Hydraulic control system for single-stage speed reducer of electric car

Abstract

The invention relates to the technical field of electric vehicle hydraulic control, and particularly discloses an electric vehicle single-stage speed reducer hydraulic control system which comprises an oil supply assembly, a first control assembly, a second control assembly and a third control assembly. When the double-acting hydraulic cylinder acts on the clutch of the single-stage speed reducer of the electric vehicle and the clutch is in a joint state, oil can be supplied to one cavity of the double-acting hydraulic cylinder alternately through the oil supply assembly and the first energy accumulator in the first control oil way; oil can be supplied to the other cavity of the double-acting hydraulic cylinder through the oil supply assembly and a second energy accumulator of the second control oil way, so that on one hand, continuous high-load operation of the oil supply assembly is avoided, and on the other hand, the requirement for lubricating a gear mechanism of the single-stage speed reducer of the electric vehicle through the third control assembly can be met; and meanwhile, accurate control over acceleration, deceleration and stopping of the electric car can be achieved through the double-acting hydraulic cylinder, and therefore energy consumption is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of tram hydraulic control, and in particular to a hydraulic control system for a tram single-stage reducer. Background Art

[0002] At present, cars can use single-stage reducers to reduce speed and increase torque, improve driving stability and safety, and extend the life of the gearbox. As one of the important components of a single-stage reducer, the performance of the hydraulic control system will directly affect the efficiency and reliability of the entire reducer working process. The hydraulic control system uses hydraulic oil as the working medium and accurately adjusts the pressure, flow rate and flow direction of the oil through the control valve, thereby achieving control of the size, direction and speed of the reducer output power.

[0003] However, the hydraulic control system in the prior art still has some shortcomings. For example, some hydraulic control systems have problems such as poor oil flow and inaccurate pressure control in their design, which leads to a sense of frustration when the clutch is engaged, affecting the driving experience; at the same time, the complex oil circuit layout and control logic also increase the system's failure rate and maintenance difficulty. Summary of the invention

[0004] The purpose of the present invention is to provide a hydraulic control system for a single-stage reducer of a tram, so as to solve the problems of poor oil flow, inaccurate pressure control and the like existing in the hydraulic control system of the prior art.

[0005] In order to solve the above problems, the present invention provides a hydraulic control system for a tram single-stage reducer, which includes: an oil supply component; a first control component, including a first control oil circuit, a second control oil circuit and a double-acting hydraulic cylinder, the inlet of the first control oil circuit and the inlet of the second control oil circuit are both connected and disconnected with the oil outlet of the oil supply component, and the two cavities of the double-acting hydraulic cylinder are respectively connected with the outlet of the first control oil circuit and the outlet of the second control oil circuit, the first control oil circuit has a first accumulator, and the second control oil circuit has a second accumulator, the first accumulator can alternately supply oil to one cavity of the double-acting hydraulic cylinder with the oil supply component, the second accumulator can alternately supply oil to the other cavity of the double-acting hydraulic cylinder with the oil supply component, and the double-acting hydraulic cylinder can be connected to the clutch of the tram single-stage reducer; the second control component can be connected and disconnected with the oil outlet of the oil supply component, and can supply oil to the friction element of the tram single-stage reducer; the third control component can be connected and disconnected with the oil outlet of the oil supply component, and can supply oil to the gear mechanism of the tram single-stage reducer.

[0006] As a preferred technical solution for the hydraulic control system of a single-stage reducer of a tram, the first control oil circuit includes a first delivery pipeline and a first control valve and a first pressure regulating valve arranged on the first delivery pipeline. The inlet of the first control valve is connected to the oil outlet of the oil supply assembly, the inlet of the first accumulator and the first pressure regulating valve are both connected to the outlet of the first control valve, and a cavity of a double-acting hydraulic cylinder and the oil inlet of the oil supply assembly are both connected to the outlet of the first pressure regulating valve.

[0007] As a preferred technical solution for the hydraulic control system of a tram single-stage reducer, the first control oil circuit includes a first one-way valve, which is arranged on a pipeline connecting the outlet of the first pressure regulating valve and the oil inlet of the oil supply assembly.

