Brake caliper

Abstract

A brake caliper, comprising an actuator and a locking mechanism, the actuator including a first motor and a first transmission mechanism, the locking mechanism including a second motor (6) and a second transmission mechanism connected to the second motor and having a self-locking function, a power output member (3) of the second transmission mechanism meshing with one transmission gear (1) on the power transmission path of the first transmission mechanism in the locked state. This brake caliper has a locking function and can release the brake disc in a timely manner even when the first motor and its control-related members fail, avoiding continuous wheel locking during vehicle travel.

Description

Technical Field

[0001] The present invention belongs to the technical field of brake systems, and specifically relates to a brake caliper.

Background Art

[0002] EMB (electronic mechanical brake) directly drives using a wheel end motor to realize the braking function and release function during driving. Usually, it is necessary to add a locking mechanism to realize the parking function.

[0003] During braking, if the main motor or control circuit of a single caliper suddenly fails, since there is resistance in the transmission mechanism itself, the pressure between the brake pad and the brake disc is not completely released, and a residual clamping force remains between the brake pad and the brake disc. And due to this residual clamping force, the brake caliper is in a clamped state, excessive rolling resistance is generated in at least one of the four wheels of the vehicle, the vehicle cannot run safely, and the requirements for automated driving at L3 level or above cannot be met.

[0004] Also, in the conventional EMB technology, the locking mechanism only has the parking function and does not have the function of releasing the residual clamping force.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention is made to solve at least one of the technical problems of the conventional technology. The object of the present invention is to provide a brake caliper that can achieve reliable locking and release the brake disc in a timely manner.

[0006] To achieve the above object, the present invention employs the following technical means. A brake caliper includes an actuator and a locking mechanism. The actuator includes a first motor and a first transmission mechanism. The locking mechanism includes a second motor and a second transmission mechanism connected to the second motor and having a self-locking function. The power output member of the second transmission mechanism has a plurality of convex teeth that mesh with one of the transmission gears on the power transmission path of the first transmission mechanism in the locked state.

[0007] The power output member of the second transmission mechanism is a semi-closed gear. The semi-closed gear is provided with a toothed area where the convex teeth are uniformly arranged and a toothless area where the convex teeth are not arranged, respectively.

[0008] The second transmission mechanism includes a worm connected to the second motor, and the worm meshes with the power output member.

[0009] The second transmission mechanism includes a worm connected to the second motor and a worm wheel meshing with the worm. The worm wheel is connected to the power output member.

[0010] The brake caliper further includes a positioning mechanism for determining the initial position of the power output member.

[0011] The positioning mechanism includes a position regulating pin provided on the power output member and a position regulating elastic piece fitted with the position regulating pin. The position regulating elastic piece is provided with a positioning groove for fitting the position regulating pin when the power output member is in the initial position.

[0012] The brake caliper further includes a gear housing. The gear housing is provided with a guide groove for fitting the position regulating pin, and the position regulating elastic piece is located in the guide groove.

[0013] The position regulating pin is movably provided on the power output member, and the power output member is provided with a mounting hole for accommodating the position regulating pin. An elastic element for applying an elastic force to the position regulating pin is provided in the mounting hole.

[0014] The power output member of the second transmission mechanism is a rack.

[0015] The second transmission mechanism includes a self-locking transmission mechanism connected to the second motor, and the self-locking transmission mechanism is connected to the power output member.

[0016] The self-locking transmission mechanism is a screw nut mechanism.

[0017] The self-locking transmission mechanism is connected to the second motor by a third transmission mechanism, and the third transmission mechanism includes a drive gear and a driven gear that mesh with each other.

[0018] The power output member of the second transmission mechanism meshes with a transmission gear located at the power output end or the power input end of the first transmission mechanism.

[0019] The power output member of the second transmission mechanism meshes with a transmission gear located between the power input end and the power output end of the first transmission mechanism.

Advantages of the Invention

[0020] The brake caliper of the present invention can achieve reliable locking and can release the brake disc in a timely and spontaneous manner, avoiding the continuous locking of the wheels during vehicle braking.

