JP6085139B2 - Wire rope for operation - Google Patents

Description

  The present invention relates to an operation wire rope having a single twist structure such as used for an inner cable of a control cable that is bent and routed and pulled in, for example, an automobile. More specifically, the present invention relates to an operation wire rope having a single-strand structure that has good stroke loss, is easy to bend, and has high durability.

A single-strand structure wire rope is a wire rope in which a core wire composed of a single strand or a strand of strands of a plurality of strands is used as a core material, and a plurality of strands are twisted around it. It is. As a wire rope having such a single twist structure, for example, as shown in FIGS. 5 (a) and 5 (b), generally, strands of almost the same thickness are twisted around the core material. (For example, refer to FIG. 1 of Patent Document 1 and Non-Patent Document 1). That is, the structure shown in FIG. 5A has six strands 72 with a wire diameter d ₃₁ around a core wire 71 with a wire diameter d ₃₀ , and a strand with a wire diameter d ₃₂ around it. 73 12, by being twisted together, respectively, the outer diameter is formed on the D _3, an example of a single-twisted structure of the so-called 1 × 19 1 + 6 + 12. The structure shown in FIG. 5 (b), the periphery of the core wire 75 of the wire diameter d _40, wire diameter present wire 76 d ₄₁ 6, more wire diameter at its periphery of d ₄₂ containing line 77 is twisted 12, further its wire 78 having a diameter around the d ₄₃ is 18 present, by being twisted together, respectively, the outer diameter is formed to _{D 4, 1 + 6 + 12} + 18 called 1 × 37 single of It is an example of a twist structure.

Japanese Patent Laid-Open No. 5-230782

JIS G 3540 "Wire rope for operation"

  In general, the wire rope needs to be flexible and durable. In order to increase this flexibility, it is common to reduce the diameter of the strands and increase the number of strands. However, if the diameter of the wire is reduced, there is a problem that the wear resistance and shape resistance are deteriorated and the durability is lowered.

  On the other hand, in an operation wire rope that is also used for an inner cable of a control cable that is bent and routed, for example, in an automobile, for example, the wiring space is limited. Since the outer diameter cannot be made too large, and the strength that can withstand the operating force is required, the wire diameter cannot be made too small, and 1 as shown in FIG. It is common to use a wire rope having a single twist structure in which the diameter of a strand such as × 19 is made as large as possible and the balance between the diameter of the strand and the number of strands is taken into consideration.

  However, when a 1 × 19 single-strand wire rope is used as an operation wire rope, for example, as an inner cable of a vehicle parking brake control cable, the durability and stroke loss are not sufficient. I found it.

  The present invention has been made to solve such problems, and an object of the present invention is to provide an operation wire rope having improved durability and good stroke loss.

  The wire rope for operation of the present invention includes a core material, a first layer formed by twisting a plurality of strands around the core material, and a plurality of strands parallel to the strands of the first layer. An operation wire rope having a single twist structure having a second layer formed by twisting around the first layer so that one of the first layer and the second layer has an outer diameter. It has a Warrington shape in which a plurality of different strands are alternately arranged, and the shaping rate of the second layer is 60 to 80%.

  Here, the operation wire rope means a wire rope defined in JIS G 3540, which is a relatively thin wire rope mainly used for operation of machinery and equipment, such as machinery, elevators, construction, ships, fisheries, Differentiated from general wire rope (JIS G 3525) used in forestry, mining, cableway, etc. Further, as shown in FIG. 6, the shaping rate is obtained by h / D × 100, where h is the undulation diameter of the second layer when the wire rope is loosened and D is the outer diameter of the wire rope.

  The outer diameter of the strand constituting the other of the first layer or the second layer can be larger than the outer diameter of the strand constituting one of the first layer or the second layer.

  The core material has one core wire and a side wire formed by twisting a plurality of strands around the core wire, and the twisting direction of the first layer is opposite to the twisting direction of the side wire. The second layer may have a Warrington shape.

