US3901622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Yieldable shroud support
Assignee: Motors Liquidation Co
•
Filing: 1973-05-31
•
Granted: 1975-08-26
•
Expires: 1993-05-31
Abstract
Abstract A gas turbine has a stationary turbine rotor shroud of ceramic mounted on a metal ring. The mounting is resilient metal pins received in circular holes in the shroud ring and in radially extending slots in the supporting ring to allow relative radial expansion while centering the shroud ring with the turbine axis. The locating pins are slightly barrel-shaped and are slotted through the intermediate portion of the pins so they fit snugly in the ceramic but are yieldable to accommodate slight relative shifting or differential thermal expansion of the pin and shroud without imposing high local stresses on the ceramic material.
Inventors
- 👤 James M Ricketts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:33
CPC Classifications
F; F01; F01D; F01D21/00; F01D21/04; F01D21/045; F01D11/00; F01D11/08; F01D25/00; F01D25/24; Y; Y10; Y10T; Y10T403/00; Y10T403/55
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
161 words
A turbine stator structure comprising, in combination, a metallic support ring defining angularly distributed radially extending slots in a radial face of the ring; a shroud ring of ceramic material disposed adjacent to the said face; the rings being coaxial, and the shroud ring defining holes each confronting one of the said slots; and mounting pins each extending into a said slot and into the corresponding hole so as to position and support the ceramic shroud ring and tolerate relative radial expansion of the respective metallic and ceramic material rings, each mounting pin having a head at each end and having a central portion joining the heads, the central portion having longitudinal slots dividing it into at least three substantially equally spaced radially yieldable struts extending in generally parallel relation between the heads, the central portion extending into a said hole and being of such size as to have a slight interference fit therein to center the pin in the hole.
Claim 2
Dependent Claim
161 words
A turbine stator structure comprising, in combination, a metallic support ring defining angularly distributed radially extending slots in a radial face of the ring; a shroud ring of ceramic material disposed adjacent to the said face; the rings being coaxial, and the shroud ring defining holes each confronting one of the said slots; and mounting pins each extending into a said slot and into the corresponding hole so as to position and support the ceramic shroud ring and tolerate relative radial expansion of the respective metallic and ceramic material rings, each mounting pin having a head at each end and having a central portion joining the heads, the central portion having longitudinal slots dividing it into at least three substantially equally spaced radially yieldable struts extending in generally parallel relation between the heads, the central portion extending into a said hole and being of such size as to have a slight interference fit therein to center the pin in the hole.
Claim 3
Dependent Claim
187 words
A turbine stator structure comprising, in combination, a support ring defining angularly distributed radially extending slots in a radial face of the ring; a shroud ring of ceramic material disposed adjacent to the said face; the rings being coaxial, and the shroud ring defining circular holes each confronting one of the said slots; and mounting pins each extending into a said slot and into the corresponding hole so as to support the shroud ring and tolerate relative radial expansion of the rings, each mounting pin having a head of circular external cross section at each end and having a hollow central portion of circular basic cross section joining the heads, the central portion having longitudinal slots dividing it into at lEast three radially substantially equally spaced yieldable struts extending in generally parallel relation between the heads, the diameter of the basic cross section circle of the central portion being slightly greater than that of the head received in the said hole and being sufficiently greater in diameter than the said hole to provide a slight interference fit therein, the central portion being fitted in the said hole.
Claim 4
Dependent Claim
187 words
A turbine stator structure comprising, in combination, a support ring defining angularly distributed radially extending slots in a radial face of the ring; a shroud ring of ceramic material disposed adjacent to the said face; the rings being coaxial, and the shroud ring defining circular holes each confronting one of the said slots; and mounting pins each extending into a said slot and into the corresponding hole so as to support the shroud ring and tolerate relative radial expansion of the rings, each mounting pin having a head of circular external cross section at each end and having a hollow central portion of circular basic cross section joining the heads, the central portion having longitudinal slots dividing it into at lEast three radially substantially equally spaced yieldable struts extending in generally parallel relation between the heads, the diameter of the basic cross section circle of the central portion being slightly greater than that of the head received in the said hole and being sufficiently greater in diameter than the said hole to provide a slight interference fit therein, the central portion being fitted in the said hole.
References Cited (Backward Citations)
US2341664A
Cited
US3066911A
Cited
US3232160A
Cited
US3362681A
Cited
US3451215A
Cited
US3635577A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |