Clutch ball ramp actuator to maintain state upon loss of power
US5651437A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 1996 |
| Grant date | Jul 29, 1997 |
| Priority date | — |
| Expiry date | Apr 17, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D27/004
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A ball ramp actuator having a control ring axially separated from a pressure plate by rolling members engaging matching opposed grooves having a variable depth acting to supply an axial clamping force against a clutch disc in a clutch assembly and a releasable one-way clutch having a first race attached to the control ring and a second race attached to the pressure plate acting to only allow relative rotation between the control ring and the pressure plate in a direction to increase the clamping force on the clutch disc until a release coil is energized to release the one-way clutch thereby allowing the control ring to rotate relative to the pressure plate in a direction to decrease the clamping force on the clutch disc. A control coil is used to apply an electromagnetic force on the control ring to activate the ball ramp actuator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.