WO2023005177A1 - Hydraulic brake system and work machine - Google Patents

Abstract

A hydraulic brake system and a work machine. The system comprises: a pump source (10), a brake fluid refill valve set (20), a parking control valve set (30), a parking brake (40), a control pipeline (50), a brake foot valve set (60) and a drive axle brake (70); the pump source (10) is connected to the brake fluid refill valve set (20); the brake fluid refill valve set (20) is connected to the parking control valve set (30) and the brake foot valve set (60) respectively; the parking control valve set (30) is connected to the parking brake (40) and the control pipeline (50) respectively; and the brake foot valve set (60) is connected to the drive axle brake (70). Hydraulic oil of the pump source (10) flows through the brake fluid refill valve set (20) and the parking control valve set (30), so as to form a parking oil path for supplying oil to the parking brake (40) and an auxiliary oil path for supplying oil to the control pipeline (50); and the hydraulic oil of the pump source (10) flows through the brake fluid refill valve set (20) and the brake foot valve set (60), so as to form a brake oil path for supplying oil to the drive axle brake (70). The functions of driving braking, parking braking and an auxiliary oil source are achieved by means of one pump source, thereby optimizing the pump source, and reducing the energy consumption of the system.

Description

Hydraulic brake system and working machinery

Cross References to Related Applications

This application claims the priority of the Chinese patent application with application number 202110874771.3 and titled "Hydraulic brake system and operating machinery" filed on July 30, 2021, which is incorporated herein by reference in its entirety.

technical field

The present application relates to the field of hydraulic technology, in particular to a hydraulic braking system and a working machine.

Background technique

At present, the mainstream configuration of the braking system is an air braking system, and some high-end configurations are hydraulic braking systems. As the functions of the hydraulic system increase, the number of pump sources is also increasing. However, operating machinery has high requirements on component volume and system energy consumption, so it is urgent to optimize the pump source and reduce system energy consumption.

Contents of the invention

The application provides a hydraulic brake system to solve the defect that the number of pump sources increases with the increase of the functions of the hydraulic system in the prior art. By combining the brake pump source, parking pump source and auxiliary oil The pump source of the source is combined, and the same pump source realizes the functions of service brake, parking brake and auxiliary oil source, which realizes the optimization of the pump source and reduces the energy consumption of the system.

The application also provides a working machine, which is used to solve the problem of increasing the number of pump sources in the prior art as the functions of the hydraulic system increase. The defect that the braking system cannot meet the demand, by combining the pump sources of the brake pump source, parking pump source and auxiliary oil source, the same pump source can realize the functions of service brake, parking brake and auxiliary oil source , realizing the optimization of the pump source and reducing the energy consumption of the system.

According to the first aspect of the present application, a hydraulic braking system is provided, including: a pump source, a brake filling valve group, a parking control valve group, a parking brake, a control pipeline, a brake foot valve group and a drive axle brake ;

The pump source is connected to the brake filling valve group;

The brake filling valve group is respectively connected with the parking control valve group and the brake foot valve group;

The parking control valve group is respectively connected with the parking brake and the control pipeline;

The brake foot valve group is connected to the drive axle brake;

Wherein, the hydraulic oil from the pump source flows through the brake charging valve group and the parking brake valve group, forming a parking oil circuit for supplying oil to the parking brake and a supply circuit for the control pipeline. Auxiliary oil circuit for oil supply;

The hydraulic oil from the pump source flows through the brake filling valve group and the brake foot valve group to form a brake oil circuit for supplying oil to the drive axle brake.

According to an embodiment of the present application, the brake charging valve group has a first charging oil circuit, a second charging oil circuit, a third charging oil circuit and a fourth charging oil circuit;

The first filling oil circuit is connected with the pump source to form a channel for hydraulic oil to flow from the pump source into the brake filling valve group;

The second filling oil circuit is connected with the brake foot valve group, forming a channel for hydraulic oil to flow from the brake filling valve group into the brake foot valve group;

The third filling oil circuit is connected with the parking control valve group to form a channel for hydraulic oil to flow from the brake filling valve group into the parking control valve group;

The fourth liquid-filled oil passage is connected with the oil tank.

