GB696657A - Improvements in or relating to propeller pitch changing devices - Google Patents

Improvements in or relating to propeller pitch changing devices

Info

Publication number
GB696657A
GB696657A GB4853/51A GB485351A GB696657A GB 696657 A GB696657 A GB 696657A GB 4853/51 A GB4853/51 A GB 4853/51A GB 485351 A GB485351 A GB 485351A GB 696657 A GB696657 A GB 696657A
Authority
GB
United Kingdom
Prior art keywords
pitch
pitch changing
pump
relating
lock
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
GB4853/51A
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.)
RTX Corp
Original Assignee
United Aircraft Corp
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 United Aircraft Corp filed Critical United Aircraft Corp
Publication of GB696657A publication Critical patent/GB696657A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Control Of Fluid Gearings (AREA)

Abstract

696,657. Variable-pitch propellers. UNITED AIRCRAFT CORPORATION. Feb. 28, 1951. [May 25, 1950] No. 4853/51. Class 114. A lock to maintain the existing pitch is closed by a spring 344 and is opened by hydraulic pressure from the return line 322 from the pitch changing motor 314 to the sump. If the pitch changing demand is large the outputs of both the main pump 32 and the auxiliary pump 34 are added together by the relief valve 60. When it is required to feather the blade, an auxiliary motor operates the pump and the resulting pressure is led by the by-pass 350, the relief valve 45, and the main valve bore 46 to the conduit 340, thus opening the pitch lock. Specifications 683,729, 688,170, 692,119 and 696,658 are referred to.
GB4853/51A 1950-05-25 1951-02-28 Improvements in or relating to propeller pitch changing devices Expired GB696657A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US696657XA 1950-05-25 1950-05-25

Publications (1)

Publication Number Publication Date
GB696657A true GB696657A (en) 1953-09-02

Family

ID=22090449

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4853/51A Expired GB696657A (en) 1950-05-25 1951-02-28 Improvements in or relating to propeller pitch changing devices

Country Status (1)

Country Link
GB (1) GB696657A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7997074B2 (en) 2009-07-10 2011-08-16 Vestas Wind Systems A/S Hydraulic station and method for controlling pressure in a hydraulic system of a wind turbine
US8123304B2 (en) 2009-06-16 2012-02-28 Vestas Wind Systems A/S Hydraulic system and method for operating a brake of a wind turbine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8123304B2 (en) 2009-06-16 2012-02-28 Vestas Wind Systems A/S Hydraulic system and method for operating a brake of a wind turbine
US7997074B2 (en) 2009-07-10 2011-08-16 Vestas Wind Systems A/S Hydraulic station and method for controlling pressure in a hydraulic system of a wind turbine

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