Brake motor

Abstract

The utility model discloses a brake motor, which comprises a rotating shaft, a friction plate and an armature, and is characterized in that a brake assembly part integrated with the rotating shaft is formed on the outer wall of the rotating shaft; the friction plate is provided with a shaft hole matched with the outer peripheral wall of the brake assembly part in shape, and the friction plate is arranged on the brake assembly part in a sleeving mode through the shaft hole and abuts against the outer peripheral wall of the rotating shaft for limiting; the armature sleeves the rotating shaft and is located on one side of the friction plate. The armature can be close to or away from the friction plate in the axis direction of the rotating shaft. The utility model aims to solve the problem that the performance of a brake motor is affected due to low assembly perpendicularity of a square wheel and a rotating shaft.

Description

Technical Field

[0001] The utility model relates to the technical field of brake motors, in particular to a brake motor. Background Art

[0002] Brake motors are widely used, usually using electromagnetic coils to attract the armature to move, and the armature or cover plate contacts the friction plate to achieve the braking function. The electromagnetic brake based on square wheel and friction plate braking is an electromagnetic brake that sets the square wheel on the outside of the shaft and the friction plate on the outside of the square wheel. The friction plate is located between the armature and the cover plate, the armature is located between the stator and the friction plate, the electromagnetic coil is located inside the stator, and the cover plate is connected to the armature. When the electromagnetic coil is energized, it attracts the armature and drives the cover plate to move synchronously toward the stator, contacting the friction plate to achieve braking.

[0003] Generally, the central through hole of the friction plate is a square hole, and the outer wall of the square wheel is also square, so the friction plate and the square wheel can be directly connected to prevent rotation (prevent relative rotation between the two). During assembly, the square wheel is first cold-pressed onto the rotating shaft and an interference fit is adopted between the square wheel and the rotating shaft, and then other components are assembled.

[0004] The assembly process of the square wheel and the shaft has very high requirements for the verticality of the assembly of the square wheel and the shaft. The verticality that can be achieved by the existing process is limited. Due to the machining accuracy of the shaft, the machining accuracy of the square wheel and the matching accuracy, the verticality accuracy cannot be further improved. On the one hand, low verticality will cause the motor torque to decrease, affecting the performance and safety of the motor. On the other hand, it will cause irregular gaps between the friction plate and the armature and the flange, causing the brake motor to be easily impacted during operation, resulting in contact and slapping between the friction plate and the armature or flange, increasing the overall noise of the motor and affecting the user experience. Utility Model Content

[0005] The main purpose of the utility model is to provide a brake motor, aiming to solve the problem that the performance of the brake motor is affected by the low verticality of the assembly of the square wheel and the rotating shaft.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a brake motor, comprising:

[0007] A rotating shaft, wherein an outer wall of the rotating shaft is formed with a brake assembly portion which is an integral structure with the rotating shaft;

[0008] A friction plate, wherein the friction plate is provided with an axial hole that matches the shape of the outer peripheral wall of the brake assembly portion, the friction plate is sleeved on the brake assembly portion through the axial hole, and abuts against the outer peripheral wall of the brake assembly portion to limit position; and

[0009] An armature is sleeved on the rotating shaft and located on one side of the friction plate. The armature can approach or move away from the friction plate along the axial direction of the rotating shaft.

[0010] Optionally, the brake motor further comprises two limit members which are arranged on the rotating shaft and spaced apart along the axial direction of the rotating shaft, the friction plate is located between the two limit members, and the two limit members respectively abut against and limit the friction plate on opposite sides along the axial direction of the rotating shaft.

[0011] Optionally, the rotating shaft is provided with two limiting grooves spaced apart along the axial direction of the rotating shaft, partial structures of the two limiting members are respectively limited in the two limiting grooves, and other partial structures of the two limiting members are respectively in contact with the friction plates.

[0012] Optionally, the limiting groove is an annular groove opened along the circumference of the rotating shaft, and the limiting member is an annular rubber ring sleeved on the rotating shaft, and the circumferential side wall of the annular rubber ring abuts against the side wall of the annular groove.

[0013] Optionally, the brake assembly part is a brake square wheel.

[0014] Optionally, a notch is provided at the connection between two adjacent sides of the braking square wheel.

[0015] Optionally, the brake assembly portion includes a plurality of spline teeth spaced apart from each other on the rotating shaft, each of the spline teeth is extended axially along the rotating shaft, and a spline groove is formed between two adjacent spline teeth.

[0016] Optionally, the friction plate is formed with a plurality of convex teeth arranged at intervals along the circumference of the rotating shaft, and the plurality of convex teeth are correspondingly inserted into the plurality of spline grooves.

[0017] Optionally, the outer peripheral wall of the rotating shaft is provided with a plurality of spline teeth spaced apart from each other, each of the spline teeth is extended axially along the rotating shaft, and a spline groove is formed between two adjacent spline teeth, wherein the partial structure of the plurality of spline teeth extending axially along the rotating shaft serves as the braking assembly portion.

[0018] Optionally, each of the spline teeth is provided with a first groove and a second groove spaced apart along the axial direction of the rotating shaft, a plurality of the first grooves are spaced apart along the circumference of the rotating shaft to jointly form a first annular groove surrounding the circumference of the rotating shaft, a plurality of the second grooves are spaced apart along the circumference of the rotating shaft to jointly form a second annular groove surrounding the circumference of the rotating shaft, and the friction plate is sleeved on the outer sides of the plurality of spline teeth located between the first annular groove and the second annular groove;

[0019] The brake motor also includes two annular rubber rings, part of the structures of the two annular rubber rings are respectively limited in the first annular groove and the second annular groove, and the other part of the structures of the two limiting members are respectively abutted against the opposite sides of the friction plate along the axial direction of the rotating shaft for limiting.

[0020] The utility model can reduce the problem of poor precision caused by secondary processing and assembly in the original process by designing the brake assembly part and the rotating shaft into an integrated structure. It can not only ensure the verticality accuracy between the brake assembly part and the rotating shaft to meet higher precision requirements, ensure the braking torque of the brake motor, and ensure the performance and safety of the brake motor, but also save machining costs and shorten working hours; in addition, the friction plate can be vertically rotated with the rotating shaft without contact with the armature and the flange, which is conducive to eliminating the slapping sound of the friction plate, the armature and the flange when the brake motor is running, and reducing the running noise of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the structure of an embodiment of the brake motor provided by the utility model;

[0023] Figure 2 A schematic diagram of the structure of an embodiment of the brake motor provided by the utility model;

[0024] Figure 3 The present invention is a schematic structural diagram of an embodiment of a brake motor provided by the present invention.

[0025] Description of Figure Numbers:

[0026] Label name Label name 100 Brake motor 12a Annular groove 1 Shaft 2 Friction plate 11 Brake assembly department 3 armature 11a Braking square wheel 4 Limiting parts 11b Spline teeth 4a Ring rubber ring 12 Limit slot 5 Flange

[0027] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0031] At present, the existing brake motor is limited by the process precision. The verticality of the square wheel and the rotating shaft is low after assembly. The matching form of the square wheel and the friction plate changes from surface contact to line contact, resulting in a decrease in the braking torque, affecting the performance and safety of the motor. After the brake is energized, the motor operates normally, and the friction plate and the square wheel rotate with the rotating shaft. Because the verticality of the square wheel and the rotating shaft is low after assembly, the friction plate does not rotate vertically, but forms a certain angle with the rotating shaft, which causes the friction plate to contact and slap with the armature or flange, generating noise, affecting the user experience.

[0032] For this reason, please see Figures 1 to 3 The present application provides a brake motor 100, including a rotating shaft 1, a friction plate 2 and an armature 3. The outer wall of the rotating shaft 1 is formed with a brake assembly part 11 which is an integral structure with the rotating shaft 1; the friction plate 2 is provided with an axial hole which is adapted to the shape of the outer peripheral wall of the brake assembly part 11, the friction plate 2 is sleeved on the brake assembly part 11 through the axial hole, and is abutted and limited with the outer peripheral wall of the brake assembly part 11; the armature 3 is sleeved on the rotating shaft 1 and is located on one side of the friction plate 2, and the armature 3 can approach or move away from the friction plate 2 along the axial direction of the rotating shaft 1.

[0033] The utility model can reduce the problem of poor precision caused by secondary processing and assembly in the original process by designing the brake assembly part 11 and the rotating shaft 1 into an integrated structure. It can not only ensure that the verticality accuracy between the brake assembly part 11 and the rotating shaft 1 meets higher precision requirements and ensure the braking torque of the brake motor 100 and the performance safety of the brake motor 100, but also save machining costs and shorten working hours. In addition, the friction plate 2 can be vertically operated with the rotating shaft 1 without contact with the armature 3 and the flange 5, which is conducive to eliminating the slapping sound of the friction plate 2, the armature 3 and the flange 5 when the brake motor 100 is running, and reducing the running noise of the motor.

