Hydraulic brake device

Abstract

The hydraulic brake device comprises a brake oil circuit, a hydraulic pump arranged on the brake oil circuit and used for providing power to oil in the brake oil circuit, a control valve assembly arranged on the brake oil circuit and capable of controlling a flow direction of the oil in the brake oil circuit, a parking brake and an auxiliary brake respectively communicated with the brake oil circuit, the parking brake and the auxiliary brake are capable of parking operation, the parking brake and the auxiliary brake are simultaneously in a braking mode or a release mode, when in the braking mode, one of the parking brake and the auxiliary brake is in an oil injection state and the other is in an oil return state. According to the technical scheme provided by the application, the problem of poor braking effect of the hydraulic brake device in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of braking device, in particular to a hydraulic braking device. BACKGROUND

[0002] At present, in the braking system of the trackless auxiliary transport vehicle in the mine, the hydraulic braking device is usually used to control the braking of the vehicle, and the hydraulic braking device is usually divided into oil feeding type brake and oil cutting type brake to adapt to the braking needs of different types of vehicles.

[0003] The hydraulic braking device in the prior art comprises a braking oil path, a control valve assembly arranged on the braking oil path and a parking brake, in the oil feeding type braking, the control valve assembly controls the oil liquid to flow into the parking brake to realize the pressurization of the parking brake to drive the parking brake to rub with the friction drum to force the wheel to stop rotating to realize parking, and in the oil cutting type braking, the control valve assembly controls the oil liquid to flow out of the parking brake to drive the parking brake to rub with the friction drum to force the wheel to stop rotating to realize parking in cooperation with the elastic device. However, the hydraulic braking device in the prior art can only be applied to the oil feeding type braking or the oil cutting type braking, and cannot be applied to different types of braking systems, and the trackless auxiliary transport vehicle working in the coal mine has large overall load, which increases the friction force of the existing trackless auxiliary transport vehicle, the friction force of the existing hydraulic braking device to the friction drum is small, and the braking distance of the trackless auxiliary transport vehicle is increased, and the braking effect is poor. SUMMARY

[0004] The present application provides a hydraulic braking device to solve the problem of poor braking effect of the hydraulic braking device in the prior art.

[0005] The present application provides a hydraulic braking device, which comprises a braking oil path, a hydraulic pump arranged on the braking oil path and used to provide power for the oil liquid in the braking oil path, a control valve assembly arranged on the braking oil path, the control valve assembly being capable of controlling the flow direction of the oil liquid in the braking oil path, and a parking brake and an auxiliary brake communicated with the braking oil path respectively, the parking brake and the auxiliary brake both being capable of parking operation, the parking brake and the auxiliary brake being in a braking mode or a release mode at the same time, when in the braking mode, one of the parking brake and the auxiliary brake is in an oil injection state, and the other is in an oil return state.

[0006] Further, the brake oil circuit comprises a main oil circuit, a first branch oil circuit, a second branch oil circuit, a first return oil circuit and a second return oil circuit, the hydraulic pump is arranged on the main oil circuit, the first branch oil circuit and the second branch oil circuit are both in communication with the main oil circuit, the hydraulic brake device further comprises an oil tank, the first return oil circuit and the second return oil circuit are both in communication with the oil tank; the control valve assembly comprises a parking brake valve and a service brake valve, the parking brake valve is arranged on the first branch oil circuit, the parking brake valve has a first communication port, a second communication port and a first return port, the second communication port is selectively in communication with the first communication port or the first return port, the first communication port is in communication with the main oil circuit, the second communication port is in communication with the auxiliary brake, and the first return port is in communication with the first return oil circuit; the service brake valve is arranged on the second branch oil circuit, the service brake valve has a third communication port, a fourth communication port and a second return port, the fourth communication port is selectively in communication with the third communication port or the second return port, the third communication port is in communication with the main oil circuit, the fourth communication port is in communication with the parking brake, and the second return port is in communication with the second return oil circuit; when the parking brake is in an oil injection state, the third communication port and the fourth communication port are in communication, the oil flows from the main oil circuit to the parking brake through the second branch oil circuit under the drive of the hydraulic pump, the second communication port is in communication with the first return port, and the oil in the auxiliary brake flows to the oil tank through the first return oil circuit; when the parking brake is in a return oil state, the fourth communication port is in communication with the second return port, the oil in the parking brake flows to the oil tank from the second return oil circuit, the first communication port and the second communication port are in communication, and the oil flows from the main oil circuit to the auxiliary brake through the first branch oil circuit under the drive of the hydraulic pump.

[0007] Further, the hydraulic brake device further comprises a manual drive assembly, the manual drive assembly is arranged on the brake oil circuit, the manual drive assembly is connected with the parking brake, and the manual drive assembly can perform an oil injection operation on the parking brake.

[0008] Further, the manual drive assembly comprises a manual pressure pump and a manual control valve, the manual control valve is arranged on the brake oil circuit, the manual control valve has a fifth communication port, a sixth communication port and a seventh communication port, the fifth communication port is in communication with the second communication port, the sixth communication port is in communication with the third communication port, the brake oil circuit further comprises a third branch pipeline, the third branch pipeline is in communication with the oil tank, the seventh communication port is in communication with the third branch pipeline, the manual control valve can be switched manually to make the sixth communication port in communication with the fifth communication port or the seventh communication port, and the manual pressure pump is arranged on the third branch pipeline and can drive the oil to flow to the parking brake through the manual control valve.

[0009] Further, the hydraulic brake device has a first one-way valve, the first one-way valve is arranged on the third branch pipeline, and the first one-way valve is used to prevent the oil from flowing to the oil tank through the manual control valve.

[0010] Further, the hydraulic brake device further comprises a brake accumulator, the brake accumulator is connected with the main oil circuit, and the brake accumulator is used for adjusting the pressure of the oil in the brake oil circuit.

[0011] Further, the hydraulic brake device further comprises a safety valve and a third return oil circuit, the safety valve is arranged on the third return oil circuit, and the third return oil circuit is respectively communicated with the oil tank and the main oil circuit.

[0012] Further, the hydraulic brake device further comprises a stop valve and a fourth return oil circuit, the stop valve is arranged on the fourth return oil circuit, the fourth return oil circuit is respectively communicated with the main oil circuit and the oil tank, and the connection position of the fourth return oil circuit and the main oil circuit is located upstream of the parking control valve and the service brake valve.

[0013] Further, the hydraulic brake device further comprises a second one-way valve, the second one-way valve is arranged on the main oil circuit and located upstream of the parking control valve and the service brake valve.

[0014] Further, the hydraulic brake device further comprises a liquid temperature sensor, the liquid temperature sensor is arranged on the oil tank, and the liquid temperature sensor is used for detecting the temperature of the oil in the oil tank.

[0015] By applying the technical scheme of the present application, the hydraulic brake device comprises a brake oil circuit, a hydraulic pump, a control valve assembly, a parking brake and an auxiliary brake, the hydraulic pump can drive the oil to circulate in the brake oil circuit through siphon action, the parking brake can clamp a friction drum of the trackless auxiliary transport vehicle to realize braking or unbraking, and the auxiliary brake cooperates with the parking brake to realize braking and unbraking of the vehicle. By arranging the auxiliary brake, the burden of the parking brake can be reduced, when the load of the trackless auxiliary transport vehicle is large, the auxiliary brake can cooperate with the parking brake to clamp the friction drum together, thereby absorbing kinetic energy to shorten the braking distance and improve the use performance of the hydraulic brake device, and the risk of brake failure can be reduced by preventing the parking brake from overheating during work. In addition, the parking brake and the auxiliary brake can change the flow direction of the oil through the control valve assembly to switch between the braking mode and the unbraking mode, and can be suitable for oil feeding type braking and oil cutting type braking. When the parking brake is oil cutting type braking, the auxiliary brake is oil feeding type braking, when the parking brake is oil feeding type braking, the auxiliary brake is oil cutting type braking, when in the braking mode, one of the parking brake and the auxiliary brake is in the oil injection state, and the other is in the oil return state. Through the above arrangement, the hydraulic brake device can adjust the braking type of the parking brake and the auxiliary brake according to the needs of different types of braking systems, and improve the applicability of the hydraulic brake device. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application, and are incorporated into and constitute a part of this specification. The drawings illustrate one illustrative embodiment of the application and, although the application can not be limited to only this embodiment, and

[0017] Figure 1 A schematic diagram of a brake oil circuit of a hydraulic brake device according to an embodiment of the application is shown.

