Rotor balance weight system
A rotor has a rotor body having: a flange with a circumferential array of discontiguous apertures; and a surface spaced apart from the flange. One or more rotor balance weight assemblies each have a weight and a fastener. The weight has: a passageway having a first end and a second end; an internal thread along the passageway; and a boss at the first end of the passageway. The boss is in a respective one of the apertures. The fastener has: a shank having a first end and a second end and an external thread engaged to the passageway internal thread; an engagement feature at the shank first end for engagement by a tool to turn the fastener; and a head at the second end contacts the surface.
1. A rotor body and balance weight assembly combination comprising:
a rotor body having:
a central longitudinal axis;
a flange with a circumferential array of apertures; and
a surface spaced radially apart from the flange and having a plurality of blind recesses, each aligned with a respective associated one of the apertures; and
a rotor balance weight assembly mounted to the flange at a respective associated one of the apertures.
2. The rotor body and balance weight assembly combination of claim 1 further comprising:
a radial flange, the axial flange extending from a junction with the radial flange.
3. The rotor body and balance weight assembly combination of claim 2 further comprising:
a shaft portion of the rotor body, the radial flange extending radially outward from the shaft portion.
4. The rotor body of claim 3 wherein:
the circumferential array of apertures is 12-36 apertures.
5. The rotor body and balance weight assembly combination of claim 4 wherein:
each said blind recess is doubly concave.
6. The rotor body and balance weight assembly combination of claim 1 wherein:
the circumferential array of apertures is 12-36 apertures.
7. The rotor body and balance weight assembly combination of claim 1 wherein:
each said blind recess is doubly concave.
8. A rotor including the rotor body and balance weight assembly combination of claim 2 and further comprising:
a plurality of stages of blades.
9. The rotor of claim 8 wherein the rotor balance weight assembly comprises:
a weight having:
a passageway having a first end and a second end; and
an internal thread along the passageway; and
a fastener having:
a shank having a first end and a second end and an external thread engaged to the passageway internal thread;
an engagement feature at the shank first end for engagement by a tool to turn the fastener; and
a head at the second end, the head in the blind recess associated with the associated one of the apertures.
10. The rotor of claim 8 wherein the rotor balance weight assembly comprises:
a weight having:
a passageway having a first end and a second end;
an internal thread along the passageway; and
a boss at the first end of the passageway, the boss in said respective associated one of the apertures; and
a fastener having:
a shank having a first end and a second end and an external thread engaged to the passageway internal thread;
an engagement feature at the shank first end for engagement by a tool to turn the fastener; and
a head at the second end, the head in the blind recess associated with the associated one of the apertures.
11. A gas turbine engine having:
an axis;
a rotor mounted for rotation about the axis and comprising:
a rotor body having:
a flange with a circumferential array of apertures; and
a surface spaced radially apart from the flange and having a plurality of blind recesses, each aligned with a respective associated one of the apertures;
and
a plurality of stages of blades mounted to the rotor body.
12. The gas turbine engine of claim 11 wherein:
each said blind recess is doubly concave.
13. The gas turbine engine of claim 11 wherein the rotor has:
an open channel having an opening formed radially between the surface and an inner diameter surface of the flange.
14. The gas turbine engine of claim 11 further comprising:
a rotor balance weight assembly mounted to the flange at a respective associated one of the apertures.
15. A gas turbine engine having:
an axis;
a rotor mounted for rotation about the axis and comprising:
a rotor body having:
a flange;
a surface spaced radially apart from the flange; and
a circumferential array of mounting features, each comprising:
an aperture through the flange; and
an associated blind recess in the surface aligned with the aperture;
and
a plurality of stages of blades mounted to the rotor body.
16. The gas turbine engine of claim 15 wherein:
each said blind recess is doubly concave.
17. The gas turbine engine of claim 15 wherein the rotor has:
an open channel having an opening formed radially between the surface and an inner diameter surface of the flange.
18. The gas turbine engine of claim 15 further comprising:
a rotor balance weight assembly mounted to the flange at a respective associated one of the apertures.