Patent ID: 9664163
Date: 2017-05-30
CPC Classifications: F02M,F16L

Claim:
1. A terminal structure of a high-pressure fuel pipe for a direct injection engine, comprising a connection head brazed to an end of a steel or stainless steel fuel pipe, the connection head having a spherical or a curved-face pressing seat face at a distal end thereof and a fuel pipe insertion portion on an end opposite of the pressing seat face, wherein the end of the fuel pipe continued from the fuel pipe insertion portion of the connection head has a two-stage drawn portion, an outer diameter D 1 of a first-stage drawn portion located on the side of the connection head, relative to a fuel pipe diameter D, satisfying 0.8≦D 1 ≦0.9 D, wherein a length L 1 of the first-stage drawn portion having the outer diameter D 1 from an end of the fuel pipe insertion portion in an axial direction of the pipe satisfies L 1 ≧0.06 D, and wherein a second-stage drawn portion continued from the first-stage drawn portion has a straight pipe portion having an outer diameter D