Composite steering system of large transport vehicle

Abstract

The invention discloses a composite steering system of a large transport vehicle. The composite steering system comprises a conventional steering hydraulic loop and an emergency steering hydraulic loop. The conventional loop is provided with an engine and a conventional steering pump, the conventional steering pump is connected to a power take-off port of the engine and senses a command of a steering gear through an LS pilot hydraulic system, and the output end is connected to a flow amplifier through a first pipeline. The emergency loop is provided with an emergency steering pump, the emergency steering pump is connected to a power take-off port of the transfer case, the output end of the emergency steering pump is connected with a two-position three-way hydraulic valve, a first oil outlet of the two-position three-way hydraulic valve is connected to the flow amplifier through a second pipeline, and a second oil outlet of the two-position three-way hydraulic valve is connected to the oil tank; a third pipeline is connected to the first pipeline and connected to the power end of the two-position three-way hydraulic valve. A conventional steering pump serves as a main pump, an emergency steering pump serves as an auxiliary pump, when the oil supply pressure of the main pump is insufficient, the auxiliary pump works to guarantee the oil supply capacity of the system for emergency steering, and the failure condition of an engine or the conventional steering pump is considered.

Description

technical field [0001] The invention relates to a vehicle steering system, in particular to a steering system of a large transport vehicle, which realizes an emergency steering function. Background technique [0002] The current vehicle steering systems are commonly hydraulic power steering systems and electric power steering systems. For hydraulic power steering, the steering pump is driven by the engine. After the steering wheel is turned, the steering gear outputs the force to the steering transmission according to the size and direction requirements. The engine drives the steering pump to pump oil to the steering cylinder according to the steering requirements. The steering transmission mechanism acts to drive the left and right front wheels to steer; for electric power steering, the principle is the same, the motor drives the steering pump. [0003] No matter what kind of power steering system the vehicle is equipped with, there is only one conventional steering system...

AI Technical Summary

Problems solved by technology

[0003] No matter what kind of power steering system the vehicle is equipped with, there is only one conventional steering system, and there is no backup system, which will cause driving hazards in emergency situations

For the hydraulic power steering system, once the engine is idling or the steering pump is broken, the steering will not be possible; for the electric power steering, once the power is insufficient or the steering pump is broken, the steering will not be possible.

[0004] In addition, for large vehicles, the axle load on the front axle is relatively large. When the conventional steering system cannot meet the steering power, it is also necessary to supplement the steering power.

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