US3817657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integral turbine wheel with axial through-openings at the outer rim and with controlled rim cracks
Assignee: MTU Aero Engines AG
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Filing: 1972-11-08
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Granted: 1974-06-18
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Expires: 1992-11-08
Abstract
Abstract A turbine wheel in which the rim and the blades are made in one piece; intended breaking places for radial heat cracks are provided at the ends of radial slots and through-openings are provided which extend through the rim portions of the turbine wheel substantially in the axial direction and thereby prevent the continuation of the heat cracks in a radially inward direction; the through-openings interconnect the high pressure side and the low pressure side of the turbine wheel while the intended breaking places are located between the slots and the through-openings.
Inventors
- 👤 A Hueber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:58
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/02; F01D5/08; F01D5/081; F01D5/021
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
108 words
A turbine wheel having rim means and blade means made in one piece, said rim means including an outer rim portion, comprising: radial slot means provided at said outer rim portion, means forming intentional breaking places for radial heat cracks provided at the ends of said radial slot means, aperture means disposed in said rim portion in a generally axially direction for preventing said radial heat cracks from continuing in a radially inward direction, said aperture means including means for communicating the high pressure side with the low pressure side of the turbine wheel, said intentional breaking places being disposed between said slot means and said aperture meanS.
Claim 2
Dependent Claim
108 words
A turbine wheel having rim means and blade means made in one piece, said rim means including an outer rim portion, comprising: radial slot means provided at said outer rim portion, means forming intentional breaking places for radial heat cracks provided at the ends of said radial slot means, aperture means disposed in said rim portion in a generally axially direction for preventing said radial heat cracks from continuing in a radially inward direction, said aperture means including means for communicating the high pressure side with the low pressure side of the turbine wheel, said intentional breaking places being disposed between said slot means and said aperture meanS.
Claim 3
Dependent Claim
66 words
A turbine wheel according to claim 1, wherein said aperture means include prism-shaped apertures and said communicating means includes small pipe means disposed in said apertures, said pipe means being provided with a partition wall means in the inner cross section thereof for substantially completely closing off said cross section, said small pipe means being disposed in said aperture means to permit a radial play therein.
Claim 4
Dependent Claim
21 words
A turbine wheel according to claim 2, wherein said apertures and said small pipe means have a substantially circular cross section.
Claim 5
Dependent Claim
43 words
A turbine wheel according to claim 3, wherein said apertures are of oval shape with the major axis of said oval shape being directed radially in relation to the turbine wheel axis, and wherein said small pipe means have an oval cross section.
Claim 6
Dependent Claim
20 words
A turbine wheel according to claim 4, wherein said apertures and said small pipe means have an eliptical cross section.
Claim 7
Dependent Claim
59 words
A turbine wheel according to claim 1, wherein the outer contour of said small pipe means is profiled and is provided with web means extending in the axial direction for the support of said small pipe means in the said aperture means, said web means forming therebetween channel means for the guidance of cooling air through the turbine wheel.
Claim 8
Dependent Claim
21 words
A turbine wheel according to claim 6, wherein said apertures and said small pipe means have a substantially circular cross section.
Claim 9
Dependent Claim
43 words
A turbine wheel according to claim 6, wherein said apertures are of oval shape with the major axis of said oval shape being directed radially in relation to the turbine wheel axis, and wherein said small pipe means have an oval cross section.
Claim 10
Dependent Claim
20 words
A turbine wheel according to claim 8, wherein said apertures and said small pipe means have an eliptical cross section.
Claim 11
Dependent Claim
66 words
A turbine wheel according to claim 6, wherein said aperture means include prism-shaped apertures and said communicating means includes small pipe means disposed in said apertures, said pipe means being provided with a partition wall means in the inner cross section thereof for substantially completely closing off said cross section, said small pipe means being disposed in said aperture means to permit a radial play therein.
Claim 12
Dependent Claim
36 words
A turbine wheel according to claim 2, wherein said small pipe means is provided with a smooth outer contour, and wherein the inner walls of said apertures are provided with substantially axially extending ribs forming webs.
Claim 13
Dependent Claim
21 words
A turbine wheel according to claim 11, wherein said apertures and said small pipe means have a substantially circular cross section.
Claim 14
Dependent Claim
43 words
A turbine wheel according to claim 11, wherein said apertures are of oval shape with the major axis of said oval shape being directed radially in relation to the turbine wheel axis, and wherein said small pipe means have an oval cross section.
Claim 15
Dependent Claim
20 words
A turbine wheel according to claim 12, wherein said apertures and said small pipe means have an eliptical cross section.
Claim 16
Dependent Claim
66 words
A turbine wheel according to claim 11, wherein said aperture means include prism-shaped apertures and said communicating means includes small pipe means disposed in said apertures, said pipe means being provided with a partition wall means in the inner cross section thereof for substantially completely closing off said cross section, said small pipe means being disposed in said aperture means to permit a radial play therein.
Claim 17
Dependent Claim
36 words
A turbine wheel according to claim 6, wherein one of said web means is somewhat wider than the remaining web means, said wider web means being arranged radially outwardly in relation to the turbine wheel axis.
Claim 18
Dependent Claim
36 words
A turbine wheel according to claim 11, wherein one of said web means is somewhat wider than the remaining web means, said wider web means being arranged radially outwardly in relation to the turbine wheel axis.
Claim 19
Dependent Claim
50 words
A turbine wheel according to claim 2, a lug is provided at each end of said pipe means and the turbine wheel being provided with grooves engageable with said lugs, saiD grooves being disposed on the radially outwardly directed side of the apertures in relation to the turbine wheel axis.
Claim 20
Dependent Claim
22 words
A turbine wheel according to claim 6, wherein said pipe means are provided with bores outside the area of said web means.
Claim 21
Dependent Claim
23 words
A turbine wheel according to claim 19, wherein said bores are substantially radial bores in relation to the axis of said pipe means.
Claim 22
Dependent Claim
51 words
A turbine wheel according to claim 20, wherein a lug is provided at each end of said pipe means and the turbine wheel is provided with grooves engageable with said lugs, said grooves being disposed on the radially outwardly directed side of the apertures in relation to the turbine wheel axis.
Claim 23
Dependent Claim
22 words
A turbine wheel according to claim 11, wherein said pipe means are provided with bores outside the area of said web means.
Claim 24
Dependent Claim
23 words
A turbine wheel according to claim 22, wherein said bores are substantially radial bores in relation to the axis of said pipe means.
Claim 25
Dependent Claim
43 words
A turbine wheel according to claim 2, wherein said pipe means are provided with web means and bores disposed between said web means, said bores being disposed on the side of said partition wall means near the pressure side of the turbine wheel.
Claim 26
Dependent Claim
23 words
A turbine wheel according to claim 24, wherein said bores are substantially radial bores in relation to the axis of the pipe means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |