CN117231649A

CN117231649A - Drum brake, braking system and vehicle with drum brake

Info

Publication number: CN117231649A
Application number: CN202311313554.2A
Authority: CN
Inventors: 李小刚; 史剑宗; 陈讬
Original assignee: Dongfeng Motor Corp
Current assignee: Dongfeng Motor Corp
Priority date: 2023-10-11
Filing date: 2023-10-11
Publication date: 2023-12-15

Abstract

The application relates to a drum brake, a braking system and a vehicle thereof, comprising: the brake device comprises a brake drum, a brake assembly, a transmission assembly, an electric control execution device and an EPB execution device, wherein the brake assembly comprises a brake shoe; the transmission assembly is connected with the brake shoe; the electric control execution device is connected with the transmission assembly and used for controlling the transmission assembly according to a control instruction of the brake execution unit so as to drive the brake shoe to abut against or loosen the brake drum; the EPB executing device is connected with the brake shoes and is used for driving the brake shoes to abut against or loosen the brake drum according to the control command of the brake executing unit. According to the application, the brake system is small in size and can be integrally arranged beside the wheel by using the wire control executing device, namely the electric control executing device and the EPB executing device, so that the cost of the brake system can be well reduced, and meanwhile, the brake response speed is faster and the brake comfort performance is good by using the wire control braking mode.

Description

Drum brake, braking system and vehicle with drum brake

Technical Field

The application relates to the field of automobile brake systems, in particular to a drum brake, a brake system and a vehicle with the drum brake.

Background

In the traditional hydraulic or pneumatic braking system, obvious defects of complex gas-liquid pipeline, difficult maintenance, complex arrangement structure, slow braking dynamic response, low braking comfort performance and the like exist. For example, in a hydraulic brake system, a rebound vibration phenomenon occurs in a brake pedal when an antilock brake system is operated, which affects a brake comfort performance. For example, in the conventional hydraulic brake system, because components of a conventional hydraulic brake system such as a vacuum brake booster, a brake master cylinder, an oil reservoir and the like with large volume are adopted, the hydraulic brake system has the problems of complex structure and assembly, large volume and difficult maintenance, and because the hydraulic brake pipeline and brake fluid for connecting the corresponding components are arranged in the system, the problems of periodically replacing hydraulic oil and periodically checking whether the hydraulic oil leaks or not are required.

Disclosure of Invention

The application provides a drum brake, a brake system and a vehicle thereof, which can solve the problems of complex structure and assembly and large volume in a hydraulic or pneumatic brake system in the related art.

In a first aspect, there is provided a drum brake comprising: the brake device comprises a brake drum, a brake assembly, a transmission assembly, an electric control execution device and an EPB execution device, wherein the brake assembly comprises a brake shoe; the transmission assembly is connected with the brake shoe; the electric control execution device is connected with the transmission assembly and used for controlling the transmission assembly according to a control instruction of the brake execution unit so as to drive the brake shoe to abut against or loosen the brake drum; the EPB executing device is connected with the brake shoes and used for driving the brake shoes to abut against or loosen the brake drum according to the control instruction of the brake executing unit.

In some embodiments, the transmission assembly includes: the brake device comprises a threaded cylinder, a first screw and a transmission mechanism, wherein one end of the first screw is in threaded connection with the inside of the threaded cylinder, and the other end of the first screw is connected with a brake shoe; the transmission mechanism is connected with the threaded cylinder and the electric control execution device and is used for driving the threaded cylinder to rotate under the driving of the electric control execution device so that the first screw drives the brake shoe to abut against or loosen the brake drum.

In some embodiments, the transmission mechanism comprises: the pull rod is in transmission connection with the threaded cylinder; one end of the nut is connected with the electric control executing device, and the other end of the nut is driven to rotate downwards by the pull rod so as to drive the pull rod to stretch along a straight line.

In some embodiments, the surface of the thread cylinder is provided with a thread groove; the pull rod includes: the stud is in threaded connection with the nut; one end of the toothed plate is fixedly connected with the stud, and the toothed plate is in transmission connection with the threaded cylinder through the threaded groove.

In some embodiments, the transmission mechanism comprises: the first gear is arranged on the outer peripheral surface of the threaded cylinder; the second gear is connected with the electric control executing device, and the second gear is meshed with the first gear.

In some embodiments, the electronic control executing device includes: the first motor is connected with the transmission assembly.

In some embodiments, the electrically controlled actuator further comprises a first gearbox, and the first motor is connected to the transmission assembly through the first gearbox.

In some embodiments, the EPB execution apparatus includes: the cable comprises a second motor, a second screw rod, a threaded sleeve and a cable body, wherein the second screw rod is connected with the second motor; the screw sleeve is sleeved on the outer peripheral surface of the second screw rod and is in threaded connection with the second screw rod; one end of the inhaul cable body is connected with the threaded sleeve, and the other end of the inhaul cable body is connected with the brake shoe.

In some embodiments, the EPB execution apparatus further comprises: the second motor is connected with the second screw rod through the second gearbox.

In some embodiments, the EPB execution device further comprises a cable balancer, and the cable body is disposed inside the cable balancer in a penetrating manner.

In some embodiments, the other end of the guy cable body is connected with a transmission assembly, and the EPB executing device is used for controlling the transmission assembly according to a control instruction of the brake executing unit so as to drive the brake shoe to abut against or loosen the brake drum; or the other end of the inhaul cable body is connected with the brake shoe, and the EPB executing device is used for driving the brake shoe to abut against or loosen the brake drum according to a control instruction of the brake executing unit.

