US3957393A — Turbine disk and sideplate construction

Claim 1

Independent Claim 148 words

For use in gas turbine engines, a turbine wheel assembly comprising: a plurality of turbine blades, each having a root section; a disk having an axis of rotation, a face perpendicular to the axis of rotation, a plurality of root cavities disposed about the circumference of the disk, each cavity receiving the root section of a corresponding turbine blade, and a plurality of sideplate retaining lugs extending from the perpendicular face between root cavities, each lug having an arcuate surface facing radially inward toward the axis of rotation; and a plurality of sideplates attached to the disk, each sideplate having an inclined bearing surface which opposes and is inclined with respect to the arcuate surface of one or more disk lugs whereby line contact engagement therebetween is effected, the most radially outward point on the inclined surface being in closest proximity to the perpendicular face of the disk.

Claim 2

Dependent Claim 148 words

For use in gas turbine engines, a turbine wheel assembly comprising: a plurality of turbine blades, each having a root section; a disk having an axis of rotation, a face perpendicular to the axis of rotation, a plurality of root cavities disposed about the circumference of the disk, each cavity receiving the root section of a corresponding turbine blade, and a plurality of sideplate retaining lugs extending from the perpendicular face between root cavities, each lug having an arcuate surface facing radially inward toward the axis of rotation; and a plurality of sideplates attached to the disk, each sideplate having an inclined bearing surface which opposes and is inclined with respect to the arcuate surface of one or more disk lugs whereby line contact engagement therebetween is effected, the most radially outward point on the inclined surface being in closest proximity to the perpendicular face of the disk.

Claim 3

Dependent Claim 35 words

The invention according to claim 1 wherein the bearing surfaces of the sideplates are inclined at an angle within the range of 2° to 10° with respect to the arcuate surfaces of the disk lugs.

Claim 4

Dependent Claim 30 words

The invention according to claim 1 wherein the bearing surfaces of the sideplates is inclined at an angle of 6° with respect to the arcuate surfaces of the disk lugs.

Claim 5

Dependent Claim 36 words

The invention according to claim 1 wherein the disk has a circumferentially extending groove undercutting the arcuate surface of each retaining lug at the juncture of the lug with the corresponding perpendicular face of the disk.

Claim 6

Dependent Claim 163 words

A rotatable disk and blade assembly comprising a turbine disk including a plurality of blade root cavities disposed about the periphery of the disk and a plurality of sideplate retaining lugs on at least one side of the disk, each lug extending between two adjacent root cavities and having an arcuate surface facing radially inward toward the axis of rotation of the disk and blade assembly, a plurality of turbine blades each having a root which engages one of the root cavities, and a plurality of segmented sideplates affixed to at least one side of the disk including a bearing surface inclined with respect to said arcuate surface and having its most radially outward portion in closer proximity to the side of the disk than its most radially inward portion, the inclined bearing surface being operatively positioned so as to engage with line contact one or more of the arcuate surfaces of the disk lugs during rotation of the disk and blade assembly.

Claim 7

Dependent Claim 163 words

A rotatable disk and blade assembly comprising a turbine disk including a plurality of blade root cavities disposed about the periphery of the disk and a plurality of sideplate retaining lugs on at least one side of the disk, each lug extending between two adjacent root cavities and having an arcuate surface facing radially inward toward the axis of rotation of the disk and blade assembly, a plurality of turbine blades each having a root which engages one of the root cavities, and a plurality of segmented sideplates affixed to at least one side of the disk including a bearing surface inclined with respect to said arcuate surface and having its most radially outward portion in closer proximity to the side of the disk than its most radially inward portion, the inclined bearing surface being operatively positioned so as to engage with line contact one or more of the arcuate surfaces of the disk lugs during rotation of the disk and blade assembly.

Claim 8

Dependent Claim 35 words

The invention according to claim 5 wherein the bearing surface of each sideplate is inclined at an angle within the range of 2° to 10° with respect to the arcuate surface of the disk lugs.

Claim 9

Dependent Claim 30 words

The invention according to claim 5 wherein the bearing surface of each sideplate is inclined at an angle of 6° with respect to the arcuate surface of the disk lugs.

Claim 10

Dependent Claim 35 words

The invention according to claim 5 wherein the disk has a circumferentially extending groove undercutting the arcuate surface of each retaining lug at the juncture of the lug with the corresponding side of the disk.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1979-05-18	1979-11-17	1980-05-18	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1983-05-18	1983-11-17	1984-05-18	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1987-05-18	1987-11-17	1988-05-18	$7700.00	Window Closed / Lapsed

Turbine disk and sideplate construction

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