Hydraulic power-assisted braking system, exhaust method thereof and vehicle

Abstract

The invention belongs to the technical field of vehicle braking and provides a hydraulic power-assisted braking system, an exhaust method of the hydraulic power-assisted braking system and a vehicle. The hydraulic power-assisted braking system comprises a power-assisted oil cylinder, a system oil unit, an axle braking unit and an exhaust oil inlet way, the power-assisted oil cylinder comprises a system oil working cavity and a braking oil working cavity, and the system oil unit comprises a power-assisted working oil way and a reversing control valve. The reversing control valve is connected between the power-assisted working oil way and the system oil working cavity and used for controlling oil feeding and returning of the system oil working cavity, the axle braking unit is connected with the braking oil working cavity through the first on-off control element, and the exhaust oil inlet way is connected between the axle braking unit and a pressure oil way of the power-assisted working oil way. And a second on-off control element is arranged on the exhaust oil inlet path. The exhaust debugging process of the system can be completed through one-man operation, the labor cost is reduced, and meanwhile operation is simpler.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle braking, and in particular relates to a hydraulic booster braking system and an exhaust method thereof, and a vehicle. Background Art

[0002] Engineering vehicles generally use hydraulic power-assisted braking systems to brake the axles. Existing hydraulic power-assisted braking systems generally include a brake pedal, a power-assisted pump, a power-assisted cylinder, and an axle brake oil circuit. The brake pedal is used to control the flow of oil output by the power-assisted pump to the power-assisted cylinder. When the operator steps on the brake pedal, the pressure oil output by the power-assisted pump will enter one of the working chambers of the power-assisted cylinder. The piston of the power-assisted cylinder moves, pushing the brake oil in the other working chamber into the axle brake oil circuit, and finally pushing the brake pads of the axle to brake. Among them, in order to ensure the movement stroke of the brake pads and avoid the brake pads from having empty travel, the axle brake oil circuit needs to be vented during vehicle debugging.

[0003] When exhausting the axle brake oil circuit, the existing hydraulic power-assisted braking system requires the cooperation of at least three people. One of them needs to step on the brake pedal repeatedly in the cab to control the power-assisted oil cylinder to push the brake oil into the axle brake oil circuit. Of the remaining two people, one needs to continuously supply oil to the axle brake oil circuit, and the other needs to observe the oil output of the exhaust port of the axle brake oil circuit, resulting in a large amount of manpower consumed in this debugging mode. Summary of the invention

[0004] In view of the above-mentioned defects or shortcomings, the present invention provides a hydraulic power-assisted braking system and an exhaust method and a vehicle thereof, aiming to solve the technical problem that the existing hydraulic power-assisted braking system exhaust debugging consumes a lot of manpower.

[0005] To achieve the above-mentioned purpose, the present invention provides a hydraulic power-assisted braking system, wherein the hydraulic power-assisted braking system includes a power-assisted oil cylinder, a system oil unit, an axle brake unit and an exhaust oil inlet circuit, one of the rod chamber and the rodless chamber of the power-assisted oil cylinder is a system oil working chamber, and the other is a brake oil working chamber, the system oil unit includes a power-assisted working oil circuit and a reversing control valve, the reversing control valve is connected between the power-assisted working oil circuit and the system oil working chamber and is used to control the oil inlet and return of the system oil working chamber, the axle brake unit is connected to the brake oil working chamber through a first on-off control element, the exhaust oil inlet circuit is connected between the axle brake unit and the pressure oil circuit of the power-assisted working oil circuit, and a second on-off control element is provided on the exhaust oil inlet circuit.

[0006] In an embodiment of the present invention, the power-assisting working oil circuit includes a pressure oil circuit and a return oil circuit. One side of the reversing control valve is connected to the pressure oil circuit and the return oil circuit, and the other side of the pipeline is connected to the system oil working chamber. The reversing control valve has a first valve position and a second valve position. The first valve position is configured to connect the pressure oil circuit and the system oil working chamber, and the second valve position is configured to connect the return oil circuit and the system oil working chamber.

[0007] In an embodiment of the present invention, the reversing control valve is provided with a first reversing end arranged near the first valve position and a second reversing end arranged near the second valve position. The hydraulic power-assisted braking system also includes a brake pedal, which is transmission-connected to the first reversing end. The brake pedal is used to control the reversing control valve to switch to the first valve position when stepped on. The second reversing end is provided with a reset drive structure.

[0008] In an embodiment of the present invention, the reversing control valve is a hydraulically controlled reversing valve, the second reversing end of the reversing control valve is a hydraulically controlled reversing end, and the reset drive structure includes a first reset drive oil circuit connected between the second reversing end and the pressure oil circuit.

[0009] In an embodiment of the present invention, the reset drive structure further includes a second reset drive oil circuit connected between the second reversing end and the system oil working chamber.

[0010] In an embodiment of the present invention, a return oil working chamber is further provided between the system oil working chamber and the brake oil working chamber. The return oil working chamber is isolated from the brake oil working chamber. The return oil working chamber is connected to the system oil working chamber through a damping hole, and the return oil working chamber is connected to the oil return circuit.

[0011] In an embodiment of the present invention, the hydraulic power-assisted braking system also includes a brake oil tank, a first pipeline is provided between the brake oil tank and the brake oil working chamber, a first one-way valve is provided on the first pipeline, and the first one-way valve is configured to be turned on when the brake oil flows from the brake oil tank to the brake oil working chamber and to be turned off in the reverse direction.

[0012] In an embodiment of the present invention, a second one-way valve is further provided on the first pipeline, and the second one-way valve is arranged closer to the brake oil pot than the first one-way valve. The hydraulic power-assisted braking system also includes a second pipeline, one end of which is connected to the first pipeline between the second one-way valve and the first one-way valve, and the other end is connected to the brake oil working chamber; wherein, the second one-way valve is provided with a controllable end, and the second one-way valve is configured to be turned on when the brake oil flows from the brake oil pot to the brake oil working chamber and to be turned off in the reverse direction, and the controllable end is transmission-connected to the piston of the power-assisted oil cylinder and is configured as follows: when the piston of the power-assisted oil cylinder moves toward the system oil working chamber, the second one-way valve is bidirectionally turned on.

[0013] To achieve the above object, the present invention further provides an exhaust method for a hydraulic booster brake system, the exhaust method for a hydraulic booster brake system comprising:

[0014] S100: providing the hydraulic power-assisted braking system described above;

[0015] S200: confirm that the hydraulic oil in the pressure oil circuit is high-pressure oil, confirm that the pressure oil circuit and the system oil working chamber are cut off, and confirm that the exhaust port of the axle brake unit is open;

[0016] S300: operate the first on-off control element and the second on-off control element to turn off the first on-off control element and turn on the second on-off control element.

[0017] To achieve the above object, the present invention further provides a vehicle, wherein the vehicle comprises the hydraulic power-assisted braking system described above.

[0018] Through the above technical solution, the hydraulic booster brake system provided by the embodiment of the present invention has the following beneficial effects:

[0019] When the hydraulic power-assisted brake system is working normally, it is necessary to keep the first on-off control element open and the second on-off control element open. By controlling the hydraulic oil in the pressure oil circuit to enter the system oil working chamber, the piston of the power-assisted oil cylinder can be pushed to move, thereby pushing the brake oil in the brake oil working chamber into the axle brake unit, and finally pushing the brake pad to operate to achieve braking. When the hydraulic power-assisted brake system needs to be exhausted, open the exhaust hole in the axle brake unit, and operate the first on-off control element and the second on-off control element to make the first on-off control element cut off and the second on-off control element turned on. By controlling the hydraulic oil in the pressure oil circuit to enter the axle brake unit directly from the exhaust oil inlet, the gas in the axle brake unit pipeline can be discharged from the exhaust hole. In summary, when the hydraulic power-assisted braking system in the present invention is conducting exhaust debugging, the operator only needs to open the exhaust hole in the axle brake unit, operate the first on-off control element and the second on-off control element to cut off the first on-off control element and turn on the second on-off control element, and then observe the oil output of the exhaust hole. The entire debugging process can be completed by a single person, which not only reduces labor costs, but also makes the operation simpler, the exhaust effect is better, and the time spent on exhaust is shorter.

[0020] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 is a connection diagram of a hydraulic power-assisted braking system according to an embodiment of the present invention;

[0023] Figure 24 is a flow chart of the steps of a ventilation method for a hydraulic power-assisted braking system according to an embodiment of the present invention.

[0024] Description of Reference Numerals

[0025] 1. Power-assisted oil cylinder; 11. System oil working chamber; 12. Brake oil working chamber; 13. Return oil working chamber; 21. Power-assisted working oil circuit; 211. Pressure oil circuit; 212. Return oil circuit; 22. Reversing control valve; 221. First reversing end; 222. Second reversing end; 223. First reset drive oil circuit; 224. Second reset drive oil circuit; 3. Brake pedal; 4. Axle brake unit; 41. First on-off control element; 5. Exhaust oil inlet circuit; 51. Second on-off control element; 61. Brake oil pot; 62. First pipeline; 63. First one-way valve; 64. Second pipeline; 65. Second one-way valve; 651. Controllable end; 7. Power-assisted pump. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0027] The hydraulic power-assisted braking system of the present invention will be described below with reference to the accompanying drawings.

[0028] like Figure 1 As shown, the hydraulic power-assisted braking system of the present invention includes a power-assisted oil cylinder 1 , a system oil unit, an axle brake unit 4 and an exhaust oil inlet line 5 .

[0029] One of the rod chamber and the rodless chamber of the power-assisting oil cylinder 1 is a system oil working chamber 11 , and the other is a brake oil working chamber 12 .

[0030] The system oil unit includes a power-assisting working oil circuit 21 and a reversing control valve 22 . The reversing control valve 22 is connected between the power-assisting working oil circuit 21 and the system oil working chamber 11 and is used to control the oil inlet and return of the system oil working chamber 11 .

[0031] The axle brake unit 4 is connected to the brake oil working chamber 12 via a first on / off control element 41 .

[0032] The exhaust oil inlet circuit 5 is connected between the axle brake unit 4 and the pressure oil circuit 211 of the power-assisted working oil circuit, and a second on-off control element 51 is provided on the exhaust oil inlet circuit.

[0033] When the hydraulic booster brake system works normally, it is necessary to keep the first on-off control element 41 open and the second on-off control element 51 open. By controlling the hydraulic oil in the pressure oil circuit 211 to enter the system oil working chamber 11, the piston of the booster oil cylinder 1 can be pushed to move, thereby pushing the brake oil in the brake oil working chamber 12 into the axle brake unit 4, and finally pushing the brake pad to move to achieve braking.

[0034] When the hydraulic power-assisted brake system needs to be exhausted, the exhaust hole in the axle brake unit 4 is opened, and the first on-off control element 41 and the second on-off control element 51 are operated to cut off the first on-off control element 41 and turn on the second on-off control element 51. By controlling the hydraulic oil of the pressure oil circuit 211 to directly enter the axle brake unit 4 from the exhaust oil inlet circuit 5, the gas in the pipeline of the axle brake unit 4 can be discharged from the exhaust hole.

[0035] In summary, when the hydraulic power-assisted braking system in the present invention is conducting exhaust debugging, the operator only needs to open the exhaust hole in the axle brake unit 4, operate the first on-off control element 41 and the second on-off control element 51, so that the first on-off control element 41 is cut off and the second on-off control element 51 is turned on, and then observe the oil output of the exhaust hole. The entire debugging process can be completed by a single person, which not only reduces labor costs, but also makes the operation simpler, the exhaust effect is better, and the time spent on exhaust is shorter.

[0036] It can be understood that, in the embodiment of the present invention, the brake oil and the system oil are the same oil.

[0037] In the embodiment of the present invention, the first on-off control element 41 and the second on-off control element 51 can be a manual ball valve, a manual stop valve, or an electromagnetic reversing stop valve, etc., which are used to control the on-off of the corresponding pipeline.

[0038] like Figure 1 As shown, in an embodiment of the present invention, the power-assisting working oil circuit 21 includes a pressure oil circuit 211 and an oil return circuit 212. One side of the reversing control valve 22 is connected to the pressure oil circuit 211 and the oil return circuit 212, and the other side of the pipeline is connected to the system oil working chamber 11. The reversing control valve 22 has a first valve position and a second valve position. The first valve position is configured to connect the pressure oil circuit 211 and the system oil working chamber 11, and the second valve position is configured to connect the oil return circuit 212 and the system oil working chamber 11.