  According to the operation wire rope of the present invention, since the wire rope has a Warrington-type structure in which the thick wire and the thin wire are alternately arranged in the first layer or the second layer, The gaps between them can be made very small, and the strands can be closely twisted together. As a result, the stroke loss, which is the difference between the operation amount on the operation side and the change amount on the load side, is good and each strand can be made thin, so it is easy to bend and the number of strands within a predetermined outer diameter Therefore, the operating force can be increased, and the wear resistance and durability can be increased. Moreover, since each strand is closely twisted together, it is possible to maintain a high shape resistance. Furthermore, since the shaping rate is 60 to 80%, the tightening force between the wires is moderately strong, the stroke loss is further improved, and the durability is further improved.

It is a section construction figure showing one embodiment of the wire rope for operation of the present invention. It is sectional structure drawing which shows other embodiment of the wire rope for operation of this invention. It is the figure which shows the schematic of the apparatus which measures stroke loss by evaluation of this invention, and the example of a measurement at that time. It is a figure which shows the schematic of the apparatus which measures the frequency | count of durability by evaluation of this invention. (A) And (b) is a cross-section figure which shows the example of the wire rope of the conventional single twist structure. It is explanatory drawing which shows the wave | undulation diameter h and the wire rope outer diameter D which are used when calculating | requiring a shaping rate.

  As described above, for example, an inner wire of a control cable used for a parking brake of an automobile, an operation wire rope that is bent and routed in a vehicle or the like, has a good stroke loss, and is bent. It is required to be easy and durable. Therefore, as a result of intensive studies to obtain an operation wire rope that has such a good stroke loss and is easy to bend, the present inventors have formed an operation wire rope with a single twist structure, and Even in a twisted structure, stroke loss is particularly good, and as a result of intensive studies to obtain an operation wire rope with excellent durability, an operation wire rope with desired characteristics can be obtained by using the twisted structure and shaping rate described later. Found that can be obtained.

  That is, the strand loss structure is a Warrington type structure in which thick wires and thin wires are alternately twisted, and further, the stroke loss is formed by forming the outermost strand to have a shaping rate of 60 to 80%. Has been found to be excellent, and the durability is also improved.

  Here, shaping means that the outermost strand (second layer in the present invention) is plastically deformed in advance in a wound shape so that the twist is not unraveled even if the wire rope is cut halfway. The diameter at the time of shaping is made smaller than the diameter of the wire rope, and the percentage of the diameter of the reduced diameter relative to the diameter of the wire rope is expressed as a shaping rate. Normally, the shaping rate is formed to about 95%, but in the present invention, by making this 60 to 80%, the stroke loss becomes good, and a practical wire rope having a single twist structure is obtained. It was.

  Next, the operation wire rope of the present invention will be described in detail with reference to the accompanying drawings. The operation wire rope 1 of the present invention has a core material 2 and a core material 2 (in the example shown in FIG. The first layer 3 formed by twisting a plurality of strands 31 around the (side wire) 22 structure), and the plurality of strands 41 and 42 around the first layer 3 This is a single twist structure having a second layer 4 formed by being twisted so as to be parallel to the strands of one layer 3. In the example shown in FIG. 1, the second layer 4 is a Warrington type in which a plurality of strands having different outer diameters, that is, strands 41 having a small outer diameter and strands 42 having a large outer diameter are alternately arranged. It has a structure, and the shaping rate of the second layer 4 is 60 to 80%. As will be described later, the first layer 3 may have a Warrington-type structure, and one of the first layer 3 and the second layer 4 alternately includes a plurality of strands having different outer diameters. What is necessary is just to have the Warrington form comprised side by side.

The structure of the operation wire rope 1 of the embodiment shown in FIG. 1 is a so-called 1 × 7 + W (30) structure, and the core material 2 is, for example, around a core wire 21 made of a single wire having a wire diameter d _10. , the lateral line of the wire diameter d ₁₁ (strands 22) is formed by six twisted structure. That is, the core material 2 means a material that becomes the center of the wire rope, and includes a case in which one or a plurality of layers of strands are twisted around the strands in addition to the case of being formed by one strand. Meaning. As described above, the core material 2 may not be a twisted structure but may be formed of a single core wire. However, when the bendability is required depending on the application, a very thick strand is used. Since it becomes difficult to bend, it is preferable to have a structure in which thin strands that can be easily bent are twisted together.

As the material of the wire constituting the core material 2, a material used for a conventional wire rope such as a steel wire or a stainless steel wire can be used. Moreover, the twist direction in the case where the core material 2 is constituted by a plurality of strands can be either Z twist or S twist. However, as will be described later, it is preferable to select the first layer 3 and the second layer 4 wound around the periphery so as to be opposite to the twist direction because the number of rotations can be reduced. On the other hand, when twisting together with the first layer 3 and the like, the twisting directions are matched. The selection of the material of the wire and the twist direction is the same for the first layer 3 and the second layer 4 twisted together, and the diameter of the wire depends on the purpose of use as described above. also, depending on the diameter D ₁ of the circumscribed circle of the required operating wire rope 1 is appropriately selected, for example, in the interior of an automobile, it is routed bent, such as the inner cable of the control cable to be pulled Since the wire rope for operation 1 is required to be easily bent, it should be selected so that the wire diameter is about 0.7 mm or less and can be arranged in the circumscribed circle with as little gap as possible. Is preferred.

In the example shown in FIG. 1, the first layer 3 is formed by twisting 10 strands 31 having a diameter d ₁₂ around the core material 2. Although the twist direction of the strand 31 of the first layer 3 is not limited, as described above, when the core material 2 is composed of a plurality of strands, the strand direction is opposite to the twist direction of the side wire (strand 22). As a result, the rotation direction of the first wire 3 and the rotation direction of the strands 22 of the core material 2 are reversed so that the rotations cancel each other out. And the number of rotations can be reduced. On the other hand, if it is the same direction as the twist direction of the strand 22 of the core material 2, it can be twisted together with the strand 22 of the core material 2 simultaneously. The diameter d ₁₂ of the strand 31 of the first layer 3 is formed by the strand 31 having a diameter larger than the strands 41 and 42 of the second layer 4 described later, that is, larger than the diameter d ₁₄ of the thick strand 42. It is preferable.

The second layer 4, as shown in FIG. 1, a narrow strand 41 with a diameter d _13, around the first layer 3 to alternately thick wire 42 and has one diameter d _14, first layer 3 and a gap of almost no, and is combined second layer wire diameter d ₁₃ and d ₁₄ of Kakumotosen 41 so becomes very small gap between the circumscribed circle of 3 is selected and twisted by ten The so-called Warrington-type structure is formed. The second layer 4 is formed by twisting together with the first layer 3 in the same twisting direction as the first layer 3.

  The outermost layer of the operation wire rope 1, that is, the second layer 4 is shaped in advance. This is formed by plastically deforming the wire constituting the second layer 4 in advance before twisting the second layer 4 together. This is because the strands are elastically deformed by twisting, so if the end of the wire rope is not fixed, for example, when the cut end becomes a free end due to cutting in the middle of the wire rope, etc. This is to prevent the wires from falling apart. The outer diameter of this shaping is usually shaped so as to be as small as about 95% of the outer diameter of the wire rope. As a result of various studies by the present inventors, this shaping ratio was reduced to 60%. It has been found that the stroke loss is improved and the number of times of durability is improved by reducing it to about ˜80%. If the shaping rate is greater than 80%, the stroke loss will not be good and the number of durability will be reduced. If the shaping rate is less than 60%, the wire rope will be easily broken when forming the wire rope, and workability will be remarkably improved. This is because it is worsened and the number of times of durability is greatly reduced. As described above, when the second layer 4 is composed of the thin strands 41 and the thick strands 42, both are shaped in advance at the same shaping rate. In addition, by making the shaping rate 60 to 80%, the stroke loss is improved, the durability is improved, and the number of rotations of the operation wire rope 1 can be reduced. The rotation of the wire rope that is likely to occur in the wire rope can be prevented. Therefore, for example, even when one end side and the other end side of the operation wire rope 1 are routed in an automobile, it can be used without the problem that it becomes difficult to twist and route due to rotation.

FIG. 2 is a view showing a cross-sectional structure of a second embodiment of the wire rope 1 of the present invention. This structure, the first layer 3 becomes Warrington type, which is abbreviated by a so-called Warrington sealed type structure with 1 × WS (31), the core 2, for example from wire of diameter d ₂₀ Around the core wire 23, a side wire (element wire) 24 having a wire diameter d ₂₁ is formed in a twisted structure.

As shown in FIG. 2, the first layer 3 includes a thin strand 33 having a wire diameter d ₂₂ and a thick strand 34 having a wire diameter d ₂₃ alternately arranged around the core material 2, The wire diameters of the strands 33 and 34 are selected so that there is almost no gap between them, and six strands are twisted together to form a so-called Warrington-type structure.

In the example shown in FIG. 2, the second layer 4 is formed by twisting 12 strands 43 having a wire diameter d ₂₄ around the first layer 3. If the twisting direction of the second layer 4 is matched with the twisting direction of the first layer 3, the first layer 3 and the second layer 4 can be twisted together. Moreover, if all the strand directions are matched with the strand 24 of the core material 2, the 1st layer 3, and the 2nd layer 4, all the strands 24, 33, 34, and 43 can be twisted at once. The wire diameter d ₂₄ of the wire 43 of the second layer 4 is preferably formed of a wire 43 having a diameter larger than the wire diameter d ₂₃ of the thick wire 34 of the first layer 3.

  Next, with the above structure, the straw when the shaping rate is variously changed with respect to the wire rope for operation 1 formed by the specific examples of the wire diameter, twist direction, and twist length (twist pitch) of each strand. Crosses, durability times, and rotation times were examined. The results are shown in Table 1. Table 1 also shows some data of a specific example of the conventional structure shown in FIG.

  The stroke loss is measured by fixing the load side end 11 of the operation wire rope 1 to the fixed base 51 of the stroke loss measuring apparatus 5 as shown in FIG. A displacement meter 53 is fixed to one end of the measuring tool 52 and connected to a measuring lever 55 via a load cell 54. A personal computer 57 and an xy recorder 58 are connected to the load cell 54 via an amplifier 56, and the output of the displacement meter 53 is also connected to the amplifier 56. In this configuration, when the measuring lever 55 is operated, the amount of displacement increases in accordance with the load F, and the relationship between the load F and the amount of displacement is obtained by the xy recorder 58. The displacement amount is set such that the distance L1 between the connection portion of the load side end portion 11 in the fixed base 51 and the connection portion of the operation side end portion 12 in the load cell 54 is set to 300 mm. The load-side end 11 of the measurement sample of the operation wire rope 1 manufactured so that the distance between the control-side end 12 and the operation-side end 12 is 300 mm is used as the fixed base 51 and the operation-side end 12 is used as the load cell 54. Using the connected state as a reference, the measurement lever 55 was operated from there, and the displacement when a load of F = 2000 N was applied to the operation wire rope 1 was measured. In addition, the measured value of each Example and a comparative example is a measured value after performing the operation of the above-mentioned measuring lever 55 200 times.

  Further, the durability test was performed using the durability number measuring device 6 shown in FIG. That is, the wire rope 60 to be tested is looped around the outer surface of the cylinder (driving pulley) 63 and the outer surface of the play wheel (driven pulley) 64 via two test pulleys 61 and 62, and the cylinder 63 The wire rope 60 is hung around half of the outer periphery of the wire to fix the wire rope 60 at one point (point B), the weight 65 is connected to the play wheel 64, and the distance on the circumference of the cylinder 63 is 150 mm. The cylinder 63 was driven so that the wire rope 60 reciprocated only, and the number of times until the wire rope 60 was cut was counted. In addition, the counting method is set to once by a movement of the length of 150 mm on the circumference of the cylinder 63 in one direction and once at a length of 150 mm on the circumference of the cylinder 63 in the other direction, that is, in one reciprocation. Counting as 2 times, 1 round trip was made in 1 second. In the apparatus 6 shown in FIG. 4, the test pulleys 61 and 62 are both made of a material having a groove bottom diameter of 48 mm and a hardness of Rockwell C60 or more, and the cylinder 63 has a diameter of 250 mm and a play wheel 64. (W + P) × 9.8 = 441 (N) where W is the weight of the loading device 66 that applies the weight 65 to the playwheel 64 and P is the mass of the weight 65. Further, as shown in FIG. 4, the angles formed by the wire ropes 60 wound around the test pulleys 61 and 62 are each 90 °, and the distance L between the center of the test pulley 61 and the center of the cylinder 63 is 600 mm. Thus, the wire rope 60 between the cylinder 63 and the test pulley 61 and the wire rope 60 between the cylinder 63 and the test pulley 62 are parallel, and the wire rope between the play wheel 64 and the test pulley 61 is parallel. The positions of the cylinder 63 and the test pulleys 61 and 62 are set so that 60 and the wire rope 60 between the play wheel 64 and the test pulley 62 are parallel to each other. The durability test was performed in an environment of 20 degrees. In such an endurance test, the fact that the number of times of endurance until the wire rope 60 breaks also means that there is little fatigue with respect to 90 ° bending, indicating that it is easy to bend. Of course, the durability of the wire rope 60 itself can also be evaluated based on the number of durability times.

  Furthermore, the number of rotations is such that when the operation wire rope 1 has a length of 1 m, one end is fixed, and a weight is applied to the other end so as to apply a load of 270 N, the other end rotates. The number of times was measured (times / m).

[Examples 1 to 3]
In the structure of the operation wire rope 1 shown in FIG. 1 (1 × 7 + W (30)), the wire diameter d ₁₀ of the core wire 21 of the core material 2 is d ₁₀ = 0.46 mm, and the wire diameter d _{11 of the} strand 22 is d ₁₁ = 0.43 mm, the wire diameter d ₁₂ of the wire 31 of the first layer 3 is d ₁₂ = 0.57 mm, the wire diameter d ₁₃ of the thin wire 41 of the second layer 4 is d ₁₃ = 0.36 mm, the diameter d ₁₄ of the thick wires 42 of the second layer 4 and d ₁₄ = 0.49 mm, the twist length of the wire 22 are twisted in 15.7mm of Z twist, the first layer 3 of the wire 31 By twisting together with an S twist of 34.3 mm, and twisting the strands 41 and 42 of the second layer 4 in parallel with the first layer 3 with an S twist of 34.3 mm The operation wire ropes 1 of Examples 1 to 3 having an outer diameter D ₁ = 3.15 mm were produced. In addition, between Examples 1-3, only the shaping rate of the second layer 4 is different, the shaping rate of Example 1 is 60%, the shaping rate of Example 2 is 70%, and Example 3 The shape forming ratio was made 80%.

[Examples 4 to 6]
In Examples 4 to 6, except that the first layer 3 is S-twisted, the wire diameter of each strand, the structure of the operation wire rope 1, the twist length, and the twisting method are the same as those in Example 1, and the outer diameter The operation wire ropes 1 of Examples 4 to 6 with D ₁ = 3.15 mm were produced. The shaping rate of the second layer 4 of Example 4 was 60%, the shaping rate of Example 5 was 70%, and the shaping rate of Example 6 was 80%.

[Examples 7 to 9]
In the structure shown in Figure 2 of the above (1 × WS (31)) , the wire diameter d ₂₀ of the core wire 23 of the core 2 d ₂₀ = 0.45 mm, the wire diameter d ₂₁ of the wire 24 d ₂₁ = 0 .43 mm, the wire diameter d ₂₂ of the thin wire 33 of the first layer 3 is d ₂₂ = 0.35 mm, the wire diameter d ₂₃ of the thick wire 34 of the first layer 3 is d ₂₃ = 0.46 mm, the second layer The wire diameter d ₂₄ of the fourth strand 43 is d ₂₄ = 0.64 mm, the strand length of the strand 24 is 29.5 mm, and the strands 33 and 34 of the first layer 3 and the second layer The four strands 43 were also twisted together with an S twist of 29.5 mm. That is, the wire rope 1 for operation of Examples 7-9 by twisting together the strand 24 of the core material 2, all the strands 24, 33, 34, and 43 of the 1st layer 3 and the 2nd layer 4 in one process. Were prepared. Between Examples 7 to 9, the shaping ratio of the second layer 4 and the outer diameter D ₁ after manufacture are only slightly different. In Example 7, the shaping ratio is 60% and the outer diameter D ₁ is D. ₁ = 3.20 mm, Example 8 has a shaping rate of 70%, outer diameter D ₁ is D ₁ = 3.22 mm, Example 9 has a shaping rate of 80%, and outer diameter D ₁ is D ₁ = 3. It was 22 mm.

[Comparative Examples 1 and 2]
In the structure of 1 × 19 shown in the aforementioned FIG. 5 (a), the wire diameter d ₃₀ of core wire 71 d ₃₀ = 0.65mm, the diameter d ₃₁ of the wire 72 d ₃₁ = 0.60 mm, containing the diameter d ₃₂ of the lines 73 and d ₃₂ = 0.60 mm, twist length of the wire 72 is twisted in the Z twist 20.35Mm, length twisted wires 73 twisting in S twist of 33.6mm In addition, operation wire ropes of Comparative Examples 1 and 2 were produced. The comparative examples 1 and 2 differ only in the shaping ratio of the second layer (the wire 73 in FIG. 5A), the shaping ratio of the comparative example 1 is 60%, and the shaping of the comparative example 2 The rate was 80%, and as a result, the outer diameter D ₃ was D ₃ = 3.01 mm in all cases.

[Comparative Examples 3 and 4]
In the 1 × 37 structure shown in FIG. 5B, the wire diameter d ₄₀ of the core wire 75 is d ₄₀ = 0.48 mm, the wire diameter d _{41 of the} strand 76 is d ₄₁ = 0.45 mm, The wire diameter d ₄₂ of the wire 77 is set to d ₄₂ = 0.45 mm, the wire diameter d _{43 of the} wire 78 is set to d ₄₃ = 0.45 mm, and the strand 76 is twisted with an S twist of 15.2 mm. The strands 77 were twisted together with a Z twist of 25.1 mm, and the strands 78 were twisted together with a Z twist of 35 mm to produce the operation wire ropes of Comparative Examples 3 and 4. Between the comparative examples 3 and 4, only the shaping ratio of the second layer (element wire 78 in FIG. 5B) is different, the shaping ratio of the comparative example 3 is 60%, and the shaping of the comparative example 4 The rate was 80%, and as a result, the outer diameter D ₄ was D ₄ = 3.17 mm in all cases.

[Comparative Examples 5 and 6]
Comparative Examples 5 and 6 were produced under the same conditions as Example 1 except that the shaping rate and the outer diameter were different. The shaping ratio of Comparative Example 5 was 55%, and the outer diameter D ₁ was D ₁ = 3.16 mm. The shaping ratio of Comparative Example 6 was 85%, and the outer diameter D ₁ was D ₁ = 3.16 mm.

[Comparative Examples 7 and 8]
Comparative Examples 7 and 8 were produced under the same conditions as Example 4 except that the shaping rate and the outer diameter were different. The shaping rate of Comparative Example 7 was 55%, and the outer diameter D ₁ was D ₁ = 3.15 mm. The shaping rate of Comparative Example 8 was 85%, and the outer diameter D ₁ was D ₁ = 3.16 mm.

[Comparative Examples 9 and 10]
Comparative Examples 9 and 10 were produced under the same conditions as Example 7 except that the shaping rate and the outer diameter were different. The shaping rate of Comparative Example 9 was 55%, and the outer diameter D ₂ was D ₂ = 3.21 mm. The shaping ratio of Comparative Example 10 was 85%, and the outer diameter D ₂ was D ₂ = 3.21 mm.

  As is clear from Table 1, in the structures of Examples 1 to 9 (1 × 7 + W (30), 1 × WS (31)), a comparison of 1 × 19 and 1 × 37 structures which are the same single-stranded structure. Compared with Examples 1 to 4, in Examples 1 to 9, the stroke loss is in the range of 0.90 to 1.20 mm, whereas in the conventional single twist structure as in Comparative Examples 1 to 4, the shape is Even when the attaching ratio is equal, the stroke loss is in the range of 1.40 to 2.30 mm, indicating that the stroke loss is good. Moreover, even if Examples 1-9 are compared with Comparative Examples 5-10, in Examples 1-9 with a shaping rate of 60-80%, the shaping rates are 55% and Comparative Example 5 with 85%. It can be seen that the stroke loss is better than that of 10. Further, when the shaping rate is 55% or 85%, the stroke loss may be relatively large. Therefore, the stroke loss can be improved to 0.9 to 1.2 mm by twisting so that the shaping rate is 60 to 80%. The performance of the stroke loss is considered to be due to a difference in whether or not it has a Warrington type structure as shown in FIG. 1 or FIG. 2 by comparison with Examples 1 to 9 and Comparative Examples 1 to 4. In other words, it is considered that each strand is closely twisted by having the Warrington-type structure, which contributes to improving the stroke loss. In addition, although Examples 1-3 and Examples 4-6 are the difference in whether the twist direction of the core material 2, and the 1st layer 3 and the 2nd layer 4 is different, it is the difference of this twist direction. The effect on the characteristics due to the difference (whether or not it is from the intersection) does not appear so much.

  Further, as is clear from Table 1, in the structures of Examples 1 to 9 (1 × 7 + W (30), 1 × WS (31)), a comparison of 1 × 19 and 1 × 37 structures, which are the same single-stranded structure. It can be seen that the number of times of durability is remarkably large in all cases as compared with Examples 1 to 4. Therefore, it was found that the operation wire rope of the present invention is very easy to bend and has high durability as compared with the operation wire rope having the conventional single twist structure. Furthermore, Examples 1 to 3 and comparisons with Comparative Examples 5 and 6 having the same conditions as Examples 1 to 3 except for the shaping rate, Examples 4 to 6 and Examples 4 to 6 except for the shaping rate 6 and Comparative Examples 7 and 8 having the same conditions, Examples 7 to 9, and Comparative Examples 9 and 10 having the same conditions as Examples 7 to 9 except for the shaping rate, It can be seen that the durability is greatly improved by setting the application rate to 60 to 80%. Therefore, it is understood that the durability can be further improved by setting the shaping rate to 60 to 80% after making the Warrington type structure. In Example 7, although the number of endurances is slightly decreased, it is still far superior to Comparative Examples 1 to 4. In addition, when the shaping rate exceeds 80%, the number of times of durability is extremely reduced. This is considered to be because the shaping rate is large, that is, if the tightening is loose, rubbing between the strands occurs and the durability is lowered. On the other hand, if the shaping ratio is smaller than 60%, it is considered that the tightening is too strong and the bending property is deteriorated. Furthermore, it is considered that Comparative Examples 1 to 4 do not have a Warrington-type structure as described above, and thus are inferior in adhesion between the strands and rub between the strands. Further, in Comparative Examples 1 and 2, since the number of strands is small, it is considered that each strand is thick and the bendability is reduced. Note that the number of times of endurance becomes smaller when the mass P of the weight 65 is increased in the endurance number measuring device 6 shown in FIG. 4, and the number of times becomes larger when P is decreased. , Relative values measured under the same conditions.

