JPH05161337A - Metallic bush for mounting mold coil - Google Patents

Abstract

PURPOSE:To improve the traveling property of a vehicle by suppressing the eddy current occurring in the bolt mounting metallic bush buried in the ground coil for a superconducting magnetic levitation type railway. CONSTITUTION:In a metallic bush 8 buried in a ground coil, a plurality of ribs 7 are provided radially in the vertical direction to the mounting flange face of the metallic bush 8, whereby the resistance of an eddy current circuit is increased to lessen a generated current.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground-side molded coil installed on a track of a magnetic levitation railway.

[0002]

2. Description of the Related Art In a ground coil installed on a track of a magnetic levitation railway, mechanical vibrational stress such as electromagnetic vibration and wind pressure when a vehicle passes and environmental stress caused by being exposed outdoors are always present. Since they are added in duplicate, the ground coil installed on the track is required to have sufficient strength and durability to be fixed to the side wall of the track by bolting. A conventional ground coil will be described with reference to FIGS.

The ground coil 1 is formed by casting and molding an aluminum conductor with resin, and this is fixed to the side wall of the track with bolts. If the resin-molded portion of the coil is bolted directly for this fixing, the resin may die due to long-term use and the bolt-tightened portion may be loosened. Therefore, conventionally, when the mold coil 1 is cast-molded,
The metal bush 2 is embedded in the bolt mounting position, and the structure is such that the metal bush 2 is bolted and mounted via the metal bush 2.

As shown in FIG. 8, the metal bush 2 has a thick-walled cylindrical body 3, and a mounting bolt penetrates a center hole of the body 3. The outer surface 4 of the body 3 of the metal bush 2, which is the surface of the coil that adheres to the resin, has a drum-shaped cylindrical shape in which the middle portion is inflated to enhance the adhesiveness to the resin.

[0005]

When the ground coil having such a structure is fixed to the side wall of the track, the metal bush 2 for fastening the bolts embedded in the ground coil 1 has a superconducting body on the vehicle body side when the vehicle passes through. An eddy current is generated due to the magnetic field of the coil, which acts as a magnetic drag on the superconducting coil on the vehicle upper side, which causes a large running resistance in the vehicle.

In view of the above, the present invention provides a metal bush that suppresses the generation of eddy currents while maintaining the required strength and durability of the ground coil 1 to improve the running performance of the vehicle. The purpose is to measure.

[0007]

In order to suppress the eddy current loss flowing in the mounting metal bush of the ground coil, the metal bush is made of a metal bush having a high resistance value of the eddy current circuit. That is, the bush material may have a large specific resistance, the length of the eddy current circuit may be increased, or the cross-sectional area of the eddy current circuit may be reduced.

For this reason, the body of the metal bush is formed of a thin, drum-shaped cylinder, and a plurality of ribs are radially provided on the inner side surface of the body vertically between the mounting collars. By doing so, the inside of the metal bush has a hollow structure, and the cross-sectional area of the eddy current circuit becomes small or the eddy current circuit becomes long.

[0009]

With such a structure, an eddy current circuit is formed along a surface parallel to the mounting flange surface of the metal bush when the vehicle passes. However, since the inside of the metal bush is hollow with only ribs, the cross-sectional area parallel to the mounting flange surface is smaller than that of the conventional one, and the resistance of the eddy current circuit increases and the current generated. Is small.

On the other hand, since the outer surface of the metal bush, which becomes the contact surface with the resin when the metal bush is embedded in the mold coil, is a drum shape similar to the conventional one, the adhesiveness to the resin and the vicinity of the adhered surface The strength of the ground coil is the same as the conventional one.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on the embodiments shown in FIGS.

A thin-walled cylinder having a drum-shaped outer surface is used as a body 5, and mounting collars 6 and 6 are provided on both end surfaces of the body 5.
Eight elongated ribs 7 directed toward the center are provided on the inner surface of the plate between the mounting flanges 6 at both ends. The outer side surface 4 of the metal bush 8 which is an adhesion surface with the ground coil 1 resin is formed in a drum shape with a bulged central portion as in the conventional case. As shown in FIG. 7, such metal bushes are arranged at a plurality of locations such as four corners of the ground coil 1 and the coil peripheral portion, and are used for mounting the track side wall.
A case where the ground coils 1 and 1 are stacked in two steps and attached to the side wall of the track will be described with reference to FIG.

