GB479888A - Improvements relating to hydraulically-actuated variable-pitch airscrews for aircraft - Google Patents

Improvements relating to hydraulically-actuated variable-pitch airscrews for aircraft

Info

Publication number
GB479888A
GB479888A GB2933536A GB2933536A GB479888A GB 479888 A GB479888 A GB 479888A GB 2933536 A GB2933536 A GB 2933536A GB 2933536 A GB2933536 A GB 2933536A GB 479888 A GB479888 A GB 479888A
Authority
GB
United Kingdom
Prior art keywords
valves
pressure
pump
pipes
conduit
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
GB2933536A
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.)
Bristol Aeroplane Co Ltd
Original Assignee
Bristol Aeroplane 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 Bristol Aeroplane Co Ltd filed Critical Bristol Aeroplane Co Ltd
Priority to GB2933536A priority Critical patent/GB479888A/en
Publication of GB479888A publication Critical patent/GB479888A/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
    • B64C11/38—Blade pitch-changing mechanisms fluid, e.g. hydraulic
    • B64C11/42—Blade pitch-changing mechanisms fluid, e.g. hydraulic non-automatic

Abstract

479,888. Fluid - pressure servomotor - control systems. BRISTOL AEROPLANE CO., Ltd., MILNER, H. L., and FEDDEN, A. H. R. Oct. 28, 1936, No. 29335. [Class 135] [Also in Group XXXIII] In hydraulic systems for actuating the variable pitch mechanism of air screws, the return conduit to the hydraulic pump is connected with the discharge side of the lubricating oil pump of the engine, so as to maintain therein a positive pressure. The hydraulic system includes a piston 11 and cylinder 10 mounted within the boss the cylinder being coupled to the blade for changing the pitch. In the usual manner passages along the hub and crank-shaft are connected by pipes 23, 28 with the casing of the hydraulic pump. This pump includes a cylinder block 30 which is rotatable by power and has bores 31 in which are inserted pistons 32, the rods 33 of which are coupled to a pin 34. The eccentricity of this pin which is carried by an end plate 35 can be varied by movement of that plate longitudinally, and to such an extent as to provide for reverse flow. In one construction, a centrifugal governor 44 is connected by pivoted lever 50 with the adjusting rod 52 of the plate 35. For the purpose of setting the speed at which the governor is intended to control the apparatus, a further spring 53 may be coupled to the rod 52, the degree of tension of which is adjustable by a screw and nut gear from the hand wheel 55. The two conduits 23, 28 are connected by pipes 61, 62 through valves in a common casing 60 which has a connection 63 to the delivery pipe 64 of the engine oil lubricating pump 65 the latter having a pressure control valve 69. The valve gear within the casing 60 comprises two valves 70, 71, with interengaging guide sleeves 75 and under a common spring restraint 76, the arrangement being such that these valves form pressure relief valves for the two pipes. Carried by these two valves are smaller valves 77, 78, which are under spring control 80 whereby they are adapted to lift when the pressure within the conduit, which for the moment is acting as a return conduit, falls below that in the pipe line 63 whereby the pressure in the conduit is built up to that in the pipe line 63. Specification 250,292, [Class 114], is referred to.
GB2933536A 1936-10-28 1936-10-28 Improvements relating to hydraulically-actuated variable-pitch airscrews for aircraft Expired GB479888A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2933536A GB479888A (en) 1936-10-28 1936-10-28 Improvements relating to hydraulically-actuated variable-pitch airscrews for aircraft

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2933536A GB479888A (en) 1936-10-28 1936-10-28 Improvements relating to hydraulically-actuated variable-pitch airscrews for aircraft

Publications (1)

Publication Number Publication Date
GB479888A true GB479888A (en) 1938-02-14

Family

ID=10289923

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2933536A Expired GB479888A (en) 1936-10-28 1936-10-28 Improvements relating to hydraulically-actuated variable-pitch airscrews for aircraft

Country Status (1)

Country Link
GB (1) GB479888A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2604951A (en) * 1941-05-24 1952-07-29 Elek K Benedek Hydraulic propeller pitch change mechanism
US2661807A (en) * 1949-04-28 1953-12-08 Sterling A Fielding Hydraulic pitch control device for propellers
DE753739C (en) * 1938-11-23 1954-08-09 Messerschmitt Boelkow Blohm Pressure medium supply for devices of vehicles to be operated or to be lubricated with pressure medium, in particular aircraft

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE753739C (en) * 1938-11-23 1954-08-09 Messerschmitt Boelkow Blohm Pressure medium supply for devices of vehicles to be operated or to be lubricated with pressure medium, in particular aircraft
US2604951A (en) * 1941-05-24 1952-07-29 Elek K Benedek Hydraulic propeller pitch change mechanism
US2661807A (en) * 1949-04-28 1953-12-08 Sterling A Fielding Hydraulic pitch control device for propellers

Similar Documents

Publication Publication Date Title
GB952575A (en) Power plant, e.g. for ground effect vehicles
EP0112793B1 (en) Pitch control system for variable pitch propeller
US2032254A (en) Adjustable pitch propeller
GB828942A (en) Improvements relating to propellers or the like having variable-pitch blades
US2364672A (en) Aerial propulsion
GB480747A (en) Improvements in variable-pitch airscrews for aircraft
GB479888A (en) Improvements relating to hydraulically-actuated variable-pitch airscrews for aircraft
US2280714A (en) Feathering propeller control
US2802335A (en) Fuel supply and associated apparatus for combustion engines
US2343382A (en) Propeller governor
GB629540A (en) Improvements in or relating to apparatus for varying the pitch of variable pitch propellers
US1893612A (en) Propeller
GB517696A (en) Improvements in and relating to variable pitch airscrews
US2557333A (en) Fluid control means
US2145859A (en) Control means for controllable propellers
US2165657A (en) Regulating apparatus for fuel injection pumps of internal combustion engines
US2313795A (en) Variable pitch airscrew
GB465571A (en) Improvements in and relating to aeroplanes having adjustable pitch air-screws
GB343653A (en) Improvements in variable pitch airscrews
GB499514A (en) Variable pitch propeller
GB346844A (en) Improvements in or relating to air screws
GB541839A (en) Improvements relating to hydraulically-actuated variable-pitch screw propellers
US1690034A (en) Variable propeller
GB563009A (en) Variable-pitch propellers
GB250292A (en) Feathering screw propellers