| 摘要 |
The invention relates to power transmission mechanisms for vehicles, and is particularly directed to an improved centrifugal clutch designed for use in tracked vehicles, such as snowmobiles. According to the invention a clutch is provided having a drive shaft, a first flange mounted on the shaft for rotation therewith, a second flange displaceable on the shaft, the first and second flanges having opposed tapering surfaces co-acting to form a V-belt groove, and spring means are provided for urging the flanges apart. The improvement comprises a flyweight support mounted on the shaft at an end remote from the first flange for rotation therewith. Flyweights are pivotally mounted to the support, for engagement with the first and second spaced apart bearing surface respectively on the second flange, the center of gravity of the flyweights being located such that at a predetermined r.p.m. of the shaft, the flyweights will co-act with the first bearing surface to cause the axial displacement of the second flange, and the initial engagement of the clutch. Upon subsequent increase of shaft r.p.m., the flyweights co-act with the second bearing surface, causing a second, substantially lesser and controllable increase in axial displacement of the second flange. The purpose of the invention is to enable the vehicle to give initial power delivery to the gear train at the optimum torque or horsepower as may be desired.
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