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, a locking mechanism needs to be added 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 cannot be 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 occurs in at least one of the four wheels of the vehicle, and the vehicle cannot drive safely and cannot meet the requirements of automatic driving at L3 level or above.

[0004] Also, in the conventional EMB technology, the locking mechanism only has a parking function and does not have a 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 objective, the present invention employs the following technical means: A brake caliper comprising an actuator and a locking mechanism, wherein the actuator comprises a first motor and a first transmission mechanism, and the locking mechanism comprises a second motor and a second transmission mechanism connected to the second motor and having a self-locking function, wherein the power output member of the second transmission mechanism has a plurality of convex teeth that mesh with a transmission gear on the power transmission path of the first transmission mechanism when locked.

[0007] 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 in which the convex teeth are uniformly arranged, and one toothless region in which the convex teeth are not arranged.

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

[0009] The second transmission mechanism includes a worm connected to the second motor and a worm wheel that meshes with the worm, the worm wheel being 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 that engages with the position regulating pin, the position regulating elastic piece being provided with a positioning groove for engaging the position regulating pin when the power output member is in its initial position.

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

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

[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, the third transmission mechanism including 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 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. [Effects of the Invention]

[0020] The brake caliper of the present invention ensures reliable locking and can release the brake disc in a timely and spontaneous manner, thereby preventing the wheel from remaining locked during vehicle braking. [Brief explanation of the drawing]

[0021] This specification includes the following drawings, each with the following characteristics: [Figure 1] This is a schematic diagram showing a part of the brake caliper configuration of Example 1. [Figure 2]It is a schematic diagram showing a part of the configuration of the brake caliper of Example 2. [Figure 3] It is a partial cross-sectional view of the brake caliper. [Figure 4] It is a schematic diagram showing the configuration of the power output member and the positioning mechanism. [Figure 5] It is a cross-sectional view of the positioning mechanism. [Figure 6] It is a schematic diagram showing the configuration of the lock mechanism of Example 3. [Figure 7] It is a schematic diagram showing a part of the configuration of the brake caliper of Example 4. [Figure 8] It is a schematic diagram showing the configuration of the power output member and the positioning mechanism. [Figure 9] It is a schematic diagram showing the configuration of the power output member and the positioning mechanism of Example 4.

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 III 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 Figures 1 and 3, the brake caliper assembly 2 is a floating caliper structure having a cylinder bore and a claw structure, in which an inner pad, a brake disc, and an outer pad are mounted in order. 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 a motion conversion mechanism. The motion conversion mechanism includes a rotating member 8 and a translational 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 translational member 9 is a piston, and the translational member 9 and the rotating member 8 constitute a ball screw. The inner wall of the translational member 9 is provided with an internal helical track that fits the external helical track of the rotating member 8, and the end face of the translational member 9 is connected to the inner pad.

[0025] As shown in Figures 1, 3, and 4, in this embodiment, the power output member 3 of the second transmission mechanism meshes with the 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, and 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, and the semi-closed gear has one toothed region with uniformly arranged convex teeth and one toothless region without convex teeth. The teeth of the semi-closed gear are not arranged over the entire circumference of the pitch circle, the arc of the toothed region is greater than 180 degrees, and the arc of the toothless region is less than 180 degrees. The convex teeth of the toothed region 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 region of the power output member 3 disengages from the transmission gear 1. In this way, when the second motor 6 is in operation, the power output member 3 rotates and the toothed region of the power output member 3 engages 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 in sync, and the rotating member 8 moves the translation member 9 in a straight line, allowing the brake caliper to be released in a timely manner. After the power output member 3 has rotated by the set angle, the toothed region of the power output member 3 disengages from the transmission gear 1, the power output member 3 rotates until the toothless region corresponds to the transmission gear 1, and the power output member 3 can no longer rotate the transmission gear 1.

