Steering system and method based on improved hydraulic steering bypass priority valve

Abstract

The invention discloses a steering system and method based on an improved hydraulic steering bypass priority valve. The improved hydraulic steering bypass priority valve is characterized in that the oil outlet end of a compensation valve is connected with a one-way valve A through a CF oil port and then connected with an oil inlet of a hydraulic steering gear, and the oil outlet end of the compensation valve is connected with a constant flow valve of a working device hydraulic multi-way valve through a one-way valve B; the oil outlet end of the compensation valve is connected with an oil inletof a variable pump through a one-way valve B, EF oil port, the oil outlet end of a priority valve is connected with a pressure compensator of the working device hydraulic multi-way valve through an EF oil port, and an LS overflow valve is integrated into the hydraulic steering bypass priority valve and connected with an LS port of the hydraulic steering gear. According to the improved hydraulic steering bypass priority valve, a compensation valve throttling groove and a priority throttling groove are independent of the compensation valve and the priority valve respectively, when different systems are matched, redesign or model selection is not needed, the universality of the improved hydraulic steering bypass priority valve is improved, the operation and maintenance cost is reduced, and production and machining are facilitated.

Description

technical field [0001] The present disclosure relates to the technical field of loaders, in particular to a steering system and method based on an improved hydraulic steering bypass priority valve. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] In the existing wheeled construction machinery, especially the wheel loader, higher requirements are put forward for the complex operation and low power consumption, which makes the combination of the LUDV hydraulic system with anti-flow saturation function and the hydraulic steering bypass priority valve The application will have a wide application space. In the current hydraulic steering bypass priority valve design, the compensation valve throttle groove and the priority throttle groove are mostly designed on the same valve stem, and the integration with the bypass priority valve spool makes i...

AI Technical Summary

Problems solved by technology

In the current hydraulic steering bypass priority valve design, the compensation valve throttle groove and the priority throttle groove are mostly designed on the same valve stem, and the integration with the bypass priority valve spool makes its structure more complicated, the cost increases, and it is not convenient for production and processing. , and it leads to the need to redesign and adjust the size of the two throttle grooves in the application of different construction machinery products to adapt to the load change, and it cannot be universalized; because there is a matching relationship between the compensation valve throttle groove and the priority throttle groove, when the matching is different It is necessary to redesign the throttle groove of the valve core during the system, which reduces its versatility and increases the operation and maintenance costs; because the throttle groove of the compensation valve and the priority throttle groove share the same spring, when the stiffness of the spring weakens during use, it will Seriously affect the performance of the bypass priority valve; the steering gear must be equipped with an Ls relief valve; due to the compact structure and limited space of the steering gear, the Ls relief valve increases its design and processing difficulty, failure rate, and maintenance difficulty; the Ls check valve is independent , increasing the leakage point and pipeline configuration, there is a possibility of reverse installation of the oil port; the control valve stem is in direct contact with the valve body, and there is a risk of scratching the valve body and valve stem when the oil cleanliness is insufficient, and it is difficult to repair after scratching

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