US3973875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbine discs and blades for gas turbine engines
Assignee: Rolls Royce PLC
•
Filing: 1975-01-28
•
Granted: 1976-08-10
•
Expires: 1995-01-28
Abstract
Abstract A rotor for a gas turbine engine comprises an outer shell formed in hot pressed silicon nitride and having substantially uniform thickness in a direction parallel to the axis about which the rotor is rotatable and a heat resistant insert which can be either graphite or reaction sintered silicon nitride which fills the space within the shell and is attached to the shell. A row of blades which can be either hot pressed or reaction sintered silicon nitride can be attached to the periphery of the rotor by diffusion bonding.
Inventors
- 👤 Jack Raymond Bird
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:13
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/02; F01D5/021; C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/591; C04B35/593; F01D5/12; F01D5/28; F01D5/284
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
A rotor for a bladed gas turbine engine, the rotor including a hub portion comprising an outer shell formed from hot pressed silicon nitride and at least one heat resistant insert which substantially fills the space within the shell and which has a lower strength then said shell, said heat resistant insert being attached to the shell, the shell being formed by two shell portions, and each of said shell portions having a thickness which is substantially constant in a direction parallel to an axis about which the rotor is rotatable.
Claim 2
Dependent Claim
91 words
A rotor for a bladed gas turbine engine, the rotor including a hub portion comprising an outer shell formed from hot pressed silicon nitride and at least one heat resistant insert which substantially fills the space within the shell and which has a lower strength then said shell, said heat resistant insert being attached to the shell, the shell being formed by two shell portions, and each of said shell portions having a thickness which is substantially constant in a direction parallel to an axis about which the rotor is rotatable.
Claim 3
Dependent Claim
42 words
A rotor as claimed in claim 1 in which the shell portions abut each other at one point and two heat resistant inserts are provided to fill the spaces between the shell portions, the inserts and the shell portions being attached together.
Claim 4
Dependent Claim
27 words
A rotor as claimed in claim 1 having a ring of hot pressed silicon nitride attached to the radially innermost faces of the shell and the insert.
Claim 5
Dependent Claim
23 words
A rotor as claimed in claim 1 having a row of blades formed from silicon nitride attached to the periphery of the rotor.
Claim 6
Dependent Claim
30 words
A rotor as claimed in claim 1 in which the insert is formed from reaction sintered silicon nitride and the shell portions are attached to the insert by diffusion bonding.
References Cited (Backward Citations)
GB694170A
Cited
US2783966A
Cited
US3222438A
Cited
US3664766A
Cited
US3900668A
Cited
US3892835A
Cited
US3905723A
Cited
US3881845A
Cited
US3854189A
Cited
US3887411A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |