Abstract: A dual cone pin type synchronizing clutch for driveably connecting to a shaft gear wheels journalled on the shaft includes a hub splined to the shaft, a clutch sleeve connected to the hub through spline teeth that permit axial displacement of the sleeve into engagement with clutching teeth formed with the gear wheel. Each gear wheel carries a cone element engageable with a conical friction surface that is fixed to the gear wheels. A cone arm assembly carries cone members adapted to engage frictionally an intermediate cone member when the sleeve is displaced. The frictional contact between the cone elements, which engage before the clutching teeth engage, operate to synchronize the speed of the gear wheels to that of the synchronizer hub.

Abstract: A pin loading synchronizer includes a hub fixed to a shaft and located between gears journalled on the shaft. The hub carries a synchronizer sleeve that is moved by the vehicle operator into engagement with spline teeth formed integrally with the gears. Each gear carries a cone element that is engageable by external cone members carried on arms that extend through the sleeve. A detent spring in the form of a wire hoop retained on the sleeve resiliently expands radially outward against the interior surface of the cone arm and into a seated position on a detent recess formed on the arm.