A hydraulic power distribution device for a vehicle steering system

Abstract

The present application is suitable for the technical field of hydraulic system matching equipment, and provides a vehicle steering system hydraulic power distribution device, which comprises an oil distributor body, the oil distributor body is provided with a main oil supply interface for connecting a hydraulic pump, a main oil return interface for connecting a hydraulic oil tank, an accumulator interface for connecting an accumulator, an amplifier oil inlet interface for connecting an oil inlet end of a flow amplifier, and an amplifier oil return interface for connecting an oil return end of the flow amplifier, the hydraulic pump, the steering accumulator and the flow amplifier are connected through an oil circuit inside the discharge oil distributor, a hydraulic control reversing valve and an amplifier oil return overflow valve are connected in parallel on the amplifier oil return pipeline, so that the steering wheel can freely move when the steering system fails, the accumulator unloading can be controlled through a proportional speed regulating electromagnetic valve when the accumulator main pipeline is over-pressured, so as to protect the system, the automatic liquid supplement of the accumulator is realized through the cooperation of the main oil supply pilot overflow valve and the pilot unloading valve, and the stable operation of the hydraulic system is realized.

Description

Technical Field

[0001] This invention relates to the field of hydraulic system supporting equipment technology, and provides a hydraulic power distribution device for a vehicle steering system. Background Technology

[0002] Currently, most common engineering machinery vehicles use hydraulically controlled steering systems. These systems typically employ an open system consisting of a steering pump, steering gear (which may have a priority valve), and steering cylinders. This method directly drives the steering gear via a hydraulic pump. However, due to the high loads of engineering machinery vehicles, the required hydraulic pumps are also large. Furthermore, even when the steering gear is not in operation, the hydraulic pump must operate at a certain power level to maintain a standby state. This structure results in high energy consumption. Additionally, if the hydraulic pump suddenly fails, the entire hydraulic steering system may momentarily lose control, potentially leading to danger. Therefore, some hydraulic system designs incorporate accumulators and flow amplifiers to reduce standby losses of the hydraulic pump. However, currently, there is no device that can stably connect the hydraulic pump, accumulator, and flow amplifier in the oil circuit and promptly release pressure to protect the entire system in the event of a fault in any part of the oil circuit. Summary of the Invention

[0003] Therefore, the present invention provides a hydraulic power distribution device for a vehicle steering system. The device connects a hydraulic pump, a steering accumulator, and a flow amplifier via oil circuits and various valves within the hydraulic system discharge distributor. By adding a steering accumulator between the hydraulic pump, the steering gear, and the steering hydraulic cylinder, the accumulator can store hydraulic pressure from the hydraulic pump when the steering gear is not in operation. When the steering gear is in operation, the steering accumulator and the hydraulic pump can jointly supply pressure to the steering system through the flow amplifier. The hydraulic system discharge distributor in this invention enables the oil circuit connection between the hydraulic pump, the steering accumulator, and the flow amplifier, while also ensuring the stable operation of the entire hydraulic system.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic power distribution device for a vehicle steering system, comprising a distributor body, wherein the distributor body is provided with a main oil supply interface, a main oil return interface, an accumulator interface, an amplifier inlet interface, and an amplifier return interface; the main oil supply interface is connected to a main oil supply pipeline; the accumulator interface is connected to an accumulator main pipeline; the main oil supply pipeline is connected to the accumulator main pipeline; a main oil supply check valve is provided at the connection point between the main oil supply pipeline and the accumulator main pipeline; the amplifier inlet interface is connected to the accumulator main pipeline via an amplifier oil supply pipeline; and an amplifier oil supply check valve is provided on the amplifier oil supply pipeline. The main oil supply port and the main oil return port are connected by a main oil supply overflow pipeline. A main oil supply pilot-operated overflow valve is installed on the main oil supply overflow pipeline. The amplifier oil supply pipeline and the main oil return port are connected by an accumulator return pipeline. The pilot valve body of the main oil supply pilot-operated overflow valve is connected to a main oil supply overflow valve control pipeline. The other end of the main oil supply overflow valve control pipeline is connected to the accumulator return pipeline. A pilot-operated unloading valve is installed on the main oil supply overflow valve control pipeline. The pilot valve body of the pilot-operated unloading valve is connected to the accumulator main pipeline. The amplifier return port and the main oil return port are connected by an amplifier return pipeline.

