An electronic parking brake assembly

Abstract

The present invention discloses an electronic parking brake assembly, which includes a base. An installation plate is fixedly installed on the surface of the base. A three-way pipe is integrally and fixedly connected to the surface of the installation plate. An oil inlet is arranged on the side of the three-way pipe, and an oil outlet is arranged on the top of the three-way pipe. A pressure sensor is installed at the output end of the oil outlet, which relates to the technical field of automotive accessories. After the DC motor in the electronic parking brake assembly is started, it can drive the threaded rod to rotate inside the sliding rod, drive the sliding rod to slide up and down inside the three-way pipe, and through the sealed sliding of the rubber ring with the inner wall of the oil outlet, it can change the state of the flowing oil inside the three-way pipe, making it closed or blocked, so as to realize the rapid clamping or locking of the brake or clutch, thereby preventing the rotation of the wheel or mechanical component and achieving the rapid response effect of braking. And when the DC motor is turned off, it can achieve emergency braking or rapid stop and rapid response, enhancing the stability after parking braking.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive parts, and particularly to an electronic parking brake assembly. Background Art

[0002] An electronic parking brake assembly is a modern parking system that realizes the parking function of a vehicle or a mechanical device through electronic control. It usually includes components such as an electronic control unit (ECU), sensors, actuators, and hydraulic or pneumatic systems. These components work together to precisely control and manage the braking and parking processes of the vehicle or device, improving the safety and efficiency of operation. The electronic parking brake system is widely used in automobiles and industrial equipment, especially in occasions that require precise control and quick response, such as parking on a steep slope, loading and unloading operations, and position control of mechanical equipment, where it plays an important role.

[0003] The actuators in existing electronic parking brake systems usually adopt two main structures: an electric motor or a solenoid valve. In either case, during braking, a relatively large number of transmission structures are required. For example, the complexity and losses of traditional mechanical transmission, such as transmission mechanisms like gear sets and belts, require additional space and components to transmit power, which increases the complexity and cost of the system. In addition, mechanical transmission itself generates friction and energy losses, which may reduce the efficiency of the system.

[0004] Therefore, those skilled in the art have provided an electronic parking brake assembly to solve the problems raised in the above background art. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the present invention provides an electronic parking brake assembly. By setting a three-way pipe, a threaded rod, and a sliding rod, etc., when the DC motor is started, it can drive the threaded rod to rotate inside the sliding rod, drive the sliding rod to slide up and down inside the three-way pipe, and through the sealed sliding of the rubber ring with the inner wall of the oil outlet, it can change the state of the flowing oil inside the three-way pipe, making it closed or blocked, so as to realize the rapid clamping or locking of the brake or clutch, thereby preventing the rotation of the wheel or mechanical component and achieving the rapid response effect of braking. This solves the problem that when traditional electronic parking brake assemblies brake, a relatively large number of transmission structures are required, and the complexity and losses of traditional mechanical transmission, such as transmission mechanisms like gears and belts, require additional space and components to transmit power, which increases the complexity and cost of the system. In addition, mechanical transmission itself generates friction and energy losses, which may reduce the efficiency of the system.

[0007] (2) Technical Solutions

[0008] To achieve the above object of setting a tee, a threaded rod, a sliding rod, etc., after starting the DC motor, it can drive the threaded rod to rotate inside the sliding rod, drive the sliding rod to slide up and down inside the tee, and through the sealing sliding of the rubber ring with the inner wall of the oil outlet, it can change the state of the flowing oil inside the tee to make it closed or blocked, so as to achieve the rapid clamping or locking of the brake or clutch, thereby preventing the rotation of the wheel or mechanical component and achieving the rapid response effect of braking. The present invention provides the following technical solutions: An electronic parking brake assembly includes a base, on the surface of which an installation plate is fixedly installed. An integrally fixed tee is connected to the surface of the installation plate. An oil inlet is provided on the side of the tee, and an oil outlet is provided on the top of the tee. A pressure sensor is installed at the output end of the oil outlet. A sliding rod is slidably connected inside the tee. A groove is formed on the outer surface of the sliding rod, and a rubber ring is installed inside the groove. A limiting plate is fixedly connected to the bottom of the sliding rod. A limiting groove is formed inside the tee. A threaded rod is threadedly connected inside the sliding rod. A lubrication assembly is installed inside the threaded rod. A positioning shaft is fixedly connected to the bottom of the threaded rod, and a positioning bearing is fixedly installed on the outer surface of the positioning shaft. A DC motor is fixedly installed on the outer surface of the base. A positioning assembly is installed at the output end of the DC motor, and a third bevel gear is fixedly connected to the output end of the positioning assembly. A fourth bevel gear is meshed with the surface of the third bevel gear.