In some embodiments, the brake drum interior forms an installation space; the brake assembly further comprises: the pin shaft is positioned in the installation space, and the brake shoe is hinged with the pin shaft; the return spring is connected between the pin shaft and the brake shoe.

In some embodiments, the brake drum is internally provided with an installation space, and the brake shoes are provided with two brake shoes; the brake assembly further comprises: the pin shafts are positioned in the installation space, and the two brake shoes are symmetrically distributed on two sides of the pin shafts along the radial direction of the pin shafts and are hinged with the pin shafts; the return spring is connected between the pin shaft and the brake shoe; the connecting rod device is hinged between the two brake shoes; when one brake shoe is abutted with the brake drum, the connecting rod device drives the other brake shoe to be abutted with the brake drum, and when one brake shoe is separated from the brake drum, the connecting rod device drives the other brake shoe to loosen the brake drum.

In some embodiments, the linkage includes: the brake device comprises a first connecting rod and a second connecting rod, wherein one end of the first connecting rod is hinged with one brake shoe; the second connecting rod is vertically arranged between the two brake shoes, one end of the second connecting rod is hinged with the first connecting rod, an included angle is formed between the first connecting rod and the second connecting rod, and the other end of the second connecting rod is connected with the other brake shoe.

In some embodiments, a friction plate is connected to the inner wall of the brake drum, and the surface of the brake shoe is a friction surface, and the friction surface is used for being attached to the friction plate.

In a second aspect, there is provided a brake system comprising: the drum brake and the brake actuating unit are electrically connected with the electric control actuating device and the EPB actuating device and are used for sending control instructions to the electric control actuating device and/or the EPB actuating device.

In some embodiments, the brake actuation unit is further configured to receive a service brake request and a parking brake request; when the brake execution unit receives a service brake request, the brake execution unit sends a control instruction to the electric control execution device; when the brake actuating unit receives a parking brake request, the brake actuating unit sends a control instruction to the EPB actuating device.

In some embodiments, the EPB actuator comprises a second motor, a second screw, a threaded sleeve, and a cable body, the second screw being coupled to the second motor; the screw sleeve is sleeved on the outer peripheral surface of the second screw rod and is in threaded connection with the second screw rod; one end of the inhaul cable body is connected with the threaded sleeve, and the other end of the inhaul cable body is connected with the brake shoe.

In some embodiments, the cable body includes: the first inhaul cable is connected with the threaded sleeve; the second cable is arranged inside the cable balancer in a penetrating mode, the first cable is connected with the second cable, and two ends of the second cable are both brake shoe connecting ends.

In a third aspect, there is provided a vehicle comprising: a braking system as described above.

The technical scheme provided by the embodiment of the application has the beneficial effects that at least:

the embodiment of the application provides a drum brake, a brake system and a vehicle thereof, wherein a brake system is small in size and can be integrally arranged beside a wheel by replacing a hydraulic or pneumatic braking mode through a wire control executing device, namely an electric control executing device and an EPB executing device, so that the cost of the brake system can be well reduced, and meanwhile, the brake response speed is higher and the brake comfort performance is good through a wire control braking mode.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a first drum brake according to an embodiment of the present application;

fig. 2 is a schematic diagram of an electric control executing device according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a braking system according to an embodiment of the present application;

FIG. 4 is a schematic diagram of an EPB executing device according to an embodiment of the present application;

FIG. 5 is a schematic illustration of a second drum brake according to an embodiment of the present application;

FIG. 6 is a schematic illustration of a third drum brake according to an embodiment of the present application;

fig. 7 is a schematic view of an electric control actuator and a transmission assembly in a third drum brake according to an embodiment of the present application.

In the figure: 1. a brake drum; 2. a brake assembly; 20. a brake shoe; 21. a return spring; 22. a link device; 23. a pin shaft; 3. a mounting base plate; 4. a transmission assembly; 40. a pull rod; 41. a thread cylinder; 42. a first screw; 43. a first gear; 44. a nut; 45. a second gear; 5. an electric control executing device; 50. a first motor; 51. a first spindle; 52. a first gearbox; 53. a first output shaft; 6. a wheel; 7. a brake execution unit; 8. EPB execution means; 80. a second motor; 81. a second spindle; 82. a second gearbox; 83. a second output shaft; 84. a second screw; 85. a screw sleeve; 86. a guy cable body; 87. a cable balancer; 88. an electric wire.

Detailed Description

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Referring to fig. 1 to 7, the embodiment of the present application provides a drum brake, a brake system and a vehicle thereof, which can solve the problems of complicated structure and assembly and large volume in the hydraulic or pneumatic brake system in the related art.

Therefore, in the hydraulic or pneumatic brake system, there is a problem in that the structure and assembly are complicated and the volume is large. In a first aspect, an embodiment of the present application provides a drum brake comprising: a brake drum 1, a brake assembly 2, a transmission assembly 4, an electric control executing device 5 and an EPB executing device 8, wherein the brake assembly 2 comprises a brake shoe 20; the transmission assembly 4 is connected with the brake shoe 20; the electric control executing device 5 is connected with the transmission assembly 4 and is used for controlling the transmission assembly 4 according to a control instruction of the brake executing unit 7 so as to drive the brake shoe 20 to abut against or loosen the brake drum 1; the EPB actuator 8 is connected to the brake shoes 20 and is adapted to actuate the brake shoes 20 against or release the brake drum 1 in response to control commands from the brake actuator 7.