[0005] Furthermore, a hydraulically controlled directional valve and an amplifier return oil overflow valve are provided on the amplifier return oil line. The aforementioned hydraulically controlled directional valve and the amplifier return oil overflow valve are connected in parallel on the amplifier return oil line. The aforementioned hydraulically controlled directional valve is also connected to the accumulator main line.

[0006] Furthermore, the oil separator body is also provided with a hydraulically controlled directional valve pressure test port, which is connected to the amplifier return oil line via a pipeline.

[0007] Furthermore, a proportional speed regulating solenoid valve is installed on the accumulator return oil line.

[0008] Furthermore, the oil distributor body is also equipped with a main oil supply overflow valve pressure test port, which is connected to the main oil supply overflow pipeline via a pipeline.

[0009] Furthermore, the oil separator body is also provided with an accumulator pressure test port, which is connected to the accumulator return oil pipeline via a pipeline.

[0010] Furthermore, the oil distributor body is also provided with a backup oil return interface, which is connected to the accumulator oil return pipeline, the amplifier oil return pipeline and the main oil supply overflow pipeline through pipelines.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] 1. By installing a hydraulic directional valve and an amplifier return oil relief valve in parallel on the amplifier return oil line, when there is pressure in the accumulator, the hydraulic directional valve can be pushed to open, and the flow amplifier can return oil smoothly. When there is no pressure in the accumulator, it means that the accumulator has malfunctioned. At this time, the hydraulic directional valve will not open, and the flow amplifier will return oil. Because there is a back pressure value in the amplifier return oil relief valve, the steering wheel can be prevented from moving freely when a malfunction occurs.

[0013] 2. By installing a proportional speed regulating solenoid valve on the accumulator return oil line and setting the unloading flow rate of the proportional speed regulating solenoid valve, the accumulator can be unloaded when the main pipeline of the accumulator is overpressured, so as to protect the system.

[0014] 3. By cooperating with the main oil supply pilot-operated relief valve and the pilot-operated unloading valve, the accumulator can be automatically replenished with fluid. When the accumulator is working, the hydraulic oil pressure in the accumulator decreases. When the pressure drops to a certain percentage of the set value, the pilot-operated unloading valve closes. At this time, the main oil supply pilot-operated relief valve can be controlled to prevent overflow, so the hydraulic pump can replenish fluid to the accumulator until the pressure value in the accumulator reaches the set pressure of the pilot-operated unloading valve. The pilot-operated unloading valve then opens again, and the main oil supply pilot-operated relief valve can be controlled to start overflowing, and the hydraulic pump returns to the unloading process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a hydraulic power distribution device for a vehicle steering system mentioned in Embodiment 1 of the present invention;

[0016] Figure 2 for Figure 1 A schematic diagram of the structure of a hydraulic power distribution device for a vehicle steering system from another angle in Embodiment 1;

[0017] Figure 3 This is a schematic diagram of a hydraulic power distribution device for a vehicle steering system mentioned in Embodiment 1 of the present invention;

[0018] Figure 4 This is a schematic diagram of the structure of a hydraulic power distribution device for a vehicle steering system mentioned in Embodiment 2 of the present invention;

[0019] Figure 5 for Figure 4 An exploded view of the structure of a hydraulic power distribution device for a vehicle steering system mentioned in Example 2;

[0020] Figure 6 This is a schematic diagram of a hydraulic power distribution device for a vehicle steering system mentioned in Embodiment 2 of the present invention.

