| 摘要 |
The invention concerns a transmission device ( 12 ) mounted between a supercharger compressor ( 7 ) and a pulley ( 11 ) designed to drive same from the vehicle motor. The device comprises two successive modules ( 16, 46 ) each capable of a direct engagement ratio through a free wheel ( 31, 61 ), or of an overdrive ratio by locking the planet gear ( 21, 51 ) by means of a clutch ( 26, 56 ) clamped by a spring ( 28 ) or released by the action of centrifugal counter-weights ( 32, 62 ) whereof the action is at least compensated by the axial thrust of the teeth F<SUB>p </SUB>produced by the planet gear ( 21, 52 ) when it is loaded. The invention is useful for independently regulating the rotational speed of the apparatus ( 7 ) notwithstanding the speed variations of the pulley ( 11 ). |
