JPH11240496A - Deployed truss structure and reflection mirror for antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance storability and reduce weight, and improve deployment reliability by providing a truss structure with plurality of sides and installing a link member which connects in a linked form plurality of sliding members to oblique members at ends thereof rotatably, and a spring member which provides a sliding force to plurality of side members specific to plurality of sliding members. SOLUTION: In this structure, a sum of a distance between hinges 54, 55 of a central longitudinal member 22 and a length of a lateral member 52 both of which constitute a four-side link and a sum of a distance between hinges 56, 57 of a longitudinal member 24 outside thereof and a length of a lateral member 53 are made equal so that this structure is foldable into a narrow and long quadrangular shape when accommodated. In addition, an amount change in length of a compression spring 80 fit between a sliding members 70 and 76 is made almost equal to the length of a link 75. The length of the link 75 is made shorter than that of a link 73 the length of which is half of that of the central longitudinal member 22, thereby weight of a spring is reduced. A support column 13 is disposed non-coaxially with a shaft portion 58 to prevent the wire from getting damaged or hindering deployment and accommodation operation. This enhances storability and deployment reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for a parabolic antenna mounted on an artificial satellite or the like and a deployable truss structure and an antenna reflector for forming a basic skeleton of a large space structure.

[0002]

2. Description of the Related Art When constructing large structures in outer space, astronauts are currently working on space shuttles and space station meals. It has the drawback that it is necessary to consider the damage and the cost is high, and the work period and the size of the building structure may be limited.

For this reason, recently, as a method of forming a large-scale structure in outer space, a deployment truss structure which automatically forms a structure by a driving force of a motor or the like has been studied in Japan and overseas.

In Japan, as a method of forming a large antenna in outer space, Japanese Patent Publication No. 8-255548 has already been used.
No. 7 and No. 8-2567164 No. 8-2
As described in Japanese Patent No. 567192, a system using a deployment truss structure is becoming common.

FIG. 9 shows an example of an antenna reflector using a conventional deployment truss with radial ribs.

The central vertical member 201 has a four-sided link 202
The horizontal members 203 and 204 and the outer vertical member 205 are rotatably mounted. The center vertical member 201 and the outer vertical member 205 have seven support columns 206a, b, c, d, e, and
f, g are attached, and the support columns 206a, b, c, d,
Between e, f, and g, there is a wire network 207 composed of a plurality of wires that are appropriately tensioned. The wire network 207 supports the mesh 208 along the parabolic surface.

FIG. 10 shows a four-sided link 202 of the deployment truss.
Shows a state in which the truss is stored along with the deployment and storage movement of the deployment truss.

As shown in the figure, support columns 206a and 206b are erected on the center vertical member 201 and the outer vertical member 205, and the length of the support columns 206a and b is equal to the length of the support columns 206a. When the length is shorter than the length of the support truss 206b, the distance between the tips of the support columns 206a and 206b becomes longer by storing the deployment truss.

In the example shown in FIG. 11, a reflecting mirror formed as an assembly of wires connected in a triangular shape has a mirror-surface-side end portion of a bar-shaped support column having six surrounding points and a mirror-surface side of a support column in the center of the antenna. The reflecting mirror surface is constituted by a back wire supported at the end and connected to the supporting structure side end of the support column so as to support the mirror surface shape. In this configuration, by adjusting the length of the tie wire that connects the back wire with high extension rigidity and the mirror wire with low extension rigidity, the wire length error,
It is considered that a stable mirror surface can be formed with respect to an error in the force for applying the wire tension.

[0010] The supporting structure of the reflecting mirror surface as shown in FIG. 12 has a supporting structure like an umbrella bone, and has a configuration in which a network is stretched between umbrella bones. In this configuration, the shape of the wire network is simple, and the wire supporting the reflecting mirror surface is composed of the circumferential wires. Therefore, it is considered that the deformation of the outer peripheral portion is small and the wire is not easily caught by the slack of the wire.

However, in the above-mentioned deployable truss structure, it is said that all of the above-mentioned deployable truss structures are intended to improve the storage efficiency by folding in consideration of the mountability to the rocket and that the number of constituent members is reduced to reduce the weight. It is designed for the purpose of improving single performance, and has the problem that it is difficult to satisfy the performance as a deployable truss structure comprehensively in terms of storage, weight reduction and deployment reliability. Was.

When the antenna reflector is formed by using the deployable truss structure, the distance between the tips of the support pillars 206a and 206b becomes longer as the deploying truss is stored, so that the mesh 208 follows the parabolic surface. As described above, the wire network 207 to which an appropriate tension is applied causes an increase in the tension of the wire connecting the tips of the support columns 206a and 206b, which breaks the wire and generates an unusual force when the wire is expanded and stored. There is a possibility that the storing operation may be hindered.

Further, when the antenna mirror surface is formed by using the deployable truss structure, the influence of the outer peripheral deformation and the pillow deformation is small, and when the wire forming the reflecting mirror surface is stored and deployed, excessive force is caused by the deployment operation of the support structure. However, there is a problem in that it is difficult to configure the antenna so as not to cover the antenna, and it is difficult to secure the reliability of the antenna deployment operation from this point.

[0014]

Any of the conventional deployable truss structures satisfies the overall performance required in the field of space development such as storability, light weight, and improved deployment reliability. It has the problem of being difficult.

Further, in the conventional antenna reflector, there is a fear that the tension of the wire is increased, the wire is broken, or an abnormal force is generated when the wire is deployed and stored, and the deploying and storing operation is hindered.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a deployable truss structure and an antenna reflecting mirror capable of improving the storability, weight reduction, and deployment reliability.

[0017]

According to the present invention, a quadrilateral structure in which ends of first to fourth quadrilateral members are rotatably connected in a quadrilateral shape is radially combined, and one of the diagonal lines of the quadrilateral structure is formed. A four-sided truss structure having first and second oblique members whose intermediate portions are rotatably bent and connected to each other, and a first four-sided member slidably mounted on the first four-sided member of the four-sided truss structure. , A first link member rotatably linking the end of the first slide member to the first and second oblique members, and a first four sides of the four-sided truss structure A second sliding member that is slidably mounted on a member at a position that does not interfere with the first sliding member, and an end portion of the second sliding member and the first link member that is rotatable. Between the first and second sliding members and the second link member coupled as It is location, to constitute a deployable truss structure and a spring member for applying a sliding force the first and second sliding member relative to the first quadrilateral member.

Further, in the deployed truss structure of the present invention, the four-sided truss structure is formed by a storage shape in which the first, second four-sided members and the third and fourth four-sided members are arranged in a substantially parallel state and face each other. The first and fourth four-sided members are configured so as to be capable of expanding and retracting movement until the four-sided member is in a four-sided expanded state.

Further, in the deployable truss structure according to the present invention, the connecting portion of the first four-sided member is rotatable between the first to fourth four-sided members at a distance between the two ends. The sum of the distance and the joint distance in the second four-sided member is substantially equal to the sum of the joint distance in the third four-sided member and the joint distance in the fourth four-sided member.

Further, in the deployed truss structure according to the present invention, in the connecting portion for rotatably connecting the ends of the first to fourth quadrilateral members, the connecting portion in the first and third quadrilateral members is , Are arranged so as to protrude from the center line of each member in the direction opposite to each other.

In the deployed truss structure according to the present invention, the connecting portion for rotatably connecting the third four-sided member and the end of the fourth four-sided member may be on the center line of the third four-sided member or at the center thereof. It was configured to be arranged on the side opposite to the first four-sided member with respect to the line.

Further, in the deployed truss structure of the present invention, the first oblique member is shorter than the second oblique member.

Further, the deploying truss structure of the present invention is configured to control the deploying and storing operation by controlling the position of the first sliding member or the second sliding member.

Further, in the deployable truss structure according to the present invention, a motor is provided near a connecting portion for rotatably connecting the first four-sided member and the end of the fourth four-sided member, and is coaxial with the motor. The deployed and connected pulley and the wire wound around the pulley are connected to the first sliding member or the second sliding member to control the unfolding and storing operation.

Further, in the deployed truss structure according to the present invention, the connecting portion of the first link member and the second link member may be rotated at both ends of the first link member while the four-sided truss structure is stored. With respect to the center line connecting between the parts to be freely connected, it is configured to be arranged on the opposite side to the first four-sided member.

Further, in the deployed truss structure of the present invention, the number of the second link members is smaller than the number of the first link members.

According to the above configuration, at the time of storage,
Since two members of the four members constituting the quadrilateral can be arranged substantially in a straight line, the overall size can be made compact in the above-mentioned stored state.

Further, the first and second springs for applying the expanding force are provided.
Between the sliding parts, and the first
Since the deployment force is transmitted to the four-sided member via the second link member and the first and second oblique members, the expansion and contraction distance of the spring accompanying the deployment and storage of the truss is reduced by the leverage of the link, As a result, the weight of the spring can be reduced.

In the connecting portion for rotatably connecting the ends of the first to fourth four-sided members, the connecting portion of the first and third four-sided members may be arranged from the center line of each member. By arranging the first and second slant members in the storage state by projecting in the opposite directions to each other, the first and second oblique members move inside the four joints arranged to project, and reduce the overall size. It can be stored compactly.

Further, the connecting portion for rotatably connecting the end of the third four-sided member and the end of the fourth four-sided member is provided on the center line of the third four-sided member or the first four sides with respect to the center line. By arranging it on the side opposite to the member, the outer shape of the four-sided member of the third four-sided member and the fourth four-sided member at the time of the storage can be made to have no irregularities, and the overall size can be made compact. .

Further, by making the first sloping member shorter than the second sloping member, the first and second sloping members can be stored during the storage.
Can be stored inside the four sides.

Further, the position of the first sliding member or the second sliding member is located near a connecting portion for rotatably connecting the ends of the first four-sided member and the fourth four-sided member. By controlling the arranged motor, the pulley installed coaxially with the motor, and the wire wound around the pulley, it is possible to make it easy to hold the deployed truss under gravity.

Further, when the deployed truss structure is in the storage shape, the portion connecting the first link member and the second link member is rotatably connected to both ends of the first link member. To the center line connecting the points
By arranging the second link member on the side opposite to the four side members, the thickness of the second link member can be increased, and the strength of the second link member on which the tensile force by the compression spring acts can be increased.

Further, by making the number of the second link members smaller than the number of the first link members, the weight of the deployed truss can be reduced.

Further, a plurality of the second to fourth quadrilateral members and the first and second oblique members are radially disposed with respect to the first quadrilateral member, and the same number of the first and the same or a small number are provided. By disposing the second link member on the first and second sliding members, a deployment truss structure having a substantially polygonal prism shape or a substantially polygonal pyramid shape can be formed.

Further, a combination structure can be formed by combining a plurality of deployment trusses having a substantially polygonal pillar shape or a substantially polygonal pyramid shape so as to combine the third quadrilateral members.

Further, the present invention provides a foldable deployable truss structure in which a plurality of four-sided members are combined in a radial direction to form a substantially polygonal prism or a pyramid, and a mesh for reflecting radio waves. A wire network configured by connecting wires for shaping a mesh into a desired curved surface, and a support column attached to the deployment truss structure and supporting the wire network, wherein the support column is an abbreviation of the deployment truss structure. The antenna reflecting mirror was constructed by disposing only at a portion corresponding to a corner point of the polygonal prism shape or the substantially polygonal pyramid shape.

Further, in the antenna reflector of the present invention, the mesh structure of the wire network is supported by a support structure such as a polygonal aggregate on the mesh surface. , A circumferential direction, and a wire net only in the direction perpendicular to the plane, and the other polygonal portions were constituted by wire nets in the radial direction, the circumferential direction, and the direction perpendicular to the plane.

Further, in the antenna reflector according to the present invention, the network wire is attached to the deployment truss structure via an attachment member arranged at a predetermined inclination angle at a position where the network wire and the deployment truss structure are adjacent to each other. It was configured to be.

According to the above configuration, a deployed truss structure having a substantially polygonal pillar shape or a substantially polygonal pyramid shape, a mesh for reflecting radio waves, and a wire formed by connecting the mesh for shaping the mesh into a desired curved surface. In an antenna reflector having a network and a supporting column attached to the deployed truss structure and supporting a wire network, the supporting column is positioned at a point of the substantially polygonal prism shape or the substantially polygonal pyramid of the deployed truss structure. Since the antenna reflector is configured to be installed only in the corresponding part, the tension of the wire rises by extending the distance between the tips of the support columns due to the deployment and storage operation of the deployment truss structure, and the wire may be damaged. , Does not hinder the deployment and storage operation.

Further, the mesh reflecting mirror surface is held down by a wire net constituted like a polygonal aggregate, and the polygonal portion supported by the outer peripheral support structure is formed by a wire net only in the circumferential direction and in the direction perpendicular to the surface. By configuring the other polygonal portion with a wire net in the radial direction, the circumferential direction, and the perpendicular direction to the surface, deformation of the outer peripheral portion of the reflecting mirror surface is reduced.

Further, a structure in which the member is connected to the wire at a position where the network wire and the support structure member in the radial direction are adjacent to each other, and the wire is stored and deployed in accordance with the storage and deployment operation of the support structure; Provides an antenna support structure that can secure a highly accurate reflecting mirror surface without excessive force acting on the wire during storage and unfolding operation because the wire connection part is connected to the support member at an angle to the support member. it can.

[0043]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an example of an antenna reflector using a deployed truss structure with radial ribs according to the first embodiment of the present invention.

As shown in FIG. 1, the deployed truss structure according to the embodiment of the present invention has a substantially hexagonal prism shape.
When a curved surface such as a parabolic antenna mirror surface is formed, the size of the upper surface and the lower surface of the hexagonal prism are different, and in this embodiment, the hexagonal shape on the lower surface is larger than the hexagonal shape on the upper surface.
It has a truncated pyramid shape. The configuration of the deployment structure of the present invention includes a mesh 11 serving as an antenna reflecting mirror surface, a wire 12 maintaining the shape of the mesh, a reflecting mirror surface portion 14 including the wire 12 and six supporting columns 13 supporting the mesh 11. And a deployment truss 20 supporting the reflecting mirror surface portion 14.

FIG. 2 shows a deployed truss structure constituting the antenna reflector of the present invention. As shown in the figure, the six four-sided links 21a, b, c, d, e, and f are combined so as to share the central vertical member 22, and constitute a truncated hexagonal pyramid 20.

The deployed truss 20 is called a module 23. A vertical member 24 outside the module 23 having a truncated hexagonal pyramid shape
Outside the a, b, c, d, e, and f, module coupling hinges 25a, b, c, d, e, and 26a, b, c, d,
e and f are attached.

FIG. 3 shows the module 23 shown in FIG.
Fig. 2 shows a deployment truss 30 which is configured by combining them. The deployment truss 30 connects the plurality of modules 23 to the module connecting hinge 2.
5a, b, c, d, e, f and 26a, b, c, d, e,
It is constituted by rotatably connecting by f. The hexagonal points 31a, b, c, d, e, and f on the upper surface of the individual modules 23 constituting the deployment truss 30 may directly constitute a parabolic surface.

However, in the deployment truss 30 shown in FIG.
Points 31a, b, c, d, e, and f are
, The basic dimensions of the four-sided links 21 are the same, and the angle formed by the planes including the center line of the four-sided links 21 is about 2 to 3 degrees or less than 60 degrees obtained by dividing 360 degrees by the number 6 of the four-sided links 21. By increasing or decreasing, it is configured to be present on the same spherical shape.

In order to satisfy the function of the parabolic antenna, the mesh 11 must be on the parabolic surface, but by setting the length of the support column 13 to an appropriate value, the points 32a, 32a, b, c, d, e, and f are set to be points on the parabolic surface.

As described above, the deployment truss 30 shown in FIG.
Is an aggregate of the deployed truss 20 shown in FIG. 2. To configure an antenna reflector using the deployed truss 30,
The points 32a, b, c, d, e, at the tip of the support column 13 of FIG.
f may be set individually for each module so as to be a point on the parabolic surface.

The cable supporting the mesh 11 is held by the wires 12 so that the mesh has a parabolic surface as described above. The wires 12 are the surface wire 40 and the surface wire 40 that directly support the mesh 11. A support wire 41 located closer to the deployment truss 20 and a surface wire 40
And a tie wire 42 connecting the support wire 41 or the four-side link member.

The surface wire 40 is a tie wire 4
By being connected to the support wire 41 or the four-side link member by 2, the point on the surface wire 40 is set to be a point on the parabolic surface.

Each wire is loosened and mesh 1
Appropriate tension is applied in a state where the deployment truss 20 is deployed so that the posture of No. 1 does not change.

