WO2021230147A1 - Dispositif catalyseur d'échappement pour moteur à combustion interne - Google Patents

Dispositif catalyseur d'échappement pour moteur à combustion interne Download PDF

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Publication number
WO2021230147A1
WO2021230147A1 PCT/JP2021/017478 JP2021017478W WO2021230147A1 WO 2021230147 A1 WO2021230147 A1 WO 2021230147A1 JP 2021017478 W JP2021017478 W JP 2021017478W WO 2021230147 A1 WO2021230147 A1 WO 2021230147A1
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WO
WIPO (PCT)
Prior art keywords
catalyst device
exhaust
internal combustion
combustion engine
exhaust gas
Prior art date
Application number
PCT/JP2021/017478
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English (en)
Japanese (ja)
Inventor
良介 平松
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株式会社ユタカ技研
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Filing date
Publication date
Application filed by 株式会社ユタカ技研 filed Critical 株式会社ユタカ技研
Publication of WO2021230147A1 publication Critical patent/WO2021230147A1/fr

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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
    • 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
    • F01N3/18—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 methods of operation; Control
    • F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • 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

Definitions

  • the present invention relates to an exhaust catalyst device including a catalytic converter for purifying exhaust gas discharged from an exhaust port of an internal combustion engine.
  • the internal combustion engine that converts the heat energy generated by the combustion of the air-fuel mixture into kinetic energy is equipped with an exhaust catalyst device for purifying the exhaust gas discharged from the exhaust port.
  • This exhaust catalyst device includes a catalyst converter for purifying exhaust gas and a tubular introduction portion that guides the exhaust gas discharged from the exhaust port of the internal combustion engine to the inlet end face of the catalyst converter.
  • the catalytic converter efficiently fulfills the function of purifying the exhaust gas at a predetermined temperature or higher (for example, 500 ° C. or higher). Therefore, the temperature of the catalytic converter is low for a certain period of time immediately after the start of the internal combustion engine, and the purification efficiency of the exhaust gas by the catalytic converter is low. Therefore, in order to raise the temperature of the catalytic converter at an early stage, the catalytic converter is arranged close to the internal combustion engine side where the exhaust gas temperature is relatively high.
  • Patent Document 1 proposes an exhaust catalyst device in which the shape of the introduction portion is devised so that the exhaust gas flows from the collecting port of the internal combustion engine to the catalyst converter directly underneath as evenly as possible.
  • Patent Document 2 an introduction portion for guiding the exhaust gas to the catalytic converter is provided (inside) in order to make the distribution of the exhaust gas guided to the catalytic converter uniform without deteriorating the warm-up performance of the catalytic converter.
  • An exhaust catalyst device having an inner / outer double structure consisting of a tube) and an outer tube (outer tube) has been proposed.
  • the present invention has been made in view of the above problems, and an object thereof is to absorb the thermal expansion of the introduction portion even with an extremely high temperature exhaust gas to cause damage to the introduction portion and generation of abnormal noise. It is an object of the present invention to provide an exhaust catalyst device for an internal combustion engine capable of guiding the exhaust gas to a catalytic converter and purifying the exhaust gas while suppressing the exhaust gas.
  • the present invention comprises a catalytic converter for purifying exhaust gas and an exhaust catalyst having a tubular introduction portion that guides exhaust gas discharged from an exhaust port of an internal combustion engine to an inlet end surface of the catalytic converter.
  • the introduction portion is configured as an inner / outer double pipe structure of an inner and an outer, and the downstream side of the inner constitutes a thermal expansion allowable portion that does not come into contact with the catalytic converter and the outer. Is the first feature.
  • the inner and the outer are each composed of dissimilar metals, and the heat-resistant strength of the metal constituting the inner is the heat-resistant strength of the metal constituting the outer.
  • the second feature is that it is higher than.
  • the inner and the outer are configured by welding and integrating the press-molded products divided into two, respectively, and the inner and the upstream end of the outer are each other.
  • the third feature is that the joined cylindrical portion is formed, and the cylindrical portion is fitted into the circular hole of the mounting flange.
