JP2019167876A - Internal combustion engine - Google Patents

Internal combustion engine Download PDF

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JP2019167876A
JP2019167876A JP2018056373A JP2018056373A JP2019167876A JP 2019167876 A JP2019167876 A JP 2019167876A JP 2018056373 A JP2018056373 A JP 2018056373A JP 2018056373 A JP2018056373 A JP 2018056373A JP 2019167876 A JP2019167876 A JP 2019167876A
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mounting hole
combustion chamber
thread
attachment hole
component mounting
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JP7110654B2 (en
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善春 千野
Yoshiharu Chino
善春 千野
篤史 駒田
Atsushi Komada
篤史 駒田
邦彦 坂田
Kunihiko Sakata
邦彦 坂田
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Toyota Motor Corp
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Toyota Motor Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Abstract

To provide an internal combustion engine which can suppress a stress concentration of a cylinder head.SOLUTION: An internal combustion engine comprises: a cylinder head having a combustion chamber ceiling face constituting a combustion chamber, and a part attachment hole extending so as to arrive at the combustion chamber ceiling face, and having an attachment hole screw thread at an internal peripheral face; and an ignition plug assembled into the part attachment hole, and having a plug screw thread which is engaged with the attachment hole screw thread. A screw thread piece nearest the combustion chamber ceiling face out of the attachment hole screw thread formed at the part attachment hole, and a screw thread piece existing at a tip of the ignition plug out of the plug screw thread of the ignition plug are engaged with each other. The combustion chamber ceiling face includes a peripheral edge face surrounding the part attachment hole. The peripheral edge face is a plane vertical to a center axis of the part attachment hole. An edge of the part attachment hole at the peripheral edge face is chamfered.SELECTED DRAWING: Figure 4

Description

本発明は、内燃機関に関するものである。   The present invention relates to an internal combustion engine.

従来、例えば特開２０１５−２２５７７４号公報に開示されているように、点火プラグ装着穴の燃焼室側先端までネジ山を切って、点火プラグを装着した内燃機関が知られている。   2. Description of the Related Art Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2015-225774, there is known an internal combustion engine in which a spark plug is mounted by cutting a thread to the tip of a spark plug mounting hole on the combustion chamber side.

特開２０１５−２２５７７４号公報Japanese Patent Laying-Open No. 2015-225774 特開２００９−０９７７１０号公報JP 2009-097710 A 特開２００４−２３２４７８号公報JP 2004-232478 A

点火プラグを装着する部品装着穴は、シリンダヘッドの燃焼室天井面に連通している。上記の従来の技術では、部品装着穴の燃焼室側先端までネジ山があるので、このネジ山が燃焼室に露出する。燃焼室に露出したネジ山は、高温になりやすい。高温環境によって燃焼室側先端のネジ山に応力集中が起き、シリンダヘッドの応力集中が発生してしまうという問題がある。   The component mounting hole for mounting the spark plug communicates with the combustion chamber ceiling surface of the cylinder head. In the conventional technique described above, since there is a screw thread up to the combustion chamber side tip of the component mounting hole, this screw thread is exposed to the combustion chamber. The threads exposed in the combustion chamber are likely to be hot. There is a problem that stress concentration occurs in the thread at the tip of the combustion chamber due to a high temperature environment, and stress concentration in the cylinder head occurs.

本発明は、上述のような課題を解決するためになされたもので、シリンダヘッドの応力集中を抑制することができる内燃機関を提供することを目的とする。   The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an internal combustion engine that can suppress stress concentration in a cylinder head.

