CN109281733B - Catalytic converter and method for manufacturing housing - Google Patents
Catalytic converter and method for manufacturing housing Download PDFInfo
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- CN109281733B CN109281733B CN201810724537.0A CN201810724537A CN109281733B CN 109281733 B CN109281733 B CN 109281733B CN 201810724537 A CN201810724537 A CN 201810724537A CN 109281733 B CN109281733 B CN 109281733B
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- reduced diameter
- portions
- flat
- catalytic converter
- cylindrical portion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Analytical Chemistry (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Exhaust Silencers (AREA)
Abstract
The present invention relates to a catalytic converter and a method for manufacturing a housing, the catalytic converter including a cylindrical housing having at least a pair of retainer cylinder portions and a reduced diameter cylinder portion integrally connecting the retainer cylinder portions, and a monolithic catalyst carrier housed in the retainer cylinder portions individually; a part corresponding to the space between the holding cylinder parts in the cylindrical shell material corresponding to the holding cylinder parts is formed into the diameter-reduced cylinder part by compression molding; in this catalytic converter, the press load at the time of press-molding the reduced diameter cylindrical portion is suppressed from being very uneven in the circumferential direction of the reduced diameter cylindrical portion. In the catalytic converter of the present invention, flat portions (18a) are formed in 2 or more locations spaced apart in the circumferential direction of a reduced diameter cylindrical portion (18), and sensors (23) are attached to at least 1 of these flat portions (18 a).
Description
Technical Field
The present invention relates to a catalytic converter including a cylindrical housing having at least a pair of retainer cylinder portions and a reduced diameter cylinder portion integrally connecting the retainer cylinder portions, and a monolithic catalyst carrier housed in the retainer cylinder portions individually; a cylindrical shell material corresponding to the retainer cylinder part, wherein a part corresponding to the space between the retainer cylinder parts is formed into the reduced diameter cylinder part by compression molding; the invention also relates to a method for manufacturing a housing.
Background
Such a catalytic converter is known, for example, in patent document 1 and patent document 2.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2004-92461
Patent document 2: japanese patent laid-open No. 2012 and 117443
Disclosure of Invention
Problems to be solved by the invention
In the catalytic converter disclosed in patent document 1, a single flat portion is provided in the reduced diameter cylindrical portion of the outer shell, and a mount for mounting the sensor to the flat portion is formed. Therefore, a pressing load in one direction for forming a single flat portion acts on the reduced diameter cylindrical portion, and both end portions of the outer shell may be deformed in the expanding direction by an unequal load in the circumferential direction of the reduced diameter cylindrical portion, and a complicated step is required for correcting this.
On the other hand, in the catalytic converter disclosed in patent document 2, the reduced diameter cylindrical portion is composed of 1 flat portion and 2 or more excellent arc portions connecting both end portions of the flat portion, and the occurrence of wrinkles is prevented by adjusting the circumferential length by the excellent arc portions, but there is a problem that the excellent arc portions are not easily formed and the adjustment is complicated, and furthermore, since a pressing load in one direction for forming a single flat portion acts on the reduced diameter cylindrical portion, a load which is not uniform in the circumferential direction thereof acts on the reduced diameter cylindrical portion, similarly to the catalytic converter disclosed in patent document 1.
The present invention has been made in view of such circumstances, and an object thereof is to provide a catalytic converter that can suppress a pressing load at the time of press-molding a reduced diameter cylindrical portion of a housing from being very uneven in a circumferential direction of the reduced diameter cylindrical portion; and a method for manufacturing a housing in which the housing can be appropriately manufactured.
Means for solving the problems
In order to achieve the above object, a first aspect of the present invention provides a catalytic converter including a cylindrical housing having at least a pair of retainer cylinder portions and a reduced diameter cylinder portion integrally connecting the retainer cylinder portions, and a monolithic catalyst carrier housed in the retainer cylinder portions individually; a cylindrical shell material corresponding to the retainer cylinder part, wherein a part corresponding to the space between the retainer cylinder parts is formed into the reduced diameter cylinder part by compression molding; wherein the diameter-reduced cylindrical portion has flat portions formed at 2 or more locations spaced apart in the circumferential direction, and the sensor is attached to at least 1 of the flat portions.
In addition to the configuration of the first aspect of the present invention, according to the second aspect of the present invention, the pair of flat portions is formed on the reduced diameter cylindrical portion so as to extend along a pair of virtual planes orthogonal to each other in addition to the configuration of the first aspect of the present invention 1.
In the invention according to claim 3, in addition to the configuration according to claim 1, the reduced diameter cylindrical portion has the flat portion formed at 2 or more locations spaced at equal intervals in a circumferential direction.
A 4 th aspect of the present invention is the structure according to any one of the 1 st to 3 rd aspects, wherein 1 st protruding strips that protrude in an outer direction of the reduced diameter cylindrical portion and extend in an axial direction of the reduced diameter cylindrical portion are formed at both end portions of the flat portion along a circumferential direction of the reduced diameter cylindrical portion.
A 5 th aspect of the present invention is the structure according to the 4 th aspect, wherein a 2 nd projecting strip projecting in an outward direction and extending in an axial direction of the reduced diameter cylindrical portion is formed on an outer surface of the reduced diameter cylindrical portion at a circumferential center portion between 2 or more of the flat portions.
A 6 th aspect of the present invention is the electric welded pipe of any one of the 1 st to 5 th aspects, wherein the housing material is an electric welded pipe having an electric welding portion disposed on one of 2 or more of the flat portions.
A 7 th aspect of the present invention is the electric welding tube according to the 5 th aspect, wherein the outer shell member is an electric welding tube having an electric welding portion disposed on one of 2 or more of the 2 nd projecting rods.
Further, according to a 8 th aspect of the present invention, there is provided a method for manufacturing a housing for a catalytic converter having any one of the configurations 1 to 7, wherein a portion of the cylindrical housing material corresponding to a space between the retainer cylinder portions is press-molded by 2 or more split molds including a split mold having a flat surface for forming the flat portion, the split mold being split in a circumferential direction of the housing material, so as to form the reduced diameter cylinder portion.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the first aspect of the present invention, since the flat portion is formed so that the pressing load acts on the housing material from a plurality of directions, the pressing load can be prevented from being greatly uneven in the circumferential direction of the reduced diameter cylindrical portion, and the amount of deformation per 1 position can be suppressed to be small.
Further, according to the 2 nd aspect of the present invention, since the pair of flat portions formed in the reduced diameter cylindrical portion are along the pair of virtual planes orthogonal to each other, the flat portions affect each other so that one flat portion suppresses deformation of the other flat portion, and the amount of deformation per 1 position can be suppressed to be small.
According to the third aspect of the present invention, since the flat portions are formed at 2 or more locations spaced at equal intervals in the circumferential direction of the reduced diameter cylinder portion, the flat portions are arranged in a balanced manner in the reduced diameter cylinder portion, and the adjacent flat portions are reinforced (reinforcing し and う) with each other, whereby the strength of the reduced diameter cylinder portion can be increased, the thickness of the outer shell material can be reduced, and the weight of the outer shell can be reduced.
According to the 4 th aspect of the present invention, since the 1 st projecting strips that project in the outer direction of the reduced diameter cylindrical portion and extend in the axial direction of the reduced diameter cylindrical portion are formed at both end portions of the flat portion, the 1 st projecting strips can absorb the amount of contraction of a part of the reduced diameter cylindrical portion in the radial direction by forming the flat portion, and can contribute to the strength enhancement of the flat portion.
According to the 5 th aspect of the present invention, since the 2 nd projecting strip is formed on the outer surface of the reduced diameter cylindrical portion at the circumferential direction central portion between the 2 or more flat portions, the difference in circumferential length between the reduced diameter cylindrical portion and the retaining cylindrical portion can be reduced, and the strength of the reduced diameter cylindrical portion can be further enhanced while suppressing the occurrence of wrinkles and the like in the reduced diameter cylindrical portion.
According to the feature 6 of the present invention, since the material of the case is the electric welded pipe and the electric welded portion is arranged in one of the 2 or more flat portions, the portion where the electric welded portion is arranged does not change in shape in the cross-sectional shape of the case, and the stress applied to the electric welded portion can be reduced as compared with a shape having undulations.
According to the 7 th aspect of the present invention, since the housing material is the electric welded pipe and the electric welded portion is arranged on one of the 2 nd or more projection bars, the deformation amount of the electric welded portion is small, and the load applied to the electric welded portion can be reduced.
Further, according to the 8 th aspect of the present invention, since the reduced diameter cylindrical portion is formed by 2 or more split dies (including a split die having a flat surface for forming the flat portion), the press load by 1 split die can be reduced, the amount of deformation can be suppressed to a small level, and the deformation of the reduced diameter cylindrical portion can be suppressed to form the outer shell.
Drawings
Fig. 1 is a longitudinal sectional view of a catalytic converter of embodiment 1.
Fig. 2 is a cross-sectional view taken along line 2-2 of fig. 1.
FIG. 3 is a cross-sectional view of the compression molding apparatus before compression molding.
FIG. 4 is a cross-sectional view of the press molding apparatus at the completion of press molding.
Fig. 5 is a cross-sectional view of the catalytic converter of embodiment 2.
Fig. 6 is a cross-sectional view of the catalytic converter of embodiment 3.
Fig. 7 is a sectional view of embodiment 4 corresponding to fig. 2.
Fig. 8 is a sectional view of embodiment 5 corresponding to fig. 5.
Fig. 9 is a sectional view of embodiment 6 corresponding to fig. 6.
Detailed Description
Embodiments of the present invention will be described below with reference to the attached drawings.
In describing embodiment 1 of the present invention with reference to fig. 1 to 4, first, in fig. 1, the catalytic converter is manufactured by housing 2 or more (for example, 2) monolithic catalyst carriers 12,13 each having an elastic mat 14,15 wound around the outer periphery thereof as a holding material in series with a space in a cylindrical (for example, cylindrical) housing 11A in the direction along the axis of the housing 11A.
The housing 11A is integrally formed with: at least a pair of (a pair of in the present embodiment) retainer tube portions 16, 17; a reduced diameter cylindrical portion 18 integrally connecting the retainer cylindrical portions 16, 17; and a pair of funnel-shaped connecting cylindrical portions 19,20 connected to the end portions of the pair of retainer cylindrical portions 16,17 on the opposite side to the diameter-reduced cylindrical portion 18.
The monolithic catalyst carriers 12,13 are fitted into and held by the cylindrical holder portions 16,17 via the elastic pads 14,15, respectively. One of the pair of connecting cylindrical portions 19,20 is connected to an upstream exhaust pipe 21 connected to an exhaust port (not shown) of the vehicle internal combustion engine, and the other connecting cylindrical portion 20 is connected to an exhaust muffler (not shown) via a downstream exhaust pipe 22.
The exhaust gas discharged from the internal combustion engine is introduced into the housing 11A from the upstream side exhaust pipe 21, passes through the pair of monolithic catalyst carriers 12 and 13 in this order, whereby harmful substances in the exhaust gas are purified by oxidation-reduction, and the purified exhaust gas is discharged into the atmosphere through the downstream side exhaust pipe 22 and the exhaust muffler.
At least 1 sensor (1O in the present embodiment) is attached to the reduced diameter cylindrical portion 18 of the housing 11A2Sensor 23), the O2The sensor 23 is for O in the exhaust gas between the pair of monolithic catalyst carriers 12,132Detecting the concentration, and detectingThe measurement signal is input to an electronic control unit not shown. After that, the electronic control unit is based on the control of the electronic control unit by O2O obtained by sensor 232The concentration is controlled with respect to the amount of fuel supplied to the internal combustion engine, thereby appropriately controlling the air-fuel ratio of the intake air-fuel mixture of the internal combustion engine.
The reduced diameter cylindrical portion 18 of the outer shell 11A is formed by press molding a portion corresponding to a space between the retainer cylindrical portions 16,17 in a cylindrical outer shell material 24 corresponding to the retainer cylindrical portions 16,17, the reduced diameter cylindrical portion 18 is formed with flat portions 18a at 2 or more locations spaced apart in a circumferential direction, and the O is attached to at least 1 (1 in the present embodiment) of the flat portions 18a2A sensor 23.
The flat portions 18a are formed at 2 or more (preferably 3 to 6) positions at equal intervals in the circumferential direction of the reduced diameter cylindrical portion 18, and in the present embodiment, the flat portions 18a are formed at 4 positions at equal intervals in the circumferential direction of the reduced diameter cylindrical portion 18.
The flat portion 18a is provided with the O2 A mounting hole 25 is formed in the flat portion 18a of the sensor 23, a sensor mounting boss 26 is fitted into the mounting hole 25, and the sensor mounting boss 26 is fixed to one of the flat portions 18a by welding. The sensor mounting boss 26 has a threaded hole 27, O2The sensor 23 is screwed into the threaded hole 27, O2The sensor 23 has a sensing portion 23a at the front end portion thereof disposed at the intermediate portion between the pair of monolithic catalyst carriers 12, 13.
