CN212332957U

CN212332957U - High-attitude skid undercarriage

Info

Publication number: CN212332957U
Application number: CN202020321813.1U
Authority: CN
Inventors: 张晓冬; 赵凯; 王荣; 文鹤运; 刘阳
Original assignee: Shaanxi China Aero-Industry Gas Spring Co Ltd
Current assignee: Shaanxi China Aero-Industry Gas Spring Co Ltd
Priority date: 2020-03-16
Filing date: 2020-03-16
Publication date: 2021-01-12
Anticipated expiration: 2030-03-16

Abstract

The utility model discloses a high appearance skid undercarriage in aircraft field, including the preceding horizontal pipe, the back is violently managed, left slide tube, right slide tube, the abrasionproof piece, the spring board, the connecting piece, ground drags aircraft wheel installation interface, step and maintenance footboard, the preceding horizontal pipe is designed for "bow" with the back is violently managed to the back, adopt the elastoplasticity steel pipe, left side slide tube and right slide tube pass through connecting piece and bolt fastening in the preceding both sides of violently managing and the back is violently managed, all be equipped with ground drags aircraft wheel installation interface on left side slide tube and the right slide tube, the front end of left side slide tube and right slide tube perk 28 to the upper front, spring board is all installed to the rear end of left side slide tube and right slide tube, the abrasionproof piece is installed to the bottom of left side slide tube and right slide tube, connect the step of boarding between the front end of left side slide tube and right slide tube perk and the preceding horizontal pipe, the both sides of violently managing and the back violently managing are located and, The structure is light in weight, good in maintainability, high in reliability, high in attendance rate, low in manufacturing cost, low in landing site requirement and the like.

Description

High-attitude skid undercarriage

Technical Field

The utility model relates to an aircraft technical field specifically is high appearance skid undercarriage.

Background

The skid landing gear is an aircraft landing device with simple structure and light weight, and is mainly used in places unsuitable for adopting wheel landing gears, such as snowfields, sand beaches and the like, or used in the situation that the flat flying speed is low and the wheel landing gears are not needed. Skid landing gear is used more often on light helicopters, such AS the american "cobra" helicopter, french AS350 "squirrel" helicopter, the chinese "straight 11" helicopter, "AC 311A" helicopter, etc. At present, skid landing gears matched with the AC311A helicopters in China are imported products, have long purchasing period and are often limited by foreign supply, so that the skid landing gears are very necessary to be replaced in a domestic manner.

Based on this, the utility model designs a high appearance skid undercarriage to solve the above-mentioned problem of mentioning.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high appearance skid undercarriage to solve the problem of proposing among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a high-attitude skid landing gear comprises a front transverse pipe, a rear transverse pipe, a left sliding pipe, a right sliding pipe, an anti-abrasion sheet, a spring plate, a connecting piece, a ground tractor wheel mounting interface, an boarding pedal and a maintenance pedal, the front transverse pipe and the rear transverse pipe are designed to be bow-shaped, elastic plastic steel pipes are adopted, the left sliding pipe and the right sliding pipe are fixedly connected to the two sides of the front transverse pipe and the rear transverse pipe through connecting pieces and bolts, the left sliding pipe and the right sliding pipe are respectively provided with a ground tractor wheel mounting interface, the front ends of the left sliding pipe and the right sliding pipe are tilted by 28 degrees towards the front upper part, the rear ends of the left sliding pipe and the right sliding pipe are respectively provided with a spring plate, the bottoms of the left sliding pipe and the right sliding pipe are provided with anti-wear sheets, boarding pedals are respectively connected between the tilted front ends of the left sliding pipe and the right sliding pipe and the front transverse pipe, and the two sides of the front transverse pipe and the rear transverse pipe are positioned above the left sliding pipe and the right sliding pipe and are connected with a maintenance pedal.

Preferably, the front transverse pipe and the rear transverse pipe are designed to be of variable cross sections, the inner diameters of the transverse pipes are unchanged, the outer diameters of the transverse pipes are different in size in different areas, the inner diameter and the outer diameter of the middle straight pipe area are unchanged, and the outer diameter of the bent pipe area is smaller as the bent pipe area is closer to the lower end.

Preferably, the span of the front transverse tube and the rear transverse tube is 2100mm, the height of the front transverse tube is 631.5mm, the height of the rear transverse tube is 837.5mm, the front transverse tube is formed by bending a 35CrMoA seamless steel tube with the specification of G59.5 multiplied by 4.35, and the rear transverse tube is formed by bending a 35CrMoA seamless steel tube with the specification of G58.5 multiplied by 3.85.

Preferably, the two ends of the front transverse tube are respectively designed into a variable cross section with the length of 905.5mm and the taper of 1: 226.375; the two ends of the rear transverse tube are respectively provided with a variable cross section design with the length of 1064mm and the taper of 1: 354.667.

Preferably, the straight pipe region in the middle of the front transverse pipe and the rear transverse pipe is a machine body installation region, the two ends of the straight pipe region located in the machine body installation region are provided with limiting clamps, and the bent pipe regions at the two ends of the front transverse pipe are provided with skid damper installation interfaces.

Preferably, the left sliding pipe and the right sliding pipe are both made of 6061-T6 aluminum pipes and are internally provided with I-beam aluminum profiles.

Preferably, the anti-abrasion sheet is made of stainless steel.

Preferably, four of the ground tractor wheel mounting interfaces are provided.

Preferably, the connecting piece material adopts 6061-T6, every group the connecting piece includes two connection fasteners, connect the fastener including connecting segmental arc, connection plane section and protruding reinforcing part, protruding reinforcing part is located one side of connection plane section, all open the bolt hole on connection segmental arc, connection plane section and the protruding reinforcing part.

Preferably, the spring plate adopts 35CrMo steel sheet that thickness is 9.5mm to make, is 3.9 jiaos of settings, the one end that the slide tube was kept away from to the spring plate is the perk structure, and the perk angle is 15.

Compared with the prior art, the beneficial effects of the utility model are that:

1) the utility model has the advantages of few parts, light structure weight, good maintainability, high reliability, high attendance rate, lower manufacturing cost, low requirement on landing sites, and the like.

2) The front transverse pipe and the rear transverse pipe are designed to be bow-shaped, steel pipes with good elastic-plastic performance are adopted, the landing energy of the helicopter is absorbed through elastic-plastic deformation of the front transverse pipe and the rear transverse pipe in the landing process of the helicopter, landing overload is reduced, quick damage to a body structure in daily use is avoided, and the safety landing reliability of the helicopter is improved.

3) The front horizontal tube and the rear horizontal tube are designed to be variable in cross section, so that the weight of the landing gear of the high-attitude skid is reduced and the effective load of the helicopter is increased on the premise of meeting the requirements on landing performance, static rigidity and strength.

4) The left sliding pipe and the right sliding pipe are in a structural form of aluminum profiles with built-in I-beam aluminum profiles, the vertical rigidity of the sliding pipes is improved while the weight of the sliding pipes is controlled, and the bearing capacity is improved.

5) The left sliding pipe and the right sliding pipe are frequently rubbed with the ground in the using process and are easy to wear, and in order to prolong the service life of the sliding pipes, metal wear-resistant sheets which are good in wear resistance and easy to replace are arranged at the bottoms of the sliding pipes.

6) The front transverse pipe, the rear transverse pipe and the sliding pipe are connected in a mode of connecting fasteners and bolts, so that interchangeability of products is improved, the front transverse pipe, the rear transverse pipe and the sliding pipe are connected together in a mode of buckling 8 same connecting fasteners in pairs, the connecting pieces are fixed through bolts, and the connecting pieces can be interchanged. The assembly difficulty is reduced, the assembly and maintenance time is shortened, and the guarantee and maintenance of the product are improved.

7) The tail parts of the left sliding pipe and the right sliding pipe are respectively provided with a spring plate extending backwards so as to adjust the vertical rigidity of the undercarriage, change the natural frequency of the undercarriage, prevent ground resonance from occurring, and eliminate or reduce the possibility of serious damage of the helicopter caused by the coupling resonance of the helicopter and the ground.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the front horizontal tube structure of the present invention;

fig. 3 is a schematic structural view of the rear horizontal tube of the present invention;

FIG. 4 is a schematic view of the slide pipe structure of the present invention;

