Relay pulley and its endless transmission
AssigneeFrance Reducteurs
InventorRobert Blanchard
Life of this patent
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Abstract
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).
Claims11
A relay pulley for the endless transmission of power at variable speed between a drive pulley of a first endless transmission with a belt, and a driven pulley of a second endless transmission with a belt, the relay pulley comprising a rotatable hub carrying, between two external plates fixed to said hub, at least one member axially movable on said hub to delimit, with the axially fixed plates two parallel grooves of variable dimension adapted to receive respectively a belt of the first or respectively the second endless belt transmission;
- wherein the axially movable member comprises at least two hollow movable plates mounted on the rotatable hub;
- said movable plates comprising facing bearing surfaces in sliding contact with each other;
- said bearing surfaces being structured and arranged to move axially towards or away from one another upon angular displacement of at least one of the movable plates, as a function of a couple transmitted by the belt from at least one of the transmissions, so as to ensure, by co-action with the external fixed plates an automatic tensioning or a relaxing of the belts of the first and second transmissions.
Dependencies are inferred from the claim text.