Brake caliper assembly, brake system with brake caliper assembly and vehicle

Abstract

The invention relates to the field of brake calipers, in particular to a brake caliper assembly, a brake system with the brake caliper assembly and a vehicle, the brake caliper assembly comprises a brake caliper, a brake pad and an actuator, and the brake caliper comprises a caliper body; the caliper body is internally provided with at least one planetary roller lead screw mechanism capable of converting rotary motion into linear motion so as to enable the brake pad to do linear motion. The planetary roller lead screw mechanism comprises a lead screw shaft, a nut and a roller; the pin roller is connected to the lead screw shaft in a sleeved mode, and the nut is connected to the pin roller in a sleeved mode. The actuator controls the nut to rotate; the nut can drive the lead screw shaft to do linear motion through the pin roller. A traditional ball screw mechanism is replaced by the planetary roller screw mechanism, the axial rigidity of a motion conversion mechanism in a traditional brake caliper assembly can be increased, the axial load bearing capacity of the traditional brake caliper assembly can be increased, in addition, traditional balls are replaced by the rollers, contact between the balls of the ball screw and a roller path can be prevented from being point contact, and the service life of the brake caliper assembly is prolonged. And a ball raceway is easy to wear, and the wear loss is large.

Description

Technical Field

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

[0002] At present, the EMB electronic brake caliper is directly arranged at the wheel end, replacing the original hydraulic brake system, using wire lines instead of hydraulic pipelines, and realizing 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 motion conversion mechanism is an important part of the EMB system, which converts rotational motion into linear motion, thereby pushing the piston for braking.

[0004] In the prior art, the motion conversion mechanism is a common linear transmission element ball screw, which consists of a screw with balls and a nut. Although it has the characteristics of simple structure and mature processing technology, its transmission accuracy is not high. If it needs to withstand high torque and high load, it requires a larger volume and cannot meet some high-speed and heavy-load applications. In addition, the balls on the ball screw guide rail are easy to wear and difficult to maintain, which is not conducive to the stability and economy of long-term use.

[0005] For example, the content disclosed in Patent 202211223473.9 - An actuator and an electromechanical brake caliper.

[0006] Therefore, in order to improve or solve at least one of the above problems, it is necessary to optimize the design of the existing brake caliper assembly. Summary of the invention

[0007] The purpose of the present invention is to provide a brake caliper assembly which has high transmission efficiency and precision and is suitable for high speed and heavy load.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is:

[0009] A brake caliper assembly comprises a brake caliper, a brake pad and an actuator, wherein the brake caliper comprises a caliper body; the caliper body is provided with at least one set of planetary roller screw mechanisms capable of converting rotational motion into linear motion to enable the brake pad to perform linear motion;

[0010] The planetary roller screw mechanism comprises a screw shaft, a nut and a roller;

[0011] The roller is sleeved on the screw shaft, and the nut is sleeved on the roller;

[0012] The actuator controls the rotation of the nut; the nut can drive the screw shaft to perform linear motion through the roller.

[0013] A cylinder hole is provided in the caliper body; the planetary roller screw mechanism is inserted in the cylinder hole; the screw shaft in the planetary roller screw mechanism is arranged in the cylinder hole and extends toward the brake pad and / or the actuator.

[0014] The planetary roller screw mechanism further includes an anti-rotation component, which includes an anti-rotation element connected to the screw shaft; the anti-rotation element can limit the rotation of the screw shaft; the anti-rotation element is connected to the actuator or the caliper body and is connected to the screw shaft;

[0015] The screw shaft comprises a shaft body, an anti-rotation groove is provided on the shaft body, and the anti-rotation element is inserted into the anti-rotation groove.

[0016] The actuator is connected to the nut via a torque transmission element; the torque transmission element can drive the nut to rotate.

[0017] The nut comprises a nut body; a connecting ring groove is provided on the nut body, and the connecting ring groove is arranged at one end of the nut body close to the brake pad; and the torque input element in the torque transmission element is arranged in the connecting ring groove.

[0018] A base is provided at one end of the screw shaft close to the brake pad; the screw shaft and the base are connected in a fixed or detachable connection manner; and the relative positions of the screw shaft and the base are fixed during operation.

[0019] The caliper body is provided with a lower opening; the lower opening is communicated with the cylinder hole; the planetary roller screw mechanism is connected with the brake pad through the lower opening; the caliper body is also provided with a lateral opening, and the torque transfer element is connected with the nut through the lateral opening.

[0020] A positioning ring plate is arranged in the lower opening, and the positioning ring plate is sleeved on the planetary roller screw mechanism.

[0021] The brake caliper assembly also includes a bearing mechanism arranged in the cylinder hole; the bearing mechanism includes a thrust bearing arranged on the nut.

[0022] The thrust bearing comprises a first thrust bearing and a second thrust bearing; the first thrust bearing and the second thrust bearing are distributed at both ends of the nut, the first thrust bearing is arranged at the end of the nut away from the brake pad, and the second thrust bearing is arranged in the area between the torque input element and the positioning ring plate;

[0023] The bearing mechanism also includes a radial bearing; the side surface of the nut fits with the inside of the cylinder hole through the radial bearing.