[0034] It should be noted that, the above-mentioned "the friction plate 2 is provided with an axial hole adapted to the shape of the outer peripheral wall of the brake assembly part 11" and "the outer peripheral wall of the brake assembly part 11 abuts against the limiter" can be understood as limiting the function of the brake assembly part 11, that is, the brake assembly part 11 can achieve anti-rotation between the friction plate 2 and the rotating shaft 1. Then, in order to achieve the anti-rotation effect, the cross-sectional shape of the brake assembly part 11 needs to be designed as a non-circular structure (elliptical or square or other special shapes), and the shape of the axial hole of the friction plate 2 needs to be adapted to the shape of the brake assembly part.

[0035] In one embodiment of the present application, the brake assembly part 11 is set as a brake square wheel 11a, which can increase the contact area between the shaft 1 and the axial hole of the friction plate 2 while preventing rotation, thereby improving the stability of the connection between the friction plate 2 and the brake square wheel 11a, and can effectively ensure that the relative position between the friction plate 2 and the shaft 1 is fixed, thereby achieving a reliable braking effect.

[0036] Since modern CNC machine tools have high precision and rigidity, they can ensure the movement accuracy of the tool and the stability of the workpiece, so that the workpiece can achieve high processing accuracy during the turning process. Therefore, the brake assembly part 11 in the present application can be processed by shaft turning to ensure that the verticality accuracy between the brake assembly part 11 and the shaft 1 can be less than 0.03.

[0037] In order to further increase the contact area between the brake square wheel 11a and the friction plate 2, in one embodiment of the present application, a notch is provided at the connection between the two adjacent sides of the brake square wheel 11a. The notch design can increase the contact area between the friction plate 2 and the brake square wheel 11a, improve the transmission efficiency of the braking force, and maintain the stability and reliability of the braking system. The shape and angle of the notch need to be reasonably selected according to the actual situation and the design requirements of the braking system to ensure the best braking performance.

[0038] The rotating shaft 1 generally refers to the output shaft of the brake motor 100 or the shaft rod that is sleeved on the output shaft of the brake motor 100 and rotates synchronously therewith. The rotating shaft 1 is usually made of metal materials, such as steel or aluminum alloy. Therefore, the metal material can be cut or ground into the shape of the rotating shaft 1 with the brake assembly part 11 by mechanical processing methods such as turning, milling, and grinding. Since turning and milling can generally achieve higher processing accuracy, the brake assembly part 11 and the rotating shaft 1 can have better verticality accuracy while avoiding secondary assembly, and the friction plate 2 can be prevented from tilting when it is sleeved on the brake assembly part 11. Of course, in other embodiments of the present application, it is not limited to the above-mentioned centralized mechanical processing method, and the brake assembly part 11 can also be integrally formed on the rotating shaft 1. In some cases, the verticality accuracy between the brake assembly part 11 and the rotating shaft 1 can be further less than 0.01.

[0039] Considering that the brake motor 100 may vibrate during operation to displace the friction plate 2 , thereby affecting the braking effect of the brake motor 100 , ensuring the axial stability of the friction plate 2 is the key to the normal operation of the brake system.

[0040] See also Figure 1 In one embodiment of the present application, the brake motor 100 also includes two limit members 4 arranged on the rotating shaft 1 and spaced apart along the axial direction of the rotating shaft 1, the friction plate 2 is located between the two limit members 4, and the two limit members 4 are respectively abutted against the friction plate 2 on opposite sides along the axial direction of the rotating shaft 1 for limit.

[0041] like Figure 1 As shown, one side of one of the limiting members 4 close to the friction plate abuts against one side of the friction plate 2 for limiting position, and the other side of the limiting member 4 close to the friction plate abuts against the other side of the friction plate 2 for limiting position.

[0042] The axial displacement of the friction plate 2 may cause failure or performance degradation of the braking system. By setting two limit members 4, on the one hand, the friction plate 2 can be axially limited on both sides of the friction plate 2 to limit the movement of the friction plate 2 in the axial direction and ensure that the friction plate 2 always remains in the correct position. On the other hand, when the friction plate 2 contacts the armature 3 for braking, the two limit members 4 will also rub against the friction plate 2 to improve the braking torque and braking effect.

[0043] According to actual conditions and different design requirements, the limit member 4 can be a stop ring mounted on the rotating shaft 1 or a stop block connected to the rotating shaft 1, or it can be a limit protrusion or a limit protrusion ring integrally formed with the rotating shaft 1. When the limit member 4 is an additional stop ring or stop block, the limit member 4 can be fixed to the rotating shaft 1 by welding or screwing.