[0018] Wherein, the above-mentioned drawings include the following reference signs:

[0019] 10, hydraulic pump; 11, motor; 101, first pressure gauge; 102, second pressure gauge; 103, third pressure gauge;

[0020] 21, parking control valve; 22, service brake valve;

[0021] 30, parking brake; 31, first brake part; 32, second brake part; 40, auxiliary brake;

[0022] 50, manual driving assembly; 51, manual pressure pump; 52, manual control valve; 53, first check valve;

[0023] 60, brake accumulator; 61, safety valve; 62, stop valve; 63, second check valve;

[0024] 70, liquid temperature sensor; 80, pressure sensor. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. The description of the at least one example embodiment is actually only illustrative, and is by no means as any limitation on the application and its application or use. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without any creative effort fall within the scope of protection of the application.

[0026] As Figure 1As shown, the embodiment of the present application provides a hydraulic braking device, comprising a braking oil circuit, a hydraulic pump 10, a control valve assembly, a parking brake 30 and an auxiliary brake 40. The hydraulic pump 10 is arranged on the braking oil circuit and is used to provide power to the oil in the braking oil circuit. The control valve assembly is arranged on the braking oil circuit and can control the flow direction of the oil in the braking oil circuit. The parking brake 30 and the auxiliary brake 40 are respectively communicated with the braking oil circuit, the parking brake 30 and the auxiliary brake 40 can both be parked, and the parking brake 30 and the auxiliary brake 40 are simultaneously in a braking mode or a release mode, when in the braking mode, one of the parking brake 30 and the auxiliary brake 40 is in an oil injection state, and the other is in an oil return state.

[0027] According to the technical scheme provided by the present application, the hydraulic braking device comprises a braking oil circuit, a hydraulic pump 10, a control valve assembly, a parking brake 30 and an auxiliary brake 40. The hydraulic pump 10 can drive the oil to circulate in the braking oil circuit through siphon action. The parking brake 30 can clamp the friction drum of the trackless auxiliary transport vehicle to achieve braking or release braking. The auxiliary brake 40 cooperates with the parking brake 30 to jointly achieve braking and release braking of the vehicle. By arranging the auxiliary brake 40, the burden of the parking brake 30 can be reduced. When the load of the trackless auxiliary transport vehicle is large, the auxiliary brake 40 can cooperate with the parking brake 30 to clamp the friction drum together, thereby absorbing kinetic energy to shorten the braking distance and improve the use performance of the hydraulic braking device. At the same time, it can also prevent the parking brake 30 from overheating during work and reduce the risk of brake failure. Moreover, the parking brake 30 and the auxiliary brake 40 can change the flow direction of the oil through the control valve assembly to switch between the braking mode and the release mode, which can be suitable for both oil feeding type braking and oil breaking type braking. When the parking brake 30 is oil breaking type braking, the auxiliary brake 40 is oil feeding type braking. When the parking brake 30 is oil feeding type braking, the auxiliary brake 40 is oil breaking type braking. When in the braking mode, one of the parking brake 30 and the auxiliary brake 40 is in the oil injection state, and the other is in the oil return state. Through the above arrangement, the hydraulic braking device can adjust the braking type of the parking brake 30 and the auxiliary brake 40 according to the needs of different types of braking systems, thereby improving the applicability of the hydraulic braking device.

