To provide a hydraulic drive device of a trave-type work machine capable of suppressing deterioration in workability during curved advancing regardless of a material of the portion of the traveling device in contact with the ground and the condition of the ground.SOLUTION: In a hydraulic drive device of a trave-type work machine, when a travel state is switched from a straight advancing state to a curved advancing state, a controller 70 maintains a motor capacity to a second capacity when a pump load is less than a first switching threshold, and switches the motor capacity from the second capacity to a first capacity when the pump load is equal to or higher than the first switching threshold. In a state where the motor capacity is set to the first capacity, when the travel state is the curved advancing state, the controller 70 maintains the motor capacity at the first capacity. When the travel state is switched from the curved advancing state to the straight advancing state, the controller 70 maintains the motor capacity to the first capacity when the pump load is equal to or higher than a second switching threshold, and switches the motor capacity from the first capacity to the second capacity when the pump load is less than the second switching threshold.SELECTED DRAWING: Figure 3

    【課題】走行装置における地盤に接する部分の材料及び地盤の状態にかかわらず曲進走行中の作業性が低下することを抑制できる走行式作業機械の油圧駆動装置を提供する。【解決手段】走行式作業機械の油圧駆動装置では、走行状態が直進状態から曲進状態に切り換えられた場合に、コントローラ70は、ポンプ負荷が第1切換閾値未満であるときにはモータ容量を第2容量に維持し、ポンプ負荷が第1切換閾値以上であるときにはモータ容量を第2容量から第1容量に切り換え、モータ容量が第1容量に設定された状態で走行状態が曲進状態である場合には、コントローラ70は、モータ容量を第1容量に維持し、走行状態が曲進状態から直進状態に切り換えられた場合に、コントローラ70は、ポンプ負荷が第2切換閾値以上であるときにはモータ容量を第1容量に維持し、ポンプ負荷が第2切換閾値未満であるときにはモータ容量を第1容量から第2容量に切り換える。【選択図】図3


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    Title :

    HYDRAULIC DRIVE DEVICE OF TRAVEL-TYPE WORK MACHINE


    Additional title:

    走行式作業機械の油圧駆動装置


    Contributors:

    Publication date :

    2023-05-24


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    E02F Baggern , DREDGING / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES



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