A brake and motor

Abstract

The application provides a brake and a motor, the brake comprising: a support body; a first rotating body and a second rotating body, the first rotating body being fixed on a rotating shaft, the second rotating body being connected with the first rotating body under the action of extrusion force, the direction of the extrusion force being along the axial direction of the rotating shaft; and a brake part, the brake part comprising a fixed part fixed on the support body and a moving part fixed on the second rotating body, the moving part being capable of being clamped with or separated from the fixed part along the radial direction of the rotating shaft, so that the overall volume of an electromagnetic driving assembly can be reduced, and the axial dimension of the brake can also be reduced.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to a brake and a motor. Background Technology

[0002] Electromagnetic brakes are an important basic component that switches between holding and releasing states when power is on and off. They are mainly used for the safety braking of rotating mechanisms (such as motor devices). Currently, servo motors mainly use electromagnetic power-off brakes to ensure that the shaft does not move after power is cut off.

[0003] Traditional brakes achieve braking by applying pressure to friction pads using spring force. The electromagnetic force generated by the windings, exceeding the spring force, releases this pressure, thus achieving a non-braking state. Since the braking force of traditional brakes is spring force, and increasing the spring force inevitably increases the corresponding electromagnetic force of the windings, traditional brake springs generally have large elastic force, and the electromagnetic components are typically large in size.

[0004] To reduce the size of electromagnetic components, patent application number 202411340014 discloses a braking device and motor. During braking, the electromagnetic drive component only needs to switch the anti-rotation component from the second working position to the first working position to achieve braking. The magnitude of the braking torque depends on the squeezing force between the first and second rotating components, i.e., the elastic force of the first elastic element, rather than the force exerted by the electromagnetic drive component on the anti-rotation component. This allows the electromagnetic drive component to achieve braking of the rotating shaft with relatively low power consumption, reducing its power consumption. The magnetic field strength generated by the electromagnetic drive is also relatively low, resulting in less electromagnetic interference to the motor when the braking device is applied. The relatively small force generated by the electromagnetic drive component reduces its size, thus reducing space occupation and the weight of the braking device. In this patent, the anti-rotation component moves along the axial direction of the rotating shaft, and the stop component and the second rotating component are distributed along the axial direction with a certain gap between them. The axial dimension of the braking device is relatively large, which also results in a relatively large axial dimension of the motor incorporating this braking device.

[0005] How to reduce the axial dimension of the braking device while ensuring the size of the electromagnetic drive components, and thus reduce the axial dimension of the motor, is a technical problem that urgently needs to be solved. Summary of the Invention

[0006] Therefore, the present invention provides a brake and a motor that can reduce the overall volume of the electromagnetic drive assembly while also reducing the axial dimension of the brake.

[0007] This invention provides a brake for braking a rotating shaft, characterized in that the brake comprises:

[0008] Support structure;

[0009] A first rotating body and a second rotating body, wherein the first rotating body is fixed on the rotating shaft, and the second rotating body is connected to the first rotating body under the action of extrusion force, the direction of the extrusion force being along the axial direction of the rotating shaft;

[0010] The braking part includes a fixing member fixed to the support body and a moving member fixed to the second rotating body. The moving member can move along the radial direction of the rotating shaft to engage or disengage with the fixing member.

[0011] In some embodiments, the fixing member is provided with a groove with an opening facing the moving member, and the moving member is provided with a protrusion that can extend into the groove.

[0012] In some embodiments, the second rotating body is provided with an electromagnetic component, which is capable of driving the moving part to move.

[0013] In some embodiments, the electromagnetic component includes an electromagnetic part and a first elastic member, wherein when the electromagnetic part is energized, it enables the movable member to move away from the fixed member and compress the first elastic member.

[0014] In some embodiments, at least two limiting blocks are distributed on the second rotating body along the circumferential direction of the rotating shaft, and a sliding groove is formed between two adjacent limiting blocks, and the moving member is disposed in the sliding groove.

[0015] In some embodiments, in the circumferential direction of the rotating shaft, the inner wall of the groove includes opposing first inner side surfaces and second inner side surfaces, and the outer wall surface of the protrusion includes opposing first outer side surfaces and second outer side surfaces.

[0016] On the projection of the rotating shaft in the axial direction, a V-shaped groove with an opening facing away from the brake part is formed between the first inner side and the second inner side; a conical structure is formed between the first outer side and the second outer side, with the large end of the protrusion facing the groove and the small end of the protrusion facing away from the groove.

[0017] In some embodiments, the second rotating body includes a cylindrical plate, a first ring plate and a second ring plate spaced apart along the axial direction of the rotating shaft, the second ring plate being fixedly connected to one end of the cylindrical plate, and the first ring plate being detachably connected to the other end of the cylindrical plate by screws. The second rotating body also includes a first friction plate fixed to the first ring plate.

[0018] The first rotating body includes a rotating frame, which is fixed on the rotating shaft. The rotating frame includes a friction part, and the friction part and the first friction plate are disposed between the first ring plate and the second ring plate. A moving space is provided between the first ring plate and the cylindrical plate, and the first friction plate is pressed together with the friction part.

[0019] In some embodiments, an elastic washer is provided between the screw nut and the first ring plate.

[0020] In some embodiments, the first ring plate is provided with a countersunk hole for the screw to pass through, the countersunk hole including a countersunk surface facing the nut, and a compressed second elastic element is provided between the countersunk surface and the nut of the screw.

[0021] In some embodiments, the first rotating body further includes a second friction plate, which is fixedly disposed on the second ring plate and is pressed together with the friction part.

[0022] The present invention also provides an electric motor, including a rotating shaft, a housing, and the aforementioned brake, wherein the first rotating body is fixed on the rotating shaft, and the support body is the rear end cover of the electric motor.

[0023] The braking unit of the present invention includes a fixing member fixed on a support body and a moving member fixed on a second rotating body. By moving the moving member in the radial direction along the axis of rotation, it can engage or disengage with the fixing member, thereby reducing the size of the brake in the axial direction. Attached Figure Description

[0024] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0025] Figure 1 This is an exploded view of the brake and support body according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the brake being mounted on the support body according to an embodiment of the present invention;

[0027] Figure 3 This is an embodiment of the present invention. Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 This is an embodiment of the present invention. Figure 3 The diagram shows a countersunk screw hole.

[0029] Figure 5 This is a schematic diagram of an embodiment of the present invention where the cylindrical body and the second ring plate are an integral structure.

[0030] Figure 6 This is an embodiment of the present invention. Figure 5 Right view;

[0031] Figure 7 This is an embodiment of the present invention. Figure 5 Left view;

[0032] Figure 8 This is a schematic diagram of the moving part and the fixing part being engaged in an embodiment of the present invention;

[0033] Figure 9 This is an embodiment of the present invention. Figure 8 Enlarged view at point B in the middle;

[0034] Figure 10 This is a schematic diagram of the moving part and the fixed part being separated according to an embodiment of the present invention;

[0035] Figure 11 This is an embodiment of the present invention. Figure 10 Enlarged view at point C;

[0036] The attached figures are labeled as follows:

[0037] 1. Support body; 101. Winding; 102. Elastic washer; 103. Limiting block; 104. Rotating frame; 105. Screw; 106. Countersunk hole; 1061. Countersunk surface; 107. Moving space; 2. Rotating shaft; 3. Fixing component; 4. Moving component; 5. Groove; 501. First inner surface; 502. Second inner surface; 6. Protrusion; 601. First outer surface; 602. Second outer surface; 701. First friction plate; 702. Second friction plate; 801. First elastic element; 802. Second elastic element; 901. First ring plate; 902. Second ring plate; 903. Cylindrical plate. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0040] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0041] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0042] See also Figure 1-11 As shown, the present invention provides a brake for braking a rotating shaft 2, the brake comprising:

[0043] Support 1;

[0044] A first rotating body and a second rotating body, wherein the first rotating body is fixed on the rotating shaft 2, and the second rotating body is connected to the first rotating body under the action of extrusion force, the direction of the extrusion force being along the axial direction of the rotating shaft 2;

[0045] The braking part includes a fixing member 3 fixed on the support body 1 and a moving member 4 fixed on the second rotating body. The moving member 4 can move along the radial direction of the rotating shaft 2 to engage or disengage with the fixing member 3.

