Hydraulic system of transmission and vehicle

Abstract

The hydraulic system comprises a high-pressure oil pump, a low-pressure oil pump and an oil tank, an inlet of the high-pressure oil pump is connected to the oil tank through a first oil way, and an inlet of the low-pressure oil pump is connected to the oil tank through a second oil way; one end of the high-pressure oil way is connected with an outlet of the high-pressure oil pump, the other end of the high-pressure oil way is connected to the energy accumulator, and the high-pressure oil way is connected with a reversing assembly; one end of the lubricating oil way is connected with an outlet of the low-pressure oil pump, and the other end of the lubricating oil way is connected to the to-be-lubricated mechanism and the reversing assembly; one end of the gear shifting oil way is connected to one end of the reversing assembly, the other end of the gear shifting oil way is connected to the gear shifting fork piston, and the reversing assembly is used for enabling the high-pressure oil way to be communicated with the lubricating oil way and the gear shifting oil way in a switchable mode. According to the scheme, the different oil pumps can be controlled through one motor to conduct gear shifting, the cost is reduced, the working number of the oil pumps can be reduced during gear shifting, and consumed energy is reduced.

Description

Technical Field

[0001] The present application relates to the field of automobile transmission technology, and in particular to a transmission hydraulic system and a vehicle. Background Art

[0002] The hydraulic system of the transmission is an important part of the automatic transmission. It is responsible for regulating and controlling the transmission's shifting process to ensure that the transmission can smoothly and accurately switch between different gears. During the transmission's shifting and daily operation, the hydraulic system generally uses oil cooling to cool and lubricate various parts of the transmission, reduce friction on the friction surface, thereby reducing wear, and uses an oil pump to increase the oil pressure in the oil circuit to improve the reliability of the vehicle's shifting.

[0003] However, in current hydraulic systems, multiple motors are generally required to control different oil pumps to control the oil pressure in the oil circuit, which is costly and difficult to operate. In addition, when shifting gears, multiple oil pumps are required to work simultaneously, consuming too many resources. Summary of the invention

[0004] In order to solve or partially solve the problems existing in the related art, the present application provides a hydraulic system and vehicle of a transmission, which can control different oil pumps for gear shifting through an electric motor, thereby reducing costs, and can reduce the number of oil pump operations during gear shifting, thereby reducing energy consumption.

[0005] In a first aspect, the present application provides a hydraulic system of a transmission, comprising a high-pressure oil pump, a low-pressure oil pump and an oil tank, wherein an inlet of the high-pressure oil pump is connected to the oil tank through a first oil circuit, and an inlet of the low-pressure oil pump is connected to the oil tank through a second oil circuit;

[0006] A high-pressure oil circuit, one end of which is connected to the outlet of the high-pressure oil pump, the other end of which is connected to the accumulator, and a reversing assembly is connected to the high-pressure oil circuit;

[0007] A lubricating oil circuit, one end of which is connected to the outlet of the low-pressure oil pump, and the other end of which is respectively connected to the mechanism to be lubricated and the reversing assembly;

[0008] A shift oil circuit, one end of which is connected to one end of the reversing assembly, and the other end of which is connected to the shift fork piston, the reversing assembly being used to switchably connect the high-pressure oil circuit to the lubricating oil circuit and the shift oil circuit;

[0009] The high-pressure oil pump supplies oil to the shift fork piston through the high-pressure oil circuit and the shift oil circuit, and the low-pressure oil pump supplies oil to the mechanism to be lubricated through the lubricating oil circuit.

[0010] In combination with the first aspect, in a possible implementation of the first aspect, it also includes: a motor, an output end of which is connected to the high-pressure oil pump and the low-pressure oil pump, and the motor is used to drive the high-pressure oil pump and the low-pressure oil pump to rotate coaxially.

[0011] In combination with the first aspect, in a possible implementation of the first aspect, it also includes: a connecting oil circuit, one end of the connecting oil circuit is connected to the reversing assembly, and the other end of the connecting oil circuit is connected to the lubricating oil circuit, and a first one-way valve is arranged on the connecting oil circuit, and the first one-way valve is used to control the oil in the reversing assembly to flow unidirectionally to the lubricating oil circuit via the connecting oil circuit.

