US Patent 7775151 Hydraulic lift structure

In a hydraulic lift structure formed by arranging a hydraulic cylinder case internally provided with a hydraulic cylinder for moving up and down a working machine (a rotary power tiller) in an upper portion of a transmission case of a working vehicle, an oil reservoir of a working fluid for the hydraulic cylinder is provided in a boundary portion between the transmission case and the hydraulic cylinder case in such a manner as to be isolated from an inner portion of the transmission case. The hydraulic lift structure which prevents a malfunction of a hydraulic cylinder or the like and improves a supplying and discharging efficiency of a working fluid.