Automatic transmission hydraulic control systems and operating equipment

Abstract

The present application relates to the field of transmission hydraulic control technology, and provides an automatic transmission hydraulic control system and operating equipment. The automatic transmission hydraulic control system includes: a first hydraulic pump; a main hydraulic pipeline, the main hydraulic pipeline is connected to the first hydraulic pump; a first pressure unit, the first pressure unit is connected to the main hydraulic pipeline; an overflow device; a second pressure unit, the second pressure unit is connected to the main hydraulic pipeline through the overflow device, so that the main hydraulic pipeline switches between the first pressure state and the second pressure state. The present application adopts the first hydraulic pump as a single pump to supply oil, and is connected between the main hydraulic pipeline and the second pressure unit through the overflow device, which can meet the needs of both the first pressure unit and the second pressure unit, so that the automatic transmission hydraulic control system has a simple structure and reliable performance.

Description

Technical Field

[0001] The present application belongs to the technical field of transmission hydraulic control, and in particular, relates to an automatic transmission hydraulic control system and operating equipment. Background Art

[0002] In the related art, the hybrid transmission hydraulic system uses dual pumps as the oil source for the main oil circuit and the lubrication oil circuit respectively, and cooperates with high and low pressure circuits to achieve energy saving of the transmission hydraulic system, but the structure is complex and the reliability is low. Summary of the invention

[0003] The embodiments according to the present invention are intended to solve or improve the above technical problems.

[0004] A first object according to an embodiment of the present invention is to provide an automatic transmission hydraulic control system.

[0005] A second object of an embodiment of the present invention is to provide a working device.

[0006] To achieve the first purpose of an embodiment of the present invention, the technical solution of the present invention provides an automatic transmission hydraulic control system, including: a first hydraulic pump; a main hydraulic pipeline, the main hydraulic pipeline is connected to the first hydraulic pump; a first pressure part, the first pressure part is connected to the main hydraulic pipeline; a second pressure part; an overflow device; a second pressure part, the second pressure part is connected to the main hydraulic pipeline through the overflow device, so that the main hydraulic pipeline can switch between a first pressure state and a second pressure state.

[0007] In this technical solution, the first hydraulic pump can be used as a pressure source to provide pressure liquid to the main hydraulic pipeline. The liquid input into the main hydraulic pipeline through the first hydraulic pump is a liquid with a certain pressure, which is connected between the main hydraulic pipeline and the second pressure part through an overflow device, so that the liquid entering the first pressure part can meet the needs of work or action, and the pressure state of the main hydraulic pipeline is the first pressure state. The excess liquid after consumption of the main hydraulic pipeline enters the second pressure part through the overflow device, so that the liquid entering the second pressure part after decompression can meet the needs, and the pressure state of the main hydraulic pipeline is the second pressure state. By using the first hydraulic pump as a single pump to supply oil, it can meet the needs of both the first pressure part and the second pressure part. The main hydraulic pipeline switches between the first pressure state and the second pressure state, so that the automatic transmission hydraulic control system has a simple structure and reliable performance.

[0008] In addition, the technical solution provided according to the embodiment of the present invention may also have the following additional technical features:

[0009] In the above technical solution, the overflow device includes: a throttling element, the throttling element is provided with a throttling inlet and a throttling outlet, and the throttling inlet is connected to the main hydraulic pipeline; a hydraulic control valve, the hydraulic control valve is provided with a liquid inlet and a liquid outlet, and the liquid inlet is connected to the throttling outlet; an overflow valve group, the overflow valve group is provided with an overflow inlet, an overflow pilot port, a first overflow outlet and a second overflow outlet, and the overflow inlet is connected to the main hydraulic pipeline; a pilot line, the pilot line is connected between the liquid outlet and the overflow pilot port; wherein the second pressure part includes a radiator, the radiator is connected to a lubrication pipeline, and the radiator is connected to the first overflow outlet through the heat dissipation pipeline, and the second overflow outlet is connected to the lubrication pipeline.

[0010] In this technical solution, the throttling element can reduce the pressure of the liquid entering the throttling element from the throttling inlet. The pilot line is connected between the liquid outlet of the hydraulic control valve and the overflow pilot port of the overflow valve group, so that after the hydraulic control valve is opened, the pilot line is connected to the first liquid storage tank through the hydraulic control valve, and the overflow pilot port has no pressure feedback, so that the opening pressure of the overflow valve group can be adjusted, so that the opening pressure of the overflow valve group is relatively small. When the opening pressure of the overflow valve group is relatively small, more liquid can enter from at least one overflow inlet of the overflow valve group, and then flow out from the first overflow outlet and the second overflow outlet into the second pressure part, wherein part of the liquid enters the heat dissipation pipeline through the first overflow outlet, so as to be able to dissipate heat for the radiator, thereby meeting the heat dissipation requirements of the automatic transmission, and most of the oil directly overflows to the lubrication pipeline through the second overflow outlet, while meeting the heat dissipation requirements, by reducing the flow resistance, further reducing the system pressure, thereby reducing the power consumption of the hydraulic system. The liquid enters the lubrication pipeline through the second overflow outlet, so as to be able to lubricate the pipeline or parts that need to be lubricated and are connected to the heat dissipation pipeline, thereby meeting the lubrication requirements. At this time, the pressure state of the main hydraulic pipeline is the second pressure state, and the second pressure state is a low pressure state. After closing the hydraulic control valve, the liquid entering the hydraulic control valve through the throttling element can enter the overflow pilot port of the overflow valve group. The overflow pilot port has pressure feedback, so that the opening pressure of the overflow valve group can be adjusted, so that the opening pressure of the overflow valve group is relatively large. When the opening pressure of the overflow valve group is relatively large, the hydraulic oil of the main hydraulic pipeline meets the needs of the first pressure part, and the remaining hydraulic oil enters the second pressure part through the overflow device to participate in heat dissipation and lubrication, thereby achieving the purpose of reducing the loss of the main hydraulic pipeline. Among them, the hydraulic oil flowing through the radiator also enters the lubrication pipeline to participate in lubrication, thereby achieving the purpose of further reducing losses. Specifically, all the remaining hydraulic oil is distributed to each lubrication point after being dissipated by the radiator, which can meet the needs of high-power heat dissipation and lubrication.

[0011] In any of the above technical solutions, the overflow valve group includes: a first overflow valve and a second overflow valve, the first overflow valve is provided with an overflow inlet and an overflow pilot port, and the first overflow outlet is provided on the first overflow valve, the second overflow outlet is provided on the second overflow valve, and the pilot line is connected between the liquid outlet and the two overflow pilot ports; or the overflow valve group includes a third overflow valve, the third overflow valve is provided with an overflow inlet and an overflow pilot port, and the first overflow outlet and the second overflow outlet are respectively provided on the second overflow valve.

[0012] In this technical solution, the first relief valve and the second relief valve are connected to the main hydraulic pipeline through their respective overflow inlets, so that the liquid can enter the first relief valve and the second relief valve respectively. The pilot line is connected to the main hydraulic pipeline through the hydraulic control valve, and the pressure state of the main hydraulic pipeline is high pressure. When the power consumption of the first pressure part needs to be reduced and the heat dissipation demand is small, the hydraulic control valve is opened, the pilot line connects the passage between the hydraulic control valve and the first relief valve, and the pilot line connects the passage between the hydraulic control valve and the second relief valve, and the pilot line is connected to the first liquid storage tank through the hydraulic control valve, and the pressure state of the main hydraulic pipeline is low pressure, so that the hydraulic oil can enter the first relief valve and the second relief valve respectively through the liquid outlet. By opening the hydraulic control valve, part of the oil in the main hydraulic pipeline can be controlled to overflow to the second pressure part through the first relief valve, and most of the oil overflows directly to the lubrication pipeline through the second relief valve. While meeting the heat dissipation demand, the system pressure is further reduced by reducing the flow resistance, thereby reducing the power consumption of the hydraulic system.

