Hydrostatic system, hydrostatic steering system and its hydrostatic pressure limiting oil supply device

Abstract

Disclosed are a hydrostatic system, a hydrostatic steering system and a hydrostatic pressure-limiting oil replenishing device thereof. The hydrostatic system comprises a plurality of hydrostatic hydraulic cylinders and the hydrostatic pressure-limiting oil replenishing device, the hydrostatic steering system comprises a steering signal cylinder, a steering actuation cylinder and the hydrostatic pressure-limiting oil replenishing device, the hydrostatic pressure-limiting oil replenishing device comprises a cylinder body, a piston component and an elastic component, the piston component is mounted in the cylinder body, the elastic component is used for balancing total pressure of hydrostatic chambers of the hydrostatic system and connected with the piston component, the piston component comprises multiple pistons and a piton rod, the piston rod is used for connecting the pistons, each piston divides an internal space of the cylinder body into a containing chamber and an oil storage chamber which are positioned on two sides of the piston, the containing chamber and the oil storage chamber between two adjacent pistons are spaced by a spacing sleeve, and the multiple oil storage chambers are communicated with the corresponding hydrostatic chambers of the hydrostatic system respectively. By the hydrostatic pressure-limiting oil replenishing device, operability and reliability of the hydrostatic system are improved greatly.

Description

technical field [0001] The present invention relates to a hydrostatic system, especially a hydrostatic system that can keep the pressure of the hydrostatic system stable, and solves the problem that the pressure of the hydrostatic system changes greatly due to the influence of ambient temperature and accidental overload. Hydrostatic system with frequent oil replenishment, hydrostatic steering system and its hydrostatic pressure limiting oil replenishment device. Background technique [0002] Large-scale multi-axle vehicles or trailers mostly use hydrostatic steering systems or use hydrostatic transmission of steering signals (or feedback signals), and hydrodynamic servo steering systems. In order to ensure the steering accuracy, the hydrostatic system should have a certain rigidity, so it is a closed circuit filled with oil pressure. [0003] The pressure of the hydrostatic system is greatly affected by changes in external temperature and accidental overload. The pressure c...

AI Technical Summary

Problems solved by technology

[0003] The pressure of the hydrostatic system is greatly affected by changes in external temperature and accidental overload. When the pressure is charged in hot weather, the oil pressure will be greatly reduced or even zero in the environment of sudden drop in temperature such as midnight or showers; Conversely, in an environment where the temperature rises suddenly, the oil pressure will rise sharply, if the oil pressure is not released in time, the system may be damaged

Even if it is used in an environment where the temperature does not change much, since the piston rod in the hydrostatic system will inevitably bring out the oil film during the working process, the oil pressure in the hydrostatic system will drop soon, and the hydrostatic system needs frequent cleaning. Oil replenishment, complex and cumbersome operation

[0004] In the prior art, one accumulator is often used in each of the two pipelines of the hydrostatic system, which can stabilize the oil pressure for a long time, but when the hydrostatic system is working, for example, when the hydrostatic system transmits signals or forces during steering, the pressure in one cavity will will rise, the oil will enter the accumulator, and the pressure in the other chamber will decrease, and the oil in the accumulator will be released, resulting in a large error in the transmission of the steering signal and an increase in the turning radius

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