| 摘要 |
A relay pulley (1) for endless power transmission between a drive pulley (2) and a driven pulley (3). The relay pulley (1) comprises a rotatable hub (6) carrying, between two external fixed plates (7A, 7B), at least one member (8) movable axially on the hub (6) to delimit with the fixed plates (7A, 7B) two parallel grooves (9A, 9B) of variable dimension adapted to receive respectively a belt (4, 5) of a first (T1) or second (T2) endless belt transmission. The movable member (8) comprises at least two hollow plates (8A, 8B) mounted on the hub (6), which include facing bearing surfaces (10A, 10B) in sliding contact. The bearing surfaces (10A, 10B) are arranged to permit the approach or respectively the movement apart of the movable plates (8A, 8B).
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