Electro-mechanical brake system with longitudinally arranged electric motor shaft, and vehicle

Abstract

Provided in the present application are an electro-mechanical brake system with a longitudinally arranged electric motor shaft, and a vehicle. The electro-mechanical brake system comprises a braking electric motor, a speed reducer, a transmission mechanism, a caliper, and a caliper bracket, wherein the caliper is slidably connected to the caliper bracket by means of a guide rod and is used for driving friction pads to brake a brake disc; and an electric motor shaft of the braking electric motor is longitudinally arranged relative to the guide rod and drives the caliper to slide along the guide rod relative to the caliper bracket by means of the speed reducer and the transmission mechanism. In the electro-mechanical brake system of the present application, the electric motor shaft of the braking electric motor is longitudinally arranged to adapt to the wheel-side space of the vehicle, such that the arrangement of the vehicle is more compact, thereby facilitating miniaturization of the vehicle.

Description

Electromechanical brake system and vehicle with longitudinal motor shaft

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on December 29, 2023, with application number 202311863111.0, and priority to the Chinese patent application entitled "Electronic mechanical braking system and vehicle with longitudinal motor shaft", all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of vehicle technology, and in particular to an electronic mechanical braking system with a longitudinally arranged motor shaft and a vehicle. Background Art

[0003] Electromechanical brakes (EMBs) utilize a brake motor and mechanical transmission mechanism to drive the brakes. EMBs offer a simple structure, responsiveness, smooth load transfer, and high transmission efficiency without the need for hydraulic piping. They can enhance vehicle safety, handling, and comfort. EMBs are also trending towards miniaturization to accommodate wheel space.

[0004] Summary of the Invention

[0005] This application provides an electronic mechanical brake system with a longitudinally mounted motor shaft and a vehicle. By placing the brake motor shaft longitudinally to fit within the wheel space of the vehicle, the vehicle layout becomes more compact, facilitating vehicle miniaturization. This application specifically includes the following solutions:

[0006] In a first aspect, the present application provides an electromechanical brake system, which includes a brake motor, a reducer, a transmission mechanism, a caliper body, and a caliper frame, wherein: the caliper body is slidably connected to the caliper frame via a guide rod and is used to drive the friction pad to brake the brake disc;

[0007] The motor shaft of the brake motor is arranged longitudinally relative to the guide rod and drives the caliper body to slide relative to the caliper frame along the guide rod through the reducer and the transmission mechanism.

[0008] The electronic mechanical brake system of the present application uses a brake motor to drive a reducer and a transmission mechanism, transmitting power to the caliper body to drive the caliper body to slide along a guide rod relative to the caliper frame, thereby driving the friction pad brake disc. Because the axial dimension of the brake motor is relatively large, the motor shaft of the brake motor in the electronic mechanical brake system of the present application is arranged longitudinally along the guide rod, that is, the motor shaft of the brake motor is arranged longitudinally along the sliding direction of the caliper body relative to the caliper frame. This can shorten the length dimension of the electronic mechanical brake system along the sliding direction of the caliper body and the caliper frame, facilitate the arrangement and installation of the electronic mechanical brake system in the vehicle, leave installation space for the vehicle's suspension and other structures, and make the internal structure of the vehicle more compact, achieving miniaturization.

[0009] In one implementation, the electronic mechanical brake system includes two guide rods, which are spaced relatively and arranged in parallel. The distance between the two guide rods is greater than the outer diameter of the brake motor. The caliper body is slidably connected to the caliper frame through the two guide rods.

[0010] In this implementation, the caliper body is slidably connected to the caliper frame through two guide rods. The brake motor is located between the two guide rods along the arrangement direction of the two guide rods, and the spacing distance between the two guide rods is greater than the outer diameter of the brake motor. This can ensure that the caliper body slides smoothly relative to the caliper frame when driven by the brake motor, thereby improving the reliability of the electronic mechanical braking system.

[0011] In one implementation, the arrangement direction of the two guide rods is perpendicular to the axial direction of the motor shaft, and the extension direction of the two guide rods is perpendicular to the axial direction of the motor shaft.

[0012] In this implementation, the axial direction of the motor shaft is perpendicular to the extension direction of the guide rod and the arrangement direction of the two guide rods. The brake motor is longitudinally arranged relative to the sliding direction of the caliper body and the caliper frame, and longitudinally arranged relative to the arrangement direction of the guide rods.

[0013] In one implementation, two guide rods are symmetrically arranged along the axis of the motor shaft. In this implementation, the two guide rods are arranged longitudinally and symmetrically along the motor shaft. The power output by the motor shaft acts on the caliper in the longitudinal direction, which can ensure that the force on the caliper along the arrangement direction of the guide rods is balanced.

[0014] In one implementation, one of the caliper frame or the caliper body includes a guide hole, the opening of each guide hole is oriented in the longitudinal direction of the motor shaft, and each guide hole is used to accommodate one end of a guide rod;

[0015] The other end of the caliper frame or caliper body is used to fix the other end of the connecting guide rod.

[0016] In this implementation, the guide rod is fixed to the caliper body or caliper frame along the longitudinal direction of the motor shaft, and cooperates with the guide hole coaxially sleeved on the caliper frame or caliper body to form a sliding connection between the caliper body and the caliper frame along the longitudinal direction of the motor shaft.

[0017] In one implementation, the housing of the reducer is used to be fixed to the housing of the brake motor along the axial direction of the motor shaft, and the reducer is located on the side of the brake motor close to the center of the brake disc along the axial direction of the brake motor.

[0018] In this implementation, the reducer is close to the center of the brake disc, which prevents the brake motor from being raised radially along the brake disc and rationally utilizes the wheel end space of the vehicle.

[0019] In one implementation, the reducer includes an output wheel and a planetary gear set. The output wheel is used to connect to the motor shaft of the brake motor through the planetary gear set. The output wheel is used to drive the transmission mechanism. The distance between the output wheel and the stator of the brake motor along the axis of the brake motor is smaller than the distance between the planetary gear set and the stator of the brake motor. The motor shaft of the brake motor is used to pass through the inner hole of the output wheel to connect to the planetary gear set.

[0020] In this implementation, the output wheel and the planetary gear set are both coaxially driven with the motor shaft, and the output wheel is closer to the stator of the brake motor than the planetary gear set, and the reducer is closer to the center of the brake disc, thereby avoiding the brake motor from being raised radially along the brake disc and rationally utilizing the wheel end space of the vehicle.

[0021] One implementation method includes a swing arm and an eccentric wheel, wherein:

[0022] The swing arm is used to transmit and connect the reducer and the eccentric wheel. The brake motor drives the swing arm to swing in a clockwise or counterclockwise direction through the reducer. The swing arm drives the eccentric wheel to rotate in a clockwise or counterclockwise direction. The eccentric wheel is used to transmit and connect the friction plate.

[0023] In this implementation, the rotation axis of the eccentric wheel is parallel to the output wheel and spaced along the longitudinal direction of the motor shaft. The swing arm is arranged along the longitudinal direction of the motor shaft. The swing arm is used to transmit the rotational motion of the output wheel to the eccentric wheel and drive the eccentric wheel to rotate synchronously with the output wheel.

[0024] In one implementation, the transmission mechanism includes a slider, which is arranged between an eccentric wheel and a friction plate along the longitudinal direction of the motor shaft. The brake motor is used to drive the eccentric wheel to rotate, and the eccentric part of the eccentric wheel is used to push the slider and a friction plate along the longitudinal direction of the motor shaft.

[0025] In this implementation, the transmission mechanism connects the swing arm and the slider via an eccentric transmission, and the swing arm is used to drive the eccentric to rotate to push the slider and a friction plate to slide toward the brake disc.

[0026] In one implementation, one end of the longitudinal swing arm along the motor shaft is fixedly connected to the eccentric wheel, and the other end of the longitudinal swing arm along the motor shaft is engaged with the output wheel of the reducer.

[0027] In one implementation, an electromechanical brake system includes a circuit board, the circuit board is used to carry a drive circuit, and the drive circuit is used to drive a brake motor, wherein:

[0028] The thickness direction of the circuit board is parallel to the axial direction of the motor shaft.

[0029] In this implementation, the thickness direction of the circuit board is parallel to the axial direction of the motor shaft, which can shorten the size of the electronic mechanical brake system along the axial direction of the motor shaft and facilitate the arrangement of the electronic mechanical brake system.

[0030] In one implementation, the housing of the brake motor is used to accommodate the circuit board.

[0031] In this implementation, the circuit board can be housed in the housing of the brake motor for sealed protection.

[0032] In one implementation, the circuit board and the reducer are arranged on both sides of the stator of the brake motor along the axial direction of the motor shaft.

[0033] In this implementation, the circuit board and the planetary gear set are arranged on both sides of the brake motor stator along the axial direction of the motor shaft. The circuit board can be set close to the stator and rotor of the brake motor, shortening the signal transmission path between the circuit board and the brake motor and improving reliability.

[0034] In one implementation, the housing of the brake motor includes a partition, and along the axial direction of the motor shaft, the circuit board, the partition, and the stator of the brake motor are arranged in sequence.

[0035] In this implementation, the partition is used to form a sealed protection for the circuit board to prevent the oil in the brake motor or reducer from contaminating the circuit board.

[0036] In one implementation, the length direction of the circuit board is parallel to the longitudinal direction of the motor shaft, and the length direction of the circuit board intersects with the sliding direction of the friction plate.

[0037] In this implementation, the length direction of the circuit board intersects with the sliding direction of the friction plate, which can shorten the length dimension of the electronic mechanical brake system along the sliding direction of the friction plate.

[0038] In one implementation, the electromechanical brake system includes a position sensor for detecting the rotation angle of the brake motor. The position sensor includes a stator and a rotor, wherein:

[0039] The circuit board is used to fix the stator of the position sensor;

[0040] The motor shaft is used to coaxially drive the rotor of the position sensor.

[0041] In this implementation, the electronic mechanical brake system detects the rotation angle of the brake motor through a position sensor, and then controls the thrust of the friction plate driven by the electronic mechanical brake system to achieve control of the vehicle's braking force.

[0042] In one implementation, the electronic mechanical braking system includes two friction plates, which are arranged on both sides of the brake disc along the longitudinal direction of the motor shaft. The transmission mechanism drives the two friction plates to slide relative to each other along the longitudinal direction of the motor shaft to brake the brake disc.

[0043] In one implementation, the pliers body includes a main body, a pushing part, and a connecting part, wherein the connecting part is used to fixedly connect the main body and the pushing part, wherein:

[0044] Two friction plates are arranged between the main body and the pushing part along the longitudinal direction of the motor shaft;

[0045] The main body is used for sliding connection with one friction plate, and the pushing part is used for fixed connection with the other friction plate.

[0046] In this implementation, the brake motor is fixed to the main body along the longitudinal direction of the motor shaft. The brake motor is used to drive one friction plate through a transmission mechanism and drive another friction plate through the pushing part of the caliper body, so that the two friction plates slide relative to each other along the longitudinal direction of the motor shaft to brake the brake disc.

[0047] In one implementation, the main body includes a receiving groove, the receiving groove is used to partially receive the transmission mechanism, and the opening of the receiving groove faces in the longitudinal direction of the motor shaft.

[0048] In this implementation, the receiving groove is used to accommodate the eccentric wheel, the slider, and one end of the swing arm, and the other end of the swing arm extends into the reducer to engage with the output wheel.

[0049] In a second aspect, the present application provides a vehicle comprising a brake pedal, a wheel, and an electromechanical brake system provided by any of the above implementations, wherein the brake pedal is used to control at least one electromechanical brake system to drive a friction plate toward or away from a brake disc of the wheel.

[0050] Because the electronic mechanical braking system provided in the first aspect of the present application places the motor shaft longitudinally to fit the wheel side space of the vehicle, the internal structure of the vehicle of the present application is arranged more compactly, which is conducive to miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0052] FIG1 is a schematic diagram of a working scenario of an electromechanical braking system in a vehicle provided by an embodiment of the present application;

[0053] FIG2 is a schematic diagram of the external structure of an electronic mechanical braking system provided in an embodiment of the present application;

[0054] FIG3 is a schematic diagram of the exploded structure of the electromechanical braking system provided in an embodiment of the present application;

[0055] FIG4 is a schematic diagram of the exploded structure of the electronic mechanical braking system provided in an embodiment of the present application from another perspective;

[0056] FIG5 is a schematic side cross-sectional view of the electromechanical braking system according to an embodiment of the present application;

[0057] FIG6 is a schematic diagram of the exploded structure of a speed reducer in an electromechanical braking system according to an embodiment of the present application;

[0058] FIG7 is a schematic cross-sectional view of a brake motor and a reducer in an electronic mechanical brake system according to an embodiment of the present application;

[0059] FIG8 is a schematic diagram of the transmission mechanism structure in the electronic mechanical braking system provided in an embodiment of the present application;

[0060] FIG9 is a schematic diagram of the exploded structure of the transmission mechanism in the electronic mechanical braking system provided in an embodiment of the present application;

[0061] FIG10 is a schematic cross-sectional view of another embodiment of a transmission mechanism in an electronic mechanical braking system provided in an embodiment of the present application;

[0062] FIG11 is a schematic diagram of a partial structure of a position sensor in an electronic mechanical braking system provided by an embodiment of the present application;

[0063] FIG12 is a partial structural diagram of another coordination mode of the position sensor in the electronic mechanical braking system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0064] The following will describe the technical solutions in the embodiments of this application in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of this application.

[0065] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" mentioned in this application includes direct and indirect connections unless otherwise specified. In the description of this application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0066] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above" or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below" or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0067] The present application provides an electronic mechanical braking system with a longitudinally positioned motor shaft. The electronic mechanical braking system includes a brake motor, a speed reducer, a transmission mechanism, a caliper body, and a caliper frame. The caliper body is slidably connected to the caliper frame via a guide rod and is used to drive the friction pads to brake the brake disc. The motor shaft of the brake motor is longitudinally positioned relative to the guide rod and is driven by the speed reducer and transmission mechanism to slide the caliper body along the guide rod relative to the caliper frame. By longitudinally positioning the motor shaft of the brake motor to accommodate the wheel side space of the vehicle, the electronic mechanical braking system of the present application makes the vehicle layout more compact, thereby facilitating vehicle miniaturization.

[0068] The present application provides a vehicle comprising a brake pedal, a wheel, and the aforementioned electromechanical brake system, wherein the brake pedal is used to control at least one electromechanical brake system to drive a friction plate toward or away from a brake disc of the wheel. The internal structure of the vehicle of the present application is compactly arranged.

[0069] Please refer to FIG1 , which provides a schematic diagram of a working scenario of an electronic mechanical braking system 100 of the present application in a vehicle.

[0070] As shown in FIG1 , the electronic mechanical brake system 100 with a longitudinally arranged motor shaft provided in the present application is arranged at the wheel of the vehicle, specifically corresponding to the brake disc 201 of the wheel. The electronic mechanical brake system 100 includes a caliper frame 104 and a brake assembly. The caliper frame 104 is fixed to the vehicle frame and is close to the brake disc 201. During the driving process of the vehicle, the brake disc 201 rotates with the wheel, and the caliper frame 104 is fixed relative to the frame, creating the effect that the brake disc 201 rotates relative to the caliper frame 104.

[0071] The brake assembly is connected to the caliper frame 104. Its internal mechanism allows it to slide relative to the caliper frame 104 (i.e., the vehicle frame). The sliding direction of the brake assembly's internal mechanism relative to the caliper frame 104 is parallel to the axial direction of the brake disc 201. This sliding movement of the brake assembly relative to the caliper frame 104 creates frictional contact with the brake disc 201, which in turn applies the brake force.

