Trolley wire

Abstract

To provide a trolley wire capable of being wound around a drum at a desired inclination angle.SOLUTION: A contact wire 1 suspended on a track by a suspension member 2 has a nominal cross-sectional area of 130mm2 or more and 170mm2 or less, and a pair of suspension grooves 1112 with which the suspension member 2 is engaged and a pair of wear limit grooves 1314 indicating a wear limit position are formed so as to be recessed from the 1a of an outer peripheral surface along a longitudinal direction. The pair of abrasion limit grooves 1314, have groove widths W larger than 0. 5mm and 1. 5mm or less and groove depths D larger than 0. 3mm and 0. 6mm or less, and the center line of the contact wire is inclined in a range of 5 ° or more and 25 ° or less with respect to the axial direction of the body part of the drum to be laterally wound around the drum.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a contact wire suspended on a track of a railway vehicle by a suspension member, and a method for manufacturing the same. [Background technology]

[0002] Conventionally, a trolley wire suspended above a railway vehicle track by a suspension member is subject to mechanical and electrical wear due to the sliding of the railway vehicle's pantograph. Therefore, when the trolley wire reaches a wear limit, it is replaced with a new one. To replace the trolley wire, as described in Patent Document 1, for example, a drum around which the trolley wire is wound is installed on a line-laying vehicle, and the trolley wire is fed out from the drum and suspended from a linear hanger. The trolley wire has a pair of suspension grooves (also called ear grooves) that engage with protrusions on a suspension member attached to the lower end of the hanger. Furthermore, as shown in Figure 3 of Patent Document 1, for example, the trolley wire is wound horizontally so that the centerline of a cross section perpendicular to the longitudinal direction is parallel to the axis of the cylindrical body of the drum.

[0003] On the other hand, Patent Documents 2 and 3 describe trolley wires in which wear limit grooves, which serve as a guide for replacement due to wear, are formed on both sides along the longitudinal direction. Patent Document 2 describes a trolley wire with two wear limit grooves formed on each side, and Patent Document 3 describes a trolley wire with one wear limit groove formed on each side. During trolley wire inspection, the side of the trolley wire is observed visually or with a camera, and if wear has progressed to the part where the wear limit groove was formed, it is determined that the replacement time has arrived. The wear limit groove is located below the central axis of the trolley wire when it is suspended from a hanger. The lower end of the trolley wire when suspended from a hanger is the sliding contact part that comes into sliding contact with the pantograph of the railway vehicle. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2019-89359 [Patent Document 2] Patent Publication No. 2021-59248 [Patent Document 3] Jikko No. 42-8903 Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, horizontal winding has become mainstream in order to extend the life of contact wires. Horizontal winding is a method of winding contact wires so that the centerline of the contact wire is approximately parallel to the drum body, and this winding method tends to cause the contact wire to bend horizontally rather than vertically relative to the pantograph of the railway vehicle. When a contact wire with a wear limit groove is wound around a drum using this horizontal winding method, as described in Patent Documents 2 and 3, the side of the contact wire with the wear limit groove is wound so that it is in contact with the drum, which can affect the uniformity of the winding.

[0006] SUMMARY OF THE INVENTION An object of the present invention is to provide a trolley wire that can be easily wound around a drum at a desired angle. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a contact wire suspended on a track by a suspension member, the contact wire having a nominal cross-sectional area of ​​130 mm 2 Over 170mm 2a pair of suspension grooves with which the suspension members engage, and a wear limit groove indicating a wear limit position, are formed to be recessed from the outer peripheral surface along the longitudinal direction, the pair of wear limit grooves have a groove width of more than 0.5 mm and not more than 1.5 mm, and a groove depth of more than 0.3 mm and not more than 0.6 mm, the outer peripheral surface includes a small arc surface on one side of the pair of suspension grooves and a large arc surface on the other side, and only a pair of the wear limit grooves are formed on the large arc surface, and the trolley wire is wound transversely around the drum with the center line inclined at an angle of 5° to 25° with respect to the axial direction of the barrel portion so that the end of the center line on the small arc surface side in a cross section perpendicular to the longitudinal direction is closer to the outer peripheral side of the barrel portion of the drum than the end of the large arc surface side. Provide contact wire.

[0008] [Effects of the Invention]

[0009] According to the trolley wire of the present invention, the trolley wire can be easily wound around the drum at a desired angle. [Brief explanation of the drawings]

[0010] [Figure 1] 1(a) is an explanatory diagram showing a state in which a trolley wire suspended above a track by a suspension member is viewed from the longitudinal direction of the trolley wire, and FIG. 1(b) is an explanatory diagram showing a state in which a trolley wire suspended above a track by a suspension member is viewed from the side of the trolley wire. [Figure 2] 1(a) is a cross-sectional view showing a cross section of the contact wire perpendicular to the longitudinal direction, and FIG. 1(b) is an enlarged view of part A in FIG. 1(a) showing the periphery of the wear limit groove. [Figure 3] 1(a) to 1(c) are cross-sectional views showing a state in which the trolley wire 1 is in contact with an outer peripheral surface 31a of a cylindrical body portion 31 of a drum 3 that winds the trolley wire 1. FIG. [Figure 4] 1 is a schematic diagram showing an example of the configuration of a trolley wire manufacturing device. FIG. [Figure 5] 10(a) is a diagram showing the end face of the outlet side of the die of the fifth wire drawing machine, and FIG. 10(b) is a cross-sectional view taken along line BB in FIG. [Figure 6]FIG. 10 is an explanatory diagram showing the manufacturing device in the process of performing a wire storage winding process, as viewed from above. [Figure 7] FIG. 10 is an explanatory diagram showing the manufacturing apparatus when a drum winding process is being performed, as viewed from above. DETAILED DESCRIPTION OF THE INVENTION

[0011] [Embodiment Mode] 1(a) and (b) are explanatory diagrams showing a state in which a trolley wire 1 according to an embodiment of the present invention is suspended on a track by a suspension member 2. Fig. 1(a) shows the state of the trolley wire 1 as viewed from the longitudinal direction, and Fig. 1(b) shows the state of the trolley wire 1 as viewed from the side.

[0012] The trolley wire 1 is a deformed round trolley wire that corresponds to the grooved hard-drawn copper trolley wire specified in JRS (Japanese National Railways Standards), JISE2101, and EN50149. The suspension member 2 is attached to the lower end of a linear hanger 20 and grips the trolley wire 1. The suspension member 2 has a pair of ear fittings 21, 22 that clamp the trolley wire 1, connection plates 23, 24 that are attached to the pair of ear fittings 21, 22, respectively, a bolt 25 that passes through the ear fittings 21, 22 and the connection plates 23, 24, and a nut 26 into which the bolt 25 is screwed. The pair of ear fittings 21, 22 are each provided with claws 211, 221 for clamping the trolley wire 1.

[0013] The trolley wire 1 is made of, for example, tough pitch copper, Cu-Sn-In alloy, or Cu-Sn alloy, and has a nominal cross-sectional area of ​​130 mm 2 (130SQ) or more and 170mm 2 (170SQ) or less. A pair of suspension grooves 11, 12 into which the suspension members 2 engage, and a pair of wear limit grooves 13, 14 indicating the wear limit position, are formed in the trolley wire 1 so as to be recessed from the outer peripheral surface 1a along the longitudinal direction of the trolley wire 1. The pair of suspension grooves 11, 12 are formed vertically above the central axis C of the trolley wire 1 when the trolley wire 1 is suspended. The claw portions 211, 221 of the pair of ear fittings 21, 22 engage with the pair of suspension grooves 11, 12, respectively.

[0014] The outer surface 1a of the trolley wire 1 includes a small arc surface 1b that corresponds to one side (upper side) of the pair of suspension grooves 11, 12 when the trolley wire is suspended, and a large arc surface 1c that corresponds to the other side (lower side) of the pair of suspension grooves 11, 12, with the large arc surface 1c being larger than the small arc surface 1b. A pair of wear limit grooves 13, 14 are formed in the large arc surface 1c. The lower end of the trolley wire 1 is a sliding contact portion 15 that comes into sliding contact with the pantograph of the railway vehicle.

[0015] The wear limit grooves 13, 14 are linear grooves that serve as a guide for replacement due to wear, and are formed at the wear limit position P of the trolley wire 1, shown by the dashed line in Figure 1(a). The vertical distance D1 from the upper end 100 of the trolley wire 1 to the wear limit position P in a suspended state is 7 mm or more and 13 mm or less. In other words, the wear limit position P is a position 7 mm or more and 13 mm or less downward from the upper end 100 of the trolley wire 1 in a suspended state, and when the wear limit grooves 13, 14 disappear, the amount of wear of the trolley wire 1 reaches the wear limit. During inspection of the trolley wire 1, the side of the trolley wire 1 is visually observed by eye or with a camera, etc., to determine whether any of the wear limit grooves 13, 14 on that side has disappeared.

