Catalytic converter and method for manufacturing casing

Patent metadata

Field	Value
Publication number	US-10494973-B2
Application number	US-201816023551-A
Country	US
Kind code	B2
Filing date	Jun 29, 2018
Priority date	Jul 21, 2017
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

A catalytic converter includes: a tubular casing including at least a pair of holding tubular parts and a reduced diameter tubular part that integrally connects the holding tubular parts to each other; and a monolithic catalyst carrier accommodated in each of the holding tubular parts, the reduced diameter tubular part being obtained by press-forming a portion, between the holding tubular parts, of a casing material of a tubular shape that corresponds to that of the holding tubular parts. Flat parts are formed respectively in a plurality of places at intervals in a peripheral direction of the reduced diameter tubular part, a sensor being attached to at least one of the flat parts. Accordingly, a press load when press-forming the reduced diameter tubular part is suppressed from becoming large and unequal in the peripheral direction of the reduced diameter tubular part.

First claim

What is claimed is:

1. A catalytic converter comprising:
a tubular casing including at least a pair of holding tubular parts and a reduced diameter tubular part that integrally connects the holding tubular parts to each other; and
a monolithic catalyst carrier accommodated in each of the holding tubular parts,
the reduced diameter tubular part being obtained by press-forming a portion, between the holding tubular parts, of a casing material of a tubular shape that corresponds to that of the holding tubular parts,
wherein flat parts are formed respectively in a plurality of places at intervals in a peripheral direction of the reduced diameter tubular part, a sensor being attached to at least one of the flat parts, and wherein a pair of the flat parts are formed in the reduced diameter tubular part so as to extend along a pair of imaginary planes orthogonal to each other.

2. A catalytic converter comprising:
a tubular casing including at least a pair of holding tubular parts and a reduced diameter tubular part that integrally connects the holding tubular parts to each other; and
a monolithic catalyst carrier accommodated in each of the holding tubular parts, the reduced diameter tubular part being obtained by press-forming a portion, between the holding tubular parts, of a casing material of a tubular shape that corresponds to that of the holding tubular parts,
wherein flat parts are formed respectively in a plurality of places at intervals in a peripheral direction of the reduced diameter tubular part, a sensor being attached to at least one of the flat parts,
and wherein the flat parts are formed respectively in a plurality of places at equal intervals in the peripheral direction of the reduced diameter tubular part.

3. A catalytic converter comprising:
a tubular casing including at least a pair of holding tubular parts and a reduced diameter tubular part that integrally connects the holding tubular parts to each other; and
a monolithic catalyst carrier accommodated in each of the holding tubular parts, the reduced diameter tubular part being obtained by press-forming a portion, between the holding tubular parts, of a casing material of a tubular shape that corresponds to that of the holding tubular parts,
wherein flat parts are formed respectively in a plurality of places at intervals in a peripheral direction of the reduced diameter tubular part, a sensor being attached to at least one of the flat parts,
and wherein first protrusions are respectively formed on opposite end portions, along the peripheral direction of the reduced diameter tubular part, of each of the flat parts, the first protrusions protruding outward on the reduced diameter tubular part and extending in an axial direction of the reduced diameter tubular part.

4. The catalytic converter according to claim 1 , wherein first protrusions are respectively formed on opposite end portions, along the peripheral direction of the reduced diameter tubular part, of each of the flat parts, the first protrusions protruding outward on the reduced diameter tubular part and extending in an axial direction of the reduced diameter tubular part.

5. The catalytic converter according to claim 2 , wherein first protrusions are respectively formed on opposite end portions, along the peripheral direction of the reduced diameter tubular part, of each of the flat parts, the first protrusions protruding outward on the reduced diameter tubular part and extending in an axial direction of the reduced diameter tubular part.

6. The catalytic converter according to claim 3 , wherein second protrusions are formed on an outer surface of the reduced diameter tubular part at a central portion in the peripheral direction between adjacent ones of the plurality of flat parts, the second protrusions protruding outward on the reduced diameter tubular part and extending in the axial direction of the reduced diameter tubular part.

7. The catalytic converter according to claim 1 , wherein the tubular casing is an electric resistance welded tube which has an electric resistance welded part disposed in one of the plurality of flat parts.

8. The catalytic converter according to claim 2 , wherein the tubular casing is an electric resistance welded tube which has an electric resistance welded part disposed in one of the plurality of flat parts.

9. The catalytic converter according to claim 6 , wherein the tubular casing is an electric resistance welded tube which has an electric resistance welded part disposed in one of the plurality of second protrusions.

10. The catalytic converter according to claim 1 , wherein the tubular casing is a product of a process comprising press-forming said portion, between the holding tubular parts, of a tubular casing material using a plurality of split molds that are divided in a peripheral direction of the tubular casing material and include split molds each having a flat surface for forming the flat part.

11. The catalytic converter according to claim 3 , wherein the tubular casing is a product of a process comprising press-forming said portion, between the holding tubular parts, of a tubular casing material using a plurality of split molds that are divided in a peripheral direction of the tubular casing material and include split molds each having a flat surface for forming the flat part.

12. The catalytic converter according to claim 2 , wherein the tubular casing is a product of a process comprising press-forming said portion, between the holding tubular parts, of a tubular casing material using a plurality of split molds that are divided in a peripheral direction of the tubular casing material and include split molds each having a flat surface for forming the flat part.

Assignees

• Yutaka Giken Co Ltd
• Honda Motor Co Ltd

Inventors

• Takayanagi Jun
• Ooka Toshihiro
• Yamamoto Noritaka
• Ishii Kazumasa
• Hatakeyama Yoshiaki

Classifications

• F01N2450/20

  by mechanical joints, e.g. by deforming housing, tube, baffle plate or parts thereof · CPC title

• F01N2450/22

  by welding or brazing · CPC title

• F01N13/0093

  the purifying devices are of the same type · CPC title

• F01N13/1872

  the assembly using stamp-formed parts or otherwise deformed sheet-metal · CPC title

• B21D53/88

  other parts for vehicles, e.g. cowlings, mudguards · CPC title