Connecting head structure for high-pressure fuel injection pipes
A thick-wall small-diameter high-pressure fuel injection pipe has a spherical seat surface, an annular flange, and a conical surface continued from the seat surface at a connecting end of the pipe. If the pipe is configured so that t (thickness)/D (outer diameter)<0.3, then an axial distance from the connecting head end to the back face of the annular flange is 0.38D to 0.6D, a spherical radius of the seat surface is 0.45D to 0.65D, the annular flange outer diameter is 1.2D to 1.4D, and an inner peripheral surface of the head has a substantially flat cylindrical surface or a conical surface. If the pipe is configured so that t (thickness)/D (outer diameter)≧0.3, then the axial distance from the connecting head end to the back face of the annular flange is 0.38D to 0.7D.
Usui Kokusai Sangyo Kaisha Limited
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Koichi Nobuo Shoichiro
Hayashi Kato Usui