JPH0441787A - Hybrid wire - Google Patents

Abstract

PURPOSE:To obtain a light-weight hybrid wire having small stress distribution in unfolding, not being subjected to restriction in selecting wire material by providing wire with a protective cover by uniformly winding with a yarn having excellent space environment resistance without gap. CONSTITUTION:Wire 1 comprising aramid fiber is wound with a yarn made of polyethylene uniformly without gap and provided with a protective cover 2, or the wire 1 is coiled with a knitted belt 3 knitted with polyester yarn uniformly without gap and equipped with a protective cover 4 to give the objective hybrid wire w1 or w2.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to braided, lobe-shaped or bundled wires (hereinafter collectively referred to as wires in this invention) used as tension members in structures such as artificial satellites. This invention relates to a hybrid wire provided with a protective cover.

(Prior Art) This type of conventional hybrid wire W. For example, as shown in FIG. 3, a lobe-shaped wire 11 made of twisted fibers
There is one provided with a Teflon coating layer 12.

This wire W. In this case, the coating layer 12 is attached to the wire 1
Since the wire 11 is restrained, it is possible to prevent the wire 11 from coming apart during storage. In addition, since the friction between the coating layer 12 or the wire 11 is reduced, the wire 1
1 can be prevented from getting caught.

[Invention or problem to be solved]

However, the conventional hybrid wire Wo has the following problems.

(1) Since the coating layer 12 is thin, the wire 11 is likely to deteriorate when exposed to cosmic rays such as ultraviolet rays in the space environment.

Therefore, it is necessary to use a material for the wire 11 that is not susceptible to the effects of cosmic rays, and the selection of the material is subject to certain restrictions.

(2) Teflon penetrates between the strands of the wire 11 in various ways, causing large variations in the amount of coating, and the wire W is stiff due to large tolerances in weight. This was an obstacle to reducing weight.

(3) As mentioned above, the amount of Teflon coating varies widely, and the tension of the wire 11 due to Teflon differs partially, so the wire W.

There is large variation in stress distribution during deployment.

This invention was made to solve such conventional problems, and is not limited to the selection of wire materials.
It is an object of the present invention to provide a hybrid wire that is lightweight and has small variations in stress distribution during deployment.

[Means to solve the problem]

The hybrid wire provided by this invention includes a wire that includes:
A protective cover for the fibers is provided by uniformly knitting or wrapping fibers with good space environment resistance without gaps.

(Function) (1) Since the protective cover of 1sli11 is applied to the wire without any gaps, it can effectively prevent deterioration of the wire due to cosmic rays.For this reason, any material can be used for the wire. can be used.

(2) Since the fiber protective cover is applied uniformly without gaps in both the length direction and the circumferential direction of the wire, the weight tolerance of the hybrid wire can be reduced and its weight can be reduced.

(3) Since the protective cover of the lie fiber is uniformly applied by knitting or winding the fibers, there is almost no variation in the tension force of the wire by the cover. Therefore, variations in stress distribution when the hybrid wire is deployed are reduced.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

The hybrid wire W1 shown in FIG. 1 is made by braiding polyethylene fibers in a negative pattern (praved ink) onto a wire 1 made of aramid fibers without gaps.
A protective cover 2 made of the same fiber is provided.

The hybrid wire W2 shown in FIG. 2 is a wire 1 made of aramid fiber, and a protective cover 4 made of the same fiber is provided by uniformly wrapping a braided band 3 made of polyester fiber without any gaps. be.

Next, the operation based on the above configuration will be explained.

(1) Since the protective covers 2.4 of both hybrid wires W, W2 restrain the wires 1, there is no risk that the wires 1 will come apart when stored, as in the conventional case. Furthermore, since polyethylene and polyester fibers with low friction are used for the protective cover 2.4, there is no risk of the wire 1 getting tangled during deployment, as in the conventional case.

(2) The polyethylene and polyester i*m that make up the protective covers 2 and 4 have excellent space environment resistance, and since these fibers are wrapped around the wire 1 without any gaps, Deterioration of the wire 1 due to the wire can be effectively prevented. Therefore, there are no restrictions on the type of material used for the wire 1.

(3) Since the fiber protective cover 2.4 is applied uniformly in the length direction and circumferential direction of the wire 1 without any gaps, it reduces the tolerance of the weight of the hybrid wires W, W2 and makes them lightweight. make it possible to

(4) Since the protective cover 2.4LL of IA fiber and 9 braided windings of M fiber are applied in a different manner, the tension force of the wire 1 by the cover is uniformly distributed and does not vary. . For this reason, the hybret wires W, , W2
The variation in stress distribution during the development of the material is reduced.

(5) In the case of the hybrid wire W2 shown in Fig. 2, the structure is such that the braided band 3 is spirally wound.
This has the advantage that the suppleness of the wire 1 is less likely to be affected.

(6) Since the wire 1 receives a load other than a tensile load at its holding portion, it is likely to break at this portion. However, the protective cover 2.4 functions as a cushioning material and reduces the load on the wire 1 in the holding section.

In the case of the hybrid wire WI shown in FIG. 1, when knitting polyethylene fibers to the wire 1,
Aramid fibers may also be incorporated. In this way, it becomes possible to apply a tensile force to the wire 1 without removing the protective cover 2 at the holding portion of the hybrid wire WI.

〔Effect of the invention〕

As explained above, according to the present invention, the wire is provided with a WA type protective cover with good space environment resistance uniformly without any gaps, so there is no restriction on the selection of the material for the wire, and the weight is reduced. It is possible to obtain a hybrid wire that has small tolerances, is lightweight, and has small variations in stress distribution during deployment.

[Brief explanation of drawings]

1 and 2 are side views showing a hybrid wire according to an embodiment of the present invention with a part of its protective cover removed; FIG. 3 is a side view of a conventional hybrid wire; and FIG. 2 is a diagram corresponding to FIG. W, , W2 is a hybrid wire, 1 is a wire, 2.4
is a protective cover for the MAN. In addition, the boss. In the figure,

Claims (1)

[Claims] A hybrid wire characterized by providing a protective fiber cover by uniformly knitting or wrapping fibers with good space environment resistance around the wire without gaps.