JPH10158984A - Wire rope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire rope having excellent flexibility and high tensile strength. SOLUTION: This wire rope is constituted with a plurality of element wires 1 and produced by double-twisting through the swaging process. The average element wire diameter percentage of a plurality of element wires is <=5% and the swaging process increase the percentage up to 20-35%. The average element wire diameter percentage is represented by (d/D)×100, while wire gap percentage is given by (1-(S/A)×100 where d is the average outer diameter of the wires and D is the outer diameter before the processing such as swaging, S is the sum-up of the cross section area of individual wires and A is the area of the circumcircle of the wire rope after processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a wire rope. More specifically, the present invention relates to a multi-stranded wire rope formed of a plurality of strands and subjected to processing such as swaging.

[0002]

2. Description of the Related Art In a normal driving state, a seat belt of a passenger car is loosely worn by a driver, and a tension is applied such that the driver is bound to the seat in the event of a collision. . As described above, a wire rope is used as a means for operating a seat belt in an emergency, but many of them have insufficient tensile strength even if they have sufficient flexibility. This is because the diameter of the wire is reduced to increase the flexibility.

[0003] However, when the diameter of the wire is reduced, even if the number of wires is increased, the gap between the wires increases and the strength of the wire rope per unit area decreases. As described above, in a multi-stranded rope that requires high strength and high flexibility at a predetermined wire rope outer diameter, usually, either strength or flexibility is sacrificed.

On the other hand, Japanese Patent Publication No. Hei 7-508193 discloses that a wire rope having a 19 × 7 twist configuration is swaged so that the wire gap ratio becomes 22% ( See FIG. 6). However, in this case, since the average wire diameter ratio is about 6.5% and the flexibility is poor, it cannot be used as a wire rope for operating a seat belt.

Further, the above-mentioned publication describes that in a wire rope having a 19 × 19 twist configuration, the wire rope is swaged so as to have a wire gap ratio of 12% (see FIG. 8). However, in this case, since the strand is deformed too much by the swaging, the strength is reduced as compared to before the swaging, and the flexibility is also reduced due to the interference of the strand, so that the seat belt is also operated. It cannot be used for wire ropes.

[0006] Further, the above publication discloses that in a wire rope having a 7 × 7 × 7 twist configuration, a wire gap ratio is 36%.
(See FIG. 7). However, in this case, the wire gap ratio exceeds 35%, and the required strength cannot be satisfied at a predetermined outer diameter of the wire rope, and the wire rope can be used as a wire rope for operating a seat belt. Not something.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a wire rope having excellent flexibility and high tensile strength.

[0008]

A wire rope according to the present invention is a multi-strand wire rope formed of a plurality of strands and subjected to processing such as swaging, and an average strand of the plurality of strands. The diameter ratio is 5% or less, and the wire gap ratio is 20 to 35% by processing such as swaging,
The average wire diameter ratio is represented by (d / D) × 100, the wire gap ratio is represented by (1− (S / A)) × 100, and d is the average outer diameter of the wire. , D is the outer diameter of the wire rope before processing such as swaging, S is the sum of the cross-sectional areas of the individual wires, and A is the area of the circumscribed circle of the wire rope after processing such as swaging. It is characterized by having.

The twist configuration of the wire rope is 19 × 19.
It is preferred that

The twist configuration of the wire rope is 7 × 7 + 6.
It is preferably × 37.

The twist configuration of the wire rope is 7 × 7 × 7.
It is preferred that

[0012] It is preferable that the twist direction of the first layer of the wire rope is the same as the twist direction of the strand of the first layer.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The wire rope of the present invention has a restricted outer diameter and can be used in applications where high strength and flexibility are required. Further, even when the wire rope of the present invention has the same strength and flexibility as the conventional wire rope, the diameter of the wire rope can be reduced by processing such as swaging, so that it is possible to secure space or reduce the size of peripheral parts. Is possible.

The wire rope of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view showing one embodiment of the wire rope of the present invention, FIG. 2 is a sectional view showing another embodiment of the wire rope of the present invention, and FIG. 3 is a wire rope of the present invention. FIG. 4 is a cross-sectional view showing still another example of FIG. 4, and FIG. 4 is a graph showing a relationship between a wire gap ratio (%), a repulsive force (N) and a breaking load (kN) in the wire rope of the present invention. . FIG. 5 is an explanatory diagram showing a method of measuring the repulsive force.

The wire rope 10 of the present invention is a multi-stranded wire rope composed of a plurality of strands 1 and subjected to processing such as swaging. As a material of the strand 1, a hard steel wire rod SWRH62A of JIS G 3506 is suitably adopted. As the twisting method of the element wire, 19 × 19 (see FIG. 1), 7 × 7 + 6 × 37 (see FIG. 2), 7 × 7 × 7
(See FIG. 3).

The average wire diameter ratio (%) is (d / D) × 100
The average wire diameter ratio of the plurality of wires is 5%
It is as follows. Here, d is the average outer diameter of the strand, and D is the outer diameter of the wire rope 10 before processing such as swaging.

The wire gap ratio (%) is expressed as (1- (S / A)) ×
When defined by 100, the wire gap ratio is 20 to 35% due to processing such as swaging. Here, S is the sum of the cross-sectional areas of the individual wires 1, and A is the area of the circumcircle of the wire rope 10 after processing such as swaging.

In the case of the wire rope 10 for operating the seat belt, if the average wire diameter ratio is 5% or more, the flexibility cannot be satisfied. On the other hand, when the wire gap ratio is less than 20%, deformation of the wire during processing such as swaging is too large, the strength is lower than before processing, and the flexibility is also reduced due to interference of the wire. 35%
With the above, sufficient strength cannot be obtained with the predetermined outer diameter of the wire rope.

Embodiment 1 In the case of the wire rope 10 of this embodiment, 19 strands 1
Is composed of a core strand 2 in which S is twisted into an S strand, a first layer 3 formed around the core strand 2, and a second layer 4 formed around the first layer 3 (FIG. 1).

The first layer 3 has six first layer strands 3a twisted around the core strand 2 in an S twist.
The second layer 4 has twelve second layer strands 4a twisted around the first layer 3 in a Z twist. Each of the first-layer strand 3a and the second-layer strand 4a has 19 strands 1 twisted in an S twist.

In the wire rope 10 having a twist configuration of 19 × 19 and an average wire diameter ratio of 4.0%, a swaging process is performed so that the wire gap ratio becomes 22%.
The breaking load (kN) and the repulsive force (N) of the wire rope having an outer diameter of 3.2 mm after the swaging were measured. In the case of this example, both the breaking load and the repulsion were satisfactory (see Table 1).

Example 2 In a wire rope having the same twist structure and the same average wire diameter ratio as that of the first embodiment, the wire rope is swaged so that the wire gap ratio becomes 32%, and the outer diameter after the swaging process is reduced. For a 3.2 mm wire rope, the breaking load (k
N) and repulsion (N) were measured. In the case of this example, both the strength (breaking load) and the flexibility (repulsion) were satisfactory (see Table 1).

Embodiment 3 In the case of the wire rope 10 of this embodiment, a core strand 2 in which seven strands 1 are twisted in a Z twist, and a first layer 3 formed around the core strand 2 are provided. And a second layer 4 formed around the first layer 3 (see FIG. 2).

The first layer 3 has six first layer strands 3a twisted around the core strand 2 in a Z twist.
Six bundles of the second layer strands 4 a constituting the second layer 4 are twisted around the first layer 3 in a Z twist. The first layer strand 3a has seven strands 1 twisted in a Z twist, and the second layer strand 4a has 37 strands 1 twisted in an S twist.

The twist configuration of this embodiment is 7 × 7 + 6 × 37.
In a wire rope having an average wire diameter ratio of 4.6%,
Swaging was performed so that the wire gap ratio became 25%, and the breaking load (kN) and the repulsive force (N) of the wire rope having an outer diameter of 3.2 mm after the swaging were measured. In the case of this example, both the strength (breaking load) and the flexibility (repulsion) were satisfactory (see Table 1).

Embodiment 4 In the case of the wire rope 10 of the present embodiment, a core strand 2 in which seven strands 1 are twisted in a Z twist, and a first layer 3 formed around the core strand 2 are provided. And a second layer 4 formed around the first layer 3 (see FIG. 3).

The first layer 3 has six first layer strands 3a twisted around the core strand 2 in a Z twist.
The second layer 4 has six second-layer strands 4a twisted around the first layer 3 in a Z twist. First layer strand 3
a, seven strands 1 are twisted in an S twist, and a second layer strand 4a is composed of a core strand 4b in which seven strands 1 are twisted in an S strand, and a core strand 4b.
6 side strands 4 twisted in S twist around
and the side strand 4c has seven strands 1 twisted in a Z twist.

In a wire rope having a twist configuration of 7 × 7 × 7 and an average wire diameter ratio of 3.7%, a swaging process is performed so that a wire gap ratio becomes 21%. The breaking load (kN) and the repulsive force (N) of the wire rope having an outer diameter of 3.2 mm after the jing processing were measured. In the case of this example, both the strength (breaking load) and the flexibility (repulsion) were satisfactory (see Table 1).

Comparative Example 1 In a wire rope having the same twist structure and average wire diameter ratio as that of the first embodiment (see FIG. 8), a swaging process was performed so that the wire gap ratio became 12%. The breaking load (kN) and the repulsive force (N) of the wire rope having an outer diameter of 3.2 mm after the swaging were measured. In the case of Comparative Example 1, it was found that the flexibility (repulsive force) was slightly worse and the strength (breaking load) was lower than those of Examples 1 and 2 (see Table 1).

Comparative Example 2 A wire rope having the same twist configuration and average wire diameter ratio as that of Comparative Example 1 was subjected to swaging so that the wire gap ratio became 38%. For the wire rope having an outer diameter of 3.2 mm, the breaking load (kN) and the repulsive force (N) were measured. In the case of Comparative Example 2, the flexibility (repulsive force) was the same as in Examples 1 and 2, but the strength (breaking load) was found to be low (see Table 1).

COMPARATIVE EXAMPLE 3 A wire rope having the same twist structure and the same average wire diameter ratio as that of the fourth embodiment (see FIG. 7) was subjected to swaging so that the wire gap ratio was 36%. The breaking load (kN) and the repulsive force (N) of the wire rope having an outer diameter of 3.2 mm after the swaging were measured. In the case of Comparative Example 3, the flexibility (repulsive force) was the same as in Example 4, but the strength (breaking load) was found to be low (see Table 1).

COMPARATIVE EXAMPLE 4 In the case of the wire rope 10 of the present comparative example, a core strand 2 in which seven strands 1 are twisted in an S twist, and a first layer 3 formed around the core strand 2 And a second layer 4 formed around the first layer 3 (see FIG. 6).

The first layer 3 is formed by twisting six first layer strands 3a around the core strand 2 in an S twist.
The second layer 4 has twelve second layer strands 4a twisted around the first layer 3 in a Z twist. The first strand 3a and the second strand 4a each have seven strands 1 twisted in an S twist.

In the wire rope having a twist configuration of 19 × 7 and an average wire diameter ratio of 6.7%, a swaging process is performed so that the wire gap ratio becomes 23%. The breaking load (kN) and the repulsion (N) of the wire rope having an outer diameter of 3.2 mm were measured. In the case of Comparative Example 4, the strength (breaking load) was about the same as that of Example 2, but it was found that the flexibility (repulsive force) was poor (see Table 1).

Comparative Example 5 In the case of the wire rope 10 of the present comparative example, 19 strands 1
And a first layer 3 formed around the core strand 2 (see FIG. 9).

The first layer 3 is composed of six first-layer strands 3a arranged in a Z twist around the core strand 2.
In the first layer strand 3a, 19 strands 1 are twisted in an S twist.

In a wire rope in which the twist configuration of the wire 1 is 7 × 19 and the average wire diameter ratio is 6.7%, the wire gap ratio is 2
Swaging was performed to 2%, and the breaking load (kN) and repulsion (N) of the wire rope having an outer diameter of 3.2 mm after the swaging were measured.
In the case of Comparative Example 5, the strength (breaking load) was almost the same as that of Example 2, but it was found that the flexibility (repulsive force) was poor (see Table 1).

The repulsive force was measured in Examples 1 to 4 and Comparative Examples 1 to 5 as shown in FIG.

[0040]

[Table 1]

When the relationship between the wire gap ratio and the repulsion force and breaking load was plotted from the wire ropes used in Examples 1 and 2, it was found that the relationship was as shown in FIG.

[0042]

According to the wire rope of the present invention, the outer diameter is restricted, and it can be used in applications where high strength and flexibility are required. Further, even when the wire rope of the present invention has the same strength and flexibility as the conventional wire rope, the diameter of the wire rope can be reduced by processing such as swaging, so that space is secured or the peripheral components are reduced in size. Is possible.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a wire rope of the present invention.

FIG. 2 is a sectional view showing another embodiment of the wire rope of the present invention.

FIG. 3 is a sectional view showing still another embodiment of the wire rope of the present invention.

FIG. 4 is a graph showing a relationship between a wire gap ratio (%), a repulsive force (N), and a breaking load (kN) in the wire rope of the present invention.

FIG. 5 is an explanatory diagram showing a method of measuring a repulsive force.

FIG. 6 is a sectional view showing an example of a conventional wire rope.

FIG. 7 is a sectional view showing an example of a conventional wire rope.

FIG. 8 is a sectional view showing an example of a conventional wire rope.

FIG. 9 is a sectional view showing an example of a conventional wire rope.

[Explanation of symbols]

 1 strand 10 wire rope

Claims (5)

[Claims] 1. A multi-stranded wire rope composed of a plurality of strands and subjected to processing such as swaging, wherein the average strand diameter of the plurality of strands is 5% or less;
20 to 3 wire gap ratio by processing such as swaging
5%, the average wire diameter ratio is represented by (d / D) × 100, and the wire gap ratio is (1- (S / A)) × 100.
Where d is the average outer diameter of the wire, D is the outer diameter of the wire rope before processing such as swaging, S is the total cross-sectional area of each wire, and A is A wire rope having an area of a circumscribed circle of the wire rope after processing such as swaging. 2. The twist configuration of the wire rope is 19 × 1.
9. The wire rope according to claim 1, wherein the number is 9. 3. The twist configuration of the wire rope is 7 × 7 +
The wire rope according to claim 1, wherein the wire rope is 6 x 37. 4. The twist configuration of the wire rope is 7 × 7 ×
7. The wire rope according to claim 1, wherein 5. The wire rope according to claim 1, wherein the twist direction of the first layer of the wire rope is the same as the twist direction of the strand of the first layer.