Further, in the deployment truss 20, as shown in FIG. 1, the lower point of the outer vertical member 24 adjacent to the upper point of the outer vertical member 24, the outer point adjacent to the lower point of the outer vertical member 24 The cross wires 43 are stretched so as to connect the upper points of the vertical members 24 of the
In order to prevent the posture of the deployment truss 20 from being loosened, an appropriate tension is applied in a state where the deployment truss 20 is deployed.

Further, the intersection 4 of the cross wires 43
4 may be fixed.

Furthermore, if the intersection point 44 is connected to the central vertical member 22 via the extension spring 46, tension can be applied to the cross wire 43 with a very small force of the extension spring 46.

Further, the cross wire 43 may be stretched so as to connect upper and lower portions of the outer vertical member 24 to each other.

FIG. 4 shows the structure of the six four-sided links 21a, b, c, d, e, f constituting the deployed truss 20. A horizontal member 52 and a horizontal member 53 are rotatably supported via hinges 54 and 55 substantially along the mesh 11 from the central vertical member 22. The hinges 56 and 57 are provided at the ends of the horizontal members 52 and 53 in the same manner as the central vertical member 22.
The outer vertical member 24 is supported rotatably via the.

The above-mentioned six support columns 13 are configured to be joined to the outer vertical member 24.

The four-side link 21 connects the sum of the distance connecting the hinges 54 and 55 of the central vertical member 22 and the length of the horizontal member 52 and the hinges 56 and 57 of the outer vertical member 24 constituting the four-side link 21. It is configured such that the sum of the distance and the length of the horizontal member 53 is substantially equal.

Further, as shown in FIG.
Between the center line of the shaft portion 58 and the rotation center of the hinge 55, and similarly, the shaft portion 5 of the outer vertical member 24.
9 and the center of rotation of the hinge 56 are separated from each other.

A central vertical member 22 is provided inside the four-sided link 21.
The oblique member 61 rotatably attached to the horizontal member 53 via a hinge 60 and the oblique member 63 rotatably attached to the horizontal member 53 via a hinge 62 are rotatable with each other via a hinge 64 at each end. It is attached to become. A sliding member 70 is slidably attached to the center vertical member 22 with respect to the center vertical member 22.
The hinges 71 and 72 are attached to the and the oblique member 61, respectively, and a link 73 is rotatably supported by the hinges 71 and 72. The link 73 includes a hinge 71,
A hinge 74 is provided at a position deviated from the straight line connecting the 72, and a link 75 is rotatably supported on the link 73 by the hinge 74.

The length of the link 73 and the oblique member 61 is about half of the length of the central vertical member 22, whereas the length of the oblique member
3 is approximately equal to the sum of the lengths of the half of the central vertical member 22 and the length of the horizontal member 52. On the other hand, a sliding member 76 different from the sliding member 70 is slidably attached to the central vertical member 22, and a hinge 77 is attached to the sliding member 76, The link 75 is rotatably supported by the hinge 77.

A compression spring 80 is engaged between the sliding member 70 and the sliding member 76.

The above-mentioned compression spring is used for the sliding member 70 and the sliding member 7.
6 to spread the oblique member 61.
A link group constituted by the link 73 and the link 75 operates in the same manner as the automatic opening mechanism. The sliding member 70 and the sliding member 76 move in the direction A in FIG. 4, and the hinge 64 moves in the direction B in FIG. , Move away from the central vertical member 22.

The position of the hinge 62 of the four-sided link at this time is such that, with respect to the position of the hinge 64, the locus of the hinge 62 when the oblique member 63 is freely rotated from the hinge 64 and the four-sided link 21 are freely moved. At the intersection of the locus of the hinge 62 attached to the horizontal member 53 at the time of
The shape of the four-sided link 21 which originally has one degree of freedom is uniquely determined. Since the position of the hinge 64 now moves in the direction B in FIG. 4, the oblique members 61 and 63 approach a straight line, and the distance between the hinges 60 and 62 at the diagonal positions of the four-sided link 21 increases. , The four-sided link 21 is deployed and the deployed truss 20 is deployed.

Therefore, the compression spring is used as the sliding member 70.
And the sliding member 76 is moved to push and spread, so that the deploying truss 20 deploys.

Further, the control member 8 is connected to the sliding member 70.
1, a control motor 82 is mounted on the opposite side of the central vertical member 22 from the reflection mirror surface portion 14, and a control wire 81 is mounted on a pulley 83 mounted coaxially with the rotation axis of the control motor. I have. The control motor 82 controls the movement of the sliding member 70 by winding the control wire 81 around a pulley 83 coaxial with the motor, and controls the movement of the four-side link 21 and the four-side link 2.
The unfolding and storing operation of the unfolding truss 20 constituted by one combination is controlled.

In the above-described embodiment, as described above, the support columns 13 joined to the outer vertical members 24 in the deployment truss 20 are provided only at the positions corresponding to the corner points of the substantially polygonal pyramid. Thus, the support column 13 is not provided coaxially with the shaft portion 58 of the central vertical member 22.

The tie wire 42 supporting the surface wire 40 is joined to the horizontal member 52 by an attachment portion 90.
As shown in FIG. 4, a straight line perpendicular to a straight line connecting intersections 93 and 94 of the tie wire and the surface wire adjacent to the straight line connecting the first and the second 92 and the tie wire and the surface wire is tilted in the direction indicated by the arrow C in FIG. Installed. The inclination angle is about 20 degrees.

Surface wire 40 and tie wire 4
2 are joined by an attachment portion 95. The attachment portion 95 is connected to the surface wire 40 as shown in FIG.
Mounting part 96 of the tie wire 42 and the mounting part 97 of the tie wire 42
The tie wire 4 is tilted.
Even if 2 is inclined, no inclination occurs in the surface wire 40.

FIG. 5 shows a state in which the deployed truss 20 is stored and the four-sided link is folded.

