CN213139123U

CN213139123U - Landing gear cabin door

Info

Publication number: CN213139123U
Application number: CN202021131921.9U
Authority: CN
Inventors: 任远春; 王宝峰; 范庆志
Original assignee: Xian Aircraft Design and Research Institute of AVIC
Current assignee: Xian Aircraft Design and Research Institute of AVIC
Priority date: 2020-06-17
Filing date: 2020-06-17
Publication date: 2021-05-07
Anticipated expiration: 2030-06-17

Abstract

The utility model provides an undercarriage hatch door, include: a composite laminated skin (100) and a metal skin (400); the composite laminated skin (100) is disposed at a dimple of the landing gear door interior surface; the metal skin (400) is disposed on the landing gear door interior surface except for the dimples. The composite material has the advantages of good integral forming manufacturability, overcomes the defects of cracks and the like which possibly occur in the pressure forming process of the metal skin with the pressure pit, improves the production efficiency, is convenient to detect and repair, and is particularly suitable for use scenes that the airplane wheel with the limited structure height sinks into a cabin door structure.

Description

Landing gear cabin door

Technical Field

The utility model relates to an aircraft undercarriage hatch door structural design especially relates to an undercarriage hatch door.

Background

In recent years, the domestic aviation industry is rapidly developed and is more precise.

In order to meet the increasing aerodynamic profile and structural weight reduction requirements, the landing gear fairing has a larger contraction profile than before. Thus causing the wheels to sink into the inner face of the landing gear bay, which has a dimple. The shape of the skin at the indent is complex.

SUMMERY OF THE UTILITY MODEL

The utility model provides an undercarriage hatch door can alleviate and take defects such as crackle that probably appears in the pressure forming process of pressure nest metal covering.

The utility model provides an undercarriage hatch door, include: composite laminated skin 100 and metal skin 400;

the composite laminated skin 100 is disposed at the indentation of the landing gear door interior surface; the metal skin 400 is provided on the inner surface of the landing gear door except for the dimples.

Optionally, the metal skin 400 is provided with a rectangular opening 401 at the indentation of the landing gear door interior surface, and the composite laminated skin 100 is provided at the rectangular opening 401.

Optionally, the landing gear door further comprises: a heading support structure 200 and a lateral support structure 300;

the course support structure 200 and the lateral support structure 300 are disposed within the landing gear door, and the composite laminated skin 100 is secured to the course support structure 200 and the lateral support structure 300.

Optionally, the landing gear door further comprises: a fastener 500;

the composite laminated skin 100 is secured to the course support structure 200 and the lateral support structure 300 by the fasteners 500.

Optionally, the landing gear door further comprises: a rubberized fabric cover 600;

the metal skin 400 is further provided with a circular opening 402 for assembly and maintenance, and the rubberized fabric cover 600 covers the circular opening 402.

Optionally, the composite laminated skin 100 sequentially includes, from inside to outside: a glass fiber reinforced resin insulation layer 101, a carbon fiber reinforced resin base layer 102, a carbon fiber reinforced resin reinforcement layer 103, a carbon fiber reinforced resin base layer 104, a carbon fiber reinforced resin reinforcement layer 105, a carbon fiber reinforced resin base layer 106, and a glass fiber reinforced resin insulation layer 107.

Optionally, the heading support structure 200 and the lateral support structure 300 are machined from a metal material.

Optionally, the metal skin 400 is made of metal through a sheet metal forming process.

The utility model discloses an undercarriage hatch door can exert the advantage that combined material integrated into one piece manufacturability is good, has overcome and has pressed defects such as crackle that probably appears in the area pressure nest metal covering pressure forming process, improves production efficiency, is convenient for detect and repair, and the specially adapted structure height is limited the wheel and is absorbed in the use scene in the hatch door structure.

Drawings

Figure 1 is an isometric view of a landing gear bay door of the present invention;

figure 2 is a top view of a landing gear bay door of the present invention;

FIG. 3 is a cross-sectional view I-I of FIG. 2;

FIG. 4 is detail II of FIG. 3;

figure 5 is an isometric view of a composite laminated skin for a landing gear bay door of the present invention;

figure 6 is a top view of a composite laminated skin for a landing gear door of the present invention;

FIG. 7 is a cross-sectional view IV-IV of FIG. 6;

FIG. 8 is a profile view of a composite laminate skin reinforcement for a landing gear bay door of the present invention;

FIG. 9 is a sectional view III-III of FIG. 2;

description of reference numerals:

10-a wheel;

20-landing gear bay door;

100-laminating a skin by using a composite material;

101-glass fiber reinforced resin insulation layer;

102-a carbon fiber reinforced resin base layer;

103-carbon fiber reinforced resin reinforced layer;

104-a carbon fiber reinforced resin base layer;

105-carbon fiber reinforced resin reinforcement layer;

106-a carbon fiber reinforced resin base layer;

107-glass fiber reinforced resin insulation layer;

200-course support structure;

300-lateral support structure;

400-metal skin;

401 — rectangular opening;

402-circular opening;

500 — a countersunk fastener;

600-gummed cloth cover.

Detailed Description

The landing gear bay door provided by the present invention will be described with reference to the accompanying drawings.

Figure 1 is the utility model relates to an axonometric drawing of undercarriage hatch door, figure 2 is the utility model relates to a plan view of undercarriage hatch door. As shown in figures 1 and 2 of the drawings,

the landing gear bay door 20 includes: composite laminated skin 100, course support structure 200, lateral support structure 300, metal skin 400, fastener 500, and impregnated cloth cover 600, wherein: composite skin 100 contains fiberglass reinforced resin insulation layers 101 and 107, carbon fiber reinforced resin base layers 102, 104, 106 and reinforcement layers 103, 105, and has dimples that match the profile of wheel 10.

The heading support structure 200 and lateral support structure 300 are machined from a metal material and also have dimples that match the contour of the wheel 10.

The metal skin 400 is made of metal by a sheet metal forming process, with a large rectangular opening 401 matching the composite skin 100 and a flanged reinforced circular opening 402 for maintenance. The cover 600 is circular and slightly larger than the opening 402, and is adhered to the treated metal skin 400 by glue.

The fasteners 500 are countersunk titanium alloy blind rivets used to connect the composite skin 100 with the course support structure 200, the lateral support structure 300, and to connect the composite skin 100 with the metal skin 400.

The area profile of the composite laminated skin 100 is a predetermined distance from the wheel profile. Illustratively, circular openings 402 may be provided in both the heading and lateral support structures within the enclosed area. The composite laminated skin 100 and the metal skin 400 may be assembled with a support structure using countersunk fasteners.

Fig. 3 is a cross-sectional view taken along line I-I of fig. 2, and fig. 4 is a detail II of fig. 3. As shown in fig. 3 and 4, the profile and wheel clearance h at the dimple arrangement is not less than 25 mm.

Fig. 5 is an isometric view of a composite laminated skin for a landing gear door of the present invention, fig. 6 is a top view of a composite laminated skin for a landing gear door of the present invention, fig. 7 is a sectional view from IV to IV of fig. 6, as shown in fig. 6 and 7, the composite laminated skin 100 is shaped as shown in fig. 6, and the layers are laid sequentially as shown in fig. 7. The carbon fiber reinforced resin base layer shape is shown in fig. 5. Alternatively, the glass fiber reinforced resin insulation layer 101 is as thin as possible compared to the glass fiber reinforced resin insulation layer 107 to reduce weight, the shape of which is shown in fig. 5.

Fig. 8 is a composite material layer laminated skin reinforcement layer outline drawing of the landing gear door of the present invention, as shown in fig. 8, the carbon fiber reinforced resin based reinforcement layer is used to reinforce the mechanical connection area, so as to satisfy the requirement of the mechanical connection of the composite material, and the shape is shown in fig. 8.

Optionally, the width of the intersection region of the composite material laminated skin 100 and the metal skin 400 is not less than 4.5D (D is the nominal diameter of the titanium alloy blind rivet fastener) +2 mm.

Fig. 9 is a sectional view taken along line III-III of fig. 2, and as shown in fig. 9, a circular opening 402 of a metal skin is not smaller than 90mm in diameter, when a countersunk head fastener 500 fails to connect, the failed fastener is taken out through the circular opening 402, and after the assembly is completed, the circular opening 402 is blocked by a treated cloth cover 600, see fig. 9.

Claims

1. A landing gear door, comprising: a composite laminated skin (100) and a metal skin (400);

the composite laminated skin (100) is disposed at a dimple of the landing gear door interior surface; the metal skin (400) is disposed on the landing gear door interior surface except for the dimples.

2. The landing gear door according to claim 1, characterized in that the metal skin (400) is provided with a rectangular opening (401) at the indentation of the landing gear door inner surface, the composite laminated skin (100) being provided at the rectangular opening (401).

3. The landing gear door according to claim 1, further comprising: a heading support structure (200) and a lateral support structure (300);

the course support structure (200) and the lateral support structure (300) are disposed within the landing gear door, and the composite laminated skin (100) is secured to the course support structure (200) and the lateral support structure (300).

4. The landing gear door according to claim 3, further comprising: a fastener (500);

the composite laminated skin (100) is secured to the course support structure (200) and the lateral support structure (300) by the fasteners (500).

5. The landing gear door according to claim 2, further comprising: a rubberized fabric cover (600);

the metal skin (400) is further provided with a circular opening (402) for assembly and maintenance, and the rubberized fabric cover (600) covers the circular opening (402).

6. The landing gear door according to claim 1, wherein the composite laminated skin (100) comprises, in order from the inside to the outside: the insulation layer comprises a glass fiber reinforced resin insulation layer (101), a carbon fiber reinforced resin base layer (102), a carbon fiber reinforced resin reinforcing layer (103), a carbon fiber reinforced resin base layer (104), a carbon fiber reinforced resin reinforcing layer (105), a carbon fiber reinforced resin base layer (106) and a glass fiber reinforced resin insulation layer (107).

7. The landing gear door according to claim 3, wherein the heading support structure (200) and the lateral support structure (300) are machined from a metallic material.

8. The landing gear door according to claim 1, characterized in that the metal skin (400) is made of metal via a sheet metal forming process.