Brief Description of the Drawings

[0021] This specification includes the following drawings, the contents of which are as follows respectively.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying out the Invention

[0022] In order for those skilled in the art to more fully, accurately, and deeply understand the concept and technical means of the present invention and to assist in its implementation, the specific embodiments of the present invention will be described in more detail below by showing examples with reference to the drawings.

[0023] Example 1 As shown in FIG. 1, this example provides a brake caliper. The brake caliper includes an actuator, a brake caliper assembly 2, an inner pad, an outer pad, a motion conversion mechanism, and a lock mechanism. The actuator includes a first motor and a first transmission mechanism, and the lock mechanism includes a second motor 6 and a second transmission mechanism connected to the second motor 6 and having a self-locking function. The power output member 3 of the second transmission mechanism has a plurality of convex teeth that mesh with one transmission gear 1 on the power transmission path of the first transmission mechanism in the locked state.

[0024] As shown in FIGS. 1 and 3, the brake caliper assembly 2 has a floating caliper structure, has a cylinder hole and a claw structure, and an inner pad, a brake disc, and an outer pad are sequentially attached in the claw structure. The gear at the power input end of the first transmission mechanism is connected to the first motor, and the transmission gear 1 at the power output end of the first transmission mechanism is connected to the motion conversion mechanism. The motion conversion mechanism includes a rotating member 8 and a translating member 9, and the motion conversion mechanism can be a ball screw or a sliding screw. In this embodiment, the motion conversion mechanism is a ball screw, the rotating member 8 is a screw shaft, the translating member 9 is a piston, and the translating member 9 and the rotating member 8 constitute a ball screw. An inner spiral orbit adapted to the outer spiral orbit of the rotating member 8 is provided on the inner wall of the translating member 9, and the end face of the translating member 9 is connected to the inner pad.

[0025] As shown in FIGS. 1, 3, and 4, in this embodiment, the power output member 3 of the second transmission mechanism meshes with a transmission gear 1 located at the power output end of the first transmission mechanism. The transmission gear 1 is connected to a rotating member 8. When the transmission gear 1 rotates, the rotating member 8 rotates synchronously. The power output member 3 of the second transmission mechanism is a semi-closed gear. The semi-closed gear is provided with a toothed area where convex teeth are uniformly arranged and a toothless area where no convex teeth are arranged, respectively. The teeth of the semi-closed gear are not arranged over the entire circumference of the pitch circle. The arc degree of the toothed area is greater than 180 degrees, and the arc degree of the toothless area is less than 180 degrees. The convex teeth in the toothed area of the power output member 3 can mesh with the transmission gear 1, and the power output member 3 can roll along the transmission gear 1 until the toothed area of the power output member 3 disengages from the transmission gear 1. In this way, during the operation of the second motor 6, when the power output member 3 rotates and the toothed area of the power output member 3 meshes with the transmission gear 1, the power output member 3 can roll along the transmission gear 1. At that time, the power output member 3 can rotate the transmission gear 1. The transmission gear 1 rotates the rotating member 8 synchronously, and the rotating member 8 linearly moves the translating member 9, and the brake caliper can be released in a timely manner. After the power output member 3 rotates by a set angle, the toothed area of the power output member 3 disengages from the transmission gear 1. The power output member 3 rotates until the toothless area corresponds to the transmission gear 1, and the power output member 3 can no longer rotate the transmission gear 1.

[0026] As shown in FIGS. 1 and 3, the second transmission mechanism further includes a worm 4 connected to the second motor 6. The worm 4, which is the power input member of the second transmission mechanism, meshes with the power output member 3. The first motor and the second motor 6 are fixedly provided. One end of the worm 4 is fixedly connected to the output end of the second motor 6, and a bearing 7 is covered on the other end of the worm 4. The worm 4 meshes with the convex teeth in the toothed area of the power output member 3, and the axis of the power output member 3 is parallel to the axis of the transmission gear 1. The maximum rotation angle of the power output member 3 is 180 degrees. When the vehicle is in a parked state, some convex teeth in the toothed area of the power output member 3 mesh with the transmission gear 1, and some other convex teeth in the toothed area of the power output member 3 mesh with the worm 4, so that the power output member 3 is fitted with the worm 4. The formed second transmission mechanism has a self-locking function. When the transmission gear 1 cannot rotate, the motion conversion mechanism cannot operate either. A plurality of convex teeth in the toothed area of the power output member 3 mesh with the transmission gear 1, so that the strength is improved and the locking mechanism is less likely to fail, thereby enhancing the reliability.

