To secure straight moving performance and turning travel performance of a construction machine.SOLUTION: A direction selector valve has a pump port connected to a pump, a first compensation port connected to an upstream side of a corresponding pressure compensation valve, a second compensation port connected to a downstream side of the corresponding pressure compensation valve, a pair of feed/discharge ports connected to a corresponding travel motor, and a communication port. Communication ports of right and left direction selector valves are connected to each other through a communication line. When a travel operation unit is operated and a spool moves from a neutral position, the pump port communicates with the first compensation port and the second compensation port communicates with one of the feed/discharge ports and the communication port. The direction on/off valve is so configured that as a movement quantity of the spool from the neutral position is larger, a degree of communication between the second compensation port and the communication port is larger.SELECTED DRAWING: Figure 2

    【課題】 建設機械の直進性能も旋回走行性能も確保する。【解決手段】 方向切換弁は、ポンプと接続されるポンプポート、対応する圧力補償弁の上流側と接続される第1補償ポート、対応する圧力補償弁の下流側と接続される第2補償ポート、対応する走行モータと接続される一対の給排ポート、および連通ポートを有する。左右の方向切換弁の連通ポート同士が連通ラインを介して接続される。走行操作器が操作されてスプールが中立位置から移動すると、ポンプポートが第1補償ポートと連通し、かつ、第2補償ポートが給排ポートの一方および連通ポートと連通する。方向切換弁は、スプールの中立位置からの移動量が大きいほど第2補償ポートと連通ポートとの連通度合が大きくなるよう構成される。【選択図】図2


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    Title :

    HYDRAULIC PRESSURE CIRCUIT OF CONSTRUCTION MACHINE


    Additional title:

    建設機械の油圧回路


    Contributors:

    Publication date :

    2020-02-20


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein / B62D MOTOR VEHICLES , Motorfahrzeuge / E02F Baggern , DREDGING



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