[0024] The brake caliper assembly further comprises an identification unit arranged in the cylinder hole; the identification unit comprises a pressure identification unit arranged in the cylinder hole; the pressure identification unit is arranged between the planetary roller screw mechanism and the inner wall of the cylinder hole.

[0025] The planetary roller screw mechanism is one of a differential planetary roller screw mechanism, a standard planetary roller screw mechanism, a reverse planetary roller screw mechanism or a circulating planetary roller screw mechanism.

[0026] A braking system comprises the brake caliper assembly.

[0027] A vehicle comprises the braking system.

[0028] The advantages of the present invention are:

[0029] The invention discloses a brake caliper assembly and a brake system and a vehicle having the brake caliper assembly.

[0030] The present invention replaces the traditional ball screw mechanism with a planetary roller screw mechanism, which can increase the axial stiffness of the motion conversion mechanism in the traditional brake caliper assembly and increase the axial load bearing capacity of the traditional brake caliper assembly. In addition, the rollers replace the traditional balls, which can avoid the point contact between the ball screw ball and the raceway, the ball raceway is easy to wear, the wear amount is large, and the service life is relatively short.

[0031] In other words, the present invention replaces balls with rollers to increase the transmission efficiency and accuracy of the motion conversion mechanism. At the same time, it is wear-resistant and has a long service life, and is suitable for high-speed and heavy-load linear applications.

[0032] In addition, the present invention uses the nut as a rotating part and the screw shaft as a translating part. Since the screw shaft can pass through the caliper body and enter the actuator when arranged, the space inside the controller can be fully utilized, thereby utilizing the axial space in parallel and shortening the axial size of the caliper assembly.

[0033] In addition, the present invention can increase the effective stroke of the piston due to the relative growth of the screw shaft, thereby being able to adapt to thicker friction plates; thereby improving the scope of application of the present invention, increasing the service life of the friction plates in the brake caliper assembly, and reducing the cost of replacing parts for users.

[0034] In addition, in the present invention, because the translation member is a screw shaft, the diameter of the screw shaft is small, the diameter of the thrust bearing and the diameter of the cylinder hole can be reduced, thereby reducing the radial size of the caliper assembly, which is more conducive to layout on the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The following is a brief description of the contents expressed in the drawings of the present specification and the marks in the drawings:

[0036] Figure 1 It is a structural diagram of embodiment 1 of the present invention.

[0037] Figure 2 It is a structural diagram of embodiment 2 of the present invention.

[0038] Figure 3 It is a structural schematic diagram of a pressure identification unit provided in the first embodiment of the present invention.

[0039] Figure 4 This is a schematic diagram of the structure when a pressure identification unit is provided in the second embodiment of the present invention.

[0040] The marks in the above figure are:

[0041] 1. Controller; 1-1. Controller housing; 2. Input element; 3. Torque transmission element; 4. Caliper body; 4-1. Cylinder bore; 5. Anti-rotation element; 6. First thrust bearing; 7. Radial bearing; 8. Planetary roller screw mechanism; 8a. Screw shaft; 8a1. Anti-rotation groove; 8b. Roller; 8c. Nut; 9. Torque input element; 10. Lower opening; 11. Second thrust bearing; 12. Positioning ring plate; 13. Sealing cover; 14. Inner brake pad; 15. Brake disc; 16. Outer brake pad; 17. Pressure identification unit; 18. Side opening. DETAILED DESCRIPTION

[0042] 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.

[0043] A brake caliper assembly comprises a brake caliper, a brake pad and an actuator, wherein the brake caliper comprises a caliper body 4; the caliper body 4 is provided with at least one planetary roller screw mechanism 8 capable of converting rotational motion into linear motion to enable the brake pad to perform linear motion; the planetary roller screw mechanism 8 comprises a screw shaft 8a, a nut 8c and a roller 8b; the roller 8b is sleeved on the screw shaft 8a, and the nut 8c is sleeved on the roller 8b; the actuator controls the rotation of the nut 8c; the nut 8c can drive the screw shaft 8a to perform linear motion through the roller 8b; the present invention replaces the traditional ball screw mechanism with the planetary roller screw mechanism 8, thereby increasing the axial stiffness of the motion conversion mechanism in the traditional brake caliper assembly and increasing the axial load bearing capacity of the traditional brake caliper assembly; in addition, the roller 8b replaces the traditional ball, thereby avoiding the problem that the ball of the ball screw and the raceway are in point contact, the ball raceway is easily worn, the wear amount is large, and the service life is relatively short.

[0044] In other words, the present invention replaces the ball with the roller 8b, thereby increasing the transmission efficiency and accuracy of the motion conversion mechanism. At the same time, it is wear-resistant and has a long service life, and is suitable for high-speed and heavy-load linear applications.

[0045] The brake caliper assembly disclosed in the present invention is mainly a floating caliper assembly.

[0046] The present invention replaces the traditional ball screw mechanism with the planetary roller screw mechanism 8, thereby increasing the longitudinal load capacity of the brake caliper assembly and extending the service life of the brake caliper.

[0047] Specifically, the brake caliper assembly disclosed in the present invention mainly includes a brake caliper, a brake pad and an actuator. The brake caliper is the main structure of the brake caliper assembly, and the actuator includes an input element 2, a controller 1 and a torque transmission element 3; the torque transmission element 3 includes a torque input element 9, and the torque input element 9 can be a gear structure, such as an input gear, and of course it can also be other input parts. Essentially, it can drive the rotation of the nut 8c and can be used in the present invention.

