Page 71 - Wire Rope News & Sling Technology - February 2019
P. 71

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         cle C is outer diameter D2 of wire 2.                also in the case where the pitch multiplying factor of side
           With the configuration where length L1 of smooth surface   strand 3 is smaller than 7.0 times, fatigue resistance is re-
         P is 4.8 to 11.0 times diameter D1 of side element wire 3b of   duced because of increase in number of the intersection of
         side strand 3, and further the pitch multiplying factor of side   element wires per unit length.
         strand 3 is 7.0 to 12.0 times, when wire 1 and the direction   Specifically,  in  the  exemplary  embodiment  illustrated  in
         turning member make contact with each other, the contact   figures 19 and 20, side element wire 3b of side strand 3 in-
         surface between the direction turning member and wire 1   tersects with and is in point contact with side element wire
         and smooth surface P of side element wire 3b of side strand   2c and side element wire 2d disposed at the outermost layer
         3 make surface contact with each other, and, the number of   of core strand 2. When the pitch multiplying factor of side
         point contact spots between element wires per unit area is   strand 3 is smaller than 7.0 times, the number of point con-
         reduced, thus achieving a high element wire density of wire   tact spots between side element wire 3b of side strand 3 and
         1 per unit cross-sectional area. Accordingly, it is possible to   side element wires 2c and 2d of core strand 2 per unit length
         reduce formation of the strand track of the direction turning   of wire 1 in X-axis direction increases. When wire 1 is bent
         member by side  element  wire  3b  of  side  strand  3,  reduce   by the direction turning member, a local force is applied to
         the  groove  movement sound  which is  generated when  the   the point contact spots of the element wires. In view of this,
         direction turning member and wire 1 slide on each other,   when the number of the point contact spots of the element
         and suppress the reduction in fatigue resistance of the wire.  wires is large, the possibility of cutting of side element wire
           When length L1 of smooth surface P is smaller than 4.8   3b of side strand 3 is high, and consequently the fatigue resis-
         times diameter D1 of side element wire 3b, the length of the   tance of wire 1 is reduced. On the other hand, when the pitch
         exposed portion of side element wire 3b on the outer periph-  multiplying factor of side strand 3 is greater than 12.0 times,
         ery of wire 1 is small, and the length of smooth surface P   gaps are easily formed between the element wires of wire 1,
         in the X-axis direction is small, and consequently, the area   and the ease of manufacturing is reduced, and also, the dura-
         of smooth surface P which makes surface contact with the   bility may possibly be reduced. Specifically, in the exemplary
         direction turning member is small. As a result, the above-  embodiment illustrated in figures 19 and 20, when the pitch
         described effect of smooth surface  P cannot be obtained.   multiplying factor of side strand 3 is greater than 12.0 times,
         Conversely, when length L1 of smooth surface P is greater   core strand 2 cannot be tightly attached on side strand 3, and
         than 11.0 times diameter D1 of side element wire 3b, the   gaps are easily formed between side element wire 3b of side
         thickness of side element wire 3b of side strand 3 is small,   strand 3, and side element wires 2c and 2d disposed at the
         and rupture of element wires occurs when a load is exerted   outermost layer of the core strand 2. As a result, the element
         on a thin portion in a radial direction even with the same   wire density of wire 1 per unit cross-sectional area is reduced,
         cross-sectional area, and as a result, the fatigue resistance of   and the ease of manufacturing is reduced, and also, durability
         wire 1 is reduced. In addition, regarding fatigue resistance,   of wire 1 may possibly be reduced. WRN
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