[0008] As a preferred technical solution for the hydraulic control system of a tram single-stage reducer, the first control oil circuit includes a first pressure sensor arranged on a first delivery pipeline, and the first pressure sensor is located between the first pressure regulating valve and the double-acting hydraulic cylinder.

[0009] As a preferred technical solution for the hydraulic control system of a tram single-stage reducer, the first control oil circuit also includes a second pressure sensor arranged on the first delivery pipeline, and the second pressure sensor is located between the first accumulator and the inlet of the first pressure regulating valve.

[0010] As a preferred technical solution for the hydraulic control system of a single-stage reducer of an electric vehicle, the first control oil circuit has a first working state and a second working state. In the first working state, the pressure value in the first control oil circuit is lower than the pressure value preset by the second pressure sensor, and the oil supply component supplies oil to the first accumulator; in the second working state, the pressure value in the first control oil circuit is higher than the pressure value preset by the first pressure sensor, and the oil supply component stops supplying oil to the first accumulator.

[0011] As a preferred technical solution for the hydraulic control system of a single-stage reducer of a tram, the second control component includes a second delivery pipeline and a second control valve arranged on the second delivery pipeline. The second control valve can control the on-off of the second delivery pipeline. The inlet of the second delivery pipeline is connected to the oil outlet of the oil supply component, and the outlet of the second delivery pipeline can supply oil to the friction element of the single-stage reducer of the tram.

[0012] As a preferred technical solution for the hydraulic control system of a single-stage reducer for electric vehicles, the third control component includes a third delivery pipeline and a third control valve arranged on the third delivery pipeline. The third control valve can control the on-off of the third delivery pipeline. The inlet of the third delivery pipeline is connected to the oil outlet of the oil supply component, and the outlet of the third delivery pipeline can supply oil to the gear mechanism of the single-stage reducer for electric vehicles.

[0013] As the preferred technical solution for the hydraulic control system of a single-stage reducer of an electric vehicle, the oil supply component includes an oil supply pump and an oil storage tank. The outlet of the oil storage tank is connected to the inlet of the oil supply pump. The inlet of the first control oil circuit, the inlet of the second control oil circuit, the second control component, and the third control component are all connected to the outlet of the oil supply pump in a disconnectable manner.

[0014] As a preferred technical solution for the hydraulic control system of a single-stage reducer for a tram, the hydraulic control system for a single-stage reducer for a tram also includes a pressure regulating component, the pressure regulating component includes a pressure regulating pipeline and a second one-way valve and a relief valve arranged on the pressure regulating pipeline, the inlet of the pressure regulating pipeline is connected to the oil storage tank, the outlet of the pressure regulating pipeline is connected to the outlet of the oil supply pump, the second one-way valve is located between the oil storage tank and the relief valve, and the pressure values ​​in the first control oil circuit, the second control oil circuit, the second control component, and the third control component are lower than the set pressure value of the relief valve.

[0015] The beneficial effects of the present invention are:

[0016] The present invention provides a hydraulic control system for a tram single-stage reducer, which includes an oil supply component, a first control component, a second control component and a third control component. Among them, the first control component includes a first control oil circuit, a second control oil circuit and a double-acting hydraulic cylinder. The hydraulic control system for a tram single-stage reducer of the present invention is adopted. Since the first control oil circuit has a first accumulator and the second control oil circuit has a second accumulator, when the double-acting hydraulic cylinder acts on the clutch of the tram single-stage reducer to make the clutch in an engaged state, oil can be alternately supplied to one cavity of the double-acting hydraulic cylinder through the oil supply component and the first accumulator in the first control oil circuit. Similarly, oil can also be supplied to another cavity of the double-acting hydraulic cylinder through the oil supply component and the second accumulator in the second control oil circuit. Such an arrangement avoids continuous high-load operation of the oil supply component on the one hand, and can also meet the lubrication requirements of the gear mechanism of the tram single-stage reducer through the third control component on the other hand; at the same time, the use of the double-acting hydraulic cylinder can realize precise control of acceleration, deceleration and stopping of the tram, thereby effectively reducing energy consumption. In addition, a second control component is provided to supply oil to the friction element of the electric vehicle single-stage reducer, so that the operation of the electric vehicle single-stage reducer is smoother. The electric vehicle single-stage reducer hydraulic control system of the present invention effectively solves the problems of poor oil flow and inaccurate pressure control in the hydraulic control system of the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the hydraulic control system of a single-stage reducer of a tram in an embodiment of the present invention.

[0018] In the figure:

[0019] 1. Oil supply assembly; 11. Oil supply pump; 12. Oil storage tank;

[0020] 2. First control assembly; 21. First control oil circuit; 211. First accumulator; 212. First delivery pipeline; 213. First control valve; 214. First pressure regulating valve; 215. First check valve; 216. First pressure sensor; 217. Second pressure sensor; 22. Second control oil circuit; 221. Second accumulator; 23. Double-acting hydraulic cylinder;

[0021] 3. Second control assembly; 31. Second delivery pipeline; 32. Second control valve;

[0022] 4. third control assembly; 41. third delivery pipeline; 42. third control valve;

[0023] 5. Pressure regulating assembly; 51. Pressure regulating pipeline; 52. Second one-way valve; 53. Overflow valve;

[0024] 6. Controller. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0027] 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.

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] like Figure 1 As shown, this embodiment provides a hydraulic control system for a tram single-stage reducer, which includes an oil supply component 1, a first control component 2, a second control component 3 and a third control component 4. Among them, the first control component 2 includes a first control oil circuit 21, a second control oil circuit 22 and a double-acting hydraulic cylinder 23, the first control oil circuit 21 has a first accumulator 211, the second control oil circuit 22 has a second accumulator 221, the inlet of the first control oil circuit 21 and the inlet of the second control oil circuit 22 are both connected to the oil outlet of the oil supply component 1 in a disconnectable manner, and the two cavities of the double-acting hydraulic cylinder 23 are respectively connected to the outlet of the first control oil circuit 21 and the outlet of the second control oil circuit 22.

[0030] The hydraulic control system of the electric vehicle single-stage reducer of the present invention is adopted. Since the first control oil circuit 21 has a first accumulator 211 and the second control oil circuit 22 has a second accumulator 221, when the double-acting hydraulic cylinder 23 acts on the clutch of the electric vehicle single-stage reducer to make the clutch in an engaged state, oil can be alternately supplied to one cavity of the double-acting hydraulic cylinder 23 through the oil supply component 1 and the first accumulator 211 in the first control oil circuit 21. Similarly, oil can also be supplied to another cavity of the double-acting hydraulic cylinder 23 through the oil supply component 1 and the second accumulator 221 in the second control oil circuit 22. Such a configuration avoids continuous high-load operation of the oil supply component 1 on the one hand, and can also meet the lubrication requirements of the gear mechanism of the electric vehicle single-stage reducer through the third control component 4 on the other hand; at the same time, the use of the double-acting hydraulic cylinder 23 can realize precise control of acceleration, deceleration and stopping of the electric vehicle, thereby effectively reducing energy consumption. In addition, the second control component 3 is provided to supply oil to the friction element of the electric vehicle single-stage reducer, so that the operation of the electric vehicle single-stage reducer is smoother. The electric vehicle single-stage reducer hydraulic control system of the present invention effectively solves the problems of poor oil flow, inaccurate pressure control, etc. in the hydraulic control system of the prior art.

[0031] The double-acting hydraulic cylinder 23 can be connected to the clutch of the electric vehicle single-stage reducer to control the clutch of the electric vehicle single-stage reducer to engage or disengage.

[0032] In some embodiments, the first control oil circuit 21 includes a first delivery pipeline 212 and a first control valve 213 and a first pressure regulating valve 214 arranged on the first delivery pipeline 212. The inlet of the first control valve 213 is connected to the oil outlet of the oil supply assembly 1. In this way, the first control valve 213 can control the on-off between the first delivery pipeline 212 and the oil supply assembly 1; at the same time, the inlet of the first accumulator 211 and the first pressure regulating valve 214 are connected to the outlet of the first control valve 213, and a cavity of the double-acting hydraulic cylinder 23 and the oil inlet of the oil supply assembly 1 are connected to the outlet of the first pressure regulating valve 214. In this way, the purpose of alternately supplying oil to a cavity of the double-acting hydraulic cylinder 23 by the first accumulator 211 and the oil supply assembly 1 can be achieved. The first pressure regulating valve 214 can adjust the pressure value in the first delivery pipeline 212.

[0033] Optionally, the first accumulator 211 can also stabilize the pressure in the first delivery pipeline 212 .

[0034] Specifically, the first control oil circuit 21 includes a first one-way valve 215. The first one-way valve 215 is arranged on a pipeline connecting the outlet of the first pressure regulating valve 214 and the oil inlet of the oil supply assembly 1. In this way, the hydraulic oil flowing out from the outlet of the first pressure regulating valve 214 to the oil inlet of the oil supply assembly 1 will not flow back into the first pressure regulating valve 214, thereby ensuring the stability and reliability of the electric vehicle single-stage reducer hydraulic control system during operation.

[0035] In this embodiment, the first control oil circuit 21 includes a first pressure sensor 216 disposed on the first delivery pipeline 212. The first pressure sensor 216 is located between the first pressure regulating valve 214 and the double-acting hydraulic cylinder 23, so that the first pressure sensor 216 can detect the pressure value entering the double-acting hydraulic cylinder 23 in real time.

[0036] Furthermore, the first control oil circuit 21 further includes a second pressure sensor 217 disposed on the first delivery pipeline 212. The second pressure sensor 217 is located between the first accumulator 211 and the inlet of the first pressure regulating valve 214. In this way, the second pressure sensor 217 can detect the pressure value coming out of the first accumulator 211 in real time.

[0037] Specifically, the first control oil circuit 21 has a first working state and a second working state. When in the first working state, the pressure value in the first control oil circuit 21 is lower than the pressure value preset by the second pressure sensor 217, so that the oil supply component 1 supplies oil to the first accumulator 211 to ensure that the first accumulator 211 can subsequently supply oil to the double-acting hydraulic cylinder 23; when in the second working state, the pressure value in the first control oil circuit 21 is higher than the pressure value preset by the first pressure sensor 216, and the oil supply component 1 stops supplying oil to the first accumulator 211.

[0038] It should be noted that the preset pressure value of the first pressure sensor 216 is the set pressure value of the double-acting hydraulic cylinder 23, and the preset pressure value of the second pressure sensor 217 is the pressure value set by the first accumulator 211, wherein the pressure value set by the first accumulator 211 is smaller than the set pressure value of the double-acting hydraulic cylinder 23, so that the first accumulator 211 can smoothly supply oil to the double-acting hydraulic cylinder 23.

[0039] Optionally, the structure of the second control oil circuit 22 is the same as that of the first control oil circuit 21 .

[0040] In some embodiments, the second control assembly 3 includes a second delivery pipeline 31 and a second control valve 32 disposed on the second delivery pipeline 31. The second control valve 32 can control the on-off of the second delivery pipeline 31, and the inlet of the second delivery pipeline 31 is connected to the oil outlet of the oil supply assembly 1, and the outlet of the second delivery pipeline 31 can supply oil to the friction element of the electric vehicle single-stage reducer, that is, lubricate and cool the friction element of the electric vehicle single-stage reducer, thereby ensuring the smooth operation of the electric vehicle single-stage reducer.

[0041] In some embodiments, the third control assembly 4 includes a third delivery pipeline 41 and a third control valve 42 disposed on the third delivery pipeline 41. The third control valve 42 can control the on-off of the third delivery pipeline 41, the inlet of the third delivery pipeline 41 is connected to the oil outlet of the oil supply assembly 1, and the outlet of the third delivery pipeline 41 can supply oil to the gear mechanism of the electric vehicle single-stage reducer, that is, lubricate and cool the gear mechanism of the electric vehicle single-stage reducer.