[0028] Further, the brake oil circuit comprises a main oil circuit, a first branch oil circuit, a second branch oil circuit, a first return oil circuit and a second return oil circuit, the hydraulic pump 10 is arranged on the main oil circuit, the first branch oil circuit and the second branch oil circuit are both in communication with the main oil circuit, the hydraulic brake device further comprises an oil tank, the first return oil circuit and the second return oil circuit are both in communication with the oil tank. The control valve assembly comprises a parking control valve 21 and a service brake valve 22, the parking control valve 21 is arranged on the first branch oil circuit, the parking control valve 21 has a first communication port, a second communication port and a first return port, the second communication port is selectively in communication with the first communication port or the first return port, the first communication port is in communication with the main oil circuit, the second communication port is in communication with the auxiliary brake 40, and the first return port is in communication with the first return oil circuit; the service brake valve 22 is arranged on the second branch oil circuit, the service brake valve 22 has a third communication port, a fourth communication port and a second return port, the fourth communication port is selectively in communication with the third communication port or the second return port, the third communication port is in communication with the main oil circuit, the fourth communication port is in communication with the parking brake 30, and the second return port is in communication with the second return oil circuit.

[0029] When the parking brake 30 is in the oil injection state, the third communication port and the fourth communication port are in communication, the oil flows from the main oil circuit to the parking brake 30 through the second branch oil circuit under the drive of the hydraulic pump 10, the second communication port is in communication with the first return port, and the oil in the auxiliary brake 40 flows to the oil tank through the first return oil circuit; when the parking brake 30 is in the oil return state, the fourth communication port is in communication with the second return port, the oil in the parking brake 30 flows to the oil tank from the second return oil circuit, the first communication port and the second communication port are in communication, and the oil flows from the main oil circuit to the auxiliary brake 40 through the first branch oil circuit under the drive of the hydraulic pump 10. Through the above arrangement, the parking brake 30 and the auxiliary brake 40 can be in the oil injection state and the oil return state respectively under the adjustment of the control valve assembly, the parking brake 30 and the auxiliary brake 40 are controlled separately by the first branch oil circuit and the second branch oil circuit, which prevents the underground trackless auxiliary transport vehicle from causing brake failure when it is impacted or in other situations, the parking brake 30 and the auxiliary brake 40 are independently controlled, when one of them is damaged, the other can still perform parking operation, and such arrangement improves the use performance of the hydraulic brake device, which can still operate when an emergency occurs, thereby ensuring the safety of the trackless auxiliary transport vehicle.

[0030] Specifically, when the parking brake 30 is an oil feeding type brake, and the auxiliary brake 40 is an oil breaking type brake, in the braking mode, the oil enters the main oil path under the driving of the hydraulic pump 10, the second communication port is communicated with the first return oil port, the oil in the auxiliary brake 40 returns to the oil tank through the first return oil path, the first branch oil path is disconnected, the oil enters the second branch oil path under the pressure, and then enters the parking brake 30 through the third communication port and the fourth communication port in sequence, and the parking brake 30 and the auxiliary brake 40 jointly realize braking; in the release mode, the connection state of the parking control valve 21 is switched to connect the first communication port and the second communication port, and the connection state of the service brake valve 22 is switched to connect the fourth communication port and the second return oil port, at this time, the first branch oil path is communicated, the second branch oil path is disconnected, the oil enters the auxiliary brake 40 through the first branch oil path under the pressure driving, the oil in the parking brake 30 returns to the oil tank through the second return oil path, and the parking brake 30 and the auxiliary brake 40 jointly release the brake.

[0031] Specifically, when the parking brake 30 is an oil breaking type brake, and the auxiliary brake 40 is an oil feeding type brake, in the braking mode, the oil enters the main oil path under the driving of the hydraulic pump 10, the fourth communication port is communicated with the second return oil port, the oil in the parking brake 30 returns to the oil tank through the second return oil path, the second branch oil path is disconnected, the oil enters the first branch oil path under the pressure, and then enters the auxiliary brake 40 through the first communication port and the second communication port in sequence, and the parking brake 30 and the auxiliary brake 40 jointly realize braking; in the release mode, the connection state of the service brake valve 22 is switched to connect the fourth communication port and the third communication port, and the connection state of the parking control valve 21 is switched to connect the first return oil port and the second communication port, at this time, the second branch oil path is communicated, the first branch oil path is disconnected, the oil enters the parking brake 30 through the second branch oil path under the pressure driving, the oil in the auxiliary brake 40 returns to the oil tank through the first return oil path, and the parking brake 30 and the auxiliary brake 40 jointly release the brake.

