Toyota Jidosha Kabushiki Kaisha

Kazuhiko Seguchi

Hiroshi Oyagi

Hirokazu Ito

Akira Hojo

An exhaust purifying apparatus includes an exhaust manifold, a cylindrical catalytic converter, and a cylindrical connection portion that connects the catalytic converter to the exhaust manifold. The exhaust manifold is connected to a side surface of the connection portion. The connection portion is connected to the catalytic converter so as to have the same central axis as the catalytic converter. The connection portion includes a constriction at a part connected to the catalytic converter. A part of the connection portion on an upstream side of the constriction defines a collision diffusion chamber. The cross-sectional flow area of the connection portion orthogonal to the central axis is smaller at the constriction than in the collision diffusion chamber. The constriction is not provided in a vertically lower part of the inner wall of the connection portion in a mounted state of the internal combustion engine.

Exhaust purifying apparatus for internal combustion engine

In an exhaust gas control apparatus for an internal combustion engine in which a catalytic converter is attached to an engine having a plurality of cylinders and a plurality of exhaust passages communicating with the plurality of cylinders, a diffusion portion that promotes a jet flow of a main flow of the exhaust gas flowing into the merging portion is provided at a merging portion connected to a downstream side of the exhaust passage. Further, on the inner wall of the merging portion facing the inlet of the exhaust gas provided in the exhaust passage, a dispersion face for three-dimensionally dispersing the main flow of the exhaust gas flowing linearly into the merging portion from the inlet is formed.

Growing community of inventors

Shizuoka-ken, Japan

Kazuhiko Seguchi