Common rail for diesel engines
a diesel engine and common rail technology, applied in the direction of fuel injection apparatus, charge feed system, metal-working apparatus, etc., can solve the problems of applying auto-frettage, achieve excellent durability, increase the fatigue strength of inner pressure, and high compressive residual stress
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[0032] In the invention, reference numeral 1 denotes a main pipe rail, 1-1 a flow passage, 1-2 a branch hole, 1-3 a pressure-receiving seat surface, 1-4 a boss portion, 1-4a a male thread, 1-5 a flattened surface, 2 a branch pipe, 2-1 a flow passage, and 2-2 a projection.
[0033] The main pipe rail 1 or common rail shown in FIGS. 1 to 4 is a forging of a material S45C or the like. The main pipe rail 1 has a tubular portion, which is relatively thick-walled to have, for example, a diameter of 28 mm and a wall thickness 9 mm. An axial interior is subjected to machining, such as boring, gun drilling, or the like, to make the flow passage 1-1, and boss portions 1-4 are provided on a peripheral wall to be axially spaced from one another.
[0034] In the common rail shown in FIGS. 1 and 2, branch holes 1-2 having a predetermined diameter are formed in the boss portions 1-4 which are integral with the main pipe rail 1 The branch holes 1-2 communicate with the flow passage 1-1 of the main pipe...
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