[0042] Specifically, the oil supply assembly 1 includes an oil supply pump 11 and an oil storage tank 12. The outlet of the oil storage tank 12 is connected to the inlet of the oil supply pump 11, and the inlet of the first control oil circuit 21, the inlet of the second control oil circuit 22, the second control assembly 3, and the third control assembly 4 are all connected to the outlet of the oil supply pump 11 in a disconnectable manner, so that the hydraulic oil in the oil storage tank 12 can be transported to the first control oil circuit 21, the second control oil circuit 22, the second control assembly 3, and the third control assembly 4 through the oil supply pump 11. Among them, the oil storage tank 12 has an oil inlet.

[0043] Optionally, the oil supply assembly 1 further includes a suction filter upstream of the oil supply pump 11 , and a pressure filter downstream of the oil supply pump 11 .

[0044] In this embodiment, the hydraulic control system of the electric vehicle single-stage reducer further includes a pressure regulating assembly 5, which includes a pressure regulating pipeline 51, a second one-way valve 52 and a relief valve 53 arranged on the pressure regulating pipeline 51, the inlet of the pressure regulating pipeline 51 is connected to the oil storage tank 12, the outlet of the pressure regulating pipeline 51 is connected to the outlet of the oil supply pump 11, the second one-way valve 52 is located between the oil storage tank 12 and the relief valve 53, and the pressure values ​​in the first control oil circuit 21, the second control oil circuit 22, the second control assembly 3, and the third control assembly 4 are lower than the set pressure value of the relief valve 53. In this way, the relief valve 53 can ensure that the pressure values ​​in the first control oil circuit 21, the second control oil circuit 22, the second control assembly 3, and the third control assembly 4 are lower than the set pressure value of the relief valve 53, thereby protecting the safe operation of the hydraulic control system of the electric vehicle single-stage reducer.

[0045] Optionally, the hydraulic control system of the electric vehicle single-stage reducer also includes a controller 6, and the first pressure sensor 216, the second pressure sensor 217, the first control valve 213, the second control valve 32, and the third control valve 42 are all electrically connected to the controller 6. The controller 6 controls the switching of the first control valve 213, the second control valve 32, and the third control valve 42, and can receive the pressure values ​​detected by the first pressure sensor 216 and the second pressure sensor 217.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A hydraulic control system for a single-stage reducer of a tram, characterized in that: include: Oil supply assembly (1); A first control assembly (2) comprises a first control oil circuit (21), a second control oil circuit (22) and a double-acting hydraulic cylinder (23); the inlet of the first control oil circuit (21) and the inlet of the second control oil circuit (22) are both connected to the oil outlet of the oil supply assembly (1) in an on-off manner; two chambers of the double-acting hydraulic cylinder (23) are respectively connected to the outlet of the first control oil circuit (21) and the outlet of the second control oil circuit (22); the first control oil circuit (21) has a first accumulator (211), and the second control oil circuit (22) has a second accumulator (221); the first accumulator (211) can alternately supply oil to one chamber of the double-acting hydraulic cylinder (23) with the oil supply assembly (1); the second accumulator (221) can alternately supply oil to the other chamber of the double-acting hydraulic cylinder (23) with the oil supply assembly (1); and the double-acting hydraulic cylinder (23) can be connected to a clutch of a single-stage reducer of a tram; A second control component (3) is connected to the oil outlet of the oil supply component (1) in an on-off manner and is capable of supplying oil to the friction element of the electric vehicle single-stage reducer; The third control component (4) is connected to the oil outlet of the oil supply component (1) in an on-off manner and is capable of supplying oil to the gear mechanism of the electric vehicle single-stage reducer.

2. The hydraulic control system for a single-stage reducer of a tram according to claim 1, characterized in that: The first control oil circuit (21) comprises a first delivery pipeline (212) and a first control valve (213) and a first pressure regulating valve (214) arranged on the first delivery pipeline (212); the inlet of the first control valve (213) is connected to the oil outlet of the oil supply assembly (1); the inlets of the first accumulator (211) and the first pressure regulating valve (214) are both connected to the outlet of the first control valve (213); a cavity of the double-acting hydraulic cylinder (23) and the oil inlet of the oil supply assembly (1) are both connected to the outlet of the first pressure regulating valve (214).

3. The hydraulic control system for a single-stage reducer of a tram according to claim 2, characterized in that: The first control oil circuit (21) comprises a first one-way valve (215), and the first one-way valve (215) is arranged on a pipeline connecting the outlet of the first pressure regulating valve (214) and the oil inlet of the oil supply assembly (1).

4. The hydraulic control system for a single-stage reducer of a tram according to claim 2, characterized in that: The first control oil circuit (21) comprises a first pressure sensor (216) arranged on the first delivery pipeline (212), and the first pressure sensor (216) is located between the first pressure regulating valve (214) and the double-acting hydraulic cylinder (23).

5. The hydraulic control system for a single-stage reducer of a tram according to claim 4, characterized in that: The first control oil circuit (21) further comprises a second pressure sensor (217) arranged on the first delivery pipeline (212), and the second pressure sensor (217) is located between the first accumulator (211) and the inlet of the first pressure regulating valve (214).

6. The hydraulic control system for a single-stage reducer of a tram according to claim 5, characterized in that: The first control oil circuit (21) has a first working state and a second working state. In the first working state, the pressure value in the first control oil circuit (21) is lower than the pressure value preset by the second pressure sensor (217), and the oil supply component (1) supplies oil to the first accumulator (211); in the second working state, the pressure value in the first control oil circuit (21) is higher than the pressure value preset by the first pressure sensor (216), and the oil supply component (1) stops supplying oil to the first accumulator (211).

7. The hydraulic control system for a single-stage reducer of a tram according to claim 1, characterized in that: The second control assembly (3) comprises a second delivery pipeline (31) and a second control valve (32) arranged on the second delivery pipeline (31); the second control valve (32) is capable of controlling the on-off of the second delivery pipeline (31); the inlet of the second delivery pipeline (31) is connected to the oil outlet of the oil supply assembly (1); and the outlet of the second delivery pipeline (31) is capable of supplying oil to the friction element of the electric vehicle single-stage reducer.

8. The hydraulic control system for a single-stage reducer of a tram according to claim 1, characterized in that: The third control assembly (4) comprises a third delivery pipeline (41) and a third control valve (42) arranged on the third delivery pipeline (41); the third control valve (42) is capable of controlling the on-off of the third delivery pipeline (41); the inlet of the third delivery pipeline (41) is connected to the oil outlet of the oil supply assembly (1); and the outlet of the third delivery pipeline (41) is capable of supplying oil to the gear mechanism of the electric vehicle single-stage reducer.

9. The hydraulic control system for a single-stage reducer of a tram according to any one of claims 1 to 8, characterized in that: The oil supply assembly (1) comprises an oil supply pump (11) and an oil storage tank (12); the outlet of the oil storage tank (12) is connected to the inlet of the oil supply pump (11); the inlet of the first control oil circuit (21), the inlet of the second control oil circuit (22), the second control assembly (3), and the third control assembly (4) are all connected to the outlet of the oil supply pump (11) in a disconnectable manner.

10. The hydraulic control system for a single-stage reducer of a tram according to claim 9, characterized in that: The electric vehicle single-stage reducer hydraulic control system further comprises a pressure regulating component (5), the pressure regulating component (5) comprising a pressure regulating pipeline (51) and a second one-way valve (52) and a relief valve (53) arranged on the pressure regulating pipeline (51); the inlet of the pressure regulating pipeline (51) is connected to the oil storage tank (12); the outlet of the pressure regulating pipeline (51) is connected to the outlet of the oil supply pump (11); the second one-way valve (52) is located between the oil storage tank (12) and the relief valve (53); the pressure values ​​in the first control oil circuit (21), the second control oil circuit (22), the second control component (3) and the third control component (4) are lower than the set pressure value of the relief valve (53).

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