Further, on both ends of the flat portion 18a along the circumferential direction of the reduced diameter cylindrical portion 18, 1 st projecting strips 18b are formed which project in the outer direction of the reduced diameter cylindrical portion 18 and extend in the axial direction of the reduced diameter cylindrical portion 18. Further, at the circumferential center portion between 2 or more of the flat portions 18a, a 2 nd projecting strip 18c projecting outward and extending in the axial direction of the reduced diameter cylindrical portion 18 is formed on the outer surface of the reduced diameter cylindrical portion 18.
In FIG. 3, the outer shell member 24 is formed of an electric welding pipe having an electric welding portion 28, the reduced diameter cylindrical portion 18 is formed by press molding a portion of the outer shell member 24 corresponding to the portion between the retainer cylindrical portions 16,17 with 2 or more split molds 29,30, the 2 or more split molds 29,30 are split in the circumferential direction of the housing material 24, and comprises a split die 29 having a flat surface 29a for forming the above-mentioned flat portion 18a, in this embodiment, 4 split molds 29 having the flat surface 29a and 4 split molds 30 corresponding to the portion of the reduced diameter cylinder portion 18 other than the flat portion 18a are disposed outside the shell member 24, and a core mold 31 having an outer peripheral shape corresponding to the inner peripheral shape of the reduced diameter cylinder portion 18 is fixedly disposed inside the shell member 24.
By press-molding the covering material 24 inward in the radial direction of the covering material 24 toward the core mold 31 by the 8 split molds 29 and 30, the reduced-diameter cylindrical portion 18 having 4 flat portions 18a is formed as shown in fig. 4. The electric-welding portion 28 of the housing member 24 is disposed on one of 2 or more of the 2 nd ridge 18 c.
Next, to explain the operation of embodiment 1, the housing 11A has a pair of retainer cylinder portions 16,17 for individually housing the monolithic catalyst carriers 12,13, respectively, and a reduced diameter cylinder portion 18 for integrally connecting the retainer cylinder portions 16,17, and the reduced diameter cylinder portion 18 is formed by press molding at a portion corresponding to a space between the retainer cylinder portions 16,17 in a cylindrical housing material 24 corresponding to the retainer cylinder portions 16,17, and flat portions 18a, O are formed in the reduced diameter cylinder portion 18 at 2 or more locations (for example, 4 locations) spaced apart from each other in the circumferential direction2By attaching the sensors 23 to at least 1 (1 in the present embodiment) of the flat portions 18a, a pressing load is applied to the shell member 24 from a plurality of directions (4 directions in the present embodiment) in order to form the flat portions 18a, so that the pressing load can be prevented from being greatly unequal in the circumferential direction of the reduced diameter cylindrical portion 18, and the amount of deformation per 1 position can be suppressed to be small.
Further, since the flat portions 18a are formed at 2 or more locations (4 locations in the present embodiment) spaced at equal intervals in the circumferential direction of the reduced diameter cylindrical portion 18, the flat portions 18a are evenly arranged on the reduced diameter cylindrical portion 18, and the adjacent flat portions 18a are along planes perpendicular to each other, so that one flat portion 18a of the adjacent flat portions 18a can be reinforced with each other so as to suppress deformation of the other flat portion 18a, thereby increasing the strength of the reduced diameter cylindrical portion 18, and reducing the thickness of the outer shell material 24 and the weight of the outer shell 11A.
Further, since the 1 st projecting ribs 18b that project outward of the reduced diameter cylindrical portion 18 and extend in the axial direction of the reduced diameter cylindrical portion 18 are formed at both ends of the flat portion 18a along the circumferential direction of the reduced diameter cylindrical portion 18, the 1 st projecting ribs 18b absorb an amount of contraction of a part of the reduced diameter cylindrical portion 18 in the radial direction by forming the flat portion 18a, and can contribute to strength enhancement of the flat portion 18 a.
Further, since the 2 nd projecting strips 18c that project outward and extend in the axial direction of the reduced diameter cylindrical portion 18 are formed on the outer surface of the reduced diameter cylindrical portion 18 in the circumferential direction central portion between 2 or more flat portions 18a, the difference in circumferential length of the reduced diameter cylindrical portion 18 with respect to the retaining cylindrical portions 16,17 can be reduced, the occurrence of wrinkles and the like in the reduced diameter cylindrical portion 18 can be suppressed, and the strength of the reduced diameter cylindrical portion 18 can be further enhanced.
