Exhaust-gas recirculation device

Abstract

An exhaust-gas recirculation device is configured to be attached to a cylinder block including cylinders individually including built-in pistons and cause a portion of exhaust gas flowing through an exhaust system to recirculate to an intake system. The exhaust-gas recirculation device includes an intake manifold, a recirculation pipe, and a recirculation manifold. The intake manifold includes intake branches each including an intake passage communicating with an intake port and is configured to be disposed at the cylinder block. The recirculation pipe is coupled to an exhaust manifold capable of guiding the exhaust gas outward. The recirculation manifold includes recirculation branches each provided with a recirculation passage communicating with the intake passage via an introduction hole and is coupled to the recirculation pipe. The introduction hole has an inner diameter at a recirculation-passage side that is larger than an inner diameter at an intake-passage side.

Dependencies are inferred from the claim text.