Toroidal type continuously variable transmission

Details Toroidal type continuously variable transmission Toroidal type continuously variable transmission

1998-02-03

2000-09-05

Bucci, David A.

Friction gear transmission systems or components

Fluid control

Of toroidal transmission

476 40, F16H 1538

Patent

active

061135135

ABSTRACT:
A toroidal type continuously variable transmission improves transmission efficiency. The thrust loads applied to first and second ball-and-roller bearings as a pressing device is actuated are reduced, and the rotational torques of these two ball-and-roller bearings are decreased so as to achieve higher transmission efficiency. When the pressing device is actuated, the inner rings of the first and second ball-and-roller bearings are subjected to thrust loads which act on them to move them toward each other. The thrust loads are reduced by pushing the inner rings in such directions as to move them away from each other by first and second pistons constituting first and second hydraulic cylinders, respectively. Further, a hydraulic force generator is provided between the output bearing and the input bearing; it produces a hydraulic force acting in the opposite direction from that of the reaction force applied to the outer rings of an output bearing and an input bearing, respectively, so as to reduce the thrust loads on the output bearing and the input bearing. A high-pressure oil employed in the hydraulic circuit for speed change control is introduced to the hydraulic force generator.

REFERENCES:
patent: 3163050 (1964-12-01), Kraus
patent: 3280646 (1966-10-01), Lemieux
patent: 4272999 (1981-06-01), Perry
patent: 4570501 (1986-02-01), Perry
patent: 4955246 (1990-09-01), Nakano
patent: 5007298 (1991-04-01), Machida
patent: 5584778 (1996-12-01), Machida et al.

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