Grader front wheel drive control valve and hydraulic system

Abstract

The invention relates to grader front wheel drive and provides a grader front wheel drive hydraulic system in order to solve the problem that when front wheels of an existing grader are driven, unilateral slippage is likely to occur and affects the linear operation and the steering performance. The grader front wheel drive hydraulic system includes a grader front wheel drive control valve, whereina variable pump is connected with the P port of the grader front wheel drive control valve through a pipeline; the C1 port, D1 port, C2 port and D2 port of the grader front wheel drive control valveare correspondingly connected with the working ports of left and right front wheel hydraulic motors; the LS port is connected with a load feedback port of the variable pump; and the T port and the oilinlet port of the variable pump are connected with a hydraulic oil tank through pipelines. According to the hydraulic system, the left and right front wheels are separately controlled to avoid unilateral slippage, the linear operation and steering performance of graders can be ensured, different working condition modes can be selected according to the ground conditions of operation, the assistingeffect of the front wheels can be flexibly and effectively exerted, and the working efficiency and economical efficiency of the whole machine are improved.

Description

technical field [0001] The invention relates to a front wheel drive of a grader, more specifically, a control valve and a hydraulic system for the front wheel drive of a grader. Background technique [0002] The existing motor grader front wheel drive system is a front wheel power-assisted open hydraulic system with a drive pump and two motors. The drive pump absorbs oil from the hydraulic oil tank, and the outlet pressure oil is directly connected to the two parallel motors after passing through the control valve, and then through the control valve. An open hydraulic system back to the hydraulic tank. The flow of hydraulic oil entering the motor is determined by the opening of the spool of the three-position four-way reversing valve inside the control valve, and the pressure of the system is determined by the pressure cut-off valve of the driving pump. [0003] When the motor grader starts to work, the displacement of the drive pump is at the maximum displacement, and the ...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a front-wheel drive synchronous, The front wheel drive control valve with steering differential, oil return regeneration function, and different working condition adaptation modes can be selected according to the working ground conditions, which can flexibly and effectively play the role of front wheel power assist and improve the working efficiency and economy of the whole machine Motor grader front wheel drive control valve and hydraulic system

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