Walking shunting system of wheel type hydraulic excavator: Fid-Bau Portal

Walking shunting system of wheel type hydraulic excavator

CHEN DAIHONG / TANG FA / LI LIN

A walking shunting system of a wheel type hydraulic excavator comprises a walking reversing valve and a walking motor. The hydraulic oil tank is connected to the hydraulic pump through an oil pipe; the outlet end of the hydraulic pump is connected to the walking reversing valve through an oil inlet pipe; the walking reversing valve is connected to the hydraulic oil tank through an oil return pipe; the walking motor is connected with the walking reversing valve through a connecting pipe; the device further comprises a walking diverter valve. When the walking reversing valve is switched to a forward position and the walking diverter valve is in an open state, pressure oil pumped out of the hydraulic pump is supplied to the walking motor from two oil ways of the walking reversing valve and the walking diverter valve; return oil of the walking motor flows back to the hydraulic oil tank from two oil ways of the walking reversing valve and the walking diverter valve. The walking diverter valve and the walking reversing valve in the main control valve are connected in parallel for use, so that the hydraulic oil flow capacity of a walking system is improved, the pressure loss of hydraulic oil in the main control valve is reduced, the running speed of a vehicle reaches an expected target, and the energy loss can be reduced to an acceptable range.

一种轮式液压挖掘机行走分流系统，包括行走换向阀和行走马达；液压油箱通过油管连接至液压泵，液压泵的出口端经过进油管连接至行走换向阀；且行走换向阀通过回油管连接至液压油箱；行走马达与行走换向阀之间通过连接管连接；还包括行走分流阀；当行走换向阀切换到前进位置和行走分流阀处于开启状态时，从液压泵泵出的压力油从行走换向阀和行走分流阀两路油路共同为行走马达供油；行走马达的回油从行走换向阀和行走分流阀两路油路回流至液压油箱。通过增加行走分流阀与主控制阀中的行走换向阀并联使用加大行走系统的液压油通流能力，降低液压油在主控制阀中的压力损失，使车辆行驶速度即达到预期目标，能量损失又能降到可接受的范围。

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