JP2019505729A - 空洞を有しない鋼鉄ピストン上の断熱層 - Google Patents
空洞を有しない鋼鉄ピストン上の断熱層 Download PDFInfo
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- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
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Abstract
Description
この出願は、2016年2月22日に提出された米国仮特許出願第62/298,024号および2017年2月20日に提出された米国特許出願第15/436,966号の利益を主張し、参照によりその内容全体がここに組み込まれる。
1.技術分野
この発明は、概して、内燃機関のためのピストン、およびピストンを製造する方法に関する。
エンジン製造者は、限定されないが、燃料経済を向上させること、オイル消費を低減すること、燃料システムを向上させること、圧縮負荷およびシリンダボア内の動作温度を上昇させること、ピストンを通じた熱損失を低減すること、構成部品の潤滑を向上させること、エンジン重量を減らすこと、およびエンジンをよりコンパクトにすることと同時に、製造に関わるコストを減らすことなど、エンジンの効率および性能を向上させるための増加する要求に直面している。
本発明の1つの局面は、熱効率、燃料消費、およびエンジンの性能を向上させるために設計される内燃機関のための空洞なしの鋼鉄ピストンを提供する。ピストンは、鋼鉄で形成される本体部分を含む。本体部分は下方クラウン表面を含む上壁を含み、下方クラウン表面はピストンの下側から見たときに露出しており、上壁は下方クラウン表面の反対側の上部燃焼表面を含む。リングベルトは、上壁から垂下し、ピストンの中心長手方向軸の周りに周方向に延在し、一対のピンボスは上壁から垂下し、一対のスカートパネルは、リングベルトから垂下し、ピンボスに連結される。熱障壁層は、上部燃焼表面の少なくとも一部および/またはリングベルトの少なくとも一部に適用されて燃焼室からの熱がピストンの鋼鉄本体部分に入るのを防止し、熱障壁層は本体部分の鋼鉄の熱伝導率よりも低い熱伝導率を有する。
図1および図2は、たとえば現代のコンパクトな高性能車両エンジンなどの内燃機関のシリンダボアまたはチャンバ(図示せず)における往復運動のための、本発明の例示の実施形態に従って構築されるピストン10の図を示す。図3に示されるように、断熱層とも呼ばれる熱障壁層12は、ピストン10の上部燃焼表面16に適用されて熱効率、燃料消費およびエンジンの性能を向上させる。
Claims (20)
- 空洞なしのピストンであって、
鋼鉄で形成される本体部分を備え、
前記本体部分は、下方クラウン表面を含む上壁を含み、
前記下方クラウン表面は、前記ピストンの下側から見たときに露出しており、
前記上壁は、前記下方クラウン表面の反対側の上部燃焼表面を含み、前記空洞なしのピストンは、
前記上壁から垂下し、前記ピストンの中心長手方向軸の周りに周方向に延在するリングベルトと、
前記上壁から垂下する一対のピンボスと、
前記リングベルトから垂下し、前記ピンボスに連結される一対のスカートパネルと、
前記上部燃焼表面の少なくとも一部および/または前記リングベルトの少なくとも一部に適用される熱障壁層とを備え、前記熱障壁層は、前記本体部分の前記鋼鉄の熱伝導率よりも低い熱伝導率を有する、空洞なしのピストン。 - 前記熱障壁層は、セラミック材料を含む、請求項1に記載の空洞なしのピストン。
- 前記熱障壁層の前記セラミック材料は、セリア、セリア安定化ジルコニア、およびセリア安定化ジルコニアとイットリア安定化ジルコニアの混合物のうちの少なくとも1つを含む、請求項2に記載の空洞なしのピストン。