[0048] At the same time, in the present invention, the brake pad is a friction pad, which is generally divided into an inner brake pad 14 and an outer brake pad 16 based on the different layout positions, and is respectively arranged on the opposite sides of the brake disc 15. Subsequently, the inner brake pad 14 and the outer brake pad 16 clamp and rub the brake disc 15 to achieve the braking operation of the brake disc 15.

[0049] In addition, in the present invention, the planetary roller screw mechanism 8 is the motion and rotation mechanism in the traditional brake caliper assembly.

[0050] In the present invention, the planetary roller screw mechanism 8 includes a screw shaft 8a, a nut 8c and a roller 8b; the roller 8b is sleeved on the screw shaft 8a, and the nut 8c is sleeved on the roller 8b; the actuator controls the rotation of the nut 8c; the nut 8c can drive the screw shaft 8a to make a linear motion through the roller 8b; the torque input element 9 is connected to the nut 8c, and the nut 8c rotates under the drive of the torque input element 9; at this time, the nut 8c is a rotating part; and the screw shaft 8a is a translational part.

[0051] At the same time, the brake caliper described in the present invention includes a caliper body 4; the caliper body 4 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 planetary roller screw mechanisms 8 capable of converting rotational motion into linear motion so that the brake pad can perform linear motion is arranged in the caliper body 4; 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 planetary ball screw mechanisms.

[0052] In addition, in order to ensure the linearity of the movement of the screw shaft 8a, the present invention requires that the planetary roller screw mechanism 8 also includes an anti-rotation component, which essentially limits the rotation of the screw shaft 8a, but does not limit the movement of the screw shaft 8a along its axial direction.

[0053] In the present invention, the anti-rotation component includes an anti-rotation element 5 connected to the screw shaft 8a; the anti-rotation element 5 can limit the rotation of the screw shaft 8a; the screw shaft 8a includes a shaft body, the shaft body is provided with an anti-rotation groove 8a1, and the anti-rotation element 5 is inserted in the anti-rotation groove 8a1; in the present invention, the anti-rotation element 5 is inserted in the anti-rotation groove 8a1, and the rotation limitation of the screw shaft 8a can be achieved by limiting the structure of the anti-rotation element 5 and the anti-rotation groove 8a1. For example, the anti-rotation element 5 and the anti-rotation groove 8a1 can be connected by a spline mechanism, and the anti-rotation element 5 and the anti-rotation groove 8a1 can also be designed as a polygonal structure.

[0054] At the same time, in the present invention, the anti-rotation element 5 is connected to the actuator or caliper body 4 and connected to the screw shaft 8a; specifically, the anti-rotation element 5 is mainly fixedly connected to the corresponding component; this facilitates the restriction of the rotation of the screw shaft 8a during subsequent use.

[0055] Based on the different connection arrangements of the anti-rotation element 5 , different technical solutions are formed.

[0056] In the present invention, the anti-rotation element 5 can be directly connected to the caliper body 4 .

[0057] Based on such a connection method, the anti-rotation element 5 can be directly connected to the caliper body 4, which facilitates the pre-installation positioning of the operation conversion mechanism to a certain extent and can better ensure the accuracy of the assembly position of the operation conversion mechanism.

[0058] In the present invention, the anti-rotation element 5 can be connected to the actuator, generally connected to the controller 1 in the actuator, and specifically can be connected to the housing of the actuator. The anti-rotation element 5 is connected to the actuator, and the two are fixedly connected. At this time, the screw shaft 8a can extend through the caliper body 4 to the inside of the controller 1. Such a setting can not only ensure the length of the screw shaft 8a, but also make full use of the space inside the controller 1 in subsequent production, thereby utilizing the axial space in parallel, and shortening the axial dimension of the caliper assembly.

[0059] Furthermore, in the present invention, a cylinder hole 4 - 1 is provided in the caliper body 4 ; the cylinder hole 4 - 1 is an internal cavity structure in the caliper body 4 , which facilitates the arrangement and placement of the planetary roller screw mechanism 8 and bearings and other mechanisms.

[0060] In the present invention, the planetary roller screw mechanism 8 is inserted into the cylinder bore 4-1; the screw shaft 8a in the planetary roller screw mechanism 8 is arranged in the cylinder bore 4-1 and extends toward the brake pad and / or the actuator; based on such a configuration, the arrangement and size of the screw shaft 8a of the present invention can be selected as needed; during subsequent arrangement, the screw shaft can pass through the caliper body 4 and enter the actuator, so that the space inside the controller 1 can be fully utilized, thereby utilizing the axial space in parallel and shortening the axial dimension of the caliper assembly.

[0061] In addition, in subsequent use, it is also convenient to change the size of the screw shaft 8a. For example, by reducing the diameter of the screw shaft 8a, the diameter of the thrust bearing and the diameter of the cylinder hole 4-1 can be reduced, thereby reducing the radial size of the caliper assembly, which is more conducive to layout on the vehicle.

