JPH04163297A - Development type truss structure - Google Patents

Abstract

PURPOSE:To save the coupling rod of a truss forming member and to promote reduction of weight by forming a structure where first and second triangular trusses are combined together and making the structure developable into a structure in a geometrical shape under the extension state of first and second expandable drive members. CONSTITUTION:In a truss structure, a first triangular truss 10 is arranged approximately at a central part and second triangular trusses 20 are arranged in a state to be respectively assembled to the peripheral three faces of the triangular truss 10 to form a structure 30. The surface, positioned facing the triangular truss 10, of the triangular truss 20 is used in common with that of the triangular truss 10. A triangular combination member 12 is formed such that two coupling rods 11a having the same length as each other are rotatably coupled together and three truss elements 11 approximately at the central part of which a bent part is formed, are combined approximately in a triangular shape. The triangular truss 10 has a pair of the triangular combination members, and a coupling rod 11b is spanned between truss element joining spots, at each of which a pair of the triangular combination members 12 and 12 are combined together and between the coupling rod joining parts. Development is effected through operation of expandable drive members 13.... A second triangular truss 20 is also formed in a similar manner described above.

Description

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

(Prior Art) Conventionally, the method of constructing a truss structure in outer space is to load a folded structure from the ground onto a spacecraft, transport it to outer space, and then expand it in outer space. , a method of constructing it is being considered. As such a deployable truss structure, Japanese Patent Application Laid-Open No. 61-9
A two-dimensional structure called a deployable truss, which has a truss structure in which connecting rods are combined and connected in a box shape, is described in Japanese Patent No. 86'99.

However, in the above-mentioned deployable truss structure, the reliability of the deploying and folding operations and the weight of the structure depend on the number of rotatably connected connecting rods and the number of deploying/folding drive units. For example, if you configure a large diameter one,
There have been problems in that the reliability of unfolding and folding operations is reduced and the weight is very heavy. These problems become particularly serious when increasing the size required in the recent field of space exploration. For this reason,
In the future field of space development, it is urgent to improve the reliability of the unfolding and folding operations of truss structures, as well as to promote weight reduction.

(Problem to be solved by the invention) As mentioned above, in the conventional deployable truss structure,
The reliability of unfolding and folding operations is low, and the weight is heavy.

This invention was made in view of the above circumstances, and it is possible to simplify the structure, promote weight reduction, and achieve high-precision deployment/deployment.
It is an object of the present invention to provide a deployable statically fixed truss structure that can realize folding motion control.

[Structure of the Invention (Means for Solving the Problems)] The present invention combines truss elements having a bending portion approximately in the center in a substantially triangular shape, connects contact points rotatably, and folds the truss elements. Two triangular connecting members, each of which has a bent portion that can be freely bent at approximately the center between the bent portions and whose ends are rotatably connected, are arranged facing each other. A first triangular prism truss whose ends are rotatably connected by installing a connecting rod between the bent parts, and the first triangular prism truss is combined and connected to form a desired structure shape, Two triangular connecting members are arranged facing each other, in which the truss elements having a bending portion at approximately the center are combined in a substantially triangular shape, and the contact points are rotatably connected, and between the truss element connecting points of these triangular connecting members and A plurality of second triangular prism trusses whose ends are rotatably coupled by connecting rods installed between the bent portions, and a triangular connection between the triangular coupling members of the first triangular prism truss and the second triangular prism truss. One end is rotatably connected to one vertex of the triangular connecting member, and the other end is rotatably connected to the bent portion of the other truss element of the triangular connecting member. The structure is constructed between a plurality of first telescopic drive members that are extendable and retractable, and a triangular coupling member of the second triangular prism truss, and one end of the triangular coupling member is connected to a bending part of one of the truss elements of the triangular coupling member. a plurality of second telescoping driving members which are movably coupled and whose other ends are rotatably coupled to the bending portion of the other truss element of the triangular coupling member; A deployable statically fixed truss structure is provided with drive control means for controlling the expansion and contraction drive members in a predetermined correlation to control the folding and deploying operations of the first and second triangular prism trusses.

(Function) □ According to the above configuration, the structure in which the first and second triangular prism trusses are combined has a statically determined truss structure, and the first and second telescopic drive members are predetermined by the drive control means. The truss component including the first and second triangular coupling members is expanded or folded and accommodated, and the first and second telescopic drive members are expanded and contracted in the extended state. It is expanded into a structure of geometric shape. According to this, due to the truss structure, the number of connecting rods of the truss constituent members constituting the structure is reduced to the minimum, and the number of truss connection points is reduced, as well as the reduction of the first and second telescoping drive members. be done. Therefore, it is possible to effectively reduce the weight of the structure, and to ensure reliable control of unfolding and folding motions, thereby improving reliability of motion control.

