A mechanical-hydraulic servo control device for pure rolling steering of multi-axle vehicles

Abstract

The invention discloses a mechanical-hydraulic servo control device for multi-shaft automobile pure rolling steering. The mechanical-hydraulic servo control device is applied to the field of automobile steering. The mechanical-hydraulic servo control device mainly comprises a switch valve, a pressure reducing valve, a one-way valve, a transverse pull rod telescoping cylinder, a mechanical-hydraulic servo control valve, an angular displacement amplifying mechanism and the like. The mechanical-hydraulic servo control valve is used for carrying out servo control over the transverse pull rod telescoping cylinder, and it is effectively ensured that all steering wheels meet the Ackerman steering condition; by means of negative feedback control of the transverse pull rod telescoping cylinder and the mechanical-hydraulic servo control valve, high-precision dynamic pure rolling steering of an automobile is achieved; oil is supplemented to a feedback cavity automatically through the switch valve, the pressure reducing valve and the one-way valve, and generation of negative pressure is eliminated. Preferably, by means of a segmented multi-stage cam curve in the mechanical-hydraulic servo control device, the transverse pull rod telescoping cylinder can be locked mechanically and hydraulically, the risk in the high-speed traveling process is reduced while the pure rolling steering effect of the system is guaranteed, and the safety of high-speed traveling of the multi-shaft automobile is promoted.

Description

technical field [0001] The invention relates to a mechanical-hydraulic servo control device for pure rolling steering of a multi-axle vehicle, which is applied in the field of automobile steering. Background technique [0002] Large wheeled vehicles are widely used in infrastructure construction and military heavy industry, such as civilian equipment such as large-tonnage all-terrain cranes, large beam trucks, and mining dump trucks, and military equipment such as large missile transport vehicles, heavy electronic launch vehicles, and traction vehicles. special vehicles. Multi-axis steering can significantly improve the low-speed maneuverability and high-speed handling stability of large wheeled vehicles, and has become one of the key technologies to measure the development level of modern large and heavy-duty vehicles. At the same time, the development of high-performance multi-axis steering technology will help promote the development of cutting-edge transportation equipm...

AI Technical Summary

Problems solved by technology

At present, the external length adjustment device (such as nut, chute and cam plate, etc.) is often used to achieve pure rolling steering of the vehicle by changing the length of the transverse tie rod. However, due to the small steering angle of the steering wheel, the adjustment area of ​​the adjustment device is limited, resulting in vehicle steering. Difficult to control and low precision

In order to improve the steering accuracy and achieve pure rolling steering, the effective control area is also expanded by enlarging the trapezoidal structure, but this brings disadvantages such as large size and difficult layout of the steering trapezoidal mechanism (refer to patent 201110154053.5)

[0008] 3) The safety of dynamic steering in pure rolling state needs to be strengthened

However, the existing steering mechanism with pure rolling function has defects in the steering safety of the vehicle at high speed, and needs to be further improved

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