  • the fourth feature is that the thermal expansion allowance portion is arranged close to the outer.
  • a sensor penetrating the outer and the inner is attached to the outer, and the sensor and the through hole of the inner are attached to the outer.
  • the fifth feature is that a gap is formed between them so that they do not come into contact with each other.
  • a boss for attaching the sensor is attached to the outer, and the tubular portion of the boss extends to a position close to the inner. Is the sixth feature.
  • the seventh feature of the present invention is that a slide member is interposed in the gap between the thermal expansion allowable portion of the inner and the outer. do.
  • the introduction portion of the exhaust catalyst device is configured as an inner / outer double pipe structure of an inner and an outer, and the downstream side of the inner through which high-temperature exhaust gas flows is allowed to expand thermally. Since it constitutes a part and is free without being restricted by the catalytic converter and the outer, the inner can be freely thermally expanded. Therefore, even when the temperature of the exhaust gas is extremely high, it is possible to prevent damage and abnormal noise due to the difference in thermal expansion between the inner and outer parts.
  • the space between the inner and the outer forms a heat insulating layer to block the conduction of high-temperature exhaust gas heat to the outer, so that the temperature rise of the outer is suppressed.
  • the material of the metal constituting the inner and the outer can be selected to be the most suitable for the heating temperature of the inner and the outer.
  • the inner exposed to high-temperature exhaust gas is made of a metal with high heat resistance (for example, austenitic stainless steel), and the outer, which has a lower heating temperature than the inner, is made of ferritic stainless steel, which has excellent workability and strength. This enables a rational design of the introduction section.
  • the inner and the outer can be easily manufactured by welding and integrating the press-molded products divided into two.
  • the upstream end of the inner and the outer is configured as a cylindrical portion joined to each other, and the cylindrical portion is fitted into the circular hole of the mounting flange to make the mounting flange upstream of the inner and the outer (introduction portion). It can be easily attached to the side end portion, and by attaching this mounting flange to the exhaust side end surface of the cylinder head of the internal combustion engine, the exhaust catalyst device can be attached to the internal combustion engine.
  • the upstream end of the introduction portion can be accurately attached to the internal combustion engine by the mounting flange, the downstream end of the introduction portion can be accurately positioned with respect to the catalytic converter.
  • the thermal expansion allowable portion of the inner is arranged close to the outer, the gap between the inner and the outer is suppressed to a small size, and high-temperature exhaust gas enters this gap. It becomes difficult to prevent the temperature of the outer from becoming locally high due to the exhaust gas.
  • the outer has a sensor penetrating the outer and the inner (for example, a rough sensor for detecting a continuous change in the air-fuel ratio (A / F) of the air-fuel mixture). Since the sensor is attached and a gap is formed between the sensor and the through hole of the inner so that the two do not come into contact with each other, the sensor detects the oxygen concentration in the exhaust gas with high accuracy.
  • a sensor penetrating the outer and the inner for example, a rough sensor for detecting a continuous change in the air-fuel ratio (A / F) of the air-fuel mixture. Since the sensor is attached and a gap is formed between the sensor and the through hole of the inner so that the two do not come into contact with each other, the sensor detects the oxygen concentration in the exhaust gas with high accuracy.
  • the tubular portion of the boss formed on the outer extends to a position close to the inner, the gap between the sensor and the inner is suppressed to a small size, and the exhaust gas flowing in the inner is suppressed.
  • the inflow to the outer is effectively suppressed. Therefore, the local temperature rise of the outer due to the exhaust gas can be prevented.
  • the downstream end portion of the inner is supported by the slide member interposed in the gap between the thermal expansion allowable portion of the inner and the outer, so that the inner runout is ensured. It can be prevented. Further, since the gap between the inner and the outer is filled by the slide member, the inflow of the exhaust gas from the downstream end side of the inner to the outer is blocked, and the local temperature rise of the outer due to the exhaust gas is prevented. ..
  • FIG. 1 is a side view of a main part of an internal combustion engine including an exhaust catalyst device according to the present invention.