[0009] Preferably, the bottom of the positioning shaft is fixedly connected to the center of the surface of the fourth bevel gear. The outer surface of the positioning bearing is fixedly installed inside the base. The outer surfaces of the third bevel gear and the fourth bevel gear are both rotatably connected inside the base.

[0010] Preferably, both the limiting plate and the limiting groove are hexagonal. The outer surface of the limiting plate is slidably connected inside the limiting groove. The sliding rod is sealingly connected to the inner wall of the oil outlet through the rubber ring. The inside of the oil outlet is communicated with the inside of the limiting groove.

[0011] Preferably, rotating grooves are equidistantly formed inside the limiting plate, and steel balls are movably installed inside the rotating grooves. The surface of the steel balls extends to the outer surface of the limiting plate and is in rolling connection with the inner wall of the limiting groove.

[0012] Preferably, the lubrication assembly includes a threaded copper rod threadedly connected inside the threaded rod. A sealing plate is fixedly connected to the top of the threaded copper rod. A liquid storage groove is formed inside the threaded rod. A sliding plate is sealingly slidably connected inside the liquid storage groove. Oil outlet holes are equidistantly formed at the top of the surface of the threaded rod. An oil injection valve is fixedly installed at the top of the threaded rod.

[0013] Preferably, an expansion liquid is filled between the threaded copper rod and the sliding plate inside the liquid storage tank. The expansion liquid is alcohol, and a sealing ring is fixedly installed on the outer surface of the sliding plate.

[0014] Preferably, the output end of the oil injection valve is communicated with the inside of the liquid storage tank, and lubricating oil is filled between the sliding plate and the oil injection valve inside the liquid storage tank.

[0015] Preferably, the positioning assembly includes a rotating shaft fixedly connected to the output end of the DC motor. A first bevel gear is fixedly connected to the outer surface of the rotating shaft. The inside of the rotating shaft is slidably connected with clamping plates at equal intervals. The outer surface of the rotating shaft is rotatably connected with a connecting rod through a bearing. An internal threaded ring is fixedly connected to the inside of the connecting rod. A transition gear is fixedly connected to the outer surface of the connecting rod. An adjustment groove is formed inside the base. A clamping block is slidably connected to the inside of the adjustment groove in a non-sealed manner. A return spring is movably installed inside the adjustment groove. A communicating pipe communicating with the inside of the adjustment groove is fixedly connected to the inside of the base. An adjustment cavity is formed inside the base. A piston rod is slidably connected to the inside of the adjustment cavity in a sealed manner. A rotating rod is rotatably connected to the surface of the piston rod. A transmission rod is rotatably connected to the inside of the base through a bearing. A cam is fixedly connected to one end of the transmission rod. A second bevel gear is fixedly connected to the other end of the transmission rod. The surface of the second bevel gear is meshed with the surface of the first bevel gear. An air pipe is fixedly connected to the inside of the base.

[0016] Preferably, the rotating rod is rotatably connected to the eccentric position of the cam. Check valves are fixedly installed inside both the air pipe and the communicating pipe. The outside of the base is communicated with the inside of the adjustment cavity through the air pipe and the check valve. The adjustment cavity is communicated with the inside of the adjustment groove through the check valve inside the communicating pipe.

[0017] Preferably, a card slot matching the transition gear is provided on the surface of the clamping block. Under normal conditions, due to the elasticity of the return spring inside the adjustment groove, the surface of the clamping block is meshed and clamped on the surface of the transition gear. The width of the clamping plate near the center position of the rotating shaft is greater than that of the other end. A limiting spring is movably installed on the outer surface of the clamping plate. Under normal conditions, due to the elasticity of the limiting spring, the clamping plate slides into the rotating shaft.

[0018] (III) Beneficial Effects

[0019] Compared with the prior art, the present invention provides an electronic parking brake assembly, which has the following beneficial effects:

[0020] 1. The electronic parking brake assembly, by setting a tee, a threaded rod, a sliding rod, etc., when the DC motor is started, can drive the threaded rod to rotate inside the sliding rod, drive the sliding rod to slide up and down inside the tee, and through the sealing sliding of the rubber ring with the inner wall of the oil outlet, can change the state of the flowing oil inside the tee, making it closed or blocked, so as to realize the rapid clamping or locking of the brake or clutch, thereby preventing the rotation of the wheel or mechanical component and achieving the rapid response effect of braking.

