EP1989413B1 - Exhaust assembly for optimising the performances of internal combustion engines for motorcars - Google Patents

Exhaust assembly for optimising the performances of internal combustion engines for motorcars Download PDF

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Publication number
EP1989413B1
EP1989413B1 EP06809098A EP06809098A EP1989413B1 EP 1989413 B1 EP1989413 B1 EP 1989413B1 EP 06809098 A EP06809098 A EP 06809098A EP 06809098 A EP06809098 A EP 06809098A EP 1989413 B1 EP1989413 B1 EP 1989413B1
Authority
EP
European Patent Office
Prior art keywords
tubes
exhaust assembly
manifold
assembly according
tube
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.)
Not-in-force
Application number
EP06809098A
Other languages
German (de)
French (fr)
Other versions
EP1989413A1 (en
Inventor
Alessandro Gilli
Davide Branchini
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.)
Supersprint SRL
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Supersprint SRL
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Filing date
Publication date
Application filed by Supersprint SRL filed Critical Supersprint SRL
Priority to SI200630634T priority Critical patent/SI1989413T1/en
Publication of EP1989413A1 publication Critical patent/EP1989413A1/en
Application granted granted Critical
Publication of EP1989413B1 publication Critical patent/EP1989413B1/en
Not-in-force 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
    • F01N13/08—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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits

Definitions

  • the present invention relates to an exhaust assembly for optimising the performances of internal combustion engines of the aspirated type for motorcars.
  • the present invention relates to an exhaust assembly for optimising the performance of a normally aspirated internal combustion engine with at least 10 cylinders split into two cylinder heads.
  • an exhaust assembly for optimising the performances of an internal combustion engine for motorcars in which the exhaust unit comprises two exhaust gas conveying devices, each of which has a manifold and at least five tubes, each of which is fastened to a fastening flange to a respective cylinder and is connected to the manifold in common to the five tubes.
  • the exhaust assembly described above has the drawback of being particularly cumbersome, due to the high number of tubes and being difficult to install in the engine bay of a motorcar due to the reduced available space. These difficulties are amplified by the fact that, in order to optimise the performances of the internal combustion engine, it is suitable for the tubes to have the same dynamic behaviour in relation to resistance to exhaust gas flow output by the respective cylinders. Generally, the dynamic balance between the various tubes is obtained by adopting essentially the same length for all tubes and maintaining the aforesaid tubes as straight as possible.
  • the object of the present invention is to make an exhaust assembly for optimising the performances of internal combustion engines of the aspirated type for motorcars which is free from the aforesaid drawbacks without for this negatively effecting the performances of the internal combustion engine.
  • an exhaust assembly for optimising the performances of an internal combustion engine, in particular of an engine of the aspirated type with at least ten cylinders split into two cylinder heads, each cylinder head being provided with at least five cylinders, the exhaust assembly comprising two exhaust gas conveying devices, wherein each device comprises a manifold and at least five tubes, each of which has a fastening flange to a respective cylinder and is connected to the manifold; the exhaust assembly being characterised in that each tube of a device has a different length and a different shape from the other tubes of the same device; the tubes having a shorter length extend along a more tortuous path than the path of the tubes having a longer length.