[0032] Specifically, the hydraulic pump 10 is connected with the motor 11, and the hydraulic pump drives the oil to flow to the parking brake 30 and the auxiliary brake 40 under the driving of the motor 11.

[0033] Further, in the present application, the motor 11, the parking control valve 21 and the service brake valve 22 are connected with the remote control brake system through the CAN bus, so that the electric control of the hydraulic brake device can be realized, the synchronization switching of the valve cores in the parking control valve 21 and the service brake valve 22 is ensured, and the motor 11 can be remotely controlled to brake and release the brake of the trackless auxiliary transport vehicle, and the control performance of the overall transport system is improved.

[0034] In the present application, the parking brake 30 comprises a first brake part 31 and a second brake part 32, the first brake part 31 is connected with the front axle of the trackless auxiliary transport vehicle and is used for braking the front wheels of the trackless auxiliary transport vehicle, the second brake part 32 is connected with the rear axle of the trackless auxiliary transport vehicle and is used for braking the rear wheels of the trackless auxiliary transport vehicle, and the oil flows into or out of the front wheels and the rear wheels under pressure, thereby ensuring the braking effect of the whole trackless auxiliary transport vehicle.

[0035] In an embodiment of the present application, the hydraulic braking device further comprises a manual driving assembly 50, the manual driving assembly 50 is arranged on the brake oil circuit, the manual driving assembly 50 is connected with the parking brake 30, and the manual driving assembly 50 can perform oil injection operation on the parking brake 30. Through the above arrangement, when the trackless auxiliary transport vehicle needs to be moved due to failure when the parking brake 30 is in the oil cut-off type braking mode, the manual driving assembly can be used to inject oil into the parking brake 30, so as to adjust the parking brake 30 to the release mode, thereby restoring the operation of the trackless auxiliary transport vehicle.

[0036] Specifically, the manual driving assembly 50 comprises a manual pressure pump 51 and a manual control valve 52, the manual control valve 52 is arranged on the brake oil circuit, the manual control valve 52 has a fifth communication port, a sixth communication port and a seventh communication port, the fifth communication port is in communication with the second communication port, the sixth communication port is in communication with the third communication port, the brake oil circuit further comprises a third branch pipeline, the third branch pipeline is in communication with the oil tank, the seventh communication port is in communication with the third branch pipeline, the manual control valve 52 can be manually switched to make the sixth communication port in communication with the fifth communication port or the seventh communication port, the manual pressure pump 51 is arranged on the third branch pipeline, and the manual pressure pump 51 can drive the oil to flow to the parking brake 30 through the manual control valve 52. Through the above arrangement, the manual driving assembly 50 can be used to drive the oil to flow to the parking brake 30 through the third branch pipeline, so that the parking brake 30 no longer clamps the friction drum, thereby restoring the operation of the trackless auxiliary transport vehicle. In addition, when the manual driving assembly 50 is not needed, the fifth communication port and the sixth communication port are in communication, and the oil passing through the second communication port will return to the first communication port, so as not to affect the normal operation of the oil flowing into the auxiliary brake 40, and when the trackless auxiliary transport vehicle needs to be moved due to failure, the oil pressure can be reduced through the pressure relief port on the auxiliary brake 40, thereby restoring the operation of the trackless auxiliary transport vehicle.

[0037] In another specific embodiment of the present application, when the parking brake 30 is an oil feeding type brake and the auxiliary brake 40 is an oil cutting type brake, when the trackless auxiliary transport vehicle needs to be moved due to a fault, the manual control valve 52 can be adjusted to connect the fifth communication port and the seventh communication port, at this time, the manual pressure pump 51 can drive the oil to flow through the seventh communication port and the fifth communication port to the auxiliary brake 40 in sequence, so that the auxiliary brake 40 no longer clamps the friction drum, and the trackless auxiliary transport vehicle is restored to operation, and the oil pressure can be reduced through the pressure relief port on the parking brake 30 to loosen the parking brake 30 so that the parking brake 30 no longer clamps the friction drum.

