A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
HYDRAULIC TRANSMISSION FOR CONSTRUCTION MACHINE
PROBLEM TO BE SOLVED: To provide a hydraulic transmission machine for a construction machine enabling requisite amount of hydraulic fluid to be assured to a front cylinder when a vehicle body fits in mud and cannot escape out of it only under a travel operation, enabling an output reduction at the front cylinder to be prevented, and enabling a front working machine to be operated to cause the vehicle body to escape out of mud rapidly.SOLUTION: A second changeover valve 200 holds a first changeover valve 100 at its open position when running operation devices 34a, 34b are not operated and when the running operation devices are operated and a main pump 2 is not under a high load operation for operating a main relief valve 23, the first changeover valve is changed over to a metering position and in turn when the running operation device is operated and the main pump is under a high load operation state in which the main pump operates the main relief valve, the first changeover valve is changed over to the open position.SELECTED DRAWING: Figure 1
【課題】車体がぬかるみにはまって走行操作のみでは脱出できない場合に、フロントシリンダへの必要な量の圧油を確保してフロントシリンダの出力低下を防ぐことにより、フロント作業機を操作して車体をぬかるみから速やかに脱出させることを可能とする建設機械の油圧駆動装置を提供する。【解決手段】第２切換弁２００は、走行操作装置３４ａ，３４ｂが操作されていないときは第１切換弁１００を開位置に保持し、前記走行操作装置が操作されかつメインポンプ２がメインリリーフ弁２３を作動させる高負荷運転状態にないときは前記第１切換弁を絞り位置に切り換え、前記走行操作装置が操作されかつ前記メインポンプが前記メインリリーフ弁を作動させる高負荷運転状態にあるときは前記第１切換弁を前記開位置に切り換える。【選択図】 図１
HYDRAULIC TRANSMISSION FOR CONSTRUCTION MACHINE
PROBLEM TO BE SOLVED: To provide a hydraulic transmission machine for a construction machine enabling requisite amount of hydraulic fluid to be assured to a front cylinder when a vehicle body fits in mud and cannot escape out of it only under a travel operation, enabling an output reduction at the front cylinder to be prevented, and enabling a front working machine to be operated to cause the vehicle body to escape out of mud rapidly.SOLUTION: A second changeover valve 200 holds a first changeover valve 100 at its open position when running operation devices 34a, 34b are not operated and when the running operation devices are operated and a main pump 2 is not under a high load operation for operating a main relief valve 23, the first changeover valve is changed over to a metering position and in turn when the running operation device is operated and the main pump is under a high load operation state in which the main pump operates the main relief valve, the first changeover valve is changed over to the open position.SELECTED DRAWING: Figure 1
【課題】車体がぬかるみにはまって走行操作のみでは脱出できない場合に、フロントシリンダへの必要な量の圧油を確保してフロントシリンダの出力低下を防ぐことにより、フロント作業機を操作して車体をぬかるみから速やかに脱出させることを可能とする建設機械の油圧駆動装置を提供する。【解決手段】第２切換弁２００は、走行操作装置３４ａ，３４ｂが操作されていないときは第１切換弁１００を開位置に保持し、前記走行操作装置が操作されかつメインポンプ２がメインリリーフ弁２３を作動させる高負荷運転状態にないときは前記第１切換弁を絞り位置に切り換え、前記走行操作装置が操作されかつ前記メインポンプが前記メインリリーフ弁を作動させる高負荷運転状態にあるときは前記第１切換弁を前記開位置に切り換える。【選択図】 図１
HYDRAULIC TRANSMISSION FOR CONSTRUCTION MACHINE
建設機械の油圧駆動装置
TAKEBAYASHI KEIFUMI (author) / YOSHIDA HAJIME (author) / MORI KAZUSHIGE (author) / NAKAMURA NATSUKI (author) / MAEHARA TAHEI (author)
2018-04-05
Patent
Electronic Resource
Japanese