[0016] Fig. 2(a) is a cross-sectional view showing a cross section (cross section perpendicular to the longitudinal direction) of the trolley wire 1. Fig. 2(b) is an enlarged view of part A in Fig. 2(a) showing the periphery of the wear limit groove 13.

[0017] The cross-sectional shape of the contact wire 1 in a cross section perpendicular to the longitudinal direction is symmetrical with the center line L shown by the dashed line in Fig. 2(a) as the axis of symmetry, and a pair of suspension grooves 11, 12 and a pair of wear limit grooves 13, 14 are formed symmetrically on either side of the center line L. The center line L bisects the small arc surface 1b and the large arc surface 1c, and when the contact wire 1 is strung, the center line L extends vertically up and down.

[0018] As shown in FIG. 2(b), the wear limit groove 13 has a groove width W greater than 0.5 mm and not greater than 1.5 mm, and a groove depth D greater than 0.3 mm and not greater than 0.6 mm. In a cross section perpendicular to the longitudinal direction of the trolley wire 1, both end portions 131, 132 of the groove width are chamfered in an arc shape, with chamfer radii R1, R2 of 0.2 mm or more and less than 0.3 mm. In a cross section perpendicular to the longitudinal direction of the trolley wire 1, the wear limit groove 13 has a triangular cross section with linear groove side surfaces 134, 135 between both end portions 131, 132 of the groove width and a groove bottom 133, and the groove bottom 133 has an arc cross section with an arc radius R3 of 0.2 mm or more and less than 0.3 mm. These dimensions are also common to the wear limit groove 14.

[0019] These dimensions of the wear limit grooves 13, 14 have been considered so that even if the end of the groove width of the wear limit grooves 13, 14 (for example, either of the two ends 131, 132 of the wear limit groove 13) comes into contact with the outer peripheral surface of the drum body that winds the trolley wire 1, the angle of the center line L with respect to the axis of the drum is not likely to be affected, and so that the wear limit grooves 13, 14 are easy to see when inspecting the trolley wire 1. In other words, if the groove width W is widened or the chamfer radii R1, R2 are increased, the wear limit grooves 13, 14 become easy to see, but on the other hand, the angle of the center line L of the trolley wire 1 with respect to the drum is more likely to be restricted by the wear limit grooves 13, 14. Also, if the groove depth D is deep, the wear limit grooves 13, 14 become easy to see, but on the other hand, the strength of the trolley wire 1 is more likely to be affected.

[0020] 3(a) to 3(c) are cross-sectional views showing a state in which the trolley wire 1 is in contact with the outer peripheral surface 31a of the cylindrical trunk portion 31 of the drum 3 that winds the trolley wire 1. Fig. 3(a) shows a case in which the inclination angle θ1 of the center line L with respect to the axial direction of the trunk portion 31 is 5°, Fig. 3(b) shows a case in which the inclination angle θ1 of the center line L with respect to the axial direction of the trunk portion 31 is 15°, and Fig. 3(c) shows a case in which the inclination angle θ1 of the center line L with respect to the axial direction of the trunk portion 31 is 25°. To improve ease of stringing work even when the trolley wire 1 is horizontally wound, it is desirable to wind the trolley wire 1 around the drum 3 with the center line L inclined with respect to the axial direction of the trunk portion 31 so that the end of the center line L on the small arc surface 1b side is closer to the outer peripheral surface 31a of the trunk portion 31 than the end of the center line L on the large arc surface 1c side. The desirable range of the inclination angle θ1 is 5° or more and 25° or less (15±10°), as shown in FIGS. 3(a) to 3(c).

[0021] 4 is a schematic diagram showing an example of the configuration of a manufacturing apparatus 4 for the trolley wire 1. The manufacturing apparatus 4 is used to manufacture the trolley wire 1 from the wire rod 10 and wind it around a shipping drum 3, and includes a wire rod payout machine 40 that pays out the wire rod 10 wound in a coil shape, first to fifth wire drawing machines 51 to 55, a wire storage machine 6 that temporarily stores the trolley wire 1 manufactured by the first to fifth wire drawing machines 51 to 55, and a drum winding machine 7 that winds the trolley wire 1 paid out from the wire storage machine 6 onto the drum 3.

[0022] The wire rod payout machine 40 pays out the wire rod 10, which is produced by casting and hot rolling a molten metal of pure copper or a copper alloy, at a constant speed from a rotating coil 41. The first to fifth wire drawing machines 51 to 55 have dies 511, 521, 531, 541, and 551 and capstans 512, 522, 532, 542, and 552, respectively, and the inner diameters of the dies 511, 521, 531, 541, and 551 gradually decrease downstream.

[0023] The wire rod 10 is drawn by passing through the dies 511, 521, 531, 541, and 551 of the first to fifth wire drawing machines 51 to 55 in sequence, gradually reducing its outer diameter and forming a pair of suspension grooves 11 and 12 and a pair of wear limit grooves 13 and 14. The speed at which the wire rod 10 passes through the first to fifth wire drawing machines 51 to 55 gradually increases as the wire rod 10 is drawn. The pair of suspension grooves 11 and 12 are formed as the wire rod 10 passes through the dies 531, 541, and 551 of the third to fifth wire drawing machines 53 to 55. The pair of wear limit grooves 13 and 14 are formed when the wire rod 10 passes through the die 551 of the fifth wire drawing machine 55.

[0024] FIG. 5(a) is a configuration diagram showing the end face on the outlet side of a die 551 of a fifth wire drawing machine 55. FIG. 5(b) is a cross-sectional view taken along line BB in FIG. 5(a). In FIG. 5(a), the up-down direction in the drawing corresponds to the vertical direction. The die 551 has a pair of suspension groove protrusions 551a and 551b for forming the suspension grooves 11 and 12, and a pair of wear limit groove forming protrusions 551c and 551d for forming the wear limit grooves 13 and 14. The die 551 is positioned so that the angle θ2 of the perpendicular bisector L2 of the line segment L1 connecting the pair of wear limit groove forming protrusions 551c and 551d with respect to the horizontal direction is 5° or more and 15° or less (10±5°).

[0025] The wire storage machine 6 has a cylindrical winding body 61, and winds the entire length of the trolley wire 1 produced by the first to fifth wire drawing machines 51 to 55 onto the winding body 61. The drum winding machine 7 winds the trolley wire 1 unwound from the wire storage machine 6 onto the drum 3 after the wire storage machine 6 has wound the terminal end of the trolley wire 1. That is, the manufacturing method of the trolley wire 1 includes a wear limit groove forming process of forming a pair of wear limit grooves 13, 14 in the trolley wire 1 by passing a wire rod through dies 551 having a shape corresponding to the pair of wear limit grooves 13, 14; a wire storage winding process of winding the trolley wire 1, which has passed through the dies 551 of the fifth wire drawing machine 55, which is the final stage of wire drawing, from its starting end to its terminal end, around the outer periphery of the winding body 61 of the wire storage machine 6; and a drum winding process of unwound the trolley wire 1 from the wire storage machine 6 and winding it around the outer periphery of the body 31 of the drum 3.

[0026] Fig. 6 is an explanatory diagram of the manufacturing apparatus 4 when it is performing the wire storage winding process, as seen from above. Fig. 7 is an explanatory diagram of the manufacturing apparatus 4 when it is performing the drum winding process, as seen from above.

[0027] The wire storage machine 6 includes a winding body 61, a rotation drive mechanism 62 that rotates the winding body 61, and a movement mechanism 63 that moves the winding body 61 in the direction of the rotation axis. The winding body 61 rotates about a horizontal rotation axis O1 and winds up the trolley wire 1. The rotation drive mechanism 62 includes a support part 621 that rotatably supports the winding body 61, and a rotation drive part 622 that rotates the winding body 61. The rotation drive part 622 is configured to include, for example, a servo motor and a reducer that are capable of speed control and position control. In Figures 6 and 7, the winding body 61 is shown in cross section along the rotation axis O1.

[0028] The movement mechanism 63 has a slide table 631, a pair of guide rails 632 that guide the slide table 631 parallel to the rotation axis O1, and a movement drive unit 633 that moves the slide table 631 forward and backward. As an example, the movement drive unit 633 moves the slide table 631 forward and backward by rotating a ball screw 633a using a servo motor. A support unit 621 and a rotation drive unit 622 of the rotation drive mechanism 62 are mounted on the slide table 631, and the winding body 61 rotates above the slide table 631.

