Brake actuator assembly, brake system and vehicle

Abstract

A brake actuator assembly (100), a brake system (102), and a vehicle. The brake actuator assembly (100) comprises: an actuator housing (1), wherein an actuating piston (11) and a piston rod (12) are provided inside the actuator housing (1), and a brake fluid passage (13) is formed in the actuator housing (1); and a driving structure, wherein the piston rod (12) is adapted to rotate with the driving structure so as to drive the actuating piston (11) to move axially to press against a brake shoe, and the piston rod (12) is adapted to, under the hydraulic pressure of the brake fluid passage (13), drive the actuating piston (11) to move axially so as to press against the brake shoe.

Description

Brake actuator assembly, brake system and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 202410248341.4, filed on March 5, 2024, entitled “Brake Actuator Assembly, Braking System and Vehicle,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of vehicle manufacturing, and in particular to a brake actuator assembly, a brake system having the brake actuator assembly, and a vehicle having the brake system. Background Art

[0004] At present, electronic brake systems have become a development trend in motor vehicle braking systems, among which rear caliper integrated electronic brake products are relatively mature, but the domestic driving and parking integrated technology for drum brakes is still in the research and development stage. Compared with disc EPB, drum EPB (Electrical Park Brake) has the advantages of light weight, low drag and low cost, which is conducive to improving the cruising range of new energy vehicles, improving vehicle performance and cost performance, and is in line with product development trends. The existing drum brakes use split brakes with only a single function. Braking is achieved by working the brakes with the corresponding function when driving or parking. However, when installing the whole vehicle, the existing technology needs to be arranged in a split manner according to the function, which has a low degree of integration, an increased number of parts, difficulty in maintenance, and increased costs. There is room for improvement.

[0005] Summary of the Invention

[0006] This application aims to address at least one of the technical problems existing in the prior art. To this end, one objective of this application is to provide a brake actuator system. The brake actuator assembly can implement both parking and service braking of a vehicle, meeting user needs, while having a high degree of overall integration, a reduced number of parts, and reduced setup costs and maintenance difficulties.

[0007] According to the brake actuator assembly of the embodiment of the present application, it includes: an actuator housing, in which an actuator piston and a piston rod are provided, the piston rod is rotatably installed in the actuator housing and is movable in the axial direction, the actuator piston is sleeved on the piston rod and is movably connected to the piston rod, and the actuator housing is formed with a brake oil channel; a drive structure, the drive structure is dynamically connected to the piston rod, the piston rod is suitable for rotating with the drive structure to drive the actuator piston to move axially to press against the brake shoe, and the piston rod is suitable for driving the actuator piston to move axially to press against the brake shoe under the action of the oil pressure in the brake oil channel.

[0008] According to the brake actuator assembly of the embodiment of the present application, the piston rod can be rotated or moved axially under the action of the driving structure and the brake fluid, respectively, and then the actuator piston can be driven to move axially to press against the brake shoe, thereby realizing the parking brake and service brake of the vehicle, meeting user needs, and the overall integration is high, the number of parts is small, and the setup cost and maintenance difficulty are reduced.

[0009] According to the brake actuator assembly of the embodiment of the present application, the driving structure includes a power source component and a transmission gear set, the transmission gear set is located in the actuator housing, and the power source component is suitable for driving the piston rod to rotate through the transmission gear set.

[0010] According to the brake actuator assembly of the embodiment of the present application, the transmission gear group includes an input gear, a bridge gear and a slave cylinder gear, and the input gear, the bridge gear and the slave cylinder gear are respectively rotatably installed in the actuator housing; wherein, the input gear is dynamically connected to the power source assembly, and the input gear and the slave cylinder gear are respectively meshed with the bridge gear for transmission, the slave cylinder gear is sleeved on the outside of the piston rod and cooperates with the piston rod for circumferential transmission, and the piston rod is movable axially relative to the slave cylinder gear.

[0011] According to the brake actuator assembly of the embodiment of the present application, an active cavity with open ends is formed in the slave cylinder gear, and there are two actuator pistons and two piston rods. The two actuator pistons are correspondingly mounted on the outside of the two piston rods and form two groups of actuator structures; one end of the two piston rods extends from the two ends of the slave cylinder gear into the active cavity respectively, and the piston rod is provided with an intermediate through hole connected to the active cavity, the actuator piston is mounted on the outside of the piston rod and covered on the outside of the other end of the piston rod, and the brake oil channel is connected between the two groups of actuator structures and is suitable for pushing the two groups of actuator structures to move away from each other.

[0012] According to the brake actuator assembly of the embodiment of the present application, the outer peripheral wall of the piston rod is provided with a shoulder, and the shoulders of the two piston rods are suitable for limiting and pressing against the two end faces of the slave cylinder gear to form a reserved gap between the ends of the two piston rods.

[0013] According to the brake actuator assembly of an embodiment of the present application, the power source component includes a driving member, a planetary gear set and a drive shaft, the output end of the driving member is dynamically connected to the planetary gear set, and the drive shaft is dynamically connected between the planetary gear set and the transmission gear set.

[0014] According to the brake actuator assembly of an embodiment of the present application, the power source component also includes a mounting shell, which is connected to the outside of the actuator shell, and the driving member and the planetary gear set are both installed in the mounting shell, and the drive shaft is rotatably passed through the actuator shell so that one end of the drive shaft extends into the mounting shell and the other end extends into the actuator shell.

[0015] According to the brake actuator assembly of the embodiment of the present application, an accommodating chamber is formed in the actuator housing, the piston rod and the actuator piston are both installed in the accommodating chamber, and one end of the brake oil channel is formed with an oil inlet hole on the outside of the actuator housing and the other end is formed with an oil outlet hole open toward the accommodating chamber.

[0016] The present application also proposes a braking system.

[0017] According to an embodiment of the present application, the braking system includes a brake assembly and a brake actuator assembly described in any one of the above, wherein the brake actuator assembly is connected to the brake assembly, and the brake assembly includes a brake shoe, and the actuator piston is movable relative to the actuator housing to selectively press against the brake shoe.

[0018] The present application also proposes a vehicle.

[0019] The vehicle according to the embodiment of the present application is provided with the braking system described above.

[0020] The advantages of the vehicle, the braking system and the brake actuator assembly described above relative to the prior art are the same and will not be elaborated here.

[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] FIG1 is an exploded schematic diagram of a brake actuator assembly according to an embodiment of the present application;

[0024] FIG2 is a cross-sectional schematic diagram of a brake actuator assembly according to an embodiment of the present application;

[0025] FIG3 is a partial schematic diagram of a brake actuator assembly according to an embodiment of the present application;

[0026] FIG4 is a schematic structural diagram of a piston rod of a brake actuator assembly according to an embodiment of the present application;

[0027] FIG5 is a schematic structural diagram of an actuator piston of a brake actuator assembly according to an embodiment of the present application;

[0028] FIG6 is a second partial schematic diagram of a brake actuator assembly according to an embodiment of the present application;

[0029] 7 is a front view of a wheel cylinder gear of a brake actuator assembly according to an embodiment of the present application;

[0030] FIG8 is a schematic cross-sectional view taken along line AA in FIG7 ;

[0031] FIG9 is a first structural diagram of a braking system according to an embodiment of the present application;

[0032] FIG10 is a second structural diagram of a braking system according to an embodiment of the present application.

[0033] Figure markings: brake actuator assembly 100, brake assembly 101, brake system 102, actuator housing 1, actuator piston 11, piston rod 12, shoulder 121, tooth structure 122, middle through hole 123, reserved gap 124, brake oil channel 13, oil inlet hole 131, oil outlet hole 132, accommodating chamber 14, upper housing 15, lower housing 16, sealing ring 17, bleed screw 18, power source assembly 21, driving member 211, planetary gear set 212, drive shaft 213, mounting housing 214, gasket 215, gasket 216, transmission gear set 22, input gear 221, bridge gear 222, bridge gear shaft 2221, slave cylinder gear 223, groove 2231, active chamber 2232, actuator structure 19. DETAILED DESCRIPTION

[0034] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0035] The following describes a brake actuator assembly 100 according to an embodiment of the present application with reference to Figures 1 to 10. The vehicle's parking brake is achieved by the piston rod 12 pushing the actuator piston 11 against the brake shoe. The vehicle's service brake is achieved by the oil pressure of the brake fluid pushing the piston rod 12 to drive the actuator piston 11 to press against the brake shoe, so as to meet user needs. The overall integration is high, the number of parts is small, and the setup cost and maintenance difficulty are reduced.

[0036] As shown in FIG1 , a brake actuator assembly 100 according to an embodiment of the present application includes an actuator housing 1 and a drive structure.

