Brake and motor

Abstract

The invention provides a brake and a motor. The brake comprises a support body; the first rotating body is fixed on the rotating shaft, the second rotating body is connected with the first rotating body under the action of extrusion force, and the direction of the extrusion force is in the axial direction of the rotating shaft; the braking part comprises a fixed part fixed to the supporting body and a movable part fixed to the second rotating body, and the movable part moves in the radial direction of the rotating shaft and can be connected with or separated from the fixed part in a clamped mode, so that the overall size of the electromagnetic driving assembly can be reduced; and the axial size of the brake can be reduced.

Description

Technical Field

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

[0002] The electromagnetic brake is an important basic component that switches the brake holding and brake opening states between power on and power off. It is mainly used for safe braking of rotating mechanisms (such as motor devices, etc.). Currently, servo motors mainly use electromagnetic power-off brakes to ensure that the shaft does not move after power off.

[0003] Traditional brakes achieve braking through the pressure generated by the spring force on the friction plate. The electromagnetic force generated by the winding is greater than the spring force to release the pressure on the friction plate, thereby achieving a non-braking state. The braking force of traditional brakes is the spring force. Since the spring force is limited and the increase in spring force will inevitably increase the corresponding electromagnetic force of the winding, the spring of traditional brakes generally has a large elastic force and a large electromagnetic component.

[0004] In order to reduce the electromagnetic component, the patent with application number 202411340014 discloses a braking device and a motor. During braking, the electromagnetic drive component only needs to convert 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 rotating component and the second rotating component, that is, the magnitude of the elastic force of the first elastic member, rather than the force of the electromagnetic drive component driving the anti-rotation component. This makes the electromagnetic drive component only need a small power consumption to achieve braking of the rotating shaft, reducing the power consumption of the electromagnetic drive component. The magnetic field intensity generated by the electromagnetic drive is small. When the braking device is applied to the motor, the electromagnetic interference generated to the motor is also small. The force generated by the electromagnetic drive component is relatively small, so a large volume is not required, which is conducive to reducing space occupancy and reducing the weight of the braking device. The anti-rotation component in the patent moves along the axial direction of the rotating shaft, the stop component and the second rotating component are distributed along the axial direction, and there is a certain interval between the stop component and the second rotating component. The axial square dimension of the braking device is large, which also makes the axial dimension of the motor on which the braking device is set large.

[0005] How to reduce the axial size of the brake device while ensuring the volume of the electromagnetic drive component, and thus reduce the axial size 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, which can reduce the overall volume of the electromagnetic drive assembly and the axial size of the brake.

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

[0008] Support body;

[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 a squeezing force, and the direction of the squeezing force is along the axial direction of the rotating shaft;

[0010] The braking part includes a fixing member fixed on the supporting body and a moving member fixed on the second rotating body, and the moving member can be engaged with or separated from the fixing member by moving along the radial direction of the rotating shaft.

[0011] In some embodiments, the fixing member is provided with a groove opening toward the moving member, and the moving member is provided with a protrusion capable of extending into the groove.

[0012] In some embodiments, an electromagnetic component is disposed on the second rotating body, and the electromagnetic component can drive the moving member to move.

[0013] In some embodiments, the electromagnetic assembly includes an electromagnetic part and a first elastic member. When the electromagnetic part is energized, it can cause the movable member to move in a direction away from the fixed member and squeeze the first elastic member.

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

[0015] In some embodiments, in the circumferential direction of the rotating shaft, the inner wall of the groove includes a first inner side surface and a second inner side surface opposite to each other, and the outer wall surface of the protrusion includes a first outer side surface and a second outer side surface opposite to each other;

[0016] In the projection in the axial direction of the rotating shaft, a V-shaped groove with an opening facing away from the braking portion is formed between the first inner side surface and the second inner side surface; a conical structure is formed between the first outer side surface and the second outer side surface, 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 is fixedly connected to one end of the cylindrical plate, the first ring plate is detachably connected to the other end of the cylindrical plate via screws, and the second rotating body further 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. The friction part and the first friction plate are arranged between the first ring plate and the second ring plate. A moving space is arranged between the first ring plate and the cylindrical plate. The first friction plate and the friction part are squeezed together.

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

[0020] In some embodiments, a countersunk hole for passing the screw is provided on the first ring plate, the countersunk hole includes a countersunk surface facing the nut, and a squeezed second elastic member 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, the second friction plate is fixedly disposed on the second ring plate, and the second friction plate is extrusion-connected to the friction portion.

