US4008000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial-flow rotor wheel for high-speed turbomachines
Assignee: MTU Aero Engines AG
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Filing: 1975-08-04
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Granted: 1977-02-15
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Expires: 1995-08-04
Abstract
Abstract A rotor wheel including a hub in the form of a thin-walled shell. Rotor blades are arranged in an annular pattern around the axis of the hub, each blade having at least one blade root formed with a hole. A pin extends through the hole in each blade root, and at least one retaining ring coaxial with the hub axis surrounds all the pins and absorbs radial forces produced by the blades on the pins when the rotor wheel rotates. The retaining rings and blades are fixed against axial and circumferential movement with respect to the hub. A segment between each pin and retaining ring distributes the forces of the pin to the retaining ring. The pins are mounted for radial movement with respect to the hub, and one of the mounting parts for said pins may be detachable from the hub. The hub may be dish shaped, and the pins secured at only one end to the peripheral wall of the hub, that wall having axial slots so that it may expand radially.
Inventors
- 👤 Ottmar Gradl
- 👤 Wolf Loebel
- 👤 Axel Rossmann
- 👤 Herbert Zech
- 👤 Gerhard Zahring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:13
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/30; F01D5/3053
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
144 words
An axial-flow rotor wheel for a high-speed turbomachine comprising: a. a rotatable hub in the form of a thin-walled shell, b. rotor blades arranged in an annular pattern around the axis of said hub, each blade having at least one blade root formed with a hole, c. a pin extending parallel to the hub axis through the hole in each blade root, d. at least one retaining ring coaxial with said hub and surrounding said pins for absorbing the radial forces produced by the blades on said pins when the rotor wheel rotates, and e. means for preventing axial and circumferential movement of said pins with respect to said hub but for permitting radial movement of said pins with respect to said hub, whereby said retaining ring constitutes substantially the only means for resisting radial movement of said pins with respect to said hub.
Claim 2
Dependent Claim
144 words
An axial-flow rotor wheel for a high-speed turbomachine comprising: a. a rotatable hub in the form of a thin-walled shell, b. rotor blades arranged in an annular pattern around the axis of said hub, each blade having at least one blade root formed with a hole, c. a pin extending parallel to the hub axis through the hole in each blade root, d. at least one retaining ring coaxial with said hub and surrounding said pins for absorbing the radial forces produced by the blades on said pins when the rotor wheel rotates, and e. means for preventing axial and circumferential movement of said pins with respect to said hub but for permitting radial movement of said pins with respect to said hub, whereby said retaining ring constitutes substantially the only means for resisting radial movement of said pins with respect to said hub.
Claim 3
Dependent Claim
33 words
An axial-flow rotor wheel as defined in claim 1 wherein each rotor blade has a plurality of axially spaced apart blade roots, and including a retaining ring between each two successive blade roots.
Claim 4
Dependent Claim
49 words
An axial-flow rotor wheel as defined in claim 1 including a segment between each pin and said ring for distributing the forces from said pins to said retaining ring, the outer surface of each segment having the same radius of curvature as the inner surface of said retaining ring.
Claim 5
Dependent Claim
24 words
An axial-flow rotor wheel as defined in claim 3 wherein each of said segments is between a plurality of said pins and said ring.
Claim 6
Dependent Claim
59 words
An axial-flow rotor wheel as defined in claim 1 wherein said means (e) includes parts fixed with respect to said hub, each of said parts having radially extending slots, and each end of each pin being slideably arranged in a slot in one of said parts, whereby radially outward movement of said pins is not transmitted to said hub.
Claim 7
Dependent Claim
27 words
An axial-flow rotor wheel as defined in claim 5 wherein one of said parts is a ring attachable to and detachable from one end of said hub.
Claim 8
Dependent Claim
57 words
An axial-flow rotor wheel as defined in claim 1 wherein said hub is dish shaped and said means (e) includes a hub peripheral wall, said pins being secured at only one end to said hub wall, and said hub wall having a series of axially extending slots in the region where said pins are secured to it.
References Cited (Backward Citations)
FR958441A
Cited
CA619513A
Cited
US927515A
Cited
AU226940A
Cited
DE861734C
Cited
US2931621A
Cited
US3081021A
Cited
GB897415A
Cited
US3694104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-15 | 1980-08-16 | 1981-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-15 | 1984-08-16 | 1985-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-15 | 1988-08-16 | 1989-02-15 | $7700.00 | Window Closed / Lapsed |