JPH0612201Y2 - Exhaust system for engine with exhaust turbocharger - Google Patents
Exhaust system for engine with exhaust turbochargerInfo
- Publication number
- JPH0612201Y2 JPH0612201Y2 JP1988034404U JP3440488U JPH0612201Y2 JP H0612201 Y2 JPH0612201 Y2 JP H0612201Y2 JP 1988034404 U JP1988034404 U JP 1988034404U JP 3440488 U JP3440488 U JP 3440488U JP H0612201 Y2 JPH0612201 Y2 JP H0612201Y2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- turbine
- turbocharger
- exhaust pipe
- downstream side
- 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 - Lifetime
Links
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- Supercharger (AREA)
Description
【考案の詳細な説明】 （産業上の利用分野） この考案は、排気ターボ過給機の排気抵抗を軽減する排
気ターボ過給機付エンジンの排気装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an exhaust system for an engine with an exhaust turbocharger that reduces the exhaust resistance of the exhaust turbocharger.
（従来の技術） 従来の排気ターボ過給機は、タービンの下流側排気通路
の内径の大きさが、通路の末端に至るまでタービン出口
径とほぼ同じ大きさであるため排気の流れに対し、排気
通路内壁との摩擦で排気抵抗を生じて、タービン効率を
低下させる原因となっていた。（例えば実開昭６２−５
２２３９号公報参照） （考案が解決しようとする課題） すなわち、排気タービン内で大きな旋回流速を有してい
た排気は、タービン出口より排気通路内に入ってもまだ
大きな旋回流速をもっている。(Prior Art) In a conventional exhaust turbocharger, the inner diameter of the exhaust passage on the downstream side of the turbine is almost the same as the turbine outlet diameter up to the end of the passage. Friction with the inner wall of the exhaust passage causes exhaust resistance, which reduces turbine efficiency. (For example, actual development 62-5
(Refer to Japanese Patent No. 2239) (Problem to be solved by the invention) That is, the exhaust gas having a large swirl flow velocity inside the exhaust turbine still has a large swirl flow velocity even after entering the exhaust passage from the turbine outlet.
そのため円管状の排気通路の半径（ｒ）の内壁には旋回
流速成分（ｕ）による遠心力〔Ｐ∝u2/r〕が排気通路壁
に対し垂直に作用し、従って排気通路を流れる上記遠心
力（Ｐ）を有する排気と、摩擦係数（μ）を有する通路
の内壁との間には排気の流れに逆らう摩擦力〔Ｆ∝μ
Ｐ〕が作用することになる。Therefore, a centrifugal force [P∝u 2 / r] due to the swirling flow velocity component (u) acts on the inner wall of the circular exhaust passage having a radius (r) perpendicularly to the exhaust passage wall, and therefore the centrifugal fluid flowing in the exhaust passage is Between the exhaust having the force (P) and the inner wall of the passage having the friction coefficient (μ), the frictional force [F∝μ against the flow of the exhaust]
P] will act.
従って、摩擦力（Ｆ）は上記各式より通路の半径（ｒ）
に反比例し、従来のように排気通路の内径が末端に至る
までタービン出口の径とほぼ同じく小さいならば、摩擦
力（Ｆ）はかなり大きくなる。Therefore, the frictional force (F) is calculated from the above equations by the radius (r) of the passage.
If the inner diameter of the exhaust passage is as small as the diameter of the turbine outlet up to the end as in the conventional case, the frictional force (F) will be considerably large.
そのため排気通路を流れる排気に対する摩擦力（Ｆ）が
いわゆる排気抵抗となり、タービン効率を悪くするとい
う問題があった。Therefore, there is a problem that the frictional force (F) with respect to the exhaust gas flowing through the exhaust passage causes so-called exhaust resistance, which deteriorates turbine efficiency.
また、排気抵抗の低減のため単に排気通路径を大きくす
るとスペースをとり、車体搭載性が悪化してしまう。Further, if the diameter of the exhaust passage is simply increased to reduce the exhaust resistance, a space is taken up and the mountability of the vehicle body deteriorates.
この考案は、車のエンジンルームのように空間的に制約
を受ける場所に設置される排気タービンにおいて、その
下流側の排気通路を通る排気の流れ抵抗を可及的に小さ
くしてタービンの効率を高めるようにした排気ターボ過
給機付エンジンの排気装置を提供することを目的として
いる。This invention, in an exhaust turbine installed in a place where space is restricted, such as the engine room of a car, reduces the flow resistance of exhaust gas passing through the exhaust passage on the downstream side as much as possible to improve turbine efficiency. It is an object of the present invention to provide an exhaust system for an engine with an exhaust turbocharger that is enhanced.
（課題を解決するための手段） 上記の目的を達成するためのこの考案は、タービンの旋
回方向に排気を導入し、タービン軸方向に排気を導出す
ることでタービンを回転させる排気ターボ過給機を備え
たエンジンの排気装置において、タービン下流側の排気
通路に、タービン直下流より所定距離の間、タービン軸
の延長線を軸心として同心円状に内径を広げた拡大部を
設け、該拡大部は、下流側に向かって順に、徐々に拡大
する拡開部と、最大半径部と、該最大半径部から徐々に
縮小する縮小部とより構成されている排気ターボ過給機
付エンジンの排気装置である。(Means for Solving the Problems) The present invention for achieving the above object is directed to an exhaust turbocharger for rotating a turbine by introducing the exhaust gas in the turning direction of the turbine and guiding the exhaust gas in the axial direction of the turbine. In an exhaust system for an engine, the exhaust passage on the turbine downstream side is provided with an enlarged portion in which the inner diameter is expanded concentrically with an extension line of the turbine shaft as an axis for a predetermined distance from a position immediately downstream of the turbine. Is an exhaust device for an engine with an exhaust turbocharger, which is composed of an expanding portion that gradually expands toward the downstream side, a maximum radius portion, and a contracting portion that gradually reduces from the maximum radius portion. Is.
また、排気ターボ過給機の排気下流側に排気管を接続し
て、此の排気管の排気ターボ過給機取付部近傍より所定
距離の間を、上記した拡開部と、最大半径部と、縮小部
とからなる拡大部とした排気ターボ過給機付エンジンの
排気装置である。Further, an exhaust pipe is connected to the exhaust downstream side of the exhaust turbocharger, and a predetermined distance from the vicinity of the exhaust turbocharger mounting part of this exhaust pipe is set to the above-mentioned expanded portion and maximum radius portion. The exhaust device for an engine with an exhaust turbocharger is an enlarged part including a reduction part.
また、上記排気管に形成した拡大部の所定距離のうちで
拡開部より縮小部を長くした排気ターボ過給機付エンジ
ンの排気装置である。Further, it is an exhaust device for an engine with an exhaust turbocharger, wherein a contracted portion is longer than a widened portion within a predetermined distance of the widened portion formed in the exhaust pipe.
また、上記排気ターボ過給機のタービンハウジング内の
タービン下流側の排気通路中を拡開せず、上記排気ター
ボ過給機の排気下流側に上記拡大部を形成している排気
管を接続した排気ターボ過給機付エンジンの排気装置で
ある。Further, the exhaust passage in the turbine housing of the exhaust turbocharger is not expanded in the exhaust passage on the turbine downstream side, and the exhaust pipe forming the enlarged portion is connected to the exhaust downstream side of the exhaust turbocharger. Exhaust Exhaust system for turbocharged engines.