[0021] 2. The electronic parking brake assembly, by setting a lubricating assembly, when the friction between the threaded rod and the sliding rod is too large after long-term use, due to the high temperature generated by the friction, the lubricating oil inside the liquid storage tank automatically flows through the oil outlet hole into the connection between the threaded rod and the sliding rod, can achieve the automatic lubrication effect, reduce wear, and extend the service life of the driving part.

[0022] 3. The electronic parking brake assembly, by setting a positioning assembly, when the DC motor is turned off, can achieve the rapid braking of the fourth bevel gear, can limit the sliding position of the sliding rod, which is very important for applications that require emergency braking or rapid stop, can significantly improve safety and response speed, and strengthen the stability after parking braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of an electronic parking brake assembly proposed by the present invention;

[0024] Figure 2 is an exploded view of an electronic parking brake assembly proposed by the present invention;

[0025] Figure 3 is a schematic structural diagram of a sliding rod in an electronic parking brake assembly proposed by the present invention;

[0026] Figure 4 is a schematic structural diagram of a rubber ring in an electronic parking brake assembly proposed by the present invention;

[0027] Figure 5 is a partial cross-sectional view of a tee in an electronic parking brake assembly proposed by the present invention.

[0028] Figure 6 is a cross-sectional view of a threaded rod in an electronic parking brake assembly proposed by the present invention.

[0029] Figure 7 is a cross-sectional view of a base in an electronic parking brake assembly proposed by the present invention.

[0030] Figure 8 is Figure 7 an enlarged view of part A in

[0031] Figure 9A cross-sectional view of the rotating shaft in an electronic parking brake assembly proposed by the present invention.

[0032] In the figure: 1, base; 2, mounting plate; 3, tee pipe; 4, oil inlet; 5, oil outlet; 6, sliding rod; 7, groove; 8, rubber ring; 9, limiting plate; 91, steel ball; 10, limiting groove; 11, threaded rod; 12, lubrication assembly; 121, threaded copper rod; 122, sealing plate; 123, liquid storage tank; 124, sliding plate; 125, oil outlet hole; 126, oil injection valve; 13, positioning shaft; 14, positioning bearing; 15, DC motor; 16, positioning assembly; 161, rotating shaft; 162, first bevel gear; 163, clamping plate; 1631, limiting spring; 164, connecting rod; 165, internal thread ring; 166, intermediate gear; 167, adjusting groove; 168, clamping block; 169, communicating pipe; 1610, adjusting cavity; 1611, piston rod; 1612, rotating rod; 1613, cam; 1614, transmission rod; 1615, second bevel gear; 1616, air pipe; 17, third bevel gear; 18, fourth bevel gear. Detailed implementation manners

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to Figures 1-9, an electronic parking brake assembly, comprising a base 1, a mounting plate 2 fixedly installed on the surface of the base 1, a tee pipe 3 integrally and fixedly connected to the surface of the mounting plate 2, an oil inlet 4 provided on the side of the tee pipe 3, an oil outlet 5 provided on the top of the tee pipe 3, a pressure sensor installed at the output end of the oil outlet 5, a sliding rod 6 slidably connected inside the tee pipe 3, a groove 7 formed on the outer surface of the sliding rod 6, a rubber ring 8 installed inside the groove 7, a limiting plate 9 fixedly connected to the bottom of the sliding rod 6, a rotating groove equidistantly formed inside the limiting plate 9, a steel ball 91 movably installed inside the rotating groove, the surface of the steel ball 91 extending to the outer surface of the limiting plate 9 and rollingly connected to the inner wall of the limiting groove 10, a limiting groove 10 formed inside the tee pipe 3, both the limiting plate 9 and the limiting groove 10 being hexagonal, the outer surface of the limiting plate 9 slidably connected inside the limiting groove 10, the sliding rod 6 hermetically connected to the inner wall of the oil outlet 5 through the rubber ring 8, the inside of the oil outlet 5 being communicated with the inside of the limiting groove 10, a threaded rod 11 threadedly connected inside the sliding rod 6, a lubricating assembly 12 installed inside the threaded rod 11, a positioning shaft 13 fixedly connected to the bottom of the threaded rod 11, a positioning bearing 14 fixedly installed on the outer surface of the positioning shaft 13, a DC motor 15 fixedly installed on the outer surface of the base 1, a positioning assembly 16 installed at the output end of the DC motor 15, a third bevel gear 17 fixedly connected to the output end of the positioning assembly 16, a fourth bevel gear 18 meshingly connected to the surface of the third bevel gear 17, the bottom of the positioning shaft 13 fixedly connected to the center of the surface of the fourth bevel gear 18, the outer surface of the positioning bearing 14 fixedly installed inside the base 1, the outer surfaces of both the third bevel gear 17 and the fourth bevel gear 18 rotatably connected inside the base 1. By providing the tee pipe 3, the threaded rod 11 and the sliding rod 6, etc., when the DC motor 15 is started, it can drive the threaded rod 11 to rotate inside the sliding rod 6, drive the sliding rod 6 to slide up and down inside the tee pipe 3, and through the sealed sliding of the rubber ring 8 with the inner wall of the oil outlet 5, it can change the state of the oil flowing inside the tee pipe 3 to make it closed or blocked, thereby realizing the rapid clamping or locking of the brake or clutch, thus preventing the rotation of the wheel or mechanical component and achieving the rapid response effect of braking;

