CN217055730U

CN217055730U - Gearbox, hydraulic control system thereof and engineering machinery

Info

Publication number: CN217055730U
Application number: CN202220577413.6U
Authority: CN
Inventors: 刘豪杰; 赵海滨; 高小康
Original assignee: Suote Transmission Equipment Co Ltd
Current assignee: Suote Transmission Equipment Co Ltd
Priority date: 2022-03-15
Filing date: 2022-03-15
Publication date: 2022-07-26
Anticipated expiration: 2032-03-15

Abstract

The utility model provides a gearbox and hydraulic control system and engineering machine tool thereof, wherein, hydraulic system includes: an oil pump; the oil pump is communicated with a first oil port of the pneumatic reversing valve through a first pipeline; the clutches are arranged in parallel and are communicated with the second oil ports of the pneumatic control reversing valves through second pipelines; the proportional solenoid valve is arranged on the second pipeline; and the accumulator is arranged on the second pipeline and is positioned between the proportional solenoid valve and the clutch. The technical scheme of the utility model the hydraulic system structure of gearbox among the prior art is complicated, and the hydraulic shock of clutch is difficult to absorptive defect.

Description

Gearbox, hydraulic control system thereof and engineering machine

Technical Field

The utility model relates to a hydraulic transmission technical field, concretely relates to gearbox and hydraulic control system and engineering machine tool thereof.

Background

The gearbox is a commonly used mechanism in engineering machinery. The electro-hydraulic control system of the gearbox in the prior art is complex in structure and high in machining precision requirement. A large number of proportional solenoid valves and reversing solenoid valves are used, so that the cost of the gearbox is high, the gearbox is difficult to produce in quantity, and meanwhile, the hydraulic impact of the clutch is difficult to absorb.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the hydraulic system structure complicacy of the gearbox among the prior art, and the hydraulic shock of clutch is difficult to absorptive defect to a gearbox and hydraulic control system and engineering machine tool thereof are provided.

In order to solve the above problem, the utility model provides a hydraulic control system of gearbox, include: an oil pump; the oil pump is communicated with a first oil port of the pneumatic reversing valve through a first pipeline; the clutches are arranged in parallel and are communicated with a second oil port of the pneumatic control reversing valve through a second pipeline; the proportional solenoid valve is arranged on the second pipeline; and the accumulator is arranged on the second pipeline and is positioned between the proportional solenoid valve and the clutch.

Optionally, an accumulator is provided on each second conduit.

Optionally, the hydraulic control system further includes a directional valve disposed on the second line and located downstream of the accumulator, and the at least two clutches are connected to a working oil port of the directional valve.

Optionally, the reversing valve is a two-position four-way reversing valve, and the two clutches are respectively connected with the two working oil ports of the reversing valve.

Optionally, there are three clutches and three second lines.

Optionally, a pressure regulating valve is arranged between the pneumatic control reversing valve and the oil pump.

Optionally, the two oil outlets of the pressure regulating valve are respectively communicated with the first pipeline and the cooling and lubricating pipeline.

Optionally, a filter is provided between the oil pump and the pressure regulating valve.

The utility model also provides a gearbox, including foretell hydraulic control system.

The utility model also provides an engineering machine tool, including foretell gearbox.

The utility model has the advantages of it is following:

utilize the technical scheme of the utility model, among the above-mentioned hydraulic system, gas accuse switching-over valve is according to the fuel feeding of the size control clutch of external atmospheric pressure. And an energy accumulator is arranged on each path of second pipeline, so that hydraulic impact of the clutch can be absorbed. And the hydraulic control system has fewer hydraulic elements, so that the hydraulic control system has a simple structure and is low in cost. Consequently the technical scheme of the utility model the hydraulic system structure of gearbox among the prior art is complicated, and the hydraulic shock of clutch is difficult to the absorptive defect.

Drawings

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

Fig. 1 shows a schematic structural diagram of a first embodiment of the hydraulic control system of the present invention; and

fig. 2 shows a schematic structural diagram of a second embodiment of the hydraulic control system of the present invention.

Description of reference numerals:

10. an oil pump; 20. a pneumatic control reversing valve; 30. a first pipeline; 40. a clutch; 50. a second pipeline; 60. a proportional solenoid valve; 70. an accumulator; 80. a diverter valve; 90. a pressure regulating valve; 100. cooling and lubricating the pipeline; 110. and (3) a filter.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting 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.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example one

As shown in fig. 1, the hydraulic control system of the transmission according to the first embodiment includes an oil pump 10, an air-operated directional valve 20, a plurality of clutches 40, a proportional solenoid valve 60, and an accumulator 70. Wherein, the oil pump 10 is communicated with a first oil port of the pneumatic control reversing valve 20 through a first pipeline 30. A plurality of clutches 40 are arranged in parallel, and the clutches 40 are communicated with the second ports of the pneumatically controlled directional valve 20 through a second line 50. A proportional solenoid valve 60 is provided on the second line 50. An accumulator 70 is disposed on the second line 50 between the proportional solenoid valve 60 and the clutch 40.

With the technical solution of the present embodiment, in the hydraulic system, the pneumatic control directional valve 20 controls the oil supply of the clutch 40 according to the magnitude of the external air pressure. An accumulator 70 is provided on each second line 50 to absorb hydraulic shock of the clutch 40. And the hydraulic control system has fewer hydraulic elements, so that the hydraulic control system has a simple structure and is low in cost. Therefore, the technical scheme of the embodiment overcomes the defects that the hydraulic system of the gearbox in the prior art is complex in structure and hydraulic impact of the clutch is difficult to absorb.

In the present embodiment, the oil pump 10 is adapted to communicate with an external oil source, and the oil pump 10 is capable of supplying hydraulic oil to the hydraulic system.

In this embodiment, the pneumatic control directional valve 20 performs a directional control according to the magnitude of the external air pressure, thereby realizing oil supply or pressure release of the clutch 40. Specifically, when the external air pressure is less than the preset value, the spool of the pneumatic control directional valve 20 moves to the left position under the elastic force of the spring, and at this time, the hydraulic oil may flow into the clutch 40. When the external air pressure is greater than the preset value, the pressure applied to the valve core by the air pressure is greater than the elastic force of the spring, so that the valve core of the pneumatic control reversing valve 20 moves to the right position, and at the moment, the clutch 40 is decompressed.

Further, the magnitude of the external air pressure refers to a change in air pressure caused after braking.

As shown in fig. 1, the second pipeline 50 is provided in plurality in the present embodiment, and a proportional solenoid valve 60 is provided on each second pipeline 50. A person skilled in the art can connect to control the proportional solenoid valve 60 to switch between the left position and the right position by power on or power off, so as to control the oil supply or pressure release of the corresponding clutch 40 on the second pipeline 50.

As shown in fig. 1, an accumulator 70 is provided on the second line 50, and the accumulator 70 is located between the proportional solenoid valve 60 and the clutch 40. The accumulator 70 can absorb the hydraulic shock generated by the clutch 40, thereby making the operation of the transmission smoother.

As shown in fig. 1, in the solution of the present embodiment, an accumulator 70 is disposed on each second pipeline 50. Specifically, in the present embodiment, a plurality of second pipes 50 are provided, one clutch 40 is provided on each second pipe, and one accumulator 70 is provided on each second pipe 50. The accumulator 70 is arranged in such a manner that the hydraulic shock generated by each clutch 40 can be absorbed by the accumulator 70.

As shown in fig. 1, in the solution of the present embodiment, there are three clutches 40 and three second pipes 50. Specifically, three second lines 50 are provided in parallel, and each second line 50 is connected to one clutch 40.

The particular number of clutches 40 may be adjusted depending on the particular configuration of the transmission.

As shown in fig. 1, in the solution of the present embodiment, a pressure regulating valve 90 is provided between the pneumatic control directional valve 20 and the oil pump 10. Specifically, the pressure regulating valve 90 is provided on the first pipe line 30. When the pressure in the first pipeline 30 is greater than the preset value, the pressure regulating valve 90 can release the pressure in the first pipeline 30, so as to ensure that the pressure of the hydraulic system is kept stable.

As shown in fig. 1, in the solution of the present embodiment, two oil outlets of the pressure regulating valve 90 are respectively communicated with the first pipeline 30 and the cooling and lubricating pipeline 100. Specifically, the pressure regulating valve 90 is a two-position three-way reversing valve, which includes an oil inlet and two oil outlets. The oil inlet is connected with the oil pump 10, and the two oil outlets are respectively communicated with the first pipeline 30 and the cooling and lubricating pipeline 100. One control end of a valve core of the pressure regulating valve 90 is connected with a spring, and the other control end of the valve core is connected with an oil inlet through a pipeline.

When the pressure in the first pipe 30 is lower than the preset pressure, the spring keeps the spool of the pressure regulating valve 90 at the left position, and the hydraulic oil pumped by the oil pump 10 flows into the clutch 40 through the first pipe. When the pressure in the first pipeline 30 is greater than the preset value, the oil pressure is greater than the elastic force of the spring, and the spool of the pressure regulating valve 90 moves to the right position, at this time, a part of the hydraulic oil pumped by the oil pump 10 flows into the clutch through the first pipeline 30, and the other part flows into the cooling and lubricating pipeline 100, so that the pressure regulating effect is achieved on the first pipeline 30.

As shown in fig. 1, in the present embodiment, a filter 110 is disposed between the oil pump 10 and the pressure regulating valve 90. A filter 110 is provided on the first pipe 30, and the filter can filter impurities in the hydraulic oil.

Example two

As shown in fig. 2, the hydraulic control system of the second embodiment is different from that of the first embodiment in that the hydraulic control system further includes a direction valve 80, the direction valve 80 is disposed on the second pipeline 50 and downstream of the accumulator 70, and at least two clutches 40 are connected to working oil ports of the direction valve 80.

Specifically, in the second embodiment, at least two clutches 40 among the plurality of clutches 40 are disposed in parallel on one second pipe 50. The directional valve 80 is located between the accumulator 70 and the clutch 40. The supply or release of oil to or from each clutch 40 is controlled by the reversal of the reversing valve 80.

As shown in fig. 2, in the technical solution of this embodiment, the reversing valve 80 is a two-position four-way reversing valve, and the two clutches 40 are respectively connected to two working oil ports of the reversing valve 80. Specifically, when the selector valve 80 is in the left position, the clutch 40 located on the upper side of the two clutches 40 is depressurized, and the clutch located on the lower side is supplied with oil. When the direction valve 80 is in the right position, the clutch 40 located on the upper side supplies oil and the clutch located on the lower side releases pressure.

Of course, the number of clutches 40 connected in parallel on the same second line 50 can be adapted, and accordingly the specific form of the directional control valve 80 can be adapted.

The embodiment also provides a gearbox, and the gearbox comprises the hydraulic control system.

The embodiment also provides the engineering machinery, and the engineering machinery comprises the gearbox.

According to the above description, the present patent application has the following advantages:

1. the structure is simple, and oil supply and pressure relief of the gearbox clutch can be realized only by 3 proportional solenoid valves or 2 proportional solenoid valves and 1 reversing solenoid valve;

2. an energy accumulator is arranged behind each proportional electromagnetic valve, and hydraulic impact in the gear shifting process can be well absorbed.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.

Claims

1. A hydraulic control system for a transmission, comprising:

an oil pump (10);

the oil pump (10) is communicated with a first oil port of the pneumatic control reversing valve (20) through a first pipeline (30);

the clutches (40) are arranged in parallel, and the clutches (40) are communicated with a second oil port of the pneumatic control reversing valve (20) through a second pipeline (50);

a proportional solenoid valve (60) disposed on the second conduit (50);

an accumulator (70) disposed on the second line (50) and between the proportional solenoid valve (60) and the clutch (40).

2. The hydraulic control system according to claim 1, characterized in that the accumulator (70) is provided on each of the second lines (50).

3. The hydraulic control system according to claim 1 or 2, further comprising a directional control valve (80), the directional control valve (80) being arranged on the second line (50) downstream of the accumulator (70), at least two clutches (40) being connected to working ports of the directional control valve (80).

4. The hydraulic control system of claim 3, wherein the reversing valve (80) is a two-position four-way reversing valve, and the two clutches (40) are respectively connected with two working oil ports of the reversing valve (80).

5. The hydraulic control system according to claim 1 or 2, characterized in that the number of the clutches (40) is three and the number of the second lines (50) is three.

6. The hydraulic control system according to claim 1 or 2, characterized in that a pressure regulating valve (90) is provided between the pneumatically controlled directional valve (20) and the oil pump (10).

7. The hydraulic control system according to claim 6, characterized in that the two oil outlets of the pressure regulating valve (90) communicate with the first line (30) and the cooling and lubricating line (100), respectively.

8. The hydraulic control system according to claim 6, characterized in that a filter (110) is provided between the oil pump (10) and the pressure regulating valve (90).

9. A gearbox comprising a hydraulic control system according to any one of claims 1 to 7.

10. A working machine, characterized by comprising a gearbox according to claim 9.