CN111301666A

CN111301666A - Novel straight lifting retractable undercarriage

Info

Publication number: CN111301666A
Application number: CN202010173960.3A
Authority: CN
Inventors: 贺龙杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2020-06-19

Abstract

The invention relates to the technical field of space shuttles and discloses a novel straight lifting retractable undercarriage which comprises an undercarriage body, wherein a bottom plate is fixedly welded at the bottom of the undercarriage body, and a wheel outlet is formed in the bottom plate in a penetrating mode. This novel straight lift extendible undercarriage, be the straight lift formula through changing traditional shrink folding mode, undercarriage folding device's structure has been simplified, and the rotation that drives the screw rod through the rotation of motor realizes the lift operation to the wheel, utilize the hydraulic stem to promote spacing fixture block, the realization is to carrying out the position locking to the urceolus after putting down the wheel, and spacing fixture block joint is inside the fixed stay ring of welding at the supporting shoe upper surface, thereby the middle locking effect who borrows spacing fixture block comes to utilize the fixed stay ring fixed to support the wheel, thereby realize the whole of undercarriage and support, and the linkage nature between the structure is strong, the control of system has been simplified.

Description

Novel straight lifting retractable undercarriage

Technical Field

The invention relates to the technical field of space shuttles, in particular to a novel straight lifting retractable landing gear.

Background

The landing gear is an important part for supporting the airplane to move and park on the ground, and especially plays an extremely important safety role in the safe taking-off and landing process of the airplane, the existing airplane generally retracts the landing gear after the airplane takes off in order to reduce the resistance in the flight process, but the existing landing gear retracting and releasing device always has the following problems:

1. the main landing gear retraction device arranged at the root of the wing is influenced by the thickness of the wing, the main landing gear can be retracted towards the direction of a machine body or towards the inside of the wing only through a complex hydraulic transmission system, the nose landing gear in front is positioned at a machine head position, and enough space is available for retracting the landing gear in the vertical direction, but the nose landing gear is still retracted by adopting a hydraulic system, the space for storing the nose landing gear is greatly increased due to the complex hydraulic retraction system, not only the whole lower landing gear is required to be accommodated, but also the complex hydraulic retraction system is required to be accommodated, meanwhile, due to the complex hydraulic retraction system, when the landing gear is retracted, the system needs to sequence the work of a plurality of hydraulic rods, the complexity of the system work is increased, and the number of parts formed by the system is greatly increased, the probability that the spare part goes wrong has been increased, in case one of them spare part goes wrong, whole hydraulic system will receive the influence, unable normal work, and current undercarriage is owing to need shrink to extend, its part of connecting on the organism must be rotary part, can have more stable performance when supporting the organism in order to keep the undercarriage, the slant hydraulic support system of side has been increased again, further increase hydraulic system's complexity, and this kind of hydraulic support system that the side is flexible also can lead to its structural strength not enough owing to the reason that needs the rotation, can not be fine carry out stable support to the organism.

Disclosure of Invention

The invention provides a novel straight lifting retractable landing gear which has the advantages of simple structure, linkage property, small occupied space and good stability, and solves the problems in the prior art.

The invention provides the following technical scheme: a novel straight lifting retractable landing gear comprises a machine body, wherein a bottom plate is fixedly welded at the bottom of the machine body, a wheel outlet is formed in the bottom plate in a penetrating mode, a supporting block is fixedly welded on the upper surface of the bottom plate, a first accommodating cavity corresponding to the position of the wheel outlet is formed in the supporting block in a penetrating mode, an outer barrel is movably connected in the first accommodating cavity, a second accommodating cavity is formed in the outer barrel, a circular groove is formed in the bottom of the inner barrel, a fixed supporting ring located on the outer side of the outer barrel is fixedly welded on the upper surface of the supporting block, a chuck is movably connected in the circular groove and is connected with a screw rod through a thread groove thread, the outer barrel is movably connected to the outer side of an inner barrel, the thread groove is formed in the bottom of the inner barrel in a penetrating mode, first sliding grooves are formed in two sides, the utility model discloses a hydraulic shock absorber, including the screw rod, the outside activity of screw rod has cup jointed return spring, the top swing joint of screw rod has the pivot, the top fixedly connected with motor of pivot, the outside both sides of motor are fixed mounting respectively has first slider, first slider swing joint is in the inside of first spout, the both sides that the supporting shoe upper surface is located fixed support ring are fixed mounting respectively has the hydraulic stem, the hydraulic stem passes through the spacing fixture block of movable rod fixedly connected with, urceolus bottom fixed surface installs the bumper shock absorber, the bottom fixed mounting of bumper shock absorber has the wheel.

Preferably, the length of the screw thread on the screw is equal to the distance between the lower surface of the top of the outer cylinder and the upper surface of the top of the fixed support ring.

Preferably, the two sides of the inside of the top of the screw rod are provided with second sliding grooves, the second sliding grooves are movably connected with second sliding blocks, and the second sliding blocks are fixedly arranged on the two sides of the bottom end of the rotating shaft.

