US 9,039,981 B2Granted

Exhaust gas purification apparatus of an internal combustion engine

AssigneeToyota Jidosha Kabushiki Kaisha

InventorMamoru Yoshioka

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Abstract

A laminated body composed of a holding member and an inner cylinder is arranged between a heat generation element, which is electrically energized to generate heat, and a case which covers the heat generation element, and the inner cylinder has an upstream side end portion extended to a more upstream side than an upstream side end face of said heat generation element and an upstream side end face of said holding member to form an extension portion, which is formed with a protruding portion protruding to an inner side in a diametrical direction. A flow of an exhaust gas, which flows backwards after colliding with the heat generation element, will be obstructed by said protruding portion. As a result, the backflow exhaust gas stops flowing into a gap between the case and the inner cylinder.

Claims19

Dependent claims

An exhaust gas purification apparatus of an internal combustion engine comprising:

a heat generation element that is electrically energized to generate heat;
a case that is a cylindrical member having an inside diameter larger than an outside diameter of said heat generation element, and covers said heat generation element;
an inner cylinder that is a cylindrical insulating body having an inside diameter larger than the outside diameter of said heat generation element and at the same time an outside diameter smaller than the inside diameter of said case, and is arranged between said heat generation element and said case;
a first holding member that is a cylindrical insulating body arranged between said case and said inner cylinder, and holds said inner cylinder;
a second holding member that is a cylindrical insulating body arranged between said heat generation element and said inner cylinder, and holds said heat generation element;
an extension portion that is formed by extending an upstream side end portion of said inner cylinder to a more upstream side than an upstream side end face of said first holding member and an upstream side end face of said second holding member;
and
a protruding portion that is formed on said extension portion and protrudes to a diametrically inner side of said inner cylinder.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/499,802Filed 10 Mar 2011
Published: US 2013/0336847 A119 Dec 2013
Granted: 26 May 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

B01D 53/94
Of engine exhaust gases: by catalytic processes
F01N 3/2013
Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating: using electric or magnetic heating means
F01N 3/2026
Using electric or magnetic heating means: directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst…
F01N 3/28
Characterised by constructional aspects of converting apparatus: construction of catalytic reactors

Family

US 2013/0336847 A1Pre-grant publication · published 19 Dec 2013
US 9,039,981 B2This patent

From the US filing history. Foreign family members aren’t listed.

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