A turbine engine shaft includes a first sub-shaft, a second sub-shaft and a tie shaft. A first bearing surface of the first sub-shaft axially engages a second bearing surface of the second sub-shaft. The tie shaft includes an intermediate tie shaft segment connected axially between a first tie shaft
A turbine engine shaft includes a first sub-shaft, a second sub-shaft and a tie shaft. A first bearing surface of the first sub-shaft axially engages a second bearing surface of the second sub-shaft. The tie shaft includes an intermediate tie shaft segment connected axially between a first tie shaft segment and a second tie shaft segment. The first tie shaft segment includes a first threaded tie shaft surface that is mated with a first threaded shaft surface of the first sub-shaft. The second tie shaft segment includes a second threaded tie shaft surface that is mated with a second threaded shaft surface of the second sub-shaft. The tie shaft also includes a sub-shaft bumper stop extending radially from the intermediate tie shaft segment to a bumper stop distal end, which has a radius that is greater than a radius the first and/or second threaded shaft surfaces.
대표청구항▼
1. A turbine engine shaft, comprising: a first sub-shaft comprising a radial inner first threaded shaft surface that extends along an axis, and a first bearing surface that extends radially inward towards the first threaded shaft surface;a second sub-shaft comprising a radial inner second threaded s
1. A turbine engine shaft, comprising: a first sub-shaft comprising a radial inner first threaded shaft surface that extends along an axis, and a first bearing surface that extends radially inward towards the first threaded shaft surface;a second sub-shaft comprising a radial inner second threaded shaft surface that extends along the axis, and a second bearing surface that extends radially inward towards the second threaded shaft surface, the second bearing surface axially engaging the first bearing surface; anda tie shaft comprising: an intermediate tie shaft segment connected axially between a first tie shaft segment and a second tie shaft segment, the first tie shaft segment comprising a radial outer first threaded tie shaft surface mated with the first threaded shaft surface, and the second tie shaft segment comprising a radial outer threaded second tie shaft surface mated with the second threaded shaft surface; anda sub-shaft bumper stop extending radially from the intermediate tie shaft segment to a bumper stop distal end that comprises a radius that is greater than a radius of at least one of the first threaded shaft surface and the second threaded shaft surface;wherein the first sub-shaft further comprises a radial inner first splined shaft surface that extends along the axis, and the second sub-shaft further comprises a radial outer second splined shaft surface that is mated with the first splined shaft surface;wherein the intermediate tie shaft segment is configured integral with the first tie shaft segment and the second tie shaft segment as a one-piece body;wherein the first bearing surface is arranged radially between the first threaded shaft surface and the first splined shaft surface;wherein the second splined shaft surface is arranged axially between the second threaded shaft surface and the second bearing surface; andwherein the first splined shaft surface and the second splined shaft surface are radially outward aligned with the sub-shaft bumper stop. 2. The shaft of claim 1, wherein the first sub-shaft further comprises a bumper stop bearing surface that extends radially inward towards the first shaft surface; andthe bumper stop bearing surface engages the sub-shaft bumper stop during a first turbine engine shaft assembly step, and is spatially separated from the sub-shaft bumper stop during a second turbine engine shaft assembly step that is subsequent to the first turbine engine shaft assembly step. 3. The shaft of claim 1, wherein the first sub-shaft further comprises a bumper stop bearing surface that extends radially inward towards the first shaft surface;the first threaded shaft surface extends axially towards the bumper stop bearing surface from a first shaft surface end to a second shaft surface end, and the first shaft surface end is located a first axial distance from the bumper stop bearing surface; andthe first threaded tie shaft surface extends axially away from sub-shaft bumper stop from a first tie shaft surface end to a second tie shaft surface end, and the first tie shaft surface end is located a second axial distance from the sub-shaft bumper stop that is less than the first axial distance. 4. The shaft of claim 3, wherein the first bearing surface is arranged axially between the bumper stop bearing surface and the first shaft surface end. 5. The shaft of claim 3, wherein the first bearing surface comprises the bumper stop bearing surface. 6. The shaft of claim 1, wherein the first threaded shaft surface comprises a first thread pitch, and the second threaded shaft surface comprises a second thread pitch that is different than the first thread pitch. 7. The shaft of claim 6, wherein the second thread pitch is finer than the first thread pitch. 8. The shaft of claim 1, wherein the radius of the first threaded shaft surface is substantially equal to the radius of the second threaded shaft surface. 9. The shaft of claim 1, wherein the sub-shaft bumper stop comprises an annular flange. 10. The shaft of claim 1, wherein the sub-shaft bumper stop comprises a plurality of protrusions that are arranged circumferentially around the intermediate tie shaft segment. 11. The shaft of claim 1, wherein the sub-shaft bumper stop comprises a threaded nut mated with a threaded, radial outer tie-shaft surface of the intermediate tie shaft segment. 12. The shaft of claim 1, wherein the sub-shaft bumper stop comprises a fastener that is connected to the intermediate tie shaft segment. 13. A turbine engine shaft, comprising: a first sub-shaft comprising a radial inner first threaded shaft surface that extends along an axis, and a first bearing surface that extends radially inward towards the first threaded shaft surface;a second sub-shaft comprising a radial inner second threaded shaft surface that extends along the axis, and a second bearing surface that extends radially inward towards the second threaded shaft surface, the second bearing surface axially engaging the first bearing surface; anda tie shaft comprising: an intermediate tie shaft segment connected axially between a first tie shaft segment and a second tie shaft segment, the first tie shaft segment comprising a radial outer first threaded tie shaft surface mated with the first threaded shaft surface, and the second tie shaft segment comprising a radial outer threaded second tie shaft surface mated with the second threaded shaft surface; anda sub-shaft bumper stop extending radially from the intermediate tie shaft segment to a bumper stop distal end that comprises a radius that is greater than a radius of at least one of the first threaded shaft surface and the second threaded shaft surface;wherein the first sub-shaft further comprises a radial inner first splined shaft surface that extends along the axis, and the second sub-shaft further comprises a radial outer second splined shaft surface that is mated with the first splined shaft surface;wherein the sub-shaft bumper stop does not radially engage the second sub-shaft;wherein the first bearing surface is arranged radially between the first threaded shaft surface and the first splined shaft surface;wherein the second splined shaft surface is arranged axially between the second threaded shaft surface and the second bearing surface; andwherein the first splined shaft surface and the second splined shaft surface are radially outward aligned with the sub-shaft bumper stop. 14. The shaft of claim 13, wherein the bumper stop distal end comprises a substantially flat surface. 15. The shaft of claim 13, wherein the intermediate tie shaft segment is configured integral with the first tie shaft segment and the second tie shaft segment. 16. The shaft of claim 13, wherein the first threaded shaft surface comprises a first thread pitch, and the second threaded shaft surface comprises a second thread pitch that is different than the first thread pitch. 17. The shaft of claim 16, wherein the second thread pitch is finer than the first thread pitch. 18. The shaft of claim 13, further comprising a keyed washer configured to rotatably fix the tie shaft to the first sub-shaft.
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이 특허에 인용된 특허 (15)
Anderson Bernard J. (Danvers MA) Bobo Melvin (Cincinnati OH), Gas turbine engine motor assembly.
Robbins Donald A. (East Windsor Hill CT) Knotek ; deceased William R. (late of East Hampton CT by Jeanette H. Knotek ; executrix), Two stage turbine rotor assembly.
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