[0037] An actuator piston 11 and a piston rod 12 are provided in the actuator housing 1. The piston rod 12 is rotatably mounted in the actuator housing 1 and is movable along the axial direction. The actuator piston 11 is sleeved on the piston rod 12 and is movably connected to the piston rod 12. A brake oil channel 13 is formed in the actuator housing 1.

[0038] Specifically, the actuator housing 1 can provide an installation position for the piston rod 12, and the piston rod 12 can rotate or move axially relative to the actuator housing 1. At the same time, the piston rod 12 and the actuator piston 11 are movably connected, such as by threaded cooperation. Specifically, an external thread can be provided on the outer peripheral wall of the piston rod 12, and an internal thread can be provided on the inner peripheral wall of the actuator piston 11. The piston rod 12 and the actuator piston 11 are connected by the cooperation of the external thread and the internal thread. When the piston rod 12 rotates relative to the actuator housing 1, the actuator piston 11 can be driven to move axially. When the piston rod 12 moves axially relative to the actuator housing 1, the actuator piston 11 can be pushed to move axially. In addition, a brake oil channel 13 is also formed in the actuator housing 1. The brake oil channel 13 is used to allow brake fluid to flow inside it.

[0039] It should be noted that, in the embodiment shown in Figure 1, the actuator housing 1 includes an upper housing 15 and a lower housing 16, and a sealing ring 17 is provided between the upper housing 15 and the lower housing 16. The sealing ring 17 is used to seal the gap between the upper housing 15 and the lower housing 16 when the upper housing 15 and the lower housing 16 are connected to each other to prevent the brake fluid from flowing out. In addition, a bleed screw 18 is also provided on the actuator housing 1 for adjusting the pressure inside the actuator housing 1.

[0040] The driving structure is dynamically connected to the piston rod 12, and the piston rod 12 is adapted to rotate with the driving structure to drive the actuator piston 11 to move axially and press against the brake shoe, and the piston rod 12 is adapted to drive the actuator piston 11 to move axially and press against the brake shoe under the action of the oil pressure of the brake oil channel 13.

[0041] Specifically, the driving structure is connected to the piston rod 12 and can provide its own driving force to the piston rod 12 to make it move, that is, the piston rod 12 can rotate relative to the actuator housing 1 under the action of the driving structure, and then drive the actuator piston 11 to move axially to press against the brake shoe, thereby realizing the parking brake of the vehicle, and the piston rod 12 can move axially under the action of the oil pressure of the brake fluid in the brake oil channel 13, and then push the actuator piston 11 to move axially to press against the brake shoe, thereby realizing the service brake of the vehicle.

[0042] It should be noted that, as shown in Figure 1, two piston rods 12 and two actuator pistons 11 are provided in the actuator housing 1. The two piston rods 12 correspond to the two actuator pistons 11 one-to-one and are symmetrically arranged along the actuator housing 1, that is, a piston rod 12 and an actuator piston 11 are respectively provided on the left and right sides of the actuator housing 1 to ensure the reliability of braking, and the two piston rods 12 can simultaneously cause the actuator piston 11 to move axially under the action of the driving structure or brake fluid, so as to press against the brake shoe respectively to realize the parking brake or service brake of the vehicle, wherein the movement directions of the two actuator pistons 11 are opposite.

[0043] Therefore, by installing the piston rod 12 in the actuator housing 1, the driving member 211 is used to provide a driving force for the piston rod 12 to rotate relative to the actuator housing 1, thereby driving the actuator piston 11 to move axially, and then the actuator piston 11 is pressed against the brake shoe to achieve the parking brake of the vehicle, or the piston rod 12 is moved axially under the action of the oil pressure of the brake fluid in the brake oil channel 13 to push the actuator piston 11 to move axially, and then the actuator piston 11 is pressed against the brake shoe to achieve the service brake of the vehicle.

[0044] According to the brake actuator assembly 100 of the embodiment of the present application, the piston rod 12 can be rotated or moved axially under the action of the driving structure and the brake fluid, thereby driving the actuator piston 11 to move axially to press against the brake shoe, thereby realizing the parking brake and service brake of the vehicle, meeting user needs, and having a high overall integration level and a small number of parts, thereby reducing the setup cost and maintenance difficulty.

[0045] In some embodiments, the driving structure includes a power source assembly 21 and a transmission gear set 22 . The transmission gear set 22 is located in the actuator housing 1 . The power source assembly 21 is suitable for driving the piston rod 12 to rotate through the transmission gear set 22 .

[0046] Specifically, the driving structure is used to provide driving force for the piston rod 12, and the driving structure includes two parts, namely a power source component 21 and a transmission gear set 22, that is, the power source component 21 is used to provide power for the piston rod 12, and the transmission gear set 22 is used to realize the transmission of driving force, that is, the transmission gear set 22 can transmit the driving force provided by the power source component 21 to the piston rod 12.

[0047] Thus, the driving force generated by the power source assembly 21 can be first transmitted to the transmission gear set 22, and then transmitted to the piston rod 12 by the transmission gear set 22, and then the piston rod 12 can drive the execution piston 11 to move to press against the brake shoe to achieve the parking brake of the vehicle.

[0048] It should be noted that the transmission gear set 22 is also arranged in the actuator housing 1, that is, the actuator housing 1 not only provides an installation position for the piston rod 12, but also provides an installation position for the transmission gear set 22, thereby improving the integration of the brake actuator assembly 100.

[0049] In some embodiments, the transmission gear set 22 includes an input gear 221 , a bridge gear 222 and a slave pump gear 223 , and the input gear 221 , the bridge gear 222 and the slave pump gear 223 are rotatably mounted in the actuator housing 1 .

[0050] Specifically, the transmission gear set 22 is used to transmit the driving force generated by the power source component 21 to the piston rod 12, and the transmission gear set 22 includes three parts, namely the input gear 221, the bridge gear 222 and the slave pump gear 223, that is, the driving force generated by the power source component 21 can be transmitted to the input gear 221, the bridge gear 222 and the slave pump gear 223, and then the driving force is transmitted to the piston rod 12 through the rotation of the input gear 221, the bridge gear 222 and the slave pump gear 223 relative to the actuator housing 1, so that the piston rod 12 rotates relative to the actuator housing 1 to drive the actuator piston 11 to move axially to press against the brake shoe, thereby realizing the parking brake of the vehicle, and, the input gear 221, the bridge gear 222 and the slave pump gear 223 are all installed in the actuator housing 1, which can reduce the space occupied and further improve the integration of the brake actuator assembly 100.

[0051] It should be noted that a bridge gear shaft 2221 is further provided in the brake actuator assembly 100 for passing through the bridge gear 222 to achieve installation of the bridge gear 222 .

[0052] Among them, the input gear 221 is connected to the power source component 21, the input gear 221 and the slave pump gear 223 are respectively engaged with the bridge gear 222 for transmission, the slave pump gear 223 is sleeved on the outside of the piston rod 12 and cooperates with the piston rod 12 in circumferential transmission, and the piston rod 12 is movable axially relative to the slave pump gear 223.

[0053] Specifically, the input gear 221 is connected to the power source assembly 21, and the driving force generated by the power source assembly 21 can be transmitted to the input gear 221, and the input gear 221 and the slave cylinder gear 223 are respectively meshed with the cross-bridge gear 222, that is, the input gear 221 can transmit the driving force from the power source assembly 21 to the cross-bridge gear 222, and the cross-bridge gear 222 then transmits the driving force to the slave cylinder gear 223, thereby realizing the sequential transmission of the driving force. At the same time, the slave cylinder gear 223 is sleeved on the outside of the piston rod 12, so that the slave cylinder gear 223 can further transmit the driving force to the piston rod 12, causing the piston rod 12 to rotate relative to the actuator housing 1, and then drive the actuator piston 11 to move axially to press against the brake shoe, thereby realizing the parking brake of the vehicle, and the piston rod 12 can move axially relative to the slave cylinder gear 223 under the action of the oil pressure of the brake fluid, thereby pushing the actuator piston 11 to move axially to press against the brake shoe, thereby realizing the driving brake of the vehicle.

[0054] It should be noted that the axis of the input gear 221 , the axis of the bridge gear 222 , and the axis of the slave pump gear 223 are parallel and spaced apart, and are located in the same plane. The axle gear 222 is meshed with the slave pump gear 223, and the axle gear 222 is meshed with the slave pump gear 223, that is, the axis of the axle gear 222 is parallel to and spaced from the axis of the slave pump gear 223, that is, the axis of the input gear 221, the axis of the axle gear 222 and the axis of the slave pump gear 223 are parallel to and spaced from each other, and the axes of the three are arranged in the same plane, so that the input gear 221 and the slave pump gear 223 are spaced apart to avoid interference between the two, and the driving force generated by the power source assembly 21 can be transmitted to the input gear 221, the axle gear 222 and the slave pump gear 223 in sequence, and the reliability of the transmission of the driving force can be improved.