[0062] Furthermore, in the present invention, the actuator is connected to the nut 8c through the torque transfer element 3; the torque transfer element 3 can drive the nut 8c to rotate; the torque transfer element 3 also includes a torque input element 9, and the torque input element 9 can be a gear structure, such as an input gear, and of course it can also be other input parts. Essentially, it can drive the rotation of the nut 8c and can be used in the present invention; the present invention facilitates the connection between the actuator and the nut 8c through the setting of the torque transfer element 3.

[0063] At the same time, in the present invention, the nut 8c includes a nut 8c body; a connecting ring groove is provided on the nut 8c body, and the connecting ring groove is arranged at one end of the nut 8c body close to the brake pad; the torque input element 9 in the torque transmission element 3 is arranged in the connecting ring groove; in the present invention, the nut 8c body is the main structure of the nut 8c, and the setting of the connecting ring groove is equivalent to forming an annular step platform on the outside of the nut 8c body. The present invention can not only reduce the overall mass of the nut 8c through the setting of the connecting ring groove, but also facilitate the axial limiting ability between the torque input element 9 and the nut 8c through the setting of the step platform, thereby avoiding the torque input element 9 on the nut 8c along the axial movement of the nut 8c; at the same time, it can also facilitate the arrangement and placement of the torque input element 9 and reduce the lateral space occupied by the torque input element 9.

[0064] At the same time, in the present invention, the torque input element 9 can be an input gear structure with internal teeth, and driving teeth are provided on the outer surface of the nut 8c. The driving teeth on the nut 8c and the internal teeth on the input gear are meshed with each other, thereby realizing the connection between the nut 8c and the torque input element 9.

[0065] Of course, a simpler connection method is to fixedly connect the torque input element 9 and the nut 8c. The fixed connection method is selected according to needs.

[0066] Furthermore, in the present invention, a base 19 is provided at one end of the screw shaft 8a close to the brake pad; the base 19 acts as a piston, and is subsequently combined with the inner brake pad 14 to squeeze and push the inner brake pad 14 through the push of the screw shaft 8a, and then cooperates with the outer brake pad 16 to clamp and brake the brake disc 15.

[0067] At the same time, in the present invention, the screw shaft 8a and the base 19 are connected by a fixed or detachable connection method; the screw shaft 8a and the base 19 of the present invention can be connected by a fixed connection method. Such a setting can ensure the connection strength of the connection between the screw shaft 8a and the base 19.

[0068] The use of a detachable connection method can facilitate the assembly of the brake caliper assembly during subsequent use, and the screw shaft 8a and the base 19 can be replaced with each other as needed during subsequent use, thereby improving the scope of application of the present invention. In the present invention, the screw shaft 8a and the base 19 can be connected by fixing screws or bolts; of course, they can also be connected by means of clamping or the like.

[0069] Furthermore, in the present invention, a lower opening 10 is provided on the caliper body 4; the lower opening 10 is communicated with the cylinder hole 4-1; the setting of the lower opening 10 facilitates the subsequent use, when the screw shaft 8a passes through the caliper body 4 and is connected to the inner brake pad 14; the planetary roller screw mechanism 8 in the present invention passes through the lower opening 10 and is connected to the brake pad; specifically, the screw shaft 8a in the planetary roller screw mechanism 8 of the present invention passes through the lower opening 10 and is connected to the base 19, and then is connected to the inner brake pad 14 through the base 19.

[0070] At the same time, in the present invention, a lateral opening 18 is also provided on the caliper body 4, and the torque transfer element 3 is connected to the nut 8c through the lateral opening 18; the lateral opening 18 serves as a side connection, which is convenient for subsequent use, and the torque transfer element 3 is connected to the nut 8c in the cylinder hole 4-1 through the lateral opening 18.

[0071] Furthermore, in the present invention, a positioning ring plate 12 is provided in the lower opening 10, and the positioning ring plate 12 is sleeved on the planetary roller screw mechanism 8; the positioning ring plate 12 is embedded in the lower opening 10, which is equivalent to the positioning ring plate 12 being connected in the lower opening 10; the setting of the positioning ring plate 12 can support the planetary roller screw mechanism 8 and ensure the stability of the arrangement of the planetary roller screw mechanism 8 in the cylinder bore 4-1.

[0072] At the same time, in the present invention, the positioning ring plate 12 can also play a good supporting and limiting role in the future, ensuring the stability of the position of the second thrust bearing 11.

[0073] Furthermore, the brake caliper assembly described in the present invention also includes a bearing mechanism arranged in the cylinder hole 4-1; the setting of the bearing mechanism can not only ensure the stability of the arrangement of the planetary roller screw mechanism 8 in the caliper body 4, but also reduce the friction between the planetary roller screw mechanism 8 and the inside of the cylinder hole 4-1.

[0074] In the present invention, the bearing mechanism includes a thrust bearing arranged on the nut 8c; the thrust bearing is mainly used to bear the reverse thrust of the subsequent clamping force.

[0075] In the present invention, the thrust bearing includes a first thrust bearing 6 and a second thrust bearing 11; the first thrust bearing 6 and the second thrust bearing 11 are distributed at both ends of the nut 8c, the first thrust bearing 6 is arranged at the end of the nut 8c away from the brake pad, and the second thrust bearing 11 is arranged in the area between the torque input element 9 and the positioning ring plate 12; in the present invention, the first thrust bearing 6 is the first thrust bearing 6, which is mainly arranged at the end of the nut 8c close to the controller 1, and is mainly used to bear the reverse thrust of the brake clamping force during subsequent use; and can reduce the friction between the subsequent nut 8c and the force sensor. In the present invention, the above-mentioned first thrust bearing 6 can be a thrust needle roller bearing or a ball bearing.

