US3850544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mounting arrangement for a bearing of axial flow turbomachinery having variable pitch stationary blades
Assignee: General Electric Co
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Filing: 1973-11-02
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Granted: 1974-11-26
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Expires: 1993-11-02
Abstract
Abstract Axial flow turbomachinery having at least one stage of variable pitch stationary blades has an annular outer casing and a main frame supporting a main shaft bearing. Each blade of a selected stage includes a blade trunnion coaxial with the blade and a passage extends through the blade and blade trunnion. The outer casing includes a hollow support cylinder in which the blade trunnion is disposed. A rod which is disposed in the passage is secured at its outer end to the casing and at its inner end to the main frame. The pitch of the blade is varied by an eccentric crank which extends through a slot in the support cylinder and is secured to the blade trunnion, the blade being freely rotatable independently of the rod.
Inventors
- 👤 J Ciokajlo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:09
CPC Classifications
F; F01; F01D; F01D17/00; F01D17/10; F01D17/12; F01D17/14; F01D17/16; F01D17/162; F01D9/00; F01D9/06; F01D9/065; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
173 words
A mounting arrangement for securing a main shaft bearing of axial flow turbomachinery of the type having at least one stage of variable pitch stationary blades, the mounting arrangement comprising: a. an annular outer casing supporting said blades; b. a main frame for supporting said main shaft bearing, said main frame including a plurality of bosses; and c. a plurality of supports for securing said main frame to said outer casing wherein each said blade of a selected stage has a support associated therewith, each said support including: i. a rod disposed in a passage in said associated blade, wherein said blade is freely rotatable independently of said rod, ii. said outer casing wherein said outer casing includes a first retaining means for restraining said rod from movement in a radially inward direction and second retaining means for restraining said rod from movement in a direction normal to the axis of said rod, and iii. one of said bosses wherein said boss is restrained from radially inward and axial movement by said rod.
Claim 2
Dependent Claim
173 words
A mounting arrangement for securing a main shaft bearing of axial flow turbomachinery of the type having at least one stage of variable pitch stationary blades, the mounting arrangement comprising: a. an annular outer casing supporting said blades; b. a main frame for supporting said main shaft bearing, said main frame including a plurality of bosses; and c. a plurality of supports for securing said main frame to said outer casing wherein each said blade of a selected stage has a support associated therewith, each said support including: i. a rod disposed in a passage in said associated blade, wherein said blade is freely rotatable independently of said rod, ii. said outer casing wherein said outer casing includes a first retaining means for restraining said rod from movement in a radially inward direction and second retaining means for restraining said rod from movement in a direction normal to the axis of said rod, and iii. one of said bosses wherein said boss is restrained from radially inward and axial movement by said rod.
Claim 3
Dependent Claim
110 words
The mounting arrangement recited in claim 1 wherein each said support further includes: a. a hollow support cylinder mounted to said casing, said support cylinDer including an outer end, said outer end including said first and second retaining means, and an arcuate slot radially inward of said outer end; b. a blade trunnion coaxially mounted to each said associated blade, wherein said blade trunnion is disposed within said support cylinder and said passage extends through said blade trunnion; and c. rotation means for rotating said blade trunnion about its axis, wherein said rotation means extends through said arcuate slot and is secured in torque transmitting relation to said blade trunnion.
Claim 4
Dependent Claim
72 words
The mounting arrangement recited in claim 2 wherein each support further comprises: a. a trunnion bearing for transmitting forces normal to the axis of said blade trunnion to said support cylinder, wherein said trunnion bearing is located at a predetermined radial location; and b. a rod bearing for transmitting forces normal to the axis of said rod to said blade trunnion, wherein said rod bearing is located at said predetermined radial location.
Claim 5
Dependent Claim
129 words
The mounting arrangement recited in claim 3 wherein: a. said predetermined radial location is radially inward of said arcuate slot; b. said trunnion bearing comprises: i. a portion of said support cylinder at said predetermined radial location having a predetermined inside diameter, and ii. a portion of said blade trunnion at said predetermined radial location having an outside diameter substantially equal to but no greater than said predetermined inside diameter of said support cylinder; and c. said rod bearing comprises: i. a portion of said passage at said predetermined radial location having a predetermined inside diameter, and ii. said rod includes lands located at said predetermined radial location, said lands having a predetermined outside diameter substantially equal to but no greater than said predetermined inside diameter of said passage.
Claim 6
Dependent Claim
69 words
The mounting arrangement recited in claim 2 wherein: a. said rotation means comprises an eccentric crank wherein said eccentric crank cooperates with said support cylinder and said blade trunnion to restrain said associated blade from radially inward movement; and b. said associated blade includes a circular shoulder coaxial with said associated blade, wherein said shoulder cooperates with said outer casing to restrain said associated blade from radially outward movement.
Claim 7
Dependent Claim
43 words
The mounting arrangement recited in claim 2 wherein: a. said main frame includes a plurality of lubricant passages communicating with said main shaft bearing; b. said rod is hollow and said inner end of said rod communicates with one of said lubricant passages.
Claim 8
Dependent Claim
26 words
The mounting arrangement recited in claim 2 wherein: a. said rod has a generally radially directed axis; and b. said support cylinder is generally radially directed.
Claim 9
Dependent Claim
122 words
The mounting arrangement recited in claim 2 wherein: a. said outer end of said support cylinder includes a washer having an aperture therein; b. said rod includes an outer end and an inner end; c. said outer end of said rod extends through said aperture and has a nut threaded thereon; d. said first retaining means comprises said washer in cooperation with said nut, wherein said rod is pretensioned by said nut cooperating with said washer; e. said second retaining means comprises said aperture in said washer in cooperation with said outer end of said rod; and f. said boss includes a spool for receiving said inner end of said rod wherein said rod extends into said spool and is fixed thereto.
Claim 10
Dependent Claim
170 words
The mounting arrangement recited in claim 2 wherein: a. said outer end of said support cylinder includes a washer having an aperture therein; b. said rod is pretensioned and includes an inner end and an outer end; c. said outer end of said rod extends through said aperture and has a nut threaded thereon; d. said first retaining means comprises said washer in cooperation with said nut; e. said second retainIng means comprises said aperture in said washer in cooperation with said outer end of said rod; f. said boss includes a spool wherein said spool has a predetermined inside diameter and a radially inward surface; g. said inner end of said rod is disposed in said spool and has an outside diameter forming an interference fit with said predetermined inside diameter of said spool; and h. said inner end of said rod includes an enlarged member integral therewith, wherein said enlarged member cooperates with said radially inward surface of said spool to restrain said spool from radially inward movement.
Claim 11
Dependent Claim
170 words
The mounting arrangement recited in claim 2 wherein: a. said outer end of said support cylinder includes an aperture and an outer surface; b. said rod is pretensioned and includes an inner end and an outer end; c. said outer end of said rod extends through said aperture in said outer end and has an enlarged portion integral therewith; d. said first retaining means comprises said enlarged portion in cooperation with said outer surface; e. said second retaining means comprises said outer end of said rod in cooperation with said aperture in said outer end; f. said boss includes a spool having a predetermined inside diameter and a radially inward surface; and g. said inner end of said rod extends through said spool and has a predetermined outside diameter forming an interference fit with said predetermined inside diameter of said spool, said inner end of said rod further has a nut threaded thereon, wherein said nut cooperates with said radially inward surface to restrain said spool from radially inward movement.
Claim 12
Dependent Claim
35 words
The mounting arrangement recited in claim 1 wherein said main frame is a truncated cone including an inner end having said main shaft bearing secured thereto and an outer periphery having said bosses secured thereto.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |