CN104943853B - A kind of screw for being capable of reducing - Google Patents

A kind of screw for being capable of reducing Download PDF

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Publication number
CN104943853B
CN104943853B CN201510206285.9A CN201510206285A CN104943853B CN 104943853 B CN104943853 B CN 104943853B CN 201510206285 A CN201510206285 A CN 201510206285A CN 104943853 B CN104943853 B CN 104943853B
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CN
China
Prior art keywords
blade
scroll spring
reducing
base
screw
Prior art date
Application number
CN201510206285.9A
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Chinese (zh)
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CN104943853A (en
Inventor
席亮亮
宋笔锋
王海峰
陈声麒
刘成业
郭安
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西北工业大学
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Priority to CN201510206285.9A priority Critical patent/CN104943853B/en
Publication of CN104943853A publication Critical patent/CN104943853A/en
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Publication of CN104943853B publication Critical patent/CN104943853B/en

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    • Y02T50/44

Abstract

A kind of screw that can become oar footpath, has plane scroll spring in the middle part of base upper surface.The blade shank of each blade is respectively placed in the blade shank chute of the scroll spring both sides;Synchronizing bar is hinged on the end face of two blade shanks;The other end of each synchronizing bar is connected with the synchronous disk in the reducing lazy-tongs.Adapter sleeve is sleeved on the termination that each blade is hinged with described synchronizing bar one end, in the blade shank chute of base has slide rail.Synchronous disk is corresponding with the position of the plane scroll spring being placed in synchronous disk in the position of susceptor surface, and is sleeved in the interior connecting shaft of plane scroll spring.Linear bearing is set with one end of two blade shanks.During use of the present invention, screw has four kinds of states, and the centrifugal force size according to blade itself in rotary course controls the oar footpath size of screw, with simple structure and the characteristics of less energy consumption.

Description

A kind of screw for being capable of reducing

Technical field

The present invention relates to a kind of aircraft propulsion variant propeller mechanism, specifically a kind of variable-diameter Propeller mechanism.

Background technology

Because the atmospheric density in 20~30km high-altitudes is the 1/14~1/70 of sea level, propeller load operating mode in high-altitude and During low latitude, excursion is very big, and electric system is difficult to keep total power to match in the operating mode of wide variation with screw, deposits Poor-performing when according to the dynamical system of high altitude environment design in low latitude, according to the dynamical system of low latitude Environment Design in height The phenomenon of space-time poor performance.The reason for causing this present situation is the screw that current propulsion system is mostly fixed using oar footpath, In the case where motor max. output torque is limited, sea level propulsion system screw maximum (top) speed is the 1/3~1/8 of high-altitude maximum (top) speed Times, propulsion system low latitude thrust very little is caused, the power wretched insufficiency in low-latitude flying.Solve it is critical only that for this problem to carry High propeller efficiency and the scope of application in high low latitude, so as to thoroughly improve the performance of propulsion system.

In order that dirigible can adapt to high low latitude operating mode simultaneously, current HAA mostly adopts high-altitude and low latitude propulsion system The scheme united and deposit:High space-time uses high-altitude dynamical system scheme, and low latitude dynamical system scheme is used during low latitude.But it is this to push away Enter weight compensation and energy waste that system schema causes HAA very big, the overall performance of HAA can be reduced.Cause This, although this scheme can deal with the key technology flying demonstration of short time, for for a long time in empty (more than one month) Have little significance near space vehicle.

Feather and change oar footpath propeller propulsion system are a kind of technological approaches for preferably solving the problem, are adopted during low latitude With little oar footpath and little pitch propeller propulsion system, high space-time is using big oar footpath and big pitch propeller propulsion system.Using change Oar footpath screw can ensure that propulsion system, at utmost using energy, increases propulsion system thrust output.

Feather Propeller technology develops comparative maturity in helicopter field, but grinds in aerostatics research, tilting rotor Study carefully, field of wind power generation due to the restriction of range of travel, spiral cannot be allowed only by the pitch for changing screw Oar reaches higher efficiency under different operating modes.Thus spiral shell can be extended using oar footpath screw is become in these research fields The adjustable range of rotation oar, improves the adaptability under the efficiency and propulsion system difference operating mode of screw.

In prior art, there is a kind of diameter-variable propeller for being applied to aircraft, the screw will by feed screw nut Servomotor is converted to translation so as to realize the reducing of screw.The mechanism have be accurately controlled, simple structure etc. Feature, but need to increase servo control system, the weight cost paid for this is too big.

The content of the invention

In order to overcome existing active variable oar footpath screw to compensate the too big shortcoming of weight, the present invention proposes one kind can Become the screw in oar footpath.

The present invention includes two blades, propeller hub, plane scroll spring, synchronous disk, synchronizing bar and reducing lazy-tongs.Oar Hub is the carrier of the constraint mechanism and lazy-tongs, is bolted by upper lid and bottom seat and is constituted.In the upper of the base There is blade shank chute on surface;Plane scroll spring is laid in the middle part of the base upper surface.The blade shank of each blade is pacified respectively It is placed in the blade shank chute of the scroll spring both sides;Synchronizing bar in reducing lazy-tongs is hinged on the end of two blade shanks Face;The other end of each synchronizing bar is connected with the synchronous disk in the reducing lazy-tongs.Company in reducing constraint mechanism Female connector is sleeved on the termination that each blade is hinged with described synchronizing bar one end, symmetrical on the excircle of each adapter sleeve to be fixed with A pair of slide blocks, each slide block are coordinated with guide rail respectively.Described slide rail is located in the blade shank chute of base.The synchronous disk is in institute The position for stating susceptor surface is corresponding with the position of the plane scroll spring being placed in synchronous disk, and is sleeved on plane scroll spring In interior connecting shaft;Move between connecting shaft in the synchronous disk and plane scroll spring and coordinate.It is set with one end of two blade shanks There is linear bearing.

The reducing constraint mechanism of the blade include adapter sleeve, two limit springs, two decorative pearls on top of an official cap, two linear bearings, Two pairs of guide rails and two pairs of slide blocks;Blade shank is placed near base central cavity one end after the limit spring is affixed with the decorative pearl on top of an official cap In the mounting groove of limit spring and the decorative pearl on top of an official cap;Each two pairs of guide rails are separately fixed in the blade shank chute of described base upper surface, Two pairs of slide blocks are separately fixed on adapter sleeve and are coordinated with two pairs of guide rails respectively.

There are two spacing draw-in grooves, and each spacing draw-in groove respectively along each oar in each blade shank chute of the base The length direction distribution of petiole chute, defines interior spacing draw-in groove and outer spacing draw-in groove.

The base is housing shape, useful in the cavity for laying plane scroll spring in the middle part of which, is distinguished in the cavity both sides There is the blade shank supporting plate of extension, the cross section of the supporting plate is semicircle.Blade shank chute is provided with the plane of the supporting plate, should Blade shank chute extends along the length direction of the supporting plate.A pair of slide rails are separately installed with each blade shank chute.

The two ends of the plane scroll spring have connecting shaft respectively, define the interior connecting shaft of the plane scroll spring and outer Connecting shaft.There is the limiting stand of radially protruding in one end of the interior connecting shaft.

Present invention is generally directed to two-bladed porpeller, two blades can realize reducing and its principle is identical.The composition bag of system Include:Propeller hub, blade, plane scroll spring, reducing constraint mechanism and reducing lazy-tongs, wherein propeller hub are divided into base and upper lid two Part, blade are symmetrical, and reducing constraint mechanism includes outer spacing draw-in groove, interior spacing draw-in groove and the limit spring decorative pearl on top of an official cap, linear axis Hold, slide block, guide rail, reducing lazy-tongs include synchronous disk and two synchronizing bars.

The parts of the present invention and overall structural relation are:One end on the outside of plane scroll spring connects firmly and propeller hub base Central authorities, the plane scroll spring other end is connected with synchronous disk.Synchronizing bar one end is hinged with synchronous disk, the other end and propeller shank It is hinged.Two blades are symmetrical, and two auricles that propeller shank stretches out are bolted with slide block.The limit spring decorative pearl on top of an official cap and oar " recessed " cavity of blade root does piston type reciprocating motion.Draw-in groove is symmetrically distributed on base, spacing spring top bead during stable state Stretch out from cavity and enter draw-in groove.Four guide rails are individually fixed in base by screw rod, and slide block slides on guide rail.Linear bearing Outer ring is fixed Yu Jiang Grains by jump ring, and inner ring is enclosed within propeller shank.

