Rolling element used for toroidal-type continuously variable transmission and method for producing same
US6051080A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1997 |
| Grant date | Apr 18, 2000 |
| Priority date | — |
| Expiry date | Dec 19, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S148/906
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The invention relates to a power roller used for a toroidal-type continuously variable transmission. This power roller has on its first side a groove for receiving a bearing, and the surface of the groove (bearing surface) has a carbon concentration which is not lower than that of the back surface of a second side opposed to the first side. The power roller has a hardened outer layer having first and second portions which are respectively defined by the bearing surface and the back surface. The first portion of the hardened outer layer has an effective depth which is not shallower than that of the second portion thereof. The power roller is prepared by the sequential steps of surface-hardening, quenching, and grinding. The surface-hardening process is one of carburizing and carbonitriding. The grinding includes the sequential steps of: (1) grinding at least one of first and second outer portions a quenched preform of the power roller to remove the same, such that there is obtained a datum that is at least one of the surface of the groove and the inner flat surface which are respectively exposed by removing the first and second outer portions; and (2) grinding a third outer portion …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.