Preferably, the position of a vertical line at one end of the limiting fixture block, which is close to the fixed support ring when the undercarriage is retracted, does not exceed the position of a vertical line at the outer edge of the same side of the top end of the outer cylinder, and the shape of an inner groove of the limiting fixture block is the same as the shape of a tangent plane when the outer ring at the top end of the outer cylinder contacts with the upper surface of the fixed support ring.

The invention has the following beneficial effects:

the novel straight lifting retractable landing gear changes the traditional retraction folding mode into a straight lifting mode, simplifies the structure of the landing gear retracting device, the lifting operation of the airplane wheel is realized by driving the screw rod to rotate through the rotation of the motor, the position of the outer cylinder after the airplane wheel is put down is locked by pushing the limiting clamping block through the hydraulic rod, the limiting clamping block is clamped in the fixed support ring welded on the upper surface of the support block, thereby supporting the airplane wheel by fixing the fixed support ring by the middle locking function of the limit clamping block, thereby realizing the integral support of the landing gear, and the retraction and extension mode only occupies a limited linear space in the vertical direction of the airplane wheel, and no complex hydraulic system is provided, the retraction system has simple structure, small occupied space and strong linkage between structures, and the control of the system is simplified.

Drawings

FIG. 1 is a schematic illustration of the present invention with the structural landing gear retracted;

FIG. 2 is a schematic view of the structure of the present invention with the landing gear down;

FIG. 3 is a schematic view of the structural outer barrel of the present invention;

FIG. 4 is a top cross-sectional view of a screw according to the present invention;

FIG. 5 is a schematic top view of a screw according to the present invention.

In the figure: 1. a body; 2. a base plate; 3. a wheel outlet; 4. a support block; 5. a first accommodating chamber; 6. an outer cylinder; 7. a second accommodating chamber; 8. a circular groove; 9. fixing the support ring; 10. a chuck; 11. a thread groove; 12. a screw; 13. an inner barrel; 14. a first chute; 15. a return spring; 16. a second chute; 17. a rotating shaft; 18. a motor; 19. a first slider; 20. a hydraulic lever; 21. a limiting clamping block; 22. a shock absorber; 23. a machine wheel; 24. and a second slider.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, a novel straight lifting retractable landing gear comprises a machine body 1, a bottom plate 2 is fixedly welded at the bottom of the machine body 1, a wheel outlet 3 is formed in the bottom plate 2 in a penetrating manner, a supporting block 4 is fixedly welded on the upper surface of the bottom plate 2, a first accommodating cavity 5 corresponding to the wheel outlet 3 is formed in the supporting block 4 in a penetrating manner, an outer cylinder 6 is movably connected in the first accommodating cavity 5, a second accommodating cavity 7 is formed in the outer cylinder 6, a circular groove 8 is formed in the bottom of the outer cylinder 6, a fixed supporting ring 9 positioned on the outer side of the outer cylinder 6 is fixedly welded on the upper surface of the supporting block 4, a chuck 10 is movably connected in the circular groove 8, the chuck 10 is connected with a screw 12 through a thread groove 11 in a threaded manner, the outer cylinder 6 is movably connected to the outer side of an inner cylinder 13, the thread groove 11 is formed in the bottom, inner tube 13 fixed mounting is inside the fuselage, return spring 15 has been cup jointed in the outside activity of screw rod 12, the top swing joint of screw rod 12 has pivot 17, the top fixedly connected with motor 18 of

pivot

17, 18 outside both sides of motor are first slider 19 of fixed mounting respectively, 19 swing joint is in the inside of first spout 14 of first slider, 4 upper surfaces of supporting shoe are located the both sides of fixed stay ring 9 and are fixed mounting respectively has hydraulic stem 20, hydraulic stem 20 passes through the spacing fixture block 21 of movable rod fixedly connected with, 6 bottom fixed surface of urceolus installs bumper shock absorber 22, the bottom fixed mounting of bumper shock absorber 22 has wheel 23.

Wherein, the length of seting up of screw thread on the screw rod 12 equals the distance between 6 top lower surfaces of urceolus and the fixed support ring 9 top upper surface, under the rotatory drive of motor 18 like this, screw rod 12 promotes urceolus 6 downstream along 11 internal rotations in thread groove, thereby the top part of screw thread just can break away from inside 11 thread grooves when making the lower surface of urceolus 6 and the upper surface contact of fixed support ring 9 at last, make screw rod 12 break away from the connection of inner tube 13 like this, can avoid like this can not making the screw thread on the

screw rod

12 and 11 contact of thread groove take place the bearing when urceolus 6 carries out the bearing, guarantee threaded connection's integrity, thereby guarantee the normal work of whole device.

Wherein, second spout 16 has been seted up to the inside both sides in screw rod 12 top, swing joint has second slider 24 in the second spout 16, second slider 24 fixed mounting is in the both sides of pivot 17 bottom, the setup of second spout 16 is guaranteed to make second slider 24 utilize gravity to fall by oneself in second spout 16 after screw rod 12 fully rotates out thread groove 11, the part of screw thread just can utilize second spout 16 space on the vertical direction further whereabouts on screw rod 12 like this, more can guarantee like this that screw rod 12 can not be with thread groove 11 contactless when urceolus 6 bears the effort, threaded connection's integrity has further been guaranteed like this.