[0013] In any of the above technical solutions, the first pressure part includes: a gear clutch part, the gear clutch part includes a gear switch valve and a gear clutch, the gear switch valve is provided with a gear liquid inlet, a gear liquid outlet and a gear pilot port, the gear liquid inlet is connected to the main hydraulic pipeline, and at least a part of the gear clutch is connected to the gear liquid outlet; a parking clutch part, the parking clutch part includes a parking control valve, and the parking control valve is provided with a parking liquid outlet; a parking gear pipeline, the parking gear pipeline is connected between the parking liquid outlet and the gear pilot port.

[0014] In this technical solution, since the gear clutch and the parking clutch are connected in parallel on the main hydraulic pipeline, when the parking control valve fails, it is easy for the parking gear and the driving gear to be engaged at the same time, damaging the transmission mechanism and having low reliability. Therefore, the interlocking of the parking gear and the driving gear is achieved through the parking gear pipeline, which can avoid the parking gear being engaged incorrectly when the parking control valve, control circuit, program, etc. fail, thereby improving the reliability of the automatic transmission hydraulic control system.

[0015] In any of the above technical solutions, the automatic transmission hydraulic control system also includes: an energy storage valve group, which is provided with an energy storage inlet and outlet; wherein, the parking control valve is provided with a parking inlet, the parking inlet is connected to the main hydraulic pipeline, and the parking inlet is connected to the energy storage inlet and outlet.

[0016] In this technical solution, the energy storage inlet and outlet of the energy storage valve group is connected between the first one-way valve and the parking control valve. When the parking control valve is closed, the parking clutch is depressurized, and the parking clutch is engaged under the action of the reset spring to achieve parking, while the energy storage valve group maintains pressure. When the main oil circuit is used as the single pressure oil source for the parking clutch, the main hydraulic pipeline will cause pressure problems due to factors such as gear shifting and occasional jamming of the parking control valve, which may cause the parking clutch to suddenly lock, damage the transmission mechanism, and even cause safety accidents at high speeds, reducing reliability. Therefore, a dual oil source is formed by the energy storage valve group and the main hydraulic pipeline, and the dual oil sources supply oil to the parking clutch at the same time, which improves the disengagement response speed of the parking clutch and enables quick exit from the parking gear.

[0017] In any of the above technical solutions, the energy storage valve group includes: an accumulator; an energy storage control valve, which is connected to the accumulator; a pressure sensor, which is connected to the parking outlet, and the pressure sensor is communicatively connected to the energy storage control valve; wherein the energy storage inlet and outlet are arranged on the accumulator, a first one-way valve is arranged between the parking control valve and the main hydraulic pipeline, and the first one-way valve is arranged between the energy storage control valve and the main hydraulic pipeline.

[0018] In this technical solution, the pressure sensor can detect the pressure of the hydraulic oil entering the parking clutch. The opening or closing of the accumulator control valve can be controlled according to the pressure value detected by the pressure sensor, and the opening or closing of the parking control valve can be controlled, and the first one-way valve is cooperated to make the accumulator maintain pressure or release pressure. When the accumulator releases pressure, the accumulator constitutes the second oil source of the parking clutch, so that the accumulator and the main hydraulic pipeline form a dual oil source, and the dual oil sources supply oil to the parking clutch at the same time, which improves the disengagement response speed of the parking clutch and can quickly exit the parking gear.

[0019] In any of the above technical solutions, the first pressure unit also includes: a differential clutch unit, which includes a differential clutch, a differential control valve and a pressure reducing valve, and the pressure reducing valve is connected to the main hydraulic pipeline or the gear switch valve through the differential pipeline.

[0020] In this technical solution, the differential control valve and the differential clutch are connected in series, and the pressure reducing valve is used to reduce the pressure of the hydraulic pressure entering the differential control valve. The hydraulic pressure entering the pressure reducing valve comes from the main hydraulic pipeline, or the hydraulic pressure entering the pressure reducing valve comes from the hydraulic oil between the gear clutch and the gear switch valve, so that the differential clutch and the gear clutch share the same oil circuit, and the differential clutch and the parking clutch can be interlocked.

[0021] In any of the above technical solutions, the automatic transmission hydraulic control system also includes: a hydraulic source, the hydraulic source includes: a first liquid storage tank; a second hydraulic pump, the second hydraulic pump is provided with a pump inlet and a pump outlet, the pump inlet is connected to the first liquid storage tank; a second liquid storage tank, the second liquid storage tank is connected to the pump outlet; wherein, the first hydraulic pump is connected to the second hydraulic pump, and the first hydraulic pump is connected to the second liquid storage tank.

[0022] In this technical solution, the hydraulic source is used to input liquid into the main hydraulic pipeline through the first hydraulic pump. The second hydraulic pump sucks liquid from the first liquid storage tank through the pump inlet, and the second hydraulic pump inputs liquid into the second liquid storage tank through the pump outlet. The second hydraulic pump pumps the oil in the first liquid storage tank to the second liquid storage tank, which can ensure the oil volume of the second liquid storage tank.

[0023] In any of the above technical solutions, the hydraulic source also includes: an overflow pipeline, and the overflow pipeline is connected between the first liquid storage tank and the second liquid storage tank.

[0024] In this technical solution, excess oil overflows from the second liquid storage tank back to the first liquid storage tank through the overflow pipeline, which can ensure the liquid level of the second liquid storage tank and prevent the first liquid storage tank from being sucked empty, thereby ensuring the reliability of the system.

[0025] To achieve the second purpose of an embodiment of the present invention, the technical solution of the present invention provides an operating equipment, including: an equipment body; an automatic transmission hydraulic control system in any technical solution; at least a part of the first pressure part is arranged on the equipment body, and at least a part of the second pressure part is arranged on the equipment body.

[0026] In this technical solution, the working equipment provided according to the embodiment of the present invention includes the automatic transmission hydraulic control system according to any technical solution of the invention, and thus it has all the beneficial effects of the automatic transmission hydraulic control system according to any embodiment of the invention.

[0027] Additional aspects and advantages of embodiments according to the present invention will become apparent in the following description or may be learned through practice of embodiments according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the embodiments of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 It is a structural schematic diagram of an automatic transmission hydraulic delivery system in the related art;

[0030] Figure 2 One of the structural schematic diagrams of the automatic transmission hydraulic control system according to some embodiments of the present invention;

[0031] Figure 3 The second structural schematic diagram of the automatic transmission hydraulic control system according to some embodiments of the present invention;

[0032] Figure 4 The third structural schematic diagram of the automatic transmission hydraulic control system according to some embodiments of the present invention;

[0033] Figure 5 This is a fourth structural schematic diagram of an automatic transmission hydraulic control system according to some embodiments of the present invention;

[0034] Figure 6 Schematic diagram 5 of the structure of the automatic transmission hydraulic control system according to some embodiments of the present invention;

[0035] Figure 7 for Figure 6 A is an enlarged schematic diagram;

[0036] Figure 8 Schematic diagram of the composition of operating equipment according to some embodiments of the present invention.

[0037] in, Figure 1 The corresponding relationship between the reference numerals and component names in the figure is:

[0038] 100′: Automatic transmission hydraulic system.