[0044] In order to simplify the production process, in one embodiment of the present application, the rotating shaft 1 is provided with two limiting grooves 12 spaced apart along the axial direction of the rotating shaft 1, and partial structures of the two limiting members 4 are respectively limited in the two limiting grooves 12, and the other partial structures of the two limiting members 4 are respectively in contact with the friction plate 2. The limiting groove 12 can be obtained by processing the rotating shaft 1 in the same process as the brake assembly portion 11, and the limiting member 4 can match the limiting groove 12. During installation, the partial structure of the limiting member 4 is inserted and limited in the two limiting grooves 12, which can further ensure the stability of the position of the limiting member 4 on the rotating shaft 1, and avoid displacement of the limiting member 4, which affects the limiting effect on the friction plate 2.

[0045] Further, in one embodiment of the present application, the limiting groove 12 is an annular groove 12a opened along the circumference of the rotating shaft 1, and the limiting member 4 is an annular rubber ring 4a sleeved on the rotating shaft 1, and the circumferential side wall of the annular rubber ring 4a abuts against the side wall of the annular groove 12a. The installation and removal of the annular rubber ring 4a are relatively simple, and do not require complex tools and techniques. Compared with other limiting members, the cost of the annular rubber ring 4a is relatively low, and the position of the friction plate 2 can be stably fixed under the premise of cost control. The annular rubber ring 4a made of soft rubber material can, on the one hand, buffer and reduce the damage to the friction plate 2 caused by friction to a certain extent, extend its service life, and reduce the noise of brake operation. On the other hand, the annular rubber ring 4a also has good elasticity and recovery performance. In the case of clearance fit or interference fit, it can be pressed in the limiting groove 12 to make it fit closely with the rotating shaft 1 and the friction plate 2, effectively improving the braking effect of the friction plate 2.

[0046] To increase the rotation backlash and thus improve the stability of the relative position of the friction plate 2, please refer to Figure 3 In one embodiment of the present application, the brake assembly portion 11 includes a plurality of spline teeth 11b spaced apart on the rotating shaft 1, each spline tooth 11b is extended along the axial direction of the rotating shaft 1, and a spline groove is formed between two adjacent spline teeth 11b. Correspondingly, the friction plate 2 is formed with a plurality of convex teeth spaced apart along the circumference of the rotating shaft 1, and the plurality of convex teeth are correspondingly inserted into the plurality of spline grooves.

[0047] The embodiment of the present application provides a larger contact area by forming a spline groove on the rotating shaft 1 to cooperate with the tooth protrusion on the friction plate 2, thereby ensuring the stability of the assembly of the friction plate 2 and the rotating shaft 1 and improving the anti-rotation capability.

[0048] When designing the spline structure, it is possible to consider reducing the size and number of the spline teeth 11b and selecting a suitable tooth profile and tooth pitch to reduce the difficulty of processing.

[0049] To reduce the difficulty of machining the spline teeth 11b in the middle of the shaft 1, please continue to refer to Figure 3In one embodiment of the present application, the outer peripheral wall of the rotating shaft 1 is provided with a plurality of spline teeth 11b which are spaced apart from each other on the rotating shaft 1, each of the spline teeth 11b is extended along the axial direction of the rotating shaft 1, and a spline groove is formed between two adjacent spline teeth 11b, wherein the partial structure of the plurality of spline teeth 11b extending along the axial direction of the rotating shaft 1 serves as the brake assembly portion 11.

[0050] When the spline teeth 11b are arranged to extend along the axial direction of the rotating shaft 1, the spline teeth 11b can be directly processed from one end of the rotating shaft 1 to the other end (such as by turning, milling, rolling or forging and other mechanical processing methods), and the spline teeth 11b structure without the friction plate 2 can also be used for limiting cooperation with other components to reduce the rotational backlash and thereby improve the stability of the assembly structure.

[0051] In order to adapt to the positioning structure of the annular rubber ring 4a, in one embodiment of the present application, each of the spline teeth 11b is provided with a first groove and a second groove which are arranged at intervals along the axial direction of the rotating shaft 1, and a plurality of the first grooves are arranged at intervals along the circumference of the rotating shaft 1 to jointly form a first annular groove which surrounds the circumference of the rotating shaft 1, and a plurality of the second grooves are arranged at intervals along the circumference of the rotating shaft 1 to jointly form a second annular groove which surrounds the circumference of the rotating shaft 1, and the friction plate 2 is sleeved on the outside of the structure of the plurality of spline teeth 11b located between the first annular groove and the second annular groove; the brake motor 100 also includes two annular rubber rings 4a, and partial structures of the two annular rubber rings 4a are respectively limited in the first annular groove and the second annular groove, and the other partial structures of the two limiting members 4 are respectively abutted against the opposite sides of the friction plate 2 along the axial direction of the rotating shaft 1 for limiting. It can be understood that the first annular groove and the second annular groove mentioned here are similar in structure to the annular groove 12a mentioned above and play the same role, but have different shapes corresponding to different brake assembly part 11 structures. Therefore, the first annular groove, the second annular groove and the annular groove 12a can be understood as the same structure.

