JPH05179585A - Operation rope - Google Patents

Abstract

PURPOSE:To obtain a rope having improved fatigue life by twisting plural element wires to obtain a strand and twisting a plurality of the strands at a specific tightening ratio. CONSTITUTION:The objective rope 1 is produced by twisting side element wires 6 around a core element wire 5 to obtain a side strand 7 and twisting the side strands 7 around a core strand 4 produced by twisting side element wires 3 around a core element wire 2. The tightening ratio of the rope is adjusted to 2.5-8% to impart sufficiently long fatigue life while relieving the difficulty in twisting and preventing the breakage and damage to element wires caused by overtightening. The rope is suitable as an operation rope subjected to bending under sliding motion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rope for operation (hereinafter, simply referred to as rope). More specifically, the present invention relates to a rope having improved fatigue durability when being bent while sliding.

[0002]

2. Description of the Related Art In general, in order to improve the bending fatigue durability of a rope, the diameter of the wire is reduced, and the decrease in tensile strength is not compensated by increasing the number of wires, but It is designed to reduce the bending stress it receives.

Further, as another means for improving the bending fatigue durability, as disclosed in JP-A-1-104888,
A method is used in which a core material and a plurality of wires twisted around the core material are formed, and the core material is formed into a corrugated or spiral shape before twisting. Then, when a tensile load is applied to the rope, each wire around the core material extends along the pulling direction while narrowing its helical diameter, but the core material also has an extension margin due to the corrugation, and each wire Similarly, it can be extended in the pulling direction by a predetermined amount. As a result, it is possible to prevent a situation in which the wire is broken before the wires around it, like the conventional straight core material.

Conventional ropes have been twisted so that the tightening rate is about 0 to 2% in order to prevent damage during twisting. The tightening rate of the operation rope that is actually on the market was investigated, but it was within this range. That is,
The tightening rate was quite small.

The tightening ratio mentioned here means a value (percentage: percentage) obtained by dividing the value obtained by subtracting the measured outer diameter from the calculated outer diameter by the calculated outer diameter. However, the calculated outer diameter means the total sum of the outer diameters of the respective strands in the diameter direction of the rope, and the actually measured outer diameter means the value obtained by actually measuring the diameter of the circumscribed circle of the rope. For example, in the case of the rope of 7 × 7 structure shown in FIG.

[0006]

[Equation 1]

Can be represented by

In the case of the rope of 19 + 8 × 7 structure shown in FIG.

[0009]

[Equation 2]

Can be represented by

[0011]

However, the conventional rope having a small tightening rate is not fixed like a non-rotating guide.
When the rope is used in a portion that is bent while sliding, the shape is likely to be deformed at the above tightening rate, and the wire is secondarily bent, that is, the wire is pressed against the wire layer below it by external pressure. There is a problem that the bending fatigue durability is low due to the local bending that occurs.

An object of the present invention is to solve the above problems and to provide a rope having improved fatigue durability when flexed while sliding.

[0013]

The operation rope of the present invention is an operation rope composed of a strand obtained by twisting a plurality of strands, and has a tightening rate in the range of 2.5 to 8%. I am trying.

[0014]

The rope of the present invention is twisted harder by increasing the tightening ratio than the conventional rope, and it is possible to prevent the shape from being deformed, and as a result, the secondary bending of the wire is less likely to occur.

Therefore, the rope of the present invention has improved bending fatigue durability in the sliding portion.

[0016]

The rope of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view showing an embodiment of the rope of the present invention, FIG. 2 is an explanatory view of an apparatus for measuring the bending fatigue durability of a rope using rollers, and FIGS. 5 is an explanatory view of a roller used in the apparatus, FIG. 5 is an explanatory view of an apparatus for measuring the bending fatigue durability performance of a rope using a fixed guide when undergoing bending while sliding, and FIGS. 6 to 7 are the apparatus of FIG. It is explanatory drawing of the fixed guide used for.

Some ropes of the present invention have a cross-sectional shape as shown in FIG. 1, but the present invention is not limited to such shapes.

