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HYDRAULIC CIRCUIT FOR WORK VEHICLE
To provide a hydraulic circuit for work vehicle capable of preventing a shock due to a sudden drop in an oil amount generating when shifting from a single operation for driving one hydraulic actuator to a combined operation for driving a plurality of hydraulic actuators, with a low-cost structure.SOLUTION: A hydraulic circuit for work vehicle includes a first actuator 11, a second actuator 12, a hydraulic pump 13, a first direction switching valve 15, a second direction switching valve 16, a pilot pump 14, a first operation device 17, a second operation device 18, an electromagnetic type pressure reduction valve 19 for controlling a primary pressure of a pilot pressure oil supplied to the second operation device 18, and an ECU 10. While the first operation device 17 is operated, the ECU 10 transmits a first command for reducing the primary pressure from the reference pressure to a first command pressure and holding it with respect to the electromagnetic type pressure reduction valve 19, and when the second operation device 18 is operated from the state of the first operation device 17 being operated, transmits a second command for gradually increasing the primary pressure from the first command pressure to a second command pressure with respect to the electromagnetic type pressure reduction valve 19.SELECTED DRAWING: Figure 1
【課題】一つの油圧アクチュエータを駆動する単独動作から、複数の油圧アクチュエータを駆動する複合動作に移行する際に発生する油量の急激な低下によるショックを防止できる作業車両の油圧回路を安価な構成にて提供する。【解決手段】第１アクチュエータ１１、第２アクチュエータ１２、油圧ポンプ１３、第１方向切換弁１５、第２方向切換弁１６、パイロットポンプ１４、第１操作装置１７、第２操作装置１８、第２操作装置１８に供給されるパイロット圧油の１次圧力を制御する電磁式減圧弁１９、及びＥＣＵ１０を備え、ＥＣＵ１０は、第１操作装置１７が操作されている間は、電磁式減圧弁１９に対して１次圧力を基準圧から第１指令圧に減圧して保持する第１指令を発信し、第１操作装置１７が操作された状態から第２操作装置１８が操作されると、電磁式減圧弁１９に対して１次圧力を第１指令圧から第２指令圧に漸増させる第２指令を発信する。【選択図】図１
HYDRAULIC CIRCUIT FOR WORK VEHICLE
To provide a hydraulic circuit for work vehicle capable of preventing a shock due to a sudden drop in an oil amount generating when shifting from a single operation for driving one hydraulic actuator to a combined operation for driving a plurality of hydraulic actuators, with a low-cost structure.SOLUTION: A hydraulic circuit for work vehicle includes a first actuator 11, a second actuator 12, a hydraulic pump 13, a first direction switching valve 15, a second direction switching valve 16, a pilot pump 14, a first operation device 17, a second operation device 18, an electromagnetic type pressure reduction valve 19 for controlling a primary pressure of a pilot pressure oil supplied to the second operation device 18, and an ECU 10. While the first operation device 17 is operated, the ECU 10 transmits a first command for reducing the primary pressure from the reference pressure to a first command pressure and holding it with respect to the electromagnetic type pressure reduction valve 19, and when the second operation device 18 is operated from the state of the first operation device 17 being operated, transmits a second command for gradually increasing the primary pressure from the first command pressure to a second command pressure with respect to the electromagnetic type pressure reduction valve 19.SELECTED DRAWING: Figure 1
【課題】一つの油圧アクチュエータを駆動する単独動作から、複数の油圧アクチュエータを駆動する複合動作に移行する際に発生する油量の急激な低下によるショックを防止できる作業車両の油圧回路を安価な構成にて提供する。【解決手段】第１アクチュエータ１１、第２アクチュエータ１２、油圧ポンプ１３、第１方向切換弁１５、第２方向切換弁１６、パイロットポンプ１４、第１操作装置１７、第２操作装置１８、第２操作装置１８に供給されるパイロット圧油の１次圧力を制御する電磁式減圧弁１９、及びＥＣＵ１０を備え、ＥＣＵ１０は、第１操作装置１７が操作されている間は、電磁式減圧弁１９に対して１次圧力を基準圧から第１指令圧に減圧して保持する第１指令を発信し、第１操作装置１７が操作された状態から第２操作装置１８が操作されると、電磁式減圧弁１９に対して１次圧力を第１指令圧から第２指令圧に漸増させる第２指令を発信する。【選択図】図１
HYDRAULIC CIRCUIT FOR WORK VEHICLE
作業車両の油圧回路
MATSUYAMA HIROSHI (author) / SHIROMIZU TAKAYUKI (author) / AOYAMA KAZUHISA (author) / FUJIWARA TAKURO (author)
2019-10-10
Patent
Electronic Resource
Japanese
| European Patent Office | 2020