Flow control oil supply system

Abstract

The utility model provides a flow control oil supply system which comprises a first filter and a flow distribution valve, an inlet of the first filter is connected with an oil tank, and an outlet of the first filter is respectively connected with a lubricating pump and an oil supplementing pump. An outlet of the lubricating pump is connected with a heat dissipation unit, and an outlet of the heat dissipation unit is connected with a lubricating connector. An outlet of the oil recharging pump is provided with an oil recharging control unit; the oil recharging control unit is connected with a closed system oil recharging interface; an inlet of the flow distribution valve is connected with the oil supplementing control unit, a first outlet of the flow distribution valve is connected with the heat dissipation unit, and a second outlet of the flow distribution valve is connected with an outlet of the first filter. According to the utility model, through the lubricating pump and the oil supplementing pump, the oil supply of the lubricating system and the oil supplementing system is realized, the use of a large-displacement pump is omitted, the occupied space is small, the cost is reduced, and the volumetric efficiency is improved; and the flow of each path of oil can be adjusted according to requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems for agricultural machinery, in particular to a flow control oil supply system. Background Art

[0002] At present, in agricultural machinery such as high-horsepower tractors with horsepower exceeding 400, the flow demand of hydraulic oil is large, so the hydraulic pump used has a large displacement, which not only occupies a large space of the whole machine, but also can only maintain a large displacement and pressure once turned on, resulting in high manufacturing and use costs of the whole machine, and low volumetric efficiency. At the same time, during the use of agricultural machinery, the flow demand of hydraulic oil always changes. When the flow demand of the hydraulic system decreases, the hydraulic pump can only maintain a large displacement output and cannot be adjusted, resulting in energy waste. Utility Model Content

[0003] The technical problem to be solved by the utility model is: how to adjust the output displacement according to the demand of the hydraulic system and reduce the cost of high-horsepower agricultural machinery.

[0004] The technical solution of the utility model to solve the above technical problems is as follows:

[0005] The utility model provides a flow control oil supply system, comprising a first filter and a flow distribution valve, wherein the inlet of the first filter is connected to an oil tank, and the outlet of the first filter is respectively connected to a lubrication pump and an oil replenishment pump; the outlet of the lubrication pump is connected to a heat dissipation unit, and the outlet of the heat dissipation unit is connected to a lubrication interface; the outlet of the oil replenishment pump is provided with an oil replenishment control unit, and the oil replenishment control unit is connected to a closed system oil replenishment interface; the inlet of the flow distribution valve is connected to the oil replenishment control unit, the first outlet of the flow distribution valve is connected to the heat dissipation unit, and the second outlet of the flow distribution valve is connected to the outlet of the first filter.

[0006] The beneficial effects of the utility model are:

[0007] With the utility model, the lubrication pump and the oil replenishment pump work together to realize the oil supply of the lubrication system and the oil replenishment system, eliminating the use of a large-displacement pump, occupying a small space, reducing costs, and improving volumetric efficiency; through the flow distribution valve, the flow direction of the oil output by the oil replenishment pump can be adjusted according to the different needs of lubrication and oil replenishment. When the lubrication demand is large, the oil can pass through the flow distribution valve to the lubrication interface. When the oil replenishment demand is large, the flow distribution valve is closed, and the oil can be fully supplied to the closed system oil replenishment interface; in addition, when the oil temperature is low and the viscosity is high, the oil output by the oil replenishment pump can also pass through the flow distribution valve to boost the oil supply for the lubrication pump and the oil replenishment pump, avoiding the difficulty of the pump group to absorb oil and causing empty suction, thereby protecting the pump group. In addition, when the hydraulic system demand is small, the lubrication pump or the oil replenishment pump can be turned off, so as to operate with low power consumption and avoid energy waste.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, a first one-way valve is provided on the oil path from the oil replenishment control unit to the flow distribution valve, and the first one-way valve can allow oil to flow from the oil replenishment control unit to the flow distribution valve in one direction.

[0010] The first one-way valve can prevent oil from flowing back from the flow distribution valve to the oil replenishment control unit, thereby ensuring the oil supply to the lubrication system; utilizing the resistance of the first one-way valve can facilitate the priority guarantee of the flow supply of oil replenishment in the closed system; when the oil replenishment control unit meets its own needs, excess oil enters the flow distribution valve through the first one-way valve, thereby facilitating flexible distribution of oil and improving oil utilization.

[0011] Furthermore, it also includes a boost pump, the inlet of the boost pump is connected to the outlet of the first filter, and the outlet of the boost pump is connected to the oil path from the first one-way valve to the flow distribution valve.

[0012] When the hydraulic oil flow demand is large, the flow of the flow distribution valve can be guaranteed by turning on the boost pump; the first one-way valve can prevent the hydraulic oil output by the boost pump from flowing to the oil replenishment control unit, thereby ensuring the oil supply to the flow distribution valve.

[0013] Furthermore, the outlet of the boost pump is also connected to the oil tank through a branch line, and a second one-way valve and a first throttle hole are sequentially arranged on the branch line from the outlet of the boost pump to the oil tank.

[0014] The second one-way valve and the first throttle hole can increase the branch resistance, and the excess pressure and flow output by the booster pump can flow back to the oil tank through the second one-way valve and the first throttle hole, so as to protect the hydraulic system.

[0015] Furthermore, the oil replenishment control unit includes a second filter, a first control valve and a second control valve, the outlet of the oil replenishment pump is connected to the inlet of the second filter, the outlet of the second filter is connected to the closed system oil replenishment interface, the first control valve and the second control valve through branches, the outlet of the first control valve is connected to one end of the valve core of the flow distribution valve, the outlet of the second control valve is connected to the other end of the valve core of the flow distribution valve, and the oil return port of the first control valve and the oil return port of the second control valve are respectively connected to the oil tank.

[0016] The second filter can improve the cleanliness of the oil and ensure the cleanliness of the oil supplied to the closed system; the opening and closing of the first control valve and the second control valve can make use of the output oil pressure of the oil replenishment pump to control the movement of the valve core of the flow distribution valve, thereby controlling the working position of the flow distribution valve, which is easy to operate.

[0017] Furthermore, the outlet of the second filter is also connected to the outlet of the first filter through a branch, and a relief valve is also provided on the branch from the outlet of the second filter to the outlet of the first filter, and the pressure relief port of the relief valve is connected to the oil tank.

[0018] When the first control valve and the second control valve are not in operation, it is convenient to guide the excess oil to the outlet of the first filter so as to allow the pump group to circulate and absorb oil, thereby reducing the oil absorption resistance of the pump group and improving the utilization rate of the oil.

[0019] Furthermore, the outlet of the second filter is also connected to a brake oil interface via a branch.

[0020] The brake oil interface can be used to connect the brake system and supply oil to the brake system, thereby increasing the function and application scope of the oil supply system.

[0021] Furthermore, the heat dissipation unit includes a temperature control valve and a radiator connected in parallel, the outlet of the lubrication pump and the first outlet of the flow distribution valve are respectively connected to the inlet of the temperature control valve, and the outlet of the temperature control valve is connected to the lubrication interface.

[0022] When the oil temperature is normal, the temperature control valve opens, and the oil can be directly supplied to the lubrication interface through the temperature control valve, with fast oil supply and low resistance. When the oil temperature is too high, the temperature control valve closes, and the oil enters the radiator for cooling before being supplied to the lubrication interface, ensuring oil cooling.

[0023] Furthermore, when the oil replenishment control unit includes a second filter, a first control valve and a second control valve: a temperature detector is provided in the temperature control valve, the temperature detector signal is connected to the controller, and the controller is connected to the first control valve and the second control valve through signals respectively.

[0024] The signal of the temperature detector is transmitted to the controller, and the controller can control the opening and closing of the first control valve and the second control valve, so as to indirectly control the working position of the flow distribution valve through the controller when the oil temperature is too high or too low, cool down the oil temperature in time when it is too high, and increase the pressure and supply oil to the pump group in time when the oil temperature is low, thereby improving the response speed and reliability of the system.

[0025] Furthermore, the outlet of the heat dissipation unit is also connected to the outlet of the first filter through a branch, and a third one-way valve is also provided on the branch from the outlet of the heat dissipation unit to the outlet of the first filter.

[0026] When the demand for the lubrication system is relatively small, it is convenient to allow excess flow to flow to the outlet of the first filter to boost the oil supply for the pump group, thereby improving the oil utilization rate; through the third one-way valve, it is convenient to prevent high-temperature oil from flowing to the lubrication interface. At the same time, the third one-way valve increases the branch resistance, so that the oil of the heat dissipation unit is preferentially supplied to the lubrication interface, thereby ensuring the oil supply to the lubrication interface.

