US3501251A - Variable pitch propeller - Google Patents

Variable pitch propeller Download PDF

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Publication number
US3501251A
US3501251A US700151A US3501251DA US3501251A US 3501251 A US3501251 A US 3501251A US 700151 A US700151 A US 700151A US 3501251D A US3501251D A US 3501251DA US 3501251 A US3501251 A US 3501251A
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United States
Prior art keywords
piston
hub
propeller
fluid
bore
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 - Lifetime
Application number
US700151A
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English (en)
Inventor
Kiell Haglund
Olof Johan Gerhard Hedberg
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Metso Fiber Karlstad AB
Original Assignee
Karlstad Mekaniska Ab
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    • 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
    • B63H3/082—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 the control element being axially reciprocatable
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
    • F03B3/12—Blades; Blade-carrying rotors
    • F03B3/14—Rotors having adjustable blades
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

Definitions

  • variable pitch propellers of various types have been proposed and used in the past in ships, turbines, pumps and other types of bladed devices.
  • the propeller blades are rotatably mounted on a hub and are coupled to a blade pitch control mechanism which selectively pivots the blades about their mounting axes to vary their pitch and set them at a desired pitch.
  • a number of forms of pitch control mechanisms employing mechanical, electro-mechanical and hydraulic principles have been suggested.
  • Some previously proposed pitch control mechanisms have one or more hydraulic pistons which are coupled by axial piston rods to power transmitting devices which transmit the piston movement to the propeller blades. These piston rods impart pivotal movement to the blades by means of sliding blocks or links.
  • Some types require hubs which are extremely heavy in relation to the total propeller weight and are excessively long in relation to the axial space which is required for the fitting and pivoting of the blades in the hub. To be reliable in service, they require precision manufacture and large, strong parts, partly for guiding and sealing the pistons in the cylinders and partly for the guiding of devices which transmit power to the blades.
  • the purpose of this invention is to provide a propeller hub structure embodied in a pitch control mechanism which is free of many of the disadvantages found in 3,501,251 Patented Mar. 17, 1970 "Ice existing propellers, and particularly to provide a hub structure which is light in weight, compact in size, strong and durable, essentially trouble-free, and of low cost as to construction, maintance and repair.
  • a propeller includes a fluid-operated pitch control mechanism, preferably a hydraulic-operated mechanism, located in the hub.
  • the mechanism comprises a double piston struc ture in the form of a rigid unitary member composed of two piston elements which are axially movable in two separate opposed fluid cylinder units, one of which is positioned on each side of the double piston structure in the axial direction of movement of the same, the two cylinders being fixed in the propeller hub.
  • the cylinder units and the piston elements form two fluid-pressure chambers for actuating the double piston structure, and power transmitting elements couple the double piston structure to the propeller blades such that axial motion of the piston structure imparts rotary motion to the blades to vary their pitch.
  • Each of their piston members i.e., the members constituting moving walls or parts of the fluid chambers, making up the double piston structure may have either an internal or an exterior cylindrical surface arranged to slide along a mating cylindrical surface of the companion cylinder unit.
  • the cylinder units i.e., those parts that constitute fixed walls of the fluid chambers, similarly, of course, may have either internal or external cylindrical surfaces along which the companion piston member slides.
  • the cylindrical guiding and sealing surfaces of the pistons and cylinders are coaxial and of equal diameters.
  • FIG. 1 is a side view in section, taken generally along an axial plane, of one embodiment of the invention
  • FIG. 2 is an end view in section through the embodiment of FIG. 1, the section being taken generally along the plane represented by the lines AA and in the direction of the arrows;
  • FIG. 3 is a side view in section taken along a generally axial plane of another embodiment of the invention, the view being in generally schematic form;
  • FIG. 4 is a generally schematic view in section taken along an axial plane of a third embodiment according to the invention.
  • FIG. 5 is a generally schematic, side sectional view taken along an axial plane of a fourth embodiment.
  • FIG. 6 is a generally schematic, side view in axial section of another embodiment of the invention.
  • FIGS. 1 and 2 The embodiment illustrated in FIGS. 1 and 2 includes a hub body 1 which is constructed to carry four propeller blades 3'. Within the body is an axially disposed cavity or bore which receives, inter alia, a hydraulic pitch-control mechanism (described below), [The hub body 1 has four peripherally spaced recesses 7 for pivotal mounting of the propeller blades 3.
  • Each propeller blade 3 is rotatably attached for pitch variation to the hub body 1 by means of a mounting structure composed of bearing ring 11 which is fastened, such as by threads, to the hub body 1 and a crank pin ring 13 which is attached to the blade flange 9 and provided with a crank pin 15 (FIG. 2).
  • the crank pin ring 13 is pivoted on a journal bearing 17 positioned in the hub body recess 7.
  • the hub body 1 is fastened to a flange 19 on a propeller shaft drive 21, and the propeller shaft 21 has a central, axial bore 23. Extending through the bore 23 is a pipe 25 which is arranged for movement in the axial direction through the shaft bore.
  • the pipe 25 and the annulus in the bore 23 between the pipe 25 and the walls of the bore both serve as supply and return conduits for a hydraulic fluid to the hydraulic mechanism in the hub 1.
  • At the opposite end of the hub body from the propeller shaft flange 19 are an end cover 27 and a hub cone 29, the cone and cover being sealed to the body.
  • the hydraulic mechanism provides for the transmission of power from the pressure fluid to each propeller blade 3 through the crank pins 15 on the crank pin rings 13 and includes a one-piece double piston structure 31 located in the cavity or bore 5 of the hub body.
  • the double piston structure 31 consists of two piston portions including on one side a portion 33 which in the form shown in FIGS. 1 and 2 has an external cylindrical guiding and sealing surface 35 which seals against an internal cylindrical face 37 on the end cover 27, these elements being sealed by a seal ring 39 and thereby defining a closed fluid chamber 41 for the pressure fluid.
  • piston portion 43 On the other end of the piston structure 31 is a piston portion 43 which seals against an external guiding and sealing surface 47 of a cylinder unit 49, which is affixed to the hub body 1, thereby defining a chamber 51 for pressure fluid actuating the piston portion 43.
  • the cylinder unit 49 has an opening 53 in its end wall which is sealed by a seal 55 to and receives a tube section 57.
  • the tube section 57 is joined at one end to the piston structure 31 and is provided with an axial bore 59 having a Wider section 61 at the shaft end and a narrower section 63 at the piston end.
  • the pipe 25 extends through the wider section 61 of the bore 59 and is coupled at the end of this section to the narrower section 63, thus connecting it to the fluid chamber 41 for supply and return of pressure fluid to and from the chamber 41.
  • the annular space in the bore 23 between the pipe 25 and the wall of the bore communicates with the Wider section 61 of the bore 59 and thence through radial holes 65 to the fluid chamber 51 for supply and return of pressure fluid to the chamber 51.
  • the supply and return of pressure fluid to and from the chambers 41 and 51 are controlled by a suitable valve control unit which will generally be remote from the propeller hub and located at a control point. Any appropriate source of fluid pressure, and preferably hydraulic pressure, can be employed.
  • the flow of hydraulic fluid to and from the hydraulic mechanism in the hub is regulated by means of a pilot valve located in the hub.
  • a pilot valve located in the hub.
  • Such a pilot valve is operated by axial movement of a pipe corresponding to pipe 25 in FIG. 1.
  • the pipe 25 usually serves only as a supply pipe for pressure fluid while the annulus between the pipe and the shaft bore wall serves as a return conduit.
  • An arrangement of a pilot valve in the hub is shown in Swedish Patent No. 93,872 and can with advantage be used in a propeller according to the present invention.
  • the double piston structure 31 is provided with lugs 67, one for each propeller blade 3, which extend out generally radially from the piston structure 31 through openings 69 in the hub body 1. These openings 69 allow the lugs 67 to move in an axial direction within the hub body 1 a distance necessary for any desired rotational movement of the propeller blades 3.
  • the lugs 67 are preferably located on the central part of the double piston 31.
  • each lug 67 is coupled to a propeller crank pin 15 by means of a sliding block 71 in which the crank pin 15 is rotatably pivoted.
  • the sliding blocks 71 are arranged to slide in bearing grooves 73 machined in the lugs 67 with guide surfaces perpendicular to the longitudinal axis of the piston structure 31.
  • the propeller pitch control mechanism it is desirable in the propeller pitch control mechanism according to the invention to construct the unit such that one of the piston portions, e.g., 33, has an external guiding and sealing surface 35 sliding within a fixed inner seal 39 on its cylinder unit 37 while the other piston unit 43 has an inner seal 45 sliding along an external guiding and sealing surface 47 of its cylinder unit 49.
  • one of the piston portions e.g., 33
  • the other piston unit 43 has an inner seal 45 sliding along an external guiding and sealing surface 47 of its cylinder unit 49.
  • the possibility of the piston structure sticking as a result of asymmetrical load from the propeller blades 3 is considerably reduced.
  • a particularly short hub length is possible if, as shown in FIGS. 4 and 5, one of the cylinder units is recessed in the propeller shaft 21.
  • the guiding and sealing surfaces between the two piston portions and the respective cylinder units be coaxial and of equal diameters. This construction provides operation of the device without any pumping effect in the cavity 5 as the piston structure is moved back and forth
  • FIGS. 3 to 6 show, in generally schematic form, various alternative constructions embodying different arrangements in the guiding and sealing of the piston portions 33 and 43 of the double piston structure 31 along the two cylinder units in the hub body 1.
  • the reference numerals for each figure are the same as those applied to the embodiment of FIGS. 1 and 2, but with the addition of a letter suflix for each alternative embodiment.
  • FIGS. 3 to 6 are basically the same as those of the embodiment of FIGS. 1 and 2, elaborate description of FIGS. 3 to 6 is unnecessary, and reference can be made back to the foregoing description, taken in conjunction with the points mentioned below.
  • FIG. 3 shows an arrangement corresponding substantially to that in FIG. 1.
  • the piston portion 33a of the double piston structure 31a remote from the propeller shaft 21 is provided with an external guiding and sealing surface 35a arranged to slide along an internal seal 3911 on the fixed cylinder unit 37a.
  • the piston portion unit 430 adjacent to the propeller shaft 21 is tubular and provided with an internal seal 45a arranged to slide along the external guiding and sealing surface 47a of the cylinder unit 49a.
  • FIG. 4 shows an arrangement in which the piston portion 33b is tubular and provided with an internal seal 77b which is arranged to slide along the external guiding and sealing surface 79b of the cylinder unit 81b.
  • the piston piston portion 43b is provided with an external guiding and sealing surface 83b arranged to traverse an internal seal 85b on the cylinder unit 87b.
  • the piston unit 330 is provided with an external guiding and sealing surface 35c which is arranged to traverse the internal seal 390 of the cylinder unit 37c.
  • the piston portion 43b is similarly provided with an external guiding and sealing surface 83c arranged to traverse the internal seal 85c on the cylinder unit 870.
  • the piston portion 33d is tubular and has an internal seal 77d which is arranged to slide along an external guiding and sealing surface 79d of the cylinder unit 81a.
  • the piston portion 43a is also tubular and provided with an internal seal 45d arranged to slide along the external guiding and sealing surface 47d of the cylinder unit 49d.
  • a variable pitch propeller for use in ships, pumps, turbines and the like which includes a hub carrying a plurality of propeller blades, each blade being mounted for rotation about an axis generally radially of the hub for adjustment of its pitch
  • a mechanism for rotating the blades to adjust their pitch comprising a unitary double piston structure carried in the hub and including a common wall portion transverse to the hub axis and first and second skirt portions mounted on the common wall portion and disposed axially on the hub, the first skirt portion having an external cylindrical surface and the second skirt portion having an internal cylindrical surface;
  • means defining -a second cavity in the hub including a member fixed on the hub and having an external cylindrical surface slidably mating with the cylindrical internal surface of the second piston skirt portion thereby to define a
  • crank linkage includes a lug on the said proximate portion of the piston second skirt portion inwardly of each blade and having a crank pin slot formed therein, a crank pin on each blade extending into the respective crank pin slot, and bearing means interposed between each crank pin and crank pin slot.
  • first sleeve portion extends rearwardly from the wall portion relative to the shaft carrying the propeller and the second sleeve portion extends forwardly from the wall portion.
  • the combination according to claim 1 further comprising a propeller drive shaft coupled to the hub and including a bore therethrough, a conduit extending through the bore in the shaft and movable axially of the shaft and coupled to the piston structure for movement therewith, the outer surface of the conduit being spaced from the wall of the bore to define a passage, means associated with the piston structure communicating the interior of the pipe with one of the fluid chambers and communicating the passage With the other fluid chamber.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Actuator (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)
  • Hydraulic Turbines (AREA)
  • Hydraulic Motors (AREA)
US700151A 1967-03-22 1968-01-24 Variable pitch propeller Expired - Lifetime US3501251A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE398767 1967-03-22

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US3501251A true US3501251A (en) 1970-03-17

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US (1) US3501251A (es)
JP (1) JPS5217958B1 (es)
CH (1) CH461297A (es)
DE (1) DE1556509B2 (es)
ES (1) ES349282A1 (es)
FI (1) FI45736C (es)
FR (1) FR1553220A (es)
GB (1) GB1213586A (es)
NL (1) NL6800566A (es)
NO (1) NO120011B (es)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3792937A (en) * 1970-11-04 1974-02-19 Dowty Rotol Ltd Bladed rotors
US3802800A (en) * 1971-08-26 1974-04-09 Lips Nv Drunen Variable pitch propeller with emergency control
US4474533A (en) * 1981-02-23 1984-10-02 Kawasaki Jukogyo Kabushiki Kaisha Controllable pitch propeller assembly
US4810166A (en) * 1987-08-03 1989-03-07 Bird-Johnson Company Controllable pitch marine propeller
US5145318A (en) * 1989-11-16 1992-09-08 Bird-Johnson Company Flange-mounted controllable pitch marine propeller
US5364231A (en) * 1992-12-22 1994-11-15 Alliedsignal Inc. Full authority propeller pitch control
US6113351A (en) * 1998-07-15 2000-09-05 Flexxaire Manufacturing Inc. Variable pitch fan
US6358007B1 (en) * 1999-01-28 2002-03-19 Henry A. Castle Universal constant speed variable pitch boat propeller system
US6439850B1 (en) 1998-07-15 2002-08-27 Flexxaire Manufacturing Inc. Variable pitch fan
US20040067135A1 (en) * 2002-09-17 2004-04-08 Flexxaire Manufacturing Inc. Variable pitch fan
US7229250B2 (en) 2003-10-20 2007-06-12 Flexxaire Manufacturing Inc. Control system for variable pitch fan
US20080247877A1 (en) * 2007-01-23 2008-10-09 Snecma Turboprop having a propeller made up of variable-pitch blades
US20100187825A1 (en) * 2009-01-28 2010-07-29 Fred Carr Microprocessor system for controlling rotor pitch
US20120114483A1 (en) * 2009-12-30 2012-05-10 Fred Carr Microprocessor system for controlling rotor pitch
US8465257B1 (en) 2008-10-31 2013-06-18 Brp Us Inc. Variable pitch propeller
US9849955B1 (en) 2017-01-03 2017-12-26 Fred Kiekhaefer Marine surface propulsion device
CN108750057A (zh) * 2018-06-28 2018-11-06 中国船舶重工集团公司第七0四研究所 双曲柄传动的调距桨桨毂
CN109733578A (zh) * 2019-03-12 2019-05-10 中国船舶重工集团公司第七0四研究所 大功率、大尺寸调距桨桨毂
US10800512B2 (en) 2015-09-03 2020-10-13 General Electric Company System and method for propeller pitch control
US11428160B2 (en) 2020-12-31 2022-08-30 General Electric Company Gas turbine engine with interdigitated turbine and gear assembly

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4076453A (en) * 1975-06-23 1978-02-28 Arne Feroy Bearing ring for blade of a controllable pitch propeller
DE3210780C2 (de) * 1982-03-24 1984-08-02 Escher Wyss Gmbh, 7980 Ravensburg Verstellpropeller für Schiffsantrieb
DE4446624A1 (de) * 1994-12-24 1996-06-27 Klein Schanzlin & Becker Ag Verstellpropeller
DE4446622A1 (de) * 1994-12-24 1996-06-27 Klein Schanzlin & Becker Ag Verstellpropeller mit darin angeordnetem Verstellmechanismus
CN101228356B (zh) * 2005-06-22 2012-01-04 Itt制造企业公司 用于调节螺旋桨泵的螺旋桨桨叶的调节装置和包括这种调节装置的螺旋桨泵

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR789794A (fr) * 1934-08-09 1935-11-06 Hélice à pas variable
FR1083482A (fr) * 1953-04-17 1955-01-10 Helice Marine Ratier Forges & Dispositif de commande, notamment du pas d'une hélice
FR1256667A (fr) * 1960-02-10 1961-03-24 Csf Hélice autonome asservie, à pas variable hydraulique, avec dispositif antigivre incorporé
US3150570A (en) * 1963-05-14 1964-09-29 American Mach & Foundry Piston
US3163231A (en) * 1963-04-29 1964-12-29 United Aircraft Corp Two-part pitch changing mechanism
US3212586A (en) * 1964-07-30 1965-10-19 United Aircraft Corp Pitch control system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR789794A (fr) * 1934-08-09 1935-11-06 Hélice à pas variable
FR1083482A (fr) * 1953-04-17 1955-01-10 Helice Marine Ratier Forges & Dispositif de commande, notamment du pas d'une hélice
FR1256667A (fr) * 1960-02-10 1961-03-24 Csf Hélice autonome asservie, à pas variable hydraulique, avec dispositif antigivre incorporé
US3163231A (en) * 1963-04-29 1964-12-29 United Aircraft Corp Two-part pitch changing mechanism
US3150570A (en) * 1963-05-14 1964-09-29 American Mach & Foundry Piston
US3212586A (en) * 1964-07-30 1965-10-19 United Aircraft Corp Pitch control system

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3792937A (en) * 1970-11-04 1974-02-19 Dowty Rotol Ltd Bladed rotors
US3802800A (en) * 1971-08-26 1974-04-09 Lips Nv Drunen Variable pitch propeller with emergency control
US4474533A (en) * 1981-02-23 1984-10-02 Kawasaki Jukogyo Kabushiki Kaisha Controllable pitch propeller assembly
US4810166A (en) * 1987-08-03 1989-03-07 Bird-Johnson Company Controllable pitch marine propeller
US5145318A (en) * 1989-11-16 1992-09-08 Bird-Johnson Company Flange-mounted controllable pitch marine propeller
US5364231A (en) * 1992-12-22 1994-11-15 Alliedsignal Inc. Full authority propeller pitch control
US6113351A (en) * 1998-07-15 2000-09-05 Flexxaire Manufacturing Inc. Variable pitch fan
US6439850B1 (en) 1998-07-15 2002-08-27 Flexxaire Manufacturing Inc. Variable pitch fan
US6644922B2 (en) 1998-07-15 2003-11-11 Flexxaire Manufacturing Inc. Variable pitch fan
US6358007B1 (en) * 1999-01-28 2002-03-19 Henry A. Castle Universal constant speed variable pitch boat propeller system
US20040067135A1 (en) * 2002-09-17 2004-04-08 Flexxaire Manufacturing Inc. Variable pitch fan
US6942458B2 (en) 2002-09-17 2005-09-13 Flexxaire Manufacturing Inc. Variable pitch fan
US7229250B2 (en) 2003-10-20 2007-06-12 Flexxaire Manufacturing Inc. Control system for variable pitch fan
US20080247877A1 (en) * 2007-01-23 2008-10-09 Snecma Turboprop having a propeller made up of variable-pitch blades
US8087890B2 (en) * 2007-01-23 2012-01-03 Snecma Turboprop having a propeller made up of variable-pitch blades
US8465257B1 (en) 2008-10-31 2013-06-18 Brp Us Inc. Variable pitch propeller
US20100187825A1 (en) * 2009-01-28 2010-07-29 Fred Carr Microprocessor system for controlling rotor pitch
US20120114483A1 (en) * 2009-12-30 2012-05-10 Fred Carr Microprocessor system for controlling rotor pitch
US8602731B2 (en) * 2009-12-30 2013-12-10 Fred K. Carr Microprocessor system for controlling rotor pitch
US10800512B2 (en) 2015-09-03 2020-10-13 General Electric Company System and method for propeller pitch control
US9849955B1 (en) 2017-01-03 2017-12-26 Fred Kiekhaefer Marine surface propulsion device
CN108750057A (zh) * 2018-06-28 2018-11-06 中国船舶重工集团公司第七0四研究所 双曲柄传动的调距桨桨毂
CN108750057B (zh) * 2018-06-28 2024-06-04 中国船舶重工集团公司第七0四研究所 双曲柄传动的调距桨桨毂
CN109733578A (zh) * 2019-03-12 2019-05-10 中国船舶重工集团公司第七0四研究所 大功率、大尺寸调距桨桨毂
CN109733578B (zh) * 2019-03-12 2024-03-22 中国船舶重工集团公司第七0四研究所 大功率、大尺寸调距桨桨毂
US11428160B2 (en) 2020-12-31 2022-08-30 General Electric Company Gas turbine engine with interdigitated turbine and gear assembly

Also Published As

Publication number Publication date
FR1553220A (es) 1969-01-10
DE1556509A1 (de) 1970-01-29
FI45736B (es) 1972-05-31
GB1213586A (en) 1970-11-25
FI45736C (fi) 1972-09-11
ES349282A1 (es) 1969-04-01
NO120011B (es) 1970-08-10
NL6800566A (es) 1968-09-23
JPS5217958B1 (es) 1977-05-18
DE1556509B2 (de) 1974-03-07
CH461297A (de) 1968-08-15

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