Patent ID: 6588561
Filing Date: 2003-07-08
Classification: F16D

Abstract:
A double acting synchronizer for selectively synchronizing and positively connecting a shaft with either of axially spaced apart first and second drives disposed for relative rotation about an axis of the shaft and axially fixed relative thereto; the synchronizer comprising:a hub affixed to the shaft concentric to the axis and disposed between the first and second drives; first and second jaw teeth respectively affixed to the first and second drives; first and second friction surfaces rotatably fixed respectively to the first and second drives; a shift sleeve mounted for fixed rotation with and axial movement relative to the hub and having third and fourth jaw teeth respectively engagable with the first and second jaw teeth in response to a to-or-fro axial engaging movement of the shift sleeve from a neutral position by a shift force; first and second friction rings respectively associated with the first and second drives and respectively having third and fourth friction surfaces respectively movable axially into engagement with the first and second friction surfaces for producing a synchronizing torque; a plurality of first blocker surfaces engagable with a plurality of second blocker surfaces in response to the to-or-fro movement of the shift sleeve for preventing asynchronous engagement of the engagable jaw teeth and for transmitting the operator shift force across the engaged blocker surfaces to effect synchronizing engagement of the friction surfaces, the first blocker surfaces defined by first member means extending radially inward from the shift sleeve and affixed for axial movement thereto; and an axially extending second member means defining the second blocker surfaces and having first and second ends respectively having first and second portions or transmitting the operator shift force to the first and second friction rings.