A hydraulic integrated valve, hydraulic oil circuit and tractor

Abstract

The utility model provides a kind of hydraulic integrated valve, hydraulic oil circuit and tractor.The hydraulic integrated valve includes valve body, first oil circuit, second oil circuit, pressure reducing valve, first reversing valve, second reversing valve and third connecting port.The utility model realizes the flow of each oil port hydraulic oil on valve body by optimizing hydraulic integrated valve structure, saves the installation space of hydraulic integrated valve, does not need to additionally arrange pipeline, avoids the oil leakage failure and the problem of difficult disassembly maintenance caused by pipeline arrangement.In addition, the utility model sets pressure reducing valve in first oil circuit, the hydraulic oil entering first oil circuit is shunted into first reversing valve, second reversing valve and second connecting port by pressure reducing valve, to control the oil pressure stability of external oil supply of hydraulic integrated valve, while meeting the use demand of different working conditions.

Description

Technical Field

[0001] This utility model relates to agricultural machinery and equipment, and in particular to a hydraulic integrated valve, a hydraulic oil circuit, and a tractor. Background Technology

[0002] In tractors, power shifting and reversing are typically achieved using control valve assemblies. Different gears and directions require different hydraulic circuit connections. Executing these shifts and reversals necessitates multiple electronically controlled valves to deliver hydraulic oil to the corresponding clutches. Due to the large number of gears, installing connecting pipes between each electronically controlled valve and clutch not only easily leads to oil leaks but also results in a chaotic valve arrangement and hinders disassembly and maintenance, as current technologies do not integrate the brake valve assembly with the electronically controlled valve assembly. Therefore, it is necessary to provide an integrated hydraulic valve, hydraulic circuit, and tractor to overcome these shortcomings. Utility Model Content

[0003] The purpose of this invention is to provide a hydraulic integrated valve, a hydraulic circuit, and a tractor.

[0004] According to a first aspect of this utility model, a hydraulic integrated valve is provided, comprising: a valve body; a first oil passage disposed within the valve body, with an inlet port and a first connection port formed on the surface of the valve body at both ends; a second oil passage disposed within the valve body, with a first return port formed on the surface of the valve body at one end; a pressure reducing valve connected in series with the first oil passage; a first directional valve, with its inlet port connected to the outlet port of the pressure reducing valve, and its return port connected to the second oil passage, the first directional valve forming a first working port on the surface of the valve body; and a second directional valve, wherein the... The inlet of the first directional valve is connected to the outlet of the pressure reducing valve, and the return port of the second directional valve is connected to the second oil circuit. The second directional valve forms a second working port on the surface of the valve body. The second connection port is connected to the outlet of the pressure reducing valve. The first relief valve is connected in series in the first oil circuit. The inlet of the first relief valve is connected to the outlet of the pressure reducing valve, and the outlet of the first relief valve is connected to the first connection port. The hydraulic oil entering the first oil circuit is pressure-reduced and diverted by the pressure reducing valve into the first directional valve, the second directional valve, and the second connection port.

[0005] Preferably, it further includes a third connection port, which is connected to the oil outlet of the pressure reducing valve.

[0006] Preferably, it further includes: a second overflow valve, which is connected to the oil outlet of the first overflow valve, and the oil outlet of the second overflow valve forms a second return port on the valve body.

[0007] Preferably, the valve body includes a mounting surface that conforms to the gearbox, and the first oil return port and the second oil return port are located on the mounting surface.

[0008] Preferably, the pressure reducing valve is an adjustable pressure reducing valve.

[0009] Preferably, both the first reversing valve and the second reversing valve are two-position three-way electrically controlled valves.

[0010] According to a second aspect of this utility model, a hydraulic circuit is provided, comprising: an oil tank; a first oil pump connected to the oil tank; a shift valve assembly having the structure of the hydraulic integrated valve, wherein the oil inlet port is connected to the first oil pump, the first directional valve is connected to the first clutch, the second directional valve is connected to the second clutch, and the first return port and the second return port are connected to the oil tank; a brake valve assembly connected to the second connection port; an accumulator connected to the third connection port; a radiator oil inlet connected to the first connection port, and the radiator oil return port connected to the oil tank.

[0011] Preferably, the hydraulic circuit further includes: a second oil pump, the second oil pump being connected to the oil tank, and the oil outlet of the second oil pump being connected to the oil inlet of the radiator.

[0012] Preferably, the radiator includes a first oil inlet and a second oil inlet spaced a predetermined distance apart, the first oil inlet being connected to the second oil pump and the first oil inlet being connected to a first oil passage.

[0013] According to a third aspect of the present invention, an electric tractor is provided, including the aforementioned hydraulic integrated valve.

[0014] Compared with existing technologies, the hydraulic integrated valve, hydraulic circuit, and tractor provided by this utility model have the following beneficial effects: On the one hand, by optimizing the structure of the hydraulic integrated valve, this utility model enables the flow of hydraulic oil through each port on the valve body, saving installation space and eliminating the need for additional piping, thus avoiding oil leakage and difficulty in disassembly and maintenance caused by piping layout. On the other hand, a pressure reducing valve is installed in the first oil circuit, which reduces the pressure of the hydraulic oil entering the first oil circuit and diverts it to the first directional valve, the second directional valve, and the second connection port, thereby controlling the oil pressure supplied by the hydraulic integrated valve to be stable and meeting the usage requirements of different working conditions. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0016] Figure 1This is one of the schematic diagrams of the circuit principle of the hydraulic integrated valve in this utility model;

[0017] Figure 2 This is the second schematic diagram of the circuit principle of the hydraulic integrated valve in this utility model;

[0018] Figure 3 This is a schematic diagram of the hydraulic integrated valve in this utility model;

[0019] Figure 4 This is a front view of the hydraulic integrated valve in this utility model;

[0020] Figure 5 This is a right view of the hydraulic integrated valve in this utility model;

[0021] Figure 6 This is a left view of the hydraulic integrated valve in this utility model;

[0022] Figure 7 This is a rear view of the hydraulic integrated valve in this utility model;

[0023] Figure 8 This is a schematic diagram of the wiring connection of the hydraulic system in this utility model.

[0024] Explanation of reference numerals in the attached drawings: 1. Hydraulic integrated valve; 11. Valve body; 111. Mounting surface; 12. First oil circuit; 121. Oil inlet port; 122. First connection port; 123. Second connection port; 124. Third connection port; 13. Second oil circuit; 131. First return port; 14. Pressure reducing valve; 15. First directional valve; 151. First working port; 16. Second directional valve; 161. Second working port; 17. First relief valve; 18. Second relief valve; 181. Second return port; 2. Oil tank; 3. First oil pump; 4. Brake valve assembly; 5. Accumulator; 6. Radiator; 61. First oil inlet; 62. Second oil inlet; 7. Second oil pump. Detailed Implementation

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0027] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0028] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0031] Example 1

[0032] See Figures 1 to 7 This embodiment discloses a hydraulic integrated valve, which includes a valve body 11, a first oil passage 12, a second oil passage 13, a pressure reducing valve 14, a first directional valve 15, a second directional valve 16, and a third connection port 124.

[0033] See appendix Figure 1 , 2The first oil passage 12 is located inside the valve body 11, with an inlet port 121 and a first connection port 122 formed on the surface of the valve body 11 at both ends. The first oil passage 12 serves as the oil inlet passage, and the inlet port 121 is connected to the first oil pump 3 to supply hydraulic oil to the hydraulic integrated valve. The second oil passage 13 is the oil return passage, located inside the valve body 11, with a first return port 131 formed on the surface of the valve body 11 at one end, which can be connected to the oil tank 2.

[0034] See appendix Figure 1 , 2 The pressure reducing valve 14 is connected in series in the first oil circuit 12 to control the working pressure of the working actuators (such as clutches and cylinders) to stabilize. The pressure reducing valve 14 is an adjustable type; by adjusting the reset spring force of the adjustable pressure reducing valve 14, the user can meet the usage requirements of different working actuators, making the hydraulic integrated valve suitable for different requirements such as power reversing and power shifting.

[0035] See appendix Figure 1 , 2 The oil inlet of the first directional valve 15 is connected to the oil outlet of the pressure reducing valve 14, and the oil return port of the first directional valve 15 is connected to the second oil circuit 13. The first directional valve 15 forms a first working oil port 151 on the surface of the valve body 11. The oil inlet of the first directional valve 15 is connected to the oil outlet of the pressure reducing valve 14, and the oil return port of the second directional valve 16 is connected to the second oil circuit 13. The second directional valve 16 forms a second working oil port 161 on the surface of the valve body 11.

[0036] See appendix Figure 1 , 2 Both the first reversing valve 15 and the second reversing valve 16 are electrically controlled valves. Multiple electrically controlled valves are concentrated within a single valve body 11, allowing control of the hydraulic oil to be completed within the valve body 11. The number and type of electrically controlled valves can be configured according to the tractor's requirements for shifting, reversing, PTO connection, transfer case connection, etc. This embodiment uses electrically controlled reversing as an example. Both the first reversing valve 15 and the second reversing valve 16 are two-position three-way electrically controlled valves, enabling separate control of the two clutch components of the reversing clutch to meet the tractor's reversing requirements.

[0037] The second connection port 123 is connected to the oil outlet of the pressure reducing valve 14. During application, the second connection port 123 is connected to the brake valve assembly 4 to provide hydraulic oil to the brake cylinder, thereby realizing the mechanical braking of the tractor and thus enabling the tractor to stop and move.

[0038] The third connection port 124 is connected to the oil outlet of the pressure reducing valve 14. The third connection port 124 is connected to the accumulator 5. When the first oil pump 3 starts, hydraulic oil is injected into the accumulator 5 until the accumulator 5 is full of hydraulic oil, ensuring the stability of the oil pressure supplied to the external hydraulic integrated valve.

[0039] See appendix Figure 1 , 2 A first relief valve 17 is connected in series to the first oil passage 12. The inlet of the first relief valve 17 is connected to the outlet of the pressure reducing valve 14. The inlet of the second relief valve 18 is connected to the outlet of the first relief valve 17. The outlet of the second relief valve 18 forms a second return port 181 on the valve body 11. The first relief valve 17 and the second relief valve 18 directly overflow hydraulic oil to the oil tank 2, thereby stabilizing the pressure at the first connection port 122 and protecting subsequent hydraulic components, which in this embodiment is the radiator 6.

[0040] See appendix Figures 3 to 7 The valve body 11 includes a mounting surface 111 and a non-mounting surface 111 that conform to the gearbox. A first return oil port 131 and a second return oil port 181 are located on the mounting surface 111. By mounting the valve body 11 on the gearbox, communication between the hydraulic integrated valve and the clutch within the gearbox is achieved, enabling the return oil from the hydraulic integrated valve 1. A first working oil port 151 and a second working oil port 161 are provided on the non-mounting surface 111. These ports connect to actuators such as the clutch inside the gearbox, enabling functions such as gear shifting, reversing, PTO engagement, and four-wheel drive engagement. This design avoids the chaotic layout problems caused by the scattered and individual placement of electronically controlled valves in existing technologies, and also facilitates disassembly and maintenance.

[0041] Example 2

[0042] See appendix Figure 8 This embodiment provides a hydraulic circuit, including an oil tank 2, a first oil pump 3, a second oil pump 7, a shift valve group, a brake valve group 4, an accumulator 5, and a radiator 6.

[0043] The oil tank 2 is the gearbox. The first oil pump 3 is connected to the oil tank 2. The shift valve group has the structure of the hydraulic integrated valve in Embodiment 1. The oil inlet port 121 is connected to the first oil pump 3. The first reversing valve 15 is connected to the first clutch. The second reversing valve 16 is connected to the second clutch. The first return oil port 131 and the second return oil port 181 are connected to the oil tank 2. The brake valve group 4 is connected to the second connection port 123. The accumulator 5 is connected to the third connection port 124. The second oil pump 7 is connected to the oil tank 2. The oil outlet of the second oil pump 7 is connected to the oil inlet of the radiator 6. By combining active cooling and recirculation cooling, the temperature of the hydraulic oil in the gearbox is controlled.

