Cooling structure of power transmission device
There is provided a cooling structure of a power transmission device 1 that the power transmission device includes a tubular input shaft 3 and an output shaft 4 R that is inserted into and disposed inside the input shaft 3 , and that the power transmission device delivers power output from an electric motor (drive source) 2 to the input shaft 3 to the output shaft 4 R via a deceleration mechanism T and a differential device D, wherein the output shaft 4 R is disposed such that the output shaft 4 R is offset relative to a shaft center of the input shaft 3 in a radial direction, and an oil supply pipe 12 is disposed in an axial direction in a wide space that is formed on a side opposite to an offset side of the output shaft 4 R in a space S between the output shaft 4 R and the input shaft 3.
1. A cooling structure of a power transmission device that the power transmission device includes a tubular input shaft and an output shaft that is inserted into and disposed inside the input shaft, and that the power transmission device delivers power output from a drive source to the input shaft to the output shaft via a deceleration mechanism and a differential device,
wherein the output shaft is disposed such that the output shaft is offset relative to a shaft center of the input shaft in a radial direction, and an oil supply pipe is disposed in an axial direction in a wide space that is formed on a side opposite to an offset side of the output shaft in a space between the output shaft and the input shaft.
2. The cooling structure of a power transmission device according to claim 1 , wherein the drive source is an electric motor, and a rotor of the electric motor is cooled by oil ejected from the oil supply pipe.
3. The cooling structure of a power transmission device according to claim 2 , wherein a plurality of oil holes penetrating in the radial direction are formed in a peripheral direction in a vicinity of the input shaft where the vicinity of the input shaft is near an oil ejection port that opens at a tip end of the oil supply pipe, and a plurality of oil paths communicating with the oil holes are formed in the radial direction at the rotor of the electric motor.
4. The cooling structure of a power transmission device according to claim 3 , wherein a truncated cone-shaped guide groove expanding toward an inside in the radial direction in an inner periphery of the input shaft where the inner periphery of the input shaft is formed at a peripheral edge at the oil holes of the input shaft.