Patent ID: 6374972
Filing Date: 2002-04-23
Classification: B62K,B62M,F02B,F16H

Abstract:
A transmitting system for a small-sized vehicle having an engine and a multi-stage transmission comprising a crankshaft of said engine and an input shaft of said multi-stage transmission, said crankshaft being connected to said input shaft through a fluid transmitting means including a pump impeller and a turbine impeller, said pump impeller leading to said crankshaft and said turbine impeller leading to said input shaft, wherein the transmitting system includes a shifting clutch which is interposed between said crankshaft and said input shaft in a series relation to said fluid transmitting means; and wherein said shifting clutch comprises a multi-plate friction engagement means including a plurality of driving friction plates connected to an input side, and a plurality of driven friction plates laminated alternately with said driving friction plates and connected to an output side, a centrifugal mechanism which moves in response to an increase in rotational speed of the input side of a value equal to or higher than a predetermined value thereby to bring said multi-plate friction engagement means into an ON state, and a clutch turning-off mechanism which brings said multi-plate friction engagement means into an OFF state at the time of shifting of said multi-stage transmission even during operation of said centrifugal mechanism.