[0027] When the first motor fails, the second motor 6 of the locking mechanism starts, and the transmission gear 1 is operated by the second transmission mechanism. Then, the transmission gear 1 operates the motion conversion mechanism, so that the caliper can release the brake disc, and it is possible to avoid the continuous locking of the wheels during vehicle braking.

[0028] As shown in FIGS. 1, 4 and 5, the brake caliper of this embodiment further includes a positioning mechanism for determining the initial position of the power output member 3. The positioning mechanism includes a position regulating pin 3a provided on the power output member 3 and a position regulating elastic piece 10b fitted with the position regulating pin 3a. The position regulating elastic piece 10b is provided with a positioning groove for fitting the position regulating pin 3a when the power output member 3 is in the initial position.

[0029] As shown in FIGS. 1, 4, and 5, the brake caliper of this embodiment further includes a gear housing 10. The gear housing 10 is provided with a guide groove 10a for fitting the position regulating pin 3a, and the position regulating elastic piece 10b is fixedly provided in the guide groove 10a. The guide groove 10a is an arc-shaped groove provided on the surface of the gear housing 10, and the guide groove 10a and the power output member 3 are coaxially provided. The relative positional relationship between the gear housing 10 and the second motor 6 is kept constant, and the power output member 3 is rotatably provided on the gear housing 10. The position regulating pin 3a is movably provided on the power output member 3, and the power output member 3 is provided with a mounting hole for accommodating the position regulating pin 3a. An elastic element 3b for applying an elastic force to the position regulating pin 3a is provided in the mounting hole. The moving direction of the position regulating pin 3a is parallel to the axis of the power output member 3. The mounting hole is a circular groove provided inside the power output member 3. One end of the position regulating pin 3a is located inside the mounting hole, and the other end of the position regulating pin 3a extends outside the mounting hole, and this end of the position regulating pin 3a is in contact with the position regulating elastic piece 10b.

[0030] As shown in FIG. 4, a screw is provided in the mounting hole, and the screw is screwed with the power output member 3. The elastic element 3b is sandwiched between the screw and the position regulating pin 3a, and the elastic element 3b is a cylindrical coil spring and is a compression spring.

[0031] As shown in FIGS. 1, 4, and 5, the position regulating elastic piece 10b is provided with protrusions on both sides of the positioning groove. The positioning groove is located at the intermediate position between the two protrusions, and the protrusions protrude toward the inside of the guide groove 10a. The distance between the top end of the protrusion and the power output member 3 is shorter (smaller) than the distance between the positioning groove and the power output member 3. During rotation, the power output member 3 can synchronously rotate the position regulating pin 3a and move the position regulating pin 3a between the first position a, the second position b, and the third position c. The first position a, the second position b, and the third position c are on the same circumference, and the second position is between the first position a and the third position c. The main role of the position regulating pin 3a is to determine the initial position of the power output member 3. After the position regulating pin 3a is fitted into the positioning groove, the position regulating pin 3a is located at the second position b. At this time, the toothed area of the power output member 3 and the transmission gear 1 will be disengaged, and since they are not meshing, the locking mechanism will not be able to lock the transmission gear 1. The first position a and the third position c are respectively located at both ends in the arc length direction of the guide groove 10a, and the included angle between the first position a and the third position c is the maximum rotation angle of the power output member 3.

[0032] The process of realizing the locking function of the brake caliper in this embodiment is as follows.

