Transmission and hydraulic control system and engineering machinery

Abstract

The present invention provides a transmission, a hydraulic control system, and engineering machinery. The hydraulic system includes an oil pump; an air-controlled reversing valve, the oil pump connected to a first oil port of the air-controlled reversing valve via a first pipeline; multiple clutches arranged in parallel and connected to a second oil port of the air-controlled reversing valve via a second pipeline; a proportional solenoid valve disposed in the second pipeline; and an accumulator disposed in the second pipeline and located between the proportional solenoid valve and the clutches. The technical solution of the present invention addresses the drawbacks of conventional transmissions, such as complex hydraulic systems and difficulty absorbing hydraulic shock from the clutches.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic transmission, and in particular to a gearbox and a hydraulic control system thereof, as well as engineering machinery. Background Art

[0002] Gearboxes are commonly used in construction machinery. Existing electro-hydraulic control systems for gearboxes are complex and require high machining precision. The extensive use of proportional and reversing solenoid valves results in high gearbox costs, making mass production difficult. Furthermore, the clutch hydraulic shock is difficult to absorb. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the hydraulic system of the gearbox in the prior art that the hydraulic shock of the clutch is difficult to absorb, thereby providing a gearbox and its hydraulic control system and engineering machinery.

[0004] In order to solve the above problems, the present invention provides a hydraulic control system for a transmission, including: an oil pump; an air-controlled reversing valve, the oil pump is connected to a first oil port of the air-controlled reversing valve through a first pipeline; a plurality of clutches, the plurality of clutches are arranged in parallel, and the clutches are connected to a second oil port of the air-controlled reversing valve through a second pipeline; a proportional solenoid valve, arranged on a second pipeline; and an accumulator, arranged on the second pipeline and located between the proportional solenoid valve and the clutch.

[0005] Optionally, an accumulator is provided on each second pipeline.

[0006] Optionally, the hydraulic control system further includes a reversing valve, which is provided on the second pipeline and located downstream of the accumulator, and at least two clutches are connected to a working oil port of the reversing valve.

[0007] Optionally, the reversing valve is a two-position four-way reversing valve, and the two clutches are respectively connected to the two working oil ports of the reversing valve.

[0008] Optionally, there are three clutches and three second pipelines.

[0009] Optionally, a pressure regulating valve is provided between the air-controlled reversing valve and the oil pump.

[0010] Optionally, the two oil outlets of the pressure regulating valve are respectively connected to the first pipeline and the cooling and lubrication pipeline.

[0011] Optionally, a filter is provided between the oil pump and the pressure regulating valve.

[0012] The present invention also provides a transmission comprising the above-mentioned hydraulic control system.

[0013] The present invention also provides an engineering machine comprising the above-mentioned gearbox.

[0014] The present invention has the following advantages:

[0015] Utilizing the technical solution of the present invention, the hydraulic system employs an air-controlled reversing valve to control the oil supply to the clutch based on the ambient air pressure. Each second pipeline is equipped with an accumulator to absorb hydraulic shock from the clutch. Furthermore, the hydraulic control system utilizes a relatively small number of hydraulic components, resulting in a simple and cost-effective hydraulic control system. Thus, the technical solution of the present invention addresses the drawbacks of prior art transmission hydraulic systems, which suffer from complex structures and difficulty absorbing hydraulic shock from the clutch. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic structural diagram showing a first embodiment of the hydraulic control system of the present invention; and

[0018] Figure 2 FIG. 1 is a structural diagram of a second embodiment of a hydraulic control system of the present invention.

[0019] Description of reference numerals:

[0020] 10. Oil pump; 20. Air-controlled reversing valve; 30. First pipeline; 40. Clutch; 50. Second pipeline; 60. Proportional solenoid valve; 70. Accumulator; 80. Reversing valve; 90. Pressure regulating valve; 100. Cooling and lubrication pipeline; 110. Filter. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0024] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] Example 1

[0026] like Figure 1 As shown, the hydraulic control system of the transmission of the first embodiment includes an oil pump 10, an air-controlled reversing valve 20, multiple clutches 40, a proportional solenoid valve 60, and an accumulator 70. The oil pump 10 is connected to the first oil port of the air-controlled reversing valve 20 via a first pipeline 30. Multiple clutches 40 are arranged in parallel and connected to the second oil port of the air-controlled reversing valve 20 via a second pipeline 50. The proportional solenoid valve 60 is disposed on the second pipeline 50. The accumulator 70 is disposed on the second pipeline 50 and is located between the proportional solenoid valve 60 and the clutches 40.

[0027] Utilizing the technical solutions of this embodiment, in the hydraulic system described above, the air-controlled reversing valve 20 controls the oil supply to the clutch 40 based on the ambient air pressure. Each second pipeline 50 is provided with an accumulator 70, thereby absorbing hydraulic shocks from the clutch 40. Furthermore, the hydraulic control system comprises a relatively small number of hydraulic components, resulting in a simple and cost-effective hydraulic control system. Thus, the technical solutions of this embodiment address the drawbacks of conventional transmission hydraulic systems, which are complex in structure and difficult to absorb hydraulic shocks from the clutch.

[0028] In this embodiment, the oil pump 10 is adapted to be in communication with an external oil source, and the oil pump 10 can provide hydraulic oil to the hydraulic system.

[0029] In this embodiment, the pneumatically controlled reversing valve 20 switches direction based on the external air pressure, thereby supplying or releasing pressure to the clutch 40. Specifically, when the external air pressure is below a preset value, the valve core of the pneumatically controlled reversing valve 20 moves to the left position under the elastic force of the spring, allowing hydraulic oil to flow into the clutch 40. When the external air pressure exceeds the preset value, the pressure exerted on the valve core by the air pressure is greater than the elastic force of the spring, causing the valve core of the pneumatically controlled reversing valve 20 to move to the right position, releasing pressure from the clutch 40.

[0030] Furthermore, the magnitude of the external air pressure refers to the air pressure change caused by braking.

[0031] like Figure 1 As shown, in this embodiment, multiple second pipelines 50 are provided, and each second pipeline 50 is provided with a proportional solenoid valve 60. Those skilled in the art can understand that by energizing or de-energizing, the proportional solenoid valve 60 can be controlled to switch between the left position and the right position, thereby controlling the oil supply or pressure relief of the clutch 40 on the corresponding second pipeline 50.

[0032] like Figure 1 As shown, an accumulator 70 is provided on the second pipeline 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 more stable.

[0033] like Figure 1 As shown, in the technical solution of this embodiment, an accumulator 70 is provided on each second pipeline 50. Specifically, in this embodiment, multiple second pipelines 50 are provided, each corresponding to a clutch 40, and each second pipeline 50 is provided with an accumulator 70. The arrangement of the accumulators 70 ensures that the hydraulic shock generated by each clutch 40 can be absorbed by the accumulator 70.

[0034] like Figure 1 As shown, in the technical solution of this embodiment, there are three clutches 40 and three second pipelines 50. Specifically, the three second pipelines 50 are arranged in parallel, and each second pipeline 50 is connected to one clutch 40.

[0035] The specific number of clutches 40 can be adjusted according to the specific structure of the transmission.

[0036] like Figure 1 As shown, in the technical solution of this embodiment, a pressure regulating valve 90 is provided between the air-controlled reversing valve 20 and the oil pump 10. Specifically, the pressure regulating valve 90 is provided on the first pipeline 30. When the pressure in the first pipeline 30 exceeds a preset value, the pressure regulating valve 90 can relieve the pressure in the first pipeline 30, thereby ensuring that the pressure of the hydraulic system remains stable.

[0037] like Figure 1 As shown, in the technical solution of this embodiment, the two oil outlets of the pressure regulating valve 90 are connected to the first pipeline 30 and the cooling and lubrication pipeline 100, respectively. Specifically, the pressure regulating valve 90 is a two-position, three-way reversing valve, comprising an oil inlet and two oil outlets. The oil inlet is connected to the oil pump 10, and the two oil outlets are connected to the first pipeline 30 and the cooling and lubrication pipeline 100, respectively. One control end of the valve core of the pressure regulating valve 90 is connected to a spring, and the other control end is connected to the oil inlet via a pipeline.

