CN114476034A

CN114476034A - Buffering pillar, undercarriage and unmanned aerial vehicle

Info

Publication number: CN114476034A
Application number: CN202210089626.9A
Authority: CN
Inventors: 司亮; 余敏; 张文军; 王家星; 李金灵; 王君凤
Original assignee: Aerospace Times Feihong Technology Co ltd
Current assignee: Aerospace Times Feihong Technology Co ltd
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-05-13

Abstract

The invention relates to a buffer strut, an undercarriage and an unmanned aerial vehicle, wherein the buffer strut comprises an inner cylinder, an outer cylinder, a piston rod, a fixed damping unit and a floating damping unit, the inner cylinder is arranged in the outer cylinder, the fixed damping unit and the floating damping unit are arranged in the inner cylinder, the piston rod is arranged in the outer cylinder, one end of the piston rod is abutted against the fixed damping unit, and the other end of the piston rod is connected with a wheel fork wheel assembly. This structure is fit for unmanned aerial vehicle's buffering pillar design, can improve buffering efficiency simultaneously, reduces the landing bounce-back, reduces the manufacturing degree of difficulty and cost.

Description

Buffering pillar, undercarriage and unmanned aerial vehicle

Technical Field

The invention relates to the field of unmanned aerial vehicles, in particular to a buffer strut, an undercarriage and an unmanned aerial vehicle.

Background

In the unmanned plane wheel type take-off and landing technology, a landing gear is an important component of an airplane structure. Mainly support the shut down load of unmanned aerial vehicle, the dynamic load when the landing is landed in the roll-off and the landing. The landing gear buffer strut mainly plays a supporting role and simultaneously reduces the vibration and landing overload of the airplane.

At present, most of unmanned aerial vehicle undercarriages adopt an oil-gas buffering structure, wherein the oil needle buffering structure and the oil-air buffering structure are common in an undercarriage buffering support column. However, the manufacturing process of the oil needles is complex, the assembly precision is required to be high, no better detection method exists after assembly, eccentricity and even clamping stagnation are easy to occur, and the slow performance is greatly reduced; and the buffer structure with the fixed oil hole type finds that the reverse stroke damping is not well matched, the buffering efficiency is low, and the rebound is serious when the design is unreasonable in the working process.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides a buffer strut, an undercarriage and an unmanned aerial vehicle, which are used for solving the problems in the prior art.

The above technical object of the present invention will be achieved by the following technical solutions.

A buffer strut for an unmanned aerial vehicle comprises an inner cylinder, an outer cylinder, a reciprocating motion unit, a fixed damping unit and a floating damping unit,

the inner cylinder is arranged in the outer cylinder, the fixed damping unit and the floating damping unit are arranged in the inner cylinder, the reciprocating motion unit is arranged in the outer cylinder, one end of the reciprocating motion unit is abutted to the fixed damping unit, and the other end of the reciprocating motion unit is connected with the wheel fork assembly.

The above aspect and any possible implementation manner further provide an implementation manner, wherein the fixed damping unit is a fixed damping block or a fixed damping plate; the floating damping unit is a floating damping block or a floating damping plate.

The above aspect and any possible implementation manner further provide an implementation manner, wherein the outer barrel and the inner barrel are in interference connection through a pin arranged at the top of the inner barrel.

In the aspect and any possible implementation manner described above, a plurality of seal grooves are formed in the upper portion of the inner cylinder, and a plurality of seal rings are disposed in the seal grooves.

The above aspect and any possible implementation manner further provide an implementation manner, and a plurality of oil passing holes are formed in the inner cylinder.

The above aspect and any possible implementation manner further provide an implementation manner, a central damping hole is disposed at a central position of the floating damping unit, and side damping holes are disposed around the central damping hole.

The above aspect and any possible implementation manner further provide an implementation manner, wherein the floating damping unit is disposed at a lower portion of the inner cylinder and is in interference fit with the inner cylinder, and the fixed damping unit is disposed between the floating damping unit and the reciprocating unit.

The invention also provides an undercarriage which comprises the buffer support column, an anti-torsion arm assembly, a turning actuating device, a wheel fork assembly, a wheel and tire assembly, wherein the wheel and tire assembly is arranged on the wheel fork assembly; wherein prevent that it actuates to turn arm subassembly, turn and set up in on the buffering pillar, prevent that it actuates to turn arm subassembly connects turn actuates device and wheel fork subassembly, the wheel fork subassembly is connected wheel and tire subassembly.

