JPS60240534A - Composite rigid power feed line for electric car and manufacture thereof - Google Patents

Abstract

PURPOSE:To make close the contact between metals of different kinds so that the contact resistance therebetween in a power feed line for electric cars and to enhance the wear-resistant ability of the power feed line to aim at sustaining an electric resistance by press-fitting th head section of a highly conductive metal of extrusion molding in a wear-resistant metal slide member of invert U-like cross-sectioned shape. CONSTITUTION:A wear-resistant metal slide member 3 made of stainless steel, etc., in an inverse U-shape which is identical with the cross-sectioned shape of a carrier head section 2 made of a highly conductive metal such as, for example, aluminum, etc., which is obtained by extrusion molding is formed therein with indentations 4, simultaneously with moulding of the slide section 3. Then both are assembled together, and a roll 5 is laid on the lower surface of the carrier head 2. Further, a die 6 having a width slightly larger than that of the slide member 3 is fitted onto the latter to compress the carrier head section 2 in order to prevent the same from overflowing from the opening part of the slide member 3 until the part having an amount which is obtained by compressing the carrier head section 2 for plastic deformation is filled in the gap (W2-W1) among the indentations 4, the slide member 3 and the head section 2, and the head section 2 has its width W3 larger than the width W2 of the slide member 3 after compression. With this arrangement the fixing force may be made large so that it is possible to prevent rain water from entering in the joint section between metals of different kinds.

Description

DETAILED DESCRIPTION OF THE INVENTION [Description and Objects of the Invention] The present invention relates to a rigid overhead contact line, and particularly to a composite rigid overhead contact line in which sliding members are coated with a wear-resistant metal material.

Composite rigid overhead contact lines have been known for a long time, and an example is disclosed in Japanese Patent Publication No. 57-33177r'.

This conventional composite rigid overhead contact line is made by extruding a highly conductive metal material such as an aluminum alloy, and has parallel grooves that open toward the earth at both ends of the top surface of the trestle, with both edges facing downward. Cover the top surface of the pedestal by placing both edges into the groove on a wear-resistant metal plate material such as stainless steel that has been bent into an inverted U-shaped cross section, and then place it on the outside of the groove of the pedestal. It is constructed by integrating the two by caulking the falling protrusion inward.

In such conventional composite rigid overhead contact lines, the wear-resistant metal members that are the sliding members are only held down by caulking and fixing at the edges of the aluminum pedestal, so both the trestle and the sliding members are affected by temperature changes. Due to the difference in coefficient of linear expansion, misalignment occurs between the joints of dissimilar metals, and gaps are likely to form in the close contact area between the sliding member and the pedestal, increasing electrical contact resistance in this area and preventing intrusion of landscape water, etc. There is a high possibility that corrosion etc. will occur, and in the worst case, it is expected that the sliding member will come off the pedestal during use.

An object of the present invention is to eliminate the drawbacks caused by conventional caulking and fixation at joints between dissimilar metals, and to improve the integrity of the sliding member and the frame. The object of the present invention is to provide a new composite rigid overhead contact wire and a method for manufacturing the same.

[Summary of the Invention] 1 According to the present invention, a wear-resistant metal sliding member having an inverted U-shaped cross section and a highly conductive metal extrusion having a head that conforms to the U-shaped inner surface are assembled, The above object is achieved by press-fitting the extrusion-formed head into the sliding member L through plastic deformation to make the joint tight and to place the joint between dissimilar metals on the inside against rainwater, etc. do.

[Example] FIG. 1 is a sectional view of an example of a composite rigid overhead contact wire according to the present invention before assembly.

In FIG. 1, reference numeral 1 denotes a pedestal made of extruded highly conductive metal such as aluminum, with a head 2 on the right. A wear-resistant metal sliding member 3 made of stainless steel or the like having an inverted U-shape substantially identical to the cross-sectional shape of the head 2 is arranged.

This sliding member 3 can be formed by molding a wear-resistant metal tape by roll forming or press bending, and at the same time, a groove, that is, a depression 4 in cross section, is simultaneously formed on the inner edge of the sliding member 3. By making the inner width of the sliding member 3 a little larger than the width of the head 2, assembly of both sides becomes easier.

In this combined state, as shown in FIG. 2, a roll 5 is placed on the lower surface of the pedestal part 2, and a die 6 having a slightly wider width than the roll 5 is placed on the sliding member 3. The head 2 is compressed so that the mounting portion 2 does not overflow from the opening of the moving member 3, and the inner recess 4 of the sliding member 3 and the gap between the sliding member 3 and the head 2 (W2 - W
In l), the material compressed by the rolls 5 is plastically deformed to fill the material and further deformed until the width W3 after compression becomes larger than the width W2 of the sliding member 3. This further increases the adhesion force. Since the joints between dissimilar metals are placed inside, there is no problem of rainwater entering.

FIG. 3 is a sectional view showing a modified example of the sliding member 3, and the first
In the sliding member 3 shown in the figure, the recess 4 provided by grooving is replaced by a recess 14 formed by simple pressing in the sliding member 13, and in this case, there is no reduction in wall thickness due to the grooving. , mechanical strength can be increased.

[Effects of the Invention] As described above, according to the present invention, the metal 70- provides a tight bond between dissimilar metals, reduces contact resistance, prevents rainwater from entering, and improves wear resistance. As described above, by expanding the width of the sliding member to be larger than the initial value, the joint becomes even tighter. In addition, in connection with this, internal stress is applied to the sliding member in advance against thermal expansion and contraction due to temperature changes, and compressive force is constantly applied to the joint surface by the sliding member, so that there is little change in electrical resistance.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention at a stage before joining, FIG. 2 is a cross-sectional view at the time of joining, and FIG. 3 is a diagram showing an example of a sliding member. . 1: Frame, 2: Head, 3.13: Sliding member, 4゜14:
Hollow, 5: Roll, 6: Dice. Akira 1 Ibi 2121 Kidney 3m

Claims (2)

[Claims] (1) A long pedestal made of highly conductive metal having a head, and a J-shaped wear-resistant metal sliding member with increased cross section attached to the head, at least inside the sliding member. A composite rigid overhead contact line characterized in that a portion of the head is filled by plastic deformation. (2) A wear-resistant sliding member with an inverted U-shaped cross section is covered with the head of a long pedestal made of highly conductive metal, and an appropriate jig is placed on the underside of the L-shaped head to allow the sliding member to 1. A method for manufacturing a composite rigid overhead contact line, which comprises: 1- compressing the head material against the sliding member to flow-fill the head member so as not to cause A-bar flow;