CN113212747B

CN113212747B - Propeller tilting mechanism of fixed wing aircraft

Info

Publication number: CN113212747B
Application number: CN202110537443.4A
Authority: CN
Inventors: 刘行伟; 胡旭; 何海强
Original assignee: Zhejiang Honghuyi Aviation Technology Co ltd
Current assignee: Zhejiang Honghuyi Aviation Technology Co ltd
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2023-05-16
Anticipated expiration: 2041-05-18
Also published as: CN113212747A

Abstract

The invention provides a propeller tilting mechanism of a fixed-wing aircraft, and belongs to the technical field of aircrafts. The technical problems that the existing propeller is directly driven through a gear in tilting, the contact area is small, the stability and the control precision are poor and the like are solved. The screw tilting mechanism of the fixed wing aircraft comprises a screw mounting seat and a screw mounting seat, wherein the upper end part of a connecting plate fixed at the front end of the screw mounting seat is hinged and fixed with the screw mounting seat through a first hinge shaft, a driving piece is arranged at the rear end of the screw mounting seat, a screw nut is arranged on a tilting screw arranged in the screw mounting seat, and the screw nut drives the screw mounting seat to rotate around the first hinge shaft through a connecting rod. According to the tilting mechanism of the propeller, the tilting screw rod is matched with the connecting rod, so that the linear motion is changed into the angular motion, the tilting of the propeller assembly is realized, the contact area is larger, the vibration resistance is improved, the influence on the tilting mechanism caused by the operation of the propeller assembly can be reduced, and the control stability and precision are higher.

Description

Propeller tilting mechanism of fixed wing aircraft

Technical Field

The invention belongs to the technical field of aircrafts, and particularly relates to a propeller tilting mechanism of a fixed-wing aircraft.

Background

In the intelligent era, the unmanned aerial vehicle industry is a hot spot of a new technological revolution and industrial revolution worldwide, and is rapidly developed as an important branch of aviation manufacturing industry. The conventional unmanned aerial vehicle adopts a running take-off and landing mode to realize take-off and landing of the unmanned aerial vehicle, and has high dependence on a runway. By adopting the engine thrust steering technology, short-distance take-off or vertical take-off and vertical landing are realized, compared with the conventional aircraft under the same weight condition, the aircraft has the advantages of lower ground speed, shorter running distance, less time for completing take-off, getting rid of dependence on airfield runways and having high economic application value. Accordingly, a propeller tilting mechanism is needed to implement engine thrust steering techniques.

The invention of application number "201620168162.0" discloses an unmanned aerial vehicle propeller tilting mechanism, including the tilting shaft of the wing tip fixedly connected to wing, mounting plate and screw device and tilting device that are set up on the tilting shaft, the screw device includes the motor and propeller that is connected by the motor drive, the motor is fixed on mounting plate; the tilting device comprises a tilting steering engine, wherein the tilting steering engine is fixed on a mounting plate, a motor is positioned above a tilting shaft, the tilting steering engine is positioned below the tilting shaft, and the tilting steering engine drives the tilting shaft to move so as to drive the mounting plate to synchronously rotate.

Although the unmanned aerial vehicle propeller tilting mechanism can control the propeller tilting, the unmanned aerial vehicle propeller needs to be kept after tilting, and the propeller can continuously rotate under the drive of a motor in the keeping process, and the tilting of the propeller can be realized in a gear transmission mode, but the control precision is lower; meanwhile, when the tilting angle of the propeller is maintained through the gears, the contact surface of the gears is narrower when the two gears are meshed, so that the influence of vibration or shaking generated when the propeller rotates and the motor works on the gears is larger, the stability of connection is poor, and the control precision is low due to abrasion of the gears.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide the propeller tilting mechanism of the fixed wing aircraft, which has higher control precision and better control stability.

The aim of the invention can be achieved by the following technical scheme:

the utility model provides a fixed wing aircraft's screw mechanism of turning over, includes the screw subassembly, the screw subassembly is fixed in on the screw mount pad, its characterized in that: the device comprises a tilting screw, wherein the tilting screw is longitudinally and rotatably arranged on a screw mounting seat, the front end of the screw mounting seat is fixedly connected with a connecting plate, the upper end of the connecting plate is hinged with the upper end of the screw mounting seat through a first hinge shaft which is transversely arranged, the rear end of the screw mounting seat is provided with a driving piece which is used for driving the tilting screw to rotate, the tilting screw is provided with a screw nut which is meshed with the tilting screw and can move forwards and backwards along with the rotation of the tilting screw, and the screw nut drives the screw mounting seat to rotate around the first hinge shaft through a connecting rod which is hinged with the screw nut; the connecting rod is positioned between the first hinge shaft and the tilting screw rod; the front end of the connecting rod is hinged with the propeller mounting seat, the tilting screw rod and the hinged position of the connecting rod and the propeller mounting seat are both positioned below the first hinge shaft, and the front side surface of the connecting plate is arranged in a front-high and rear-low inclined mode.

According to the propeller tilting mechanism, the tilting screw rod and the connecting rod are matched to drive the propeller mounting seat to rotate around the first hinge shaft, so that tilting of the propeller assembly fixed on the propeller mounting seat is realized, and the tilting screw rod and the connecting rod are driven to replace a gear driving mode; meanwhile, the linear motion of the screw nut on the tilting screw is converted into the rotary motion of the screw mounting seat, the driving piece is used for controlling the rotation torque of the tilting screw around the shaft, the bearing capacity of the tilting screw can be greatly improved, and compared with the control mode that the rotation angle of the screw mounting seat is the same as that of the driving gear when the driving gear is directly connected, the screw tilting mechanism has the advantages of larger bearing torque, higher control precision, better dynamic/static stability, lower requirement on the driving piece, no need of selecting an ultra-high-precision motor, realization of control requirement and contribution to reduction of production cost; further, the stress of the propeller assembly is applied to the screw nut through the connecting rod, only a small part of the stress is converted into the force for driving the tilting screw to rotate, the tilting screw can be fixed only through the self-locking structure inside the driving piece, the stability of the tilting control of the propeller is improved, the requirement on the self-locking function of the tilting mechanism of the propeller is reduced, and the production cost is reduced.

In the above-mentioned screw tilting mechanism of fixed wing aircraft, be equipped with on the lead screw mount pad with tilting the guide way of lead screw parallel, fixedly connected with protrusion in the guide pin of lead screw nut lateral wall on the lead screw nut, the outer tip of guide pin is located the guide way and can follow the guide way and reciprocate.

This screw mechanism of turning over sets up the guide way and sets up the matched with guide pin on screw nut on through the lead screw mount pad, not only can turn over the rotary motion of screw into screw nut's rectilinear motion through restriction screw nut rotation, can also make screw nut more stable along the in-process that the screw moved forward and backward of turning over, does not take place to deflect, is favorable to improving the stability and the control accuracy of this screw mechanism control of turning over.

In the propeller tilting mechanism of the fixed wing aircraft, the front end and the rear end of the connecting rod are respectively provided with the front hinge part and the rear hinge part, the rear side surface of the propeller mounting seat is provided with the upper hinge part, the front hinge part and the upper hinge part are hinged through the second hinge shaft which is transversely arranged, the upper end of the screw nut is provided with the lower hinge part, the rear hinge part and the lower hinge part are hinged through the third hinge shaft which is transversely arranged, and the central axes of the front hinge part, the rear hinge part, the lower hinge part, the upper hinge part, the tilting screw and the screw mounting seat are all positioned in the same vertical plane.

The central axes of the front hinging part, the rear hinging part, the lower hinging part, the upper hinging part, the tilting screw and the screw rod mounting seat are all positioned in the same vertical plane, namely, the tilting mechanism of the screw propeller is symmetrically arranged on the left and right sides of the vertical plane, and the design can avoid deformation of parts caused by unilateral stress during working, so that the tilting mechanism of the screw propeller still has better stability and precision after long-time working; further, one of the front hinge part and the upper hinge part comprises two positioning plates which are arranged in parallel, the other one of the front hinge part and the upper hinge part can be inserted between the two positioning plates and hinged through a second hinge shaft, the other one of the rear hinge part and the lower hinge part comprises two positioning plates which are arranged in parallel, the other one of the rear hinge part and the lower hinge part can be inserted between the two positioning plates and hinged through a third hinge shaft, the connecting structures of the front hinge part, the upper hinge part, the rear hinge part and the lower hinge part can enable the connecting part to be bilaterally symmetrical, the situation that single-side stress does not exist in the transmission process is ensured, and the stability and the control precision of the control of the propeller tilting mechanism are improved.

In the above-mentioned screw tilting mechanism of fixed wing aircraft, the equal fixedly connected with mounting panel in left and right sides of screw mount pad trailing flank, first articulated shaft transversely runs through the mounting panel and with mounting panel fixed connection, the cover is equipped with the sleeve that can rotate relative first articulated shaft on the first articulated shaft, the connecting plate has two respectively and the upper end of two connecting plates all with sleeve fixed connection.

The connecting plate in the propeller tilting mechanism is connected with the first hinge shaft through the sleeve, and the contact area with the first hinge shaft is increased relative to the connecting plate, so that the connecting plate and the first hinge shaft are more stable in rotation after being connected, and the connecting part is not easy to deform even after long-time use, thereby being beneficial to improving the stability and the precision of the propeller tilting mechanism; further, not only can be convenient for screw mount pad link to each other with first articulated shaft after increasing the mounting panel, can also strengthen the structural strength of screw mount pad, be favorable to improving the life of this screw mount pad.

In the above-mentioned fixed wing aircraft's screw tilting mechanism, the cover is equipped with two bearings on the first articulated shaft, telescopic both ends all are equipped with the step face that is used for installing the bearing, all are equipped with the spacing ring between every bearing and the mounting panel that corresponds, the both ends face of spacing ring is supported with bearing and mounting panel respectively and is leaned on.

The design of above-mentioned bearing can make the sleeve rotate more smoothly for first articulated shaft, and the design of spacing ring not only can prescribe a limit to the position of bearing, makes the bearing can more firm install on telescopic step face, can also carry out spacing to telescopic position, avoids the sleeve to follow the axis direction left and right movement of first articulated shaft, is favorable to improving the stability that sleeve and first articulated shaft are connected, improves this screw tilting mechanism's control accuracy.

In the screw tilting mechanism of the fixed wing aircraft, the left side and the right side of the rear side of the screw mounting seat are fixedly connected with mounting plates, the upper ends of the two connecting plates are fixedly connected with first hinge shafts, the two first hinge shafts are coaxially arranged, through holes for the first hinge shafts to pass through are formed in the mounting plates, the first hinge shafts are connected with the mounting plates through bearings fixed in the through holes, and mounting nuts for transversely fixing the first hinge shafts are arranged at the outer end parts of the first hinge shafts.

As another connection scheme of the propeller installation seat and the connecting plate, the design can enable the propeller installation seat and the connecting plate to be firmly connected and rotate relatively.

In the propeller tilting mechanism of the fixed wing aircraft, the mounting plate is in an ear shape with a big upper part and a small lower part, and the front side surface of the connecting plate is arranged in a front high and rear low inclined way.

The mounting plates with large upper part and small lower part are matched with the connecting plates which are obliquely arranged, so that the propeller mounting seat is prevented from being in direct contact with the screw rod mounting seat, and the two are prevented from being mutually influenced; simultaneously, can also provide bigger angle of inclination for screw mount pad, make its angle that can rotate be greater than 90 degrees, make this screw mechanism of overturning have better adaptability.

In the above-mentioned screw tilting mechanism of fixed wing aircraft, screw drive assembly includes screw and driving motor, screw and driving motor's drive shaft fixed connection, driving motor is fixed in the front end of screw mount pad.