Further, since the housing member 24 is an electric welding tube in which the electric welding portion 28 is disposed in one of 2 or more of the 2 nd protrusions 18c, the amount of deformation of the electric welding portion 28 can be reduced, and the burden imposed on the electric welding portion 28 can be reduced.
Further, since the reduced diameter cylinder portion 18 is formed by press-molding a portion of the cylindrical housing material 24 corresponding to the space between the retainer cylinder portions 16,17 with 2 or more split molds 29,30 (which include the split mold 29 having the flat surface 29a for forming the flat portion 18a and are split in the circumferential direction of the housing material 24), the press load due to 1 split mold 29,30 can be reduced, the amount of deformation can be suppressed to a small level, and the deformation of the reduced diameter cylinder portion 18 can be suppressed to form the housing 11A.
The reduced diameter cylindrical portion 32 of the housing 11B is formed by press molding at a portion corresponding to a space between the retainer cylindrical portions 16,17 in the cylindrical housing material 24 corresponding to the retainer cylindrical portions 16,17, and flat portions 32a are formed at 2 or more locations (3 locations in embodiment 2) at equal intervals in the circumferential direction of the reduced diameter cylindrical portion 32. O is2The sensor 23 is mounted on one of these flat portions 32 a.
Further, on both ends of the flat portion 32a along the circumferential direction of the reduced diameter cylindrical portion 32, 1 st projecting strips 32b are formed which project in the outer direction of the reduced diameter cylindrical portion 32 and extend in the axial direction of the reduced diameter cylindrical portion 32. Further, at the circumferential center portion between 2 or more (3 in embodiment 2) of the flat portions 32a, a 2 nd projecting strip 32c projecting in the outer direction and extending in the axial direction of the reduced diameter cylindrical portion 32 is formed on the outer surface of the reduced diameter cylindrical portion 32.
The same effects as those of the above-described embodiment 1 can be exhibited also in embodiment 2.
Embodiment 3 of the present invention will be described with reference to fig. 6, and portions corresponding to those in embodiments 1 and 2 are denoted by the same reference numerals, and detailed description thereof will be omitted.
The reduced diameter cylindrical portion 33 of the housing 11C is formed by press molding at a portion corresponding to a space between the retainer cylindrical portions 16,17 in the cylindrical housing material 24 corresponding to the retainer cylindrical portions 16,17, and flat portions 33a are formed at 2 or more locations (2 locations in embodiment 3) spaced apart from each other in the circumferential direction of the reduced diameter cylindrical portion 33.
The flat portions 33a are formed on the reduced diameter cylinder portion 33, O along a pair of virtual planes 34,35 orthogonal to each other2The sensor 23 is mounted on one of the two flat portions 33 a.
Further, on both end portions of the flat portion 33a along the circumferential direction of the reduced diameter cylindrical portion 33, 1 st projecting strips 33b projecting in the outer direction of the reduced diameter cylindrical portion 33 and extending in the axial direction of the reduced diameter cylindrical portion 33 are formed, on the outer surface of the reduced diameter cylindrical portion 33, 2 nd projecting strips 33c projecting in the outer direction and extending in the axial direction of the reduced diameter cylindrical portion 33 are formed in the circumferential direction central portion between 2 or more (2 in the 3 rd embodiment) of the flat portions 33 a.
According to embodiment 3, since the pair of flat portions 33a formed in the reduced diameter cylindrical portion 33 are along the pair of virtual planes 34 and 35 orthogonal to each other, one flat portion 33a affects each other so as to suppress deformation of the other flat portion 33a, and the amount of deformation per 1 position can be suppressed to be small.
Embodiment 4 of the present invention will be described with reference to fig. 7, and portions corresponding to those in embodiments 1 to 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.
The housing 11D of the catalytic converter integrally includes a pair of retainer cylinder portions 16,17 and a reduced diameter cylinder portion 18 integrally connecting the retainer cylinder portions 16,17, as in embodiment 1 shown in fig. 1 to 4, and the reduced diameter cylinder portion 18 is formed by press molding a portion corresponding to a space between the retainer cylinder portions 16,17 in a housing material 24 (see fig. 1) of an electric welding pipe having an electric welding portion 28.
