EP1985820A1 - Abgaskrümmer aus wärmebeständigem gussstahl - Google Patents

Abgaskrümmer aus wärmebeständigem gussstahl Download PDF

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Publication number
EP1985820A1
EP1985820A1 EP07714523A EP07714523A EP1985820A1 EP 1985820 A1 EP1985820 A1 EP 1985820A1 EP 07714523 A EP07714523 A EP 07714523A EP 07714523 A EP07714523 A EP 07714523A EP 1985820 A1 EP1985820 A1 EP 1985820A1
Authority
EP
European Patent Office
Prior art keywords
flanges
ports
exhaust manifold
heat
cast steel
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.)
Granted
Application number
EP07714523A
Other languages
English (en)
French (fr)
Other versions
EP1985820A4 (de
EP1985820B1 (de
Inventor
Hirofumi Kimura
Tomomi Souda
Masanao Suzuki
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.)
Proterial Ltd
Original Assignee
Hitachi Metals Ltd
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 Hitachi Metals Ltd filed Critical Hitachi Metals Ltd
Publication of EP1985820A1 publication Critical patent/EP1985820A1/de
Publication of EP1985820A4 publication Critical patent/EP1985820A4/de
Application granted granted Critical
Publication of EP1985820B1 publication Critical patent/EP1985820B1/de
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/22—Moulds for peculiarly-shaped castings
    • B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
    • 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
    • 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1861—Construction facilitating manufacture, assembly, or disassembly the assembly using parts formed by casting or moulding
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/22—Methods or apparatus for fitting, inserting or repairing different elements by welding or brazing
    • 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
    • F01N2530/00—Selection of materials for tubes, chambers or housings

Definitions

  • the present invention relates to an exhaust manifold made of heat-resistant cast steel, which can be produced with a small number of steps at a high yield, and has small weight and excellent thermal deformation resistance.
  • the exhaust manifold for gathering an exhaust gas from an engine and sending it to an exhaust pipe comprises pluralities of flanges each having a hole connected to each exhaust port of a cylinder head of an engine with bolts, a port connected to each flange, and a convergence portion in which pluralities of ports are converging.
  • the flanges are generally thicker than the ports in the exhaust manifold ( Fig. 2 ) as described in JP 10-26018 A .
  • the flanges have an average thickness of about 12 mm, and the ports have an average thickness of about 5 mm. In casting such exhaust manifold, voids are likely generated in the finally solidified flanges.
  • each flange is provided with a riser 6 as shown in Fig. 3 , so that a melt is supplied to the flange during solidification.
  • risers are not used as part of the products, resulting in a lower yield per the melt used. Further, risers should be removed after casting, a larger number of steps is needed.
  • an object of the present invention is to provide an exhaust manifold made of heat-resistant cast steel, which can be produced with a small number of steps at a high yield, and has small weight and excellent thermal deformation resistance.
  • the exhaust manifold of the present invention made of heat-resistant cast steel comprises pluralities of flanges each having a hole connected to each exhaust port of a cylinder head of an engine with bolts, pluralities of ports connected to the flanges, and a convergence portion in which the ports are converging, the thickness of the flanges being 80-150% of that of the ports.
  • Hole-surrounding portions are preferably 110-300% as thick as the flanges.
  • the exhaust manifold preferably has a ridge extending along each port from the convergence portion.
  • the thickness of the ridges is 70-140% of that of the ports.
  • Fig. 1(a) is a schematic plan view showing the exhaust manifold of the present invention made of heat-resistant cast steel.
  • Fig. 1(b) is a cross-sectional view taken along the line A-A in Fig. 1(a) .
  • Fig. 2(a) is a schematic plan view showing a conventional exhaust manifold.
  • Fig. 2(b) is a cross-sectional view taken along the line B-B in Fig. 2(a) .
  • Fig. 3 is a schematic view showing a riser provided for casting a conventional exhaust manifold.
  • Fig. 4(a) is a schematic plan view showing a preferred example of the exhaust manifolds of the present invention made of heat-resistant cast steel.
  • Fig. 4(b) is a schematic front view showing another preferred example of the exhaust manifolds of the present invention made of heat-resistant cast steel.
  • Fig. 4(c) is a schematic side view showing a further preferred example of the exhaust manifolds of the present invention made of heat-resistant cast steel.
  • Fig. 5 is a cross-sectional view showing a ridge.
  • the thickness of flanges, ports and bolthole-surrounding portions is expressed by an average value.
  • the bolthole-surrounding portion in the flange has a thickness t 3 as shown in Fig. 1(b) .
  • the ridge has a thickness t 4 in a cross section perpendicular to a longitudinal direction as shown in Fig. 5 .
  • each flange 2 need not be provided with a riser, making it possible to produce the exhaust manifold with a smaller number of steps at a higher yield.
  • the thickness of the flanges 2 is less than 80% of that of the ports 3, the flanges 2 are not easily filled with a melt, resulting in insufficient melt flow.
  • the flanges 2 are more than 150% as thick as the ports 3, the flanges 2 are likely to have voids.
  • the flanges 2 are preferably 85-130% as thick as the ports 3.
  • each flange 2 and the surrounding portion 5 of each bolthole 4 after casting and before machining are thicker by a predetermined machining margin 7
  • the thickness t 1 of the flange 2 and the thickness t 3 of the surrounding portion 5 of the bolthole 4 are expressed as thickness from the surface 21 of the flange 2 after machining in the present invention, as shown in Fig. 1(b) .
  • the thickness of the surrounding portions 5 of the boltholes 4 is 110-300% of that of the flanges 2, the flanges 2 are not easily thermally deformed even if the exhaust manifold is exposed to a high-temperature exhaust gas. Thus, an exhaust gas is prevented from flowing out through gaps between the exhaust ports of a cylinder head and the flanges 2 of the exhaust manifold.
  • the surrounding portions 5 of the boltholes 4 are less than 110% as thick as the flanges 2, the flanges 2 are easily thermally deformed by a high-temperature exhaust gas. When it exceeds 300%, voids are likely generated in the flanges 2 during casting.
  • the thickness t 4 of the ridge 11 is preferably 70-140% as thick as the port 3.
  • t 4 is less than 70% of the thickness of the ports 3, the thermal deformation of the ports 3 cannot be sufficiently prevented.
  • t 4 exceeds 140%, the exhaust manifold cannot be made light in weight.
  • the thickness t 4 of the ridges 11 is preferably 80-120% as thick as the ports 3.
  • the ridges 11 may extend from the convergence portion 8 to the branching portions of the ports 3 as shown in Figs. 4(b) and 4(c) .
  • the heat-resistant-cast-steel-made exhaust manifold of the present invention is preferably made of, for instance, heat-resistant, austenitic cast steel comprising by mass 0.2-1.0% of C, 0.05-0.6% of (C-Nb/8), 2% or less of Si, 2% or less of Mn, 8-20% of Ni, 15-30% of Cr, 0.5-6.0% of Nb, 1-6% of W, 0.01-0.3% of N, and 0.01-0.5% of S, the balance being Fe and inevitable impurities.
  • Exhaust manifolds shown in Fig. 1 were formed by heat-resistant, austenitic cast steel having a composition comprising by mass 0.45% of C, 1.2% of Si, 1.0% of Mn, 0.015% of P, 0.015% of S, 10% of Ni, 20% of Cr, 1.5% of Nb, and 3.0% of W (Examples 1-8 and Comparative Examples 1-3).
  • the thickness t 1 of a flange 2, the thickness t 2 of a port 3, and the thickness t 3 of an surrounding portion 5 of a bolthole 4 are shown in Table 1.
  • Exhaust manifolds shown in Fig. 4(a) were also formed by the same heat-resistant, austenitic cast steel as above (Examples 9-14).
  • the thickness t 4 of ridges 11 is shown in Table 1 together with t 1 to t 3 .
  • the exhaust manifolds of the present invention having flanges 80-150% as thick as ports were produced free from voids without providing risers, and suffered only small thermal deformation during use.
  • Examples 1, 2 and 4-8 in which the bolthole-surrounding portions were 110-300% as thick as the flanges, suffered small thermal deformation.
  • the exhaust manifolds of Examples 9-14 each having ridges extending along the ports from the convergence portion suffered smaller thermal deformation.
  • the exhaust manifold of the present invention made of heat-resistant cast steel and having the above structure, which has small weight and excellent thermal deformation resistance, can be efficiently produced with a small number of steps.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP07714523A 2006-02-17 2007-02-19 Abgaskrümmer aus wärmebeständigem gussstahl Expired - Fee Related EP1985820B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006040499 2006-02-17
PCT/JP2007/052997 WO2007094500A1 (ja) 2006-02-17 2007-02-19 耐熱鋳鋼製排気マニホールド

Publications (3)

Publication Number Publication Date
EP1985820A1 true EP1985820A1 (de) 2008-10-29
EP1985820A4 EP1985820A4 (de) 2010-01-06
EP1985820B1 EP1985820B1 (de) 2012-09-05

Family

ID=38371671

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07714523A Expired - Fee Related EP1985820B1 (de) 2006-02-17 2007-02-19 Abgaskrümmer aus wärmebeständigem gussstahl

Country Status (6)

Country Link
US (1) US20090064670A1 (de)
EP (1) EP1985820B1 (de)
JP (1) JPWO2007094500A1 (de)
KR (1) KR20080096666A (de)
CN (1) CN101384803A (de)
WO (1) WO2007094500A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009011748B4 (de) * 2009-03-09 2013-05-23 Tenneco Gmbh Abgasanlage für eine Verbrennungskraftmaschine mit nebeneinander angeordneten Flanschplatten
DE102014103820A1 (de) * 2014-03-20 2015-09-24 Benteler Automobiltechnik Gmbh Abgaskrümmer für eine Abgasanlage eines Verbrennungsmotors
US9488081B2 (en) 2014-12-17 2016-11-08 Caterpillar Inc. Exhaust manifold assembly and system
EP3730756B1 (de) * 2019-04-26 2021-09-22 Kubota Corporation Abgasystem für eine brennkraftmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4182122A (en) * 1978-02-15 1980-01-08 Caterpillar Tractor Co. Insulated exhaust manifold
US5566548A (en) * 1994-11-09 1996-10-22 Caterpillar Inc. Exhaust manifold joint
EP0955453A2 (de) * 1998-05-05 1999-11-10 Friedrich Boysen GmbH & Co. KG Abgaskrümmer
US6256990B1 (en) * 1998-12-28 2001-07-10 Hitachi Metals, Ltd. Exhaust manifold integrally cast with turbine housing for turbocharger

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60137112U (ja) * 1984-02-22 1985-09-11 トヨタ自動車株式会社 エキゾ−ストマニホ−ルド
JPS63132825U (de) * 1987-02-23 1988-08-30
JP2605242B2 (ja) * 1991-04-17 1997-04-30 豊田合成株式会社 ステアリングホイール芯金の製造方法
JPH0658120U (ja) * 1991-07-16 1994-08-12 本田技研工業株式会社 多気筒エンジンの排気マニホールド
JPH1026018A (ja) 1996-07-10 1998-01-27 Nissan Motor Co Ltd 内燃機関の排気マニホルド
JPH1162741A (ja) * 1997-08-08 1999-03-05 Suzuki Motor Corp エンジンの吸気マニホルド
JP4269244B2 (ja) * 1999-04-14 2009-05-27 日立金属株式会社 エキゾーストマニホールド用鋳物
JP2001207841A (ja) * 2000-01-24 2001-08-03 Mitsubishi Motors Corp 多気筒エンジン用排気マニホールド
JP2002309935A (ja) * 2001-02-08 2002-10-23 Hitachi Metals Ltd 耐熱鋳鋼製排気系部品
JP2003063224A (ja) * 2001-08-29 2003-03-05 Hitachi Metals Ltd 自動車用サスペンションアーム
JP4087320B2 (ja) * 2003-09-12 2008-05-21 本田技研工業株式会社 内燃機関用シリンダブロック

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4182122A (en) * 1978-02-15 1980-01-08 Caterpillar Tractor Co. Insulated exhaust manifold
US5566548A (en) * 1994-11-09 1996-10-22 Caterpillar Inc. Exhaust manifold joint
EP0955453A2 (de) * 1998-05-05 1999-11-10 Friedrich Boysen GmbH & Co. KG Abgaskrümmer
US6256990B1 (en) * 1998-12-28 2001-07-10 Hitachi Metals, Ltd. Exhaust manifold integrally cast with turbine housing for turbocharger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2007094500A1 *

Also Published As

Publication number Publication date
KR20080096666A (ko) 2008-10-31
US20090064670A1 (en) 2009-03-12
WO2007094500A1 (ja) 2007-08-23
CN101384803A (zh) 2009-03-11
EP1985820A4 (de) 2010-01-06
JPWO2007094500A1 (ja) 2009-07-09
EP1985820B1 (de) 2012-09-05

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