  • FIG. 2 is a vertical sectional view of an introduction portion of the exhaust catalyst device according to the present invention.
  • FIG. 3 is an exploded perspective view of the introduction portion of the exhaust catalyst device according to the present invention.
  • FIG. 4 is a vertical sectional view of an introduction portion according to another embodiment 1 of the exhaust catalyst device according to the present invention.
  • FIG. 5 is a vertical sectional view of an introduction portion according to another embodiment 2 of the exhaust catalyst device according to the present invention.
  • FIG. 1 is a side view of a main part of an internal combustion engine including an exhaust catalyst device according to the present invention
  • FIG. 2 is a vertical sectional view of an introduction part of the exhaust catalyst device according to the present invention
  • FIG. 3 is an exploded view of the introduction part of the exhaust catalyst device. It is a perspective view.
  • the internal combustion engine 10 shown in FIG. 1 is a 4-cycle multi-cylinder engine, and a plurality of cylinders (not shown) are arranged side by side in the cylinder block 11 in the direction perpendicular to the paper surface of FIG.
  • a piston (not shown) is fitted so that it can slide up and down.
  • Each piston is connected to a crankshaft (not shown) via a connecting rod (not shown).
  • a cylinder head 12 is attached to the upper part of the cylinder block 11, and a combustion chamber (not shown) is formed in the cylinder head 12 for each cylinder, and each combustion chamber is not shown.
  • the intake port and the exhaust port are open respectively.
  • the intake port and the exhaust port that open in each combustion chamber are opened and closed at appropriate timings by the intake valve and the exhaust valve (not shown) driven by a valve drive mechanism (not shown), which is required in each combustion chamber. Gas exchange is done.
  • a plurality of exhaust ports extending from the combustion chambers of each cylinder are gathered as a collecting port, and a plurality of exhaust ports are discharged from each combustion chamber on the end face of the cylinder head 12 on the exhaust side.
  • the exhaust gas catalyst device 1 for purifying the exhaust gas that collects and flows from the to the collecting port is connected.
  • an ignition (not shown) is performed after the air-fuel mixture is compressed by a piston in each combustion chamber. It is ignited and burned by the plug, and each piston slides in each cylinder by the pressure of the exhaust gas generated by the combustion of this air-fuel mixture. Then, the sliding (linear motion) of each piston is converted into the rotary motion of the crank shaft via the conrod, and when the exhaust port is opened by the exhaust valve in each combustion chamber, the high temperature and high pressure exhaust gas is described above.
  • the exhaust gas is discharged from each combustion chamber, aggregates and flows from a plurality of exhaust ports to the collecting port, and the exhaust gas is purified by the exhaust catalyst device 1 according to the present invention.
  • the exhaust gas purified by passing through the catalyst converter 2 of the exhaust catalyst device 1 is discharged into the atmosphere from the lead-out unit 5 of the exhaust catalyst device 1 through an exhaust pipe and a silencer (not shown).
  • the exhaust gas purification device 1 is connected to a catalyst converter 2 for purifying exhaust gas, a case 3 accommodating the catalyst converter 2, and an exhaust side end surface of a cylinder head 12 of an internal combustion engine 10 and discharged from an exhaust port.
  • the exhaust gas that is connected to the inlet end surface 2a of the catalyst converter 2 and the exhaust gas that is connected to the outlet end surface 2b of the catalyst converter 2 and purified by the catalyst converter 2 is sent to an exhaust pipe or silencer (not shown). It is composed of a derivation unit 5 for guiding.
  • the catalyst converter 2 is configured by supporting a precious metal such as platinum or rhodium on a columnar catalyst carrier having a monolithic structure in which a large number of cells are formed, and is housed in a case 3 in a substantially vertically upright state. Has been done.
  • the catalyst converter 2 is provided with an inlet end surface 2a into which the exhaust gas flows in from the introduction unit 4 and an outlet end surface 2b from which the exhaust gas purified by the catalyst converter 2 flows out.
  • the downstream end (lower end) of 4 is connected, and the upstream end (upper end) of the lead-out portion 5 is connected to the outlet end surface 2b.
  • the introduction portion 4 is a cylindrical member whose upstream end is attached to the exhaust side end surface of the internal combustion engine 10 via the attachment flange 6.
  • the introduction portion 4 extends substantially horizontally from its upstream end toward the rear (to the right in FIG. 1) and then bends vertically downward, and the downstream end extends horizontally to the catalytic converter 2. It is connected to the inlet end surface 2a of the catalyst converter 2.
  • the introduction portion 4 is configured as an inner / outer double pipe structure of an inner (inner pipe) 41 and an outer (outer pipe) 42, and is located between the inner 41 and the outer 42.
  • a space S is formed in the space S, which constitutes a heat insulating space having a low thermal conductivity.
  • the downstream side of the inner 41 constitutes a thermal expansion allowable portion 41a that does not come into contact with the catalyst converter 2 and the outer 42, and the thermal expansion allowable portion 41a is arranged close to the outer 42.
  • the thermal expansion allowable portion 41a of the inner 41 is not constrained by the catalytic converter 2 and the outer 42, and is in a free state with respect to both.
  • the outer circumference 42 is fixed by fitting the inner circumference of its downstream end (lower end) to the outer circumference of the case 3.
  • circular through holes 41b and 42a communicating with each other are formed in the upper portions of the inner 41 and the outer 42 of the introduction portion 4, respectively, and are around the through holes 42a of the outer 42.
  • a cylindrical boss 7 is attached to the boss 7 by welding.
  • a rough sensor 8 is passed through the through hole 41b of the boss 7 and the inner 41 from above, and the rough sensor 8 is attached to the boss 7. That is, the rough sensor 8 is attached to the outer 42 via the boss 7, and when the rough sensor 8 is attached, the rough sensor 8 and the through hole 41b of the inner 41 do not come into contact with each other.
  • a sized gap ⁇ is formed.
  • the rough sensor 8 is for detecting a change in the air-fuel ratio (A / F) of the air-fuel mixture, and the oxygen concentration in the exhaust gas detected by the rough sensor 8 is fed back to the air-fuel ratio of the air-fuel mixture. (A / F) is kept at the expected value.
  • the inner 41 and the outer 42 constituting the introduction portion 4 of the exhaust catalyst device 1 are the inner semifield 41A, which is a press-molded product divided into two, as shown in FIG.
  • the 41Bs and the outer semifields 42A and 42B are welded and integrated, and the upstream end portions of the inner 41 and the outer 42 are joined to each other by the cylindrical portion 41c as shown in FIG. , 42b, respectively.
  • the cylindrical portions 41c and 42b of the inner 41 and the outer 42 are fitted into the circular holes 6a of the mounting flange 6.
  • the mounting flange 6 is mounted at the upstream end of the introduction portion 4, and the upstream end of the introduction portion 4 uses a bolt or band (not shown) to attach the mounting flange 6 to the exhaust side end surface of the cylinder head 12 of the internal combustion engine 10.
  • a bolt or band (not shown) to attach the mounting flange 6 to the exhaust side end surface of the cylinder head 12 of the internal combustion engine 10.
  • the inner 41 and the outer 42 constituting the introduction portion 4 are made of dissimilar metals, and the inner 41 in which the high-temperature exhaust gas flows inside is more than the metal constituting the outer 42 having a lower temperature than the inner 41.
  • austenitic stainless steel (SUS316L) having high heat resistance and corrosion resistance is used as the metal constituting the inner 41
  • ferritic stainless steel having excellent workability and strength is used as the metal constituting the outer 42. (SUS444, etc.) is used.
  • a tubular shape as shown in FIG. 2 is formed by welding the peripheral edges of the openings of the inner semifields 41A and 41B obtained by press-molding an austenitic stainless steel plate. Inner 41 is obtained. Similarly, by welding the peripheral edges of the openings of the outer semifields 42A and 42B obtained by press-molding a ferritic stainless steel plate, a tubular outer 42 as shown in FIG. 2 can be obtained. As shown in FIG. 3, semicircular holes 41b1 and 41b2 are formed in the upper portions of the inner halves 41A and 41B, respectively, and these inner halves 41A and 41B are welded and integrated to each other.
  • a circular through hole 41b (see FIG. 2) formed by combining the semicircular holes 41b1 and 41b2 is formed.
  • semicircular holes 42a1 and 42a2 are formed in the upper portions of the outer half bodies 42A and 42B, respectively, and in the upper portion of the outer 42 obtained by welding and integrating these outer half bodies 42A and 42B with each other.
  • a circular hole-shaped through hole 42a (see FIG. 2) formed by combining the semicircular holes 42a1 and 42a2 is formed, and the boss 7 is inserted through the through hole 42a and welded to the outer 42.
  • the introduction unit 4 constituting a part of the exhaust catalyst device 1 according to the present invention is configured as an inner / outer double pipe structure of the inner 41 and the outer 42, and the inner 41 through which high-temperature exhaust gas flows inside. Since the downstream side of the inner 41 constitutes a thermal expansion allowable portion 41a and is not constrained by the catalytic converter 2 and the outer 42 and is free of charge, the inner 41 can be freely thermally expanded. Therefore, even when the temperature of the exhaust gas is extremely high, it is possible to prevent damage and abnormal noise due to the difference in thermal expansion between the inner 41 and the outer 42.
  • the space S between the inner 41 and the outer 42 forms a heat insulating layer to block the conduction of high-temperature exhaust gas heat to the outer 42, so that the temperature rise of the outer 42 is suppressed.
  • the material of the metal constituting the inner 41 and the outer 42 is selected to be the most suitable for the heating temperature of the inner 41 and the outer 42.
  • the inner 41 exposed to high-temperature exhaust gas is made of austenitic stainless steel, which is a metal with high heat resistance
  • the outer 42, which has a lower heating temperature than the inner 41 is made of ferritic stainless steel, which has excellent workability and strength. Therefore, the rational design of the introduction unit 4 becomes possible.
  • the inner 41 and the outer 42 are easily integrated by welding the inner semifields 41A and 41B, which are press-molded products divided into two, and the outer semifields 42A and 42B, respectively. Can be manufactured to. Further, the upstream end portions of the inner 41 and the outer 42 are configured as cylindrical portions 41c and 42b joined to each other, and the cylindrical portions 41c and 42b are fitted into the circular holes 6a of the mounting flange 6 to fit the mounting flange. 6 can be easily attached to the upstream end of the inner 41 and the outer 42, and by attaching this mounting flange 6 to the exhaust side end surface of the cylinder head 12 (see FIG. 1) of the internal combustion engine 10, the exhaust catalyst device is concerned. 1 can be attached to the internal combustion engine 10. In this case, since the upstream end of the introduction portion 4 can be accurately attached to the internal combustion engine 10 by the mounting flange 6, the downstream end of the introduction portion 4 is accurately positioned with respect to the catalytic converter 2. be able to.
  • the thermal expansion allowable portion 41a of the inner 41 is arranged close to the outer 42, the gap between the inner 41 and the outer 42 is suppressed to a small size, and high-temperature exhaust gas is discharged in this gap. It becomes difficult to enter, and it is possible to prevent the temperature of the outer 42 from becoming locally high due to the exhaust gas.
  • a rough sensor 8 penetrating the outer 42 and the inner 41 is attached to the outer 42 so that the rough sensor 8 and the through hole 41b of the inner 41 do not come into contact with each other. Since the gap ⁇ is formed, the oxygen concentration in the exhaust gas can be detected with high accuracy by the rough sensor 8.
  • FIGS. 4 and 5 are shown in FIGS. 4 and 5, respectively.
  • the same elements as those shown in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted below.
  • FIG. 4 is a vertical sectional view of an introduction portion 4 according to another embodiment 1 of the exhaust catalyst device 1 according to the present invention.
  • a boss 17 for attaching a rough sensor 8 is attached to the outer 42.
  • the tubular portion 17a of the boss 17 extends to a position close to the inner 41.
  • the gap between the rough sensor 8 and the inner 41 is suppressed to a small size, and the inflow of exhaust gas flowing through the inner 41 into the outer 42 is effective. Therefore, it is possible to obtain the effect of preventing the local temperature rise of the outer 42 due to the exhaust gas.
  • FIG. 5 is a vertical cross-sectional view of the introduction portion 4 according to another embodiment 2 of the exhaust catalyst device 1 according to the present invention.
  • the gap between the thermal expansion allowable portion 41a of the inner 41 and the outer 42 is taken.
  • a ring-shaped slide member 9 is interposed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Silencers (AREA)

Abstract

La présente invention concerne un dispositif catalyseur d'échappement comprenant un convertisseur catalytique pour l'épuration de gaz d'échappement et une partie d'introduction tubulaire qui guide le gaz d'échappement évacué d'un orifice d'échappement d'un moteur à combustion interne jusqu'à une surface d'extrémité d'entrée du convertisseur catalytique. La partie d'introduction (4) est configurée sous la forme d'une structure à double tube interne/externe ayant une partie interne (41) et une partie externe (42), et le côté aval de la partie interne (41) constitue une section permettant l'expansion thermique (41a) qui n'est pas en contact avec un convertisseur catalytique (2) ou la partie externe (42). La partie interne (41) et la partie externe (42) sont constituées de différents métaux, et la résistance résistante à la chaleur du métal constituant la partie interne (41) est supérieure à la résistance résistante à la chaleur du métal constituant la partie externe (42). Du fait de cette configuration, l'invention concerne un dispositif catalyseur d'échappement pour un moteur à combustion interne, avec lequel il est possible de guider le gaz d'échappement vers le convertisseur catalytique et d'épurer le gaz d'échappement tout en absorbant l'expansion thermique de la partie d'introduction pour réduire au minimum les dommages à la partie d'introduction et l'apparition de bruits anormaux, même lorsque le gaz d'échappement est extrêmement élevé en température.
PCT/JP2021/017478 2020-05-13 2021-05-07 Dispositif catalyseur d'échappement pour moteur à combustion interne WO2021230147A1 (fr)

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JP2020084748A JP2021179196A (ja) 2020-05-13 2020-05-13 内燃エンジンの排気触媒装置
JP2020-084748 2020-05-13

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1018840A (ja) * 1996-07-04 1998-01-20 Calsonic Corp 二重管排気マニホールド
JP2000303831A (ja) * 1999-04-21 2000-10-31 Sango Co Ltd 触媒コンバータ
JP2002054437A (ja) * 2000-08-14 2002-02-20 Calsonic Kansei Corp 二重管型排気マニホールド
JP2005330501A (ja) * 2004-05-18 2005-12-02 Nisshin Steel Co Ltd エキゾーストマニホールド用オーステナイト系ステンレス鋼
JP2007211663A (ja) * 2006-02-08 2007-08-23 Honda Motor Co Ltd 排気触媒装置および該排気触媒装置を備える多気筒内燃機関
JP2011196211A (ja) * 2010-03-18 2011-10-06 Mazda Motor Corp エンジンの排気装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1018840A (ja) * 1996-07-04 1998-01-20 Calsonic Corp 二重管排気マニホールド
JP2000303831A (ja) * 1999-04-21 2000-10-31 Sango Co Ltd 触媒コンバータ
JP2002054437A (ja) * 2000-08-14 2002-02-20 Calsonic Kansei Corp 二重管型排気マニホールド
JP2005330501A (ja) * 2004-05-18 2005-12-02 Nisshin Steel Co Ltd エキゾーストマニホールド用オーステナイト系ステンレス鋼
JP2007211663A (ja) * 2006-02-08 2007-08-23 Honda Motor Co Ltd 排気触媒装置および該排気触媒装置を備える多気筒内燃機関
JP2011196211A (ja) * 2010-03-18 2011-10-06 Mazda Motor Corp エンジンの排気装置

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