Above-mentioned driving motor is fixed in on the screw mount pad and directly links to each other with the screw, makes driving motor and screw can follow screw mount pad synchronous rotation, avoids because the rotation of screw mount pad leads to the fact the influence to being connected between driving motor and the screw, is favorable to improving this screw tilting mechanism's stability.

In the above-mentioned propeller tilting mechanism of fixed wing aircraft, the left and right sides of lead screw mount pad downside all is equipped with two at least mounting holes, the mounting hole bilateral symmetry sets up.

The screw rod mounting seats can be firmly fixedly connected with the aircraft through the symmetrically arranged mounting holes, so that the situation that the screw rod mounting seats are not firmly connected to cause the whole deflection of the screw rod tilting mechanism is avoided, and the stability and the control precision of the screw rod tilting mechanism are improved.

In the above-mentioned propeller tilting mechanism of fixed wing aircraft, the rear end of screw rod mount pad is equipped with the shaft coupling, the driving piece passes through the shaft coupling and links to each other with tilting screw rod.

Compared with the prior art, the invention has the technical effects that:

1. according to the propeller tilting mechanism, the tilting screw rod and the connecting rod are matched to drive the propeller mounting seat to rotate around the first hinge shaft, so that tilting of the propeller assembly fixed on the propeller mounting seat is realized, and the tilting screw rod and the connecting rod are driven to replace a gear driving mode;

2. the screw tilting mechanism converts the linear motion of the screw nut on the tilting screw into the rotary motion of the screw mounting seat, and the driving piece is used for controlling the rotation torque of the tilting screw around the shaft, so that the bearing capacity of the screw tilting mechanism can be greatly improved;

3. the screw nut is fixed only by the self-locking structure inside the driving piece, so that the stability of the screw tilting control is improved, the requirement on the self-locking function of the screw tilting mechanism is reduced, and the production cost is reduced.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic diagram showing a connection structure between a screw nut and a propeller mount according to the present invention.

Fig. 3 is a top view of the present invention.

Fig. 4 is a cross-sectional view at a first hinge shaft of the present invention.

Fig. 5 is a second cross-sectional view of the present invention at the first hinge shaft.

Fig. 6 is a schematic structural view of the propeller mount of the present invention.

Fig. 7 is a schematic view of the structure of the screw mounting base of the present invention.

Fig. 8 is a cross-sectional view of the present invention.

Fig. 9 is a second schematic diagram of the connection structure of the screw nut and the propeller mount of the present invention.

FIG. 10 is a schematic diagram of the connection at the reduction gear set of the present invention.

In the figure, 1, a propeller driving assembly; 11. a propeller; 12. a driving motor; 2. a propeller mounting seat; 21. an upper hinge part; 22. a mounting plate; 221. a through hole; 23. installing a nut; 3. a screw rod mounting seat; 31. a connecting plate; 32. a first hinge shaft; 33. a driving member; 34. a guide groove; 35. a sleeve; 351. a bearing; 352. a step surface; 36. a limiting ring; 37. a mounting hole; 4. tilting the lead screw; 5. a lead screw nut; 51. a guide pin; 52. a lower hinge part; 6. a connecting rod; 61. a front hinge; 62. a rear hinge; 63. a second hinge shaft; 64. a third hinge shaft; 7. a coupling; 8. a reduction gear set.

Detailed Description

The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

The screw tilting mechanism of the fixed wing aircraft comprises a screw mounting seat 2 for fixing a screw 11 assembly and a screw mounting seat 3 for mounting a tilting screw 4, wherein the tilting screw 4 is longitudinally rotatably mounted on the screw mounting seat 3, the front end of the screw mounting seat 3 is fixedly connected with a connecting plate 31, the upper end of the connecting plate 31 is hinged with the upper end of the screw mounting seat 2 through a first hinge shaft 32 which is transversely arranged, the rear end of the screw mounting seat 3 is provided with a driving piece 33 for driving the tilting screw 4 to rotate, the tilting screw 4 is provided with a screw nut 5 which is meshed with the tilting screw 4 and can move forwards and backwards along with the rotation of the tilting screw 4, and the screw nut drives the screw mounting seat 2 to rotate around the first hinge shaft 32 through a connecting rod 6 which is hinged with the screw nut. According to the propeller tilting mechanism, the tilting screw 4 and the connecting rod 6 are matched to drive the propeller mounting seat 2 to rotate around the first hinge shaft 32, so that tilting of a propeller 11 assembly fixed on the propeller mounting seat 2 is realized, and the tilting screw 4 and the connecting rod 6 are driven to replace a gear driving mode, so that the tilting screw 4 and the screw nut 5 are connected through threads, the contact area is larger, the vibration resistance is greatly improved, the influence on the tilting mechanism caused by the operation of the propeller 11 assembly can be reduced as much as possible, and the control stability is better; meanwhile, the linear motion of the screw nut 5 on the tilting screw 4 is converted into the rotary motion of the screw mounting seat 2, the driving piece 33 is used for controlling the tilting screw 4 to rotate around the shaft, the bearing capacity of the tilting screw is greatly improved, and compared with a control mode that the rotating angle of the screw mounting seat 2 is the same as that of a driving gear when the driving gear is directly connected, the screw tilting mechanism has the advantages of larger bearing moment, higher control precision and better dynamic/static stability, meanwhile, the requirement on the driving piece 33 is lower, the control requirement can be realized without selecting an ultra-high-precision motor, and the production cost is reduced; further, the stress of the propeller 11 assembly is applied to the screw nut 5 through the connecting rod 6, only a small part of the stress is converted into the force for driving the tilting screw 4 to rotate, and the tilting screw 4 can be fixed only through the self-locking structure inside the driving piece 33, so that the stability of the propeller tilting control is improved, the requirement on the self-locking function of the propeller tilting mechanism is reduced, and the production cost is reduced.

The working principle of the propeller tilting mechanism is as follows: when the screw rod tilting device works, the driving piece 33 drives the tilting screw rod 4 to rotate, the rotation of the tilting screw rod 4 drives the screw rod nut 5 in threaded connection with the tilting screw rod 4 to move back and forth along the tilting screw rod 4, and the back and forth movement of the tilting screw rod 4 drives the screw rod mounting seat 2 to rotate up and down around the first hinge shaft 32 through the connecting rod 6, so that tilting of the screw rod 11 fixed on the screw rod mounting seat 2 is realized. The driving member 33 is a stepping motor or a servo motor, and preferably a stepping motor is selected.

As shown in fig. 1, the propeller driving assembly 1 includes a propeller 11 and a driving motor 12, the propeller 11 is fixedly connected with a driving shaft of the driving motor 12, and the driving motor 12 is fixed on a front side surface of the propeller mounting seat 2. The driving motor 12 is fixed on the propeller mounting seat 2 and is directly connected with the propeller 11, so that the driving motor 12 and the propeller 11 can synchronously rotate along with the propeller mounting seat 2, the influence on the connection between the driving motor 12 and the propeller 11 caused by the rotation of the propeller mounting seat 2 is avoided, and the stability of the propeller tilting mechanism is improved.

As shown in fig. 2 and 7, the screw mounting seat 3 is provided with a guide groove 34 parallel to the tilting screw 4, the screw nut 5 is fixedly connected with a guide pin 51 protruding from the outer side wall of the screw nut 5, and the outer end of the guide pin 51 is located in the guide groove 34 and can move back and forth along the guide groove 34. This screw mechanism of turning over sets up guide slot 34 and sets up complex guide pin 51 on screw nut 5 through lead screw mount pad 3, not only can turn over the rotary motion of screw nut 5 and turn over screw 4 into the rectilinear motion of screw nut 5 through restricting screw nut 5 rotation, can also make screw nut 5 more stable in the in-process of following tilting screw 4 back and forth movement, does not take place to deflect, is favorable to improving the stability and the control accuracy of this screw mechanism of turning over control.

As shown in fig. 6 and 7, the mounting plate 22 is in an ear shape with large upper part and small lower part, and the front side surface of the connecting plate 31 is arranged in a manner of being inclined to be higher in front and lower in back; at least two mounting holes 37 are formed in the left side and the right side of the lower side of the screw rod mounting seat 3, and the mounting holes 37 are symmetrically arranged in a left-right mode. The mounting plate 22 with the big upper part and the small lower part and the connecting plate 31 which are obliquely arranged are matched, so that the propeller mounting seat 2 and the screw rod mounting seat 3 can be prevented from being in direct contact, and the mutual influence of the two is avoided; meanwhile, a larger tilting angle can be provided for the propeller mounting seat 2, so that the tilting angle of the propeller mounting seat can be larger than 90 degrees, and the propeller tilting mechanism has better adaptability; the plurality of mounting holes 37 symmetrically arranged can firmly fixedly connect the screw rod mounting seat 3 with the aircraft, so that the situation that the screw rod mounting seat 3 is not firmly connected and the whole tilting mechanism of the screw propeller is offset is avoided, and the stability and the control precision of the tilting mechanism of the screw propeller are improved.

As shown in fig. 2 and 3, the front end and the rear end of the connecting rod 6 are respectively provided with a front hinge portion 61 and a rear hinge portion 62, the rear side surface of the propeller mounting seat 2 is provided with an upper hinge portion 21, the front hinge portion 61 and the upper hinge portion 21 are hinged through a second hinge shaft 63 which is transversely arranged, the upper end of the screw nut 5 is provided with a lower hinge portion 52, the rear hinge portion 62 and the lower hinge portion 52 are hinged through a third hinge shaft 64 which is transversely arranged, and the central axes of the front hinge portion 61, the rear hinge portion 62, the lower hinge portion 52, the upper hinge portion 21, the tilting screw 4 and the screw mounting seat 3 are all located in the same vertical plane. The central axes of the front hinge part 61, the rear hinge part 62, the lower hinge part 52, the upper hinge part 21, the tilting screw 4 and the screw mounting seat 3 are all positioned in the same vertical plane, namely, the tilting mechanism of the screw is arranged symmetrically left and right relative to the vertical plane, and the design can avoid deformation of parts caused by unilateral stress during working, so that the tilting mechanism of the screw still has better stability and precision after long-time working; further, one of the front hinge portion 61 and the upper hinge portion 21 includes two positioning plates disposed in parallel, the other one of the front hinge portion 61 and the upper hinge portion 21 can be inserted between the two positioning plates and hinged through the second hinge shaft 63, one of the rear hinge portion 62 and the lower hinge portion 52 includes two positioning plates disposed in parallel, the other one of the rear hinge portion 62 and the lower hinge portion 52 can be inserted between the two positioning plates and hinged through the third hinge shaft 64, and the connection structure of the front hinge portion 61 and the upper hinge portion 21 and the connection structure of the rear hinge portion 62 and the lower hinge portion 52 can enable the connection portion to be bilaterally symmetrical, so that the situation that single-side stress does not exist in the transmission process is ensured, and stability and control accuracy of the control of the propeller tilting mechanism are improved.

As shown in fig. 1-4, the left side and the right side of the rear side of the propeller installation seat 2 are fixedly connected with an installation plate 22, a first hinge shaft 32 transversely penetrates through the installation plate 22 and is fixedly connected with the installation plate 22, a sleeve 35 capable of rotating relative to the first hinge shaft 32 is sleeved on the first hinge shaft 32, two connection plates 31 are respectively arranged, and the upper ends of the two connection plates 31 are fixedly connected with the sleeve 35; two bearings 351 are sleeved on the first hinge shaft 32, step surfaces 352 for installing the bearings 351 are arranged at two ends of the sleeve 35, a limiting ring 36 is arranged between each bearing 351 and the corresponding mounting plate 22, and two end surfaces of the limiting ring 36 are respectively abutted against the bearings 351 and the mounting plates 22. The connecting plate 31 in the propeller tilting mechanism is connected with the first hinge shaft 32 through the sleeve 35, and compared with the connecting plate 31, the connecting plate 31 is directly connected with the first hinge shaft 32, so that the contact area with the first hinge shaft 32 is increased, the rotation of the connecting plate 31 and the first hinge shaft 32 after being connected is more stable, the connecting part is not easy to deform even after long-time use, and the stability and the precision of the propeller tilting mechanism are improved; further, after the mounting plate 22 is added, the connection between the propeller mounting seat 2 and the first hinge shaft 32 can be facilitated, the structural strength of the propeller mounting seat 2 can be enhanced, and the service life of the propeller mounting seat 2 can be prolonged; the design of the bearing 351 can enable the sleeve 35 to rotate more smoothly relative to the first hinge shaft 32, the position of the bearing 351 can be limited by the design of the limiting ring 36, the bearing 351 can be more stably arranged on the step surface 352 of the sleeve 35, the position of the sleeve 35 can be limited, the sleeve 35 is prevented from moving leftwards and rightwards along the axial direction of the first hinge shaft 32, the connection stability of the sleeve 35 and the first hinge shaft 32 is improved, and the control precision of the propeller tilting mechanism is improved.