[0027] Furthermore, the outlet of the oil replenishment pump is also connected to the oil tank through a branch line, and a fourth one-way valve and a second throttle hole are sequentially provided on the branch line from the outlet of the oil replenishment pump to the oil tank.

[0028] The fourth one-way valve and the second throttle hole can increase the branch resistance, and the excess pressure and flow output by the oil replenishment pump can flow back to the oil tank through the fourth one-way valve and the second throttle hole, so as to protect the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the utility model.

[0030] In the accompanying drawings, the technical features represented by the reference numerals are as follows:

[0031] 1-lubrication pump; 2-oil replenishment pump; 3-first filter; 4-oil tank; 5-lubrication interface; 6-closed system oil replenishment interface; 7-flow distribution valve; 8-first one-way valve; 9-boosting pump; 10-second one-way valve; 11-first throttle hole; 12-second filter; 13-first control valve; 14-second control valve; 15-unloading valve; 16-temperature control valve; 17-radiator; 18-third one-way valve; 19-fourth one-way valve; 20-second throttle hole; 21-brake oil interface. DETAILED DESCRIPTION

[0032] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0033] This utility model refers to Figure 1 .

[0034] The utility model provides a flow control oil supply system, comprising a first filter 3 and a flow distribution valve 7, wherein the inlet of the first filter 3 is connected to an oil tank 4, and the outlet of the first filter 3 is respectively connected to a lubrication pump 1 and an oil replenishment pump 2; the outlet of the lubrication pump 1 is connected to a heat dissipation unit, and the outlet of the heat dissipation unit is connected to a lubrication interface 5; the outlet of the oil replenishment pump 2 is provided with an oil replenishment control unit, and the oil replenishment control unit is connected to a closed system oil replenishment interface 6; the inlet of the flow distribution valve 7 is connected to the oil replenishment control unit, the first outlet of the flow distribution valve 7 is connected to the heat dissipation unit, and the second outlet of the flow distribution valve 7 is connected to the outlet of the first filter 3.

[0035] principle:

[0036] In the installed state, the lubrication interface 5 can be used to connect to the lubrication system to supply oil to the lubrication system; the closed system oil replenishment interface 6 can be used to connect to a closed system such as a hydraulic motor to replenish oil to the closed system.

[0037] In the working state, the lubrication pump 1 and the oil replenishment pump 2 respectively absorb oil from the oil tank 4 through the first filter 3. The hydraulic oil at the outlet of the lubrication pump 1 passes through the heat dissipation unit and then goes to the gearbox and other lubrication systems for lubrication. The hydraulic oil at the outlet of the oil replenishment pump 2 enters the oil replenishment control unit. In the oil replenishment control unit, one path goes to the closed system oil replenishment interface 6 for oil replenishment, and the other path enters the flow distribution valve 7. The flow distribution valve 7 has three positions: middle closed, first outlet working, and second outlet working. When the closed system has a large demand for oil replenishment, the flow distribution valve 7 can be switched to the middle closed position, and all the oil in the oil replenishment control unit is supplied to the closed system for oil replenishment; when the lubrication demand is large, the flow distribution valve 7 can be switched to the first outlet working position, and the oil in the oil replenishment control unit can pass through the flow distribution valve 7 into the heat dissipation unit, and then go to the lubrication system for lubrication; when the oil temperature is low and the viscosity is high, the flow distribution valve 7 can be switched to the second outlet working position, and the oil in the oil replenishment control unit can pass through the flow distribution valve 7 to flow to the outlet of the first filter 3, thereby pressurizing the lubrication pump 1 and the oil replenishment pump 2 to avoid oil suction difficulties caused by the pump group, thereby playing a protective role.

[0038] In summary, the utility model is adopted, through the joint work of the lubrication pump 1 and the oil replenishment pump 2, the oil supply of the lubrication system and the oil replenishment system is realized, the use of a large displacement pump is omitted, the space is small, the cost is reduced, and the volumetric efficiency is improved; through the flow distribution valve 7, the flow direction of the oil output by the oil replenishment pump 2 can be adjusted according to the different needs of lubrication and oil replenishment. When the lubrication demand is large, the oil can pass through the flow distribution valve 7 to the lubrication interface 5. When the oil replenishment demand is large, the flow distribution valve 7 is closed, and the oil can be fully supplied to the closed system oil replenishment interface 6; in addition, when the oil temperature is low and the viscosity is high, the oil output by the oil replenishment pump 2 can also pass through the flow distribution valve 7 to boost the oil supply for the lubrication pump 1 and the oil replenishment pump 2, avoiding the difficulty of the pump group to absorb oil and cause empty suction, thereby protecting the pump group. In addition, when the demand for the hydraulic system is small, the lubrication pump 1 or the oil replenishment pump 2 can be turned off, so as to operate with low power consumption and avoid energy waste.

