Electromechanical brake caliper and brake system

Abstract

The present invention provides an electromechanical brake caliper and brake system in the field of brake calipers. The electromechanical brake caliper includes an actuator, a motion conversion mechanism (4), and a brake caliper body (5). The actuator includes a casing body (1) and a motor (2) and a reduction gear mechanism (3) therein. The output shaft of the motor (2) is connected to the brake caliper body (5) via the reduction gear mechanism (3) and the motion conversion mechanism (4). The electromechanical brake caliper further includes an elastic return mechanism that stores energy during the brake clamping process and returns components connected to the brake caliper body (5) during the brake release process. The elastic return mechanism is installed in the transmission path of the brake caliper body (5). The electromechanical brake caliper replaces the rectangular seal ring of a hydraulic brake caliper and has a mechanical active return function, allowing the gap between the brake pad and the brake disc (17) to be maintained within a reasonable gap range.

Description

[Technical Field]

[0001] The present invention relates to the technical field of brake calipers, and more particularly to electromechanical brake calipers and braking systems. [Background technology]

[0002] With the shift to electrified vehicles, brake-by-wire systems have become a major development trend in the automotive industry. One such system, the electromechanical brake (EMB) system, directly drives the motor at the wheel end. A motion conversion mechanism converts the motor's torque and rotational motion into thrust and translation of connecting components, which presses the brake pads and clamps the brake disc, generating braking force. At the same time, as an emerging braking system, electromechanical brakes eliminate large components such as vacuum boosters and hydraulic lines, allowing for a simpler and more flexible vehicle chassis layout and faster, more accurate pressure adjustment speeds, significantly improving vehicle braking performance.

[0003] While conventional hydraulic brake calipers use a rectangular seal ring to return the lead nut in the motion conversion mechanism to a reasonable position, the return of the electronic dry brake requires overcoming the resistance of the motor and the multi-stage transmission mechanism, which is much greater than that of a hydraulic brake caliper. Therefore, the conventionally designed rectangular seal ring cannot meet the return requirements of the electronic dry brake piston.

[0004] Conventional electromechanical brake calipers use electronic control to complete the return of the screw nut (piston) and return it to a reasonable position. However, there is a problem in that the judgment of the clamping force is subject to various interferences (for example, interference from inertial forces). Specifically, according to Newton's second law, force is the product of mass and acceleration or deceleration (vehicle acceleration mode or energy recovery mode). If the vehicle is not stationary or at a constant speed, additional inertial forces will be generated. Therefore, acceleration or deceleration of the vehicle while driving can cause an erroneous judgment in the control system, and there is a risk that the brake will not return to a reasonable position (the gap between the brake pad and the brake disc is the initial gap).

[0005] Patent Publication No. CN115217871A discloses an electromechanical brake caliper, a braking system, a vehicle, and a design method. The electromechanical brake caliper includes a casing, a brake disc, brake pads, and an actuator component. The actuator component includes a motor and a transmission mechanism, and the motor has a stator and a rotor. The rotor surrounds the transmission mechanism and is connected to the power input end of the transmission mechanism. The transmission mechanism can convert the rotational motion of the power input end into linear motion of the power output end, which can press the brake pads against the brake disc. Although this electromechanical brake caliper has a compact structure and occupies a small space, it still relies on electronic control to return the piston, which does not solve the problem of the piston not returning to its initial position during return. Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention, which has been made to solve the above technical problems, provides an electromechanical brake caliper and braking system, which can replace the rectangular seal ring of a hydraulic brake caliper and has a mechanical active return function, thereby maintaining the gap between the brake pad and the brake disc within a reasonable range. [Means for solving the problem]

[0007] To achieve the above object, the present invention provides the following technical solution: the electromechanical brake caliper includes an actuator, a motion conversion mechanism, and a brake caliper body, the actuator includes a casing body and a motor and a reduction gear mechanism therein, the output shaft of the motor is connected to the brake caliper body via the reduction gear mechanism and the motion conversion mechanism, and further includes an elastic return mechanism that stores energy during the brake clamping process and returns components connected to the brake caliper body during the brake release process, the elastic return mechanism being installed on the transmission path of the brake caliper body.

[0008] Preferably, the elastic return mechanism includes a mounting space and an elastic member and an intermediate member provided therein, and the elastic member is connected to the reduction gear mechanism or the transmission member of the motion conversion mechanism via the intermediate member.

[0009] Preferably, the mounting space is provided on an inner wall of the brake caliper body, the mounting space being a first annular groove having an opening to the inside, the intermediate member being provided at one end of the mounting space away from the brake pad, and the intermediate member being held-connected to a lead nut of the motion conversion mechanism, and the elastic member being matingly connected to the lead nut.

[0010] Preferably, the intermediate member is provided as a holding sleeve, and one end of the holding sleeve is provided with a position-regulating boss for engaging and connecting with the elastic member.

[0011] Preferably, the elastic member is provided as an elastic member that is compressed in the axial direction and stored in energy, and includes a wave spring and a cylindrical coil spring.

[0012] Preferably, the casing body includes a rear end cover provided to cover a surface of the reduction gear mechanism, the mounting space includes a positioning space for arranging the elastic member, the positioning space being formed between the rear end cover and the reduction gear mechanism, and both ends of the elastic member being connected to the rear end cover via position regulating posts, respectively, to maintain the initial stored force.

[0013] Preferably, the positioning space includes a receiving tank provided on at least one gear end surface of the reduction gear mechanism or on the rear end cover.

[0014] Preferably, the mounting space further includes a second annular groove provided at the center of at least one gear of the reduction gear mechanism, and the intermediate member includes an intermediate dial ring held and connected to an inner pillar of the second annular groove, and the intermediate dial ring is abutted and connected to one end of the elastic member.

[0015] Preferably, the elastic member is provided as an elastic member that is compressed in a circumferential direction to store energy, and includes a coil spring and an arc coil spring.

[0016] The present invention further provides a braking system including the electromechanical brake caliper. [Effects of the Invention]

[0017] The beneficial effects of the present invention are as follows:

[0018] The present invention provides an elastic return mechanism, including an installation space, an elastic member, and an intermediate member, in the power transmission path of the brake caliper body, so that the electromechanical brake caliper can maintain a mechanical active return function.

[0019] 1) During the brake clamping process, the elastic member is charged. During the brake release process, due to the constraints of the installation space and the thrust generated by the charged elastic member, the elastic member can return the piston to its initial position, keeping the gap between the brake pad and the brake disc within a reasonable range. This eliminates the need to use electrical control to find the point where the clamping force becomes zero, reducing the burden of electrical control hardware and calculations and reducing the overall cost of the electronic dry brake.

[0020] 2) During the braking and clamping process, when the main motor is cut off and becomes ineffective, the stored energy of the elastic member generates a force in the opposite direction, which can release the residual force caused by the cut off of the main motor.

[0021] 3) As brake wear progresses, the brake pads and brake discs wear out as the brake system operates. During the brake clamping process, when the elastic component reaches its maximum stored force, the position of the elastic component relative to the transmission component can change, allowing the position to self-adjust according to the wear of the brake pads and brake discs. This ensures that the gap between the brake pads and brake discs remains within a reasonable range during brake clamping, even if brake wear occurs. [Brief explanation of the drawings]

[0022] The contents of each drawing and the reference numerals in the drawings of the present specification will be briefly explained below. [Figure 1] FIG. 1 is a structural schematic diagram of Example 1 of the present invention. [Figure 2] FIG. 2 is an exploded view of the elastic member and the intermediate member of FIG. 1; [Figure 3] FIG. 2 is a structural schematic diagram of Example 2 of the present invention. [Figure 4] FIG. 4 is an exploded view of FIG. 3. [Figure 5] 5 is a schematic diagram showing a connection structure between the elastic member and the rear end cover in FIG. 4. [Figure 6] FIG. 1 is a structural schematic diagram of Example 3 of the present invention. [Figure 7] FIG. 7 is an exploded view of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0023] In order to make the purpose, technical means and advantages of the embodiments of the present invention clearer, the technical means in the embodiments are clearly and completely described in combination with the drawings in the examples of the present invention. The following examples are only for illustrating the present invention and do not limit the protection scope of the present invention.

[0024] In describing the present invention, it should be noted that directions or positional relationships indicated by terms such as "upper," "lower," "front," "rear," "left," "right," "vertical," "inner," and "outer" are directions or positional relationships based on the drawings, and are merely for the convenience and simplification of the description of the present invention, and do not explicitly or implicitly indicate that the subject devices or components have a specific orientation or must be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0025] In the description of the present invention, unless otherwise clearly specified or limited, the terms "attach," "connect," and "connect" should be interpreted broadly as meanings that can be understood by a person skilled in the art depending on the specific circumstances. For example, they may be fixedly connected, detachably connected, or integrally connected. They may also be mechanically connected or electrically connected. They may also be directly connected or indirectly connected via an intermediate medium.

[0026] 1 to 7, the present invention provides an electromechanical brake caliper that includes an actuator, a motion conversion mechanism 4, and a brake caliper body 5. The actuator includes a casing 1 and a motor 2 and a reduction gear mechanism 3 therein, and an output shaft of the motor 2 is connected to the brake caliper body 5 via the reduction gear mechanism 3 and the motion conversion mechanism 4.

[0027] Specifically, the reduction gear mechanism 3 includes a first output gear 3-1, a two-stage gear 3-2, and a second output gear 3-3. The two-stage gear 3-2 includes a large gear and a small gear arranged coaxially. The first output gear 3-1 is connected to the output shaft of the motor 2. The first output gear 3-1 is connected to the large gear and meshes with it. The small gear meshes with the second output gear 3-3, which is connected to the motion conversion mechanism 4. The motion conversion mechanism 4 includes a threaded shaft 4-1 connected to the second output gear 3-3. A threaded nut 4-2 is attached to the outer side of the threaded shaft 4-1 and connected to an inner pad 14. A caliper 15 is mounted on the brake caliper body 5, and an outer pad 16 is attached to the caliper. A brake disc 17 is provided between the outer pad 16 and the inner pad 14. The motor 2 is operated to rotate the threaded shaft 4-1. Then, by moving the screw nut 4-2 along the axial direction of the screw shaft 4-1, the inner pad 14 is brought close to the brake disc 17, and the inner pad 14 and the outer pad 16 clamp the brake disc 17, thereby achieving braking.

[0028] The electromechanical brake caliper further includes an elastic return mechanism that stores energy during the brake clamping process and returns components connected to the brake caliper body 5 during the brake release process. The elastic return mechanism is installed on the power transmission path of the brake caliper body 5, and the power transmission path includes at least one gear of the reduction gear mechanism 3, the motion conversion mechanism 4, or the brake caliper body 5.

[0029] The elastic return mechanism includes an installation space and an elastic member 8 and an intermediate member provided therein, and the elastic member 8 is connected to the transmission member of the reduction gear mechanism 3 or the motion conversion mechanism 4 via the intermediate member. The role of the intermediate member is to cause the elastic member 8 to be compressed and stored in energy in accordance with the operation of the transmission member of the reduction gear mechanism 3 or the motion conversion mechanism 4 when the brake clamp is applied, and when the brake clamp is released, the compressed and stored elastic member 8 returns the transmission member. The role of the installation space is to provide space for the installation of the elastic member 8 and the intermediate member, while restricting the return of the elastic member 8 to its initial position.

[0030] Furthermore, the driving force generated when the transmission member operates must overcome not only the frictional force between the intermediate member and the transmission member, but also the pressing force of the inner pad 14 against the lead nut 4-2 and the untwisting of the gears in the reduction gear mechanism 3. Therefore, the driving force generated when the transmission member operates is greater than the frictional force between the intermediate member and the transmission member, and the frictional force between the intermediate member and the transmission member is equal to the maximum stored force of the elastic member 8 and the supporting force of the mounting space for the intermediate member.

[0031] When the brake is clamped, the transmission member synchronously operates the intermediate member to compress and store the elastic member 8. Then, even after the elastic member 8 reaches its maximum stored force, the transmission member continues to operate and the intermediate member operates relative to the transmission member, so that the position of the intermediate member relative to the transmission member when the elastic member 8 is at its maximum stored force can be automatically adjusted. By operating the brake system in reverse, the gap between the brake pad and the brake disc can be returned to a reasonable gap range.

[0032] The present invention will be described in more detail with reference to the following examples. Example 1

[0033] As shown in FIGS. 1 and 2, a mounting space is provided on the inner wall of the brake caliper body 5. This mounting space is a first annular groove 6 that is open to the inside, and an intermediate member and an elastic member 8 are provided within the first annular groove 6. Both the intermediate member and the elastic member 8 have an annular structure, and the intermediate member is provided as a holding sleeve 7. The elastic member 8 is configured to be compressed axially to store energy and may include a wave spring, a columnar coil spring, or the like. The holding sleeve 7 is provided at one end of the first annular groove 6 away from the brake pads, and the elastic member 8 is provided at one end of the first annular groove 6 close to the brake pads. The elastic member 8 is fitted and connected to a lead nut 4-2, and the holding sleeve 7 is held and connected to the lead nut 4-2 of the motion conversion mechanism 4. The frictional force between the holding sleeve 7 and the lead nut 4-2 is constant. One end of the holding sleeve 7 is provided with a position-regulating boss 7-1 that is engaged and connected to the elastic member 8, allowing the elastic member 8 to be stably compressed and stored.

[0034] The method for assembling the intermediate member and elastic member 8 is as follows: First, place the elastic member 8 in the first annular groove 6, and place the holding sleeve 7 on one end of the elastic member 8 away from the brake pad. The elastic member 8 is compressed in its initial state to store initial energy, and the upper end surface of the holding sleeve 7 is brought into contact with the upper end surface of the first annular groove 6. After that, the motion conversion mechanism 4 is installed in the brake caliper body 5, and the outer wall surface of the screw nut 4-2 of the motion conversion mechanism 4 is held and connected to the inner wall surface of the holding sleeve 7.

[0035] The driving force generated when the lead screw nut 4-2 operates is the sum of the friction force between the holding sleeve 7 and the lead screw nut 4-2, the deformation force of the brake caliper body 15, and the pressing force of the inner pad 14 against the lead screw nut 4-2. The friction force between the holding sleeve 7 and the lead screw nut 4-2 is equal to the maximum stored force of the elastic member 8 against the holding sleeve 7 and the supporting force of the first annular groove 6 against the holding sleeve 7. Because the driving force generated when the lead screw nut 4-2 operates is greater than the friction force between the holding sleeve 7 and the lead screw nut 4-2, during brake clamping, the operation of the lead screw nut 4-2 causes the holding sleeve 7 to operate synchronously, pressing the elastic member 8 and storing energy.

[0036] Even after the elastic member 8 reaches its maximum stored force, the driving force continues to operate the lead screw nut 4-2, causing the holding sleeve 7 to operate relative to the transmission member, thereby adjusting the position of the holding sleeve 7 relative to the lead screw nut 4-2 (force equilibrium position) when the elastic member 8 is at its maximum stored force position. By operating the brake system in reverse to return the lead screw nut 4-2 to its original position, the gap between the brake pad and the brake disc can be returned to a reasonable gap range.

[0037] The operating principle of the elastic return mechanism having the above structure is as follows.

[0038] 1. Brake clamping process: When the brake pedal is depressed, the motor 2 rotates forward, and the reduction gear mechanism 3 rotates the screw shaft 4-1 of the motion conversion mechanism 4, causing the screw nut 4-2 to move in the axial direction of the screw shaft 4-1, gradually bringing the brake pad closer to the brake disc.

[0039] 1) When the clamping force has not reached the maximum clamping force, the frictional force between the holding sleeve 7 and the lead screw nut 4-2 is smaller than the driving force generated when the lead screw nut 4-2 operates, and therefore, at this time, the elastic member 8 also advances by the distance that the lead screw nut 4-2 advances.

[0040] 2) When the clamping force reaches the maximum clamping force, the lead screw nut 4-2 advances by the distance A, and at the same time, the holding sleeve 7 also advances by the distance A following the lead screw nut 4-2. At this time, the elastic member 8 is compressed and stored, reaches the maximum stored force, and maintains the state of being clamped with the maximum clamping force.

[0041] In the above states [1] and [2], the holding sleeve 7 does not slip relative to the lead nut 4-2.

[0042] 2. Brake release process: When the brake pedal is released, the motor 2 rotates in the reverse direction, moving the lead nut 4-2 along the axial direction of the lead shaft 4-1, gradually separating the brake pads from the brake disc. At this time, the lead nut 4-2 moves back by a distance A, and the holding sleeve 7 also moves back by the lead nut 4-2 by a distance A. At this time, the holding sleeve 7 contacts the upper end surface of the first annular groove 6 and maintains its initial position.

[0043] 3. When the brake disc and / or brake pads wear: As the brake pads and brake discs wear, the lead nut 4-2 advances further relative to the brake caliper body 5 by a distance B, which corresponds to the amount of wear. That is, when the maximum clamping force is reached at the amount of wear B, the lead nut 4-2 advances by a distance B + A from its initial position. The initial gap between the holding sleeve 7 and the lower end surface of the first annular groove 6 is the distance between the upper and lower end surfaces of the first annular groove 6, and is set as distance A during the initial design. After the lead nut 4-2 advances the holding sleeve 7 by the distance A, the holding sleeve 7 remains stationary. As the lead nut 4-2 advances further by the wear distance B, the holding sleeve 7 slides relative to the lead nut 4-2, adjusting the position of the holding sleeve 7 relative to the lead nut 4-2 when the elastic member 8 is fully energized (the force equilibrium position), thereby completing the self-adjustment of the holding sleeve 7 and achieving adjustment of the wear distance.

[0044] 4. When the motor 2 is powered off: During the brake clamping process, the motor 2 is powered off and deactivated, and the upward spring force of the elastic member 8 acts axially on the holding sleeve 7. This moves the holding sleeve 7 upward, moves the lead nut 4-2 upward, and returns the brake pad to its original position, releasing the brake disc from its holding state.

[0045] 5. When replacing brake pads: When the brake pads have worn down to their limit, they need to be replaced. At this time, the motor 2 can be reversed to return the lead nut 4-2 to its initial position. Due to the restriction of the upper end surface of the first annular groove 6, the holding sleeve 7 returns to its initial charge position and then stops, causing the lead nut 4-2 to move further upward. Once the lead shaft 4-1 has returned to its initial position, the brake pads can be replaced. Example 2

[0046] As shown in FIGS. 3 to 5, the casing body 1 includes a rear-end cover 1-1 provided to cover the surface of the reduction gear mechanism 3. The mounting space includes a positioning space for arranging the elastic member 8, which is formed between the rear-end cover 1-1 and the large gear of the double-stage gear 3-2. This positioning space includes a storage tank 10 provided in the rear-end cover 1-1. The elastic member 8 can be positioned within this storage tank 10, and the restriction of the double-stage gear 3-2 prevents the elastic member 8 from being pulled out. The elastic member 8 is provided as an elastic member 8 that is compressed circumferentially to store energy. The elastic member 8 is, for example, a coil spring. Two positioning posts 9 are provided within the storage tank 10, and both ends of the coil spring are connected to the rear-end cover 1-1 via the positioning posts 9 to maintain the initial stored energy.

[0047] The mounting space further includes a second annular groove 11 located at the center of the large gear of the double gear 3-2. The intermediate member includes an intermediate dial ring 12 that is held and connected to the inner pillar of the second annular groove 11. A pressing sleeve 13 is fitted to the inner pillar of the second annular groove 11 to ensure stable friction between the intermediate dial ring 12 and the inner pillar of the second annular groove 11. The inner wall of the pressing sleeve 13 is provided with a number of protrusions along the circumferential direction to ensure stable installation of the pressing sleeve 13. The pressing sleeve 13 and the intermediate dial ring 12 are held and connected. The friction between the pressing sleeve 13 and the intermediate dial ring 12 is stable.

[0048] The intermediate dial ring 12 extends outward in the circumferential direction to form a lever portion, which is abutted against one end of the coil spring. During brake clamping, the rotation of the two-stage gear 3-2 causes the pressing sleeve 13 and the intermediate dial ring 12 to rotate synchronously, and the lever portion presses against one end of the coil spring, continuously storing energy in the coil spring. Naturally, the pressing sleeve 13 may be removed as long as a stable friction force can be maintained between the intermediate dial ring 12 and the inner pillar of the second annular tank 11.

[0049] The intermediate member and elastic member 8 are assembled as follows. First, the coil spring is placed in the housing 10 on the rear end cover 1-1, and both ends of the coil spring are positioned by two positioning posts 9 inside the housing 10 so that the coil spring has initial stored energy in its initial state. As a result, when the gear rotates during brake clamping, the coil spring begins to store energy from the initial stored energy. After that, the pressing sleeve 13 and intermediate dial ring 12 are attached to the inner pillar of the second annular housing 11 in order from the inside to the outside, and the lever portion of the intermediate dial ring 12 is abutted and connected to the end of the coil spring closest to the center.

[0050] The torsional moment (torsion force) generated when the dual gear 3-2 rotates is equal to the sum of the friction force between the intermediate dial ring 12 and the pressing sleeve 13 (dual gear 3-2) and the torsional return moment (torsion return force) of the first output gear 3-1 and the second output gear 3-3 relative to the dual gear 3-2. The friction force between the intermediate dial ring 12 and the pressing sleeve 13 (dual gear 3-2) is equal to the maximum accumulated force of the elastic member 8 and the supporting force of the position regulating post 9 against the intermediate dial ring 12 (the gravity of the intermediate dial ring 12 is ignored).

[0051] The torsional moment generated when the dual gear 3-2 rotates is greater than the frictional force between the intermediate dial ring 12 and the pressure sleeve 13 (dual gear 3-2). Therefore, during brake clamping, the rotation of the dual gear 3-2 causes the intermediate dial ring 12 to operate synchronously, compressing and charging the coil spring. After the coil spring reaches its maximum charged force, the dual gear 3-2 continues to operate, causing the intermediate dial ring 12 to operate relative to the pressure sleeve 13, adjusting the position of the intermediate dial ring 12 relative to the dual gear 3-2 (force equilibrium position) when the coil spring is fully charged. When the brake system is reversed, the dual gear 3-2 rotates in the opposite direction, restoring the gap between the brake pad and brake disc to a reasonable range during brake clamping.

[0052] The operating principle of the elastic return mechanism having the above structure is as follows.

[0053] 1. Brake clamping process: In the initial state, the coil spring has an initial charge, and the lever part of the intermediate dial ring 12 is abutted and connected to the end of the coil spring closest to the center. During the brake clamping process, when the brake pedal is depressed, the motor 2 rotates forward, and the reduction gear mechanism 3 operates to operate the motion conversion mechanism 4, bringing the brake pads closer to the brake disc. At this time, the two-stage gear of the reduction gear mechanism 3 rotates, and the intermediate dial ring 12 rotates the coil spring, further charging it based on the initial charge.

[0054] 2. Brake release process: When the brake pedal is released, the motor 2 rotates in the reverse direction, gradually separating the brake pads from the brake disc. At this time, the two-stage gear 3-2 rotates in the reverse direction, and the intermediate dial ring 12 rotates in sync. Because the lever portion of the intermediate dial ring 12 is abutted (connected in contact) with the end of the coil spring close to the center, the coil spring releases its stored force, and when the end of the coil spring close to the center engages and connects with one of the position control posts 9, the coil spring returns to its initial stored position.

[0055] 3. When the brake disc and / or brake pad wear out: As the brake wears out, the brake pads and brake discs wear out as the brake system operates. At this time, in order to achieve brake clamping, the number of rotations of the double gear 3-2 relative to its initial position needs to be increased.

[0056] When the intermediate dial ring 12 pulls the coil spring and the coil spring reaches its maximum tension position, the two-stage gear 3-2 continues to rotate. At this time, relative rotation occurs between the intermediate dial ring 12 and the two-stage gear 3-2. The stroke of the relative rotation is the extra forward distance caused by wear, and can be used to adjust the maximum tension position of the coil spring when the brake is worn.

[0057] 4. When the motor 2 is de-energized: When the double gear 3-2 rotates clockwise, the intermediate dial ring 12 pulls the coil spring, further energizing the coil spring based on the initial energy. When the motor 2 is de-energized and deactivated, the stored force of the coil spring exerts a counterclockwise rotating force on the intermediate dial ring 12, causing the double gear 3-2 to rotate counterclockwise, releasing the residual force of the system, returning the brake pads to their original position, and releasing the brake disc from its holding state.

[0058] 5. When replacing brake shoes: When the brake pads have worn down to their limit, the vehicle's brake pads need to be replaced. At this time, the motor 2 can be reversed to rotate the two-stage gear 3-2 counterclockwise. When the intermediate dial ring 12 engages with the end of the coil spring closest to its center, the positioning post 9 on the rear end cover 1-1 fixes this end, preventing the intermediate dial ring 12 from rotating. This causes a relative rotation in the opposite direction between the two-stage gear 3-2 and the intermediate dial ring 12, returning it to its original position, allowing the brake shoes to be replaced. Example 3

[0059] 6 and 7, the difference from Example 2 is that the elastic return mechanism is provided in the second output gear 3-3, and the elastic member 8 is provided as an arc coil spring. That is, a cylindrical coil spring is processed to form an integral arc-shaped structure.

[0060] The mounting space includes a housing 10 provided on the second output gear 3-3 and a second annular housing 11 provided at the center of the second output gear 3-3. The second annular housing 11 and housing 10 are concentrically arranged, and an arc coil spring is disposed within the housing 10. Two position control posts 9 are provided on the rear end cover 1-1, and the two position control posts 9 abut and connect to both ends of the arc coil spring. An intermediate dial ring 12 is mounted within the second annular housing 11, and a pressing sleeve 13 may be mounted as in the mounting structure of Example 2.

[0061] The assembly method, operating principle, and effects of the above-mentioned elastic return mechanism are the same as those in the second embodiment, and therefore will not be described here.

[0062] Naturally, the present invention also protects an electromechanical brake caliper in which the elastic return mechanism of Example 2 or Example 3 is installed on the first output gear 3-1 or the output shaft of the motor 2. The present invention also protects an electromechanical brake caliper including all of the elastic return mechanisms of Examples 1, 2, and 3, or a combination of any two of these elastic return mechanisms.

[0063] While the principles of the present invention have been described by way of illustration, this specification is not intended to limit the invention to the specific construction and scope shown and described, and all available modifications and equivalents are therefore included within the scope of the present invention. [Explanation of symbols]

[0064] 1 Casing body 1-1 Rear cover 2 motors 3 Reduction gear mechanism 3-1 First output gear 3-2 Double gear 3-3 Second output gear 4. Motion conversion mechanism 4-1 Screw shaft 4-2 Screw nut 5 Brake caliper body 6. First annular tank 7 Holding Sleeve 7-1 Position Control Boss 8 Elastic member 9. Location Control Post 10 Containment Tank 11 Second annular tank 12 Intermediate dial ring 13 Pressing sleeve 14 Inner Pad 15 calipers 16 Outer pad 17 Brake disc

Claims

1. An actuator, a motion conversion mechanism, and a brake caliper body are included. The actuator includes a casing body and a motor and a reduction gear mechanism therein, and an output shaft of the motor is connected to a brake caliper body via the reduction gear mechanism and a motion conversion mechanism, The brake caliper further includes an elastic return mechanism that stores energy during the brake clamping process and returns the parts connected to the brake caliper body during the brake release process.

