JPH0539747A - Tightening structure and method for internal combustion engine cylinder head - Google Patents
Tightening structure and method for internal combustion engine cylinder headInfo
- Publication number
- JPH0539747A JPH0539747A JP19421491A JP19421491A JPH0539747A JP H0539747 A JPH0539747 A JP H0539747A JP 19421491 A JP19421491 A JP 19421491A JP 19421491 A JP19421491 A JP 19421491A JP H0539747 A JPH0539747 A JP H0539747A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- cylinder head
- combustion engine
- internal combustion
- liners
- 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.)
- Pending
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
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/006—Camshaft or pushrod housings
- F02F2007/0063—Head bolts; Arrangements of cylinder head bolts
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、直列多気筒内燃機関の
シリンダブロック頂面にガスケットを介してシリンダヘ
ッドを重ね合わせ、シリンダブロックとシリンダヘッド
をボルトで結合する内燃機関のシリンダヘッド締付構造
および締付方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder head tightening structure for an internal combustion engine in which a cylinder head is superposed on the top surface of a cylinder block of an in-line multi-cylinder internal combustion engine via a gasket and the cylinder block and the cylinder head are connected by bolts. And the tightening method.
【０００２】[0002]
【従来の技術】混合気の爆発によって生じる燃焼ガスの
吹き抜けを防止すべく、内燃機関のシリンダブロックと
シリンダヘッドはガスケットを介して複数本のボルトで
強固に結合される。その際、ガスケットを有効に作用さ
せてシール効果を高めるために、シリンダブロックに嵌
合するシリンダライナーの上縁をシリンダブロックの頂
面からガスケットに向けて僅かに突出させ、これにより
シリンダのボア線圧（シリンダライナーの上縁に作用す
る荷重を該シリンダライナーの周長を割った値）を充分
に確保している。2. Description of the Related Art A cylinder block and a cylinder head of an internal combustion engine are firmly connected with a plurality of bolts through a gasket in order to prevent blowout of combustion gas caused by explosion of air-fuel mixture. At this time, in order to make the gasket work effectively and enhance the sealing effect, the upper edge of the cylinder liner fitted to the cylinder block is slightly projected from the top surface of the cylinder block toward the gasket, which causes the bore line of the cylinder. A sufficient pressure (a value obtained by dividing the load acting on the upper edge of the cylinder liner by the circumferential length of the cylinder liner) is secured.
【０００３】[0003]
【発明が解決しようとする課題】ところで、３個以上の
シリンダライナーを有する直列多気筒内燃機関ではシリ
ンダヘッドの形状がシリンダライナーの配列方向に沿っ
て長くなるため、シリンダヘッドをシリンダブロックに
複数本のボルトで結合する際にシリンダヘッドがアーチ
状に湾曲し、両端側のシリンダライナーのボア線圧が中
央側のシリンダライナーのボア線圧に比べて過大になる
問題がある。図６はその実験結果を示すグラフであっ
て、ボルトの締付軸力の小さい領域から大きい領域に亘
って直列４気筒内燃機関の両端側の２個のシリンダライ
ナー（＃１および＃４）のボア線圧が中央側の２個のシ
リンダライナー（＃２および＃３）のボア線圧を上回っ
ていることが理解される。By the way, in an in-line multi-cylinder internal combustion engine having three or more cylinder liners, the shape of the cylinder head becomes longer along the direction in which the cylinder liners are arranged. There is a problem that the cylinder head is curved in an arch shape when the bolts are connected with each other, and the bore line pressure of the cylinder liner on both end sides becomes excessively large as compared with the bore line pressure of the cylinder liner on the center side. FIG. 6 is a graph showing the results of the experiment, in which two cylinder liners (# 1 and # 4) on both ends of an in-line four-cylinder internal combustion engine are arranged from a region where the bolt tightening axial force is small to a region where the bolt tightening axial force is large. It is understood that the bore line pressure exceeds the bore line pressures of the two central cylinder liners (# 2 and # 3).
【０００４】上述のように各シリンダライナー毎にボア
線圧が不均一になるのを防止するには、最も不利な中央
のシリンダライナーのボア線圧が基準値に達するように
ボルトの締付軸力を全体的に増加させる必要が生じる
が、そのようにするとボルトのサイズが大きくなって重
量が増加するだけでなく、両端側のシリンダライナーの
ボア線圧が過剰になって該シリンダライナーの真円度が
低下する等の問題が発生する。As described above, in order to prevent the bore line pressure from becoming uneven among the cylinder liners, the bolt tightening shaft is adjusted so that the bore line pressure of the most disadvantageous central cylinder liner reaches the reference value. The overall force needs to be increased, which not only increases the size of the bolt and increases the weight, but also increases the bore line pressure of the cylinder liner on both ends and causes the cylinder liner to lose its true pressure. Problems such as a decrease in circularity occur.
【０００５】本発明は前述の事情に鑑みてなされたもの
で、直列多気筒内燃機関の各シリンダライナーのボア線
圧を均一化することを目的とする。The present invention has been made in view of the above circumstances, and it is an object of the present invention to equalize the bore linear pressure of each cylinder liner of an in-line multi-cylinder internal combustion engine.
【０００６】[0006]
【課題を解決するための手段】前記目的を達成するため
に、本発明は、少なくとも３個のシリンダライナーを嵌
合させた直列多気筒内燃機関のシリンダブロック頂面に
ガスケットを介してシリンダヘッドを重ね合わせ、シリ
ンダブロックとシリンダヘッドをボルトで結合する内燃
機関のシリンダヘッド締付構造において、中央側のシリ
ンダライナーの上縁を両端側のシリンダライナーの上縁
よりもガスケットに向けて大きく突出させたことを第１
の特徴とする。In order to achieve the above object, the present invention provides a cylinder head with a gasket on the top surface of a cylinder block of an in-line multi-cylinder internal combustion engine in which at least three cylinder liners are fitted. In the cylinder head tightening structure of an internal combustion engine in which cylinder blocks and cylinder heads are overlapped and connected with bolts, the upper edge of the cylinder liner on the center side is made to protrude more toward the gasket than the upper edges of the cylinder liner on both ends. The first thing
It is a feature of.
【０００７】また本発明は、少なくとも３個のシリンダ
を有する直列多気筒内燃機関のシリンダブロック頂面に
ガスケットを介してシリンダヘッドを重ね合わせ、シリ
ンダブロックとシリンダヘッドをボルトで結合する内燃
機関のシリンダヘッド締付方法において、シリンダヘッ
ドの両端側のボルトの締付軸力を、シリンダヘッドの中
央側のボルトの締付軸力よりも小さく設定することを第
２の特徴とする。Further, the present invention is a cylinder of an internal combustion engine in which a cylinder head is superposed on a top surface of a cylinder block of an in-line multi-cylinder internal combustion engine having at least three cylinders via a gasket, and the cylinder block and the cylinder head are connected by bolts. The second feature of the head tightening method is that the tightening axial force of the bolts on both ends of the cylinder head is set to be smaller than the tightening axial force of the bolts on the center side of the cylinder head.
【０００８】[0008]
【実施例】以下、図面に基づいて本発明の第１実施例を
説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.
【０００９】図１〜図３に示すように、ＤＯＨＣ型の４
気筒内燃機関Ｅはシリンダブロック１と該シリンダブロ
ック１の上部にガスケット２を介して重ね合わされて複
数本のボルト３で結合されるシリンダヘッド４を備え
る。シリンダブロック１の内部には４個のシリンダライ
ナー５ａ〜５ｄが嵌合保持され、そのシリンダライナー
５ａ〜５ｄに摺合するピストン６はコネクティングロッ
ド７を介してクランクシャフト８に連結される。As shown in FIGS. 1 to 3, the DOHC type 4
The cylinder internal combustion engine E includes a cylinder block 1 and a cylinder head 4 which is superposed on the cylinder block 1 via a gasket 2 and is joined by a plurality of bolts 3. Four cylinder liners 5a to 5d are fitted and held inside the cylinder block 1, and a piston 6 sliding on the cylinder liners 5a to 5d is connected to a crankshaft 8 via a connecting rod 7.