Specifically, this embodiment provides an implementation of the brake filling valve group, by setting the first filling oil circuit, the second filling oil circuit, the third filling oil circuit on the brake filling valve group Road and the fourth oil filling circuit realize the supply of hydraulic oil to the parking control valve group and the brake foot valve group.

Furthermore, the hydraulic oil entering the parking control valve group through the brake filling valve group forms, on the one hand, a parking oil circuit for supplying oil to the parking brake, and on the other hand, forms an auxiliary oil circuit for supplying oil to the control pipeline.

Furthermore, the hydraulic oil entering the brake foot valve group through the brake filling valve group forms a brake oil circuit for supplying oil to the drive axle brake.

According to an embodiment of the present application, the parking control valve group includes: a first reversing valve and a parking accumulator;

The first reversing valve has a first reversing first working end, a first reversing second working end and a first reversing third working end;

After the first reversing first working end is coupled with the pipeline of the parking accumulator, it is connected to the third liquid-filled oil circuit;

After the first reversing second working end is coupled with the fourth liquid-filled oil circuit, it is connected to the oil tank;

The first reversing third working end is connected to the parking brake;

Wherein, the first reversing valve is de-energized, the second working end of the first reversing is connected to the third working end of the first reversing, and the hydraulic oil in the third liquid-filled oil circuit flows into the the parking accumulator;

The first reversing valve is energized, the first reversing first working end is connected to the first reversing third working end, and the hydraulic oil in the parking accumulator passes through the first reversing The reversing valve flows into the parking brake to form the parking oil passage.

Specifically, this embodiment provides an implementation of the first reversing valve and the parking accumulator. By setting the first reversing valve, the switching of the oil circuit is realized; when the first reversing valve loses power , the second working end of the first reversing and the third working end of the first reversing are connected, at this time, the second working end of the first reversing is in the disconnected state, and the hydraulic oil flowing through the third liquid-filled oil circuit directly flows into the station. The vehicle accumulator realizes the energy storage in the parking accumulator. At the same time, if there is hydraulic oil in the parking brake, it enters the fourth fluid filling through the first reversing second working end and the first reversing third working end. oil circuit, and finally return to the fuel tank; when the first reversing valve is energized, the first reversing first working end and the first reversing third working end conduct, at this time the hydraulic pressure stored in the parking accumulator The oil enters the parking brake through the first reversing first working end and the first reversing third working end to provide power for the action of the parking brake.

In one application scenario, the parking accumulator has a precharge pressure of 5.0 to 9.0Mpa and a capacity of 1.0 to 2.0L.

According to an embodiment of the present application, the parking control valve group further includes: a first one-way valve, and the first one-way valve is arranged at the point where the third liquid-filled oil passage leads to the first reversing valve. first working end and in the path of the parking accumulator.

Specifically, this embodiment provides an implementation in which a first one-way valve is set in the brake filling valve group. By setting the first one-way valve on the third filling oil circuit, the parking energy storage The hydraulic oil in the device returns to the brake charging valve group.

According to an embodiment of the present application, the parking control valve group further includes: a second reversing valve;

The second reversing valve has a second reversing first working end, a second reversing second working end and a second reversing third working end;

The second reversing first working end is connected to the third liquid-filled oil circuit;

After the second reversing second working end is coupled with the fourth liquid-filled oil circuit, it is connected to the oil tank;

The second reversing third working end is connected to the control pipeline;

Wherein, the second reversing valve is energized, the first working end of the second reversing is connected to the third working end of the second reversing, and the hydraulic oil in the third liquid-filled oil circuit flows into the The control pipeline to form the auxiliary oil circuit;

The second reversing valve is de-energized, the second reversing second working end is connected to the second reversing third working end, and the hydraulic oil in the control pipeline passes through the second reversing The valve flows into the oil tank on the fourth oil-filled oil circuit.

Specifically, this embodiment provides an implementation of the second reversing valve. By setting the second reversing valve, the switching of the oil circuit is realized; when the second reversing valve is energized, the second reversing valve The first working end and the second reversing third working end are connected, at this time, the second reversing second working end is in an open circuit state, and the hydraulic oil flowing through the third liquid-filled oil circuit directly flows into the control pipeline to form auxiliary oil. When the second reversing valve is de-energized, the second reversing second working end and the second reversing third working end are connected, and the hydraulic oil stored in the control pipeline passes through the second reversing second working end. end and the second reversing third working end enter the oil tank on the fourth liquid-filled oil road.

According to an embodiment of the present application, the parking control valve group further includes: an auxiliary accumulator and a pressure reducing valve;

The hydraulic oil of the pump source flows into the auxiliary accumulator;

The decompression valve is arranged on the path from the third liquid-filled oil passage to the first working end of the second reversing and the auxiliary accumulator.

Specifically, this embodiment provides an embodiment in which a pressure reducing valve is set in the brake filling valve group. By setting the pressure reducing valve, the hydraulic oil flowing from the third filling oil circuit to the auxiliary accumulator decompression, so that the hydraulic oil stored in the auxiliary accumulator can be used to supply oil to the control pipeline; The third working end enters the fourth fluid-filled oil circuit, and finally returns to the oil tank.

It should be noted that, under normal circumstances, the pump source and/or the driving accumulator continue to fill the auxiliary accumulator with oil until the set value of the auxiliary accumulator is reached, the pump source and/or the parking accumulator And\or when the driving accumulator fails to supply oil to the system due to failure, power failure or other reasons, the auxiliary accumulator supplies oil to the control pipeline to form an auxiliary oil circuit.

It should also be noted that the control pipeline is connected to the pilot pipeline or the differential pipeline, and by directly obtaining the hydraulic oil from the pump source, the auxiliary oil source is provided for the pilot pipeline or the differential pipeline through the control pipeline. At the same time, the auxiliary oil circuit and the parking oil circuit are combined, that is, the pump source of the auxiliary oil source and the pump source of the parking oil circuit are combined into one, which realizes the optimization of the pump source and reduces the energy consumption of the system.

In one application scenario, the auxiliary accumulator has a precharge pressure of 1.5 to 3.0Mpa and a capacity of 0.16 to 1.0L.

In one application scenario, the pressure of the pressure reducing valve is set at 2.5 to 4.5 MPa.

According to an embodiment of the present application, the parking control valve group further includes: a second one-way valve, and the second one-way valve is arranged at the point where the third liquid-filled oil passage leads to the second reversing valve. on the path of the first working end and the auxiliary accumulator.

Specifically, this embodiment provides an implementation in which a second one-way valve is set in the brake filling valve group. By setting the second one-way valve on the third filling oil circuit, the auxiliary accumulator is avoided. The hydraulic oil inside returns to the brake charging valve group.

According to an embodiment of the present application, the parking control valve group further includes: a relief valve, and the relief valve is arranged between the auxiliary accumulator and the second reversing valve.

Specifically, this embodiment provides an implementation in which a relief valve is set in the brake fluid charging valve group. By setting the relief valve, when the hydraulic oil stored in the auxiliary accumulator reaches the set value, from The excess hydraulic oil captured by the third oil filling circuit can be returned to the oil tank.

In one application scenario, the pressure of the overflow valve is set at 3.0 to 4.5 MPa.

According to an embodiment of the present application, it further includes: a driving accumulator, after the driving accumulator is coupled with the brake foot valve group, it is connected to the second liquid-filled oil circuit.

Specifically, this embodiment provides an implementation manner of a driving accumulator. By setting the driving accumulator, the storage of hydraulic oil required by the drive axle brake is realized.

According to the second aspect of the present application, a work machine is provided, which has the above-mentioned hydraulic braking system.

The above-mentioned one or more technical solutions in this application have at least one of the following technical effects: a hydraulic braking system and a work machine provided by this application, by combining the braking pump source, the parking pump source and the auxiliary oil source The pump sources are combined, and the same pump source realizes the functions of driving brake, parking brake and auxiliary oil source, which realizes the optimization of the pump source and reduces the energy consumption of the system.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Description of drawings

In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are the present For some embodiments of the application, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of the arrangement relationship of the hydraulic braking system provided by the present application;

Fig. 2 is a schematic diagram of the arrangement relationship of the brake filling valve group in the hydraulic braking system provided by the present application;

Fig. 3 is a schematic diagram of the layout relationship of the parking control valve group in the hydraulic braking system provided by the present application;

Fig. 4 is a schematic diagram of the structural relationship of the first reversing valve in the hydraulic braking system provided by the present application;

Fig. 5 is a schematic diagram of the structural relationship of the second reversing valve in the hydraulic braking system provided by the present application.

Reference signs:

10. Pump source; 20. Brake filling valve group; 21. First filling oil circuit;

22. The second liquid-filled oil circuit; 23. The third liquid-filled oil circuit; 24. The fourth liquid-filled oil circuit;

30. Parking control valve group; 31. The first reversing valve; 311. The first working end of the first reversing;

312, the first reversing second working end; 313, the first reversing third working end;

32. Parking accumulator; 33. The first one-way valve; 34. The second reversing valve;

341, the second reversing second working end; 342, the second reversing first working end;

343, the second reversing third working end; 35, the auxiliary accumulator;

36. Pressure reducing valve; 37. Second one-way valve; 38. Relief valve;

40. Parking brake; 50. Control pipeline; 60. Brake foot valve group;

70. Drive axle brake; 80. Driving accumulator; 90. Fuel tank.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "center", "vertical", "transverse", "upper", "lower", "front", "rear", "left", "right" , "vertical", "horizontal", "top", "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing this The application embodiments and simplified descriptions do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

Fig. 1 is a schematic diagram of the arrangement relationship of the hydraulic braking system provided by the present application. Fig. 1 is mainly used to show the layout relationship of the pump source 10, the brake charging valve group 20, the parking control valve group 30 and the brake foot valve group 60, as can be seen from the figure, the brake charging valve group 20, The parking control valve group 30 and the brake foot valve group 60 provide hydraulic oil through the same pump source 10. This setting avoids the problem of setting multiple pump sources 10 in the system and realizes the optimization of the system layout. Reduced system energy consumption.

Further, in the parking control valve group 30, by setting the parking accumulator 32 and the auxiliary accumulator 35, the parking oil circuit for supplying oil to the parking brake 40 and the oil supply for the control pipeline 50 are formed. The auxiliary oil circuit is integrated with the parking oil circuit and the auxiliary oil circuit, and the system is further optimized. One parking control valve group 30 can realize the functions of the two oil circuits.

Fig. 2 is a schematic diagram of the layout relationship of the brake charging valve group 20 in the hydraulic braking system provided by the present application; The liquid oil circuit 22, the third liquid-filled oil circuit 23 and the fourth liquid-filled oil circuit 24 realize the oil supply to the parking control valve group 30 and the brake foot valve group 60 through the provision of the liquid-filled oil circuit, It also realizes that the hydraulic oil in the brake filling valve group 20 , the parking control valve group 30 and the brake foot valve group 60 returns to the oil tank 90 .

Fig. 3 is a schematic diagram of the layout relationship of the parking control valve group 30 in the hydraulic braking system provided by the present application; as can be seen from Fig. 3, the specific settings of the parking oil circuit and the auxiliary oil circuit in the parking control valve group 30 situation, the first reversing valve 31, the parking accumulator 32, the first one-way valve 33, the second reversing valve 34, the auxiliary accumulator 35, the pressure reducing valve 36, the second one-way valve 37 and the overflow The relative arrangement relationship between the valves 38.

Fig. 4 is a schematic diagram of the structural relationship of the first reversing valve 31 in the hydraulic braking system provided by the present application; Fig. 4 shows the first reversing first working end 311, the first reversing valve 31 The second working end 312 and the first reversing third working end 313 .

FIG. 5 is a schematic diagram of the structural relationship of the second reversing valve 34 in the hydraulic braking system provided by the present application. FIG. 5 shows the second reversing first working end 341 , the second reversing second working end 342 and the second reversing third working end 343 in the second reversing valve 34 .

In the description of the embodiments of this application, it should be noted that unless otherwise specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, Or integrated connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application according to specific situations.

In some specific embodiments of the present application, as shown in Figures 1 to 5, the present solution provides a hydraulic braking system, including: a pump source 10, a brake filling valve group 20, a parking control valve group 30, Parking brake 40, control pipeline 50, brake foot valve group 60 and drive axle brake 70; pump source 10 is connected with brake charging valve group 20; brake charging valve group 20 is connected with parking control valve group 30 respectively It is connected with the brake foot valve group 60; the parking control valve group 30 is connected with the parking brake 40 and the control pipeline 50 respectively; the brake foot valve group 60 is connected with the drive axle brake 70; wherein, the hydraulic oil flow of the pump source 10 Through the brake filling valve group 20 and the parking brake valve group, the parking oil circuit for supplying oil to the parking brake 40 and the auxiliary oil circuit for supplying oil to the control pipeline 50 are formed; the hydraulic oil of the pump source 10 flows through The brake liquid filling valve group 20 and the brake foot valve group 60 form a brake oil passage for supplying oil to the drive axle brake 70 .

In detail, the present application provides a hydraulic brake system to solve the defect in the prior art that the number of pump sources 10 is increasing as the functions of the hydraulic system increase. The vehicle pump source 10 and the pump source 10 of the auxiliary oil source are combined, and the same pump source 10 realizes the functions of service brake, parking brake and auxiliary oil source, which realizes the optimization of the pump source 10 and reduces the system energy consumption. consumption.

In some possible embodiments of the present application, the brake filling valve group 20 has a first filling oil passage 21, a second filling oil passage 22, a third filling oil passage 23 and a fourth filling oil passage 24; The first filling oil circuit 21 is connected with the pump source 10 to form a channel for hydraulic oil to flow from the pump source 10 into the brake filling valve group 20; the second filling oil circuit 22 is connected to the brake foot valve group 60 to form a hydraulic oil channel. The channel from the brake filling valve group 20 flows into the brake foot valve group 60; the third filling oil circuit 23 is connected with the parking control valve group 30 to form hydraulic oil flowing from the brake filling valve group 20 into the parking control The channel of the valve group 30 ; the fourth liquid-filled oil circuit 24 is connected with the oil tank 90 .

Specifically, this embodiment provides an implementation of the brake filling valve group 20, by setting the first filling oil passage 21, the second filling oil passage 22, the second filling oil passage 20 on the brake filling valve group 20 The third fluid-filled oil circuit 23 and the fourth fluid-filled oil circuit 24 realize the supply of hydraulic oil to the parking control valve group 30 and the brake foot valve group 60 .

Furthermore, the hydraulic oil that enters the parking control valve group 30 through the brake filling valve group 20 forms, on the one hand, the parking oil circuit for supplying oil to the parking brake 40 , and on the other hand, forms a circuit for supplying oil to the control pipeline 50 . Auxiliary oil circuit.

Furthermore, the hydraulic oil that enters the brake foot valve group 60 through the brake filling valve group 20 forms a brake oil circuit for supplying oil to the drive axle brake 70 .

In some possible embodiments of the present application, the parking control valve group 30 includes: a first reversing valve 31 and a parking accumulator 32; the first reversing valve 31 has a first reversing first working end 311, a first A reversing second working end 312 and a first reversing third working end 313; after the first reversing first working end 311 is coupled with the pipeline of the parking accumulator 32, it is connected to the third liquid-filled oil circuit 23 After the first reversing second working end 312 is coupled with the fourth liquid-filled oil circuit 24, it is connected to the fuel tank 90; the first reversing third working end 313 is connected to the parking brake 40; wherein, the first reversing valve 31 Power failure, the first reversing second working end 312 and the first reversing third working end 313 conduct, and the hydraulic oil in the third liquid-filled oil circuit 23 flows into the parking accumulator 32; the first reversing valve 31 When electrified, the first reversing first working end 311 and the first reversing third working end 313 conduct, and the hydraulic oil in the parking accumulator 32 flows into the parking brake 40 through the first reversing valve 31 to form a parking brake. Oil circuit.

Specifically, this embodiment provides an implementation of the first reversing valve 31 and the parking accumulator 32. By setting the first reversing valve 31, the switching of the oil circuit is realized; when the first reversing valve When the valve 31 is de-energized, the first reversing second working end 312 and the first reversing third working end 313 are connected. The hydraulic oil in the road 23 directly flows into the parking accumulator 32 to realize energy storage in the parking accumulator 32. A reversing third working end 313 enters the fourth liquid-filled oil circuit 24, and finally returns to the oil tank 90; when the first reversing valve 31 is energized, the first reversing first working end 311 and the first reversing first working end The three working ends 313 are connected, and at this time, the hydraulic oil stored in the parking accumulator 32 enters the parking brake 40 through the first reversing first working end 311 and the first reversing third working end 313, which is the parking brake. 40 movements provide power.

In an application scenario, the precharge pressure of the parking accumulator 32 is 5.0 to 9.0 MPa, and the capacity is 1.0 to 2.0 L.

In some possible embodiments of the present application, the parking control valve group 30 further includes: a first one-way valve 33, the first one-way valve 33 is arranged on the third fluid-filled oil circuit 23 leading to the first reversing first working end 311 and the path of the parking accumulator 32.

Specifically, this embodiment provides an implementation in which the first check valve 33 is set in the brake filling valve group 20. By setting the first check valve 33 on the third filling oil circuit 23, avoiding The hydraulic oil in the parking accumulator 32 returns to the brake charging valve group 20 .

In some possible embodiments of the present application, the parking control valve group 30 further includes: a second reversing valve 34; the second reversing valve 34 has a first working end 341 for second reversing, a second working end for second reversing end 342 and the second reversing third working end 343; the second reversing first working end 341 is connected to the third liquid-filled oil circuit 23; the second reversing second working end 342 is coupled with the fourth liquid-filled oil circuit 24 After that, it is connected to the oil tank 90; the second reversing third working end 343 is connected to the control pipeline 50; wherein, the second reversing valve 34 is powered, the second reversing first working end 341 and the second reversing third working end The working end 343 conducts, and the hydraulic oil in the third liquid-filled oil circuit 23 flows into the control pipeline 50 to form an auxiliary oil circuit; the second reversing valve 34 loses power, and the second reversing second working end 342 and the second reversing valve Conducting to the third working end 343 , the hydraulic oil in the control line 50 flows into the oil tank 90 on the fourth liquid-filled oil line 24 through the second reversing valve 34 .

Specifically, this embodiment provides an implementation of the second reversing valve 34 and the auxiliary accumulator 35. By setting the second reversing valve 34, the switching of the oil circuit is realized; when the second reversing valve 34 When energized, the second reversing first working end 341 and the second reversing third working end 343 conduct, and at this time the second reversing second working end 342 is in an open circuit state, and flows through the third liquid-filled oil circuit 23 hydraulic oil directly flows into the control pipeline 50 to form an auxiliary oil circuit; when the second reversing valve 34 is de-energized, the second reversing second working end 342 and the second reversing third working end 343 conduct, and this At this time, the hydraulic oil stored in the auxiliary accumulator 35 enters the oil tank 90 on the fourth liquid-filled oil circuit 24 through the second reversing first working end 341 and the second reversing third working end 343 .

In some possible embodiments of the present application, the parking control valve group 30 further includes: an auxiliary accumulator 35 and a pressure reducing valve 36, the hydraulic oil of the pump source 10 flows into the auxiliary accumulator 35; the pressure reducing valve 36 is arranged at The third liquid-filled oil passage 23 is on a path leading to the second reversing first working end 341 and the auxiliary accumulator 35 .

Specifically, this embodiment provides an implementation in which a pressure reducing valve 36 is provided in the brake filling valve group 20. By setting the pressure reducing valve 36, the flow of the third filling oil circuit 23 to the auxiliary energy storage is realized. The hydraulic oil in the accumulator 35 is decompressed, so that the hydraulic oil stored in the auxiliary accumulator 35 can supply oil to the control pipeline 50; The working end 342 and the second reversing third working end 343 enter the fourth liquid-filled oil passage 24 and finally return to the oil tank 90 .

It should be noted that, under normal circumstances, the pump source 10 and/or the driving accumulator 80 continue to fill the auxiliary accumulator 35 with oil until the set value of the auxiliary accumulator 35 is reached, the pump source 10 and/or When the driving accumulator 80 cannot supply oil to the system due to failure, power failure or other reasons, the auxiliary accumulator 35 supplies oil to the control pipeline 50 to form an auxiliary oil circuit.

It should also be noted that the control line 50 is connected to the pilot line or the differential line, and by directly obtaining the hydraulic oil from the pump source 10, the control line 50 is used to provide the pilot line or the differential line. The auxiliary oil circuit of the auxiliary oil source is combined with the auxiliary oil circuit and the parking oil circuit at the same time, that is, the pump source 10 of the auxiliary oil source and the pump source 10 of the parking oil circuit are combined into one, which realizes the optimization of the pump source 10, Reduced system energy consumption.

In an application scenario, the precharge pressure of the auxiliary accumulator 35 is 1.5 to 3.0Mpa, and the capacity is 0.16 to 1.0L.

In an application scenario, the pressure of the pressure reducing valve 36 is set at 2.5 to 4.5 MPa.

In some possible embodiments of the present application, the parking control valve group 30 further includes: a second one-way valve 37, and the second one-way valve 37 is arranged on the third fluid-filled oil circuit 23 leading to the second reversing first working end 341 and the path of the auxiliary accumulator 35.

Specifically, this embodiment provides an implementation in which a second one-way valve 37 is set in the brake filling valve group 20. By setting the second one-way valve 37 on the third filling oil circuit 23, avoiding The hydraulic oil in the auxiliary accumulator 35 returns to the brake charging valve group 20 .

In some possible embodiments of the present application, the parking control valve group 30 further includes: an overflow valve 38 , and the overflow valve 38 is arranged between the auxiliary accumulator 35 and the second reversing valve 34 .

Specifically, this embodiment provides an implementation in which a relief valve 38 is provided in the brake charging valve group 20. By setting the relief valve 38, the hydraulic oil stored in the auxiliary accumulator 35 reaches the set value. When the value is high, the excess hydraulic oil obtained from the third filling oil passage 23 can be returned to the oil tank 90 .

In an application scenario, the pressure of the overflow valve 38 is set to 3.0 to 4.5 MPa.

In some possible embodiments of the present application, it further includes: a driving accumulator 80 , which is connected to the second fluid-filled oil circuit 22 after being coupled with the brake foot valve group 60 .

Specifically, this embodiment provides an implementation of the driving accumulator 80 , by setting the driving accumulator 80 , the storage of hydraulic oil required by the drive axle brake 70 is realized.

In some specific embodiments of the present application, the present solution provides an operating machine with the above-mentioned hydraulic braking system.

In detail, the present application also provides a working machine to solve the problem of increasing the number of pump sources 10 in the prior art as the functions of the hydraulic system increase. High, the existing hydraulic brake system can not meet the defects of the demand, by combining the brake pump source 10, the parking pump source 10 and the pump source 10 of the auxiliary oil source, the same pump source 10 can realize the service braking, parking The function of vehicle braking and auxiliary oil source realizes the optimization of the pump source 10 and reduces the energy consumption of the system.

In a possible implementation manner, the working machine provided in this embodiment is a loader.

In a possible implementation manner, the working machine provided in this embodiment is a pump truck.

In a possible implementation manner, the working machine provided in this embodiment is a crane.

In the description of the embodiments of this application, it should be noted that unless otherwise specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, Or integrated connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application according to specific situations.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Finally, it should be noted that: the above embodiments are only used to illustrate the present application, but not to limit the present application. Although the present application has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present application do not depart from the spirit and scope of the technical solutions of the present application, and all should cover within the scope of the claims of this application.

