GB756134A - An improved variable-pitch propeller for airplanes or other flying machines - Google Patents
An improved variable-pitch propeller for airplanes or other flying machinesInfo
- Publication number
- GB756134A GB756134A GB31336/54A GB3133654A GB756134A GB 756134 A GB756134 A GB 756134A GB 31336/54 A GB31336/54 A GB 31336/54A GB 3133654 A GB3133654 A GB 3133654A GB 756134 A GB756134 A GB 756134A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chamber
- passage
- pitch
- governor
- pump
- 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
- B64C11/40—Blade pitch-changing mechanisms fluid, e.g. hydraulic automatic
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Transmission Devices (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
756,134. Variable-pitch propellers. RATIER AVIATION-MARINE. Oct. 29, 1954 [July 28, 1954], No. 31336/54. Class 114. Each blade in a variable-pitch propeller is mounted in a helical bearing 15, Fig. 1, in a socket 1a on a central hub 1 and carries at its base a gear 25 rigid with it and adapted to engage a rack 31, Fig. 5, secured at one end to a single-acting piston 40 working in a chamber 57 containing ahead of the piston hydraulic fluid provided by a pump 49 driven by the propeller shaft through planet wheels 48 running on a stationary sun wheel 47, a centrifugal governor 67 between the pump and the chamber 57 controlling the increase or decrease of pressure in the chamber to lower or raise the pitch of the propeller blades. Fig. 5 shows the blade at zero pitch with hydraulic fluid locked in the chamber 57 by closure of a release passage 60 by a land 67a on the governor 67 and a pressure passage by a valve 66 in position 66a. The governor 67 moves outwards, against an adjustable spring 68, under centrifugal force until at a speed slightly exceeding the desired one, the land 67a partially clears the passage 60 opening the chamber 57 to a low-pressure chamber 39a communicating by an orifice 54 with the suction chamber 39b of the pump. The centrifugal force of the rotating blades draws them outwards along their helical mountings increasing their pitch and rotating the gear 25 to displace the rack 31 and piston 40 away from the blade. When equilibrium is established, the governor land 67a moves inwards to open the passage 60 and close the passage 61. Pressure built up by the pump lifts the valve 66 to open a release. passage 65 to the chamber 39a.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR756134X | 1954-07-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB756134A true GB756134A (en) | 1956-08-29 |
Family
ID=9165424
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB31336/54A Expired GB756134A (en) | 1954-07-28 | 1954-10-29 | An improved variable-pitch propeller for airplanes or other flying machines |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB756134A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3053267A (en) * | 1957-12-04 | 1962-09-11 | Mccauley Ind Corp | Controllable pitch propeller |
US20140205457A1 (en) * | 2013-01-18 | 2014-07-24 | Snecma | System for changing the pitch of the blades of a propeller |
CN105649849A (en) * | 2016-01-12 | 2016-06-08 | 江西电力职业技术学院 | Water turbine wheel blade operating mechanism |
-
1954
- 1954-10-29 GB GB31336/54A patent/GB756134A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3053267A (en) * | 1957-12-04 | 1962-09-11 | Mccauley Ind Corp | Controllable pitch propeller |
US20140205457A1 (en) * | 2013-01-18 | 2014-07-24 | Snecma | System for changing the pitch of the blades of a propeller |
US9884675B2 (en) * | 2013-01-18 | 2018-02-06 | Snecma | System for changing the pitch of the blades of a propeller |
CN105649849A (en) * | 2016-01-12 | 2016-06-08 | 江西电力职业技术学院 | Water turbine wheel blade operating mechanism |
CN105649849B (en) * | 2016-01-12 | 2017-11-10 | 江西电力职业技术学院 | Hydraulic turbine vane operating mechanism |
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