Toroidal type continuously variable transmission
US6113513A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1998 |
| Grant date | Sep 5, 2000 |
| Priority date | — |
| Expiry date | Feb 3, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/664
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.