[0046] In this application, "axial" refers to the axial direction of the rotating shaft 2, "radial" refers to the radial direction of the rotating shaft 2, and "circumferential" refers to the circumferential direction of the rotating shaft 2.

[0047] In this application, the movable component 4 moves radially to connect and separate from the fixed component 3. Since the fixed component 3 is fixed to the support body 1 and the movable component 4 is fixed to the second rotating body, when the movable component 4 engages with the fixed component 3, the second rotating body stops rotating. The rotating shaft 2 drives the first rotating body to rotate, causing sliding friction between the first rotating body and the second rotating body, thereby braking the rotating shaft 2. Because the movable component 4 moves radially, the gap between the movable component 4 and the fixed component 3 is located between them in the radial direction. This reduces the axial dimension of the brake. When this brake is applied to a motor, it can reduce the axial dimension of the motor.

[0048] When not braking, the second rotating body and the first rotating body become a single unit due to the compressive force. When the rotating shaft 2 rotates, it drives the first and second rotating bodies to rotate simultaneously, increasing the rotational inertia of the rotating shaft 2. When the rotating shaft 2 is the rotating shaft 2 of a motor, it increases the rotational inertia of the motor, which can be a servo motor.

[0049] Preferred, such as Figure 8-11 As shown, the fixing member 3 is provided with a groove 5 with an opening facing the moving member 4, and the moving member 4 is provided with a protrusion 6 that can extend into the groove 5.

[0050] The moving part 4 and the fixed part 3 are engaged by the cooperation of the groove 5 and the protrusion 6. The structure is simple and the engagement is stable. Whether the rotating shaft 2 rotates forward or backward, the protrusion 6 can be engaged in the groove 5 to achieve the engagement between the moving part 4 and the fixed part 3, which improves the applicability of the braking component.

[0051] Preferred, such as Figure 8-11 As shown, an electromagnetic component is provided on the second rotating body, which can drive the moving part 4 to move.

[0052] By driving the moving part 4 with electromagnetic components, the moving part 4 can be driven more stably, thereby improving the stability of the brake operation.

[0053] The electromagnetic component is only used to drive the movement of the moving part 4, and does not directly generate friction between the first rotating body and the second rotating body. Therefore, the force exerted by the electromagnetic component on the moving part 4 is relatively small, which makes the electromagnetic component smaller in size. The electromagnetic force of the electromagnetic component is relatively small, and less electrical pure iron and copper wire are used to make the electromagnetic component, which helps to reduce costs.

[0054] Preferred, such as Figure 8-11As shown, the electromagnetic component includes an electromagnetic part and a first elastic member 801. When the electromagnetic part is energized, it can cause the movable member 4 to move away from the fixed member 3 and squeeze the first elastic member 801.

[0055] When the electromagnetic unit is energized, the moving part 4 moves away from the fixed part 3, thus separating the moving part 4 from the fixed part 3. At this time, the brake no longer brakes the rotating shaft 2 and presses against the first elastic member 801. When the electromagnetic unit is de-energized, the moving part 4 moves towards the fixed part 3 under the action of the first elastic member 801 and engages with the fixed part 3. In this way, when the motor is energized, the electromagnetic unit is also energized, and when the motor is de-energized, the electromagnetic unit is also de-energized, thereby achieving braking. This method makes the control of the brake simple and convenient.

[0056] The first elastic element 801 is a first spring. When the electromagnetic part is energized, the electromagnetic force acting on the moving part 4 only needs to overcome the first elastic element 801 to move the moving part 4. The electromagnetic force generated by the electromagnetic part can be very small, that is, the volume of the electromagnetic part can be very small, which is beneficial to reducing the size and weight of the brake. The first spring directly drives the movement of the moving part 4, rather than directly contributing to friction. The elastic coefficient of the first elastic element 801 is relatively small, and there is no need to use a highly elastic element in the first elastic element 801, which helps to reduce costs.

[0057] Preferred, such as Figure 7 As shown, at least two limiting blocks 103 are distributed on the second rotating body along the circumferential direction of the rotating shaft 2, and a sliding groove is formed between two adjacent limiting blocks 103, and the moving member 4 is disposed in the sliding groove.

[0058] The movable part 4 is set in the slide groove and slides in the radial direction. The limiting blocks 103 on both sides of the slide groove limit the movable part 4 in the circumferential direction. On the one hand, this allows the movable part 4 to move smoothly in the radial direction on the second rotating body. On the other hand, it improves the stability of the movable part 4 in the circumferential direction and avoids the movable part 4 from becoming unstable in the circumferential direction after being locked with the fixed part 3, thus preventing it from separating from the second rotating part and thus failing to drive the second rotating part to stop rotating.

[0059] Furthermore, in the radial direction, the winding 101 is opposite to the groove, which can prevent (or reduce) the magnetic circuit generated by the winding 101 from passing through the limiting block 103.

[0060] Furthermore, multiple movable parts 4 can be provided, evenly distributed along the circumferential direction, for example, four can be provided, and each movable part 4 can be provided with multiple protrusions 6, so that the force between the movable part 4 and the fixed part 3 is more balanced.

[0061] In the radial direction, the fixing member 3 is located on the outside of the moving member 4. The moving member 4 can be engaged with the fixing member 3 when it moves radially outward, and can be separated from the fixing member 3 when it moves radially inward.

[0062] Preferred, such as Figure 8-11 As shown, in the circumferential direction of the rotating shaft 2, the inner wall of the groove 5 includes a first inner side 501 and a second inner side 502 opposite to each other, and the outer wall of the protrusion 6 includes a first outer side 601 and a second outer side 602 opposite to each other.

[0063] On the projection of the rotating shaft 2 in the axial direction, a V-shaped groove with an opening facing away from the brake part is formed between the first inner side surface 501 and the second inner side surface 502; a conical structure is formed between the first outer side surface 601 and the second outer side surface 602, with the large end of the protrusion 6 facing the groove 5 and the small end of the protrusion 6 facing away from the groove 5.

[0064] By setting the groove 5 as a V-shaped groove with its opening facing away from the brake part, and setting the protrusion 6 as a conical structure with its large end facing the groove 5, when the protrusion 6 is inserted into the groove 5 and contacts the inner side of the groove 5, when the rotating shaft 2 rotates in the forward or reverse direction, at the contact position, the force exerted by the inner side on the outer side will necessarily have a component force facing away from the brake part. This component force makes the protrusion 6 tend to extend into the groove 5, thereby improving the stability of the protrusion 6 being inserted into the groove 5.

[0065] Furthermore, the angle between the first inner surface 501 and the second inner surface 502 is approximately 3°, and the angle between the first outer surface 601 and the second outer surface 602 is also V-shaped, with an angle of approximately 2°. In the circumferential direction, the minimum distance between the first inner surface 501 and the second inner surface 502 is greater than the maximum distance between the first outer surface 601 and the second outer surface 602.

[0066] Preferred, such as Figure 1-3 As shown, the second rotating body includes a cylindrical plate 903, a first ring plate 901 and a second ring plate 902 spaced apart along the axial direction of the rotating shaft 2, the second ring plate 902 is fixedly connected to one end of the cylindrical plate 903, and the first ring plate 901 is detachably connected to the other end of the cylindrical plate 903 by screws 105. The second rotating body also includes a first friction plate 701 fixed on the first ring plate 901.

[0067] The first rotating body includes a rotating frame 104, which is fixed on the rotating shaft 2. The rotating frame 104 includes a friction part, and the friction part and the first friction plate 701 are disposed between the first ring plate 901 and the second ring plate 902. A moving space 107 is provided between the first ring plate 901 and the cylindrical plate 903. The first friction plate 701 is pressed together with the friction part.

