Motion conversion structure and brake caliper assembly with same

Abstract

The invention relates to the field of brake calipers, in particular to a motion conversion structure and a brake caliper assembly with the motion conversion structure, and the motion conversion structure comprises a lead screw shaft, a ball and a translation mechanism; the balls are arranged in an area between the lead screw shaft and the translation mechanism; the motion conversion structure further comprises a return structure; the reversing structure is arranged on the lead screw shaft; the reversing structure is arranged on the lead screw shaft, so that the axial size of the lead screw shaft can be smaller than the axial size of the nut, the first bearing is arranged on one side of the lead screw shaft, the radial space of the first bearing can be increased, the axial size can be reduced, and therefore the axial size of the caliper assembly is reduced; and the internal space of the motion conversion structure is fully utilized.

Description

Technical Field

[0001] The invention relates to the field of brake calipers, in particular to a motion conversion structure and a brake caliper assembly having the motion conversion structure. Background Art

[0002] At present, the mainstream braking solution in the automotive market is the traditional hydraulic braking system. With the development of automotive intelligence, it is a general trend to replace the hydraulic braking system with the electronic mechanical braking system (EMB). It has a simpler system structure and is easy to maintain. It uses wires instead of hydraulic pipelines and realizes the transmission from pedal signals to actuators through electronic signals. It has the characteristics of fast response, high efficiency, small size and light weight.

[0003] The common linear element of the EMB motion conversion structure is the ball screw, which can convert the torque and speed input by the motor into the linear motion of the piston to achieve caliper braking.

[0004] Since the threads of the ball screw nut and the screw are both unidirectional, non-closed spiral curves, the balls cannot circulate on the raceway, so a return device needs to be installed. The return device can provide a closed channel for the balls to circulate on the raceways of the nut and the screw, allowing the balls to circulate in a channel. It can be said that the ball screw mechanism is the key to the EMB motion conversion, and the return device is the key to the operation of the ball screw mechanism.

[0005] There are many types of return devices for ball screws, all of which have the function of connecting the two ends of the ball circulation to form a closed loop.

[0006] At present, the common structure of the ball screw used in the EMB system is that the return device is arranged on the nut. For example, as disclosed in Patent 202222303249.2 - A brake caliper, the traditional structure nut is a translation part, the screw is a rotating part, and the motion cycle of the ball is an internal cycle. Although this arrangement can realize the closed-loop circulation of the ball, the nut will move in a straight line. In order to prevent the steel ball from falling off, the length of the screw must be at least greater than the sum of the linear stroke of the nut and the length of the ball closed-loop raceway, so the size of the screw will be too large.

[0007] Therefore, in order to improve or solve at least one of the above problems, it is necessary to optimize the design of the existing caliper assembly. Summary of the invention

[0008] The object of the present invention is to provide a motion conversion structure for a caliper assembly which can reduce the axial dimension of a screw shaft.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is:

[0010] A motion conversion structure comprises a screw shaft, a ball, and a translation mechanism; the ball is arranged in the area between the screw shaft and the translation mechanism;

[0011] The motion conversion structure also includes a return structure; the return structure is arranged on the screw shaft.

[0012] The screw shaft is provided with an external threaded raceway for ball circulation; the screw shaft is provided with a return structure; the return structure can at least connect adjacent external threaded raceways to form a closed-loop circulation raceway; the return structure is designed to be integrated with the screw shaft or separately.

[0013] The return structure comprises an upward threaded raceway arranged on the screw shaft, and the upward threaded raceway is used to connect two adjacent threaded raceways.

[0014] The return structure comprises a mounting groove arranged on the screw shaft, a return device is arranged in the mounting groove, and an upward threaded raceway is arranged in the return device; the upward threaded raceway on the return device is used to connect two adjacent threaded raceways.

[0015] The screw shaft includes a shaft body, on which an avoidance groove is provided; the avoidance groove includes a lower avoidance groove and an upper avoidance groove arranged on the shaft body, and the lower avoidance groove and the upper avoidance groove are distributed at both ends of the shaft body.

[0016] The translation mechanism comprises a nut and a base; the nut is connected to the brake pad through the base;

[0017] A positioning structure is provided between the screw shaft and the base; the positioning structure comprises a base zero position boss arranged on the base and a screw positioning platform arranged at the end of the screw shaft, and the outer side surface of the base zero position boss close to the screw positioning platform is an arc surface.

[0018] The nut and the base in the translation mechanism are designed to be split.

[0019] A brake caliper assembly, comprising a brake caliper, a brake pad and an actuator, wherein the brake caliper comprises a caliper body; at least one set of the motion conversion structure is provided in the caliper body;

[0020] The motion conversion structure can convert the rotational motion into linear motion so that the brake pad can move linearly;

[0021] The actuator controls the rotation of the screw shaft; the screw shaft can drive the translation mechanism to perform linear motion through the ball bearings.

[0022] A cylinder hole is provided in the caliper body; the motion conversion structure is inserted in the cylinder hole; the actuator controls the operation of the motion conversion structure through the transmission shaft; the transmission shaft includes a transmission shaft body, and a transmission end block is provided on the transmission shaft body; the transmission end block is inserted in the upper avoidance groove.

[0023] A positioning groove is provided in the upper avoidance groove of the screw shaft, and the positioning groove includes a calibration groove and an arc groove, the calibration groove extends from the upper avoidance groove to the lower avoidance groove; the arc groove extends from the calibration groove to the lower avoidance groove.

[0024] The transmission end block comprises an end block body, on which an adjusting piece is arranged; one end of the adjusting piece is plugged into the end block body, and the other end is plugged into the position adjustment sink; the adjusting piece is movably connected with the end block body and the lead screw shaft;

[0025] The adjusting member comprises a middle section and spherical surfaces arranged at both ends of the middle section; the end block body is also provided with an adjusting groove; one end of the adjusting member is arranged in the adjusting groove on the end block body, and the other end is arranged in the adjusting groove of the screw shaft.

[0026] A pre-tightening mechanism is provided between the transmission shaft and the screw shaft; the pre-tightening mechanism includes a retaining ring; an annular embedding groove is provided on the inner wall of the upper avoidance groove on the screw shaft, and the retaining ring is embedded in the annular embedding groove and overlapped on the transmission shaft.

[0027] The transmission end block is provided with an annular recessed groove; the retaining ring is overlapped on the transmission end block.

[0028] The pre-tightening mechanism also includes an elastic component; the elastic component includes one or more of a disc spring, a wave spring and a top-to-top wave spring; the retaining ring is overlapped on the transmission shaft through the elastic component.

[0029] The pre-tightening mechanism also includes a gasket; the retaining ring is connected to the elastic component through the gasket.

[0030] The advantages of the present invention are:

[0031] The invention discloses a motion conversion structure and a brake caliper assembly having the motion conversion structure.

[0032] The present invention arranges the return structure on the screw shaft so that the axial dimension of the screw shaft can be smaller than the axial dimension of the nut. The first bearing is arranged on one side of the screw shaft, the radial space of the first bearing will be increased, and the axial dimension can be reduced, thereby reducing the axial dimension of the caliper assembly and making full use of the space inside the motion conversion structure.

[0033] In the brake caliper assembly disclosed in the present invention, the return structure is arranged on the screw shaft, which can reduce the axial size of the brake caliper assembly, and the stability of the connection between the transmission shaft and the screw shaft can be ensured by setting the pre-tightening mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0035] Figure 1 This is the brake caliper assembly disclosed in Embodiment 3 of the present invention.

[0036] Figure 2 It is a structural schematic diagram of the translation mechanism in the present invention.

[0037] Figure 3 It is a bottom view of the base in the present invention.

[0038] Figure 4 It is a top view of the base in the present invention.

[0039] Figure 5 It is a cross-sectional view of the base in the present invention.

[0040] Figure 6 for Figure 5 A partial enlarged view of .

[0041] Figure 7 It is a structural schematic diagram of the translation mechanism in the second embodiment of the present invention.

[0042] Figure 8 The present invention discloses a brake caliper assembly according to the first embodiment of the present invention.

[0043] Fig. 9 It is a schematic diagram of the structure when a return structure is provided on the screw shaft of the present invention.

[0044] Fig.10 It is a structural schematic diagram of the pre-tightening mechanism in the present invention when a retaining ring and a disc spring cooperate with each other.

[0045] Fig.11 It is a schematic diagram of the structure when the pre-tightening mechanism in the present invention adopts a retaining ring, a gasket and a wave spring.

[0046] Fig.12 It is a structural schematic diagram of the pre-tightening mechanism of the present invention when a retaining ring and a top-to-top wave spring cooperate with each other.

[0047] Fig.13 This is the brake caliper assembly disclosed in Embodiment 6 of the present invention.

[0048] The marks in the above figure are:

[0049] 1. Actuator; 2. Caliper body; 2-1. Cylinder hole; 3. Caliper body bushing; 4. Transmission shaft; 4a. Torque transmission shaft; 4b. Flange sleeve; 41. Transmission shaft body; 42. Transmission end block; 43. Annular sink groove; 44. Adjustment member; 441. Intermediate section; 442. Spherical surface; 5. First bearing; 6. Preload mechanism; 6a. Snap ring; 6b. Double-layer snap ring; 6c. Disc spring; 6d. Gasket; 6e. Wave spring; 6f. Top wave spring; 7. Motion conversion structure ; 7a, screw shaft; 7a-1, return mechanism, 7-1, adjustment groove, 7a1, annular embedment, 7a2, upper avoidance groove; 7a3, lower avoidance groove; 7a4 calibration groove; 7a5 arc groove; 7a6, screw positioning platform; 7b, nut; 8, base; 81 base; 82 side ring seat, 8a, base positioning groove, 8b, base zero position boss; 8c, positioning surface, 9, dust cover; 10, inner friction plate; 11, brake disc; 12, outer brake pad. DETAILED DESCRIPTION

[0050] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0051] A motion conversion structure comprises a screw shaft, a ball, and a translation mechanism; the ball is arranged in the area between the screw shaft and the translation mechanism; the motion conversion structure also includes a return structure; the return structure is arranged on the screw shaft; the present invention arranges the return structure on the screw shaft so that the axial dimension of the screw shaft can be smaller than the axial dimension of the nut, and the first bearing is arranged on one side of the screw shaft, the radial space of the first bearing will increase, and the axial dimension can be reduced, thereby reducing the axial dimension of the caliper assembly and making full use of the space inside the motion conversion structure.

[0052] In the present invention, the return structure 7a-1 is mainly used for the circulating rolling of balls. In the present invention, the return structure 7a-1 is arranged on the screw shaft 7a; based on such a setting, the steel balls circulate on the raceway of the screw shaft 7a through the return structure 7a-1.

[0053] When the return structure 7a-1 is arranged on the screw shaft 7a, the return structure 7a-1 is provided on the external threaded raceway where the steel balls of the screw shaft 7a circulate; the return structure 7a-1 is realized by machining or installing a return device; through the movement of the return structure 7a-1 on the screw shaft 7a, the axial length of the screw shaft 7a can be less than the axial length of the nut 7b during subsequent use.

[0054] By arranging the return structure 7a-1 on the screw shaft 7a, the axial dimension of the screw shaft 7a can be smaller than the axial dimension of the nut 7b, which saves material on the one hand, and on the other hand, the screw shaft 7a is arranged in parallel with the first bearing 5, which saves the wall thickness of the screw shaft 7a in the radial direction, and the radial arrangement space of the first bearing 5 is larger. The first bearing 5 can be made larger and can carry a larger load; or the size of the first bearing 5 is not changed, the radial dimension of the screw shaft 7a is reduced, and the screw shaft 7a can be made smaller; thereby reducing the axial dimension of the caliper assembly and making full use of the space inside the screw shaft 7a.

[0055] Furthermore, in the present invention, a return device is installed on the screw shaft 7a or a return track structure is directly processed, and the balls form a closed-loop circulation raceway through the return structure 7a-1.

[0056] Specifically, in the present invention, an external threaded raceway for ball circulation is provided on the screw shaft; the external threaded raceway 7a01 is generally designed with a downward rotating raceway structure; and in the present invention, a return structure is provided on the screw shaft; the return structure can at least connect adjacent external threaded raceways 7a01 to form a closed-loop circulation raceway; based on such a setting, the circulating rolling operation of the balls can be realized.

[0057] In the present invention, the return structure is designed as an integral part or a separate part with the screw shaft; the integral design generally means that the return structure is directly arranged on the screw shaft, for example, an upward threaded raceway 7a-11 is directly arranged on the screw shaft in the following text.

[0058] The split design generally means that a return device is added to the screw shaft, and the connection and communication of adjacent thread raceways are achieved through the upward thread raceways 7a-11 on the return device.

[0059] The above two design methods have specific technical effects respectively. Directly processing the return structure on the screw shaft can ensure the integrity of the return structure and the screw shaft and simplify the subsequent installation process. Then setting up a return device can reduce the difficulty of processing the return structure and improve the processing efficiency of the return device.

[0060] Specifically, the return structure in the present invention includes an upward threaded raceway 7a-11 arranged on the screw shaft, and the upward threaded raceway 7a-11 is used to connect two adjacent threaded raceways 7a01; the above-mentioned design of the present invention directly processes the corresponding upward threaded raceway 7a-11 on the screw shaft; thereby, the connection and communication between adjacent threaded raceways can be achieved, so that the two threaded raceways and the upward threaded raceway 7a-11 form a closed-loop circulation raceway; thereby, the cyclic rolling of the balls is achieved.

[0061] In the present invention, the return structure includes a mounting groove arranged on the screw shaft, a return device is arranged in the mounting groove, and an upward threaded raceway 7a-11 is arranged in the return device; the upward threaded raceway 7a-11 on the return device is used to connect two adjacent threaded raceways; the return device is essentially a shell structure with a semicircular cross-section, and the upward threaded raceway 7a-11 thereon plays a good connecting and communicating role, thereby forming a closed-loop circulation raceway; for the convenience of subsequent use, the ball can circulate in the closed-loop circulation raceway.

[0062] In addition, the upward and downward in the above description are based on the drawings; the upward and the upward and the downward do not have a specific limiting meaning.

[0063] Furthermore, in the present invention, the translation mechanism mainly includes a nut 7b and a base 8, and the nut 7b and the base 8 are designed in a split manner. In the present invention, the base 8 acts as a piston structure through the split design of the base 8 and the nut 7b. In subsequent use, the size of the nut 7b can be reduced, thereby reducing the radial size of the cylinder hole 2-1. At the same time, in subsequent use, the size and model of the base 8 can be changed as needed, thereby improving the scope of application of the present invention to a certain extent.

