Filtering pulley
AssigneeDayco Europe S.R.L.
InventorsGianluca Cariccia, Andrea Guala, Ettore Gaude, Gregorio Luciani
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Abstract
A filtering pulley having a hub adapted to be fixed to a rotating shaft, a pulley ring mounted coaxial and rotationally free on the hub, and a plurality of elastic assemblies arranged circumferentially with respect to the hub and the pulley ring and each interposed between a pair of first elements integral with the hub and between a pair of second elements integral with the pulley ring is disclosed. Each elastic element forms with the first elements and with the second elements respective angular clearances, and the pulley ring and the hub have a free angle of relative rotation equal to the sum of the above-mentioned angular clearances.
Claims19
A filtering pulley comprising:
- a hub defining a bore for receiving a shaft and an axis of rotation,
- a pulley ring mounted coaxial and rotationally free on said hub,
- a plurality of elastic assemblies arranged circumferentially with respect to said hub and said pulley ring and each interposed between a pair of first elements integral with said hub and between a pair of second elements integral with said pulley ring,
- wherein each of the plurality of elastic assemblies forms with said pair of first elements and with said pair of second elements respective angular clearances (σ, α), said pulley ring and said hub having a free angle (β) of relative rotation in which the hub and pulley ring rotate with respect to each other without any transmission of torque, wherein the free angle (β) is equal to the sum of said angular clearances (σ, α);
- wherein said plurality of elastic assemblies comprise a first arched spring having two sliding blocks applied to respective ends of said first arched spring, the first arched spring and the two sliding blocks slide circumferentially inside a seat formed by said pair of first elements and/or said pair of second elements;
- wherein each of the two sliding blocks are elongate and comprise an arched portion which surrounds a plurality of coils of said first arched spring and a head perpendicular to said arched portion which receives an end of said first arched spring.
A filtering pulley comprising:
- a hub defining a bore for receiving a shaft and an axis of rotation,
- a pulley ring mounted coaxial and rotationally free on said hub,
- a plurality of elastic assemblies arranged circumferentially with respect to said hub and said pulley ring and each interposed between a pair of first elements integral with said hub and between a pair of second elements integral with said pulley ring,
- wherein each of the plurality of elastic assemblies forms with said pair of first elements and with said pair of second elements respective angular clearances (σ, α), said pulley ring and said hub having a free angle (β) of relative rotation in which the hub and pulley ring rotate with respect to each other without any transmission of torque, wherein the free angle (β) is equal to the sum of said angular clearances (σ, α);
- and
- an asymmetric damper that dampens the relative oscillations between said hub and said pulley ring, the asymmetric damper comprising:
- a C-bushing which slidingly cooperates with a cylindrical surface which is integral with one of said hub and said pulley ring and comprises an open metallic ring mounted radially outward on said C-bushing and coupled rotationally thereto, said open metallic ring comprising a protrusion adapted to cooperate with an end of an opening of another of said hub and said pulley ring.
Dependencies are inferred from the claim text.