The electric welding part 28 is arranged in 4 flat parts 18a of the reduced diameter cylinder part 18 except for the mounting part O2The molding of the cover material 24 is performed so as to be applied to one of 3 flat portions 18a other than the flat portion 18a of the sensor 23.
According to embodiment 4, in the cross-sectional shape of the housing 11D, the portion where the electric welding portion 28 is disposed has no shape change, and the stress applied to the electric welding portion 28 can be reduced as compared with a shape having undulations.
Embodiment 5 of the present invention will be described with reference to fig. 8, and portions corresponding to embodiments 1 to 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.
The housing 11E of this catalytic converter integrally includes a pair of retainer cylinder portions 16,17 and a reduced diameter cylinder portion 32 integrally connecting the retainer cylinder portions 16,17, as in embodiment 2 shown in fig. 5, and the reduced diameter cylinder portion 32 is formed by press molding a portion corresponding to a space between the retainer cylinder portions 16,17 in the housing material 24 (see fig. 1) of the electric welding pipe as the electric welding portion 28.
The electric welding part 28 is disposed on 3 flat parts 32a of the reduced diameter cylinder part 32 except for O2The molding of the cover material 24 is performed so as to be applied to one of the 2 flat portions 32a other than the flat portion 32a of the sensor 23.
According to embodiment 5, as in embodiment 4, the stress applied to the spot welded portions 28 can be reduced.
Embodiment 6 of the present invention will be described with reference to fig. 9, and portions corresponding to those in embodiments 1 to 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.
The housing 11F of this catalytic converter includes a pair of retainer cylinder portions 16,17 and a reduced diameter cylinder portion 33 integrally connecting the retainer cylinder portions 16,17, as in embodiment 3 shown in fig. 6, and the reduced diameter cylinder portion 33 is formed by press molding a portion corresponding to a space between the retainer cylinder portions 16,17 in a housing material 24 (see fig. 1) of an electric welding pipe having an electric welding portion 28.
The electric welding part 28 is disposed on the pair of flat parts 33a of the reduced diameter cylinder part 33 except for the installation of O2The molding of the cover material 24 is performed so that the sensor 23 is placed on 1 flat portion 33a other than the flat portion 33 a.
According to embodiment 6 as well, the stress applied to the spot welded portions 28 can be reduced as in embodiments 4 and 5.
The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, and various design changes may be made without departing from the present invention described in the claims.
Description of the symbols
11A,11B,11C,11D,11E, 11F. outer shell
12, 13. monolithic catalyst support
16, 17. retaining cylinder part
18,32, 33. diameter reducing cylinder part
18a,32a,33a flat
18b,32b,33b,1 st ridge
18c,32c,33c, 2 nd protrusion
23. O2 sensor as sensor
28. electric welding part
29, 30. dividing mould
29 a. plane
34, 35. imaginary plane
Claims (7)
1. A catalytic converter is provided with:
a cylindrical housing (11A,11B,11C,11D,11E,11F), the cylindrical housing (11A,11B,11C,11D,11E,11F) having at least a pair of retaining cylinder portions (16,17) and a reduced diameter cylinder portion (18,32,33) integrally connecting the retaining cylinder portions (16, 17); and the number of the first and second groups,
monolithic catalyst carriers (12,13), the monolithic catalyst carriers (12,13) being individually housed in the retainer cylinder portions (16, 17);
forming the reduced diameter cylinder portion (18,32,33) by press molding at a portion corresponding to the space between the retainer cylinder portions (16,17) in a cylindrical housing material (24) corresponding to the retainer cylinder portions (16, 17);
the catalytic converter is characterized in that flat parts (18a,32a,33a) are formed at more than 2 positions spaced at intervals in the circumferential direction of the diameter-reducing cylinder part (18,32,33), a sensor (23) is mounted on at least one of the flat parts (18a,32a,33a),
first projecting strips (18b,32b,33b) projecting in the outer direction of the reduced diameter cylindrical portion (18,32,33) and extending in the axial direction of the reduced diameter cylindrical portion (18,32,33) are formed at both ends of the flat portion (18a,32a,33a) in the circumferential direction of the reduced diameter cylindrical portion (18,32, 33).
2. The catalytic converter according to claim 1, wherein the pair of flat portions (33a) are formed in the reduced diameter cylinder portion (33) so as to follow a pair of imaginary planes (34,35) orthogonal to each other.