本発明にかかる内燃機関は、
燃焼室を構成する燃焼室天井面と、前記燃焼室天井面に達するように伸び内周面に装着穴ネジ山を持つ部品装着穴と、を有するシリンダヘッドと、
前記部品装着穴に組み付けられ、前記装着穴ネジ山と噛み合わされたプラグネジ山を持つ点火プラグと、
を備え、
前記部品装着穴に設けた前記装着穴ネジ山のうち前記燃焼室天井面に近い側の先端の第一先端ネジ山片と、前記点火プラグの前記プラグネジ山のうち前記点火プラグの先端にある第二先端ネジ山片とが噛み合わされ、
前記燃焼室天井面は、前記部品装着穴を囲む周縁面を含み、
前記周縁面は、前記部品装着穴の中心軸に対して垂直な平面であり、
前記周縁面における前記部品装着穴の縁が面取りされている。 An internal combustion engine according to the present invention is
A cylinder head having a combustion chamber ceiling surface constituting a combustion chamber, and a component mounting hole extending to reach the combustion chamber ceiling surface and having a mounting hole thread on an inner peripheral surface;
A spark plug having a plug thread assembled to the component mounting hole and meshed with the mounting hole thread;
With
Among the mounting hole threads provided in the component mounting hole, a first tip thread piece at a tip closer to the combustion chamber ceiling surface and a first thread piece at the tip of the spark plug among the plug threads of the spark plug. The two-end thread piece is engaged,
The combustion chamber ceiling surface includes a peripheral surface surrounding the component mounting hole,
The peripheral surface is a plane perpendicular to the central axis of the component mounting hole,
The edge of the component mounting hole on the peripheral surface is chamfered.

本発明によれば、装着穴ネジ山の第一先端ネジ山片とプラグネジ山の第二先端ネジ山片とが噛み合わされることで、余分なネジ山が燃焼室に露出しない。周縁面が部品装着穴の中心軸に対して垂直なので、周縁面がくぼんでいない。従って、内燃機関作動中における周縁面付近の応力を緩和することができる。さらに部品装着穴の縁を面取りすることにより応力集中箇所を減らすことができる。   According to the present invention, the first tip thread piece of the mounting hole thread and the second tip thread piece of the plug thread are engaged with each other, so that no excess thread is exposed to the combustion chamber. Since the peripheral surface is perpendicular to the central axis of the component mounting hole, the peripheral surface is not recessed. Therefore, the stress near the peripheral surface during operation of the internal combustion engine can be relaxed. Furthermore, stress concentration points can be reduced by chamfering the edge of the component mounting hole.

実施の形態にかかる内燃機関の断面図である。1 is a cross-sectional view of an internal combustion engine according to an embodiment. 実施の形態にかかる内燃機関の拡大断面図である。It is an expanded sectional view of the internal combustion engine concerning an embodiment. 実施の形態にかかる内燃機関の燃焼室天井面を図示した斜視図である。It is the perspective view which illustrated the combustion chamber ceiling surface of the internal combustion engine concerning embodiment. 実施の形態にかかる内燃機関の拡大断面図である。It is an expanded sectional view of the internal combustion engine concerning an embodiment. 実施の形態に対する比較例にかかる内燃機関の拡大断面図である。It is an expanded sectional view of the internal combustion engine concerning the comparative example with respect to embodiment. 実施の形態の変形例にかかる内燃機関の拡大断面図である。It is an expanded sectional view of the internal combustion engine concerning the modification of embodiment. 実施の形態にかかる内燃機関のウォータージャケットを模式的に図示した斜視図である。1 is a perspective view schematically showing a water jacket of an internal combustion engine according to an embodiment.

図１は、実施の形態にかかる内燃機関１０の断面図である。図２は、実施の形態にかかる内燃機関１０の拡大断面図であり、燃焼室天井面２２を拡大したものである。図３は、実施の形態にかかる内燃機関１０の燃焼室天井面２２を図示した斜視図である。図２は図３のＡ−Ａ線に沿って内燃機関１０を切断したときの断面を表している。図４は、実施の形態にかかる内燃機関１０の拡大断面図である。   FIG. 1 is a cross-sectional view of an internal combustion engine 10 according to an embodiment. FIG. 2 is an enlarged sectional view of the internal combustion engine 10 according to the embodiment, in which the combustion chamber ceiling surface 22 is enlarged. FIG. 3 is a perspective view illustrating the combustion chamber ceiling surface 22 of the internal combustion engine 10 according to the embodiment. FIG. 2 shows a cross section when the internal combustion engine 10 is cut along the line AA in FIG. FIG. 4 is an enlarged cross-sectional view of the internal combustion engine 10 according to the embodiment.