【００１０】ピストン６の上面に対向するようにシリン
ダヘッド４に形成された燃焼室９には、吸気ポート１０
に連なる吸気弁口１１と排気ポート１２に連なる排気弁
口１３が設けられる。吸気弁口１１を開閉する吸気弁１
４はシリンダヘッド４とリテーナ１５間に縮設した弁バ
ネ１６で閉弁方向に付勢される。また排気弁口１３を開
閉する排気弁１７はシリンダヘッド４とリテーナ１８間
に縮設した弁バネ１９で閉弁方向に付勢される。An intake port 10 is provided in a combustion chamber 9 formed in the cylinder head 4 so as to face the upper surface of the piston 6.
An intake valve opening 11 continuous with the exhaust port 12 and an exhaust valve opening 13 continuous with the exhaust port 12 are provided. Intake valve 1 that opens and closes the intake valve opening 11
A valve spring 16 is compressed between the cylinder head 4 and the retainer 15 and is urged in the valve closing direction. An exhaust valve 17 that opens and closes the exhaust valve port 13 is urged in a valve closing direction by a valve spring 19 that is compressed between the cylinder head 4 and the retainer 18.
【００１１】吸気側ロッカアームシャフト２０と排気側
ロッカアームシャフト２１には、それぞれ吸気側ロッカ
アーム２２と排気側ロッカアーム２３が揺動自在に支承
される。両ロッカアーム２２，２３にはクランクシャフ
ト８の１／２の回転数で回転する吸気側カムシャフト２
４に設けた吸気カム２５と排気側カムシャフト２６に設
けた排気カム２７がそれぞれ当接し、また前記両ロッカ
アーム２２，２３は吸気弁１４の軸部上端と排気弁１７
の軸部上端にそれぞれ当接する。上記動弁機構はシリン
ダヘッド４の上面に結合されるヘッドカバー２８によっ
て覆われ、そのヘッドカバー２８の中央を貫通するプラ
グ着脱穴の底部には燃焼室９内に突出するプラグ２９が
装着される。An intake side rocker arm 22 and an exhaust side rocker arm 23 are swingably supported on the intake side rocker arm shaft 20 and the exhaust side rocker arm shaft 21, respectively. Both rocker arms 22 and 23 have intake camshaft 2 that rotates at half the speed of crankshaft 8.
4 and the exhaust cam 27 provided on the exhaust side cam shaft 26 are in contact with each other, and the rocker arms 22 and 23 are connected to the upper end of the shaft of the intake valve 14 and the exhaust valve 17.
Abutting on the upper end of the shaft part of each. The valve operating mechanism is covered by a head cover 28 which is connected to the upper surface of the cylinder head 4, and a plug 29 protruding into the combustion chamber 9 is attached to the bottom of a plug attaching / detaching hole that penetrates the center of the head cover 28.
【００１２】シリンダライナー５ａ〜５ｄの下部外周に
は軸方向に外径が一定な結合部５1 と、その結合部５1
の上端に接続する段部５2 が設けられるとともに、シリ
ンダブロック１には軸方向に外径が一定な結合部１1 と
その結合部１1 の上端に接続する段部１2 が設けられ
る。そしてシリンダライナー５ａ〜５ｄは、その結合部
５1 をシリンダブロック１の結合部１1 に嵌合させて両
段部５2 ，１2 を相互に当接させた状態でシリンダブロ
ック１の内部に結合される。シリンダライナー５ａ〜５
ｄの外面５3 と、その外側に位置するシリンダブロック
１の内面１3 との間にはウオータジャケット３０が形成
される。ウオータジャケット３０の上端はガスケット２
を貫通してシリンダヘッド４の内部に延びるとともに、
その下端はシリンダライナー５ａ〜５ｄの結合部５1 に
設けた２個のシール部材３１によりシールされる。On the outer periphery of the lower portion of the cylinder liners 5a to 5d, there is a joint portion 5 1 having a constant outer diameter in the axial direction, and the joint portion 5 1
With stepped portions 5 2 connected to the upper end of the are provided, stepped portions 1 2 having an outer diameter in the axial direction to connect constant coupling portion 1 1 and the upper end of the coupling part 1 1 is provided in the cylinder block 1. The cylinder liner 5a~5d are inside the cylinder block 1 with its coupling portion 5 1 a is brought into contact with coupling portion 1 1 in fitted allowed by both stepped portion 5 2, 1 2 of the cylinder block 1 to each other Be combined. Cylinder liner 5a-5
A water jacket 30 is formed between the outer surface 5 3 of d and the inner surface 1 3 of the cylinder block 1 located outside thereof. The upper end of the water jacket 30 is the gasket 2
While extending through the inside of the cylinder head 4,
The lower end of the cylinder liners 5a to 5d is sealed by two sealing members 31 provided at the connecting portion 5 1 .