Claims (10)

1. A hydraulic braking system, characterized in that it includes: a pump source, a brake filling valve group, a parking control valve group, a parking brake, a control pipeline, a brake foot valve group and a drive axle brake;

   The pump source is connected to the brake filling valve group;

   The brake filling valve group is respectively connected with the parking control valve group and the brake foot valve group;

   The parking control valve group is respectively connected with the parking brake and the control pipeline;

   The brake foot valve group is connected to the drive axle brake;

   Wherein, the hydraulic oil from the pump source flows through the brake charging valve group and the parking brake valve group, forming a parking oil circuit for supplying oil to the parking brake and a supply circuit for the control pipeline. Auxiliary oil circuit for oil supply;

   The hydraulic oil from the pump source flows through the brake filling valve group and the brake foot valve group to form a brake oil circuit for supplying oil to the drive axle brake.
2. A hydraulic braking system according to claim 1, wherein the brake filling valve group has a first filling oil circuit, a second filling oil circuit, a third filling oil circuit and a fourth Fluid-filled oil circuit;

   The first filling oil circuit is connected with the pump source to form a channel for hydraulic oil to flow from the pump source into the brake filling valve group;

   The second filling oil circuit is connected to the brake foot valve group, forming a channel for hydraulic oil to flow from the brake filling valve group into the brake foot valve group;

   The third filling oil circuit is connected with the parking control valve group to form a channel for hydraulic oil to flow from the brake filling valve group into the parking control valve group;

   The fourth liquid-filled oil passage is connected with the oil tank.
3. The hydraulic braking system according to claim 2, wherein the parking control valve group comprises: a first reversing valve and a parking accumulator;

   The first reversing valve has a first reversing first working end, a first reversing second working end and a first reversing third working end;

   After the first reversing first working end is coupled with the pipeline of the parking accumulator, it is connected to the third liquid-filled oil circuit;

   After the first reversing second working end is coupled with the fourth liquid-filled oil circuit, it is connected to the oil tank;

   The first reversing third working end is connected to the parking brake;

   Wherein, the first reversing valve is de-energized, the second working end of the first reversing is connected to the third working end of the first reversing, and the hydraulic oil in the third liquid-filled oil circuit flows into the the parking accumulator;

   The first reversing valve is energized, the first reversing first working end is connected to the first reversing third working end, and the hydraulic oil in the parking accumulator passes through the first reversing The reversing valve flows into the parking brake to form the parking oil passage.
4. The hydraulic braking system according to claim 3, wherein the parking control valve group further comprises: a first one-way valve, the first one-way valve is arranged in the third fluid-filled oil on the path leading to the first reversing first working end and the parking accumulator.
5. The hydraulic braking system according to claim 2, wherein the parking control valve group further comprises: a second reversing valve;

   The second reversing valve has a second reversing first working end, a second reversing second working end and a second reversing third working end;

   The second reversing first working end is connected to the third liquid-filled oil circuit;

   After the second reversing second working end is coupled with the fourth liquid-filled oil circuit, it is connected to the oil tank;

   The second reversing third working end is connected to the control pipeline;

   Wherein, the second reversing valve is energized, the first working end of the second reversing is connected to the third working end of the second reversing, and the hydraulic oil in the third liquid-filled oil circuit flows into the said control pipeline to form said auxiliary oil circuit;

   The second reversing valve is de-energized, the second reversing second working end is connected to the second reversing third working end, and the hydraulic oil in the control pipeline passes through the second reversing The valve flows into the oil tank on the fourth oil-filled oil circuit.
6. A hydraulic braking system according to claim 5, wherein the parking control valve group further comprises: an auxiliary accumulator and a pressure reducing valve;

   The hydraulic oil of the pump source flows into the auxiliary accumulator;

   The decompression valve is arranged on the path from the third liquid-filled oil passage to the first working end of the second reversing and the auxiliary accumulator.
7. The hydraulic braking system according to claim 6, wherein the parking control valve group further comprises: a second one-way valve, the second one-way valve is arranged in the third fluid-filled oil on the path leading to the second reversing first working end and the auxiliary accumulator.
8. The hydraulic braking system according to claim 6, wherein the parking control valve group further comprises: a relief valve, the relief valve is arranged between the auxiliary accumulator and the second between the reversing valves.
9. A hydraulic braking system according to any one of claims 2 to 8, further comprising: a driving accumulator, after the driving accumulator is coupled with the brake foot valve group, it is connected to the Describe the second liquid-filled oil circuit.
10. An operating machine, characterized by having a hydraulic braking system as claimed in any one of claims 1 to 9 above.

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