[0039] Specifically, the system oil working chamber 11 is taken as an example of the rodless chamber of the power-boosting cylinder 1. One end of the pressure oil circuit 211 is connected to the power-boosting pump 7, and the other end is connected to the reversing control valve 22. The reversing control valve 22 is used to guide the hydraulic oil of the pressure oil circuit 211 to the rodless chamber of the power-boosting cylinder 1 when in the first valve position, and to return oil to the rodless chamber of the power-boosting cylinder 1 for pressure relief when in the second valve position. The reversing control valve 22 is normally kept in the second valve position. When the operator performs the brake operation, the reversing control valve 22 will switch from the second valve position to the first valve position. At this time, the hydraulic oil of the pressure oil circuit 211 will enter the rodless chamber of the power-boosting cylinder 1, thereby pushing the piston of the power-boosting cylinder 1 to move toward the head end. The movement of the piston will push the brake oil in the brake oil working chamber 12 into the axle brake unit 4, thereby driving the brake pad to brake. Of course, the system oil working chamber 11 can also be a rod chamber of the power-boosting cylinder 1.

[0040] like Figure 1 As shown, in an embodiment of the present invention, the reversing control valve 22 is provided with a first reversing end 221 arranged near the first valve position and a second reversing end 222 arranged near the second valve position, and the hydraulic power-assisted braking system further comprises a brake pedal 3, the brake pedal 3 is transmission-connected with the first reversing end 221, the brake pedal 3 is used to control the reversing control valve 22 to switch to the first valve position when stepped on, and the second reversing end 222 is provided with a reset drive structure. By setting the reset drive structure, the reversing control valve 22 can be kept in the second valve position under normal conditions. When the operator performs the braking operation, he generally steps on the brake pedal 3. In order to realize the switching of the reversing control valve 22 from the second valve position to the first valve position when performing the braking operation, the brake pedal 3 can be transmission-connected with the first reversing end 221. The valve core of the reversing control valve 22 is pushed to move by the brake pedal 3 to realize the valve position switching control of the reversing control valve 22.

[0041] Of course, in some vehicles, the operator's braking operation is to operate the brake handle, and at this time the brake handle can be transmission-connected to the first reversing end 221 .

[0042] In an embodiment of the present invention, an electromagnet may be further provided on the first reversing end 221 , and when the brake pedal 3 is stepped on, the reversing control of the reversing control valve 22 may be realized through the cooperation of the sensing element and the controller.

[0043] like Figure 1 As shown, in an embodiment of the present invention, the reversing control valve 22 can be a hydraulically controlled reversing valve, the second reversing end 222 of the reversing control valve 22 is a hydraulically controlled reversing end, and the reset drive structure includes a first reset drive oil circuit 223 connected between the second reversing end 222 and the pressure oil circuit 211.

[0044] When the vehicle is driving, the power pump 7 is always in operation, and the pressure oil circuit 211 is always at high pressure. By connecting the first reset drive oil circuit 223 between the second reversing end 222 and the pressure oil circuit 211, it can ensure that the reversing control valve 22 is normally maintained in the second valve position.

[0045] Of course, in the embodiment of the present invention, a spring may be provided at the second reversing end 222 to realize the function of the reversing control valve 22 being kept at the second valve position under normal conditions.

[0046] like Figure 1 As shown, in the embodiment of the present invention, a return spring is provided at one end of the piston of the booster oil cylinder 1 close to the brake oil working chamber 12, and the return spring is used to push the piston of the booster oil cylinder 1 back. For example, when the system oil working chamber 11 is a rodless chamber of the booster oil cylinder 1, the return spring is used to push the piston to move in the direction of the rodless chamber. When the reversing control valve is switched to the second valve position, the system oil working chamber 11 is depressurized, and the return spring will push the piston of the booster oil cylinder 1 back. At this time, the brake oil of the axle brake unit 4 will be actively sucked into the brake oil working chamber 12, the axle brake unit 4 is depressurized, and the brake pad releases the brake on the axle.

[0047] like Figure 1 As shown, in an embodiment of the present invention, the reset drive structure also includes a second reset drive oil circuit 224 connected between the second reversing end 222 and the system oil working chamber 11. When the operator releases the brake pedal 3, under the action of the reset spring, the piston of the booster oil cylinder 1 will move toward the system oil working chamber 11, and the oil pressure in the system oil working chamber will increase, which will act on the second reversing end 222 through the second reset drive oil circuit 224. By cooperating with the first reset drive oil circuit 223, the rate at which the reversing control valve 22 is reset to the second valve position can be accelerated. When the reversing control valve 22 is switched to the second valve position, the system oil working chamber 11 is connected to the return oil circuit 212, and the system oil working chamber 11 is depressurized. Under the action of the reset spring, the booster oil cylinder 1 can quickly return to its position. That is, by setting the second reset drive oil circuit 224, the response speed of the booster oil cylinder 1 can be accelerated.

[0048] like Figure 1 As shown, in an embodiment of the present invention, a return oil working chamber 13 is further provided between the system oil working chamber 11 and the brake oil working chamber 12. The return oil working chamber 13 is isolated from the brake oil working chamber 12. The return oil working chamber 13 is connected to the system oil working chamber 11 through a damping hole, and the return oil working chamber 13 is connected to the return oil circuit 212.

[0049] By providing the oil return working chamber 13, when the piston moves to the maximum stroke in the direction of the brake oil working chamber 12, the pressure oil in the system oil working chamber 11 can enter the oil return working chamber 13 through the damping hole to release the pressure, thereby preventing the system oil working chamber 11 of the booster oil cylinder 1 from being continuously pressurized and causing damage to the oil cylinder or booster pump 7. At the same time, the provision of the damping hole can also ensure that a certain pressure is maintained in the system oil working chamber 11 when the piston just begins to retreat, so that the system oil working chamber 11 has enough pressure to act on the second reversing end 222 of the reversing control valve 22, thereby achieving the purpose of accelerating the resetting rate of the reversing control valve 22.

[0050] like Figure 1 As shown, in an embodiment of the present invention, the hydraulic power-assisted braking system also includes a brake oil tank 61, a first pipeline 62 is provided between the brake oil tank 61 and the brake oil working chamber 12, a first one-way valve 63 is provided on the first pipeline 62, and the first one-way valve 63 is configured to be conductive when the brake oil flows from the brake oil tank 61 to the brake oil working chamber 12 and to be blocked in the reverse direction.

[0051] Since the brake oil of the axle brake unit 4 is lost during use, by providing the brake oil pot 61, the brake oil can be added to the brake oil working chamber 12 when the axle brake unit 4 or the brake oil working chamber 12 is insufficient. By providing the first one-way valve 63, when the piston pushes the brake oil in the brake oil working chamber 12 into the axle brake unit 4, it is prevented that the brake oil flows into the brake oil pot 61, resulting in a lack of oil in the axle brake unit 4.

[0052] like Figure 1 As shown, in an embodiment of the present invention, a second one-way valve 65 is further provided on the first pipeline 62, and the second one-way valve 65 is arranged closer to the brake oil pot 61 than the first one-way valve 63, and the hydraulic power-assisted braking system also includes a second pipeline 64, one end of the second pipeline 64 is connected to the first pipeline 62 between the second one-way valve 65 and the first one-way valve 63, and the other end is connected to the brake oil working chamber 12; wherein, the second one-way valve 65 is provided with a controllable end 651, and the second one-way valve 65 is configured to be turned on when the brake oil flows from the brake oil pot 61 to the brake oil working chamber 12 and to be turned off in the reverse direction, and the controllable end 651 is connected to the piston of the power-assisted oil cylinder 1 in a transmission connection and is configured as follows: when the piston of the power-assisted oil cylinder 1 moves toward the system oil working chamber 11, the second one-way valve 65 is turned on in both directions.

[0053] After the operator releases the brake pedal 3, the piston will retreat under the action of the return spring, and the return of the brake pad will drive the brake oil in the axle brake unit 4 to actively enter the brake oil working chamber 12. If the flow of brake oil from the axle brake unit 4 into the brake oil working chamber 12 per unit time is too much, the excess brake oil can enter the brake oil pot 61 through the second pipeline 64 and the second one-way valve 65 to maintain the oil balance between the brake oil working chamber and the axle brake unit 4. When the oil in the brake oil working chamber 12 or the axle brake unit 4 is too little, the brake oil pot 61 can replenish the brake oil working chamber 12 through the first pipeline 62 and the second pipeline 64.