[0026] As shown in Figures 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 installed. One end of the worm 4 is fixedly connected to the output end of the second motor 6, and a bearing 7 is covered over the other end of the worm 4. The worm 4 meshes with the convex teeth of the toothed region 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 parked, the power output member 3 is fitted with the worm 4 by some of the convex teeth of the toothed region of the power output member 3 meshing with the transmission gear 1, and some of the other convex teeth of the toothed region of the power output member 3 meshing with the worm 4. The formed second transmission mechanism has a self-locking function, so that if the transmission gear 1 becomes unable to rotate, the motion conversion mechanism will also become unable to operate. The multiple convex teeth in the toothed region of the power output member 3 mesh with the transmission gear 1, improving strength and making the locking mechanism less prone to failure, thereby increasing reliability.

[0027] If the first motor fails, the second motor 6 of the locking mechanism is activated, and the second transmission mechanism operates the transmission gear 1. The transmission gear 1 then operates the motion conversion mechanism, allowing the caliper to release the brake disc, thus preventing the wheels from remaining locked during vehicle braking.

[0028] As shown in Figures 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 that engages 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 its initial position.

[0029] As shown in Figures 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 a position regulating pin 3a, and a 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 provided coaxially. 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 in the gear housing 10. The position regulating pin 3a is movably provided in 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 is provided in the mounting hole to impart elastic force to the position regulating pin 3a. The direction of movement 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, with this end in contact with the position regulating elastic piece 10b.

[0030] As shown in Figure 4, a screw is provided in the mounting hole, and the screw is screwed into 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 a compression spring.

[0031] As shown in Figures 1, 4, and 5, the position-regulating elastic piece 10b has projections on both sides of the positioning groove. The positioning groove is located midway between the two projections, and the projections protrude toward the guide groove 10a. The distance between the top of the projection and the power output member 3 is shorter (smaller) than the distance between the positioning groove and the power output member 3, so that during rotation, the power output member 3 rotates the position-regulating pin 3a synchronously, allowing the position-regulating pin 3a to move 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, it is positioned at the second position b. At this time, the toothed region of the power output member 3 and the transmission gear 1 are disengaged, and since they are not meshing, the locking mechanism cannot lock the transmission gear 1. The first position a and the third position c are located at opposite ends in the arc length direction of the guide groove 10a, and the 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 for achieving the locking function of the brake caliper in this embodiment is as follows:

[0033] When the vehicle is parked, the first motor activates, and power is transmitted to the transmission gear 1, which then rotates along the first direction. The transmission gear 1 drives the motion conversion mechanism and performs a corresponding action, causing the brake caliper to clamp. When a predetermined parking clamping force is reached, the second motor 6 rotates the worm 4, which in turn rotates the power output member 3 along the second direction, and the convex teeth of the toothed region of the power output member 3 begin to mesh with the teeth of the transmission gear 1.

[0034] As the power output member 3 begins to rotate, the position regulating pin 3a begins to move from the second position b, and the position regulating pin 3a comes into contact with the projection 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 moves linearly toward the mounting hole, and as the power output member 3 rotates, the position regulating pin 3a moves over the projection of the position regulating elastic piece 10b.

[0035] 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 first position a. At this time, the position regulating pin 3a contacts the inner wall surface of one end of the guide groove 10a in the arc length direction, 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 region 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, the motion conversion mechanism cannot be operated, and a parking lock function is realized.

[0036] The first and second directions are two opposite directions of rotation; if the first direction is counterclockwise, then the second direction is clockwise.

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

[0038] If the first motor or the circuit controlling the first motor fails during vehicle braking, the brake disc and brake pads cannot automatically or completely release due to the rotational resistance of the transmission system itself, and the brake caliper remains clamped.

[0039] At this time, the second motor 6 of the locking mechanism is activated, and the second motor 6 rotates the worm 4, which in turn rotates the power output member 3 along the first direction. After the convex teeth of the toothed region of the power output member 3 begin to mesh with the teeth of the transmission gear 1, the power output member 3 begins to rotate the transmission gear 1 along the second direction, and the transmission gear 1 drives the motion conversion mechanism to perform a corresponding action, causing the brake caliper to release and the clamping force to be relieved.

