To provide a power transmission for a four-wheel drive vehicle with a hydraulic coupling device wherein sealing between a shaft hole of a casing and a rotor shaft passing through the shaft hole is performed with simple machining.
A circular seal groove 27a is formed on the outer periphery face of the rotor shaft 27 for supporting a rotor 35 for a vane pump P. Sealing is performed by abutting a sealing member 37 to be fitted to the seal groove 27a to the inner periphery face of the shaft hole 22a of the casing 22. Since the seal groove 27a is formed on the outer periphery face of the rotor shaft 27, the need for applying troublesome boring to the inner periphery face of the shaft hole 22a of the casing 22 to form the seal groove is eliminated, resulting in a reduction in number of machining processes.
MABUCHI TORU
MIYATA KAZUNORI
KUROKAWA TAKUYA
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