Anti-clamping-stagnation synchronizer

The invention discloses an anti-clamping-stagnation synchronizer which comprises a joint sleeve, a gear hub, a sliding block, an elastic supporting piece, a synchronous locking ring and a gear. An outer spline tooth groove is formed in the outer circumferential surface of the gear hub; the joint sleeve is externally connected to the gear hub in a sleeving mode; inner spline teeth are arranged on the inner circumferential surface of the joint sleeve, and are arranged in the outer spline tooth groove in a sliding and clamping mode; a synchronous gear ring is arranged on the side, close to the synchronous locking ring, of the gear; a protection guide assembly is arranged between the synchronous locking ring and the synchronous gear ring and comprises a rubber protection ring, clamping blocksand guide teeth; positioning holes are formed in the rubber protection ring; the rubber protection ring is clamped to one side of the synchronous locking ring through positioning pins and the positioning holes; the clamping b