[0012] In combination with the first aspect, in a possible implementation of the first aspect, the lubricating oil circuit includes a main lubrication circuit and a lubrication branch circuit, one end of the main lubrication circuit is connected to the low-pressure oil pump, and the other end of the main lubrication circuit is connected in series to the first filter, the liquid cooler and the mechanism to be lubricated in sequence; the lubrication branch circuit is connected in parallel to the oil circuit between the first filter and the liquid cooler, and a second one-way valve is arranged on the lubrication branch circuit, and the second one-way valve is used to control the oil in the connecting oil circuit to flow unidirectionally to the mechanism to be lubricated via the lubrication branch circuit.

[0013] In combination with the first aspect, in a possible implementation of the first aspect, the high-pressure oil circuit includes a main oil circuit, a first branch and a second branch, one end of the main oil circuit is connected to the high-pressure oil pump, and the other end of the main oil circuit is respectively connected to one end of the first branch and one end of the second branch; a third one-way valve is arranged on the first branch, and the third one-way valve is used to control the oil in the first branch to flow unidirectionally to the reversing assembly via the first branch; a fourth one-way valve and the accumulator are arranged on the second branch, and the fourth one-way valve is used to control the oil in the second branch to flow unidirectionally to the reversing assembly and / or the accumulator via the second branch.

[0014] In combination with the first aspect, in a possible implementation of the first aspect, a pressure sensor for monitoring the pressure of the high-pressure oil circuit is further provided on the second branch, and the accumulator adjusts the pressure of the high-pressure oil circuit according to the pressure of the high-pressure oil circuit.

[0015] In combination with the first aspect, in a possible implementation of the first aspect, a pressure regulating solenoid valve and a first flow control solenoid valve are provided in the shift oil circuit, the pressure regulating solenoid valve is used to adjust the oil pressure in the shift oil circuit, and the first flow control solenoid valve is used to adjust the oil amount in the shift oil circuit; one end of the pressure regulating solenoid valve is connected to one end of the reversing assembly, and the other end of the pressure regulating solenoid valve is connected to one end of the first flow control solenoid valve; one end of the first flow solenoid valve is connected to the pressure regulating solenoid valve, and the other end of the first flow solenoid valve is connected to the shift fork piston.

[0016] In combination with the first aspect, in a possible implementation of the first aspect, the reversing assembly includes a second flow control solenoid valve, and the second flow control solenoid valve is used to switch the high-pressure oil circuit to the lubrication oil circuit or the shift oil circuit.

[0017] In combination with the first aspect, in a possible implementation manner of the first aspect, the first oil circuit and the second oil circuit are provided with the same second filter.

[0018] A second aspect of the present application provides a vehicle comprising a hydraulic system of the transmission as described above.

[0019] The technical solution provided by this application may have the following beneficial effects:

[0020] The hydraulic system and vehicle of the transmission of the present application include a high-pressure oil pump, a low-pressure oil pump and an oil tank, wherein the inlet of the high-pressure oil pump is connected to the oil tank through a first oil circuit, and the inlet of the low-pressure oil pump is connected to the oil tank through a second oil circuit; a high-pressure oil circuit, wherein one end of the high-pressure oil circuit is connected to the outlet of the high-pressure oil pump, and the other end of the high-pressure oil circuit is connected to an accumulator, and a reversing assembly is connected to the high-pressure oil circuit; a lubricating oil circuit, wherein one end of the lubricating oil circuit is connected to the outlet of the low-pressure oil pump, and the other end thereof is respectively connected to a mechanism to be lubricated and a reversing assembly; a shift oil circuit, wherein one end of the shift oil circuit is connected to one end of the reversing assembly, and the other end thereof is connected to a shift fork piston, and the reversing assembly is used to switchably connect the high-pressure oil circuit to the lubricating oil circuit and the shift oil circuit; the high-pressure oil pump supplies oil to the shift fork piston through the high-pressure oil circuit and the shift oil circuit, and the low-pressure oil pump supplies oil to the mechanism to be lubricated through the lubricating oil circuit, and can control different oil pumps to shift gears through one motor, thereby reducing costs, and reducing the number of oil pump operations and energy consumption during shifting gears.