In accordance with the above aspect and any one of the possible implementations, there is further provided an implementation in which the upper end of the buffering strut is connected to the drone, and the lower end of the buffering strut is connected to the fork assembly.

The invention also provides an unmanned aerial vehicle which comprises the undercarriage disclosed by the invention.

The invention has the beneficial technical effects

The buffering support column provided by the embodiment of the invention is used for an unmanned aerial vehicle, and comprises an inner cylinder, an outer cylinder, a reciprocating unit, a fixed damping unit and a floating damping unit, wherein the inner cylinder is arranged in the outer cylinder, the fixed damping unit and the floating damping unit are arranged in the inner cylinder, the reciprocating unit is arranged in the outer cylinder, one end of the reciprocating unit is abutted against the fixed damping unit, and the other end of the reciprocating unit is connected with a wheel fork assembly.

Drawings

Embodiments of the invention are described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a three-dimensional schematic view of a landing gear in an embodiment of the invention;

FIG. 2 is a schematic cross-sectional view of a cushion post according to an embodiment of the present invention;

FIG. 3 is a schematic view of damping holes in a return stroke stage of a strut in accordance with an embodiment of the present invention;

FIG. 4 is a schematic view of the damping holes of the damping strut during the return stroke phase of the damping strut in accordance with an embodiment of the present invention;

FIG. 5 is a schematic view of the installation of the fixed damping block and the floating damping block in the inner cylinder according to the embodiment of the present invention;

FIG. 6 is a schematic diagram of a floating damper structure according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description is made with reference to the accompanying drawings and specific examples, but the embodiments of the present invention are not limited thereto.

As shown in fig. 2, the buffering support column of the present invention is used for an unmanned aerial vehicle, and comprises an inner cylinder 6, an outer cylinder 5, a reciprocating unit, a fixed damping unit and a sliding damping unit,

the inner cylinder 6 is arranged in the outer cylinder 5, the fixed damping unit and the sliding damping unit are arranged in the inner cylinder 6, the reciprocating motion unit is realized by a piston rod 8, the piston rod 8 is arranged in the outer cylinder 5, one end of the piston rod is abutted to the fixed damping unit, and the other end of the piston rod is connected with the wheel fork machine wheel assembly.

Preferably, in the embodiment of the present invention, the constant damping unit is a constant damping block 10 or a constant damping plate; the sliding damping unit is a floating damping block 11 or a floating damping plate.

Preferably, in the embodiment of the invention, the outer cylinder 5 and the inner cylinder 6 of the buffer strut are connected in an interference fit manner through a pin 7, the upper part of the inner cylinder 6 is provided with a sealing groove separately, a sealing ring 12 is arranged in the sealing groove and plays a role of sealing oil gas, one end of a piston rod 8 is inserted between the outer cylinder 5 and the inner cylinder 6, the other end of the piston rod is connected with a wheel fork assembly, and the piston rod 8 plays a role of compression and shock absorption; the piston rod 8 is fixed in the outer cylinder 5 through a lower sealing ring 9, the lower sealing ring 9 is specifically arranged between the inner cylinder and the outer cylinder to play a role in sealing and guiding the piston rod 8, and a sealing ring 12 is arranged on the outer side of the lower sealing ring 9 to realize static sealing of the lower half part of the undercarriage; the inner side of the lower sealing ring 9 is provided with a sealing ring 12 to realize the dynamic sealing at the position of the piston rod 8, and each sealing ring 12 is provided with two.

Preferably, as shown in fig. 5, in the embodiment of the present invention, a floating damping block 11 is disposed at a lower portion of the inner cylinder 6 and is in interference fit with the inner cylinder 6, the fixed damping block 10 is disposed between the floating damping block 11 and the piston rod 8, a plurality of oil passing holes are disposed on a side wall of the inner cylinder 6, and the fixed damping block 10 is in threaded connection with a bottom portion of the inner cylinder 6. The floating damping block 11 can only move in a small range in the radial direction of the inner cylinder 6 due to the limitation of the fixed damping block 10. The floating damping block 11 and the fixed damping block 10 play a role of buffering together.

Preferably, as shown in fig. 6, in the embodiment of the present invention, a central damping hole is formed in the center of the floating damping block 11, side damping holes are formed around the central damping hole, and the diameters of the central damping hole and the side damping holes are adjusted according to the weight of the unmanned aerial vehicle; the central damping hole and the side damping holes play a damping role together with the fixed damping block 10 in the compression stage of the piston rod; in the rebound stage of the piston rod 8, only the central damping hole and the fixed damping block 10 are in effect, and the side damping holes are not in effect.

When the buffer strut is compressed, hydraulic oil in the inner cavity of the piston rod 8 is squeezed into an air cavity in the outer cylinder 5 through the fixed damping block 10 and then through a central damping hole and side damping holes in the floating damping block 11 as shown in fig. 3;

in the rebound stage after landing of the landing gear, the hydraulic oil is pressed into an oil cavity at the lower part of the piston rod 8 through the central damping hole in the floating damping block 11 by the high-pressure nitrogen in the outer cylinder 5, at the moment, the side damping hole of the floating damping block 11 is closed to play a reverse stopping role, and the problems of large rebound force and too fast rebound are solved, as shown in fig. 3 and 4.

Preferably, as shown in figure 1, the present invention also provides a landing gear comprising a buffer strut, an anti-twist arm assembly 2, a turn actuation device 1, a fork assembly 3 and a wheel assembly 4 of the present invention; wherein prevent turning round arm subassembly 2, turn and actuate device 1 and wheel fork subassembly 3 set up in on the buffering pillar, prevent turning round arm subassembly 2 and connecting turn and actuate device 1 and wheel fork subassembly 3, wheel fork subassembly 3 is connected wheel subassembly 4, the upper end of buffering pillar is connected with unmanned aerial vehicle's fuselage subassembly, and the other end is connected with wheel fork machine subassembly 3, and this structure is fit for small-size unmanned aerial vehicle's buffering pillar design, can improve the efficiency of buffering simultaneously, reduces the landing bounce-back, reduces the manufacturing degree of difficulty and cost.

While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the invention as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A buffer strut is characterized by comprising an inner cylinder, an outer cylinder, a reciprocating motion unit, a fixed damping unit and a floating damping unit,

the inner cylinder is arranged in the outer cylinder, the fixed damping unit and the floating damping unit are arranged in the inner cylinder, the reciprocating motion unit is arranged in the outer cylinder, one end of the reciprocating motion unit is abutted to the fixed damping unit, and the other end of the reciprocating motion unit is connected with the wheel assembly of the wheel fork.

2. The cushion strut of claim 1, wherein the fixed damping unit is a fixed damping block or a fixed damping plate; the floating damping unit is a floating damping block or a floating damping plate.

3. The cushion strut of claim 1, wherein the outer barrel and the inner barrel are interference coupled by a pin disposed at an inner top of the outer barrel.

4. The cushion strut of claim 1, wherein a plurality of sealing grooves are formed in an upper portion of the inner cylinder, and a plurality of sealing rings are disposed in the sealing grooves.

5. The strut as claimed in claim 1, wherein a plurality of oil passing holes are provided on a side wall of the inner cylinder.

6. The cushion strut of claim 1, wherein a central damping hole is formed at a central position of the floating damping unit, and a plurality of side damping holes are formed around the central damping hole.

7. The buffer strut as claimed in claim 1, wherein the floating damping unit is provided at a lower portion of the inner tube to be interference-fitted with the inner tube, and the fixed damping unit is provided between the floating damping unit and the reciprocating unit.

8. A landing gear, comprising a strut according to any one of claims 1 to 7, further comprising an anti-twist arm assembly, a turn actuation device, a fork assembly and a wheel and tyre assembly; wherein prevent that it actuates to turn arm subassembly, turn and set up in on the buffering pillar, prevent that it actuates to turn arm subassembly connects turn actuates device and wheel fork subassembly, the wheel fork subassembly is connected wheel and tire subassembly.

9. A landing gear according to claim 8, wherein the upper end of the strut is connected to the drone and the lower end of the strut is connected to the fork assembly.

10. A drone, characterised in that it comprises a landing gear according to any one of claims 8 to 9.