[0064] The translation mechanism disclosed in the present invention is essentially the translation part in the motion conversion structure 7; the translation mechanism disclosed in the present invention mainly includes the nut 7b, and the nut 7b is the translation part in the screw shaft 7a mechanism. When in use, the rotation of the screw shaft 7a drives the nut 7b to move through the ball, thereby facilitating the change of the position of the inner brake pad 10 in subsequent use.

[0065] In addition, in the present invention, the nut 7b is connected to the base 8, and the base 8 is equivalent to a piston structure. Subsequently, under the premise that the actuator 1 drives the screw shaft 7a to rotate, the base 8 can perform linear motion along its axial direction, thereby realizing the change of the position of the inner brake pad 10, and finally making the inner brake pad 10 and the outer brake pad 12 move linearly relative to the brake disc 11 in a direction parallel to the axial direction of the brake disc 11 to clamp or loosen the brake disc 11.

[0066] In the present invention, the nut 7b and the base 8 are designed to be split; such a configuration allows the nut 7b and the base 8 to be selected in corresponding models and sizes as needed, thereby making the translation mechanism disclosed in the present invention suitable for brake pads of different models.

[0067] In addition, in the present invention, the nut 7b is arranged in the cylinder hole 2-1 of the caliper body 2, and the nut 7b is connected to the inner brake pad 10 through the base 8. In subsequent use, the movement of the nut 7b can drive the movement of the base 8, thereby driving the movement of the inner brake pad 10.

[0068] Furthermore, in the present invention, the nut 7b includes a nut body; the nut body is the main structure of the nut 7b, and in the present invention, the base 8 includes a base 81; a side ring seat 82 is provided on the base 81; the base 81 is a basic plate structure, and the side ring seat 82 is arranged at the periphery of the base 81, and the side ring seat 82 is an annular seat structure. When in use, the base 8 is conveniently sleeved on the nut 7b through the side ring seat 82, thereby realizing the connection between the nut 7b and the base 8.

[0069] In addition, in the present invention, the nut 7b is connected to the base 8 through a connecting mechanism; the setting of the connecting mechanism in the present invention facilitates the connection between the nut 7b and the base 8; the connection method can be an interference fit socket connection, or it can be connected by welding, screw connection and other connection methods.

[0070] In the present invention, the connecting mechanism includes a sleeve ring groove 7b1 arranged at the end of the nut body; the base 8 is sleeved on the sleeve ring groove 7b1 of the nut body through a side ring seat; the present invention forms a stepped platform on the outer side of the nut body through the setting of the sleeve ring groove 7b1, which facilitates the mutual positioning of the nut 7b and the base 8 during installation.

[0071] Furthermore, in the present invention, a side fixing groove is provided on the side ring seat 82; the side fixing groove forms a positioning surface 8c on the inner wall of the side ring seat 82; the side fixing groove forms a plane on the inner wall of the side ring seat 82, that is, the above-mentioned positioning surface 8c is formed. The existence of the positioning surface 8c can not only ensure the positioning of the base 8 and the nut 7b during installation, but also has a certain anti-rotation ability.

[0072] Furthermore, in the present invention, the positioning surface 8c is inclined; based on such a setting, it is equivalent to having an inclined surface on the inner wall of the side ring seat 82, so that the side ring seat 82 is surrounded by a groove body with a large opening at the upper end and a small opening at the lower end; thereby facilitating the sleeve installation of the base 8 on the nut 7b.

[0073] Furthermore, in the present invention, a base positioning groove 8a is provided on the side of the base 81 away from the nut 7b; the base positioning groove 8a can control the position and orientation of the base 81 during subsequent assembly, thereby ensuring the installation and placement position of the base 8.

[0074] In the present invention, the shape, structure and number of the base positioning groove 8a can be selected as needed, and it is mainly necessary to cooperate with the positioning member to control the placement position of the base 8. Generally, three base positioning grooves 8a can be set, and the three base positioning grooves 8a are distributed in a herringbone shape; of course, other arrangements can also be used.

[0075] A motion conversion structure 7 includes a screw shaft 7a, balls and the translation mechanism; the balls are arranged in the area between the screw shaft 7a and the translation mechanism; the motion conversion structure 7 disclosed in the present invention can convert rotational motion into linear motion so that the brake pad connected to the motion conversion structure 7 can perform linear motion; and realize the clamping and releasing operations of the caliper during actual use.

[0076] In the present invention, the screw shaft 7a disclosed in the present invention is connected with the transmission shaft 4, and the transmission shaft 4 can drive the screw shaft 7a to rotate. Under the transmission of the ball, the screw shaft 7a has a tendency to drive the translation mechanism to rotate, but because of the setting of the upper limit mechanism between the nut 7b and the inner wall of the cylinder hole 2-1, the nut 7b cannot rotate. Under the action of the rotational force applied by the screw shaft 7a, the nut 7b will move linearly along the axial direction of the screw shaft 7a, thereby realizing the driving of the base 8 by the nut 7b, and then realizing the movement of the base 8 connected to the brake pad.

[0077] Furthermore, the screw shaft 7a described in the present invention includes a shaft body, which is the main structure of the screw shaft 7a, and an avoidance groove is provided on the shaft body in the present invention; the avoidance groove is an inner groove structure; it facilitates the matching connection between the screw shaft 7a and the transmission shaft 4, and also facilitates the arrangement of the positioning structure on the screw shaft 7a.

[0078] Specifically, the avoidance groove in the present invention includes a lower avoidance groove 7a3 and an upper avoidance groove 7a2 arranged on the shaft body, and the lower avoidance groove 7a3 and the upper avoidance groove 7a2 are distributed at both ends of the shaft body; one function of the lower avoidance groove 7a3 and the upper avoidance groove 7a2 is to reduce the weight of the screw shaft 7a. In addition, in the present invention, the upper avoidance groove 7a2 is mainly to facilitate the plug-in installation of the transmission shaft 4 at the end of the screw shaft 7a, and the lower avoidance groove 7a3 is used for the setting and installation of the screw positioning platform 7a6.

[0079] Furthermore, in the present invention, a positioning structure is provided between the screw shaft 7a and the base 8; the positioning structure serves as an installation calibration function.

[0080] Specifically, the positioning structure in the present invention includes a base zero position boss 8b arranged on the base 8 and a screw positioning platform 7a6 arranged at the end of the screw shaft 7a. In the present invention, the base zero position boss 8b and the screw positioning platform 7a6 play a mutual calibration role to ensure mutual calibration between the screw shaft 7a and the base 8 during installation.

[0081] At the same time, in the present invention, the outer side surface of the base zero position boss 8b close to the screw positioning platform 7a6 is an arc surface; such a setting can avoid affecting the normal rotation of the screw shaft 7a due to the setting of the base zero position boss 8b and the screw positioning platform 7a6.

[0082] A brake caliper assembly includes a brake caliper, a brake pad and an actuator 1, wherein the brake caliper includes a caliper body 2; at least one set of motion conversion structures 7 is provided in the caliper body 2; the motion conversion structure 7 can convert rotational motion into linear motion so that the brake pad performs linear motion; the actuator 1 controls the rotation of a lead screw shaft 7a; the lead screw shaft 7a can perform linear motion by driving a translation mechanism through a ball bearing.

[0083] The brake caliper assembly disclosed in the present invention is mainly a floating caliper assembly.