[0072] Please refer to Figure 2 for a schematic diagram of the external structure of an electronic mechanical braking system 100 of the present application, and refer to Figures 3 and 4 for schematic diagrams of the decomposed structure of the electronic mechanical braking system 100 at two different perspectives, and Figure 5 for a schematic diagram of the side cross-sectional structure of the electronic mechanical braking system 100.

[0073] As shown in Figures 2 to 5, the brake assembly in the electronic mechanical brake system 100 of the present application includes a caliper body 103, two friction plates (defined as a first friction plate 101 and a second friction plate 102 in this embodiment), a brake motor 110, a reducer 120, and a transmission mechanism 130. The caliper body 103 serves as the main structure of the brake assembly and is slidably connected to the caliper frame 104. The brake motor 110 is fixed to the caliper body 103, and the reducer 120 and the transmission mechanism 130 are used for transmission connection between the brake motor 110 and the two friction plates. The brake motor 110 drives the caliper body 103 through the reducer 120 and the transmission mechanism 130, and drives the friction plates to slide to brake the brake disc 201.

[0074] Brake motor 110 includes a stator 111, a rotor (illustrated together with stator 111 in the figure), a motor shaft 113, and a housing 114. Stator 111 and rotor are coaxially arranged. Motor shaft 113 is fixed to the rotor of brake motor 110, with the axis of motor shaft 113 coinciding with the axes of the rotor and stator 111. Housing 114 is used to secure stator 111. Stator 111 drives the rotor to rotate within housing 114, thereby driving coaxial rotation of motor shaft 113.

[0075] In the electronic mechanical brake system 100 of the present application, the housing 114 is fixed to the caliper body 103 along the longitudinal direction of the motor shaft 113 (ie, the radial direction of the motor shaft 113 ). The brake motor 110 slides relative to the caliper frame 104 along with the caliper body 103 .

[0076] Specifically, in the diagram, the caliper frame 104 includes a guide rod 105, and the caliper body 103 includes a guide hole 106. One end of the guide rod 105 is fixed to the caliper frame 104, and the other end extends longitudinally along the motor shaft 113. The guide hole 106 of the caliper body 103 is coaxially sleeved on the outside of the guide rod 105. The caliper body 103 is slidably connected to the caliper frame 104 via the guide rod 105 and is used to drive the first friction plate 101 and the second friction plate 102 to brake the brake disc 201. It can be understood that the sliding direction of the caliper body 103 and the caliper frame 104 is parallel to the extension direction of the guide rod 105, that is, the caliper body 103 also slides relative to the caliper frame 104 along the longitudinal direction of the motor shaft 113.

[0077] The housing 114 of the brake motor 110 is fixed to the caliper body 103 along the longitudinal direction of the motor shaft 113. In one embodiment, the alignment of the housing 114 of the brake motor 110 and the caliper body 103 is parallel to the sliding direction between the caliper body 103 and the caliper frame 104. The motor shaft 113 of the brake motor 110 is longitudinally positioned relative to the guide rod 105, and the caliper body 103 is driven to slide along the guide rod 105 relative to the caliper frame 104 via the speed reducer 120 and the transmission mechanism 130.

[0078] Please refer to Figure 5. For the electronic mechanical brake system 100 of the present application, the first friction plate 101 and the second friction plate 102 are also arranged along the longitudinal direction of the motor shaft 113. And along the longitudinal direction of the motor shaft 113, the first friction plate 101 and the second friction plate 102 are arranged on both sides of the brake disc 201. In one embodiment, the arrangement direction of the first friction plate 101 and the second friction plate 102 is parallel to the axial direction of the brake disc 201. The brake motor 110 drives the first friction plate 101 and the second friction plate 102 to slide relative to each other along the axial direction of the brake disc 201 through the reducer 120 and the transmission mechanism 130. The first friction plate 101 and the second friction plate 102 slide toward the brake disc 201 from both sides along the longitudinal direction of the motor shaft 113 and contact the brake disc 201 to brake the brake disc 201.

[0079] In one embodiment, the housing 114 of the brake motor 110 and the caliper body 103 are aligned parallel to the axial direction of the brake disc 201. In another embodiment, the guide rod 105 extends in a direction similarly parallel to the axial direction of the brake disc 201. In other words, the sliding direction of the caliper body 103 relative to the caliper frame 104 is parallel to the axial direction of the brake disc 201.

[0080] Therefore, in one embodiment, the arrangement direction of the housing 114 of the brake motor 110 and the caliper body 103, the sliding direction of the caliper body 103 relative to the caliper frame 104, and the arrangement direction of the first friction plate 101 and the second friction plate 102 are all parallel to the axial direction of the brake disc 201. Correspondingly, the axial direction of the motor shaft 113 intersects the axial direction of the brake disc 201. In this case, the arrangement direction of the housing 114 of the brake motor 110 and the caliper body 103, the sliding direction of the caliper body 103 relative to the caliper frame 104, and the arrangement direction of the first friction plate 101 and the second friction plate 102 are all arranged along the longitudinal direction of the motor shaft 113.

[0081] The axial dimension of the brake motor 110 is relatively large, and the axial direction of the motor shaft 113 is arranged to intersect with the axial direction of the brake disc 201. This can shorten the external dimensions of the electronic mechanical brake system 100 along the axial direction of the brake disc 201, thereby facilitating the arrangement of the electronic mechanical brake system 100 within the vehicle and avoiding the suspension arrangement of the vehicle being affected by the excessive axial dimension of the electronic mechanical brake system 100 along the brake disc 201. The electronic mechanical brake system 100 of the present application can save wheel space on the vehicle. Because the vehicle of the present application adopts the electronic mechanical brake system 100 of the present application, its internal structure is arranged more compactly, which is conducive to miniaturization of the vehicle.

[0082] In one embodiment, the axial direction of the motor shaft 113 is perpendicular to the axial direction of the brake disc 201. The arrangement direction of the housing 114 of the brake motor 110 and the caliper body 103, the sliding direction of the caliper body 103 relative to the caliper frame 104, and the arrangement direction of the first friction plate 101 and the second friction plate 102 are all arranged perpendicular to the axial direction of the motor shaft 113. In this case, the axial direction of the brake motor 110 is perpendicular to the axial direction of the brake disc 201, and the axial dimension of the brake motor 110 along the brake disc 201 is relatively small, which is beneficial to the arrangement of the vehicle suspension.

[0083] In one embodiment, there are at least two guide rods 105, which are fixed to the caliper frame 104 at intervals. Each guide rod 105 extends parallel to the longitudinal direction of the motor shaft 113. The caliper body 103 is provided with at least two guide holes 106, which are arranged in a one-to-one correspondence with the at least two guide rods 105. Each guide hole 106 is used to coaxially sleeve a guide rod 105. Thus, the caliper body 103 is slidably connected to the caliper frame 104 via the at least two guide rods 105. The cooperation between the multiple guide holes 106 and the guide rods 105 ensures that the caliper body 103 slides more smoothly relative to the caliper frame 104.

[0084] In the illustrated embodiment, the caliper body 103 is provided with two guide holes 106, each coaxially sleeved on a guide rod 105, forming a structure of two pairs of mutually cooperating guide rods 105 and guide holes 106. Specifically, the caliper frame 104 includes two guide rods 105, which are spaced apart and arranged in parallel with each other. The caliper body 103 is slidably connected to the caliper frame 104 via the two guide rods 105. Along the longitudinal direction of the motor shaft 113, the distance between the two guide rods 105 is greater than the outer diameter of the brake motor 110. The two guide rods 105 of the caliper frame 104 are arranged on either side of the brake motor 110. Specifically, one guide rod 105, the brake motor 110, and the other guide rod 105 are arranged in sequence along the longitudinal direction of the motor shaft 113. In the illustrated diagram, the arrangement direction of the two guide rods 105 intersects the sliding direction of the two friction plates.