[0033] When the vehicle parks, the first motor operates. After the power is transmitted to the transmission gear 1, the transmission gear 1 is rotated along the first direction. The transmission gear 1 drives the motion conversion mechanism to perform corresponding operations, causing the brake caliper to perform a clamping operation. When the predetermined parking clamping force is reached, the second motor 6 rotates the worm 4, and further the worm 4 rotates the power output member 3 along the second direction, and the convex teeth in the toothed area of the power output member 3 begin to mesh with the teeth of the transmission gear 1.

[0034] As the power output member 3 starts to rotate, the position regulating pin 3a begins to move from the second position b, and the position regulating pin 3a contacts the protrusion of the position regulating elastic piece 10b. After the contact force exceeds the elastic force of the elastic element 3b, the position regulating pin 3a linearly moves towards the mounting hole. Along with the rotation of the power output member 3, the position regulating pin 3a overrides the protrusion of the position regulating elastic piece 10b.

[0035] The power output member 3 continuously moves the position regulating pin 3a within the guide groove 10a until the position regulating pin 3a moves to the first position a. At this time, the position regulating pin 3a contacts the inner wall surface at one end in the arc length direction of the guide groove 10a, and the rotation of the power output member 3 stops. The second motor 6 stops operating after the power is turned off, and the toothed area of the power output member 3 meshes with the worm 4 and the transmission gear 1 simultaneously. Since the second transmission mechanism has a self-locking function, the transmission gear 1 is locked, and the motion conversion mechanism cannot operate, thus realizing the parking lock function.

[0036] The first direction and the second direction are two opposite rotational directions. If the first direction is counterclockwise, the second direction is clockwise.

[0037] The process of realizing the emergency release function of the brake caliper in this embodiment is as follows.

[0038] When the vehicle brakes and the first motor or the circuit controlling the first motor fails, due to the rotational resistance of the transmission system itself, the brake disc and the brake pads cannot be automatically released or fully released, so the brake caliper remains in the clamped state.

[0039] At this time, start the second motor 6 of the locking mechanism. The second motor 6 rotates the worm 4, and further the worm 4 rotates the power output member 3 along the first direction. After the convex teeth in the toothed area of the power output member 3 start to mesh with the teeth of the transmission gear 1, the power output member 3 starts to rotate the transmission gear 1 along the second direction, and the transmission gear 1 drives the motion conversion mechanism to perform corresponding operations, causing the brake caliper to perform a release operation and eliminating the clamping force.

[0040] That is, when the main motor or the control circuit fails, the second motor starts to release the residual force between the brake pads and the brake disc, so that the vehicle can run normally as before and meet the automatic driving function above L3 level under the action of the EMBs of the other three wheels.

[0041] As the worm wheel 5 starts to rotate, the power output member 3 moves the position regulating pin 3a from the second position b, and the position regulating pin 3a contacts the protrusion of the position regulating elastic piece 10b. After the contact force exceeds the elastic force of the elastic element 3b, the position regulating pin 3a linearly moves towards the mounting hole, and as the power output member 3 rotates, the position regulating pin 3a overrides the protrusion of the position regulating elastic piece 10b.

[0042] The power output member 3 continues to move the position regulating pin 3a within the guide groove 10a until the position regulating pin 3a moves to the third position c. At this time, the position regulating pin 3a contacts the inner wall surface at the other end in the arc length direction of the guide groove 10a, and the rotation of the power output member 3 stops.

[0043] Embodiment 2 As shown in Fig. 2, different from Embodiment 1, the brake caliper of this embodiment further includes a worm 4 connected to the second motor 6 and a worm wheel 5 meshing with the worm 4 in the second transmission mechanism. The worm wheel 5 is fixedly connected coaxially with the power output member 3, and the worm wheel 5 is connected to the power output member 3 to form a two-stage gear. The worm wheel 5 rotates synchronously with the power output member 3. After the second motor 6 operates, the worm 4 rotates the worm wheel 5, and the worm wheel 5 can rotate the power output member 3 by 360 degrees.

