Friction gear transmission systems or components – Fluid control – Of toroidal transmission
Patent
1999-06-01
2000-12-19
Fenstermacher, David
Friction gear transmission systems or components
Fluid control
Of toroidal transmission
475216, F16H 6130
Patent
active
061621447
ABSTRACT:
A continuously variable toric transmission has rollers which engage semi-toroidal disc members to establish a drive relation therebetween. The annular disposition of the rollers relative to the toroidal members determines the speed relationship between the toroidal members. The rollers are urged into a space between the discs by one force and the discs are urged together by another force. Thus, the discs have a normal force and a traction force, the ratio of which is equal to the coefficient of traction. Controlling the ratio of the traction force to the normal force controls the coefficient of traction within a predetermined range of values. The traction force is affected by a controlled pressure differential across a piston which forces the rollers into the space between the discs, and a pressure urging the discs toward each other affects the normal force. By controlling these pressures, the coefficient of traction is controllable.
REFERENCES:
patent: 4911030 (1990-03-01), Kraus
patent: 5607372 (1997-03-01), Lohr
Fenstermacher David
General Motors Corporation
Hargitt Laura C.
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