| 摘要 |
A fuel injection line for an internal combustion engine is provided at least one of its ends with a compression nipple formed thereon by upsetting, with a sealing taper portion having a sealing surface at a taper angle relative to the axis of the nipple. The taper portion, with plastic deformation of its sealing surface, serves for sealing against a hollow taper surface, with a corresponding taper angle, of a co-operating portion which is harder than the sealing surface of the nipple. Its rearward bearing surface which is intended for bearing against a hollow taper surface of a cap nut for fixing the nipple is in the form of a spherical segment which blends into the outside peripheral surface of the adjoining pipeline by way of a rounded portion. The injection line is formed from a pipe of steel of cold-worked hardness, the nipple being formed on the pipe and then subjected to inductive soft annealing in its zone in the region at which the surface of its sealing taper portion is in contact against the hollow taper surface of the co-operating portion. |