[0040] In other words, if the main motor or control circuit fails, the second motor activates to release the residual force between the brake pads and brake discs, allowing the vehicle to run normally as before, and under the action of the EMBs of the other three wheels, it can meet the L3 level or higher autonomous driving function.

[0041] As the worm wheel 5 begins to rotate, the power output member 3 moves the position regulating pin 3a from the second position b, and the position regulating pin 3a comes into contact with the projection 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 moves linearly toward the mounting hole, and as the power output member 3 rotates, the position regulating pin 3a moves over the projection 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 comes into contact with the inner wall surface of the other end in the arc length direction of the guide groove 10a, and the rotation of the power output member 3 stops.

[0043] Example 2 As shown in Figure 2, the brake caliper of this embodiment differs from that of Embodiment 1 in that the second transmission mechanism further includes a worm 4 connected to the second motor 6 and a worm wheel 5 that meshes with the worm 4. The worm wheel 5 is fixedly connected coaxially to 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, and after the second motor 6 is operated, the worm 4 rotates the worm wheel 5, and the worm wheel 5 can rotate the power output member 3 360 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 engages with the position regulating pin 3a. The position regulating pin 3a may be provided on the power output member 3 or on a worm wheel 5 that is fixedly connected coaxially to 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 Figure 8, in this embodiment, the guide groove 10a is an annular groove extending circumferentially on the gear housing 10, and the guide groove 10a is provided coaxially with the power output member 3, while the position-regulating elastic piece 10b is fixedly provided in the guide groove 10a. The position-regulating elastic piece 10b has two projections on each side of the positioning groove. The positioning groove is located midway between the two projections, and the projections protrude inward into the guide groove 10a. The distance between the top of the projections 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 designed to synchronously rotate 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, the position-regulating pin 3a is in its initial position, and the toothed region 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] Example 3 As shown in Figure 6, the brake caliper of this embodiment differs from that of Embodiments 1 and 2 in the structure of the locking mechanism. 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 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 fitted 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 to 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 terminal of the second motor 6. The driven gear 14 cooperates with the drive gear 11 to constitute a third transmission mechanism.

[0048] The process for achieving the locking function of the brake caliper in this embodiment is as follows:

[0049] When the vehicle is parked, the first motor starts, and power is transmitted to the transmission gear 1, which then rotates the transmission gear 1 along the first direction. The transmission gear 1 drives the motion conversion mechanism to perform a corresponding operation, causing the brake caliper to clamp. 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 moves the power output member 3 in a straight line. After the power output member 3 has moved a set distance, it 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, so the transmission gear 1 is locked, and the motion conversion mechanism cannot be operated, thus realizing a parking lock function.

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

[0051] If the first motor or the circuit controlling the first motor fails during vehicle braking, the brake disc and brake pads cannot automatically or completely release due to the rotational resistance of the transmission system itself, and the brake caliper remains clamped.

[0052] At this time, the second motor 6 of the locking mechanism is activated, and the second motor 6 drives the third transmission mechanism. The third transmission mechanism activates the self-locking transmission mechanism, and the screw shaft 12 of the self-locking transmission mechanism moves the power output member 3 in a straight line. 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 a corresponding operation, causing the brake caliper to release and the clamping force to be relieved.

[0053] In other words, if the main motor or control circuit fails, the second motor will activate to release the residual force between the brake pads and brake discs, allowing the vehicle to run normally as before and fulfilling the requirements of an autonomous driving function at L3 level or higher.

[0054] Example 4 As shown in Figure 7, the position of the transmission gear in the brake caliper of this embodiment differs from that of 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 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 engages 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 fixedly provided on a worm wheel 5 that is fixedly connected coaxially to the power output member 3, and the position regulating pin 3a is integrally configured 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, consisting of a power output member 3 and a worm wheel 5, is rotatably mounted on the gear shaft of the gear housing 10 and is also axially movable. The elastic element 3b is mounted coaxially with the gear shaft of the gear housing 10 and imparts elastic force to the two-stage gear consisting of the power output member 3 and the worm wheel 5. The elastic element 3b is located 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 begins to rotate, the power output member 3 moves the position regulating pin 3a from the second position b. The position regulating pin 3a comes into contact with the projection of the position regulating elastic piece 10b. After the contact force exceeds the elastic force of the elastic element 3b, the power output member 3 and the worm wheel 5 rotate together while moving linearly in the axial direction, and the position regulating pin 3a moves over the projection 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 above has been an illustrative description of the present invention in conjunction with the drawings. It is clear that the present invention is not limited to the above-described methods when it is specifically implemented. Various non-substantial improvements made by adopting the methods, concepts and technical means of the present invention, or direct applications of the above-described concepts and technical means of the present invention in other contexts without modification, are all within the scope of protection of the present invention. [Explanation of symbols]

