Emergency power-assisted steering system and heavy truck

Abstract

The utility model discloses an emergency power-assisted steering system which comprises a main steering pump and a steering gear and further comprises an emergency pump, an emergency valve and an oil tank, the emergency valve comprises a first oil inlet, a second oil inlet, a first oil outlet and a second oil outlet, and the main steering pump is driven by an engine and connected with the first oil inlet. The emergency pump is driven by the gearbox and connected with the second oil inlet, the first oil outlet is connected with the steering gear, and the second oil outlet is connected with the oil tank. When the main steering pump cannot work normally, emergency steering is achieved through the emergency valve and the emergency pump, complex operation is not needed, hydraulic power assistance exists as long as a vehicle is in motion, and the safety and reliability of the system are improved. The utility model further discloses a heavy truck comprising the emergency power-assisted steering system.

Description

Technical Field

[0001] The utility model relates to the field of vehicle equipment, in particular to an emergency power steering system. In addition, the utility model also relates to a heavy truck comprising the emergency power steering system. Background Art

[0002] With the development of industrial technology, automobile technology has also kept pace with the times. As an important component of automobiles, the steering system has evolved from the original pure mechanical manual drive to the current power hydraulic drive and the electric power mechanical drive of passenger cars, and the power steering performance has been improved day by day. In order to meet safety requirements, the power steering in the main steering device emphasizes that its energy supply device can be one or more, and when the power steering system fails, the driver can still complete the steering action manually, but it is difficult to meet the requirements for heavy trucks with dual steering front axles.

[0003] Heavy trucks are all large-tonnage vehicles, and many of them have more than two axles involved in steering, so a steering cylinder needs to be installed to assist in steering. In the event of an emergency when the steering oil supply system fails or the engine stops, such vehicles cannot achieve mechanical emergency steering under any driving conditions, and manual steering is not possible, which is prone to accidents. When the vane pump does not work due to damage to the vane pump or engine shutdown, the existing hydraulic steering system does not have an emergency steering function and cannot guarantee the normal steering of the vehicle and the safety of passengers.

[0004] Therefore, how to provide a safe and reliable emergency steering assist system is a technical problem that those skilled in the art currently need to solve. Utility Model Content

[0005] The purpose of the utility model is to provide an emergency power steering system, which can realize emergency steering through an emergency valve and an emergency pump when the main steering pump fails to work properly, thereby improving the safety and reliability of the system. Another purpose of the utility model is to provide a heavy truck including the emergency power steering system.

[0006] In order to solve the above technical problems, the utility model provides an emergency steering power-assist system, including a main steering pump and a steering gear, and also including an emergency pump, an emergency valve and an oil tank, the emergency valve including a first oil inlet, a second oil inlet, a first oil outlet and a second oil outlet, the main steering pump is driven by an engine and connected to the first oil inlet, the emergency pump is driven by a gearbox and connected to the second oil inlet, the first oil outlet is connected to the steering gear, and the second oil outlet is connected to the oil tank, when the vehicle is driving normally, the first oil inlet is connected to the first oil outlet, the second oil inlet is connected to the second oil outlet, and when the vehicle is driving in an emergency, the second oil inlet is connected to the first oil outlet.

[0007] Preferably, it also includes a bypass branch, one end of which is connected to the main steering pump, and the other end of which is connected to the steering gear. A throttle valve is arranged on the bypass branch, a first one-way valve is arranged at the first oil outlet, and a second one-way valve is arranged at the throttle valve outlet.

[0008] Preferably, the inlet and outlet of the throttle valve are also connected to the control ports at both ends of the emergency valve through a control pipeline.

[0009] Preferably, the emergency valve is a two-position four-way hydraulically controlled reversing valve.

[0010] Preferably, the emergency pump is a bi-rotation radial piston pump.

[0011] Preferably, it comprises two oil tanks connected in series via a middle oil port.

[0012] Preferably, an alarm control valve is provided on the pipeline between the second oil outlet and the oil tank, and the alarm control valve is used to control the opening and closing of the signal light.

