An isolator comprising a shaft ( 10 ), a pulley ( 20 ) journalled to the shaft on a first bushing ( 40 ) and a second bushing ( 50 ), the shaft comprising a shaft stop ( 12 ) disposed on a shaft radially outer surface ( 14 ), the pulley and the shaft rotationally moveable relative to each other, the pulley comprising an inner hub ( 23 ), the inner hub having a pulley stop ( 24 ) disposed to cooperatively engage the shaft stop, a torsion spring ( 30 ) engaged with the shaft and the pulley, the torsion spring exerting a contractive force parallel to an axis of rotation (A-A) in order to retain the pulley on the shaft, a cover member ( 60 ) fixed to the shaft, the pulley urged into engagement with the cover member by the torsion spring axial contractive force, and a rubber member ( 80 ) disposed on the shaft stop for engaging the pulley stop.
1. An isolator comprising:
a shaft ( 10 );
a pulley ( 20 ) journalled to the shaft on a first bushing ( 40 ) and a second bushing ( 50 );
the shaft comprising a shaft stop ( 12 ) disposed on a shaft radially outer surface ( 14 );
the pulley and the shaft rotationally moveable relative to each other;
the pulley comprising an inner hub ( 23 ), the inner hub having a pulley stop ( 24 ) disposed to cooperatively engage the shaft stop;
a torsion spring ( 30 ) engaged with the shaft and the pulley, the torsion spring exerting a contractive force parallel to an axis of rotation (A-A) in order to retain the pulley on the shaft;
a cover member ( 60 ) fixed to the shaft, the pulley urged into engagement with the cover member by the torsion spring axial contractive force; and
a rubber member ( 80 ) disposed on the shaft stop for engaging the pulley stop.
2. The isolator as in claim 1 , wherein the pulley comprises a multi-ribbed surface.
3. The isolator as in claim 1 further comprising a tool receiving portion.
4. The isolator as in claim 1 , wherein the pulley comprises a flange forming a labyrinth seal with the cover member.