【００１３】図４および図５から明らかなように、シリ
ンダライナー５ａ〜５ｄの上縁のシリンダブロック１頂
面からの突出量は、両端側の２個のシリンダライナー５
ａ，５ｄと中央側の２個のシリンダライナー５ｂ，５ｃ
とで異なっている。すなわち、両端側の２個のシリンダ
ライナー５ａ，５ｄの突出量Ｌ1 は小さく、中央側の２
個のシリンダライナー５ｂ，５ｃの突出量Ｌ2 は前記Ｌ
1 よりも大きくなるように設定されている。尚、図面で
は誇張して描かれているが、前記突出量Ｌ1 ，Ｌ2 は実
際には極めて小さいものである。As is apparent from FIGS. 4 and 5, the amount of protrusion of the upper edges of the cylinder liners 5a to 5d from the top surface of the cylinder block 1 is two cylinder liners 5 on both ends.
a, 5d and two cylinder liners 5b, 5c on the center side
And are different. That is, the protrusion amount L 1 of the two cylinder liners 5a and 5d on both ends is small, and
The protrusion amount L 2 of each cylinder liner 5b, 5c is L
It is set to be larger than 1 . Although exaggerated in the drawing, the protrusion amounts L 1 and L 2 are actually extremely small.
【００１４】図７に示すように、ボルトの締付軸力が一
定である場合に、シリンダライナーの上縁のシリンダブ
ロック頂面からの突出量が大きい程ボア線圧が大きくな
る。従って、上述のように両端側の２個のシリンダライ
ナー５ａ，５ｄの突出量Ｌ1 を小さく、中央側の２個の
シリンダライナー５ｂ，５ｃの突出量Ｌ2 を大きく設定
した状態で全てのボルト３を同一の締付軸力で固定する
と、中央側の２個のシリンダライナー５ｂ，５ｃにおけ
るシリンダヘッド４のアーチ状湾曲に起因するボア線圧
の低下が、そのシリンダライナー５ｂ，５ｃの大きい突
出量Ｌ2 に起因するボア線圧の増加によって補われ、結
果として全てのシリンダライナー５ａ〜５ｄのボア線圧
を略一定とすることができる。As shown in FIG. 7, when the tightening axial force of the bolt is constant, the bore linear pressure increases as the amount of protrusion of the upper edge of the cylinder liner from the top surface of the cylinder block increases. Thus, two cylinder liners 5a at both ends as described above, 5d small protrusion amount L 1 of the center side of the two cylinders liners 5b, all of the bolts while larger and 5c protruding amount L 2 of When 3 is fixed with the same tightening axial force, the decrease in the bore linear pressure due to the arch-shaped curve of the cylinder head 4 in the two cylinder liners 5b and 5c on the center side causes a large protrusion of the cylinder liners 5b and 5c. supplemented by increasing the bore line pressure due to the amount L 2, it can be made substantially constant bore line pressure of all cylinders liners 5a~5d consequently.
