US3869221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor wheel fan blade adjusting apparatus for turbojet engines and the like
Assignee: MTU Aero Engines AG
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Filing: 1974-02-19
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Granted: 1975-03-04
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Expires: 1994-02-19
Abstract
Abstract A fan blade adjusting apparatus for adjusting fan blades on a rotor wheel of a turbojet engine of the type having compressor blades and fan blades arranged radially spaced from one another on a common rotatable rotor wheel with the compressor blades supplying air to a primary flow duct of the engine and with the fan blades supplying air to a secondary flow duct of the engine. Piston-cylinder arrangements are arranged in the annular space between the primary and secondary flow ducts for imparting axial movement to an annular member attached by way of pivotal arms to the fan blades such that axial movement of the annular member effects pivotal adjustment of the fan blades. The annular member is attached to and rotatable with the rotor wheel and the forces are transferred from the piston-cylinder arrangement by way of an antifriction bearing having the outer race rotatably fixed but axially movable by way of the piston-cylinder arrangement and an inner race which moves rotatably and axially with the annular member. The fixed casing of the engine in the annular space includes guide elements and open spaces for permitting axial movement of the bearing and associated structure while radially supporting same.
Inventors
- 👤 Walter Wildner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:01
CPC Classifications
F; F01; F01D; F01D7/00; F05; F05D; F05D2220/00; F05D2220/30; F05D2220/36; F05D2260/00; F05D2260/70; F05D2260/74; F05D2260/76
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
192 words
Fan blade adjusting apparatus for adjusting fan blades on a rotor wheel of a fluid flow machine of the type having compressor blades and fan blades circumferentially around said compressor blades on a common rotatable rotor wheel with the compressor blades supplying fluid to a primary flow duct of the flow machine and with the fan blades supplying fluid to a secondary flow duct of said flow machine; said apparatus comprising: bearing means including an inner bearing race, an outer bearing race, and antifriction means interposed between said inner and outer races for permitting relative rotation of said races with respect to one another about the axis of rotation of the rotor wheel, actuating force applying means engageable with one of said inner and outer races for axially moving said bearing means, actuating force transmitting means connected to and movable with the other of said inner and outer races, and coupling means for coupling said transmitting means to said fan blades such that axial movement of said transmitting means effects pivotal adjustment of said fan blades about fan blade pivot axes extending transverse to said axis of rotation of the rotor wheel.
Claim 2
Dependent Claim
192 words
Fan blade adjusting apparatus for adjusting fan blades on a rotor wheel of a fluid flow machine of the type having compressor blades and fan blades circumferentially around said compressor blades on a common rotatable rotor wheel with the compressor blades supplying fluid to a primary flow duct of the flow machine and with the fan blades supplying fluid to a secondary flow duct of said flow machine; said apparatus comprising: bearing means including an inner bearing race, an outer bearing race, and antifriction means interposed between said inner and outer races for permitting relative rotation of said races with respect to one another about the axis of rotation of the rotor wheel, actuating force applying means engageable with one of said inner and outer races for axially moving said bearing means, actuating force transmitting means connected to and movable with the other of said inner and outer races, and coupling means for coupling said transmitting means to said fan blades such that axial movement of said transmitting means effects pivotal adjustment of said fan blades about fan blade pivot axes extending transverse to said axis of rotation of the rotor wheel.
Claim 3
Dependent Claim
50 words
Apparatus according to claim 1, wherein said primary and secondary flow ducts extend coaxially to said axis of rotation of the rotor wheel, and wherein said bearing means, actuating force applying means, and actuating force transmitting means are disposed in an annular space between said primary and secondary flow ducts.
Claim 4
Dependent Claim
52 words
Apparatus according to claim 1, wherein said flow machine includes a fixed casing, wherein said force applying means includes a first portion fixed to said casing and a second portion which is connected to said one of said inner and outer races and is axially movable with respect to said fixed portion.
Claim 5
Dependent Claim
35 words
Apparatus according to claim 3, wherein relatively fixed axially extending guide means are connected to said fixed casing for slidably guiding axial movement of said bearing means while also radially flexibly supporting said bearing means.
Claim 6
Dependent Claim
52 words
Apparatus according to claim 4, wherein said second portion includes ring elements which engage axially facing shoulders of said one of said inner and outer races, and wherein an extension of one of said ring elements includes way means which are axially slidably guided in teeth means of said fixed guide means.
Claim 7
Dependent Claim
43 words
Apparatus according to claim 5, wherein said fixed guide means includes guide extensions positioned radially inwardly and outwardly of the respective inner and outer races for radially guiding said bearing means and for forming recess means accommodating axial movement of said bearing means.
Claim 8
Dependent Claim
30 words
Apparatus according to claim 1, wherein said actuating force applying means is engageable with said outer race and said transmitting means is connected to and movable with said inner race.
Claim 9
Dependent Claim
56 words
Apparatus according to claim 7, wherein said actuating force applying means includes a piston and cylinder movable with respect to one another, with one of said piston and cylinder being attached to a fixed casing of the flow machine and the other of said piston and cylinder being connected to said outer race for movement therewith.
Claim 10
Dependent Claim
47 words
Apparatus according to claim 1, wherein said flow machine is a turbojet engine, said primary flow duct leading to combustion chamber means of said engine and said secondary flow duct being arranged in bypassing relationship to said primary flow duct for applying thrust forces to said engine.
Claim 11
Dependent Claim
29 words
Apparatus according to claim 9, wherein said fan blades are arranged radially outwardly of said compressor blades and are pivotal about said pivot axes independently of the compressor blades.
Claim 12
Dependent Claim
47 words
Apparatus according to claim 6, wherein said flow machine is a turbojet engine, said primary flow duct leading to combustion chamber means of said engine and said secondary flow duct being arranged in bypassing relationship to said primary flow duct for applying thrust forces to said engine.
Claim 13
Dependent Claim
56 words
Apparatus according to claim 9, wherein said actuating force applying means includes a piston and cylinder movable with respect to one another, with one of said piston and cylinder being attached to a fixed casing of the flow machine and the other of said piston and cylinder being connected to said outer race for movement therewith.
Claim 14
Dependent Claim
62 words
Apparatus according to claim 1, wherein said transmitting means includes an annular member, wherein said fan blades include actuating levers extending radially with respect to their respective blade pivot axes, and wherein said actuating levers are connected to said annular member by way of articulated bearings such that axial movement of said annular member results in pivotal movement of said actuating levers.
Claim 15
Dependent Claim
24 words
Apparatus according to claim 1, wherein said actuating force applying means includes one of hydraulic operated means, pneumatically operated means and electromagnetic operated means.
Claim 16
Dependent Claim
43 words
Apparatus according to claim 1, wherein said actuating force applying means includes a plurality of fluid operated piston-cylinder systems which extend parallel to said axis of rotation of the rotor wheel and which are spaced circumferentially equally from one another about said axis.
Claim 17
Dependent Claim
62 words
Apparatus according to claim 10, wherein said transmitting means includes an annular member, wherein said fan blades include actuating levers extending radially with respect to their respective blade pivot axes, and wherein said actuating levers are connected to said annular member by way of articulated bearings such that axial movement of said annular member results in pivotal movement of said actuating levers.
Claim 18
Dependent Claim
43 words
Apparatus according to claim 16, wherein said actuating force applying means includes a plurality of fluid operated piston-cylinder systems which extend parallel to said axis of rotation of the rotor wheel and which are spaced circumferentially equally from one another about said axis.
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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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |