Tension balancer for overhead lines

Abstract

A tension balancer for an overhead line is provided that reduces hysteresis loss in its deflection-load characteristic, thereby increasing the stroke length within a set load range. An outer wire 201 and / or an outer auxiliary washer 102b are provided between the outer tubular member 101 and the first intermediate tubular member 102 to prevent contact between the outer spring washer 102a and the outer tubular member 101. The frictional resistance of the outer wire 201 or the outer auxiliary washer 102b relative to the outer spring washer 102a or the outer tubular member 101 is smaller than the frictional resistance of the outer spring washer 102a relative to the outer tubular member 101.

Description

Technical Field

[0001] The present invention relates to a tension balancer for an overhead wire for applying tension to an overhead wire. Background Art

[0002] Overhead wire tension balancers are known that use coil springs to apply tension to overhead wires of railways, etc. For example, Patent Document 1 discloses an overhead wire tension balancer in which coil springs are interposed between a plurality of coaxially arranged cylindrical members.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2009-296795. Summary of the Invention

[0006] Problems to be solved by the invention

[0007] However, conventional overhead wire tension balancers have presented the following challenges: Hysteresis loss occurs in the deflection-load characteristics of the overhead wire tension balancer during expansion and contraction, primarily due to frictional resistance between the inner circumference of the tension balancer's cylindrical member and the spring washer supporting the coil spring. This hysteresis loss sometimes prevents conventional overhead wire tension balancers from ensuring a stroke length sufficient to accommodate the increased expansion and contraction of the overhead wire within the specified load range.

[0008] In this context, an object of the present invention is to provide a tension balancer for an overhead wire that can adapt to the need for increasing the stroke length within a set load range by reducing the hysteresis loss of the deflection-load characteristic.

[0009] Solutions to Problems

[0010] The present invention is characterized in that a tension balancer for an overhead line comprises: a plurality of coaxially arranged cylindrical members, which include at least an outer first cylindrical member and an inner second cylindrical member coaxially arranged with a gap therebetween in the radial direction; a coil spring that imparts elastic force to the axial movement of the second cylindrical member relative to the first cylindrical member; and a spring washer that supports the coil spring, wherein in the tension balancer for the overhead line, a contact prevention means is provided between the first cylindrical member and the second cylindrical member to prevent the spring washer from contacting the first cylindrical member and / or the second cylindrical member, and the friction resistance of the contact prevention means relative to the spring washer and / or the first cylindrical member and the second cylindrical member is smaller than the friction resistance of the spring washer relative to the first cylindrical member and the second cylindrical member.

[0011] In the tension balancer for overhead lines of the present invention, a contact preventing means is provided between the first barrel component and the second barrel component to prevent the spring washer from contacting the first barrel component and / or the second barrel component. The friction resistance of the contact preventing means relative to the spring washer and / or the first barrel component and the second barrel component is smaller than the friction resistance of the spring washer relative to the first barrel component and the second barrel component, thereby reducing the hysteresis loss of the deflection-load characteristic and increasing the stroke length within the set load range.

[0012] Specifically, the contact-blocking means can be composed of at least three wires or at least one strip (ribbon) spaced apart along the axial direction and circumferential direction of the inner periphery of the first and second tubular components, and a spring washer can be placed inside the wires. In such an overhead line tension balancer, the spring washer contacts the wires or strips, resulting in significantly less frictional resistance than when the spring washer contacts the first or second tubular components, thereby achieving the aforementioned effects of the present invention. Furthermore, when using strips, a wide strip can be used to achieve the aforementioned effects with a single strip.

[0013] In the present invention, applying a surface treatment to reduce the friction coefficient on the wire or strip can further reduce the hysteresis loss of the deflection-load characteristic of the overhead line tension balancer. Examples of surface treatments include DLC coating, hard chrome plating, TiN coating, or polytetrafluoroethylene coating. Furthermore, applying a surface treatment to reduce the friction coefficient on at least the outer periphery of the spring washer reduces the frictional resistance against the wire or strip, further reducing the hysteresis loss of the deflection-load characteristic of the overhead line tension balancer.

[0014] Furthermore, in the present invention, the contact-blocking member can be an auxiliary washer having a larger diameter than the spring washer and having a surface treatment applied to at least its outer periphery to reduce the coefficient of friction. This configuration also achieves the same effects as described above. Furthermore, combining this configuration with the above-described configuration is even more effective.

[0015] In the present invention, a plurality of coil springs can be provided in the axial direction. In this case, an auxiliary washer can be interposed between the coil springs.

[0016] Effects of the Invention

[0017] According to the present invention, there is provided a tension balancer for an overhead wire, which increases the stroke length within a set load range and can adapt to an increase in the expansion and contraction amount of the overhead wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a side sectional view of the overhead wire tension balancer according to the embodiment.

[0019] Figure 2 yes Figure 1 Cross-sectional view along line II-II.

[0020] Figure 3 is Figure 2 The arrow III shows an enlarged view of the portion. DETAILED DESCRIPTION

[0021] (constitute)

[0022] Hereinafter, an example of the basic structure of the overhead wire tension balancer to which the present invention is applied will be described. Figure 1 In FIG. 1 , a tension balancer 100 for an overhead line is shown. Figure 2 The overhead wire tension balancer 100 includes four coaxially arranged cylindrical members: an outer cylindrical member (first cylindrical member) 101, a first intermediate cylindrical member (second cylindrical member) 102, a second intermediate cylindrical member 103, and an inner cylindrical member 104.

[0023] A compressed outer coil spring 105 is housed in the gap between the outer tubular member 101 and the first intermediate tubular member 102. The left end of the outer coil spring 105 contacts an outer auxiliary washer (contact prevention member) 102b, which in turn contacts an outer spring washer 102a welded to the outer circumference of the first intermediate tubular member 102. The outer auxiliary washer 102b has a larger outer diameter than the outer spring washer 102a, and at least its outer circumferential surface has been subjected to a surface treatment to reduce the coefficient of friction. Examples of surface treatments to reduce the coefficient of friction include DLC coating, hard chrome plating, TiN coating, and polytetrafluoroethylene coating.

[0024] Furthermore, an outer spring washer 102 a is welded to the inner surface of the outer cylindrical member 101 at the right end of the outer coil spring 105 , and an outer auxiliary washer 102 b is in contact with the outer spring washer 102 a .

[0025] On the inner circumferential surface of the outer tube member 101, a plurality of (in this embodiment, three) outer wires (contact prevention members) 201 are arranged at equal intervals in the circumferential direction. The outer wires 201 are composed of, for example, a steel wire with high hardness such as piano wire or a copper wire with good sliding properties, and are fixed to the inner circumference of the outer tube member 101 by, for example, welding or bonding. In addition, the outer circumferential surface of the outer wire 201 is subjected to a surface treatment to reduce the friction coefficient. Examples of surface treatments to reduce the friction coefficient include DLC coating, hard chrome plating, TiN coating, or polytetrafluoroethylene coating. In addition, a strip or a plurality of outer wires 201 may be arranged on the outer circumferential surface of the first intermediate tube member 102.

[0026] In the gap between the first intermediate cylinder member 102 and the second intermediate cylinder member 103, an intermediate coil spring 106 is accommodated in a compressed state. Figure 1 In the state shown in FIG, the left end of the intermediate coil spring 106 is in contact with the intermediate auxiliary washer (contact preventing member) 103b, and the intermediate auxiliary washer 103b is in contact with the intermediate spring washer 103a welded to the outer circumference of the second intermediate cylinder member 103. The intermediate auxiliary washer 103b has an outer diameter larger than that of the intermediate spring washer 103a, and at least its outer circumferential surface is subjected to the same surface treatment as described above to reduce the friction coefficient.

[0027] Furthermore, an intermediate spring washer 103a is welded to the inner peripheral surface of the first intermediate cylindrical member 102 at the right end of the intermediate coil spring 106, and an intermediate auxiliary washer (contact preventing member) 103b is in contact with the intermediate spring washer 103a.

[0028] On the inner circumference of the first intermediate cylinder member 102, multiple (three in this embodiment) intermediate wires (contact-blocking members) 202 are arranged at equal intervals along the circumferential direction. The intermediate wires 202 are composed, for example, of a high-hardness steel wire like piano wire or a copper wire with excellent sliding properties, and are secured to the inner circumference of the first intermediate cylinder member 102 by welding or adhesive bonding. Furthermore, the outer circumference of the intermediate wires 202 is subjected to a surface treatment similar to that described above to reduce the coefficient of friction. Alternatively, a strip or multiple intermediate wires 202 may be arranged on the outer circumference of the second intermediate cylinder member 103.

[0029] In the gap between the second intermediate cylinder member 103 and the inner cylinder member 104, the inner coil spring 107 is housed in a compressed state. Figure 1 In the state shown in FIG, the left end of the inner coil spring 107 is in contact with the inner auxiliary washer (contact preventing member) 104b, and the inner auxiliary washer 104b is in contact with the inner spring washer 104a welded to the outer circumference of the inner cylindrical member 104. The inner auxiliary washer 104b has an outer diameter larger than that of the inner spring washer 104a, and at least the outer circumferential surface thereof is subjected to the same surface treatment as described above to reduce the friction coefficient.

[0030] Furthermore, an inner spring washer 104a is welded to the inner peripheral surface of the second intermediate cylinder member 103 at the right end of the inner coil spring 107, and an inner auxiliary washer (contact preventing member) 104b is in contact with the inner spring washer 104a.

[0031] On the inner circumference of the second intermediate cylindrical member 103, multiple (three in this embodiment) inner wires (contact-blocking members) 203 are arranged at equal intervals along the circumferential direction. The inner wires 203 are composed of, for example, a high-hardness steel wire such as piano wire or a copper wire with good sliding properties, and are secured to the inner circumference of the second intermediate cylindrical member 103 by welding or adhesive bonding. Furthermore, the outer circumference of the inner wires 203 is subjected to a surface treatment similar to that described above to reduce the coefficient of friction. Alternatively, a strip or multiple inner wires 203 may be arranged on the outer circumference of the inner cylindrical member 104.

[0032] Furthermore, grease is applied or filled as a lubricant to the portions of the outer coil spring 105, the middle coil spring 106, and the inner coil spring 107 that contact the tubular member so as not to hinder relative sliding movement therebetween. The lubricant is not limited to grease as long as it has a lubricating function.

[0033] exist Figure 1 An overhead wire mounting member 108 is fixed to the right end surface of the inner cylindrical member 104. The overhead wire mounting member 108 includes bolts 108a, and an overhead wire (not shown) is mounted to the overhead wire mounting member 108 using these bolts 108a. While railway overhead wires are exemplified as examples of overhead wires, other applications such as power lines, signal transmission lines, and support lines may also be employed.

[0034] The overhead wire tension balancer 100 is supported on a support column (not shown) by a support column mounting member 109. Specifically, a cover 111 is secured to the left end opening of the outer cylinder member 101. This cover 111 closes the opening, preventing the first intermediate cylinder member 102, the second intermediate cylinder member 103, and the inner cylinder member 104 from falling out of the outer cylinder member 101. The support column mounting member 109 is secured to the cover 111 by welding. The cover 111 is securely supported by a U-shaped rod 110 inserted from above into a mounting hole formed in the outer cylinder member 101, preventing it from falling out of the outer cylinder member 101. Bolts 109a are attached to the support column mounting member 109, securing the overhead wire tension balancer 100 to the support column. Reference numeral 112 in the figure denotes a reinforcement member welded to the outer cylinder member 101.

[0035] (Function of overhead line tension balancer)

[0036] exist Figure 1 The overhead wire mounting member 108 of the overhead wire tension balancer 100 shown in FIG is mounted with an overhead wire. In this state, the overhead wire mounting member 108 is relatively pulled to the right in the figure due to the weight of the overhead wire and the force pulling the overhead wire to the right in the figure.

[0037] On the other hand, the outer coil spring 105, the middle coil spring 106, and the inner coil spring 107 are in a compressed state. Therefore, in order to pull the inner tube member 104, the second middle tube member 103, and the first middle tube member 102 to the right in the figure, a force is required to overcome the elastic force of the outer coil spring 105, the middle coil spring 106, and the inner coil spring 107. The reaction force of this force becomes the tension acting on the overhead wire mounted on the overhead wire mounting member 108, that is, the tension that pulls the overhead wire to the left in the figure. Figure 1 The tension of the overhead wire (not shown) stretched to the right of the figure acts on the wire. For example, if the overhead wire expands or contracts or moves up and down, the overhead wire mounting member 108 moves left or right in the figure, but this is absorbed by the expansion and contraction of the outer coil spring 105, the middle coil spring 106, and the inner coil spring 107.

[0038] If the overhead wire mounting member 108 moves left or right in the diagram, the inner cylindrical member 104, the second intermediate cylindrical member 103, and the first intermediate cylindrical member 102 also move left or right in the diagram. At this point, the inner cylindrical member 104, the second intermediate cylindrical member 103, and the first intermediate cylindrical member 102 are not fixed to each other but supported by coil springs. Therefore, they tilt slightly due to their own weight, causing them to vibrate in a direction perpendicular to the axial direction. Conventionally, this caused the spring washer to contact the inner circumference of the cylindrical member, resulting in significant hysteresis loss in the deflection-load characteristic.

[0039] In the overhead wire tension balancer 100 configured as described above, when the inner cylindrical member 104, the second intermediate cylindrical member 103, and the first intermediate cylindrical member 102 vibrate in a direction perpendicular to the axial direction, the inner auxiliary washer 104b contacts the inner wire 203, the intermediate auxiliary washer 103b contacts the intermediate wire 202, and the outer auxiliary washer 102b contacts the outer wire 201. In this case, the frictional resistance during these contacts is lower than the frictional resistance when the spring washers 102a, etc., contact the outer cylindrical member 101, etc., thereby reducing the hysteresis loss in the deflection-load characteristics of the overhead wire tension balancer 100 and enabling a longer stroke length within a set load range.

[0040] In particular, in the above embodiment, in addition to the outer wires 201, ..., the outer auxiliary washers 102b, ... are also provided, so that the contact between the components reduces the friction resistance, and the hysteresis loss of the deflection-load characteristic of the overhead wire tension balancer 100 is greatly reduced.

[0041] (Change Example)

[0042] The present invention is not limited to the above-described embodiment, and various modifications can be made.

[0043] For example, in the above embodiment, in addition to the outer wires 201, the outer auxiliary washers 102b are also provided. However, even if only one is provided, equivalent functions and effects can be achieved. In the absence of the outer wires 201, the outer auxiliary washers 102b are in contact with the outer tubular member 101. In this case, the outer tubular member 101 can be subjected to a surface treatment to reduce the coefficient of friction, such as hot-dip aluminum plating. Furthermore, multiple outer coil springs 105 can be provided in the axial direction, with the outer auxiliary washers 102b positioned between the outer coil springs 105. Furthermore, as a contact prevention measure, it is also possible to omit the outer wires 201 or the outer auxiliary washers 102b and apply a surface treatment to reduce the coefficient of friction only to the inner circumferential surface of the outer spring washers 102a and / or the outer tubular member 101. Such surface treatment also constitutes a contact prevention measure of the present invention.

[0044] The outer wires 201, ... are not limited to being arranged in a configuration of three in the circumferential direction; any number of them may be four, five, or more. Furthermore, the outer wires 201, ... are not limited to being arranged at equal intervals in the circumferential direction; they may also be closely arranged in locations where a large load is applied (e.g., the lower side).

[0045] The outer wire members 201, etc. are made of rods, but can also be made of strips. When using strips, by placing wide strips in areas where a large load is applied (e.g., the lower side), a single strip can fulfill the aforementioned function. Alternatively, the strips can be bent to fit the cylindrical shape of the inner circumference of the outer tube member 101. Furthermore, the outer auxiliary washers 102b, etc. are not limited to metal washers; they can also be washers made of a hard plastic such as polyimide resin.

[0046] Industrial applicability

[0047] The present invention can be used in a tension balancer for an overhead line.

