To provide a hydraulic system capable of improving an energy saving effect by regenerating the power of an actuator.
In the hydraulic system, a first motor 32 drives a first hydraulic pump 33, and a boom cylinder 17 is driven by hydraulic fluid delivered from the first hydraulic pump 33. When the boom cylinder is driven in a tare direction and a third hydraulic pump 41 is not operating, a vehicle controller positions a first changeover valve 47 in a regenerating operating position S22, and a second changeover valve 48 in a regeneration operating position S32. Thereby, the hydraulic fluid output from the boom cylinder 17 is sequentially sent through the second changeover valve 48, a regeneration line 50, the first changeover valve 47, and the third hydraulic pump 41 and returned to a tank 8. At that time, an electric motor-cum-generator 40 functions as a generator, and electricity generated by the electric motor-cum-generator 40 is stored in a battery 22.
| JP2007097305A | 2007-04-12 | |||
| JP2008063888A | 2008-03-21 | |||
| JP2001016704A | 2001-01-19 | |||
| JP2000045955A | 2000-02-15 | |||
| JP2009174678A | 2009-08-06 | |||
| JP2003239902A | 2003-08-27 |
Mitsuo Tanaka
Yukinori Nakakura
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