[0044] The brake caliper of this embodiment similarly includes a positioning mechanism for determining the initial position of the power output member 3. The positioning mechanism includes a position regulating pin 3a and a position regulating elastic piece 10b that fits with the position regulating pin 3a. The position regulating pin 3a may be provided on the power output member 3 or may be provided on the worm wheel 5 fixedly connected coaxially with the power output member 3. In this example, the position regulating pin 3a is provided on the power output member 3.

[0045] As shown in Fig. 8, in this embodiment, the guide groove 10a is an annular groove extending circumferentially on the gear housing 10. The guide groove 10a is provided coaxially with the power output member 3, and the position regulating elastic piece 10b is fixedly provided in the guide groove 10a. Two protrusions are respectively provided on both sides of the positioning groove of the position regulating elastic piece 10b. The positioning groove is located at the intermediate position between the two protrusions. The protrusions protrude toward the inside of the guide groove 10a, and the distance between the top end of the protrusion and the power output member 3 is shorter than the distance between the positioning groove and the power output member 3. The power output member 3 is capable of synchronously rotating the position regulating pin 3a during rotation. The main role of the position regulating pin 3a is to determine the initial position of the power output member 3. After the position regulating pin 3a is fitted into the positioning groove, at this time the position regulating pin 3a is located at the initial position, and the toothed area of the power output member 3 and the transmission gear 1 are disengaged. Since the two are not meshed, the locking mechanism cannot lock the transmission gear 1.

[0046] Embodiment 3 As shown in Fig. 6, the brake caliper of this embodiment has a different structure of the locking mechanism from that of Embodiment 1 and Embodiment 2. In this embodiment, the power output member 3 of the second transmission mechanism is a rack. The second transmission mechanism further includes a self-locking transmission mechanism connected to the second motor 6. The self-locking transmission mechanism has a self-locking function, and the self-locking transmission mechanism is connected to the power output member 3.

[0047] In this embodiment, the self-locking transmission mechanism is a screw nut mechanism, and the self-locking transmission mechanism includes a mating screw shaft 12 and a nut 13. The screw shaft 12 and the nut 13 constitute a helical transmission pair, and the screw shaft 12 is fixedly connected to the power output member 3. The nut 13 is fixedly connected coaxially with the driven gear 14. The driven gear 14 meshes with the drive gear 11, and the drive gear 11 is fixedly connected to the output end of the second motor 6. The driven gear 14 cooperates with the drive gear 11 to constitute a third transmission mechanism.

[0048] The process of realizing the locking function of the brake caliper in this embodiment is as follows.

[0049] When the vehicle parks, the first motor starts. After the power is transmitted to the transmission gear 1, the transmission gear 1 is rotated along the first direction. The transmission gear 1 drives the motion conversion mechanism to perform corresponding operations, causing the brake caliper to perform a clamping operation. When a predetermined parking clamping force is reached, the second motor 6 operates the third transmission mechanism. The third transmission mechanism operates the self-locking transmission mechanism, and the screw shaft 12 of the self-locking transmission mechanism linearly moves the power output member 3. After the power output member 3 moves a set distance, the power output member 3 meshes with the transmission gear 1, and the rotation of the power output member 3 stops. The second motor 6 stops operating after the power is turned off, and the power output member 3 meshes with the transmission gear 1. The second transmission mechanism has a self-locking function, and the transmission gear 1 is locked, so that the motion conversion mechanism cannot operate, thereby realizing the parking lock function.

[0050] The process of realizing the emergency release function of the brake caliper in this embodiment is as follows.

[0051] When the vehicle brakes and the first motor or the circuit controlling the first motor fails, due to the rotational resistance of the transmission system itself, the brake disc and the brake pads cannot be automatically released or fully released, so the brake caliper remains in the clamped state.

[0052] At this time, the second motor 6 of the locking mechanism is started, and the second motor 6 operates the third transmission mechanism. The third transmission mechanism operates the self-locking transmission mechanism, and the screw shaft 12 of the self-locking transmission mechanism linearly moves the power output member 3. After the power output member 3 meshes with the transmission gear 1, the power output member 3 rotates the transmission gear 1 along the second direction, and the transmission gear 1 drives the motion conversion mechanism to perform corresponding operations, causing the brake caliper to perform a release operation and eliminating the clamping force.