[0039] in, Figures 2 to 8 The corresponding relationship between the reference numerals and component names in the figure is:

[0040] 10: Operating equipment; 100: Automatic transmission hydraulic control system; 110: First hydraulic pump; 120: Main hydraulic pipeline; 130: First pressure unit; 1302: Shift clutch pipeline; 1304: Parking clutch pipeline; 132: Shift clutch unit; 1310: Shift clutch; 1312: First shift clutch; 1314: Second shift clutch; 1320: Shift switch valve; 1322: Shift fluid inlet; 1324: Shift fluid outlet; 1326: Shift pilot port; 134: Parking Clutch unit; 1340: parking control valve; 1342: parking fluid inlet; 1344: parking fluid outlet; 1330: parking clutch; 136: parking gear pipeline; 138: differential clutch unit; 1382: differential clutch; 1384: differential control valve; 1386: pressure reducing valve; 1388: differential pipeline; 140: second pressure unit; 142: heat dissipation pipeline; 144: radiator; 146: second one-way valve; 148: lubrication pipeline; 1410: third one-way valve; 150: overflow device ;1502 overflow inlet;1504: overflow pilot port;1506: first overflow outlet;1508: second overflow outlet;152: throttling element;1522: throttling inlet;1524: throttling outlet;154: hydraulic control valve;1542: liquid inlet;1544: liquid outlet;156: overflow valve group;1562: first overflow valve;1564: second overflow valve;1566: third overflow valve;158: pilot line;160: accumulator valve group;1602: accumulator inlet and outlet;16 2: accumulator; 164: accumulator control valve; 166: pressure sensor; 168: first one-way valve; 170: hydraulic source; 1700: first suction filter; 1702: first suction pipeline; 1704: pump liquid pipeline; 1706: second suction pipeline; 1710: second suction filter; 172: first liquid storage tank; 174: second hydraulic pump; 1742: pump liquid inlet; 1744: pump liquid outlet; 176: second liquid storage tank; 178: overflow pipeline; 180: filter press; 200: equipment body. DETAILED DESCRIPTION

[0041] In order to more clearly understand the above-mentioned purposes, features and advantages of the embodiments of the present invention, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0042] In the related prior art, such as Figure 1As shown, an automatic transmission hydraulic system 100' is disclosed. The automatic transmission hydraulic system 100' is a gearbox hydraulic system. The automatic transmission hydraulic system 100' has a main oil circuit and a cooling lubricating oil circuit, multiple gear clutches and a parking clutch, and is connected and disconnected with the lubricating oil circuit through a solenoid valve. Among them, the automatic transmission hydraulic system 100′ adopts the main oil circuit as a single pressure oil source for the parking clutch, and adopts the gear clutch module and the parking clutch module to be connected in parallel on the main oil circuit. The large torque transmission parking system is mainly a hydraulically driven parking system. The above hydraulic system has the following disadvantages: 1) Two pumps are required to supply oil to the parallel main oil circuit and the cooling and lubricating oil circuit respectively, and the connection and disconnection with the lubricating oil circuit are controlled by the switch solenoid valve, which has a complex structure and low reliability; 2) The main oil circuit is used as a single pressure oil source for the parking clutch. When the main oil circuit pressure "drops" due to factors such as gear shifting and occasional valve jamming, the parking brake clutch will suddenly lock, damage the transmission mechanism, and even safety accidents will occur at high speeds, and the reliability is low; 3) The gear clutch module and the parking clutch module are connected in parallel on the main oil circuit. When the solenoid valve, control circuit, program, etc. fail, it is easy to engage the parking gear and the driving gear at the same time, damaging the transmission mechanism, and the reliability is low.

[0043] Refer to the following Figures 2 to 8 An automatic transmission hydraulic control system 100 and a working device 10 according to some embodiments of the present invention are described.

[0044] Example 1

[0045] like Figure 2 As shown, this embodiment provides an automatic transmission hydraulic control system 100, including: a first hydraulic pump 110, a main hydraulic pipeline 120, a first pressure part 130, a second pressure part 140 and an overflow device 150. The main hydraulic pipeline 120 is connected to the first hydraulic pump 110. The first pressure part 130 is connected to the main hydraulic pipeline 120. The overflow device 150 is arranged between the main hydraulic pipeline 120 and the second pressure part 140, so that the main hydraulic pipeline 120 provides pressure liquid to the second pressure part 140 through the overflow device 150. The second pressure part 140 is connected to the main hydraulic pipeline 120 through the overflow device 150, so that the main hydraulic pipeline 120 can switch between a first pressure state and a second pressure state, wherein the pressure of the main hydraulic pipeline 120 in the first pressure state is different from the pressure of the main hydraulic pipeline 120 in the second pressure state, such as the first pressure state is a high pressure state, and correspondingly, the second pressure state is a low pressure state.

[0046] In this embodiment, the first hydraulic pump 110 can be used as a pressure source to provide pressure liquid to the main hydraulic pipeline 120. For example, the pressure liquid can be hydraulic oil. The first pressure part 130 can be a high-pressure part, which is generally a collection of valves, components, pipelines and parts that produce certain actions under high-pressure liquid or produce certain effects through high-pressure liquid. Similarly, the second pressure part 140 can be a low-pressure part, which is generally a collection of valves, components, pipelines and parts that can produce certain actions under low-pressure liquid or produce certain effects through low-pressure liquid. The liquid input into the main hydraulic pipeline 120 through the first hydraulic pump 110 is a liquid with a certain pressure, which is connected between the main hydraulic pipeline 120 and the second pressure part 140 through the overflow device 150. The overflow device 150 is used to adjust the pressure and overflow the main hydraulic pipeline 120 to achieve the switching of the main hydraulic pipeline 120 between the high-pressure state and the low-pressure state.

[0047] The working principle of the present invention is that the overflow device 150 has different opening pressures. When the opening pressure of the overflow device 150 is relatively large, the high-pressure liquid entering the first pressure part 130 can meet the needs of work or action. A small amount of high-pressure liquid consumed in the main hydraulic pipeline 120 enters the second pressure part 140 through the overflow device 150. The liquid entering the second pressure part 140 after decompression can meet the needs. At this time, the pressure state of the main hydraulic pipeline is the first pressure state, and the first pressure state is a high-pressure state. When the opening pressure of the overflow device 150 is relatively small, part of the liquid enters the second pressure part 140 through the overflow device 150. At this time, the pressure state of the main hydraulic pipeline is the second pressure state, and the second pressure state is a low-pressure state.

[0048] Since the prior art uses dual pumps to supply oil to the parallel main oil circuit and the cooling lubricating oil circuit respectively, and the connection and disconnection with the lubricating oil circuit are controlled by a switch solenoid valve, the structure is complex and the reliability is low. Therefore, this embodiment uses the first hydraulic pump 110 as a single pump to supply oil, so that the liquid entering the main hydraulic pipeline 120 is diverted to enter the first pressure part 130, and enters the second pressure part 140 through the overflow device 150, which can meet the needs of both the first pressure part 130 and the second pressure part 140, so that the automatic transmission hydraulic control system 100 has a simple structure and reliable performance.

[0049] Example 2

[0050] like Figure 3 As shown, this embodiment provides an automatic transmission hydraulic control system 100. In addition to the technical features of the above embodiments, this embodiment also includes the following technical features:

[0051] The overflow device 150 includes: a throttling element 152, a hydraulic control valve 154, a relief valve group 156 and a pilot line 158. The throttling element 152 is provided with a throttling inlet 1522 and a throttling outlet 1524. The throttling inlet 1522 is connected to the main hydraulic pipeline 120. The hydraulic control valve 154 is provided with a liquid inlet 1542 and a liquid outlet 1544. The liquid inlet 1542 is connected to the throttling outlet 1524. The relief valve group 156 is provided with at least one relief inlet 1502, a relief pilot port 1504, a first relief outlet 1506 and a second relief outlet 1508. At least one relief inlet 1502 is connected to the main hydraulic pipeline 120. The pilot line 158 is connected between the liquid outlet 1544 and the relief pilot port 1504. The second pressure portion 140 includes a radiator 144 , the radiator 144 is connected to a lubrication pipeline 148 , and the radiator 144 is connected to the first overflow outlet 1506 through the heat dissipation pipeline 142 , and the second overflow outlet 1508 is connected to the lubrication pipeline 148 .

[0052] In this embodiment, the overflow device 150 is mainly composed of a throttling element 152, a hydraulic control valve 154, a relief valve group 156 and a pilot line 158. The throttling element 152 may be a damping hole, the diameter of which is smaller than the inner diameter of the main hydraulic line 120, so that the fluid flow rate is slowed down and the flow rate is reduced, which plays a damping role, so that the pressure of the liquid entering the throttling element 152 from the throttling inlet 1522 can be reduced. The hydraulic control valve 154 is a normally open solenoid valve, that is, under normal circumstances, the hydraulic control valve is in an open state. The overflow valve group 156 is provided with an overflow pilot port 1504, and the pilot line 158 is connected between the liquid outlet 1544 of the hydraulic control valve 154 and the overflow pilot port 1504 of the overflow valve group 156, so that after the hydraulic control valve 154 is opened, the pilot line 158 is connected to the first liquid storage tank 172 through the hydraulic control valve 154, and the overflow pilot port 1504 has no pressure feedback, so that the opening pressure of the overflow valve group 156 can be adjusted, so that the opening pressure of the overflow valve group 156 is smaller. When the opening pressure of the overflow valve group 156 is relatively low, more liquid can enter from at least one overflow inlet 1502 of the overflow valve group 156, and then flow out from the first overflow outlet 1506 and the second overflow outlet 1508 to enter the second pressure portion 140, wherein part of the liquid enters the heat dissipation pipeline 142 through the first overflow outlet 1506, so that the liquid flowing through the heat dissipation pipeline 142 can be cooled by the radiator 144, thereby meeting the heat dissipation requirements of the automatic transmission, and most of the oil directly overflows to the lubrication pipeline 148 through the second overflow valve 1564, while meeting the heat dissipation requirements, by reducing the flow resistance, further reducing the system pressure, thereby reducing the power consumption of the hydraulic system, and the radiator 144 is provided with a second check valve 146 in parallel. The liquid enters the lubrication pipeline 148 through the second overflow outlet 1508, so that the pipeline or parts that need to be lubricated and are connected to the heat dissipation pipeline 142 can be lubricated, thereby meeting the lubrication requirements. At this time, the pressure state of the main hydraulic pipeline is the second pressure state, and the second pressure state is a low pressure state. After closing the hydraulic control valve 154, the liquid entering the hydraulic control valve 154 through the throttling element 152 can enter the overflow pilot port 1504 of the overflow valve group 156. The overflow pilot port 1504 has pressure feedback, so that the opening pressure of the overflow valve group 156 can be adjusted, so that the opening pressure of the overflow valve group 156 is relatively large. When the opening pressure of the overflow valve group 156 is relatively large, after the hydraulic oil of the main hydraulic pipeline 120 meets the needs of the first pressure part 130, the remaining hydraulic oil enters the second pressure part 140 through the overflow device 150 to participate in heat dissipation and lubrication, thereby achieving the purpose of reducing the loss of the main hydraulic pipeline 120, that is, the excess high-pressure liquid after the main hydraulic pipeline 120 is consumed enters the second pressure part 140 through the overflow device 150. At this time, the pressure state of the main hydraulic pipeline is the first pressure state, and the first pressure state is a high pressure state. The hydraulic oil flowing through the radiator 144 also enters the lubrication pipeline 148 to participate in lubrication, thereby achieving the purpose of further reducing losses.The lubrication line 148 includes a clutch lubrication oil passage and a shaft gear lubrication oil passage.

[0053] When the automatic transmission hydraulic control system 100 is in use, for example, in a driving state, when the transmission needs to transmit torque at high pressure and generates a large amount of heat, the hydraulic control valve 154 can be closed to control the pressure of the main hydraulic pipeline 120 to be high pressure, and all the excess oil after consumption in the main hydraulic pipeline 120 overflows to the second pressure part 140 through the overflow valve group 156, which can meet the needs of the first pressure part 130 and the second pressure part 140 at the same time. Among them, by closing the main hydraulic control valve 154, the pressure of the main hydraulic pipeline 120 can be controlled to be high pressure and maintain pressure stability, which can improve the service life of the first pressure part 130. When it is necessary to reduce the power consumption of the first pressure part 130, the hydraulic control valve 154 is opened to control the pressure reduction of the main hydraulic pipeline 120, and part of the oil overflows to the second pressure part 140 through the overflow valve group 156. By reducing the flow resistance, the system pressure is further reduced, thereby achieving the purpose of further reducing the power consumption of the hydraulic system.

[0054] In this embodiment, the automatic transmission hydraulic control system 100 can be applied to a grader. The driving load of the grader is complex and changeable. By closing the hydraulic control valve 154, the pressure of the main hydraulic pipeline 120 can be controlled to be high pressure and maintain pressure stability, thereby avoiding clutch slippage and increasing the service life of the clutch.

[0055] Example 3

[0056] like Figure 3 and Figure 6 As shown, this embodiment provides an automatic transmission hydraulic control system 100. In addition to the technical features of the above embodiments, this embodiment also includes the following technical features:

[0057] The overflow valve group 156 includes a first overflow valve 1562 and a second overflow valve 1564, the first overflow valve 1562 is provided with an overflow inlet 1502 and an overflow pilot port 1504, and the first overflow outlet 1506 is provided on the first overflow valve 1562, the second overflow outlet 1508 is provided on the second overflow valve 1564, and the pilot line 158 is connected between the liquid outlet 1544 and the two overflow pilot ports 1504; or the overflow valve group 156 includes a third overflow valve 1566, the third overflow valve 1566 is provided with an overflow inlet 1502 and an overflow pilot port 1504, and the first overflow outlet 1506 and the second overflow outlet 1508 are respectively provided on the third overflow valve 1566.

[0058] In this embodiment, the relief valve group 156 may include a first relief valve 1562 and a second relief valve 1564. Figure 3 and Figure 4As shown, the first relief valve 1562 and the second relief valve 1564 have the same structure. Taking the first relief valve 1562 as an example, the first relief valve 1562 is provided with an overflow inlet 1502 and a first overflow outlet 1506 which are interconnected, and an overflow pilot port 1504 is provided on the first relief valve 1562. The first relief valve 1562 and the second relief valve 1564 are respectively connected to the main hydraulic pipeline 120 through their respective overflow inlets 1502, so that the liquid can enter the first relief valve 1562 and the second relief valve 1564 respectively. The opening pressures of the first relief valve 1562 and the second relief valve 1564 are different. The pilot line 158 is connected to the main hydraulic pipeline 120 through the hydraulic control valve 154, and the pressure state of the main hydraulic pipeline 120 is high pressure, that is, the first pressure state. When the power consumption of the first pressure part 130 needs to be reduced and the heat dissipation requirement is small, the hydraulic control valve 154 is opened, the pilot line 158 is connected to the first liquid storage tank 172 through the hydraulic control valve 154, and the pressure state of the main hydraulic line 120 is low pressure, that is, the second pressure state. Specifically, the pilot line 158 is connected to the passage between the hydraulic control valve 154 and the first relief valve 1562, and the pilot line 158 is connected to the passage between the hydraulic control valve 154 and the second relief valve 1564, so that the hydraulic oil can enter the relief pilot ports of the first relief valve 1562 and the second relief valve 1564 through the liquid outlet 1544. By opening the hydraulic control valve 154, the pressure of the main hydraulic pipeline 120 can be controlled to be low pressure, part of the oil overflows to the second pressure part 140 through the first overflow valve 1562, and most of the oil overflows directly to the lubrication pipeline 148 through the second overflow valve 1564, while meeting the heat dissipation requirements, by reducing the flow resistance, the system pressure is further reduced, thereby reducing the power consumption of the hydraulic system. Specifically, the opening pressure of the first overflow valve 1562 is less than the opening pressure of the second overflow valve 1564. When the hydraulic control valve 154 is in a closed state, the second overflow valve 1564 is in a cut-off state, and the pressure state of the main hydraulic pipeline 120 is high pressure, that is, the first pressure state. The excess high-pressure liquid after consumption of the main hydraulic pipeline 120 enters the second pressure part 140 through the first overflow valve 1562.When the hydraulic control valve 154 is in the open state, the pilot line 158 is connected to the first liquid storage tank 172 through the hydraulic control valve 154, and there is no pressure feedback in the overflow pilot port 1504, that is, there is no pressure feedback in the overflow pilot port 1504 of the first overflow valve 1562 and the overflow pilot port 1504 of the second overflow valve 1564, so that the opening pressure of the first overflow valve 1562 and the second overflow valve 1564 is reduced. At this time, the first overflow valve 1562 and the second overflow valve 1564 are both in the conducting state, and the pressure state of the main hydraulic pipeline is the second pressure state, and the second pressure state is a low pressure state. Part of the liquid enters the heat dissipation pipeline 142 through the first overflow valve 1562, so that the liquid flowing through the heat dissipation pipeline 142 can be cooled by the radiator 144, thereby meeting the heat dissipation requirements of the automatic transmission, and most of the oil overflows directly to the lubrication pipeline 148 through the second overflow valve 1564.

[0059] like Figure 6 and Figure 7 As shown, the relief valve group 156 includes a third relief valve 1566, and the first relief outlet 1506 and the second relief outlet 1508 are respectively provided on the third relief valve 1566. At this time, the pilot line 158 is connected between the liquid outlet 1544 and the relief pilot port 1504 provided on the third relief valve 1566, which will not be described in detail. By using the integrated relief valve group 156 to control the pressure of the main hydraulic pipeline 120, the cost can be reduced while realizing two-stage relief pressure control.

[0060] Example 4

[0061] like Figure 3 As shown, this embodiment provides an automatic transmission hydraulic control system 100. In addition to the technical features of the above embodiments, this embodiment also includes the following technical features:

[0062] The first pressure part 130 includes: a gear clutch part 132, a parking clutch part 134 and a parking gear pipeline 136. The gear clutch part 132 includes a gear switch valve 1320 and a gear clutch 1310. The gear switch valve 1320 is provided with a gear fluid inlet 1322, a gear fluid outlet 1324 and a gear pilot port 1326. The gear fluid inlet 1322 is connected to the main hydraulic pipeline 120. At least a part of the gear clutch 1310 is connected to the gear fluid outlet 1324. The parking clutch part 134 includes a parking control valve 1340. The parking control valve 1340 is provided with a parking fluid outlet 1344. The parking gear pipeline 136 is connected between the parking fluid outlet 1344 and the gear pilot port 1326.

[0063] In this embodiment, the gear clutch unit 132 is provided with a gear clutch 1310 and a gear switch valve 1320, the gear fluid outlet 1324 of the gear switch valve 1320 is connected to the gear clutch 1310 through the gear clutch pipeline 1302, and the gear switch valve 1320 is connected to the main hydraulic pipeline 120 through the gear fluid inlet 1322. Figure 5 As shown, the gear clutch 1310 can also be divided into two parts, a first gear clutch 1312 and a second gear clutch 1314. The first gear clutch 1312 can be connected to the gear switch valve 1320 through the gear clutch pipeline 1302, and the second gear clutch 1314 is directly connected to the main hydraulic pipeline 120 through another pipeline, so that the gear clutch 1310 is partially interlocked with the parking clutch 1330, thereby realizing partial interlocking of the gear clutch 1310.

[0064] The parking clutch unit 134 is provided with a parking clutch 1330, a parking clutch pipeline 1304 and a parking control valve 1340, and the parking control valve 1340 is a solenoid valve. The parking control valve 1340 and the parking clutch 1330 are sequentially connected in series to the parking clutch pipeline 1304, and the hydraulic oil in the main hydraulic pipeline 120 can enter the parking control valve 1340. One end of the parking gear pipeline 136 is connected to the parking clutch pipeline 1304 after the parking fluid outlet 1344, and the other end of the parking gear pipeline 136 is connected to the gear pilot port 1326. When the parking gear of the parking clutch unit 134 is engaged, the pressure of the parking clutch 1330 is zero, so that the hydraulic oil cannot enter the gear switch valve 1320 through the parking gear pipeline 136. The gear switch valve 1320 is closed under the action of the return spring, and the pressure oil source of the gear clutch 1310 is cut off, and the gear cannot be engaged. When the parking gear is disengaged, the pressure of the parking clutch 1330 is high pressure. Under the pressure of the parking clutch 1330, the hydraulic oil enters the gear switch valve 1320 through the parking gear pipeline 136. The gear switch valve 1320 opens, and the communication between the gear clutch 1310 and the main hydraulic pipeline 120 is realized, and the driving gear can be engaged, which solves the problem that the gear clutch module and the parking clutch module are connected in parallel on the main oil circuit in the prior art, and when the solenoid valve, control circuit, program, etc. fail, it is easy to engage the parking gear and the driving gear at the same time, damage the transmission mechanism, and the reliability is low.

[0065] Since the gear clutch 1310 and the parking clutch 1330 are connected in parallel on the main hydraulic pipeline 120, when the solenoid valve, control circuit, program, etc. fail, it is easy to engage the parking gear and the driving gear at the same time, damaging the transmission mechanism and having low reliability. Therefore, this embodiment realizes the interlocking of the parking gear and the driving gear through the parking gear pipeline 136, which can avoid the parking gear being mistakenly engaged when the parking control valve 1340, control circuit, program, etc. fail, thereby improving the reliability of the automatic transmission hydraulic control system 100.

[0066] Example 5

[0067] like Figure 3 As shown, this embodiment provides an automatic transmission hydraulic control system 100. In addition to the technical features of the above embodiments, this embodiment also includes the following technical features:

[0068] The automatic transmission hydraulic control system 100 further includes an accumulator valve group 160, which is provided with an accumulator inlet and outlet 1602. The parking control valve 1340 is provided with a parking inlet 1342, which is connected to the main hydraulic pipeline 120, and the parking inlet 1342 is connected to the accumulator inlet and outlet 1602.

[0069] In this embodiment, the energy storage inlet and outlet 1602 of the energy storage valve group 160 is connected to the parking clutch pipeline 1304 between the first one-way valve 168 and the parking control valve 1340. When the parking control valve 1340 is closed, the parking clutch 1330 is depressurized, and the parking clutch 1330 is engaged under the action of the return spring to achieve parking, while the energy storage valve group 160 maintains pressure.

[0070] When the main oil circuit is used as the single pressure oil source of the parking clutch 1330, the main hydraulic pipeline 120 may have a pressure problem of "falling into a pit" due to factors such as shifting and occasional jamming of the parking control valve 1340, and the parking brake clutch 1330 may suddenly lock, damage the transmission mechanism, and even cause a safety accident when driving at high speed, which has low reliability. Therefore, in this embodiment, when the parking control valve 1340 is opened, the first one-way valve 168 is opened, and the main hydraulic pipeline 120 is connected to the parking clutch 1330, at this time, the accumulator valve group 160 and the main hydraulic pipeline 120 form a dual oil source, and the dual oil sources simultaneously supply oil to the parking clutch 1330, thereby improving the disengagement response speed of the parking clutch 1330 and enabling rapid exit from the parking gear.

