EP2636864A1 - Dual pipe exhaust manifold - Google Patents

Dual pipe exhaust manifold Download PDF

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Publication number
EP2636864A1
EP2636864A1 EP13001125.7A EP13001125A EP2636864A1 EP 2636864 A1 EP2636864 A1 EP 2636864A1 EP 13001125 A EP13001125 A EP 13001125A EP 2636864 A1 EP2636864 A1 EP 2636864A1
Authority
EP
European Patent Office
Prior art keywords
pipe
pipes
collector
exhaust manifold
branch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13001125.7A
Other languages
German (de)
English (en)
French (fr)
Inventor
Kazuya Uchida
Tsukasa Minato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marelli Corp
Original Assignee
Calsonic Kansei Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Calsonic Kansei Corp filed Critical Calsonic Kansei Corp
Publication of EP2636864A1 publication Critical patent/EP2636864A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
    • 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
    • F01N13/14—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 having thermal insulation
    • F01N13/141—Double-walled exhaust pipes or housings
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/10—Exhaust treating devices having provisions not otherwise provided for for avoiding stress caused by expansions or contractions due to temperature variations
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled

Definitions

  • the present invention relates to a dual pipe exhaust manifold such that an outer side of an inner pipe, where exhaust gas which is discharged from an internal combustion engine flows, is covered by an outer pipe to have a gap.
  • the outer pipe forms an outer covering as a wire mesh with a ring shape, a gap to the extent of the thickness of the wire mesh is secured between the inner pipe and the outer pipe, and corresponds to distortion (stretching, shrinkage) in the inner pipe in an axial direction as a floating structure where the inner pipe and the outer pipe are able to move relative to each other in the axial direction.
  • an inner pipe holding member with a thick wall which is joined to the inner pipe and the outer pipe by spot welding, is provided, and thermal expansion difference which is generated between the inner pipe and outer pipe is dissipated and alleviated.
  • the present invention focuses on the problems described above and the object is to provide a dual pipe exhaust manifold which is able to prevent a reduction in longevity of an inner pipe which is caused by concentration of distortion of the inner pipe due to thermal expansion.
  • a dual pipe exhaust manifold includes an inner pipe, an outer pipe and a plurality of spacers.
  • the inner pipe includes a plurality of branch pipes and a plurality of collector pipes.
  • the collector pipes are slidably connected to each other.
  • One end of each of the branch pipe is fixed to a flange section configured and arranged to be attached to a cylinder head of an engine, and the other end of each of the branch pipe is slidably connected to a corresponding one of the collector pipes so that each of the collector pipes is connected to a plural number of the branch pipes.
  • the outer pipe covers a circumference of the inner pipe.
  • the spacers are disposed between the outer pipe and the inner pipe to form a gap therebetween.
  • a dual pipe exhaust manifold according to a second aspect is the dual pipe exhaust manifold according to the first aspect, wherein the collector pipes are fitted to each other so as to be slidable with respect to each other in a direction parallel to the flange section.
  • a dual pipe exhaust manifold according to a third aspect is the dual pipe exhaust manifold according to the first or second aspect, wherein each of the branch pipes is fitted in the corresponding one of the collector pipes from one of a direction parallel to the flange section and a direction perpendicular to the flange section.
  • a dual pipe exhaust manifold according to a fourth aspect is the dual pipe exhaust manifold according to any one of the first to third aspects, wherein each of the collector pipes is an integrally press-formed pipe in which opposing end portions are disposed on an opposite side from a surface to be hit by exhaust gas that has flowed into the collector pipe.
  • a dual pipe exhaust manifold according to a fifth aspect is the dual pipe exhaust manifold according to any one of the second to fourth aspects, wherein at least two of the branch pipes are respectively fitted in corresponding ones of the collecting sections in a direction parallel to the flange section and in directions opposed to each other.
  • a dual pipe exhaust manifold according a sixth aspect is the dual pipe exhaust manifold according to any one of the first to fifth aspects, wherein a tip end of each of the collector pipes and the branch pipes which is slidably inserted into a corresponding one of the collector pipes and the branch pipes is extended in a radial direction toward an inner circumferential surface of the corresponding one of the collector pipes and the branch pipes and folded back to reduce leakage of exhaust gas.
  • the dual pipe exhaust manifold of the third aspect it is possible to absorb stretching in the direction which is parallel to the flange section and the direction which is perpendicular to the flange section with regard to the collector pipe based on thermal expansion of the inner pipe while the amount of protrusion in the perpendicular direction from the flange section of the inner tube and the outer tube is suppressed to be small.
  • the dual pipe exhaust manifold of the fourth aspect it is possible to manufacture the collector pipe at a low cost due to welding or the like being unnecessary, and even in this case, it is possible to prevent defects (reduction of the flow rate of exhaust gas and generation of noise, vibration, and the like) such as exhaust gas which has flowed into the collector pipe flowing as it is into the gap between the collector pipe and the outer pipe from the gap of the end portions which oppose each other.
  • Fig. 1 is a diagram illustrating a dual pipe exhaust manifold of a first embodiment of the present invention and is a perspective view where a portion of an outer tube of the dual pipe exhaust manifold has been cut off.
  • Fig. 2 is a diagram illustrating a portion of a collector pipe of a dual pipe exhaust manifold of the first embodiment.
  • Fig. 3 is a diagram where a portion of a collector pipe of the dual pipe exhaust manifold of the first embodiment is viewed from an engine side.
  • Fig. 4 is a cross section diagram illustrating a portion of the dual pipe exhaust manifold of a second embodiment of the present invention.
  • Fig. 1 illustrates a dual pipe exhaust manifold of the first embodiment.
  • an upper half portion of an outer pipe 3 is drawn in a state of being cut off in order for the structure of an inner pipe 2 which is an inner portion thereof to be easily seen.
  • the dual pipe exhaust manifold of the present embodiment is connected to a four-cylinder engine 1.
  • the dual pipe exhaust manifold of the first embodiment is used in a vehicle, and is provided with the inner pipe 2 through which exhaust gas discharged from the engine 1 flows, and the outer pipe 3 which covers the inner pipe 2 from the outer circumference side.
  • the inner pipe 2 is manufactured with a thin wall as compared with the outer pipe 3 using metal which has high heat resistance and corrosion resistance, and is provided with a flange section 20, four branch pipes 21a to 21d, and two collector pipes 22a and 22b.
  • the dual pipe exhaust manifold further includes three spacers 23a to 23c for securing a gap between the inner pipe 2 and the outer pipe 3.
  • the flange section 20 is fixed by being welded to an exhaust gas upstream side end section of the branch pipes 21a to 21d to match the exhaust gas inlet holes.
  • the branch pipes 21a and 21d are formed at both end sides are J shaped and the two branch pipes 21b and 21c therebetween are formed in a linear shape.
  • the branch pipes 21a and 21d at both end sides are arranged so that the exhaust gas downstream side end sections thereof oppose each other.
  • Each of the collector pipes 22a and 22b have an axial direction opening section which is provided on each of one end side and another end side thereof and a perpendicular direction opening section which is opened in the perpendicular direction to the collector pipes 22a and 22b toward the flange section 20 at a central position of both axial direction opening sections on an axis extending parallel along the longitudinal direction of the flange section 20.
  • the exhaust gas downstream side end section of the branch pipe 21a which is arranged in a reverse J shape as viewed from above is fitted in the axial direction opening section of one end side of the collector pipe 22a so as to be able to slide relatively in the axial direction, and the axial direction opening section of one end side of the collector pipe 22b is fitted in an axial direction opening section of another end side of the collector pipe 22a so as to be able to slide relatively in the axial direction.
  • the exhaust gas downstream side end section of the branch pipe 21b is fitted in the perpendicular direction opening section of the collector pipe 22a so as to be able to slide relatively in the direction which is perpendicular to the flange section 20.
  • the exhaust gas downstream side end section of the branch pipe 21d which is arranged in a J shape as viewed from above is fitted in the axial direction opening section on the other end side so as to be able to slide relatively in the axial direction, and the exhaust gas downstream side end section of the branch pipe 21c is fitted in the perpendicular direction opening section so as to be able to slide relatively in the direction which is perpendicular to the flange section 20.
  • a discharge pipe portion is integrally provided in a downward direction by a hole being provided in a lower surface at a position between the other end side of the axial direction opening section and the perpendicular direction opening section on the collector pipe 22b.
  • the collector pipes 22a and 22b are formed by stamping and pressing a sheet of metal as shown in Figs. 2 and 3 , and are formed into pipe shapes where both end portions face each other (to become opposing portions).
  • the opposing portions are not fixed by welding or the like, and a perpendicular direction opening section is formed here. Accordingly, exhaust gas which flows inside of the branch pipes 21b and 21c flows in from the perpendicular direction opening section and hits a surface which is on the opposite side to the perpendicular direction opening section, and the flow direction thereof is changed to the axial direction.
