Unison member for variable guide vane
AssigneePratt & Whitney Canada Corp.
InventorDaniel Poick
Life of this patent
Estimating the term…
Abstract
A variable guide vane (VGV) assembly for a gas turbine engine, has: variable guide vanes circumferentially distributed about a central axis, the variable guide vanes rotatable about respective spanwise axes; and a unison member rollingly engageable to a casing of the gas turbine engine for rotation about the central axis, the unison member operatively connected to the variable guide vanes for rotating the variable guide vanes about the respective spanwise axes, the unison member having: a first ring extending around the central axis, a second ring spaced apart from the first ring and extending around the central axis, and connecting members connecting the first ring to the second ring.
Claims19
A variable guide vane (VGV) assembly for a gas turbine engine, comprising:
- variable guide vanes circumferentially distributed about a central axis, the variable guide vanes rotatable about respective spanwise axes;
- and
- a bushing extending around the central axis;
- and
- a unison member rollingly engageable to a casing of the gas turbine engine for rotation about the central axis, the bushing radially supported by the casing, the unison member operatively connected to the variable guide vanes for rotating the variable guide vanes about the respective spanwise axes, the unison member having:
- a first ring extending around the central axis, the first ring rollingly engaged to and radially supported by the bushing, the bushing located radially inwardly of the first ring relative to the central axis,
- a second ring spaced apart from the first ring and extending around the central axis, the second ring engaged to the variable guide vanes, and
- connecting members rigidly connecting the first ring to the second ring, the connecting members being non-rotatable relative to the first ring and the second ring, the second ring cantilevered from the connecting members, the second ring radially supported solely via the connecting members and the first ring.
A gas turbine engine, comprising:
- an annular gaspath extending around a central axis, the annular gaspath defined between a first casing and a second casing;
- and
- a variable guide vane (VGV) assembly having variable guide vanes circumferentially distributed about the central axis, the variable guide vanes rotatable about respective spanwise axes, and a unison member rollingly engaged to the first casing and rotatable about the central axis, the unison member operatively connected to the variable guide vanes for rotating the variable guide vanes about the respective spanwise axes,
- the unison member defining a plurality of pockets circumferentially distributed about the central axis, the pockets located between a first ring and a second ring of the unison member, the first ring and the second ring being part of a monolithic body of the unison member.
Dependencies are inferred from the claim text.