Full-toroidal continuously variable transmission

Details Full-toroidal continuously variable transmission Full-toroidal continuously variable transmission

2006-04-28

2011-10-11

Joyce, William C (Department: 3656)

Friction gear transmission systems or components

Condition responsive ratio change

Fluid control

C476S010000, C476S040000

Reexamination Certificate

active

08033952

ABSTRACT:
A full-toroidal continuously variable transmission has a hydraulic actuator (20) for applying pressing force to a pair of disks (5, 15) through a roller (17). The hydraulic actuator (20) includes first and second oil chambers (23, 24). The pressing force of the hydraulic actuator (20) is produced by a pressure difference between the oil chambers (23, 24). A directional control valve (29; 29P;29Q) connects a hydraulic pressure source (25; 25P;25Q) to either of the oil chambers, and an oil tank (26) is connected to the other oil chamber. Each corresponding an intermediate section (27a;27Pa,27Qa) of a feeding path (27, 27P,27Q) and intermediate section (28a;28Pa;28Qa) of a discharge path (28; 28P;28Q) are connected by a communicational path (32; 32P;32Q). A check valve (33; 33P;33Q) for permitting a flow of operation oil only to the feeding path side (27, 27P,27Q) is provided in the communication path (32; 32P;32Q). A flow restriction (34; 34P;34Q) is placed on a downstream side of the intermediate section (28a;28Pa;28Qa) of the discharge path (28; 28P;28Q).

REFERENCES:
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patent: 2002-174315 (2002-06-01), None
patent: 2003-130164 (2003-05-01), None
patent: 2004-278740 (2004-10-01), None
patent: WO-91/14116 (1991-09-01), None
patent: WO-2004/063602 (2004-07-01), None

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