Oil supply device and working method thereof

Abstract

The invention relates to the technical field of gearboxes and discloses an oil supply device and a working method thereof. The oil supply device comprises a high-pressure oil pump, a low-pressure oil pump and a switching valve; the two ends of the high-pressure oil pump are connected with the oil pool and the high-pressure oil way respectively, the two ends of the low-pressure oil pump are connected with the oil pool and the lubricating oil way respectively, the switching valve is connected with the high-pressure oil pump, the high-pressure oil way and the lubricating oil way respectively, and the switching valve can control the high-pressure oil pump to be communicated with the high-pressure oil way or the lubricating oil way. The high-pressure oil pump can supply oil to the high-pressure oil way through the switching valve, and when the high-pressure oil way does not need to provide pressure, the switching valve conducts switching, so that the high-pressure oil pump can supply oil to the lubricating oil way through the switching valve, and the technical problem that in the prior art, a pump in a main oil way needs to be started frequently, and the service life is affected is solved. The technical effects that the high-pressure oil pump does not need to be frequently opened and closed and the service life of the high-pressure oil pump is prolonged are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of gearboxes, and in particular to an oil supply device and a working method thereof. Background Art

[0002] The automatic transmission mainly transmits power through the main oil to complete the gear shift, so the main oil circuit pressure plays an extremely important role in the entire power output and the normal operation of the transmission. There is also a secondary oil circuit for lubrication in the automatic transmission, so two pumps are needed to supply oil in the automatic transmission, one pump supplies oil to the main oil circuit, and the other pump supplies oil to the lubrication oil circuit. However, the automatic transmission does not need to shift gears at all times. When the automatic transmission does not need to shift gears, the oil pressure in the main oil circuit gradually increases with the oil supply of the pump, so the pump on the main oil circuit needs to be turned off and turned on again after the oil pressure in the main oil circuit drops to a certain level, resulting in the pump in the main oil circuit needing to be frequently turned on and off, affecting the service life of the pump in the main oil circuit. Summary of the invention

[0003] The object of the present invention is to provide an oil supply device and a working method thereof, so as to solve the technical problem in the prior art that the pump in the main oil circuit needs to be started frequently, thus affecting the service life.

[0004] In order to solve the above technical problems, the present invention provides an oil supply device, including a high-pressure oil pump, a low-pressure oil pump and a switching valve; The two ends of the high-pressure oil pump are respectively connected to the oil pool and the high-pressure oil circuit, the two ends of the low-pressure oil pump are respectively connected to the oil pool and the lubricating oil circuit, the switching valve is respectively connected to the high-pressure oil pump, the high-pressure oil circuit and the lubricating oil circuit, and the switching valve can control the high-pressure oil pump to be connected to the high-pressure oil circuit or the lubricating oil circuit.

[0005] In an optional embodiment, it also includes a drive motor and a controller; The driving motor is connected to the high-pressure oil pump and the low-pressure oil pump respectively, and the driving motor drives the high-pressure oil pump and the low-pressure oil pump to rotate synchronously; The controller is connected to the driving motor via an electrical signal, and the controller is used to control the rotation speed of the driving motor.

[0006] In an optional embodiment, the controller is connected to the switching valve via an electrical signal, and the controller is capable of controlling the switching of the switching valve.

[0007] In an optional embodiment, an oil pressure detector and a flow detector are also included. The oil pressure detector is connected to the high-pressure oil circuit, and the flow detector is connected to the lubricating oil circuit. The oil pressure detector and the flow detector are respectively connected to the controller electrical signal. The oil pressure detector is used to detect the oil pressure of the high-pressure oil circuit, and the flow detector is used to detect the flow of the lubricating oil circuit.

[0008] In an optional embodiment, the high-pressure oil circuit includes an accumulator, a valve plate and a clutch; Both ends of the valve plate are respectively communicated between the switching valve and the clutch, and one end of the accumulator is communicated between the switching valve and the valve plate.

[0009] In an optional embodiment, the switching valve includes a valve body and a housing; The housing is provided with an accommodating chamber for accommodating the valve body, the valve body is slidably connected to the accommodating chamber, the high-pressure oil circuit, the lubricating oil circuit and the output end of the high-pressure oil pump are respectively connected to the accommodating chamber, and the valve body slides to connect the high-pressure oil circuit with the high-pressure oil pump, or to connect the high-pressure oil pump with the lubricating oil circuit.

[0010] In an optional embodiment, the housing is provided with a first connecting hole, a second connecting hole and a third connecting hole, the first connecting hole, the second connecting hole and the third connecting hole are respectively connected to the accommodating chamber, the first connecting hole is connected to the high-pressure oil circuit, the second connecting hole is connected to the high-pressure oil pump, and the third connecting hole is connected to the lubricating oil circuit; A connecting groove is provided on the valve body, and the connecting groove is arranged along the circumference of the valve body. When the connecting groove slides relative to the inner wall of the accommodating cavity, the connecting groove can connect the first connecting hole and the second connecting hole, or connect the second connecting hole and the third connecting hole.

[0011] In an optional embodiment, the switching valve also includes an elastic member, both ends of which are respectively connected to the valve body and the inner wall of the accommodating chamber, and the elastic member has a tendency to cause the valve body to move in a direction connecting the high-pressure oil pump and the high-pressure oil circuit.

[0012] The present invention also provides a working method of the oil supply device, comprising the following steps: When the oil pressure in the high-pressure oil circuit is within a first preset oil pressure range, the control switch valve is switched to connect the high-pressure oil pump to the high-pressure oil circuit and the low-pressure oil pump to the lubricating oil circuit; When the oil pressure in the high-pressure oil circuit is higher than the upper limit value of the first preset oil pressure range, the control switching valve is switched to connect the high-pressure oil pump to the lubricating oil circuit, and the low-pressure oil pump is connected to the lubricating oil circuit at the same time; When the oil pressure in the high-pressure oil circuit is lower than the lower limit of the first preset oil pressure range, the control switching valve is switched to connect the high-pressure oil pump to the high-pressure oil circuit, and the low-pressure oil pump is connected to the lubricating oil circuit at the same time.

[0013] In an optional embodiment, the method further comprises the following steps: When the oil pressure in the high-pressure oil circuit is higher than the upper limit value of the first preset oil pressure range, the rotation speeds of the high-pressure oil pump and the low-pressure oil pump are reduced so that the flow rate in the lubricating oil circuit meets the preset value; And / or, when the oil pressure in the high-pressure oil circuit is lower than the lower limit of the first preset oil pressure range, the rotation speeds of the high-pressure oil pump and the low-pressure oil pump are increased so that the flow rate in the lubricating oil circuit meets the preset value.

[0014] The present invention provides an oil supply device, comprising a high-pressure oil pump, a low-pressure oil pump and a switching valve; two ends of the high-pressure oil pump are respectively connected to an oil pool and a high-pressure oil circuit, while two ends of the low-pressure oil pump are respectively connected to an oil pool and a lubricating oil circuit, and the switching valve is respectively connected to the high-pressure oil pump, the high-pressure oil circuit and the lubricating oil circuit, and the switching valve can control the high-pressure oil pump to be connected to the high-pressure oil circuit or the lubricating oil circuit. When the high-pressure oil circuit requires pressure, the high-pressure oil pump can supply oil to the high-pressure oil circuit via the switching valve, and when the high-pressure oil circuit does not need to provide pressure, the switching valve is switched so that the high-pressure oil pump can supply oil to the lubricating oil circuit via the switching valve, thereby solving the technical problem in the prior art that the pump in the main oil circuit needs to be started frequently, thus affecting its service life, and achieving the technical effect that the high-pressure oil pump does not need to be frequently started and closed, thereby extending the service life of the high-pressure oil pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The oil supply device mentioned in the embodiment of the present invention; Figure 2 As mentioned in the embodiments of the present invention; Figure 3 As mentioned in the embodiments of the present invention; Figure 4 It is mentioned in the embodiments of the present invention.

[0016] In the figure, 1-high-pressure oil pump; 2-low-pressure oil pump; 3-switching valve; 301-valve body; 302-housing; 303-elastic member; 304-first connecting hole; 305-second connecting hole; 306-third connecting hole; 307-connecting groove; 4-high-pressure oil circuit; 401-accumulator; 402-valve plate; 403-clutch; 5-lubricating oil circuit; 6-oil pool. DETAILED DESCRIPTION

[0017] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] In the related technology, the automatic transmission does not need to shift gears frequently. During the time when the automatic transmission does not need to shift gears, the oil pressure in the main oil circuit gradually increases with the oil supply of the pump, so the pump needs to be turned off and then turned on again after the oil pressure drops to a certain level. As a result, the pump in the main oil circuit needs to be frequently started and closed, affecting the service life of the pump in the main oil circuit.

[0020] In view of this, if Figure 1-Figure 4 As shown, some embodiments of the present invention provide an oil supply device, including a high-pressure oil pump 1, a low-pressure oil pump 2 and a switching valve 3; the two ends of the high-pressure oil pump 1 are respectively connected to the oil pool 6 and the high-pressure oil circuit 4, the two ends of the low-pressure oil pump 2 are respectively connected to the oil pool 6 and the lubricating oil circuit 5, the switching valve 3 is respectively connected to the high-pressure oil pump 1, the high-pressure oil circuit 4 and the lubricating oil circuit 5, and the switching valve 3 can control the high-pressure oil pump 1 to be connected to the high-pressure oil circuit 4 or the lubricating oil circuit 5.

[0021] In the above embodiment, the high-pressure oil pump 1 and the low-pressure oil pump 2 can be respectively arranged on the gearbox of the automobile. The high-pressure oil pump 1 and the low-pressure oil pump 2 can use oil pumps with different parameters. An oil pool 6 is arranged at the bottom of the gearbox. The oil pool 6 contains lubricating oil. The high-pressure oil pump 1 and the low-pressure oil pump 2 respectively extract lubricating oil from the oil pool 6, and then the high-pressure oil pump 1 pumps the lubricating oil to the switching valve 3, and the low-pressure oil pump 2 pumps the lubricating oil to the lubricating oil circuit 5. The switching valve 3 is provided with three interfaces. The high-pressure oil pump 1, the high-pressure oil circuit 4 and the lubricating oil circuit 5 are respectively connected to the three interfaces on the switching valve 3. The switching valve 3 can connect the high-pressure oil pump 1 with the high-pressure oil circuit 4, or the high-pressure oil pump 1 with the lubricating oil circuit 5, so that when the high-pressure oil pump 1 needs to supply oil to the high-pressure oil circuit 4, The high-pressure oil pump 1 is connected to the high-pressure oil circuit 4 through the switching valve 3. The high-pressure oil pump 1 cannot be connected to the lubricating oil circuit 5, while the low-pressure oil pump 2 is always connected to the lubricating oil circuit 5 and supplies oil to the lubricating oil circuit 5. After the oil pressure of the high-pressure oil pump 1 reaches a certain value, the switching valve 3 is switched, and the high-pressure oil pump 1 is connected to the lubricating oil circuit 5 through the switching valve 3, so that the high-pressure oil pump 1 and the low-pressure oil pump 2 pump oil to the lubricating oil circuit 5 at the same time, avoiding the frequent opening and closing of the high-pressure oil pump 1 and resulting in a reduction in the service life. At the same time, when the high-pressure oil pump 1 and the low-pressure oil pump 2 supply oil to the lubricating oil circuit 5 at the same time, the rotation speed of the high-pressure oil pump 1 and the low-pressure oil pump 2 can be reduced, thereby reducing the power consumption of the high-pressure oil pump 1 and the low-pressure oil pump 2, improving the efficiency of the hydraulic system, and extending the service life of the high-pressure oil pump 1 and the low-pressure oil pump 2.

[0022] Some embodiments of the present invention provide an oil supply device, comprising a high-pressure oil pump 1, a low-pressure oil pump 2 and a switching valve 3; when the high-pressure oil circuit 4 requires pressure, the high-pressure oil pump 1 can supply oil to the high-pressure oil circuit 4 through the switching valve 3, and when the high-pressure oil circuit 4 reaches a preset pressure, there is no need for the high-pressure oil pump 1 to continue to supply lubricating oil, and the switching valve 3 is switched so that the high-pressure oil pump 1 can supply oil to the lubricating oil circuit 5 through the switching valve 3, thereby solving the technical problem in the prior art that the pump in the main oil circuit needs to be started frequently, which affects the service life, and achieves the technical effect that the high-pressure oil pump 1 does not need to be frequently started and closed, thereby extending the service life of the high-pressure oil pump 1.

[0023] In an optional embodiment, it also includes a drive motor and a controller; the drive motor is connected to the high-pressure oil pump 1 and the low-pressure oil pump 2 respectively, and the drive motor drives the high-pressure oil pump 1 and the low-pressure oil pump 2 to rotate synchronously; the controller is connected to the drive motor electrical signal, and the controller is used to control the speed of the drive motor.

[0024] In the above embodiment, the drive motor is connected in the gearbox, and two drive motors can be provided, and the two drive motors are respectively connected to the high-pressure oil pump 1 and the low-pressure oil pump 2. Alternatively, one drive motor can be provided, and the drive motor can be respectively connected to the high-pressure oil pump 1 and the low-pressure oil pump 2 through a drive shaft, so that the high-pressure oil pump 1 and the low-pressure oil pump 2 can be driven to rotate synchronously by a single drive motor, thereby reducing the number of motors and saving costs. The controller can be connected to the drive motor electrical signal, and the controller can adopt a PLC control module. The controller can control the speed of the drive motor so that when the high-pressure oil pump 1 supplies oil to the high-pressure oil circuit 4, the controller controls the drive motor to adopt a higher speed to meet the needs of the low-pressure oil pump 2 supplying oil to the lubricating oil circuit 5 alone, and the high-pressure oil pump 1 supplies oil to the high-pressure oil circuit 4. When both the high-pressure oil pump 1 and the low-pressure oil pump 2 are connected to the lubricating oil circuit 5, the drive motor can be controlled by the controller to adopt a lower speed so that the high-pressure oil pump 1 and the low-pressure oil pump 2 meet the flow rate and flow requirements of the lubricating oil circuit 5.

[0025] In an optional embodiment, the controller is connected to the switching valve 3 via an electrical signal, and the controller can control the switching of the switching valve 3 .

[0026] In the above embodiment, a solenoid valve can be provided on one side of the switching valve 3, and the solenoid valve is connected to one end of the switching valve 3. The solenoid valve can input oil pressure into the switching valve 3 so that the switching valve 3 completes the conversion of the oil circuit connection. The solenoid valve can be electrically connected to the controller so that the controller can control the opening and closing of the solenoid valve through current, so that the solenoid valve can drive the switching valve 3 to switch, so that the controller can complete the switching of the switching valve 3 and realize the switching of the high-pressure oil pump 1 to the high-pressure oil circuit 4 or the lubricating oil circuit 5.

[0027] In an optional embodiment, an oil pressure detector and a flow detector are also included. The oil pressure detector is connected to the high-pressure oil circuit 4, and the flow detector is connected to the lubricating oil circuit 5. The oil pressure detector and the flow detector are respectively connected to the controller electrical signal. The oil pressure detector is used to detect the oil pressure of the high-pressure oil circuit 4, and the flow detector is used to detect the flow of the lubricating oil circuit 5.

[0028] In the above embodiment, the oil pressure detector can be set as an electronic oil pressure gauge, an oil pressure detector is provided in the high-pressure oil circuit 4, and a flow detector is provided in the lubricating oil circuit 5, and the flow detector can be set as a liquid flow measurement device. The oil pressure detector and the flow detector are respectively connected to the controller by electrical signals, and the flow detector and the oil pressure detector can transmit the flow of the lubricating oil circuit 5 and the oil pressure of the high-pressure oil circuit 4 to the controller. The controller controls the switching of the switching valve 3 according to the flow of the lubricating oil circuit 5 and the oil pressure of the high-pressure oil circuit 4 transmitted by the flow detector and the oil pressure detector, so as to realize the switching of the high-pressure oil pump 1 to be connected with the high-pressure oil circuit 4 or the lubricating oil circuit 5.

[0029] In an optional embodiment, the high-pressure oil circuit 4 includes an accumulator 401, a valve plate 402 and a clutch 403; both ends of the valve plate 402 are respectively connected between the switching valve 3 and the clutch 403, and one end of the accumulator 401 is connected between the switching valve 3 and the valve plate 402.

[0030] In the above embodiment, the accumulator 401, the valve plate 402 and the clutch 403 can be connected through a pipeline. The accumulator 401 is used to store additional pressure in the high-pressure oil circuit 4. When the oil pressure in the high-pressure oil circuit 4 drops, the accumulator 401 can release the stored lubricating oil to offset the leakage, thereby slowing down the rate of oil pressure drop in the high-pressure oil circuit 4 and ensuring that the oil pressure in the high-pressure oil circuit 4 is within the required range. The two ends of the valve plate 402 are respectively connected to the clutch 403 and the switching valve 3. The valve plate 402 can make the lubricating oil flowing from the accumulator 401 or the switching valve 3 to the clutch 403 flow in one direction, thereby avoiding the oil pressure at the clutch 403 from being lost through the switching valve 3 or the accumulator 401. Furthermore, the clutch 403 is used to consume the oil pressure in the high-pressure oil circuit 4 to complete the clutch action, thereby realizing operations such as shifting or starting.

[0031] In an optional embodiment, the switching valve 3 includes a valve body 301 and a shell 302; a receiving chamber for accommodating the valve body 301 is provided in the shell 302, the valve body 301 is slidably connected to the receiving chamber, the output ends of the high-pressure oil circuit 4, the lubricating oil circuit 5 and the high-pressure oil pump 1 are respectively connected to the receiving chamber, and the valve body 301 slides to connect the high-pressure oil circuit 4 and the high-pressure oil pump 1, or to connect the high-pressure oil pump 1 and the lubricating oil circuit 5.

[0032] In the above embodiment, the shell 302 and the valve body 301 can both be made of metal, the shell 302 can be made of aluminum alloy, and the valve body 301 can be made of steel. The valve body 301 is cylindrical, and the accommodating cavity in the shell 302 is also cylindrical. The length of the accommodating cavity is greater than the length of the valve body 301, so that the valve body 301 can slide relative to the accommodating cavity. Furthermore, there is a small gap between the diameter of the valve body 301 and the inner diameter of the accommodating cavity, which is convenient for processing, so that the valve body 301 can be closely attached to the inner wall of the accommodating cavity to prevent the lubricating oil from overflowing through the gap between the valve body 301 and the accommodating cavity, and the shell 302 is provided with three An interface connected to the accommodating chamber, so that the high-pressure oil circuit 4, the output end of the high-pressure oil pump 1 and the lubricating oil circuit 5 are connected to the accommodating chamber through the interfaces respectively, and when the valve body 301 moves in the accommodating chamber, the valve body 301 can connect the high-pressure oil pump 1 with the high-pressure oil circuit 4. At this time, the valve body 301 blocks the interface of the lubricating oil circuit 5, so that the high-pressure oil pump 1 can supply oil to the high-pressure oil circuit 4. The valve body 301 can also connect the interface of the high-pressure oil pump 1 and the lubricating oil circuit 5 after moving, so that the high-pressure oil pump 1 can supply oil to the lubricating oil circuit 5. At this time, the valve body 301 closes the interface of the high-pressure oil circuit 4, thereby realizing the switching of the output path of the high-pressure oil pump 1.