[0084] Specifically, the brake caliper assembly disclosed in the present invention mainly includes a brake caliper, a brake pad and an actuator 1. The brake caliper is the main structure of the brake caliper assembly, and the actuator 1 includes an input element, a controller and a transmission shaft 4. The actuator 1 is mainly used to drive the screw shaft 7a to rotate. Therefore, when in use, the actuator 1 can be used in the present invention as long as it can drive the screw shaft 7a to rotate.

[0085] At the same time, in the present invention, the brake pad is a brake pad, which is generally divided into an inner brake pad 10 and an outer brake pad 12 based on the different layout positions, and is respectively arranged on the opposite sides of the brake disc 11. Subsequently, the inner brake pad 10 and the outer brake pad 12 clamp and rub the brake disc 11 to achieve the braking operation of the brake disc 11.

[0086] In addition, in the present invention, the motion conversion structure 7 is a planetary ball screw shaft 7a mechanism.

[0087] In the present invention, the motion conversion structure 7 includes a screw shaft 7a, a nut 7b and a ball, wherein the nut 7b is sleeved on the screw shaft 7a, and the ball is arranged in the area between the nut 7b and the screw shaft 7a; the actuator 1 controls the rotation of the screw shaft 7a; the screw shaft 7a can drive the nut 7b to perform linear motion through the ball; the actuator 1 is connected to the screw shaft 7a through the transmission shaft 4, and the screw shaft 7a rotates under the drive of the transmission shaft 4; at this time, the screw shaft 7a is a rotating part; and the nut 7b is a translational part.

[0088] At the same time, the brake caliper described in the present invention includes a caliper body 2; the caliper body 2 is the main structure of the brake caliper, generally referring to the structure above the hook; in the present invention, at least one set of motion conversion structures 7 that can convert rotational motion into linear motion so that the brake pad can perform linear motion is provided in the caliper body 2; based on such statements, it can be known that; the present invention can realize the use of brake caliper assemblies with specific different cylinders, such as a dual-cylinder brake caliper assembly, etc., by setting different numbers of motion conversion structures 7.

[0089] In addition, in order to ensure the linearity of the movement of the nut 7b, the cylinder hole 2-1 is required to be connected to the nut 7b in the motion conversion structure 7 through a limiting mechanism; the setting of the limiting mechanism facilitates the limitation of the rotation of the nut 7b.

[0090] At the same time, the limiting mechanism described in the present invention includes a boss or a groove provided on the nut 7b, and the inner wall of the cylinder hole 2-1 is provided with a groove or a boss corresponding to the boss or groove on the nut 7b; based on the above, when a boss is provided on the nut 7b, a groove is provided on the inner wall of the cylinder hole 2-1, and the nut 7b is inserted into the groove through the boss. Similarly, when a groove is provided on the nut 7b, a boss is provided on the inner wall of the cylinder hole 2-1. Based on such a setting, the rotation limitation of the nut 7b in the cylinder hole 2-1 is realized.

[0091] Furthermore, in the present invention, a cylinder hole 2-1 is provided in the caliper body 2; the motion conversion structure 7 is inserted in the cylinder hole 2-1; the actuator 1 controls the operation of the motion conversion structure 7 through the transmission shaft 4; the setting of the cylinder hole 2-1 is equivalent to forming an inner cavity structure in the caliper body 2, which facilitates the installation and arrangement of the motion conversion structure 7 in the caliper body 2.

[0092] Furthermore, the brake caliper assembly in the present invention also includes a bearing mechanism; in the invention, the bearing mechanism plays a good supporting and limiting role, mainly used to bear the reverse thrust of the brake clamping force during subsequent use.

[0093] Specifically, the bearing mechanism in the present invention includes a first bearing 5 arranged on the screw shaft 7a; the first bearing 5 can be a thrust needle bearing; in actual arrangement, the first bearing 5 is arranged at the end of the screw shaft 7a or in the upper avoidance groove 7a2.

[0094] Furthermore, in the present invention, a positioning groove 7 - 1 is provided in the upper avoidance groove 7 a 2 of the screw shaft 7 a . The positioning groove 7 - 1 is mainly used in conjunction with the protrusion at the end of the transmission shaft 4 .

[0095] In addition, in the present invention, the positioning groove 7-1 includes a calibration groove 7a4 and an arc groove 7a5. The calibration groove 7a4 extends from the upper avoidance groove 7a2 to the side of the lower avoidance groove 7a3; the arc groove 7a5 extends from the calibration groove 7a4 to the side of the lower avoidance groove 7a3; a stepped groove structure is formed by the upper avoidance groove 7a2, the calibration groove 7a4 and the arc groove 7a5. Such an arrangement can not only ensure the installation and positioning of the transmission shaft 4 on the screw shaft 7a, but also avoid large deflection of the screw shaft 7a during use.

[0096] Furthermore, in the present invention, the transmission shaft 4 includes a transmission shaft body 41, and a transmission end block 42 is provided on the transmission shaft body 41; the transmission end block 42 is inserted into the upper avoidance groove 7a2; the transmission shaft body 41 is the main structure of the transmission shaft 4, and the transmission end block 42 is a raised block structure, so that the transmission shaft 4 has a raised portion, which is convenient for subsequent use. There are multiple positioning points between the transmission shaft 4 and the screw shaft 7a, which better ensures the contact area between the transmission shaft 4 and the screw shaft 7a, thereby better ensuring the stability and accuracy of the connection between the transmission shaft 4 and the screw shaft 7a.

[0097] In addition, in the present invention, the outer diameter of the end block body is larger than the outer diameter of the transmission shaft body 41 , so that the end block body and the transmission shaft body 41 form an inverted T-shaped structure.

[0098] Furthermore, in the present invention, the transmission end block 42 includes an end block body, which is the main structure of the transmission end block 42, and an adjusting piece 44 is provided on the end block body; one end of the adjusting piece 44 is inserted into the end block body, and the other end is inserted into the positioning groove 7-1; the adjusting piece 44 is movably connected with the end block body and the screw shaft 7a; the adjusting piece 44 is inserted into the end block body and the screw shaft 7a; at the same time, in the present invention, the adjusting piece 44 includes an intermediate section 441 and spherical surfaces 442 arranged at both ends of the intermediate section 441; a positioning groove 7-1 is also provided on the end block body; one end of the adjusting piece 44 is arranged in the positioning groove 7-1 on the end block body, and the other end is arranged in the positioning groove 7-1 of the screw shaft 7a; based on such a setting, the present invention makes the adjusting piece 44, the end block body and the screw shaft 7a form a double spherical sub-mechanism.

[0099] The adjusting member 44 has a centering function to eliminate the influence of the braking tangential force on the transmission shaft 4 .

[0100] In the present invention, the transmission end block 44 includes an end block body and an adjusting member 44; in the present invention, according to actual production needs, the end block body and the adjusting member 44 can be required to be an integrated structure, or they can have a split design similar to the above, and the specific design method can be selected according to the working conditions.

[0101] Furthermore, in the present invention, a pre-tightening mechanism 6 is provided between the transmission shaft 4 and the screw shaft 7a; by providing the pre-tightening mechanism 6, the present invention can better ensure the stability of the connection between the transmission shaft 4 and the screw shaft 7a.

[0102] At the same time, the pre-tightening mechanism 6 in the present invention includes a retaining ring 6a; an annular groove 7a1 is provided on the inner wall of the upper avoidance groove 7a2 on the screw shaft 7a, and the retaining ring 6a is embedded in the annular groove 7a1 and overlapped on the transmission shaft 4; the retaining ring 6a plays a longitudinal limiting role to prevent the screw shaft 7a from disengaging from the transmission shaft 4.

