JP2013525676A - 燃焼効率と排ガス性能とのバランスをとるように成形された燃焼ボウルを有するピストン - Google Patents
燃焼効率と排ガス性能とのバランスをとるように成形された燃焼ボウルを有するピストン Download PDFInfo
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Abstract
Description
Claims (10)
- 縦方向ピストン軸を規定する外側円筒面(22)と、第1の軸方向ピストン端(24)と、燃焼ボウル(30)を画定する燃焼面(28)を含む第2の軸方向ピストン端(26)であって、燃焼面(28)は内側ボウル面(34)と外側ボウル面(36)を有する複合ボウル面(32)を含む、第2の軸方向ピストン端(26)と、外側円筒面(22)に接する外側リム面(40)と複合ボウル面(32)に接する内側リム面(42)とを有する複合リム面(38)と、を含むピストン本体(20)を含む圧縮点火内燃エンジン(10)のピストン(18)であって、
燃焼面(28)はさらに、縦軸を中心とした回転のプロフィールを含む断面プロフィールを含み、回転のプロフィールはピストン(18)の燃焼効率特性とピストン(18)のNOx生成特性および煤煙生成特性とのバランスをとるように成形され、
回転のプロフィールは、内側ボウル面(34)に対応する凸湾曲セグメント(110)を画定し縦軸により二等分される複合ボウルプロフィールであって、さらに凸湾曲セグメント(110)の外側の複数の凹湾曲セグメント(112,114)を画定し外側ボウル面(36)に対応する複合ボウルプロフィールを含み、凸湾曲セグメント(110)は比較的小さな曲率半径を規定し、凹湾曲セグメント(112、114)はそれぞれ中程度の曲率半径を規定し、
回転のプロフィールはさらに、外側リム面(40)に対応する複数の線形湾曲セグメント(118)を画定しさらに内側リム面(42)に対応してそれぞれが線形湾曲セグメント(118)の1つに隣接する複数の凸湾曲セグメント(116)を画定する複合リムプロフィールを含み、複数の凸湾曲セグメント(110)はそれぞれ比較的大きな曲率半径を規定し、
燃焼面(28)はさらに、内側ボウル面(34)から外側ボウル面(36)への第1の連続遷移部(44)と、内側リム面(42)から外側リム面(40)への第2の連続遷移部(46)と、複合ボウル面(32)から複合リム面(38)への不連続な遷移部(48)と、を含む、ピストン(18)。 - 第1の連続遷移部(44)は線形遷移部を含み、第2の連続遷移部(46)は拡径遷移部(48)を含み、不連続な遷移部はバリ取りされた遷移部を含む、請求項1に記載のピストン(18)。
- 内側ボウル面(34)は、対応する凸湾曲セグメント(110)を画定するとともに、縦軸内にあり第1の軸方向位置に配置されたピーク点(130)を有する円錐突起面(34)を含み、外側リム面(40)は第2の軸方向位置に配置されたリム面を画定し、不連続な遷移部(48)は第1の軸方向位置と第2の軸方向位置間の軸方向にある第3の軸方向位置に配置され、
円錐突起面(34)は燃焼ボウル(30)の約124°〜約128°の円錐角を規定し、第1の軸方向位置から第2の軸方向位置までの軸方向距離が円錐深さを規定し、第3の軸方向位置から第2の軸方向位置までの軸方向距離が円錐深さ未満のリム深さを規定する、請求項1に記載のピストン(18)。 - リム深さは約1ミリメートル〜約3ミリメートルであり、円錐深さは約3ミリメートル以上である、請求項3に記載のピストン(18)。
- 不連続な遷移部(48)は環状の凹角突起を含む、請求項3に記載のピストン(18)。
- 15:1〜17:1の圧縮比を有する直接噴射圧縮点火内燃エンジン(19)内の燃焼効率とNOx生成および煤煙生成とのバランスをとるピストン(18、218、318、418、518、618、718、818、918)であって、エンジン(10)は1以下のスワール比と0.68〜0.74の燃焼ボウル径−シリンダボア内径比とを有し、燃料噴射噴霧角は燃焼ボウル(30、230、330、430、530、630、730、830、930)内のピストン(18、218、318、418、518、618、718、818、918)の円錐突起(31)により規定される円錐角より大きく、
ピストン(18)は、
縦方向ピストン軸を規定する外側円筒面(22)と、複合燃焼ボウル(30、230、330、430、530、630、730、830、930)を画定する燃焼面(28、228、328、428、528、628、728、828、928)を含む軸方向ピストン端(26)と、軸方向ピストン端上に配置され燃焼ボウル(30、230、330、430、530、630、730、830、930)から外側円筒表面(22)への半径方向外方に延在する複合リム(38、238、338、438、538、638、738、838、938)と、を有するピストン本体(20、220、320、420、520、620、720、820、920)を含み、
複合燃焼ボウル(30、230、330、430、530、630、730、830、930)は円錐突起(31)上に配置された凸状内側ボウル面(34)と凹状外側ボウル面(36)とを含み、複合リム(38、238、338、438、538、638、738、838、938)は外側円筒面(22)に接する平坦外側リム面(40)と複合燃焼ボウル(30、230、330、430、530、630、730、830、930)に接する凸状内側リム面(42)とを含み、
円錐角は約135°以下であり、凹状外側ボウル面(36)は7mm〜20mmの第1の曲率半径を規定し、凸状内側ボウル面(34)は凹状外側ボウル面(36)に連続的に遷移し、
凸状内側リム(42)表面は、複合燃焼ボウル(30、230、330、430、530、630、730、830、930)の縁部(80)で凹状外側ボウル面(36)に不連続に遷移し、凸状内側リム面(42)は40mm〜70mmの第2の曲率半径を規定し、これにより燃焼ボウル(30)の縁部(80)は平坦外側リム面(40)により画定される面から軸方向に凹み、ガスは、外方に狭くなるテーパーを有する隙間(82)であってピストン(18、218、318、418、518、618、718、818、918)がエンジン(10)内の上死点位置にあるときシリンダーヘッド(14)により部分的におよび複合リム(38、238、338、438、538、638、738、838、938)により部分的に画定される隙間(82)から、スキッシュされる、ピストン(18、218、318、418、518、618、718、818、918)。 - 燃焼ボウル(30、230、330、430、530、630、730、830、930)の縁部(80)は環状の凹角突起上に配置される、請求項6に記載のピストン(18、218、318、418、518、618、718、818、918)。