  Moreover, by making the shaping rate of the second layer 4 of the operation wire rope 1 of the present invention 60 to 80%, as can be seen from Table 1, the number of rotations could be greatly improved. In other words, because it is a single-stranded wire rope with a Warrington-type structure, the number of rotations is greatly increased by setting the shaping rate to 60 to 80% in spite of the twisting method that increases the number of rotations by parallel twisting. As shown in Examples 1 to 9, the number of rotations could be suppressed to the range of 0.8 to 1.4. In addition, in Comparative Examples 1-4, although it was the method of twist of the cross twist which mixed Z twist and S twist, even if the shaping rate was 60% or 80%, there were many rotation speeds. This is probably because the strand structure of the wire (Warrington structure) is greatly effective. Further, of the first layer 3 or the second layer 4, the outer diameter of the wire constituting the layer not having the Warrington shape is the element constituting the layer having the Warrington shape. Since it is larger than the outer diameter of the wire, the gap between the strands constituting the first layer 3 and the second layer 4 can be reduced and adhered, and the stroke loss can be further improved. Conceivable.

  As is clear from the above results, according to the wire rope for operation of the present invention, since it has a twisted structure having a Warrington type structure, the strands can be twisted together without gaps, and the shaping rate can be increased. Since it is formed so as to be 60 to 80%, an operation wire rope having a single twist structure excellent in durability and having a single twist structure having a good stroke loss was obtained. In addition, the number of rotations can be kept low, and even when used as an inner cable of a control cable that is bent and routed and pulled, for example, in an automobile, the rotation of the end due to rotation can be suppressed easily. In addition to being able to be routed, it can be used as an operation wire rope that has good stroke loss, is easy to bend, and has excellent durability.

DESCRIPTION OF SYMBOLS 1 Operation wire rope 11 Load side end 12 Operation side end 2 Core material 21 Core wire 22 Wire 3 First layer 31 Wire 33 Thin wire 34 Thick wire 4 Second layer 41 Thin wire 42 Thick wire 43 Wire 5 Stroke Loss Measuring Device 51 Fixing Stand 52 Measuring Tool 53 Displacement Meter 54 Load Cell 55 Measuring Lever 56 Amplifier 57 Personal Computer 58 xy Recorder 6 Durability Number Measuring Device 60 Wire Rope 61, 62 Test Pulley 63 Cylinder (Drive Pulley)
64 Play wheel (driven pulley)
65 Weight 66 Loading device d _{10 to} d ₄₃ Wire diameter B Wire rope fixing point D _{1 to} D ₄ Outer diameter of operation wire rope F Operation load L Distance between center of test pulley 61 and center of cylinder 63 L1 Distance between connection portion of load-side end portion 11 of fixed base 51 and connection portion of operation-side end portion 12 of load cell 54 P Weight of weight W Weight of loading device

Claims (2)

With heartwood,
A first layer formed by twisting a plurality of strands around the core material;
An operation wire rope having a single twist structure having a second layer formed by twisting a plurality of strands around the first layer so as to be parallel to the strands of the first layer,
One of the first layer or the second layer has a Warrington shape configured by alternately arranging a plurality of strands having different outer diameters,
The shaping rate of the second layer is Ri 60-80% der,
The core material has one core wire and a side wire formed by twisting a plurality of strands around the core wire,
The twist direction of the first layer is opposite to the twist direction of the side wires,
An operation wire rope, wherein the second layer has a Warrington shape . The outer diameter of the strand that constitutes the other of the first layer or the second layer is larger than the outer diameter of the strand that constitutes one of the first layer or the second layer. The wire rope for operation according to 1.

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