic braiding circuit board 27, a wire harness 28, and a waterproof connector 29. The magnetic braiding base 26 is sleeved on the outside of the power output shaft 22, the magnetic braiding circuit board 27 is installed inside the housing 25, and the wire harness 28 is connected to the housing 25 and a waterproof connector 29 is provided between the wire harness 28 and the housing 25 to play a role in waterproof sealing.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A motor braking device, characterized in that, The device includes a braking assembly (1) and a motor assembly (2). The braking assembly (1) includes a brake disc (11), a base (12), and a first brake pad (13) mounted on the base (12). The motor assembly (2) includes an end cover (21) and a power output shaft (22) rotatably engaged with the end cover (21). The end cover (21) and the base (12) are integrally formed. The power output shaft (22) is fixedly connected to the brake disc (11).

2. The motor braking device according to claim 1, characterized in that, The end cap (21) is provided with a reinforcing rib (211) on the side opposite to the braking assembly (1), and a first screw hole (212) is provided at the reinforcing rib (211), the first screw hole (212) passing through the end cap (21) and the base (12).

3. The motor braking device according to claim 2, characterized in that, The first screw hole (212) is configured as two, and the base (12) is recessed with a mounting cavity (121) for mounting the first brake pad (13), the mounting cavity (121) being located between the two first screw holes (212).

4. The motor braking device according to claim 1, characterized in that, The end cap (21) has an annular stop (213) protruding on the side opposite to the brake assembly (1), and the outer surface of the annular stop (213) has a groove (214) for installing a sealing ring.

5. The motor braking device according to claim 1, characterized in that, The first brake pad (13) is located on one side of the power output shaft (22) along the radial direction of the power output shaft (22), and the first brake pad (13) has a first friction surface (131) facing the brake disc (11).

6. The motor braking device according to claim 5, characterized in that, The side of the first friction surface (131) away from the axis of the power output shaft (22) is an arc edge (1311), and the projection of the first friction surface (131) falls within the projection of the brake disc (11).

7. The motor braking device according to claim 6, characterized in that, The circle corresponding to the arc edge (1311) is concentric with the circle corresponding to the outer arc surface of the brake disc (11).

8. The motor braking device according to claim 6, characterized in that, The side of the first friction surface (131) closest to the axis of the power output shaft (22) is a first extension edge (1312). The two ends of the first extension edge (1312) are connected to the two ends of the arc edge (1311) through the second extension edge (1313) and the third extension edge (1314), respectively. The first extension edge (1312), the second extension edge (1313) and the third extension edge (1314) all extend in a straight line, and the first extension edge (1312) is perpendicular to the second extension edge (1313) and the third extension edge (1314).

9. The motor braking device according to claim 1, characterized in that, The braking assembly (1) further includes a second brake pad (14), the second brake pad (14) and the first brake pad (13) are respectively disposed opposite to each other on both sides of the brake disc (11), and the shape of the second brake pad (14) is consistent with the shape of the first brake pad (13).

10. The motor braking device according to claim 1, characterized in that, The motor assembly (2) further includes an oil seal (23) and a retaining ring (24). The oil seal (23) is connected to the end cover (21) and is sleeved on the outside of the power output shaft (22). The retaining ring (24) is connected to the end cover (21) and is used to limit the axial position of the oil seal (23) relative to the end cover (21).

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