Crankshaft isolating decoupler
View Patent ↗An isolating decoupler comprising a hub for connection to a driving shaft, a pulley journalled to the hub, the pulley having a belt engaging surface, a spring engaged between the hub and a spring carrier, the spring radially expandable in a loading direction, a one-way clutch spring disposed radially inward of the spring engaged with the spring carrier and frictionally engagable with the pulley in a loading direction that is opposite the loading direction of the spring, the one-way clutch spring engagable with the hub whereby the frictional engagement of the one-way clutch spring with the pulley can be progressively released in an unloading direction, and an inertial member engaged with the hub through a damping member.
1. An isolating decoupler comprising:
a hub for connection to a driving shaft;
a pulley journalled to the hub, the pulley having a belt engaging surface;
a spring engaged between the hub and a spring carrier, the spring radially expandable in a loading direction;
a one-way clutch spring disposed radially inward of the spring engaged with the spring carrier and frictionally engagable with the pulley in a loading direction that is opposite the loading direction of the spring;
the one-way clutch spring engagable with the hub whereby the frictional engagement of the one-way clutch spring with the pulley can be progressively released in an unloading direction; and
an inertial member engaged with the hub through a damping member.
2. The isolating decoupler as in claim 1 , wherein the damping member comprises elastomeric material.
3. The isolating decoupler as in claim 1 , wherein the pulley is journalled to the hub on a bushing.
4. The isolating decoupler as in claim 1 , wherein the spring is loaded in the unwinding direction.
5. The isolating decoupler as in claim 1 , wherein the one-way clutch spring is loaded in the winding direction.
6. The isolating decoupler as in claim 1 , wherein the spring comprises a torsion spring.
7. The isolating decoupler as in claim 1 , wherein the one-way clutch spring comprises a coil spring.
8. An isolating decoupler comprising:
a hub for connection to a driving shaft;
a pulley journalled to the hub, the pulley having a belt engaging surface;
a torsion spring engaged between the hub and a spring carrier, the torsion spring loaded in an unwinding direction;
a one-way clutch spring disposed radially inward of the torsion spring engaged with the spring carrier and frictionally engagable with the pulley in a loading direction that is opposite the loading direction of the torsion spring;
the one-way clutch spring engagable with the hub whereby the force of the frictional engagement of the one-way clutch spring with the pulley progressively decreases as the load increases beyond a predetermined level; and
an inertial member engaged with the hub through a damping member.
9. The isolating decoupler as in claim 8 , wherein the one-way clutch spring is loaded in a winding direction.
10. The isolating decoupler as in claim 8 , wherein the pulley comprises a multi-ribbed belt engaging surface.
11. An isolating decoupler comprising:
a hub;
a pulley journalled to the hub, the pulley having a belt engaging surface;
a torsion spring engaged between the hub and a spring carrier, the torsion spring loaded in an unwinding direction when operated in a driving direction;
a one-way clutch spring disposed radially inward of the torsion spring engaged with the spring carrier and frictionally engagable with the pulley;
the frictional engagement of the one-way clutch spring with the pulley progressively decreases as the load increases beyond a predetermined level; and
an inertial member engaged with the hub through a damping member.
12. The isolating decoupler as in claim 11 , wherein the damping member comprises elastomeric material.
13. The isolating decoupler as in claim 11 , wherein the pulley is journalled to the hub on a bushing.
14. The isolating decoupler as in claim 11 , wherein the torsion spring is loaded in the unwinding direction.
15. The isolating decoupler as in claim 11 , wherein the one-way clutch spring is loaded in the winding direction.
16. The isolating decoupler as in claim 11 , wherein the one-way clutch spring comprises a coil spring.