[0033] In an optional embodiment, a first connecting hole 304, a second connecting hole 305 and a third connecting hole 306 are provided on the shell 302, and the first connecting hole 304, the second connecting hole 305 and the third connecting hole 306 are respectively connected to the accommodating chamber, the first connecting hole 304 is connected to the high-pressure oil circuit 4, the second connecting hole 305 is connected to the high-pressure oil pump 1, and the third connecting hole 306 is connected to the lubricating oil circuit 5; a connecting groove 307 is provided on the valve body 301, and the connecting groove 307 is arranged along the circumferential extension of the valve body 301. When the connecting groove 307 slides relative to the inner wall of the accommodating chamber, the connecting groove 307 can connect the first connecting hole 304 and the second connecting hole 305, or connect the second connecting hole 305 and the third connecting hole 306.

[0034] In the above embodiment, the first connection hole 304, the second connection hole 305 and the third connection hole 306 are arranged at intervals along the length direction of the housing 302, the second connection hole 305 is arranged between the first connection hole 304 and the third connection hole 306, the first connection hole 304, the second connection hole 305 and the third connection hole 306 are connected to the high-pressure oil circuit 4, the high-pressure oil pump 1 and the lubricating oil circuit 5 in sequence, and the connection method may include a pipeline and a channel in the gearbox, and the valve body 301 is provided with a connecting groove 307, and the connecting groove 307 is arranged along the valve body 301 The connecting groove 307 is extended and recessed in the circumferential direction, thereby increasing the flow space of the lubricating oil and increasing the flow rate of the lubricating oil, and the diameter of the connecting groove 307 is smaller than the diameter of the valve body 301, and the width of the connecting groove 307 is equal to the farthest distance between the first connecting hole 304 and the second connecting hole 305, or the farthest distance between the second connecting hole 305 and the third connecting hole 306, so that during the movement of the valve body 301, the connecting groove 307 can only connect the first connecting hole 304 and the second connecting hole 305, or connect the second connecting hole 305 and the third connecting hole 306.

[0035] In an optional embodiment, the switching valve 3 also includes an elastic member 303, both ends of which are respectively connected to the valve body 301 and the inner wall of the accommodating chamber, and the elastic member 303 has a tendency to move the valve body 301 in the direction of connection between the high-pressure oil pump 1 and the high-pressure oil circuit 4.

[0036] In the above embodiment, the elastic member 303 can be set as a spring, the axis of the elastic member 303 is arranged to coincide with the axis of the accommodating chamber, one end of the elastic member 303 abuts against the inner wall of the accommodating chamber, and the elastic member 303 can have a connecting groove 307 that connects the first connecting hole 304 and the second connecting hole 305, so that without applying external force, the switching valve 3 can ensure that the high-pressure oil pump 1 supplies oil to the high-pressure oil circuit 4.

[0037] Optionally, a driving member may be provided on the switching valve 3, and the driving member is connected to the valve body 301. The driving member can drive the valve body 301 to move in the direction of compressing the elastic member 303 so that the high-pressure oil pump 1 and the lubricating oil circuit 5 are connected, wherein the driving member can be set as a solenoid valve, and the solenoid valve set at one end of the elastic member 303 attracts the valve body 301 to compress the elastic member 303, so that the connecting groove 307 can connect the second connecting hole 305 and the third connecting hole 306, thereby realizing the switching of the high-pressure oil pump 1 to supply oil to the lubricating oil circuit 5 via the solenoid valve.

[0038] Some embodiments of the present invention also provide a working method of an oil supply device, comprising the following steps: an oil pressure detector detects the oil pressure in the high-pressure oil circuit 4 and transmits it to the controller. When the controller determines that the oil pressure in the high-pressure oil circuit 4 is at or below a first preset oil pressure range, the controller controls the switching valve 3 to switch to the high-pressure oil pump 1 to be connected to the high-pressure oil circuit 4, and the low-pressure oil pump 2 to be connected to the lubricating oil circuit 5, and the speed of the drive motor is increased by the controller; the oil pressure detector detects the oil pressure in the high-pressure oil circuit 4 and transmits it to the controller. When the controller determines that the oil pressure in the high-pressure oil circuit 4 is higher than the upper limit value of the first preset oil pressure range, the controller controls the switching valve 3 to switch to the high-pressure oil pump 1 to be connected to the lubricating oil circuit 5, and the low-pressure oil pump 2 to be connected to the lubricating oil circuit 5 at the same time, and the controller reduces the speed of the low-pressure oil pump 2 driving the motor; when the oil pressure in the high-pressure oil circuit 4 is lower than the lower limit value of the first preset oil pressure range, the switching valve 3 is controlled to switch to the high-pressure oil pump 1 to be connected to the high-pressure oil circuit 4, and the low-pressure oil pump 2 to be connected to the lubricating oil circuit 5 at the same time.

[0039] In an optional embodiment, the following steps are also included: when the oil pressure in the high-pressure oil circuit 4 is higher than the upper limit value of the first preset oil pressure range, the high-pressure oil circuit 4 is disconnected from the high-pressure oil pump 1, and when the high-pressure oil pump 1 is connected to the lubricating oil circuit 5, the speeds of the high-pressure oil pump 1 and the low-pressure oil pump 2 can be reduced while satisfying the flow rate in the lubricating oil circuit 5; and / or, when the oil pressure in the high-pressure oil circuit 4 is lower than the lower limit value of the first preset oil pressure range, the high-pressure oil circuit 4 is connected to the high-pressure oil pump 1, and the high-pressure oil pump 1 is disconnected from the lubricating oil circuit 5, at this time, the speed of the low-pressure oil pump 2 is increased so that the flow rate in the lubricating oil circuit 5 meets the preset value, and the speed of the high-pressure oil pump 1 drive motor can be increased until the oil pressure in the high-pressure oil circuit 4 is higher than the first preset pressure range.

[0040] Among them, the flow rate of the lubricating oil in the lubricating oil circuit 5 is 15L / min, that is, whether the high-pressure oil pump 1 and the low-pressure oil pump 2 supply oil to the lubricating oil circuit 5 at the same time, or the lubricating oil pump supplies oil alone, it is necessary to meet the requirement that the flow rate of the lubricating oil in the lubricating oil circuit 5 is 15L / min, and the upper and lower limits of the first preset oil pressure range of the high-pressure oil circuit 4 are 55bar to 45bar respectively.

[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An oil supply device, characterized in that: It includes a high-pressure oil pump, a low-pressure oil pump and a switching valve; The two ends of the high-pressure oil pump are respectively connected to the oil pool and the high-pressure oil circuit, the two ends of the low-pressure oil pump are respectively connected to the oil pool and the lubricating oil circuit, the switching valve is respectively connected to the high-pressure oil pump, the high-pressure oil circuit and the lubricating oil circuit, and the switching valve can control the high-pressure oil pump to be connected to the high-pressure oil circuit or the lubricating oil circuit.

2. The oil supply device according to claim 1, characterized in that: Also includes a drive motor and a controller; The driving motor is connected to the high-pressure oil pump and the low-pressure oil pump respectively, and the driving motor drives the high-pressure oil pump and the low-pressure oil pump to rotate synchronously; The controller is connected to the driving motor via an electrical signal, and the controller is used to control the rotation speed of the driving motor.

3. The oil supply device according to claim 2, characterized in that: The controller is connected to the switching valve by electrical signals, and the controller can control the switching of the switching valve.

4. The oil supply device according to claim 2, characterized in that: It also includes an oil pressure detector and a flow detector, the oil pressure detector is connected to the high-pressure oil circuit, the flow detector is connected to the lubricating oil circuit, the oil pressure detector and the flow detector are respectively connected to the controller electrical signal, the oil pressure detector is used to detect the oil pressure of the high-pressure oil circuit, and the flow detector is used to detect the flow of the lubricating oil circuit.

5. The oil supply device according to claim 1, characterized in that: The high-pressure oil circuit includes an accumulator, a valve plate and a clutch; Both ends of the valve plate are respectively communicated between the switching valve and the clutch, and one end of the accumulator is communicated between the switching valve and the valve plate.

6. The oil supply device according to claim 1, characterized in that: The switching valve comprises a valve body and a housing; The housing is provided with an accommodating chamber for accommodating the valve body, the valve body is slidably connected to the accommodating chamber, the high-pressure oil circuit, the lubricating oil circuit and the output end of the high-pressure oil pump are respectively connected to the accommodating chamber, and the valve body slides to connect the high-pressure oil circuit with the high-pressure oil pump, or to connect the high-pressure oil pump with the lubricating oil circuit.

7. The oil supply device according to claim 6, characterized in that: The housing is provided with a first connecting hole, a second connecting hole and a third connecting hole, the first connecting hole, the second connecting hole and the third connecting hole are respectively connected to the accommodating chamber, the first connecting hole is connected to the high-pressure oil circuit, the second connecting hole is connected to the high-pressure oil pump, and the third connecting hole is connected to the lubricating oil circuit; A connecting groove is provided on the valve body, and the connecting groove is arranged along the circumference of the valve body. When the connecting groove slides relative to the inner wall of the accommodating cavity, the connecting groove can connect the first connecting hole and the second connecting hole, or connect the second connecting hole and the third connecting hole.

8. The oil supply device according to claim 6, characterized in that: The switching valve further comprises an elastic member, both ends of which are respectively connected to the valve body and the inner wall of the accommodating chamber, and the elastic member has a tendency to move the valve body in a direction connecting the high-pressure oil pump and the high-pressure oil circuit.

9. A working method based on the oil supply device according to any one of claims 1 to 8, characterized in that: The following steps are involved: When the oil pressure in the high-pressure oil circuit is within a first preset oil pressure range, the control switch valve is switched to connect the high-pressure oil pump to the high-pressure oil circuit and the low-pressure oil pump to the lubricating oil circuit; When the oil pressure in the high-pressure oil circuit is higher than the upper limit value of the first preset oil pressure range, the control switching valve is switched to connect the high-pressure oil pump to the lubricating oil circuit, and the low-pressure oil pump is connected to the lubricating oil circuit at the same time; When the oil pressure in the high-pressure oil circuit is lower than the lower limit of the first preset oil pressure range, the control switching valve is switched to connect the high-pressure oil pump to the high-pressure oil circuit, and the low-pressure oil pump is connected to the lubricating oil circuit at the same time.

10. The working method according to claim 9, characterized in that: The following steps are also included: When the oil pressure in the high-pressure oil circuit is higher than the upper limit value of the first preset oil pressure range, the rotation speeds of the high-pressure oil pump and the low-pressure oil pump are reduced so that the flow rate in the lubricating oil circuit meets the preset value; And / or, when the oil pressure in the high-pressure oil circuit is lower than the lower limit of the first preset oil pressure range, the rotation speeds of the high-pressure oil pump and the low-pressure oil pump are increased so that the flow rate in the lubricating oil circuit meets the preset value.

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