Wet clutch hydraulic oil way system and tractor

Abstract

The utility model discloses a wet clutch hydraulic oil way system and a tractor, the wet clutch hydraulic oil way system comprises an oil supply pipeline, an oil return pipeline and a pressure reducing valve, the pressure reducing valve is a pilot-operated type proportional pressure reducing valve, an oil inlet of the pressure reducing valve is communicated with the oil supply pipeline, and an oil outlet of the pressure reducing valve is communicated with the oil return pipeline. An oil return opening of the pressure reducing valve is communicated with the oil return pipeline, a working oil opening of the pressure reducing valve is used for being communicated with an oil opening corresponding to the wet clutch, and the pressure reducing valve is a pilot-operated type proportional pressure reducing valve, so that when pressure impact occurs at the moment when the wet clutch is switched to the transmission state, the wet clutch can be driven to rotate. At the moment, a pilot oil way of the pressure reducing valve can be opened firstly to release pressure, and a main valve of the pressure reducing valve acts subsequently to realize pressure reduction, so that instant pressure impact of the wet clutch can be eliminated, and stable starting is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of power shifting, in particular to a wet clutch hydraulic oil circuit system and a tractor. Background Art

[0002] Currently, there are two main types of control valves for the wet clutch in a tractor's power shift assembly: a direct-acting proportional valve and an on-off valve. The former can output varying pressures based on input current, but is relatively expensive, while the latter has only two states: open and closed, resulting in a simpler structure and lower cost. Direct-acting proportional valves are used to control the travel wet clutch and / or the PTO wet clutch, while on-off valves are used to control the four-wheel drive wet clutch and / or the differential wet clutch. When controlling the travel wet clutch, the current power shift assembly control valve generates a significant pressure surge during the tractor's starting phase. This causes the tractor to momentarily move forward a short distance before stopping and waiting, waiting for sufficient pressure to build up before continuing to move. This pressure surge results in an unsteady start, seriously impacting driver comfort. Furthermore, to protect the tractor, the power shift assembly typically incorporates a low-temperature protection strategy that restricts travel or speed when the tractor is first started in low temperatures. Therefore, in cold weather, it often takes a long time for the tractor to reach normal operating conditions upon initial startup. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a wet clutch hydraulic oil circuit system which has a simple structure and enables the tractor to start more smoothly.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a wet clutch hydraulic oil circuit system, including an oil supply pipeline, an oil return pipeline and a pressure reducing valve, the pressure reducing valve is a pilot proportional pressure reducing valve, the oil inlet of the pressure reducing valve is connected to the oil supply pipeline, the oil return port of the pressure reducing valve is connected to the oil return pipeline, and the working oil port of the pressure reducing valve is used to connect with the oil port corresponding to the wet clutch.

[0005] The beneficial effect of the above technical solution is that by adopting a pilot-type proportional pressure reducing valve for the pressure reducing valve, when a pressure shock occurs at the moment the wet clutch switches to the transmission state, the pilot oil circuit of the pressure reducing valve can be opened first to relieve the pressure, and its main valve then operates to achieve pressure reduction, thereby eliminating the instantaneous pressure shock of the wet clutch and achieving smooth starting.

[0006] In the above technical solution, there are multiple pressure reducing valves and wet clutches, and the multiple pressure reducing valves correspond one-to-one to the multiple wet clutches. The working oil port of each pressure reducing valve is connected to the oil port of the corresponding wet clutch.

[0007] The beneficial effect of the above technical solution is that the pressure reducing valve and the wet clutch can correspond one to one, so that multiple wet clutches on the tractor can be supplied with hydraulic oil by the pressure reducing valve.

[0008] In the above technical solution, an oil filter is further provided at the connection point between the pressure reducing valve and the oil supply pipeline.

[0009] The beneficial effect of the above technical solution is that the hydraulic oil introduced into the oil inlet of the pressure reducing valve can be filtered by the oil filter.

[0010] In the above technical solution, a first pressure measuring element is provided at the working oil port of the pressure reducing valve.

[0011] The beneficial effect of the above technical solution is that the oil pressure at the working oil port of the pressure reducing valve can be monitored by the first pressure measuring element.

[0012] In the above technical solution, a second pressure measuring element is provided at the oil outlet end of the oil supply pipeline.

