| 摘要 |
An accessory drive especially adapted for use with internal combustion engines having a crankshaft is described. The drive comprises a variable pulley transmission having a pair of spaced pulleys drivingly interconnected by a power transmission belt. The pulley transmission having a driver pulley drivingly connected to an engine crankshaft. The driven pulley includes a pair of pulley flanges, one flange is axially movable with respect to the other flange, the driven pulley also comprises a pair of pulley flanges, one of which is axially movable with respect to the other flange. The spacing of the flanges of the drive and driven pulleys determines the drive ratio between the pulleys. Another pulley is connected to the driven pulley, to drive the accessories. A drive pulley spring urges the drive pulley flanges axially toward one another, and a driven pulley spring urges the driven pulley flanges toward one another. An hydraulic piston, connected to the drive pulley movable flange and acted upon by engine lubricating oil, displaces the drive pulley movable flange with respect to its other flange. An hydraulic governor responsive to engine speed controls the supply of engine lubricating oil to the piston. A one-way clutch can be interposed between the accessory pulley and the drive shaft which permits the pulley to freewheel during upshifts.
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