[0038] When the pressure in the first pipeline 30 is lower than the preset pressure, the spring holds the valve core of the pressure regulating valve 90 in the left position. At this point, all the hydraulic oil pumped out by the oil pump 10 flows through the first pipeline into the clutch 40. When the pressure in the first pipeline 30 is higher than the preset value, the oil pressure exceeds the elastic force of the spring, causing the valve core of the pressure regulating valve 90 to move to the right position. At this point, part of the hydraulic oil pumped out by the oil pump 10 flows through the first pipeline 30 into the clutch, and the remaining part flows into the cooling and lubrication pipeline 100, thereby regulating the pressure of the first pipeline 30.

[0039] like Figure 1 As mentioned above, in the technical solution of this embodiment, a filter 110 is provided between the oil pump 10 and the pressure regulating valve 90. The filter 110 is provided on the first pipeline 30, and the filter can filter impurities in the hydraulic oil.

[0040] Example 2

[0041] like Figure 2 As shown, the hydraulic control system of the second embodiment differs from that of the first embodiment in that the hydraulic control system further includes a reversing valve 80, which is arranged on the second pipeline 50 and located downstream of the accumulator 70, and at least two clutches 40 are connected to the working oil port of the reversing valve 80.

[0042] Specifically, in the second embodiment, at least two of the multiple clutches 40 are arranged in parallel on a second pipeline 50. The reversing valve 80 is located between the accumulator 70 and the clutch 40. The reversing valve 80 controls the oil supply or pressure relief of each clutch 40.

[0043] like Figure 2 As described above, 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 the two working oil ports of the reversing valve 80. Specifically, when the reversing valve 80 is in the left position, the clutch 40 located on the upper side of the two clutches 40 releases pressure, while the clutch located on the lower side is supplied with oil. When the reversing valve 80 is in the right position, the clutch located on the upper side is supplied with oil, while the clutch located on the lower side releases pressure.

[0044] Of course, the number of clutches 40 connected in parallel to the same second pipeline 50 can be adaptively adjusted, and accordingly, the specific form of the reversing valve 80 can be adaptively adjusted.

[0045] This embodiment also provides a transmission, which includes the above-mentioned hydraulic control system.

[0046] This embodiment also provides an engineering machine, which includes the above-mentioned gearbox.

[0047] According to the above description, this patent application has the following advantages:

[0048] 1. The structure is simple, only three proportional solenoid valves or two proportional solenoid valves plus one reversing solenoid valve are needed to realize the oil supply and pressure relief of the transmission clutch;

[0049] 2. There is an accumulator behind each proportional solenoid valve, which can effectively absorb the hydraulic shock during the gear shifting process.

[0050] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A hydraulic control system for a gearbox, characterized in that: include: Oil pump (10); An air-controlled reversing valve (20), wherein the oil pump (10) is connected to a first oil port of the air-controlled reversing valve (20) via a first pipeline (30); A plurality of clutches (40), wherein the plurality of clutches (40) are arranged in parallel, and the clutches (40) are connected to the second oil port of the air-controlled reversing valve (20) through a second pipeline (50); a proportional solenoid valve (60), disposed on the second pipeline (50); an accumulator (70) disposed on the second pipeline (50) and located between the proportional solenoid valve (60) and the clutch (40); The pneumatically controlled reversing valve (20) is reversible according to the size of the external air pressure. When the external air pressure is less than a preset value, the valve core of the pneumatically controlled reversing valve (20) moves to the left position under the elastic force of the spring, and hydraulic oil can flow into the clutch (40); when the external air pressure is greater than the preset value, the valve core moves to the right position, and the clutch (40) is depressurized. The magnitude of the external air pressure is the air pressure change caused by braking.

2. The hydraulic control system according to claim 1, characterized in that: Each of the second pipelines (50) is provided with the accumulator (70).

3. The hydraulic control system according to claim 1 or 2, characterized in that: The hydraulic control system further comprises a reversing valve (80), which is arranged on the second pipeline (50) and located downstream of the accumulator (70), and at least two clutches (40) are connected to the working oil port of the reversing valve (80).

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

5. The hydraulic control system according to claim 1 or 2, characterized in that: There are three clutches (40) and three second pipelines (50).

6. The hydraulic control system according to claim 1 or 2, characterized in that: A pressure regulating valve (90) is provided between the air-controlled reversing 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) are respectively connected to the first pipeline (30) and the cooling and lubricating pipeline (100).

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, characterized in that: The hydraulic control system comprises the hydraulic control system according to any one of claims 1 to 7.

10. An engineering machine, characterized in that: Comprising a gearbox as claimed in claim 9.

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