Patent ID: 7107678
Filing Date: 2006-09-19
Classification: B29C,B29L,F02D,Y10T

Abstract:
1. A forming method of a throttle apparatus for an internal combustion engine, the throttle apparatus including a substantially tubular throttle body and a substantially disc-shaped throttle valve, the throttle valve having an axis around which the throttle valve rotates in the tubular throttle body between a closed position and an open position, the throttle valve and the throttle body being molded substantially simultaneously in same molding dies in such a manner that the throttle valve is rotated by a predetermined angle with respect to a full closed position in which the throttle valve and the throttle body define a minimum gap therebetween, the forming method of the throttle apparatus, comprising: clamping a pair of molding dies to form a body cavity and a valve cavity therein, the body cavity being for molding a throttle body and the valve cavity being for molding a throttle valve in such a manner that the throttle valve is rotated by a predetermined angle with respect to a full closed position, in which the throttle valve and the throttle body define a minimum gap therebetween; so that the throttle valve is not in contact with an inner bore surface of the throttle body; substantially simultaneously injecting a melted material into the body cavity and the valve cavity; moving one of said dies away from the other of said dies; and protruding an ejector into the cavities in order to eject a solidified molding, wherein the melted material is injected into the valve cavity through a plurality of valve gates each of which are symmetrically located about said axis.