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

[0023] The brake part of the present invention comprises a fixing member fixed on a supporting body and a moving member fixed on a second rotating body. The moving member can be engaged with or separated from the fixing member by moving along the radial direction of the rotating shaft, thereby reducing the size of the brake in the axial direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

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

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

[0027] Figure 3 The embodiment of the present invention Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 The embodiment of the present invention Figure 3 Schematic diagram when the screw hole in is a countersunk hole;

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

[0030] Figure 6 The embodiment of the present invention Figure 5 Right view;

[0031] Figure 7 The embodiment of the present invention Figure 5 Left view;

[0032] Figure 8 is a schematic diagram of a movable part and a fixed part in an embodiment of the present invention when they are engaged with each other;

[0033] Fig. 9 The embodiment of the present invention Figure 8 Enlarged view of point B in the middle;

[0034] Fig.10 is a schematic diagram of a moving part and a fixed part of an embodiment of the present invention when they are separated;

[0035] Fig.11 The embodiment of the present invention Fig.10 Enlarged view of point C in the middle;

[0036] The accompanying drawings are marked as follows:

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

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

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

[0041] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

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

[0043] Support body 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 a squeezing force, and the direction of the squeezing force is along the axial direction of the rotating shaft 2;

[0045] The braking part includes a fixing member 3 fixed on the supporting 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 be engaged with or separated from the fixing member 3.

[0046] The “axial direction” in the present application refers to the axial direction of the rotating shaft 2 , the “radial direction” refers to the radial direction of the rotating shaft 2 , and the “circumferential direction” refers to the circumferential direction of the rotating shaft 2 .

[0047] The moving member 4 of the present application moves along the radial direction to achieve connection and separation with the fixed member 3. Since the fixed member 3 is fixed on the support body 1 and the moving member 4 is fixed on the second rotating body, when the moving member 4 is engaged with the fixed member 3, the second rotating body stops rotating, and the rotating shaft 2 drives the first rotating body to rotate so that the first rotating body and the second rotating body have sliding friction, thereby achieving braking of the rotating shaft 2. Since the moving member 4 moves along the radial direction, the interval between the moving member 4 and the fixed member 3 is located between the two in the radial direction, which reduces the size of the brake in the axial direction. When the brake is applied to a motor, it can reduce the size of the motor in the axial direction.

[0048] When not braking, the second rotating body and the first rotating body become a whole by the squeezing force, and the rotation of the shaft 2 drives the first rotating body and the second rotating body to rotate simultaneously, thereby increasing the rotational inertia of the shaft 2. When the shaft 2 is the shaft 2 of the motor, the rotational inertia of the motor is increased, and the motor can be a servo motor.

[0049] Preferably, Figure 8-11 As shown, the fixing member 3 is provided with a groove 5 opening toward the moving member 4 , and the moving member 4 is provided with a protrusion 6 capable of extending into the groove 5 .

[0050] The movable part 4 and the fixed part 3 are snapped together by the cooperation between the groove 5 and the protrusion 6, which has a simple structure and stable snapping. Whether the rotating shaft 2 rotates forward or reverse, the protrusion 6 can be snapped into the groove 5 to realize the snapping between the movable part 4 and the fixed part 3, thereby improving the applicability of the brake part.

[0051] Preferably, Figure 8-11 As shown, an electromagnetic component is disposed on the second rotating body, and the electromagnetic component can drive the moving member 4 to move.

[0052] By driving the moving member 4 to move through the electromagnetic assembly, the moving member 4 can be driven more stably, thereby improving the stability of the brake operation.

[0053] The electromagnetic assembly is only used to drive the movement of the moving member 4, and does not directly generate friction between the first rotating body and the second rotating body. Therefore, the electromagnetic assembly generates a smaller force on the moving member 4, which makes the electromagnetic assembly smaller. The electromagnetic force of the electromagnetic assembly is smaller, and the use of electrical pure iron and copper wire constituting the electromagnetic assembly is also less, which is conducive to reducing costs.

[0054] Preferably, Figure 8-11As shown, the electromagnetic assembly includes an electromagnetic part and a first elastic member 801 . When the electromagnetic part is energized, it can make the moving member 4 move in a direction away from the fixed member 3 and squeeze the first elastic member 801 .

[0055] When the electromagnetic part is powered on, the moving part 4 moves in a direction away from the fixed part 3, that is, the moving part 4 is separated from the fixed part 3. At this time, the brake no longer brakes the rotating shaft 2 and squeezes the first elastic part 801. When the electromagnetic part is powered off, the moving part 4 moves toward the fixed part 3 under the action of the first elastic part 801 and achieves a clamping connection with the fixed part 3. In this way, when the motor is powered on, the electromagnetic part is also powered on. When the motor is powered off, the electromagnetic part is also powered off, thereby achieving braking. In this way, the control of the brake is simple and convenient.

[0056] The first elastic member 801 is a first spring, and the electromagnetic part is energized to act as an electromagnetic force on the movable member 4, and only needs to overcome the first elastic member 801 to move the movable member 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 conducive to reducing the volume and weight of the brake. The effect of the first spring is directly used to drive the movement of the movable member 4, rather than being directly used for friction. The elastic coefficient of the first elastic member 801 is small, and the first elastic member 801 does not need to use a high elastic element, which is conducive to reducing costs.

[0057] Preferably, Figure 7 As shown, at least two limit blocks 103 are distributed on the second rotating body along the circumferential direction of the rotating shaft 2, and a slide groove is formed between two adjacent limit blocks 103, and the moving member 4 is arranged in the slide groove.

[0058] The movable member 4 is arranged in the slide groove to slide along the radial direction, and the limit blocks 103 on both sides of the slide groove form a circumferential limit for the movable member 4. On the one hand, the movable member 4 can move smoothly on the second rotating body along the radial direction; on the other hand, the stability of the movable member 4 in the circumferential direction is improved, so as to avoid the movable member 4 being unstable in the circumferential limit direction after being clamped together with the fixed member 3 and being separated from the second rotating member, thereby making it impossible to stop the rotation of the second rotating member.

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

[0060] Furthermore, a plurality of movable members 4 may be provided, and they are evenly arranged along the circumferential direction. For example, four movable members 4 may be provided, and each movable member 4 may be provided with a plurality of protrusions 6 so that the force between the movable member 4 and the fixed member 3 is more balanced.

[0061] In the radial direction, the fixing member 3 is arranged outside the moving member 4 . The moving member 4 can be engaged with the fixing member 3 by moving radially outward, and can be separated from the fixing member 3 by moving radially inward.

[0062] Preferably, 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 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;

[0063] In the axial projection of the rotating shaft 2, a V-shaped groove with an opening facing away from the braking portion 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, the large end of the protrusion 6 faces the groove 5, and the small end of the protrusion 6 faces away from the groove 5.

[0064] By configuring the groove 5 to be a V-shaped groove with its opening facing away from the braking portion, and configuring the protrusion 6 to be 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 surface of the groove 5, when the shaft 2 rotates forward or reversely, in the contact position, the force exerted by the inner side surface on the outer side surface must have a component force facing away from the braking portion, and 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 side surface 501 and the second inner side surface 502 is about 3°, and the first outer side surface 601 and the second outer side surface 602 are also V-shaped, and the angle is about 2°. In the circumferential direction, the minimum distance between the first inner side surface 501 and the second inner side surface 502 is greater than the maximum distance between the first outer side surface and the second outer side surface 602.

[0066] Preferably, 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, the first ring plate 901 is detachably connected to the other end of the cylindrical plate 903 via screws 105, and the second rotating body also includes a first friction plate 701 fixed to 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 portion, and the friction portion and the first friction plate 701 are arranged between the first ring plate 901 and the second ring plate 902. A moving space 107 is arranged between the first ring plate 901 and the cylindrical plate 903, and the first friction plate 701 is squeezed together with the friction portion.

[0068] The rotating frame 104 rotates with the rotating shaft 2, and the rotating frame 104 is frictionally connected with the first friction plate 701 through its own friction part. When the moving member 4 is engaged with the fixed member 3, the second rotating member stops rotating, and the first friction plate 701 fixed on the first ring plate 901 stops rotating. Under the action of inertia, the rotating frame 104 continues to rotate with the rotating shaft 2, and 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 squeeze the first friction plate 701 and the friction part together, so that there is a certain squeezing force between the first friction plate 701 and the friction part.

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

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

[0071] Furthermore, the cylindrical plate 903 and the second ring plate 902 can be set as an integrated structure as an 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 serves as a part of the magnetic circuit of the magnetic field generated by the winding 101, which is conducive to improving the integration of the brake and reducing costs.

[0072] Preferably, Figure 3 As shown, an elastic gasket 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 size of the first friction plate 701 and the friction part will decrease in the axial direction (wear and thinning); since an elastic gasket 102 is provided between the nut of the screw 105 and the first ring plate 901, the elastic gasket 102 has at least two functions, one of which is to prevent the screw 105 from loosening and prevent the screw 105 from loosening from the cylindrical plate 903; the other function is to store elastic potential energy. When the size of the first friction plate 701 and the friction part decreases, since a moving space 107 is provided between the cylindrical plate 903 and the first ring plate 901, the elastic gasket 102 pushes the first ring plate 901 to move toward the second ring plate 902 (the moving space 107 decreases), so that the first ring plate 901 can provide a certain extrusion force between the first friction plate 701 and the friction part, thereby ensuring that a certain extrusion force is always provided between the first friction plate 701 and the friction part.

[0074] Furthermore, the screw 105 is also equipped with a flat washer. The screw 105 passes through the flat washer and the elastic washer 102 and is threadedly connected to the cylindrical plate 903.

[0075] Preferably, Figure 4 As shown, the first ring plate 901 is provided with a countersunk hole 106 for passing the screw 105, the countersunk hole 106 includes a countersunk surface 1061 facing the nut of the screw, and a squeezed second elastic member 802 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 arranging the second elastic member 802 between the countersunk surface 1061 and the nut, since the screw 105 is threadedly connected to the cylindrical plate 903, the second elastic member 802 has an elastic force to move the first ring plate 901 toward the cylindrical plate 903. Combined with the setting of the moving space 107, the second elastic member 802 can always ensure that there is a certain squeezing force between the first friction plate 701 and the friction part. The setting of the countersunk hole 106 can also make the nut sink into the countersunk hole 106, thereby ensuring that there is no protrusion on the side of the first ring plate 901, which is conducive to further reducing the size of the brake in the axial direction, thereby reducing the length of the motor.

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

[0079] The elastic force acting on the first ring plate 901 can be the elastic gasket 102, the second elastic member 802, or both. Since whether the first friction plate 701 and the friction part rotate relative to each other to generate sliding friction has nothing to do with the magnitude of the electromagnetic force (and is related to whether there is an electromagnetic force), the magnitude of the extrusion force between the first friction plate 701 and the friction part is related to the elastic gasket 102 and the second elastic member 802, so the voltage on the electromagnetic part of the present application can be kept constant (when the electromagnetic part is powered on, the voltage is constant).

[0080] Preferably, Figure 1-3 As shown, the first rotating body further includes a second friction plate 702 , and the second friction plate 702 is fixedly disposed on the second ring plate 902 , and the second friction plate 702 is extruded and connected to the friction portion.

[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 achieving double-sided friction of the friction part, which not only increases the friction area, but also balances the force on the friction part in the axial direction, ensuring the stability of the extrusion force between the friction part and the friction plate.

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

[0083] The motor provided with the above-mentioned brake has a reduced overall size of the motor and a reduced size of the rotating shaft 2 in the axial direction.

[0084] Furthermore, the motor is a servo motor. Since the electromagnetic part of the brake requires a smaller voltage and generates a smaller electromagnetic force, the magnetic field generated when the brake is powered on is weaker, which results in less magnetic flux leakage from the brake, and the minimal magnetic flux leakage has less impact on the rotating shaft 2, bearings and magnetic encoder of the servo motor, which is beneficial to improving the performance of the servo motor.

[0085] Specifically, when the motor is braked or powered off, the electromagnetic assembly is powered off, and the moving member 4 is no longer subjected to the electromagnetic attraction. The moving member 4 moves toward the fixed member 3 under the action of the first elastic member 801. When the protrusion 6 on the moving member 4 is inserted into the groove 5, the moving member 4 stops rotating because the groove 5 on the fixed member 3 is engaged with the moving member 4. Since the moving member 4 is also blocked by the limit block 103 on the second rotating member, the moving member 4 will not rotate relative to the second rotating member, that is, the second rotating member stops rotating following the moving member 4. Because the first ring plate 901 on the second rotating member causes the first friction plate 701 fixed on the first ring plate 901 to generate an extrusion force with the friction part of the rotating member on the first rotating member under the action of the second elastic member 802 and the elastic gasket 102, the first rotating member rotates following the rotating shaft 2, so that friction occurs 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 to generate magnetic attraction, causing 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 following 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 2: The two friction plates are fixed together with the first ring plate 901 and the second ring plate 902 by gluing, and the cylindrical plate 903 is fixed together with the first ring plate 901 by screws 105. The first ring plate 901 and the second ring plate 902 can clamp the wheel hub, so that the second rotating part can rotate synchronously with the first rotating part when the motor is in a non-braking state. The screw 105 is equipped with a flat washer and a spring washer. The pressure between the friction plate and the wheel hub is provided by the screw 105, and the screw 105 needs to use a torque wrench to control the torque. In general, it is required that there is a gap of about 0.2mm between the first ring plate 901 and the cylindrical plate 903 to prevent the friction plate and the wheel hub from being insufficiently thick due to processing errors, so that the pressure of the first ring plate 901 cannot be transmitted to the friction plate, and at the same time, it also provides the friction plate with a space to maintain the extrusion force with the friction part and increase the movement after wear.

