Transmission
US6234925A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 18, 1998 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Dec 18, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H63/065
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A continuously variable speed transmission with a first adjustable pulley on an input shaft, a second adjustable pulley on an output shaft, and an endless chain or belt trained over the pulleys employs at least one coil spring which biases one flange of one of the pulleys axially of the respective shaft. The coil spring has larger-diameter end convolutions and smaller-diameter intermediate convolutions. A plenum chamber of a torque sensor or of at least one of several piston-cylinder units--which serve to adjust the axially movable flanges of the pulleys--is bounded in part by a check valve in the form of a composite seal having a rigid annular element and an elastic annular element. One of the annular elements surrounds the other element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.