[0076] At the same time, a second thrust bearing 11 is provided on the side of the nut 8c close to the brake pad. The second thrust bearing 11 plays a supporting role, facilitates the support and limitation of the torsion input element 2, and ensures the stability of the arrangement of the nut 8c in the cylinder hole 4-1.

[0077] The bearing mechanism described in the present invention also includes a radial bearing 7; the side surface of the nut 8c is fitted with the inside of the cylinder hole 4-1 through the radial bearing 7; a radial bearing 7 is arranged between the nut 8c and the cylinder hole 4-1; this can avoid the nut 8c directly fitting with the inner wall of the cylinder hole 4-1 to generate sliding friction. Through the arrangement of the radial bearing 7, the sliding friction between the nut 8c and the inner wall of the cylinder hole 4-1 can be changed to rolling friction, thereby reducing the friction force on the nut 8c when it rotates.

[0078] Meanwhile, in the present invention, the radial bearing 7 is a sliding bearing, a needle bearing or a ball bearing.

[0079] Furthermore, in the present invention, the brake caliper assembly also includes an identification unit arranged in the cylinder hole 4-1; the identification unit includes a pressure identification unit 17 arranged in the cylinder hole 4-1; the pressure identification unit 17 is arranged between the planetary roller screw mechanism 8 and the inner wall of the cylinder hole 4-1; the present invention can facilitate the operator to identify the reverse thrust of the clamping force during wheel braking through the setting of the pressure identification unit 17; in the present invention, the pressure identification unit 17 can be a force sensor.

[0080] Furthermore, the planetary roller screw mechanism 8 described in the present invention is one of a differential planetary roller screw mechanism 8, a standard planetary roller screw mechanism 8, a reverse planetary roller screw mechanism 8 or a circulating planetary roller screw mechanism 8; when selecting, it can be selected according to needs.

[0081] As shown in the figure, the present invention provides a brake caliper assembly, including a brake caliper, a brake pad and an actuator, characterized in that the brake caliper includes a caliper body 4; at least one set of planetary roller screw mechanisms 8 is provided in the caliper body 4, which can convert rotational motion into linear motion so that the brake pad can perform linear motion.

[0082] Two brake pads are provided, the two brake pads are an inner brake pad 14 and an outer brake pad 16 which are arranged opposite to each other, and the brake disc 15 is located between the inner brake pad 14 and the outer brake pad 16 . During the braking process, the inner brake pad 14 and the outer brake pad 16 cooperate to clamp the brake disc 15 .

[0083] As shown in the figure, the actuator of the present invention is connected to the planetary roller screw mechanism 8 and is used to generate power to operate the planetary roller screw mechanism 8. The actuator can be arranged outside or inside the brake caliper.

[0084] In the present invention, the actuator includes an input element 2, a controller 1 and a torque transmission element 3; the input element 2 and the controller 1 of the actuator are well known to those skilled in the art, and the specific structure is not described here.

[0085] The torque transmission element 3 of the present invention is mainly used for the transmission of rotational kinetic energy. The input element 2 is generally a motor, and the motor is connected to the planetary roller screw mechanism 8 through the torque transmission element 3.

[0086] The torque transfer element 3 includes a torque input element 9, which is a gear transmission mechanism and can be an input gear. The gear transmission mechanism is used to transmit the power generated by the motor to the planetary roller screw mechanism 8, so that the planetary roller screw mechanism 8 can operate, and finally the brake pad moves linearly relative to the brake disc 15 in a direction parallel to the axial direction of the brake disc 15 to clamp or release the brake disc 15.

[0087] In the present invention, the planetary roller screw mechanism 8 is a circulating planetary roller screw mechanism 8 or a non-circulating planetary roller screw mechanism 8. The non-circulating planetary roller screw mechanism 8 is a screw input type planetary roller 8b screw mechanism, a nut 8c input type planetary roller 8b screw mechanism or a PWG type differential planetary roller screw mechanism 8, etc.

[0088] The lead of the planetary roller screw mechanism 8 is less than or equal to 5 mm, preferably less than or equal to 3 mm. With the same number of rotations of the actuator, the linear motion distance of the base 19 is shorter. According to the law of conservation of energy, a greater thrust will be generated, which can better meet the braking force requirements.

[0089] The planetary roller screw mechanism 8 is similar in structure to the ball screw, and has almost no difference in efficiency from the ball screw. However, according to Hertz's pressure law, its load-bearing capacity is three times that of the ball screw, and its life is 15 times that of the ball screw, which greatly meets the load-bearing and life requirements of the EMB.

[0090] In order to ensure the transmission accuracy of the planetary roller screw mechanism 8, the brake caliper assembly of the present invention also includes a sealing cover 13 arranged on the brake caliper; one end of the sealing cover 13 is connected to the caliper body 4, and the other end is connected to the base 19 to ensure the sealing of the brake caliper body.

[0091] A braking system comprises the brake caliper assembly.

[0092] A vehicle comprises the braking system.

