JPH063982B2 - Method for manufacturing sliding current collector - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an improvement of a sliding current collector, and more particularly to an improvement of a sliding current collector used in a slip ring, a commutator, a pandagraph or the like of a rotating electric machine. It is about.

[Background of the Invention]

Generally, sliding current collectors include collectors of pantographs for electric trains, slip rings and commutators of rotating electric machines, and brushes that slide on the commutators and slip rings. Hereinafter, a conventional sliding current collector will be described with reference to FIGS. 1 to 7.

Fig. 1 shows a case where electric power is supplied from an overhead wire of a train,
The conductive portion 2 slides on the overhead wire 1, the conductive portion 2 is supported by the support fitting 5 via the insulating portion 4, and the current guided to the conductive portion 2 is supplied to the rotating electric machine or the like via the lead wire 3. . 2 and 3 show the structure of a slip ring applied to the collection of electric power of a rotary electric machine. The slip ring is inserted in the shaft 6, but the slip ring 8 is made of copper, middle, gun metal or SUS.
And the like, and is attached to the outer periphery of the insulating portion 9. The insulating portion 9 is attached to the outer periphery of the shaft 6 via a metal cylinder 10 to electrically insulate the shaft side and the slip ring 9 from each other.
Current flows from the slip ring 8 to the winding or the like via the lead wire 3. In both FIGS. 1 and 3, a conductive portion and an insulating portion are manufactured, respectively, and both are assembled to form a slip ring, which has a drawback that the number of parts is large and the number of steps is long.
Further, the current collector has a problem that the friction phenomenon is accelerated at a high temperature when friction and an arc are generated due to sliding and energization of the current collector and the temperature of the current collector becomes high.

FIG. 4 shows the structure of a commutator whose structure is further complicated.
The commutator pieces 11 are arranged along the circumference on the outer circumference of the V-box 12 via an insulating part 9 such as mica, and an insulating part is also provided between the commutator parts with an interstage mica (not shown) to generate electricity. Are electrically insulated and the V ring 13 is tightened to manufacture a commutator.
A brush 7 is supported on the outer circumference of the commutator by a brush holder 7c and slides on the commutator to transfer power. FIG. 5 shows a case of a molded commutator, which is the same as that of FIGS. 4 and 5 after the commutator pieces 11 are formed in a cylindrical shape at a predetermined interval and molded to form the insulating portion 9. It connects to the armature winding 15 that enters the armature core slot 14 to power the winding. FIG. 6 shows a cross section taken along the line BB ′ of FIG. 5, which is composed of a commutator piece 11 which is a conductive portion and a mold portion 9 which is an insulating portion, and between the mold portion 9 and the shaft 6. Has a metal cylinder inserted. Further, FIG. 7 shows a case of a flat plate commutator, in which fan-shaped commutator pieces are arranged in a circular shape, fixed by a molding material 9, and inserted into a shaft through a metal cylinder 10. As described above, also in the case of a commutator, a step of manufacturing and assembling a commutator piece (generally a copper material) that is a conductive portion, a mica molded product or a molding material that is an insulating portion, and a metal cylinder that supports this is taken. In particular, commutator pieces are required to have high manufacturing precision so that they do not pop out due to centrifugal force. As described above, the conventional sliding current collector has a large number of parts, and has a drawback that a large number of man-hours are required to manufacture and assemble each part.

[Object of the Invention]

The object of the present invention is to reduce the number of parts and to provide excellent heat resistance by composing a current collector for conducting an electric current, a slip ring and a commutator with ceramics, and in particular by integrally sintering a conductive part and an insulating part. Another object of the present invention is to provide a method for manufacturing the sliding current collector of this type.

[Outline of Invention]

That is, the present invention provides a method for manufacturing a sliding current collector including a conductive portion mounted and fixed on a support member and an insulating portion interposed between the conductive portion and the support member. And, the insulating portion, each of which is made of a raw material powder of conductive ceramics and insulating ceramics, is molded into a predetermined shape of each of the individual portions, solidifies each by preliminary heating, and assembles the solidified both integrally, It is characterized by a manufacturing process in which both of them are heated in a pressurized state at a temperature higher than the melting point of copper and integrally sintered to form the sliding current collector.

Example of Invention

 An embodiment of the present invention will be described below with reference to FIGS.

FIG. 8 shows a current collecting structure of the present invention, in which the current from the overhead wire 1 is guided to the conductive portion 2a of the integrally sintered ceramic of the conductive portion 2a and the insulating portion 2b, and the lead wire 3 fixed to the conductive portion is used to rotate the electric machine or the like. The structure which supplies electric power to is shown. FIG. 9 shows a structure in which the conductive portion 8a and the insulating portion 8b are integrally sintered by the slip ring of the present invention, and the gap 8c between the conductive portions 8a may be integrally sintered and then provided with a groove by machining.

In order to integrate such a conductive portion and an insulating portion, a raw material powder for forming a ceramic having conductivity and a raw material powder for forming a ceramic having insulating properties are prepared, and the conductive portion and the insulating portion are formed in advance. The ceramic raw material powder is solidified into a predetermined shape, solidified by preheating, and then both are assembled together,
By heating at a temperature higher than the melting point of copper under pressure, ceramics having electrical conductivity and insulation are integrally produced.

The current collector thus formed has a sintering temperature of at least higher than the melting point of copper even if the current collector becomes hot due to friction and arc caused by sliding and energizing with the current collector. Since it is shaped, the heat resistance and arc resistance are improved and the amount of wear of the current collector can be reduced as compared with the current collector formed of conventional copper or an alloy using the same.

