Ntn Corporation

Shougo Kanbe

Eiichirou Shimazu

Kayo Sakai

Takayuki Oda

Provided is an electric transmission device that is provided at relatively rotating parts of a mechanical apparatus. The electric transmission device (E) includes a pair of magnetic elements (A,B) relatively rotatable about the same axis (O). The magnetic elements (A,B) each includes a core (A,B) and a coil (A,B) having a conductive wire. One of the coil (A) and the coil (B) is located at an inner side of the other coil in a radial direction, and the coils (A andB) are magnetically coupled to each other. Each bobbin (A,B) includes a cylinder (A,B) and a dis-shaped flange (A,B). The flanges (A,B) are slidably in contact with each other at contact surfaces () thereof in the axial direction.

Electric transmission device in relatively rotating parts

To provide a magnetic element such as a pot-shaped inductor in which a coil is covered by a magnetic body, having excellent cooling performance and being capable of suppressing heat generation. An inductoras the magnetic element is provided with a coil formed by winding a winding wire, a magnetic bodyin which the coilis arranged and which transmits magnetic flux generated by the coil. The magnetic bodyincludes an air-cooling portion for air-cooling the magnetic element, on a magnetic body outer diameter portion which covers an outer diameter side of the coil. The air cooling portion is formed of a slitas a hole structure penetrating the magnetic body outer diameter portion. Further, in a configuration in which the coil is sealed by a sealing resin, the magnetic body includes a flow control path, which controls a flow of the resin in filling the sealing resin, on a surface facing the coil.

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Aichi, Japan

Shougo Kanbe