Improved filtering pulley
AssigneeDayco Europe S.R.L.
InventorsGianluca CARICCIA, Miriam NARDONE, Andrea GUALA, Gilberto DELLE ROSE, Federico LICATA
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Abstract
A filtering pulley for an accessory transmission of an internal combustion engine that has a hub, a crown, a filtering unit or transmitting the torque interposed between the hub and the crown, a torsion spring, a carrier, and a torque limiting joint. The torque limiting joint is coupled to interface with one of the surfaces between the crown and has an open-loop strip spring. The torque limiting joint and is configured to slide with respect to said surface when the torque transmitted between the crown and the hub reaches a predetermined level.
Claims15
A filtering pulley (1) for an accessory transmission of an internal combustion engine, comprising a hub (2), an annular crown (3) provided with a profile configured to cooperate with a transmission belt (5), externally coaxial around an axis (A) to said hub (2) and supported in free rotational motion on the hub itself, and a filtering unit (4) for transmitting the torque interposed between said hub (2) and said crown (3) and comprising a torsion spring (11), an individual carrier (12) and a torque limiting joint (20),
- said carrier (12) cooperating by sliding with respect to one between a portion (2b) of said hub (2) and said crown (3), said carrier (12) defining a spring holder (15) and a projection (17) extending along said axis (A) and configured to cooperate with said torque limiting joint (20),
- said torsion spring (11) being operatively interposed between said carrier (12) and one between a portion (2b) of said hub (2) and said crown (3) and being provided with two ends cooperating in contact with respective spring holders (15) integral with said carrier (12) and said hub (2),
- said torque limiting joint (20) being coupled to interference on one surface (3′″) of the other between said crown (3) and said hub (2)
- said torque limiting joint (20) comprising an open-loop strip spring (21) and being configured to slide with respect to said surface (3″) when the torque transmitted between said crown (3) and said hub (2) reaches a predetermined level (T1, T2).
- wherein said surface (3″) is made on said crown (3), said carrier (12) slides with respect to said hub (2) and said spring (11) is operatively interposed between said carrier (12) and said hub (2) and wherein said carrier (12) defines a pair of radial projections (14) configured to cooperate selectively circumferentially in contact with respective axial projections (18) integral with said hub (2).
Dependencies are inferred from the claim text.