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Method to manufacture a common rail

A technology of common rail and concave part, which is applied in the direction of engine components, machines/engines, charging systems, etc., and can solve the problems of increasing quality and cost

Inactive Publication Date: 2017-09-29
DELPHI INT OPERATIONS LUXEMBOURG S A R L
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Unfortunately, ongoing optimization of common rails negatively increases the mass and cost of these methods

Method used

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  • Method to manufacture a common rail

Examples

Experimental program
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Effect test

Embodiment Construction

[0027] Although the expression "common rail" is often used to refer to the fuel injection system as a whole, in the context of this specification, "common rail" refers to a reservoirs and components capable of withstanding fuel pressures of several kilobars.

[0028] refer to figure 1 , figure 1 A common rail assembly 10 is shown comprising a common rail 12 provided with a pressure sensor 14 and a pressure limiting valve 16 . The common rail 12 is an elongated metal body 18 extending along the main axis X from a first transverse face 22 (on the left side of the figure, on which the pressure sensor 14 is arranged) delimiting a first end 22. 22 ) to a second transverse face 24 defining a second end 26 (on the right side of the figure, at which second transverse face 24 the valve 16 is arranged).

[0029] The body 18 of the common rail 12 is provided with figure 2 Axial bore 28 visible in axial section of , which defines an internal volume V of the common rail open at both e...

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Abstract

The invention discloses a method to manufacture a common rail. The method for manufacturing a common rail (12) adapted to be arranged in a fuel injection system is disclosed, the common rail (12) having a body (18) provided with a bore (28) defining an internal volume (V), said body (18) extending along a main axis (X) from a first extremity (22) having a first threaded female recess (30) to, a second extremity (26) having a second threaded female recess (44), the bore (28) opening at both ends in one of the recesses (30, 44), the method (100) comprising the steps of a first autofrettage step (130) of said bore (28), an autofrettage fluid (AF) being pressurized to a first pressure (PI) in the bore (28) during this first step (130) and, second autofrettage step (140) for treating the first female threaded recess (30), the autofrettage fluid (AF) being pressurized to a second pressure (P2) in the first recess (30) during this second step (140).

Description

technical field [0001] The present invention generally relates to a method of manufacturing a common rail. Background technique [0002] As is well known, the common rail, which is an integral part of the fuel injection system, is made of steel and has an elongated tubular shape. The sides are provided with connecting protrusions for complementary engagement of high-pressure pipes. At its two ends the common rail is provided with recesses which are threaded for the complementary arrangement of pressure sensors on one side and on the opposite side of pressure regulating means such as passive valves or solenoid control valves. The manufacture of the common rail includes known steps such as forging the blank and then machining the common rail internal volume and threaded recesses. The recess generally has a larger diameter than the internal volume, so the wall thickness of the common rail suddenly decreases as the internal diameter increases. In use, the common rail is fille...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/12F02M55/02
CPCC21D7/12F02M55/025F02M2200/8053F02M2200/9061F02M61/168
Inventor O·M·坦苏格E·G·皮哈瓦
Owner DELPHI INT OPERATIONS LUXEMBOURG S A R L
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