（作用） 排気が通路を流れる時に受ける摩擦抵抗は〔Ｆ∝μu2/
r〕で表され、摩擦抵抗（Ｆ）は通路の半径（ｒ）に反
比例するものであるから、内径の大きさ上記拡大部に排
気が流れるときに生じる摩擦抵抗は、従来の径の小さい
排気通路を流れる時より両者の径の大きさに反比例して
小さくなる。(Function) The frictional resistance received when exhaust gas flows through the passage is [F∝μu 2 /
r] and the frictional resistance (F) is inversely proportional to the radius (r) of the passage. Therefore, the frictional resistance generated when the exhaust gas flows through the enlarged portion is smaller than that of the conventional exhaust gas having a small diameter. It becomes smaller in inverse proportion to the size of both diameters than when flowing through the passage.
よって排気の旋回力による排気抵抗を効率よく低減でき
る。Therefore, the exhaust resistance due to the swirling force of the exhaust can be efficiently reduced.
（実施例） 第１図及び第２図は、この考案の一実施例として、排気
ターボ過給機の排気下流側に排気管を接続して、この排
気管に拡大部を形成したものを示すもので、（１）はエ
ンジンに備えた排気ターボ過給機で、エンジンに吸気を
過給する吸気コンプレッサ（２）と、この吸気コンプレ
ッサ（２）に軸結されてエンジンの排気で駆動される排
気タービン（３）とからなっている。(Embodiment) FIGS. 1 and 2 show an embodiment of the present invention in which an exhaust pipe is connected to an exhaust downstream side of an exhaust turbocharger and an enlarged portion is formed in the exhaust pipe. Reference numeral (1) is an exhaust turbocharger provided in the engine, which is driven by the exhaust gas of the engine (2) and the intake compressor (2) that supercharges intake air to the engine. It consists of an exhaust turbine (3).
（４）はタービンケーシングで、内部に吸気コンプレッ
サ（２）に軸結するタービンホィール（５）を嵌装する
とともに、エンジンからの排気導入部（６）及び過流室
（７）を形成し、さらに排気を導出する半径（ｒ）のス
トレートなタービン出口（８）をタービン軸心（Ｓ）に
沿って開口している。(4) is a turbine casing in which a turbine wheel (5) axially coupled to an intake compressor (2) is fitted, and an exhaust introduction part (6) from an engine and an overflow chamber (7) are formed, Furthermore, a straight turbine outlet (8) having a radius (r) that guides exhaust gas is opened along the turbine axis (S).
（９）は排気管で、タービン出口（８）の端部にフラン
ジ結合され、結合端から所定長さ（ｌ）の拡大部（１
０）を形成している。(9) is an exhaust pipe, which is flanged to the end of the turbine outlet (8) and has an enlarged portion (1) of a predetermined length (l) from the connecting end.
0) is formed.
この拡大部（１０）はタービン軸（Ｓ）の延長線（Ｓ
ｘ）を軸心として下流側に進むにつれて半径を同心円状
に徐々に拡大した拡開部（１０ａ）に続いて、タービン
出口（８）のほぼ２倍の最大半径（Ｒｍａｘ）を持つ最
大半径部（１０ｂ）を形成し、この最大半径部（１０
ｂ）からより緩やかに徐々に半径を縮小して、タービン
出口（８）とほぼ同じ半径（ｒ）に至っる縮小部（１０
ｃ）が連続している。This enlarged portion (10) is an extension line (S) of the turbine shaft (S).
x) is an axial center, and the radius is gradually expanded concentrically as it goes downstream, followed by a maximum radius portion having a maximum radius (Rmax) that is almost twice that of the turbine outlet (8). (10b), and the maximum radius (10
The radius (b) is gradually reduced from b) to a radius (r) which is almost the same as that of the turbine outlet (8).
c) is continuous.
つまり、拡開部（１０ａ）より縮小部（１０ｃ）の方が
長くなっている。That is, the contracting portion (10c) is longer than the expanding portion (10a).
この、拡大部（１０）の軸心方向の所定長さ（ｌ）は、
排気の旋回流速が著しく衰えるまでの長さが必要で、タ
ービン出口（８）の半径（ｒ）のほぼ数倍の長さとされ
る。The predetermined length (l) in the axial direction of the enlarged portion (10) is
It is necessary to have a length until the swirling flow velocity of the exhaust gas significantly decreases, and the length is approximately several times the radius (r) of the turbine outlet (8).
従って、半径（ｒ）のストレートなタービン出口（８）
から排気が旋回流速（ｕ）をもって拡大部（１０）に流
入すると、排気は下流側に進むにつれて旋回流が拡開部
（１０ａ）の内壁に接し、その旋回半径は徐々に大きく
なり、最大半径部（１０ｂ）に至って最大の（Ｒｍａ
ｘ）となる間に排気と内壁との間に生じる摩擦抵抗は漸
次減少し、続いて縮小部（１０ｃ）を進行するにつれて
旋回半径は緩やかに長い距離をもって縮小されるが、そ
の間には旋回流速が漸次低下するため、排気と内壁との
摩擦抵抗が増すことはない。Therefore, a straight turbine outlet of radius (r) (8)
When the exhaust gas flows into the expanding portion (10) with a swirling flow velocity (u) from the exhaust gas, the swirling flow of the exhaust gas contacts the inner wall of the expanding portion (10a) as it goes downstream, the swirling radius gradually increases, and the maximum radius Part (10b) reaches the maximum (Rma
x), the frictional resistance generated between the exhaust gas and the inner wall gradually decreases, and the swirling radius is gradually reduced with a long distance as it advances through the contracting section (10c). Is gradually decreased, so that the frictional resistance between the exhaust gas and the inner wall does not increase.
この拡開部（１０ａ）、最大半径部（１０ｂ）、縮小部
（１０ｃ）からなる平均半径（Ｒｘ）の拡大部（１０）
を通るときの排気と内壁との間に生じる摩擦抵抗は（Ｆ
∝μu2/Ｒｘ）となる。The expansion part (10) of the average radius (Rx) consisting of the expansion part (10a), the maximum radius part (10b), and the contraction part (10c).
The frictional resistance generated between the exhaust gas and the inner wall when passing through
∝μu 2 / Rx).
拡大部（１０）の所定長さ（ｌ）の間に生じる排気の摩
擦抵抗（Ｆ）と、タービン出口（８）の半径（ｒ）と同
じ半径の従来の排気通路における摩擦抵抗（ｆ∝μu2/
r）とを比較すると、拡大部（１０）の平均半径（Ｒ
ｘ）は従来の排気通路の半径（ｒ）の１．５倍であると
して、両者の摩擦抵抗の比は、 Ｆ／ｆ＝（μ・u2/1.5ｒ）／（μ・u2/r） ＝１／１．５＝２／３となる。The frictional resistance (F) of the exhaust gas generated during the predetermined length (l) of the enlarged portion (10) and the frictional resistance (f∝μu) in the conventional exhaust passage having the same radius as the radius (r) of the turbine outlet (8). 2 /
Comparing with r), the average radius (R
x) is 1.5 times the radius (r) of the conventional exhaust passage, the ratio of the frictional resistance between them is F / f = (μ ・ u 2 /1.5r)/(μ ・ u 2 / r ) = 1 / 1.5 = 2/3.
すなわち、拡大部（１０）を設けた排気通路は、拡大部
を設けない従来の排気通路よりも摩擦抵抗が約３０％だ
け小さくなる。That is, the exhaust passage provided with the enlarged portion (10) has a friction resistance reduced by about 30% as compared with the conventional exhaust passage having no enlarged portion.
また、拡開部（１０ａ）を下流側に進むにつれて半径が
徐々に広がるため遠心力（Ａ）が内壁面に沿う前進力
（Ｂ）成分を持つことになるため益々排気抵抗を減少さ
せることになる。In addition, since the radius gradually expands as it goes downstream in the expanding portion (10a), the centrifugal force (A) has a forward force (B) component along the inner wall surface, which further reduces the exhaust resistance. Become.
このように、排気通路に設けた拡大部（１０）が排気の
摩擦抵抗を低減してタービン効率を向上させる。In this way, the enlarged portion (10) provided in the exhaust passage reduces the frictional resistance of exhaust gas and improves turbine efficiency.