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

FIG. 1 shows a deployable statically fixed truss structure according to an embodiment of the present invention, in which a first triangular prism truss 10 is located approximately at the center.
One is placed. Then, the second triangular prism truss 20 is arranged in combination on three sides around the first triangular prism truss to form a structure 30. The second triangular prism truss 20 is opposed to the first triangular prism truss 10 and is also used in common with the first triangular prism truss 10.

That is, as shown in FIG. 2, the first triangular prism truss 10 has two connecting rods 1.1a of the same length rotatably (bendably) connected, and has a bending part (connecting part) approximately in the center. (rod connection point)
A triangular connecting member 12 is constructed by combining three truss elements 11 forming a substantially triangular shape, each end of which is rotatably connected, and two triangular connecting members 12 are arranged at a predetermined interval. They are placed opposite each other. This triangular connecting member 12.12 has a connecting rod 1 between the mutual truss element connecting points and the connecting rod connecting portion.
1b are constructed and their ends are rotatably connected. The first triangular prism truss 10 has the apexes At of the pair of triangular coupling members 12.

A2. A3, Bl, B2. B3,) CI, C2, C3, Di are the connecting rod connection points of the lath element 11.

B2. If B3, B1 and CL, BJ and C2, B2
and C2, B2 and C3, B3 and C1, and B3 and C3, a first telescopic drive member 13 is installed, and each end is rotatably connected. This first telescopic drive control 13 is
For example, a drive motor (not shown) is built in, and the drive motor (not shown) is driven and controlled in response to a control signal from a command unit (not shown), thereby controlling the expansion and contraction drive.

The first triangular prism truss 10 also has a connecting rod connecting point (bending portion) CI of the truss element 11 of the triangular connecting member 12.
and C21, CI and C3, C2 and 03, and Dl and B2,
A bending part 14 whose substantially central part is bendable is installed between the DJ and B3, and between B2 and B3, and the ends thereof are rotatably connected to each other. The bending portion 14 maintains the triangular coupling member 12 in a desired unfolded state according to its bending angle.

The first triangular prism truss 10 has the minimum number of truss constituent members, and when applied to the equation M=3J-6, which represents a statically determined truss that is said to realize a truss structure, the connecting rod 11 a, 1 l
b.

Since the number of truss constituent members of the first telescopic drive member 13 and the bending portion 14 is M = 20, and the number of joints J = 12, it becomes 3O-3X12-6, and it is confirmed that a statically determined truss is formed. .

On the other hand, the second triangular prism truss 20 has two connecting rods 11a of the same length that are rotatable (bendable) as shown in FIG.
A triangular connecting member 12 is constructed in which three truss elements 11 are combined into a substantially triangular shape to form a bent portion (connecting rod connecting point) at approximately the center, and each end is rotatably connected. , two triangular coupling members 12 are arranged facing each other with a predetermined interval. A connecting rod 11b is installed between the truss element connecting points of the triangular connecting members 12, 12 and connecting rod connecting points (bent portions), and the ends thereof are rotatably connected. In this second triangular prism truss 20, each vertex of the triangular coupling member 12 is connected to El, B2°B3, Fl, F2. B3,
) Gl, G
2. G3, Hl.

Assuming H2 and H3, a first telescopic drive member 13 is installed between Fl and Gl, Fl and G2, F2 and G2, F2 and G3, B3 and G1, and B3 and G3, and each end is rotated. Connected for free movement. And this first triangular prism truss 2
0 triangular connecting member 12゜12 is connected to the connecting rod connecting point G2 of one truss element 11 and the other truss element 1.
A second telescopic drive member 15 is installed between the first connecting rod connecting points H3, G2 and HI SG3 and H1, and its ends are rotatably connected. These first and second telescopic drive members 13
', 15 has a built-in drive motor (not shown), for example,
This drive motor (not shown) is driven and controlled in response to a control signal from a command section (not shown), whereby the telescopic drive is controlled.

As described above, this second triangular prism truss 20 is assembled and connected to the three surrounding surfaces of the first triangular prism truss 10, respectively, to form a desired structure. At this time, these first and second triangular prism trusses 10 and 20 are combined so that their opposing surfaces are commonly used, and the total number of truss constituent members M=84 and the total number of connection points J=30.

It is verified from the above formula (1) that this structure 20 constitutes a statically determined truss structure.

In the above configuration, when the structure 30 is unfolded from the folded state shown in FIG. 4 to the state shown in FIG. The driving of the first and second triangular prism trusses 10 and 20 is controlled in a predetermined correlation corresponding to the first and second linear drive members 13 and 15. Then, in the first and second triangular prism trusses 10 and 20, the first and second telescopic driving parts +4'13. 11b, bent portion] 4 is unfolded into the geometrical shape shown in FIG.

In addition, in the unfolded state shown in FIG. 1, when folded and stored as shown in FIG. 4, the command unit (not shown)
A drive motor (not shown) is reversely driven with a predetermined correlation. Then, the first and second triangular prism trusses 10 and 20 are moved by the first and second telescopic drive members 1.
3.15 is reduced with a predetermined correlation, the triangular connecting member 12, connecting rod 11b1 bending rod 14
is folded and stored as shown in FIG.

In this manner, the deployable statically determined truss structure is constructed by combining the first triangular prism truss 10 of the statically determined truss structure with the three second triangular prism trusses 20 into a statically determined truss structure to form a desired structure 30. and its first and second triangular prism trusses 1
The first and second telescopic drive members 13 and 15 of 0 and 20 are telescopically controlled in a predetermined correlation, and the truss component is expanded or folded and accommodated. According to this, the connecting rod 11a of the truss component that constitutes the structure 30 due to its truss structure.

The number of bending rods 11b1 is reduced to the minimum, and the number of truss joints is reduced, as well as the number of telescopic drive members is reduced. Therefore, the weight of the structure 30 can be effectively reduced, and the control of unfolding and folding operations can be ensured, and the reliability of the operation control can be improved.

In addition, in the above embodiment, the first and second triangular prism trusses 1
Although the case has been described in which the truss elements 11 of 0 and 20 are rotatably connected to the two connecting rods 11a to form a bent portion approximately in the center, the present invention is not limited to this, and for example, the truss elements 11 of 2
It is also possible to construct the truss element by combining more than one connecting rod, and it is possible to construct a truss element having a bent portion approximately in the center by various configurations.

In addition, in the above embodiment, the structure 30 is constructed by combining three second triangular prism trusses 20 to the first triangular prism truss 10 into a statically determined truss structure. The number of triangular prism trusses 20 is not limited to this number, and it is possible to combine them into a statically determined truss structure.

Further, the structure 30 can be configured in combination with various geometric shapes including a parabolic shape.

Further, the structure 30 is not limited to one built in outer space, but can also be applied to various buildings built on the ground, such as various large halls and the retractable roof of an indoor stadium.

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.

= 14 = [Effects of the Invention As detailed above, according to the present invention, the structure can be simplified, weight reduction can be promoted, and highly accurate unfolding/folding operation control can be realized. It is possible to provide a deployable statically fixed truss structure.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a deployed state of a deployable statically fixed truss structure according to an embodiment of the present invention, FIGS. 2 and 3 are diagrams showing a part of FIG. 1, and FIG. FIG. 2 is a diagram showing the folded state of FIG. 1; DESCRIPTION OF SYMBOLS 10... First triangular prism truss, 20... Second triangular prism truss, 30... Structure, lla, llb... Connecting rod, 12 Triangular coupling member, 13.15... First and Second telescopic drive member, 14... bending rod. Applicant's agent Patent attorney Takehiko Suzue Figure 4

Claims (1)

[Scope of Claims] Truss elements having a bent portion at approximately the center are combined in a substantially triangular shape, and contacts are rotatably coupled, and approximately the center of the truss element is bendable between the bent portions of the truss element. Two square connecting members are arranged opposite each other, the ends of which are rotatably connected by constructing bent rods,
A first triangular prism truss whose ends are rotatably connected by installing connecting rods between the truss element joining points and the bending parts of these triangular joint members, and a first triangular prism truss that is combined and connected. The truss elements having a bent portion at approximately the center are combined in a substantially triangular shape, and two conformal connecting members are disposed facing each other and the contact points are rotatably connected. , a plurality of second triangular prism trusses whose ends are rotatably connected by installing connecting rods between the truss element joining points and between the bending parts of these triangular connecting members; It is installed between the square coupling members and between the square coupling members of the second triangular prism truss, and one end is rotatably coupled to one vertex of the square coupling member, and the other end is connected to the square coupling member. A plurality of telescopic first telescopic drive members rotatably connected to the bent portions of the other truss element of the member, and a conformal joint member of the second triangular prism truss. , one end is rotatably coupled to a bent portion of one truss element of the conformal coupling member, and the other end is rotatably coupled to a bent portion of the other truss element of the conformal coupling member. a plurality of second extendable and retractable drive members; and a drive control that controls the folding and unfolding operations of the first and second triangular prism trusses by driving and controlling the first and second extendable drive members in a predetermined correlation. A deployable statically fixed truss structure characterized by comprising means.