Abstract: A power transfer device includes a casing, a lubricant reservoir in the casing having lubricant therein, and a shaft rotatably supported in the casing. The shaft extends into the lubricant reservoir. A lubricant driving structure is coupled to the shaft for common rotation. The lubricant driving structure includes at least one helically shaped member that extends longitudinally along and circumferentially about the shaft. The at least one helically shaped member is located in the lubricant reservoir. Rotation of the at least one helically shaped member drives the lubricant axially along the shaft and away from the lubricant reservoir. According to other features, an oil propeller wheel is mounted around a shaft in the power transfer device for rotation therewith. The oil propeller wheel communicates with the lubrication in the lubricant reservoir and is operable to direct the lubricant from the lubricant reservoir axially along the shaft toward the differential assembly.

Abstract: The two-speed transmission (10) for driving an alternator or other engine accessory includes an enclosed gear case (12). An output shaft (28) passes through both ends of the gear case. Bearings (30, 32) supported on the gear case support the ends of the output shaft. A tubular input shaft (64) surrounds the output shaft and is journaled on the output shaft between the two output shaft support bearings. A planet gear carrier (86) is rotatably journaled on the output shaft inside the gear case. Compound planet gears (112) are rotatably supported by the planet gear carrier (86) with one planet (116) of each compound planet gear in mesh with a sun gear (84) on the tubular input shaft (64) and with a planet (118) of each compound planet gear in mesh with a sun gear (94) on the output shaft (28). A brake assembly (124, 136 and 142) is either applied to lock the planet gear carrier (86) to the gear case or is released to let the planet carrier rotate in the gear case.