Suspension valve, oil gas suspension system and engineering vehicle

Abstract

Disclosed is a suspension valve, which comprises an oil inlet switch lock-up valve (22), an oil return switch lock-up valve (21) and differential pressure sensing and logic control units. The differential pressure sensing and logic control units include a logic shuttle valve (23), a differential pressure sensing and locking valve (24) and a guide control valve (25). The oil return switch lock-up valve (21) can open and lock the oil return path, and the oil inlet switch lock-up valve (22) can open and lock the oil inlet path. The logic shuttle valve (23) compares the pressure logics between a rod side chamber of a suspension oil cylinder and a rodless chamber of the suspension oil cylinder. The differential pressure sensing and locking valve (24) senses the differential pressure between the rod side chamber of the suspension oil cylinder and the rodless chamber of the suspension oil cylinder, as well as connects and locks the two chambers. Besides, an oil-gas suspension system and an engineering vehicle adopting said suspension valve are also disclosed. By employing the differential pressure sensing and logic control units, the invention more reliably enables long-time maintaining of both a rigid mode and a flexible mode of the suspension system, realizes a quick and reliable conversion between the rigid mode and the flexible mode, effectively reduces the number of units in the suspension valve of the axle suspension system, thus achieving an easy and convenient control.

Description

technical field [0001] The invention relates to a suspension valve. In addition, the present invention also relates to an oil-pneumatic suspension system and an engineering vehicle including the suspension valve. Background technique [0002] Hydro-pneumatic suspension systems are widely used in various mobile construction machinery, such as wheeled loading and unloading trucks, mine dump trucks, wheeled excavators and mobile cranes. [0003] The existing oil-pneumatic suspension system is mainly realized by the combination of suspension cylinder and accumulator, the combination of suspension cylinder and accumulator plus suspension valve, and various manufacturers basically adopt the combination of suspension cylinder and accumulator plus suspension valve. . see figure 1 , wherein the two sides of each axle A are symmetrically provided with suspension oil cylinders 7, 10, the upper ends of the suspension oil cylinders 7, 10 are hinged on the frame F or the vehicle body, ...

AI Technical Summary

Problems solved by technology

[0005] However, this existing oil-pneumatic suspension technology uses a two-position two-way valve to perform rigid-flexible conversion, which is affected by the suspension oil cylinder. In the rigid state, the suspension system cannot be effectively locked. The above-mentioned two-position two-way valve directly bears the vehicle pressure, because the two-position two-way valve bears relatively large hydraulic pressure and air pressure, when the air pressure changes, there is a possibility of automatically converting flexibility to rigidity

In addition, the suspension valve gives priority to raising the suspension, which makes the logic relationship of the suspension valve complex, and the number of hydraulic components must be increased to realize the lifting function, which also increases the difficulty of logic control

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