Patent ID: 6053294
Filing Date: 2000-04-25
Classification: F16D

Abstract:
Synchronizer in a vehicle gearbox comprising a guide sleeve, intended to be non-rotatably joined to a shaft in the gearbox, an engaging sleeve which is non-rotatably, but axially displaceably, mounted on the guide sleeve, an engaging ring provided with exterior engaging teeth and which is intended to be securely joined to a gear rotatably mounted on said shaft and is lockable relative to the guide sleeve by axial displacement of the engaging sleeve from a neutral position to an engagement position, in which interior engaging teeth on the engaging sleeve engage the exterior teeth on the engaging ring, and a synchronizing ring cooperating with the engaging sleeve and the engaging ring, said synchronizing ring having a conical frictional surface which is movable to engagement with a facing conical frictional surface on a ring rigidly attached to the engaging ring, means being arranged to amplify the engaging force upon displacement of the engaging sleeve from the neutral position to an engagement position, wherein the synchronizing ring (9;34) is fixed rotationally relative to a torque-transmitting element (20;31), which is axially movable relative to the synchronizing ring and has cam surfaces (25;37) which cooperate with cam surfaces (26;38) on the engaging sleeve (4) and which upon relative rotation between the torque-transmitting element and the engaging sleeve, caused by frictional engagement between the frictional surfaces of the synchronizing ring and the engaging ring, create a force acting on the engaging sleeve in the engaging direction.