[0055] In some embodiments, a movable cavity 2232 with both ends open is formed in the slave pump gear 223 , there are two actuator pistons 11 and piston rods 12 , and the two actuator pistons 11 are correspondingly mounted outside the two piston rods 12 to form two sets of actuator structures 19 .

[0056] Specifically, as shown in Figure 1, an active chamber 2232 is formed inside the slave cylinder gear 223, and the active chamber 2232 is connected to the brake oil channel 13, so that the brake fluid in the brake oil channel 13 can flow into the active chamber 2232, and the active chamber 2232 is open to both ends so that the piston rod 12 can extend into the active chamber 2232 and cooperate with the slave cylinder gear 223, and two actuator pistons 11 and two piston rods 12 are provided in the brake actuator assembly, and the two actuator pistons 11 and the two piston rods 12 are arranged in a one-to-one correspondence, which can improve the reliability of the piston rod 12 pushing the actuator piston 11 to move.

[0057] In addition, the two actuator pistons 11 and the two piston rods 12 form two groups of actuator structures 19, that is, the two groups of actuator structures 19 respectively include an actuator piston 11 and a piston rod 12, and the actuator piston 11 is sleeved outside the piston rod 12, so that the actuator piston 11 can move axially under the drive of the piston rod 12 to realize the parking brake or driving brake of the vehicle.

[0058] One end of the two piston rods 12 extends from the two ends of the slave cylinder gear 223 to the active chamber 2232 respectively. The piston rod 12 is provided with an intermediate through hole 123 connected to the active chamber 2232. The actuator piston 11 is sleeved on the outside of the piston rod 12 and covered on the other end of the piston rod 12. The brake oil channel 13 is connected between the two groups of actuator structures 19 and is suitable for pushing the two groups of actuator structures 19 to move away from each other.

[0059] Specifically, the piston rods 12 located on both sides of the slave cylinder gear 223 extend from both ends of the slave cylinder gear 223 to the active chamber 2232 respectively, that is, an actuator piston 11 and a piston rod 12 are respectively provided on the left and right sides of the active chamber 2232, so that the two piston rods 12 can cooperate with the slave cylinder gear 223 on the left and right sides of the slave cylinder gear 223, so that the slave cylinder gear 223 can transmit the driving force of the driving member to the piston rod 12, thereby realizing the parking brake of the vehicle, and an intermediate through hole 123 is provided on both piston rods 12, and the intermediate through hole 123 is connected to the active chamber 2232, so that the brake fluid can flow into the intermediate through hole 123 to promote the movement of the actuator piston 11, thereby realizing the driving brake of the vehicle.

[0060] Among them, it should be noted that, as shown in Figures 1, 4-5, and 7-8, a tooth structure 122 is provided at the end of the piston rod 12 close to the slave pump gear 223, and at the same time, a groove 2231 is provided on the inner ring of the slave pump gear 223 to cooperate with the tooth structure 122 on the piston rod 12, so that the driving force is transmitted from the slave pump gear 223 to the piston rod 12 through the engagement between the groove 2231 and the tooth structure 122, and an external thread is provided at the end of the piston rod 12 close to the actuator piston 11, and an internal thread is provided on the actuator piston 11, and the connection between the piston rod 12 and the actuator piston 11 is realized by the cooperation of the external thread and the internal thread, so that the actuator piston 11 is driven to move by the movement of the piston rod 12.

[0061] The grooves 2231 and the toothed structure 122 are evenly distributed around the circumference of the slave cylinder gear 223 and the piston rod 12, respectively. The slave cylinder gear 223 and the piston rod 12 are connected via the grooves 2231 and the toothed structure 122, allowing the piston rod 12 to rotate as well as move axially. Consequently, the brake actuator assembly 100 enables both parking and service braking of the vehicle. The overall integration is high, the number of parts is small, and setup costs and maintenance are reduced. Furthermore, during service braking, the brake fluid pushes the piston rod 12 along the grooves 2231 of the slave cylinder gear 223. At this point, the brake fluid is stored in the grooves 2231, reducing the hydraulic pressure and amount of brake fluid required for the next service braking operation.

[0062] At the same time, the piston rod 12 is extended to the interior of the slave cylinder gear 223, and the driving force from the power source assembly 21 can be transmitted to the piston rod 12 through the slave cylinder gear 223, and the axis of the slave cylinder gear 223 coincides with the axis of the piston rod 12. At the same time, the actuator piston 11 is sleeved on the end of the piston rod 12, so that the actuator piston 11 can move axially under the drive of the piston rod 12 to realize the parking brake or driving brake of the vehicle, and the axis of the piston rod 12 coincides with the axis of the actuator piston 11, and the axis of the slave cylinder gear 223, the axis of the piston rod 12 and the axis of the actuator piston 11 coincide, which can avoid the abnormal gap between the brake shoe and the brake drum caused by excess or insufficient stroke of the actuator piston 11 during braking, thereby making the gap between the brake shoe and the brake drum more accurate and the positioning more accurate.

[0063] In addition, the brake oil channel 13 is connected to the two groups of actuator structures 19, that is, the brake fluid can flow between the two groups of actuator structures 19, pushing the two groups of actuator structures 19 from the middle to move in directions away from each other, and simultaneously pushing the piston rod 12 and the actuator piston 11 in a direction away from the slave cylinder gear 223, and then the actuator piston 11 can move under the action of the brake fluid to press against the brake shoe, thereby realizing the vehicle's driving braking.

[0064] Therefore, the actuator piston 11 can move not only under the action of the brake fluid in the groove, but also under the action of the brake fluid in the middle through hole 123, which can improve the reliability of the movement of the actuator piston 11 under the action of the brake fluid.

[0065] In some embodiments, the outer wall of the piston rod 12 is provided with a shoulder, and the shoulders of the two piston rods 12 are suitable for limiting and pressing against the two end surfaces of the slave cylinder gear 223 to form a reserved gap 124 between the ends of the two piston rods 12.

[0066] Specifically, a shoulder 121 is provided on the outer peripheral wall of the two piston rods 12, and the shoulder 121 extends outward from the outer peripheral wall of the piston rod 12, and is used to limit the piston rod 12 when the two piston rods 12 move toward the inside of the active chamber 2232, so as to avoid the piston rod 12 extending into the active chamber 2232 too long, so that the two piston rods 12 press against each other, and the piston rod 12 can maintain a specific relative motion stroke with the slave cylinder gear 223 and the actuator piston 11 on both sides of the shoulder 121, so as to ensure the accuracy during braking, and a reserved gap 124 can be formed between the ends of the two piston rods 12 close to each other. The reserved gap 124 is used to allow the brake fluid to flow here, pushing the two piston rods 12 and the two actuator pistons 11 to move respectively in the direction away from the slave cylinder gear 223, so as to press against the brake shoes respectively to realize the vehicle's service braking.

[0067] In some embodiments, the power source assembly 21 includes a driving member 211, a planetary gear set 212 and a driving shaft 213. The output end of the driving member 211 is dynamically connected to the planetary gear set 212, and the driving shaft 213 is dynamically connected between the planetary gear set 212 and the transmission gear set 22.

[0068] Specifically, the power source assembly 21 can provide driving force for the piston rod 12, and the power source assembly 21 includes a driving member 211, a planetary gear set 212 and a drive shaft 213, that is, the driving member 211 is used to provide driving force for the piston rod 12, and the output end of the driving member 211 is connected to the planetary gear set 212, so that the driving force generated by the driving member 211 can be transmitted to the planetary gear set 212, and, the drive shaft 213 is connected between the planetary gear set 212 and the transmission gear set 22, so that the driving force of the planetary gear set 212 can be transmitted to the transmission gear set 22 through the drive shaft 213, and then the driving force is transmitted from the transmission gear set 22 to the piston rod 12 to rotate the piston rod 12 relative to the actuator housing 1, thereby driving the actuator piston 11 to move axially to press against the brake shoe to achieve the parking brake of the vehicle.

[0069] It should be noted that, as shown in Figures 1 and 3, the drive shaft 213 can be constructed as a spline shaft, and the inner ring of the input gear 221 can be constructed as a spline. The driving force is transmitted from the planetary gear set 212 to the transmission gear set 22 through the cooperation between the spline shaft and the spline, which can further improve the reliability of the transmission of the driving force. In addition, the driving member 211 can use a motor to provide a power source for the piston rod 12.

[0070] In some embodiments, the power source assembly 21 also includes a mounting shell 214, which is connected to the outside of the actuator housing 1, and the driving member 211 and the planetary gear set 212 are both installed in the mounting shell 214. The drive shaft 213 is rotatably passed through the actuator housing 1 so that one end of the drive shaft 213 extends into the mounting shell 214 and the other end extends into the actuator housing 1.

[0071] Specifically, as shown in Figure 2, the mounting housing 214 is used to provide a mounting position for the driving member 211 and the planetary gear, and the actuator housing 1 is used to provide a mounting position for the transmission gear set 22 and the piston rod 12. The mounting housing 214 is arranged on the outside of the actuator housing 1, and one end of the drive shaft 213 is extended to the mounting housing 214, and the other end is extended to the actuator housing 1, and the drive shaft 213 can rotate relative to the actuator housing 1, so that the driving force generated by the driving member 211 can be transmitted from the planetary gear set 212 to the transmission gear set 22 through the rotation of the drive shaft 213, and then can be transmitted to the piston rod 12, so that the rotation of the piston rod 12 drives the actuator piston 11 to move axially to press against the brake shoe, thereby realizing the parking brake of the vehicle.

[0072] It should be noted that, as shown in Figure 1, a gasket 215 and a washer 216 are further provided between the driving member 211 and the actuator housing 1. The gasket 215 and the washer 216 can play a sealing role and improve the connection reliability between the driving member 211 and the actuator housing 1.

[0073] In some embodiments, an accommodating chamber 14 is formed in the actuator housing 1, and the piston rod 12 and the actuator piston 11 are both installed in the accommodating chamber 14. One end of the brake oil channel 13 is formed with an oil inlet hole 131 on the outside of the actuator housing 1 and the other end is formed with an oil outlet hole 132 open toward the accommodating chamber 14.

[0074] Specifically, as shown in Figures 1 and 6, the actuator housing 1 provides an installation position for the piston rod 12 and the actuator piston 11, that is, the piston rod 12 and the actuator piston 11 are both installed in the accommodating chamber 14 in the actuator housing 1, and the oil inlet hole 131 of the brake oil channel 13 is used to allow the brake fluid to enter the brake oil channel 13, and the oil inlet hole 131 is set on the outside of the actuator housing 1 to facilitate the user to fill the brake oil channel 13 with brake fluid, and the oil outlet hole 132 of the brake oil channel 13 is used to allow the brake fluid in the brake oil channel 13 to flow out, and the oil outlet hole 132 is opened toward the accommodating chamber 14, so that the brake fluid can enter the accommodating chamber 14 from the oil outlet hole 132, and under the action of oil pressure, the piston rod 12 is pushed to move axially relative to the slave cylinder gear 223, and then the actuator piston 11 can be pushed to move axially to press against the brake shoe, thereby realizing the vehicle's service braking.

[0075] It should be noted that a certain distance of gap is left between the slave cylinder gear 223 and the accommodating chamber 14 to ensure that the piston rods 12 on both sides of the actuator housing 1 can accurately control the movement trajectories of the two actuator pistons 11 to be the same except for the movement direction when braking, thereby ensuring the accuracy during braking.

[0076] Also, it should be noted that the present application controls the gap between the brake shoe and the brake drum through a program, that is, the present application is applicable to electronic drum brakes, and can effectively improve the adjustment accuracy so that the gap can be controlled within a precise range for each braking, and can reduce the use of personnel, reduce setting costs, and improve mechanical efficiency.

[0077] The present application also proposes a braking system 102 .

[0078] According to an embodiment of the present application, the braking system 102 includes a brake assembly 101 and a brake actuator assembly 100 of any one of the above-mentioned embodiments. The brake actuator assembly 100 is connected to the brake assembly 101, and the brake assembly 101 includes a brake shoe. The actuator piston 11 is movable relative to the actuator housing 1 to selectively press against the brake shoe.

[0079] Specifically, as shown in Figures 1, 9 and 10, the brake actuator assembly 100 is connected to the brake assembly 101, and the actuator piston 11 in the brake actuator assembly 100 can selectively press against the brake shoe in the brake assembly 101. When the actuator piston 11 moves axially relative to the actuator housing 1 to press against the brake shoe, the parking or driving braking force can be transmitted to the brake assembly 101 to achieve the parking brake or driving brake of the vehicle. When the actuator piston 11 is separated from the brake shoe, the parking brake or driving brake can be canceled. The overall integration is high, the number of parts is small, and the setup cost and maintenance difficulty are reduced.

[0080] The present application also discloses a vehicle.

