DE4416251C1 - Exhaust port for IC engine - Google Patents

Exhaust port for IC engine

Info

Publication number
DE4416251C1
DE4416251C1 DE19944416251 DE4416251A DE4416251C1 DE 4416251 C1 DE4416251 C1 DE 4416251C1 DE 19944416251 DE19944416251 DE 19944416251 DE 4416251 A DE4416251 A DE 4416251A DE 4416251 C1 DE4416251 C1 DE 4416251C1
Authority
DE
Germany
Prior art keywords
section
duct
cross
flow
constriction
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.)
Expired - Fee Related
Application number
DE19944416251
Other languages
German (de)
Inventor
Rudolf Kast
Peter Dipl Ing Albrecht
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.)
Mercedes Benz Group AG
Original Assignee
Daimler Benz AG
Mercedes Benz AG
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 Daimler Benz AG, Mercedes Benz AG filed Critical Daimler Benz AG
Priority to DE19944416251 priority Critical patent/DE4416251C1/en
Application granted granted Critical
Publication of DE4416251C1 publication Critical patent/DE4416251C1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4264—Shape or arrangement of intake or exhaust channels in cylinder heads of exhaust channels
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Abstract

The exhaust port has a first cross-section (1a) which is almost constant directly behind the valve seat and a second cross-section (1b) with a cross-section expanding with distance. In this second section, there is also a constriction formed by a longitudinal rib (6). In the flow direction, either the height or the width of the rib gets larger.

Description

Die Erfindung betrifft einen Auslaßkanal an einer Brennkraftmaschine mit einer im Strömungsweg der Abgase vorgesehenen Verengung nach den im Oberbegriff des Patentanspruchs 1 abgegebenen Merkmalen.The invention relates to an outlet duct on a Internal combustion engine with one in the flow path of the exhaust gases provided narrowing according to the in the preamble of Features submitted.

Aus der DE-OS 19 62 897 ist ein derartiger Auslaßkanal bekannt, der eine Verengung als längliche Erhebung an der engsten Stelle des Auslaßkanals, also unmittelbar hinter dem Ventilsitz eines Gaswechselventiles in einem Kanalabschnitt mit etwa gleichbleibendem Durchlaßquerschnitt aufweist.Such an outlet channel is known from DE-OS 19 62 897, which is a narrowing as an elongated elevation at the narrowest point the outlet channel, that is, immediately behind the valve seat Gas exchange valves in a channel section with approximately has constant passage cross-section.

Mit einer derartigen Verengung sollen die Abgasverwirbelungen und Strömungsverluste im Auslaßkanal verringert werden.With such a constriction, the exhaust gas swirls should and flow losses in the outlet channel can be reduced.

Der Erfindung liegt die Aufgabe zugrunde, strömungsoptimierte Maßnahmen im Auslaßkanal einer Brennkraftmaschine vorzusehen, durch die Druckverluste minimiert werden können.The invention is based, flow-optimized the task To provide measures in the exhaust duct of an internal combustion engine, through which pressure losses can be minimized.

Diese Aufgabe wird bei einer gattungsgemäßen Einrichtung durch die im Kennzeichen des Patentanspruchs 1 angegebenen Merkmale gelöst.This task is performed in a generic device by the in the characteristics of Features specified claim 1 solved.

Durch die besondere Anordnung einer Verengung im Auslaßkanal wird die Querschnittserweiterung in dem Teil des Auslaßkanals verringert, dessen Querschnitt sich in Strömungsrichtung der Abgase zunehmend vergrößert. Es ergibt sich durch eine derartige Strömungsoptimierung des Auslaßkanals eine Verbesserung des Ladungswechsels von Brennkraftmaschinen. Eventuell auftretende Ablöseverluste werden zumindest minimiert. Ferner verringert sich der Druckverlust, die Ausschiebearbeit und Reibleistung. Due to the special arrangement of a constriction in the outlet duct becomes the cross-sectional expansion in the part of the exhaust duct reduced, the cross section of which in the flow direction Exhaust gases increasingly increasing. It results from such Flow optimization of the outlet channel an improvement in Charge change of internal combustion engines. Possibly occurring Transfer losses are at least minimized. Further reduced the pressure loss, the push-out work and the friction.  

In den Unteransprüchen sind noch förderliche Weiterbildungen der Erfindung angegeben.In the subclaims there are still further developments Invention specified.

Der Gegenstand der Erfindung ist in der Zeichnung dargestellt und im folgenden anhand eines Ausführungsbeispieles näher erläutert. Es zeigt:The object of the invention is shown in the drawing and in more detail below using an exemplary embodiment explained. It shows:

Fig. 1 den Auslaßkanal mit der erfindungsgemäßen Verengung im Längsschnitt und Fig. 1 shows the outlet channel with the constriction according to the invention in longitudinal section and

Fig. 2 die sich erweiternde Verengung in Draufsicht. Fig. 2 shows the widening narrowing in plan view.

Ein Auslaßkanal 1 im Zylinderkopf 2 einer Brennkraftmaschine gemäß Fig. 1 weist im Bereich des Gaswechselventiles 3 einen vom Ventilsitz 4 ausgehenden und bogenförmig verlaufenden ersten Kanalabschnitt 1a mit einem zumindest annähernd gleichbleibenden Durchlaßquerschnitt sowie einen unmittelbar nachfolgenden und quer zur Ventilachse a verlaufenden geradlinigen zweiten Kanalabschnitt 1b mit einem in Strömungsrichtung der Abgase zunehmend größer werdenden Querschnitt auf.An exhaust port 1 in the cylinder head 2 of an internal combustion engine according to FIG. 1 has, in the region of the gas exchange valve 3, a first channel section 1 a, starting from the valve seat 4 and running in an arc shape, with an at least approximately constant passage cross section, as well as a straight-following second straight channel section 1 , running transverse to the valve axis a b with an increasingly larger cross section in the flow direction of the exhaust gases.

Der Auslaßkanal 1 ist in seinem zweiten Kanalabschnitt 1b mit einer im Strömungsweg der Abgase die Querschnittserweiterung verringernden Verengung versehen, die von einer von der unteren Kanalwand 5 abragenden und in Strömungsrichtung sich erstreckenden Längsrippe 6 gebildet ist.The outlet channel 1 is provided in its second channel section 1 b with a narrowing in the flow path of the exhaust gases reducing the cross-sectional widening, which is formed by a longitudinal rib 6 projecting from the lower channel wall 5 and extending in the direction of flow.

Die mit durchgehenden Linien in Fig. 1 gekennzeichnete Längsrippe 6 hat über ihre gesamte Länge einen gleichmäßigen Querschnittsverlauf, während die mit strichpunktierten Linien gekennzeichnete Längsrippe 6 im Verlauf der Abgasströmung in der Höhe zunimmt.The longitudinal rib 6 marked with solid lines in FIG. 1 has a uniform cross-sectional shape over its entire length, while the longitudinal rib 6 marked with dash-dotted lines increases in height in the course of the exhaust gas flow.

In Fig. 2 ist die Längsrippe 6 so gestaltet, daß sie - in Strömungsrichtung gesehen - nur in ihrer Breite zunimmt, sie kann aber auch in Breite und Höhe zunehmen und etwa die Querschnittserweiterung des zweiten Kanalabschnitts 1b kompensieren.In Fig. 2, the longitudinal rib 6 is designed so that - seen in the direction of flow - only increases in width, but it can also increase in width and height and compensate for the cross-sectional expansion of the second channel section 1 b.

Die Längsrippe 6 kann sich lagemäßig auch an der gegenüberliegenden Kanalwand des Auslaßkanals 1 oder seitlich davon erstrecken.The longitudinal rib 6 can also positionally extend on the opposite channel wall of the outlet channel 1 or laterally therefrom.

Die Längsrippe ist für Brennkraftmaschinen mit Zwei- oder Mehrventiltechnik pro Zylinder geeignet.The longitudinal rib is for internal combustion engines with two or Multi-valve technology suitable for each cylinder.

Claims (3)

1. Auslaßkanal an einer Brennkraftmaschine, mit einer im Strömungsweg der Abgase angeordneten Verengung, mit einem Kanalabschnitt mit zumindest annähernd gleichbleibendem Durchlaßquerschnitt unmittelbar hinter dem Ventilsitz eines Gaswechselventiles und mit einem sich an diesen Kanalabschnitt anschließenden weiteren Kanalabschnitt mit in Strömungsrichtung der Abgase sich zunehmend erweiterndem Durchlaßquerschnitt, dadurch gekennzeichnet, daß die Verengung in dem sich querschnittsmäßig vergrößernden Kanalabschnitt (1b) vorgesehen ist.1. exhaust duct on an internal combustion engine, with a constriction arranged in the flow path of the exhaust gases, with a duct section with an at least approximately constant passage cross-section directly behind the valve seat of a gas exchange valve and with a further duct section adjoining this duct section with a passage cross-section widening in the flow direction of the exhaust gases, characterized in that the constriction is provided in which cross-sectionally widening duct portion (1 b). 2. Auslaßkanal nach Anspruch 1, dadurch gekennzeichnet, daß die Verengung durch mindestens eine von der Kanalwand (5) abragende und in Strömungsrichtung sich erstreckende Längsrippe (6; 6′) gebildet ist.2. Outlet duct according to claim 1, characterized in that the constriction is formed by at least one longitudinal rib ( 6 ; 6 ') projecting from the duct wall ( 5 ) and extending in the direction of flow. 3. Auslaßkanal nach Anspruch 2, dadurch gekennzeichnet, daß die Längsrippe (6) sich in Strömungsrichtung querschnittsmäßig in Höhe und/oder Breite vergrößert.3. Outlet duct according to claim 2, characterized in that the longitudinal rib ( 6 ) increases in cross-sectionally in height and / or width in the flow direction.
DE19944416251 1994-05-07 1994-05-07 Exhaust port for IC engine Expired - Fee Related DE4416251C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19944416251 DE4416251C1 (en) 1994-05-07 1994-05-07 Exhaust port for IC engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19944416251 DE4416251C1 (en) 1994-05-07 1994-05-07 Exhaust port for IC engine

Publications (1)

Publication Number Publication Date
DE4416251C1 true DE4416251C1 (en) 1995-06-08

Family

ID=6517625

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19944416251 Expired - Fee Related DE4416251C1 (en) 1994-05-07 1994-05-07 Exhaust port for IC engine

Country Status (1)

Country Link
DE (1) DE4416251C1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014125901A (en) * 2012-12-25 2014-07-07 Toyota Motor Corp Cylinder head
CN106762194A (en) * 2017-01-24 2017-05-31 李斯特技术中心（上海）有限公司 A kind of exhaust passage of naturally aspirated engine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1962897A1 (en) * 1968-12-02 1970-07-09 Ifa Motorenwerke Exhaust duct on internal combustion engines

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1962897A1 (en) * 1968-12-02 1970-07-09 Ifa Motorenwerke Exhaust duct on internal combustion engines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014125901A (en) * 2012-12-25 2014-07-07 Toyota Motor Corp Cylinder head
CN106762194A (en) * 2017-01-24 2017-05-31 李斯特技术中心（上海）有限公司 A kind of exhaust passage of naturally aspirated engine

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Legal Events

Date Code Title Description
8100 Publication of the examined application without publication of unexamined application
D1 Grant (no unexamined application published) patent law 81
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: DAIMLER-BENZ AKTIENGESELLSCHAFT, 70567 STUTTGART,

8327 Change in the person/name/address of the patent owner

Owner name: DAIMLERCHRYSLER AG, 70567 STUTTGART, DE

8339 Ceased/non-payment of the annual fee