The two ground coils 1, 1 stacked in two stages are
The mounting bolts 9 are passed through the respective metal bushes 8 and tightened with the nuts 10 and fixed to the concrete track side wall 11. When the train is running, an eddy current circuit is formed inside the metal bush 8 along a plane parallel to the mounting flange surface 6. However, since the metal bush 8 has only the rib 7 inside and is hollow, the cross-sectional area parallel to the mounting flange surface 4 is smaller than that of the conventional metal bush 2, and the resistance of the eddy current circuit is increased. Therefore, the generated current is small.

The metal bush 8 is embedded in the ground coil 1 molded with resin. The outer surface 4 of the contact surface between the metal bush 8 and the ground coil 1 has a drum shape with a bulged central portion as in the conventional case. The adhesiveness with the resin and the strength of the ground coil 1 at the position of the adhering surface are the same as the conventional ones.

Further, when the metal bushes 8 are mounted on the concrete track side wall 11, the two-stage metal bushes 8 and 8 are pressed in a direction perpendicular to the mounting flange surface 6.
Since it is provided, it is possible to maintain the same strength as the conventional one. Four other examples of the present invention will be described. Other Example 1 (see FIG. 3)

Instead of the rib 7 provided inside the metal bush, a rib 12 is provided on the outer surface of the metal bush. Although the outer shape is not a drum shape, since the rib 12 is provided on the outer side surface, the adhesiveness between the metal bush 13 and the ground coil 1 resin can obtain the same effect as in the previous example. Other Example 2 (see FIG. 4)

Inner ribs 15 and outer ribs 16 are provided on the inner and outer side surfaces of the metal bush 14, respectively. Also in this example, as in the previous example, the outer rib 16 can maintain good adhesiveness with the resin. Other Embodiment 3 (see FIG. 5) Although the mounting flange surfaces 17, 17 at both ends are connected only by the ribs 18, the resistance value of the eddy current circuit can be further increased because there is no outer shell (body). it can. Other Example 4 (see FIG. 6)

A metal bush 21 in which upper slits 19 and lower slits 20 are alternately provided on an outer shell (body) between the ribs 7 and the ribs 7 is vertically arranged. Not only is the cross-sectional area parallel to the mounting flange surface 6 small, but the upper slit 19 and the lower slit 20 make the eddy current circuit longer, and the resistance value of the eddy current circuit can be made higher.

[0019]

According to the present invention, the metal bush embedded in the ground coil reduces the eddy current generated when the train passes through without impairing the conventional strength, and improves the running performance and reliability of the superconducting levitation railway. Can be planned.

[Brief description of drawings]

FIG. 1 is a perspective sectional view of a metal bush according to the present invention.

FIG. 2 is a perspective view of a track side wall mounting of a ground coil according to the present invention.

FIG. 3 is a perspective view of a metal bush of another embodiment 1 of the present invention.

FIG. 4 is a perspective sectional view of another embodiment 2 of the present invention.

FIG. 5 is a perspective sectional view of another embodiment 3 of the present invention.

FIG. 6 is a perspective sectional view of another embodiment 4 of the present invention.

FIG. 7 is a perspective view of a ground coil.

FIG. 8 is a perspective sectional view of a conventional metal bush.

[Explanation of symbols]

 1 Ground coil 2, 8, 13, 14, 21 Metal bush 3, 5 Body 4 Outer side surface 6, 17 Mounting collar 7, 12, 15, 16, 18 Rib

Claims (3)

[Claims] 1. A metal cylindrical body having mounting flanges at both ends, and a plurality of elongated ribs radially formed on at least one of an outer surface or an inner surface between the mounting flanges. Metal bush for mounting molded coil. 2. A metal bush for mounting a mold coil according to claim 1, wherein slits are provided in the cylindrical body portion between the radially elongated ribs. 3. A metal bush for mounting a mold coil, characterized in that a pair of circular mounting collars are placed at intervals and are connected by a plurality of elongated ribs.