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

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

[0092] Step 5: Four first springs are installed between the first end piece and the second rotating body along the radial direction. The first springs have a relatively small elasticity and the number of first springs can be increased as required. The winding 101 is energized, and the moving piece 4 can move radially inward; the rear end cover and the fixing piece 3 are installed on the motor body as a component, and the assembly is completed.

[0093] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0094] The above description is only 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 principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A brake for braking a rotating shaft (2), characterized in that: The brake comprises: Support body (1); a first rotating body and a second rotating body, the first rotating body being fixed on the rotating shaft (2), the second rotating body being connected to the first rotating body under the action of a squeezing force, the direction of the squeezing force being along the axial direction of the rotating shaft (2); A braking part, the braking part comprises a fixing member (3) fixed on the supporting body (1) and a moving member (4) fixed on the second rotating body, wherein the moving member (4) can be engaged with or separated from the fixing member (3) by moving along the radial direction of the rotating shaft (2).

2. The brake according to claim 1, characterized in that The fixing member (3) is provided with a groove (5) opening toward the moving member (4), and the moving member (4) is provided with a protrusion (6) capable of extending into the groove (5).

3. The brake according to claim 2, characterized in that The second rotating body is provided with an electromagnetic component, and the electromagnetic component can drive the moving member (4) to move.

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

5. The brake according to claim 4, characterized in that At least two limit blocks (103) are distributed on the second rotating body along the circumferential direction of the rotating shaft (2), and a slide groove is formed between two adjacent limit blocks (103), and the moving member (4) is arranged in the slide groove.

6. The brake according to claim 2, characterized in that In the circumferential direction of the rotating shaft (2), the inner wall of the groove (5) comprises a first inner side surface (501) and a second inner side surface (502) which are opposite to each other, and the outer wall surface of the protrusion (6) comprises a first outer side surface (601) and a second outer side surface (602) which are opposite to each other; In the projection of the shaft (2) in the axial direction, a V-shaped groove with an opening facing away from the braking portion 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), the large end of the protrusion (6) faces the groove (5), and the small end of the protrusion (6) faces away from the groove (5).

7. The brake according to any one of claims 1 to 6, characterized in that: The second rotating body comprises 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) being fixedly connected to one end of the cylindrical plate (903), the first ring plate (901) being detachably connected to the other end of the cylindrical plate (903) via a screw (105), and the second rotating body further comprises a first friction plate (701) fixed to the first ring plate (901); The first rotating body includes a rotating frame (104), the rotating frame (104) is fixed on the rotating shaft (2), the rotating frame (104) includes a friction portion, the friction portion and the first friction plate (701) are arranged between the first ring plate (901) and the second ring plate (902), a moving space (107) is arranged between the first ring plate (901) and the cylindrical plate (903), and the first friction plate (701) and the friction portion are squeezed together.

8. The brake according to claim 7, characterized in that An elastic gasket (102) is provided between the nut of the screw (105) and the first ring plate (901).

9. The brake according to claim 7, characterized in that The first ring plate (901) is provided with a countersunk hole (106) for passing the screw (105), the countersunk hole (106) includes a countersunk surface (1061) facing the nut, and a squeezed second elastic member (802) is provided between the countersunk surface (1061) and the nut.

10. The brake according to claim 7, characterized in that The first rotating body further comprises a second friction plate (702), wherein the second friction plate (702) is fixedly arranged on the second ring plate (902), and the second friction plate (702) is extrusion-connected to the friction portion.

11. A motor, characterized in that: It comprises a rotating shaft (2), a housing and the brake according to any one of claims 1 to 10, wherein the first rotating body is fixed on the rotating shaft (2), and the supporting body (1) is the rear end cover of the motor.

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