[0060] 1. Transmission gear 1a Power output end transmission gear 1b Intermediate gear 1c Power input terminal transmission gear 2. Brake caliper assembly 3 Power output component 3a Position control pin 3b Elastic element 3c gasket 4 Warm 5 Worm Wheels 6. Second motor 7 bearings 8 Rotating Members 9 Translational member 10 Gear Housing 10a Guide groove 10b Position-regulating elastic piece 11 Drive gear 12 Screw shaft 13 nuts 14 Driven gear

Claims

1. A brake caliper comprising an actuator having a first motor and a first transmission mechanism, and a locking mechanism, wherein the locking mechanism comprises 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 engages with one transmission gear on the power transmission path of the first transmission mechanism when locked. A brake caliper further comprising a positioning mechanism for determining the initial position of the power output member.

2. The brake caliper according to claim 1, characterized in that 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 in which convex teeth are uniformly arranged and one toothless region in which no convex teeth are arranged.

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

4. The brake caliper according to claim 2, wherein the second transmission mechanism includes a worm connected to the second motor and a worm wheel that meshes with the worm, and the worm wheel is connected to the power output member.

5. The brake caliper according to claim 1, wherein the positioning mechanism includes a position regulating pin and a position regulating elastic piece that engages 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 an initial position.

6. The brake caliper according to claim 5, further comprising a gear housing, wherein 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.

7. The position regulating pin is movably provided on the power output member or on a worm wheel installed coaxially with the power output member. The brake caliper according to claim 6, characterized in that the power output member or the worm wheel provided coaxially with the power output member is provided with a mounting hole for housing the position regulating pin, and an elastic element for imparting elastic force to the position regulating pin is provided in the mounting hole.

8. The position regulating pin is fixedly provided on the power output member or the worm wheel installed coaxially with the power output member, and an elastic element is provided on the side of the power output member or the worm wheel installed coaxially with the power output member that is away from the guide groove. The brake caliper according to claim 6, characterized in that the elastic element imparts an elastic force to the power output member or the worm wheel provided coaxially with the power output member, and a gasket is provided between the elastic element and the power output member or the worm wheel provided coaxially with the power output member.

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

10. The brake caliper according to claim 9, wherein 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.

11. The brake caliper according to claim 10, characterized in that the self-locking transmission mechanism is a screw nut mechanism.

12. The brake caliper according to claim 11, characterized in that 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.

13. The brake caliper according to any one of claims 1 to 12, characterized in that the power output member of the second transmission mechanism meshes with a transmission gear located at the power output end or power input end of the first transmission mechanism.

14. The brake caliper according to any one of claims 1 to 12, characterized in that 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.

15. The brake caliper according to claim 5, characterized in that the position-regulating elastic piece is provided with protrusions on both sides of the positioning groove, and the distance between the top of the protrusion and the power output member is shorter than the distance between the positioning groove and the power output member.

16. The brake caliper according to claim 6, characterized in that the guide groove is an annular or arc-shaped groove provided on the surface of the gear housing, and the guide groove is provided coaxially with the power output member.

17. The brake caliper according to claim 7, characterized in that 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.

18. The brake caliper according to claim 7, characterized in that the elastic element is a cylindrical coil spring and a compression spring.

19. The brake caliper according to claim 12, characterized in that the self-locking transmission mechanism includes a screw shaft and a nut that fit together, the screw shaft being fixedly connected to the power output member, and the nut being fixedly connected coaxially to the driven gear.

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