[0035] The lubricating assembly 12 includes a threaded copper rod 121 fixedly connected by threads inside the threaded rod 11. A sealing plate 122 is fixedly connected to the top of the threaded copper rod 121. A liquid storage tank 123 is formed inside the threaded rod 11. A sliding plate 124 is hermetically and slidably connected inside the liquid storage tank 123. Oil outlet holes 125 are equidistantly formed at the top surface of the threaded rod 11. An oil injection valve 126 is fixedly installed at the top of the threaded rod 11. An expansion liquid is filled between the threaded copper rod 121 and the sliding plate 124 inside the liquid storage tank 123. The expansion liquid is alcohol. A sealing ring is fixedly installed on the outer surface of the sliding plate 124. The output end of the oil injection valve 126 is communicated with the inside of the liquid storage tank 123. Lubricating oil is filled between the sliding plate 124 and the oil injection valve 126 inside the liquid storage tank 123. By providing the lubricating assembly 12, when the friction between the threaded rod 11 and the sliding rod 6 is too large after long-term use, due to the high temperature generated by the friction, the lubricating oil inside the liquid storage tank 123 automatically flows into the connection between the threaded rod 11 and the sliding rod 6 through the oil outlet holes 125, which can achieve an automatic lubrication effect, reduce wear, and extend the service life of the driving part;

[0036] The positioning component 16 includes a rotating shaft 161 fixedly connected to the output end of the DC motor 15. A first bevel gear 162 is fixedly connected to the outer surface of the rotating shaft 161. A clamping plate 163 is slidably connected to the inside of the rotating shaft 161 at equal intervals. A connecting rod 164 is rotatably connected to the outer surface of the rotating shaft 161 through a bearing. An internal thread ring 165 is fixedly connected to the inside of the connecting rod 164. A transition gear 166 is fixedly connected to the outer surface of the connecting rod 164. An adjustment groove 167 is formed inside the base 1. A clamping block 168 is slidably connected to the inside of the adjustment groove 167 in a non-sealed manner. A return spring is movably installed inside the adjustment groove 167. A communication pipe 169 connected to the inside of the adjustment groove 167 is fixedly connected to the inside of the base 1. An adjustment cavity 1610 is formed inside the base 1. A piston rod 1611 is slidably connected to the inside of the adjustment cavity 1610 in a sealed manner. A rotating rod 1612 is rotatably connected to the surface of the piston rod 1611. A transmission rod 1614 is rotatably connected to the inside of the base 1 through a bearing. A cam 1613 is fixedly connected to one end of the transmission rod 1614. A second bevel gear 1615 is fixedly connected to the other end of the transmission rod 1614. The surface of the second bevel gear 1615 is meshed with the surface of the first bevel gear 162. An air pipe 1616 is fixedly connected to the inside of the base 1. The rotating rod 1612 is rotatably connected to the eccentric position of the cam 1613. Check valves are fixedly installed inside both the air pipe 1616 and the communication pipe 169. The outside of the base 1 is connected to the inside of the adjustment cavity 1610 through the air pipe 1616 and the check valve. The adjustment cavity 1610 is connected to the inside of the adjustment groove 167 through the check valve inside the communication pipe 169. A card slot matching the transition gear 166 is provided on the surface of the clamping block 168. Under normal conditions, due to the elasticity of the return spring inside the adjustment groove 167, the surface of the clamping block 168 is meshed and clamped with the surface of the transition gear 166. The width of the clamping plate 163 near the center of the rotating shaft 161 is greater than the width of the other end. A limiting spring 1631 is movably installed on the outer surface of the clamping plate 163. Under normal conditions, due to the elasticity of the limiting spring 1631, the clamping plate 163 slides into the rotating shaft 161. By providing the positioning component 16, when the DC motor 15 is turned off, the fourth bevel gear 18 can be quickly braked, the sliding position of the sliding rod 6 can be limited, which is very important for applications that require emergency braking or quick stop, can significantly improve safety and response speed, and enhance the stability after parking braking.