[0054] It should be explained that existing brake pads are generally provided with reset elements such as springs. After the brakes are released, the reset elements will drive the brake pads to reset actively.

[0055] like Figure 2 As shown, in order to achieve the above-mentioned purpose, the present invention also provides an exhaust method for a hydraulic booster brake system, and the exhaust method for a hydraulic booster brake system comprises:

[0056] S100: providing the hydraulic power-assisted braking system described above;

[0057] S200: confirming that the hydraulic oil in the pressure oil circuit 211 is high-pressure oil, confirming that the pressure oil circuit 211 is cut off from the system oil working chamber 11, and confirming that the exhaust port of the axle brake unit 4 is open;

[0058] S300 : Operate the first on-off control element 41 and the second on-off control element 51 to turn off the first on-off control element 41 and turn on the second on-off control element 51 .

[0059] Confirming that the hydraulic oil in the pressure oil circuit 211 is high-pressure oil generally means confirming that the power-assisting pump 7 is in operation, and confirming that the pressure oil circuit 211 and the system oil working chamber 11 are cut off means confirming that the reversing control valve 22 is in the second valve position.

[0060] Whether the hydraulic oil in the pressure oil circuit 211 is high-pressure oil, whether the pressure oil circuit 211 and the system oil working chamber 11 are cut off, and whether the exhaust port of the axle brake unit 4 is open can be confirmed by manual inspection or by detection and confirmation through sensing elements. When the inspection result shows that the hydraulic oil in the pressure oil circuit 211 is low-pressure oil, or the pressure oil circuit 211 and the system oil working chamber 11 are in a non-cutoff state, or the exhaust port of the axle brake unit 4 is in a closed state, the corresponding elements can be operated manually or by a controller to meet the prerequisites that need to be met before exhausting as defined in step S200.

[0061] When performing the exhaust operation, the first on-off control element 41 and the second on-off control element 51 are operated to turn off the first on-off control element 41 and turn on the second on-off control element 51. At this time, the hydraulic oil in the pressure oil circuit 211 can directly enter the axle brake unit 4 from the exhaust oil inlet circuit 5 and squeeze the gas in the pipeline out of the exhaust hole. When the exhaust hole has uniform oil flow out, it means that the exhaust is completed. At this time, the exhaust hole is closed, the first on-off control element 41 is opened, and the second on-off control element 51 is disconnected in sequence, so that the hydraulic booster brake system can be switched to a normal working state.

[0062] When performing exhaust debugging according to the present method, the operator only needs to switch the states of the first on-off control element 41 and the second on-off control element 51 first, and then observe the oil output of the exhaust hole. The entire debugging process can be completed by a single person, and compared with the existing method of pressing the brake oil into the axle brake unit 4 by the power cylinder 1, it can ensure that the hydraulic oil completely fills the axle brake unit 4, and the exhaust process is more thorough and the operation is simpler.

[0063] To achieve the above object, the present invention further provides a vehicle, wherein the vehicle includes the hydraulic booster brake system described above. The vehicle may be a special vehicle, such as an aerial work vehicle, or an ordinary vehicle. Since the vehicle adopts all the technical solutions of the above embodiments, it at least has the beneficial effects brought by the above embodiments, which will not be repeated here.

[0064] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 invention. In this specification, the schematic representations 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 one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0067] Although the embodiments of the present invention have been described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A hydraulic booster brake system, characterized in that: The hydraulic booster brake system comprises: A booster oil cylinder (1), wherein one of the rod chamber and the rodless chamber of the booster oil cylinder (1) is a system oil working chamber (11), and the other is a brake oil working chamber (12); The system oil unit comprises a booster working oil circuit (21) and a reversing control valve (22), wherein the reversing control valve (22) is connected between the booster working oil circuit (21) and the system oil working chamber (11) and is used to control the oil inlet and return of the system oil working chamber (11); An axle brake unit (4) is connected to the brake oil working chamber (12) via a first on-off control element (41); The exhaust oil inlet circuit (5) is connected between the axle brake unit (4) and the pressure oil circuit (211) of the booster working oil circuit (21), and a second on-off control element (51) is provided on the exhaust oil inlet circuit (5).