[0038] Further, in the present application, the hydraulic brake device has a first check valve 53 arranged on the third branch pipeline, and the first check valve 53 is used to prevent the oil from flowing to the oil tank through the manual control valve 52. By arranging the first check valve 53, it can prevent the hydraulic oil from flowing back when the manual pressure pump 51 is manually operated, and it can also prevent the oil from flowing to the oil tank through the third oil return pipeline during the normal operation of the hydraulic brake device.

[0039] Further, the hydraulic brake device further comprises a brake accumulator 60 connected with the main oil line, and the brake accumulator 60 is used to adjust the pressure of the oil in the brake oil line. By arranging the brake accumulator 60, the pressure of the overall brake oil line can be ensured by the brake accumulator 60, so as to prevent the pressure in the brake oil line from being reduced due to leakage of the hydraulic brake device, and to ensure the braking performance of the hydraulic brake device.

[0040] Preferably, the brake accumulator 60 is a gas type accumulator, the brake accumulator 60 is arranged on the main oil line, and the brake accumulator 60 is filled with gas. When the hydraulic brake device is started, the hydraulic pump 10 drives the hydraulic oil into the brake accumulator 60, the oil compresses the gas in the brake accumulator, and when the pressure reaches a predetermined value, the supply of oil into the brake accumulator 60 is stopped, and the gas in the brake accumulator 60 drives the oil into the main oil line to compensate for the pressure loss in the brake oil line. The brake accumulator 60 is arranged as a gas type accumulator, which can utilize the compressibility of the gas to ensure the stability of the pressure maintained by the brake accumulator 60, and improve the pressure stabilization effect.

[0041] Specifically, the hydraulic brake device further comprises a pressure sensor 80 arranged on the main oil line. When the pressure in the brake accumulator 60 is greater than the pressure set by the pressure sensor 80, the supply of oil into the brake accumulator 60 is stopped to ensure the pressure balance of the brake accumulator 60.

[0042] Further, the hydraulic brake device further comprises a safety valve 61 and a third return oil pipeline, the safety valve 61 is arranged on the third return oil pipeline, and the third return oil pipeline is respectively communicated with the oil tank and the main oil pipeline. When the pressure in the brake accumulator 60 is greater than the pressure set by the pressure sensor 80, the excess oil in the main oil pipeline can open the safety valve 61, and the excess oil is returned to the oil tank through the third return oil pipeline, so as to prevent the excess oil in the main oil pipeline from affecting the normal use of the parking brake 30 and the auxiliary brake 40.

[0043] Specifically, the hydraulic brake device further comprises a stop valve 62 and a fourth return oil pipeline, the stop valve 62 is arranged on the fourth return oil pipeline, the fourth return oil pipeline is respectively communicated with the main oil pipeline and the oil tank, and the connection position of the fourth return oil pipeline and the main oil pipeline is located upstream of the parking control valve 21 and the service brake valve 22. Through the above arrangement, when it is necessary to empty the oil in the brake accumulator 60 as a whole, the stop valve 62 is opened, and the oil in the brake accumulator 60 can flow to the oil tank under the action of gas pressure through the fourth return oil pipeline.

[0044] Further, the hydraulic brake device further has a second one-way valve 63, which is arranged on the main oil pipeline and located upstream of the parking control valve 21 and the service brake valve 22. Through the above arrangement, the second one-way valve 63 can prevent the oil in the main oil pipeline from flowing back to the oil tank, ensure the stability of the pressure of the oil in the whole brake pipeline, and improve the use stability of the hydraulic brake device.

[0045] Further, the hydraulic brake device further has a liquid temperature sensor 70, which is arranged on the oil tank. The liquid temperature sensor 70 is used to detect the temperature of the oil in the oil tank. When the temperature of the oil in the oil tank exceeds the predetermined value of the liquid temperature sensor 70, the liquid temperature sensor 70 transmits a pre-warning signal to the brake system, and the brake system controls the hydraulic brake device to switch to the brake mode through the CAN bus, so as to prevent the brake system from failing due to high temperature, improve the stability of the hydraulic brake device, and ensure the safety performance of the trackless auxiliary transport vehicle.