As another scheme, as shown in fig. 5, the left and right sides of the rear side of the propeller installation seat 2 are fixedly connected with installation plates 22, two connection plates 31 are fixedly connected with first hinge shafts 32 at the upper ends of the two connection plates 31, the two first hinge shafts 32 are coaxially arranged, a through hole 221 for the first hinge shafts 32 to pass through is formed in the installation plates 22, the first hinge shafts 32 are connected with the installation plates 22 through bearings 351 fixed in the through hole 221, and an installation nut 23 for transversely fixing the first hinge shafts 32 is arranged at the outer end part of the first hinge shafts 32. This design enables a relatively stable connection and relative rotation of the propeller mount 2 and the connection plate 31.

As shown in fig. 3 and 8, the rear end of the screw mounting base 3 is provided with a coupling 7, and the driving member 33 is connected to the tilting screw 4 through the coupling 7. As another alternative, as shown in fig. 9 and 10, a reduction gear set 8 is fixed to the rear end of the screw mounting base 3, and a driving member 33 is connected to the tilting screw 4 through the reduction gear set 8. This screw mechanism of turning over makes the drive piece 33 and the drive ratio increase of screw 4 that verts through setting up reduction gear set 8, and not only be convenient for carry out more accurate control to the rotation angle of screw mount pad 2, can also increase the moment of torsion, make the screw 4 of turning over can drive screw nut 5 more easily and remove to improve the stability of this screw mechanism of turning over.

The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention in this way, therefore: all equivalent changes in structure, shape and principle of the invention should be covered by the protection scope defined by the claims.

Claims

1. The utility model provides a fixed wing aircraft's screw mechanism of turning over, includes screw subassembly (1), screw subassembly (1) are fixed in on screw mount pad (2), its characterized in that: the device comprises a tilting screw (4), wherein the tilting screw (4) is longitudinally and rotatably arranged on a screw mounting seat (3), the front end of the screw mounting seat (3) is fixedly connected with a connecting plate (31), the upper end of the connecting plate (31) is hinged and fixed with the upper end of a screw mounting seat (2) through a first hinge shaft (32) which is transversely arranged, a driving piece (33) for driving the tilting screw (4) to rotate is arranged at the rear end of the screw mounting seat (3), a screw nut (5) which is meshed with the tilting screw (4) and can move forwards and backwards along with the rotation of the tilting screw (4) is arranged on the tilting screw (4), and the screw nut (5) drives the screw mounting seat (2) to rotate around the first hinge shaft (32) through a connecting rod (6) hinged with the screw nut; the connecting rod (6) is positioned between the first hinge shaft (32) and the tilting screw rod (4); the front end of the connecting rod (6) is hinged with the propeller mounting seat (2), the tilting screw rod (4) and the hinged position of the connecting rod (6) and the propeller mounting seat (2) are both located below the first hinge shaft (32), and the front side surface of the connecting plate (31) is arranged in a front-high and rear-low inclined mode.