[0052] When assembling the brake motor 100 of the present application, please Figure 1 Taking the rotating shaft 1 (the rotating shaft 1 extends in the left-right direction) as a reference, first, an annular rubber ring 4a is assembled in the annular groove 12a located on the right side of the braking square wheel 11a, and then the friction plate 2 is sleeved on the outer periphery of the braking square wheel 11a from left to right (since the width of the friction plate 2 is greater than the width of the annular groove 12a, it will not sink into it), and then another annular rubber ring 4a is pushed into the annular groove 12a located on the left side of the braking square wheel 11a by using a sleeve tool. At this time, the friction plate 2 is axially limited under the elastic action of the two annular rubber rings 4a.

[0053] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A brake motor, characterized in that: include: A rotating shaft, wherein an outer wall of the rotating shaft is formed with a brake assembly portion which is an integral structure with the rotating shaft; A friction plate, wherein the friction plate is provided with an axial hole that matches the shape of the outer peripheral wall of the brake assembly portion, the friction plate is sleeved on the brake assembly portion through the axial hole, and abuts against the outer peripheral wall of the brake assembly portion to limit position; and An armature is sleeved on the rotating shaft and located on one side of the friction plate. The armature can approach or move away from the friction plate along the axial direction of the rotating shaft.

2. The brake motor according to claim 1, characterized in that: The brake motor also includes two limit members arranged on the rotating shaft and spaced apart along the axial direction of the rotating shaft. The friction plate is located between the two limit members, and the two limit members are respectively abutted against and limited on opposite sides of the friction plate along the axial direction of the rotating shaft.

3. The brake motor according to claim 2, characterized in that: The rotating shaft is provided with two limiting grooves spaced apart along the axial direction of the rotating shaft, partial structures of the two limiting members are respectively limited in the two limiting grooves, and the other partial structures of the two limiting members are respectively in contact with the friction plates.

4. The brake motor according to claim 3, characterized in that: The limiting groove is an annular groove opened along the circumference of the rotating shaft, and the limiting member is an annular rubber ring sleeved on the rotating shaft, and the peripheral side wall of the annular rubber ring abuts against the side wall of the annular groove.

5. The brake motor according to any one of claims 1 to 4, characterized in that: The brake assembly part is a brake square wheel.

6. The brake motor according to claim 5, characterized in that: A notch is provided at the connection between two adjacent sides of the braking square wheel.

7. The brake motor according to any one of claims 1 to 4, characterized in that: The brake assembly portion includes a plurality of spline teeth spaced apart from each other on the rotating shaft, each of the spline teeth extending axially along the rotating shaft, and a spline groove is formed between two adjacent spline teeth.

8. The brake motor according to claim 7, characterized in that: The friction plate is formed with a plurality of convex teeth arranged at intervals along the circumference of the rotating shaft, and the plurality of convex teeth are correspondingly inserted into the plurality of spline grooves.

9. The brake motor according to claim 2, characterized in that: The outer peripheral wall of the rotating shaft is provided with a plurality of spline teeth spaced apart from each other, each of the spline teeth is extended axially along the rotating shaft, a spline groove is formed between two adjacent spline teeth, wherein the partial structure of the plurality of spline teeth extending axially along the rotating shaft serves as the brake assembly portion.

10. The brake motor according to claim 9, characterized in that: Each of the spline teeth is provided with a first groove and a second groove spaced apart along the axial direction of the rotating shaft, a plurality of the first grooves are spaced apart along the circumference of the rotating shaft to form a first annular groove surrounding the circumference of the rotating shaft, a plurality of the second grooves are spaced apart along the circumference of the rotating shaft to form a second annular groove surrounding the circumference of the rotating shaft, and the friction plate is sleeved on the outer sides of the plurality of spline teeth located between the first annular groove and the second annular groove; The brake motor also includes two annular rubber rings, part of the structures of the two annular rubber rings are respectively limited in the first annular groove and the second annular groove, and the other part of the structures of the two limiting members are respectively abutted against the opposite sides of the friction plate along the axial direction of the rotating shaft for limiting.

Images