The rope 1 shown in FIG. 1 has a so-called 7 × 7 structure. The 7x7 structure referred to here is one core wire 2
6 side strands 3 are twisted together to form one core strand 4, and one core strand 5 is surrounded by 6
The rope 1 is formed by twisting the side strands 7 formed by twisting six side strands 6 around the core strand 4 and twisting them around each other
It is what

The tightening rate of the rope 1 is 2.5-8%. If the tightening ratio exceeds 8%, it is difficult to twist, and there is a problem that the wire is broken during manufacturing or the surface of the wire is damaged due to excessive tightening. On the other hand, if the tightening rate is less than 2.5%, the durability when sliding and receiving bending is insufficient.

Next, the rope of the present invention will be described in more detail based on specific examples.

Example 1 A steel wire (material: JIS G3506 SWRH62A) is galvanized to have an outer diameter.
I got a bus bar of 1.05mm.

Next, the bus bars are drawn and the outer diameters are
0.185 mm core strand core wire 2, core strand side wire 3, outer diameter 0.185 mm side strand core wire 5 and outer diameter
0.175 mm side strand side strand 6 was manufactured.

These were twisted in the twisting direction shown in Table 1 into the 7 × 7 structure as shown in FIG. 1 to obtain a rope of Example 1 having a measured outer diameter D of the rope of 1.550 mm.

The rope having this tightening ratio can be obtained only by adjusting the pressure and tension applied to the rope in the manufacturing process.

Example 2 A rope of Example 2 was obtained in the same manner as in Example 1 except for the measured outer diameter and tightening rate of the rope shown in Table 1.

Example 3 A rope of Example 3 was obtained in the same manner as in Example 1 except for the measured outer diameter and tightening rate of the rope shown in Table 1.

Example 4 A rope of Example 4 was obtained in the same manner as in Example 1 except for the measured outer diameter and tightening rate of the rope shown in Table 1.

Example 5 A steel wire (material: JIS G3506) was used as the bus bar of the strand for the side strand.
A rope of Example 5 was obtained in the same manner as in Example 1 except that a wire having an outer diameter of 1.05 mm obtained by plating zinc-aluminum alloy on SWRH62A) was used. The zinc-aluminum alloy plating was performed by a hot dip method using a zinc-4% by weight aluminum plating bath.

Comparative Example 1 A rope of Comparative Example 1 was obtained in the same manner as in Example 1 except for the measured outer diameter and tightening rate of the rope shown in Table 1.

Comparative Example 2 A rope of Comparative Example 2 was obtained in the same manner as in Example 5 except for the measured outer diameter and tightening rate of the rope shown in Table 1.

The above Examples 1 to 5 and Comparative Example 1,
2 tightening rate (%)

[0033]

[Equation 3]

It is obtained by the following equation.

[0035]

[Table 1]

Next, bending fatigue endurance tests using rollers and fixed guides of Examples 1 to 5 and Comparative Examples 1 and 2 obtained as described above were carried out.

The respective durability test methods are as follows.

(Durability test method using rollers) As shown in FIG. 2, a 10 kg weight 8 is connected to one end of a rope 1 having a total length of 1,000 mm, and the rope 1 is routed so that the rollers 9 are turned by 90 °. did. The other end of the rope 1 is fixed to the outer circumference of a disk 12 that is linked by a drive unit 10 and a lever 11.

That is, when the drive unit 10 rotates in the arrow E direction, the disk 12 rotates in the arrow F and G directions, and the roller 9 rotates in the arrow H and J directions. The stroke of the rope 1 was 100 mm, the speed was 20 reciprocations / minute, and the contact portion between the rope 1 and the roller 9 was sufficiently coated with olefin grease.

FIG. 3 shows a front view ((A) of FIG. 3) and a side view ((B) of FIG. 3) of the roller 9. The groove bottom diameter of the roller 9 is 27 mm and the material is nylon 6 Is.

FIG. 4 is an enlarged view of the groove portion of the roller 9. The inner radius R1 of the groove bottom cross section is 1.0 mm and the groove angle θ is 40 °.

(Durability test method using fixed guide) FIG.
As shown in, a weight 13 of 10 kg was connected to one end of the rope 1 having a total length of 1,000 mm, and the rope 1 was routed so that the fixed guide 14 was turned over by 90 °. The other end of the rope 1 is fixed to the outer circumference of a disc 17 which is interlocked by a drive unit 15 and a lever 16.

That is, when the drive unit 15 rotates in the direction of arrow L, the disk 17 rotates in the directions of arrow M and N, and the rope 1 slides on the fixed guide 14 in the directions of arrow P and Q. It has become. The rope 1 has a stroke of 100 mm and a speed of 20 reciprocations / minute, and the sliding portion between the rope 1 and the fixed guide 14 is sufficiently coated with olefin grease.

FIG. 6 is a front view of the fixed guide 14 ((A) of FIG. 6).
And the side view ((B) of FIG. 6).
The groove bottom diameter S is 27 mm and the material is nylon 6.

FIG. 7 is an enlarged view of the groove portion of the fixed guide 14,
The inner radius R2 of the groove bottom cross section is 1.0 mm, and the groove angle γ is 40 °.

Table 2 shows the results of the durability test of Examples 1 to 5 and Comparative Examples 1 and 2.

[0047]

[Table 2]

According to the results shown in Table 2, in the durability test using the rollers, the wire breakage was not recognized in Examples 1 to 5 and Comparative Examples 1 and 2 even after the durability count of 20,000 times. However, in the endurance test using the fixed guide, in Comparative Examples 1 and 2, 49 strands were broken at the location where it was bent by the fixed guide after about 10,000 times of durability, and the rope was broken. In Examples 1 to 4, the wire breakage did not occur even after the durability of 20,000 times. It should be noted that once means that the stroke length reciprocates once.

As described above, Examples 1 to 5 and Comparative Examples 1 and 2 only undergo bending, that is, there is no great difference in durability in the durability test with the rollers. However, there is a clear difference in durability when the guide is slid and bent.

Therefore, it can be seen that the rope having a tightening ratio of 2.5 to 8% has excellent bending fatigue durability.

Further, it can be seen that the durability is not affected by plating the strands of the side strands with zinc-aluminum alloy plating, which is a highly corrosion resistant plating, instead of the usual zinc plating.

Although the embodiment of the present application has a 7 × 7 structure, the same rope outer diameter and strand diameter are reduced to 19 + 8.
It goes without saying that the same effect can be obtained in the configuration of x7, 7x19 and the like.

[0053]

The rope of the present invention has a tightening rate of 2.5 to 8%.
Therefore, even if it is used in a sliding portion such as a guide, the bending fatigue durability does not decrease. Therefore,
For example, it can be preferably used for a control cable for a window regulator of an automobile.

[Brief description of drawings]

FIG. 1 is an explanatory view for explaining a tightening rate of a rope and a cross-sectional view showing an embodiment of the rope of the present invention.

FIG. 2 is an explanatory diagram of an apparatus for measuring bending fatigue durability performance of a rope using rollers.

3 is an explanatory diagram of a roller used in the apparatus of FIG.

FIG. 4 is an explanatory diagram of a roller used in the device of FIG.

FIG. 5 is an explanatory view of an apparatus for measuring the bending fatigue endurance performance of a rope when it receives bending while sliding using a fixed guide.

6 is an explanatory view of a fixed guide used in the apparatus of FIG.

7 is an explanatory diagram of a fixed guide used in the device of FIG.

FIG. 8 is an explanatory diagram for explaining a tightening rate of a rope.

[Explanation of symbols]

 1 rope 2 core strand core element wire 3 core strand side element wire 4 core strand 5 side strand core element wire 6 side strand side element wire 7 side strand D Measured outer diameter of rope

Claims (4)

[Claims] 1. An operating rope having a multi-twist structure, which is formed by twisting a plurality of strands obtained by twisting a plurality of strands together, and has a tightening rate of 2.5 to 8%. A rope for operation. 2. The operating rope according to claim 1, wherein the twisted structure is a 7 × 7 structure. 3. The operating rope according to claim 1, wherein a high corrosion resistant steel wire is arranged on the side strand. 4. The operating rope according to claim 1, wherein a zinc-aluminum alloy plated wire is arranged on the side strand.