According to the application, the brake system is small in size and can be integrally arranged beside the wheels 6 by using the wire control executing device, namely the electric control executing device 5 and the EPB executing device 8, so that the cost of the brake system can be well reduced, and meanwhile, the brake response speed is faster and the brake comfort performance is good by using the wire control braking mode.

Wherein the brake actuating unit 7 is used for receiving a service brake request and a parking brake request. When the brake execution unit 7 receives a service brake request, the brake execution unit 7 sends a control instruction to the electric control execution device 5, wherein the control instruction is a service brake control instruction, and the electric control execution device 5 controls the transmission assembly 4 according to the control instruction of the brake execution unit 7 so as to drive the brake shoe 20 to abut against the brake drum 1; when the brake execution unit 7 receives a parking brake request, the brake execution unit 7 sends a control command to the EPB execution device 8, wherein the control command is a parking brake control command, and the EPB execution device 8 drives the brake shoe 20 to abut against the brake drum 1 according to the control command of the brake execution unit 7.

The brake shoe 20 is movably connected to the mounting base plate 3. The inner wall of the brake drum 1 is connected with a friction plate, the surface of the brake shoe 20 is a friction surface, and the friction surface is used for being attached to the friction plate.

In some possible embodiments, as shown in fig. 1, the transmission assembly 4 comprises: the brake device comprises a threaded cylinder 41, a first screw rod 42 and a transmission mechanism, wherein one end of the first screw rod 42 is connected with the inside of the threaded cylinder 41 in a threaded manner, and the other end of the first screw rod 42 is connected with a brake shoe 20; the transmission mechanism is connected with the threaded cylinder 41 and the electric control executing device 5, and is used for driving the threaded cylinder 41 to rotate under the driving of the electric control executing device 5, so that the first screw rod 42 drives the brake shoe 20 to abut against or loosen the brake drum 1.

In this embodiment, the electric control executing device 5 drives the transmission mechanism to work, and the transmission mechanism drives the screw thread cylinder 41 to rotate. When the screw tube 41 rotates forwards, the first screw rod 42 is screwed out of the screw tube 41, so that the brake shoe 20 is driven to abut against the brake drum 1; when the screw cylinder 41 rotates in the reverse direction, the first screw 42 moves into the screw cylinder 41, and thereby drives the brake shoe 20 to release the brake drum 1.

Wherein, the drive mechanism includes: a pull rod 40 and a nut 44, wherein the pull rod 40 is in transmission connection with the threaded cylinder 41; one end of the nut 44 is connected with the electric control executing device 5, and the other end of the nut is driven to rotate downwards by the pull rod 40 so as to drive the pull rod 40 to stretch along a straight line.

When the electric control executing device 5 executes braking operation, the electric control executing device drives the nut 44 to rotate, so that the pull rod 40 is pushed to move to the side far away from the electric control executing device 5, the threaded cylinder 41 rotates positively, the first screw rod 42 is screwed out, and the brake shoe 20 is pushed to be attached to the brake drum 1, so that braking is realized. When the brake is released, the electric control executing device 5 executes a brake release operation, which drives the nut 44 to rotate, pulls the pull rod 40 to move to the side close to the electric control executing device 5, and thus the first screw rod 42 is screwed into the threaded cylinder 41, and further drives the brake shoe 20 to be separated from the brake drum 1, so that the brake is released. The electric control executing device 5 comprises a first motor 50, and the first motor 50 is connected with the nut 44 in the transmission assembly 4. The electric control executing device 5 further comprises a first gearbox 52, and the first motor 50 is connected with the transmission assembly 4 through the first gearbox 52. Accordingly, the first motor 50 drives the first main shaft 51, and the first main shaft is transmitted to the first output shaft 53 after being decelerated and torque-increased by the first transmission 52, the first output shaft 53 is connected to the nut 44, the nut 44 is axially restrained, the tie rod 40 is screwed thereto, and the tie rod 40 is circumferentially restrained. The nut 44 is connected to the tie rod 40 by a ball screw pair. The first screw 42 rotates in the forward and reverse directions to horizontally move the pull rod 40, thereby applying or releasing the brake.

When the first motor 50 is not rotating, the pull rod 40 can still move at this time. For example, when a parking brake is applied, the lever 40 is forced to move, and since the nut 44 is axially restrained, forced rotation of the nut 44 occurs, thereby moving the lever 40.

In the transmission connection of the pull rod 40 and the thread cylinder 41, a thread groove is formed on the surface of the thread cylinder 41; the pull rod 40 includes: a stud and a toothed plate, the stud being in threaded connection with the nut 44; one end of the toothed plate is rotatably connected with the stud, and the toothed plate is in transmission connection with the thread cylinder 41 through a thread groove.

Therefore, when the nut 44 rotates, the stud moves axially along the nut 44, and the toothed plate is pushed to move, and when the toothed plate moves, the threaded cylinder 41 is driven to rotate.

In this embodiment, the EPB (Electrical ParkBrake electronic parking brake system) actuator is connected to the tie rod 40 and, in turn, indirectly to the brake shoe 20. The EPB executing device 8 is used for controlling the transmission assembly 4 according to the control command of the brake executing unit 7 so as to drive the brake shoe 20 to abut against or loosen the brake drum 1.

During service braking: the brake actuating unit 7 receives a service brake request, and when the brake actuating unit 7 receives the service brake request, the brake actuating unit 7 sends a control instruction to the electric control actuating device 5. When the electric control executing device 5 executes braking operation, the pull rod 40 is pushed to move to the side far away from the electric control executing device 5, the threaded cylinder 41 rotates positively, so that the first screw rod 42 is screwed out, and the friction surface of the brake shoe 20 is pushed to be attached to the friction plate on the brake drum 1, so that braking is realized. When the brake is released, the electric control actuator 5 performs a brake release operation, which pulls the pull rod 40 to move to the side close to the electric control actuator 5, thereby screwing the first screw 42, and further, driving the friction surface of the brake shoe 20 to separate from the brake drum 1, thereby releasing the brake. By continuously adjusting the release and release of the electric control actuator 5, ABS (antilock braking system) and other functions can be realized.

At the time of parking braking: the brake actuating unit 7 receives the parking brake request, and when the brake actuating unit 7 receives the parking brake request, the brake actuating unit 7 sends a control instruction to the EPB actuating device 8. The EPB actuating device 8 pulls the pull rod 40 to move to the side far away from the electric control actuating device 5, and drives the threaded cylinder 41 to rotate forward, so that the first screw rod 42 is screwed out, and the friction surface of the brake shoe 20 is pushed to be attached to the brake drum 1, so that braking is realized, and the current position is maintained. When the brake is released, the EPB actuator 8 drives the brake shoe 20 back.

Wherein, the brake drum 1 forms an installation space inside; the brake assembly 2 further comprises: the pin shaft 23 and the return spring 21, the pin shaft 23 is positioned in the installation space and is rotationally connected with the installation bottom plate 3, and the brake shoe 20 is hinged with the pin shaft 23; the return spring 21 is connected between the pin 23 and the brake shoe 20. Therefore, when the friction surface of the brake shoe 20 is brought into contact with the brake drum 1, the return spring 21 is elongated; when the friction surface of the brake shoe 20 is separated from the brake drum 1, the return spring 21 is restored. When the brake is released, the EPB actuator 8 releases the pull rod 40, and the brake shoe 20 is driven to return under the action of the return spring 21. Specifically, the EPB execution apparatus 8 includes: the second motor 80, the second screw rod 84, the screw sleeve 85 and the inhaul cable body 86, wherein the second screw rod 84 is connected with the second motor 80; the screw sleeve 85 is sleeved on the outer peripheral surface of the second screw rod 84 and is in threaded connection with the second screw rod 84; one end of the inhaul cable body 86 is connected with the threaded sleeve 85, and the other end of the inhaul cable body is connected with the brake shoe 20. Further, the EPB execution device 8 further includes: the second motor 80 is connected to the second screw 84 through the second gearbox 82. The EPB execution device 8 is based on the following principle: the second motor 80 drives the second main shaft 81, and the second main shaft is transmitted to the second output shaft 83 after being decelerated and torque-increased through the second gearbox 82, the second output shaft 83 is connected with the second screw 84, a screw sleeve 85 is screwed with the second output shaft, and the screw sleeve 85 is circumferentially limited. When the second screw 84 rotates in the forward and reverse directions, the nut 85 is moved, thereby pulling or releasing the cable body 86. Since the second screw rod 84 and the screw sleeve 85 belong to self-locking threads, the screw sleeve 85 cannot be moved by the stay rope body 86.

In order to make the cable body 86 more stable when moving, the EPB actuator 8 further includes a cable balancer 87, and the cable body 86 is disposed inside the cable balancer 87. Balance of the cable body 86 when moving can be ensured by the cable balancer 87.

Therefore, in the present embodiment, when the second motor 80 drives the second screw 84 to rotate, the threaded sleeve 85 is driven to move on the second screw 84, and the cable body 86 is driven to move. When the parking brake is performed, the pull rod 40 is pulled by the pull rope body 86 to move to the side far away from the electric control executing device 5; when the brake is released, the second motor 80 drives the second screw rod 84 and the screw sleeve 85 to loosen the inhaul cable body 86, and the brake shoe 20 is driven to return under the action of the return spring 21.

Further, in the present embodiment, the brake shoes 20 are provided with two; the two brake shoes 20 are symmetrically distributed on two sides of the pin 23 along the radial direction of the pin 23, and are hinged with the pin 23. Therefore, the first screw 42 is also provided with two screws, and is screwed to both sides of the screw cylinder 41.

The functions specifically described here are required: because the connection mode of the ball screw is adopted between the threaded cylinder 41 and the first screw rods 42, when the brake shoe 20 is reset, the two first screw rods 42 are pushed to be close to each other, and because the ball screw rods are not self-locking, the threaded cylinder 41 is reversely rotated under the driving of the two first screw rods 42, so that the whole device is restored to the position before brake application.

Similarly, the tie rod 40 is also connected to the nut 44 by a ball screw. Since the pull rod 40 is circumferentially defined, the horizontal movement of the pull rod 40 is also free, which horizontal movement will be translated into rotation of the nut 44.

During brake clearance compensation: as braking proceeds, the brake shoes 20 wear. So that the first screw 42 requires more unscrewing length. When the electric control executing device 5 brakes, the idle time is increased by a certain time; when the time length exceeds the standard value, a gap adjustment preparation state is entered. At this time, when the EPB actuator 8 completes one parking, it is determined that the stroke of the cable body 86 also exceeds the standard value Δand the exceeding value is Δ1, that is, the entire stroke is Δ++ Δ1; when the EPB actuator 8 is released, and still releases only the travel standard value delta of the cable body 86, the position of the pull rod 40 is moved by more than a value delta 1 from the previous position. Correspondingly, the extension length of the screwing part of the pull rod 40 and the nut 44 is increased, so that the braking gap is kept constant, further, the increase of the braking time or the reduction of the braking capability caused by the overlong braking gap is avoided, and the safety of the braking system is improved.

When pre-braking: when the vehicle detects the driver's intention to brake, for example, the driver releases the brake pedal, the pull rod 40 can be pulled by the EPB actuator 8 at this time so that the brake clearance is reduced and then kept at the current position. When a driver formally performs braking action, the electric control executing device 5 can rapidly perform braking, waiting time of the brake for eliminating a braking gap is shortened, braking response speed is improved, and safety of vehicle running is improved. Further, the electric control actuator 5 may be caused to pull the tie rod 40 to perform the pre-braking before the braking is performed formally.

In other possible embodiments, as shown in fig. 5, the transmission assembly 4 includes: the brake device comprises a threaded cylinder 41, a first screw rod 42 and a transmission mechanism, wherein one end of the first screw rod 42 is connected with the inside of the threaded cylinder 41 in a threaded manner, and the other end of the first screw rod 42 is connected with a brake shoe 20; the transmission mechanism is connected with the threaded cylinder 41 and the electric control executing device 5, and is used for driving the threaded cylinder 41 to rotate under the driving of the electric control executing device 5, so that the first screw rod 42 drives the brake shoe 20 to abut against or loosen the brake drum 1.

In the present embodiment, an EPB (Electrical Park Brake electronic parking brake system) actuator is connected to the brake shoe 20. The EPB executing device 8 is connected with the brake shoes 20, and the EPB executing device 8 is used for driving the brake shoes 20 to abut against or release the brake drum 1 according to a control command of the brake executing unit 7. Specifically, the EPB execution apparatus 8 includes: the second motor 80, the second screw rod 84, the screw sleeve 85 and the inhaul cable body 86, wherein the second screw rod 84 is connected with the second motor 80; the screw sleeve 85 is sleeved on the outer peripheral surface of the second screw rod 84 and is in threaded connection with the second screw rod 84; one end of the inhaul cable body 86 is connected with the threaded sleeve 85, and the other end of the inhaul cable body is connected with the brake shoe 20. Further, the EPB execution device 8 further includes: the second motor 80 is connected to the second screw 84 through the second gearbox 82. The EPB execution device 8 is based on the following principle: the second motor 80 drives the second main shaft 81, and the second main shaft is transmitted to the second output shaft 83 after being decelerated and torque-increased through the second gearbox 82, the second output shaft 83 is connected with the second screw 84, a screw sleeve 85 is screwed with the second output shaft, and the screw sleeve 85 is circumferentially limited. When the second screw 84 rotates in the forward and reverse directions, the nut 85 is moved, thereby pulling or releasing the cable body 86. Since the second screw rod 84 and the screw sleeve 85 belong to self-locking threads, the screw sleeve 85 cannot be moved by the stay rope body 86.

Wherein, the brake drum 1 forms an installation space inside; the brake assembly 2 further comprises: the brake shoe comprises a pin shaft 23, a return spring 21 and a connecting rod device 22, wherein the pin shaft 23 is positioned in an installation space, and two brake shoes 20 are symmetrically distributed on two sides of the pin shaft 23 along the radial direction of the pin shaft 23 and are hinged with the pin shaft 23; the return spring 21 is connected between the pin 23 and the brake shoe 20; the linkage 22 is hinged between the two brake shoes 20; wherein, when one brake shoe 20 is abutted with the brake drum 1, the linkage device 22 drives the other brake shoe 20 to be abutted with the brake drum 1, and when one brake shoe 20 is separated from the brake drum 1, the linkage device 22 drives the other brake shoe 20 to release the brake drum 1.

Wherein the linkage 22 comprises: a first link and a second link, one end of the first link being hinged to one brake shoe 20; the second connecting rod is vertically arranged between the two brake shoes 20, one end of the second connecting rod is hinged with the first connecting rod, an included angle is formed between the first connecting rod and the second connecting rod, and the other end of the second connecting rod is connected with the other brake shoe 20.

Therefore, when the cable body 86 drives the friction surface of the brake shoe 20 to be attached to the brake drum 1, the return spring 21 stretches, one end of the first connecting rod is lifted, the other end of the first connecting rod falls, and the falling end pushes the second connecting rod to move, so that the friction surface of the other brake shoe 20 is attached to the brake drum 1; when the friction surface of the brake shoe 20 is separated from the brake drum 1, the return spring 21 and the link device 22 are restored. When the brake is released, the EPB actuator 8 releases the brake shoe 20, and the brake shoe 20 is driven to return under the action of the return spring 21.

Therefore, in the present embodiment, when the second motor 80 drives the second screw 84 to rotate, the threaded sleeve 85 is driven to move on the second screw 84, and the cable body 86 is driven to move. When the parking brake is performed, the guy cable body 86 pulls the friction surface of the brake shoe 20 to be attached to the brake drum 1; when the brake is released, the second motor 80 drives the second screw rod 84 and the screw sleeve 85 to loosen the inhaul cable body 86, and the brake shoe 20 is driven to return under the action of the return spring 21.

In the present embodiment, since the brake shoes 20 are provided with two; the two brake shoes 20 are symmetrically distributed on two sides of the pin 23 along the radial direction of the pin 23, and are hinged with the pin 23. Therefore, the first screw 42 is also provided with two screws, and is screwed to both sides of the screw cylinder 41.

