Synchronizer arrangements for stepped-ratio transmissions

Details Synchronizer arrangements for stepped-ratio transmissions Synchronizer arrangements for stepped-ratio transmissions

1978-05-15

1980-01-29

Bonck, Rodney H.

192 clutches and power-stop control

Clutches

Progressive engagement

F16D 2306

Patent

active

041857259

ABSTRACT:
A synchronizer arrangement for bringing first and second rotary members of a stepped-ratio transmission, (for example a gearbox mainshaft and a constant-mesh gear that is rotatably mounted on the mainshaft) into rotary synchronism. A primary synchronizer element (for example a synchro ring) is drivable by the first rotary member and is axially movable into frictional engagement with an intermediate element (for example a primary synchronizing cone) to thereby develop at the intermediate element, by the co-operation of respective friction surfaces, a synchronizing drag torque component which by the action of a pair of co-operating ramp surfaces--possibly with interposed friction-reducing rollers--produces axial movement of the intermediate element to provide a clamping action at a pair of opposed radially extending annular friction-clutch surfaces of a secondary synchronizer element that is of higher torque-inducing capacity than the primary element, to provide an additional synchronizing drag torque component which performs the major contribution in bringing the first and second rotary members of the stepped-ratio transmission into rotary synchronism.

REFERENCES:
patent: 3175412 (1965-03-01), Peras
patent: 3347347 (1967-10-01), Hetmann
patent: 3856121 (1974-12-01), Usui et al.

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