阅读说明：本技术 液压制动系统及作业机械 (Hydraulic brake system and working machine ) 是由 马立春 韦永清 季明君 于 2021-07-30 设计创作，主要内容包括：本发明提供一种液压制动系统及作业机械,所述系统包括：泵源、制动充液阀组、驻车控制阀组、驻车制动器、控制管路、制动脚阀组和驱动桥制动器；泵源与制动充液阀组连接；制动充液阀组分别与驻车控制阀组和所述制动脚阀组连接；驻车控制阀组分别与驻车制动器和控制管路连接；制动脚阀组与驱动桥制动器连接；其中,泵源的液压油流经制动充液阀组和驻车制动阀组,形成为驻车制动器供油的驻车油路以及为控制管路供油的辅助油路；泵源的液压油流经制动充液阀组和制动脚阀组,形成为驱动桥制动器供油的制动油路。本发明通过由同一个泵源实现行车制动、驻车制动和辅助油源的功能,实现了对泵源的优化、减少了系统能耗。(The invention provides a hydraulic brake system and an operating machine, wherein the system comprises: the system comprises a pump source, a braking liquid filling valve bank, a parking control valve bank, a parking brake, a control pipeline, a braking foot valve bank and a drive axle brake; the pump source is connected with the braking liquid filling valve bank; the brake liquid 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 with the drive axle brake; the hydraulic oil of the pump source flows through the brake liquid filling valve group and the parking brake valve group to form a parking oil path for supplying oil to the parking brake and an auxiliary oil path for supplying oil to the control pipeline; and hydraulic oil of the pump source flows through the brake liquid filling valve group and the brake foot valve group to form a brake oil path for supplying oil to the drive axle brake. The invention realizes the functions of service braking, parking braking and auxiliary oil source by the same pump source, realizes the optimization of the pump source and reduces the energy consumption of the system.)

1. A hydraulic brake system, comprising: the system comprises a pump source, a braking liquid filling valve bank, a parking control valve bank, a parking brake, a control pipeline, a braking foot valve bank and a drive axle brake;

the pump source is connected with the braking liquid filling valve group;

the brake liquid 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 with the drive axle brake;

the hydraulic oil of the pump source flows through the brake liquid filling valve group and the parking brake valve group to form a parking oil path for supplying oil to the parking brake and an auxiliary oil path for supplying oil to the control pipeline;

and hydraulic oil of the pump source flows through the brake liquid filling valve group and the brake foot valve group to form a brake oil path for supplying oil to the drive axle brake.

2. The hydraulic brake system as recited in claim 1 wherein the brake charging valve block has a first charging fluid passage, a second charging fluid passage, a third charging fluid passage and a fourth charging fluid passage;

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

the second liquid filling oil path is connected with the brake foot valve group to form a channel for hydraulic oil to flow into the brake foot valve group from the brake liquid filling valve group;

the third liquid filling oil path is connected with a parking control valve group to form a channel for hydraulic oil to flow into the parking control valve group from the braking liquid filling valve group;

and the fourth liquid filling oil path is connected with an oil tank.

3. A hydraulic brake system according to claim 2, wherein the park control valve assembly includes: a first reversing valve and a parking accumulator;

the first reversing valve is provided with a first reversing first working end, a first reversing second working end and a first reversing third working end;

the first reversing first working end is coupled with a pipeline of the parking accumulator and then is connected to the third liquid charging oil way;

the first reversing second working end is coupled with the fourth liquid filling oil path and then is connected to the oil tank;

the first reversing third working end is connected with the parking brake;

when the first reversing valve is powered off, the first reversing second working end and the first reversing third working end are communicated, and hydraulic oil in the third oil filling path flows into the parking accumulator;

the first reversing valve is electrified, the first reversing first working end and the first reversing third working end are communicated, and hydraulic oil in the parking energy accumulator flows into the parking brake through the first reversing valve to form the parking oil path.

4. The hydraulic brake system of claim 3, wherein the park control valve set further comprises: and the first check valve is arranged on a path of the third liquid filling oil path to the first reversing first working end and the parking accumulator.

5. The hydraulic brake system of claim 2, wherein the park control valve set further comprises: a second directional control valve;

the second reversing valve is provided with 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 into the third liquid filling oil path;

the second reversing second working end is coupled with the fourth liquid filling oil path and then is connected to the oil tank;

the second reversing third working end is connected with the control pipeline;

the second reversing valve is electrified, the second reversing first working end and the second reversing third working end are communicated, and hydraulic oil in the third liquid filling oil way flows into the control pipeline to form the auxiliary oil way;

and when the second reversing valve is powered off, the second reversing second working end is communicated with the second reversing third working end, and the hydraulic oil in the control pipeline flows into the oil tank on the fourth liquid filling oil way through the second reversing valve.

6. The hydraulic brake system of claim 5, wherein the park control valve set further comprises: an auxiliary accumulator and a pressure relief valve;

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

the pressure reducing valve is arranged on a path of the third liquid filling oil path to the second reversing first working end and the auxiliary accumulator.

7. The hydraulic brake system of claim 6, wherein the park control valve set further comprises: and the second one-way valve is arranged on a path of the third liquid filling oil path to the second reversing first working end and the auxiliary accumulator.

8. The hydraulic brake system of claim 6, wherein the park control valve set further comprises: and the overflow valve is arranged between the auxiliary energy accumulator and the second reversing valve.

9. A hydraulic brake system according to any one of claims 2 to 8, further comprising: and the running energy accumulator is coupled with the brake foot valve group and then is connected to the second liquid charging oil way.

10. A work machine having a hydraulic brake system as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of hydraulic pressure, in particular to a hydraulic braking system and an operating machine.

Background

Currently, the main stream of the brake system is configured as a pneumatic brake system, and a part of the brake system is configured as a hydraulic brake system at a high end. As the functions of hydraulic systems increase, the number of pump sources also increases. The working machine has high requirements on element size and system energy consumption, so that the optimization of a pump source and the reduction of the system energy consumption are urgently needed.

Disclosure of Invention

The invention provides a hydraulic brake system, which is used for solving the defect that the number of pump sources is more and more along with the increase of functions of a hydraulic system in the prior art.

The invention also provides a working machine, which is used for solving the defects that the number of pump sources is more and more along with the increase of the functions of a hydraulic system, the requirements of the working machine on the element size and the energy consumption of the system are higher, and the conventional hydraulic braking system cannot meet the requirements.

According to a first aspect of the present invention there is provided a hydraulic brake system comprising: the system comprises a pump source, a braking liquid filling valve bank, a parking control valve bank, a parking brake, a control pipeline, a braking foot valve bank and a drive axle brake;

the pump source is connected with the braking liquid filling valve group;

the brake liquid 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 with the drive axle brake;

the hydraulic oil of the pump source flows through the brake liquid filling valve group and the parking brake valve group to form a parking oil path for supplying oil to the parking brake and an auxiliary oil path for supplying oil to the control pipeline;

and hydraulic oil of the pump source flows through the brake liquid filling valve group and the brake foot valve group to form a brake oil path for supplying oil to the drive axle brake.

According to one embodiment of the invention, the brake liquid filling valve group is provided with a first liquid filling oil path, a second liquid filling oil path, a third liquid filling oil path and a fourth liquid filling oil path;

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

the second liquid filling oil path is connected with the brake foot valve group to form a channel for hydraulic oil to flow into the brake foot valve group from the brake liquid filling valve group;

the third liquid filling oil path is connected with a parking control valve group to form a channel for hydraulic oil to flow into the parking control valve group from the braking liquid filling valve group;

and the fourth liquid filling oil path is connected with an oil tank.

Specifically, the embodiment provides an implementation manner of a brake fluid-filled valve group, and a first fluid-filled oil path, a second fluid-filled oil path, a third fluid-filled oil path and a fourth fluid-filled oil path are arranged on the brake fluid-filled valve group, so that hydraulic oil is supplied to a parking control valve group and a brake foot valve group.

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

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

According to an embodiment of the invention, the parking control valve group comprises: a first reversing valve and a parking accumulator;

the first reversing valve is provided with a first reversing first working end, a first reversing second working end and a first reversing third working end;

the first reversing first working end is coupled with a pipeline of the parking accumulator and then is connected to the third liquid charging oil way;

the first reversing second working end is coupled with the fourth liquid filling oil path and then is connected to the oil tank;

the first reversing third working end is connected with the parking brake;

when the first reversing valve is powered off, the first reversing second working end and the first reversing third working end are communicated, and hydraulic oil in the third oil filling path flows into the parking accumulator;

the first reversing valve is electrified, the first reversing first working end and the first reversing third working end are communicated, and hydraulic oil in the parking energy accumulator flows into the parking brake through the first reversing valve to form the parking oil path.

Specifically, the embodiment provides an implementation manner of a first reversing valve and a parking accumulator, and switching of an oil path is realized by providing the first reversing valve; when the first reversing valve is powered off, the first reversing second working end and the first reversing third working end are conducted, the first reversing second working end is in an open circuit state, hydraulic oil flowing through the third liquid charging oil way directly flows into the parking energy accumulator to realize energy storage of the parking energy accumulator, and meanwhile, if hydraulic oil exists in the parking brake, the hydraulic oil enters the fourth liquid charging oil way through the first reversing second working end and the first reversing third working end and finally flows back to the oil tank; when the first reversing valve is electrified, the first reversing first working end and the first reversing third working end are conducted, and at the moment, hydraulic oil stored in the parking energy accumulator 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 pre-charge pressure of the parking accumulator is 5.0 to 9.0Mpa, and the capacity is 1.0 to 2.0L.

According to an embodiment of the invention, the parking control valve group further comprises: and the first check valve is arranged on a path of the third liquid filling oil path to the first reversing first working end and the parking accumulator.

Specifically, the embodiment provides an implementation mode in which the first check valve is arranged in the brake charging valve group, and the first check valve is arranged on the third charging oil path, so that hydraulic oil in the parking accumulator is prevented from flowing back to the brake charging valve group.

According to an embodiment of the invention, the parking control valve group further comprises: a second directional control valve;

the second reversing valve is provided with 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 into the third liquid filling oil path;

the second reversing second working end is coupled with the fourth liquid filling oil path and then is connected to the oil tank;

the second reversing third working end is connected with the control pipeline;

the second reversing valve is electrified, the second reversing first working end and the second reversing third working end are communicated, and hydraulic oil in the third liquid filling oil way flows into the control pipeline to form the auxiliary oil way;

and when the second reversing valve is powered off, the second reversing second working end is communicated with the second reversing third working end, and the hydraulic oil in the control pipeline flows into the oil tank on the fourth liquid filling oil way through the second reversing valve.

Specifically, the present embodiment provides an implementation manner of a second directional valve, and by providing the second directional valve, switching of oil paths is achieved; when the second reversing valve is electrified, the second reversing first working end is communicated with the second reversing third working end, the second reversing second working end is in a circuit-breaking state, and hydraulic oil flowing through the third liquid-filling oil way directly flows into the control pipeline to form an auxiliary oil way; when the second reversing valve is powered off, the second reversing second working end and the second reversing third working end are communicated, and at the moment, hydraulic oil stored in the control pipeline enters the oil tank on the fourth liquid-filled oil path through the second reversing second working end and the second reversing third working end.

According to an embodiment of the invention, the parking control valve group further comprises: an auxiliary accumulator and a pressure relief valve;

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

the pressure reducing valve is arranged on a path of the third liquid filling oil path to the second reversing first working end and the auxiliary accumulator.

Specifically, the embodiment provides an implementation mode in which a pressure reducing valve is arranged in a brake liquid filling valve bank, and by arranging the pressure reducing valve, the pressure reduction of the hydraulic oil flowing from the third liquid filling oil path to the auxiliary energy accumulator is realized, so that the hydraulic oil stored in the auxiliary energy accumulator can be supplied to a control pipeline; meanwhile, if hydraulic oil exists in the control pipeline, the hydraulic oil enters a fourth liquid filling oil path through the second reversing second working end and the second reversing third working end and finally flows back to the oil tank.

It should be noted that, under the conventional circumstances, the pump source and/or the traveling energy accumulator continuously injects oil into the auxiliary energy accumulator until reaching the set value of the auxiliary energy accumulator, and when the pump source and/or the parking energy accumulator and/or the traveling energy accumulator cannot supply oil to the system due to a fault, a power failure or other reasons, the auxiliary energy accumulator supplies oil to the control pipeline, so as to form an auxiliary oil path.

