Isolator with damping
View Patent ↗An isolator comprising a hub, a pulley frictionally engaged with the hub through a bushing for instantaneous rotational movement, the bushing and hub having a coefficient of friction, a resilient member engaged between the pulley and the hub for transmitting a torque, and a locking member for retaining the pulley on the hub.
1. An isolator comprising:
a hub;
a pulley frictionally engaged with the hub through a bushing for instantaneous rotational movement, the bushing and hub having a coefficient of friction;
a resilient member engaged between the pulley and the hub for transmitting a torque;
a first cam member having a first cam surface, the first cam member fixed to the pulley;
a second cam member having a second cam surface slidingly engaged with the first cam surface;
the first cam member and the second cam member pressingly engaged between the resilient member and the hub; and
a locking member for retaining the pulley on the hub.
2. The isolator as in claim 1 , wherein the resilient member comprises a Belleville washer.
3. The isolator as in claim 1 , wherein the resilient member comprises a torsional spring.
4. The isolator as in claim 1 further comprising a roller bearing disposed between the first cam surface and the second cam surface.
5. The isolator as in claim 1 further comprising a damping member disposed between the pulley and the hub for damping a pulley oscillation.
6. A belt drive system comprising:
an engine crankshaft pulley;
an accessory driven by a belt, the belt trained between the crankshaft pulley and an accessory pulley;
an isolator engaged with the accessory pulley, the isolator comprising:
a hub engaged to the accessory;
the accessory pulley frictionally engaged with the hub through a bushing for instantaneous rational movement, the bushing and hub having a coefficient of friction;
a resilient member engaged between the accessory pulley and the hub for transmitting a torque;
a first cam member fixed to the accessory pulley;
a second cam member slidingly engaged with the first cam member;
the first cam member and the second cam member pressingly engaged between the resilient member and the hub; and
a locking member for retaining the accessory pulley on the hub.
7. The isolator as in claim 6 , wherein the resilient member comprises a Belleville washer.
8. The isolator as in claim 6 , wherein the resilient member comprises a torsional spring.
9. The isolator as in claim 6 further comprising a roller bearing disposed between the first cam surface and the second cam surface.
10. The isolator as in claim 6 further comprising a damping member disposed between the accessory pulley and the hub for damping an accessory pulley oscillation.