The Synchronizer reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Synchronizer

Synchronizers are used in manual transmissionss in automobiles built since about 1960 to ease shifting gears by synchronizing the teeth speed prior to engagement. They allow the toothed collar and the gear to be brought to the same rotational speed before the teeth make contact. They consist of a soft metal (usually brass) cone attached to the gear that makes frictional contact with a cone-shaped cavity in the collar before the teeth are engaged.

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