Two-speed planetary friction accessory drive
US5122099A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1991 |
| Grant date | Jun 16, 1992 |
| Priority date | — |
| Expiry date | Apr 4, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H15/56
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A planetary friction roller drive (30, 66, 84, 26) adapted particularly for use in driving automotive accessories such as an alternator wherein provision is made for delivering engine torque to the ring roller element (26) of the planetary friction drive and for connecting drivably the sun roller element (30) of the friction drive to a driven accessory such as an alternator and wherein a torque flow path characterized by two speed ratios is effected by a compound planetary carrier assembly (50) as a preload at the friction drive contact locations between the planetary rollers (66, 84) and the ring roller element (30) and between the planetary rollers (66, 84) and the sun roller element (30) of the planetary assembly is established by a preload spring (134) actng in a tangential direction, the reaction torque for the planetary friction drive being established by a selectively engageable brake (136) acting on the sun roller element (30) thus effecting a ratio transition from unity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.