[0085] The motor shaft 113 is generally cylindrical, and the longitudinal direction of the motor shaft 113 can be understood as the radial direction of the motor shaft 113. The radial direction of the motor shaft 113 can also be understood as a planar direction perpendicular to the axial direction of the motor shaft 113. Therefore, the arrangement direction of the housing 114 of the brake motor 110 and the caliper body 103, the sliding direction of the caliper body 103 relative to the caliper frame 104, the arrangement direction of the first friction plate 101 and the second friction plate 102, and the arrangement direction of the two guide rods 105 can all be understood as being along a planar direction perpendicular to the axial direction of the motor shaft 113.

[0086] In one embodiment, the alignment directions of the housing 114 of the brake motor 110 and the caliper body 103, the sliding direction of the caliper body 103 relative to the caliper frame 104, and the alignment directions of the first friction plate 101 and the second friction plate 102 are parallel to each other, while the alignment directions of the two guide rods 105 intersect with the first friction plate 101 and the second friction plate 102 (i.e., the alignment directions of the housing 114 of the brake motor 110 and the caliper body 103, and the sliding direction of the caliper body 103 relative to the caliper frame 104). The two pairs of cooperating guide rods 105 and guide holes 106 can be arranged along the width direction of the first friction plate 101 and the second friction plate 102 to ensure smoother sliding of the caliper body 103 relative to the caliper frame 104.

[0087] By arranging the brake motor 110 between the two guide rods 105, it can be ensured that when the caliper body 103 is driven by the brake motor 110, its force-bearing position is located between the two pairs of mutually cooperating guide rods 105 and guide holes 106 along the longitudinal direction of the motor shaft 113. The sliding of the caliper body 103 relative to the caliper frame 104 is smoother, which can improve the reliability of the electronic mechanical brake system 100.

[0088] It is understandable that the figure only illustrates a structure in which two pairs of mutually cooperating guide rods 105 and guide holes 106 are arranged longitudinally along the motor shaft 113. In other embodiments, a structure in which three or more pairs of mutually cooperating guide rods 105 and guide holes 106 are arranged longitudinally along the motor shaft 113 on both sides of the brake motor 110 can be provided, which can further ensure the stability of the caliper body 103 and the caliper frame 104 during the sliding process.

[0089] At least two guide rods 105 can be arranged along the width of the friction plate, and the arrangement direction of the at least two guide rods 105 also extends along the longitudinal direction of the motor shaft 113. That is, the axial direction of the motor shaft 113 intersects the arrangement direction of the at least two guide rods 105 and the arrangement direction of the two friction plates. This arrangement can also shorten the size of the electronic mechanical brake system 100 along the width of the friction plate (i.e., the arrangement direction of the at least two guide rods 105), which facilitates the layout of the vehicle suspension.

[0090] In one embodiment, two of the at least two guide rods 105 are arranged along an axial direction perpendicular to the motor shaft 113. In this case, the axial dimension of the brake motor 110 does not affect the dimensions of the two guide rods 105 in the arrangement direction. The overall dimensions of the electronic mechanical brake system 100 along the width of the friction plate are relatively small, and the arrangement space of the vehicle suspension is relatively increased.

[0091] On the other hand, in conjunction with an embodiment in which the axial direction of the motor shaft 113 is perpendicular to the extension direction of the guide rods 105 (i.e., the arrangement direction of the two friction plates), the above embodiment can form an arrangement in which the axial direction of the motor shaft 113, the arrangement direction of the two guide rods 105, and the arrangement direction of the two friction plates are perpendicular to each other. In other words, the axial direction of the motor shaft 113 is perpendicular to the arrangement direction of the two friction plates and also perpendicular to the width direction of the friction plates. The axial direction of the motor shaft 113 extends toward the center of the brake disc 201.

[0092] In other words, in the above embodiment, the arrangement direction of the two guide rods 105 is perpendicular to the axial direction of the motor shaft 113 , and the extension direction of the two guide rods 105 is perpendicular to the axial direction of the motor shaft 113 .

[0093] This arrangement positions the motor shaft 113 of the brake motor 110 longitudinally relative to the arrangement direction of the two friction plates and the width direction of the friction plates. The motor shaft 113 of the brake motor 110 extends toward the center of the brake disc 201. The electronic mechanical brake system 100 is relatively small along the arrangement direction of the first friction plate 101 and the second friction plate 102 (i.e., the arrangement direction of the housing 114 of the brake motor 110 and the caliper body 103, and the sliding direction of the caliper body 103 relative to the caliper frame 104). The electronic mechanical brake system 100 is also relatively small along the width direction of the friction plates. The extension of the motor shaft 113 toward the center of the brake disc 201 can save a relatively large amount of wheel side space for arranging components such as the vehicle's suspension, improve the compactness of the vehicle's internal structure, and facilitate vehicle miniaturization.

[0094] In one embodiment, the number of at least two guide rods 105 is an even number, and the number of guide holes 106 on the corresponding caliper body 103 is also an equal even number. The even number of guide rods 105 is symmetrically arranged along the axis of the motor shaft 113. That is, the even number of guide rods 105 is symmetrically arranged on both sides of the brake motor 110 along the width direction of the friction plate. When the brake motor 110 drives the caliper body 103 and the two friction plates through the reducer 120 and the transmission mechanism 130, the guide rods 105 symmetrically arranged on both sides of the brake motor 110 can ensure that the force on the caliper body 103 is balanced, and the caliper body 103 slides more smoothly relative to the caliper frame 104, thereby improving the reliability of the electronic mechanical brake system 100.

[0095] It should be noted that in the above-mentioned figures, the guide rod 105 is fixed to the caliper frame 104 along the longitudinal direction of the motor shaft 113, and the guide hole 106 in the caliper body 103 is coaxially sleeved with the guide rod 105. In other embodiments, the guide rod 105 can also be fixed to the caliper body 103 along the longitudinal direction of the motor shaft 113, and the corresponding guide hole 106 is provided on the caliper frame 104. The guide hole 106 on the caliper frame 104 is coaxially sleeved with the guide rod 105 on the caliper body 103, thereby similarly achieving a sliding connection between the caliper body 103 and the caliper frame 104. That is, one of the caliper frame 104 or the caliper body 103 includes a guide hole 106, each guide hole 106 opening along the longitudinal direction of the motor shaft 113, and each guide hole 106 is used to accommodate one end of a guide rod 105; the other caliper frame 104 or the caliper body 103 is used to fixedly connect the other end of the guide rod 105.

[0096] In some embodiments, the caliper body 103 includes a guide rod 105 and a guide hole 106, and the corresponding caliper frame 104 also includes a guide hole 106 and a guide rod 105. The guide rods 105 and guide holes 106 are coaxially arranged in a one-to-one correspondence, which can also achieve a sliding connection effect between the caliper body 103 and the caliper frame 104. The specific fixed positions of the guide rods 105 and guide holes 106 are not particularly limited in the present embodiment.

[0097] The internal mechanism of the electronic mechanical brake system 100 of the present application is achieved through the reducer 120 and the transmission mechanism 130. The reducer 120 is used to transmit and connect the brake motor 110 and the transmission mechanism 130. The brake motor 110 drives the transmission mechanism 130 through the reducer 120 to move within the electronic mechanical brake system 100, thereby driving the caliper 103 and the two friction pad brake discs 201.

[0098] Specifically, the reducer 120 is a coaxial reducer. The reducer 120 includes a planetary gear set 121, which is used to coaxially transmit the motor shaft 113. The housing 124 of the reducer 120 is fixed to the housing 114 of the brake motor 110 along the axial direction of the motor shaft 113. The housing 124 of the reducer 120 is located on the side close to the center of the brake disc 201 along the axial direction of the motor shaft 113, and the corresponding planetary gear set 121 of the reducer 120 is located on the side close to the center of the brake disc 201 of the stator 111 of the brake motor 110 along the axial direction of the motor shaft 113. That is, the motor shaft 113 of the brake motor 110 extends toward the center of the brake disc 201, and the motor shaft 113 drives the caliper 103 and drives the friction plate through the planetary gear set 121.

[0099] Along the axial direction of the motor shaft 113 of the brake motor 110, the reducer 120 is located on the side of the brake motor 110 close to the center of the brake disc 201. This can reduce the height of the brake motor 110 toward the side away from the center of the brake disc 201, so that the brake motor 110, the caliper body 103, and the caliper frame 104 are all located near the edge of the brake disc 201 (i.e., away from the center). Because the width of the caliper body 103, the caliper frame 104, and the friction plate are relatively large, this arrangement facilitates the overall placement of the electronic mechanical brake system 100. The relatively few components at the center of the brake disc 201 facilitate the arrangement of the reducer 120 and save wheel end space.

[0100] Referring to Figure 6 , the end of motor shaft 113 is provided with a gear structure, which can be understood as the input gear 1211 of planetary gear set 121 of reducer 120. Planetary gear set 121 of reducer 120 also includes planetary gears 1212, a planet carrier 1213, a sun gear 1214, and a ring gear 1215. Sun gear 1214 also includes an output gear 1214a. Output gear 1214a is used to output the power transmitted by planetary gear set 121.

[0101] The input gear 1211 of the planetary gear set 121 is coaxially driven with the motor shaft 113. Planetary gears 1212 mesh with the input gear 1211, driving the planetary gears 1212 to orbit around the axis of the motor shaft 113 and simultaneously rotate the planetary carrier 1213. The planetary carrier 1213 is coaxially fixed to the sun gear 1214 and drives the sun gear 1214 to rotate synchronously around the axis of the motor shaft 113. The ring gear 1215 is fixed to the inner wall of the housing 124 of the reducer 120 and coaxially surrounds the planetary gears 1212, ensuring that each planetary gear 1212 smoothly orbits and rotates within the housing 124 of the reducer 120.

[0102] When the planetary gear system in planetary gear set 121 is multi-stage, the sun gear 1214 at the end of the transmission power flow forms the output gear 1214a of planetary gear set 121. Motor shaft 113 sequentially transmits power to output gear 1214a through the cooperation of input gear 1211, planetary gears 1212, planet carrier 1213, and sun gear 1214, thereby driving transmission mechanism 130 to drive caliper body 103 and friction plate.

[0103] In some embodiments, the reducer 120 may also be provided with a separate output wheel structure. This separate output wheel structure is coaxially driven with the sun gear 1214 of the planetary gear set 121. The output wheel structure is used to be connected to the motor shaft 113 of the brake motor 110 through the planetary gear set 121. The reducer 120 drives the transmission mechanism 130 through the output wheel structure.

[0104] The reducer 120 is implemented in the form of a coaxial reducer, which has a relatively small structure and a relatively high transmission ratio, and can compress the overall volume of the electronic mechanical braking system 100 of the present application.

[0105] In one embodiment, along the axial direction of the motor shaft 113, the output gear 1214a is located on the side of the planetary gear set 121 that is close to the stator 111 of the brake motor 110. At least the output gear 1214a and the planet carrier 1213 are provided with inner holes. The motor shaft 113 is configured to pass through the inner hole of the output gear 1214a to achieve a transmission connection with the planetary gear set 121. Specifically, the motor shaft 113 passes through the inner hole of the output gear 1214a and the planet carrier 1213 to achieve a transmission connection with the input gear 1211 of the planetary gear set 121.

[0106] Or it can be described as follows: the distance between the axial output wheel 1214a of the brake motor 110 and the stator 111 of the brake motor 110 is smaller than the distance between the planetary gear set 121 and the stator 111 of the brake motor 110, and the motor shaft 113 of the brake motor 110 is used to pass through the inner hole of the output wheel 1214a to transmit and connect to the planetary gear set 121.

[0107] For details, please refer to Figure 7. The planetary gear set 121 of the reducer 120 is coaxially arranged with the stator 111 of the brake motor 110 along the axial direction of the motor shaft 113. The output gear 1214a of the planetary gear set 121 is arranged toward the stator 111 close to the brake motor 110. Along the axial direction of the motor shaft 113, the stator 111 of the brake motor 110, the output gear 1214a, and the input gear 1211 of the planetary gear set 121 are arranged in sequence. The motor shaft 113 passes through the output gear 1214a along its own axial direction and is transmission-connected to the input gear 1211 of the planetary gear set 121. The input gear 1211 is driven to rotate by the motor shaft 113, and the internal action of the planetary gear set 121 drives the output gear 1214a to rotate coaxially with the motor shaft 113 on the side close to the stator 111 of the brake motor 110.

[0108] Positioning output gear 1214a on the side of planetary gear set 121 near stator 111 of brake motor 110 allows planetary gear set 121 as a whole to be closer to the center of brake disc 201, while positioning output gear 1214a relatively further away from the center of brake disc 201. Along the axial direction of motor shaft 113, the output structure of reducer 120 is relatively close to caliper body 103 and friction plate, facilitating transmission connection and relative arrangement between reducer 120 and transmission mechanism 130.

[0109] On the other hand, setting the overall structure of the reducer 120 closer to the center of the brake disc 201 can reduce the axial distance between the brake motor 110 and the brake disc 201 along the motor shaft 113, avoiding the brake motor 110 from being raised radially along the brake disc 201, which affects the arrangement of the vehicle's suspension in the wheel end space.

[0110] In one embodiment, the transmission mechanism 130 includes an eccentric 131 and a swing arm 133. In some embodiments, the transmission mechanism 130 further includes a slider 132. The swing arm 133 is used for transmission connection between the reducer 120 and the eccentric 131. The brake motor 110 drives the swing arm 133 to swing clockwise or counterclockwise through the reducer 120. The swing arm 133 drives the eccentric 131 to rotate clockwise or counterclockwise. The eccentric 131 is used for transmission connection to the friction plate.

[0111] In one embodiment, the eccentric wheel 131 and the slider 132 can be accommodated in a receiving groove of the caliper body 103, the slider 132 is slidably connected to the caliper body 103, and the eccentric wheel 131 is rotatably connected to the caliper body 103. The rotation axis of the eccentric wheel 131 is parallel to the axial direction of the motor shaft 113. The slider 132 is arranged between the eccentric wheel 131 and the first friction plate 101 along the longitudinal direction of the motor shaft 113. The eccentric wheel 131 rotates relative to the caliper body 103 to push the slider 132 and the first friction plate 101 to slide along the longitudinal direction of the motor shaft 113 toward the brake disc 201.

[0112] For details, please refer to Figures 8 and 9. The eccentric wheel 131 includes an eccentric portion 1311. The eccentric portion 1311 is arranged along the circumference of the eccentric wheel 131, and the outer diameter of the eccentric portion 1311 is larger than the outer diameter of the main body of the eccentric wheel 131. Part of the swing arm 133 is located in the receiving groove of the caliper body 103, and the other part is located inside the reducer 120. The swing arm 133 is transmission-connected between the reducer 120 and the eccentric wheel 131. When the reducer 120 drives the eccentric wheel 131 to rotate along the axial direction parallel to the motor shaft 113 through the swing arm 133, the eccentric portion 1311 of the eccentric wheel 131 rotates toward the slider 132. Because the eccentric wheel 131, the slider 132, and the first friction plate 101 are arranged in abutting contact along the longitudinal direction of the motor shaft 113, the eccentric portion 1311 pushes the slider 132 along the longitudinal direction of the motor shaft 113, driving the first friction plate 101 to slide along the longitudinal direction of the motor shaft 113 toward the brake disc 201. This allows the first friction plate 101 to contact the end surface of the brake disc 201.

[0113] In one embodiment, the slider 132 may be fixedly connected to the first friction plate 101 along the longitudinal direction of the motor shaft 113. The slider 132 is used to drive the first friction plate 101 to slide synchronously with respect to the caliper body 103.

[0114] In one embodiment, a sliding member 1312 may be further provided at the eccentric portion 1311 of the eccentric wheel 131. The sliding member 1312 is connected between the eccentric portion 1311 and the slider 132 along the longitudinal direction of the motor shaft 113. The eccentric portion 1311 of the eccentric wheel 131 drives the sliding member 1312 to slide toward the slider 132, thereby driving the first friction plate 101. The sliding member 1312 can increase the contact area between the eccentric wheel 131 and the slider 132, thereby allowing the eccentric portion 1311 of the eccentric wheel 131 to push the slider 132 more smoothly.

[0115] As shown in Figures 8 and 9, the slider 132 may further include a limit frame 1321. The limit frame 1321 surrounds the eccentric portion 1311 of the eccentric wheel 131 along a plane perpendicular to the motor shaft 113. The limit frame 1321 is used to limit the position of the eccentric wheel 131 and ensure the relative distance between the eccentric wheel 131 and the slider 132. The slider 1312 may also be accommodated within the limit frame 1321. The limit frame 1321 is also used to limit the sliding range of the slider 1312 to ensure that the slider 1312 reliably abuts and connects the eccentric wheel 131 and the slider 132.

[0116] It should be noted that during operation of the electromechanical brake system 100, the long-term internal mechanical operation of the transmission mechanism 130 may cause wear. Based on the amount of wear on the transmission mechanism 130, the user can replace the sliding member 1312 (along the longitudinal direction of the motor shaft 113) with a matching size to compensate for the wear of the transmission mechanism 130. The smaller size of the sliding member 1312 in the above embodiment can reduce the maintenance cost of the electromechanical brake system 100.

[0117] In one embodiment, along the arrangement direction of at least two guide rods 105, the rotation axis of the eccentric wheel 131 coincides with the midpoint of the two guide rods 105; in another embodiment, along the width direction of the first friction plate 101, the rotation axis of the eccentric wheel 131 coincides with the midpoint of the first friction plate 101; in another embodiment, along the width direction of the slider 132, the rotation axis of the eccentric wheel 131 coincides with the midpoint of the slider 132. Each of the above embodiments can ensure that the force point of the eccentric portion 1311 acting on the first friction plate 101 is relatively centered during the rotation of the eccentric wheel 131, and the force applied to the caliper body 103, the slider 132, or the first friction plate 101 is more balanced, ensuring smooth sliding of the caliper body 103, the slider 132, or the first friction plate 101 along the longitudinal direction of the motor shaft 113. It is understandable that the above embodiments may be combined in pairs or in combination to further ensure the internal force balance of the electronic mechanical braking system 100 and improve the reliability of the electronic mechanical braking system 100 .

[0118] As mentioned above, the swing arm 133 is transmission-connected between the reducer 120 and the eccentric wheel 131. Specifically, the swing arm 133 is arranged along the longitudinal direction of the motor shaft 113. The swing arm 133 includes two opposite ends along its own length direction. One end of the swing arm 133 along the longitudinal direction of the motor shaft 113 is fixedly connected to the eccentric wheel 131, and the other end of the swing arm 133 along the longitudinal direction of the motor shaft 113 is engaged with the output wheel 1214a of the reducer 120. The brake motor 110 is used to drive the swing arm 133 to rotate around the rotation axis of the eccentric wheel 131 through the output wheel 1214a, so as to drive the eccentric wheel 131 to rotate coaxially relative to the end of the swing arm 133.

[0119] For the electronic mechanical brake system 100 of the present application, because the rotation axis of the eccentric wheel 131 is parallel and spaced from the output wheel 1214a along the longitudinal direction of the motor shaft 113, by arranging the swing arm 133 along the longitudinal direction of the motor shaft 113, the swing arm 133 can transmit the rotational motion of the output wheel 1214a to the eccentric wheel 131, and drive the eccentric wheel 131 to rotate synchronously with the output wheel 1214a.

[0120] Among them, along the direction of the rotation axis of the eccentric wheel 131, the end of the swing arm 133 is arranged adjacent to the eccentric wheel 131 and fixedly connected. Along the axial direction of the motor shaft 113, the other end of the swing arm 133 is arranged flush with the output wheel 1214a. In this way, the swing arm 133 can be arranged as a whole perpendicular to the axial direction of the motor shaft 113, and the length dimensions of the opposite ends of the swing arm 133 roughly match the rotation axis of the eccentric wheel 131 and the outer diameter of the output wheel 1214a. The longitudinal dimension of the swing arm 133 along the motor shaft 113 is relatively small, and the space occupied by the swing arm 133 along the axial direction of the motor shaft 113 is also relatively small, which is conducive to the miniaturization of the swing arm 133 and compresses the overall volume of the electronic mechanical brake system 100.

[0121] In another embodiment, the transmission mechanism 130 can also adopt a screw drive. For details, please refer to Figure 10. The transmission mechanism 130 may include a screw 134 and a screw sleeve 135. The screw 134 and the screw sleeve 135 are accommodated in the receiving groove of the caliper body 103. The rotation axis of the screw 134 is arranged along the longitudinal direction of the motor shaft 113, and the screw sleeve 135 is coaxially sleeved on the outer side of the screw 134. The screw 134 is used for transmission connection with the reducer 120. The reducer 120 drives the screw 134 to rotate to drive the screw sleeve 135 to slide along the longitudinal direction of the motor shaft 113 to drive the first friction plate 101.

[0122] Specifically, the outer circumference of the lead screw 134 and the inner circumference of the screw sleeve 135 are provided with mating threads. When the lead screw 134 is driven by the reducer 120 to rotate along its own axis, the lead screw 134 drives the screw sleeve 135 to slide along the rotation axis of the lead screw 134. On the side of the screw sleeve 135 away from the reducer 120, the screw sleeve 135, the first friction plate 101, and the brake disc 201 are arranged in sequence along the axis of the lead screw 134. By driving the screw sleeve 135 to slide along the axis of the lead screw 134, the lead screw 134 can drive the first friction plate 101 to move relative to the brake disc 201.

[0123] It can be understood that when the brake motor 110 rotates forward, the reducer 120 drives the screw 134 to rotate forward along its own axis, and the screw sleeve 135 slides along the longitudinal direction of the motor shaft 113 toward the brake disc 201, and drives the first friction plate 101 to contact the brake disc 201 to achieve braking; when the brake motor 110 reverses, the reducer 120 drives the screw 134 to reverse along its own axis, and the screw sleeve 135 slides along the longitudinal direction of the motor shaft 113 toward the direction away from the brake disc 201, driving the first friction plate 101 and the brake disc 201 to release.

[0124] In some embodiments, as shown in Figure 10, a separation spring 107 is further provided between the first friction plate 101 and the second friction plate 102, and the opposite ends of the separation spring 107 respectively abut against the first friction plate 101 and the second friction plate 102. The separation spring 107 is used to provide an elastic force for the first friction plate 101 and the second friction plate 102 to move away from each other along the longitudinal direction of the motor shaft 113, so as to ensure that after the screw sleeve 135 slides away from the brake disc 201, the friction plates respectively release contact with the brake disc 201.

[0125] In some embodiments, balls (not shown) may be disposed between the lead screw 134 and the screw sleeve 135. Multiple balls may be provided, and the balls are positioned between the outer threads of the lead screw 134 and the inner threads of the screw sleeve 135. The balls are used to reduce friction between the lead screw 134 and the screw sleeve 135, thereby improving the transmission efficiency of the electronic mechanical brake system 100.

[0126] In one embodiment, the transmission mechanism 130 further includes a reversing wheel set (not shown). The reversing wheel set is used to transmit and connect the output wheel 1214a of the reducer 120 and the lead screw 134. The reversing wheel set is used to change the internal rotation axis of the transmission mechanism 130, so as to reverse the coaxial rotation of the output wheel 1214a of the reducer 120 relative to the motor shaft 113 to the rotation of the lead screw 134 along the direction of the motor shaft 113. Exemplarily, the reversing wheel set can be implemented by two bevel gears meshing with each other. One of the bevel gears is parallel or coaxially driven with the output wheel 1214a, and the other bevel gear is coaxially driven with the lead screw 134 to achieve the effect of changing the internal rotation axis of the transmission mechanism 130.