[0013] The beneficial effect of the above technical solution is that the oil pressure at the oil inlet of the pressure reducing valve can be monitored by the second pressure measuring element.

[0014] In the above technical solution, the hydraulic oil of the oil supply pipeline is taken from the chassis oil tank, and the oil outlet end of the oil return pipeline is connected to the chassis oil tank.

[0015] The beneficial effect of the above technical solution is that the wet clutch hydraulic oil circuit system can share the chassis oil tank of the tractor, thereby making its structure more compact.

[0016] The above technical solution also includes a heat dissipation pipeline, the oil inlet end of the heat dissipation pipeline is connected to the oil supply pipeline, the oil inlet end of the heat dissipation pipeline is provided with a relief valve, the sensing oil port of the relief valve is connected to the oil return pipeline, the oil outlet end of the heat dissipation pipeline is connected to the chassis oil tank, and a radiator for dissipating heat to the hydraulic oil is provided on the heat dissipation pipeline.

[0017] The beneficial effect of the above technical solution is that when the oil pressure in the return oil pipeline is high, the overflow valve can be opened, so that part of the hydraulic oil in the oil supply pipeline can be cooled by the radiator on the heat dissipation pipeline and then flow back to the chassis oil tank, thereby reducing the oil pressure in the return oil pipeline and avoiding the high oil temperature in the chassis oil tank.

[0018] The above technical solution also includes a preheating pipeline, the oil inlet end of the preheating pipeline is connected to the heat dissipation pipeline, the oil outlet end of the preheating pipeline is connected to the chassis oil tank, the connection point between the preheating pipeline and the heat dissipation pipeline is located between the overflow valve and the radiator, and a bypass valve is provided on the preheating pipeline.

[0019] The beneficial effect of the above technical solution is that when the temperature of the hydraulic oil is low, part of the hydraulic oil in the heat dissipation pipeline can be directly discharged into the chassis oil tank through the preheating pipeline to increase the oil temperature in the chassis oil tank.

[0020] The bypass valve in the above technical solution is a temperature control valve.

[0021] The beneficial effect of the above technical solution is that when the oil temperature is low, most of the hydraulic oil in the heat dissipation pipeline is not dissipated, but is directly discharged into the chassis oil tank through the preheating pipeline to quickly increase the oil temperature in the chassis oil tank. This allows the tractor to respond more quickly when it is started for the first time in cold weather conditions.

[0022] A second object of the present invention is to provide a tractor with a simple structure and good stability when starting.

[0023] In order to achieve the above-mentioned purpose, another technical solution of the present invention is as follows: A tractor comprises the wet clutch hydraulic oil circuit system as described above.

[0024] The beneficial effects of the above technical solution are: its structure is simple and its operation stability is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a simplified structural diagram of the wet clutch hydraulic oil circuit system according to Example 1 of the present utility model;

[0026] Figure 2 This is a simplified structural diagram of the wet clutch hydraulic oil circuit system according to Example 2 of the present utility model;

[0027] Figure 3 This is a simplified structural diagram of the wet clutch hydraulic oil circuit system described in Example 3 of the present utility model.

[0028] In the figure: 1. Oil supply line; 2. Oil return line; 3. Pressure reducing valve; 4. Wet clutch; 5. Oil filter; 6. First pressure measuring element; 7. Second pressure measuring element; 8. Chassis oil tank; 9. Heat dissipation line; 10. Overflow valve; 11. Radiator; 12. Preheating line; 13. Bypass valve; 14. Oil pump. DETAILED DESCRIPTION

[0029] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention. The following paragraphs describe the present invention in more detail by way of example with reference to the accompanying drawings. The advantages and features of the present invention will be more clearly described according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in exact proportions. They are only used to facilitate and clearly illustrate the purpose of the embodiments of the present invention.

[0030] Example 1

[0031] like Figure 1 As shown, this embodiment provides a wet clutch hydraulic oil circuit system, including an oil supply pipeline 1, an oil return pipeline 2 and a pressure reducing valve 3, wherein the pressure reducing valve 3 is a pilot proportional pressure reducing valve, the oil inlet of the pressure reducing valve 3 is connected to the oil supply pipeline 1, the oil return port of the pressure reducing valve 3 is connected to the oil return pipeline 2, and the working oil port of the pressure reducing valve 3 is used to communicate with the oil port corresponding to the wet clutch 4. By adopting a pilot proportional pressure reducing valve as the pressure reducing valve, when the wet clutch switches to the transmission state and a pressure shock occurs, the pilot oil circuit of the pressure reducing valve can be opened first to release the pressure, and its main valve is then actuated to achieve pressure reduction, thereby eliminating the instantaneous pressure shock of the wet clutch and achieving smooth starting.

[0032] In the above technical solution, an oil filter 5 is further provided at the connection point between the pressure reducing valve 3 and the oil supply pipeline 1, so that the hydraulic oil entering the oil inlet of the pressure reducing valve can be filtered by the oil filter.

[0033] In the above technical solution, a first pressure measuring element 6 is provided at the working oil port of the pressure reducing valve 3, so that the first pressure measuring element can monitor the oil pressure at the working oil port of the pressure reducing valve; a second pressure measuring element 7 is provided at the oil outlet end of the oil supply pipeline 1, so that the second pressure measuring element can monitor the oil pressure at the oil inlet of the pressure reducing valve.

[0034] In the above technical solution, the hydraulic oil of the oil supply pipeline 1 is taken from the chassis oil tank 8 (in this embodiment, the oil inlet end of the oil supply pipeline is provided with an oil pump 14 for taking hydraulic oil from the chassis oil tank 8), and the oil outlet end of the oil return pipeline 2 is connected to the chassis oil tank 8. In this way, the wet clutch hydraulic oil circuit system shares the chassis oil tank of the tractor, making its structure more compact.

[0035] Example 2

[0036] Same as Example 1, except that Figure 2As shown, in the above technical solution, the pressure reducing valve 3 and the wet clutch 4 are both provided in plurality, and the plurality of pressure reducing valves 3 correspond one-to-one to the plurality of wet clutches 4. The working oil port of each pressure reducing valve 3 is respectively connected to the oil port of the corresponding wet clutch 4, so that the pressure reducing valve and the wet clutch can correspond one-to-one, so that the plurality of wet clutches on the tractor can be supplied with hydraulic oil by the pressure reducing valve.

[0037] Example 3

[0038] Same as Example 1 or Example 2, except that Figure 3 As shown, the above technical solution also includes a heat dissipation pipeline 9, the oil inlet end of the heat dissipation pipeline 9 is connected to the oil supply pipeline 1, and the oil inlet end of the heat dissipation pipeline 9 is provided with a relief valve 10, the induction oil port of the relief valve 10 is connected to the return oil pipeline 2, the oil outlet end of the heat dissipation pipeline 9 is connected to the chassis oil tank 8, and the heat dissipation pipeline 9 is provided with a radiator 11 for dissipating the heat of the hydraulic oil. In this way, when the oil pressure of the return oil pipeline is high, the relief valve can be opened at this time, so that part of the hydraulic oil in the oil supply pipeline can be cooled by the radiator on the heat dissipation pipeline and then flow back to the chassis oil tank, thereby reducing the oil pressure in the return oil pipeline, thereby avoiding the high oil temperature in the chassis oil tank.

[0039] The above technical solution also includes a preheating pipeline 12, the oil inlet end of the preheating pipeline 12 is connected to the heat dissipation pipeline 9, and the oil outlet end of the preheating pipeline 12 is connected to the chassis oil tank 8. The connection point between the preheating pipeline 12 and the heat dissipation pipeline 9 is located between the overflow valve 10 and the radiator 11, and a bypass valve 13 is provided on the preheating pipeline 12. In this way, when the oil temperature of the hydraulic oil is low, part of the hydraulic oil in the heat dissipation pipeline can be directly discharged into the chassis oil tank through the preheating pipeline to increase the oil temperature in the chassis oil tank.

[0040] The bypass valve 13 described in the above technical solution is a temperature control valve. When the temperature of the hydraulic oil is low, the bypass valve is fully opened, and the hydraulic oil in the heat dissipation pipeline does not pass through the radiator, but is directly discharged into the chassis oil tank through the bypass valve. When the oil temperature rises to a relatively high level, the bypass valve is fully closed. At this time, the hydraulic oil in the heat dissipation pipeline can directly pass through the radiator to dissipate heat and then enter the chassis oil tank. In this way, the hydraulic oil in the chassis oil tank can be quickly heated to a suitable temperature and remain relatively stable at this temperature, so that the tractor can quickly enter the operating condition when it is started for the first time in cold seasons.

