Turbocharger actuator with rolling O-ring

Details Turbocharger actuator with rolling O-ring Turbocharger actuator with rolling O-ring

1997-03-20

1998-08-04

Denion, Thomas E.

Expansible chamber devices

Annular working member or annular linearly extending chamber...

92164, 92130R, 92165R, 277173, 277177, F01B 3100

Patent

active

057877912

ABSTRACT:
An actuator for a turbocharger includes a housing having a chamber therein, a piston assembly having a rod and a piston secured to a rod for axial movement therewith, a spring operatively interposed between the piston and the housing for urging the piston upward within the chamber. A hollow retainer is mounted to the housing and extends into the chamber alongside the piston. The retainer has a housed portion having a generally cupped shape with a cavity therein for receiving a pressure signal from the turbocharger. The retainer has axially spaced first and second peripheral protrusions thereon. An O-ring mounts on the retainer between the first and second protrusions and in engagement with the retainer and piston simultaneously. The O-ring rolls between the first and second protrusions in response to the pressure signal and the resulting relative axial movement between the retainer and piston, thus decreasing hysteresis in the actuator.

REFERENCES:
patent: 2955578 (1960-10-01), Flessate
patent: 3116932 (1964-01-01), Mallinckrodt
patent: 3188922 (1965-06-01), Cruse
patent: 4418924 (1983-12-01), Mack
patent: 4899642 (1990-02-01), Hwang
patent: 4948351 (1990-08-01), Williams
patent: 4961372 (1990-10-01), Leonhartsberger

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