[0103] The annular embedding groove 7a1 is arranged on the inner wall of the upper avoidance groove 7a2.

[0104] Furthermore, in the present invention, an annular groove 43 is provided on the transmission end block 42; the retaining ring 6a is overlapped on the transmission end block 42; the annular groove 43 is arranged on the side of the transmission end block 42, and the annular groove 43 forms a step on the transmission end block 42, which facilitates the overlap of the retaining ring 6a on the transmission end block 42.

[0105] At the same time, the retaining ring 6a can also be selected as a double-layer retaining ring 6b.

[0106] Furthermore, the pre-tightening mechanism 6 in the present invention further includes an elastic component; the present invention can provide installation pre-tightening force for the transmission shaft 4 and the screw shaft 7a through the provision of the elastic component.

[0107] In addition, the elastic component in the present invention includes one or more of a disc spring 6c, a wave spring 6e and a top wave spring 6f; the retaining ring 6a is overlapped on the transmission shaft 4 through the elastic component; the disc spring 6c, the wave spring 6e and the top wave spring 6f in the present invention generate elastic potential energy through their own deformation, so that there is a stable installation preload between the transmission shaft 4 and the screw shaft 7a.

[0108] Furthermore, in the present invention, the pre-tightening mechanism 6 also includes a gasket 6d; the retaining ring 6a is connected to the elastic component through the gasket 6d; the gasket 6d plays a good blocking role, and the gasket 6d is generally used in conjunction with the wave spring 6e. The retaining ring 6a provides positioning, and the gasket 6d prevents the wave spring 6e from escaping from the retaining ring 6a and causing the pre-tightening mechanism 6 to fail. The wave spring 6e is used to provide a pre-tightening force, and the current manufacturing process of the wave spring 6e is relatively complete, and the size of the pre-tightening force is controllable.

[0109] Furthermore, in the present invention, the side of the base 8 is connected to the caliper body 2 via a dust cover 9; one end of the dust cover 9 is connected to the caliper body 2, and the other end is connected to the base 8; thereby ensuring the sealing of the brake caliper.

[0110] Furthermore, in the present invention, the transmission shaft 4 and the screw shaft 7a are connected via a spline mechanism; the provision of the spline mechanism in the present invention facilitates the connection between the transmission shaft 4 and the screw shaft 7a, and facilitates the rotation of the transmission shaft 4 to stably drive the screw shaft 7a to rotate.

[0111] specific:

[0112] The present invention discloses a brake caliper assembly, which mainly includes an actuator 1, a brake caliper, and a motion conversion structure 7. The actuator 1 includes a motor and a gear set, which are used to input torque and reduce rotation speed. The rotating part of the motion conversion structure 7 is a screw shaft 7a, and the translation part is a nut 7b. The nut 7b is fixedly connected to a base 8. A positioning structure is provided between the nut 7b and the base 8 to facilitate positioning and installation. The base 8 directly acts as a piston. At the same time, a sealing groove is processed on the base 8, and a sealing structure needs to be installed to prevent the motion conversion structure 7 from contacting the outside. The motion conversion structure 7 converts the torque and rotation speed of the rotating part into linear motion and thrust of the translation part, which directly pushes the brake pad to clamp the brake disc 11.

[0113] In the prior art, the radial dimensions of the cylinder hole 2-1 of the electronic mechanical brake caliper are relatively large. The reason is that in the existing EMB solution, the piston is arranged outside the ball screw shaft 7a and the nut 7b, and the piston occupies a certain radial space. In order to meet the arrangement of the ball screw shaft 7a and the piston, the cylinder hole 2-1 in the caliper body needs to be processed very large. One ball screw shaft 7a can only be adapted to one piston and is only suitable for a single brake pad. In addition, the ball screw structure has no positioning structure, making it difficult to achieve large-scale automated production.

[0114] The advantage of the present invention is that the radial dimension of the caliper cylinder hole 2-1 can be reduced through the split connection structure of the ball screw shaft 7a nut 7b and the base 8, and the ball screw shaft 7a nut 7b can be adapted to a variety of bases 8 and thus to brake pads of different types and sizes; at the same time, the base 8 has a positioning structure, which is convenient for positioning and installation and is suitable for mass production.

[0115] In the present invention, the nut 7b and the base 8 are set to be split-type connection, and one nut 7b can be adapted to a variety of bases 8, and the brake caliper does not need to be changed. The base 8 is arranged between the nut 7b and the brake pad. The matching surfaces of the nut 7b and the base 8 have a cylindrical surface and a positioning surface 8c. At the same time, the positioning surface 8c has a small inward inclination angle, and the cylindrical surface is an interference connection. Due to the inclination angle, the positioning surface 8c has a clearance fit at the head position and an interference connection at the bottom position. This will not affect the interference connection of the cylindrical surface, and is convenient for installation at the beginning. The positioning surfaces 8c are interference fit at the root, which can also play an anti-rotation role.

[0116] On this basis, welding or riveting is added to ensure the stability of the connection between the base 8 and the nut 7b, and the base 8 acts as a piston.

[0117] In addition, the end face of the screw has a screw positioning platform 7a6 that cooperates with the inner side of the base 8. Generally speaking, the nut 7b is installed on the outside of the screw shaft 7a. The nut 7b has an internal thread or an inner raceway, and the screw shaft 7a has an external thread or an outer raceway. The radial dimension of the nut 7b can be considered as the radial dimension of the motion conversion structure 7.

[0118] That is to say, the base 8 is connected to the nut 7b in a split manner, and the base 8 acts as a piston, and the piston does not occupy additional radial space.

[0119] On the other hand, there is at least one base positioning groove 8a on the base 8, which corresponds to the base zero position boss 8b and is used for positioning when installing the base 8; the anti-rotation boss or groove arranged on the outer wall of the nut 7b corresponds to the base positioning groove 8a, and is used for positioning when installing the motion conversion structure 7 to ensure that the boss or groove arranged on the outer wall of the nut 7b can be aligned with the boss or groove on the cylinder hole 2-1; the base positioning groove 8a corresponds to the shape of the base 8, and when the contact part of the base 8 has a phase requirement with the brake pad, the base 8 body can be positioned through the base positioning groove 8a.

[0120] At the same time, in the present invention, the setting of the base positioning groove 8a and the positioning structure plays a calibration role. When the position of the base 8 is determined by the base positioning groove 8a, combined with the positioning structure, the position limitation of the nut 7b and the screw shaft 7a during installation can be achieved.

[0121] In addition, in the present invention, the return device can be arranged on the screw shaft 7a or the nut 7b as needed. When the return structure 7a-1 can be arranged on the nut 7b, it is a conventional structure and will not be repeated here. When the return structure 7a-1 can be arranged on the screw shaft 7a, the return structure 7a-1 is arranged on the screw shaft 7a to form a ball closed-loop circulation. The transmission shaft 4 is arranged on the screw shaft 7a, and the transmission shaft 4 is connected to the screw shaft 7a through the preload mechanism 6. The transmission shaft 4 transmits the torque and speed to the screw shaft 7a. The motion conversion structure 7 converts the torque and speed of the rotating part into linear motion and thrust of the translation part, directly pushing the brake pad to clamp the brake disc 11.

[0122] In the prior art, the axial dimension of the screw shaft 7a in the electronic mechanical brake caliper is relatively large. The reason is that the return device of the ball screw shaft 7a of the existing EMB solution is arranged on the nut 7b. Since the nut 7b is a translation part, linear motion is required to realize caliper braking or release. In order to prevent the ball from falling off during the linear motion of the nut 7b, the axial dimension of the screw shaft 7a must be at least larger than the sum of the axial dimension of the closed-circuit ball circulation and the axial dimension of the linear stroke of the nut 7b, which will make the axial dimension of the screw shaft 7a large.

[0123] The advantage of the present invention is that by arranging the return structure 7a-1 on the screw shaft 7a, directly adding the return structure 7a-1 on the external thread machine of the screw shaft 7a or directly arranging the return device on the screw shaft 7a, the axial dimension of the screw shaft 7a only needs to be larger than the axial dimension of the closed-circuit ball circulation. Since the nut 7b is a translation part and the screw shaft 7a is a rotating part, the ball will not fall off no matter how the nut 7b moves.

[0124] In the present invention, the return device is directly arranged on the screw shaft 7a, or the return structure 7a-1 is directly machined, and the transmission shaft 4 is arranged on the screw shaft 7a. The two are connected by a preload mechanism 6. Splines, balls and other parts that do not generate heat or generate very little heat are arranged in the transmission shaft 4. The transmission shaft 4 is coupled with the screw shaft 7a. The transmission shaft 4 transmits the torque and rotation speed to the screw shaft 7a. The transmission heating parts are arranged outside the transmission shaft 4. Since the axial dimension of the screw shaft 7a is small, the arrangement of this part of the parts will have an additional radial dimension of the wall thickness of the screw shaft 7a, which is convenient for the arrangement of this part of the parts.

[0125] In the present invention, the motion conversion structure 7 at least includes a rotating part and a translational part; the actuator 1 includes a motor and a deceleration and torque-increasing mechanism; the translational part includes a nut 7b and a base 8, the nut 7b is fixedly connected to the base 8, and the connection method between the nut 7b and the base 8 can be selected as needed. At the same time, in the present invention, a positioning structure is provided between the base 8 and the screw shaft 7a, and the positioning structure includes a base zero-position boss 8b arranged on the base 8 and a screw positioning platform 7a6 arranged at the end of the screw shaft 7a, and the outer side surface of the base zero-position boss 8b close to the screw positioning platform 7a6 is an arc surface; at the same time, in the present invention, the positioning structure and the base positioning groove 8a have an angular relationship with some features on the screw shaft 7a and / or the nut 7b; the position calibration of the screw shaft 7a and the nut 7b during installation is realized by calibrating the angle.

[0126] Meanwhile, in the present invention, the base 8 at least includes a circular portion, and the circular portion of the base 8 independently cooperates with the dust cover 9 to achieve dustproofing and sealing.

[0127] The base 8 may also include a contact portion, which is the above-mentioned base 81 structure. In the present invention, the base 81 in the base 8 fits with the inner brake pad 10, and the outer contour of the base 81 can be circular, oval, square or consistent with the shape of the inner brake pad 10.

[0128] A plurality of base positioning grooves 8a are provided on the base 81 of the base 8, and the base positioning grooves 8a correspond to the shape of the base 8. When the base 81 of the base 8 has a phase requirement, the base 8 can be positioned by the base positioning grooves 8a; at the same time, in the present invention, the base 8 and the nut 7b are interference connected, and a side fixing groove is provided on the base 8, which has an anti-rotation function.

[0129] In subsequent use, the setting of the base positioning groove 8a plays a good role in position limitation. The base positioning groove 8a and the side fixing groove are calibrated with each other and are used for positioning when installing the base 8 to ensure that the side ring seat 82 is aligned and installed on the nut 7b.

[0130] The present invention can reduce the radial size of the caliper body cylinder hole 2-1 through the split design of the nut 7b and the base 8, which is beneficial to reducing the overall size of the caliper; the base 8 has a variety of shapes and sizes and can adapt to friction plates of different types and sizes.

[0131] In the present invention, the base positioning groove 8a and the positioning structure cooperate with each other, so that the connection between the base 8 and the nut 7b and the installation of the screw shaft 7a on the caliper body 2 have the same positioning structure, which is easy to achieve mass production.

[0132] In the present invention, one nut 7b can be adapted to a variety of bases 8 and thus to friction plates of different types and sizes. Meanwhile, the base 8 has a positioning structure, which is easy for mass production.

[0133] In the present invention, the setting position of the return structure 7a-1 is different. When the return structure 7a-1 is arranged on the screw shaft 7a, the return structure 7a-1 is provided on the external threaded raceway 7a01 of the screw shaft 7a where the steel balls circulate; the steel balls circulate on the raceway of the screw shaft 7a through the return structure 7a-1, the length of the screw shaft 7a is less than the length of the nut 7b, the first bearing 5 and the screw are coaxially arranged, and the first bearing 5 is arranged above the screw shaft 7a; the transmission shaft 4 is connected to the screw shaft 7a through a spline, the transmission shaft 4 is arranged on the screw shaft 7a, and a pre-tightening mechanism 6 is provided between the transmission shaft 4 and the screw shaft 7a, and the pre-tightening mechanism 6 fixes the transmission shaft 4 and the screw shaft 7a together.

[0134] The return device is arranged on the screw shaft 7a, and the axial dimension of the screw shaft 7a can be smaller than the axial dimension of the nut 7b. The plane needle bearing is arranged on one side of the screw shaft 7a, and the radial space of the plane needle bearing is increased, and the axial dimension can be reduced, thereby reducing the axial dimension of the caliper assembly and making full use of the space inside the ball screw shaft 7a.

[0135] It is also possible to reduce the radial dimensions of the ball screw shaft 7a and the cylinder bore 2-1 while keeping the dimensions of the thrust needle roller bearing unchanged, which is more conducive to layout on the vehicle.

[0136] The pretensioning mechanism 6 has various embodiments.

[0137] Solution 1: The pre-tightening mechanism 6 may include an elastic retaining ring 6a, and have the function of the retaining ring 6a, and can also generate an axial pre-tightening force.

[0138] Solution 2: The preload mechanism 6 further includes a disc spring 6c and a retaining ring 6a, wherein the retaining ring 6a is installed in an annular groove 7a1 in the screw shaft 7a, and the disc spring 6c is installed between the retaining ring 6a and the transmission shaft 4.

[0139] Solution 3: The pre-tightening mechanism 6 also includes a retaining ring 6a, a flat washer and a wave spring 6e.

[0140] Solution 4: retaining ring 6a and top wave spring 6f.

[0141] When installing schemes three and four: the retaining ring 6a is installed in the annular groove 7a1 of the screw shaft 7a, and a flat washer and a wave spring 6e are arranged below in sequence, or a top wave spring 6f is arranged directly under the retaining ring 6a.

[0142] In addition, a caliper bushing 3 is provided at the connection between the transmission shaft 4 and the brake caliper, and the caliper bushing 3 plays a good installation protection role.

[0143] Embodiment 1:

[0144] like Figures 1 to 6 As shown, the brake caliper of this embodiment includes an actuator 1, a brake caliper, a brake pad, a brake disc 11, a dust cover 9, and a motion conversion structure 7: a transmission shaft 4, a first bearing 5, an elastic retaining ring 6a, a screw shaft 7a, a nut 7b, and a base 8.

[0145] The actuator 1 at least includes a motor and a deceleration and torque-increasing mechanism. The motor inputs torque. The deceleration and torque-increasing mechanism is used to reduce the rotation speed and increase the torque. The torque is input to the rotating member screw shaft 7a to drive the screw shaft 7a to rotate.