[0093] specific:

[0094] The present invention discloses a brake caliper assembly, which at least comprises a brake caliper, a brake pad, an actuator, a speed reduction and torque increase mechanism and a planetary roller screw mechanism 8.

[0095] In the present invention, the actuator includes a controller 1, and the planetary roller screw mechanism 8 includes at least a rotating part and a translational part. The controller 1 is arranged on the same side of the input element 2 and the planetary roller screw mechanism 8, and the planetary roller 8b screw is arranged in the cylinder hole 4-1 of the brake caliper; the nut 8c is a rotating part, and the screw shaft 8a is a translational part; one end of the screw shaft cooperates with the inner brake block, and the other end can be arranged in the caliper body 4 or pass through the caliper body 4 to enter the controller housing 1-1 of the controller 1. At the same time, an anti-rotation element 5 is provided on the caliper body 4 or the controller housing 1-1 to cooperate with the screw shaft 8a to limit the rotation of the screw shaft 8a.

[0096] In the present invention, one end of the screw shaft 8a can partially pass through or completely penetrate the first thrust bearing 6 and / or the force sensor, and / or the head of the caliper body 4, and / or the controller housing 1-1. The length of the screw shaft 8a can be designed to different lengths according to needs, so as to adapt to friction plates or brake discs 15 of different thicknesses.

[0097] In the present invention, the passive element of the last stage transmission pair of the torque transmission element 3 is a torque input element 9, and the inner hole of the torque input element 9 is fixedly connected to the outer wall of the nut 8c.

[0098] A first thrust bearing 6 is disposed at one end of the nut 8c for bearing the reverse thrust of the clamping force. The first thrust bearing 6 is a thrust needle roller bearing or a ball bearing.

[0099] On one side of the torque input element 9, a radial bearing 7 is provided between the nut 8c and the cylinder hole 4-1. The radial bearing 7 is a sliding bearing, a needle bearing or a ball bearing.

[0100] A second thrust bearing 11 is disposed on the other side of the torque input element 9 , and the second thrust bearing 11 is a thrust needle roller bearing or a ball bearing.

[0101] In the present invention, the second thrust bearing 11 is fixed to the brake caliper via a positioning ring plate 12. The positioning ring plate 12 and the brake caliper are interference-connected, and the inner hole of the positioning ring plate 12 is clearance-fitted with the outer wall of the nut 8c.

[0102] A force sensor is provided on a side of the first thrust bearing 6 away from the inner brake pad 14 .

[0103] When the anti-rotation element 5 is connected to the caliper body 4, in the present invention, the screw shaft 8a has a spline hole, and the caliper body 4 has a through hole, in which the anti-rotation element 5 is arranged; the head of the anti-rotation element 5 has a spline that matches the spline hole of the screw shaft 8a; the anti-rotation element 5 and the through hole are interference fit.

[0104] When the anti-rotation element 5 is disposed on the controller housing 1 - 1 , the screw shaft 8 a is required to extend through the through hole on the caliper body 4 to the inside of the controller housing 1 - 1 .

[0105] In the present invention, a sealing cover 13 is provided between the base 19 and the brake caliper.

[0106] In the present invention, the caliper body 4 has two cavities, one cavity is the above-mentioned cylinder hole 4-1, which is used to place the planetary roller screw mechanism 8, and the other cavity is used to place components such as the input element 2. The two cavities are connected using a lateral opening 18, and a deceleration and torque increase mechanism is arranged at the lateral opening 18.

[0107] In the present invention, the planetary roller 8b screw can be a differential type, a standard type, a reverse type or a circulating type; the screw shaft 8a is coaxially arranged with the torque input element 9, and the torque input element 9 can be a pulley, a worm gear, or a gear.

[0108] The present invention uses a planetary roller screw mechanism 8, followed by a driving nut 8c, and a screw shaft 8a to push the brake pad forward. The screw shaft 8a can be made small in diameter and pass through the thrust needle roller bearing, the caliper body 4, and even the ECU and the circuit board. The screw can pass through the caliper body 4 and enter the controller 1, so that the space inside the controller 1 can be fully utilized, thereby utilizing the axial space in parallel and shortening the axial dimension of the caliper assembly. The length of the screw shaft can be designed to different lengths according to requirements to adapt to friction plates or brake discs 15 of different thicknesses. In addition, the small diameter of the screw shaft 8a can reduce the diameter of the thrust needle roller bearing and the diameter of the cylinder hole 4-1, thereby reducing the radial dimension of the caliper assembly and being more conducive to layout on the entire vehicle.

[0109] The present invention discloses a brake caliper assembly, the main structure of which includes an actuator, a brake caliper, and a motion conversion mechanism. The actuator includes an input element 2, a controller 1, and a torque transmission element 3. The passive gear of the last-stage gear pair of the torque transmission element 3, namely, the input gear, is fixed to the outside of the rotating part of the motion conversion mechanism. The motion conversion mechanism is a planetary roller screw mechanism 8, wherein the rotating part is a nut 8c, the translation part is a screw shaft 8a, and one end face of the screw shaft at least passes through the nut 8c and the passive gear of the last-stage gear pair of the gear mechanism. The screw shaft is prevented from rotating by an anti-rotation screw to ensure its linear motion. The motion conversion mechanism converts the torque and rotation speed of the rotating part into the linear motion and thrust of the translation part, which directly pushes the brake pad to clamp the brake disc 15.