[0021] In the diagram: 1. Main oil supply interface; 101. Main oil supply line; 102. Main oil supply overflow line; 2. Accumulator interface; 201. Accumulator main line; 3. Amplifier inlet interface; 301. Amplifier oil supply line; 302. Accumulator return line; 4. Amplifier return interface; 401. Amplifier return line; 5. Main return interface; 6. Main oil supply check valve; 7. Amplifier oil supply check valve; 8. Proportional speed control solenoid valve; 9. Main oil supply pilot-operated overflow valve; 901. Main oil supply overflow valve control line; 10. Pilot-operated unloading valve; 11. Hydraulic directional valve; 12. Amplifier return overflow valve; 13. Main oil supply overflow valve pressure test port; 14. Accumulator pressure test port; 15. Hydraulic directional valve pressure test port; 16. Spare return interface. Detailed Implementation

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] Example 1, refer to Appendix Figure 1 ~Attached Figure 3This invention provides a hydraulic power distribution device for a vehicle steering system, comprising a distributor body. The distributor body is provided with a main oil supply interface 1, a main oil return interface 5, an accumulator interface 2, an amplifier inlet interface 3, and an amplifier return interface 4. The main oil supply interface 1 is connected to a hydraulic pump, the main oil return interface 5 is connected to a hydraulic oil tank, the accumulator interface 2 is connected to an accumulator, the amplifier inlet interface 3 is connected to the inlet of a flow amplifier, and the amplifier return interface 4 is connected to the return of the flow amplifier. The main oil supply interface 1 is connected to a main oil supply line 101, and the accumulator interface 2 is connected to an accumulator main line 201. The main oil supply line 101 and the accumulator main line 201 are interconnected. A main oil supply check valve 6 is installed at the position connecting to the accumulator main pipeline 201. The main oil supply check valve 6 is set to provide one-way communication from the main oil supply interface 1 to the accumulator interface 2. The aforementioned amplifier oil inlet interface 3 is connected to the accumulator main pipeline 201 through the amplifier oil supply pipeline 301. Thus, the accumulator main pipeline 201 has two functions: supplying oil from the hydraulic pump to the accumulator and supplying oil from the accumulator to the flow amplifier. An amplifier oil supply check valve 7 is installed on the aforementioned amplifier oil supply pipeline 301. The amplifier oil supply check valve 7 is set to provide one-way communication from the accumulator interface 2 to the amplifier oil supply interface. With the cooperation of the amplifier oil supply check valve 7 and the main oil supply check valve 6, the accumulator and the hydraulic pump can supply oil to the flow amplifier. In a unidirectional fluid supply system, the hydraulic oil in the flow amplifier cannot flow back from the amplifier's supply port to the distributor body. The main supply port 1 and the main return port 5 are connected via a main supply overflow pipe 102, which is equipped with a main supply pilot-operated overflow valve 9. The amplifier supply pipe 301 and the main return port 5 are connected via an accumulator return pipe 302, which is equipped with a proportional speed control solenoid valve 8. This valve is connected to a DC power supply to control the accumulator unloading. When the pressure in the accumulator main pipe 201 and the amplifier supply pipe 301 exceeds the set value of the proportional speed control solenoid valve 8, the valve opens to unload the pressure. This structure prevents… Overpressure in the accumulator-related pipelines: The pilot valve body of the aforementioned main oil supply pilot-operated relief valve 9 is connected to the main oil supply relief valve control pipeline 901. The other end of the main oil supply relief valve control pipeline 901 is connected to the accumulator return oil pipeline 302. A pilot-operated unloading valve 10 is installed on the aforementioned main oil supply relief valve control pipeline 901. The pilot valve body of the aforementioned pilot-operated unloading valve 10 is connected to the accumulator main pipeline 201 through a pipeline. The opening and closing control of the pilot-operated unloading valve 10 depends on the pressure of the accumulator main pipeline 201, while the opening and closing of the main oil supply pilot-operated relief valve 9 is controlled by the pilot-operated unloading valve 10. The aforementioned amplifier return oil interface 4 and the main return oil interface 5 are connected through the amplifier return oil pipeline 401. This pipeline is used for the return oil of the flow amplifier.

