Claims
- 1. A common rail fuel injection system having a common rail housing, the common rail housing comprising:
a pressure accumulation pipe, whose outer circumference is formed in roughly complete round shape in cross section, being provided inside with a pressure accumulation chamber having given shaped cross section and extending in a longitudinal direction thereof, outer circumference of the given cross section having a first portion whose curvature is smaller than that of complete round shape having an area equal to that of the given cross section; and a blanch pipe being provided inside with a fuel conduit bore, wherein the blanch pipe is connected to the pressure accumulation pipe so that the fuel conduit bore and the pressure accumulation chamber intersect nearly perpendicularly to each other at the first portion.
- 2. A common rail fuel injection system according to claim 1, wherein wall thickness of the pressure accumulation pipe is thickest at the first portion.
- 3. A common rail fuel injection system according to claim 1, wherein the given shaped cross section of the pressure accumulation chamber is formed in roughly flat oval shape.
- 4. A common rail fuel injection system according to claim 1, wherein the given shaped cross section of the pressure accumulation chamber is formed in roughly oval shape.
- 5. A common rail fuel injection system according to claim 4, wherein a method of manufacturing the common rail housing comprises steps of:
forming a product whose outside configuration is equal to that of the pressure accumulation pipe; drilling a round hole in the product in a longitudinal direction thereof, diameter of the round hole being equal to a minor axis length of the oval in cross section of the pressure accumulation chamber; and removing opposite sides of an inner wall of the round hole in a longitudinal direction thereof by one of ways of broaching and electrical discharge machining so that the pressure accumulation chamber having the oval shaped cross section is formed.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2000-111520 |
Apr 2000 |
JP |
|
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application is based upon and claims the benefit of priority of Japanese Patent Application No. 2000-111520 filed on Apr. 13, 2000, the content of which is incorporated herein by reference.