[0029] In the wire storage and winding process, the winding body 61 is moved in the rotational axis direction along the rotation axis O1 by the moving mechanism 63 while being rotated by the rotation drive mechanism 62. The trolley wire 1 is wound in a single layer around the outer periphery of the winding body 61 so that the trolley wire 1 does not overlap in the radial direction of the winding body 61. More specifically, while the winding body 61 is rotated once by the rotation drive mechanism 62, the slide table 631 is moved by the moving mechanism 63 a distance equal to or greater than the diameter of the trolley wire 1, and the trolley wire 1 is spirally wound horizontally around the winding body 61. The trolley wire 1 is horizontally wound with the center line L inclined with respect to the rotation axis O1 of the winding body 61 so that the end of the center line L on the small arc surface 1b side is closer to the outer periphery of the winding body 61 than the end on the large arc surface 1c side. In this embodiment, the shape of the wear limit grooves 13 and 14 described above makes it less likely that the angle of the center line L of the trolley wire 1 with respect to the winding body 61 will be affected.

[0030] The drum 3 has a body portion 31 and first and second disk-shaped flange plates 32, 33 that protrude radially outward from both ends of the body portion 31. Figures 6 and 7 show the drum 3 in cross section along the rotation axis O2. The rotation axis O2 of the drum 3 is parallel to the rotation axis O1 of the winding body 61 and is horizontal.

[0031] The drum winding machine 7 has a support unit 71 that rotatably supports the drum 3, and a rotation drive unit 72 that rotates the drum 3. The rotation drive unit 72 is configured with, for example, a servo motor and a reducer that are capable of speed control and position control. In the drum winding process, the rotation drive unit 72 rotates the drum 3 around the rotation axis O2, thereby winding the trolley wire 1 wound around the winding body 61 of the wire storage machine 6 onto the drum 3. After the drum winding process is completed, the drum 3 is removed from the drum winding machine 7 and shipped together with the trolley wire 1. The shipped drum 3 and trolley wire 1 are installed on a wire-drawing vehicle, and the trolley wire 1 is pulled out from the drum 3 and attached to the suspension member 2 for stringing.

[0032] If the inclination angle θ1 of the center line L of the trolley wire 1 varies depending on the longitudinal direction of the trolley wire 1, the horizontal winding tendency formed on the trolley wire 1 when wound around the drum 3 will vary depending on the longitudinal direction, and since this tendency is released when the trolley wire is strung, the vertical position of the trolley wire relative to the pantograph of the railway vehicle will tend to vary. In other words, it is desirable that the inclination angle θ1 of the center line L of the trolley wire 1 is not only within the above-mentioned desirable value (15±10°) range, but also that the trolley wire 1 be wound around the drum 3 with uniformity in the longitudinal direction.

[0033] In the drum winding process, the trolley wire 1 is wound in multiple layers around the drum 3 so that the trolley wire 1 overlaps in the radial direction of the trunk portion 31. Figure 7 shows the state in which the ninth layer of the trolley wire 1 is wound around the outer periphery of the trunk portion 31. The first layer of the trolley wire 1 is wound spirally from the first flange plate 32 side to the second flange plate 33 side so as to be in contact with the outer circumferential surface 31a of the trunk portion 31. The second layer of the trolley wire 1 is wound spirally around the outer periphery of the first layer of the trolley wire 1 from the second flange plate 33 side to the first flange plate 32 side.

[0034] In the drum winding process, the winding body 61 is moved in the rotation axis direction along the rotation axis O1 by the moving mechanism 63, while the winding body 61 is rotated by the rotation drive unit 622 and the drum 3 is rotated by the rotation drive unit 72 of the drum winding machine 7. The position of the winding body 61 in the rotation axis direction is adjusted so that the trolley wire 1 between the winding body 61 and the drum 3 is perpendicular to the rotation axis O1 and the rotation axis O2.

[0035] As described above, the die 551 of the fifth wire drawing machine 55 is arranged such that the angle θ2 of the perpendicular bisector L2 of the line segment L1 connecting the pair of wear limit groove forming projections 551c, 551d with respect to the horizontal direction is 10±5°, and the rotation axes O1, O2 of the winding body 61 and the drum 3 are horizontal. Therefore, the die 551 is arranged such that the perpendicular bisector L2 is inclined with respect to the rotation axes O1, O2 in a range of 5° to 15°. On the other hand, as shown in Figures 3(a) to 3(c), the desirable range of the inclination angle θ1 is 15±10°. Therefore, the center value of the angle range of the angle θ2 of the die 551 and the center value of the desirable range of the inclination angle θ1 are shifted by 5°. This is because twisting of the trolley wire 1 from the die 551 until it is wound onto the drum 3 is taken into consideration.

[0036] In other words, due to the difference in volume between the small arc surface 1b side and the large arc surface 1c side in the direction along the center line L, the trolley wire 1 is likely to twist so that the small arc surface 1b side faces upward between the time it is drawn out from the die 551 and the time it is wound onto the drum 3. Therefore, by making the center value of the angle range of the inclination angle θ1 of the center line L of the trolley wire 1 different from the center value of the angle range of the angle θ2 of the die 551, it is possible to wind the trolley wire 1 around the drum 3 at a desired angle.

[0037] More specifically, the wire rod 10 that has passed through the die 551 of the fifth wire drawing machine 55 is first wound around the capstan 552 of the fifth wire drawing machine 55 at an inclined angle corresponding to the angle θ2, and then passes through the winding body 61 of the wire storage machine 6 and is wound around the outer periphery of the body 31 of the drum 3. Therefore, the contact wire 1 is horizontally wound at an appropriate angle with respect to the drum 3, similar to its relationship with the capstan 552 of the fifth wire drawing machine 55. In other words, by arranging the die 551 of the fifth wire drawing machine 55 so that the perpendicular bisector L2 is inclined with respect to the rotation axes O1 and O2, it is possible to easily wind the contact wire 1 around the drum 3 at a desired angle, for example, without having to perform an operation of twisting the contact wire 1 before winding it around the drum 3.

[0038] (Actions and Effects of the Embodiments) According to the embodiment described above, the angle of the center line L in a cross section perpendicular to the longitudinal direction of the trolley wire 1 relative to the rotation axis O2 of the drum 3 is less affected by the wear limit grooves 13, 14, making it easier to wind the trolley wire 1 around the drum 3 at a desired angle. In other words, it is possible to prevent the wear limit grooves 13, 14 from affecting the uniformity of the winding. Here, uniformity of the winding refers to a state in which the variation in the inclination angle θ1 of the center line L in the longitudinal direction of the trolley wire 1 is small and the trolley wire 1 is wound around the drum 3 at a substantially constant inclination angle θ1. In other words, according to the embodiment, it is easier to wind the trolley wire 1 around the drum 3 while maintaining uniformity of the winding.

[0039] (Summary of the embodiment) Next, the technical ideas grasped from the above-described embodiments will be described by using the reference numerals and the like in the embodiments. However, the reference numerals in the following description do not limit the components in the claims to the members and the like specifically shown in the embodiments.

[0040] [1] A contact wire (1) suspended on a track by a suspension member (2), with a nominal cross-sectional area of ​​130 mm 2 Over 170mm 2 a pair of suspension grooves (11, 12) into which a suspension member (2) engages, and a pair of wear limit grooves (13, 14) indicating a wear limit position, are formed to be recessed from an outer peripheral surface (1a) along the longitudinal direction, and the pair of wear limit grooves (13, 14) have a groove width (W) greater than 0.5 mm and not greater than 1.5 mm, and a groove depth (D) greater than 0.3 mm and not greater than 0.6 mm.

[0041] [2] The trolley wire (1) according to the above [1], wherein the pair of wear limit grooves (13, 14) are chamfered in an arc shape at both ends (131, 132) of the groove width (W) in a cross section perpendicular to the longitudinal direction, and the chamfer radius (R1, R2) is 0.2 mm or more and less than 0.3 mm.

[0042] [3] The trolley wire (1) described in [2] above, wherein the pair of wear limit grooves (13, 14) are formed in a straight line between the end portions (131, 132) and the groove bottom (133) in a cross section perpendicular to the longitudinal direction, and the groove bottom (133) has an arc-shaped cross section with an arc radius (R3) of 0.2 mm or more and less than 0.3 mm.

[0043] [4] A trolley wire (1) according to any one of [1] to [3] above, wherein the wear limit position (P) is a position that is 7 mm or more and 13 mm or less downward from the upper end (100) when suspended.

[0044] [5] A method for manufacturing the trolley wire (1) according to any one of [1] to [3] above, wherein an outer peripheral surface (1a) of the trolley wire (1) includes a small arc surface (1b) on one side of the pair of suspension grooves (11, 12) and a large arc surface (1c) on the other side, and the pair of wear limit grooves (13, 14) are formed in the large arc surface (1c), and the method includes a drum winding step of winding the trolley wire (1) around an outer periphery of a drum (3) having a cylindrical trunk portion (31), In the drum winding process, the trolley wire (1) is wound by inclining the center line (L) with respect to the axial direction of the trunk portion (31) so that the end of the center line (L) on the small arc surface (1b) side in a cross section perpendicular to the longitudinal direction of the trolley wire (1) is closer to the outer periphery of the trunk portion (31) than the end on the large arc surface (1c) side, and the inclination angle of the center line (L) with respect to the axial direction of the trunk portion (31) is in the range of 5° to 25°.

[0045] [6] A method for manufacturing a trolley wire (1) according to the above item [5], comprising a wear limit groove forming step of forming the pair of wear limit grooves (13, 14) in the trolley wire (1) by passing the wire (10) through a die (551) having a shape corresponding to the pair of wear limit grooves (13, 14), wherein the die (551) has a pair of protrusions (551c, 551d) for forming the pair of wear limit grooves (13, 14), and is arranged so that a perpendicular bisector (L2) of a line segment (L1) connecting the pair of protrusions (551c, 551d) is inclined at an angle of 5° to 15° with respect to the axial direction of the body portion (31).

[0046] [7] A method for manufacturing the trolley wire (1) described in [6] above, which includes a wire storage winding process between the wear limit groove forming process and the drum winding process, in which the trolley wire (1) that has passed through the die (551) is wound around the outer periphery of the winding body (61) of the wire storage machine (6) from the starting end to the ending end, and in the wire storage winding process, the trolley wire (1) is wound in a single layer so as not to overlap radially around the winding body (61).

[0047] Although the embodiments of the present invention have been described above, the invention according to the claims is not limited to the embodiments described above. It should be noted that not all of the combinations of features described in the embodiments are necessarily essential to the means for solving the problems of the invention. [Explanation of symbols]

[0048] 1...Contact wire 11, 12...Suspension groove 13, 14...Wear limit groove 1a...Outer periphery 131, 132...both ends 133...groove bottom 1a…Outer surface 1b…Small arc surface 1c...Large arc surface 2...Suspension member 3...Drum 31...Body 551... Dice 551c, 551d... Pair of protrusions 6... Wire storage machine 61... Winding body L...Center line L1...Line segment L2…Perpendicular bisector P…Wear limit position

Claims

1. A contact wire suspended on a track by a suspension member, The nominal cross-sectional area of ​​the contact wire is 130 mm ２ More than 170mm ２ is as follows: A pair of suspension grooves that engage with the suspension members and a wear limit groove that indicates a wear limit position are formed to be recessed from the outer circumferential surface along the longitudinal direction, The wear limit groove has a groove width of more than 0.5 mm and not more than 1.5 mm, and a groove depth of more than 0.3 mm and not more than 0.6 mm, the outer peripheral surface includes a small arc surface on one side of the pair of suspension grooves and a large arc surface on the other side, and only one pair of the wear limit grooves are formed on the large arc surface, the trolley wire is wound transversely around the drum with the center line inclined at an angle of 5° to 25° with respect to the axial direction of the body portion so that the end of the center line on the small arc surface side in a cross section perpendicular to the longitudinal direction of the trolley wire is closer to the outer periphery of the body portion of the drum than the end of the large arc surface side. Trolley wire.

2. The wear limit groove is chamfered in an arc shape at both ends of the groove width in a cross section perpendicular to the longitudinal direction, and the chamfer radius is 0.2 mm or more and less than 0.3 mm. The contact wire according to claim 1.

3. The wear limit groove is formed so that a linear shape is formed between the both end portions and the groove bottom portion in a cross section perpendicular to the longitudinal direction, The groove bottom has an arc-shaped cross section with an arc radius of 0.2 mm or more and less than 0.3 mm. The trolley wire according to claim 2.

4. The wear limit position is a position that is 7 mm or more and 13 mm or less downward from the upper end in a suspended state. A trolley wire according to any one of claims 1 to 3.

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