[0046] In the present application, the hydraulic brake device has a plurality of pressure gauges, including a first pressure gauge 101, a second pressure gauge 102 and a third pressure gauge 103. The first pressure gauge is connected with the safety valve 61 and used to display the pressure change at the safety valve 61, so as to facilitate the observation of the liquid filling condition of the brake accumulator 60. The second pressure gauge 102 is connected with the main oil pipeline, so as to facilitate the pressure change of the oil in the main oil pipeline. The third pressure gauge 103 is arranged at the service brake valve 22, so as to facilitate the pressure change in the parking brake 30, and the oil pressure in the parking brake 30 can be adjusted in time, so as to improve the braking performance.

[0047] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0048] The relative arrangement of components and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the application unless otherwise specifically stated. It is to be understood that the drawings are not necessarily to scale of the various parts shown in the drawings. Techniques, methods, and apparatus known to those of ordinary skill are not discussed in detail because they would be understood that such techniques, methods, and apparatus are considered part of the art. In all examples shown and discussed herein, any specific values are to be interpreted as merely illustrative and not limiting. Thus, other examples of the example embodiments can have different values. It is noted that like numbers and letters on the figures identify like parts throughout the several views, and thus, once an item is defined in one figure, it is not necessary to discuss it further in connection with other figures where it is understood that the item will be present.

[0049] In the description of the present application, it is to be understood that the orientation or positional relationships indicated by terms such as "front", "back", "up", "down", "left", "right", "lateral", "vertical", "horizontal", and "top", "bottom" are generally based on the orientation or positional relationships shown in the drawings, and are merely for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of protection of the present application. The orientation terms "inner", "outer" refer to the inner and outer relative to the contour of the components themselves.

[0050] For purposes of the description hereinafter, spatial or directional terms, for example, "above", "below", "upper", "lower", and the like, can be used, and relate to the device as illustrated in the figures. However, it is to be understood that no absolute or relative orientation of the device is intended or implied, unless specifically described as such. Terms concerning attachments, coupling and the like, such as "connected" and "coupled" and the like, are to be construed in accordance with their normal meanings, that is, as referring to an indirect or direct connection or coupling. Any reference to "comprising" or "containing" is to be construed as meaning "comprising or containing, but not limited to". Any reference to "comprising" or "containing" is to be construed as meaning "comprising or containing, but not limited to".

[0051] In addition, it should be pointed out that the use of the terms "first", "second" and the like, to describe various elements, is merely intended to differentiate the elements from one another, and does not connote any special order or order of precedence, unless otherwise specifically indicated. Thus, the use of the terms "first", "second" and the like, is not intended to limit the scope of the present application, and is not intended to connote any special order or order of precedence.

[0052] The preferred embodiments herein disclosed are not intended to limit or restrict the scope of the application, but merely convey the best mode contemplated by the inventors of carrying out the claimed application. Modifications can be made by those skilled in the art, which yet fall within the scope of the present application. Therefore, it is, therefore, to be understood that any variations made to the application are to be considered as being within the scope of the present application as defined by the appended claims, if any, and their equivalents.

Claims

1. A hydraulic brake device characterized by comprising: The hydraulic brake device comprises: a brake oil circuit; a hydraulic pump (10) arranged on the brake oil circuit and configured to provide power to oil in the brake oil circuit; a control valve assembly arranged on the brake oil circuit and configured to control a flow direction of the oil in the brake oil circuit; a parking brake (30) and an auxiliary brake (40) respectively communicated with the brake oil circuit, the parking brake (30) and the auxiliary brake (40) are capable of parking operation, and the parking brake (30) and the auxiliary brake (40) are simultaneously in a braking mode or a releasing mode, when in the braking mode, one of the parking brake (30) and the auxiliary brake (40) is in an oil injection state, and the other is in an oil return state.

