Friction gear transmission systems or components – Fluid control – Of toroidal transmission
Reexamination Certificate
2008-01-15
2008-01-15
Fenstermacher, David M. (Department: 3682)
Friction gear transmission systems or components
Fluid control
Of toroidal transmission
C476S002000, C476S040000
Reexamination Certificate
active
07318786
ABSTRACT:
A variator assembly comprising a variator of the toroidal-race rolling-traction type. The assembly has input and output discs and rollers which are acted on by hydraulic roller control actuators. They are positioned between the discs to transmit torque from one disc to the other. Hydraulic end loading means supplied with fluid at an end load pressure to apply an end load to bias the discs and the rollers toward each other, thereby enabling the transmission of torque. Reaction pressure supply means are connected to the roller control actuators to cause them to apply an adjustable reaction force to the rollers. The assembly also has hydraulically influenced valve means which serve to compare an input related to the end load pressure with an input related to the reaction pressure and to control the end load pressure in dependence upon the comparison, thereby maintaining a relationship between the end load and reaction pressures. Adjustment means are provided to adjust the relationship between the end load and reaction pressures.
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International Preliminary Examination Report, PCT/GB02/01551, Oct. 24, 2002.
International Search Report, PCT/GB 02/01551, Aug. 8, 2002.
Fuller John William Edward
Greenwood Christopher John
Brooks & Kushman P.C.
Fenstermacher David M.
Torotrak (Development) Limited
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