[0081] The vehicle according to the embodiment of the present application is provided with the brake system 102 of the above-described embodiment. By providing this brake system 102, the actuator piston 11 can selectively press against the brake shoe to achieve parking or service braking of the vehicle, or to eliminate parking or service braking. Furthermore, the overall system has a high degree of integration and a small number of parts, which reduces installation costs and maintenance difficulties.

[0082] 1. In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 should not be understood as limiting the present application.

[0083] 2. In the description of this application, "first feature" and "second feature" may include one or more of these features.

[0084] 3. In the description of this application, “plurality” means two or more.

[0085] 4. In the description of this application, a first feature being “above” or “below” a second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but via another feature therebetween.

[0086] 5. In the description of this application, “above”, “above” and “above” a first feature to a second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0087] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0088] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A brake actuator assembly, wherein: include: An actuator housing, wherein an actuator piston and a piston rod are disposed within the actuator housing, wherein the piston rod is rotatably mounted within the actuator housing and is movable in the axial direction, wherein the actuator piston is sleeved on the piston rod and is movably connected to the piston rod, and wherein a brake oil passage is formed within the actuator housing; A drive structure, wherein the drive structure is dynamically connected to the piston rod, the piston rod is adapted to rotate with the drive structure to drive the actuator piston to move axially and press against the brake shoe, and the piston rod is adapted to drive the actuator piston to move axially and press against the brake shoe under the action of the oil pressure in the brake oil channel.

2. The brake actuator assembly according to claim 1, wherein: The driving structure includes a power source assembly and a transmission gear set. The transmission gear set is located in the actuator housing. The power source assembly is suitable for driving the piston rod to rotate through the transmission gear set.

3. The brake actuator assembly according to claim 2, wherein: The transmission gear set includes an input gear, a bridge gear and a slave pump gear, and the input gear, the bridge gear and the slave pump gear are rotatably mounted in the actuator housing respectively; Among them, the input gear is dynamically connected to the power source assembly, the input gear and the slave pump gear are respectively engaged with the bridge gear for transmission, the slave pump gear is sleeved outside the piston rod and cooperates with the piston rod for circumferential transmission, and the piston rod is movable axially relative to the slave pump gear.

4. The brake actuator assembly according to claim 3, wherein: A movable cavity with two ends open is formed in the slave pump gear, and there are two actuating pistons and two piston rods. The two actuating pistons are sleeved on the two piston rods in a one-to-one correspondence to form two sets of actuating structures; One end of the two piston rods extends from the two ends of the slave cylinder gear into the active cavity respectively. The piston rod is provided with an intermediate through hole connected to the active cavity. The actuator piston is sleeved outside the piston rod and covered outside the other end of the piston rod. The brake oil channel is connected between the two groups of the actuator structures and is suitable for pushing the two groups of the actuator structures to move away from each other.

5. The brake actuator assembly according to claim 4, wherein: The outer peripheral wall of the piston rod is provided with a shaft shoulder, and the shaft shoulders of the two piston rods are suitable for limiting and pressing against the two end faces of the slave cylinder gear, so that a reserved gap is formed between the ends of the two piston rods.

6. The brake actuator assembly according to any one of claims 2 to 5, wherein: The power source assembly includes a driving member, a planetary gear set and a driving shaft. The output end of the driving member is dynamically connected to the planetary gear set, and the driving shaft is dynamically connected between the planetary gear set and the transmission gear set.

7. The brake actuator assembly according to claim 6, wherein: The power source assembly also includes a mounting shell, which is connected to the outside of the actuator shell, and the driving member and the planetary gear set are both installed in the mounting shell. The drive shaft is rotatably inserted into the actuator shell so that one end of the drive shaft extends into the mounting shell and the other end extends into the actuator shell.

8. The brake actuator assembly according to any one of claims 1 to 7, wherein: An accommodating chamber is formed in the actuator housing, and the piston rod and the actuator piston are both installed in the accommodating chamber. One end of the brake oil channel is formed with an oil inlet hole on the outside of the actuator housing and the other end is formed with an oil outlet hole open to the accommodating chamber.

9. A braking system, wherein: The invention comprises a brake assembly and a brake actuator assembly according to any one of claims 1 to 8, wherein the brake actuator assembly is connected to the brake assembly, and the brake assembly comprises a brake shoe, and the actuator piston is movable relative to the actuator housing to selectively press against the brake shoe.

10. A vehicle, wherein: A brake system according to claim 9 is provided.

Images