  • number 1 indicates as a whole an exhaust unit for optimising the performances of internal combustion engines of the aspirated type for motorcars.
  • the internal combustion engine of the known type is not shown in the accompanying figures and comprises two cylinder heads, along which five cylinders are aligned.
  • Assembly 1 comprises two devices 2 for conveying exhaust gas of a respective cylinder head.
  • Each device 2 is associated to a corresponding cylinder head and comprises a manifold 3 and five tubes 4, each of which has on one first end a flange 5 for coupling the tube 4 to a corresponding cylinder and a second end connected to manifold 3 by means of a releasable attachment 6 of the known type.
  • Tubes 4 have a circular cross section, which is kept constant for the entire length of tubes 4 and which has a diameter from 40 to 45 mm, and are formed by a plurality of curved segments and straight segments joined together.
  • the respective lengths and also the respective shapes of the five tubes 4 of a same device 2 differ one from the other.
  • Flanges 5 of a same device 2 are arranged at different distances from manifold 3 and, consequently, tubes 4 are of different length, but thanks to the numerous curved segments and to the different shapes conferred to tubes 4, the lengths of tubes 4 vary in a range lower than the range existing between the distance laying between manifold 3 and the flange 5 most distant from manifold 3 and the distance laying between manifold 3 and the flange 5 closest to manifold 3.
  • the load losses generated in a long and relatively straight tube 4 are essentially equal to the load losses of shorter tube 4 developed along a more tortuous path. This allows the exhaust gases expelled by the cylinders of one cylinder head to reach manifold 3 at the same time regardless of tube 4 along which the exhaust gases are conveyed.
  • each device 2 comprises tubes 4 whose length is different from that of the other tubes 4 and in which the difference of length is comprised in a certain range.
  • minor load loss compensations are possible thanks to the different conformation of the curved segments associated to tubes 4.
  • the curved segments of short tubes 4 have a higher curvature with respect to the curvature of the curved segments of long tubes 4 so as to allow, on one hand, to contain the differences of length of tubes 4 and to uniform the load losses of the tubes 4 themselves.
  • the curved segments and the straight segments of each tube 4 may be selected according to the conformation which minimises the dimensions of device 2.
  • each flange 5 is fixed directly to a curved end segment 7 of each tube 4 which determines a sudden deviation of path with respect to the ideal axis of flange 5.
  • This feature is common to all tubes 4 and is particularly effective in containing the dimensions of each device 2.
  • Each tube 4 has a straight end segment 8, which is arranged on the opposite end of curved segment 7 and which converges into manifold 3, which has a union 9, in which the five tubes 4 are inserted and to which the tubes 4 are secured by means of releasable attachment 8.
  • Figure 2 shows a device 2 made according to a variant which envisages the non-releasable fastening of tubes 4 to manifold 3.
  • tubes 4 are welded directly to union 9.
  • the advantages which derive from the present invention essentially consist in containing dimensions without compromising optimisation of the performances of the internal combustion engine with respect, for example, to a straight tube exhaust assembly. If tubes 4 are connected by means of releasable attachment 8, assembly 1 is easier to install because the engine does not need to be extracted from the engine bay for assembly and disassembly of assembly 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Valve Device For Special Equipments (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

An exhaust assembly for optimising the performances of an internal combustion engine for motorcars, in particular of an engine of the aspirated type with at least ten cylinders split into two cylinder heads, each cylinder head being provided with at least five cylinders, has two exhaust gas conveying devices (2), wherein each device (2) comprises a manifold (3) and at least five tubes (4), each of which has a fastening flange (5) to a respective cylinder, and is connected to the manifold (3), and has a different length and a different shape from the other tubes (4) of the same device (2); the tubes (4) having a shorter length extending along a more tortuous path than the path of the tubes (4) having a longer length.

Description

    TECHNICAL FIELD
  • The present invention relates to an exhaust assembly for optimising the performances of internal combustion engines of the aspirated type for motorcars.
  • In particular, the present invention relates to an exhaust assembly for optimising the performance of a normally aspirated internal combustion engine with at least 10 cylinders split into two cylinder heads.
    • BACKGROUND ART
  • An exhaust assembly for optimising the performances of an internal combustion engine for motorcars is known, in which the exhaust unit comprises two exhaust gas conveying devices, each of which has a manifold and at least five tubes, each of which is fastened to a fastening flange to a respective cylinder and is connected to the manifold in common to the five tubes.
  • The exhaust assembly described above has the drawback of being particularly cumbersome, due to the high number of tubes and being difficult to install in the engine bay of a motorcar due to the reduced available space. These difficulties are amplified by the fact that, in order to optimise the performances of the internal combustion engine, it is suitable for the tubes to have the same dynamic behaviour in relation to resistance to exhaust gas flow output by the respective cylinders. Generally, the dynamic balance between the various tubes is obtained by adopting essentially the same length for all tubes and maintaining the aforesaid tubes as straight as possible.
    • DISCLOSURE OF INVENTION
  • The object of the present invention is to make an exhaust assembly for optimising the performances of internal combustion engines of the aspirated type for motorcars which is free from the aforesaid drawbacks without for this negatively effecting the performances of the internal combustion engine.
  • According to the present invention, an exhaust assembly for optimising the performances of an internal combustion engine, in particular of an engine of the aspirated type with at least ten cylinders split into two cylinder heads, each cylinder head being provided with at least five cylinders, the exhaust assembly comprising two exhaust gas conveying devices, wherein each device comprises a manifold and at least five tubes, each of which has a fastening flange to a respective cylinder and is connected to the manifold; the exhaust assembly being characterised in that each tube of a device has a different length and a different shape from the other tubes of the same device; the tubes having a shorter length extend along a more tortuous path than the path of the tubes having a longer length.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • For a better understanding of the present invention, a preferred embodiment will now be described only by way of non-limitative example, and with reference to the accompanying drawings, in which:
    • figure 1 is a perspective view, with parts removed for clarity, of the exhaust assembly made according to the present invention; and
    • figure 2 is a perspective view, with parts removed for clarity, of a variant of the exhaust assembly in figure 1.
    BEST MODE FOR CARRYING OUT THE INVENTION
  • With reference to figure 1, number 1 indicates as a whole an exhaust unit for optimising the performances of internal combustion engines of the aspirated type for motorcars. The internal combustion engine of the known type is not shown in the accompanying figures and comprises two cylinder heads, along which five cylinders are aligned. Assembly 1 comprises two devices 2 for conveying exhaust gas of a respective cylinder head. Each device 2 is associated to a corresponding cylinder head and comprises a manifold 3 and five tubes 4, each of which has on one first end a flange 5 for coupling the tube 4 to a corresponding cylinder and a second end connected to manifold 3 by means of a releasable attachment 6 of the known type.
  • Tubes 4 have a circular cross section, which is kept constant for the entire length of tubes 4 and which has a diameter from 40 to 45 mm, and are formed by a plurality of curved segments and straight segments joined together. The respective lengths and also the respective shapes of the five tubes 4 of a same device 2 differ one from the other.
  • Flanges 5 of a same device 2 are arranged at different distances from manifold 3 and, consequently, tubes 4 are of different length, but thanks to the numerous curved segments and to the different shapes conferred to tubes 4, the lengths of tubes 4 vary in a range lower than the range existing between the distance laying between manifold 3 and the flange 5 most distant from manifold 3 and the distance laying between manifold 3 and the flange 5 closest to manifold 3.
  • In other words, the longer tube 4, the straighter tube 4, while the shorter tube 4, the more curved segments are present, or rather the curved segments have a higher curvature. In this way, the load losses generated in a long and relatively straight tube 4 are essentially equal to the load losses of shorter tube 4 developed along a more tortuous path. This allows the exhaust gases expelled by the cylinders of one cylinder head to reach manifold 3 at the same time regardless of tube 4 along which the exhaust gases are conveyed.
  • In essence, each device 2 comprises tubes 4 whose length is different from that of the other tubes 4 and in which the difference of length is comprised in a certain range. Within this range, minor load loss compensations are possible thanks to the different conformation of the curved segments associated to tubes 4. Indeed, the curved segments of short tubes 4 have a higher curvature with respect to the curvature of the curved segments of long tubes 4 so as to allow, on one hand, to contain the differences of length of tubes 4 and to uniform the load losses of the tubes 4 themselves. In addition to this, the curved segments and the straight segments of each tube 4 may be selected according to the conformation which minimises the dimensions of device 2. With this regard, each flange 5 is fixed directly to a curved end segment 7 of each tube 4 which determines a sudden deviation of path with respect to the ideal axis of flange 5. This feature is common to all tubes 4 and is particularly effective in containing the dimensions of each device 2.
  • Each tube 4 has a straight end segment 8, which is arranged on the opposite end of curved segment 7 and which converges into manifold 3, which has a union 9, in which the five tubes 4 are inserted and to which the tubes 4 are secured by means of releasable attachment 8.
  • Figure 2 shows a device 2 made according to a variant which envisages the non-releasable fastening of tubes 4 to manifold 3. In this case, tubes 4 are welded directly to union 9.
  • As apparent from the described above, the advantages which derive from the present invention essentially consist in containing dimensions without compromising optimisation of the performances of the internal combustion engine with respect, for example, to a straight tube exhaust assembly. If tubes 4 are connected by means of releasable attachment 8, assembly 1 is easier to install because the engine does not need to be extracted from the engine bay for assembly and disassembly of assembly 1.