[0146] In this embodiment, the base 8 has three base positioning grooves 8a, and the positioning surface 8c has a small outward inclination angle, which is convenient for the base 8 to be installed on the nut 7b. At the same time, the base zero-position boss 8b can be used to terminate the relative movement between the nut 7b and the screw.

[0147] The brake caliper assembly is a floating caliper structure, and the brake caliper includes a caliper body 2; a cylinder hole 2-1 is provided in the caliper body 2, that is, the brake caliper assembly disclosed in the present invention has a cylinder hole 2-1 and a hook structure, and a brake pad and a brake disc 11 are installed in the hook structure in sequence.

[0148] The structures of the brake caliper, the motor and the gear set in the actuator 1 are well known to those skilled in the art and will not be described in detail here.

[0149] like Figure 1 As shown, the motion conversion structure 7 includes a screw shaft 7a, a nut 7b and a base 8.

[0150] The screw shaft 7a is connected to the transmission shaft 4. In this embodiment, the rotating part is the screw shaft 7a, the translating part is the nut 7b7, the inner wall of the translating part is provided with an inner spiral raceway matching the outer spiral raceway of the rotating part, the outer wall of the translating part is provided with an anti-rotation boss or groove matching the brake caliper cylinder hole 2-1, the end face of the translation mechanism is in contact with the inner brake pad 10, the transmission shaft 4 is mounted on the screw shaft 7a, pre-tightened by the pre-tightening mechanism 6, and then the needle bearing is arranged above the elastic retaining ring 6a.

[0151] like Figures 2 to 5As shown, the base 8 is provided with a base positioning groove 8a, a base zero-position boss 8b, and a positioning surface 8c.

[0152] The base 8 can independently cooperate with the dust cover 9 to achieve sealing and dustproofing.

[0153] The nut 7b is provided with a sleeve ring groove 7b1, and the base 8 is sleeved on the nut 7b through the side ring seat 82, and the side fixed edge groove plays a good calibration role, which facilitates the mutual positioning of the base 8 and the nut 7b during installation.

[0154] The base zero position boss 8b and the screw positioning platform 7a6 on the screw shaft 7a are calibrated with each other.

[0155] The positioning surface 8c on the base 8 can prevent the base 8 from rotating relative to the nut 7b. At the same time, there is a small outward inclination on the positioning surface 8c. The fit between the base 8 and the nut 7b changes from a clearance fit to an interference fit. On the one hand, the interference fit increases the reliability of the connection; on the other hand, the clearance fit in the initial stage can facilitate the positioning of the base 8.

[0156] This implementation case facilitates the installation of the nut 7b and the base 8, and the installation of the nut 7b and the brake caliper cylinder hole 2-1, because it has a unique positioning structure: the base positioning groove 8a on the base 8 corresponds to the zero-position boss, the base positioning groove 8a on the base 8 corresponds to the positioning surface 8c, the base positioning groove 8a and the nut 7b correspond to the anti-rotation boss matching the brake caliper cylinder hole 2-1, and a series of structural positioning correspondences facilitate positioning and installation, and are easy to achieve mass production.

[0157] Implementation case 2:

[0158] like Figure 7 As shown, the second embodiment is basically the same as the first embodiment, and the only difference is that the base 8 of this embodiment is larger in size and can adapt to brake pads of larger sizes. The shape of the base 8 can be a regular square or circle, or an irregular arc or consistent with the shape of the brake pad. Thanks to the split structure of the nut 7b and the base 8, one nut 7b can be adapted to multiple bases 8 and thus different brake pads.

[0159] Implementation case three:

[0160] like Figure 8 As shown, the brake caliper at least includes an actuator 1, a brake caliper, and a motion conversion structure 7, wherein: the actuator 1 at least includes a motor and a gear set. The actuator 1 is an existing mature technology and will not be described in detail here.

[0161] The motion conversion structure 7 is a ball screw shaft 7a, which includes at least a rotating part and a translational part. The rotating part is the screw shaft 7a, and the translational part is the nut 7b. The nut 7b is open at both ends and is annular. The cross-section of the screw shaft 7a is H-shaped. The axial length of the screw shaft 7a is much smaller than the axial length of the nut 7b, which can reduce materials and reduce the arrangement space of the screw shaft 7a in the nut 7b, making it convenient to arrange other parts. The nut 7b has an internal thread, the screw shaft 7a has an external thread, and there is a ball between the screw shaft 7a and the nut 7b.

[0162] like Fig. 9 As shown, a return device is installed on the screw shaft 7a or a return track structure is directly processed, and the balls form a closed-loop circulation raceway through the return structure 7a-1.

[0163] The outer wall of the nut 7b is provided with a boss, and a matching groove is provided in the brake caliper cylinder hole 2-1 to prevent the nut 7b from rotating and ensure its linear motion.

[0164] In addition, in the present invention, the nut 7b and the base 8 can adopt an integrated structure or a split structure, and the specific selection can be made according to needs.

[0165] An annular groove 83 is provided on the outer wall of the base 8 ; the provision of the annular groove 83 facilitates the connection and installation between the dust cover 9 and the base 8 .

[0166] The brake caliper assembly is a floating caliper structure, which has a cylinder hole 2-1 and a hook structure, in which an inner brake pad 10, a brake disc 11, and an outer brake pad 12 are sequentially installed.

[0167] like Figure 8 As shown, the ball screw shaft 7a is arranged in the cylinder hole 2 - 1 of the brake caliper, and the transmission shaft 4 is installed on the screw shaft 7a. The transmission shaft 4 is connected to the screw shaft 7a through a preload mechanism 6.

[0168] In addition, in the present invention, the transmission shaft 4 includes a transmission shaft body 41, on which a transmission end block 42 is provided; the transmission end block 42 is inserted into the upper avoidance groove 7a2; a spherical protrusion is provided at one end of the transmission end block 42 away from the transmission shaft body 41; during subsequent use, the transmission shaft 4 cooperates with the arc groove 7a5 in the adjustment groove through the spherical protrusion to form a spherical pair, which has a self-aligning function and eliminates the braking tangential force.

[0169] At the same time, the above-mentioned preload mechanism 6 of the present invention uses a single-part elastic retaining ring 6a, which is arranged in the annular groove 7a1 of the screw shaft 7a, and a needle bearing is arranged on the transmission shaft 4. The needle bearing converts the sliding friction of the transmission shaft 4 into rolling friction, thereby reducing the friction loss and ensuring the smooth rotation of the transmission shaft 4.

[0170] Implementation Case 4:

[0171] like Fig.10 As shown, the structure of the brake caliper provided in this embodiment is different from that of the brake caliper provided in the third embodiment in that the pre-tightening mechanism 6 of the transmission shaft 4 in this embodiment is different.

[0172] In this implementation case, two parts are used: a retaining ring 6a and a disc spring 6c. The retaining ring 6a is installed in the annular groove 7a1 of the screw shaft 7a, and the disc spring 6c is arranged under the retaining ring 6a. The preload mechanism 6 has great stability. Since the transmission shaft 4 has a certain amount of activity, the disc spring 6c will not fall out from under the retaining ring 6a during the shaking of the transmission shaft 4. At the same time, the connection of the disc spring 6c has a certain reliability.

