GB546995A - Improvements in variable pitch airscrews - Google Patents

Improvements in variable pitch airscrews

Info

Publication number
GB546995A
GB546995A GB1826440A GB1826440A GB546995A GB 546995 A GB546995 A GB 546995A GB 1826440 A GB1826440 A GB 1826440A GB 1826440 A GB1826440 A GB 1826440A GB 546995 A GB546995 A GB 546995A
Authority
GB
United Kingdom
Prior art keywords
pitch
gearing
change
reduction
blades
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1826440A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GEORGE HENRY FITZROY BROWN
PETER HAINES READ
De Havilland Aircraft Co Ltd
Original Assignee
GEORGE HENRY FITZROY BROWN
PETER HAINES READ
De Havilland Aircraft Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GEORGE HENRY FITZROY BROWN, PETER HAINES READ, De Havilland Aircraft Co Ltd filed Critical GEORGE HENRY FITZROY BROWN
Priority to GB1826440A priority Critical patent/GB546995A/en
Publication of GB546995A publication Critical patent/GB546995A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
    • B64C11/30—Blade pitch-changing mechanisms
    • B64C11/32—Blade pitch-changing mechanisms mechanical
    • B64C11/34—Blade pitch-changing mechanisms mechanical automatic

Abstract

546,995. Screw propellers. DE HAVILLAND AIRCRAFT CO., Ltd., GILLMORE, K. B., BROWN, G. H. F., and READ, P. H. Dec. 31, 1940. No. 18264. [Class 114] Pitch-change of an airscrew is effected by a motor which runs continuously in one direction, even if the airscrew engine is stopped, and is connected to the blades through reduction gearing and clutches which are selectively operable to transmit pitch-changing movement in either direction. An electric, hydraulic or other motor may be employed. In the mechanism shown in the Figure, a pitch-change motor 10, mounted on the front of the airscrew hub 11, drives a sun-wheel 13 co-operating with a planet-wheel 14 which is mounted in a cage 16 and co-operates with an annulus 15 fixed in the hub. A spindle 17 mounted in the cage carries a planetpinion 18 which drives epicyclic reduction-gearing 21, 22, 22<SP>1</SP> for rotating the blades 23. The spindle carries also planet-pinions 19, 20 of different diameters co-operating with sun-wheels 26, 30 on shafts 27, 29 carrying splined clutchplates 28, 31 which can be moved into engagement with brake-surfaces 34, 36 by means of an axiallymovable band 32. Complete braking of either clutch-plate locks the associated sun-wheel and causes the reduction-gearing to rotate the blades in one direction or the other for pitch-change. The band 32 may be operated by means of a piston 38 which is moved in one direction by pressure-fluid delivered to a space 37, and in the other direction by a spring 39 or by fluid-pressure. The fluidsystem may be controlled by a governor. Alternatively, the band 32 can be operated by handoperated mechanical means or a remote-control system. In a modification, all the mechanism, excepting the second stage 221 of the reductiongearing, is mounted on the aircraft-engine. The reduction-gearing may effect pitch-change at a higher speed in one direction than in the other. The Provisional Specification refers to Specification 470,284.
GB1826440A 1940-12-31 1940-12-31 Improvements in variable pitch airscrews Expired GB546995A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1826440A GB546995A (en) 1940-12-31 1940-12-31 Improvements in variable pitch airscrews

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1826440A GB546995A (en) 1940-12-31 1940-12-31 Improvements in variable pitch airscrews

Publications (1)

Publication Number Publication Date
GB546995A true GB546995A (en) 1942-08-10

Family

ID=10109465

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1826440A Expired GB546995A (en) 1940-12-31 1940-12-31 Improvements in variable pitch airscrews

Country Status (1)

Country Link
GB (1) GB546995A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577603A (en) * 1946-09-24 1951-12-04 Curtiss Wright Corp Propeller pitch change mechanism
US4578019A (en) * 1982-05-28 1986-03-25 The Garrett Corporation Ram air turbine
US4692093A (en) * 1982-05-28 1987-09-08 The Garrett Corporation Ram air turbine
US5452988A (en) * 1994-04-28 1995-09-26 Sundstrand Corporation Blade pitch change mechanism
EP0684365A2 (en) * 1994-04-28 1995-11-29 ROLLS-ROYCE plc Blade pitch change mechanism

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577603A (en) * 1946-09-24 1951-12-04 Curtiss Wright Corp Propeller pitch change mechanism
US4578019A (en) * 1982-05-28 1986-03-25 The Garrett Corporation Ram air turbine
US4692093A (en) * 1982-05-28 1987-09-08 The Garrett Corporation Ram air turbine
US5452988A (en) * 1994-04-28 1995-09-26 Sundstrand Corporation Blade pitch change mechanism
EP0684365A2 (en) * 1994-04-28 1995-11-29 ROLLS-ROYCE plc Blade pitch change mechanism
US5478203A (en) * 1994-04-28 1995-12-26 Rolls-Royce Plc Blade pitch change mechanism
EP0684365A3 (en) * 1994-04-28 1996-12-11 Rolls Royce Plc Blade pitch change mechanism.

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