[0044] The oil inlet of the radiator 6 is connected to the first connection port 122, and the oil return port of the radiator 6 is connected to the oil tank 2. The radiator 6 includes a first oil inlet 61 and a second oil inlet 62 spaced a predetermined distance apart. The first oil inlet 61 is connected to the second oil pump 7 and the first oil passage 12. By connecting the first connection port 122 of the shift valve assembly and the second oil pump 7 into the radiator 6 respectively, not only can the heat dissipation effect be improved, but the back pressure generated by direct convergence can also be avoided, which would cause the hydraulic oil to flow back to the shift valve assembly.

[0045] Example 3

[0046] This embodiment provides a tractor, including the hydraulic integrated valve of Embodiment 1.

[0047] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. A hydraulic integrated valve, characterized by, include Valve body; The first oil passage is located in the valve body, and its two ends form an oil inlet port and a first connection port on the surface of the valve body. The second oil passage is located in the valve body, and one end of the second oil passage forms a first oil return port on the surface of the valve body. A pressure reducing valve, which is connected in series in the first oil circuit; The first directional valve has its inlet connected to the outlet of the pressure reducing valve and its return port connected to the second oil circuit. The first directional valve forms a first working port on the surface of the valve body. The second directional valve has an oil inlet connected to the oil outlet of the pressure reducing valve, and an oil return port connected to the second oil circuit. The second directional valve forms a second working oil port on the surface of the valve body. The second connection port is connected to the oil outlet of the pressure reducing valve; A first relief valve is connected in series in the first oil circuit. The oil inlet of the first relief valve is connected to the oil outlet of the pressure reducing valve, and the oil outlet of the first relief valve is connected to the first connection port. The hydraulic oil entering the first oil circuit is depressurized and diverted by the pressure reducing valve into the first directional valve, the second directional valve, and the second connection port.

2. The hydraulic integrated valve as described in claim 1, characterized in that, Also includes: The third connection port is connected to the oil outlet of the pressure reducing valve.

3. The hydraulic integrated valve as described in claim 1, characterized in that, Also includes: The second relief valve is connected to the oil outlet of the first relief valve, and the oil outlet of the second relief valve forms a second return port on the valve body.

4. The hydraulic integrated valve as described in claim 1, characterized in that, The valve body includes a mounting surface that fits into the gearbox, and the first oil return port and the second oil return port are located on the mounting surface.

5. The hydraulic integrated valve as described in claim 1, characterized in that, The pressure reducing valve is an adjustable pressure reducing valve.

6. The hydraulic integrated valve as described in claim 1, characterized in that, Both the first and second directional valves are two-position three-way electrically controlled valves.

7. A hydraulic circuit, characterized in that, include: tank; A first oil pump, which is connected to the oil tank; A shift valve assembly having the structure of the hydraulic integrated valve as described in claim 2, wherein the oil inlet port is connected to a first oil pump, the first reversing valve is connected to a first clutch, the second reversing valve is connected to a second clutch, and the first return oil port and the second return oil port are connected to an oil tank. A brake valve assembly, wherein the brake valve assembly is connected to the second connection port; An energy storage device, which is connected to the third connection port; The radiator has an oil inlet connected to a first connection port and an oil return port connected to an oil tank.

8. The hydraulic circuit as described in claim 7, characterized in that, The hydraulic circuit also includes: The second oil pump is connected to the oil tank, and the oil outlet of the second oil pump is connected to the oil inlet of the radiator.

9. The hydraulic circuit as described in claim 8, characterized in that, The radiator includes a first oil inlet and a second oil inlet spaced a predetermined distance apart. The first oil inlet is connected to the second oil pump and to the first oil circuit.

10. A tractor, characterized in that, Includes the hydraulic integrated valve as described in any one of claims 1 to 6.

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