Variable-pitch drives are the simplest of all mechanical adjustable-speed mechanisms. Most of these drives use rubber belts. However, chain types are unmatched in regard to its particular strong ...

Variable speed belt drive sheaves are common on combines. At their simplest, a pair of sheaves at one end of a belt moves closer together or farther apart. Another pair of sheaves at the other end of ...

A CVT, or continuously variable automatic transmission, is a type of automatic transmission that typically uses pulleys and either a belt or chain—as opposed to gears—to transfer the engine's power to ...