- 前記熱障壁層の前記セラミック材料は、前記セラミック材料の総重量に基づいて90〜100重量%の量のセリアを含む、請求項3に記載の空洞なしのピストン。
- 前記セラミック材料の前記セリアは、21℃で10E−6〜11E−6の範囲にある熱膨張係数を有し、前記本体部分の前記鋼鉄は、21℃で11E−6〜14E−6の範囲にある熱膨張係数を有する、請求項4に記載の空洞なしのピストン。
- 前記熱障壁層の前記セラミック材料は、前記セラミック材料の総重量に基づいて90〜100重量%の量のセリア安定化ジルコニアを含む、請求項3に記載の空洞なしのピストン。
- 前記熱障壁層の前記セラミック材料は、前記セラミック材料の総重量に基づいて90〜100重量%の量のセリア/イットリア安定化ジルコニアを含む、請求項3に記載の空洞なしのピストン。
- 前記セラミック材料は、1W/m・K未満の熱伝導率を有する、請求項3に記載の空洞なしのピストン。
- 前記熱障壁層は、勾配構造を有する、請求項1に記載の空洞なしのピストン。
- 前記熱障壁層は、前記上部燃焼表面および/または前記リングベルトに適用される金属結合材料を含み、前記熱障壁層は、前記熱障壁層の総重量に基づいて100重量%の前記金属結合材料から100重量%のセラミック材料まで徐々に遷移し、前記熱障壁層の最も上側の部分は、全体的に前記セラミック材料で形成されている、請求項9に記載の空洞なしのピストン。
- 前記セラミック材料は、セリア、セリア安定化ジルコニア、およびセリア安定化ジルコニアとイットリア安定化ジルコニアの混合物のうちの少なくとも1つを含み、前記金属結合材料は、鋼鉄または超合金を含む、請求項10に記載の空洞なしのピストン。
- 前記金属結合材料は、前記金属結合材料の総重量に基づいて100重量%の量の金属からなり、前記セラミック材料は、前記セラミック材料の総重量に基づいて100重量%の量のセラミックからなり、前記熱障壁層は、前記金属結合材料および前記セラミック材料のみからなる、請求項10に記載の空洞なしのピストン。
- 前記熱障壁層は、500ミクロン未満の厚さを有する、請求項1に記載の空洞なしのピストン。
- 前記本体部分は、前記鋼鉄の単一片で形成されており、複数のストラットが前記スカートパネルを前記ピンボスに連結し、前記本体部分は、前記下方クラウン表面に沿って延在し、かつ前記スカートパネルおよび前記ストラットおよび前記ピンボスに取り囲まれる内側下方クラウン領域を提示し、一対の下方クラウンポケットが前記下方クラウン表面に沿って延在し、各下方クラウンポケットは、前記ピンボスのうちの1つおよび前記スカートパネルのうちの1つおよび1つの前記ピンボスを1つの前記スカートパネルに連結する前記ストラットに取り囲まれ、前記本体部分は、冷却空洞床、または前記下方クラウン表面に沿って冷却空洞を画定するまたは部分的に画定する他の構成を有しない、請求項1に記載の空洞なしのピストン。
- 前記本体部分は、前記鋼鉄の単一片で形成されており、
前記鋼鉄は、21℃で11E−6〜14E−6の範囲にある熱膨張係数を有し、
複数のストラットが前記スカートパネルを前記ピンボスに連結し、
前記本体部分は、前記下方クラウン表面に沿って延在し、かつ前記スカートパネルおよび前記ストラットおよび前記ピンボスに取り囲まれる内側下方クラウン領域を提示し、
一対の下方クラウンポケットが前記下方クラウン表面に沿って延在し、
各下方クラウンポケットは、前記ピンボスのうちの1つおよび前記スカートパネルのうちの1つおよび1つの前記ピンボスを1つの前記スカートパネルに連結する前記ストラットに取り囲まれ、
前記本体部分は、冷却空洞床、または前記下方クラウン表面に沿って冷却空洞を画定するまたは部分的に画定する他の構成を有さず、
前記上部燃焼表面は、前記上壁の外周に沿って延在する実質的に平面の表面として形成される環状の第1部分と、燃焼ボウルを形成する第2部分とを含み、
