Motor braking device

Abstract

The invention provides a motor braking device, and relates to the technical field of motor braking, the motor braking device provided by the invention comprises a braking assembly and a motor assembly, the braking assembly comprises a brake disc, a base and a first brake pad installed on the base, and the motor assembly comprises an end cover and a power output shaft rotationally matched with the end cover. The end cover and the base are of an integrated structure, and the power output shaft is fixedly connected with the brake disc. The motor braking device has the advantages that the production cost and weight are reduced, the overall strength of a braking system is improved, the mechanical stability is enhanced, and the high-strength braking requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of motor braking, and more particularly to a motor braking device. Background Art

[0002] In the combined structure of a mechanical brake braking component and a motor, the design of the brake braking component directly affects the performance and reliability of the entire system. With the wide application of brushless DC motors in fields such as industrial automation and electric vehicles, the requirements for the braking system are also getting higher and higher.

[0003] Conventional mechanical brake braking components usually adopt a split design, that is, the brake disc is connected to the motor end cover by screws. This design performs well in low-torque motors, but in high-torque brushless DC motors, due to the insufficient strength of the screws, the stress distribution is uneven, and the motor is prone to tremor during braking. If the installation screws become loose, the entire braking system may fail. At the same time, this split design also increases the complexity and cost of the combined structure. Summary of the Invention

[0004] The purpose of the present invention is to provide a 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 purpose, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides a motor braking device, including a braking component and a motor component. The braking component includes a brake disc, a base, and a first brake pad installed on the base. The motor component includes an end cover and a power output shaft rotatably fitted with the end cover. The end cover and the base adopt an integral structure, and the power output shaft is fixedly connected to the brake disc.

[0007] In an optional embodiment, a reinforcing rib is provided on a side of the end cover facing away from the braking component, and a first screw hole is provided in the reinforcing rib, and the first screw hole penetrates through the end cover and the base.

[0008] In an optional embodiment, two first screw holes are configured, and the base is recessed with an installation cavity for installing the first brake pad, and the installation cavity is located between the two first screw holes.

[0009] In an optional embodiment, an annular stop is convexly provided on a side of the end cover facing away from the braking component, and a groove for installing a sealing ring is recessed on an outer surface of the annular stop.

[0010] In an alternative 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 arranged facing the brake disc.

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

[0012] In an alternative 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 alternative embodiment, one side of the first friction surface close to the axis of the power output shaft is a first extension edge, and both ends of the first extension edge are connected to both ends of the arc edge through a second extension edge and a third extension edge respectively. The first extension edge, the second extension edge, and the third extension edge all extend linearly, and the first extension edge is perpendicular to the second extension edge and the third extension edge.

[0014] In an alternative embodiment, the braking assembly further includes a second brake pad. The second brake pad and the first brake pad are respectively arranged on both sides of the brake disc relatively, and the shape of the second brake pad is the same as that of the first brake pad.

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

[0016] The electric motor braking device provided by the present invention can achieve the following beneficial effects:

[0017] 1. The end cover and the base adopt an integrated structure. By reducing the number of components and simplifying the assembly process, the production cost is reduced, and at the same time, the volume of the whole device is smaller and the weight is lighter.

[0018] 2. Since the end cover and the base are of an integrated structure, it avoids the phenomenon that the stress distribution is uneven due to insufficient strength of the screws in the traditional split structure, and it is easy to have motor tremors during braking. It significantly improves the overall strength of the braking system, eliminates the risk of installation gaps in the split structure, and enhances the mechanical stability.

[0019] 3. The integrated structure setting reduces the dependence on screw connections and reduces the risk of overall failure of the braking system caused by screw loosening.

[0020] 4. Applicable to the scenario of high-torque brushless DC motors, when the brake disc and the first brake pad undergo frictional braking, the force received by the first brake pad can be directly transmitted to the base and the end cover with an integrated structure, meeting the high-strength braking requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 A cross-sectional view of an electric motor braking device provided by an embodiment of the present invention;

[0023] Figure 2 A left side view of an end cover provided by an embodiment of the present invention;

[0024] Figure 3 A right side view of an end cover provided by an embodiment of the present invention;

[0025] Figure 4 A left side view of an electric motor braking device provided by an embodiment of the present invention;

[0026] Figure 5 A cross-sectional view of a partial structure of an electric motor braking device provided by an embodiment of the present invention;

[0027] Figure 6 For Figure 5 an enlarged schematic view at position B;

[0028] Figure 7 For Figure 4 a cross-sectional view taken along line A - A;

[0029] Figure 8 A schematic structural view of a first friction surface provided by an embodiment of the present invention.

[0030] Icon: 1 - Brake assembly; 11 - Brake disc; 12 - Base; 121 - Installation 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 - Outer shell; 16 - Handle; 17 - Torsion spring; 18 - Screw; 19 - Slide block; 2 - Motor assembly; 21 - End cover; 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 encoder seat; 27 - Magnetic encoder circuit board; 28 - Wiring harness; 29 - Waterproof connector. Detailed implementation

[0031] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

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

[0033] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0034] The following will describe in detail the specific implementation of the present invention in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only for explaining and interpreting the present invention, and is not used to limit the present invention.

[0035] An embodiment of the first aspect of the present invention is to provide an electric motor braking device, as Figure 1 and Figure 2As shown in the figure, it includes a braking component 1 and a motor component 2. The braking component 1 includes a brake disc 11, a base 12, and a first brake pad 13 installed on the base 12. The motor component 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 of an integral structure, and the power output shaft 22 is fixedly connected to the brake disc 11.

[0036] See Figure 1 As shown in the figure, the end cover 21 and the base 12 are of an integral structure, and there is no need to connect them by screws between the end cover 21 and the base 12, avoiding the problems of uneven stress distribution caused by insufficient screw strength and overall failure of the braking system caused by screw loosening, improving the overall strength of the braking system. At the same time, there will be no gap between the end cover 21 and the base 12, enhancing mechanical stability.

[0037] The integral design of the end cover 21 and the base 12 can also reduce the number of components, lower the production cost, and at the same time make the whole device smaller in volume and lighter in weight.

[0038] In the normal working state, the power output shaft 22 drives the brake disc 11 to rotate. After braking, under the action of an external force, the brake disc 11 and the first brake pad 13 rub against each other, and the force on the first brake pad 13 can be directly transmitted to the base 12 and the end cover 21 with an integral structure, meeting the high-strength braking requirements and being applicable to the scenario of high-torque brushless DC motors.

[0039] Specifically, as Figure 1 and Figure 2 shown in the figure, the end cover 21 is installed at the end of the housing 25, and a base 12 protrudes from the side of the end cover 21 facing away from the housing 25. The base 12 is recessed with an installation cavity 121 for installing the first brake pad 13.

[0040] The end cover 21 and the base 12 can be integrally formed by injection molding or by machining on a numerically controlled machine tool. Of course, other methods can also be used for integral forming.

[0041] In an alternative embodiment, a reinforcing rib 211 is provided on the side of the end cover 21 facing away from the braking component 1. As Figure 3 shown in the figure, a first screw hole 212 is provided in the reinforcing rib 211, and the first screw hole 212 penetrates through the end cover 21 and the base 12.

[0042] During assembly, a connecting member such as a screw can pass through the outer shell 15 in the braking component 1 and be screwed into the first screw hole 212 to realize the connection between the outer shell 15 and the base 12.

[0043] In the above-described embodiment, by providing the first screw holes 212 at the reinforcing ribs 211, the high mechanical strength of the reinforcing ribs 211 themselves can be utilized to disperse the stress concentration problem generated during screw connection. At the same time, since the reinforcing ribs 211 generally have high rigidity and anti-deformation ability, setting the first screw holes 212 here can effectively avoid excessive local stress caused by screwing the screws, thereby reducing the risk of fatigue or damage to the material of the end cover 21. Additionally, due to the presence of the reinforcing ribs 211, the material at the first screw holes 212 is not prone to plastic deformation or creep, thus reducing the phenomenon of connection loosening caused by vibration or other external forces during long-term use.

[0044] In an alternative embodiment, as Figure 2 shown, two first screw holes 212 are configured, and the installation cavity 121 is located between the two first screw holes 212.

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

[0046] In an alternative embodiment, as Figure 5 and Figure 6 shown, a circular stop 213 protrudes from the side of the end cover 21 facing away from the brake assembly 1.

[0047] The design of the circular stop 213 provides a clear positioning reference for the end cover 21. During the assembly process, the circular stop 213 can be aligned with the inner wall of the housing 25, enabling the axis of the end cover 21 to 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, as Figure 6 shown, a groove 214 for installing a sealing ring is recessed on the outer surface of the outer ring of the circular stop 213.

[0049] The sealing ring provided 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 into the groove 214, the position of the sealing ring can be ensured to be fixed and the force is evenly distributed, avoiding sealing failure caused by external pressure or vibration.

[0050] In an alternative embodiment, as Figure 5 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, and braking is achieved through friction between the first friction surface 131 and the brake disc 11.

[0051] In an alternative embodiment, as Figure 5As shown, 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 on both sides of the brake disc 11, and 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 respectively rub against the brake disc 11 on both sides of the brake disc 11 to achieve braking.

[0052] Specifically, as Figure 7 shown, the braking assembly 1 further includes a handle 16, a torsion spring 17 and a screw 18. The screw 18 is fixedly connected to the housing 15. 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 in the housing 15. The sliding direction of the slider 19 is parallel to the rotation axis of the brake disc 11. When in use, the handle 16 slides relative to the screw 18, so that the handle 16 pushes the slider 19 to slide relative to the housing 15. The slider 19 pushes the second brake pad 14 close to the brake disc 11, so that both sides of the brake disc 11 respectively rub against the first brake pad 13 and the second brake pad 14 to achieve braking.

[0053] The above braking process is an existing braking principle. To save space, the detailed details will not be specifically described.

[0054] In addition, the sizes of the structures such as the handle 16, the screw 18, and the brake disc 11 are related to factors such as the model of the motor assembly 2 and the required braking intensity. The specific sizes of the above structures are not limited here, and the user can adjust them according to needs.

[0055] In the prior art, the shape of 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 structures. Since the surface of the brake disc 11 facing the first friction surface 131 and the second friction surface is circular, the two corners of the first friction surface 131 and the second friction surface far from the rotation axis of the brake disc 11 do not rub against the brake disc 11. After the motor runs for a long time, the first friction surface 131 and the second friction surface will be worn, and residues will appear at the corner positions of the two sides of the brake disc 11 that are not in contact with the first friction surface 131 and the second friction surface. The edges of the residue part will rub against the periphery of the brake disc 11, and friction abnormal sounds are likely to occur even when not braking. In addition, the residue will also cause the first brake pad 13 and the second brake pad 14 to be unable to be used after being butted, which limits the service life of the braking assembly 1.

[0056] In response, in an alternative embodiment, as Figure 8 shown, one side of the first friction surface 131 far from the axis of the power output shaft 22 is an arc edge 1311, and when projected along the axis direction of the power output shaft 22 onto the cross-section 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 can be understood 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 embodiment can avoid the problem of corner residues on the first friction surface 131 after long-term use, increase the service life of the braking assembly 1, and avoid abnormal noises during the normal operation of the motor.

[0059] In an alternative 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 setting can make the contact and force distribution between the arc edge 1311 and the brake disc 11 more uniform, avoid the problem of local stress concentration on the first friction surface 131 caused by eccentricity, and thus extend the service life of the brake disc 11 and the first brake pad 13.

[0061] Specifically, the radius of the circle corresponding to the arc edge 1311 and the radius of 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 faces the outer arc surface of the brake disc 11 along the axis of the brake disc 11, which is convenient for quickly determining the installation position of the first brake pad 13, so that the circle corresponding to the arc edge 1311 on the first brake pad 13 is concentric with the circle corresponding to the outer arc surface of the brake disc 11.

[0063] In an alternative embodiment, as Figure 8 shown, one side of the first friction surface 131 close 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 embodiment, the shape of the first friction surface 131 can be directly formed by cutting off two corners from the existing first friction surface, which is convenient for the processing of the first friction surface 131. At the same time, it can retain 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 arranged opposite to the first brake pad 13 and they have the same shape, for the sake of brevity, the shape of the second brake pad 14 will not be described in detail.

[0066] In addition, the sizes 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 requirements for braking intensity. Therefore, the sizes of the two are not limited herein, and the user can adjust them according to needs.

[0067] In an alternative embodiment, as Figure 5 shown, the motor assembly 2 further includes an oil seal 23 and a circlip 24. The oil seal 23 is connected to the end cover 21, the oil seal 23 is sleeved outside the power output shaft 22, and the circlip 24 is connected to the end cover 21.

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

[0069] In an alternative embodiment, as Figure 5 shown, the motor assembly 2 further includes a magnetic encoder seat 26, a magnetic encoder circuit board 27, a wire harness 28, a waterproof connector 29, etc. The magnetic encoder seat 26 is sleeved outside the power output shaft 22, the magnetic encoder circuit board 27 is installed in the housing 25, 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, which plays a role in waterproof sealing.

[0070] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric motor braking device, characterized in that, 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) rotatably engaged with the end cover (21). The end cover (21) and the base (12) are of an integral structure, and the power output shaft (22) is fixedly connected to the brake disc (11).

2. The electric motor braking device according to claim 1, characterized in that On the side of the end cover (21) facing away from the braking assembly (1), there is a reinforcing rib (211), and a first screw hole (212) is provided at the reinforcing rib (211), and the first screw hole (212) penetrates through the end cover (21) and the base (12).

3. The electric motor braking device according to claim 2, characterized in that, There are two first screw holes (212) configured. The base (12) is recessed with an installation cavity (121) for installing the first brake pad (13), and the installation cavity (121) is located between the two first screw holes (212).

4. The electric motor braking device according to claim 1, characterized in that, On the side of the end cover (21) facing away from the braking assembly (1), there is a protruding annular stop (213), and a groove (214) for installing a sealing ring is recessed on the outer circumferential surface of the annular stop (213).

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

7. The electric 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 electric motor braking device according to claim 6, wherein, One side of the first friction surface (131) close 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 respectively connected to the two ends of the arc edge (1311) through a second extension edge (1313) and a third extension edge (1314). The first extension edge (1312), the second extension edge (1313), and the third extension edge (1314) all extend linearly, and the first extension edge (1312) is perpendicular to the second extension edge (1313) and the third extension edge (1314).

9. The electric machine 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 arranged on both sides of the brake disc (11) relatively, and the shape of the second brake pad (14) is the same as that of the first brake pad (13).

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

Images