Patent ID: 8727088

Claim:
A work vehicle comprising: an engine; a transmission coupled to the engine; and a hydraulic pump, wherein the transmission includes an input member to which power from the engine is inputted, a transmission body having a cylindrical input shaft, a torque converter body coupled to the input member to transmit power from the input member through a fluid to the input shaft, a lock-up clutch device having a piston that operates by hydraulic pressure, an oil chamber formed at a back surface of the piston, and a clutch portion configured to transmit power from the input member to the input shaft by operation of the piston, a pump drive shaft penetrating inside of the input shaft and disposed coaxially with the input shaft, the pump drive shaft being configured to transmit driving power to the hydraulic pump, and an oil channel formed between an inner circumference surface of the input shaft and an outer circumference surface of the pump drive shaft, and communicating with the oil chamber of the lock-up clutch device, wherein a tip portion of the pump drive shaft extends to project from an end surface of the input shaft to the engine side, and the input member includes a coupling hole disposed in a center portion and coupled with the tip portion of the pump drive shaft, a fitting hole disposed coaxially with the coupling hole, and having a larger diameter than the coupling hole to fit with an outer circumference surface of a tip portion of the input shaft, an oil reservoir portion formed by an inner circumference surface of the fitting hole, a tip surface of the input shaft, and the outer circumference surface of the pump drive shaft, and communicating with the oil channel, and a communicating hole allowing communication between the oil reservoir portion and the oil chamber of the lock-up clutch device.