（考案の効果） この考案によれば、排気ターボ過給機のタービン下流の
排気通路に、徐々に拡大して最大径に達した後徐々に縮
小する拡大部を形成したことにより、排気通路内に導出
される旋回流を持つ排気の摩擦抵抗を低減することがで
き、タービン効率の向上が図られるとともに、レスポン
スの改善並びに燃費や出力が改善される。(Effect of the Invention) According to the present invention, by forming an enlarged portion in the exhaust passage downstream of the turbine of the exhaust turbocharger, which gradually expands, reaches the maximum diameter, and then gradually contracts, It is possible to reduce the frictional resistance of the exhaust gas having the swirling flow that is derived to improve turbine efficiency, improve response, and improve fuel efficiency and output.
また、排気通路を広げる場所はタービン直下流より所定
距離の間のみであるため排気通路のスペースを著しく拡
大する不都合は生じない。Moreover, since the place where the exhaust passage is expanded is only a predetermined distance from the downstream of the turbine, there is no inconvenience of remarkably expanding the space of the exhaust passage.
第１図はこの考案に係わる排気ターボ過給機付エンジン
の排気装置の一実施例を示す中央縦断面図、第２図は第
１図のII−II線断面図である。 １……排気ターボ過給機 ３……排気タービン ５……タービンホィール ６……排気導入部 ８……タービン出口 ９……排気管 １０……拡大部 １０ａ……拡開部 １０ｂ……最大半径部 １０ｃ……縮小部 Ｓ……タービン軸 Ｓｘ……軸心延長線 Ｒｘ……拡大部の平均半径FIG. 1 is a central longitudinal sectional view showing an embodiment of an exhaust system for an engine with an exhaust turbocharger according to the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. 1 ... Exhaust turbocharger 3 ... Exhaust turbine 5 ... Turbine wheel 6 ... Exhaust introduction part 8 ... Turbine outlet 9 ... Exhaust pipe 10 ... Expanded part 10a ... Expanded part 10b ... Maximum radius Part 10c ...... Reduced part S ...... Turbine shaft Sx ...... Axis extension line Rx ...... Expanded part average radius
Claims (4)
ビン軸方向に排気を導出することでタービンを回転させ
る排気ターボ過給機を備えたエンジンの排気装置におい
て、タービン下流側の排気通路に、タービン直下流より
所定距離の間、タービン軸の延長線を軸心として同心円
状に内径を広げた拡大部を設け、該拡大部は、下流側に
向かって順に、徐々に拡大する拡開部と、最大半径部
と、該最大半径部から徐々に縮小する縮小部とより構成
されていることを特徴とする排気ターボ過給機付エンジ
ンの排気装置。1. An exhaust system for an engine, comprising an exhaust turbocharger for rotating a turbine by introducing exhaust gas in a turbine turning direction and discharging exhaust gas in a turbine axial direction, to an exhaust passage downstream of a turbine. An extension portion having a concentric inner diameter with the extension line of the turbine shaft as an axis for a predetermined distance from immediately downstream of the turbine, and the extension portion gradually expands toward the downstream side. An exhaust device for an engine with an exhaust turbocharger, comprising: a maximum radius portion; and a reduction portion that gradually reduces from the maximum radius portion.
管接続し、該排気管には、該排気管の排気ターボ過給機
取付部近傍より所定距離の間、タービン軸の延長線を軸
心として同心円状に内径を広げた拡大部を設け、該拡大
部は、下流側に向かって順に、徐々に拡大する拡開部
と、最大半径部と、該最大半径部から徐々に縮小する縮
小部とより構成されている、請求項１記載の排気ターボ
過給機付エンジンの排気装置。2. An exhaust pipe connected to the exhaust downstream side of the exhaust turbocharger, the extension line of the turbine shaft being connected to the exhaust pipe for a predetermined distance from the vicinity of the exhaust turbocharger mounting portion of the exhaust pipe. An enlarged portion is provided in which the inner diameter is concentrically expanded with the axis as the axis, and the enlarged portion gradually expands toward the downstream side, the maximum radius portion, and gradually decreases from the maximum radius portion. The exhaust system for an engine with an exhaust turbocharger according to claim 1, wherein the exhaust system is configured by a reduction unit.
