Patent ID: 6807944
Filing Date: 2004-10-26
Classification: F02M

Abstract:
A method for attenuating pressure pulsation in an opposed type engine comprising, in a system in which for each of a pair of cylinder banks a returnless type fuel delivery pipe communicates with a plurality of injection nozzles and does not return fuel to the fuel tank and the cylinder banks each comprise a plurality of cylinders of an opposed engine having such banks disposed in a horizontally opposed or V-shaped manner, connecting a connecting pipe to the pair of fuel delivery pipes, and connecting the connecting pipe at an intermediate portion thereof to a supply pipe communicating with a fuel tank, the fuel delivery pipes being configured so as to be capable of absorbing and reducing pressure pulsation arising at time of fuel injection by the injection nozzles by means of elastic deformation of the outer walls thereof, whereby pressure pulsations with opposite phases arising from the fuel injection performed alternatingly between the cylinder banks by the injection nozzles are propagated to the connecting pipe and are caused to interfere with and attenuate each other in the supply pipe at or near intersection thereof with the intermediate portion of the connecting pipe.