図１に示すように、内燃機関１０は、シリンダヘッド２０と、点火プラグ３０と、直噴インジェクタ４０と、を備えている。図２に示すように、シリンダヘッド２０は、燃焼室を構成する燃焼室天井面２２と、燃焼室天井面２２に達するように伸びる部品装着穴２２ｄおよびインジェクタ装着穴２２ｅと、を有する。   As shown in FIG. 1, the internal combustion engine 10 includes a cylinder head 20, a spark plug 30, and a direct injection injector 40. As shown in FIG. 2, the cylinder head 20 has a combustion chamber ceiling surface 22 that constitutes a combustion chamber, and a component mounting hole 22 d and an injector mounting hole 22 e that extend to reach the combustion chamber ceiling surface 22.

図４に示すように、部品装着穴２２ｄの内周面には、装着穴ネジ山２２ｄ１が設けられている。点火プラグ３０は、部品装着穴２２ｄに組み付けられている。点火プラグ３０は、装着穴ネジ山２２ｄ１と噛み合わされたプラグネジ山３２ｃを持つ。装着穴ネジ山２２ｄ１のうち最も燃焼室天井面２２に近い先端ネジ山片と、プラグネジ山３２ｃのうち点火プラグ３０のもっとも先端寄りにある先端ネジ山片とが噛み合わされている。直噴インジェクタ４０は、インジェクタ装着穴２２ｅに挿入されている。直噴インジェクタ４０のノズル先端部と点火プラグ３０のプラグ先端部は、燃焼室天井面２２の中央で互いに近接している。   As shown in FIG. 4, a mounting hole thread 22d1 is provided on the inner peripheral surface of the component mounting hole 22d. The spark plug 30 is assembled in the component mounting hole 22d. The spark plug 30 has a plug thread 32c meshed with the mounting hole thread 22d1. A tip thread piece closest to the combustion chamber ceiling surface 22 in the mounting hole thread 22d1 and a tip thread piece closest to the tip of the spark plug 30 in the plug screw thread 32c are engaged with each other. The direct injection injector 40 is inserted into the injector mounting hole 22e. The nozzle tip of the direct injection injector 40 and the plug tip of the spark plug 30 are close to each other at the center of the combustion chamber ceiling surface 22.

図２および図３に示すように、燃焼室天井面２２は、部品装着穴２２ｄを囲む周縁面２２ａを含んでいる。なお、燃焼室天井面２２には、二つの吸気ポート２３と二つの排気ポート２４とが連通している。二つの吸気ポート２３と二つの排気ポート２４は、部品装着穴２２ｄおよびインジェクタ装着穴２２ｅを囲むように並んでいる。   As shown in FIGS. 2 and 3, the combustion chamber ceiling surface 22 includes a peripheral surface 22a surrounding the component mounting hole 22d. Note that two intake ports 23 and two exhaust ports 24 communicate with the combustion chamber ceiling surface 22. The two intake ports 23 and the two exhaust ports 24 are arranged so as to surround the component mounting hole 22d and the injector mounting hole 22e.

図４に示すように、部品装着穴２２ｄは中心軸Ａｈを持っている。図４にはこの中心軸Ａｈと垂直に交わる仮想平面Ｓｐが図示されている。図４に示すように、周縁面２２ａは、部品装着穴２２ｄの中心軸Ａｈに対して垂直な平面を有する。周縁面２２ａは、仮想平面Ｓｐと平行な部分を持つ。   As shown in FIG. 4, the component mounting hole 22d has a central axis Ah. FIG. 4 shows a virtual plane Sp perpendicular to the central axis Ah. As shown in FIG. 4, the peripheral surface 22a has a plane perpendicular to the central axis Ah of the component mounting hole 22d. The peripheral surface 22a has a portion parallel to the virtual plane Sp.

図４に示すように、周縁面２２ａにおける部品装着穴２２ｄの縁が面取りされることで、面取部２２ｇが設けられている。また、点火プラグ３０の燃焼室側口元をザグリ加工した加工部３２ｂが設けられている。加工部３２ｂはプラグネジ山３２ｃが設けられていないので、応力を緩和することができる。点火プラグ３０の雄ネジがかかっていない部分のみを加工することが好ましい。寸法Ｄ１で表したように、点火プラグ３０の雄ネジ部分まで、ネジ山が削り落とされている。   As shown in FIG. 4, the edge of the component mounting hole 22d on the peripheral surface 22a is chamfered to provide a chamfered portion 22g. Further, a processing portion 32b is provided in which the mouth of the ignition plug 30 on the combustion chamber side is counterbored. Since the processed portion 32b is not provided with the plug thread 32c, the stress can be relieved. It is preferable to process only the portion of the spark plug 30 that is not threaded. As represented by the dimension D1, the thread is cut off to the male screw portion of the spark plug 30.