[0068] The rotating frame 104 rotates with the rotating shaft 2. The rotating frame 104 is frictionally connected to the first friction plate 701 via its own friction part. When the moving part 4 is engaged with the fixed part 3, the second rotating part stops rotating, and the first friction plate 701 fixed on the first ring plate 901 no longer rotates. Under the action of inertia, the rotating frame 104 continues to rotate with the rotating shaft 2. Sliding friction occurs between the friction part of the rotating frame 104 and the first friction plate 701, thereby achieving braking of the rotating shaft 2. By forming a moving space 107 between the first ring plate 901 and the cylindrical plate 903, the first ring plate 901 can press the first friction plate 701 and the friction part together, creating a certain compressive force between them.

[0069] Furthermore, the rotating frame 104 is a wheel hub.

[0070] The first friction plate 701 is always in contact with the friction part, so there is no need to control the gap between them.

[0071] Furthermore, the cylindrical plate 903 and the second ring plate 902 can be configured as an integral structure as the iron core, and the winding 101 of the electromagnetic part is directly set on the iron core, without the need for a special coil frame. The iron core, as part of the magnetic circuit of the magnetic field generated by the winding 101, is conducive to improving the integration of the brake and reducing costs.

[0072] Preferred, such as Figure 3 As shown, an elastic washer 102 is provided between the nut of the screw 105 and the first ring plate 901.

[0073] During the mutual friction between the first friction plate 701 and the friction part, the dimensions of the first friction plate 701 and the friction part will decrease in the axial direction (wear and thinning). Since an elastic washer 102 is provided between the nut of the screw 105 and the first ring plate 901, the elastic washer 102 has at least two functions. One function is to prevent the screw 105 from loosening and avoid the screw 105 from loosening from the cylindrical plate 903. The other function is to store elastic potential energy. When the dimensions of the first friction plate 701 and the friction part decrease, since a moving space 107 is provided between the cylindrical plate 903 and the first ring plate 901, the elastic washer 102 pushes the first ring plate 901 toward the second ring plate 902 (the moving space 107 decreases), so that the first ring plate 901 can provide a certain compressive force between the first friction plate 701 and the friction part, thereby ensuring that the first friction plate 701 and the friction part always have a certain compressive force.

[0074] Furthermore, screw 105 is also equipped with a flat washer. Screw 105 is threaded onto cylindrical plate 903 through the flat washer and elastic washer 102.

[0075] Preferred, such as Figure 4 As shown, the first ring plate 901 is provided with a countersunk hole 106 for the screw 105 to pass through. The countersunk hole 106 includes a countersunk surface 1061 facing the nut of the screw. A second elastic member 802 that is compressed is provided between the countersunk surface 1061 and the nut.

[0076] The countersunk hole 106 is a plane inside the countersunk hole 106, which is perpendicular to the axis of the countersunk hole 106.

[0077] By providing a second elastic element 802 between the countersunk surface 1061 and the nut, and since the screw 105 is threaded onto the cylindrical plate 903, the second elastic element 802 has an elastic force that causes the first ring plate 901 to move toward the cylindrical plate 903. Combined with the provision of the moving space 107, the second elastic element 802 ensures that the first friction plate 701 always maintains a certain compressive force with the friction part. The countersunk hole 106 also allows the nut to sink into the countersunk hole 106, thereby ensuring that there are no protrusions on the side of the first ring plate 901. This is beneficial for further reducing the axial dimension of the brake, and thus reducing the length of the motor.

[0078] The second elastic element 802 is preferably a second spring.

[0079] The elastic force acting on the first ring plate 901 can be the elastic pad 102, the second elastic element 802, or both. Since the relative rotation between the first friction plate 701 and the friction part resulting in sliding friction is independent of the magnitude of the electromagnetic force (but related to the presence or absence of electromagnetic force), and the magnitude of the compressive force between the first friction plate 701 and the friction part is related to the elastic pad 102 and the second elastic element 802, the voltage on the electromagnetic part of this application can remain constant (the voltage is constant when the electromagnetic part is energized).

[0080] Preferred, such as Figure 1-3 As shown, the first rotating body also includes a second friction plate 702, which is fixedly disposed on the second ring plate 902 and is pressed and connected to the friction part.

[0081] By fixing the second friction plate 702 on the second ring plate 902, the two friction plates squeeze the friction part in the middle, thereby realizing double-sided friction of the friction part, which not only increases the friction area, but also makes the friction part balanced in the axial direction, ensuring the stability of the extrusion force between the friction part and the friction plate.

[0082] The present invention provides an electric motor, including a rotating shaft 2, a housing and the aforementioned brake, wherein the first rotating body is fixed on the rotating shaft 2 and the support body 1 is the rear end cover of the electric motor.

[0083] With the aforementioned brake installed, the overall size of the motor is reduced, and the axial dimension of the shaft 2 is also reduced.

[0084] Furthermore, the motor is a servo motor. Because the electromagnetic part of the brake requires a smaller voltage and generates a smaller electromagnetic force, the magnetic field generated when the brake is energized is weaker. This results in less magnetic leakage from the brake, and the minimal magnetic leakage has a smaller impact on the servo motor's shaft 2, bearings, and magnetic encoder, which is beneficial for improving the performance of the servo motor.

[0085] Specifically, when the motor brakes or is de-energized, the electromagnetic component is de-energized, and the moving part 4 is no longer subject to electromagnetic attraction. Under the action of the first elastic member 801, the moving part 4 moves toward the fixed member 3. When the protrusion 6 on the moving part 4 is engaged in the groove 5, the moving part 4 stops rotating because it is engaged with the groove 5 on the fixed member 3. Since the moving part 4 is also blocked by the limiting block 103 on the second rotating part, the moving part 4 does not rotate relative to the second rotating part. That is, the second rotating part stops rotating along with the moving part 4. Under the action of the second elastic member 802 and the elastic pad 102, the first ring plate 901 on the second rotating part causes the first friction plate 701 fixed on the first ring plate 901 to exert a pressing force on the friction part of the rotating part on the first rotating part. The first rotating part rotates with the rotating shaft 2, causing friction between the first friction plate 701 and the friction part, thereby achieving braking of the rotating shaft 2.

[0086] When the motor brakes, the electromagnetic component is energized, generating a magnetic attraction force, which causes the moving part 4 to move away from the fixed part 3 and squeeze the first elastic part. When the protrusion 6 on the moving part 4 separates from the groove 5, the first rotating body and the second rotating body rotate as a whole with the rotating shaft 2.

[0087] Brake assembly process:

[0088] Step 1: The winding 101 is wound on the iron core with constant tension. The winding 101 and the iron core are isolated by an imide film to prevent current leakage. After the winding is completed, it is potted with epoxy resin.

[0089] Step two: The two friction plates are glued to the first ring plate 901 and the second ring plate 902. The cylindrical plate 903 is fixed to the first ring plate 901 with screws 105. The first ring plate 901 and the second ring plate 902 can clamp the hub, allowing the second rotating component to rotate synchronously with the first rotating component when the motor is not braking. Screws 105 are equipped with flat washers and spring washers. The pressure between the friction plates and the hub is provided by screws 105, and the torque of screws 105 needs to be controlled with a torque wrench. Generally, a gap of about 0.2mm is required between the first ring plate 901 and the cylindrical plate 903 to prevent insufficient thickness of the friction plates and hub due to processing errors, which would prevent the pressure of the first ring plate 901 from being unable to be transmitted to the friction plates. It also provides space for the friction plates to maintain pressure with the friction part and increase movement even after wear.

[0090] Step 3: The first rotating body and the second rotating body are pressed into the rotating shaft 2 as a component by cold pressing. The first rotating body (hub) and the rotating shaft 2 are interference fit.

[0091] Step 4: The fastener 3 and the rear end cover are interference fit. The fastener 3 is pressed into the rear end cover by cold pressing.