[0173] Implementation Case 5:

[0174] like Figure 11-12 As shown, the structure of the brake caliper provided in this embodiment is different from that of the brake calipers provided in the third and fourth embodiments in that the pre-tightening mechanism 6 of the transmission shaft 4 in this embodiment is different.

[0175] Fig.11 In the invention, three parts are used: a wave spring 6e, a gasket, and a retaining ring 6a. The retaining ring 6a is installed in the annular groove 7a1 of the screw shaft 7a, and the gasket and the wave spring 6e are arranged thereunder in sequence. The retaining ring 6a provides positioning. The gasket prevents the wave spring 6e from escaping from the retaining ring 6a and causing the preload mechanism 6 to fail. The wave spring 6e is used to provide a preload force. At present, the manufacturing process of the wave spring 6e is relatively perfect, and the size of the preload force is controllable.

[0176] Fig.12 In the embodiment, the gasket and wave spring 6e are replaced with the top wave spring 6f, which can integrate the functions of the two and reduce the number of parts.

[0177] Implementation Case 6:

[0178] like Fig.13 As shown, the structure of the brake caliper provided in this embodiment is different from that of the brake caliper provided in the third embodiment.

[0179] The transmission shaft 4 is changed into two parts, namely, a torque transmission shaft 4a and a flange sleeve 4b. An adjusting member 44 is provided between the transmission shaft 4 and the screw shaft 7a. The adjusting member 44 is composed of spherical surfaces at both ends and a middle section 441 located between the spherical surfaces at both ends. The spherical surfaces 442 at both ends of the adjusting member 44 are in contact with the adjacent dual parts respectively to form a double spherical pair mechanism.

[0180] The adjusting member 44 has a self-aligning function to eliminate the influence of the braking tangential force on the transmission shaft 4. The preload mechanism 6 between the transmission shaft 4 and the screw shaft 7a is a disc spring 6c. The disc spring 6c is arranged in the annular groove 7a1 of the screw shaft 7a to preload the transmission shaft 4. The flange sleeve is arranged on the transmission shaft 4, and a needle bearing is arranged thereon.

[0181] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A motion conversion structure, characterized in that: It comprises a screw shaft (7a), a ball bearing, and a translation mechanism; the ball bearing is arranged in a region between the screw shaft (7a) and the translation mechanism; The motion conversion structure also includes a return structure (7a-1); the return structure (7a-1) is arranged on the screw shaft (7a).

2. A motion conversion structure according to claim 1, characterized in that: The screw shaft is provided with an external threaded raceway (7a01) for ball circulation; the screw shaft (7a) is provided with a return structure (7a-1); the return structure (7a-1) can at least connect adjacent external threaded raceways (7a01) to form a closed-loop circulation raceway; the return structure (7a-1) and the screw shaft (7a) are designed to be integral or separate.

3. A motion conversion structure according to claim 2, characterized in that: The return structure (7a-1) comprises an upward threaded raceway (7a-11) arranged on the screw shaft (7a), and the upward threaded raceway (7a-11) is used to connect two adjacent threaded raceways.

4. A motion conversion structure according to claim 2, characterized in that: The return structure (7a-1) comprises a mounting groove arranged on the screw shaft (7a), a return device is arranged in the mounting groove, and an upward threaded raceway (7a-11) is arranged in the return device; the upward threaded raceway (7a-11) on the return device is used to connect two adjacent threaded raceways.

5. A motion conversion structure according to any one of claims 1 or 2, characterized in that: The screw shaft (7a) comprises a shaft body, on which an avoidance groove is provided; the avoidance groove comprises a lower avoidance groove (7a3) and an upper avoidance groove (7a2) arranged on the shaft body, and the lower avoidance groove (7a3) and the upper avoidance groove (7a2) are distributed at both ends of the shaft body.

6. A motion conversion structure according to any one of claims 1 or 2, characterized in that: The translation mechanism comprises a nut (7b) and a base (8); the nut (7b) is connected to the brake pad via the base (8); A positioning structure is provided between the screw shaft (7a) and the base (8); the positioning structure comprises a base zero-position boss (8b) provided on the base (8) and a screw positioning platform (7a6) provided at the end of the screw shaft (7a); the outer side surface of the base zero-position boss (8b) close to the screw positioning platform (7a6) is an arc-shaped surface.

7. A motion conversion structure according to any one of claims 1 or 2, characterized in that: The nut (7b) and the base (8) in the translation mechanism are of split design.

8. A brake caliper assembly, comprising a brake caliper, a brake pad and an actuator, characterized in that: The brake caliper comprises a caliper body (2); the caliper body (2) is provided with at least one set of motion conversion structures as described in claims 1 to 4; The motion conversion structure can convert rotational motion into linear motion so that the brake pad performs linear motion; the actuator controls the screw shaft (7a) to rotate; and the screw shaft (7a) can drive the translation mechanism to perform linear motion through the ball bearings.

9. The brake caliper assembly according to claim 5, characterized in that: A cylinder hole (2-1) is provided in the caliper body (2); the motion conversion structure is inserted into the cylinder hole (2-1); the actuator controls the operation of the motion conversion structure through a transmission shaft (4); the transmission shaft (4) comprises a transmission shaft (4) body, and a transmission end block (42) is provided on the transmission shaft (4); the transmission end block (42) is inserted into the upper avoidance groove (7a2).

10. The brake caliper assembly according to claim 6, characterized in that: An adjustment groove (7-1) is provided in the upper avoidance groove (7a2) of the screw shaft (7a), and the adjustment groove (7-1) comprises a calibration groove (7a4) and an arc groove (7a5), wherein the calibration groove (7a4) extends from the upper avoidance groove (7a2) to one side of the lower avoidance groove (7a3); and the arc groove extends from the calibration groove (7a4) to one side of the lower avoidance groove (7a3).

11. A brake caliper assembly according to claim 7, characterized in that: The transmission end block (42) comprises an end block body, on which an adjusting member (44) is provided; one end of the adjusting member (44) is plugged into the end block body, and the other end is plugged into the position adjustment sink (7-1); the adjusting member (44) is movably connected to the end block body and the lead screw shaft (7a); The adjusting member (44) comprises a middle section and spherical surfaces arranged at both ends of the middle section; the end block body is also provided with a position adjusting groove (7-1); one end of the adjusting member (44) is arranged in the position adjusting groove (7-1) on the end block body, and the other end is arranged in the position adjusting groove (7-1) of the screw shaft (7a).

12. The brake caliper assembly according to claim 6, characterized in that: A pre-tightening mechanism (6) is provided between the transmission shaft (4) and the screw shaft (7a); the pre-tightening mechanism (6) comprises a retaining ring (6a); an annular embedding groove (7a1) is provided on the inner wall of the upper avoidance groove (7a2) on the screw shaft (7a); the retaining ring (6a) is embedded in the annular embedding groove (7a1) and overlapped on the transmission shaft (4).

13. The brake caliper assembly according to claim 9, characterized in that: The transmission end block (42) is provided with an annular recessed groove (43); the retaining ring (6a) is overlapped on the transmission end block (42).

14. The brake caliper assembly according to claim 10, characterized in that: The preload mechanism (6) further comprises an elastic component; the elastic component comprises one or more of a disc spring (6c), a wave spring (6e) and a top-to-top wave spring (6f); the retaining ring (6a) is overlapped on the transmission shaft (4) via the elastic component.

15. The brake caliper assembly according to claim 11, characterized in that: The pre-tightening mechanism (6) further comprises a gasket (6d); the retaining ring (6a) is connected to the elastic component via the gasket (6d).

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