[0013] Preferably, the alarm control valve is a two-position two-way hydraulically controlled reversing valve. When the vehicle is driving normally, the flow position of the alarm control valve is connected to the oil circuit. When the vehicle is driving in an emergency, the throttling position of the alarm control valve is connected to the oil circuit. The valve core of the alarm control valve is connected to the switch, and the switch controls the opening and closing of the signal light.

[0014] Preferably, the inlet of the alarm control valve is connected to the control port via a control pipeline.

[0015] The utility model provides a heavy truck, comprising the emergency steering power-assisting system as described in any one of the above items.

[0016] The utility model provides an emergency power steering system, comprising a main steering pump and a steering gear, and also comprising an emergency pump, an emergency valve and an oil tank, wherein the emergency valve comprises a first oil inlet, a second oil inlet, a first oil outlet and a second oil outlet, the main steering pump is driven by an engine and connected to the first oil inlet, the emergency pump is driven by a gearbox and connected to the second oil inlet, the first oil outlet is connected to the steering gear, and the second oil outlet is connected to the oil tank.

[0017] When the vehicle is running normally, the first oil inlet is connected to the first oil outlet, the second oil inlet is connected to the second oil outlet, and the hydraulic oil output by the main steering pump directly enters the steering gear to achieve normal steering of the vehicle. At the same time, the hydraulic oil output by the emergency pump enters the oil tank. When the engine is turned off or the main steering pump fails, the emergency valve switches the working position, the vehicle enters the emergency driving state, the second oil inlet is connected to the first oil outlet, and the hydraulic oil output by the emergency pump enters the steering gear to achieve emergency steering of the vehicle. When the main steering pump fails to work normally, emergency steering is achieved through the emergency valve and emergency pump, which can be achieved without complicated operations. As long as the vehicle is moving, there is hydraulic assistance, which improves the safety and reliability of the system.

[0018] The utility model also provides a heavy-duty truck including the above-mentioned emergency steering assist system. Since the above-mentioned emergency steering assist system has the above-mentioned technical effects, the above-mentioned heavy-duty truck should also have the same technical effects, which will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention provides a hydraulic principle diagram of a specific implementation of the emergency steering assist system.

[0020] Among them, there are a main steering pump 1, a steering gear 2, an emergency pump 3, an emergency valve 4, an oil tank 5, a throttle valve 6, a first one-way valve 7, a second one-way valve 8, an alarm control valve 9, a signal light 10, and a switch 11. DETAILED DESCRIPTION

[0021] The core of the utility model is to provide an emergency power steering system, which can realize emergency steering through an emergency valve and an emergency pump when the main steering pump fails to work properly, thereby improving the safety and reliability of the system. Another core of the utility model is to provide a heavy truck including the emergency power steering system.

[0022] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] Please refer to Figure 1 , Figure 1 The present invention provides a hydraulic principle diagram of a specific implementation of the emergency steering assist system.

[0024] The specific implementation of the utility model provides an emergency steering assist system, including a main steering pump 1, a steering gear 2, an emergency pump 3, an emergency valve 4 and an oil tank 5, wherein the emergency valve 4 includes a first oil inlet, a second oil inlet, a first oil outlet and a second oil outlet, and the emergency valve 4 includes a normal working position and an emergency working position. When the emergency valve 4 is switched to the normal working position, the first oil inlet is connected to the first oil outlet, and the second oil inlet is connected to the second oil outlet. When the emergency valve 4 is switched to the emergency working position, the second oil inlet is connected to the first oil outlet, and the first oil inlet and the second oil outlet are isolated. The main steering pump 1 is connected to the first oil inlet, the emergency pump 3 is connected to the second oil inlet, the first oil outlet is connected to the steering gear 2, and the second oil outlet is connected to the oil tank 5. At the same time, the main steering pump 1 is driven by the engine, and the emergency pump 3 is driven by the gearbox. The emergency pump 3 is installed on the gearbox or the transfer case and is dragged by the wheels. As long as the vehicle is driving and the wheels are rotating, the emergency pump 3 can work to provide hydraulic oil.

[0025] When the vehicle is running normally, the emergency valve 4 switches to the normal working position, the first oil inlet is connected to the first oil outlet, the second oil inlet is connected to the second oil outlet, and the hydraulic oil output by the main steering pump 1 directly enters the steering gear 2 through the emergency valve 4 to achieve normal steering of the vehicle. At the same time, the hydraulic oil output by the emergency pump 3 enters the oil tank 5 through the emergency valve 4. When the engine is turned off or the main steering pump 1 fails, the emergency valve 4 switches to the emergency working position, the vehicle enters the emergency driving state, the second oil inlet is connected to the first oil outlet, and the hydraulic oil output by the emergency pump 3 enters the steering gear 2 through the emergency valve 4 to achieve emergency steering of the vehicle. When the main steering pump 1 cannot work normally, emergency steering is achieved through the emergency valve 4 and the emergency pump 3. It can be achieved without complicated operations. As long as the vehicle is moving, there is hydraulic assistance, which improves the safety and reliability of the system.

[0026] Furthermore, a bypass branch is provided, one end of which is connected to the main steering pump 1, and the other end of which is connected to the steering gear 2. A throttle valve 6 is provided on the bypass branch, that is, the throttle valve 6 is provided in parallel with the emergency valve 4. In order to prevent backflow, a first one-way valve 7 is provided at the first oil outlet, and a second one-way valve 8 is provided at the outlet of the throttle valve 6.

[0027] When the vehicle is running normally, due to the limiting effect of the throttle valve 6, the hydraulic oil output by the main steering pump 1 directly enters the steering gear 2 through the emergency valve 4 and the first one-way valve 7, and does not pass through the throttle valve 6. When the vehicle is running in an emergency, the hydraulic oil output by the emergency pump 3 enters the steering gear 2 through the emergency valve 4 and the first one-way valve 7. At the same time, if the main steering pump 1 can still output hydraulic oil, it will be isolated when it reaches the first oil inlet, and then enter the bypass branch, pass through the throttle valve 6 and the second one-way valve 8, and enter the steering gear 2. The emergency pump 3 and the main steering pump 1 supply oil to the steering gear 2 at the same time.

[0028] Specifically, the inlet of the throttle valve 6 is connected to the normal end control port of the emergency valve 4 through a control pipeline, and the outlet of the throttle valve 6 is connected to the emergency end control port of the emergency valve 4 through a control pipeline. When the vehicle is running normally, the high-pressure oil output by the main steering pump 1 reaches the first oil inlet of the emergency valve 4 and the inlet of the throttle valve 6 at the same time, forming a low pressure at the outlet of the throttle valve 6, and the pressure difference between the two is transmitted to the control ports at both ends of the emergency valve 4 by the control pipeline, that is, the normal end control port is high pressure, and the emergency end control port is low pressure, pushing the emergency valve 4 to switch to the normal working position. When the vehicle is running in an emergency, that is, the engine stops or the main steering pump 1 fails and cannot output high-pressure oil, the normal end control port of the emergency valve 4 loses high pressure, and the power mechanism set at the emergency end is activated, pushing the emergency valve 4 to switch to the emergency working position. By setting the switching flow, the main circuit can automatically switch to the auxiliary circuit working state when an abnormality occurs, and it can be judged whether the main and auxiliary circuits of the steering system are working normally. Among them, the emergency valve 4 is specifically a two-position four-way hydraulic control reversing valve. Of course, the type of valve can also be adjusted according to the situation, all within the protection scope of the utility model.

[0029] In the emergency power steering system provided in the specific embodiment of the utility model, the emergency pump 3 is specifically a dual-rotation radial piston pump. It has good low-speed oil suction performance, high working pressure, and long service life. The radial piston pump adopts a special flow control structure, the output flow is very stable, and the power consumption is constant. The emergency pump 3 can achieve dual-rotation work without changing the inlet and outlet oil pipelines, and the vehicle can work normally in both forward and reverse directions.

[0030] The two oil tanks 5 are connected in series through the middle oil port, i.e., a three-port oil tank structure, so that the two circuits circulate independently, thus weakening the influence of pipeline leakage on the other circuit and ensuring that the system has enough hydraulic oil to maintain normal operation.

[0031] On the basis of the emergency power steering system provided in the above-mentioned specific embodiments, an alarm control valve 9 is provided on the pipeline between the second oil outlet and the oil tank 5, and the alarm control valve 9 is used to control the opening and closing of the signal light 10, so that the system has a fault alarm function.

[0032] Specifically, the alarm control valve 9 is a two-position two-way hydraulically controlled reversing valve. The inlet of the alarm control valve 9 is connected to the second oil outlet of the emergency valve 4, and the outlet of the alarm control valve 9 is connected to the oil tank. The alarm control valve 9 has a flow position and a throttling position. When in the flow position, the hydraulic oil flows through the alarm control valve 9 normally. When in the throttling position, the hydraulic oil decelerates and passes through the alarm control valve 9. The inlet of the alarm control valve 9 is connected to the control port through a control pipeline.

[0033] When the vehicle is running normally, the high-pressure oil output by the emergency pump 3 reaches the inlet and control port of the alarm control valve 9, forming high pressure at the control port, pushing the flow position of the alarm control valve 9 to connect to the oil circuit, and the valve core of the alarm control valve 9 drives the switch 11 to disconnect, so that the signal light 10 disconnects the circuit and goes out. When the vehicle is running in an emergency, the control port of the alarm control valve 9 loses high pressure, and the power mechanism at the throttling end drives the alarm control valve 9 to switch to the throttling position. At the same time, the valve core moves, driving the switch 11 to close, so that the signal light 10 is connected to the circuit and lights up.

[0034] In addition to the above-mentioned emergency power steering system, the specific implementation of the utility model also provides a heavy-duty truck including the above-mentioned emergency power steering system. For the structures of other parts of the heavy-duty truck, please refer to the prior art and will not be described in detail herein.

[0035] The above is a detailed introduction to the emergency power steering system and heavy truck provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. An emergency power steering system, comprising a main steering pump (1) and a steering gear (2), characterized in that: The vehicle further comprises an emergency pump (3), an emergency valve (4) and an oil tank (5); the emergency valve (4) comprises a first oil inlet, a second oil inlet, a first oil outlet and a second oil outlet; the main steering pump (1) is driven by an engine and connected to the first oil inlet; the emergency pump (3) is driven by a gearbox and connected to the second oil inlet; the first oil outlet is connected to the steering gear (2); the second oil outlet is connected to the oil tank (5); when the vehicle is running normally, the first oil inlet is connected to the first oil outlet, and the second oil inlet is connected to the second oil outlet; when the vehicle is running in an emergency, the second oil inlet is connected to the first oil outlet.

2. The emergency power steering system according to claim 1, characterized in that: It also includes a bypass branch, one end of which is connected to the main steering pump (1), and the other end of which is connected to the steering gear (2), a throttle valve (6) is provided on the bypass branch, a first check valve (7) is provided at the first oil outlet, and a second check valve (8) is provided at the outlet of the throttle valve (6).

3. The emergency steering assist system according to claim 2, characterized in that: The inlet and outlet of the throttle valve (6) are also connected to the control ports at both ends of the emergency valve (4) via control pipelines.

4. The emergency steering assist system according to claim 3, characterized in that: The emergency valve (4) is specifically a two-position four-way hydraulically controlled reversing valve.

5. The emergency steering assist system according to claim 1, characterized in that: The emergency pump (3) is specifically a bi-rotation radial piston pump.

6. The emergency power steering system according to claim 1, characterized in that: It comprises two oil tanks (5) connected in series via a middle oil port.

7. The emergency power steering system according to any one of claims 1 to 6, characterized in that: An alarm control valve (9) is provided on the pipeline between the second oil outlet and the oil tank (5), and the alarm control valve (9) is used to control the opening and closing of a signal light (10).

8. The emergency power steering system according to claim 7, characterized in that: The alarm control valve (9) is specifically a two-position two-way hydraulically controlled reversing valve. When the vehicle is running normally, the flow position of the alarm control valve (9) is connected to the oil circuit. When the vehicle is running in an emergency, the throttling position of the alarm control valve (9) is connected to the oil circuit. The valve core of the alarm control valve (9) is connected to a switch (11), and the switch (11) controls the opening and closing of the signal light (10).

9. The emergency power steering system according to claim 8, characterized in that: The inlet of the alarm control valve (9) is connected to the control port via a control pipeline.

10. A heavy truck, characterized in that: It comprises the emergency power steering system as claimed in any one of claims 1 to 9.

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