JPS63284334A - Developed truss structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a lightweight deployable truss structure with high retractability.

[Conventional technology]

In recent years, the efficiency and reliability of space shuttles, Ariane rockets, etc. have improved, and economic benefits have been created for the use of space. In particular, large antennas are indispensable for communication in moving objects such as ships and vehicles.

Expansion truss structure methods for constructing this structure have been actively developed. On the other hand, there are plans to build a huge space base for scientific purposes, and the deployment truss structure as the basic structure of this base is an important development theme. This is because the unfolding structure method is believed to be the most economical way to construct huge structures in space.

Figure 7 shows the above development truss structure in the American academic journal rIE.
EE TRANSACTIONS ON ANTENN
ASAND PROPAGATIONJ A P-1
It was shown in Volume 7, No. 4 (1969). Figure 9 shows a conventional deployable truss structure. In Figure 9, 11) constitutes a triangular lattice on the upper and lower surfaces of this truss structure, and is a bending member that can be bent at the center. A diagonal member that supports the triangular lattice.

(3) is a connector that connects the bent portion (1) and the diagonal member (2) with a pin. Figure 8 is an enlarged view of part A surrounded by the broken line circle in Figure 7, and (4) is the connector (3).
A web provided around the bending member +11 and the diagonal member (2) are pin-coupled to the connector (3).

Figure 9 is an enlarged view of part B surrounded by the broken line circle in Figure 7, showing details of the central bent part of the bent member Il+, and (5) in Figure 1 shows the central part connected with a pin. A rotatable hinge lever (6) consisting of two plates is attached to one base of the hinge lever (5), and rotates the hinge lever (5) in the direction of unfolding the bending member +11. Spiral spring, (7) is the bending member Il+
The connecting pinches (7a) and (7b) that connect the hinge lever (5) to the hinge lever (51) and the bending member il+
(7C) is a connecting pin that connects the bent members (1) together at the center.

The above structure has a tetrahedral truss structure because it has a configuration in which a plurality of tetrahedrons made up of three bent members Il+, three diagonal members (2), and three connectors (3) are connected. Also called. FIG. 10 is a diagram showing the expansion truss structure in progress.

Next, the operation will be explained. The above-mentioned structure, which is initially restrained by a holding cable (not shown) in its stored form, becomes movable by cutting the holding cable with a detonator or the like in response to a command from the ground, and is expanded by the spring force of the spiral spring (6). Get started. For deployment, the hinge lever 151 is rotated by the spring force of the spiral spring (6), thereby extending the bending member 11) while rotating it around the connecting pin (7C). As the bending member (11) extends, the connectors (3) on the upper and lower surfaces expand radially and unfold. When the bending member il+ extends linearly, the spring force of the hinge lever (5) and the spiral spring (6) The rotational torque generated by
The contact surface pressure on the bent surface of the bent member (1) is balanced, and the bent member +11 stops moving. This is the developed shape, and the structure is connected only by a triangular lattice.

A triangular lattice is basically a rigid and stable structure, and conventionally this type of structure was considered to be very rigid and suitable for deployable antennas or structures for space bases.

[Problem that the invention seeks to solve]

However, in the conventional structure, the connection points of each member are not actually concentrated at one point, so the structure is flexible and cannot even maintain its own shape. In other words, a triangular lattice is rigid only when each member is connected at one point as shown in Figure 11, but in the conventional structure, this triangular lattice is rigid at many points as shown in Figure 12. (8) is the basic member constituting the triangular lattice.

(9) is a pin joint that connects the basic member (8).

(3) is the basic member (8) by the pin joint (9).
) is a connector that joins together.

As explained above, conventional deployable truss structures using bent members are fundamentally unstable structures.

There was a fatal problem in that the required rigidity could not be achieved in the structure of the deployable antenna or the space base itself.

The present invention has been made to solve the above-mentioned problems, and provides a deployable truss structure that is structurally stable and highly rigid in its deployed shape.

[Means for solving problems]

The deployable truss structure according to the present invention has a mandrel to which a connector having a pin joint part is connected at one end, a locking mechanism at the other end, and an engaging part that engages with the locking mechanism when deployed, a main sliding hinge;
It consists of three ribs that are pin-coupled at one end to the main slide hinge and extend radially, and the ribs are arranged so that adjacent stems are in opposite directions, and the ribs are connected to adjacent stems in opposite directions. A wire is attached to a plurality of skeletons connected to connectors, which are stretched between the connectors when expanded.

Further, in the deployable truss structure according to another invention of the present invention, a synchronous slide hinge is attached to the shaft, the synchronous slide hinge and the rib are connected using a synchronous beam, and a coil is connected between the synchronous slide hinge and the main slide hinge. It is equipped with a spring.

[For production]

In this invention, the wires stretched between the vertices that make up the tetrahedron create compressive force on the stem and ribs and achieve a force equilibrium state, so the looseness of the pin-connected parts disappears and the basic module The tetrahedron has a stable structure and can easily obtain high rigidity.

Further, in another aspect of the present invention, the valley tetrahedrons are expanded in synchronization with each other, thereby increasing the reliability of the expansion and eliminating the need for external energy to expand the tetrahedrons due to the force of the spring.

〔Example〕

FIG. 1 is a diagram showing an deployable truss structure in an unfolded configuration, showing an embodiment of the present invention, in which (3a) and (3b) are connectors having pin joints, and (3C) is a free end of the deployable transformer structure. A connector at the other end of the rib,
αQ is a mandrel with a connector (3) attached to the tip.

Adjacent mandrels are arranged with opposite axial directions. αυ is a main slide hinge that slides on the mandrel aaX, α2 is a rib whose one end is radially pin-coupled to the raw slide hinge αυ and can be expanded in a direction perpendicular to the axial direction of the mandrel, and Connector (3a) of
, and is pin-coupled to a connector (3b) attached to the adjacent shaft α1 in the opposite direction. Further, the rib that becomes the free end of the deployable truss structure is connected to a connector (3C).

αJ is the connector (s
a), (31)) between each other, between the connectors (3C) arranged at the free end of the deployable truss structure, and between the connectors (3a), (3b) mounted on the mandrel and the deployant This is a wire attached between the connectors (3C) arranged at the free end of the truss structure, and is set to be pulled when the deployable truss structure is expanded.

Figure 2 is an enlarged view of part 6 of Figure 1. In Figure 9, α4 is a stopper formed by a coil spring provided at the end of the mandrel QG, and α is the holding position of the main slide hinge aυ on the mandrel fIQ. A spring (not shown) interposed between the inside of the mandrel and the lock pin αS causes the lock pin to project outward from the mandrel and fit into a pin groove tie provided in the main slide hinge αυ. It has become. In the same figure, θ
indicates the angle formed by the shaft αυ and the rib α2, which is set to be around 90° when unfolded.

FIG. 3 shows a diagram of the deployable truss structure in the middle of deployment.

The unfolding operation of the deployable truss structure configured as described above will be explained below. The deployable truss structure of this invention is
When retracted, the connector 2 on the mandrel GQ (3a) and the main slide hinge aυ on the mandrel [1G].

Another connector 9, for example (3b), is connected to the other end of the rib α2 whose one end is pin-connected to the main slide hinge αυ.
The triangle whose three vertices are
When the main slide hinge συ is moved to the holding position side where the locking mechanism is located, the distance between the connection h (R3a) and the main slide hinge αυ increases, but J:, the connection (
The distance between 3a) and the other connector (3b) is the wire α
It is kept below a certain length at e.

Furthermore, the above-mentioned another connector (3b) and the above-mentioned raw slide hinge α
Since the distance between D is also maintained at the length of the rib α2, the triangle formed by the three vertices expands, and the angle θ formed by the rib α2 and the shaft α increases. When the angle θ between the rib O3 and the shaft Q[l increases, the other connector (3
b) and yet another connector 9 provided at the other end of another rib α2 whose one end is pin-coupled to the raw slide hinge αυ.
For example (5C), the distance between also increases. When the main slide hinge I reaches the predetermined holding position, the connector (
3a) and the above-mentioned another connector (3b), and the above-mentioned another connector (3b) and the above-mentioned further another connector (3C).
3 is strung up.

At the same time, the pin groove σ provided in the main slide hinge αυ
The lock pin α9 on the shaft is fitted to e, and the main slide hinge αυ hits the stopper α knob and receives a reaction force from the stopper ■, which is pressed against the lock pin αS and restrained in the expanded shape. As described above, in the expanded configuration, tension is imposed on the wire 03, and compressive force that balances the tension is generated on the shaft flG and rib αa, achieving a force balance state, and the expanded truss structure is stable and highly rigid. becomes.

Fig. 4 is a diagram showing an expanded truss structure in an expanded form showing another embodiment of this invention, and in Fig. 9, ση is a connector (3).
and the main slide hinge αυ, aa is the synchronous slide hinge ση
shows a synchronous beam with one end pin-coupled and the other end pin-coupled onto rib α2. Figure 5 is an enlarged view of the fourth drawing section.
+19 indicates a telescopic spring, and FIG. 6 is a diagram showing the deployable trust structure of the above-described another invention in progress. In FIGS. 4 to 6, (3), αO to αe are the same as those shown in FIGS. 1 to 3.

The deployable truss structure configured as described above is deployed by the strain energy of the telescopic spring a9 compressed by the synchronous slide hinge ση and the main slide hinge αυ when retracted, and the rib CX5 is further expanded by the synchronous beam a. are synchronized. Therefore, this deployable truss structure has the advantage of not requiring any external energy for deployment, and of being able to deploy with high reliability without worrying about tangles of wires (13) that tend to occur during asynchronous deployment. be.

〔Effect of the invention〕

As explained above, the present invention has the effect that high rigidity can be easily obtained because the wire is stretched between the vertices of each tetrahedron to create a structure without backlash.

Another invention of this invention incorporates a synchronization beam that synchronizes the deployment between the rib and the mandrel, and a telescopic spring that supplies the deployment energy, increasing the reliability of deployment and achieving deployment with its own blade. There is an effect.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram of a deployable truss structure after deployment showing an embodiment of the present invention, FIG. 2 is a diagram showing a member connection portion in an embodiment of this invention, and FIG. A diagram showing a shape in the middle of development. FIG. 4 is a diagram of the developed shape of an embodiment of another invention of this invention, FIG. 5 is a diagram showing a member joining part in another invention of this invention, and FIG. FIG. 7 is a diagram showing the shape of the conventional example after it has been expanded. FIG. 8 is a diagram showing the diagonal member joining part of the conventional example. FIG. 9 is a diagram of the triangular shape of the conventional example. FIG. 10 is a diagram showing the mechanism of the bending members of the lattice, FIG. 10 is a diagram showing the shape of a conventional example in the middle of development, and FIG. 11 is a diagram of a physical model of the triangular lattice conventionally considered. FIG. 12 shows an actual physical model diagram of a triangular lattice in a conventional example. In the figure, (11 is a bending member, (2) is a diagonal member, (3) is a connector, (4) is a web, (5) is a hinge lever, (6) is a spiral spring, and (7) is a coupling bin. , (8) is the basic member, (9) is the binge joint, α[ is the mandrel, αυ is the main slide hinge, α2 is the rib, (13 is the wire,
α4 is a stopper. αS is a lock pin, αe is a pin groove, σD is a synchronous slide hinge, U is a synchronous beam, (19 is a telescopic spring). In the drawings, the same reference numerals indicate the same or equivalent parts.

Claims (2)

[Claims] (1) A mandrel to which a connector having a pin joint part is connected at one end and a locking mechanism at the other end, the mandrel having an engaging part that engages with the locking mechanism when the deployment truss structure is deployed A main slide hinge that slides on the top, one end of which is radially pin-coupled to the main slide hinge, and three ribs that can be expanded in directions perpendicular to the axial direction of the mandrel, and the direction of the mandrel. a plurality of frames formed by arranging the ribs so that adjacent ones are in opposite directions, and connecting the ribs, excluding the ribs that become the free ends of the deployable truss structure, with connectors of mandrels oriented in opposite directions; and the connectors. between the other ends of the ribs that are the free ends of the deployable truss structure, and between the other ends of the ribs that are the free ends of the deployable truss structure and the connector, and the deployable truss structure is deployed. A deployable truss structure characterized by comprising a wire stretched between the respective parts. (2) A mandrel to which a connector having a pin joint part is coupled at one end and a locking mechanism at the other end, the mandrel having an engaging part that engages with the locking mechanism when the deployment truss structure is deployed; A main slide hinge that slides on top, one end of which is radially pin-coupled to the main slide hinge, and three ribs that can be expanded in directions perpendicular to the axial direction of the mandrel, one end of the mandrel and the main slide. A synchronous slide hinge that slides between the hinges, three synchronous beams whose one end is radially pin-coupled to the synchronous slide hinge and the other end is pin-coupled to the three ribs, respectively, and synchronous with the main slide hinge. A coil spring is provided between the sliding hinges, and the mandrels are arranged so that adjacent ones are in opposite directions, and the ribs other than the ribs that become the free ends of the deployable truss structure are arranged in opposite directions to each other. a plurality of frames connected by connectors, between the connectors, between other ends of the ribs serving as free ends of the deployable truss structure, and other ribs serving as the free ends of the deployable truss structure; A deployable truss structure characterized by comprising a wire between the ends and the connectors and stretched between the connectors when the deployable truss structure is deployed.