Patent ID: 6848424

Claim:
An accumulation type fuel injection system having a high-pressure supply pump, which is driven by an internal combustion engine to rotate so that the high-pressure supply pump pressurizes and discharges drawn fuel, and an accumulation device for accumulating the high-pressure fuel discharged from the high-pressure supply pump, the accumulation type fuel injection system supplying the accumulated high-pressure fuel to cylinders of the internal combustion engine through injectors mounted to the cylinders, wherein; the accumulation device has a common rail main body providing an accumulation chamber for accumulating the high-pressure fuel, distributing portions capable of being connected with pressure introduction pipes for introducing the high-pressure fuel accumulated in the common rail main body to the injectors respectively and accessory portions, which are disposed on fuel outlet sides of the distributing portions and are connected with the distributing portions and the pressure introduction pipes respectively in thread connection, and the accessory portion has a sealing member between the accessory portion and a connection object on the distributing portion side, to which the accessory portion is connected in thread connection, the sealing member having a sealing surface substantially in the shape of a spherical surface on the connection object side.