JP2013184574A - Fitting for fastening satellite body structure panel and satellite body structure panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the following problem in a sandwich panel used for an artificial satellite structure: a mass thereof becomes larger due to a large amount of components used because the sandwich panel with standard dimensions requires connection by a doubler or the like when a sandwich panel with dimensions larger than standard dimensions is applied and an additional fitting with bolt holes requires attachment of a fitting with bolt holes called an insert to fasten a web panel.SOLUTION: A fastening fitting with at least two bolt holes is bonded between a sandwich panel skin and a core and is fastened by using a bolt and a U-shaped fastening fitting bonded to the sandwich panel to thereby perform fastening between a patch of the sandwich panel and the sandwich panel. Thus, reductions in the number of component items and weight can be achieved.

Description

  The present invention relates to a fastening bracket used for fastening between satellite structure panels constituting a satellite structure of an artificial satellite (hereinafter referred to as “satellite”).

In general, the satellite structure panel that makes up the satellite structure uses a sandwich panel composed of a core material and an aluminum alloy skin. However, if the sandwich panel is larger than a standard size, the skin is not covered by the standard dimensions of the skin material. It is necessary to succeed.
In this case, at the joint part of the skin, a plate material of the same material as the skin called doubler is placed between the skin and the core material for the purpose of joining the skins, and the skin and the doubler, and the doubler and the core material are joined with an adhesive. By doing so, the epidermis is succeeded (for example, refer patent document 1).
In addition, when fastening two sandwich panels, a metal fitting called an insert with an embedded bolt hole is prepared for the first sandwich panel, and a U-shaped joint is attached to the second sandwich panel. A metal fitting is prepared and fastened with a bolt (see, for example, Patent Document 2).

Japanese Utility Model Publication No. 62-62599 (FIG. 3) JP 2007-245880 (FIG. 2)

  A conventional sandwich panel that requires a skin joint has a gap of several millimeters at the skin joint, resulting in a step. When it becomes the structure by which the adhesive surface of the insert for panel fastening is arrange | positioned in the level | step-difference part, the fall of the adhesive strength resulting from the level | step difference will be caused. For this reason, it is necessary to arrange the flange portion of the insert so as to avoid the skin joint portion, and there is a problem that the arrangement of the insert is restricted.

Furthermore, at least two or more inserts are required to restrain the rotational displacement of the sandwich panel in the fastening between the sandwich panels and transmit a large load generated when the satellite is launched. For this reason, there are problems that the number of parts increases and the mass increases.

  The present invention has been made in order to solve such problems, and aims to reduce the number of parts and reduce the weight by enabling the fasteners between the sandwich panels to be arranged at the positions of the skin joints. .

  The satellite structure panel fastening metal fitting according to the present invention is a satellite structure panel fastening metal fitting used for joining the sandwich panels as the outer skin panels of the satellite structure and fastening the web panel, wherein the metal plate and the metal A convex step portion provided in a strip shape along the longitudinal direction of the plate, and a through hole reaching from the step upper surface of the step portion to the bottom surface of the metal plate, the step lower surfaces on both sides of the step upper surface, Each sandwich panel is bonded and fixed to the skin of the sandwich panel, and the sandwich panel is connected to each other. The bolt is inserted into and fixed to the through hole and a metal fitting for fixing the web panel, thereby being fastened to the web panel. The

  According to the satellite structure panel fastening bracket according to the present invention, the joint of a plurality of sandwich panels equivalent to the outer skin panel and the sandwich panel equivalent to the web panel can be fastened simultaneously with one part, thereby reducing the number of parts and reducing the weight. Can be realized.

It is a figure ((a) perspective view, (b) sectional view) which shows the satellite structure panel fastening metal fitting (fastening metal fitting) which concerns on Embodiment 1. FIG. It is a figure which shows the detail of the junction part of the sandwich panel 5a which concerns on Embodiment 1, and the sandwich panel 5b, and the fastening part of the sandwich panel 6. FIG. It is a figure which shows the whole sandwich panel 5a and the sandwich panel 5b joined by the fastening metal fitting which concerns on Embodiment 1. FIG. FIG. 4 is an overall view of the sandwich panel 5a and the sandwich panel 5b joined by the fastening fitting according to Embodiment 1, and is a view showing the back side of FIG. 10 is a perspective view of a satellite structure panel fastening bracket (fastening bracket) according to Embodiment 2. FIG. It is a figure which shows the detail of the junction part of the sandwich panel 5a which concerns on Embodiment 2, and the sandwich panel 5b, and the fastening part of the sandwich panel 6. FIG. It is a figure which shows the whole sandwich panel 5a and the sandwich panel 5b joined by the fastening metal fitting concerning Embodiment 2. FIG.

Embodiment 1 FIG.
Hereinafter, the satellite structure panel fastening bracket (hereinafter referred to as “fastening bracket”) according to the first embodiment will be described with reference to the drawings.

FIG. 1 is a view showing a satellite structure panel fastening bracket (hereinafter referred to as “fastening bracket”) according to Embodiment 1, and (a) is a perspective view in a state of being placed on a core 3. b) is a sectional view.
As shown in FIGS. 1 (a) and 1 (b), the fastening bracket 1 is a metal plate having a convex shape in cross section, and has a convex shape at the central portion along the longitudinal direction of the flat metal plate. A step 1a (hereinafter referred to as “central step 1a”) is provided.
The height t1 of the step 1a, that is, the surface 100 corresponding to the height of the step 1a (hereinafter referred to as “step upper surface 100”) and the surfaces 101a and 101b corresponding to the lower portion of the step 1a (hereinafter referred to as “step lower surfaces 101a and 101b”). The difference in height position is about 0.5 mm. Further, the difference in height between the flat plate thickness t2, that is, the step bottom surface 101 and the bottom surface 102 of the fastening bracket 1 (hereinafter referred to as “metal bottom surface 102”) is about 0.5 mm.
The dimensions of the fastener 1 in the length × width (longitudinal direction) are about 50 mm × 1000 to 2000 mm. The length in the longitudinal direction of the fastener 1 is substantially the same as one side of the core material 3 to be described later. For example, an Al material is used as the material of the fastener 1.
The central step 1a is provided with a plurality of holes 9 penetrating from the step upper surface 100 to the metal bottom surface 102 along the longitudinal direction. A fixing bolt 7 is inserted into the hole 9 as will be described later.
As shown in FIG. 1A, the core material 3 and the doubler 8 below the fastening bracket 1 are also provided with a plurality of holes 31 at positions corresponding to the holes 9 provided in the fastening bracket 1. The structure is such that the bolt can be inserted in a state where the fastening member 1 is placed on the core material 3 and positioned. Since the head of the bolt 7 is inserted into the hole 31, the diameter is larger than that of the hole 9 of the fastener 1.

FIG. 2 is an enlarged view of the joint portion of the sandwich panel and the joint portion with the sandwich panel in the fastening fitting according to the first embodiment.
In FIG. 2, two sandwich panels, the sandwich panel 5 b on the left side of the figure and the sandwich panel 5 a on the right side, are connected using the fastener 1. Further, another sandwich panel 6 that is perpendicular to the sandwich panels 5a and 5b is connected to the fastening bracket 1 via a U-shaped fastening bracket 2 (hereinafter referred to as “U-shaped bracket 2”). Are fastened by bolts 7.

Sandwich panels are generally made in a standard size, and when a sandwich panel having a size larger than the standard size is required, it is necessary to connect a plurality of standard size panels.
In a satellite structure, a cylindrical central cylinder (not shown) is generally located at the center of the structure, and a web panel is provided in parallel to the central axis of the central cylinder. This web panel is fastened to the outer surface panel constituting the outer skin of the satellite structure at an angle of approximately 90 degrees.
In FIG. 2, sandwich panels 5a and 5b correspond to outer surface panels, and sandwich panel 6 corresponds to a web panel.

The sandwich panel 5a is configured by adhering the upper and lower surfaces of a honeycomb-shaped core material 3a made of an Al material or the like with an adhesive 10 with an upper skin 4au and a lower skin 4ad of the same Al material. The sandwich panel 5b and the sandwich panel 6 have the same structure.

In FIG. 2, the step lower surface 101 a of the fastener 1 and the upper skin 4 au of the sandwich panel 5 a are bonded and fixed by an adhesive 10. Further, the step lower surface 101 b of the fastener 1 and the upper skin 4 bu of the sandwich panel 5 b are bonded and fixed by the adhesive 10.
The bottom surface 102 of the fastener 1 is bonded to the adhesive 10 and the upper side surface of the core material 3c having the same honeycomb shape as reinforcement.
The lower surface of the core material 3c is bonded to the doubler 8 which is also a reinforcing material by an adhesive 10. The other surface of the doubler 8 is bonded to the lower skin 4ad of the sandwich panel 5a and the lower skin 4bd of the sandwich panel 5b with an adhesive.

Thus, by using the fastener 1 and bonding and fixing the fastener 1 and the upper skins 4au and 4bu of the sandwich panel, the sandwich panels can be connected and a sandwich panel larger than the standard size can be easily obtained. In FIG. 2, the sandwich panel 3 c and the doubler are provided under the fastener 1 for reinforcement. However, when the reinforcement is unnecessary, the sandwich panels may be connected only by the fastener 1.

FIG. 3 is a view showing a sandwich panel (outer skin panel) in a state where the sandwich panel 5a and the sandwich panel 5b are joined by the fastening fitting according to the first embodiment. In this way, the left and right sandwich panels 5a and 5b are joined with the stepped upper surface 100 of the fastener 1 appearing on one side. Moreover, the hole 9 provided in the fastener 1 is exposed on the front surface.
A portion 40 surrounded by a dotted line is a joint portion of the sandwich panel, and FIG. 2 is a detailed view thereof.
4 is a view showing the other side of the sandwich panel (outer skin panel) in a state where the sandwich panel 5a and the sandwich panel 5b shown in FIG. The formed hole 31 appears on the surface.

As shown in FIGS. 3 and 4, the fastener 1 is provided with a plurality of holes 9, and the core material 3 and the doubler 8 are provided with a plurality of holes 31 so as to penetrate the sandwich panel.
The fastening bracket 1 has a structure that can be fastened with another sandwich panel 6 (web panel 6) by inserting and fixing a bolt into the through hole.

That is, the fastening bracket 1 is provided with at least two holes 9 for inserting bolts into another sandwich panel 6 (web panel 6), and a female screw in which the sandwich panel 6 is joined in advance using the adhesive 10 is provided. After aligning the U-shaped fastening bracket 2 (hereinafter referred to as “U-shaped bracket 2”) with the position of the hole 9, the bolt 7 inserted from the hole 31 is connected to the hole 9 and the U-shape. The fastening fitting 1 and the U-shaped fitting 2 are joined by screwing into the female screw of the fitting 2.
As described above, the fastening bracket 1 can simultaneously realize the joint of a plurality of sandwich panels corresponding to the outer skin of the satellite structure and the fastening of the sandwich panel corresponding to the web panel having a substantially vertical positional relationship with the outer skin. It has a structure.

As described above, the fastening bracket 1 according to the present embodiment can simultaneously joint a plurality of sandwich panels corresponding to the outer skin and a web panel with a single component.

According to the fastening metal fitting according to the present invention, the joint of a plurality of sandwich panels corresponding to the outer skin panel and the sandwich panel corresponding to the web panel can be simultaneously achieved, so that the number of parts can be reduced and the weight can be reduced.
Furthermore, it is not necessary to avoid the sandwich panel joint corresponding to the outer skin, which is a restriction on the metal fitting for fastening the sandwich panel (web panel).

It should be noted that when the sandwich panel equivalent to the outer skin panel is joined, the step and the thickness of the upper skin 4 and the upper skin 4 au and 4 bu are adjusted to have the same height so that the surface of the upper surface 100 and the upper skin 4 au and 4 bu of the fastener 1 The protrusion of the material 10 may be suppressed as much as possible to eliminate the strength discontinuity.

Embodiment 2. FIG.
In the first embodiment, the joint between the sandwich panels corresponding to the outer skin panel and the sandwich panel corresponding to the web panel are fastened by using the fastener 1 and the U-shaped fastener 2. Similar effects can be obtained with the configuration shown in the form.

FIG. 5 is a perspective view of a satellite structure panel fastening bracket (fastening bracket) according to the second embodiment. In addition, the same code | symbol is attached | subjected to the structure equivalent to Embodiment 1, and the description is abbreviate | omitted.
In FIG. 5, the fastener 21 according to the second embodiment includes a metal plate 21c corresponding to the bottom surface and two vertical plates 21a and 21b standing perpendicular to the metal plate 21c. Each of the vertical plates 21a and 21b is provided with holes 22a, 22b, 22c and 22d at corresponding positions. As described above, the fastening member 21 includes the vertical plates 21a and 21b, and has a structure having a concave shape in part in the cross section.

FIG. 6 is an enlarged view of the joint portion of the sandwich panel and the fastening portion with the sandwich panel in the fastener 21 according to the second embodiment. In FIG. 6, two sandwich panels, the sandwich panel 5 b on the left side of the figure and the sandwich panel 5 a on the right side, are connected using a fastener 21.

FIG. 7 is a diagram showing the entire sandwich panel 5a and sandwich panel 5b joined by the fastener 21 according to the second embodiment. In this way, the vertical plates 21a and 21b of the fastening bracket 21 are installed perpendicular to the sandwich panels 5a and 5b, and a hole 22 is formed in each of the vertical plates 21a and 21b. In the second embodiment, it is not necessary to open the holes 31 in the core portion 3 and the doubler 8 as in the first embodiment.

In FIG. 6, an insert 11 having a hollow cylindrical shape is attached to a fastened portion at the end of another sandwich panel 6. The hollow portion of the insert 11 and the holes 22a, 22b, 22c, and 22d provided in each of the vertical plates 21a and 21b are aligned, and the bolt 7 is inserted.
As shown in FIG. 6, a nut is attached to one side of the bolt 7, and the sandwich panel 6 corresponding to the web panel is fastened to the fastening member 21.
In this manner, the fastening member 21 of the second embodiment can simultaneously carry out the joining of a plurality of sandwich panels corresponding to the outer skin and the fastening of the web panel with one component.

As described above, according to the fastening metal fitting according to the second embodiment, the joint of a plurality of sandwich panels equivalent to the outer skin panel and the fastening of the sandwich panel equivalent to the web panel can be achieved at the same time. Can be realized.
Furthermore, it is not necessary to avoid the sandwich panel joint corresponding to the outer skin, which is a restriction on the metal fitting for fastening the sandwich panel (web panel).

Further, the fastening member 21 is provided with two vertical plates 21a and 21b with holes for inserting bolts, and the holes 11 formed in the vertical plates 21a and 21b and the insert 11 fixed to the sandwich panel 6 corresponding to the web panel. Since it can be fixed with a nut through the bolt 7 after alignment with the hollow portion, there is no need to make a hole in the core material 3c or the doubler 8 below the fastening bracket 21 as in the first embodiment, and the sandwich panel 6 is fastened. The work process can be simplified.

1, 21 Satellite structure panel fastening bracket (fastening bracket), 1a step, 2 U-shaped fastening bracket, 3 core material, 4 skin, 5a, 5b sandwich panel (equivalent to outer skin panel), 6 sandwich panel (web) Panel equivalent), 7 bolts, 8 doublers, 9 holes provided in the fastener 1, 10 adhesive, 11 inserts, 12 nuts, 21a, 21b vertical plates, 22 holes provided in the vertical plates 21a, 21b, 31 cores Holes provided in the material 3 and the doubler 8, joints of 40 sandwich panels, 100 surface corresponding to the height of the step 1a (step upper surface), 101a, 101b surface corresponding to the lower portion of the step 1a (step lower surface), 102 fastener 1 Bottom of the bracket (bottom of the bracket).

Claims (3)

A satellite structure panel fastening bracket used for jointing web panels and sandwich panels between outer skin panels of a satellite structure,
A metal plate,
A convex stepped portion provided in a strip shape along the longitudinal direction of the metal plate;
A through hole reaching from the upper surface of the stepped portion to the bottom surface of the metal plate,
The lower surface of the step on both sides of the upper surface of the step is bonded and fixed to the skin of the sandwich panel, and the sandwich panels are joined together,
A satellite structure panel fastening bracket that is fastened to the web panel by inserting a bolt into the through hole and the bracket that secures the web panel. A satellite structure panel fastening bracket used for jointing web panels and sandwich panels between outer skin panels of a satellite structure,
A metal plate,
Two longitudinal plates provided at a predetermined interval in a direction substantially perpendicular to the upper surface of the metal plate along the longitudinal direction of the metal plate,
The upper surface of the metal plate is bonded and fixed to the skin of the sandwich panel, and the sandwich panels are joined together,
A through-hole is provided at the same location of the two vertical plates, and a web panel including an insert having a hollow cylindrical shape is installed between the two vertical plates,
A satellite structure panel fastening bracket, wherein a bolt is fastened to the web panel by being inserted into and fixed to a hollow portion of the insert and a through hole of the two vertical plates. A satellite structure panel, wherein the sandwich panel as an outer skin panel is connected and the web panel is fastened by the satellite structure panel fastening metal fitting according to claim 1.

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