[0037] In summary, when the electronic parking brake assembly is in use, by starting the DC motor 15, the DC motor 15 drives the rotation of the rotating shaft 161. The rotating shaft 161 drives the rotation of the second bevel gear 1615 through the first bevel gear 162. The second bevel gear 1615 drives the movement of the rotating rod 1612 through the transmission rod 1614 and the cam 1613. The rotating rod 1612 drives the piston rod 1611 to slide inside the adjustment cavity 1610. When the piston rod 1611 slides to the left, the air inside the adjustment cavity 1610 enters the adjustment groove 167 through the communication pipe 169. When the piston rod 1611 slides to the right, the inside of the communication pipe 169 is in an open circuit, and the external air enters the adjustment cavity 1610 through the air pipe 1616. Therefore, when the piston rod 1611 slides, a rapid pressurization process inside the adjustment groove 167 is realized, and the block 168 slides away from the intermediate gear 166. At this time, the intermediate gear 166 can rotate freely. When the rotating shaft 161 rotates, due to centrifugal force, the clamping plate 163 is thrown out from the inside of the rotating shaft 161, so that the clamping plate 163 is clamped with the internal thread ring 165, and the connecting rod 164 is driven to rotate through the internal thread ring 165. The connecting rod 164 drives the threaded rod 11 to rotate through the third bevel gear 17, the fourth bevel gear 18, and the positioning shaft 13. Then, through the meshing between the threaded rod 11 and the inside of the sliding rod 6, the sliding rod 6 is driven to slide up and down inside the tee pipe 3, which can change the state of the flowing oil inside the tee pipe 3, making it closed or blocked, so as to realize the rapid clamping or locking of the brake or clutch, thereby preventing the rotation of the wheel or mechanical component, and achieving the rapid response effect of braking. When the DC motor 15 is powered off, due to the elasticity of the limit spring 1631, the clamping plate 163 retracts into the rotating shaft 161. At the same time, the high pressure inside the adjustment groove 167 will also be quickly discharged, and through the elasticity of the adjustment groove 167, the block 168 is clamped on the surface of the intermediate gear 166, which can realize the rapid braking of the fourth bevel gear 18, and can limit the sliding position of the sliding rod 6. This is very important for applications that require emergency braking or rapid stop, can significantly improve safety and response speed, and enhance the stability after parking braking.

