Transmission hydraulic system and vehicle

Abstract

The utility model relates to a kind of transmission hydraulic system and vehicle, transmission hydraulic system includes: oil supply device;Speed changer;High-pressure module includes first mechanical pump, control valve and high-pressure oil circuit, high-pressure oil circuit connects oil supply device and speed changer, first mechanical pump and control valve are all located in high-pressure oil circuit, first mechanical pump is used to be connected with the output shaft transmission of differential, control valve is used to control the on-off between high-pressure oil circuit and speed changer;Cooling module includes second mechanical pump, oil cooler and cooling oil circuit, one end of cooling oil circuit is communicated with oil supply device, second mechanical pump and oil cooler are all located in cooling oil circuit, second mechanical pump is used to be connected with the output shaft transmission of first motor.Such can simplify electric control system, reduce structural complexity and control difficulty, save space, reduce weight, reduce cost;First mechanical pump is driven by differential, second mechanical pump is driven by first motor, so that the flow distribution of high-pressure oil circuit and cooling oil circuit is more reasonable.

Description

Technical Field

[0001] This utility model relates to the field of transmission technology, and in particular to a transmission hydraulic system and vehicle. Background Technology

[0002] Hybrid transmissions require a hydraulic system for gear shifting and the supply of cooling and lubricating oil. Existing transmission hydraulic systems typically include a high-pressure oil circuit for controlling the shift actuators and a low-pressure oil circuit for providing cooling and lubrication. The high-pressure oil circuit is generally supplied by a mechanical pump connected to the engine input shaft or a separate electric pump, while the low-pressure oil circuit is typically supplied by a separate electric pump.

[0003] However, electric pumps rely on complex electronic control systems, which not only increases the complexity and control difficulty of the overall structure of the hybrid transmission, but also occupies more layout space. Utility Model Content

[0004] Therefore, it is necessary to provide a transmission hydraulic system and vehicle to address the above problems, so as to reduce the space occupied while ensuring the normal operation of the transmission hydraulic system.

[0005] This utility model first provides a transmission hydraulic system, including: an oil supply device; a transmission device; a high-pressure module, including a first mechanical pump, a control valve, and a high-pressure oil circuit, wherein the high-pressure oil circuit connects the oil supply device and the transmission device, the first mechanical pump and the control valve are both located in the high-pressure oil circuit, the first mechanical pump is used for drive connection with the output shaft of the differential, and the control valve is used for controlling the on / off connection between the high-pressure oil circuit and the transmission device; and a cooling module, including a second mechanical pump, an oil cooler, and a cooling oil circuit, one end of the cooling oil circuit being connected to the oil supply device, the second mechanical pump and the oil cooler being both located in the cooling oil circuit, and the second mechanical pump being used for drive connection with the output shaft of a first motor.

[0006] In the aforementioned transmission hydraulic system, the use of a first mechanical pump and a second mechanical pump simplifies the electronic control system, reduces structural complexity and control difficulty, thereby lowering the system failure rate. It also saves space, reduces weight, and lowers costs. Furthermore, since the differential output shaft speed is related to the engine or wheel speed, the first mechanical pump, driven by the differential, can stably provide high-pressure oil to the high-pressure oil circuit, ensuring the transmission's response speed. The second mechanical pump, driven by the first motor, can flexibly adjust the flow rate of the cooling oil circuit, making the flow distribution between the high-pressure and cooling oil circuits more rational. In addition, the second mechanical pump typically has lower power, allowing for a compact arrangement with the first motor, further reducing space occupation.

[0007] In one embodiment, the transmission device includes a hydraulic chamber and a shift piston slidably disposed in the hydraulic chamber. The hydraulic chamber has a first oil port and a second oil port at both ends along the sliding direction of the shift piston. The control valve is used to control the connection and disconnection between the high-pressure oil circuit and the first oil port and the second oil port.

[0008] This configuration allows the shift piston to be precisely engaged in the target gear by controlling the valve to precisely adjust the sliding direction of the shift piston.

[0009] In one embodiment, the control valve has a first input port, a first output port, a first connecting port, and a second connecting port. The high-pressure oil circuit includes a first oil circuit, a second oil circuit, and a third oil circuit. The first oil circuit connects the oil supply device and the first input port. The second oil circuit connects the first connecting port and the first oil port. The third oil circuit connects the second connecting port and the second oil port. The first output port is connected to the oil supply device. The first mechanical pump is located in the first oil circuit. The control valve has a first position, a second position, and a third position. In the first position, both the first input port and the first output port are disconnected from the first connecting port and the second connecting port. In the second position, the first input port is connected to the first connecting port, and the second connecting port is connected to the first output port. In the third position, the first input port is connected to the second connecting port, and the first connecting port is connected to the first output port.

[0010] With this setup, the control valve has a simple structure, and only three positions need to be switched to accurately control the shift piston for gear shifting.

[0011] In one embodiment, the control valve is a flow solenoid valve.

[0012] This setup requires lower current accuracy, which reduces control difficulty, lowers system failure rate, and enhances resistance to contamination.

[0013] In one embodiment, the high-pressure oil circuit includes a first section, a second section, a third section, and a fourth section. The first mechanical pump has a first pump port and a second pump port. The high-pressure module further includes a first check valve and a second check valve. The first section connects the oil supply device and the first pump port. The second section connects the second pump port and the control valve. The first check valve is located in the first section to allow oil in the first section to flow from the oil supply device to the first pump port. The third section connects the oil supply device and the second pump port. The fourth section connects the first pump port and the control valve. The second check valve is located in the third section to allow oil in the third section to flow from the oil supply device to the second pump port.

[0014] With this setup, the first mechanical pump can operate normally regardless of whether the differential is rotating in the forward or reverse direction.

[0015] In one embodiment, the cooling oil circuit includes a fifth section, a sixth section, a seventh section, and an eighth section; the second mechanical pump has a third pump port and a fourth pump port; the cooling module further includes a third check valve and a fourth check valve; the fifth section connects the oil supply device and the third pump port; the sixth section communicates with the fourth pump port; the third check valve is located in the fifth section to allow oil in the fifth section to flow from the oil supply device to the third pump port; the seventh section connects the oil supply device and the fourth pump port; the eighth section communicates with the third pump port; the fourth check valve is located in the seventh section to allow oil in the seventh section to flow from the oil supply device to the fourth pump port.

[0016] With this setup, the second mechanical pump can operate normally regardless of whether the first motor rotates forward or backward.

[0017] In one embodiment, the cooling module further includes a switching valve, wherein the end of the cooling oil circuit away from the oil supply device is used to communicate with the first motor, and the switching valve is used to control the connection and disconnection between the cooling oil circuit and the first motor.

[0018] This configuration allows for on-demand cooling and lubrication of the first motor via a switching valve.

[0019] In one embodiment, the transmission hydraulic system further includes a pressure regulating module, which includes a spool valve and a pressure regulating oil circuit. The pressure regulating oil circuit is connected to the high-pressure oil circuit and the cooling oil circuit, and the spool valve is used to control the on / off state of the pressure regulating oil circuit.

[0020] This configuration allows for the regulation of oil pressure in both the high-pressure oil circuit and the cooling oil circuit via a pressure regulating module.

[0021] In one embodiment, the high-pressure module further includes a first safety oil circuit and a first safety valve disposed in the first safety oil circuit, the first safety oil circuit being connected to the high-pressure oil circuit and the oil supply device.

[0022] With this configuration, excess high-pressure oil in the first oil circuit can flow back to the oil supply device through the first safety oil circuit, thus ensuring the safety of the high-pressure module.

[0023] This utility model also provides a vehicle including the transmission hydraulic system described above. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a transmission hydraulic system according to one embodiment of the present invention;

[0026] Figure 2 Provided by this utility model Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 Provided by this utility model Figure 1 Enlarged view of point B in the middle;

[0028] Figure 4 Provided by this utility model Figure 1 Enlarged view of point C in the middle.