[0071] Example 6

[0072] like Figure 3 As shown, this embodiment provides an automatic transmission hydraulic control system 100. In addition to the technical features of the above embodiments, this embodiment also includes the following technical features:

[0073] The accumulator valve group 160 includes: an accumulator 162, an accumulator control valve 164, a pressure sensor 166 and a first non-return valve 168. The accumulator control valve 164 is connected to the accumulator 162. The pressure sensor 166 is connected to the parking fluid outlet 1344, and the pressure sensor 166 is in communication connection with the accumulator control valve 164. Among them, the accumulator fluid inlet and outlet 1602 is provided on the accumulator 162, the first non-return valve 168 is provided between the parking control valve 1340 and the main hydraulic pipeline 120, and the first non-return valve 168 is provided between the accumulator control valve 164 and the main hydraulic pipeline 120.

[0074] In this embodiment, the first one-way valve 168, the parking control valve 1340 and the parking clutch 1330 are connected in series on the parking clutch pipeline 1304 in sequence, and the oil outlet of the first one-way valve 168 is connected to the oil inlet and outlet of the energy storage control valve 164. The energy storage control valve 164 is a solenoid valve. The pressure sensor 166 can be arranged on the parking clutch pipeline 1304 between the parking clutch 1330 and the parking control valve 1340, so that the pressure sensor 166 can detect the pressure of the hydraulic oil entering the parking clutch 1330. When the parking control valve 1340 is opened, the energy storage control valve 164 is opened, and the first one-way valve 168 is opened, the hydraulic oil can only enter the energy storage control valve 164, and cannot flow back into the main hydraulic pipeline 120. The main hydraulic pipeline 120 is connected to the parking clutch 1330, and the dual oil sources supply oil to the parking clutch 1330 at the same time, which improves the response speed of the parking clutch 1330 to disengage, and can quickly exit the parking gear. After the parking control valve 1340 is opened, when the sensor pressure value detected by the pressure sensor 166 is ≥ P1, the first one-way valve 168 is controlled to open, and the energy storage control valve 164 is controlled to close. The main hydraulic pipeline 120 replenishes oil to the oil circuit of the parking clutch 1330 to maintain pressure, and at the same time, the one-way oil replenishment position of the energy storage control valve 164 is used to store pressure in the accumulator 162. The pressure value of the parking clutch 1330 detected by the pressure sensor 166 is recorded as the sensor pressure value. When P1>sensor pressure value ≥ P2, the energy storage control valve 164 is closed. 64 is closed, the one-way oil replenishment position of the energy storage control valve 164 is closed, and the accumulator 162 maintains pressure, and the pressure is ≥ P1. When P2> the sensor pressure value, the energy storage control valve 164 opens, and the accumulator 162 replenishes oil to the parking clutch 1330, thereby increasing the pressure of the parking clutch 1330 and maintaining the disengagement stability of the parking clutch 1330. When the energy storage control valve 164 opens, the accumulator 162 replenishes oil to the parking clutch 1330, and the sensor pressure value ≤ P3 < P2, a parking clutch low pressure fault is reported. Among them, P1 is the first pressure preset value, P2 is the second pressure preset value, P3 is the third pressure preset value, and P1> P2> P3.

[0075] Example 7

[0076] like Figure 3 and Figure 4 As shown, this embodiment provides an automatic transmission hydraulic control system 100. In addition to the technical features of the above embodiments, this embodiment also includes the following technical features:

[0077] The first pressure unit 130 further includes a differential clutch unit 138. The differential clutch unit 138 includes a differential clutch 1382, a differential control valve 1384 and a pressure reducing valve 1386. The pressure reducing valve 1386 is connected to the main hydraulic pipeline 120 or the gear fluid outlet 1324 of the gear switch valve 1320 through a differential pipeline 1388.

[0078] In this embodiment, the differential control valve 1384 is a solenoid valve, and the pressure reducing valve 1386, the differential control valve 1384 and the differential clutch 1382 are sequentially connected in series on the differential pipeline 1388, and the pressure reducing valve 1386 is used to reduce the pressure of the hydraulic pressure entering the differential control valve 1384. The hydraulic pressure entering the pressure reducing valve 1386 comes from the main hydraulic pipeline 120, or the hydraulic pressure entering the pressure reducing valve 1386 comes from the gear clutch pipeline 1302 between the gear clutch 1310 and the gear switch valve 1320, so that the differential clutch 1382 and the gear clutch 1310 share the oil circuit, and the differential clutch 1382 and the parking clutch 1330 can be interlocked.

[0079] Example 8

[0080] like Figure 4 As shown, this embodiment provides an automatic transmission hydraulic control system 100. In addition to the technical features of the above embodiments, this embodiment also includes the following technical features:

[0081] The automatic transmission hydraulic control system 100 further includes a hydraulic source 170, which includes a first liquid storage tank 172, a second hydraulic pump 174, and a second liquid storage tank 176. The second hydraulic pump 174 is provided with a pump inlet 1742 and a pump outlet 1744, and the pump inlet 1742 is connected to the first liquid storage tank 172. The second liquid storage tank 176 is connected to the pump outlet 1744. The first hydraulic pump 110 is connected to the second hydraulic pump 174, so that the first hydraulic pump 110 and the second hydraulic pump 174 can be driven by the same power source, and the first hydraulic pump 110 is connected to the second liquid storage tank 176.

[0082] In this embodiment, the hydraulic source 170 is used to input liquid into the main hydraulic pipeline 120 through the first hydraulic pump 110. For example, the liquid can be hydraulic oil. The hydraulic source 170 is mainly composed of a first liquid storage tank 172, a second hydraulic pump 174, and a second liquid storage tank 176. The first liquid storage tank 172 is a gearbox oil tank, and the second liquid storage tank 176 is a main oil tank. A first liquid suction pipeline 1702 is connected between the first liquid storage tank 172 and the second hydraulic pump 174, one end of the first liquid suction pipeline 1702 is connected to the pump liquid inlet 1742, and the other end of the first liquid suction pipeline 1702 extends into the second liquid storage tank 176. A first suction filter 1700 is provided on the first liquid suction pipeline 1702. The function of the first suction filter 1700 is to filter the hydraulic oil so that the hydraulic oil entering the second liquid storage tank 176 can have a certain degree of cleanliness, which can improve the service life of the second hydraulic pump 174 and the reliability of the hydraulic system.

[0083] A pumping liquid pipeline 1704 is provided between the second hydraulic pump 174 and the second liquid storage tank 176, one end of the pumping liquid pipeline 1704 is connected to the pump outlet 1744, and the other end of the pumping liquid pipeline 1704 extends into the second liquid storage tank 176. A second suction liquid pipeline 1706 is provided between the first hydraulic pump 110 and the second liquid storage tank 176, and a second suction filter 1710 is provided on the second suction liquid pipeline 1706, so that the hydraulic oil entering the first hydraulic pump 110 can have a certain degree of cleanliness. The second hydraulic pump 174 is a large displacement pump, and the first hydraulic pump 110 is a small displacement pump. The second hydraulic pump 174 pumps the oil in the gearbox oil tank to the second liquid storage tank 176, which can ensure the oil volume of the second liquid storage tank 176. The lubrication pipeline 148 is connected to the first liquid storage tank 172, and the oil in the lubrication pipeline 148 flows back to the first liquid storage tank 172.

[0084] A filter press 180 is provided on the main hydraulic pipeline 120 to further ensure the cleanliness of the hydraulic pressure on the main hydraulic pipeline 120 .

[0085] Example 9

[0086] like Figure 4 As shown, this embodiment provides an automatic transmission hydraulic control system 100. In addition to the technical features of the above embodiments, this embodiment also includes the following technical features:

[0087] The hydraulic source 170 further includes an overflow line 178 , which is connected between the first liquid storage tank 172 and the second liquid storage tank 176 .

[0088] In this embodiment, excess oil overflows from the second liquid storage tank 176 back to the first liquid storage tank 172 through the overflow pipe 178, which can ensure the liquid level of the second liquid storage tank 176 and prevent the first liquid storage tank 172 from being sucked empty, thereby ensuring the reliability of the system.

[0089] Example 10

[0090] like Figure 8 As shown, this embodiment provides a working device 10, including: a device body 200; and an automatic transmission hydraulic control system 100 in any embodiment. At least a portion of the first pressure portion 130 is disposed on the device body 200, and at least a portion of the second pressure portion 140 is disposed on the device body 200.

[0091] In this embodiment, the working equipment 10 may be a grader. The working equipment 10 provided according to the embodiment of the present invention includes the automatic transmission hydraulic control system 100 according to any embodiment of the invention, so it has all the beneficial effects of the automatic transmission hydraulic control system 100 according to any embodiment of the invention.

[0092] Embodiment 11

[0093] like Figure 1 and Figure 8 As shown, this embodiment provides a working device 10 and an automatic transmission hydraulic control system 100, the automatic transmission hydraulic control system 100 includes: a first liquid storage tank 172, a first suction filter 1700, a second hydraulic pump 174, a second liquid storage tank 176, a first hydraulic pump 110, a filter press 180, a pressure reducing valve 1386, a differential control valve 1384, a differential clutch 1382, a gear switch valve 1320, a gear clutch 1310, a first check valve 168, a second check valve 146, a third check valve 1410, an accumulator 162, an energy storage control valve 164, The parking control valve 1340, the parking clutch 1330, the pressure sensor 166, the throttle element 152, the hydraulic control valve 154, the first overflow valve 1562, the radiator 144, the second overflow valve 1564, the first suction line 1702, the pump line 1704, the second suction line 1706, the overflow line 178, the second suction line 1706, the main hydraulic line 120, the differential line 1388, the gear clutch line 1302, the parking clutch line 1304, the parking gear line 136, the pilot line 158, the cooling line 142 and the lubrication line 148. The first reservoir 172 is a transmission oil tank.

[0094] In this embodiment, Figure 4 and Figure 5 As shown, the first hydraulic pump 110 connected to the second liquid storage tank 176 provides a pressure oil source for the pressure reducing valve 1386, the gear switch valve 1320, the first check valve 168, the first overflow valve 1562 or the second overflow valve 1564, and the throttling element 152 through the main hydraulic pipeline 120. The oil drain ports of the above valves are directly drained back to the first liquid storage tank 172, so that the pressure oil can be filtered by the first suction filter 1700 and then enter the second liquid storage tank 176, thereby achieving the purpose of saving oil.

[0095] Under driving conditions, the gearbox needs high pressure to transmit torque and generates a lot of heat. By closing the hydraulic control valve 154, the pressure of the main hydraulic pipeline 120 is controlled to be high pressure, so that all excess oil consumed by the main hydraulic pipeline 120 overflows to the heat dissipation pipeline 142 through a first overflow valve 1562, thereby meeting the power transmission, heat dissipation and lubrication requirements under this working condition.

[0096] Under driving conditions, the driving load of the grader is complex and changeable. By closing the hydraulic control valve 154 and controlling the pressure of the main hydraulic pipeline 120 to be high pressure and maintaining pressure stability, clutch slippage can be avoided and the service life of the clutch can be increased.

[0097] Under idling and parking conditions, the power consumption of the gearbox needs to be reduced and the heat dissipation demand is small. By opening the hydraulic control valve 154, the pressure of the main hydraulic pipeline 120 is controlled to be low pressure. Part of the oil overflows to the heat dissipation pipeline 142 through the first overflow valve 1562 with the first overflow outlet 1506, and most of the oil overflows directly to the lubrication pipeline 148 through the first overflow valve 1562 with the second overflow outlet 1508. While meeting the heat dissipation demand, the system pressure is further reduced by reducing the flow resistance, thereby reducing the power consumption of the hydraulic system.

[0098] During the operation of the grader, the working device is generally parked and idling, and the idling time accounts for a large proportion of the operating time. By opening the hydraulic control valve 154 and controlling the pressure of the main hydraulic pipeline 120 to a low pressure, the power consumption of the gearbox can be greatly reduced.

[0099] Under low-temperature starting conditions, after the vehicle is powered on, the hydraulic control valve 154 is opened first. When the engine is started, the pressure of the main hydraulic pipeline 120 is low, and the starting load of the oil pump is small, which can increase the life of the oil pump.

[0100] The parking clutch 1330 is connected to the first check valve 168, the parking control valve 1340, the energy storage control valve 164, the accumulator 162, and the pressure sensor 166 through the parking clutch pipeline 1304, and is connected to the main hydraulic pipeline 120 through the first check valve 168. When the parking gear is engaged, the parking control valve 1340 is closed, the parking clutch 1330 is depressurized, and the parking clutch 1330 is engaged under the action of the return spring to achieve parking. At the same time, the accumulator 162 controls the parking control valve 1340 to close, and the accumulator 162 maintains pressure. When the parking gear is withdrawn, the parking control valve 1340 is opened, the energy storage control valve 164 is opened, the first check valve 168 is opened, the main hydraulic pipeline 120 is connected to the parking clutch pipeline 1304, and the dual oil sources supply oil to the parking clutch 1330 at the same time, which improves the disengagement response speed of the parking clutch 1330 and can quickly withdraw from the parking gear.

[0101] When the driving gear is engaged, the parking control valve 1340 is opened. When the sensor pressure value detected by the pressure sensor 166 is ≥ P1, the first one-way valve 168 is opened, the energy storage control valve 164 is closed, and the main hydraulic pipeline 120 replenishes oil to the parking clutch pipeline 1304 to maintain the pressure. At the same time, the energy storage control valve 164 one-way oil replenishment level is used to store pressure in the accumulator 162. The pressure of the accumulator 162 is ≥ P1. When P1>the sensor pressure value ≥ P2, the energy storage control valve 164 is closed, the one-way oil replenishment level of the energy storage control valve 164 is closed, and the accumulator 162 maintains the pressure. The pressure is ≥ P1. When P2>the sensor pressure value, the energy storage control valve 164 is opened, and the accumulator 162 replenishes oil to the parking clutch 1330, thereby increasing the pressure of the parking clutch 1330 and maintaining the disengagement stability of the parking clutch 1330. When the sensor pressure value ≤ P3<P2, a low pressure fault of the parking clutch is reported.

[0102] When the parking gear is engaged, the pressure of the parking clutch 1330 is 0 Pascal, the gear switch valve 1320 is closed under the action of the return spring, the pressure oil source of the gear clutch 1310 is cut off, and the gear cannot be engaged, so the parking gear and the driving gear can be interlocked. The gear switch valve 1320 is a hydraulically controlled switch valve of the gear clutch module.

[0103] When the parking gear is shifted out, the pressure of the parking clutch 1330 is high pressure. Under the pressure of the parking clutch 1330, the gear switch valve 1320 opens, the gear clutch 1310 is connected with the main hydraulic pipeline 120, and the driving gear can be engaged.

[0104] Under driving conditions, when the parking gear is accidentally engaged, the parking control valve 1340 is closed, the pressure of the parking clutch 1330 is released to 0, the gear switch valve 1320 is closed, and the parking clutch 1330 is disengaged, which can avoid damage to the transmission system of the gearbox.

[0105] The second hydraulic pump 174 is a large-displacement pump as an oil pump, and the first hydraulic pump 110 is a small-displacement pump. The oil pump pumps the oil in the transmission oil tank to the main oil tank, and the excess oil overflows back to the transmission oil tank through the overflow pipe 178, thereby ensuring the liquid level of the main oil tank and preventing the transmission oil tank from being sucked empty.

[0106] The oil in the transmission oil tank enters the main oil tank after being filtered, which can ensure the cleanliness of the oil in the main oil tank and improve the life of the first hydraulic pump 110 and the reliability of the hydraulic system.

[0107] In this embodiment, by adopting a single pump to supply oil, the main hydraulic pipeline 120 adopts a two-stage overflow valve plus a pilot switch type solenoid valve to control the system pressure. In the driving condition, the high pressure overflows to meet the clutch pressure requirement. In the idling condition, the low pressure overflows in a branch way. One way overflows to the front of the radiator 144 to ensure the heat dissipation flow requirement, and the other way overflows to the back of the radiator 144, thereby reducing the pressure of the main hydraulic pipeline 120 and reducing the power consumption of the hydraulic system. By adopting the accumulator 162 as the second pressure source of the parking clutch 1330, the solenoid valve controls the oil supply of the accumulator 162 according to the pressure of the parking clutch 1330, thereby ensuring the pressure stability of the parking clutch 1330 and improving the reliability. By adopting the gear clutch module hydraulic control switch valve, the pressure of the parking clutch 1330 is controlled to realize the interlocking of the driving gear and the parking gear, which can avoid the parking gear from being mistakenly engaged when the solenoid valve, control circuit, program, etc. fail, thereby improving the reliability.

[0108] like Figure 4 As shown, by using the differential clutch 1382 and the gear clutch 1310 to share the same oil circuit, the differential clutch 1382 and the parking clutch 1330 can be interlocked.

[0109] like Figure 5 As shown, by dividing the gear clutch 1310 into two modules, the first gear clutch 1312 is interlocked with the parking clutch 1330, and the second gear clutch 1314 is not interlocked with the parking clutch 1330, thereby achieving partial interlocking of the gear clutch 1310.

[0110] like Figure 6 As shown, the integrated second overflow valve 1564 is used to control the pressure of the main hydraulic pipeline 120, which can reduce the cost while achieving two-stage overflow pressure control.

[0111] In summary, the beneficial effects of the embodiments of the invention are as follows:

[0112] 1. A single-pump oil supply method of the first hydraulic pump 110 is adopted, and an overflow device 150 is used between the main hydraulic pipeline 120 and the second pressure part 140 to control the pressure of the main hydraulic pipeline 120, which can meet the different pressure requirements of the first pressure part 130 and the second pressure part 140 for the liquid, reduce the pressure of the main hydraulic pipeline 120, and reduce the power consumption of the automatic transmission hydraulic control system 100.

[0113] 2. The accumulator 162 is used as the second pressure source. According to the pressure of the parking clutch 1330, the accumulator control valve 164 controls the oil supply of the accumulator 162, thereby ensuring the pressure stability of the parking clutch 1330 and improving the reliability of the automatic transmission hydraulic control system 100.

[0114] 3. The gear switch valve 1320 is used to control the pressure of the parking clutch 1330 to achieve interlocking between the driving gear and the parking gear, which can avoid the accidental engagement of the parking gear and improve the reliability of the automatic transmission hydraulic control system 100.

[0115] In the embodiments according to the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments according to the present invention can be understood according to specific circumstances.

[0116] In the description of the embodiments of the present invention, it should be understood that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the embodiments of the present invention.

[0117] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments according to the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0118] The above are only preferred embodiments according to the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various modifications and changes may be made according to the embodiments of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention shall be included in the protection scope of the embodiments of the present invention.

Claims

1. An automatic transmission hydraulic control system, characterized in that: include: The first hydraulic pump; a main hydraulic pipeline connected to the first hydraulic pump; a first pressure part connected to the main hydraulic pipeline; Overflow device; a second pressure part, the second pressure part being connected to the main hydraulic pipeline through the overflow device so that the main hydraulic pipeline is switched between a first pressure state and a second pressure state; The overflow device comprises: A throttling element, wherein the throttling element is provided with a throttling inlet and a throttling outlet, and the throttling inlet is connected to the main hydraulic pipeline; A hydraulically controlled valve, wherein the hydraulically controlled valve is provided with a liquid inlet and a liquid outlet, wherein the liquid inlet is connected to the throttling outlet; A relief valve group, wherein the relief valve group is provided with an overflow inlet, an overflow pilot port, a first overflow outlet and a second overflow outlet, and the overflow inlet is connected to the main hydraulic pipeline; a pilot line connected between the liquid outlet and the overflow pilot port; Wherein, the second pressure part comprises a radiator, the radiator is connected to a lubrication pipeline, and the radiator is connected to the first overflow outlet through the heat dissipation pipeline, and the second overflow outlet is connected to the lubrication pipeline; The overflow valve group includes: a first overflow valve and a second overflow valve, each of the first overflow valve and the second overflow valve is provided with an overflow inlet and an overflow pilot port, and the first overflow outlet is provided on the first overflow valve, the second overflow outlet is provided on the second overflow valve, and the pilot line is connected between the liquid outlet and the two overflow pilot ports; or the overflow valve group includes a third overflow valve, the third overflow valve is provided with an overflow inlet and an overflow pilot port, and the first overflow outlet and the second overflow outlet are respectively provided on the third overflow valve.

2. The automatic transmission hydraulic control system according to claim 1, characterized in that: The first pressure part comprises: A gear clutch unit, the gear clutch unit comprising a gear switch valve and a gear clutch, the gear switch valve being provided with a gear fluid inlet, a gear fluid outlet and a gear pilot port, the gear fluid inlet being connected to the main hydraulic pipeline, and at least a portion of the gear clutch being connected to the gear fluid outlet; A parking clutch unit, the parking clutch unit comprising a parking control valve, the parking control valve being provided with a parking fluid outlet; A parking gear pipeline is connected between the parking fluid outlet and the gear pilot port.

3. The automatic transmission hydraulic control system according to claim 2, characterized in that: Also includes: Energy storage valve group, the energy storage valve group is provided with energy storage liquid inlet and outlet; Wherein, the parking control valve is provided with a parking fluid inlet, the parking fluid inlet is connected to the main hydraulic pipeline, and the parking fluid inlet is connected to the energy storage fluid inlet and outlet.

4. The automatic transmission hydraulic control system according to claim 3, characterized in that: The energy storage valve group comprises: Accumulator; An energy storage control valve, the energy storage control valve is connected to the accumulator; A pressure sensor, the pressure sensor is connected to the parking fluid outlet, and the pressure sensor is communicatively connected to the energy storage control valve; Among them, the energy storage inlet and outlet are arranged on the accumulator, a first one-way valve is arranged between the parking control valve and the main hydraulic pipeline, and the first one-way valve is arranged between the energy storage control valve and the main hydraulic pipeline.

5. The automatic transmission hydraulic control system according to claim 2, characterized in that: The first pressure part further comprises: The differential clutch unit includes a differential clutch, a differential control valve and a pressure reducing valve, and the pressure reducing valve is connected to the main hydraulic pipeline or the gear switch valve through a differential pipeline.

6. The automatic transmission hydraulic control system according to claim 1, characterized in that: Also includes: A hydraulic source, the hydraulic source comprising: a first liquid storage tank; a second hydraulic pump, the second hydraulic pump being provided with a pump inlet and a pump outlet, the pump inlet being connected to the first liquid storage tank; a second liquid storage tank, the second liquid storage tank being connected to the liquid outlet of the pump; Wherein, the first hydraulic pump is connected to the second hydraulic pump, and the first hydraulic pump is connected to the second fluid storage tank.

7. The automatic transmission hydraulic control system according to claim 6, characterized in that: Hydraulic sources also include: An overflow pipeline is connected between the first liquid storage tank and the second liquid storage tank.

8. An operating device, characterized in that: include: Equipment body; The automatic transmission hydraulic control system according to any one of claims 1 to 7; Wherein, at least a part of the first pressure part is disposed on the device body, and at least a part of the second pressure part is disposed on the device body.

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