[0127] Please continue to refer to Figure 10 and refer to Figure 5 in conjunction. For the electronic mechanical brake system 100 of the present application, the caliper body 103 is roughly U-shaped. The caliper body 103 includes a main body 1031, a pushing part 1032 and a connecting part 1033. The main body 1031 and the pushing part 1032 are arranged on both sides of the two friction plates along the longitudinal direction of the motor shaft 113. The main body 1031, the first friction plate 101, the brake disc 201, the second friction plate 102, and the pushing part 1032 are arranged in sequence along the longitudinal direction of the motor shaft 113. That is, the two friction plates are arranged between the main body 1031 and the pushing part 1032 along the longitudinal direction of the motor shaft 113. The connecting part 1033 is located on the outside of the brake disc 201 along the radial direction of the brake disc 201, and the connecting part 1033 is used to fix the main body 1031 and the pushing part 1032.

[0128] The main body 1031 is used for sliding connection to the caliper frame 104. The longitudinal main body 1031 along the motor shaft 113 is used for sliding connection to the first friction plate 101 and for partially accommodating the transmission mechanism 130. Specifically, the accommodating groove of the caliper body 103 is provided on the main body 1031, and the opening of the accommodating groove faces the longitudinal direction along the motor shaft 113. The main body 1031 is used to accommodate and transmission-connect the transmission mechanism 130 of the electronic mechanical brake system 100. The longitudinal pushing portion 1032 along the motor shaft 113 is used for fixed connection to the second friction plate 102. The transmission mechanism 130 is used to drive the first friction plate 101 to slide longitudinally along the motor shaft 113 in the caliper body 103. The transmission mechanism 130 is also used to drive the second friction plate 102 to slide longitudinally along the motor shaft 113 through the caliper body 103.

[0129] In this implementation, the brake motor 110 is fixed to the main body 1031 along the longitudinal direction of the motor shaft 113. The brake motor 110 is used to drive the first friction plate 101 through the reducer 120 and the transmission mechanism 130, and drive the second friction plate 102 through the pushing part 1032 of the caliper body 103, so that the two friction plates slide relative to each other along the longitudinal direction of the motor shaft 113 to brake the brake disc 201.

[0130] The braking process of the electronic mechanical braking system 100 of the present application is described below with reference to FIG5 :

[0131] When the user presses the vehicle's brake pedal, the electromechanical brake system 100 receives a brake signal, and the stator 111 of the brake motor 110 drives the rotor to rotate, driving the motor shaft 113 to rotate along the axis of the brake motor 110. The motor shaft 113 drives the planetary gear set 121 of the reducer 120 to rotate. The output wheel 1214a of the planetary gear set 121 is configured to rotate axially along the brake motor 110 to output power. The output wheel 1214a rotates and drives the meshing swing arm 133 to rotate about the rotation axis of the eccentric wheel 131. The swing arm 133 drives the fixedly connected eccentric wheel 131 to rotate about its own axis, where the rotation axis of the eccentric wheel 131 is parallel to the axial direction of the motor shaft 113.

[0132] The eccentric portion 1311 of the eccentric wheel 131 rotates synchronously with the swing arm 133. The eccentric portion 1311 pushes the slider 132 along the longitudinal direction of the motor shaft 113, causing it to slide along the longitudinal direction of the motor shaft 113. The slider 132 pushes the first friction plate 101 along the longitudinal direction of the motor shaft 113, pushing it relative to the caliper body 103. After the first friction plate 101 approaches and contacts the end surface of the brake disc 201, the brake motor 110 continues to drive the motor shaft 113 to rotate. The thrust of the motor shaft 113 driving the first friction plate 101 toward the brake disc 201 is converted into a counterthrust force from the brake disc 201 against the first friction plate 101.

[0133] Under the action of the reverse thrust, the caliper body 103 slides relative to the caliper frame 104 along the longitudinal direction of the motor shaft 113, with the sliding direction of the caliper body 103 being toward the brake motor 110. The caliper body 103 is able to drive the second friction plate 102 to slide along the longitudinal direction of the motor shaft 113 toward the brake disc 201. That is, the brake motor 110 drives the caliper body 103 through the reducer 120 and the transmission mechanism 130, driving the second friction plate 102, and causing the first friction plate 101 and the second friction plate 102 to slide toward each other. The second friction plate 102 contacts the brake disc 201 from the other end face of the brake disc 201. The first friction plate 101 and the second friction plate 102 slide relative to each other from both sides to clamp the brake disc 201 and achieve braking.

[0134] In one embodiment, the electronic mechanical brake system 100 of the present application includes a circuit board 108. Circuit board 108 carries a drive circuit, which in turn drives a brake motor 110. For details, please refer to Figure 5 . Circuit board 108 can be housed within a housing 114 of brake motor 110, shortening the signal transmission distance from the drive circuit to brake motor 110 and simplifying the internal wiring layout of the electronic mechanical brake system 100. Housing 114 also provides a reliable seal and protective protection for circuit board 108.

[0135] The circuit board 108 is plate-shaped, with its thickness parallel to the axial direction of the motor shaft 113. The electronic mechanical brake system 100 of the present application utilizes the integrated circuit board 108 within the housing 114 of the brake motor 110 to drive the brake motor 110. The thickness of the circuit board 108, parallel to the axial direction of the motor shaft 113, shortens the axial dimension of the electronic mechanical brake system 100 along the motor shaft 113, facilitating its layout.

[0136] In one embodiment, the circuit board 108 is arranged on the side of the stator 111 of the brake motor 110 that is away from the planetary gear set 121 of the reducer 120 along the axial direction of the motor shaft 113. That is, the circuit board 108 and the planetary gear set 121 are arranged on either side of the stator 111 of the brake motor 110 along the axial direction of the motor shaft 113. The circuit board 108 can be arranged close to the stator 111 and rotor of the brake motor 110, shortening the signal transmission path between the circuit board 108 and the brake motor 110 and improving reliability. Furthermore, the circuit board 108 can be arranged away from the motor shaft 113, eliminating the need to provide a through hole in the circuit board 108 for the motor shaft 113 to pass through.

[0137] On the other hand, the brake motor 110 and the reducer 120 may contain oil, which is used for lubrication and heat dissipation to ensure reliable operation of the electromechanical brake system 100. Placing the circuit board 108 axially along the motor shaft 113 on one side of the stator 111, rotor, and reducer 120 of the brake motor 110 can reduce oil contamination of the circuit board 108 and protect the drive circuitry mounted on the circuit board 108.

[0138] In some embodiments, when the electromechanical brake system 100 is mounted on a vehicle, the circuit board 108 can be positioned vertically above the stator 111 of the brake motor 110 and the planetary gear set 121 of the reducer 120. Specifically, the motor shaft 113 is positioned vertically or at an angle to the vertical. This allows the oil in the brake motor 110 and reducer 120 to flow downward under gravity, further reducing oil contamination of the circuit board 108.

[0139] In one embodiment, the housing 114 of the brake motor 110 may further include a partition 115. The partition 115 is disposed between the circuit board 108 and the stator 111 of the brake motor 110. Specifically, along the axial direction of the motor shaft 113, the circuit board 108, the partition 115, the stator 111 of the brake motor 110, and the planetary gear set 121 of the reducer 120 are arranged in sequence. The partition 115 is used to seal and protect the circuit board 108, preventing oil in the brake motor 110 or reducer 120 from contaminating the circuit board 108.

[0140] In one embodiment, the thickness direction of the partition 115 is also arranged along the axial direction of the motor shaft 113 . The partition 115 and the circuit board 108 are parallel to each other, which can compress the axial dimension of the brake motor 110 .

