Sealing structure for electrical parts

Abstract

The present invention relates to a rotary type electrical part and particularly to a throttle position sensor used within an automobile. The electrical part comprises a casing having one end thereof defined as an opening face, an attachment hole defined in the other end thereof, and a hollow cylindrical body formed therein which extends at right angles to the side of the casing, the casing further having an air passage which is defined in the side thereof and communicates with a hollow portion of the cylindrical body, a driving shaft having one end projecting from the attachment hole and rotatably mounted within the casing, a sliding-element receive attached to the other end of the driving shaft and rotated in response to the rotation of the driving shaft, an insulating substrate disposed adjacent to the sliding-element receiver in the casing and in an opposing relationship thereto and having a conductive pattern formed on the surface of the insulating substrate, the conductive pattern disposed in an opposing relationship to the sliding-element receiver, sliding elements mounted on the sliding-element receiver in such a manner that the sliding elements are brought into sliding contact with the insulating substrate in a face-to-face manner, and a connector having contacts whose outer side is provided with a sealing member mounted thereon and whose tip portions are received with terminals fixed to the conductive pattern inserted therein. In addition, a cover is fitted onto the opening face of the casing and a filler material is charged into a region between the cover and the inner-wall face of the casing, and an opening face of the cylindrical body is sealed tight with the sealing member after press-fitting of the connector into the cylindrical body.