[0029] Reference numerals: 1. Oil supply device; 2. Transmission device; 21. Hydraulic chamber; 211. First oil port; 212. Second oil port; 22. Shift piston; 3. High-pressure module; 31. First mechanical pump; 311. First pump port; 312. Second pump port; 32. Control valve; 321. First input port; 322. First output port; 323. First connecting port; 324. Second connecting port; 325. First position; 326. Second position; 327. Third position; 33. High-pressure oil circuit; 331. First oil circuit; 3311. First stage; 3312. Second stage; 3313. Third stage; 3314. Fourth stage; 332. Second oil circuit; 333. Third oil circuit; 34. First check valve; 35. Second check valve; 36. First safety oil circuit; 37. First safety valve; 38. Filter 4. Cooling module; 41. Second mechanical pump; 411. Third pump port; 412. Fourth pump port; 42. Oil cooler; 43. Cooling oil circuit; 431. Fifth section; 432. Sixth section; 433. Seventh section; 434. Eighth section; 44. Third check valve; 45. Fourth check valve; 46. Switch valve; 461. Second input port; 462. Second output port; 463. Fourth position; 464. Fifth position; 47. First feedback oil circuit; 48. Second safety oil circuit; 49. Second safety valve; 5. Pressure regulating module; 51. Slide valve; 511. Third input port; 512. Third output port; 513. Sixth position; 514. Seventh position; 515. Eighth position; 52. Pressure regulating oil circuit; 53. Second feedback oil circuit; 6. Shaft gear device; P1. First motor; P3. Third motor. Detailed Implementation

[0030] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0031] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0035] Hybrid transmissions require a hydraulic system for gear shifting and the supply of cooling and lubricating oil. Existing transmission hydraulic systems typically include a high-pressure oil circuit for controlling the shift actuators and a low-pressure oil circuit for providing cooling and lubrication. The high-pressure oil circuit is generally supplied by a mechanical pump connected to the engine input shaft or a separate electric pump, while the low-pressure oil circuit is typically supplied by a separate electric pump. However, electric pumps rely on complex electronic control systems, which not only increases the overall complexity and control difficulty of the hybrid transmission but also occupies more space.

[0036] To solve the above problems, such as Figures 1 to 4 As shown, this utility model provides a transmission hydraulic system that reduces the space occupied while ensuring the normal operation of the transmission hydraulic system.

[0037] like Figure 1 As shown, specifically, the transmission hydraulic system includes an oil supply device 1, a transmission device 2, a high-pressure module 3, and a cooling module 4. The high-pressure module 3 includes a first mechanical pump 31, a control valve 32, and a high-pressure oil circuit 33. The high-pressure oil circuit 33 connects the oil supply device 1 and the transmission device 2. The first mechanical pump 31 and the control valve 32 are both located in the high-pressure oil circuit 33. The first mechanical pump 31 is used for drive connection with the output shaft of the differential (not shown), and the control valve 32 is used to control the on / off connection between the high-pressure oil circuit 33 and the transmission device 2. The cooling module 4 includes a second mechanical pump 41, an oil cooler 42, and a cooling oil circuit 43. One end of the cooling oil circuit 43 is connected to the oil supply device 1. The second mechanical pump 41 and the oil cooler 42 are both located in the cooling oil circuit 43. The second mechanical pump 41 is used for drive connection with the output shaft of the first motor P1. The end of the cooling oil circuit 43 away from the oil supply device 1 can be connected to other locations such as the first motor P1, the third motor P3, and the gear assembly 6.

[0038] In the transmission hydraulic system provided in this embodiment of the utility model, when the differential is working, it drives the first mechanical pump 31 to operate synchronously, pumping the oil in the oil supply device 1 into the high-pressure oil circuit 33. The control valve 32 adjusts the connection and disconnection between the high-pressure oil circuit 33 and the transmission device 2 according to the gear shifting requirements, and uses the high-pressure oil to realize gear shifting. At the same time, when the first motor P1 is working, it drives the second mechanical pump 41 to operate synchronously, pumping the oil in the oil supply device 1 into the cooling oil circuit 43. After being cooled by the oil cooler 42, the oil flows to the first motor P1, the third motor P3 and the shaft gear device 6 and other components to achieve cooling and lubrication. Thus, employing the first mechanical pump 31 and the second mechanical pump 41 simplifies the electronic control system, reduces structural complexity and control difficulty, thereby lowering the system failure rate. It also saves space, reduces weight, and lowers costs. Furthermore, since the differential output shaft speed is related to the engine or wheel speed, the first mechanical pump 31, driven by the differential, can stably provide high-pressure oil to the high-pressure oil circuit 33, ensuring the response speed of the transmission device 2. The second mechanical pump 41, driven by the first motor P1, can flexibly adjust the flow rate of the cooling oil circuit 43, making the flow distribution between the high-pressure oil circuit 33 and the cooling oil circuit 43 more reasonable. In addition, the power of the second mechanical pump 41 is usually smaller, allowing it to be compactly arranged with the first motor P1, further reducing space occupation.

[0039] like Figure 2 As shown, the transmission device 2 includes a hydraulic chamber 21 and a shift piston 22 slidably disposed in the hydraulic chamber 21. The hydraulic chamber 21 has a first oil port 211 and a second oil port 212 at both ends along the sliding direction of the shift piston 22. A control valve 32 controls the connection and disconnection between the high-pressure oil circuit 33 and the first oil port 211 and the second oil port 212. When the high-pressure oil circuit 33 is connected to the first oil port 211, the high-pressure oil pushes the shift piston 22 towards the end closer to the second oil port 212; conversely, when the high-pressure oil circuit 33 is connected to the second oil port 212, the high-pressure oil pushes the shift piston 22 towards the end closer to the first oil port 211. By precisely adjusting the sliding direction of the shift piston 22 through the control valve 32, the shift piston 22 can accurately engage the target gear, thus realizing the shift control of the transmission device 2.

[0040] like Figures 1 to 2As shown, the control valve 32 is a three-position four-way valve. Specifically, the control valve 32 is provided with a first input port 321, a first output port 322, a first connecting port 323, and a second connecting port 324. The high-pressure oil circuit 33 includes a first oil circuit 331, a second oil circuit 332, and a third oil circuit 333. The first oil circuit 331 is connected to the oil supply device 1 and the first input port 321. The second oil circuit 332 is connected to the first connecting port 323 and the first oil port 211. The third oil circuit 333 is connected to the second connecting port 324 and the second oil port 212. The first output port 322 is connected to the oil supply device 1. The first mechanical pump 31 is located in the first oil circuit 331. The control valve 32 has a first position 325, a second position 326, and a third position 327.

[0041] In the first position 325, both the first input port 321 and the first output port 322 are disconnected from the first connecting port 323 and the second connecting port 324. At this time, the shift piston 22 will not slide relative to the hydraulic chamber 21. In the second position 326, the first input port 321 is connected to the first connecting port 323, and the second connecting port 324 is connected to the first output port 322. At this time, when the high-pressure oil in the first oil passage 331 enters the hydraulic chamber 21 in sequence through the first input port 321, the first connecting port 323, the second oil passage 332, and the first oil port 211, the oil at the other end of the hydraulic chamber 21 flows back to the oil supply device 1 in sequence through the second oil port 212, the third oil passage 333, the second connecting port 324, and the first output port 322. The high-pressure oil pushes the shift piston 22 to slide towards the end closer to the second oil port 212. In the third position 327, the first input port 321 is connected to the second connecting port 324, and the first connecting port 323 is connected to the first output port 322. At this time, when the high-pressure oil in the first oil passage 331 enters the hydraulic chamber 21 through the first input port 321, the second connecting port 324, the third oil passage 333, and the second oil port 212 in sequence, the oil at the other end of the hydraulic chamber 21 flows back to the oil supply device 1 through the first oil port 211, the second oil passage 332, the first connecting port 323, and the first output port 322 in sequence. The high-pressure oil pushes the shift piston 22 to slide towards the end closer to the first oil port 211. In this way, the structure of the control valve 32 is simple, and only three positions need to be switched to accurately control the shift piston 22 to shift gears.