2. A fixed wing aircraft propeller tilting mechanism according to claim 1, wherein: the screw mounting seat (3) is provided with a guide groove (34) parallel to the tilting screw (4), the screw nut (5) is fixedly connected with a guide pin (51) protruding out of the outer side wall of the screw nut (5), and the outer end part of the guide pin (51) is positioned in the guide groove (34) and can move back and forth along the guide groove (34).

3. A fixed wing aircraft propeller tilting mechanism according to claim 1, wherein: front end and rear end of connecting rod (6) are equipped with preceding articulated portion (61) and back articulated portion (62) respectively, be equipped with on the trailing flank of screw mount pad (2) and go up articulated portion (21), preceding articulated portion (61) and last articulated portion (21) are articulated fixedly through second articulated shaft (63) of horizontal setting, the upper end of lead screw nut (5) is equipped with lower articulated portion (52), back articulated portion (62) and lower articulated portion (52) are articulated fixedly through third articulated shaft (64) of horizontal setting, preceding articulated portion (61), back articulated portion (62), lower articulated portion (52), go up articulated portion (21), tilting lead screw (4) and the axis of lead screw mount pad (3) all are located same vertical plane.

4. A fixed wing aircraft propeller tilting mechanism according to claim 1, wherein: the rear end of the screw rod mounting seat (3) is provided with a coupler (7), and the driving piece (33) is connected with the tilting screw rod (4) through the coupler (7).

5. A fixed wing aircraft propeller tilting mechanism according to claim 1, wherein: the rear end of the screw rod mounting seat (3) is fixedly provided with a reduction gear set (8), and the driving piece (33) is connected with the tilting screw rod (4) through the reduction gear set (8).

6. A fixed wing aircraft propeller tilting mechanism according to claim 1, wherein: the mounting plate (22) is ear-shaped with big top and small bottom.

7. A fixed wing aircraft propeller tilting mechanism according to claim 1, wherein: the propeller assembly (1) comprises a propeller (11) and a driving motor (12), wherein the propeller (11) is fixedly connected with a driving shaft of the driving motor (12), and the driving motor (12) is fixed at the front end of the propeller mounting seat (2).

8. A fixed wing aircraft propeller tilting mechanism according to claim 1, wherein: at least two mounting holes (37) are formed in the left side and the right side of the lower side of the screw rod mounting seat (3), and the mounting holes (37) are symmetrically arranged in a left-right mode.

9. A rotor tilting mechanism for a fixed wing aircraft according to any of claims 1 to 8, wherein: the left side and the right side of screw mount pad (2) trailing flank all fixedly connected with mounting panel (22), first articulated shaft (32) transversely run through mounting panel (22) and with mounting panel (22) fixed connection, cover is equipped with sleeve (35) that can rotate relative first articulated shaft (32) on first articulated shaft (32), connecting plate (31) have two respectively and the upper end of two connecting plates (31) all with sleeve (35) fixed connection.

10. A fixed wing aircraft propeller tilting mechanism according to claim 9, wherein: the first hinge shaft (32) is sleeved with two bearings (351), step surfaces (352) for installing the bearings (351) are arranged at two ends of the sleeve (35), limiting rings (36) are arranged between each bearing (351) and the corresponding mounting plate (22), and two end surfaces of each limiting ring (36) are respectively abutted to the bearings (351) and the corresponding mounting plate (22).

11. A rotor tilting mechanism for a fixed wing aircraft according to any of claims 1 to 8, wherein: the utility model discloses a screw, including screw mount pad (2), the left and right sides of screw mount pad (2) trailing flank all fixedly connected with mounting panel (22), connecting plate (31) have two and the upper end of two connecting plates (31) has linked firmly first articulated shaft (32), and two first articulated shaft (32) are coaxial to be set up, be equipped with on mounting panel (22) and supply through-hole (221) that first articulated shaft (32) passed, first articulated shaft (32) and mounting panel (22) link to each other through bearing (351) that are fixed in through-hole (221), the outer tip of first articulated shaft (32) is equipped with transversely fixed installation nut (23) with first articulated shaft (32).