Rotary actuator with hole-in-the-wall for fail safe

Details Rotary actuator with hole-in-the-wall for fail safe Rotary actuator with hole-in-the-wall for fail safe

1998-08-07

1999-11-16

Nguyen, Hoang

Expansible chamber devices

Oscillating working member or cylinder therefor

Oscillatory shaft with radially extending vane

92125, 60403, F01C 900

Patent

active

059837829

ABSTRACT:
A fluid powered rotary actuator (10) having a stator (13) and a rotor (15) journalled with limited rotary motion within the stator includes at least one arcuate chamber defined between the rotor and stator and has an angularly movable vane (16) fixed to the rotor. There is a seal member (21, 23) at the vane for slidingly sealing a cylindrical sidewall surface of the stator thereby subdividing the arcuate chamber into two variable volume subchambers (25, 29; 27, 31). Pressurized fluid is ported selectively to one of the subchambers while a fluid egress path for fluid from the other of the subchambers allows the rotor to move angularly within the stator. There is a fail-safe aperture (22) in the cylindrical stator surface in a region traversed by the seal member and for conveying fluid from a selected one of the subchambers, as determined by the position of the vane, and a fail safe valve (24) coupled to and normally blocking the egress of fluid from a subchamber through the aperture (22). The fail-safe valve (24) is energized upon the occurrence of a malfunction to allow fluid flow from the subchamber through the aperture (22). The fail-safe valve (24) may further provide a pressurized fluid path (41, 45) to both subchambers with a fluid return path being provided by through the aperture (22) and fail-safe valve 24 upon the occurrence of a malfunction causing the rotor (15) to move to a neutral position upon occurrence of a malfunction.

REFERENCES:
patent: 2972338 (1961-02-01), Lloyd
patent: 3053236 (1962-09-01), Self et al.
patent: 3327592 (1967-06-01), Wilkinson
patent: 4474105 (1984-10-01), Eicher et al.
patent: 4475738 (1984-10-01), Eicher et al.
patent: 4527461 (1985-07-01), Ogura

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