管接続し、該排気管には、該排気管の排気ターボ過給機
取付部近傍より所定距離の間、タービン軸の延長線を軸
心として同心円状に内径を広げた拡大部を設け、該拡大
部は、下流側に向かって順に、徐々に拡大する拡開部
と、最大半径部と、該最大半径部から徐々に縮小する縮
小部とより構成され、拡開部の排気管より縮小部の排気
管を長くした、請求項２記載の排気ターボ過給機付エン
ジンの排気装置。3. An exhaust pipe connected to an exhaust downstream side of the exhaust turbocharger, the extension line of a turbine shaft being connected to the exhaust pipe for a predetermined distance from a vicinity of an exhaust turbocharger mounting portion of the exhaust pipe. An enlarged portion is provided in which the inner diameter is concentrically expanded with the axis as the axis, and the enlarged portion gradually expands toward the downstream side, the maximum radius portion, and gradually decreases from the maximum radius portion. The exhaust device for an engine with an exhaust turbocharger according to claim 2, wherein the exhaust pipe of the reduced portion is made longer than the exhaust pipe of the expanded portion.
のタービン下流側の排気通路中を拡開せず、排気ターボ
過給機の排気下流側に排気管を接続し、該排気管には、
該排気管の排気ターボ過給機取付部近傍より所定距離の
間、タービン軸の延長線を軸心として同心円状に内径を
広げた拡大部を設け、該拡大部は、下流側に向かって順
に、徐々に拡大する拡開部と、最大半径部と、該最大半
径部から徐々に縮小する縮小部とより構成され、拡開部
の排気管より縮小部の排気管を長くした、請求項３記載
の排気ターボ過給機付エンジンの排気装置。4. An exhaust pipe is connected to the exhaust downstream side of the exhaust turbocharger without expanding the inside of the exhaust passage on the turbine downstream side of the turbine housing of the exhaust turbocharger, and the exhaust pipe is connected to the exhaust pipe.
For a predetermined distance from the vicinity of the exhaust turbocharger mounting portion of the exhaust pipe, an enlarged portion is provided in which the inner diameter is concentrically widened with the extension line of the turbine shaft as an axis, and the enlarged portion is arranged in order toward the downstream side. The exhaust pipe of the expanding portion is made longer, the exhaust pipe of the expanding portion, the maximum radius portion, and the contracting portion gradually contracting from the maximum radius portion. Exhaust device for the engine with the described exhaust turbocharger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988034404U JPH0612201Y2 (en) | 1988-03-14 | 1988-03-14 | Exhaust system for engine with exhaust turbocharger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988034404U JPH0612201Y2 (en) | 1988-03-14 | 1988-03-14 | Exhaust system for engine with exhaust turbocharger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01136630U JPH01136630U (en) | 1989-09-19 |
| JPH0612201Y2 true JPH0612201Y2 (en) | 1994-03-30 |
Family
ID=31261114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988034404U Expired - Lifetime JPH0612201Y2 (en) | 1988-03-14 | 1988-03-14 | Exhaust system for engine with exhaust turbocharger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0612201Y2 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56156905U (en) * | 1980-04-23 | 1981-11-24 | ||
| JPS614002Y2 (en) * | 1981-06-15 | 1986-02-07 | ||
| JPS6054730U (en) * | 1983-09-21 | 1985-04-17 | 日産自動車株式会社 | variable capacity radial turbine |
| JPS6233070U (en) * | 1985-08-15 | 1987-02-27 |
-
1988
- 1988-03-14 JP JP1988034404U patent/JPH0612201Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01136630U (en) | 1989-09-19 |
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