[0110] The advantage of the present invention is that by replacing the ball screw with a planetary roller screw mechanism 8, the load-bearing capacity and transmission accuracy of the brake caliper are increased to meet the requirements of long-term use. At the same time, the axial size of the screw shaft is variable and there are multiple anti-rotation structures arranged.

[0111] In the present invention, a planetary roller 8b screw is used, and its function is the same as that of a ball screw mechanism, that is, both convert rotational motion into linear motion. The difference is that the load element of the planetary roller 8b screw is a threaded roller 8b, which is a line contact; while the load transfer element of the ball screw is a ball, which is a point contact. Using threaded rollers 8b instead of balls will allow the load to be quickly released through numerous contact points, thereby allowing the planetary roller 8b screw to have higher load resistance and impact resistance; the general load can reach 3 times that of a ball screw of the same specification, and the life of the planetary roller 8b screw is 15 times that of a ball screw, which greatly increases durability.

[0112] In the present invention, the diameter of the screw shaft 8a is relatively small, which reduces the friction torque of the needle bearing arranged on the screw shaft 8a, increases the life of the ball screw, and the contact area of ​​the force sensor is small, which can increase the accuracy of the force sensor and reduce the radial size of the brake caliper cavity; its end face at least passes through the nut 8c and the passive gear of the last gear pair of the gear mechanism, and the anti-rotation element 5 can be installed on the brake caliper or on the controller 1.

[0113] The following is an explanation based on specific implementation cases:

[0114] Implementation case 1:

[0115] like Figure 1 As shown, the brake caliper at least includes an actuator, a brake caliper, and a motion conversion mechanism, wherein: the actuator at least includes a controller 1, an input element 2, and a torque transfer element 3, and the passive gear of the last-stage gear pair of the torque transfer element 3 is the input gear; the actuator is an existing mature technology and will not be described in detail here.

[0116] The motion conversion mechanism is a planetary roller 8b screw, which at least includes a rotating part and a translational part. The rotating part is a nut 8c, the translational part is a screw shaft 8a, and the transmission part is a threaded roller 8b. The nut 8c is annular with openings at both ends. The cross-section of the screw shaft 8a and the base 19 is T-shaped. The nut 8c has an internal thread, and the screw shaft 8a has an external thread. There is a roller 8b between the screw shaft 8a and the nut 8c. The end of the screw shaft 8a has an anti-rotation groove 8a1 that cooperates with the anti-rotation screw. The anti-rotation groove 8a1 ensures that the screw shaft 8a can perform linear motion. The screw and the base 19 are fixed by screws. The inner ring of the input gear and the outer ring of the nut 8c are interference connected, and the input gear and the nut 8c rotate synchronously.

[0117] The brake caliper has a cavity and a hook, an inner brake pad 14, a brake disc 15 and an outer brake pad 16 are arranged between the cavity and the hook in sequence. At the same time, the brake caliper includes a caliper body 4, a cylinder hole 4-1 is provided in the caliper body 4, a planetary roller screw mechanism 8 is arranged in the cylinder hole 4-1, and the cylinder hole 4-1 has a lower opening 10 and a lateral opening 18.

[0118] The opening direction of the lower opening 10 faces the inner brake pad 14 , the screw shaft 8a passes through the lower opening 10 and directly fits with the inner brake pad 14 , the side of the cavity close to the lower opening 10 has a lateral opening 18 , and the torque transmission element 3 passes through the lateral opening 18 .

[0119] A positioning ring plate 12 is installed at the mouth of the lower opening 10 of the cavity, and its connection method is interference fit, which is used to fix the planetary roller 8b, lead screw, bearings and other components.

[0120] The end surface of the brake caliper away from the hook has an opening for arranging an anti-rotation element 5 , which may be an anti-rotation screw.

[0121] A bearing mechanism is arranged between the outer side of the nut 8c and the inner wall of the cylinder hole 4-1 of the brake caliper, and the bearing mechanism can be a needle bearing, a deep groove ball bearing or other radial bearing 7; the radial bearing 7 converts the sliding friction between the nut 8c and the cavity into rolling friction, ensuring that the nut 8c can rotate smoothly, and a first thrust bearing 6 is arranged between the end of the nut 8c away from the hook and the top of the cylinder hole 4-1 of the brake caliper. The first thrust bearing 6 is a thrust needle roller bearing, which is arranged between the planetary roller screw mechanism 8 and the inner wall of the cylinder hole 4-1 of the brake caliper. The thrust needle roller bearing is an axial support bearing, which is used to bear the axial load of the motion conversion mechanism, and at the same time converts the sliding friction between the nut 8c and the force sensor into rolling friction, ensuring that the nut 8c can rotate smoothly.

[0122] A second thrust bearing 11 is provided on one side of the input gear close to the inner brake pad 14 . The bearing is a thrust needle roller bearing. One side of the thrust needle roller bearing cooperates with the end face of the input gear, and the other side cooperates with the end face of the positioning ring plate 12 .

[0123] The screw shaft 8a of the planetary roller 8b screw passes through the first thrust needle bearing and does not contact the inner wall of the brake caliper cavity. A sealing groove is provided on the base 19, and a sealing cover 13 is installed between the brake caliper and the base 19 to ensure the sealing of the brake caliper.