前記上部燃焼表面の前記第2部分は、前記第1部分から垂下する非平面の、凹状のまたは波状の表面を有し、
前記リングベルトは、上部ランドと、1つ以上の対応するピストンリングの受容のための複数のリング溝とを含み、
前記上部ランドは、前記上部燃焼表面から前記リング溝の最も上側のものまで延在し、
前記ピンボスは各々、ピンボアを有し、
前記ピンボアは各々、凹状である最上面を有し、
前記下方クラウンポケットは、前記ピンボスの径方向外側に位置し、
各下方クラウンポケットの少なくとも一部は、前記下方クラウン表面の一部を形成し、
前記ピンボスおよび前記スカートパネルおよび前記ストラットは、前記ストラットの最も下側の表面および前記スカートパネルから前記下方クラウン表面まで延在する前記内側下方クラウン領域を画定し、
対向する前記スカートパネルと対向する前記ピンボスとの間に配置される前記下方クラウンの少なくとも中央部分は、前記ピストンの前記下側から見たときに凹状であり、
前記熱障壁層は、前記上部燃焼表面のすべて、および前記リングベルトの前記上部ランドに適用され、
前記熱障壁層は、500ミクロン未満の厚さを有し、
前記熱障壁層は、セラミック材料を含み、
前記熱障壁層の前記セラミック材料は、前記セラミック材料の総重量に基づいて90〜100重量%の量で、セリア、セリア安定化ジルコニア、およびセリア安定化ジルコニアとイットリア安定化ジルコニアの混合物のうちの少なくとも1つを含み、
前記セラミック材料は、1W/m・K未満の熱伝導率を有し、
前記セラミック材料の前記セリアは、21℃で10E−6〜11E−6の範囲にある熱膨張係数を有し、
前記熱障壁層は、勾配構造を有し、
前記熱障壁層は、前記上部燃焼表面および前記上部ランドに適用される金属結合材料を含み、
前記金属結合材料は、鋼鉄または超合金を含み、
前記熱障壁層は、前記熱障壁層の総重量に基づいて100重量%の前記金属結合材料から100重量%の前記セラミック材料まで徐々に遷移し、
前記熱障壁層の最も上側の部分は、全体的に前記セラミック材料で形成されている、請求項1に記載の空洞なしのピストン。 - 熱障壁層を上部燃焼表面の少なくとも一部および/またはピストンの本体部分のリングベルトの少なくとも一部に適用することを備え、前記ピストンの前記本体部分は、鋼鉄で形成され、前記熱障壁層は、前記本体部分の前記鋼鉄の熱伝導率よりも低い熱伝導率を有し、
前記本体部分は、前記上部燃焼表面と、前記ピストンの下側から露出する下方クラウン表面とを含む上壁を含み、前記リングベルトは、前記上壁から垂下し、前記ピストンの中心長手方向軸の周りに周方向に延在し、一対のピンボスが前記上壁から垂下し、一対のスカートパネルが前記リングベルトから垂下し、前記ピンボスに連結される、空洞なしのピストンを製造する方法。 - 前記熱障壁層を適用するステップは、溶射、めっき、または鋳造を含む、請求項16に記載の方法。
- 前記熱障壁層を適用するステップは、熱溶射を含む、請求項17に記載の方法。
- 前記熱溶射のステップは、プラズマ溶射または高速酸素燃料(HVOF)溶射を含む、請求項18に記載の方法。
- 前記熱障壁層を適用するステップは、前記熱障壁層を前記上部燃焼表面のすべてに、および前記リングベルトの上部ランドに適用することを含み、
前記熱障壁層を適用するステップは、熱溶射を含み、
前記熱溶射のステップは、プラズマ溶射または高速酸素燃料(HVOF)溶射を含み、
前記熱溶射のステップは、まず前記上部燃焼表面上の前記熱障壁層の総重量に基づいて100重量%の量の金属結合材料および0重量%の量のセラミック材料を溶射し、次いで前記熱障壁層の組成が前記熱障壁層の総重量に基づいて100重量%のセラミック材料になり、前記熱障壁層の最も上側の部分が全体的に前記セラミック材料で形成されるまで、前記金属結合材料に対して増加する量で前記セラミック材料を溶射することによって、勾配構造を形成することを含み、
