Patent ID: 9127631
Filing Date: 2015-09-08
Classification: F02M,F04B

Abstract:
1. A fuel pump for a direct injection system provided with a common rail; the fuel pump comprises: at least one pumping chamber defined in a main body; a piston which is mounted sliding inside the pumping chamber to vary cyclically the volume of the pumping chamber; a suction channel connected to the pumping chamber and regulated by a suction valve; a delivery channel connected to the pumping chamber and regulated by a delivery valve; and a high pressure connection, which presents a lower wall placed in contact with a wall of the main body, is connected by a ring weld to the wall of the main body in correspondence of the delivery channel, allows for connecting to a supply duct that feeds fuel under pressure to the common rail, and has innerly a passing through channel through which fuel coming from the delivery channel flows towards the supply duct; wherein the passing through channel comprises a first ring groove, which is obtained through a side wall of the high pressure connection, is disposed in the vicinity of the ring weld, and extends from the side wall of the high pressure connection towards the ring weld; wherein the first ring groove presents a U-shaped cross-section and is spaced-apart from the lower wall of the high pressure connection so that the side wall of the high pressure connection is thicker at the lower wall than at the first ring groove; and wherein a first distance between a bottom of the first ring groove and an outer surface of the side wall of the high pressure connection is about equal to a second distance between an inner end of the ring weld and the outer surface of the side wall of the high pressure connection.