2. The hydraulic booster brake system according to claim 1, characterized in that: The power-assisting working oil circuit (21) comprises the pressure oil circuit (211) and the return oil circuit (212); one side of the reversing control valve (22) is connected to the pressure oil circuit (211) and the return oil circuit (212); the other side of the reversing control valve (22) is connected to the system oil working chamber (11); the reversing control valve (22) has a first valve position and a second valve position; the first valve position is configured so that the pressure oil circuit (211) and the system oil working chamber (11) are in communication; the second valve position is configured so that the return oil circuit (212) and the system oil working chamber (11) are in communication.

3. The hydraulic booster brake system according to claim 2, characterized in that: The reversing control valve (22) is provided with a first reversing end (221) arranged close to the first valve position and a second reversing end (222) arranged close to the second valve position. The hydraulic power-assisted braking system further comprises a brake pedal (3), the brake pedal (3) being transmission-connected to the first reversing end (221), the brake pedal (3) being used to control the reversing control valve (22) to switch to the first valve position when stepped on, and the second reversing end (222) being provided with a reset drive structure.

4. The hydraulic booster brake system according to claim 3, characterized in that: The reversing control valve (22) is a hydraulically controlled reversing valve, the second reversing end (222) of the reversing control valve (22) is a hydraulically controlled reversing end, and the reset drive structure comprises a first reset drive oil circuit (223) connected between the second reversing end (222) and the pressure oil circuit (211).

5. The hydraulic booster brake system according to claim 4, characterized in that: The reset drive structure further comprises a second reset drive oil circuit (224) connected between the second reversing end (222) and the system oil working chamber (11).

6. The hydraulic booster brake system according to claim 1, characterized in that: An oil return working chamber (13) is also provided between the system oil working chamber (11) and the brake oil working chamber (12); the oil return working chamber (13) is isolated from the brake oil working chamber (12); the oil return working chamber (13) and the system oil working chamber (11) are connected via a damping hole; the oil return working chamber (13) is connected to the oil return circuit (212) of the power assist working oil circuit (21).

7. The hydraulic booster brake system according to any one of claims 1 to 6, characterized in that: The hydraulic power-assisted braking system further comprises a brake oil pot (61), a first pipeline (62) being provided between the brake oil pot (61) and the brake oil working chamber (12), a first one-way valve (63) being provided on the first pipeline (62), and the first one-way valve (63) being configured to be conductive when the brake oil flows from the brake oil pot (61) to the brake oil working chamber (12) and to be blocked in the reverse direction.

8. The hydraulic booster brake system according to claim 7, characterized in that: A second one-way valve (65) is also provided on the first pipeline (62), and the second one-way valve (65) is arranged closer to the brake oil pot (61) than the first one-way valve (63). The hydraulic booster brake system also includes a second pipeline (64), one end of the second pipeline (64) is connected to the first pipeline (62) between the second one-way valve (65) and the first one-way valve (63), and the other end is connected to the brake oil working chamber (12); The second one-way valve (65) is provided with a controllable end (651), and the second one-way valve (65) is configured to be turned on when the brake oil flows from the brake oil tank (61) to the brake oil working chamber (12) and to be turned off in the reverse direction. The controllable end (651) is connected to the piston of the boosting oil cylinder (1) and is configured such that when the piston of the boosting oil cylinder (1) moves toward the system oil working chamber (11), the second one-way valve (65) is turned on in both directions.

9. A method for exhausting a hydraulic booster brake system, characterized in that: The exhaust method of the hydraulic booster brake system comprises: Providing a hydraulic booster brake system according to any one of claims 1 to 8; Confirming that the hydraulic oil in the pressure oil circuit (211) is high-pressure oil, confirming that the pressure oil circuit (211) is cut off from the system oil working chamber (11), and confirming that the exhaust port of the axle brake unit (4) is open; The first on-off control element (41) and the second on-off control element (51) are operated so that the first on-off control element (41) is turned off and the second on-off control element (51) is turned on.

10. A vehicle, characterized in that: A hydraulic power-assisted braking system comprising any one of claims 1 to 8.

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