A hydraulic steering system and a variable wheel base vehicle using the system

Abstract

The invention relates to a hydraulic steering system and a variable wheel span vehicle applying the same. The hydraulic steering system comprises a left steering cylinder and a right steering cylinder, which correspond to steering wheels on both sides and are used for driving the steering wheels to change direction under a first set wheel span; the communicating cavities of the two steering cylinders are communicated, and the working cavities of the two steering cylinders serve as the oil pumping cavity and the release cavity for each other. The hydraulic steering system also comprises an oil replenishing device, and the oil replenishing device is used for, when the wheel span between the steering wheels on both sides is increased from the first set wheel span to a second set wheel span and the steering wheels on both sides are changed from a straight travelling state to a steering state, replenishing oil into the communicating cavity of the steering cylinder corresponding to the inner steering wheel of the two steering wheels so that the steering wheels on both sides can change the direction under the second set wheel span according to Ackerman steering principles. The hydraulic steering system with the oil replenishing device can effectively meet the steering requirements of the variable wheel span vehicle when the wheel span is increased; meanwhile, by adding the oil replenishing device on the basis of an existing system, the hydraulic steering system is simple in overall structure and convenient to design and mount.

Description

technical field [0001] The invention relates to a hydraulic steering system and a variable wheel base vehicle using the system. Background technique [0002] In the field of agricultural planting, the row spacing of different crops is generally different, and the row spacing of the same crop in different regions or different planting methods is also different. Row spacing, therefore, requires that the wheelbase of agricultural vehicles can be adjusted with the row spacing of crops to meet the farming requirements of different crops. [0003] The Chinese utility model patent with the authorized announcement number CN202026579U discloses a mechanical double cylinder push-pull steering mechanism, which can be applied to agricultural vehicles to meet the requirements of variable wheelbase. The steering mechanism includes a hollow front axle, which is equipped with a Two front axle arms correspond to the two steering wheels, and the two front axle arms are telescopic to realize ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a hydraulic steering system to solve the problem that the Ackermann trapezoid corresponding to only one wheelbase formed by the four hinge points of the two steering cylinders in the prior art cannot meet the normal situation when the wheelbase increases. The technical problem of steering; meanwhile, the present invention also provides a vehicle with a variable wheel base using the above-mentioned hydraulic steering system

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