【００１５】而して、直列多気筒内燃機関Ｅのシリンダ
ヘッド４のアーチ状湾曲に起因するシリンダライナー５
ａ〜５ｄのボア線圧の不均一が解消するため、サイズが
小さい軽量なボルト３で必要最小限のボア線圧を確保す
ることが可能となり、しかも過剰なボア線圧でシリンダ
ライナー５ａ〜５ｄの真円度が低下してピストンリング
とシリンダライナー５ａ〜５ｄ間に隙間が発生すること
が防止され、ピストンリングの張力を低く抑えて摺動抵
抗を減少させてもオイルの消費量やブローバイガスの量
が増加することがない。Thus, the cylinder liner 5 resulting from the arch-shaped curve of the cylinder head 4 of the in-line multi-cylinder internal combustion engine E.
Since the unevenness of the bore line pressures of a to 5d is eliminated, it becomes possible to secure the minimum required bore line pressure with the small and lightweight bolts 3, and the cylinder liners 5a to 5d with the excessive bore line pressure. Of the piston ring and the cylinder liners 5a to 5d are prevented from decreasing in roundness, and even if the sliding resistance is reduced by suppressing the tension of the piston ring to a low level, the oil consumption and blow-by gas Does not increase in quantity.
【００１６】図８は本発明の第２実施例を示すもので、
この実施例の４個のシリンダライナー５ａ〜５ｄのシリ
ンダブロック１頂面からの突出量Ｌは全て同一に設定さ
れる。そして１０本のボルト３ａ，３ｂのうち、中央側
に位置する６本のボルト３ｂの締付軸力は、両端側の４
本のボルト３ａの締付軸力よりも大きく設定される。こ
れによりシリンダヘッド４がアーチ状の湾曲することが
防止され、結果として全てのシリンダライナー５ａ〜５
ｄのボア線圧を略一定とすることができる。FIG. 8 shows a second embodiment of the present invention.
The protrusion amounts L of the four cylinder liners 5a to 5d of this embodiment from the top surface of the cylinder block 1 are all set to be the same. Of the 10 bolts 3a and 3b, the tightening axial force of the 6 bolts 3b located on the center side is 4
It is set to be larger than the tightening axial force of the bolt 3a of the book. As a result, the cylinder head 4 is prevented from arching, and as a result, all the cylinder liners 5a-5
The bore linear pressure of d can be made substantially constant.
【００１７】以上、本発明の実施例を詳述したが、本発
明は前記実施例に限定されるものでなく、特許請求の範
囲に記載された本発明を逸脱することなく種々の小設計
変更を行うことが可能である。Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various small design changes can be made without departing from the present invention described in the claims. It is possible to
【００１８】例えば、実施例では直列４気筒内燃機関を
例示したが、本発明は３気筒あるいは５気筒以上の内燃
機関に対しても適用可能である。また第１実施例ではシ
リンダライナーの突出量を２段階に設定し、第２実施例
ではボルトの締付軸力を２段階に設定しているが、それ
らを３段階以上に設定することも可能である。更に、第
２実施例におけるシリンダライナーは必ずしも必要でな
く、シリンダブロック１に直接シリンダを形成しても良
い。For example, although the in-line four-cylinder internal combustion engine has been illustrated in the embodiment, the present invention is also applicable to an internal combustion engine having three cylinders or five cylinders or more. Further, in the first embodiment, the projection amount of the cylinder liner is set in two stages, and in the second embodiment, the bolt tightening axial force is set in two stages, but it is also possible to set them in three or more stages. Is. Further, the cylinder liner in the second embodiment is not always necessary, and the cylinder may be directly formed in the cylinder block 1.
