Isolator
An isolator comprising a pulley having a pulley stop, a plate attached to the pulley, a shaft, the pulley journalled to the shaft, a torsion spring attached to the shaft, a damping member attached to the torsion spring, the damping member disposed between the plate and the pulley, and the damping member compressing a damping fluid against the pulley stop.
1. An isolator comprising:
a pulley having a first and second pulley stops;
a plate attached to the pulley;
a shaft;
the pulley j ournalled to the shaft;
a torsion spring attached to the shaft; and
a damping member attached to the torsion spring, the damping member disposed between the plate and the pulley,
wherein the damping member comprises a ring comprising two radial extensions, wherein the radial extensions are disposed between the pulley stops, and the pulley comprises a receiver, wherein the each damping member radial extension is engaged with the receiver and is rotatable through the receiver in a first direction until it hits the first pulley stop and in a second direction until it hits the second pulley stop compressing a damping fluid against the first and second pulley stops.
2. The isolator as in claim 1 , wherein the plate is attached to the pulley by a weld.
3. The isolator as in claim 1 , wherein the torsion spring is attached to the shaft by a weld.
4. The isolator as in claim 1 , wherein the damping member is attached to the torsion spring by a weld.
5. The isolator as in claim 1 , wherein the damping fluid comprises grease.
6. The isolator as in claim 1 , wherein the pulley is further journalled to the shaft with a bushing, the bushing engaged with the plate.
7. The isolator as in claim 1 further comprising an attaching screw cooperating with the shaft.
8. The isolator as in claim 1 , wherein the damping member comprises a relief to allow a damping fluid flow.
9. The isolator as in claim 1 , wherein the viscosity of the damping fluid is in the range of 68 cSt at 40 degC to 3000 cSt at 40 degC.
10. The isolator as in claim 1 further comprising a dust cap engaged with the plate.
11. An isolator comprising:
a pulley having a first and second pulley stops;
a shaft;
the pulley j ournalled to the shaft;
a torsion spring attached to the shaft; and
a damping member attached to the torsion spring, wherein the damping member comprises a ring comprising two radial extensions, wherein the radial extensions are disposed between the pulley stops, and the pulley comprises a receiver, wherein the each damping member radial extension is engaged with the receiver and is rotatable through the receiver in a first direction until it hits the first pulley stop and in a second direction until it hits the second pulley stop compressing a damping fluid against the first and second pulley stops.
12. The isolator as in claim 11 , wherein the viscosity of the damping fluid is in the range of 68 cSt at 40 degC to 3000 cSt at 40 degC.
13. An isolator comprising:
a pulley having a first and second pulley stops;
a shaft;
the pulley j ournalled to the shaft;
a torsion spring attached to the shaft;
a damping member attached to the torsion spring, wherein the damping member comprises a ring comprising two radial extensions, wherein the radial extensions are disposed between the pulley stops, and the pulley comprises a receiver, wherein the each damping member radial extension is engaged with the receiver and is rotatable through the receiver in a first direction until it hits the first pulley stop and in a second direction until it hits the second pulley stop compressing a damping fluid against the first and second pulley stops, the viscosity of the damping fluid in the range of 68 cSt at 40 degC to 3000 cSt at 40 degC; and
a cover member attached to the pulley enclosing the receiver.