[0021] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other objects, features and advantages of the present application will become more apparent by describing in more detail exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0023] Figure 1 It is a flow chart of the hydraulic system of the transmission shown in the embodiment of the present application.

[0024] Figure numerals: 1. high-pressure oil pump; 2. low-pressure oil pump; 3. oil tank; 301. first oil circuit; 302. second oil circuit; 303. second filter; 304. motor; 4. high-pressure oil circuit; 401. main oil circuit; 402. first branch; 403. second branch; 404. third one-way valve; 405. fourth one-way valve; 406. pressure sensor; 5. lubricating oil circuit; 501. main lubricating circuit; 502. lubricating branch; 503. first filter; 504. liquid cooler; 505. mechanism to be lubricated; 506. second one-way valve; 6. shift oil circuit; 601. pressure regulating solenoid valve; 602. first flow control solenoid valve; 7. accumulator; 8. reversing assembly; 801. second flow control solenoid valve; 9. connecting oil circuit; 901. first one-way valve; 10. shift fork piston. DETAILED DESCRIPTION

[0025] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0026] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0027] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0028] In addition, the "plurality" in the embodiments of the present application refers to two or more than two. In view of this, in the embodiments of the present application, "plurality" can also be understood as "at least two". "At least one" can be understood as one or more, for example, one, two or more. For example, including at least one means including one, two or more, and there is no limit on which ones are included. For example, including at least one of A, B and C, then A, B, C, A and B, A and C, B and C, or A, B and C can be included.

[0029] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In the related technology, the hydraulic system of the transmission is an important part of the automatic transmission. It is responsible for regulating and controlling the gear shifting process of the transmission to ensure that the transmission can smoothly and accurately switch between different gears. During the gear shifting and daily operation of the transmission, the hydraulic system generally uses oil cooling to cool and lubricate various parts of the transmission, reduce the friction of the friction surface, thereby reducing wear, and uses an oil pump to increase the oil pressure in the oil circuit to improve the reliability of the vehicle when shifting gears. The shifting mechanism of the new energy transmission is controlled by a motor, each motor can only control two gears, and lubrication is provided by an electronic pump.

[0032] In current hydraulic systems, multiple motors are generally required to control different oil pumps to control the oil pressure in the oil circuit, which is costly and difficult to operate. In addition, when shifting gears, multiple oil pumps are required to work simultaneously, consuming too many resources.

[0033] In response to the above problems, an embodiment of the present application provides a hydraulic system of a transmission, which can control different oil pumps for gear shifting through an electric motor, thereby reducing costs and reducing the number of oil pump operations during gear shifting, thereby reducing energy consumption.

[0034] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0035] Figure 1 It is a schematic diagram of the structure of the hydraulic system of the transmission shown in the embodiment of the present application.

[0036] See also Figure 1 A hydraulic system of a transmission includes: a high-pressure oil pump 1, a low-pressure oil pump 2 and an oil tank 3. The inlet of the high-pressure oil pump 1 is connected to the oil tank 3 through a first oil circuit 301, and the inlet of the low-pressure oil pump 2 is connected to the oil tank 3 through a second oil circuit 302. The capacity of the oil tank 3 can be set as needed to be used by the high-pressure oil pump 1 and the low-pressure oil pump 2. By setting the high-pressure oil pump 1 and the low-pressure oil pump 2 connected to the oil tank 3, oil supply can be achieved on demand, thereby improving the oil supply efficiency of the hydraulic system.

[0037] The high-pressure oil pump 1 and the low-pressure oil pump 2 are the most basic components in the fuel supply system of the engine. The high-pressure oil pump 1 can generate enough pressure to spray the fuel into the combustion chamber of the engine. When the fuel reaches the required high pressure, the oil outlet valve will open and output the high-pressure fuel to the fuel nozzle or injector. The high-pressure fuel will be atomized or sprayed into the engine combustion chamber through the nozzle, so that the fuel will be completely burned to generate power; compared with the high-pressure oil pump 1, the low-pressure oil pump 2 generates lower pressure and is mainly used to transport fuel from the fuel tank 3 to the high-pressure oil pump 1. After the fuel is sucked into the pump, the pump sends the fuel into the fuel system through the rotation of the impeller. At the outlet of the oil pump, there is usually an exhaust valve to prevent fuel backflow.

[0038] High-pressure oil circuit 4, one end of the high-pressure oil circuit 4 is connected to the outlet of the high-pressure oil pump 1, and the other end of the high-pressure oil circuit 4 is connected to the accumulator 7. The high-pressure oil circuit 4 is connected to a reversing component 8, and the reversing component 8 can reverse the oil circuit of the high-pressure oil circuit 4; lubricating oil circuit 5, one end of the lubricating oil circuit 5 is connected to the outlet of the low-pressure oil pump 2, and the other end thereof is respectively connected to the lubricating mechanism 505 and the reversing component 8, the high-pressure oil pump 1 is connected to the high-pressure oil circuit 4, and the low-pressure oil pump 2 is connected to the lubricating oil circuit 5, which simplifies the hydraulic system, reduces the production cost of the hydraulic system, and improves the safety and reliability of the hydraulic system.

[0039] The accumulator 7, also known as the hydraulic accumulator 7, is an elastic body formed by liquid sealing. It is mainly composed of two relatively moving pistons and a diaphragm, which can store and release the pressure energy in the hydraulic system. The accumulator 7 can provide the necessary power for the gearbox hydraulic system, including pressure and flow, to ensure the normal operation of the transmission. During the process of shifting, accelerating, decelerating, etc., the hydraulic system will produce a large pressure shock. The accumulator 7 can absorb these shocks, eliminate pulsation, and protect the transmission from damage. When braking, the pressure in the hydraulic system causes the liquid to enter the accumulator 7 through the piston, and squeeze the diaphragm to compress the gas in the accumulator 7. As the gas is compressed, the pressure and energy in the accumulator 7 also increase. When it reaches a certain level, the energy is stored in the accumulator 7. When accelerating, the compressed gas in the accumulator 7 will push the liquid back to the hydraulic system, releasing the stored energy to improve the fuel economy and driving stability of the car.

[0040] The shift oil circuit 6, one end of the shift oil circuit 6 is connected to one end of the reversing assembly 8, and the other end of the shift oil circuit 6 is connected to the shift fork piston 10. The shift fork piston is usually composed of a piston body, a shift fork part, and related connections and sealing structures. The piston body has one or more sealed chambers for containing and storing hydraulic oil, and the shift fork part is used to engage or separate with the gears in the transmission to achieve the shifting operation. When the driver operates the shift lever, the shift fork piston receives the operating force through a series of mechanical transmission devices. The piston moves under the action of the hydraulic oil, pushing the shift fork to move along the axial direction, thereby changing the meshing state of the gears and achieving the shifting operation of different transmission ratios. Specifically, the movement of the piston will drive one end of the shift fork to engage with the tooth groove of the target gear, and at the same time separate the tooth grooves of other gears from the fork, thereby realizing the shifting function of the car. The reversing assembly 8 is used to switchably connect the high-pressure oil circuit 4 to the lubricating oil circuit 5 and the shift oil circuit 6; the high-pressure oil pump 1 supplies oil to the shift fork piston 10 through the high-pressure oil circuit 4 and the shift oil circuit 6, and the low-pressure oil pump 2 supplies oil to the lubricated mechanism 505 through the lubricating oil circuit 5.

[0041] The hydraulic system and vehicle of the transmission of the present application include a high-pressure oil pump 1, a low-pressure oil pump 2 and an oil tank 3, wherein the inlet of the high-pressure oil pump 1 is connected to the oil tank 3 through a first oil circuit 301, and the inlet of the low-pressure oil pump 2 is connected to the oil tank 3 through a second oil circuit 302; a high-pressure oil circuit 4, one end of which is connected to the outlet of the high-pressure oil pump 1, and the other end of which is connected to an accumulator 7, and a reversing assembly 8 is connected to the high-pressure oil circuit 4; a lubricating oil circuit 5, one end of which is connected to the outlet of the low-pressure oil pump 2, and the other end of which is respectively connected to a lubricating mechanism 505 and a lubricating mechanism 506. A reversing assembly 8; a shift oil circuit 6, one end of the shift oil circuit 6 is connected to one end of the reversing assembly 8, and the other end thereof is connected to the shift fork piston 10, and the reversing assembly 8 is used to enable the high-pressure oil circuit 4 to be switchably connected to the lubricating oil circuit 5 and the shift oil circuit 6; the high-pressure oil pump 1 supplies oil to the shift fork piston 10 through the high-pressure oil circuit 4 and the shift oil circuit 6, and the low-pressure oil pump 2 supplies oil to the lubricated mechanism 505 through the lubricating oil circuit 5. Different oil pumps can be controlled by one motor to shift gears, thereby reducing costs, and the number of oil pump operations can be reduced during shifting gears, thereby reducing energy consumption.

[0042] In a possible embodiment, a motor is also included, the output end of the motor is connected to the high-pressure oil pump 1 and the low-pressure oil pump 2, the motor is used to drive the high-pressure oil pump 1 and the low-pressure oil pump 2 to rotate coaxially, and the motor can drive the high-pressure oil pump 1 and the low-pressure oil pump 2 to supply oil to the high-pressure oil circuit 4 and the lubricating oil circuit 5 respectively.

[0043] In a possible embodiment, it also includes: a connecting oil circuit 9, one end of the connecting oil circuit 9 is connected to the reversing component 8, and the other end thereof is connected to the lubricating oil circuit 5, and a first one-way valve 901 is provided on the connecting oil circuit 9. The first one-way valve 901 is used to control the oil in the reversing component 8 to flow to the lubricating oil circuit 5 in one direction via the connecting oil circuit 9. The oil in the high-pressure oil circuit 4 can flow to the lubricating oil circuit 5 through the connecting oil circuit 9 when needed, which is convenient for control.

[0044] In a possible embodiment, the lubricating oil circuit 5 includes a main lubricating circuit 501 and a lubricating branch circuit 502. One end of the main lubricating circuit 501 is connected to the low-pressure oil pump 2, and the other end of the main lubricating circuit 501 is connected in series to the first filter 503, the liquid cooler 504 and the mechanism to be lubricated 505 in sequence; the lubricating branch circuit 502 is connected in parallel to the oil circuit between the first filter 503 and the liquid cooler 504, and a second one-way valve 506 is arranged on the lubricating branch circuit 502. The second one-way valve 506 is used to control the oil in the connecting oil circuit 9 to flow unidirectionally to the mechanism to be lubricated 505 via the lubricating branch circuit 502. The lubricating oil circuit 5 can supply oil to the mechanism to be lubricated 505, and the mechanism to be lubricated 505 can be one of a gear system, a generator, a motor, and a bearing system. The first filter 503 can filter the oil in the oil circuit so that the oil entering the lubricated mechanism 505 is purified, which can increase the service life of the lubricated mechanism 505. The liquid cooler 504 can cool the oil in the oil circuit to avoid the oil temperature entering the lubricated mechanism 505 being too high, and can also cool the oil returning from the lubricated mechanism 505.

[0045] In a possible embodiment, the high-pressure oil circuit 4 includes a main oil circuit 401, a first branch 402 and a second branch 403, one end of the main oil circuit 401 is connected to the high-pressure oil pump 1, and the other end of the main oil circuit 401 is respectively connected to one end of the first branch 402 and one end of the second branch 403; a third one-way valve 404 is arranged on the first branch 402, and the third one-way valve 404 is used to control the oil in the first branch 402 to flow unidirectionally to the reversing assembly 8 via the first branch 402; a fourth one-way valve 405 and an accumulator 7 are arranged on the second branch 403, and the fourth one-way valve 405 is used to control the oil in the second branch 403 to flow unidirectionally to the reversing assembly 8 and / or the accumulator 7 via the second branch 403.