[0048] Explanation of symbols

[0049] 100 ... overhead line tension balancer, 101 ... outer cylinder member (first cylinder member), 102 ... first intermediate cylinder member (second cylinder member), 102a ... outer spring washer, 102b ... outer auxiliary washer (contact prevention member), 103 ... second intermediate cylinder member, 103a ... intermediate spring washer, 103b ... intermediate auxiliary washer (contact prevention member), 104 ... inner cylinder member, 104a ... inner spring washer, 104b ... inner auxiliary washer (Contact-blocking component), 105...outer coil spring, 106...middle coil spring, 107...inner coil spring, 108...overhead line mounting component, 108a...bolt, pillar-side mounting component...109, bolt...109a, 201...outer wire (contact-blocking component), 202...middle wire (contact-blocking component), 203...inner wire (contact-blocking component), 110...U-shaped rod, 111...cover, 112...reinforcement component.

Claims

1. A tension balancer for an overhead line, comprising: a plurality of coaxially arranged cylindrical members, comprising at least an outer first cylindrical member and an inner second cylindrical member coaxially arranged with a gap therebetween in the radial direction; a coil spring that applies elastic force to the second cylindrical member when the second cylindrical member moves in the axial direction relative to the first cylindrical member; and a spring washer supporting the coil spring between one end and the other end of the coil spring, The above-mentioned tension balancer for overhead wires is characterized in that: One of the spring washers is fixed to the outer periphery of the second tubular member at one end of the coil spring, and the other of the spring washers is fixed to the inner periphery of the first tubular member at the other end of the coil spring. A contact preventing means is provided between the first tubular component and the second tubular component to prevent the spring washer from contacting the first tubular component and / or the second tubular component, wherein the frictional resistance of the contact preventing means relative to the spring washer and / or the first tubular component and the second tubular component is smaller than the frictional resistance of the spring washer relative to the first tubular component and the second tubular component. The contact preventing means comprises: at least 3 wires or at least 1 strip, which are arranged separately along the axial direction and the circumferential direction on the inner periphery of the first tube component; and an auxiliary washer, which is arranged between the spring washer and the other end of the coil spring, and has an inner diameter smaller than the inner diameter of the spring washer.

2. A tension balancer for an overhead line, comprising: a plurality of coaxially arranged cylindrical members, comprising at least an outer first cylindrical member and an inner second cylindrical member coaxially arranged with a gap therebetween in the radial direction; a coil spring that applies elastic force to the second cylindrical member when the second cylindrical member moves in the axial direction relative to the first cylindrical member; and a spring washer supporting the coil spring between one end and the other end of the coil spring, The above-mentioned tension balancer for overhead wires is characterized in that: One of the spring washers is fixed to the outer periphery of the second tubular member at one end of the coil spring, and the other of the spring washers is fixed to the inner periphery of the first tubular member at the other end of the coil spring. A contact preventing means is provided between the first tubular component and the second tubular component to prevent the spring washer from contacting the first tubular component and / or the second tubular component, wherein the frictional resistance of the contact preventing means relative to the spring washer and / or the first tubular component and the second tubular component is smaller than the frictional resistance of the spring washer relative to the first tubular component and the second tubular component. The contact preventing means comprises: a first auxiliary washer, which is an auxiliary washer arranged between the spring washer and the coil spring, and the outer diameter of the auxiliary washer arranged at one end of the coil spring is larger than the outer diameter of the spring washer; and a second auxiliary washer, which is arranged at the other end of the coil spring and the inner diameter of the second auxiliary washer is smaller than the inner diameter of the spring washer.

3. The overhead line tension balancer according to claim 1, wherein The wire or strip is subjected to a surface treatment to reduce the friction coefficient.

4. The overhead wire tension balancer according to claim 1 or 2, characterized in that: The spring washer is subjected to surface treatment for reducing the friction coefficient at least on its outer periphery.

5. The overhead line tension balancer according to claim 1 or 2, characterized in that: The auxiliary washer is subjected to a surface treatment for reducing the friction coefficient at least on its outer periphery.

6. The overhead line tension balancer according to claim 1 or 2, characterized in that: A plurality of coil springs are provided in the axial direction, with the auxiliary washer interposed between the coil springs.

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