図４に示すように、シリンダヘッド２０の部品装着穴２２ｄの燃焼室側端部も、装着穴ネジ山２２ｄ１が切り落とされている。シリンダヘッド２０の雌ネジの谷の径にあわせて、燃焼室側から追加工することで装着穴ネジ山２２ｄ１の一部が切り落とされている。この追加工により、部品装着穴２２ｄにおける燃焼室天井面２２の先端部には凹凸の無い面が設けられている。   As shown in FIG. 4, the mounting hole thread 22 d 1 is also cut off at the combustion chamber side end of the component mounting hole 22 d of the cylinder head 20. A part of the mounting hole thread 22d1 is cut off by performing additional machining from the combustion chamber side in accordance with the diameter of the valley of the female thread of the cylinder head 20. By this additional work, a surface having no unevenness is provided at the tip of the combustion chamber ceiling surface 22 in the component mounting hole 22d.

図５は、実施の形態に対する比較例にかかる内燃機関１０の拡大断面図である。図５の比較例では、装着穴ネジ山２２ｄ１およびプラグネジ山３２ｃの両方が、部品装着穴２２ｄの燃焼室側先端まで設けられている。センタ噴射配置により部品間の距離が近づけられると、点火プラグ３０の周りのシリンダヘッド２０の肉が薄くなりやすい。燃焼室側は温度が高く、燃焼圧による荷重も大きい。仮にネジ山が燃焼室天井面２２へと露出してしまうと、ネジの山谷形状による応力集中により信頼性の低下が心配される。   FIG. 5 is an enlarged cross-sectional view of an internal combustion engine 10 according to a comparative example with respect to the embodiment. In the comparative example of FIG. 5, both the mounting hole thread 22d1 and the plug thread 32c are provided up to the combustion chamber side tip of the component mounting hole 22d. When the distance between the parts is reduced by the center injection arrangement, the thickness of the cylinder head 20 around the spark plug 30 tends to be thin. The temperature on the combustion chamber side is high, and the load due to the combustion pressure is large. If the screw thread is exposed to the combustion chamber ceiling surface 22, there is a concern that the reliability is lowered due to the stress concentration due to the thread valley shape.

この点、実施の形態によれば、次のような利点がある。まず、装着穴ネジ山２２ｄ１の先端ネジ山片とプラグネジ山３２ｃの先端ネジ山片とが噛み合わされることで余分なネジ山が燃焼室に露出しない。また、燃焼室天井面２２における周縁面２２ａが、部品装着穴２２ｄの中心軸Ａｈに対して垂直である。つまり周縁面２２ａがくぼんでいない。部品装着穴２２ｄの周辺が凹んでいると応力集中が起きやすいのに対し、実施の形態では部品装着穴２２ｄに対して垂直となるように周縁面２２ａを設けているので内燃機関１０の作動中における周縁面２２ａ付近の応力を緩和することができる。   In this respect, the embodiment has the following advantages. First, the tip thread piece of the mounting hole thread 22d1 and the tip thread piece of the plug screw thread 32c are engaged with each other, so that no extra thread is exposed to the combustion chamber. Further, the peripheral surface 22a of the combustion chamber ceiling surface 22 is perpendicular to the central axis Ah of the component mounting hole 22d. That is, the peripheral surface 22a is not recessed. When the periphery of the component mounting hole 22d is recessed, stress concentration tends to occur. In the embodiment, the peripheral surface 22a is provided so as to be perpendicular to the component mounting hole 22d. The stress in the vicinity of the peripheral surface 22a can be relaxed.

