PROBLEM TO BE SOLVED: To reduce loss horsepower by installing a low-pressure hydraulic pump.SOLUTION: A hydraulic system for a work vehicle includes: a high-pressure type hydraulic pump 30 for pressure-feeding a hydraulic fluid to a hydraulic actuator such as hydraulic cylinders 13, 38 and hydraulic clutches 47, 53, 54, 55 and the low-pressure type hydraulic pump for feeding a lubricant to a tooth meshing part and a sliding part of a power transmission system. In the hydraulic system, a pump shaft 30a of the high-pressure type hydraulic pump 30 is connected to an engine 3 so as to be driven by the engine and a pump shaft of the low-pressure type hydraulic pump is connected to an electric motor 62 so as to be driven by the electric motor.COPYRIGHT: (C)2015,JPO&INPIT【課題】低圧の油圧ポンプを設けてロス馬力を軽減できるようにする。【解決手段】油圧シリンダ13・38や油圧クラッチ47・53・54・55等の油圧アクチュエータに作動油を圧送する高圧型の油圧ポンプ30と、動力伝達系の歯合部や摺動部へ潤滑油を送油する低圧型の油圧ポンプとを備える作業車両の油圧装置であって、高圧型の油圧ポンプ30のポンプ軸30aはエンジン3に接続して駆動されるとともに、低圧型の油圧ポンプのポンプ軸は電動モータ62に接続されて駆動する。【選択図】図3