FIG. 5 is a schematic view of the connecting fastener of the present invention;

fig. 6 is a schematic diagram of the spring plate structure of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a front horizontal tube; 2. a rear horizontal tube; 3. a left slide tube; 4. a right slide tube; 5. an anti-wear sheet; 6. a spring plate; 7. a connecting member; 8. a ground tractor wheel mounting interface; 9. an boarding pedal; 10. a maintenance pedal; 11. a fuselage mounting area; 12. a limiting clamp; 13. a ski damper mounting interface; 14. connecting fasteners; 15. Connecting the arc sections; 16. connecting the planar sections; 17. a raised reinforcing portion; 18. bolt holes.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: a high-attitude skid undercarriage comprises a front transverse pipe 1, a rear transverse pipe 2, a left sliding pipe 3, a right sliding pipe 4, an anti-abrasion piece 5, a spring plate 6, a connecting piece 7, a ground tractor wheel mounting interface 8, a boarding pedal 9 and a maintenance pedal 10, wherein the front transverse pipe 1 and the rear transverse pipe 2 are core components required by the landing performance of the high-attitude skid undercarriage, the front transverse pipe 1 and the rear transverse pipe 2 are designed to be bow-shaped, and are made of elastoplastic steel pipes, the elastoplastic performance is good, and the landing energy of a helicopter is absorbed through the elastoplastic deformation of the front transverse pipe 2 and the rear transverse pipe 2 in the landing process of the helicopter, so that the landing overload is reduced. The left slide pipe 3 and the right slide pipe 4 mainly function to support and transmit ground load. Left side slide tube 3 and right slide tube 4 pass through connecting piece 7 and bolt fixed connection in the preceding both sides of violently managing 1 and rear horizontal tube 2, all be equipped with ground on left side slide tube 3 and the right slide tube 4 and drag aircraft wheel installation interface 8, the front end of left side slide tube 3 and right slide tube 4 upwards tilts forward 28, for the trafficability when guaranteeing helicopter landing and ground and slide, spring plate 6 is all installed to the rear end of left side slide tube 3 and right slide tube 4, and the vertical rigidity of undercarriage is adjusted to spring plate 6. The utility model discloses an elasticity, the plastic deformation of violently managing 1 and the back of preceding pipe 2 come the absorbed energy, for satisfying the design requirement that the whole machine prevented to take place ground resonance, respectively installed a spring plate 6 that stretches out backward at the afterbody of left slide pipe 3 and right slide pipe 4 during the design to the vertical rigidity of adjustment undercarriage, change the natural frequency of undercarriage, prevent that ground resonance from taking place. The anti-abrasion piece 5 is installed at the bottom of the left sliding tube 3 and the right sliding tube 4, boarding pedals 9 are connected between the tilted front ends of the left sliding tube 3 and the right sliding tube 4 and the front transverse tube 1, and maintenance pedals 10 are connected between the two sides of the front transverse tube 1 and the rear transverse tube 2 and above the left sliding tube 3 and the right sliding tube 4.

Referring to fig. 2 and 3, a schematic structural diagram of a front horizontal tube 1 and a schematic structural diagram of a rear horizontal tube 2 are respectively shown, and the landing performance, static stiffness, strength and weight design are comprehensively considered, the front horizontal tube 1 and the rear horizontal tube 2 both adopt a variable cross-section design, the variable cross-section design is that the inner diameter of the horizontal tubes is unchanged, the outer diameters of the horizontal tubes are different in different areas, the inner diameter and the outer diameter of the middle straight tube area are unchanged, and the outer diameter of the bent tube area is smaller as the bent tube area is closer to the lower end.

The span of the front transverse tube 1 and the span of the rear transverse tube 2 are 2100mm, the height of the front transverse tube 1 is 631.5mm, the height of the rear transverse tube 2 is 837.5mm, the front transverse tube 1 is formed by bending a 35CrMoA seamless steel tube with the specification of G59.5 multiplied by 4.35, the rear transverse tube 2 is formed by bending a 35CrMoA seamless steel tube with the specification of G58.5 multiplied by 3.85, and the helicopter landing energy is absorbed through the elastic-plastic deformation of the front transverse tube 2 and the rear transverse tube 2 in the helicopter landing process, so that the landing overload is reduced.