It should be further noted that the control pipeline is connected with the pilot pipeline or the differential pipeline, and hydraulic oil is directly obtained from the pump source, so that an auxiliary oil path of the auxiliary oil source is provided for the pilot pipeline or the differential pipeline through the control pipeline, and meanwhile, the auxiliary oil path and the parking oil path are combined, that is, the pump source of the auxiliary oil source and the pump source of the parking oil path are combined into one, so that the pump source is optimized, and the energy consumption of the system is reduced.

In one application scenario, the pre-charge pressure of the auxiliary accumulator is 1.5 to 3.0Mpa, and the capacity is 0.16 to 1.0L.

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

According to an embodiment of the invention, the parking control valve group further comprises: and the second one-way valve is arranged on a path of the third liquid filling oil path to the second reversing first working end and the auxiliary accumulator.

Specifically, the embodiment provides an implementation mode in which the second check valve is disposed in the brake charging valve group, and the second check valve is disposed on the third charging oil path, so that hydraulic oil in the auxiliary accumulator is prevented from flowing back to the brake charging valve group.

According to an embodiment of the invention, the parking control valve group further comprises: and the overflow valve is arranged between the auxiliary energy accumulator and the second reversing valve.

Specifically, the embodiment provides an implementation mode in which an overflow valve is arranged in a brake liquid filling valve bank, and by arranging the overflow valve, when hydraulic oil stored in the auxiliary accumulator reaches a set value, surplus hydraulic oil obtained from the third liquid filling oil line can flow back to the oil tank.

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

According to an embodiment of the present invention, further comprising: and the running energy accumulator is coupled with the brake foot valve group and then is connected to the second liquid charging oil way.

Specifically, the embodiment provides an implementation manner of a service energy accumulator, and the service energy accumulator is arranged to store hydraulic oil required by a drive axle brake.

According to a second aspect of the present disclosure, a work machine is provided having a hydraulic brake system as described above.

One or more technical solutions in the present invention have at least one of the following technical effects: according to the hydraulic brake system and the operation machine, the pump sources of the brake pump source, the parking pump source and the auxiliary oil source are combined, and the functions of service brake, parking brake and the auxiliary oil source are realized by the same pump source, so that the pump source is optimized, and the energy consumption of the system is reduced.

Additional aspects and advantages of the invention 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 invention.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic layout of a hydraulic brake system provided by the present invention;

FIG. 2 is a schematic diagram illustrating the arrangement of a brake charging valve set in the hydraulic brake system according to the present invention;

FIG. 3 is a schematic diagram illustrating the arrangement of a parking control valve set in the hydraulic brake system provided by the present invention;

FIG. 4 is a schematic structural relationship diagram of a first directional control valve in the hydraulic brake system provided by the present invention;

fig. 5 is a schematic structural relationship diagram of a second direction valve in the hydraulic brake system provided by the invention.

Reference numerals:

10. a pump source; 20. A brake charging valve bank; 21. A first charging oil path;

22. a second liquid charging path; 23. A third liquid charging path; 24. A fourth liquid charging path;

30. a parking control valve set; 31. A first direction changing valve; 311. A first commutating first working end;

312. a first reversing second working end; 313. A first commutation third working end; 32. A parking accumulator;

33. a first check valve; 34. A second directional control valve; 341. A second inverting second working end;

342. a second inverting first working end; 343. A second commutation third working end; 35. An auxiliary accumulator;

36. a pressure reducing valve; 37. A second one-way valve; 38. An overflow valve;

40. a parking brake; 50. A control pipeline; 60. A brake foot valve set;

70. a transaxle brake; 80. A travelling crane energy accumulator; 90. And an oil tank.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Fig. 1 is a schematic layout view of a hydraulic brake system provided by the present invention. Fig. 1 is mainly used to show the arrangement relationship of the pump sources 10, the brake charging valve group 20, the parking control valve group 30 and the brake foot valve group 60, and it can be seen from the figure that 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, and this arrangement avoids the problem of arranging a plurality of pump sources 10 in the system, realizes the optimization of the system arrangement, and reduces the energy consumption of the system.

Further, in the parking control valve group 30, 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 are formed by arranging the parking accumulator 32 and the auxiliary accumulator 35, the parking oil path and the auxiliary oil path are integrally arranged, the system is further optimized, and the functions of two oil paths can be realized in one parking control valve group 30.