3. The catalytic converter according to claim 1, wherein the reduced diameter cylindrical portion (18,32) is formed with the flat portions (18a,32a) at 2 or more locations at equal intervals in a circumferential direction.
4. The catalytic converter according to claim 1, wherein 2 or more of the flat portions (18a,32a,33a) are formed with 2 nd protrusions (18c,32c,33c) protruding in an outer direction and extending in an axial direction of the reduced diameter cylindrical portion (18,32,33) on an outer surface of the reduced diameter cylindrical portion (18,32,33) at a circumferential center portion between the flat portions (18a,32a,33 a).
5. A catalytic converter according to any of claims 1-3, characterized in that the casing material (24) is an electric welded tube with an electric welded portion (28) on one of 2 or more of the flat portions (18a,32a,33 a).
6. A catalytic converter according to claim 4, characterized in that the casing material (24) is an electric welded tube provided with an electric welding portion (28) on one of 2 or more of the 2 nd protrusions (18c,32c,33 c).
7. A method of manufacturing a housing for use in manufacturing the housing (11A to 11F) in the catalytic converter according to any one of claims 1 to 3, characterized in that the reduced diameter cylindrical portion (18,32,33) is formed by press-molding a portion of the cylindrical housing material (24) corresponding to a space between the holding cylindrical portions (16,17) by 2 or more split molds (29,30), the 2 or more split molds (29,30) being split in a circumferential direction of the housing material (24) and including a split mold (29) having a flat surface (29a) for forming the flat portion (18a,32a,33 a).
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-141797 | 2017-07-21 | ||
| JP2017141797 | 2017-07-21 | ||
| JP2017-223388 | 2017-11-21 | ||
| JP2017223388A JP6458122B1 (en) | 2017-07-21 | 2017-11-21 | Catalytic converter and casing manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109281733A CN109281733A (en) | 2019-01-29 |
| CN109281733B true CN109281733B (en) | 2021-05-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810724537.0A Active CN109281733B (en) | 2017-07-21 | 2018-07-04 | Catalytic converter and method for manufacturing housing |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6458122B1 (en) |
| CN (1) | CN109281733B (en) |
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| CN102606262A (en) * | 2011-01-20 | 2012-07-25 | 揖斐电株式会社 | Holding sealing material, exhaust gas purifying apparatus, and method for manufacturing exhaust gas purifying apparatus |
| JP2012193726A (en) * | 2011-03-18 | 2012-10-11 | Toyota Motor Corp | Catalyst converter device |
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| JP2000073755A (en) * | 1998-08-26 | 2000-03-07 | Honda Motor Co Ltd | O2 sensor installing structure of catalyst converter |
| JP4427177B2 (en) * | 2000-09-26 | 2010-03-03 | 東京濾器株式会社 | Diameter reduction processing apparatus and diameter reduction processing method |
| US7897117B2 (en) * | 2006-12-01 | 2011-03-01 | Tenneco Automotive Operating Company Inc. | Catalytic converter with mounting device for a hot exhaust gas oxygen sensor |
| JP5107006B2 (en) * | 2007-11-28 | 2012-12-26 | 三恵技研工業株式会社 | Method for manufacturing catalytic converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004092461A (en) * | 2002-08-30 | 2004-03-25 | Yutaka Giken Co Ltd | Catalytic converter and manufacturing method thereof |
| CN102112713A (en) * | 2008-08-04 | 2011-06-29 | 本田技研工业株式会社 | Exhaust gas purifying device |
| CN101907011A (en) * | 2009-03-11 | 2010-12-08 | 本田技研工业株式会社 | Catalyst holding structure |
| JP2011185115A (en) * | 2010-03-05 | 2011-09-22 | Sankei Giken Kogyo Co Ltd | Method of manufacturing cleaning device for automobile |
| JP2012117443A (en) * | 2010-11-30 | 2012-06-21 | Yutaka Giken Co Ltd | Catalyst converter |
| CN102606262A (en) * | 2011-01-20 | 2012-07-25 | 揖斐电株式会社 | Holding sealing material, exhaust gas purifying apparatus, and method for manufacturing exhaust gas purifying apparatus |
| JP2012193726A (en) * | 2011-03-18 | 2012-10-11 | Toyota Motor Corp | Catalyst converter device |
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| JP6458122B1 (en) | 2019-01-23 |
| JP2019023455A (en) | 2019-02-14 |
| CN109281733A (en) | 2019-01-29 |
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