Emergency steering system

Abstract

The invention relates to the field of automobile power-assisted steering, in particular to an emergency steering system. The system comprises an oil can, a main oil pump, an emergency module and a steering gear box, the oil pot, the main oil pump, the emergency module, the steering gear box and the oil pot are communicated in a closed-loop mode, and the oil pot is communicated with the emergency module; when the main oil pump normally operates, hydraulic oil sequentially circulates along the oil can, the main oil pump, the emergency module, the steering gear box and the oil can; when the main oil pump is damaged and the hydraulic oil flow is lower than a set flow value, the main path hydraulic oil sequentially circulates along the oil can, the main oil pump, the emergency module, the steering gear box and the oil can, and the auxiliary path hydraulic oil sequentially circulates along the oil can, the emergency module, the steering gear box and the oil can; and during trailer, the main oil pump does not convey hydraulic oil, and the emergency module operates and provides hydraulic oil for the steering gear box. The hydraulic steering system solves the problems that in the running process of an existing hydraulic steering system vehicle, no hydraulic power is provided after a main oil pump loses efficacy, and no hydraulic power is provided for the steering system when the vehicle breaks down.

Description

Technical Field

[0001] The invention relates to the field of automobile power steering, in particular to an emergency steering system. Background Art

[0002] The steering systems of existing commercial vehicles are all hydraulic systems, and the hydraulic pressure is driven by the engine or high-voltage motor with an oil pump. However, when the hydraulic pump fails, the steering system will directly lose hydraulic power, and the steering hand force will vary greatly, threatening the driving safety of the vehicle. In addition, the vehicle has no hydraulic power during the towing process, and the driving hand force of the vehicle varies greatly. During the towing process, the risk of secondary accidents is extremely high. Summary of the invention

[0003] The purpose of the present invention is to solve the problems existing in the background technology and propose an emergency steering system to solve the problems of no hydraulic assistance after the main oil pump of the existing hydraulic steering system fails during driving and no hydraulic assistance in the steering system when the vehicle fails to trailer.

[0004] The technical solution of the present invention is an emergency steering system, comprising an oil pot, a main oil pump, an emergency module and a steering gear; the oil pot, the main oil pump, the emergency module, the steering gear and the oil pot are connected in a closed loop, and the oil pot is connected to the emergency module; when the main oil pump operates normally, the hydraulic oil flows in sequence along the oil pot, the main oil pump, the emergency module, the steering gear and the oil pot; when the main oil pump is damaged and the hydraulic oil flow rate is lower than the set flow rate value, the main hydraulic oil flows in sequence along the oil pot, the main oil pump, the emergency module, the steering gear and the oil pot, and the auxiliary hydraulic oil flows in sequence along the oil pot, the emergency module, the steering gear and the oil pot; when towing a vehicle, the main oil pump does not deliver hydraulic oil, the emergency module operates and provides hydraulic oil to the steering gear.

[0005] Preferably, the emergency module includes an emergency valve and an emergency pump, the emergency valve has an oil inlet a, an oil inlet b and an oil outlet, the emergency valve oil inlet b is connected to the emergency pump, and the emergency valve oil outlet is connected to the steering gear.

[0006] Preferably, the main oil pump is communicated with the emergency valve oil inlet a.

[0007] Preferably, the oil pot has an oil outlet a and an oil outlet b, the oil pot oil outlet a is connected to the main oil pump, and the emergency pump is connected to the oil pot oil outlet b.

[0008] Preferably, the emergency valve comprises a valve body and a built-in flow sensor and flow reversing valve assembly.

[0009] Preferably, when the main oil pump operates normally, the emergency pump flow is output to the oil pot by the flow reversing valve assembly built into the emergency valve; when the main oil pump is damaged and the flow sensor detects that the hydraulic oil flow is lower than the set flow value, the flow reversing valve assembly built into the emergency valve will reverse the emergency pump flow and output it to the emergency valve oil outlet, and provide flow to the steering gear together with the main oil pump; when the main oil pump is not operating, the flow sensor does not detect the hydraulic oil flow, and the flow reversing valve assembly built into the emergency valve will reverse the emergency pump flow and output it to the emergency valve oil outlet, and provide flow to the steering gear.

[0010] Preferably, the flow sensor is arranged on the valve body and located between the main check valve and the slide valve, the valve body is provided with a main passage and an auxiliary passage, the auxiliary passage is communicated with the main passage, and the flow reversing valve assembly comprises a main check valve and a slide valve arranged in the main passage, and an auxiliary check valve arranged in the auxiliary passage;

[0011] When the main oil pump operates normally, the main check valve opens, the auxiliary check valve closes, and the slide valve moves to the right and detaches from the guide rod of the flow sensor;

[0012] When the main oil pump is damaged and the flow sensor detects that the hydraulic oil flow is lower than the set flow value, both the main check valve and the auxiliary check valve are opened, and the slide valve moves to the left and contacts the guide rod of the flow sensor;

[0013] When the main oil pump is not running, the flow sensor does not detect the hydraulic oil flow, the main check valve is closed, the auxiliary check valve is opened, and the slide valve contacts the guide rod of the flow sensor.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects:

[0015] The present invention can provide hydraulic assistance after the main oil pump fails during vehicle driving, and provide hydraulic assistance to the steering system when the vehicle breaks down and tows, thereby ensuring vehicle driving safety and preventing secondary accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0017] Figure 2 This is the structural explosion diagram of the emergency valve;

[0018] Figure 3 Schematic diagram of hydraulic oil flow in the emergency valve when the main oil pump is running and the emergency pump is not running;

[0019] Figure 4 Schematic diagram of hydraulic oil flow in the emergency valve when both the main oil pump and the emergency pump are running.

[0020] Figure numerals: 1. Oil can; 2. Main oil pump; 3. Emergency module; 31. Valve body; 32. Main check valve; 33. Auxiliary check valve; 34. Sliding valve; 35. Flow sensor; 4. Steering gear. DETAILED DESCRIPTION

[0021] like Figure 1 As shown, an emergency steering system proposed in this embodiment includes an oil tank 1, a main oil pump 2, an emergency module 3 and a steering gear 4.

[0022] The oil pot 1, the main oil pump 2, the emergency module 3, the steering gear 4 and the oil pot 1 are connected in a closed loop to form the main oil pump oil circuit. The oil pot 1 is connected to the emergency module 3, and the oil pot 1, the emergency module 3, the steering gear 4 and the oil pot 1 form the emergency system oil circuit. The emergency system oil circuit is activated when the vehicle's main oil pump is insufficient or fails to supply oil, and supplies hydraulic oil to the vehicle's steering system to provide steering assistance.

[0023] The emergency module 3 includes an emergency valve and an emergency pump, both of which are mounted on the frame of the car. The emergency pump uses a 24V emergency pump. The emergency valve has an oil inlet a, an oil inlet b and an oil outlet. The emergency valve oil inlet b is connected to the emergency pump, and the emergency valve oil outlet is connected to the steering gear 4. The main oil pump 2 is connected to the emergency valve oil inlet a. The oil pot 1 has an oil outlet a and an oil outlet b. The oil outlet a of the oil pot 1 is connected to the main oil pump 2, and the emergency pump is connected to the oil outlet b of the oil pot 1.

[0024] like Figure 2 As shown, the emergency valve includes a valve body 31, a flow sensor 35 and a flow reversing valve assembly. The flow sensor 35 is arranged on the valve body 31 and is located between the main check valve 32 and the slide valve 34. A main passage and an auxiliary passage are arranged in the valve body 31. The auxiliary passage is connected to the main passage. The two ends of the main passage are the emergency valve oil inlet a and the oil outlet respectively. The outer end of the auxiliary passage is the emergency valve oil inlet b. The flow sensor 35 can monitor the hydraulic oil flow output by the main oil pump 2 in real time. The flow reversing valve assembly includes a main check valve 32 and a slide valve 34 arranged in the main passage, and an auxiliary check valve 33 arranged in the auxiliary passage.

[0025] When the main oil pump 2 is operating normally, the flow sensor 35 on the emergency valve outputs a disconnect signal, the emergency pump does not draw hydraulic oil from the oil pot 1, and the flow of the emergency pump is output to the oil pot 1 by the flow reversing valve assembly built into the emergency valve (such as Figure 3 As shown, the main check valve 32 is opened, the auxiliary check valve 33 is closed, the slide valve 34 moves to the right and disengages from the guide rod of the flow sensor 35, the guide rod is not connected to the valve body 31, and the flow sensor 35 outputs a disconnection signal), and the hydraulic oil flows in sequence along the oil pot 1, the main oil pump 2, the emergency module 3, the steering gear 4 and the oil pot 1.

[0026] When the main oil pump 2 is damaged and the hydraulic oil flow rate is lower than the set flow rate value, the flow sensor 35 on the emergency valve outputs a connection signal, and the emergency pump draws hydraulic oil from the oil pot 1. The flow reversing valve assembly built into the emergency valve reverses the flow of the emergency pump and outputs it to the oil outlet of the emergency valve, and together with the main oil pump 2, provides flow to the steering gear 4 (such as Figure 4 As shown, the main check valve 32 and the auxiliary check valve 33 are both open, the slide valve 34 moves to the left and contacts the guide rod of the flow sensor 35, the slide valve 34, the guide rod and the valve body 31 are connected, and the flow sensor 35 outputs a connection signal), the hydraulic oil in the main circuit (main oil pump circuit) flows along the oil pot 1, the main oil pump 2, the emergency module 3, the steering gear 4 and the oil pot 1 in sequence, and the hydraulic oil in the auxiliary circuit (emergency system circuit) flows along the oil pot 1, the emergency module 3, the steering gear 4 and the oil pot 1 in sequence.

[0027] When towing is needed, the main oil pump 2 does not run, the flow sensor 35 does not detect the hydraulic oil flow, and the flow reversing valve assembly built into the emergency valve switches the emergency pump flow and outputs it to the emergency valve oil outlet (the main check valve 32 is closed, the auxiliary check valve 33 is opened, and the slide valve 34 is in contact with the guide rod of the flow sensor 35). The vehicle is equipped with a trailer steering switch, and the emergency module 3 detects the switch command, and the emergency pump immediately runs at high speed to provide hydraulic oil to the hydraulic system; the output flow of the oil outlet of the emergency module 3 is the output flow of the emergency pump.

[0028] This embodiment solves the problem that vehicles with existing hydraulic steering systems have no hydraulic assistance after the main oil pump fails during driving, and the steering system has no hydraulic assistance when towing a vehicle due to a vehicle failure. It can ensure the safety of vehicle driving and can also provide assistance when towing to prevent secondary accidents.

[0029] The flow sensor 35 monitors the flow of the main oil pump 2 in real time. The flow reversing valve assembly can immediately redirect the flow of the 24V emergency pump to the output of the main oil circuit to the steering machine 4 when the flow of the main oil pump 2 is lower than the set flow. The flow sensor 35 can output the flow output direction status of the emergency pump to the 24V emergency pump. The 24V emergency pump determines whether to speed up according to the status of the flow sensor 35, and provides hydraulic oil at a high speed and large flow.

[0030] The 24V emergency pump has a sensor status judgment function, which can determine whether the system needs to speed up and work with a large flow rate. The 24V emergency pump also has a function to judge whether the sensor status is invalid. When the flow sensor 35 fails and the system needs to speed up and output a large flow rate, it can speed up and run in time. In addition, the 24V emergency pump has a hard-line switch interface, which runs directly at high speed after being connected, providing hydraulic assistance when the vehicle is driving or towing. At the same time, the 24V emergency pump has a communication judgment function, which can upload the failure status of the main oil pump 2 to the instrument, and remind the driver to pay attention to driving safety through the instrument display.

[0031] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. An emergency steering system, characterized in that: It comprises an oil pot (1), a main oil pump (2), an emergency module (3) and a steering gear (4); The oil pot (1), the main oil pump (2), the emergency module (3), the steering gear (4) and the oil pot (1) are connected in a closed loop, and the oil pot (1) is connected to the emergency module (3); When the main oil pump (2) operates normally, the hydraulic oil flows in sequence along the oil pot (1), the main oil pump (2), the emergency module (3), the steering gear (4) and the oil pot (1); When the main oil pump (2) is damaged and the hydraulic oil flow rate is lower than the set flow rate value, the main hydraulic oil flows in sequence along the oil pot (1), the main oil pump (2), the emergency module (3), the steering gear (4) and the oil pot (1), and the auxiliary hydraulic oil flows in sequence along the oil pot (1), the emergency module (3), the steering gear (4) and the oil pot (1); When towing, the main oil pump (2) does not deliver hydraulic oil, and the emergency module (3) operates and supplies hydraulic oil to the steering gear (4).

2. An emergency steering system according to claim 1, characterized in that: The emergency module (3) comprises an emergency valve and an emergency pump. The emergency valve has an oil inlet a, an oil inlet b and an oil outlet. The emergency valve oil inlet b is connected to the emergency pump, and the emergency valve oil outlet is connected to the steering gear (4).

3. An emergency steering system according to claim 2, characterized in that: The main oil pump (2) is communicated with the emergency valve oil inlet a.

4. An emergency steering system according to claim 3, characterized in that: The oil pot (1) has an oil outlet a and an oil outlet b. The oil outlet a of the oil pot (1) is connected to the main oil pump (2), and the emergency pump is connected to the oil outlet b of the oil pot (1).

5. An emergency steering system according to claim 4, characterized in that: The emergency valve comprises a valve body (31), a built-in flow sensor (35) and a flow reversing valve assembly.

6. An emergency steering system according to claim 5, characterized in that: When the main oil pump (2) operates normally, the flow of the emergency pump is output to the oil pot (1) by the flow reversing valve assembly built into the emergency valve; when the main oil pump (2) is damaged and the flow sensor detects that the hydraulic oil flow is lower than the set flow value, the flow reversing valve assembly built into the emergency valve switches the flow of the emergency pump to the oil outlet of the emergency valve, and together with the main oil pump (2), provides flow to the steering gear (4); when the main oil pump (2) is not operating, the flow sensor (35) does not detect the hydraulic oil flow, and the flow reversing valve assembly built into the emergency valve switches the flow of the emergency pump to the oil outlet of the emergency valve, and provides flow to the steering gear (4).

7. An emergency steering system according to claim 6, characterized in that: The flow sensor (35) is arranged on the valve body (31) and is located between the main check valve (32) and the slide valve (34). A main passage and an auxiliary passage are arranged in the valve body (31). The auxiliary passage is communicated with the main passage. The flow reversing valve assembly comprises a main check valve (32) and a slide valve (34) arranged in the main passage, and an auxiliary check valve (33) arranged in the auxiliary passage. When the main oil pump (2) operates normally, the main check valve (32) opens, the auxiliary check valve (33) closes, and the slide valve (34) moves to the right and separates from the guide rod of the flow sensor (35); When the main oil pump (2) is damaged and the flow sensor (35) detects that the hydraulic oil flow is lower than the set flow value, the main check valve (32) and the auxiliary check valve (33) are both opened, and the slide valve (34) moves to the left and contacts the guide rod of the flow sensor (35); When the main oil pump (2) is not running, the flow sensor (35) does not detect the hydraulic oil flow, the main check valve (32) is closed, the auxiliary check valve (33) is opened, and the slide valve (34) contacts the guide rod of the flow sensor (35).

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