Usui Kokusai Sangyo Kaisha Limited

Eiji Kurata

Iichiro Seino

Provided is a terminal structure of a high-pressure fuel pipe for a direct injection engine which can prevent stress concentration to a brazed portion between a pipe and a connection part effectively. In the terminal structure of a high-pressure fuel pipe for a direct injection engine where a connection head is brazed to an end of a fuel pipe, the end of the fuel pipe continued to a fuel pipe insertion portion of the connection head is provided with a drawn portion, an outer diameter Dof the drawn portion to a fuel pipe diameter D satisfies 0.8D&#x2266;D&#x2266;0.9D, and a length Lof the drawn portion having the outer diameter Din a pipe-axial direction from an end of the fuel pipe insertion portion satisfies L&#x2267;0.06D.

Terminal structure of high-pressure fuel pipe for direct injection engine

Provided is a terminal structure of a high-pressure fuel pipe for a direct injection engine which can prevent stress concentration to a brazed portion between a pipe and a connection part effectively. In the terminal structure of a high-pressure fuel pipe for a direct injection engine where a connection head is brazed to an end of a fuel pipe, the end of the fuel pipe continued to a fuel pipe insertion portion of the connection head is provided with a drawn portion, an outer diameter D1 of the drawn portion to a fuel pipe diameter D satisfies 0.8D&#x2266;D1&#x2266;0.9D, and a length L1 of the drawn portion having the outer diameter D1 in a pipe-axial direction from an end of the fuel pipe insertion portion satisfies L1&#x2267;0.06D.

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Shimizu-cho, Japan

Eiji Kurata