During service braking: the brake actuating unit 7 receives a service brake request, and when the brake actuating unit 7 receives the service brake request, the brake actuating unit 7 sends a control instruction to the electric control actuating device 5. When the electric control executing device 5 executes braking operation, the pull rod 40 is pushed to move to the side far away from the electric control executing device 5, the threaded cylinder 41 rotates positively, so that the first screw rod 42 is screwed out, and the friction surface of the brake shoe 20 is pushed to be attached to the friction plate on the brake drum 1, so that braking is realized. When the brake is released, the brake release operation is performed in the electric control actuator 5, which pulls the pull rod 40 to move to the side close to the electric control actuator 5, thereby screwing the first screw 42, and further, driving the friction surface of the brake shoe 20 to separate from the brake drum 1, thereby releasing the brake. By continuously adjusting the release and release of the electric control actuator 5, ABS (antilock braking system) and other functions can be realized.

At the time of parking braking: the brake actuating unit 7 receives the parking brake request, and when the brake actuating unit 7 receives the parking brake request, the brake actuating unit 7 sends a control instruction to the EPB actuating device 8. The EPB executing device 8 tightens the inhaul cable body 86 to drive the brake shoe 20 connected with the inhaul cable body to be tightly attached to the brake drum 1, and the brake shoe 20 drives the other brake shoe 20 to be tightly attached to the brake drum 1 by utilizing the fulcrum of the connecting rod device 22, so that braking is realized, the current position is maintained, and parking braking is realized. When the brake is released, the stay rope body 86 is released, and the brake shoe 20 is driven to return under the action of the return spring 21.

During brake clearance compensation: the gap compensation of the implementation is realized by a service brake function. When the braking exceeds the set braking clearance standard value for a certain time, the pull rod 40 moves more distances, but the set return distance is still the standard value, so that the braking clearance is reduced, the braking clearance is restored to the set standard braking clearance, and the clearance compensation is completed.

In still other possible embodiments, as shown in fig. 6, the transmission assembly 4 includes: the brake device comprises a threaded cylinder 41, a first screw rod 42 and a transmission mechanism, wherein one end of the first screw rod 42 is connected with the inside of the threaded cylinder 41 in a threaded manner, and the other end of the first screw rod 42 is connected with a brake shoe 20; the transmission mechanism is connected with the threaded cylinder 41 and the electric control executing device 5, and is used for driving the threaded cylinder 41 to rotate under the driving of the electric control executing device 5, so that the first screw rod 42 drives the brake shoe 20 to abut against or loosen the brake drum 1.

Wherein, the drive mechanism includes: a first gear 43 and a second gear 45, the first gear 43 being provided on the outer peripheral surface of the screw cylinder 41; the second gear 45 is connected to the electric control actuator 5, and the second gear 45 is meshed with the first gear 43.

When the electric control executing device 5 executes braking operation, the electric control executing device drives the second gear 45 to rotate, the first screw rod 42 is directly driven by the first gear 43, and the axial direction of the second gear 45 is parallel to the axial direction of the first screw rod 42, so that the structure and arrangement are more advantageous. When the brake is released, the electric control executing device 5 executes a brake release operation, which drives the second gear 45 and the first gear 43 to rotate, thereby screwing the first screw 42 into the screw tube 41, and further drives the brake shoe 20 to be separated from the brake drum 1, thereby releasing the brake. The electric control executing device 5 comprises a first motor 50, and the first motor 50 is connected with a second gear 45 in the transmission assembly 4. The electric control executing device 5 further comprises a first gearbox 52, and the first motor 50 is connected with the transmission assembly 4 through the first gearbox 52. Accordingly, the first motor 50 drives the first main shaft 51, and the first main shaft is transmitted to the first output shaft 53 after being decelerated and torque-increased by the first gearbox 52, the first output shaft 53 is connected to the second gear 45, and the second gear 45 is axially defined.

In the present embodiment, an EPB (Electrical Park Brake electronic parking brake system) actuator is connected to the brake shoe 20. The EPB executing device 8 is connected with the brake shoes 20, and the EPB executing device 8 is used for driving the brake shoes 20 to abut against or release the brake drum 1 according to a control command of the brake executing unit 7. Specifically, the EPB execution apparatus 8 includes: the second motor 80, the second screw rod 84, the screw sleeve 85 and the inhaul cable body 86, wherein the second screw rod 84 is connected with the second gear motor 80; the screw sleeve 85 is sleeved on the outer peripheral surface of the second screw rod 84 and is in threaded connection with the second screw rod 84; one end of the inhaul cable body 86 is connected with the threaded sleeve 85, and the other end of the inhaul cable body is connected with the brake shoe 20. Further, the EPB execution device 8 further includes: the second motor 80 is connected to the second screw 84 through the second gearbox 82. The EPB execution device 8 is based on the following principle: the second motor 80 drives the second main shaft 81, and the second main shaft is transmitted to the second output shaft 83 after being decelerated and torque-increased through the second gearbox 82, the second output shaft 83 is connected with the second screw 84, a screw sleeve 85 is screwed with the second output shaft, and the screw sleeve 85 is circumferentially limited. When the second screw 84 rotates in the forward and reverse directions, the nut 85 is moved, thereby pulling or releasing the cable body 86. Since the second screw rod 84 and the screw sleeve 85 belong to self-locking threads, the screw sleeve 85 cannot be moved by the stay rope body 86.

During service braking: the brake actuating unit 7 receives a service brake request, and when the brake actuating unit 7 receives the service brake request, the brake actuating unit 7 sends a control instruction to the electric control actuating device 5. When the electric control executing device 5 executes braking operation, it drives the first gear 43 and the second gear 45 to rotate, so that the thread pushing cylinder 41 rotates forward, and the first screw 42 is screwed out, so that the friction surface of the brake shoe 20 is pushed to be attached to the friction plate on the brake drum 1, and braking is achieved. When the brake is released, the electric control actuator 5 performs a brake release operation that rotates the push screw cylinder 41 in the opposite direction, thereby unscrewing the first screw 42, and thereby driving the friction surface of the brake shoe 20 to be separated from the brake drum 1, thereby releasing the brake. By continuously adjusting the release and release of the electric control actuator 5, ABS (antilock braking system) and other functions can be realized.

The above embodiments are merely a plurality of possible implementations of the embodiment of the present application, and the embodiment of the present application is not limited thereto.

In a second aspect, embodiments of the present application provide a brake system comprising: the drum brake and the brake actuating unit 7 provided by any one of the embodiments of the present application are electrically connected to the electric control actuating device 5 and the EPB actuating device 8, and are used for sending control instructions to the electric control actuating device 5 and/or the EPB actuating device 8.

Wherein the brake execution unit 7 is further configured to receive a service brake request and a parking brake request; when the brake execution unit 7 receives a service brake request, the brake execution unit 7 sends a control instruction to the electric control execution device 5; when the brake actuating unit 7 receives a parking brake request, the brake actuating unit 7 sends a control command to the EPB actuating device 8.

In some possible embodiments, as shown in fig. 3, the electrically controlled actuator 5 is controlled by the brake actuator 7 via an electrical line 88. The brake actuator 7 controls the electric control actuator 5 and the EPB actuator 8. Further, the EPB actuator of each brake drum 1 and wheel 6 may be independent, or one EPB actuator may control the brake drums 1 on a plurality of wheels 6.

Specifically, the EPB execution apparatus 8 includes: the second motor 80, the second screw rod 84, the screw sleeve 85 and the inhaul cable body 86, wherein the second screw rod 84 is connected with the second motor 80; the screw sleeve 85 is sleeved on the outer peripheral surface of the second screw rod 84 and is in threaded connection with the second screw rod 84; one end of the inhaul cable body 86 is connected with the threaded sleeve 85, and the other end of the inhaul cable body is connected with the brake shoe 20.

Further, the EPB executing apparatus 8 further includes a cable balancer 87, and the cable body 86 is disposed inside the cable balancer 87.

When one EPB actuator can also control a plurality of brake drums 1, the cable body 86 includes: a first cable and a second cable, the first cable being connected with the swivel 85; the second cable is arranged inside the cable balancer 87 in a penetrating way, the first cable is connected with the second cable, two ends of the second cable are both brake shoe connecting ends, and at this time, the two ends of the second cable can respectively control the brake shoes 20 on the two wheels 6. In addition, the cable body 86 may further include a third cable connected to the first cable, the third cable is inserted into the cable balancer 87, and one end is a brake shoe connection end, and at this time, the second cable cooperates with the third cable to respectively control the brake shoes 20 on the three wheels 6. On the basis of the method, a fourth inhaul cable, a fifth inhaul cable and the like can be further arranged, so that the EPB actuator can control the brake shoes 20 on different numbers of wheels 6 according to actual needs.

When the brake executing unit 7 receives a service brake request during service braking, the first motor 50 of the electric control executing device 5 is driven to rotate, so that the electric control executing device 5 is controlled to apply or release braking force.

When the brake executing unit 7 receives a parking brake request during parking braking, the second motor 80 driving the EPB executing device 8 pulls the cable body 86, thereby applying the brake; and otherwise, releasing the parking brake.

When the braking is degraded, emergency braking can be performed by the EPB actuator 8 when the electronically controlled actuator 5 fails or is not capable of being operated. Since the two are independent, safety redundancy is improved.

In other possible embodiments, the electrically controlled actuator 5 is provided as a caliper actuator.

In a third aspect, an embodiment of the present application provides a vehicle, including: the braking system provided by any one of the embodiments of the present application.

In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

It should be noted that in the present application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A drum brake, comprising:

a brake drum (1);

-a brake assembly (2), the brake assembly (2) comprising a brake shoe (20);

the transmission assembly (4) is connected with the brake shoe (20);

the electric control execution device (5) is connected with the transmission assembly (4) and used for controlling the transmission assembly (4) according to a control instruction of the brake execution unit (7) so as to drive the brake shoe (20) to abut against or loosen the brake drum (1);

and the EPB executing device (8) is connected with the brake shoe (20) and is used for driving the brake shoe (20) to abut against or release the brake drum (1) according to a control command of the brake executing unit (7).

2. Drum brake according to claim 1, characterized in that the transmission assembly (4) comprises:

a screw cylinder (41);

one end of the first screw rod (42) is in threaded connection with the inside of the threaded cylinder (41), and the other end of the first screw rod (42) is connected with the brake shoe (20);

the transmission mechanism is connected with the threaded cylinder (41) and the electric control execution device (5) and is used for driving the threaded cylinder (41) to rotate under the driving of the electric control execution device (5) so that the first screw rod (42) drives the brake shoe (20) to abut against or loosen the brake drum (1).