[0046] In a possible implementation, a pressure sensor 406 for monitoring the pressure of the high-pressure oil circuit 4 is also provided on the second branch 403. The accumulator 7 adjusts the pressure of the high-pressure oil circuit 4 according to the pressure of the high-pressure oil circuit 4. The pressure sensor 406 monitors the pressure of the high-pressure oil circuit 4. When the pressure is insufficient, the high-pressure oil pump 1 supplies oil until the pressure reaches a threshold value.

[0047] In a possible implementation, the shift oil circuit 6 is provided with a pressure regulating solenoid valve 601 and a first flow control solenoid valve 602. The pressure regulating solenoid valve 601 is used to regulate the oil pressure in the shift oil circuit 6. When shifting, if the oil pressure in the shift oil circuit 6 is too high, the pressure regulating valve can increase the oil pressure in the shift oil circuit 6. If the oil pressure in the shift oil circuit 6 is too low, the pressure regulating valve can reduce the oil pressure in the shift oil circuit 6. Both can regulate the motor, thereby reducing or increasing the working intensity of the high-pressure oil pump 1. The pressure regulating valve can also be connected to an external component; the first flow control solenoid valve 602 is used to regulate the oil pressure in the shift oil circuit 6. The magnetic valve 602 is used to adjust the amount of oil in the shift oil circuit 6, which can increase or decrease the amount of oil supplied to the shift fork piston 10, and can be used to switch the pistons on the left and right sides of the shift fork piston when the oil enters. The first flow control solenoid valve 602 can be connected to external components; one end of the pressure regulating solenoid valve 601 is connected to one end of the reversing assembly 8, and the other end of the pressure regulating solenoid valve 601 is connected to one end of the first flow control solenoid valve 602; one end of the first flow solenoid valve is connected to the pressure regulating solenoid valve 601, and the other end of the first flow solenoid valve is connected to the shift fork piston 10.

[0048] In one possible embodiment, the reversing assembly 8 includes a second flow control solenoid valve 801, which is used to switch the high-pressure oil circuit 4 to the lubricating oil circuit 5 or the shift oil circuit 6. When shifting is required, the reversing assembly 8 can switch the oil in the high-pressure oil circuit 4 to the shift oil circuit 6, supply pressure to the shift fork piston 10, and shift gears. It can also return the oil to the shift oil circuit 6 and fill the oil in the low-pressure oil pump 2 into the high-pressure oil pump 1, thereby reducing the working intensity of the low-pressure oil pump 2 and thereby reducing the loss of oil and energy.

[0049] In one possible embodiment, the same second filter 303 is provided on the first oil circuit 301 and the second oil circuit 302. The oil is filtered by the second filter 303 before entering the high-pressure oil pump 1 and the low-pressure oil pump 2, thereby reducing impurities in the oil, ensuring the stable operation of the high-pressure oil pump 1 and the low-pressure oil pump 2, protecting the lubricating oil circuit 5 and the high-pressure oil circuit 4, and avoiding damage to the high-pressure oil pump 1, the low-pressure oil pump 2, the lubricating oil circuit 5 and the high-pressure oil circuit 4 by impurities.

[0050] The present application also includes a vehicle comprising the hydraulic system of the transmission as above.