Wherein, the position of the vertical line of one end of the limiting fixture block 21 close to the fixed support ring 9 when the landing gear is retracted does not exceed the position of the vertical line of the outer ring edge of the same side at the top end of the outer cylinder 6, the shape of the inner groove of the limiting fixture block 21 is the same as the shape of the tangent plane when the outer ring at the top end of the outer cylinder 6 contacts with the upper surface of the fixed support ring 9, thus the outer ring at the top end of the outer cylinder 6 can be smoothly lowered to the upper surface of the fixed support ring 9 and mutually jointed in the landing gear lowering process, then the hydraulic rod 20 is started under the control of the system to push the limiting fixture block 21 to be clamped to the contacted positions of the outer cylinder 6 and the fixed support ring 9, so that the top end of the outer cylinder 6 is fixed by the limiting fixture block 21, and the limiting fixture block 21 is clamped into the space at the, thereby ensuring proper function of the landing gear.

The working principle is that when an airplane is about to land, a system starts a motor 18, the motor 18 drives a rotating shaft 17 to rotate, the rotating shaft 17 drives a screw 12 to rotate through the limit of a second sliding block 24 in a second sliding groove 16, threads on the screw 12 rotate in a thread groove 11, so that the screw 12 moves downwards, meanwhile, a first sliding block 19 gradually compresses a return spring 15 in the downward moving process, the screw 12 moves downwards to push an outer cylinder 6 to move downwards through a chuck 10, an outer ring at the top of the outer cylinder 6 can contact the upper surface of a fixed supporting ring 9 along with the pushing, when the fixed supporting ring 9 and the outer cylinder 6 are in contact with each other, a system starting hydraulic rod 20 pushes a limit clamping block 21, so that the limit clamping block 21 moves towards the outer cylinder 6 and then is clamped and fixed on the outer cylinder 6, and the shock absorber 22 and an airplane wheel 23 are pushed to move downwards by the downward movement of the outer cylinder 6, so that, the process of retracting the landing gear after the aircraft takes off is the reverse of extending the landing gear.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a novel straight lift extendible undercarriage, includes organism (1), the bottom fixed welding of organism (1) has bottom plate (2), run through on bottom plate (2) and seted up out wheel mouth (3), its characterized in that: the upper surface of the bottom plate (2) is fixedly welded with a supporting block (4), a first accommodating cavity (5) corresponding to the position of the wheel outlet (3) is formed in the supporting block (4) in a penetrating mode, an outer barrel (6) is movably connected in the first accommodating cavity (5), a second accommodating cavity (7) is formed in the outer barrel (6), a circular groove (8) is formed in the bottom of the inner barrel (6), a fixed supporting ring (9) located on the outer side of the outer barrel (6) is fixedly welded on the upper surface of the supporting block (4), a chuck (10) is movably connected in the circular groove (8), the chuck (10) is in threaded connection with a screw rod (12) through a thread groove (11), the outer barrel (6) is movably connected in the outer side of the inner barrel (13), the thread groove (11) is formed in the bottom of the inner barrel (13) in a penetrating mode, first sliding grooves (14) are formed in two sides of the inner barrel, inner tube (13) fixed mounting is inside the fuselage, return spring (15) have been cup jointed in the outside activity of screw rod (12), the top swing joint of screw rod (12) has pivot (17), the top fixedly connected with motor (18) of pivot (17), the outside both sides of motor (18) fixed mounting respectively have first slider (19), first slider (19) swing joint is in the inside of first spout (14), the both sides that supporting shoe (4) upper surface is located fixed support ring (9) are fixed mounting respectively has hydraulic stem (20), hydraulic stem (20) are through the spacing fixture block of movable rod fixedly connected with (21), urceolus (6) bottom fixed surface installs bumper shock absorber (22), the bottom fixed mounting of bumper shock absorber (22) has wheel (23).

2. A novel straight lift retractable landing gear according to claim 1, wherein: the length of the screw thread on the screw rod (12) is equal to the distance between the lower surface of the top of the outer cylinder (6) and the upper surface of the top of the fixed support ring (9).

3. A novel straight lift retractable landing gear according to claim 1, wherein: second spout (16) have been seted up to inside both sides in screw rod (12) top, swing joint has second slider (24) in second spout (16), second slider (24) fixed mounting is in the both sides of pivot (17) bottom.

4. A novel straight lift retractable landing gear according to claim 1, wherein: the position of a vertical line at one end of the limiting fixture block (21), which is close to the fixed support ring (9), does not exceed the position of a vertical line at the outer ring side at the same side of the top end of the outer cylinder (6) when the landing gear is retracted, and the shape of an inner groove of the limiting fixture block (21) is the same as the shape of a tangent plane when the outer ring at the top end of the outer cylinder (6) is in contact with the upper surface of the fixed support ring (.