JPH04197896A - Truss structure - Google Patents

Abstract

PURPOSE:To attempt weight reduction and improvement of reliability in a truss structure suitable for an unfolding structure constructed in the space by rotating and unfolding connecting bars and diagonal members for forming a triangular pole truss element by movement of bonding portions of a triangular bonding member in the axial direction by means of a driving means. CONSTITUTION:When a structure 20 for forming a parabola antenna is constructed by six triangular pole truss elements 10; in respective triangular pole truss elements 10, three connecting bars 11 each of which includes a freely foldable intermediate portion are arranged into a delta shape, and a triangular bonding member 12 formed by rotatably connecting the bonding portion of the connecting bars is provided. A triangular pole truss 14 is constructed in such a manner that the two triangular bonding members 12 are oppositely arranged at predetermined intervals; driving members 13 for folding and unfolding are mounted between mutual bonding points of the connecting bars and bonding parts on both ends are rotatably connected to each other through a bonding member 11a. The driving members 13 have screw portions 13a, and diagonal members 17 of second triangular bonding members 16 are rotated in the unfolding direction by driving driven motors contained in the screw portions 13a. Thereby, the triangular pole truss 14 is unfolded.

Description

[Detailed description of the invention] [Object of the invention] (Field of industrial application) This invention is applicable to, for example, a space base constructed in outer space,
The present invention relates to a truss structure suitable for a deployable structure such as a parabolic antenna support structure provided on a platform or the like.

(Prior Art) In the field of space development, truss structures such as parabolic antenna support structures to be constructed in outer space are folded in advance on the ground, loaded onto a spacecraft, and transported to outer space. A method of constructing it by deploying it in outer space is being considered. As such an expandable truss structure, there is a development l.
Two-dimensional structures called laths are known,
All conventional deployable truss structures have a large number of components, including connecting rods, and it is difficult to reduce the number of components, for example, when forming a large deployable structure. , which had the problem of being extremely heavy.

This problem will become a big problem in the future field of space development (2) because it will become a big problem if we promote the large scale required in the recent separation of space development (2). In addition to ensuring high reliability in the folding operation, there is also an urgent need to promote weight reduction.

(Problem to be solved by the invention) As mentioned above, conventional truss structures have a problem in that they have many component parts and are heavy, making it difficult to increase the size. Ta.

This invention was made in view of the above circumstances, and aims to provide a truss structure that can simplify the configuration and promote weight reduction while ensuring high-precision motion control. purpose.

[Structure of the Invention] (Means and Effects for Solving the Problems) In this invention, connecting rods are provided in the middle portion to be freely bendable and are arranged in a triangular shape, and each connecting portion is rotatably connected. This triangular prism truss is made by truss-bonding triangular trusses in which two triangular connecting members are arranged facing each other, a driving member is installed between each connecting part of these triangular connecting members, and the ends are rotatably connected. Two connecting rods are arranged in a triangular shape on each side of one triangular connecting member, and a second triangular connecting member on the same plane is connected rotatably between the connecting rods. and a connecting portion of the second triangular connecting member on the triangular connecting member side is connected to the drive member so as to be movable in the axial direction, and the second triangular connecting member and the one triangular connecting member A structure formed by combining triangular prism truss elements in which diagonal members are respectively installed between the connecting parts of the members and each end thereof is rotatably connected, and the connecting part of the second connecting member is connected to the drive member. A truss structure comprises a connecting rod that controls movement in the axial direction of the triangular prism truss element to form the triangular prism truss element, and a drive means that folds and unfolds the structure by controlling rotation of the diagonal member about the drive member. did.

According to the above configuration, in the structure, the connecting portion of the second triangular connecting member is moved in the axial direction of the driving member by the driving means, so that the connecting rod and the diagonal member forming the triangular prism truss element are moved to the driving member. It is folded and unfolded by rotation control around the center. As a result, the number of components including the driving means that form the triangular prism truss element is reduced compared to the conventional cubic space truss, and the weight of the structure is reduced and highly reliable folding and unfolding operations are realized.

Further, the present invention provides two triangular connecting members in which connecting rods each having a bendable intermediate portion are arranged in a triangular shape and each connecting portion is rotatably connected, and these triangular connecting members are arranged oppositely. A triangular prism truss whose ends are rotatably connected is truss-connected, with a driving member installed between the joints.
Two connecting rods are arranged in a triangular shape with each side of one triangular connecting member of this triangular prism truss as one side, and are rotatable between the connecting rods and at the joint of one triangular connecting member. a second triangular connecting member on the same plane connected to each other; It is rotatably supported by the joint part of the triangular joint member 2,
A structure comprising a combination of triangular prism truss elements connected to a diagonal member whose other end is rotatable with respect to the drive member and supported movably in the axial direction; A truss structure is provided with a driving means for folding and unfolding the structure by controlling the movement of the triangular prism truss element and rotating the connecting rod forming the triangular prism truss element around the drive member.

According to the above configuration, in the structure, the driving means moves the other end of the diagonal member in the axial direction of the driving member, so that the connecting rod forming the triangular prism truss element is controlled to rotate about the driving member. It is folded and unfolded. This results in
The number of components including the drive means forming the triangular prism truss elements is reduced compared to conventional cubic space trusses, resulting in a lighter structure and a more reliable folding and unfolding operation.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a triangular prism truss element 10 used in a truss structure according to an embodiment of the present invention. For example, six triangular prism truss elements 10 are used to construct the structure in outer space as shown in FIG. The structures 20 are combined to form a parabolic antenna. In this structure 20, the opposing surfaces of six triangular prism truss elements 10 or adjacent trusses are shared, and a mesh antenna 21 (indicated by diagonal lines in FIG. 2) is stretched over one of the surfaces.

That is, the triangular prism truss element 1O has three connecting rods 11 of the same length each having a bendable middle portion, which are combined in a triangular shape, and the connecting portion connects the connecting member 11a as shown in FIG. A triangular coupling member 12 is formed by being rotatably connected through the triangular coupling member 12 .

Two of these triangular connecting members 12 are arranged opposite to each other with a predetermined interval, and a driving member 13 for folding and unfolding driving is installed between the joint points of the connecting rods, and the connecting portions at both ends thereof are connected to the connecting members. A triangular prism truss 14 rotatably connected via 11a is formed (see FIGS. 3 and 4). The driving member 13 of the triangular prism truss 14 is formed with a threaded portion 13a that can be rotated from one end to the middle portion. The threaded portion 13a has a built-in drive motor (not shown), for example, and is rotationally driven via this drive motor (not shown). The triangular prism truss 14 has two connecting rods 15 on each side of one of the triangular connecting members 12, with that side as one side.
are combined in a triangular shape to form second triangular connecting members -16- on the same plane, and the connecting portions on the open end sides of these second triangular connecting members 16 are connected to the connecting members as shown in FIG. They are rotatably connected via 15a. and,
The joint portion of the second triangular joint member 16 on the triangular joint member side is rotatably connected to the triangular prism truss 14 via a joint member 15b, as shown in FIG. It is screwed into the portion 13a so as to be movable in the axial (arrows A, B) direction (see FIG. 4). Further, a diagonal member] 7 is installed between the connecting portion on the other end side of the second triangular connecting member 16 and the connecting portion of the one triangular connecting member, and the connecting portions at both ends thereof are connected to the connecting member 15a. .

The triangular prism truss element 10 is formed by being rotatably connected via 17a.

In the above configuration, when a plurality of triangular prism truss elements 10 are combined and folded to unfold the structure 20, first, the plural triangular prism truss elements 1 are
The drive motor (not shown) of the drive member 13 of No. 0 is controlled to have a predetermined correlation, and the threaded portions 13a thereof are each rotationally driven. Then, as shown in FIGS. 6(d) to 6(a), the triangular prism truss element 10 connects to the connecting member 1 forming the second triangular connecting member 16.
5a or drive member] 3 and guided by the screw portion 13a of arrow A.
When the diagonal member] 7 is rotated in the direction of expansion, the triangular prism truss 14 is expanded, and accordingly, the entire structure 20 is expanded and the mesh antenna 21 is expanded (the diagonal member 7 is rotated in the expansion direction). (See Figure 2).

In addition, when the expanded structure 20 is folded and stored as shown in FIG. 2, the drive motor (
(not shown) is reversely driven and the screw portion 1 of the drive member 13 is rotated.
3a is inverted.

As a result, the structure 20 is guided by the threaded portion 13a of the second triangular coupling member [6] of the triangular prism truss element 10 or the threaded portion 13a of the drive portion]3, and is moved diagonally. When the member 17 is urged to rotate in the folding direction, the triangular prism truss 14 is folded, and the whole is folded and accommodated together with the mesh antenna 21 (see FIGS. 6(a) to 6(d)). ).

As described above, in the above-mentioned truss structure, the driving member 13 having the threaded portion 13a that can be freely rotated is provided on the vertical member of the triangular prism truss element 10 forming the structure 20, and the threaded portion of the driving member 13 is By rotating 13a with a certain correlation for each triangular prism truss element 10,
Each triangular prism truss element 10 is configured so that its constituent members are folded and unfolded, and the structure 20 is folded and unfolded, centering on the driving member. According to this, it is possible to reduce the number of structural members forming the structure 20 to a minimum compared to the conventional combination of three-dimensional trusses connected in a hook shape. Since it is possible to reduce the number of connection points and drive means, it is possible to promote weight reduction and ensure reliable operation. As a result,
This makes it possible to meet the demands for increased size and improved reliability, which is required in recent space development projects.

Note that the present invention is not limited to the above-mentioned embodiment, and it is also possible to configure the three-dimensional truss element 10a as shown in FIG. 7. However, here, the same parts as in FIG. 1 are given the same reference numerals, and the explanation thereof will be omitted.

That is, in the embodiment shown in FIG. 1, the triangular prism truss 14
The triangular prism truss element 10 was constructed by providing a second connecting member 16 extending from one of the triangular prism connecting members 12.
In the illustrated embodiment, the triangular prism truss element 10a has a triangular prism truss 14 arranged upside down, and two connecting rods 15 are attached to each side of the other triangular connecting member 12 of the triangular prism truss 14 in a triangular shape, with this side as one side. In combination, coplanar second triangular coupling members 16 are respectively formed. And the second
A diagonal member 17 is installed between the connecting portion on the open end side of the triangular connecting member 16 and the connecting portion of the one triangular connecting member 12, and one of the connecting portions is connected to the connecting member 15a.
(See Fig. 5). The other connecting portion of this diagonal member 17 is connected to the connecting member 1 as shown in FIG.
7b to the threaded portion 13a of the drive member 13 (arrow A).
.

B) They are screwed together so that they can move freely in the direction. The connecting rod 15 of the second triangular connecting member 16 is rotatably connected to the driving member 13 of the triangular prism truss 14 via the connecting member 15C, as shown in FIG. Concatenated.

In the above configuration, the triangular prism truss element 10a is driven by a drive motor (not shown) of the drive member 13 via a command unit (not shown), and the threaded portion thereof is rotationally driven. Then, the coupling member 1.7 on which one end of the diagonal member 17 is supported
b is the screw of the drive member 13.

By being moved and rotated in the axial direction (arrows A, B) along the portion 13H, the triangular prism truss 10 is connected to the triangular prism truss 10 via the connecting rods 15.11, as shown in FIGS. 10(a) to (d). Folded and unfolded.

Further, in each of the above embodiments, the driving member 13 is used as a driving means.
The triangular prism truss element 10. is configured to be folded and unfolded in conjunction with the rotational drive of the threaded portion 13a. It is also possible to configure the component 10a to be folded and unfolded by rotating around the drive member.

Furthermore, in the above embodiment, the case where the deployed position of the triangular prism truss element 10 is set by controlling the rotational position of the screw member 13a of the drive member]3 has been described as a representative example, but the present invention is not limited to this. , triangular prism truss element] 0 by appropriately setting the length dimensions of the connecting rods 11, 15, diagonal member 17, etc.

Furthermore, in the above embodiment, the explanation is given of the case where the structure is configured as a support structure for a parabolic antenna built in outer space, but the structure is not limited to this, and can be used as a support structure such as a deployable roof of an indoor stadium or the like built on the ground. is also applicable.

Therefore, it goes without saying that the present invention is not limited to the above embodiments, and that various modifications can be made without departing from the spirit of the invention.

[Effects of the Invention] As detailed above, according to the present invention, a truss structure is provided which ensures highly accurate motion control, simplifies the configuration, and promotes weight reduction. Can you provide?

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a triangular prism truss element constituting a truss structure according to an embodiment of the present invention, and FIG. 2 is a diagram showing a structure constructed using the triangular prism truss element shown in FIG. 1. Figure (a) is a plan view, Figure (b) is a side view, Figures 3 to 5 are views showing the details of the joint in Figure 1, and Figure 6 is the operation of Figure 1. Diagrams showing the state, Figures 7 to 1
FIG. 0 is a diagram shown for explaining another embodiment of the present invention. 10.10a...Triangular prism truss element, 11.15...
, connecting rod, 12... triangular coupling member, 13... drive member, 13a... screw portion, 14... triangular truss, 16. second triangular coupling member, 17... diagonal member, lla, 15a. 15b, 15c, 17a, 17b... coupling members. Applicant's Representative Patent Attorney Takehiko Suzue (a) Figure 2 (a) - WJG Figure (a) Figure 10 (b) Figure E (d) Figure 10 Figure 6-1

Claims (2)

[Claims] (1) Two triangular connecting members in which connecting rods with bendable middle portions are arranged in a triangular shape and each connecting portion is rotatably connected are arranged facing each other, and each of these triangular connecting members is A triangular truss is constructed by truss-joining a triangular truss in which a driving member is installed between the joints and the ends are rotatably connected, and each side of one triangular connecting member of this triangular prism truss has two
The connecting rods of the book are arranged in a triangular shape, and a second triangular connecting member on the same plane is formed by rotatably connecting the connecting rods, and the triangular connecting member side of the second triangular connecting member is formed. A connecting portion of the second triangular connecting member is connected to the drive member so as to be movable in the axial direction, and a diagonal member is installed between the second triangular connecting member and the connecting portion of the one triangular connecting member. A structure formed by combining triangular prism truss elements whose ends are rotatably connected; and a connection in which the joint portion of the second coupling member is controlled to move in the axial direction of the drive member to form the triangular prism truss element. rod,
A truss structure characterized by comprising: drive means for folding and unfolding the structure by controlling rotation of the diagonal member about the drive member. (2) Two triangular connecting members in which connecting rods with bendable middle portions are arranged in a triangular shape and each connecting portion is rotatably connected are arranged facing each other, and the connecting portion of these triangular connecting members is A triangular prism truss is constructed by truss-bonding a triangular prism truss whose ends are rotatably connected with a driving member installed between them. The connecting rods of the book are arranged in a triangular shape to respectively form a second triangular connecting member on the same plane rotatably connected between the connecting rods and to the connecting portion of one triangular connecting member;
The second triangular coupling member is installed between the second triangular coupling member and the coupling portion of the other triangular coupling member, one end is rotatably supported by the coupling portion of the second triangular coupling member, and the other end is supported by the coupling portion of the second triangular coupling member. A structure comprising a combination of triangular prism truss elements connected to a diagonal member that is rotatable relative to the drive member and supported so as to be movable in the axial direction; and a structure that controls the movement of the diagonal member in the axial direction of the drive member. A truss structure characterized by comprising: a drive means for folding and unfolding the structure by controlling rotation of a connecting rod forming the triangular prism truss element around a drive member.