Engine exhaust device

Patent metadata

Field	Value
Publication number	US-2020032685-A1
Application number	US-201716337265-A
Country	US
Kind code	A1
Filing date	Dec 1, 2017
Priority date	Dec 16, 2016
Publication date	Jan 30, 2020
Grant date	—

Abstract

An engine exhaust device includes: a first catalyst; a second catalyst; a connection member and an exhaust gas outlet pipe. The first catalyst has a downstream end face and the second catalyst has an upstream end face. The downstream end face and the upstream end face form a predetermined dihedral angle. The upstream end face of the second catalyst and a side surface of the first catalyst closely face each other to form an overlap. A center axis of the exhaust gas outlet pipe is offset further toward the first catalyst than a center axis of the second catalyst is.

First claim

1 . An engine exhaust device, comprising:
a first catalyst disposed in an exhaust passage of an engine, and purifying exhaust gas discharged from the engine; a second catalyst disposed downstream of the first catalyst in a direction of a flow of the exhaust gas, and purifying the exhaust gas that has passed through the first catalyst; a connection member having a tubular shape, forming a part of the exhaust passage, and connecting the first catalyst and the second catalyst together and an exhaust gas outlet pipe disposed downstream of the second catalyst in the direction of the flow of the exhaust gas, and allowing the exhaust gas that has passed through the second catalyst to flow toward a downstream area of the exhaust passage, wherein the first catalyst has a downstream end face and the second catalyst has an upstream end face, the downstream end face and the upstream end face forming a predetermined dihedral angle, the upstream end face of the second catalyst and a side surface of the first catalyst closely face each other to form an overlap, and a center axis of the exhaust gas outlet pipe is offset further toward the first catalyst than a center axis of the second catalyst is.

2 . The engine exhaust device of claim 1 , wherein
the downstream end face of the second catalyst is provided with an EGR outlet, and the EGR outlet is disposed away from the exhaust gas outlet pipe.

3 . The engine exhaust device of claim 1 , wherein
the exhaust gas outlet pipe has a side surface closer to the first catalyst, the second catalyst has a side surface closer to the first catalyst, and the side surface of the exhaust gas outlet pipe is located closer to the first catalyst than the side surface of the second catalyst is.

4 . The engine exhaust device of claim 1 , wherein
the exhaust gas outlet pipe is disposed below a plane including the center axis of the second catalyst and parallel to the center axis of the first catalyst.

5 . The engine exhaust device of claim 1 , wherein
the predetermined dihedral angle is 60° or more and 120° or less.

6 . The engine exhaust device of claim 2 , wherein
the exhaust gas outlet pipe has a side surface closer to the first catalyst, the second catalyst has a side surface closer to the first catalyst, and the side surface of the exhaust gas outlet pipe is located closer to the first catalyst than the side surface of the second catalyst is.

7 . The engine exhaust device of claim 2 , wherein
the exhaust gas outlet pipe is disposed below a plane including the center axis of the second catalyst and parallel to the center axis of the first catalyst.

8 . The engine exhaust device of claim 3 , wherein
the exhaust gas outlet pipe is disposed below a plane including the center axis of the second catalyst and parallel to the center axis of the first catalyst.

9 . The engine exhaust device of claim 6 , wherein
the exhaust gas outlet pipe is disposed below a plane including the center axis of the second catalyst and parallel to the center axis of the first catalyst.

10 . The engine exhaust device of claim 2 , wherein
the predetermined dihedral angle is 60° or more and 120° or less.

11 . The engine exhaust device of claim 3 , wherein
the predetermined dihedral angle is 60° or more and 120° or less.

12 . The engine exhaust device of claim 4 , wherein
the predetermined dihedral angle is 60° or more and 120° or less.

13 . The engine exhaust device of claim 6 , wherein
the predetermined dihedral angle is 60° or more and 120° or less.

14 . The engine exhaust device of claim 7 , wherein
the predetermined dihedral angle is 60° or more and 120° or less.

15 . The engine exhaust device of claim 8 , wherein
the predetermined dihedral angle is 60° or more and 120° or less.

16 . The engine exhaust device of claim 9 , wherein
the predetermined dihedral angle is 60° or more and 120° or less.

Assignees

• Mazda Motor

Inventors

• Kuramashi Taku
• Kitabatake Keishi
• Takamure Tamotsu
• Kamo Toshiaki

Classifications

• F01N13/0093 Primary

  the purifying devices are of the same type · CPC title

• F01N3/101

  Three-way catalysts · CPC title

• F02M26/15

  in relation to engine exhaust purifying apparatus · CPC title

• F01N2470/18

  the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus · CPC title

• F02M26/00

  Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems · CPC title