[0141] In one embodiment, the circuit board 108 has a rectangular planar shape. The length of the circuit board 108 extends longitudinally along the motor shaft 113 and intersects the sliding direction of the first friction plate 101 and the second friction plate 102. Specifically, the long side of the rectangular circuit board 108 is arranged parallel to the arrangement direction of the two guide rods 105, while the short side of the rectangular circuit board 108 is arranged parallel to the sliding direction of the first friction plate 101 and the second friction plate 102. This arrangement can shorten the length of the electronic mechanical brake system 100 along the sliding direction of the first friction plate 101 and the second friction plate 102, thereby saving space near the wheel.

[0142] In one embodiment, the electromechanical brake system 100 includes a position sensor 140 . The position sensor 140 is used to detect the rotation angle of the brake motor 110 , thereby adjusting the braking force of the electromechanical brake system 100 .

[0143] For details, please refer to Figure 11. The position sensor 140 includes a stator 141 and a rotor 142. The stator 141 of the position sensor 140 can be fixed to the circuit board 108, and the rotor 142 of the position sensor 140 can be coaxially driven with the motor shaft 113 of the brake motor 110. In one embodiment, the motor shaft 113 passes through the rotor of the brake motor 110 along its own axial direction and extends toward the circuit board 108 to fix the rotor 142 of the position sensor 140. The rotor 142 of the position sensor 140 can be coaxially driven with the motor shaft 113 of the brake motor 110.

[0144] The electromechanical brake system 100 detects the rotational angle of the motor shaft 113 and rotor of the brake motor 110 relative to the stator 111 through the coordination of the stator 141 and rotor 142 of the position sensor 140. The position sensor 140 is also in communication with the drive circuit on the circuit board 108. The drive circuit receives the angle signal detected by the position sensor 140, calculates the rotational angle of the rotor in the brake motor 110, and thereby adjusts the braking force of the electromechanical brake system 100, thereby adjusting the braking force applied to the vehicle.

[0145] Based on the different operating principles of the position sensor 140, the stator 141 and rotor 142 of the position sensor 140 may be aligned in the axial direction of the motor shaft 113 of the brake motor 110 or in the radial direction of the motor shaft 113 of the brake motor 110. When the stator 141 and rotor 142 of the position sensor 140 are aligned in the axial direction of the motor shaft 113, the rotor 142 of the position sensor 140 may be fixed to the end of the motor shaft 113 of the brake motor 110 that faces the circuit board 108, with a gap between the stator 141 and rotor 142 of the position sensor 140 along the axial direction of the motor shaft 113.

[0146] When the stator 141 and rotor 142 of the position sensor 140 are aligned radially with respect to the brake motor 110, as shown in FIG12 , the stator 141 of the position sensor 140 has an inner hole, the axis of which coincides with the axis of the brake motor 110. The motor shaft 113 of the brake motor 110 extends toward the circuit board 108. The end of the motor shaft 113 passes through the circuit board 108, and the rotor 142 of the position sensor 140 is fixed to the outer circumference of the motor shaft 113. The inner hole of the stator 141 of the position sensor 140 is used to at least partially accommodate the rotor 142 of the position sensor 140. In this case, a gap is left between the stator 141 and the rotor 142 of the position sensor 140 along the radial direction of the brake motor 110.

[0147] Obviously, those skilled in the art may make various modifications and variations to this application without departing from the scope of protection of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. An electromechanical braking system with a longitudinally arranged motor shaft, characterized in that, The electromechanical brake system comprises a brake motor, a reducer, a transmission mechanism, a caliper body and a caliper frame, wherein: The caliper body is slidably connected to the caliper frame via a guide rod and is used to drive the friction pad to brake the brake disc; The motor shaft of the brake motor is longitudinally arranged relative to the guide rod and drives the caliper body to slide along the guide rod relative to the caliper frame through the reducer and the transmission mechanism.

2. The electromechanical braking system according to claim 1, wherein, The electronic mechanical brake system comprises two guide rods, which are spaced relatively and arranged in parallel, the spacing between the two guide rods is greater than the outer diameter of the brake motor, and the caliper body is slidably connected to the caliper frame through the two guide rods.

3. The electromechanical braking system according to claim 2, characterized in that, The arrangement direction of the two guide rods is perpendicular to the axial direction of the motor shaft, and the extension direction of the two guide rods is perpendicular to the axial direction of the motor shaft.

4. The electromechanical braking system according to any one of claims 1-3, characterized in that, One of the caliper frame or the caliper body comprises a guide hole, the opening of each guide hole is oriented in the longitudinal direction of the motor shaft, and each guide hole is used to accommodate one end of one guide rod; The other of the caliper frame or the caliper body is used for fixedly connecting the other end of the guide rod.

5. The electromechanical braking system according to any one of claims 1-4, characterized in that, The housing of the reducer is used to be fixed to the housing of the brake motor along the axial direction of the motor shaft. Along the axial direction of the brake motor, the reducer is located on the side of the brake motor close to the center of the brake disc.

6. The electromechanical braking system according to claim 5, characterized in that, The reducer includes an output wheel and a planetary gear set, the output wheel is used to be connected to the motor shaft of the brake motor through the planetary gear set, the output wheel is used to drive the transmission mechanism, the distance between the output wheel and the stator of the brake motor along the axial direction of the brake motor is smaller than the distance between the planetary gear set and the stator of the brake motor, and the motor shaft of the brake motor is used to pass through the inner hole of the output wheel to be connected to the planetary gear set.

7. The electromechanical braking system according to any one of claims 1-6, characterized in that, The transmission mechanism comprises a swing arm and an eccentric wheel, wherein: The swing arm is used for transmission connection between the reducer and the eccentric wheel. The brake motor drives the swing arm to swing in a clockwise or counterclockwise direction through the reducer. The swing arm drives the eccentric wheel to rotate in a clockwise or counterclockwise direction. The eccentric wheel is used for transmission connection with the friction plate.

8. The electromechanical braking system according to any one of claims 1-7, characterized in that, The electromechanical brake system comprises a circuit board, the circuit board is used to carry a drive circuit, the drive circuit is used to drive the brake motor, wherein: The thickness direction of the circuit board is parallel to the axial direction of the motor shaft.

9. The electromechanical braking system according to claim 8, characterized in that, The circuit board and the reducer are respectively arranged on two sides of the stator of the brake motor along the axial direction of the motor shaft.

10. The electromechanical braking system according to claim 9 or 10, characterized in that, The housing of the brake motor comprises a partition plate, and the circuit board, the partition plate and the stator of the brake motor are arranged in sequence along the axial direction of the motor shaft.

11. The electromechanical braking system according to any one of claims 8-10, characterized in that, The electromechanical brake system comprises a position sensor, the position sensor is used to detect the rotation angle of the brake motor, the position sensor comprises a stator and a rotor, wherein: The circuit board is used to fix the stator of the position sensor; The motor shaft is used for coaxially driving the rotor of the position sensor.

12. The electromechanical braking system according to any one of claims 1-11, characterized in that, The electro-mechanical braking system includes two of the friction plates. Along the longitudinal direction of the motor shaft, the two friction plates are arranged on both sides of the brake disc, and the transmission mechanism drives the two friction plates to slide relatively along the longitudinal direction of the motor shaft to brake the brake disc.

13. The electromechanical braking system according to claim 12, wherein, The caliper body includes a main body portion, a pushing portion, and a connecting portion. The connecting portion is used for fixedly connecting the main body portion and the pushing portion, where: Along the longitudinal direction of the motor shaft, the two friction plates are arranged between the main body portion and the pushing portion; The main body portion is used for slidably connecting one of the friction plates, and the pushing portion is used for fixedly connecting the other friction plate.

14. The electro-mechanical braking system according to claim 13, wherein the main body portion includes a receiving groove for partially receiving the transmission mechanism, and the opening of the receiving groove faces along the longitudinal direction of the motor shaft.

15. A vehicle, characterized in that, It includes a brake pedal, a wheel, and the electro-mechanical braking system according to any one of claims 1-14. The brake pedal is used to control at least one electro-mechanical braking system to drive the friction plate towards or away from the brake disc of the wheel.

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