Closed hydraulic control system for travelling mechanism of construction vehicle

Abstract

The invention discloses a closed hydraulic control system for a travelling mechanism of a construction vehicle. The system comprises a hydraulic pump and a hydraulic motor, wherein the hydraulic pump is a variable hydraulic pump, and while the hydraulic motor is a variable motor which is connected in series with the variable hydraulic pump; a first one-way overflowing valve and a second one-way overflowing valve which are oppositely arranged are connected in series between two liquid outlets of the variable hydraulic pump; two liquid outlets of the variable hydraulic pump are respectively communicated with a first working oil port and a second working oil port of a control valve; a third working oil port of the control valve is connected with an inlet of a pilot type overflowing valve; an outlet of the pilot type overflowing valve is communicated with an oil tank. The system has the characteristics that the closed system is adopted, the structure is simple and compact, the speed governing and braking are relatively smooth, the impact is reduced, the service life is long, the power utilization rate is raised, the energy consumption is lowered down, the arrangement is convenient, the cost is reduced, and the popularization and use are convenient.

Description

technical field [0001] The invention belongs to the technical field of engineering machinery, and relates to a hydraulic control system, in particular to a closed hydraulic control system of a traveling mechanism of an engineering vehicle. Background technique [0002] Hydraulic transmission and control use liquid (oil, high water-based hydraulic oil, synthetic liquid) as the medium to realize the output of various mechanical quantities (force, displacement or speed, etc.). Compared with pure mechanical transmission, electric transmission and pneumatic transmission, it has the characteristics of large transmission power, small structure and fast response, so it is widely used in various mechanical equipment and precise automatic control systems. [0003] In the second half of the 20th century, with the development of hydraulic technology, hydraulic technology was introduced to construction vehicles, and the control of construction vehicles was simpler, labor-saving and more ...

AI Technical Summary

Problems solved by technology

Most of the hydraulic systems used in the running mechanism of engineering vehicles in my country are open hydraulic systems. There is a certain rigid impact in the process of starting, reversing and braking in the open hydraulic system, and the energy loss is relatively large, and the power utilization rate is low. In addition, the synchronization of the running mechanism of engineering vehicles needs to be controlled by various control elements in the system, and the differences in the manufacturing accuracy and anti-interference ability of each control element make it difficult to control the synchronization of the running mechanism of engineering vehicles

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