Patent ID: 8215927

Claim:
A fluid pressure pump unit, comprising: a fluid pressure pump which pressurizes a hydraulic fluid; a motor which has an output shaft and drives the fluid pressure pump; a cooling fan which is connected to the output shaft of the motor and generates a flow of cooling air to cool the motor; a radiator which receives heat from the hydraulic fluid, wherein the motor and the radiator are overlapped at least partially with the cooling fan, when viewed from an axial direction of the output shaft of the motor; the radiator is disposed between the cooling fan and the motor; the fluid pressure pump is disposed at the opposite side of the radiator across the motor; a passage for the hydraulic fluid pressure pump and a passage for the hydraulic fluid in the radiator are in communication with each other through a communication passage formed in a housing of the motor; the housing of the motor includes a first housing and a second housing fitted at the outside of the first housing; and at least a part of the communication passage includes a groove as its constituting element, the groove being formed on one of an outer circumferential surface of the first housing and an inner circumferential surface of the second housing.