[0092] Step 5: Install four first springs radially between the first end piece and the second rotating body. The first springs have low elasticity, and the number of first springs can be increased as needed. Energize the winding 101, and the moving part 4 can move radially inward. The rear end cover and the fixing part 3 are installed as a component on the motor body, thus completing the assembly.

[0093] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0094] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A brake for braking a rotating shaft (2), characterized in that, The brake includes: Support (1); A first rotating body and a second rotating body, the first rotating body is fixed on the rotating shaft (2), and the second rotating body is connected to the first rotating body under the action of extrusion force, the direction of the extrusion force is along the axial direction of the rotating shaft (2); The braking part includes a fixing member (3) fixed on the support body (1) and a moving member (4) fixed on the second rotating body. The moving member (4) can move along the radial direction of the rotating shaft (2) and engage or disengage with the fixing member (3). When the movable part (4) is engaged with the fixed part (3), the second rotating body stops rotating and slides against the first rotating body; when the movable part (4) separates from the fixed part (3) and the first rotating body rotates, the second rotating body rotates together with the first rotating body. The fixing member (3) is provided with a groove (5) with an opening facing the moving member (4), and the moving member (4) is provided with a protrusion (6) that can extend into the groove (5). An electromagnetic component is provided on the second rotating body, and the electromagnetic component can drive the moving member (4) to move radially along the second rotating body. At least two limiting blocks (103) are distributed on the second rotating body along the circumferential direction of the rotating shaft (2), and a sliding groove is formed between two adjacent limiting blocks (103). The moving member (4) is disposed in the sliding groove.

2. The brake according to claim 1, characterized in that, The electromagnetic component includes an electromagnetic part and a first elastic element (801). When the electromagnetic part is energized, it can cause the movable part (4) to move away from the fixed part (3) and squeeze the first elastic element (801).

3. The brake according to claim 1, characterized in that, In the circumferential direction of the rotating shaft (2), the inner wall of the groove (5) includes a first inner side surface (501) and a second inner side surface (502) opposite to each other, and the outer wall surface of the protrusion (6) includes a first outer side surface (601) and a second outer side surface (602) opposite to each other. On the projection of the rotating shaft (2) in the axial direction, a V-shaped groove with an opening facing away from the brake part is formed between the first inner side surface (501) and the second inner side surface (502); a conical structure is formed between the first outer side surface (601) and the second outer side surface (602), with the large end of the protrusion (6) facing the groove (5) and the small end of the protrusion (6) facing away from the groove (5).

4. The brake according to any one of claims 1-3, characterized in that, The second rotating body includes a cylindrical plate (903), a first ring plate (901) and a second ring plate (902) spaced apart along the axial direction of the rotating shaft (2). The second ring plate (902) is fixedly connected to one end of the cylindrical plate (903), and the first ring plate (901) is detachably connected to the other end of the cylindrical plate (903) by screws (105). The second rotating body also includes a first friction plate (701) fixed on the first ring plate (901). The first rotating body includes a rotating frame (104), which is fixed on the rotating shaft (2). The rotating frame (104) includes a friction part, and the friction part and the first friction plate (701) are disposed between the first ring plate (901) and the second ring plate (902). A moving space (107) is provided between the first ring plate (901) and the cylindrical plate (903). The first friction plate (701) is pressed together with the friction part.

5. The brake according to claim 4, characterized in that, An elastic washer (102) is provided between the nut of the screw (105) and the first ring plate (901).

6. The brake according to claim 5, characterized in that, The first ring plate (901) is provided with a countersunk hole (106) for the screw (105) to pass through. The countersunk hole (106) includes a countersunk surface (1061) facing the nut. A compressed second elastic element (802) is provided between the countersunk surface (1061) and the nut.

7. The brake according to claim 4, characterized in that, The first rotating body also includes a second friction plate (702), which is fixedly disposed on the second ring plate (902) and is pressed and connected to the friction part.

8. An electric motor, characterized in that, It includes a rotating shaft (2), a housing, and a brake as described in any one of claims 1-7, wherein the first rotating body is fixed on the rotating shaft (2), and the support body (1) is the rear end cover of the motor.

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