Power transfer device for four-wheel drive.

摘要

A power transfer device adapted for use in combination with a power transmission. The transfer device includes a housing 20, an input shaft 21 rotatably mounted within the housing for drive connection to an output shaft 13 of the transmission, an output shaft 22 rotatably mounted within the housing for rotation relative to the input shaft, a planetary gear unit 30 arranged within the housing and having an input element 31 mounted on the input shaft for rotation therewith and an output element 35 connectable to the output shaft, and a sleeve member 41 axially slidably mounted on the output shaft and shiftable between a first position in which it effects a drive connection between the input and output shafts and a second position in which it effects a drive connection between the output element of the gear unit and the output shaft. A bearing retainer 20c is secured to the housing to retain a bearing 91 carried on the housing for supporting thereon the input shaft, and an oil pump assembly 80 is contained within a cavity of the bearing retainer and mounted on the input shaft at the outside of the housing to be driven by rotation of the input shaft. The pump assembly is arranged to pump up lubricating oil stored in the housing and supply it into an axial bore 21c in the input shaft.