Patent ID: 6467597
Filing Date: 2002-10-22
Classification: F16D

Abstract:
A double acting baulkring-type synchronizer for selectively synchronizing and positive 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 first element affixed to the shaft concentric to the axis and between the drives; jaw teeth affixed to each drive; a friction surface affixed to each drive; a second element mounted for rotation with and axial movement relative to the first element, the second element having jaw teeth engagable with the jaw teeth of either of the drives in response to a to-or-fro axial engaging movement of the second element from a neutral position by a shift force; a baulkring associated with each drive and axially movable relative to the first element, each baulkring disposed between the first element and the associated drive, and each baulkring including a plurality of pairs of blocker surfaces affixed thereto and a friction surface engagable with the friction surface affixed to each drive to produce a synchronizing torque; blocker surfaces axially affixed to the second element and engagable with the blocker surfaces of either baulkring in response respectively to the to-or-fro movement of the second element for preventing asynchronous engagement of the engagable jaw teeth, for transmitting the operator shift force across the engaged blocker surfaces to effect engagement of the associated friction surfaces, and for producing a torque counter to the synchronizing torque; and rigid member means for disengaging the friction, surface of one baulkring prior to engagement of the friction surface of the other baulkring in response to the second element being moved by the shift force from a position having the second element jaw teeth thereof engaged with the jaw teeth affixed to one drive toward a position for engaging the jaw teeth thereof with the jaw teeth affixed to the other drive; and the rigid member means including a plurality of circumferentially spaced apart rigid joining members each having an axially extending portion extending over a radially outer portion of each baulkring and each having radially inwardly extending and axially spaced apart first and second rigid end portions contactable with axially oppositely facing surfaces of each baulkring for preventing axial separation of the baulkrings in excess to the axially spaced apart first and second rigid end portions.