Patent ID: 8500590
Filing Date: 2013-08-06
Classification: F02N,F16H

Abstract:
1. In an accessory drive system of a motor vehicle having a starter motor/generator, an accessory drive pulley connected to an internal combustion engine crankshaft during at least one mode of operation, and an endless loop power transmission member connecting at least the starter motor/generator and the accessory drive pulley, the improvement comprising: a planetary gear power transmission having a sun gear interacting with a planetary gear carrier connect to the engine crankshaft, the planetary gear carrier supporting a plurality of planetary gears, each gear having a central axis and wherein, during at least one mode of operation, the axis of the planetary gears follows a path extending around the axis of the sun gear, and a ring gear integrally associated with the accessory drive pulley and interacting with the plurality of planetary gears; first and second one way clutches unidirectionally connecting the engine crankshaft to the ring gear, and the sun gear to a grounding member, respectively, to define two modes of operation corresponding to a normal drive mode, and an engine start mode, respectively; and an electromagnetic disconnect including a normally closed friction clutch connecting the grounding member to ground to define a third mode of operation corresponding to a free wheel mode with the grounding member disengaged from connection to ground allowing the accessory drive pulley to be driven by the starter motor/generator with the first one way clutch overrunning, the second one way clutch engaged, and the normally closed friction clutch electromagnetically driven open allowing the grounding member to freely rotate.