Patent ID: 6886537
Filing Date: 2005-05-03
Classification: F02M

Abstract:
1. An accumulation type fuel injection system comprising: a plurality of fuel pipes, the each fuel pipe being formed with a fuel passage therein and a connection head portion at an end thereof; a common rail having a peripheral wall portion, which has an outer peripheral surface whose cross section is formed substantially in the shape of a round and provides an accumulation chamber therein from one end to the other end of the common rail in an axial direction of the common rail, the accumulation chamber communicating with the fuel passages of the fuel pipes; and a plurality of pipe connectors fastened to pipe connecting portions formed on the peripheral wall portion of the common rail for holding the connection head portions of the fuel pipes and for connecting the connection head portions of the fuel pipes to the common rail respectively, wherein the accumulation chamber is formed so that a central axis thereof is deviated from a central axis of the common rail to form a thick wall portion in the peripheral wall portion, the thick wall portion having a thicker wall than other portions of the peripheral wall portion, the pipe connecting portions are formed at the thick wall portion of the peripheral wall portion, the pipe connectors are screwed to the common rail at the pipe connecting portions, and wherein the pipe connector includes: a connector main body formed substantially in the shape of a circular pipe, which is fastened to an inner periphery of the pipe connecting portion to make an adhesion surface of the pipe connector adhere to a pressure receiving seat surface of the pipe connecting portion with a predetermined fastening axial force, and a nut fastened to an outer periphery of the connector main body to make an adhesion surface of the connection head portion of the fuel pipe adhere to a pressure receiving seat surface of the connector main body with a predetermined fastening axial force.