前記熱溶射のステップは、500ミクロン未満の厚さまで前記熱障壁層を適用することを含み、
前記方法は、前記熱障壁層を適用する前に、前記上部燃焼表面および/または前記上部ランドの少なくとも一部を加工してポケット、凹部、丸みを帯びた縁部および/または面取り部を形成することをさらに含み、
前記方法は、21℃で11E−6〜14E−6の範囲にある熱膨張係数を有する前記鋼鉄の単一片で形成される前記本体部分を提供することをさらに含み、
前記本体部分は、前記スカートパネルを前記ピンボスに連結する複数のストラットを含み、前記本体部分は、前記下方クラウン表面に沿って延在し、かつ前記スカートパネルおよび前記ストラットおよび前記ピンボスに取り囲まれる内側下方クラウン領域を提示し、一対の下方クラウンポケットが前記下方クラウン表面に沿って延在し、各下方クラウンポケットは、前記ピンボスのうちの1つおよび前記スカートパネルのうちの1つおよび1つの前記ピンボスを1つの前記スカートパネルに連結する前記ストラットに取り囲まれ、前記本体部分は、冷却空洞床、または前記下方クラウン表面に沿って冷却空洞を画定するまたは部分的に画定する他の構成を有さず、前記上部燃焼表面は、前記上壁の外周に沿って延在する実質的に平面の表面として形成される環状の第1部分と、燃焼ボウルを形成する第2部分とを含み、前記上部燃焼表面の前記第2部分は、前記第1部分から垂下する非平面の、凹状のまたは波状の表面を有し、前記リングベルトは、1つ以上の対応するピストンリングの受容のための複数のリング溝を含み、前記上部ランドは、前記上部燃焼表面から前記リング溝の第1のものまで延在し、前記ピンボスは各々、ピンボアを有し、前記ピンボアは各々、凹状である最上面を有し、前記下方クラウンポケットは、前記ピンボスの径方向外側に位置し、各下方クラウンポケットの少なくとも一部は、前記下方クラウン表面の一部を形成し、前記ピンボスおよび前記スカートパネルおよび前記ストラットは、前記ストラットの最も下側の表面および前記スカートパネルから前記下方クラウン表面まで延在する前記内側下方クラウン領域を画定し、対向する前記スカートパネルと対向する前記ピンボスとの間に配置される前記下方クラウン表面の少なくとも中央部分は、前記ピストンの前記下側から見たときに凹状であり、
前記本体部分を提供するステップは、鍛造または鋳造によって材料の前記単一片を形成することを含み、
前記熱障壁層の前記セラミック材料は、前記セラミック材料の総重量に基づいて90〜100重量%の量で、セリア、セリア安定化ジルコニア、およびセリア安定化ジルコニアとイットリア安定化ジルコニアの混合物のうちの少なくとも1つを含み、前記セラミック材料は、1W/m・K未満の熱伝導率を有し、前記セラミック材料の前記セリアは、21℃で10E−6〜11E−6の範囲にある熱膨張係数を有し、
前記熱障壁層の前記金属結合材料は、鋼鉄または超合金を含む、請求項16に記載の方法。
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CN109072810B (zh) | 2021-05-25 |
EP3420215B1 (en) | 2021-11-17 |
US10273902B2 (en) | 2019-04-30 |
BR112018016886A2 (pt) | 2019-02-05 |
US20190211774A1 (en) | 2019-07-11 |
CN109072810A (zh) | 2018-12-21 |
EP3420215A1 (en) | 2019-01-02 |
WO2017147031A1 (en) | 2017-08-31 |
KR20180115698A (ko) | 2018-10-23 |
US20170241371A1 (en) | 2017-08-24 |
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