3. A drum brake according to claim 2, wherein the transmission mechanism comprises:

the pull rod (40) is in transmission connection with the threaded cylinder (41);

and one end of the nut (54) is connected with the electric control executing device (5), and the other end of the nut (54) is in threaded connection with the pull rod (40) and is used for rotating under the driving of the electric control executing device (5) so as to drive the pull rod (40) to stretch along a straight line.

4. A drum brake according to claim 3, wherein:

a thread groove is formed in the surface of the thread cylinder (41);

the tie rod (40) comprises:

the stud is in threaded connection with the nut (54);

and one end of the toothed plate is fixedly connected with the stud, and the toothed plate is in transmission connection with the thread cylinder (41) through a thread groove.

5. A drum brake according to claim 2, wherein the transmission mechanism comprises:

a first gear (43), wherein the first gear (43) is arranged on the outer peripheral surface of the thread cylinder (41);

and the second gear (55) is connected with the electric control executing device (5), and the second gear (55) is meshed with the first gear (43).

6. Drum brake according to claim 1, characterized in that the electrically controlled actuating means (5) comprise: and the first motor (50) is connected with the transmission assembly (4).

7. Drum brake according to claim 6, characterized in that the electrically controlled actuator (5) further comprises a first gearbox (52), the first motor (50) being connected to the transmission assembly (4) via the first gearbox (52).

8. Drum brake according to claim 1, characterized in that the EPB execution means (8) comprise:

a second motor (80);

a second screw (84), the second screw (84) being connected to a second motor (80);

the screw sleeve (85) is sleeved on the outer circumferential surface of the second screw rod (84), and is in threaded connection with the second screw rod (84);

and one end of the inhaul cable body (86) is connected with the threaded sleeve (85), and the other end of the inhaul cable body (86) is connected with the brake shoe (20).

9. Drum brake according to claim 8, characterized in that the EPB execution means (8) further comprise: and the second motor (80) is connected with a second screw (84) through the second gearbox (82).

10. The drum brake according to claim 8, wherein:

the EPB execution device (8) further comprises a guy rope balancer (87), and the guy rope body (86) is arranged inside the guy rope balancer (87) in a penetrating mode.

11. The drum brake according to claim 8, wherein:

The other end of the inhaul cable body (86) is connected with the transmission assembly (4), and the EPB executing device (8) is used for controlling the transmission assembly (4) according to a control instruction of the brake executing unit (7) so as to drive the brake shoe (20) to abut against or loosen the brake drum (1);

or the other end of the inhaul cable body (86) is connected with the brake shoe (20), and the EPB executing device (8) is used for driving the brake shoe (20) to abut against or loosen the brake drum (1) according to a control instruction of the brake executing unit (7).

12. A drum brake according to claim 1, wherein:

an installation space is formed inside the brake drum (1);

the brake assembly (2) further comprises:

the pin shaft (23), the pin shaft (23) is positioned in the installation space, and the brake shoe (20) is hinged with the pin shaft (23);

and the return spring (21) is connected between the pin shaft (23) and the brake shoe (20).

13. A drum brake according to claim 1, wherein:

an installation space is formed inside the brake drum (1), and two brake shoes (20) are arranged;

the brake assembly (2) further comprises:

the pin shafts (23), the pin shafts (23) are positioned in the installation space, and the two brake shoes (20) are symmetrically distributed on two sides of the pin shafts (23) along the radial direction of the pin shafts (23) and are hinged with the pin shafts (23);

A return spring (21), wherein the return spring (21) is connected between the pin shaft (23) and the brake shoe (20);

-a linkage (22), the linkage (22) being hinged between two brake shoes (20);

when one brake shoe (20) is abutted with the brake drum (1), the connecting rod device (22) drives the other brake shoe (20) to be abutted with the brake drum (1), and when one brake shoe (20) is separated from the brake drum (1), the connecting rod device (22) drives the other brake shoe (20) to release the brake drum (1).

14. Drum brake according to claim 13, characterized in that the linkage (22) comprises:

a first connecting rod, one end of which is hinged with one brake shoe (20);

the second connecting rod is vertically arranged between the two brake shoes (20), one end of the second connecting rod is hinged with the first connecting rod, an included angle is formed between the first connecting rod and the second connecting rod, and the other end of the second connecting rod is connected with the other brake shoe (20).

15. A drum brake according to claim 1, wherein:

the inner wall of the brake drum (1) is connected with a friction plate, the surface of the brake shoe (20) is a friction surface, and the friction surface is used for being attached to the friction plate.

16. A braking system, comprising:

A drum brake as claimed in any one of claims 1 to 15;

and the brake execution unit (7) is electrically connected with the electric control execution device (5) and the EPB execution device (8) and is used for sending control instructions to the electric control execution device (5) and/or the EPB execution device (8).

17. The brake system of claim 16, wherein:

the brake execution unit (7) is also used for receiving a service brake request and a parking brake request;

when the brake execution unit (7) receives a service brake request, the brake execution unit (7) sends a control instruction to the electric control execution device (5);

when the brake actuating unit (7) receives a parking brake request, the brake actuating unit (7) sends a control instruction to the EPB actuating device (8).

18. Braking system according to claim 16, characterized in that the EPB execution means (8) comprise:

a second motor (80);

19. The brake system of claim 18, wherein:

20. The brake system of claim 19, wherein the cable body (86) includes:

the first inhaul cable is connected with the screw sleeve (85);

the second cable is arranged inside the cable balancer (87) in a penetrating mode, the first cable is connected with the second cable, and two ends of the second cable are brake shoe connecting ends.

21. A vehicle, characterized in that it comprises: a braking system according to any one of claims 16 to 20.