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Hydraulic system of land leveller front-wheel drive

A front-wheel drive, hydraulic system technology, applied in fluid pressure actuation system components, mechanical equipment, earth movers/shovels, etc. The effect of avoiding tire idling

Active Publication Date: 2017-09-29
GUANGXI LIUGONG MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Because the pressure of the driving pump pressure cut-off valve is set, but the ground conditions will have local potholes, soft soil, dry and wet conditions, and the load of the working device is constantly changing. The tires of the motor grader are also in constant short-term changes. The valve keeps moving, causing the front wheel to slip briefly relative to the rear wheel, which cannot effectively play the role of the front wheel power assist, and the slip at this time not only causes tire wear, but also causes the whole machine to deviate or move sideways, which has serious consequences. Security risks

Method used

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  • Hydraulic system of land leveller front-wheel drive
  • Hydraulic system of land leveller front-wheel drive
  • Hydraulic system of land leveller front-wheel drive

Examples

Experimental program
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Embodiment Construction

[0024] The specific implementation will be described below in conjunction with the accompanying drawings.

[0025] Such as figure 1 As shown, the motor grader front wheel drive hydraulic system in this embodiment includes a combination pump, two front wheel hydraulic motors, two front wheel drive control valves, a fuel tank 10, a two-position three-way speed switching valve 4, and a back pressure valve 8. Accumulator 5, etc.

[0026] Such as image 3 As shown, the combined pump group includes two variable pump groups, charge oil pump 90, and charge oil relief valve 94; the two variable variable pump groups have the same structure, which are the left variable pump group and the right variable pump group respectively, and pass through a front variable pump group respectively. The wheel drive control valve is connected to a front wheel hydraulic motor. Wherein the left variable pump group includes a left variable pump 91, a left pump regulator 95 for controlling the flow of th...

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PUM

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Abstract

The invention relates to a land leveller front-wheel drive, and provides a hydraulic system of the land leveller front-wheel drive in order to overcome the defects of an existing land leveller front-wheel drive. The hydraulic system comprises two variable pump groups, two front-wheel hydraulic motors, two front-wheel drive control valves, an oil supplementing pump, an oil tank, a two-position three-way speed switching valve and a counterbalance valve; each front-wheel drive control valve comprises a three-position four-way reversing valve and a two-position five-way reversing valve, two working oil ports of each variable pump group are correspondingly connected with one front-wheel drive control valve, and an A oil port and a B oil port of each front-wheel drive control valve are correspondingly connected with an A oil port and an R oil port of the corresponding front-wheel hydraulic motor.

Description

technical field [0001] The invention relates to a front-wheel drive of a grader, and more specifically relates to a front-wheel drive hydraulic system of a grader. Background technique [0002] The existing motor grader front wheel power hydraulic system is a front wheel power open hydraulic system with a drive pump and two motors. The drive pump sucks 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 controlled An open hydraulic system in which the valve returns 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 pressure ...

Claims

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Application Information

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IPC IPC(8): F15B21/00F15B13/08F15B1/02F15B21/04E02F9/22
CPCE02F9/2253E02F9/2267E02F9/2289E02F9/2292F15B1/02F15B13/0807F15B21/001F15B21/041F15B2211/20553F15B2211/20576F15B2211/30525F15B2211/31523
Inventor 李良周刘光喜白健信
Owner GUANGXI LIUGONG MASCH CO LTD