Pump system and axle-driving system

摘要

There is provided a pump system (100) including a housing (110) capable of reserving oil in an internal space; an input shaft (210) supported by the housing so as to be operatively connected to a driving source (40); a pump shaft (310a,310b) supported by the housing; a hydraulic pump body (320a,320b) which is accommodated in the housing and is driven by the pump shaft; a PTO shaft (610) supported by the housing; a power transmission gear train (250) which transmits a power from the input shaft (210) to the pump shaft and the PTO shaft, and is accommodated in the housing; and a PTO clutch mechanism (650) accommodated in the housing so as to be positioned in a power transmission path from the input shaft to the PTO shaft. The power transmission gear train has at least two first and second transmission gears (251,252) meshed with each other. The housing has a narrow gear accommodating space surrounding a region including a mesh point between the first and second transmission gears, a PTO clutch accommodating space (110c) which surrounds the PTO clutch mechanism and which is fluidly communicated with the gear accommodating space (110b), and a pair of first and second suction/discharge ports which communicate the internal space of the housing with an outside of the housing. The first suction/discharge port is arranged within the gear accommodating space so as to be positioned in an opposite side to the PTO clutch accommodating space with the mesh point between the first and second transmission gears interposed therebetween.