2. The hydraulic brake device according to claim 1, wherein the brake oil circuit comprises a main oil circuit, a first branch oil circuit, a second branch oil circuit, a first oil return circuit and a second oil return circuit, the hydraulic pump (10) is arranged on the main oil circuit, the first branch oil circuit and the second branch oil circuit are communicated with the main oil circuit, and the hydraulic brake device further comprises an oil tank, the first oil return circuit and the second oil return circuit are communicated with the oil tank; the control valve assembly comprises a parking control valve (21) and a service brake valve (22), the parking control valve (21) is arranged on the first branch oil circuit, the parking control valve (21) has a first communication port, a second communication port and a first oil return port, the second communication port is selectively communicated with the first communication port or the first oil return port, the first communication port is communicated with the main oil circuit, the second communication port is communicated with the auxiliary brake (40), and the first oil return port is communicated with the first oil return circuit, the service brake valve (22) is arranged on the second branch oil circuit, the service brake valve (22) has a third communication port, a fourth communication port and a second oil return port, the fourth communication port is selectively communicated with the third communication port or the second oil return port, the third communication port is communicated with the main oil circuit, the fourth communication port is communicated with the parking brake (30), and the second oil return port is communicated with the second oil return circuit; when the parking brake (30) is in the oil injection state, the third communication port and the fourth communication port are communicated, oil flows from the main oil circuit to the parking brake (30) through the second branch oil circuit under the drive of the hydraulic pump (10), the second communication port is communicated with the first oil return port, and oil in the auxiliary brake (40) flows to the oil tank through the first oil return circuit; when the parking brake (30) is in the oil return state, the fourth communication port is communicated with the second oil return port, oil in the parking brake (30) flows to the oil tank from the second oil return circuit, the first communication port and the second communication port are communicated, and oil flows from the main oil circuit to the auxiliary brake (40) through the first branch oil circuit under the drive of the hydraulic pump (10).

3. The hydraulic brake device according to claim 2, characterized by The hydraulic brake device further comprises a manual driving assembly (50) arranged on the brake oil circuit, the manual driving assembly (50) being connected with the parking brake (30) and capable of performing oil injection operation on the parking brake (30).

4. The hydraulic brake apparatus according to claim 3, characterized by The manual driving assembly (50) comprises a manual pressure pump (51) and a manual control valve (52) arranged on the brake oil circuit, the manual control valve (52) having a fifth communication port, a sixth communication port and a seventh communication port, the fifth communication port being in communication with the second communication port, the sixth communication port being in communication with the third communication port, the brake oil circuit further comprising a third branch pipeline in communication with the oil tank, the seventh communication port being in communication with the third branch pipeline, the manual control valve (52) being capable of being manually switched to make the sixth communication port in communication with the fifth communication port or the seventh communication port, and the manual pressure pump (51) being arranged on the third branch pipeline and capable of driving oil to flow to the parking brake (30) through the manual control valve (52).

5. Hydraulic brake device according to claim 4, characterized in that The hydraulic brake device has a first check valve (53) arranged on the third branch pipeline and used for preventing oil from flowing to the oil tank through the manual control valve (52).

6. The hydraulic brake apparatus of claim 2 wherein, The hydraulic brake device further comprises a brake accumulator (60) connected with the main oil circuit and used for adjusting the pressure of oil in the brake oil circuit.

7. Hydraulic brake device according to claim 6, characterized in that The hydraulic brake device further comprises a safety valve (61) arranged on a third oil return pipeline in communication with the oil tank and the main oil circuit.

8. The hydraulic brake apparatus according to claim 6, characterized by The hydraulic brake device further comprises a stop valve (62) arranged on a fourth oil return pipeline in communication with the main oil circuit and the oil tank, and the connection of the fourth oil return pipeline with the main oil circuit is located upstream of the parking control valve (21) and the service brake valve (22).

9. The hydraulic brake apparatus of claim 2 wherein, The hydraulic brake device further has a second check valve (63) arranged on the main oil circuit and located upstream of the parking control valve (21) and the service brake valve (22).

10. The hydraulic brake apparatus of claim 2 wherein, The hydraulic brake device further has a liquid temperature sensor (70) arranged on the oil tank and used for detecting the temperature of oil in the oil tank.

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