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The Multi-Mode Clutch - A New Technology for Freewheeler Shifting Automatic Transmissions
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 01, 1993 by SAE International in United States
Annotation ability available
This paper introduces a new multi-plate clutch system that allows freewheeler shifts without the need for conventional roller or sprag type clutches. When set in the one-way mode, the Multi-Mode Clutch holds torque in one direction, but releases in a controlled, self-synchronized manner when the direction of torque reverses. In the normal mode, the clutch holds torque in both directions, providing engine braking in coast.
A bi-directional version of this clutch can be set to function as a one-way clutch in either direction. This version eliminates two roller/sprag clutches and a plate clutch.
In a third version, the clutch utilizes a thrust force from an adjacent gear unit to control its capacity.
This clutch can be packaged in less space than conventional devices with equivalent function, and offers opportunities for significant cost savings.
CitationKoivunen, E., Annis, R., and Wilfinger, E., "The Multi-Mode Clutch - A New Technology for Freewheeler Shifting Automatic Transmissions," SAE Technical Paper 930911, 1993, https://doi.org/10.4271/930911.
- WinchellF.J. and RouteW.D. “Ratio Changing the Passenger Car Automatic Transmission”; Passenger Car Transmission Design Practices, SAE Publication
- KoivunenErkki“Multi-Mode Clutch for Change-Speed Transmissions”; U.S. Patent No. 5,031,746”.
- KoivunenErkki“Bi-Directional Multi-Mode Clutch for Change-Speed Transmission Unit for Automatic Change-Speed Transmissions”; U.S. Patent No. 5,106,348”.
- KoivunenErkki“Gear Thrust Controlled Multi-Mode Clutch for Power Transmission”; U.S. Patent pending”.