| 摘要 |
PURPOSE: To provide cost reduction by preventing burrs from occurring at the intersecting part of a fuel passage and a branch hole, opening 'the intersecting part completely and omitting a process of removing the burrs after its forming, improve straightness accuracy of the fuel passage and achieve the light weight of a fuel distribution pipe. CONSTITUTION: A fuel distribution pipe 1 for a straight four-cylinder internal combustion engine is constructed by integrally-forming, with resin, a main part 2 provided with a fuel passage 4 whose top end is closed and four injector fitting parts 3A-3D provided with injector insertion holes 5A-5D which communicate crossing a fuel passage 4 at roughly right angles. In this construction, a taper part of a core 11 for forming the fuel passage is contact-supported from the underside by three cores 12A-12C for forming the injector insertion hole, and under such a condition as a fixed diameter part 11a of the core 11 for forming the fuel passage is inserted and held by a through hole 14 in a core 12D for forming the injector insertion hole, resin material is injected into a metallic mold to form the main part 2 and the injector fitting parts 3A-3D. |