  • the outer pipe 3 is formed with a thick wall as compared with the inner pipe 2 using a metal material such as stainless steel with high rigidity, high heat resistance and corrosion resistance, and the branch pipes 21a to 21d and the collector pipes 22a and 22b are formed by combining and fixing an upper half portion and a lower half portion which respectively cover above and below in a state where a gap is formed between the pipes.
  • a metal material such as stainless steel with high rigidity, high heat resistance and corrosion resistance
  • the spacer 23a is attached at a fitting portion of the one end side of the axial direction opening section of the collector pipe 22a and the exhaust gas downstream side end section of the branch pipe 21a
  • the spacer 23b is attached at a fitting portion of one end side of the axial direction opening section of the collector pipe 22b and the other end side of the axial direction opening section of the collector pipe 22a
  • the spacer 23c is attached at a fitting portion of the other end side of the axial direction opening section of the collector pipe 22b and the exhaust gas downstream side end section of the branch pipe 21d, and a gap is formed between the inner pipe 2 and the outer pipe 3 by each of the spacers being supported by the inner surfaces of the outer pipe 3.
  • the spacers 23a to 23c are, for example, configured as a wire mesh ring or the like.
  • exhaust gas is discharged from the four exhaust ports of the cylinder head 1a to the corresponding branch pipes 21a to 21d by the engine 1 being operated.
  • the exhaust gas flows into each of the corresponding branch pipes 21a to 21d, enters from the branch pipe 21a into the one end side of the axial direction opening section of the collector pipe 22a along the axial direction, flows from the branch pipe 21b into the perpendicular direction opening section of the collector pipe 22a in the direction which is perpendicular to the axial direction, and changes direction to the axial direction by hitting the perpendicular direction opening section, that is, a surface which is on the opposite side of the opposing portion.
  • the exhaust gas moves toward the axial direction opening section on the one end side of the collector pipe 22b.
  • the gas is discharged from a discharge pipe portion in a downward direction.
  • the exhaust gas flows in from the branch pipe 21c into the perpendicular direction opening section of the collector pipe 22b in a direction which is perpendicular to the axial direction and is discharged from the discharge pipe portion in a downward direction after changing direction to the axial direction toward the axial direction opening section on the other end side of the collector pipe 22b by hitting the perpendicular direction opening section, that is, the surface which is on the opposite side of the opposing portion.
  • the exhaust gas is discharged in a downward direction from the discharge pipe portion after flowing from the branch pipe 21d toward the collector pipe 22a side from the axial direction opening section on the other end side of the collector pipe 22b in the axial direction.
  • the inner pipe 2 which is directly exposed to high temperature exhaust gas changes shape due to thermal expansion, and in particular, changes shape so as to become larger in the longitudinal direction thereof.
  • expansion in the direction which is perpendicular to the flange section 20 of the branch pipes 21a to 21d is where the collector pipes 22a and 22b stretch and move in both directions of the branch pipes 21a and 21d.
  • the fitting portions of the perpendicular direction opening sections of the collector pipes 22a and 22b and the exhaust gas downstream side end sections of the branch pipes 21b and 21c absorb by sliding relatively when difference is generated in the stretching of the branch pipes 21b and 21c and the collector pipes 22a and 22b.
  • expansion in the direction which is parallel with regard to the flange section 20 of the branch pipes 21a to 21d is absorbed by relative sliding of the fitting portion of the exhaust gas downstream side end section of the branch pipe 21a and one end side of the axial direction opening section of the collector pipe 22a, the fitting portion of the other end side of the axial direction opening section of the collector pipe 22a and one end side of the axial direction opening section of the collector pipe 22b, and the fitting portion of the other end side of the axial direction opening section of the collector pipe 22b and the exhaust downstream side end section of the branch pipe 21d.
  • the outer pipe 3 covers the inner pipe 2 with a gap so as not to reduce the temperature of the exhaust gas which flows in the inner pipe 2, it is easy for the exhaust gas which is maintained at a high temperature to be purified using a catalyst which is positioned downstream of the manifold.
  • the outer pipe 3 prevents leakage of the exhaust gas, which has leaked from the fitting portions of the collector pipes 22a and 22b and the branch pipes 21a to 21d with the collector pipes 22a and 22b which configure the inner pipe 2, to the outside of the outer pipe 3.
  • the fitting portions of the collector pipes 22a and 22b and the branch pipes 21a to 21d with the collector pipes 22a and 22b which configure the inner pipe 2 are able to slide in a direction which is parallel to the flange section 20 and a direction which is perpendicular to the flange section 20, it is possible to absorb the stretching even in a case where the inner pipe 2 thermally expands due to the temperature of the exhaust gas, and as a result, it is possible to achieve an improvement in high temperature resistance and an increase in the longevity of the inner pipe 2.
  • collector pipes 22a and 22b are fitted so as to be able to slide in a direction which is parallel to the flange section 20, it is possible to suppress the amount of protrusion from the cylinder head 1a of the exhaust manifold to be small.
  • the exhaust gas downstream side end section of the branch pipes 21a and 21d is fitted in the collecting sections 22a and 22b from a direction which is parallel to the flange section 20 from a direction where they relatively oppose each other, it is possible to suppress movement in the parallel direction where collecting sections 22a and 22b from becoming larger during thermal expansion of the branch pipes 21a to 21d, and as a result, it is possible to reduce adverse effects on other sections.
  • collector pipes 22a and 22b are integrally press-formed pipes which have end portions which oppose each other at the opposite side to the surface which is hit by exhaust gas which has flowed in, it is possible not only to reduce production costs by welding being unnecessary but also to avoid the exhaust gas which has flowed in from the branch pipes 21b and 21c directly hitting the opposing portions which are not fixed and converting the direction to the axial direction.
  • the configuration of the sliding portions of the branch pipes 21a to 21d and the collector pipes 22a and 22b is different to the configuration of first embodiment in the dual pipe exhaust manifold of the second embodiment.
  • the exhaust gas downstream side end section of the branch pipe 21a is stretched towards an inner circumferential surface of the exhaust gas upstream side end section of the collector pipe 22a by being extended to a radial direction outer side, and the tip end section is folded back so as to be curled.
  • a curled portion 21a1 is set so as to be in line contact at an inner circumferential surface of the collector pipe 22a.
  • the sliding portion of the downstream side end section of the branch pipe 21b and the upstream side end of the collector pipe 22a, the sliding portion of the upstream side ends of the branch pipe 21c and the collector pipe 22b, and the sliding portion of the upstream side ends of the branch pipe 21d and the collector pipe 22b have the same configuration as described above.
  • the curled portion 21a1 has a spring function and the gap is maintained to be narrow due to thermal expansion.
  • the curled portion 21a1 also is suitable for sliding.
  • temperature of the outer pipe is increased by storing exhaust gas which has leaked from the gap in a space between the inner pipe 2 and the outer pipe 3 in the dual pipe exhaust manifold of second embodiment, and as a result, it is possible to prevent defects such as damage to the outer pipe 3 by heat distortion being generated in the outer pipe 3 due to repetition of rising and falling of the temperature of the outer pipe 3.
  • the present invention has been described based on each of the embodiments described above but the present invention is not limited to the embodiments and the present invention includes cases where there are design changes and the like in a scope which does not depart from the gist of the present invention.
  • curled portions are provided in the sliding portions at the branch pipes 21a to 21d side in second embodiment, but the curled portions may also be provided at the sliding portion side of the collector pipes 22a and 22b.
  • curled portion in all of the sliding portions of the branch pipes 21a to 21d and the collector pipes 22a and 22b, and may be provided only in sliding portions of the branch pipes 21a and 21d and the collector pipes 22a and 22b where leakage is severe.
  • the dual pipe exhaust manifold of the present invention is not limited to a four-cylinder engine, and may be applied to, for example, a six-cylinder engine or the like.
  • the discharge pipe portion may be provided at a different position.
  • the term “comprising” and its derivatives, as used herein, are intended to be open ended terms that specify the presence of the stated features, elements, components, groups, integers, and/or steps, but do not exclude the presence of other unstated features, elements, components, groups, integers and/or steps.
  • the foregoing also applies to words having similar meanings such as the terms, “including”, “having” and their derivatives.
  • the terms “part,” “section,” “portion,” “member” or “element” when used in the singular can have the dual meaning of a single part or a plurality of parts.
  • the terms of degree such as “substantially”, “about” and “approximately” as used herein mean a reasonable amount of deviation of the modified term such that the end result is not significantly changed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Joints Allowing Movement (AREA)
EP13001125.7A 2012-03-08 2013-03-06 Dual pipe exhaust manifold Withdrawn EP2636864A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012051412 2012-03-08
JP2012276065A JP2013213491A (ja) 2012-03-08 2012-12-18 二重管式エキゾースト・マニホールド

Publications (1)

Publication Number Publication Date
EP2636864A1 true EP2636864A1 (en) 2013-09-11

Family

ID=47844042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13001125.7A Withdrawn EP2636864A1 (en) 2012-03-08 2013-03-06 Dual pipe exhaust manifold

Country Status (4)

Country Link
US (1) US20130232960A1 (ja)
EP (1) EP2636864A1 (ja)
JP (1) JP2013213491A (ja)
CN (1) CN103306795A (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112513437A (zh) * 2018-05-15 2021-03-16 康明斯公司 双壁集成凸缘接头

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7485513B2 (ja) * 2020-01-06 2024-05-16 フタバ産業株式会社 排気管
CN113970022B (zh) * 2021-10-25 2023-03-24 浙江恒展机械有限公司 一种可调型软管接头

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Publication number Priority date Publication date Assignee Title
US6220605B1 (en) * 1998-07-14 2001-04-24 Caterpillar Inc. Slip joint connection for engine exhaust system
FR2879652A1 (fr) * 2004-12-20 2006-06-23 Renault Sas Collecteur d'echappement a double paroi
DE102006008782A1 (de) * 2006-02-24 2007-08-30 Arvinmeritor Emissions Technologies Gmbh Abgasleitungssystem
JP2010255611A (ja) 2009-04-28 2010-11-11 Toyota Motor Corp 二重管構造の排気マニホールド

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Publication number Priority date Publication date Assignee Title
US6220605B1 (en) * 1998-07-14 2001-04-24 Caterpillar Inc. Slip joint connection for engine exhaust system
FR2879652A1 (fr) * 2004-12-20 2006-06-23 Renault Sas Collecteur d'echappement a double paroi
DE102006008782A1 (de) * 2006-02-24 2007-08-30 Arvinmeritor Emissions Technologies Gmbh Abgasleitungssystem
JP2010255611A (ja) 2009-04-28 2010-11-11 Toyota Motor Corp 二重管構造の排気マニホールド

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112513437A (zh) * 2018-05-15 2021-03-16 康明斯公司 双壁集成凸缘接头

Also Published As

Publication number Publication date
JP2013213491A (ja) 2013-10-17
US20130232960A1 (en) 2013-09-12
CN103306795A (zh) 2013-09-18

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