GB700394A - Improvements in or relating to pitch changing mechanisms for propellers - Google Patents
Improvements in or relating to pitch changing mechanisms for propellersInfo
- Publication number
- GB700394A GB700394A GB25338/51A GB2533851A GB700394A GB 700394 A GB700394 A GB 700394A GB 25338/51 A GB25338/51 A GB 25338/51A GB 2533851 A GB2533851 A GB 2533851A GB 700394 A GB700394 A GB 700394A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pitch
- piston
- sleeve
- blades
- reverse
- 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
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
- B64C11/385—Blade pitch-changing mechanisms fluid, e.g. hydraulic comprising feathering, braking or stopping systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H3/00—Propeller-blade pitch changing
- B63H3/06—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical
- B63H3/08—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical fluid
- B63H3/081—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical fluid actuated by control element coaxial with the propeller shaft
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H3/00—Propeller-blade pitch changing
- B63H2003/004—Propeller-blade pitch changing comprising means for locking blades in position
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Hydraulic Motors (AREA)
Abstract
700,394. Variable-pitch propellers. UNITED AIRCRAFT CORPORATION. Oct. 30, 1951 [Nov. 1, 1950], No. 25338/51. Class 114 A variable-pitch propeller having a fluidoperated pitch changing motor operative to move the blades in a normal range and a reverse-pitch range, comprises co-operating elements 33, 150 operative where the blades reach a predetermined reverse pitch position for limiting the pressure acting on the motor piston 32 to that which is only sufficient to overcome the force exerted in the opposite direction due to the centrifugal blade twisting movement which tends to move the blades towards the low-pitch position during rotation. The movement of the motor piston 32 in the low pitch position of the normal governor-controlled constant-speed range is limited by stops 68 which are engaged by a sleeve 35 secured to the piston. The stops are held outwardly by a wedge 90 loaded by a spring 92 and secured to a sleeve 96, loaded by a second spring 110, which carries a piston 104 operable in an axially adjustable cylinder 72. For reversing the blades high pressure liquid supplied by a pump 122 through passages 44, 48 to the inboard side of the piston 32 acts through an annular passage 120 and opens a spring loaded sleeve valve 130 whereby the pressure liquid acts on the inboard side of the piston 104 and moves the latter and the wedge 90 outwardly thereby releasing the stops 68. At the extreme reverse pitch position, bleed ports 150 in the sleeve 35 move past a packing ring 33, carried by an axially adjustable sleeve 38 and place the opposite sides of the piston 32 in communication with one another thereby limiting the movement thereof. A mechanical reverse-pitch stop may also be fitted. Specifications 505,077. 514,725,607,856 and 636,402 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US700394XA | 1950-11-01 | 1950-11-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB700394A true GB700394A (en) | 1953-12-02 |
Family
ID=22092745
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB25338/51A Expired GB700394A (en) | 1950-11-01 | 1951-10-30 | Improvements in or relating to pitch changing mechanisms for propellers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB700394A (en) |
-
1951
- 1951-10-30 GB GB25338/51A patent/GB700394A/en not_active Expired
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