US 12,297,764 B1
Exhaust purifying apparatus for internal combustion engine
Hiroshi Oyagi, Kyoto (JP); Hirokazu Ito, Shizuoka-ken (JP); and Kazuhiko Seguchi, Shizuoka-ken (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Nov. 29, 2024, as Appl. No. 18/963,771.
Claims priority of application No. 2024-005160 (JP), filed on Jan. 17, 2024.
Int. Cl. F01N 3/28 (2006.01); F01N 13/10 (2010.01)
CPC F01N 3/2892 (2013.01) [F01N 13/10 (2013.01); F01N 2240/20 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An exhaust purifying apparatus for an internal combustion engine, comprising:
an exhaust manifold;
a cylindrical catalytic converter; and
a cylindrical connection portion that connects the catalytic converter to the exhaust manifold, wherein
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 a same central axis as the catalytic converter,
the connection portion includes a constriction at a part connected to the catalytic converter, the constriction being a part at which an inner wall of the connection portion bulges inward,
a part of the connection portion on an upstream side of the constriction defines a collision diffusion chamber,
the collision diffusion chamber is configured to cause exhaust gas flowing from the exhaust manifold to collide with an inner wall of the collision diffusion chamber, diffuse the exhaust gas, and guide the diffused exhaust gas to the catalytic converter,
a cross-sectional flow area of the connection portion orthogonal to the central axis is smaller in the constriction than in the collision diffusion chamber, and
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.