10. An electromechanical brake caliper, wherein the elastic return mechanism is provided on a power transmission path of the brake caliper body.

2. The elastic return mechanism includes a mounting space and an elastic member and an intermediate member provided therein.

2. The electromechanical brake caliper according to claim 1, wherein the elastic member is connected to a transmission member of the reduction gear mechanism or the motion conversion mechanism via an intermediate member.

3. The mounting space is provided on an inner wall of the brake caliper body, The mounting space is a first annular tank having an opening on the inside, 3. The electromechanical brake caliper according to claim 2, wherein the intermediate member is provided at one end of the mounting space away from the brake pad, and the intermediate member is held and connected to a threaded nut of the motion conversion mechanism, and the elastic member is matingly connected to the threaded nut.

4. the intermediate member is provided as a holding sleeve; 4. The electromechanical brake caliper according to claim 3, wherein one end of the holding sleeve is provided with a position-limiting boss for engaging and connecting with the elastic member.

5. 4. The electromechanical brake caliper according to claim 3, wherein the elastic member is provided as an elastic member that is compressed in an axial direction and stored with energy, and includes a wave spring and a cylindrical coil spring.

6. the casing body includes a rear end cover provided to cover a surface of the reduction gear mechanism, the mounting space includes a positioning space for disposing the elastic member; the positioning space is formed between the rear end cover and the reduction gear mechanism; 3. The electromechanical brake caliper according to claim 2, wherein both ends of the elastic member are connected to the rear end cover via position-regulating posts, respectively, to maintain the initial stored force.

7. 7. The electromechanical brake caliper according to claim 6, wherein the positioning space includes a receiving tank provided on at least one gear end surface of the reduction gear mechanism or on the rear end cover.

8. the mounting space further includes a second annular tank provided at the center of at least one gear of the reduction gear mechanism; the intermediate member includes an intermediate dial ring holdingly connected to an inner post of the second annular tank; 7. The electromechanical brake caliper according to claim 6, wherein the intermediate dial ring is abuttingly connected to one end of the elastic member.

9. A pressure sleeve is fitted to the inner pillar of the second annular tank, 9. The electromechanical brake caliper according to claim 8, wherein the pressure sleeve and the intermediate dial ring are connected by a holding connection.

10. The electromechanical brake caliper according to claim 9, wherein the inner wall of the pressing sleeve is provided with a plurality of protrusions along the circumferential direction.

11. 9. The electromechanical brake caliper according to claim 8, wherein the intermediate dial ring extends outward in a circumferential direction to form a lever portion, the lever portion being abuttingly connected to one end of the elastic member.

12. 7. The electromechanical brake caliper according to claim 6, wherein the elastic member is provided as an elastic member that is compressed in a circumferential direction and stores energy, and includes a coil spring and an arc coil spring.

13. 2. The electromechanical brake caliper according to claim 1, wherein the power transmission path includes at least one gear of the reduction gear mechanism, the motion conversion mechanism, or the brake caliper body.

14. the reduction gear mechanism includes a first output gear, a two-stage gear, and a second output gear; The two-stage gear includes a large gear and a small gear arranged coaxially, the first output gear is connected to an output shaft of the motor, and the first output gear is connected in mesh with the large gear; 2. The electromechanical brake caliper according to claim 1, wherein the small gear meshes with the second output gear, and the second output gear is connected to a motion conversion mechanism.

15. the motion conversion mechanism includes a screw shaft connected to the second output gear, A screw nut is attached to the outside of the screw shaft, The screw nut is connected to an inner pad; A caliper is provided on the brake caliper body, An outer pad is attached to the caliper, A brake disc is provided between the outer pad and the inner pad, The electromechanical brake caliper according to claim 14, wherein the motor rotates the threaded shaft to move the threaded nut along the axial direction of the threaded shaft.

16. A braking system comprising an electromechanical brake caliper according to any one of claims 1 to 15.

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