[0038] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made therein without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electronic parking brake assembly, comprising a base (1), characterized in that: A mounting plate (2) is fixedly mounted on the surface of the base (1); a three-way pipe (3) is integrally fixedly connected to the surface of the mounting plate (2); an oil inlet (4) is arranged on the side of the three-way pipe (3); an oil outlet (5) is arranged on the top of the three-way pipe (3); a pressure sensor is installed at the output end of the oil outlet (5); a sliding rod (6) is slidably connected inside the three-way pipe (3); a groove (7) is provided on the outer surface of the sliding rod (6); a rubber ring (8) is installed inside the groove (7); a limiting plate (9) is fixedly connected to the bottom of the sliding rod (6); a limiting groove is provided inside the three-way pipe (3). (10), the internal thread of the sliding rod (6) is connected to a threaded rod (11), a lubrication assembly (12) is installed inside the threaded rod (11), a positioning shaft (13) is fixedly connected to the bottom of the threaded rod (11), a positioning bearing (14) is fixedly installed on the outer surface of the positioning shaft (13), a DC motor (15) is fixedly installed on the outer surface of the base (1), a positioning assembly (16) is installed at the output end of the DC motor (15), a third bevel gear (17) is fixedly connected to the output end of the positioning assembly (16), and a fourth bevel gear (18) is meshingly connected to the surface of the third bevel gear (17); The positioning assembly (16) comprises a rotating shaft (161) fixedly connected to the output end of the DC motor (15); the outer surface of the rotating shaft (161) is fixedly connected to a first bevel gear (162); the interior of the rotating shaft (161) is equidistantly slidably connected to a clamping plate (163); the outer surface of the rotating shaft (161) is rotatably connected to a connecting rod (164) via a bearing; the interior of the connecting rod (164) is fixedly connected to an internal threaded ring (165); the outer surface of the connecting rod (164) is fixedly connected to a transition gear (166); an adjusting groove (167) is provided inside the base (1); a clamping block (168) is non-sealed and slidably connected inside the adjusting groove (167); a return spring is movably installed inside the adjusting groove (167); A connecting pipe (169) communicating with the inside of the adjusting groove (167) is fixedly connected inside the base (1); an adjusting chamber (1610) is provided inside the base (1); a piston rod (1611) is sealingly and slidably connected inside the adjusting chamber (1610); a rotating rod (1612) is rotatably connected to the surface of the piston rod (1611); a transmission rod (1614) is rotatably connected inside the base (1) via a bearing; one end of the transmission rod (1614) is fixedly connected to a cam (1613); the other end of the transmission rod (1614) is fixedly connected to a second bevel gear (1615); the surface of the second bevel gear (1615) is meshingly connected to the surface of the first bevel gear (162); and an air pipe (1616) is fixedly connected inside the base (1); The rotating rod (1612) is rotatably connected to the eccentric position of the cam (1613); one-way valves are fixedly installed inside the air pipe (1616) and the connecting pipe (169); the outside of the base (1) is connected to the inside of the regulating chamber (1610) through the air pipe (1616) and the one-way valve; the regulating chamber (1610) is connected to the inside of the regulating groove (167) through the one-way valve inside the connecting pipe (169).

2. An electronic parking brake assembly according to claim 1, characterized in that: The bottom of the positioning shaft (13) is fixedly connected to the center of the surface of the fourth bevel gear (18), the outer surface of the positioning bearing (14) is fixedly mounted inside the base (1), and the outer surfaces of the third bevel gear (17) and the fourth bevel gear (18) are both rotatably connected to the inside of the base (1).

3. The electronic parking brake assembly according to claim 1, characterized in that: The limiting plate (9) and the limiting groove (10) are both hexagonal, the outer surface of the limiting plate (9) is slidably connected to the inside of the limiting groove (10), the sliding rod (6) is sealed to the inner wall of the oil outlet (5) via a rubber ring (8), and the inside of the oil outlet (5) is connected to the inside of the limiting groove (10).

4. The electronic parking brake assembly according to claim 1, characterized in that: The limiting plate (9) has rotating grooves formed at equal intervals inside, and steel balls (91) are movably mounted inside the rotating grooves. The surfaces of the steel balls (91) extend to the outer surface of the limiting plate (9) and are rollingly connected to the inner wall of the limiting groove (10).

5. The electronic parking brake assembly according to claim 1, characterized in that: The lubrication assembly (12) comprises a threaded copper rod (121) fixedly threadedly connected to the inside of the threaded rod (11); a sealing plate (122) is fixedly connected to the top of the threaded copper rod (121); a liquid storage tank (123) is provided inside the threaded rod (11); a sliding plate (124) is sealingly and slidably connected to the inside of the liquid storage tank (123); oil outlet holes (125) are equidistantly provided on the top of the surface of the threaded rod (11); and an oil filling valve (126) is fixedly installed on the top of the threaded rod (11).

6. An electronic parking brake assembly according to claim 5, characterized in that: The liquid storage tank (123) is filled with expansion liquid located between the threaded copper rod (121) and the sliding plate (124), wherein the expansion liquid is alcohol, and a sealing ring is fixedly mounted on the outer surface of the sliding plate (124).

7. An electronic parking brake assembly according to claim 6, characterized in that: The output end of the oil injection valve (126) is in communication with the interior of the liquid storage tank (123), and the interior of the liquid storage tank (123) is filled with lubricating oil between the sliding plate (124) and the oil injection valve (126).

8. The electronic parking brake assembly according to claim 1, characterized in that: The surface of the clamping block (168) is provided with a clamping groove matching the transition gear (166); under normal conditions, the surface of the clamping block (168) is meshed and clamped on the surface of the transition gear (166) through the elasticity of the internal reset spring of the adjustment groove (167); the width of the clamping plate (163) close to the center of the rotating shaft (161) is greater than the width at the other end; a limit spring (1631) is movably installed on the outer surface of the clamping plate (163); under normal conditions, the elasticity of the limit spring (1631) causes the clamping plate (163) to slide into the interior of the rotating shaft (161).

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