[0041] The temperature control valve described in this embodiment can be set with two temperature thresholds, namely, an opening threshold and a closing threshold, wherein the opening threshold is lower than the closing threshold (the difference between the two can be 5°C or 10°C, which is set according to needs), and the temperature control valve has its own temperature sensor (the temperature sensor can be set in the chassis fuel tank). When the temperature in the chassis fuel tank is lower than the opening threshold, the temperature control valve opens. When the temperature in the chassis fuel tank is higher than the closing threshold, the temperature control valve closes.

[0042] Example 4

[0043] This embodiment provides a tractor, including the wet clutch hydraulic oil circuit system as described in Example 1, Example 2 or Example 3, which has a simple structure and good operational stability.

[0044] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any ordinary technician in this industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with this profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A wet clutch hydraulic oil circuit system, characterized in that: The invention comprises an oil supply pipeline (1), an oil return pipeline (2) and a pressure reducing valve (3), wherein the pressure reducing valve (3) is a pilot-operated proportional pressure reducing valve, the oil inlet of the pressure reducing valve (3) is connected to the oil supply pipeline (1), the oil return port of the pressure reducing valve (3) is connected to the oil return pipeline (2), and the working oil port of the pressure reducing valve (3) is used to communicate with the oil port corresponding to the wet clutch (4).

2. The wet clutch hydraulic oil circuit system according to claim 1, characterized in that: The pressure reducing valve (3) and the wet clutch (4) are both provided in plurality, and the plurality of pressure reducing valves (3) correspond one-to-one to the plurality of wet clutches (4), and the working oil port of each pressure reducing valve (3) is respectively connected to the oil port of the corresponding wet clutch (4).

3. The wet clutch hydraulic oil circuit system according to claim 1, characterized in that: An oil filter (5) is also provided at the connection point between the pressure reducing valve (3) and the oil supply pipeline (1).

4. The wet clutch hydraulic oil circuit system according to claim 1, characterized in that: A first pressure measuring element (6) is provided at the working oil port of the pressure reducing valve (3).

5. The wet clutch hydraulic oil circuit system according to claim 1, characterized in that: The oil outlet end of the oil supply pipeline (1) is provided with a second pressure measuring element (7).

6. The wet clutch hydraulic oil circuit system according to any one of claims 1 to 5, characterized in that: The hydraulic oil of the oil supply pipeline (1) is taken from the chassis oil tank (8), and the oil outlet end of the oil return pipeline (2) is connected to the chassis oil tank (8).

7. The wet clutch hydraulic oil circuit system according to claim 6, characterized in that: The heat dissipation system further comprises a heat dissipation pipeline (9), wherein the oil inlet end of the heat dissipation pipeline (9) is connected to the oil supply pipeline (1), the oil inlet end of the heat dissipation pipeline (9) is provided with a relief valve (10), the induction oil port of the relief valve (10) is connected to the oil return pipeline (2), the oil outlet end of the heat dissipation pipeline (9) is connected to the chassis oil tank (8), and a radiator (11) for dissipating heat from the hydraulic oil is provided on the heat dissipation pipeline (9).

8. The wet clutch hydraulic oil circuit system according to claim 7, characterized in that: The invention also includes a preheating pipeline (12), wherein the oil inlet end of the preheating pipeline (12) is connected to the heat dissipation pipeline (9), and the oil outlet end of the preheating pipeline (12) is connected to the inside of the chassis oil tank (8). The connection point between the preheating pipeline (12) and the heat dissipation pipeline (9) is located between the overflow valve (10) and the radiator (11), and a bypass valve (13) is provided on the preheating pipeline (12).

9. The wet clutch hydraulic oil circuit system according to claim 8, characterized in that: The bypass valve (13) is a temperature control valve.

10. A tractor, characterized in that: It comprises a wet clutch hydraulic oil circuit system as described in any one of claims 1 to 9.

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