The two ends of the front transverse pipe 1 are respectively designed with variable sections with the length of 905.5mm and the taper of 1:226.375 (the angle is 0.253 degrees); the two ends of the rear transverse tube 2 are respectively provided with a variable cross section design with the length of 1064mm and the taper of 1:354.667 (the angle is 0.162 degrees).

The straight tube region in the middle of the front transverse tube 1 and the rear transverse tube 2 is a machine body installation region 11, the two ends of the machine body installation region 11 are provided with limiting clamps 12, limiting blocks fixedly installed on the transverse tubes are used for preventing the skids from moving laterally with the fixed position of the machine body, and bent tube regions at the two ends of the front transverse tube 1 are provided with skid damper installation interfaces 13.

Referring to fig. 4, which are schematic diagrams of slide pipe structures, the left slide pipe 3 and the right slide pipe 4 are made of 6061-T6 aluminum pipes and are provided with built-in i-beam aluminum profiles, and the vertical rigidity of the slide pipes and the bearing capacity can be improved while the weight of the slide pipes is controlled by the built-in i-beams.

The anti-abrasion sheet 5 is made of stainless steel, the sliding pipe is frequently rubbed with the ground in the using process and is easy to abrade, and the metal anti-abrasion sheet 5 which is good in abrasion resistance and easy to replace is installed at the bottom of the sliding pipe for prolonging the service life of the sliding pipe.

The four ground tractor wheel mounting interfaces 8 are arranged, the helicopter provided with the high-attitude skid landing gear does not have the capability of directly moving on the ground, the ground tractor wheels are required to be mounted on the high-attitude skid landing gear, and the ground tractor wheel mounting interfaces are arranged for connection through 4 ground tractor wheel mounting bolt interfaces.

Wherein, as shown in fig. 5, respectively for connecting 14 structure schematic diagrams, connecting piece 7 material adopts 6061-T6, every group connecting piece 7 includes two connection fastener 14, connect fastener 14 including connecting arc section 15, connection plane section 16 and protruding rib 17, protruding rib 17 is located one side of connection plane section 16, all open bolt hole 18 on connecting arc section 15, connection plane section 16 and the protruding rib 17, the mode that adopts connection fastener 14 bolted connection has following two advantages:

a) the interchangeability of products is improved, the front and rear transverse tubes 2 and the sliding tubes are connected together in a mode that 8 identical connecting fasteners 14 are buckled with each other pairwise, the connecting pieces 7 are fixed through bolts, and the connecting pieces 7 can be interchanged.

b) The assembly difficulty is reduced, the assembly and maintenance time is shortened, and the guarantee and maintenance of the product are improved.

Referring to fig. 5, the schematic structural diagrams of the spring plates 6 are shown respectively, and the spring plates 6 are made of 35CrMo steel plates with the thickness of 9.5mm and are arranged at an angle of 3.9 degrees to adjust the vertical rigidity of the landing gear, change the natural frequency of the landing gear and prevent ground resonance. The one end that the slide pipe was kept away from to spring board 6 is the perk structure, and the perk angle is 15, for making things convenient for spring board 6 to slide on ground along with the slide pipe.

The utility model discloses the supporting finished product of light-duty helicopter below the mainly used 3 tons, the main function is that absorb helicopter landing energy and reduce landing load and transfer ground load, support the helicopter on ground and provide the ground equipment interface that slides, possess cockpit, passenger cabin boarding footboard 9, possess ground service maintenance footboard 10, the undercarriage still need satisfy the requirement that prevents the helicopter and take place ground resonance.

The working principle is as follows: the utility model is used for absorb helicopter landing energy and reduce landing load and transmission ground load, support the helicopter on ground and provide the ground equipment interface that slides, its theory of operation as follows:

the landing energy of the aircraft is absorbed by elastic and plastic deformation of the front transverse pipe 1 and the rear transverse pipe 2, and in order to avoid ground resonance, spring plates 6 extending backwards are respectively arranged below the tail parts of the left sliding pipe 3 and the right sliding pipe 4 so as to adjust the rigidity of the landing gear of the high-attitude skid, change the natural frequency of the landing gear of the high-attitude skid and prevent the ground resonance.

The left sliding pipe 3 and the right sliding pipe 4 mainly play a supporting role, the bottom of each sliding pipe is provided with an anti-abrasion piece 5 so as to prevent the high-posture skid landing frame from being abraded when the high-posture skid landing frame slides on the ground, a certain lateral damping force can be provided, and the sliding pipes are provided with ground tractor equipment interfaces for being connected with ground tractor equipment so as to facilitate the transportation and the movement of an airplane when the airplane stops on the ground.

The boarding pedal 9 and the maintenance pedal 10 mainly play a supporting role, and provide convenience for drivers, passengers and maintenance personnel.

The utility model discloses high appearance skid rises and falls to erect timing and has comprehensively considered high appearance skid landing gear at the arrangement of organism structure, landing gear rigidity, landing performance designing requirement such as, confirms the overall arrangement and the structural parameter of high appearance skid landing gear to carry out the check calculation to the landing performance of high appearance skid landing gear through simulation analysis, according to calculation result adjustment design parameter, after the iterative computation of a lot of is relapse, finally confirm the design parameter of high appearance skid landing gear.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. High appearance skid undercarriage, its characterized in that: including preceding violently pipe, the back violently pipe, left slide tube, right slide tube, wear proof piece, spring plate, connecting piece, ground drags wheel installation interface, boarding footboard and maintenance footboard, the preceding violently pipe is violently managed with the back and is designed for "bow" shape, adopts the elastoplasticity steel pipe, left side slide tube and right slide tube pass through connecting piece and bolt fixed connection in the preceding both sides of violently managing and violently managing in the back, all be equipped with ground drags wheel installation interface on left side slide tube and the right slide tube, the front end of left side slide tube and right slide tube is preceding the top perk 28, and the spring plate is all installed to the rear end of left side slide tube and right slide tube, wear proof piece is installed to the bottom of left side slide tube and right slide tube, all be connected the boarding footboard between the front end of left side slide tube and right slide tube perk and the preceding violently pipe, the preceding both sides of violently managing and the back are located and connect the maintenance footboard between left side slide.

2. The high skid landing gear of claim 1, wherein: the front transverse pipe and the rear transverse pipe are designed to be variable in cross section, the inner diameter of the transverse pipe is unchanged, the outer diameter of the transverse pipe is different in size in different areas, the inner diameter and the outer diameter of the middle straight pipe are unchanged, and the outer diameter of the bent pipe area is smaller as the bent pipe area is closer to the lower end.

3. The high skid landing gear of claim 1, wherein: the span of the front transverse tube and the span of the rear transverse tube are 2100mm, the height of the front transverse tube is 631.5mm, the height of the rear transverse tube is 837.5mm, the front transverse tube is formed by bending a 35CrMoA seamless steel tube with the specification of G59.5 multiplied by 4.35, and the rear transverse tube is formed by bending a 35CrMoA seamless steel tube with the specification of G58.5 multiplied by 3.85.

4. The high skid landing gear of claim 2, wherein: the two ends of the front transverse pipe are respectively designed into variable sections with the length of 905.5mm and the taper of 1: 226.375; the two ends of the rear transverse tube are respectively provided with a variable cross section design with the length of 1064mm and the taper of 1: 354.667.

5. The high skid landing gear of claim 1, wherein: the straight tube region between the front transverse tube and the rear transverse tube is a machine body installation region, the two ends of the machine body installation region are provided with limiting clamps, and the bent tube regions at the two ends of the front transverse tube are provided with skid damper installation interfaces.

6. The high skid landing gear of claim 1, wherein: the left sliding pipe and the right sliding pipe are both made of 6061-T6 aluminum pipes and are internally provided with I-shaped beam aluminum profiles.

7. The high skid landing gear of claim 1, wherein: the anti-abrasion piece is made of stainless steel.

8. The high skid landing gear of claim 1, wherein: the ground tractor wheel mounting interfaces are four.

9. The high skid landing gear of claim 1, wherein: the connecting piece material adopts 6061-T6, every group the connecting piece includes two connection fasteners, connect the fastener including connecting arc section, connection plane section and protruding rib, protruding rib is located one side of connection plane section, all open the bolt hole on connection arc section, connection plane section and the protruding rib.

10. The high skid landing gear of claim 1, wherein: the spring plate is made of a 35CrMo steel plate with the thickness of 9.5mm and is arranged at an angle of 3.9 degrees, one end, far away from the sliding pipe, of the spring plate is of a tilting structure, and the tilting angle is 15 degrees.