Patent ID: 8167078
Filing Date: 2012-05-01
Classification: B60K,B60Y,B66F,E02F,Y02T

Abstract:
1. A work vehicle having a traveling portion that performs traveling and a work portion that performs work using fluid pressure, comprising: an engine connected to an engine output shaft via a first one-way clutch; a traveling drive portion having a transmission connected to the engine output shaft and a traveling drive shaft which is rotated by the transmission and which moves the traveling portion; a work drive portion having a work drive shaft which is gear-coupled to an engine output shaft gear fixed to the engine output shaft and the work portion driven by the work drive shaft; a switching valve provided in the work drive portion which selects whether to supply fluid to the work portion or to a tank; a first motor/generator connected to the work drive shaft and driven by a battery; a work regeneration portion transmitting regenerative energy of the work drive portion to the engine output shaft gear via a second one-way clutch; and a second motor/generator which is gear-coupled to the traveling drive shaft and driven by the battery, wherein the switching valve selects to supply fluid to the tank when the first motor/generator drives the engine output shaft via the work drive shaft, and when the work is not to be performed by the work portion, and wherein the first one-way clutch transmits an output of the engine to the engine output shaft when a rotational frequency of the engine becomes higher than a rotational frequency of the engine output shaft.