- 圧縮点火内燃エンジン(10)を作動する方法であって、
空気がシリンダ(15)を中心に渦巻くようにエンジン(10)のシリンダ(15)内に空気を搬送する工程と、
複合燃焼ボウル(30、230、330、430、530、630、730、830、930)を有するピストン(18、218、318、418、518、618、718、818、918)をシリンダ(15)の上死点位置に向かって進める工程であって、燃焼ボウル(30、230、330、430、530、630、730、830、930)の直径とシリンダ(15)の直径との比は0.68〜0.74であり、燃焼ボウル(30、230、330、430、530、630、730、830、930)は、7mm〜20mmの第1の曲率半径を規定する凹状外側ボウル面(34)に連続的に遷移する凸状内側ボウル面を含む、工程と、
進める工程中に、エンジン(10)のシリンダーヘッド(14)により部分的に、ピストン(18、218、318、418、518、618、718、818、918)の複合リム(38、238、338、438、538、638、738、838、938)により部分的に画定される隙間(82)からのガスをスキッシュする工程であって、複合リム(38、238、338、438、538、638、738、838、938)は平坦外側リム面(40)と40mm〜70mmの第2の曲率半径を規定する凸状内側リム面(42)とを有する、工程と、
スキッシュされたガスを複合リム(38、238、338、438、538、638、738、838、938)と複合燃焼ボウル(30、230、330、430、530、630、730、830、930)間の不連続な遷移部(48)を通じて搬送する工程と、
空気と燃料が中で自動点火するように燃料をシリンダ(15)内に直接噴射する工程と、を含む方法。 - シリンダボアを画定するエンジンハウジング(12)であって、それぞれがシリンダボアと流体連通する吸気通路(70)と排出通路(72)とを含むエンジンハウジング(12)と、
エンジンハウジング(12)に結合されたシリンダーヘッド(14)と、
シリンダーヘッド(14)内に搭載され、シリンダ(15)内に燃料を直接噴射するように構成された燃料噴射器(16)であって、噴霧角を規定する複数の噴霧オリフィスを有する、燃料噴射器(16)と、
シリンダ(15)内の燃焼効率と、燃料と空気の混合物の燃焼中のNOx生成および煤煙生成と、のバランスをとるピストン(18、218、318、418、518、618、718、818、918)であって、縦方向ピストン軸を規定する外側円筒面(22)と、複合燃焼ボウル(30、230、330、430、530、630、730、830、930)を画定する燃焼面(28、228、328、428、528、628、728、828、928)を含む軸方向ピストン端(26)と、を有するピストン本体(20、220、320、420、520、620、720、820、920)と、を含み、燃焼ボウル(30、230、330、430、530、630、730、830、930)の直径とシリンダボアの直径との比は0.68〜0.74である、ピストン(18、218、318、418、518、618、718、818、918)と、を含む直接噴射圧縮点火内燃エンジン(10)であって、
ピストン(18、218、318、418、518、618、718、818、918)はさらに、燃焼ボウル(30、230、330、430、530、630、730、830、930)内の円錐突起(31)と、燃焼ボウル(30、230、330、430、530、630、730、830、930)から外側円筒面(22)へ半径外方方向に延在する複合リム(38、238、338、438、538、638、738、838、938)と、を含み、
燃焼ボウル(30、230、330、430、530、630、730、830、930)は、円錐突起(31)上に配置された凸状内側ボウル面(34)と凹状外側ボウル面(36)とを含み、複合リム(38、238、338、438、538、638、738、838、938)は外側円筒面(22)に接する平坦外側リム面(40)と燃焼ボウル(30、230、330、430、530、630、730、830、930)に接する凸状内側リム面(42)とを含み、
円錐突起(31)は噴霧角より小さく約135°以下である円錐角を規定し、凹状外側ボウル面(36)は7mm〜20mmの第1の曲率半径を規定し、凸状内側ボウル面(34)は凹状外側ボウル面(36)に連続的に遷移し、
凸状内側リム面(42)は燃焼ボウル(30)の縁部(80)で凹状外側ボウル面(36)に不連続に遷移し、凸状内側リム面(42)は、半径外方方向に細くなるテーパーを有する隙間(82)が、ピストン(18、218、318、418、518、618、718、818、918)が上死点位置にあるときに、シリンダーヘッド(14)により部分的におよび複合リム(38、238、338、438、538、638、738、838、938)により部分的に画定されるように、40mm〜70mmの第2の曲率半径を規定する、直接噴射圧縮点火内燃エンジン(10)。 - 排出通路(72)と吸気通路(70)間を流体連結する排ガス再循環ループ(74)をさらに含む請求項9に記載のエンジン(10)。
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US13/088,659 | 2011-04-18 | ||
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US20150128899A1 (en) | 2015-05-14 |
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US20110253096A1 (en) | 2011-10-20 |
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