Driving pulley for a continuously variable transmission

Details Driving pulley for a continuously variable transmission Driving pulley for a continuously variable transmission

2006-06-20

2006-06-20

Charles, Marcus (Department: 3682)

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Speed responsive

C474S019000, C474S021000, C474S017000

Reexamination Certificate

active

07063633

ABSTRACT:
The driving pulley comprises two centrifugal mechanisms, namely a positive assembly and a negative assembly. Both assemblies comprise a respective set of flyweights subjected to the centrifugal force when the driving pulley rotates. The positive assembly is used as a conventional speed governor that moves one of the two flanges of the driving pulley towards the other in order to increase its winding diameter when the rotation speed increases. The negative assembly is used to apply an opposite force on the positive assembly when the rotation speed is above a threshold value so as to defer the upshift of the CVT to a higher ratio under the action of the positive assembly. This allows to maintain, for instance, a high rotation speed during an intense acceleration and a lower rotation speed when cruising at low vehicle speeds.

REFERENCES:
patent: 2422196 (1947-06-01), Heyer
patent: 2496201 (1950-01-01), Dodge
patent: 2987934 (1961-06-01), Thomas
patent: 3395587 (1968-08-01), Casini
patent: 4515575 (1985-05-01), Kinbara et al.
patent: 4634405 (1987-01-01), Miranti, Jr. et al.
patent: 5172786 (1992-12-01), Ishibashi et al.
patent: 5514040 (1996-05-01), Robert
patent: 6086492 (2000-07-01), Nakagaki et al.

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