Synchronizer

The invention relates to a synchronizer applied to a transmission, especially an automobile transmission. The synchronizer comprises a synchronization body (1), a slide sleeve which is movably arranged along the circumference in an anti-torque manner and movably arranged along an axial direction of a transmission shaft relative to the synchronization body (1), a first synchronization ring (2) which is rotationally arranged along the circumference relative to the synchronization body and comprises lock teeth, and a pressure part device, wherein the synchronization body is disposed on the transmission shaft of the transmission along the circumference in an anti-torque manner; the pressure part device comprises at least one pressure part (4) which is used to make the first synchronization ring move axially by the slide sleeve; the pressure part can be rotated along the circumference relative to the synchronization body by the first synchronization ring (2) at one or more than one supporting position; and the pre