| 摘要 |
A pulley unit (1) for a belt drive, particularly for an internal combustion engine, comprising a hub (6), a pulley (3) coaxial to the hub (6) and provided with a crown (11) adapted to cooperate with a belt, a dynamic damper (4) comprising an inertia ring (21) coupled to the hub (6) via an elastic ring (22), and a spiral spring (25) having an outer end portion (27) constrained to the pulley (3) and an inner end portion (26) constrained to the hub (6); the spring (25) is provided with a coating (30) of polymeric material which coats at least the spring end portions (26, 27) and defines with the hub (6) and with the pulley (3) respective friction couplings. |
