Patent ID: 6536806
Filing Date: 2003-03-25
Classification: F02B,F02M,F16L

Abstract:
A high-pressure fuel injection pipe comprising:a thick-walled outer tube unitarily formed of stainless steel and including opposed longitudinal ends, an inner surface of substantially constant inside diameter along the length of said outer tube, an outer surface defining an outside diameter of not more than 15 mm along a major portion of the outer tube, said outer tube being thicker adjacent at least one said longitudinal end to define an enlarged connecting head with a face configured for engagement with a mating partner; an inner tube unitarily made of a thin metal having a high corrosion resistance and a high strength, said inner tube being disposed within said outer tube and extending along the entire length of said outer tube, said inner and outer tubes being doubly drawn for simultaneous integral reduction of both said inner and outer tubes, such that an abutting fixed engagement that is free of welds is defined between the inner circumferential surface of said outer tube and said inner tube along the entire length of said outer tube without heat treating said tubes.