Abstract:
PROBLEM TO BE SOLVED: To provide the optimum design for maximizing the allowable mistake alignment by connecting the torque to a driving shaft through an internal spline connection by the complementary engagement of spline teeth between the internal spline connection and an external crown spline connection. SOLUTION: An engine connection sub-assembly 63 includes a fastening fitting 64, a taper adapter, that is, a band pan 65, a ball bearing 66, an external crown spline connection 61, an internal spline connection 68 and a pin collar connector 69. The fastening fitting 64 is used for firmly fixing the engine connection sub-assembly 63 and a taper output shaft 54S of an engine. The fastening fitting 64 is mechanically mutually connected to the band pan 65. A center of a sprag clutch 62 is placed on an intermediate between the external crown spline connection 67 and the band pan 65 by means of the ball bearing 66. The external crown spline connection 67 is mechanically mutually connected to the internal spline connection 68.
Abstract:
PROBLEM TO BE SOLVED: To provide a rotor type unmanned aircraft which can be utilized for wide-range reconnaissance aviation, or communication mission and especially for tactical reconnaissance aviation. SOLUTION: An unmanned aircraft UAV has a composite annular fuselage structure 20 surrounding a rotary assembly 100 including a pair of co-axial multi-blade double reversing rotors. The annular fuselage structure 20 includes an annular C-type structure, and the annular C-type structure regulates a cavity and a freely removable panel structure fitted in combination with the annular C-type structure. The UAV has a drive train assembly including a sprag clutch, an engine connection sub-assembly, a transmission connection sub-assembly and a drive shaft.
Abstract:
PROBLEM TO BE SOLVED: To rotate upper and lower rotary shafts in the directions opposite to each other by providing upper and lower bevel gears and a UAV power device sub-system for connecting the torque to a counter-rotating rotor with a mechanically engageable input gear. SOLUTION: A single-stage transmission sub-system 120 has an input pinion gear 122. The input pinion gear 122 comprises a spline end 124, a bearing 126 for mounting the input pinion gear 122 rotatably connected to a transmission housing 140, and upper and lower spiral bevel gears 128, 130. The upper and lower spiral bevel gears 128, 130 are respectively provided with integrally formed upper and lower rotor shafts 128R, 130R, which dispenses with an independent rotor shaft connecting means. Upper and lower multiblade rotors are respectively combined with the rotor shafts 128R, 130R to be fixed.
Abstract:
PROBLEM TO BE SOLVED: To provide the optimum design for exercising the optimum performance by providing a bearing bolt connected with a cabin internal bulkhead to be inserted, and a rotatable mounting means by combining an external inner bulkhead, a spherical bearing, a spherical bearing in a bearing cavity, and a bracket. SOLUTION: This snubber assembly comprises a spherical bearing 232, a bearing bolt 234, a fastening nut, a snubber bracket 238 connected and fixed to the spherical bearing 232, and a fixing bolt 240. The combination of the spherical bearing 232 and the snubber bracket 238 is rotatably mounted in a bearing cavity by means of the bearing bolt 234. The bearing bolt 234 is inserted through a bolt hole, the spherical bearing 232 and a bolt hole. The bearing bolt 234 is connected in a rotor hub by the fastening nut and fixed. The fastening nut is engaged with the bearing bolt 234 to keep the stability to the internal bulkhead 223.
Abstract:
PROBLEM TO BE SOLVED: To provide a rotor type UAV used for a reconnaissance flight and a communication mission over a wide area, especially for a strategic reconnaissance flight. SOLUTION: A unmanned aerial vehicle(UAV) 10 has a complex circular body structure 20 surrounding a rotor assembly 100 including a pair of coaxial multi-blade counter-rotating rotors. The circular body structure 20 includes a circular C-shape structure. The circular C-shape structure defines a detachable panel structure mounted with a combination of a cavity and the circular C-shape structure. The UAV has a drive train assembly having a sprag clutch, an engine coupled subassembly, transmission coupled subassembly, and a drive shaft.
Abstract:
An unmanned aerial vehicle (UAV) (10) has a composite toroidal fuselage structure (20) that surrounds a rotor assembly (100) that includes pair of coaxial, multi-bladed, counter-rotating rotors (200, 202). The toroidal fuselage structure (20) includes an annular C-shaped structure (430) that defines an internal cavity (436) and removable panel structures (464) mounted in combination with the annular C-shaped structure (430). The UAV has a drive train assembly (60) that includes a sprag clutch (62), an engine coupling subassembly (63), a transmission coupling subassembly (74), and a drive shaft (72) operative to couple torque between the UAV engine (54) and the rotor assembly (100) and configured to maximize allowable axial, angular, and/or parallel misalignments therebetween. The UAV further includes a coaxial transmission/center hub assembly (110), an integrated spline/cone seat subassembly (190), rotor blade subassemblies including pretwisted inner flexbeams (260), and snubber assemblies (230).
Abstract:
An integrated spline/cone seat subassembly (190) for an unmanned aerial vehicle (10) having a rotor assembly (100) that includes ducted, counter-rotating rotors (200, 202), comprising:a rotor shaft (128R or 130R) having an axis, said rotor shaft (128R or 130R) includinga primary shaft portion (192) having a first diameter (D 1 ),an end shaft portion (194) having a second diameter (D 2 ) and having a plurality of shaft splines (198) extending radially outwardly therefrom, anda conic transition portion (196) intermediate said primary and end shaft portions (192, 194), said conic transition portion (196) making a predetermined angle (β) with respect to said axis of said rotor shaft (128R or 130R); anda rotor hub (204) having a centerline (212), said rotor hub (204) having a shaft aperture (206) having a plurality of hub splines (208) extending radially inwardly therefrom;said plurality of hub splines (208) and said plurality of shaft splines (198) being interleaved in combination to provide a rotational interlock between said rotor hub (204) and said rotor shaft (128R or 130R) in the rotor assembly (100); characterized in thateach of said hub splines (208) having an outwardly tapered lower portion (210) that makes a predetermined angle (θ) with respect to said centerline (212); andsaid predetermined angle (θ) of said outwardly tapered lower portions (210) of said hub splines (208) being equal to said predetermined angle (β) of said conic transition portion (196) of said rotor shaft (128R or 130R) wherein said tapered lower portions (210) of said hub splines (208) abuttingly engage and are mechanically supported by said conic transition portion (196) of said rotor shaft (128R or 130R) in the rotor assembly (100).
Abstract:
FIELD: aircraft manufacture; designing of combined bearing subunits for unmanned flying vehicles. SUBSTANCE: combined subunit includes upper or lower main rotors and bush embracing the respective shaft and coaxial with it; end portion of shaft and surface of bush embracing it are provided with many radial splines which are external splines for shaft and inner splines for bush; splines of shaft and bush are mutually alternating providing for engagement between shaft and bush for setting it in rotation. Main rotor shaft is provided with main and end cylindrical parts of different diameter: D1 and D2 with taper adapter portion formed between them at angle of inclination beta of surface relative to shaft axis. According to invention, each spline of bush has lower portion bevelled outside forming angle theta relative to axis of bush which is equal to angle beta of taper adapter portion of shaft of main rotor. Bush rests on taper adapter portion of respective shaft by its bevelled lower portions of splines. Distance D3 of such combined subunit between edges of splines of main rotor shaft may be equal to diameter Dl of its main portion in diametral plane. EFFECT: optimization of construction of subunit. 2 cl, 32 dwg.