[0042] like Figure 2 As shown, in one embodiment, the control valve 32 is a flow solenoid valve. The valve position can be controlled by adjusting the current of the flow solenoid valve, and the current accuracy requirement is relatively low, thereby further reducing control difficulty, lowering the system failure rate, and enhancing anti-pollution capability. Of course, in other embodiments, the control valve 32 can also be a mechanically driven valve, a proportional solenoid valve, a pilot valve, an electro-hydraulic servo valve, or other valve bodies capable of controlling the on / off connection between the high-pressure oil circuit 33 and the speed transmission device 2. This embodiment of the present invention does not impose specific limitations.

[0043] like Figure 2 As shown, the high-pressure module 3 also includes a first safety oil circuit 36 ​​and a first safety valve 37 disposed in the first safety oil circuit 36. The first safety oil circuit 36 ​​is connected to the first oil circuit 331 of the high-pressure oil circuit 33 and the oil supply device 1. The first safety valve 37 can be a one-way valve, allowing the oil in the first safety oil circuit 36 ​​to flow from the first oil circuit 331 to the oil supply device 1. When the control valve 32 is in the first position 325, or when the flow rate in the first oil circuit 331 is too high, the excess high-pressure oil in the first oil circuit 331 can flow back to the oil supply device 1 through the first safety oil circuit 36, thus ensuring the safety of the high-pressure module 3.

[0044] like Figure 1 and Figure 3 As shown, the first oil circuit 331 of the high-pressure oil circuit 33 includes a first section 3311, a second section 3312, a third section 3313, and a fourth section 3314. The first mechanical pump 31 has a first pump port 311 and a second pump port 312. The high-pressure module 3 also includes a first check valve 34 and a second check valve 35. The first section 3311 connects the oil supply device 1 and the first pump port 311. The second section 3312 connects the second pump port 312 and the control valve 32. The first check valve 34 is located in the first section 3311 so that the oil in the first section 3311 flows from the oil supply device 1 to the first pump port 311. The third section 3313 connects the oil supply device 1 and the second pump port 312. The fourth section 3314 connects the first pump port 311 and the control valve 32. The second check valve 35 is located in the third section 3313 so that the oil in the third section 3313 flows from the oil supply device 1 to the second pump port 312. When the differential rotates forward, the oil in the oil supply device 1 flows sequentially through the first section 3311, the first pump port 311, the second pump port 312, and the second section 3312 to the control valve 32. When the differential rotates in reverse, the oil in the oil supply device 1 flows sequentially through the third section 3313, the second pump port 312, the first pump port 311, and the fourth section 3314 to the control valve 32. Alternatively, when the differential rotates forward, the oil in the oil supply device 1 flows sequentially through the third section 3313, the second pump port 312, the first pump port 311, and the fourth section 3314 to the control valve 32; when the differential rotates in reverse, the oil in the oil supply device 1 flows sequentially through the first section 3311, the first pump port 311, the second pump port 312, and the second section 3312 to the control valve 32. In this way, the normal operation of the first mechanical pump 31 can be guaranteed regardless of whether the differential rotates forward or in reverse.

[0045] Furthermore, one-way valves can also be installed on the second section 3312 and the fourth section 3314 to ensure the flow direction of the high-pressure oil in the first oil circuit 331.

[0046] like Figure 3As shown, the high-pressure module 3 also includes a filter 38 located in the first oil circuit 331 of the high-pressure oil circuit 33 to filter contaminants in the high-pressure oil, protect the transmission device 2 and maintain stable system operation.

[0047] like Figure 1 and Figure 3 As shown, the cooling oil circuit 43 includes a fifth section 431, a sixth section 432, a seventh section 433, and an eighth section 434. The second mechanical pump 41 has a third pump port 411 and a fourth pump port 412. The cooling module 4 also includes a third check valve 44 and a fourth check valve 45. The fifth section 431 is connected to the oil supply device 1 and the third pump port 411. The sixth section 432 is connected to the fourth pump port 412. The third check valve 44 is located in the fifth section 431 so that the oil in the fifth section 431 flows from the oil supply device 1 to the third pump port 411. The seventh section 433 is connected to the oil supply device 1 and the fourth pump port 412. The eighth section 434 is connected to the third pump port 411. The fourth check valve 45 is located in the seventh section 433 so that the oil in the seventh section 433 flows from the oil supply device 1 to the fourth pump port 412. When the first motor P1 rotates forward, the oil in the oil supply device 1 flows sequentially through the fifth section 431, the third pump port 411, the fourth pump port 412, and the sixth section 432 to the oil cooler 42; when the first motor P1 rotates in reverse, the oil in the oil supply device 1 flows sequentially through the seventh section 433, the fourth pump port 412, the third pump port 411, and the eighth section 434 to the oil cooler 42. Alternatively, when the first motor P1 rotates forward, the oil in the oil supply device 1 flows sequentially through the seventh section 433, the fourth pump port 412, the third pump port 411, and the eighth section 434 to the oil cooler 42; when the first motor P1 rotates in reverse, the oil in the oil supply device 1 flows sequentially through the fifth section 431, the third pump port 411, the fourth pump port 412, and the sixth section 432 to the oil cooler 42. In this way, the normal operation of the second mechanical pump 41 can be guaranteed regardless of whether the first motor P1 rotates forward or reverse.

[0048] Furthermore, one-way valves may also be provided on the sixth section 432 and the eighth section 434 to ensure the flow direction of the oil in the cooling oil circuit 43.

[0049] like Figure 1 and Figure 4As shown, in one embodiment, the cooling module 4 further includes a switching valve 46. The end of the cooling oil passage 43 away from the oil supply device 1 is used to connect with the first motor P1, and the switching valve 46 is used to control the connection and disconnection between the cooling oil passage 43 and the first motor P1. Thus, the switching valve 46 can achieve on-demand cooling and lubrication of the first motor P1. Specifically, the switching valve 46 has a second input port 461 and a second output port 462. The second input port 461 is connected to the end of the cooling oil passage 43 away from the oil supply device 1, and the second output port 462 is used to connect with the first motor P1. The switching valve 46 has a fourth position 463 and a fifth position 464. In the fourth position 463, the second input port 461 and the second output port 462 are disconnected, and at this time, the oil in the cooling oil passage 43 cannot flow to the first motor P1. At position 464, the second input port 461 and the second output port 462 are connected. At this time, the oil in the cooling oil circuit 43 flows to the first motor P1 through the second input port 461 and the second output port 462 in sequence, so as to achieve cooling and lubrication of the first motor P1.

[0050] Furthermore, the cooling module 4 also includes a first feedback oil circuit 47, with its two ends connected to a cooling oil circuit 43 and a switching valve 46, respectively. When the speed of the first motor P1 is low, the oil pressure in the cooling oil circuit 43 and the first feedback oil circuit 47 is lower than a preset value, and the switching valve 46 remains in the fourth position 463, cutting off the oil supply to the first motor P1; when the speed of the first motor P1 increases, causing the oil pressure in the cooling oil circuit 43 and the first feedback oil circuit 47 to exceed the preset value, the switching valve 46 switches to the fifth position 464, and the oil in the cooling oil circuit 43 begins to flow to the first motor P1.

[0051] like Figure 1 and Figure 3 As shown, the cooling module 4 also includes a second safety oil passage 48 and a second safety valve 49 disposed in the second safety oil passage 48. The second safety oil passage 48 is connected to the first feedback oil passage 47 and the oil supply device 1. The second safety valve 49 can be a one-way valve, allowing the oil in the second safety oil passage 48 to flow from the first feedback oil passage 47 to the oil supply device 1. When the flow rate in the first feedback oil passage 47 is too high, the excess oil in the first feedback oil passage 47 can flow back to the oil supply device 1 through the second safety oil passage 48, thus ensuring the safety of the cooling module 4.

[0052] Of course, in other embodiments, a switching valve 46 may also be provided as needed between the end of the cooling oil circuit 43 away from the oil supply device 1 and the third motor P3 and the shaft gear device 6.

[0053] like Figure 1 and Figure 4As shown, the transmission hydraulic system also includes a pressure regulating module 5. The pressure regulating module 5 includes a spool valve 51 and a pressure regulating oil circuit 52. The pressure regulating oil circuit 52 connects to the high-pressure oil circuit 33 and the cooling oil circuit 43. The spool valve 51 controls the opening and closing of the pressure regulating oil circuit 52. Thus, the pressure of the high-pressure oil circuit 33 and the cooling oil circuit 43 can be regulated through the pressure regulating module 5. Specifically, the spool valve 51 has a third input port 511 and a third output port 512. The third input port 511 is connected to the high-pressure oil circuit 33, and the third output port 512 is connected to the cooling oil circuit 43. The spool valve 51 has a sixth position 513, a seventh position 514, and an eighth position 515. In the sixth position 513, the third input port 511 and the third output port 512 are connected. At this time, the pressure regulating oil circuit 52 is in a connected state, and part of the high-pressure oil in the high-pressure oil circuit 33 flows to the cooling oil circuit 43 through the pressure regulating oil circuit 52. In position 514 (seventh position), the third input port 511 is disconnected from the third output port 512, and the third input port 511 is connected to the transmission housing (not shown). At this time, a portion of the high-pressure oil in the high-pressure oil circuit 33 flows to the transmission housing for lubrication through the pressure regulating oil circuit 52. In position 515 (eighth position), the third input port 511 is disconnected from the third output port 512, and the third input port 511 is connected to the oil supply device 1. At this time, a portion of the high-pressure oil in the high-pressure oil circuit 33 flows back to the oil supply device 1 through the pressure regulating oil circuit 52.

[0054] Furthermore, the pressure regulating module 5 also includes a second feedback oil circuit 53, with its two ends connected to the high-pressure oil circuit 33 and the slide valve 51, respectively. When the differential speed is low, the oil pressure of the high-pressure oil circuit 33 and the second feedback oil circuit 53 is lower than a preset value, and the slide valve 51 remains in the sixth position 513. When the differential speed gradually increases, causing the oil pressure of the high-pressure oil circuit 33 and the second feedback oil circuit 53 to exceed the first preset value, the slide valve 51 switches to the seventh position 514. When the differential speed continues to increase, causing the oil pressure of the high-pressure oil circuit 33 and the second feedback oil circuit 53 to exceed the second preset value, the slide valve 51 switches to the eighth position 515, thereby achieving automatic graded adjustment of the oil pressure of the high-pressure oil circuit 33.

[0055] This invention also provides a vehicle including the aforementioned transmission hydraulic system. This improves control over the transmission fluid, reduces space requirements, and lowers production costs.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A transmission hydraulic system, characterized in that, include: Oil supply device (1); Speed ​​change device (2); The high-pressure module (3) includes a first mechanical pump (31), a control valve (32), and a high-pressure oil circuit (33). The high-pressure oil circuit (33) connects the oil supply device (1) and the transmission device (2). The first mechanical pump (31) and the control valve (32) are both located in the high-pressure oil circuit (33). The first mechanical pump (31) is used for drive connection with the output shaft of the differential. The control valve (32) is used to control the on / off connection between the high-pressure oil circuit (33) and the transmission device (2). The cooling module (4) includes a second mechanical pump (41), an oil cooler (42) and a cooling oil circuit (43). One end of the cooling oil circuit (43) is connected to the oil supply device (1). The second mechanical pump (41) and the oil cooler (42) are both located in the cooling oil circuit (43). The second mechanical pump (41) is used to drive the output shaft of the first motor (P1).

2. The transmission hydraulic system according to claim 1, characterized in that, The transmission device (2) includes a hydraulic chamber (21) and a shift piston (22) slidably disposed in the hydraulic chamber (21). The hydraulic chamber (21) has a first oil port (211) and a second oil port (212) at both ends along the sliding direction of the shift piston (22). The control valve (32) is used to control the connection and disconnection between the high-pressure oil circuit (33) and the first oil port (211) and the second oil port (212).

