Patent ID: 7568736

Claim:
A joint structure of a branch connector for a common rail, comprising a screw sleeve concentric with a bearing surface of a main pipe rail and connecting a branch connector to the main pipe rail via a sleeve washer which has been externally fixed to the branch connector in advance to be combined therewith as one piece, wherein: the branch connector has a main body with an outer surface, at least a portion of which is cylindrical; the sleeve washer has a first end facing substantially towards the main pipe rail, a second end opposite the first end and an inner surface extending from the first end to the second end, the inner surface having a first longitudinal section in proximity to the first end of the sleeve washer, the first longitudinal section being cylindrical and being fixed rigidly to the outer surface of the main body of the branch connector; and the inner surface having a second longitudinal section extending from the first longitudinal section of the inner surface of the sleeve washer to the second end of the sleeve washer, the second longitudinal section being spaced outwardly from the outer surface of the main body of the branch connector so that a clearance is provided between the inner surface of the sleeve washer and the outer surface of the branch connector along the second longitudinal section of the inner surface of the sleeve washer, wherein the clearance is provided by a taper surface formed by outwardly enlarging a diameter of the inner surface of the sleeve washer along the second longitudinal section.