Rolls-Royce Corporation

Grace Aker

Jonathan Acker

Michael Nesteroff

Mark E Whitlock

Nathanael Cooper

Alex Ertman

Cassandra Cummings

Younes Khamliche

The bearing surface between a thrust bushing and a boss/or face is increased with the addition of a ring or tab that extends radially into a casing bore configured to receive a bushing and cooperating spindle of a variable stator/guide vane. The addition of the ring adds additional bearing surface area without increasing the size of the vane penny, reducing spindle diameter or reducing the bushing bore diameter.

Axial case ring to maximize thrust bushing contact area of variable vane

A centrifugal impeller shroud assembly has a dynamically moveable impeller shroud for encasing a rotatable centrifugal impeller and resolving misalignment between the impeller shroud and the rotatable centrifugal impeller. The assembly comprises a static casing, an impeller shroud, a shroud arm, and a thermal member. The shroud arm is coupled between the casing and the impeller shroud. The thermal member is coupled to the impeller shroud and has a coefficient of thermal expansion (CTE) lower than the CTE of the shroud. The shroud arm comprises a flexible portion configured to flex responsive to a differential pressure across the shroud arm.

Passive clearance control for a centrifugal impeller shroud

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Indianapolis, IN, United States of America

Grace Aker