US3937593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor assemblies
Assignee: ZF International UK Ltd
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Filing: 1974-03-18
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Granted: 1976-02-10
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Expires: 1994-03-18
Abstract
Abstract In a rotor assembly, first and second annular discs are axially spaced apart on a rotatable shaft so as to be rotatable with the shaft. A plurality of rotor blades are located between the discs and are angularly spaced around the axis of the shaft, and means urges the discs against the blades so that a root portion of each blade is trapped between the discs with the remainder of the blade projecting from the discs. Each root portion is shaped so as to be non-complementary with the portions of the discs between which it is trapped, and each disc is shaped so as to present to each root portion first and second surfaces which, when the shaft is rotated in use, engage respective spaced regions of the root portion so that the root portion is held against axial movement relative to the shaft and against movement radially outwardly relative to the axis of the shaft.
Inventors
- 👤 John Anthony Jeyes
- 👤 Ronald Edward Blakeley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:14
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/30; F01D5/3007; F01D5/3023; F01D5/303; F01D5/3038; F01D5/3069; F01D5/32; F05; F05D; F05D2250/00; F05D2250/70; F05D2250/71; F05D2250/711
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
227 words
A rotor assembly comprising a rotatable shaft, first and second annular discs axially spaced on the shaft and rotatable with the shaft, a plurality of rotor blades located between the discs and angularly spaced around the axis of the shaft, and means urging the discs against the blades so that a root portion of each blade is trapped between the discs with the remainder of the blade projecting from the discs, each root portion being shaped so as to be non-complementary with the portions of the disc between which it is trapped, and each disc being shaped so as to present to each root portion first and second surfaces which, when the shaft is rotated in use, engage first and second spaced regions respectively of the root portion so that the root portion is held respectively against movement radially outwardly relative to the axis of the shaft and against axial movement relative to the shaft, said first surface of each disc presented to a respective root portion being curved about the axis of the shaft and the associated first region of said respective root portion being defined by a further surface which is similarly curved about the axis of the shaft, but which has a radius less than the radius of the curve defined by said first surface so that there is point contact between the surfaces.
Claim 2
Dependent Claim
227 words
A rotor assembly comprising a rotatable shaft, first and second annular discs axially spaced on the shaft and rotatable with the shaft, a plurality of rotor blades located between the discs and angularly spaced around the axis of the shaft, and means urging the discs against the blades so that a root portion of each blade is trapped between the discs with the remainder of the blade projecting from the discs, each root portion being shaped so as to be non-complementary with the portions of the disc between which it is trapped, and each disc being shaped so as to present to each root portion first and second surfaces which, when the shaft is rotated in use, engage first and second spaced regions respectively of the root portion so that the root portion is held respectively against movement radially outwardly relative to the axis of the shaft and against axial movement relative to the shaft, said first surface of each disc presented to a respective root portion being curved about the axis of the shaft and the associated first region of said respective root portion being defined by a further surface which is similarly curved about the axis of the shaft, but which has a radius less than the radius of the curve defined by said first surface so that there is point contact between the surfaces.
Claim 3
Dependent Claim
69 words
A rotor assembly as claimed in claim 1 wherein the second surface of each disc presented to a respective root portion extends in a plane substantially perpendicular to the axis of the shaft and is urged by said means against a parallel, planar surface of the root portion so that the root portion is held between said second surfaces of the disc against axial movement relative to the shaft.
Claim 4
Dependent Claim
101 words
A rotor assembly as claimed in claim 1 wherein the first surface of each disc presented to a respective root portion and the associated further surface of the root portion are arranged so that, when the shaft is rotated, the reaction to centrifugal forces at any point between the surfaces is substantially perpendicular to the axis of the shaft or subtends an angle with the axis of the shaft such that the component of the reaction in a direction parallel with the shaft is insufficient to overcome the friction between the surfaces and therefore to cause relative movement of the surfaces.
Claim 5
Dependent Claim
60 words
A rotor assembly as claimed in claim 1 wherein said means acts on the shaft to cause a portion of the shaft to urge the first disc in a direction parallel with the axis of the shaft and towards the second disc, the latter being held against movement in said direction, whereby the rotor blades are trapped between the discs.
Claim 6
Dependent Claim
63 words
A rotor assembly as claimed in claim 1 wherein the root portion of each blade and the portions of the discs, between which said root portion is trapped, together define respective mutually presented abutments which are urged into interengagement when the shaft is rotated so that the blade is held against angular movement relative to the discs about the axis of the shaft.
Claim 7
Dependent Claim
60 words
A rotor assembly as claimed in claim 5 wherein the root portion of each blade includes an extension which projects into a slot defined by the discs, and each slot is arranged so that in use when the shaft is rotated the respective extension engages a wall of the slot so as to define with the wall said interengaging abutments.
Claim 8
Dependent Claim
46 words
A rotor assembly as claimed in claim 6 wherein the walls of each slot which are spaced apart angularly relative to the axis of the shaft are parallel and each extension is a sliding fit at room temperature between the parallel walls of its respective slot.
Claim 9
Dependent Claim
19 words
A rotor assembly as claimed in claim 1 wherein the rotor blades are formed from hot pressed silicon nitride.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |