Suspension valve, oil gas suspension system and engineering vehicle

Abstract

The invention relates to a suspension valve comprising an oil intake switch lockup valve (22), an oil return switch lockup valve (21) and a differential-pressure sensing logic control element group. The differential-pressure sensing logic control element group comprises a logic shutter valve (23), a differential-pressure sensing lockup valve (24) and a pilot control valve (25), wherein the oil return switch lockup valve realizes the start and lockup functions of return oil; the oil intake switch lockup valve realizes the start and lockup functions of intake oil; the logic shutter valve realizes the logic comparison of pressures of a rod cavity and a rodless cavity of a suspension oil cylinder; and the differential-pressure sensing lockup valve realizes the differential-pressure sensing and the communication lockup of the pressures of the rod cavity and the rodless cavity of the suspension oil cylinder. In addition, the invention also provides an oil gas suspension system adopting the suspension valve and an engineering vehicle thereof. By applying the differential-pressure sensing logical control element group, the durable maintenance and the reliable and rapid conversion of rigidand flexible working conditions of the suspension system are realized more reliably, elements of the suspension valve of an axle suspension system are effectively reduced, and the control is simple and convenient.

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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