[0024] In a further embodiment, the distributor body is also equipped with a main oil supply overflow valve pressure test port 13, an accumulator pressure test port 14, and a backup return oil interface 16. The aforementioned main oil supply overflow valve pressure test port 13 is connected to the main oil supply overflow pipeline 102 via a pipeline and is used to monitor the pressure inside the main oil supply overflow pipeline 102 and the main oil supply pipeline 101. The aforementioned accumulator pressure test port 14 is connected to the accumulator return oil pipeline 302 via a pipeline and is used to monitor the pressure inside the accumulator main pipeline 201 and the amplifier oil supply pipeline 301. The aforementioned backup return oil interface 16 is connected to the accumulator return oil pipeline 302, the amplifier return oil pipeline 401, and the main oil supply overflow pipeline 102 via a pipeline. The backup return oil interface 16 is mainly to provide an alternative when the main return oil interface 5 is blocked or has other problems. Under normal circumstances, it is blocked.

[0025] The working principle of this embodiment is as follows:

[0026] After the system is powered on, the hydraulic pump injects high-pressure oil into the accumulator through the main oil supply line 101. When the pressure in the accumulator is lower than the set pressure of the pilot-operated unloading valve 10, the high-pressure oil continues to flow into the accumulator. When the pressure in the accumulator reaches the set pressure of the pilot-operated unloading valve 10, the pilot-operated unloading valve 10 opens. At this time, the oil from the accumulator main line 201 reaches and opens the main oil supply pilot-operated relief valve 9. The high-pressure oil from the hydraulic pump then overflows directly from the main oil supply pilot-operated relief valve 9 to the main return oil port 5. At this time, the hydraulic oil pressure in the accumulator reaches the standard, and the hydraulic pump is in a low-power unloading state. During this process, since the opening of the main oil supply pilot-operated relief valve 9 comes from the pressure within the accumulator, the hydraulic pump does not need to overcome the relief valve to do work. Therefore, it can operate with very low power, achieving maximum energy saving. When the steering gear starts... During operation, the flow amplifier begins supplying high-pressure oil to the steering system. At the same time, the accumulator begins supplying oil to the flow amplifier, while the amplifier's return port 4 begins returning oil to the main return port 5. During this process, the hydraulic oil pressure in the accumulator decreases. When this pressure is lower than a certain percentage of the set pressure of the pilot unloading valve 10 (for example, lower than 80% of the set pressure of the pilot unloading valve 10), the pilot unloading valve 10 closes. This also controls the main oil supply pilot relief valve 9 to close, and the high-pressure oil from the hydraulic pump stops overflowing and begins to replenish the accumulator until the accumulator pressure meets the set pressure of the pilot unloading valve 10. At this time, the pilot unloading valve 10 reopens, and the hydraulic pump enters the low-power unloading state again. The above process is repeated during the operation of the steering gear to ensure that the accumulator can maintain a certain pressure to continuously supply fluid to the steering gear.

[0027] Example 2, refer to Appendix Figure 4 ~Attached Figure 6Based on the hydraulic power distribution device for a vehicle steering system described in Embodiment 1, a hydraulically controlled directional valve 11 and an amplifier return oil overflow valve 12 are provided on the amplifier return oil line 401. The hydraulically controlled directional valve 11 and the amplifier return oil overflow valve 12 are connected in parallel on the amplifier return oil line 401. The aforementioned hydraulically controlled directional valve 11 is also connected to the accumulator main line 201. The hydraulically controlled directional valve 11 is controlled by the pressure of the accumulator main line 201. The distributor body is also provided with a hydraulically controlled directional valve pressure test port 15. The aforementioned hydraulically controlled directional valve pressure test port 15 is connected to the amplifier return oil line 401 through a pipeline.

[0028] The working principle of this embodiment is as follows:

[0029] Based on the working principle of the hydraulic power distribution device for a vehicle steering system described in Embodiment 1, since a hydraulic control directional valve 11 and an amplifier return oil overflow valve 12 are connected in parallel on the amplifier return oil line 401 in Embodiment 2, when there is pressure in the accumulator, the hydraulic control directional valve 11 can be opened by controlling the pressure of the accumulator main line 201. At this time, the amplifier return oil line 401 can smoothly return oil from the hydraulic control directional valve 11 to the main return oil interface 5. When there is no pressure in the accumulator, it means that the accumulator cannot supply power to the steering system normally, and the steering system malfunctions. At this time, the hydraulic control directional valve 11 is closed, and the flow amplifier return oil can only pass through the amplifier return oil overflow valve 12. The amplifier return oil overflow valve 12 has a back pressure value, which is adjustable. Therefore, if the steering wheel needs to move, it needs to overcome this back pressure value. This can prevent the steering wheel from moving freely when the steering system cannot operate normally.

[0030] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0031] The above are merely preferred embodiments of the present invention. Any person skilled in the art may modify the present invention or modify it into an equivalent technical solution using the technical solutions described above. Therefore, any simple modifications or equivalent substitutions made based on the technical solutions of the present invention are within the scope of protection claimed by the present invention.

Claims

1. A hydraulic power distribution device for a vehicle steering system, comprising a distributor body, characterized in that, The aforementioned oil distributor body is equipped with a main oil supply port, a main oil return port, an accumulator port, an amplifier inlet port, and an amplifier return port. The main oil supply port is connected to a main oil supply line, and the accumulator port is connected to an accumulator main line. The main oil supply line and the accumulator main line are connected in a continuous manner, and a main oil supply check valve is installed at the connection point between the main oil supply line and the accumulator main line. The amplifier inlet port is connected to the accumulator main line via an amplifier oil supply line, and an amplifier oil supply check valve is installed on the amplifier oil supply line. The main oil supply port and the main return port are connected via the main oil supply line. The overflow pipeline is connected, and a main oil supply pilot-operated overflow valve is installed on the aforementioned main oil supply overflow pipeline. The aforementioned amplifier oil supply pipeline and the main return oil interface are connected through the accumulator return oil pipeline. The pilot valve body of the aforementioned main oil supply pilot-operated overflow valve is connected to the main oil supply overflow valve control pipeline. The other end of the main oil supply overflow valve control pipeline is connected to the accumulator return oil pipeline. A pilot-operated unloading valve is installed on the aforementioned main oil supply overflow valve control pipeline. The pilot valve body of the aforementioned pilot-operated unloading valve is connected to the accumulator main pipeline through a pipeline. The aforementioned amplifier return oil interface and the main return oil interface are connected through the amplifier return oil pipeline.

2. The hydraulic power distribution device for a vehicle steering system according to claim 1, characterized in that, The amplifier return oil line is equipped with a hydraulically controlled directional valve and an amplifier return oil overflow valve. The aforementioned hydraulically controlled directional valve and the amplifier return oil overflow valve are connected in parallel on the amplifier return oil line. The aforementioned hydraulically controlled directional valve is also connected to the accumulator main line.

3. A hydraulic power distribution device for a vehicle steering system according to claim 2, characterized in that, The oil separator body is also equipped with a hydraulically controlled directional valve pressure test port, which is connected to the amplifier return oil line via a pipeline.

4. A hydraulic power distribution device for a vehicle steering system according to claim 1, characterized in that, A proportional speed regulating solenoid valve is installed on the accumulator return oil pipeline.

5. A hydraulic power distribution device for a vehicle steering system according to claim 1, characterized in that, The oil separator body is also equipped with a main oil supply overflow valve pressure test port, which is connected to the main oil supply overflow pipeline via a pipeline.

6. A hydraulic power distribution device for a vehicle steering system according to claim 1, characterized in that, The oil separator body is also equipped with an accumulator pressure test port, which is connected to the accumulator return oil pipeline via a pipeline.

7. A hydraulic power distribution device for a vehicle steering system according to claim 1, characterized in that, The oil separator body is also equipped with a backup oil return port, which is connected to the accumulator oil return pipeline, the amplifier oil return pipeline and the main oil supply overflow pipeline through pipelines.

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