さらに、実施の形態によれば、部品装着穴２２ｄの縁に面取部２２ｇを設けることにより、シリンダヘッド２０の応力集中箇所をなくすことができる。シリンダヘッド２０のうち肉厚が薄く強度が比較的弱い部分において、ネジ山露出による応力集中が発生しないので、製品強度が向上する効果がある。燃費、排気、出力性能を維持したままで、信頼性を向上できる効果がある。   Furthermore, according to the embodiment, by providing the chamfered portion 22g at the edge of the component mounting hole 22d, it is possible to eliminate the stress concentration portion of the cylinder head 20. In the cylinder head 20 where the wall thickness is thin and the strength is relatively weak, stress concentration due to screw exposure does not occur, so that the product strength is improved. It has the effect of improving reliability while maintaining fuel efficiency, exhaust and output performance.

なお、仮に面取部２２ｇが設けられないと、せっかくネジの山谷部を加工してもピン角形状が出来てしまうので、応力集中が起きてしまうおそれがある。この点、実施の形態では、面取部２２ｇによって応力集中を確実に抑制することができる。   If the chamfered portion 22g is not provided, a pin angle shape can be formed even if the crest and trough portions of the screw are processed, and stress concentration may occur. In this regard, in the embodiment, the stress concentration can be reliably suppressed by the chamfered portion 22g.

点火プラグ３０でなく、燃焼圧センサあるいはプラズマ発生器が取り付けられてもよい。雄ネジがかからない部分は、最初からネジのタップを切らないようにしてもよい。   A combustion pressure sensor or a plasma generator may be attached instead of the spark plug 30. The portion where the male screw is not applied may not be tapped from the beginning.

図６は、実施の形態の変形例にかかる内燃機関１０の拡大断面図である。図１〜図４に示した実施の形態では部品装着穴２２ｄにネジのタップを切った後に、燃焼室側から装着穴ネジ山２２ｄ１を削るようにしている。これに対し、図６に示す変形例では、部品装着穴２２ｄのネジのタップを上部から途中まで加工して、貫通しないように途中で止めている。   FIG. 6 is an enlarged cross-sectional view of the internal combustion engine 10 according to a modified example of the embodiment. In the embodiment shown in FIGS. 1 to 4, the mounting hole thread 22 d 1 is cut from the combustion chamber side after a screw tap is cut in the component mounting hole 22 d. On the other hand, in the modified example shown in FIG. 6, the screw tap of the component mounting hole 22d is processed from the upper part to the middle and stopped so as not to penetrate.

図６において、点火プラグ３０の雄ねじ部Ｄ２よりもその下方部分Ｄ３まで装着穴ネジ山２２ｄ１を切っておくことが好ましい。さもないと点火プラグ３０が部品装着穴２２ｄの雌ネジの不完全なネジ部に乗り上げる恐れがあるからである。ただし、図６の変形例ではネジの山谷部が残ることになり、応力集中部位が残存することになるので、図１〜図４の実施の形態のほうがより高い信頼性を得ることができる。   In FIG. 6, it is preferable to cut the mounting hole thread 22d1 from the male screw part D2 of the spark plug 30 to the lower part D3. Otherwise, the spark plug 30 may ride on an incomplete thread portion of the female screw of the component mounting hole 22d. However, in the modified example of FIG. 6, the crests and valleys of the screw remain, and the stress concentration part remains, so that the embodiment of FIGS. 1 to 4 can obtain higher reliability.

図７は、実施の形態にかかる内燃機関１０のウォータージャケット５０を模式的に図示した斜視図である。実施の形態では、燃焼室を積極的に冷却するために、上段ウォータージャケット５２と下段ウォータージャケット５４を含む二段ウォータージャケットを採用している。これにより点火プラグ３０のネジ部からシリンダヘッド２０への熱伝達性能を向上し、点火プラグ３０の温度を下げてプレイグニッションの発生を抑制することができる。ネジの山谷部を加工することで、シリンダヘッド２０が受熱する面積を低減することができ、シリンダヘッド２０の壁温を低下させることができる。   FIG. 7 is a perspective view schematically showing the water jacket 50 of the internal combustion engine 10 according to the embodiment. In the embodiment, a two-stage water jacket including an upper water jacket 52 and a lower water jacket 54 is employed to actively cool the combustion chamber. Thereby, the heat transfer performance from the threaded portion of the spark plug 30 to the cylinder head 20 can be improved, and the temperature of the spark plug 30 can be lowered to suppress the occurrence of pre-ignition. By processing the crests and valleys of the screw, the area received by the cylinder head 20 can be reduced, and the wall temperature of the cylinder head 20 can be lowered.