The present invention realizes that the technical scheme that the change of screw oar footpath is adopted is:With the increase of revolution speed of propeller, blade is certainly Body produce centrifugal force be also continuously increased, when centrifugal force overcomes reducing resistance, the resistance include the limit spring decorative pearl on top of an official cap with it is recessed Between groove along oar footpath direction directed force F1, plane scroll spring pulling force F2, blade starts to be changed into big oar footpath from little oar footpath state State, when blade oar footpath is to big oar footpath state, its limited spring top bead is again locked.When rotating speed declines to a certain extent, Centrifugal force and F1The restoring force that sum is produced less than plane scroll spring, blade start to be recovered to little oar footpath shape by big oar footpath state State.

During use of the present invention, screw has four kinds of states, the centrifugal force size of foundation blade itself in rotary course The oar footpath size of control screw.It is an advantage of the invention that:

1st, simple structure:Servomotor and controller are reduced than general active control mechanism, diameter changing mechanism is alleviated Weight.

2nd, less energy consumption:Due to adopting the self-driven diameter changing mechanism based on centrifugal force, during reducing system is not needed to carry For extra energy, energy resource system loss is effectively reduced, energy resource system weight is reduced.

Description of the drawings

Fig. 1 is the appearance schematic diagram of the present invention;

Fig. 2 is the structural representation for removing upper lid;

Fig. 3 is the front view for removing upper lid

Fig. 4 is the sectional view of Fig. 3;

Fig. 5 is the cooperation schematic diagram between blade, synchronizing bar, synchronous disk and nest coil spring;

The partial enlarged drawing in Tu6Shi Tu3Zhong B areas;

Fig. 7 is the C-C direction views of Fig. 3;

Fig. 8 is the schematic diagram of propeller shank, and wherein 8a is front view, and 8b is the D-D direction views of 8a, 8c be 8a E-E to View;

Fig. 9 is the top view of nest coil spring;

Figure 10 is the front view of Fig. 9;

Figure 11 is the top view of synchronous disk.In figure:

1. blade shank;2. cover on;3. base;4. adapter sleeve;5. synchronizing bar;6. synchronous disk;7. bolt;8. slide block;9. lead Rail;10. linear bearing;11. outer spacing draw-in grooves;12. plane scroll springs;13. limit springs;14. decorative pearls on top of an official cap;Limiting card in 15. Groove;16. blade cavitys;Connecting shaft in 17.;18. outer connecting shafts.

Specific embodiment

Present invention is generally directed to a kind of diameter changing mechanism of two blade propellers, including two blades, propeller hub, plane scroll bullets Spring 12, reducing constraint mechanism and reducing lazy-tongs.The reducing constraint mechanism of the blade include limit spring 13, the decorative pearl on top of an official cap 14, Interior spacing draw-in groove 15, outer spacing draw-in groove 11, linear bearing 10, guide rail 9 and slide block 8, the reducing lazy-tongs include synchronous disk 6 With two synchronizing bars 5.

Propeller hub is the carrier of the constraint mechanism and lazy-tongs, is bolted and is constituted by upper lid 2 and base 3. The center of 3 length direction of the base has for laying the cavity of plane scroll spring 12, and the plane scroll spring is placed in In the cavity.The blade shank 1 of two blades is respectively placed in the blade shank chute of 3 central cavity both sides of the base;Two The end face of individual blade shank has been respectively articulated with the synchronizing bar 5;The other end of each synchronizing bar passes through bolt with the synchronous disk 6 respectively Connection.The termination that synchronizing bar one end is hinged with each blade is set with adapter sleeve 4, symmetrical on the excircle of each adapter sleeve to consolidate Surely there are a pair of slide blocks, the lower surface of each slide block has the chute coordinated with slide rail respectively.Described slide rail is located at the blade shank of base 3 In chute.

The position of position of the synchronous disk 6 on 3 surface of the base and the plane scroll spring being placed in synchronous disk Correspondence, and be sleeved in plane scroll spring in connecting shaft;Move between connecting shaft in the synchronous disk 6 and plane scroll spring and match somebody with somebody Close.

The blade of the blade is respectively outside the blade shank chute of 3 central cavity both sides of the base.

The installation of limited location spring 13 and the decorative pearl on top of an official cap 14 is distinguished near 3 central cavity one end of base in described two blade shanks 1 Groove, when installing the limit spring 13 and the decorative pearl on top of an official cap 14, makes limit spring 13 be located at the bottom land of the mounting groove, is placed in the decorative pearl on top of an official cap 14 The notch of the mounting groove;Fit with the inner face of the decorative pearl on top of an official cap 14 outer face of limit spring 13.

There are two spacing draw-in grooves, and each spacing draw-in groove respectively along each oar in each blade shank chute of the base The length direction distribution of petiole chute, defines interior spacing draw-in groove 15 and outer spacing draw-in groove 11.

After described two blade shanks 1 make the oar footpath of screw reach required diameter along base movement respectively, it is mounted in each The decorative pearl on top of an official cap 14 on blade shank is entered in the interior spacing draw-in groove 15 or outer spacing draw-in groove 11, and is held out against by limit spring 13.

Linear bearing 10 is set with one end of two blade shanks, and the outer ring of the linear bearing is made by jump ring and bottom Seat 3 is fixed.

The base 3 is housing shape, useful in the cavity for laying plane scroll spring 12 in the middle part of which, in the cavity both sides point There is not the blade shank supporting plate of extension, the cross section of the supporting plate is semicircle.Blade shank chute is provided with the plane of the supporting plate, The blade shank chute extends along the length direction of the supporting plate.A pair of slide rails are separately installed with each blade shank chute.

The plane scroll spring 12 is to obtaining after prior art improvement.The two ends difference of the plane scroll spring There is connecting shaft, define the interior connecting shaft 17 and outer connecting shaft 18 of the plane scroll spring.In one end of the interior connecting shaft 17 There is the limiting stand of radially protruding, and the external peripheral surface of the end at the end is flank.During assembling, by synchronous disk 12 Heart borehole jack is mounted in interior connecting shaft 17 flank one end, and makes an end face of the synchronous disk and the end face pair of described limiting stand Should;Nut is installed in the termination of interior connecting shaft, the axial location of the synchronous disk is limited by the limiting stand and nut.It is interior There is deep groove ball bearing between connecting shaft 17 and synchronous disk 6, the frictional force produced during reducing and relatively rotate between the two.

The cylindrical weekly form on 18 top of outer connecting shaft is flank.Outer connecting shaft pass through synchronous disk, and with the synchronous disk Between be fitted close;Nut is installed on the flank of the outer connecting shaft, to limit the axial location of the outer connecting shaft.When same Step disk rotate around interior connecting shaft when, by outer connecting shaft 18 drive plane scroll spring 12 rotate.

The profile of the decorative pearl on top of an official cap 14 is in "convex" shaped.The larger diameter end of the decorative pearl on top of an official cap is coordinated with limit spring 13;The decorative pearl on top of an official cap Smaller diameter end is coordinated with the spacing draw-in groove in each blade shank chute.The outer surface of the end of the decorative pearl on top of an official cap smaller diameter end is oblique Face.In spacing draw-in groove in matched each blade shank chute, the side side wall of groove is also inclined-plane, facilitating the decorative pearl on top of an official cap to enter or Skid off spacing draw-in groove.

Blade is symmetrical a pair, and blade is broadly divided into three parts, produces the blade handle portion 1 of aerodynamic force, with slide block 8 The adapter sleeve 4 being connected, also accommodates the blade cavity 16 of constraint limit spring 13 and the motion of the decorative pearl on top of an official cap 14.

The reducing constraint mechanism of blade includes the limit spring 13, decorative pearl on top of an official cap 14, interior spacing draw-in groove 15, outer spacing draw-in groove 11, straight Bobbin holds 10, guide rail 9, slide block 8, wherein every kind of draw-in groove has two and is symmetrically distributed in the both sides of propeller hub base 3, limit spring 13 are connected with the decorative pearl on top of an official cap 14, by the limit spring 13 and the decorative pearl on top of an official cap 14, are formed stable reciprocating motion with blade cavity 16, are worked as oar Leaf move to the position of requirement and in stable state when, among the decorative pearl on top of an official cap 14 stretches out and snaps in draw-in groove, 10 outer ring of linear bearing leads to Cross jump ring to fix Yu Jiang Grains, inner ring is enclosed within propeller shank, translation pair is formed between blade.Guide rail 9 and slide block 8 have four respectively Individual, guide rail 9 is fixed on base 3 by screw rod, and slide block 8 is connected firmly with adapter sleeve 4 while constituting translation pair with guide rail 9.Reducing is same Step mechanism is made up of 6, two synchronizing bars 5 of synchronous disk and bolt 7.One end on the outside of plane scroll spring 12 connects firmly and propeller hub base 3, its other end is connected with synchronous disk 6.5 one end of synchronizing bar is hinged with synchronous disk 6, and the other end is hinged with propeller shank.Such as Fig. 9 and Shown in Figure 10, respectively have inside and outside special nest coil spring 12 two for connection pillar, outside pillar cut with scissors with synchronous disk 6 Chain, inner side pillar one end are fixed on base 3, and the other end is caused synchronous disk 6 to be formed with inner side pillar and rotates secondary.Special nest volume bullet Hole of 12 inside and outside two connecting shafts of spring through 6 center of synchronous disk so that synchronous disk 6 can only be produced and be rotated around interior connecting shaft.It is synchronous Disk 6 is hinged with synchronizing bar 5 by two apertures.

By the present embodiment, blade oar footpath can be realized from minimum to maximum change:

During minimum oar footpath:

When static, limit spring 13 is in pressured state, and which promotes the decorative pearl on top of an official cap 14 to stretch out from blade cavity, and makes the decorative pearl on top of an official cap 14 Among snapping in interior spacing draw-in groove 15.When the rotating speed of screw is started from scratch increase, the centrifugal force that blade is produced makes which have what is thrown away Trend, causes to play the role of between the decorative pearl on top of an official cap 14 and interior spacing draw-in groove 15 mutual, and then compresses limit spring 13.In revolution speed of propeller During less than certain threshold values, limit spring 13 can not be compressed to most short by the power of this interaction, and the decorative pearl on top of an official cap 14 also cannot Eject from interior spacing draw-in groove 15, therefore blade keeps little oar footpath state.

When oar footpath becomes big:

When the rotating speed of screw reaches certain threshold values, limit spring 13 is compressed into very short, and now the decorative pearl on top of an official cap 14 is from interior limit Eject in the draw-in groove 15 of position, the pulling force of the centrifugal force of blade itself more than plane scroll spring, thus blade along guide rail 9 direction to Outer motion.The trend that any one in two blades has diameter change can all drive synchronous disk to produce the trend of rotation, until When another blade reaches reducing condition, mechanism just starts reducing.

During maximum oar footpath:

After completing to become big footpath state, when blade is got rid of to big oar path position, the elastic force that the compression of limit spring 13 is produced will can be pushed up Pearl 14 is pushed in outer spacing draw-in groove, and now blade keeps big oar footpath state.Ramp angles on the outside of outer spacing draw-in groove are 90 degree, Before failure mechanisms, no matter how centrifugal force increases diameter of propeller blade will not also become big.

Oar footpath becomes hour:

When the rotating speed of screw is reduced to certain threshold values, limit spring 13 is compressed to very short, and now the decorative pearl on top of an official cap 14 is from outer Spacing draw-in groove is hit by a bullet out, and the centrifugal force of blade itself is less than the pulling force of plane scroll spring, therefore blade is received along the direction of guide rail 9 Contracting.The trend that any one in two blades has diameter change can all drive synchronous disk to produce the trend of rotation, until another When individual blade reaches reducing condition, mechanism just starts reducing.The decorative pearl on top of an official cap 14 is snapped at interior spacing draw-in groove 15, and blade recovers to little oar footpath State.

Claims (5)

1. a kind of screw that can become oar footpath, including two blades and propeller hub, it is characterised in that also including plane scroll bullet Spring, reducing constraint mechanism and reducing lazy-tongs;
Propeller hub includes lid and bottom seat, is the carrier of the reducing constraint mechanism and reducing lazy-tongs;In the upper of the base There is blade shank chute on surface;Plane scroll spring is laid in the middle part of the base upper surface;The blade shank of each blade is pacified respectively It is placed in the blade shank chute of the plane scroll spring both sides;Synchronizing bar in reducing lazy-tongs is hinged on two blade shanks End face;The other end of each synchronizing bar is connected with the synchronous disk in the reducing lazy-tongs;Company in reducing constraint mechanism Female connector is sleeved on the termination that each blade is hinged with described synchronizing bar one end, symmetrical on the excircle of adapter sleeve to be fixed with a pair of cunnings Block, the lower surface of each slide block have the chute coordinated with slide rail respectively;Described slide rail is located in the blade shank chute of base;It is described Synchronous disk is corresponding with the position of the plane scroll spring being placed in synchronous disk in the position of the susceptor surface, and is sleeved on flat In the scroll spring of face in connecting shaft;Move between connecting shaft in the synchronous disk and plane scroll spring and coordinate;In two blade shanks One end is set with linear bearing.
2. the screw in oar footpath can be become as claimed in claim 1, it is characterised in that the reducing constraint mechanism of the blade includes Adapter sleeve, two limit springs, two decorative pearls on top of an official cap, two linear bearings, two pairs of guide rails and two pairs of slide blocks;The limit spring and top Blade shank is placed in after pearl is affixed in the mounting groove of the limit spring and the decorative pearl on top of an official cap of base central cavity one end;Two pairs of guide rails point Be not fixed in the blade shank chute of described base upper surface, two pairs of slide blocks be separately fixed on adapter sleeve and respectively with two pairs Guide rail coordinates.
3. the screw in oar footpath can be become as claimed in claim 1, it is characterised in that in each blade shank chute of the base There are two spacing draw-in grooves respectively, and each spacing draw-in groove is distributed along the length direction of each blade shank chute, defines interior limit Position draw-in groove and outer spacing draw-in groove.
4. the screw in oar footpath can be become as claimed in claim 1, it is characterised in that have in the middle part of the base for laying plane The cavity of scroll spring, has the blade shank supporting plate of extension respectively in the cavity both sides, and the cross section of the supporting plate is semicircle;Institute State, the blade shank chute extends along the length direction of the supporting plate;Slide in blade shank A pair of slide rails are separately installed with groove.
5. the screw in oar footpath can be become as claimed in claim 1, it is characterised in that the two ends difference of the plane scroll spring There is connecting shaft, define the interior connecting shaft and outer connecting shaft of the plane scroll spring;Have radially in one end of the interior connecting shaft The limiting stand of protrusion.
CN201510206285.9A 2015-04-27 2015-04-27 A kind of screw for being capable of reducing CN104943853B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510206285.9A CN104943853B (en) 2015-04-27 2015-04-27 A kind of screw for being capable of reducing

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Application Number Priority Date Filing Date Title
CN201510206285.9A CN104943853B (en) 2015-04-27 2015-04-27 A kind of screw for being capable of reducing

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CN104943853B true CN104943853B (en) 2017-04-05

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105523181B (en) * 2016-01-15 2017-12-26 珠海市磐石电子科技有限公司 The rotor and its aircraft of a kind of variable-diameter
CN105620728B (en) * 2016-02-26 2017-08-11 西北工业大学 It is a kind of to become the propeller of oar footpath pitch
CN107349819A (en) * 2017-09-09 2017-11-17 马千里 A kind of starch from sweet potato agitating paddle
CN107972862A (en) * 2017-11-21 2018-05-01 歌尔科技有限公司 Load-carrying control method, equipment and unmanned plane based on unmanned plane

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US5655879A (en) * 1995-03-28 1997-08-12 Sikorsky Aircraft Corporation Mounting arrangement for variable diameter rotor blade assemblies
CN102649476A (en) * 2011-02-28 2012-08-29 波音公司 Disc rotor retraction system
CN103010456A (en) * 2012-09-21 2013-04-03 中国空间技术研究院 Novel variable-diameter variable-pitch propeller
CN203567926U (en) * 2013-11-26 2014-04-30 无锡市明珠烤漆厂 Vertical-lifting low-altitude civil rotary-wing aircraft roof propeller structure

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US9068818B2 (en) * 2010-02-24 2015-06-30 Sikorsky Aircraft Corporation Drive mechanisms for variable diameter rotor systems

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Publication number Priority date Publication date Assignee Title
US5655879A (en) * 1995-03-28 1997-08-12 Sikorsky Aircraft Corporation Mounting arrangement for variable diameter rotor blade assemblies
CN102649476A (en) * 2011-02-28 2012-08-29 波音公司 Disc rotor retraction system
CN103010456A (en) * 2012-09-21 2013-04-03 中国空间技术研究院 Novel variable-diameter variable-pitch propeller
CN203567926U (en) * 2013-11-26 2014-04-30 无锡市明珠烤漆厂 Vertical-lifting low-altitude civil rotary-wing aircraft roof propeller structure

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