[0051] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A hydraulic system for a transmission, characterized in that: include: A high-pressure oil pump, a low-pressure oil pump and an oil tank, wherein the inlet of the high-pressure oil pump is connected to the oil tank through a first oil path, and the inlet of the low-pressure oil pump is connected to the oil tank through a second oil path; A high-pressure oil circuit, one end of which is connected to the outlet of the high-pressure oil pump, the other end of which is connected to the accumulator, and a reversing assembly is connected to the high-pressure oil circuit; A lubricating oil circuit, one end of which is connected to the outlet of the low-pressure oil pump, and the other end of which is respectively connected to the mechanism to be lubricated and the reversing assembly; A shift oil circuit, one end of which is connected to one end of the reversing assembly, and the other end of which is connected to the shift fork piston, wherein the reversing assembly is used to switchably connect the high-pressure oil circuit to the lubricating oil circuit and the shift oil circuit; The high-pressure oil pump supplies oil to the shift fork piston through the high-pressure oil circuit and the shift oil circuit, and the low-pressure oil pump supplies oil to the mechanism to be lubricated through the lubricating oil circuit.

2. The hydraulic system of the transmission according to claim 1, characterized in that: Also includes: A motor, wherein an output end of the motor is connected to the high-pressure oil pump and the low-pressure oil pump, and the motor is used to drive the high-pressure oil pump and the low-pressure oil pump to rotate coaxially.

3. The hydraulic system of the transmission according to claim 2, characterized in that: Also includes: A connecting oil circuit, one end of which is connected to the reversing assembly, and the other end of which is connected to the lubricating oil circuit. A first one-way valve is provided on the connecting oil circuit, and the first one-way valve is used to control the oil in the reversing assembly to flow in one direction to the lubricating oil circuit via the connecting oil circuit.

4. The hydraulic system of the transmission according to claim 3, characterized in that: The lubricating oil circuit comprises a main lubricating circuit and a lubricating branch circuit, one end of the main lubricating circuit is connected to the low-pressure oil pump, and the other end of the main lubricating circuit is connected in series to the first filter, the liquid cooler and the lubricated mechanism in sequence; The lubrication branch is connected in parallel with the oil circuit between the first filter and the liquid cooler. A second one-way valve is provided on the lubrication branch. The second one-way valve is used to control the oil in the connecting oil circuit to flow in one direction to the mechanism to be lubricated via the lubrication branch.

5. The hydraulic system of the transmission according to claim 2, characterized in that: The high-pressure oil circuit comprises a main oil circuit, a first branch circuit and a second branch circuit, one end of the main oil circuit is connected to the high-pressure oil pump, and the other end of the main oil circuit is connected to one end of the first branch circuit and one end of the second branch circuit respectively; A third one-way valve is provided on the first branch, and the third one-way valve is used to control the oil in the first branch to flow to the reversing assembly in one direction via the first branch; A fourth one-way valve and the accumulator are provided on the second branch, and the fourth one-way valve is used to control the oil in the second branch to flow unidirectionally to the reversing assembly and / or the accumulator via the second branch.

6. The hydraulic system of the transmission according to claim 5, characterized in that: The second branch line is also provided with a pressure sensor for monitoring the pressure of the high-pressure oil circuit, and the accumulator adjusts the pressure of the high-pressure oil circuit according to the pressure of the high-pressure oil circuit.

7. The hydraulic system of the transmission according to claim 1, characterized in that: The shift oil circuit is provided with a pressure regulating solenoid valve and a first flow control solenoid valve, the pressure regulating solenoid valve is used to regulate the oil pressure in the shift oil circuit, and the first flow control solenoid valve is used to regulate the oil volume in the shift oil circuit; One end of the pressure regulating solenoid valve is connected to one end of the reversing assembly, and the other end of the pressure regulating solenoid valve is connected to one end of the first flow control solenoid valve; One end of the first flow solenoid valve is connected to the pressure regulating solenoid valve, and the other end of the first flow solenoid valve is connected to the shift fork piston.

8. The hydraulic system of the transmission according to claim 1, characterized in that: The reversing assembly includes a second flow control solenoid valve, and the second flow control solenoid valve is used to switch the high-pressure oil circuit to the lubrication oil circuit or the shift oil circuit.

9. The hydraulic system of a transmission according to claim 1, characterized in that: The first oil circuit and the second oil circuit are provided with the same second filter.

10. A vehicle, characterized in that: A hydraulic system comprising a transmission as described in any one of claims 1 to claim 9.

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