１０ 内燃機関
２０ シリンダヘッド
２２ 燃焼室天井面
２２ａ 周縁面
２２ｄ 部品装着穴
２２ｄ１ 装着穴ネジ山
２２ｅ インジェクタ装着穴
２２ｇ 面取部
２３ 吸気ポート
２４ 排気ポート
３０ 点火プラグ
３２ｂ 加工部
３２ｃ プラグネジ山
４０ 直噴インジェクタ
５０ ウォータージャケット
５２ 上段ウォータージャケット
５４ 下段ウォータージャケット
Ａｈ 中心軸
Ｓｐ 仮想平面 DESCRIPTION OF SYMBOLS 10 Internal combustion engine 20 Cylinder head 22 Combustion chamber ceiling surface 22a Peripheral surface 22d Component mounting hole 22d1 Mounting hole screw thread 22e Injector mounting hole 22g Chamfer 23 Intake port 24 Exhaust port 30 Spark plug 32b Processing part 32c Plug screw thread 40 Direct injection injector 50 Water jacket 52 Upper water jacket 54 Lower water jacket Ah Center axis Sp Virtual plane

Claims (1)

燃焼室を構成する燃焼室天井面と、前記燃焼室天井面に達するように伸び内周面に装着穴ネジ山を持つ部品装着穴と、を有するシリンダヘッドと、
前記部品装着穴に組み付けられ、前記装着穴ネジ山と噛み合わされたプラグネジ山を持つ点火プラグと、
を備え、
前記部品装着穴に設けた前記装着穴ネジ山のうち前記燃焼室天井面に近い側の先端の第一先端ネジ山片と、前記点火プラグの前記プラグネジ山のうち前記点火プラグの先端にある第二先端ネジ山片とが噛み合わされ、
前記燃焼室天井面は、前記部品装着穴を囲む周縁面を含み、
前記周縁面は、前記部品装着穴の中心軸に対して垂直な平面であり、
前記周縁面における前記部品装着穴の縁が面取りされている内燃機関。 A cylinder head having a combustion chamber ceiling surface constituting a combustion chamber, and a component mounting hole extending to reach the combustion chamber ceiling surface and having a mounting hole thread on an inner peripheral surface;
A spark plug having a plug thread assembled to the component mounting hole and meshed with the mounting hole thread;
With
Among the mounting hole threads provided in the component mounting hole, a first tip thread piece at a tip closer to the combustion chamber ceiling surface and a first thread piece at the tip of the spark plug among the plug threads of the spark plug. The two-end thread piece is engaged,
The combustion chamber ceiling surface includes a peripheral surface surrounding the component mounting hole,
The peripheral surface is a plane perpendicular to the central axis of the component mounting hole,
An internal combustion engine in which an edge of the component mounting hole on the peripheral surface is chamfered.
JP2018056373A 2018-03-23 2018-03-23 internal combustion engine Active JP7110654B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021092203A (en) * 2019-12-11 2021-06-17 トヨタ自動車株式会社 Cylinder head structure of internal combustion engine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009087923A (en) * 2007-09-13 2009-04-23 Ngk Spark Plug Co Ltd Spark plug and internal combustion engine mounted with the spark plug
JP2009133219A (en) * 2007-11-28 2009-06-18 Daihatsu Motor Co Ltd Cylinder head
US20140150746A1 (en) * 2012-12-05 2014-06-05 Ford Global Technologies, Llc Valve cover with integrated sparkplug tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009087923A (en) * 2007-09-13 2009-04-23 Ngk Spark Plug Co Ltd Spark plug and internal combustion engine mounted with the spark plug
JP2009133219A (en) * 2007-11-28 2009-06-18 Daihatsu Motor Co Ltd Cylinder head
US20140150746A1 (en) * 2012-12-05 2014-06-05 Ford Global Technologies, Llc Valve cover with integrated sparkplug tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021092203A (en) * 2019-12-11 2021-06-17 トヨタ自動車株式会社 Cylinder head structure of internal combustion engine
JP7302462B2 (en) 2019-12-11 2023-07-04 トヨタ自動車株式会社 Cylinder head structure of internal combustion engine

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