[0053] That is, when the main motor or the control circuit fails, the second motor operates to release the residual force between the brake pads and the brake disk, and the vehicle can run normally as before, meeting the requirements of the automatic driving function at L3 level or above.

[0054] Embodiment 4 As shown in FIG. 7, in the brake caliper of this embodiment, the position of the transmission gear is different from that in Embodiment 2. In this embodiment, the power output member 3 of the second transmission mechanism meshes with the transmission gear 1c located at the power input end of the first transmission mechanism. The transmission gear 1c at the power input end of the first transmission mechanism is fixedly connected to the output end of the first motor, and the transmission gear 1a at the power output end of the first transmission mechanism is connected to the motion conversion mechanism.

[0055] The brake caliper of this embodiment also includes a positioning mechanism for determining the initial position of the power output member 3. The positioning mechanism includes a position regulating pin 3a and a position regulating elastic piece 10b that fits with the position regulating pin 3a. When the volume of the power output member 3 is small, the position regulating pin 3a may be fixedly provided on the power output member 3, or may be fixedly provided on the worm wheel 5 fixedly connected coaxially with the power output member 3. The position regulating pin 3a is integrally formed with the power output member 3 or the worm wheel 5. In this embodiment, the position regulating pin 3a is integrated with the power output member 3.

[0056] The relative positional relationship between the gear housing 10 and the second motor 6 is kept constant. The two-stage gear composed of the power output member 3 and the worm wheel 5 is rotatably provided on the gear shaft of the gear housing 10 and is axially movable. The elastic element 3b is provided coaxially with the gear shaft of the gear housing 10, and applies an elastic force to the two-stage gear composed of the power output member 3 and the worm wheel 5. The elastic element 3b is provided on the side away from the position regulating pin 3a, and a gasket 3c is provided between the elastic element 3b and the worm wheel 5.

[0057] As the worm wheel 5 starts to rotate, the power output member 3 moves the position regulating pin 3a from the second position b. The position regulating pin 3a contacts the protrusion of the position regulating elastic piece 10b. After the contact force exceeds the elastic force of the elastic element 3b, both the power output member 3 and the worm wheel 5 rotate while linearly moving axially, and the position regulating pin 3a gets over the protrusion of the position regulating elastic piece 10b. The power output member 3 continues to move the position regulating pin 3a within the guide groove 10a until the locking or emergency release function is completed.

[0058] The power output member 3 of the second transmission mechanism meshes with the transmission gear 1a located at the power output end of the first transmission mechanism or the transmission gear 1c at the power input end. Alternatively, the power output member 3 of the second transmission mechanism meshes with the intermediate gear 1b located between the power input end and the power output end of the first transmission mechanism.

[0059] The exemplary description of the present invention has been given in association with the drawings above. It is obvious that when specifically implementing the present invention, it is not limited to the above-mentioned method. Various non-substantial improvements made by adopting the method, concept and technical means of the present invention, or directly applying the above-mentioned concept and technical means of the present invention to other scenarios without improvement are all included in the protection scope of the present invention.

Explanation of Reference Numerals

[0060] 1 Transmission gear 1a Transmission gear at the power output end 1b Intermediate gear 1c Transmission gear at the power input end 2 Brake caliper assembly 3 Power output member 3a Position regulating pin 3b Elastic element 3c Gasket 4 Worm 5 Worm wheel 6 Second motor 7 Bearing 8 Rotating member 9 Translating member 10 Gear housing 10a guide groove 10b position regulating elastic piece 11 drive gear 12 screw shaft 13 nut 14 driven gear

Claims

1. A brake caliper including an actuator having a first motor and a first transmission mechanism, and a locking mechanism, wherein the locking mechanism includes a second motor and a second transmission mechanism connected to the second motor and having a self-locking function, The power output member of the second transmission mechanism meshes with one transmission gear on the power transmission path of the first transmission mechanism in the locked state. A brake caliper characterized by this.