FIG. 2 is a schematic diagram of a hydraulic brake system according to the present invention, illustrating the arrangement of a brake charging valve set 20; fig. 2 shows a first liquid filling oil path 21, a second liquid filling oil path 22, a third liquid filling oil path 23 and a fourth liquid filling oil path 24 which are arranged on the brake liquid filling valve group 20, so that oil supply to the parking control valve group 30 and the brake foot valve group 60 is realized through the provision of the liquid filling oil paths, and a hydraulic oil return oil tank 90 in the brake liquid filling valve group 20, the parking control valve group 30 and the brake foot valve group 60 is also realized.

Fig. 3 is a schematic diagram illustrating the arrangement relationship of the parking control valve group 30 in the hydraulic brake system provided by the present invention; as can be seen from fig. 3, the specific arrangement of the parking oil passage and the auxiliary oil passage in the parking control valve group 30, the relative arrangement relationship among the first direction changing valve 31, the parking accumulator 32, the first check valve 33, the second direction changing valve 34, the auxiliary accumulator 35, the pressure reducing valve 36, the second check valve 37 and the relief valve 38.

Fig. 4 is a schematic structural relationship diagram of the first direction valve 31 in the hydraulic brake system provided by the present invention; fig. 4 shows the first direction switching first working end 311, the first direction switching second working end 312 and the first direction switching third working end 313 in the first direction switching valve 31.

Fig. 5 is a schematic structural relationship diagram of the second direction valve 34 in the hydraulic brake system provided by the present invention. Fig. 5 illustrates a second direction switching first working end 341, a second direction switching second working end 342, and a second direction switching third working end 343 of the second direction switching valve 34.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

In some embodiments of the present invention, as shown in fig. 1 to 5, the present solution provides a hydraulic brake system including: a pump source 10, a brake charging 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 with a braking liquid filling valve group 20; the brake charging valve group 20 is respectively connected with the parking control valve group 30 and the brake foot valve group 60; the parking control valve group 30 is respectively connected with the parking brake 40 and the control pipeline 50; the brake foot valve group 60 is connected with a drive axle brake 70; the hydraulic oil of the pump source 10 flows through the brake charging valve group 20 and the parking brake valve group 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; the hydraulic oil of the pump source 10 flows through the brake charging valve group 20 and the brake foot valve group 60 to form a brake oil path for supplying the transaxle brake 70 with the oil.

In detail, the invention provides a hydraulic brake system, which is used for solving the defect that the number of pump sources 10 is more and more along with the increase of functions of a hydraulic system in the prior art, and realizes the functions of service braking, parking braking and auxiliary oil sources by combining the brake pump sources 10, the parking pump sources 10 and the pump sources 10 of the auxiliary oil sources and using the same pump source 10, thereby realizing the optimization of the pump sources 10 and reducing the energy consumption of the system.

In some possible embodiments of the present invention, the brake charging valve set 20 has a first charging oil path 21, a second charging oil path 22, a third charging oil path 23 and a fourth charging oil path 24; the first liquid filling oil path 21 is connected with the pump source 10 to form a passage for hydraulic oil to flow into the brake liquid filling valve group 20 from the pump source 10; the second liquid filling oil path 22 is connected with the brake foot valve set 60 to form a passage for hydraulic oil to flow from the brake liquid filling valve set 20 to the brake foot valve set 60; the third charging oil path 23 is connected with the parking control valve group 30 to form a passage through which hydraulic oil flows into the parking control valve group 30 from the brake charging valve group 20; the fourth charge oil passage 24 is connected to the oil tank 90.

Specifically, the present embodiment provides an implementation of the brake fluid filling valve group 20, and the first fluid filling oil path 21, the second fluid filling oil path 22, the third fluid filling oil path 23 and the fourth fluid filling oil path 24 are disposed on the brake fluid filling valve group 20, so that hydraulic oil is supplied to the parking control valve group 30 and the brake foot valve group 60.

Further, the hydraulic oil introduced into the parking control valve group 30 through the brake charging valve group 20 is formed as a parking oil path for supplying oil to the parking brake 40 on the one hand, and an auxiliary oil path for supplying oil to the control line 50 on the other hand.

Further, the hydraulic oil that enters the brake foot valve group 60 through the brake charging valve group 20 forms a brake oil path that supplies the transaxle brake 70 with oil.

In some possible embodiments of the invention, the parking control valve group 30 comprises: a first directional valve 31 and a parking accumulator 32; the first direction changing valve 31 has a first direction changing first working end 311, a first direction changing second working end 312 and a first direction changing third working end 313; the first reversing first working end 311 is coupled with the pipeline of the parking accumulator 32 and then is connected to the third liquid charging path 23; the first reversing second working end 312 is coupled with the fourth liquid charging path 24 and then is connected to the oil tank 90; the first reversing third working end 313 is connected with the parking brake 40; when the first reversing valve 31 is de-energized, the first reversing second working end 312 and the first reversing third working end 313 are conducted, and the hydraulic oil in the third oil charging path 23 flows into the parking accumulator 32; the first direction changing valve 31 is electrified, the first direction changing first working end 311 and the first direction changing third working end 313 are conducted, and hydraulic oil in the parking accumulator 32 flows into the parking brake 40 through the first direction changing valve 31 to form a parking oil path.

Specifically, the present embodiment provides an implementation of the first direction changing valve 31 and the parking accumulator 32, and by providing the first direction changing valve 31, the oil path is switched; when the first reversing valve 31 is de-energized, the first reversing second working end 312 and the first reversing third working end 313 are conducted, at this time, the first reversing second working end 312 is in an open circuit state, hydraulic oil flowing through the third oil charging path 23 directly flows into the parking accumulator 32 to realize energy storage in the parking accumulator 32, and if hydraulic oil exists in the parking brake 40, the hydraulic oil enters the fourth oil charging path 24 through the first reversing second working end 312 and the first reversing third working end 313 and finally flows back to the oil tank 90; when the first direction valve 31 is powered on, the first direction first working end 311 and the first direction third working end 313 are conducted, and at this time, the hydraulic oil stored in the parking accumulator 32 enters the parking brake 40 through the first direction first working end 311 and the first direction third working end 313 to provide power for the action of the parking brake 40.

In one application scenario, the pre-charge pressure of the parking accumulator 32 is 5.0 to 9.0Mpa and the capacity is 1.0 to 2.0L.

In some possible embodiments of the invention, the parking control valve group 30 further comprises: the first check valve 33, the first check valve 33 is disposed on a path of the third charge oil path 23 leading to the first direction switching first working port 311 and the parking accumulator 32.

Specifically, the present embodiment provides an embodiment in which the first check valve 33 is disposed in the brake charging valve group 20, and the first check valve 33 is disposed in the third charging oil path 23, so that the hydraulic oil in the parking accumulator 32 is prevented from flowing back to the brake charging valve group 20.

In some possible embodiments of the invention, the parking control valve group 30 further comprises: a second direction valve 34; the second direction valve 34 has a second direction first working end 341, a second direction second working end 342 and a second direction third working end 343; the second reversing first working end 341 is connected to the third liquid charging path 23; the second reversing second working end 342 is coupled with the fourth liquid charging path 24 and then is connected to the oil tank 90; the second reversing third working end 343 is connected with the control pipeline 50; the second direction valve 34 is powered on, the second direction first working end 341 and the second direction third working end 343 are communicated, and the hydraulic oil in the third hydraulic oil filling path 23 flows into the control line 50 to form an auxiliary oil path; when the second direction valve 34 is de-energized, the second direction second working end 342 and the second direction third working end 343 are conducted, and the hydraulic oil in the control pipeline 50 flows into the oil tank 90 on the fourth oil charging pipeline 24 through the second direction valve 34.

Specifically, the present embodiment provides an implementation manner of the second direction valve 34 and the auxiliary accumulator 35, and by providing the second direction valve 34, the switching of the oil path is realized; when the second directional valve 34 is powered on, the second directional first working end 341 and the second directional third working end 343 are connected, and at this time, the second directional second working end 342 is in an open circuit state, and the hydraulic oil flowing through the third fluid-filled oil path 23 directly flows into the control pipeline 50 to form an auxiliary oil path; when the second direction valve 34 is de-energized, the second direction second working end 342 and the second direction third working end 343 are connected, and at this time, the hydraulic oil stored in the auxiliary accumulator 35 enters the oil tank 90 on the fourth fluid charging path 24 through the second direction first working end 341 and the second direction third working end 343.

In some possible embodiments of the invention, the parking control valve group 30 further comprises: an auxiliary accumulator 35 and a pressure reducing valve 36, hydraulic oil of the pump source 10 flows into the auxiliary accumulator 35; the pressure reducing valve 36 is provided on a path of the third charge oil path 23 leading to the second direction switching first working port 341 and the auxiliary accumulator 35.