Claims (9)

  1. An exhaust assembly for optimising the performances of an internal combustion engine, in particular of an engine of the aspirated type with at least ten cylinders split into two cylinder heads, each cylinder head being provided with at least five cylinders, the exhaust assembly (1) comprising two exhaust gas conveying devices (2), wherein each device (2) comprises a manifold (3) and at least five tubes (4), each of which has a fastening flange (5) to a respective cylinder and is connected to the manifold (3); the exhaust assembly being characterised in that each tube (4) of a device (2) has a different length and a different shape from the other tubes (4) of the same device (2); the tubes (4) having a shorter length extending along a more tortuous path than the path of the tubes (4) having a longer length.
  2. An assembly according to claim 1, characterised in that each tube (4) has a plurality of curved segments and a plurality of straight segments.
  3. An assembly according to claim 1 or 2, characterised in that each tube (4) has a constant cross section for its entire length.
  4. An assembly according to claim 3, characterised in that all the tubes (4) have a constant cross section.
  5. An exhaust assembly according to claim 3 or 4, characterised in that the circular cross section has a diameter from 40 to 45 mm.
  6. An exhaust assembly according to any of the preceding claims, characterised in that each tube (4) has a curved end segment (7) directly fixed to said flange (5).
  7. An exhaust assembly according to any of the preceding claims, characterised in that each tube (4) has a straight end segment (8) directly connected to said manifold (3).
  8. An exhaust assembly according to any of the preceding claims, characterised by comprising a releasable attachment (6) for connecting said tubes (4) to said manifold (3).
  9. An exhaust assembly according to any of the claims from 1 to 7, characterised in that said tubes (4) are connected to the manifold (3) in a non-releasable manner.
EP06809098A 2006-02-14 2006-10-23 Exhaust assembly for optimising the performances of internal combustion engines for motorcars Not-in-force EP1989413B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200630634T SI1989413T1 (en) 2006-02-14 2006-10-23 Exhaust assembly for optimising the performances of internal combustion engines for motorcars

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000055U ITMI20060055U1 (en) 2006-02-14 2006-02-14 EXHAUST UNIT TO OPTIMIZE THE PERFORMANCE OF INTERNAL COMBUSTION ENGINES FOR MOTOR VEHICLES
PCT/IB2006/002961 WO2007093843A1 (en) 2006-02-14 2006-10-23 Exhaust assembly for optimising the performances of internal combustion engines for motorcars

Publications (2)

Publication Number Publication Date
EP1989413A1 EP1989413A1 (en) 2008-11-12
EP1989413B1 true EP1989413B1 (en) 2010-02-17

Family

ID=37896005

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06809098A Not-in-force EP1989413B1 (en) 2006-02-14 2006-10-23 Exhaust assembly for optimising the performances of internal combustion engines for motorcars

Country Status (6)

Country Link
EP (1) EP1989413B1 (en)
AT (1) ATE458135T1 (en)
DE (1) DE602006012379D1 (en)
IT (1) ITMI20060055U1 (en)
SI (1) SI1989413T1 (en)
WO (1) WO2007093843A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3089678B2 (en) * 1991-02-21 2000-09-18 スズキ株式会社 Exhaust manifold for internal combustion engine
JPH11200856A (en) * 1998-01-13 1999-07-27 Daihatsu Motor Co Ltd Structure of exhaust manifold in internal combustion engine
JP2001055920A (en) * 1999-08-18 2001-02-27 Honda Motor Co Ltd Connection structure of exhaust pipe
JP2001073761A (en) * 1999-09-07 2001-03-21 Kawasaki Heavy Ind Ltd 2-cycle multiple cylinder engine
JP2004353583A (en) * 2003-05-29 2004-12-16 Calsonic Kansei Corp Assembly part structure of exhaust manifold

Also Published As

Publication number Publication date
ATE458135T1 (en) 2010-03-15
WO2007093843A1 (en) 2007-08-23
DE602006012379D1 (en) 2010-04-01
ITMI20060055U1 (en) 2007-08-15
EP1989413A1 (en) 2008-11-12
SI1989413T1 (en) 2010-06-30

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