GB568398A - Improvements in and relating to hydraulically-controlled variable-pitch screw propellers - Google Patents
Improvements in and relating to hydraulically-controlled variable-pitch screw propellersInfo
- Publication number
- GB568398A GB568398A GB1046743A GB1046743A GB568398A GB 568398 A GB568398 A GB 568398A GB 1046743 A GB1046743 A GB 1046743A GB 1046743 A GB1046743 A GB 1046743A GB 568398 A GB568398 A GB 568398A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- pump
- valve
- pitch
- pressure
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Meat, Egg Or Seafood Products (AREA)
- Fluid-Pressure Circuits (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
568,398. Fluid-pressure servomotor control systems. GODDEN, T. E., ELMES, R. T., MORRIS, E. H., EDWARDS, R. A., and HOLBERTON, B. V. June .28, 1943, No. 10467. [Class 135] In addition to the main pump 17 which actuates a piston 10 connected by linkage (not shown) to propeller blades to vary their pitch, a large capacity pump 31 is provided, adapted, when a control valve 36 is operated, to take the place of the main pump to effect rapid movement of the piston in either direction, to reverse the pitch and return it to normal. Normally, the pump 17 supplies pressure fluid to a line 21 or 22 leading to one side or other of the piston 10 when change in speed. causes a centrifugal governor 19 to move a valve 18 in the appropriate direction: The valve 36 is then in the central position shown. To reverse the pitch, the valve 36 is moved to the position 38 thereby cutting off the lines 21, 22 from the cylinder at 43, 44 and cutting in the pump 31 at 46. The pump 31 operates at a high pressure determined by the relief valve 32, and delivers fluid to the right of the piston so that the piston is driven to the left. To restore the pitch to " forward," the valve 36 is moved to position 37, thereby connecting the pump to the left of the piston at 46. A second relief valve 55 is now connected through a passage 52 in a byepass for the pump 31 and as this valve 55 opens at a lower pressure, the pressure available to drive the piston 10 to the right, while still sufficient to effect rapid operation, is insufficient to move the piston beyond the normal operating range. The limit of this range is determined by an extension 60 of the piston, closing at 58 the normal outlet for fluid from the right-hand end of the cylinder. To move the piston farther, for feathering, pressure sufficient to open a valve 56 controlling a byepass must be provided, e.g. by means of a separate "feathering" pump 29. Specifications 517,696 and 543,991, [both in Group XXXIII], are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1046743A GB568398A (en) | 1943-06-28 | 1943-06-28 | Improvements in and relating to hydraulically-controlled variable-pitch screw propellers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1046743A GB568398A (en) | 1943-06-28 | 1943-06-28 | Improvements in and relating to hydraulically-controlled variable-pitch screw propellers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB568398A true GB568398A (en) | 1945-04-03 |
Family
ID=9968389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1046743A Expired GB568398A (en) | 1943-06-28 | 1943-06-28 | Improvements in and relating to hydraulically-controlled variable-pitch screw propellers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB568398A (en) |
-
1943
- 1943-06-28 GB GB1046743A patent/GB568398A/en not_active Expired
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