As described above, the link 73 has the hinge 7
The hinge 74 is provided at a position deviated from the straight line connecting the hinges 1 and 72, but as shown in FIG. It is configured to be on the opposite side of the member 22.

According to the above-described embodiment, the outer vertical member 24 makes a quarter-circle movement with the radius substantially equal to the horizontal member 52 or the horizontal member 53. Spring 80 fitted between the sliding member 76 and
4 is approximately the same as the length of the link 75, and the length of the link 75 is shorter than the length of the link 73, which is approximately half the length of the central vertical member 22, as shown in FIGS. To
When the four-sided link is moved, the amount of change in the length of the spring, which is the point of force, can be reduced, and the amount of work of the spring can be suppressed, so that the weight of the spring can be reduced.

Further, as in the above embodiment, the sum of the distance connecting the hinges 54 and 55 of the central vertical member 22 and the length of the horizontal member 52 and the hinges 56 and Since the sum of the distance connecting the 57 and the length of the horizontal member 53 is substantially equal, the four-sided link can be folded into an elongated rectangular shape when the deployment truss 20 is stored as shown in FIG.

Further, as shown in FIG. 5, there is a distance between the shaft portion 58 of the central vertical member 22 and the rotation center of the hinge 55, and similarly, there is a distance between the shaft portion 59 of the outer vertical member 24 and the rotation center of the hinge 56. Thus, the oblique members 61 and 63 in the stored state can be stored in the gap 100 generated by these distances.

In the above embodiment, the four-sided link 2
In order to reduce the outer irregularities of the outer member 1, the outer vertical member 24
The center line of the shaft portion 59 is aligned with the rotation center of the hinge 57 because the diameters of the shaft portion 59 of the outer vertical member 24 and the shaft portion 101 of the horizontal member 53 are the same. When the shaft portion 59 is made thicker than the shaft portion 101 in order to withstand the tension of the surface wire 40 and make the mesh 11 coincide with the parabolic surface, as shown in FIG. By moving the outer side of the link, irregularities on the outer side of the four-sided link 21 can be reduced as in the present embodiment.

Further, since the oblique member 61 is shorter than the oblique member 63, the oblique member 61,
63 can be stored.

Also, from the symmetry of the deployed truss 20 shown in FIGS. 1 and 2, it is needless to say that the center of gravity of the deployed truss 20 is on the center line of the central vertical member 22.
By mounting the control motor 82 on the opposite side of the second reflecting mirror surface portion 14, when holding the deployment truss 20 under gravity, simply suspending the central vertical member 22 with a wire to raise the reflecting mirror surface portion 14 or It can be directed downward, which makes it easier to compensate for gravity when measuring the planar accuracy of the reflecting mirror surface portion 14.

Further, a small hole having a diameter of about 10 mm may be provided in the central portion of the mesh 11 in order to suspend the deployment truss 20 with the reflecting mirror surface portion 14 facing upward.

Also, as shown in FIG. 5, when the deploying truss 20 is stored, the hinge 74 is arranged so as to be on the opposite side to the central vertical member 22 with respect to the straight line connecting the hinges 71, 72. Since the link 75 on which the pulling force acts can be made thicker by 80, the link 75
There is no fear of damage.

In this embodiment, the number of the links 75 is the same as the number of the links 73. However, at least one link 75 that connects the sliding member 70 and the sliding member 76 as a rotatable link is provided. If only exists, it functions as an automatic opening mechanism.

However, if the number of links 75 is reduced to one,
The link group constituted by the slant member 61 and the links 73 and 75 is used by the automatic opening mechanism to form the shaft 58 of the central vertical member 22.
When the deployment truss 20 is deployed and stored, the sliding portion 76 is pressed in a direction perpendicular to the shaft portion 58, and the frictional force for moving the sliding portion 76 increases.

Therefore, it is desirable to provide two or more links 75 at least substantially symmetrically with respect to the shaft portion 58.

FIG. 6 shows an overview of a satellite equipped with a deployable antenna having a large aperture diameter by combining the deployable truss 30 shown in FIG. 3 with the reflector 14. Thus, the module 23 shown in FIG.
Can be configured as a large deployable truss 30. By combining this with the reflecting mirror surface section 14, it can be used as a reflecting mirror of a deployable antenna having a large aperture diameter.

In FIG. 6, when the large deployable truss 30 attached to the boom 110 is deployed and moved, the boom 110 receives a reaction force of the movement of the center of gravity due to the deployment of the large deployable truss 30. By controlling the deployment of the plurality of deployment trusses 20 by the control motor 82 to extend the time required for deployment, the maximum value of the reaction force can be suppressed low, and the load on the boom 110 can be reduced. Therefore, the structure of the boom 110 can be simplified, and as a result, the weight of the boom 110 can be reduced.

Further, in the above-described embodiment, as described above, the support columns 13 joined to the outer vertical members 24 in the deployment truss 20 are installed only at the portions corresponding to the corner points of the substantially polygonal pyramid shape. Since the support column 13 is not provided coaxially with the shaft portion 58 of the central vertical member 22, the support column 13 joined to the outer vertical member 23 becomes vertical during storage as shown in FIG. 5, even if the surface wire 40 is pulled upward in FIG.
Since the midpoint 120 is not fixed by the supporting column, the midpoint 120 can move upward in FIG. 5, and the tension of the surface wire 40 increases, which breaks the wire and hinders the deployment and storage operation. There is no.

Further, as shown in FIG.
The straight line perpendicular to the straight line connecting the intersections 93 and 94 of the tie wire and the surface wire adjacent to the straight line connecting the two end points 91 and 92 is attached so as to be inclined at an inclination angle in the direction shown by arrow C in FIG. End point 9
The line segment connecting the first and second points 92, the end point 92, and the end point 1 of the support column 13
21 are end points 91 and 92 of the tie wire 42.
And the straight line orthogonal to the straight line connecting the intersections 93 and 94 of the tie wire and the surface wire adjacent to the tie wire and the surface wire is longer than the case where the straight line is parallel to each other. As shown in FIG. In this state, the support pillar 13 joined to the outer vertical member 23 becomes vertical, and even if the surface wire 40 is pulled upward in FIG. 5, the tension of the surface wire 40 increases, and the wire is damaged, It does not hinder the deployment and storage operation.

Next, a second embodiment of the present invention will be described. In the following description, the same components as those in the above-described embodiment will be denoted by the same reference numerals, and redundant description will be omitted.

FIG. 7 shows the four-sided links 21 constituting the deployed truss 20.

In this embodiment, as in the first embodiment, there is no support pillar 13 at the center of the module 23, and the support pillar 13 exists only at the tip of the four-sided link 21 extending radially from the central vertical member 22. I do.

The second embodiment differs from the above-described embodiment in the method of joining the tie wire 42 to the horizontal member 52 and the angle formed by the tie wire with the surface wire 40.

In the second embodiment, the tie wire 42 supporting the surface wire 40 is attached to the attachment portion 131 via the slide ring 130, and the attachment portion is joined to the horizontal member 52. The slide ring 130 is slidably engaged with the asymmetric mountain-shaped rail portion 132 of the attachment portion 131.

In the second embodiment, a straight line connecting the end points 91 and 92 of the tie wire 42 and a straight line orthogonal to a straight line connecting the intersections 93 and 94 of the adjacent tie wire and surface wire are parallel. Is composed,
As shown in FIG. 7, when the tie wire 42 is unfolded, tension is applied to the tie wire 42. Therefore, the slide ring 130 to which the tie wire 42 is attached is pulled into the apex of the asymmetrical mountain-shaped rail portion 132 and is stable.

In the state where the four-sided link 21 is stored as shown in FIG. 5, the support pillar 13 joined to the outer vertical member 23 becomes vertical, and even if the surface wire 40 is pulled upward in FIG. The tie wire 42 is connected to the slide ring 13.
0, since it is joined to the horizontal member 52 via the rail portion 132 of the attachment portion 131, the slide ring 130 to which the tie wire 42 is attached moves rightward in FIG. Rail part 1 of shape
Move from the 32 vertex position. Thereby, the tension of the surface wire 40 is increased, and the wire is damaged,
It does not hinder the deployment and storage operation.

Next, a third embodiment of the present invention will be described. In the following description, the same components as those in the above-described embodiment will be denoted by the same reference numerals, and redundant description will be omitted.

FIG. 8 shows an example of an antenna reflector using a deployment truss with radial ribs similar to FIG.

Also in the third embodiment, similarly to the above embodiment, there is no support column 13 at the center of the module 23, and the tip of the four-sided link 21 radially extending from the central vertical member 22 is provided. Only the support pillar 13 exists.

The third embodiment is different from the above-described embodiments in that the tie wire 42 is attached.

That is, the tie wire 42 that supports the surface wire 40 is joined to the support wire 41 that connects the horizontal members 52 in an annular shape.

The antenna reflector of this embodiment is moved by the four-sided link 2 as shown in FIG.
When 1 is folded, the distance between the horizontal members 52 constituting the adjacent four-sided links 21 becomes shorter, so that the support wire 41 can be slackened. Therefore, if the tie wire 42 is joined to the support wire 41, the tie wire 4
2, the surface wire 40 attached to the tie wire 42 can also freely restrain the attachment point, and the surface wire 4 can be freely restrained.
The tension of 0 is increased, so that the wire is not broken and does not hinder the deploying and storing operation.

Next, a fourth embodiment of the present invention will be described. As shown in FIG. 13, the structure of the deployment structure 200 according to the fourth embodiment is formed in a substantially hexagonal prism shape. That is, the support structure 201 is a rib-type structure in which support members (hereinafter, referred to as lateral members 202) are arranged in six radial directions from the center, and the reflecting mirror surface is a polygon set on the reflecting mirror surface side called a surface wire 203. Body, here 3
A net-like wire net formed as an aggregate of the square shape 204 and the octagonal shape 205 at the outer periphery, a mesh portion (not shown) using a radio wave reflective material, and a support structure for supporting the reflecting mirror surface shape. It comprises a support wire 206 stretched between members, and a tie wire 207 connecting the surface wire 203 and the support wire 206.

The support wires 206 are disposed between the horizontal members 202 as in the embodiment, so that the horizontal members 20 are provided.
2 and the connection point of the support wire 206 existing between the support structure 201 and the support structure 201 can be connected in the shortest distance.
It is possible to minimize the movable range of the wire even when the wires 03, 206, and 207 are slackened.
Is difficult to get entangled. Also, since a large number of portions can be directly connected to the support structure 201, the connection distance between the reflecting mirror surface connection point and the support structure can be made relatively short, so that when the structure is deformed, deterioration of the shape accuracy due to loosening of the wire is suppressed. Becomes possible.

The surface wire 203 is configured to cover the metal mesh from the reflecting mirror side, and
The tie wire 207 is connected from the side.
By adjusting the length of the mirror, a reflecting mirror surface is formed. And
The connection with the support structure 201 is made by the support pillar 2 arranged on the outer peripheral portion.
08 to the surface wire 203 and the support wire 207
Are connected, and a member connecting tie wire 209 is connected to a connecting portion arranged in a rib shape.

Further, the wire connecting portion 210 at the central portion of the reflecting mirror surface and the support wire 211 connected to the mirror-like lateral member in the radial direction are connected with the tie wire 212 at the central portion of the mirror surface. Support wire 206 connected to cross member 202
Since the connection point moves to the upper part in the drawing together with the storing operation of the support structure 201, it is possible to reduce the tension of the wire during the storing operation which is a problem in the supporting structure using the shearing deformation.

Since the tie wire 209 directly connected to the horizontal member 202 is arranged at a certain inclination angle with the horizontal member 202, for example, the sum of the lengths a and b in the figure is c and d.
By determining the connection point 213 so as to be longer than the sum of the above, the wire tension can be reduced during storage.

Further, if a position is set such that the sum of a and b is equal to the sum of c and d, it is possible to maintain a certain tension state from storage to deployment and to prevent wire entanglement. Become.

The surface wire 214 disposed on the outermost periphery
It is self-evident that if the wire is formed only in the circumferential direction without providing a wire connecting from the radial direction, it is obvious that the inward penetration of the outermost peripheral edge is reduced. Since the reflecting mirror surface is divided by the wire 214 disposed between the horizontal members 202 and the wire on the horizontal member 202, the pillow deformation peculiar to the mesh increases, and there is a limit in improving the mirror surface shape accuracy.

In this embodiment, in order to improve the shape accuracy, a triangular sectioned portion 204 is formed inside the reflecting mirror surface, and the outermost wire is constituted only by the circumferential direction wire, and the outer peripheral portion is formed in an octagonal shape. A shape separation portion 205 is provided. According to this configuration, it is possible to reduce the amount of deformation of the reflecting mirror surface at the outer peripheral portion and to increase a surface effective for radio wave reflection.

As described above, the deployable truss structure has a four-sided structure, a four-sided truss structure including diagonal members 61 and 63 having a bent portion in the middle between the diagonal lines, and two slides as the deployment drive mechanism. The moving members 70 and 76 and the oblique member 61,
A link member to which the coupling member 63 is connected and a compression spring 80 provided between the sliding members 70 and 76 are provided, and the four-sided truss structure is deployed and stored by this deployment drive mechanism.

According to this structure, the overall size is compact in the housed state, the weight of the spring is small, the structure can be easily held under gravity, and the strength of the link member on which the pulling force by the compression spring 80 acts. And can be formed in a substantially polygonal prism shape or a substantially polygonal pyramid shape having a light weight, which is suitable for forming various structures to be constructed in outer space.

Further, a combination structure can be formed by combining a plurality of the truss structures having a substantially polygonal column shape or a substantially polygonal pyramid shape.

Further, a supporting column 13 for supporting the wire network 12 was erected on the deployed truss structure, and a mesh for reflecting radio waves was provided on the supporting column 13 to form a reflecting mirror surface to form an antenna reflecting mirror. . According to this,
It is possible to easily configure a large and lightweight reflecting mirror surface, which contributes to promoting the enlargement of an antenna reflecting mirror constructed in outer space.

In the above-described embodiment, the case where the substantially hexagonal column-shaped deployed truss structure is constituted by a combination of four side links in the radial direction has been described. However, the present invention is not limited to this. It is also possible to constitute so as to combine and combine into a substantially polygonal prism shape or a substantially polygonal pyramid shape.

Further, in the above embodiment, the case where the present invention is applied to an antenna reflecting mirror has been described. However, the present invention is not limited to this, and it is also applicable to various structures such as platforms constructed in outer space.

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

[0118]

As described above in detail, according to the present invention, it is possible to provide a deployable truss structure and an antenna reflecting mirror capable of improving the storability, weight reduction, and deployment reliability.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an antenna reflector using a deployed truss structure according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the unfolded truss structure of FIG.

FIG. 3 is a perspective view showing an antenna reflector formed by combining 14 modules of FIG. 1;

FIG. 4 is a plan view showing a four-sided truss structure constituting the deployed truss structure of FIG. 1;

5 is a plan view showing a state in which the expanded truss structure of FIG. 1 is stored and the four-sided truss structure is folded.

FIG. 6 is a perspective view showing an antenna reflector configured by combining a reflector portion with the deployed truss structure of FIG. 1;

FIG. 7 is a plan view showing four-side links constituting a deployed truss structure according to a second embodiment of the present invention.

FIG. 8 is a perspective view showing an antenna reflector using a deployment truss structure according to a third embodiment of the present invention.

FIG. 9 is a perspective view showing a conventional antenna reflector using a deployment truss structure using radial ribs.

FIG. 10 is a perspective view showing a state where the four-sided links of the conventional deployable truss structure are accommodated along with the deploying and accommodating movement.

FIG. 11 is a perspective view showing a configuration of a conventional truss-type deployed structure.

FIG. 12 is a configuration diagram schematically illustrating a part of a conventional umbrella-type deployed structure and a reflecting mirror surface.

FIG. 13 is a perspective view showing a configuration of a deployment truss structure according to a fourth embodiment of the present invention.

