EXHAUST DEVICE OF MULTI-CYLINDER ENGINE

摘要

An exhaust purification device of a multi-cylinder engine which improves exhaust gas purification performance by substantially uniforming a flow rate of exhaust gas throughout a treatment carrier such as a catalyst and improving dispersibility of the exhaust gas from the multi-cylinder engine to the catalyst and other components in the exhaust purification device wherein two collecting pipes are arranged at substantially symmetric positions across a partition plate part, which has a linear cross sectional shape, and is arranged centrally between the pipes which are each formed into D-shaped cross sectional shapes and comprise a first straight line part, a pair of second straight line parts connected with respective ends of a first straight line part and arranged to be substantially parallel with each other, and a circular arc part that connects ends of a pair of second straight line parts on opposite sides of the first straight line part.

主权项

1. An exhaust device of a multi-cylinder engine that divides a plurality of cylinders to two sets of cylinder groups formed by the plurality of cylinders, comprising:
branch pipes which communicate with cylinders of the cylinder groups for each of the two sets of cylinder groups, two collecting pipes configured by collecting the branch pipes to be connected with an exhaust purification device through a taper, and a D-shaped cross sectional shape formed by the two collecting pipes respectively being arranged at substantially symmetric positions across a partition part that has a linear cross sectional shape and is arranged at a central part between the two collecting pipes, wherein the D-shaped cross sectional shape includes a first straight line part, a pair of second straight line parts that are connected with each end of the first straight line part respectively and are arranged to be substantially parallel each other, and an arc part that connects ends of the pair of second straight line parts on the opposite sides of the first straight line part to each other.