Retention of a gland within an actuator

Details Retention of a gland within an actuator Retention of a gland within an actuator

2000-03-27

2001-08-14

Nguyen, Hoang (Department: 3748)

Power plants

Motor having exhaust fluid treating or handling means

Including exhaust flow directing or dividing device

C092S169100, C092S151000

Reexamination Certificate

active

06272862

ABSTRACT:

This invention relates to the retention of a gland within the body of an actuator, for example an hydraulic actuator for use in aerospace applications.
In a known type of hydraulic actuator, a gland is mounted about an actuator rod that extends through a cavity defined by the actuator body, the gland forming a fluid-tight partition dividing the cavity into two chambers which, typically, in use, contain hydraulic fluid under pressure. The known gland is retained axially in position within the actuator body by a wire ring located in a passageway formed by opposed grooves extending circumferentially respectively around the outer periphery of the gland and an inner surface of the actuator body defining the cavity.
However, a clearance must be provided between the wire ring and the surfaces defining the circumferentially extending grooves to allow the wire ring to be fed into the grooves during assembly of the actuator. This can result in an undesirable degree of play in the wire ring when located in the grooves leading to possible fretting fatigue problems during the life of the unit. Moreover the space envelope required by the cylinder to accommodate the wire ring necessitates an increase in cylinder diameter around its entire circumference, which can be undesirable for some aerospace applications.
An actuator is provided in accordance with the invention comprising a body defining an internal cavity and a gland disposed within the cavity, the gland being secured against movement relative to the actuator body in a direction along the internal cavity by a securing element located in an opening of which respective parts are defined by the actuator body and the gland, and which allows insertion of the securing element into the opening along a substantially linear path.
In one convenient arrangement, the opening part in the actuator body is formed by a hole and the opening part in the gland is a groove in the outer periphery thereof aligned with the hole, the securing element extending through the hole and lying along the groove.
Alternatively the opening part in the gland is a hole extending through the gland in alignment with the hole in the body, the securing element extending through at least a part of both of the holes.
Conveniently the securing element is locked in position by fastening devices extending axially and/or transversely of the securing element.
The securing element may be configured and arranged to provide in the opening a vent passage extending between the outer peripheral surface of the gland and the body exterior by way of the opening part in the body.


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