3. The transmission hydraulic system according to claim 2, characterized in that, The control valve (32) is provided with a first input port (321), a first output port (322), a first connecting port (323) and a second connecting port (324). The high-pressure oil circuit (33) includes a first oil circuit (331), a second oil circuit (332) and a third oil circuit (333). The first oil circuit (331) is connected to the oil supply device (1) and the first input port (321). The second oil circuit (332) is connected to the first connecting port (323) and the first oil port (211). The third oil circuit (333) is connected to the second connecting port (324) and the second oil port (212). The first output port (322) is connected to the oil supply device (1). The first mechanical pump (31) is located in the first oil circuit (331). The control valve (32) has a first position (325), a second position (326) and a third position (327). In the first position (325), the first input port (321) and the first output port (322) are disconnected from the first communication port (323) and the second communication port (324). In the second position (326), the first input port (321) is connected to the first communication port (323), and the second communication port (324) is connected to the first output port (322). In the third position (327), the first input port (321) is connected to the second communication port (324), and the first communication port (323) is connected to the first output port (322).

4. The transmission hydraulic system according to any one of claims 1 to 3, characterized in that, The control valve (32) is a flow solenoid valve.

5. The transmission hydraulic system according to claim 1, characterized in that, The high-pressure oil circuit (33) includes a first section (3311), a second section (3312), a third section (3313) and a fourth section (3314). The first mechanical pump (31) has a first pump port (311) and a second pump port (312). The high-pressure module (3) also includes a first check valve (34) and a second check valve (35). The first section (3311) is connected to the oil supply device (1) and the first pump port (311), the second section (3312) is connected to the second pump port (312) and the control valve (32), and the first check valve (34) is provided in the first section (3311) so that the oil in the first section (3311) flows from the oil supply device (1) to the first pump port (311). The third section (3313) connects the oil supply device (1) and the second pump port (312), the fourth section (3314) connects the first pump port (311) and the control valve (32), and the second check valve (35) is located in the third section (3313) so that the oil in the third section (3313) flows from the oil supply device (1) to the second pump port (312).

6. The transmission hydraulic system according to claim 1, characterized in that, The cooling oil circuit (43) includes a fifth section (431), a sixth section (432), a seventh section (433) and an eighth section (434). The second mechanical pump (41) has a third pump port (411) and a fourth pump port (412). The cooling module (4) also includes a third check valve (44) and a fourth check valve (45). The fifth section (431) connects the oil supply device (1) and the third pump port (411), the sixth section (432) is connected to the fourth pump port (412), and the third check valve (44) is located in the fifth section (431) so that the oil in the fifth section (431) flows from the oil supply device (1) to the third pump port (411). The seventh segment (433) is connected to the oil supply device (1) and the fourth pump port (412), the eighth segment (434) is connected to the third pump port (411), and the fourth check valve (45) is located in the seventh segment (433) so that the oil in the seventh segment (433) flows from the oil supply device (1) to the fourth pump port (412).

7. The transmission hydraulic system according to claim 1, characterized in that, The cooling module (4) also includes a switching valve (46), and the end of the cooling oil circuit (43) away from the oil supply device (1) is used to connect with the first motor (P1). The switching valve (46) is used to control the connection and disconnection between the cooling oil circuit (43) and the first motor (P1).

8. The transmission hydraulic system according to claim 1, characterized in that, The transmission hydraulic system also includes a pressure regulating module (5), which includes a slide valve (51) and a pressure regulating oil circuit (52). The pressure regulating oil circuit (52) is connected to the high-pressure oil circuit (33) and the cooling oil circuit (43). The slide valve (51) is used to control the opening and closing of the pressure regulating oil circuit (52).

9. The transmission hydraulic system according to claim 1, characterized in that, The high-pressure module (3) further includes a first safety oil circuit (36) and a first safety valve (37) disposed in the first safety oil circuit (36). The first safety oil circuit (36) is connected to the high-pressure oil circuit (33) and the oil supply device (1).

10. A vehicle, characterized in that, Includes the transmission hydraulic system as described in any one of claims 1-9.

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