【００１９】[0019]
【発明の効果】以上のように本発明の第１の特徴によれ
ば、直列多気筒内燃機関の中央側のシリンダライナーの
上縁を両端側のシリンダライナーの上縁よりもガスケッ
トに向けて大きく突出させたので、シリンダヘッドをボ
ルトでシリンダブロックの頂面に結合する際に前記シリ
ンダヘッドのアーチ状湾曲を補償して各シリンダライナ
ーのボア線圧を略一定に保持することができる。その結
果、サイズの小さいボルトで必要なボア線圧を確保する
ことが可能となり、しかも過剰なボア線圧が発生しない
のでシリンダライナーの真円度を維持することができ
る。As described above, according to the first feature of the present invention, the upper edge of the cylinder liner at the center of the in-line multi-cylinder internal combustion engine is made larger toward the gasket than the upper edges of the cylinder liners at both ends. Since the protrusion is provided, when the cylinder head is coupled to the top surface of the cylinder block with a bolt, the arch-shaped curvature of the cylinder head can be compensated and the bore linear pressure of each cylinder liner can be maintained substantially constant. As a result, it becomes possible to secure the required bore linear pressure with a small-sized bolt, and since excessive bore linear pressure does not occur, it is possible to maintain the roundness of the cylinder liner.
【００２０】また本発明の第２の特徴によれば、直列多
気筒内燃機関のシリンダヘッドの両端側のボルトの締付
軸力を、シリンダヘッドの中央側のボルトの締付軸力よ
りも小さく設定したので、シリンダヘッドをボルトでシ
リンダブロックの頂面に結合する際に前記シリンダヘッ
ドのアーチ状湾曲を防止して各シリンダのボア線圧を略
一定に保持することができる。その結果、サイズの小さ
いボルトで必要なボア線圧を確保することが可能とな
り、しかも過剰なボア線圧が発生しないのでシリンダの
真円度を維持することができる。According to the second aspect of the present invention, the tightening axial force of the bolts on both ends of the cylinder head of the in-line multi-cylinder internal combustion engine is smaller than the tightening axial force of the bolts on the center side of the cylinder head. Since the setting is made, when the cylinder head is connected to the top surface of the cylinder block by the bolt, the arch-shaped curve of the cylinder head can be prevented and the bore linear pressure of each cylinder can be kept substantially constant. As a result, it becomes possible to secure the required bore linear pressure with a small-sized bolt, and since the excessive bore linear pressure does not occur, the roundness of the cylinder can be maintained.
【図１】本発明の第１実施例による内燃機関の全体側面
図FIG. 1 is an overall side view of an internal combustion engine according to a first embodiment of the present invention.
【図２】図１の２−２線断面図FIG. 2 is a sectional view taken along line 2-2 of FIG.
【図３】図１の３−３線断面図3 is a sectional view taken along line 3-3 of FIG.
【図４】図３の４−４線断面図4 is a sectional view taken along line 4-4 of FIG.
【図５】図３の５−５線断面図5 is a sectional view taken along line 5-5 of FIG.
【図６】シリンダライナーの位置とボア線圧の関係を示
すグラフFIG. 6 is a graph showing the relationship between the position of the cylinder liner and the bore linear pressure.
【図７】シリンダライナーの上縁の突出量とボア線圧の
関係を示すグラフFIG. 7 is a graph showing the relationship between the protrusion amount of the upper edge of the cylinder liner and the bore linear pressure.
【図８】本発明の第２実施例を示す前記図５に対応する
断面図FIG. 8 is a sectional view corresponding to FIG. 5 and showing a second embodiment of the present invention.
１・・・・・・シリンダブロック ２・・・・・・ガスケット ３・・・・・・ボルト ３ａ，３ｂ・・ボルト ４・・・・・・シリンダヘッド ５ａ〜５ｄ・・シリンダライナー Cylinder block 2 Gasket 3 Bolts 3a, 3b Bolt 4 Cylinder head 5a to 5d Cylinder liner
Claims (2)
ａ〜５ｄ）を嵌合させた直列多気筒内燃機関のシリンダ
ブロック（１）頂面にガスケット（２）を介してシリン
ダヘッド（４）を重ね合わせ、シリンダブロック（１）
とシリンダヘッド（４）をボルト（３）で結合する内燃
機関のシリンダヘッド締付構造において、 中央側のシリンダライナー（５ｂ，５ｃ）の上縁を両端
側のシリンダライナー（５ａ，５ｄ）の上縁よりもガス
ケット（２）に向けて大きく突出させたことを特徴とす
る、内燃機関のシリンダヘッド締付構造。1. At least three cylinder liners (5)
a to 5d), the cylinder block (1) is superposed on the top surface of the cylinder block (1) of the in-line multi-cylinder internal combustion engine via the gasket (2), and the cylinder block (1)
In a cylinder head tightening structure for an internal combustion engine in which the cylinder head (4) and the cylinder head (4) are connected by a bolt (3), the upper edge of the cylinder liner (5b, 5c) on the center side is positioned above the cylinder liner (5a, 5d) on both ends. Cylinder head tightening structure for an internal combustion engine, characterized in that it is made to project more toward the gasket (2) than at the edges.