[Explanation of symbols]

11 ... mesh. 12 ... Wire. 13 ... Support column. 14 ... Reflecting mirror surface. 20 ... deployment truss. 21a, b, c, d, e, f ... four-sided links. 22 central longitudinal member. 23 ... module. 24a, b, c, d, e, f ... outer vertical members. 25a, b, c, d, e, f ... Module connection hinge. 26a, b, c, d, e, f ... Module connection hinge. 30 ... deployment truss. 31a, b, c, d, e, f ... hexagonal points on the upper surface of the deployment truss. 32a, b, c, d, e, f: points at the tip of the support column 13. 40 ... Surface wire. 41 ... Support wire. 42 ... Tie wire. 43 ... Cross wire. 43 ... Cross wire. 44 ... intersection. 45 ... Wire. 46 ... Tension spring. 52 ... horizontal member. 53 ... horizontal member. 54 Hinge. 55 ... hinge. 56 Hinge. 57 ... hinge. 58 ... shaft part. 59 ... shaft part. 60 ... hinge. 61: Oblique member. 62 ... hinge. 63. Oblique member. 64 Hinge. 70 ... Sliding member. 71 ... hinge. 72 ... hinge. 73 ... Link. 74 ... hinge. 75 ... Link. 76 ... Sliding member. 77 ... hinge. 80 ... compression spring. 81 ... Control wire. 82 ... Control motor. 83 ... Pulley. 90 ... Mounting site. 91 ... End point. 92 ... End point. 93 ... intersection. 94 ... intersection. 95 ... Mounting site. 96 mounting part. 97 mounting part. 100 ... gap. 101 ... shaft part. 110 ... Boom. 120: Midpoint. 130 ... Slide ring. 131: Mounting site. 132 ... Rail section. 200 ... deployment truss structure. 201 ... Support structure. 202 ... horizontal member. 203: Surface wire. 204: Triangular section. 205 octagonal section. 206 ... Support wire. 207 ... Tie wire. 208 ... Support column. 209: Tie wire connecting the horizontal member. 210 central wire connection. 211: Central support wire. 212: Central tie wire. 213 connection point. 214 ... outer peripheral wire. 215: Outer peripheral support wire.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyotaka Uchimaru 1st Kogashi Toshiba-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Toshiba Komukai Plant Co., Ltd. (72) Inventor Kazuyuki Nakamura 1 Komachi Toshiba-cho, Koyuki-ku, Kawasaki City, Kanagawa Prefecture In-house Toshiba Komukai Plant

Claims (13)

[Claims] 1. A quadrilateral structure in which ends of first to fourth quadrilateral members are rotatably connected in a quadrilateral shape, and an intermediate portion is rotatable between one diagonal lines of the quadrilateral structure. A four-sided truss structure having first and second oblique members connected to bend freely; a first sliding member slidably mounted on the first four-sided member of the four-sided truss structure; A first link member rotatably linking an end of the first sliding member to the first and second oblique members; and a first sliding member connected to the first four-sided member of the four-sided truss structure. A second slidably mounted part that does not interfere with the members
A second link member that connects the second slide member and the first link member so that their ends are rotatable; and between the first and second slide members. A deployment truss structure comprising: a spring member provided to apply a sliding force between the first and second sliding members to the first four-sided member. 2. The four-sided truss structure has a storage shape in which first and second four-sided members and third and fourth four-sided members are arranged in a substantially parallel state and opposed to each other. The deployable truss structure according to claim 1, wherein the deployable and retractable movement is possible until the four-sided member reaches a deployed state of a quadrilateral shape. 3. A distance between connecting portions for rotatably connecting the respective ends of the first to fourth four-sided members,
The sum of the joint distance in the first quadrilateral member and the joint distance in the second quadrilateral member is substantially equal to the sum of the joint distance in the third quadrilateral member and the joint distance in the fourth quadrilateral member. The deployment truss structure according to claim 1 or 2, wherein: 4. A connecting portion for rotatably connecting the ends of the first to fourth four-sided members, wherein the connecting portions of the first and third four-sided members are arranged from the center line of each member. The deployable truss structure according to any one of claims 1 to 3, wherein the deployable truss structure is configured so as to protrude in directions opposite to each other. 5. A connecting part for rotatably connecting an end of the third four-sided member and an end of the fourth four-sided member is provided on a center line of the third four-sided member or the first four sides with respect to the center line. The deployable truss structure according to any one of claims 1 to 4, wherein the deployable truss structure is arranged on a side opposite to the member. 6. The deployed truss structure according to claim 1, wherein the first inclined member is shorter than the second inclined member. 7. The deployment truss according to claim 1, wherein a deployment and storage operation is controlled by controlling a position of the first sliding member or the second sliding member. Construction. 8. A motor is installed in the vicinity of a connecting portion that rotatably connects the first four-sided member and an end of the fourth four-sided member, and a pulley and a pulley are coaxially mounted on the motor. The deployed truss structure according to any one of claims 1 to 7, wherein a deployed wire is connected to the first sliding member or the second sliding member to control a deployment and storage operation. 9. A position where the first link member and the second link member are connected to each other at a position where both ends of the first link member are rotatably connected in a housed state of a four-sided truss structure. The deployment truss structure according to any one of claims 1 to 8, wherein the deployment truss structure is arranged on a side opposite to the first four-sided member with respect to a center line to be connected. 10. The deployed truss structure according to claim 1, wherein the number of the second link members is smaller than the number of the first link members. 11. A foldable deployable truss structure in which a plurality of four-sided members are combined in a radial direction to form a substantially polygonal prism or a pyramid, and a foldable deployable truss structure; A wire network configured by joining wires to be shaped into a curved surface and a support column attached to the deployment truss structure and supporting the wire network, wherein the support column has a substantially polygonal pillar shape of the deployment truss structure or the above. An antenna reflecting mirror, which is disposed only at a portion corresponding to a corner point of a substantially polygonal pyramid shape. 12. The mesh structure of the wire network is supported on a mesh surface by a support structure such as a polygonal aggregate, and a polygonal portion supported by an outer peripheral support structure has circumferential and perpendicular directions. 12. The antenna reflecting mirror according to claim 11, wherein the reflecting mirror is constituted by only a wire net, and the other polygonal portions are constituted by radial, circumferential, and perpendicular wire nets. 13. The deploying truss structure, wherein the network wire is attached to the deploying truss structure at a position where the deploying truss structure is adjacent to the deploying truss structure at a location adjacent to the deploying truss structure. 1
13. The antenna reflector according to 1 or 12.