[0039] Furthermore, a first one-way valve 8 is provided on the oil path from the oil replenishment control unit to the flow distribution valve 7 , and the first one-way valve 8 can allow oil to flow from the oil replenishment control unit to the flow distribution valve 7 in one direction.

[0040] The first one-way valve 8 can prevent the oil from flowing back from the flow distribution valve 7 to the oil replenishment control unit, thereby ensuring the oil supply of the lubrication system; utilizing the resistance of the first one-way valve 8 can facilitate the priority guarantee of the flow supply of oil replenishment in the closed system; when the oil replenishment control unit meets its own needs, the excess oil enters the flow distribution valve 7 through the first one-way valve 8, thereby facilitating the flexible distribution of oil and improving the utilization rate of oil.

[0041] Furthermore, it also includes a boost pump 9 , the inlet of the boost pump 9 is connected to the outlet of the first filter 3 , and the outlet of the boost pump 9 is connected to the oil path from the first one-way valve 8 to the flow distribution valve 7 .

[0042] When the hydraulic oil flow demand is large, the flow of the flow distribution valve 7 can be guaranteed by turning on the boost pump 9; the first one-way valve 8 can prevent the hydraulic oil output by the boost pump 9 from flowing to the oil replenishment control unit, thereby ensuring the oil supply of the flow distribution valve 7.

[0043] Furthermore, the outlet of the boost pump 9 is also connected to the oil tank 4 through a branch line, and a second one-way valve 10 and a first throttle hole 11 are sequentially provided on the branch line from the outlet of the boost pump 9 to the oil tank 4 .

[0044] The second one-way valve 10 and the first throttle hole 11 can increase the branch resistance, and the excess pressure and flow output by the boost pump 9 can flow back to the oil tank 4 through the second one-way valve 10 and the first throttle hole 11, so as to protect the hydraulic system.

[0045] Furthermore, the oil replenishment control unit includes a second filter 12, a first control valve 13 and a second control valve 14, the outlet of the oil replenishment pump 2 is connected to the inlet of the second filter 12, the outlet of the second filter 12 is connected to the closed system oil replenishment interface 6, the first control valve 13 and the second control valve 14 through branches, the outlet of the first control valve 13 is connected to one end of the valve core of the flow distribution valve 7, the outlet of the second control valve 14 is connected to the other end of the valve core of the flow distribution valve 7, and the oil return port of the first control valve 13 and the oil return port of the second control valve 14 are respectively connected to the oil tank 4.

[0046] Note: The inlet of the flow distribution valve 7 can be connected to any position of the replenishment control unit without affecting the flow distribution adjustment function. Preferably, the inlet of the flow distribution valve 7 is connected to the oil circuit from the outlet of the replenishment pump 2 to the second filter 12; this is convenient for reducing the load of the second filter 12. For the first control valve 13 and the second control valve 14, the working position of the flow distribution valve 7 is taken as an example in the attached figure. When the first control valve 13 and the second control valve 14 are both opened, the pressure at both ends of the valve core of the flow distribution valve 7 is the same, and the flow distribution valve 7 is in the middle position and closed; when only the first control valve 13 is opened, the valve core of the flow distribution valve 7 moves to the right and switches to the first outlet for operation; when only the second control valve 14 is opened, the valve core of the flow distribution valve 7 moves to the left and switches to the second outlet for operation.

[0047] The second filter 12 can be used to improve the cleanliness of the oil and ensure the cleanliness of the oil supplied to the closed system; the opening and closing of the first control valve 13 and the second control valve 14 can be used to utilize the output oil pressure of the oil replenishment pump 2 to control the valve core movement of the flow distribution valve 7, thereby controlling the working position of the flow distribution valve 7, which is easy to operate.

[0048] Furthermore, the outlet of the second filter 12 is also connected to the outlet of the first filter 3 through a branch, and a relief valve 15 is also provided on the branch from the outlet of the second filter 12 to the outlet of the first filter 3 , and the pressure relief port of the relief valve 15 is connected to the oil tank 4 .

[0049] When the first control valve 13 and the second control valve 14 are not in operation, it is convenient to guide the excess oil to the outlet of the first filter 3 for the pump group to circulate and absorb oil, thereby reducing the oil absorption resistance of the pump group and improving the utilization rate of the oil.

[0050] Furthermore, the outlet of the second filter 12 is also connected to the brake oil interface 21 through a branch line.

[0051] The brake oil interface 21 can be used to connect to the brake system and supply oil to the brake system, thereby increasing the function and application scope of the oil supply system.

[0052] Furthermore, the heat dissipation unit includes a temperature control valve 16 and a radiator 17 connected in parallel, the outlet of the lubrication pump 1 and the first outlet of the flow distribution valve 7 are respectively connected to the inlet of the temperature control valve 16, and the outlet of the temperature control valve 16 is connected to the lubrication interface 5.

[0053] When the oil temperature is normal, the temperature control valve 16 is opened, and the oil can be directly supplied to the lubrication interface 5 through the temperature control valve 16, with fast oil supply and small resistance; when the oil temperature is too high, the temperature control valve 16 is closed, and the oil enters the radiator 17 for cooling before being supplied to the lubrication interface 5, ensuring the cooling of the oil.

[0054] Furthermore, when the oil replenishment control unit includes a second filter 12, a first control valve 13 and a second control valve 14: a temperature detector is provided in the temperature control valve 16, and the temperature detector signal is connected to a controller, and the controller is connected to the first control valve 13 and the second control valve 14 through signals respectively.

[0055] Note: When the oil temperature is too high, the controller controls the first control valve 13 to open and the second control valve 14 to close, and drives the flow distribution valve 7 to switch to the first outlet to work, so that the oil goes to the radiator 17 for cooling; when the oil temperature is too low and the viscosity increases, the controller controls the first control valve 13 to close and the second control valve 14 to open, and drives the flow distribution valve 7 to switch to the second outlet to work, so that the oil goes to the outlet of the first filter 3 to boost the oil supply for the lubrication pump 1, the oil replenishment pump 2 and the boost pump 9.

[0056] The signal of the temperature detector is transmitted to the controller, and the controller can control the opening and closing of the first control valve 13 and the second control valve 14, so as to indirectly control the working position of the flow distribution valve 7 through the controller when the oil temperature is too high or too low, and timely cool down the oil temperature when it is too high, and timely increase the pressure and supply oil to the pump group when the oil temperature is low, thereby improving the response speed and reliability of the system.

[0057] Furthermore, the outlet of the heat dissipation unit is also connected to the outlet of the first filter 3 through a branch, and a third one-way valve 18 is also provided on the branch from the outlet of the heat dissipation unit to the outlet of the first filter 3 .

[0058] When the demand for the lubrication system is relatively small, it is convenient to allow excess flow to flow to the outlet of the first filter 3, to boost the oil supply for the pump group, and to improve the oil utilization rate; through the third one-way valve 18, it is convenient to prevent high-temperature oil from flowing to the lubrication interface 5. At the same time, the third one-way valve 18 increases the branch resistance, so that the oil of the heat dissipation unit is preferentially supplied to the lubrication interface 5, thereby ensuring the oil supply to the lubrication interface 5.

[0059] Furthermore, the outlet of the oil replenishment pump 2 is also connected to the oil tank 4 through a branch line, and a fourth one-way valve 19 and a second throttle hole 20 are sequentially provided on the branch line from the outlet of the oil replenishment pump 2 to the oil tank 4 .

[0060] The fourth one-way valve 19 and the second throttle hole 20 can increase the branch resistance, and the excess pressure and flow output by the oil replenishment pump 2 can flow back to the oil tank 4 through the fourth one-way valve 19 and the second throttle hole 20, so as to protect the hydraulic system.

[0061] In the description of the present invention, it should be understood that if there are descriptive terms indicating orientation, direction or positional relationship, such as: "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of understanding the present invention and simplifying the description, and does not indicate or imply that the referred part, element or whole must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0062] In addition, if there are order description terms, such as "first", "second", etc., their purpose in this specification is to facilitate understanding or simplify description. For example, in order to distinguish multiple technical features of the same type or function, but they have to be mentioned separately, this specification may use prefix or suffix order description terms to distinguish them. Therefore, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0063] In the present invention, if there are descriptive terms with subsidiary or connecting meanings, for example, a first feature is "on" or "below" a second feature, unless otherwise clearly specified and limited, it should not be understood in a restrictive manner. For example, "on" or "below" may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above descriptive terms in the present invention can be understood according to the specific circumstances, the context, the coherence of the context, etc.

[0064] Furthermore, the first feature being “above”, “above”, and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being “below”, “below”, and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments, examples and features of the different embodiments and examples described in this specification without contradiction, and these combinations or combinations shall all fall within the scope summarized by the utility model.

[0066] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. A person skilled in the art can change, modify, replace and modify the above embodiments within the scope of information available from public channels and in combination with the technical inspiration provided by the present application documents.

Claims

1. A flow control oil supply system, characterized in that: The invention comprises a first filter (3) and a flow distribution valve (7); the inlet of the first filter (3) is connected to an oil tank (4); the outlet of the first filter (3) is respectively connected to a lubrication pump (1) and an oil replenishment pump (2); the outlet of the lubrication pump (1) is connected to a heat dissipation unit; the outlet of the heat dissipation unit is connected to a lubrication interface (5); the outlet of the oil replenishment pump (2) is provided with an oil replenishment control unit; the oil replenishment control unit is connected to a closed system oil replenishment interface (6); the inlet of the flow distribution valve (7) is connected to the oil replenishment control unit; the first outlet of the flow distribution valve (7) is connected to the heat dissipation unit; and the second outlet of the flow distribution valve (7) is connected to the outlet of the first filter (3).

2. The flow control oil supply system according to claim 1, characterized in that: A first one-way valve (8) is also provided on the oil path from the oil replenishment control unit to the flow distribution valve (7). The first one-way valve (8) can allow oil to flow from the oil replenishment control unit to the flow distribution valve (7) in one direction.

3. The flow control oil supply system according to claim 2, characterized in that: It also includes a boost pump (9), the inlet of the boost pump (9) is connected to the outlet of the first filter (3), and the outlet of the boost pump (9) is connected to the oil path from the first one-way valve (8) to the flow distribution valve (7).

4. The flow control oil supply system according to claim 3, characterized in that: The outlet of the booster pump (9) is also connected to the oil tank (4) via a branch line, and a second one-way valve (10) and a first throttle hole (11) are sequentially arranged on the branch line from the outlet of the booster pump (9) to the oil tank (4).

5. The flow control oil supply system according to claim 1, characterized in that: The oil replenishment control unit comprises a second filter (12), a first control valve (13) and a second control valve (14); the outlet of the oil replenishment pump (2) is connected to the inlet of the second filter (12); the outlet of the second filter (12) is connected to the closed system oil replenishment interface (6), the first control valve (13) and the second control valve (14) through branches respectively; the outlet of the first control valve (13) is connected to one end of the valve core of the flow distribution valve (7); the outlet of the second control valve (14) is connected to the other end of the valve core of the flow distribution valve (7); the oil return port of the first control valve (13) and the oil return port of the second control valve (14) are respectively connected to the oil tank (4).

6. The flow control oil supply system according to claim 5, characterized in that: The outlet of the second filter (12) is also connected to the outlet of the first filter (3) via a branch, and a relief valve (15) is also provided on the branch from the outlet of the second filter (12) to the outlet of the first filter (3), and the pressure relief port of the relief valve (15) is connected to the oil tank (4); the outlet of the second filter (12) is also connected to a brake oil interface (21) via a branch.

7. The flow control oil supply system according to any one of claims 1 to 6, characterized in that: The heat dissipation unit comprises a temperature control valve (16) and a radiator (17) connected in parallel with each other, the outlet of the lubrication pump (1) and the first outlet of the flow distribution valve (7) are respectively connected to the inlet of the temperature control valve (16), and the outlet of the temperature control valve (16) is connected to the lubrication interface (5).

8. The flow control oil supply system according to claim 7, characterized in that: When the oil replenishment control unit includes a second filter (12), a first control valve (13) and a second control valve (14): a temperature detector is provided in the temperature control valve (16), the temperature detector signal is connected to a controller, and the controller is connected to the first control valve (13) and the second control valve (14) via signals.

9. The flow control oil supply system according to claim 1, characterized in that: The outlet of the heat dissipation unit is also connected to the outlet of the first filter (3) via a branch line, and a third one-way valve (18) is also provided on the branch line from the outlet of the heat dissipation unit to the outlet of the first filter (3).

10. The flow control oil supply system according to claim 1, characterized in that: The outlet of the oil replenishment pump (2) is also connected to the oil tank (4) via a branch line, and a fourth one-way valve (19) and a second throttle hole (20) are sequentially provided on the branch line from the outlet of the oil replenishment pump (2) to the oil tank (4).

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