多気筒内燃機関のシリンダブロック（１）頂面にガスケ
ット（２）を介してシリンダヘッド（４）を重ね合わ
せ、シリンダブロック（１）とシリンダヘッド（４）を
ボルト（３ａ，３ｂ）で結合する内燃機関のシリンダヘ
ッド締付方法において、 シリンダヘッド（４）の両端側のボルト（３ａ）の締付
軸力を、シリンダヘッド（４）の中央側のボルト（３
ｂ）の締付軸力よりも小さく設定することを特徴とす
る、内燃機関のシリンダヘッド締付方法。2. A cylinder head (4) is superposed on a top surface of a cylinder block (1) of an in-line multi-cylinder internal combustion engine having at least three cylinders with a gasket (2) interposed between the cylinder block (1) and the cylinder head. In a cylinder head tightening method for an internal combustion engine, in which (4) is connected with bolts (3a, 3b), the tightening axial force of the bolts (3a) on both ends of the cylinder head (4) is adjusted to the center of the cylinder head (4). Side bolt (3
A method for tightening a cylinder head of an internal combustion engine, characterized in that it is set to be smaller than the tightening axial force of b).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19421491A JPH0539747A (en) | 1991-08-02 | 1991-08-02 | Tightening structure and method for internal combustion engine cylinder head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19421491A JPH0539747A (en) | 1991-08-02 | 1991-08-02 | Tightening structure and method for internal combustion engine cylinder head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0539747A true JPH0539747A (en) | 1993-02-19 |
Family
ID=16320854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19421491A Pending JPH0539747A (en) | 1991-08-02 | 1991-08-02 | Tightening structure and method for internal combustion engine cylinder head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0539747A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0926331A3 (en) * | 1997-12-26 | 2000-02-23 | Isuzu Motors Limited | Cylinder block structure |
| DE102005048537A1 (en) * | 2005-10-11 | 2007-04-19 | Daimlerchrysler Ag | Internal combustion engine, has cylinder with cylinder sleeve that is supported at side on circular balcony in cylinder housing, where sleeve contacts contact surface of balcony in cylinder housing only in sections in non-deformed condition |
| CN103998756A (en) * | 2011-12-16 | 2014-08-20 | 卡特彼勒发动机有限及两合公司 | Cylinder liner and cylinder head for internal combustion engine |
-
1991
- 1991-08-02 JP JP19421491A patent/JPH0539747A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0926331A3 (en) * | 1997-12-26 | 2000-02-23 | Isuzu Motors Limited | Cylinder block structure |
| US6082320A (en) * | 1997-12-26 | 2000-07-04 | Isuzu Motors Limited | Cylinder block structure |
| DE102005048537A1 (en) * | 2005-10-11 | 2007-04-19 | Daimlerchrysler Ag | Internal combustion engine, has cylinder with cylinder sleeve that is supported at side on circular balcony in cylinder housing, where sleeve contacts contact surface of balcony in cylinder housing only in sections in non-deformed condition |
| CN103998756A (en) * | 2011-12-16 | 2014-08-20 | 卡特彼勒发动机有限及两合公司 | Cylinder liner and cylinder head for internal combustion engine |
| CN103998756B (en) * | 2011-12-16 | 2017-03-08 | 卡特彼勒发动机有限及两合公司 | Cylinder liner for explosive motor and cylinder head |
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