2. The power output member of the second transmission mechanism is a semi-closed gear, and the semi-closed gear is provided with one toothed region where convex teeth are uniformly arranged and one toothless region where convex teeth are not arranged, respectively. The brake caliper according to claim 1, characterized by this.

3. The second transmission mechanism includes a worm connected to the second motor, and the worm meshes with the power output member. The brake caliper according to claim 2, characterized by this.

4. The second transmission mechanism includes a worm connected to the second motor and a worm wheel meshing with the worm, and the worm wheel is connected to the power output member. The brake caliper according to claim 2, characterized by this.

5. The brake caliper according to any one of claims 1 to 4, further including a positioning mechanism for determining the initial position of the power output member.

6. The positioning mechanism includes a position regulating pin and a position regulating elastic piece fitted with the position regulating pin, and the position regulating elastic piece is provided with a positioning groove for fitting the position regulating pin when the power output member is in the initial position. The brake caliper according to claim 5, characterized by this.

7. Further including a gear housing, the gear housing is provided with a guide groove for fitting the position regulating pin, and the position regulating elastic piece is located in the guide groove. The brake caliper according to claim 6, characterized by this.

8. The position regulating pin is movably provided on the power output member or a worm wheel installed coaxially with the power output member, The power output member or the worm wheel provided coaxially with the power output member is provided with a mounting hole for accommodating the position regulating pin, and an elastic element for applying an elastic force to the position regulating pin is provided in the mounting hole. The brake caliper according to claim 7, characterized by this.

9. The position regulating pin is fixedly provided on the power output member or a worm wheel installed coaxially with the power output member. On the side away from the guide groove in the worm wheel installed coaxially with the power output member or the power output member, an elastic element is provided. The elastic element applies an elastic force to the power output member or the worm wheel installed coaxially with the power output member. A gasket is provided between the elastic element and the power output member or the worm wheel installed coaxially with the power output member. The brake caliper according to claim 7 is characterized in that.

10. The power output member of the second transmission mechanism is a rack. The brake caliper according to claim 1 is characterized in that.

11. The second transmission mechanism includes a self-locking transmission mechanism connected to the second motor. The self-locking transmission mechanism is connected to the power output member. The brake caliper according to claim 10 is characterized in that.

12. The self-locking transmission mechanism is a screw nut mechanism. The brake caliper according to claim 11 is characterized in that.

13. The self-locking transmission mechanism is connected to the second motor by a third transmission mechanism. The third transmission mechanism includes a drive gear and a driven gear that mesh with each other. The brake caliper according to claim 12 is characterized in that.

14. The power output member of the second transmission mechanism meshes with a transmission gear located at the power output end or the power input end of the first transmission mechanism. The brake caliper according to any one of claims 1 to 13 is characterized in that.

15. The power output member of the second transmission mechanism meshes with a transmission gear located between the power input end and the power output end of the first transmission mechanism. The brake caliper according to any one of claims 1 to 13 is characterized in that.

16. Protrusions are respectively provided on both sides of the positioning groove on the position regulating elastic piece. The distance between the top end of the protrusion and the power output member is shorter than the distance between the positioning groove and the power output member. The brake caliper according to claim 6 is characterized in that.

17. The guide groove is an annular or arc-shaped groove provided on the surface of the gear housing. The guide groove is provided coaxially with the power output member. The brake caliper according to claim 7 is characterized in that.

18. The mounting hole is provided with a screw that engages with the power output member, and the elastic element is sandwiched between the screw and the position regulating pin. The brake caliper according to claim 8, characterized in that.

19. The elastic element is a cylindrical coil spring and is a compression spring. The brake caliper according to claim 8, characterized in that.

20. The self-locking transmission mechanism includes a screw shaft and a nut that fit together. The screw shaft is fixedly connected to the power output member, and the nut is fixedly connected coaxially with the driven gear. The brake caliper according to claim 13, characterized in that.

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