In the case of the slip ring shown in FIG. 9, the insulating raw material powder is put on the inner peripheral side of the mold, and the conductive raw material powder is put on the outer peripheral side thereof, and then heated under pressure, thereby the outer circumference of the cylinder is increased. It is possible to obtain an integrated ceramic slip ring having a conductive side and an insulating inner side. FIG. 10 is a sectional view taken along the line BB 'in FIG. The placement of the raw material powder is set by using a gravity field or a centrifugal force field depending on the shape required by the product.

FIG. 11 shows a commutator in the same manner as in the case of a slip ring, in which the conductive part 11a and the insulating part 11b are integrally sintered on the outer circumference and the inner circumference of the cylinder, and the insulating part 1 is formed by machining or electric discharge machining.
Commutator element 1 that requires a groove 16 to enter the region of 1b
The number of 1a is provided. Note that FIG. 12 shows C- of FIG.
The cross section of the commutator seen from the C'line is shown. FIG. 13 shows a plate commutator in which a commutator piece 11a, which is a conductive part, and an insulating part 11.
b is formed as a flat plate layer, and similarly to the cylindrical commutator shown in FIG. 12, radial grooves are formed by machining or electric discharge machining so as to form a fan-shaped commutator piece (not shown).

FIG. 14 has the same shape as the cylindrical commutator shown in FIG. 12, but is larger than the resistance of the conductive portion and smaller than the resistance of the insulating portion between the commutator piece 11a which is the conductive portion and the insulating portion 11b. The configuration is shown in which the resistance portion 11c is provided to form a ceramic integrally sintered, and the groove 16 is provided by machining, electric discharge machining, or the like to form a commutator. Further, FIG. 15 shows the configuration in the case where the medium resistance portion 11c is provided in the plate commutator. In this way, the medium resistance part is provided by arranging the ceramic raw material powder that becomes the medium resistance part between the raw material powder that becomes the conductive ceramics and the raw material powder that becomes the insulating ceramics, and integrate them by heating under pressure. Can be converted. Also in this case, the respective parts may be solidified in advance and combined to be integrally sintered. As described above, the present invention can be manufactured by arranging the raw material powder of the conductive part and the insulating part or the conductive part, the medium resistance part and the insulating part before the sintering into ceramics and integrally sintering. As a result, the present invention has an effect that the number of parts is small and the number of manufacturing steps can be significantly reduced in manufacturing a current collector, a slip ring or a commutator.

Further, since the sintering temperature of ceramics is higher than the melting point of copper, there is an effect that a current collector, slip ring and commutator having excellent heat resistance and arc resistance can be obtained.

Although the metal cylinder on the inner peripheral side is not shown when inserting the slip ring or the commutator into the shaft in this embodiment, a metal cylinder or an insulating cylinder may be provided if necessary.

〔The invention's effect〕

According to the present invention, the conductive part and the insulating part in the sliding current collector can be integrally formed by using the raw material powders of the conductive ceramics and the insulating ceramics as a material, so that the number of parts is small and the manufacturing process is drastically reduced. There is an effect that can be reduced. Further, since the sliding current collector is entirely made of ceramics, there is an effect of excellent heat resistance.

[Brief description of drawings]

FIG. 1 is a perspective view of a conventional current collector, FIGS. 2 and 3 are radial and axial sectional views of a conventional slip ring, FIG. 4 is a conventional commutator, and FIGS. Sectional view of the child, FIG. 7 is a plan view and a sectional view of the flat plate commutator, FIG. 8 is a perspective view of the current collector of the present invention, and FIGS. 9 and 10 are sectional views of the slip ring of the present invention. 12 is a sectional view of a commutator of the present invention, FIG. 13 is a sectional view of a flat plate commutator, FIG. 14 is a sectional view of a commutator provided with a medium resistance portion of the present invention, and FIG. 15 is a sectional view of the present invention. It is sectional drawing of the flat plate commutator which provided the resistance part. 8 ... Slip ring, 8a ... Slip ring conductive part, 9
... Insulation part, 8b ... Slip ring insulation part, 11 ... Commutator piece, 11a ... Commutator conductive part (commutator piece), 11b ... Commutator insulation part, 11c ... Commutator medium resistance part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masatoshi Watanabe Inventor Masatoshi Watanabe 3-1-1 Hitachi City, Ibaraki Hitachi Ltd. Hitachi Research Laboratory (72) Inventor Noriyoshi Takahashi 3-chome, Hitachi City, Ibaraki Prefecture No. 1 In Hitachi Research Laboratory, Hitachi Ltd. (72) Inventor Ryutaro Jimbo 3-1-1, Saiwaicho, Hitachi City, Ibaraki Hitachi Incorporated Hitachi Research Laboratory, Hitachi Ltd. (72) Yasuo Matsushita Hitachi City, Ibaraki Prefecture 3-1, 1-1 Sachimachi Hitachi, Ltd. Hitachi Research Laboratory (72) Inventor Yasuyuki Wachi 4-6, Kanda Surugadai, Chiyoda-ku, Tokyo Hitachi, Ltd. (72) Yoshimitsu Mihara Chiyoda-ku, Tokyo Kanda Surugadai 4-6 Hitachi, Ltd. (56) Bibliography Sho 49-72909 (JP, U) JP 45-8138 (JP, B1)

Claims (1)

[Claims] 1. A method of manufacturing a sliding current collector comprising a conductive portion mounted and fixed on a support member and an insulating portion interposed between the conductive portion and the support member, wherein the conductive portion is provided. And the insulating portion is formed by using the raw material powder of the conductive ceramics and the insulating ceramics as a material, molding each of the individual portions into a predetermined shape, solidifying each by preheating, and assembling the solidified both integrally. A method for manufacturing a sliding current collector, characterized in that the sliding current collector is formed by heating the both in a pressurized state at a temperature higher than the melting point of copper and integrally sintering the two.