JP2002029497A - Seal structure of door for aircraft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal structure, capable of certainly sealing the outer peripheral surface of a vertically two-divided type door for an air craft and enabling the easy opening or closing of the door. SOLUTION: The two-divided type door D of which door opening O is opened or closed comprises an upper door half body 11 journalled at its upper end and a lower door half body 12 journalled at its lower end. The inner peripheral surface of the door opening O is provided with an annular first seal member 13 comprising an inflate seal expanding due to supply of compressed air, and the seal member seals a gap between it and the outer peripheral surface of the door D. The upper end of the lower door half body 12 is provided with a second seal member 32 comprising a straight hollow pipe like valve seal, and a striker disposed at the lower end of the upper door half body 11 elastically deforms the second seal member 32 to be crashed, thereby sealing a butting part between the upper door half body 11 and the lower door half body 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper door half having an upper end pivotally supported by an upper edge of a door opening and a lower end pivotally supported by a lower edge of the door opening to open and close a door opening of an aircraft fuselage. More particularly, the present invention relates to a seal structure for an aircraft door having the lower half door.

[0002]

2. Description of the Related Art Since the inside of a fuselage of an aircraft flying at a high altitude with a low air pressure is pressurized, it is necessary to seal a gap between a door opening and the door so that air inside the fuselage does not leak out of the aircraft. For example, flap seals, valve seals, and inflation seals are known as seal members for such aircraft doors. The flap seal is provided with a plate-shaped flap, and the tip of the flap is elastically brought into contact with a sealing surface of the other party to perform sealing. The valve seal is formed in a hollow pipe shape, and seals by elastically abutting against the other seal surface and flattening and crushing. The inflatable seal is capable of being expanded by receiving a supply of compressed air, and performs sealing by elastically abutting against a sealing surface of the other party by expansion.

US Pat. No. 4,321,153 discloses a flap seal, which is disclosed in Japanese Patent Application Laid-Open No. Hei 5-13199.
No. 2 discloses a seal combining a valve seal and a flap seal.

[0004] By the way, if the flap seal is not taken into consideration, not only the possibility of blow-through due to the pressure difference but also the problem is that the tip of the flap is easily damaged by contact with an object. Further, the valve seal generates a large frictional force or elastic force when it rubs against the sealing surface of the other party, so that there is a problem that a large force is required for opening and closing the door. On the other hand, the inflated seal shrinks when not sealed and does not rub against the sealing surface of the other party, so it can not only open and close the door lightly but also is less likely to be damaged by contact with an object, and the seal At times, it can be expanded by air pressure to exert a reliable sealing performance.

[0005]

As a door for a small airplane having a low height from the ground to the floor, an upper half door having an upper end pivotally supported by an upper edge of the door opening and a lower end below the door opening. There is known an upper and lower two-part type having a lower door half pivotally supported on an edge. In this manner, by dividing the door into two and providing a folding step on the inner surface of the lower door half, the lower door half can be used as a ramp for getting on and off.

[0006] When the inflatable seal is applied to such a vertically split door, the following problem occurs. That is, in order to bend the inflatable seal, a certain radius of curvature is required, but if it is attempted to attach annular inflatable seals to the outer peripheral surface of the upper door half and the outer peripheral surface of the lower door half, respectively,
At the lower ends of the upper door half and the upper ends of the lower door half, the inflatable seal must be bent at a right angle, making installation virtually impossible. When an annular inflatable seal is attached to the inner peripheral surface of the door opening and a linear inflatable seal is attached to the abutting portion of the upper and lower door halves, the end of the linear inflatable seal is attached. Cannot be sufficiently expanded, so that the sealing at the butted portion is incomplete.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a sealing structure capable of securely sealing the outer peripheral surface of an upper and lower two-part type aircraft door and opening and closing the door lightly. The purpose is to provide.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, an upper end is pivotally supported on an upper edge of a door opening of an aircraft fuselage so as to open and close the door opening. An upper door half and a lower door half pivotally supported at the lower edge of the door opening, the upper door half and the lower door provided on the inner peripheral surface of the door opening An annular first seal member that seals between the outer peripheral surface of the half body and a linear seal member that is provided at one of the lower end of the upper door half and the upper end of the lower door half and seals between the other end; A second seal member, wherein the first seal member is formed of an inflatable seal that expands by the supply of air and closely adheres to the outer peripheral surfaces of the upper door half and the lower door half, and the second seal member is hollow. It is composed of a valve seal with a cross section. That the seal structure of the aircraft door is proposed.

According to the above construction, since the first seal member made of the inflation seal is provided at the door opening, the upper and lower door halves and the lower door half and the door opening are expanded by expanding the inflation seal. Can be reliably sealed, and by contracting the inflatable seal, the frictional force generated between the inflatable seal and the upper and lower door halves can be eliminated, and the door can be opened and closed lightly. Can be. Further, since the second seal member made of a valve seal is provided at the butting portion of the upper door half and the lower door half, reliable sealing performance can be exerted over the entire length of the butting portion. Since the length of the seal portion formed by the second seal member is a very small part of the length of the entire seal portion, there is no possibility that the opening and closing of the door becomes heavy due to the frictional force or elastic force.

According to the second aspect of the present invention,
In addition to the configuration of the first aspect, there is proposed a seal structure for an aircraft door, wherein the expanded first seal member can contact both end surfaces of the second seal member.

According to the above construction, since the expanded first seal member abuts against both end surfaces of the second seal member, the portion where the butting portions of the upper and lower door halves are connected to the door opening can be more reliably formed. Can be sealed.

According to the invention described in claim 3,
In addition to the configuration of any one of claims 1 and 2,
A seal structure for an aircraft door, wherein a striker is provided on one of the lower end of the upper door half and the upper end of the lower door half, and the edge of the striker is elastically deformed so as to crush the second seal member. Is proposed.

According to the above construction, the second seal member is elastically deformed so as to be crushed by the edge of the striker.
The striker does not come into frictional contact with the second seal member, and the force required for opening and closing the door can be further reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 7 show an embodiment of the present invention. FIG. 1 is a perspective view of an airplane, FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1, and FIG. 4 is an arrow view, and FIG.
5 is an enlarged sectional view taken along line 5-5 of FIG. 3, FIG. 6 is an enlarged sectional view taken along line 6-6 of FIG. 3, and FIG. 7 is an enlarged view of a portion 7 of FIG.

As shown in FIGS. 1 and 2, a substantially rectangular door opening O is provided on a front side surface of a fuselage F of a twin-engine jet airplane.
The door opening O is opened and closed by the door D. The door D is curved in an arc shape as viewed in the front-rear direction, and is smoothly connected to a body F having a circular cross section.
The door D is divided into an upper door half 11 and a lower door half 12 by a dividing line extending in the front-rear direction. The upper end of the upper door half 11 is pivotally supported by hinges 13 on the upper edge of the door opening O. The lower end of the lower door half 12 is pivotally supported by hinges 14 at the lower edge of the door opening O. Therefore, when the door D is closed, the lower end of the upper door half 11 and the upper end of the lower door half 12 abut each other. Folding steps 15 and 16 are provided on the inner surface of the lower door half 12, and as shown by a chain line in FIG. 2, the steps 15 and 16 are extended while the lower door half 12 is open. , A ramp for use in getting on and off the occupant can be configured.

FIG. 3 shows a state where the inner surface of the door D without the lining is viewed from the inside of the body F. The upper door half 11 provided with the window 17 includes four first lock pins 19... And two second lock pins 2 connected to the operation lever 18.
The lower door half 12 includes four third lock pins 22... Connected to an operation lever 21. The first lock pin 19 and the second lock pin 2
Reference numerals 0 and 20 are connected to the operation lever 18 via a connection mechanism including an arm, a bell crank, a rod, and the like.
When the operation lever 18 is operated between the solid line position and the chain line position, the four first lock pins 19... And the two second lock pins 20, 20 advance and retreat simultaneously. The third lock pins 22 are connected to the operation lever 21 via a connection mechanism including an arm, a bell crank, a rod, and the like.
When the operation lever 21 is operated between the solid line position and the chain line position, the four third lock pins 22 move forward and backward simultaneously.

Thus, in the locked state of the door D shown in the drawing, the four first lock pins 19 of the upper door half 11.
Are fitted to the four receiving members 23 provided in the door opening O,
The two second lock pins 20, 20 of the upper door half 11 are fitted into two receiving members 24, 24 provided on the lower door half 12, and the four third locks of the lower door half 12. Pin 22
Are fitted to the four receiving members 25 provided in the door opening O. When the operating lever 18 is operated from the solid line position to the chain line position, the first lock pins 19 are disengaged from the receiving members 23 and the lock between the upper door half 11 and the door opening O is released, and the second lock is released. The pins 20, 20 are separated from the receiving members 24, 24, and the lock between the upper door half 11 and the lower door half 12 is released. When the operating lever 21 is operated from the solid line position to the chain line position, the third lock pins 22 are disengaged from the receiving members 25 and the lock between the lower door half 12 and the door opening O is released.

Next, the seal structure of the door D will be described with reference to FIGS.

In this embodiment, the space between the door opening O and the door D is sealed by the first seal member 31, and the space between the upper door half 11 and the lower door half 12 is sealed by the second seal member 32. . A seal holding member 33 having a channel-shaped cross section is fixed inwardly (to open toward the door D side) on the inner surface of the door opening O, and a first seal member held inside the seal holding member 33 is provided. Reference numeral 31 is formed of an annular inflatable seal. First seal member 3
The closed internal space 1 is connected to a compressed air source 34, and the first seal member 31 made of an elastic material contracts when air is not supplied from the compressed air source 34, and the inside of the seal holding member 33 contracts. When the air is supplied from the compressed air source 34, the seal lip 31a expands and the seal lip 31a protrudes outside from the seal holding member 33. When the first seal member 31 is expanded, the seal lip 31a is
To hermetically seal the space between the door opening O and the door D by contacting the outer peripheral surface (see FIGS. 4 and 6).

Since the door opening O of the airplane has four rounded corners in order to avoid stress concentration, the first seal member 31 made of an inflatable seal can be mounted without being sharply bent. Also, the first seal member 31
Is formed in an annular shape and does not have an end which is not easily expanded, so that each part can be expanded evenly and sufficient sealing performance can be exhibited.

A seal holding member 35 having a channel-shaped cross section is fixed to the upper end of the lower door half 12 so as to be open to the outside of the machine, and the second seal member 32 held inside the seal holding member 35. Is composed of a linear valve seal. The second seal member 32 is made of an elastic material pipe whose inside and outside communicate with each other by small holes 32a, and both ends closed by filling with the silicone resin 32b are formed on the outer periphery of the door D indicated by line AA in FIG. It protrudes slightly from the surface. On the other hand, a striker 36 having a channel-like cross section is fixed to the lower end of the upper door half 11, and the edge 3 of the striker 36 of the upper door half 11 is closed with the door D closed.
6a elastically deforms the central portion of the second seal member 32 of the lower door half 12 so as to crush it, and hermetically seals the butted portions of the upper door half 11 and the lower door half 12 (see FIG. 5).

As is apparent from FIG.
Both ends of the second seal member 32 closed by 2b
When the first sealing member 31 expands, the sealing lip 31a of the second sealing member 3
By biting into both end surfaces of 2, the sealing of the portion where the butting portion of the upper door half 11 and the lower door half 12 is connected to the door opening O is reliably performed. Therefore, the second
It is necessary that both end surfaces of the seal member 32 slightly project from the outer peripheral surface of the lower door half 12 indicated by line AA in FIG. 7 toward the first seal member 31.

When the first seal member 31 is expanded in a state where the upper door half 11 and the lower door half 12 are closed, the seal lip 31a of the first seal member 31 causes the upper door half 11 and the lower door half 11 to close. The sealing effect is exerted by elastically contacting the outer peripheral surface of the door half 12 (see FIGS. 4 and 6). When the door D is opened and closed, the first seal member 31
Is retracted into the seal holding member 33 to prevent the first seal member 31 from rubbing against the outer peripheral surfaces of the upper door half 11 and the lower door half 12, thereby generating a frictional force. The force required for opening and closing D can be reduced, and the first seal member 31 is brought into contact with another object.
Damage can be prevented.

When the lower door half 12 is first closed and then the upper door half 11 is closed, the edge 36a of the striker 36 provided on the upper door half 11 is
2 can be pressed against each other so that the butted portions of the upper door half 11 and the lower door half 12 can be reliably sealed. When the upper door half 11 is opened and closed, the striker 36 does not slide along the second seal member 32, but only the edge 36a abuts on the second seal member 32. Can be reduced.

As described above, the first seal member 3
When the first seal member 1 expands, the seal lip 31a
2, the portion where the butting portion of the upper door half 11 and the lower door half 12 is connected to the door opening O can be reliably sealed.

Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.

For example, in the embodiment, an airplane door is exemplified, but the present invention can be applied to other types of aircraft doors such as helicopters.

In the embodiment, a second seal member 32 is provided on the lower door half 12, and the striker 3 is mounted on the upper door half 11.
6 are provided, the positional relationship may be reversed, a second seal member 32 may be provided on the upper door half 11, and a striker 36 may be provided on the lower door half 12.

[0030]

As described above, according to the first aspect of the present invention, the first inflatable seal is provided at the door opening.
Since the seal member is provided, by inflating the inflatable seal, it is possible to reliably seal between the upper door half and the lower door half and the door opening, and by contracting the inflatable seal, The door can be opened and closed lightly without frictional force generated between the inflation seal and the upper and lower door halves. Further, since the second seal member made of a valve seal is provided at the butting portion of the upper door half and the lower door half, reliable sealing performance can be exerted over the entire length of the butting portion. Since the length of the seal portion formed by the second seal member is a very small part of the length of the entire seal portion, there is no possibility that the opening and closing of the door becomes heavy due to the frictional force or elastic force.

According to the invention described in claim 2,
Since the expanded first seal member abuts against both end surfaces of the second seal member, the portion where the butting portion of the upper door half and the lower door half continues to the door opening can be more reliably sealed.

According to the third aspect of the present invention,
Since the second seal member is elastically deformed so as to be crushed by the edge of the striker, the striker does not come into frictional contact with the second seal member, and the force required for opening and closing the door can be further reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of an airplane.

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1;

FIG. 3 is a view in the direction of arrows in FIG. 2;

FIG. 4 is an enlarged sectional view taken along line 4-4 in FIG. 3;

5 is an enlarged sectional view taken along line 5-5 of FIG. 3;

FIG. 6 is an enlarged sectional view taken along line 6-6 in FIG. 3;

FIG. 7 is an enlarged view of part 7 of FIG.

[Explanation of symbols]

 F body O door opening 11 upper door half 12 lower door half 31 first seal member 32 second seal member 36 striker 36a edge

Claims (3)

[Claims] 1. An upper door half (11) having an upper end pivotally supported on an upper edge of a door opening (O) to open and close a door opening (O) of an aircraft fuselage (F), and a door opening (O). ), A lower door half (12) pivotally supported at its lower end at the lower edge of the upper door half (1) provided on the inner peripheral surface of the door opening (O).
1) and an annular first seal member (31) for sealing between an outer peripheral surface of the lower door half (12), and a lower end of the upper door half (11) and an upper end of the lower door half (12). A second sealing member (32) that is provided on one of them and seals the other with the other, and the first sealing member (31) expands by the supply of air to expand the upper door half (11). ) And an inflation seal that is in close contact with the outer peripheral surface of the lower door half (12), and the second seal member (32) is formed of a hollow-section valve seal. Construction. 2. The expanded first sealing member (31) includes a second sealing member (31).
The sealing structure for an aircraft door according to claim 1, wherein the sealing member (32) can contact both end faces of the sealing member (32). 3. A striker (3) is attached to one of the lower end of the upper door half (11) and the upper end of the lower door half (12).
6), and the edge (36) of the striker (36) is provided.
The sealing structure for an aircraft door according to any one of claims 1 to 2, wherein the second sealing member (32) is elastically deformed so as to be crushed in a).