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Grader front wheel drive control valve and hydraulic system

A front-wheel drive and hydraulic system technology, which is applied to control devices, mechanical equipment, earth movers/shovels, etc., can solve the problems of short service life of motors and unilateral slipping of motors, and achieve extended service life and oil supply Timely, the effect of improving operation efficiency and economy

Inactive Publication Date: 2019-02-19
GUANGXI LIUGONG MASCH CO LTD
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  • Abstract
  • Description
  • Claims
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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

Method used

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  • Grader front wheel drive control valve and hydraulic system
  • Grader front wheel drive control valve and hydraulic system
  • Grader front wheel drive control valve and hydraulic system

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Embodiment Construction

[0028] The specific implementation will be described below in conjunction with the accompanying drawings.

[0029] Such as figure 1 , Figure 4As shown, the hydraulic system for driving the front wheels of the grader in this embodiment includes a hydraulic oil tank 1, a drive pump 2, a working mode selection valve 3, a control valve for driving the front wheels of the grader 4, a left front wheel hydraulic motor 5, and a right front wheel Hydraulic motor 6, controller 7, rear wheel speed sensor 8, working mode input device 9, steering sensing device 10, engine speed sensor 11, working mode input device 12.

[0030] Such as figure 2 , image 3 As shown, the motor grader front wheel drive control valve 4 includes a left front wheel reversing valve 401, a right front wheel reversing valve 402, a left compensation valve 403, a right compensation valve 404, a main safety valve 405, a pressure reducing valve 406, a mode switching solenoid valve 407, Shuttle valve 408, two-way d...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/16E02F3/85B60K17/356
Inventor 刘光喜李良周白健信李大尤农棉庚
Owner GUANGXI LIUGONG MASCH CO LTD
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