[0124] The anti-rotation screw is fixed on the brake caliper and cooperates with the spline of the inner hole of the screw shaft 8a, so that it can only perform linear motion but not rotational motion.

[0125] Implementation case 2:

[0126] like Figure 2 As shown, the structure of the brake caliper provided in this embodiment differs from that of the brake caliper provided in the first embodiment in that the size of the screw shaft 8a in the planetary roller screw mechanism 8 in this embodiment is different and the arrangement of the anti-rotation element 5 is different.

[0127] The lead screw shaft 8a passes through the caliper body 4 of the brake caliper and enters the controller 1. The anti-rotation screw is arranged on the controller housing 1-1 and cooperates with the spline groove of the inner hole of the lead screw shaft 8a to prevent rotation. The axial dimension of the anti-rotation screw is larger than that of the first embodiment to prevent it from slipping out of the inner hole of the lead screw shaft 8a and causing the anti-rotation structure to fail.

[0128] Implementation case three:

[0129] like Figure 3 As shown, the structure of the brake caliper provided in this embodiment differs from that of the brake caliper provided in the first embodiment in that the caliper in this embodiment is arranged with a force sensor, wherein the force sensor is arranged between the first thrust bearing 6 and the inner wall of the brake caliper.

[0130] The arrangement is provided with a force sensor, which can monitor the value of the clamping force of the caliper in real time and can facilitate the control of the caliper.

[0131] 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 brake caliper assembly, comprising a brake caliper, a brake pad and an actuator, characterized in that: The brake caliper comprises a caliper body; the caliper body is provided with at least one set of planetary roller screw mechanisms capable of converting rotational motion into linear motion to enable the brake pad to perform linear motion; The planetary roller screw mechanism comprises a screw shaft, a nut and a roller; The roller is sleeved on the screw shaft, and the nut is sleeved on the roller; The actuator controls the rotation of the nut; the nut can drive the screw shaft to perform linear motion through the roller.

2. A brake caliper assembly according to claim 1, characterized in that: A cylinder hole is provided in the caliper body; the planetary roller screw mechanism is inserted in the cylinder hole; the screw shaft in the planetary roller screw mechanism is arranged in the cylinder hole and extends toward the brake pad and / or the actuator.

3. A brake caliper assembly according to any one of claims 1 to 2, characterized in that: The planetary roller screw mechanism further includes an anti-rotation component, which includes an anti-rotation element connected to the screw shaft; the anti-rotation element can limit the rotation of the screw shaft; the anti-rotation element is connected to the actuator or the caliper body and is connected to the screw shaft; The screw shaft comprises a shaft body, an anti-rotation groove is provided on the shaft body, and the anti-rotation element is inserted into the anti-rotation groove.

4. A brake caliper assembly according to claim 1, characterized in that: The actuator is connected to the nut via a torque transmission element; the torque transmission element can drive the nut to rotate.

5. A brake caliper assembly according to claim 4, characterized in that: The nut comprises a nut body; a connecting ring groove is provided on the nut body, and the connecting ring groove is arranged at one end of the nut body close to the brake pad; and the torque input element in the torque transmission element is arranged in the connecting ring groove.

6. A brake caliper assembly according to claim 1, characterized in that: A base is provided at one end of the screw shaft close to the brake pad; the screw shaft and the base are connected in a fixed or detachable manner; The relative positions of the screw shaft and the base are fixed during operation.

7. The brake caliper assembly according to claim 1, characterized in that: The caliper body is provided with a lower opening; the lower opening is communicated with the cylinder hole; the planetary roller screw mechanism is connected with the brake pad through the lower opening; the caliper body is also provided with a lateral opening, and the torque transfer element is connected with the nut through the lateral opening.

8. A brake caliper assembly according to claim 7, characterized in that: A positioning ring plate is arranged in the lower opening, and the positioning ring plate is sleeved on the planetary roller screw mechanism.

9. The brake caliper assembly according to claim 1, characterized in that: The brake caliper assembly also includes a bearing mechanism arranged in the cylinder hole; the bearing mechanism includes a thrust bearing arranged on the nut.

10. A brake caliper assembly according to claim 9, characterized in that: The thrust bearing comprises a first thrust bearing and a second thrust bearing; the first thrust bearing and the second thrust bearing are distributed at both ends of the nut, the first thrust bearing is arranged at the end of the nut away from the brake pad, and the second thrust bearing is arranged in the area between the torque input element and the positioning ring plate; The bearing mechanism also includes a radial bearing; the side surface of the nut fits with the inside of the cylinder hole through the radial bearing.

11. The brake caliper assembly according to claim 1, characterized in that: The brake caliper assembly further comprises an identification unit arranged in the cylinder hole; the identification unit comprises a pressure identification unit arranged in the cylinder hole; the pressure identification unit is arranged between the planetary roller screw mechanism and the inner wall of the cylinder hole.

12. The brake caliper assembly according to claim 1, characterized in that: The planetary roller screw mechanism is one of a differential planetary roller screw mechanism, a standard planetary roller screw mechanism, a reverse planetary roller screw mechanism or a circulating planetary roller screw mechanism.

13. A braking system, characterized in that: Comprising a brake caliper assembly as described in any one of claims 1-12.

14. A vehicle, characterized in that: Comprising a braking system as claimed in claim 13.

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