Specifically, the embodiment provides an implementation manner in which the pressure reducing valve 36 is disposed in the brake fluid charging valve group 20, and by disposing the pressure reducing valve 36, pressure reduction of the hydraulic oil flowing from the third fluid charging line 23 to the auxiliary accumulator 35 is achieved, so that the hydraulic oil stored in the auxiliary accumulator 35 can be supplied to the control pipeline 50; meanwhile, if hydraulic oil is in the control pipeline 50, the hydraulic oil enters the fourth liquid filling oil path 24 through the second direction-changing second working end 342 and the second direction-changing third working end 343, and finally flows back to the oil tank 90.

It should be noted that, under the conventional circumstances, the pump source 10 and/or the traveling energy accumulator 80 continuously injects oil into the auxiliary energy accumulator 35 until the set value of the auxiliary energy accumulator 35 is reached, and when the pump source 10 and/or the traveling energy accumulator 80 cannot supply oil to the system due to a fault, a power failure, or other reasons, the auxiliary energy accumulator 35 supplies oil to the control pipeline 50, so as to form an auxiliary oil path.

It should be further noted that the control pipeline 50 is connected to the pilot pipeline or the differential pipeline, and hydraulic oil is directly obtained from the pump source 10, so that an auxiliary oil path of the auxiliary oil source is provided for the pilot pipeline or the differential pipeline through the control pipeline 50, and the auxiliary oil path and the parking oil path are combined at the same time, that is, the pump source 10 of the auxiliary oil source and the pump source 10 of the parking oil path are combined into one, so that optimization of the pump source 10 is realized, and energy consumption of the system is reduced.

In one application scenario, the pre-charge pressure of the auxiliary accumulator 35 is 1.5 to 3.0Mpa, and the capacity is 0.16 to 1.0L.

In one application scenario, the pressure of the pressure relief valve 36 is set to 2.5 to 4.5 MPa.

In some possible embodiments of the invention, the parking control valve group 30 further comprises: and a second check valve 37. the second check valve 37 is disposed on a path of the third charge oil path 23 leading to the second direction switching first working port 341 and the auxiliary accumulator 35.

Specifically, the present embodiment provides an embodiment in which the second check valve 37 is disposed in the brake charging valve group 20, and the second check valve 37 is disposed in the third charging oil path 23, so that the hydraulic oil in the auxiliary accumulator 35 is prevented from flowing back to the brake charging valve group 20.

In some possible embodiments of the invention, the parking control valve group 30 further comprises: and a relief valve 38, the relief valve 38 being provided between the auxiliary accumulator 35 and the second direction switching valve 34.

Specifically, the embodiment provides an implementation mode in which the relief valve 38 is disposed in the brake charging valve group 20, and by disposing the relief valve 38, when the hydraulic oil stored in the auxiliary accumulator 35 reaches a set value, the excess hydraulic oil obtained from the third charging oil path 23 can flow back to the oil tank 90.

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

In some possible embodiments of the present invention, the method further includes: and the service energy accumulator 80 is coupled with the brake foot valve group 60 and then connected into the second liquid charging oil path 22.

Specifically, the present embodiment provides an implementation of the service energy accumulator 80, and the service energy accumulator 80 is provided to store the hydraulic oil required by the transaxle brake 70.

In some embodiments of the present disclosure, the present disclosure provides a work machine having a hydraulic brake system as described above.

In detail, the invention also provides a working machine, which is used for solving the defects that the number of the pump sources 10 is more and more along with the increase of the functions of a hydraulic system, the requirements of the working machine on the element size and the energy consumption of the system are higher, and the existing hydraulic braking system cannot meet the requirements in the prior art, and the functions of service braking, parking braking and auxiliary oil sources are realized by the same pump source 10 by combining the brake pump source 10, the parking pump source 10 and the pump source 10 of the auxiliary oil source, so that the optimization of the pump source 10 is realized, and the energy consumption of the system is reduced.

In a possible embodiment, the present embodiment provides that the work machine is a loader.

In a possible embodiment, the present embodiment provides the work machine as a pump truck.

In a possible embodiment, the work machine provided by the present embodiment is a crane.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.