Exhaust device of engine

Patent metadata

Field	Value
Publication number	US-2018258886-A1
Application number	US-201815905467-A
Country	US
Kind code	A1
Filing date	Feb 26, 2018
Priority date	Mar 10, 2017
Publication date	Sep 13, 2018
Grant date	—

Abstract

An exhaust-gas discharge port to discharge a main flow of exhaust gas passing through an exhaust-gas purifying device is provided at a position which is offset, on one side, from a center axis of the purifying-device body, and an EGR-gas takeout port is provided at a position which is offset, on an opposite side to the exhaust-gas discharge port, from the center axis of the purifying-device body.

First claim

What is claimed is:

1 . An exhaust device of an engine, comprising:
an exhaust-gas purifying device provided on an exhaust path of the engine and comprising a purifying-device body to purify exhaust gas discharged from the engine which is housed in a case thereof; and an EGR device connected to a downstream side, in an exhaust-gas flow direction, of the exhaust-gas purifying device and recirculating a part of the exhaust gas passing through the purifying-device body as EGR gas to an intake system of the engine, wherein an exhaust-gas discharge port is provided at a downstream-side end portion of said case of the exhaust-gas purifying device at a position which is offset from a center axis of the purifying-device body, an EGR-gas takeout port is provided at the downstream-side end portion of said case of the exhaust-gas purifying device at a position which is offset, on an opposite side to said exhaust-gas discharge port, from the center axis of the purifying-device body, and said EGR device is provided on the same side as said EGR-gas takeout port relative to the center axis of the purifying-device body.

2 . The exhaust device of the engine of claim 1 , wherein a downstream portion of an L-shaped exhaust pipe which is configured to be bent in a L shape is connected to an upstream side, in the exhaust-gas flow direction, of the exhaust-gas purifying device, and said EGR-gas takeout port is offset, on an outer-peripheral side of L-shaped bending of said L-shaped exhaust pipe, from the center axis of said purifying-device body.

3 . The exhaust device of the engine of claim 2 , further comprising an upstream-side exhaust-gas purifying device which is connected to an upstream portion of said L-shaped exhaust pipe, wherein a downstream portion of said upstream-side exhaust-gas purifying device is configured to overlap a portion of an upstream-side end face of said exhaust-gas purifying device, when viewed in an axial direction of the exhaust-gas purifying device.

4 . The exhaust device of the engine of claim 3 , wherein said exhaust-gas purifying device is provided inside an engine room of an automotive vehicle, said EGR-gas takeout port is provided below a center of said downstream-side end portion of the case of the exhaust-gas purifying device, and an EGR path of said EGR device is configured to extend upward from a base end side thereof which is connected to said EGR-gas takeout port to a tip side thereof which is connected to the intake system.

5 . The exhaust device of the engine of claim 4 , wherein a space portion which has a bottom portion positioned below said EGR-gas takeout port is formed inside said case at a position located on a downstream side of said purifying-device body.

6 . The exhaust device of the engine of claim 4 , further comprising a first support member which connects the case of said exhaust-gas purifying device and an EGR pipe constituting said EGR path and a second support member which supports a portion of the EGR pipe which is located between said EGR-gas takeout port and a connection portion where said first support member is connected.

7 . The exhaust device of the engine of claim 5 , further comprising a first support member which connects the case of said exhaust-gas purifying device and an EGR pipe constituting said EGR path and a second support member which supports a portion of the EGR pipe which is located between said EGR-gas takeout port and a connection portion where said first support member is connected.

8 . The exhaust device of the engine of claim 2 , wherein said engine is an in-line multi-cylinder engine, and said exhaust-gas purifying device is provided such that the center axis of said purifying-device body is substantially vertical to a cylinder row direction of the engine and is offset, on an arrangement side of said EGR device, from a center position, in the cylinder row direction, of the engine.

9 . The exhaust device of the engine of claim 3 , wherein said engine is an in-line multi-cylinder engine, and said exhaust-gas purifying device is provided such that the center axis of said purifying-device body is substantially vertical to a cylinder row direction of the engine and is offset, on an arrangement side of said EGR device, from a center position, in the cylinder row direction, of the engine.

10 . The exhaust device of the engine of claim 4 , wherein said engine is an in-line multi-cylinder engine, and said exhaust-gas purifying device is provided such that the center axis of said purifying-device body is substantially vertical to a cylinder row direction of the engine and is offset, on an arrangement side of said EGR device, from a center position, in the cylinder row direction, of the engine.

11 . The exhaust device of the engine of claim 5 , wherein said engine is an in-line multi-cylinder engine, and said exhaust-gas purifying device is provided such that the center axis of said purifying-device body is substantially vertical to a cylinder row direction of the engine and is offset, on an arrangement side of said EGR device, from a center position, in the cylinder row direction, of the engine.

12 . The exhaust device of the engine of claim 6 , wherein said engine is an in-line multi-cylinder engine, and said exhaust-gas purifying device is provided such that the center axis of said purifying-device body is substantially vertical to a cylinder row direction of the engine and is offset, on an arrangement side of said EGR device, from a center position, in the cylinder row direction, of the engine.

13 . The exhaust device of the engine of claim 7 , wherein said engine is an in-line multi-cylinder engine, and said exhaust-gas purifying device is provided such that the center axis of said purifying-device body is substantially vertical to a cylinder row direction of the engine and is offset, on an arrangement side of said EGR device, from a center position, in the cylinder row direction, of the engine.

Assignees

• Mazda Motor

Inventors

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

Classifications

• F01N13/08

  Other arrangements or adaptations of exhaust conduits {(pipes, joints or supports therefor in general F16L; collecting or removing exhaust gases of vehicle engines in workshops B08B15/00, on highways E01C1/005)} · CPC title

• F02B75/20

  with cylinders all in one line · CPC title

• F01N2470/18

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

• F02M26/15 Primary

  in relation to engine exhaust purifying apparatus · CPC title

• F01N3/021

  by means of filters · CPC title