JPH05149194A - Cylinder head of internal combustion engine - Google Patents
Cylinder head of internal combustion engineInfo
- Publication number
- JPH05149194A JPH05149194A JP33439991A JP33439991A JPH05149194A JP H05149194 A JPH05149194 A JP H05149194A JP 33439991 A JP33439991 A JP 33439991A JP 33439991 A JP33439991 A JP 33439991A JP H05149194 A JPH05149194 A JP H05149194A
- Authority
- JP
- Japan
- Prior art keywords
- combustion chamber
- frm
- head
- cylinder head
- head body
- 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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F2001/249—Cylinder heads with flame plate, e.g. insert in the cylinder head used as a thermal insulation between cylinder head and combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2253/00—Other material characteristics; Treatment of material
- F05C2253/16—Fibres
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、内燃機関のシリンダヘ
ッドに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder head of an internal combustion engine.
【０００２】[0002]
【従来の技術】一般に、図２に示すような２サイクルエ
ンジンは、リードバルブ５１にて開閉される吸気ポート
５２を有するクランクケース５３、該クランクケース５
３の上部に設けられ掃気ポート５４および排気ポート５
５を有するシリンダブロック５６、該シリンダブロック
５６の上部に取付けられるシリンダヘッド５７等を備え
ており、このシリンダヘッド５７はアルミ鋳物で一体的
に形成され、頂部中央に点火プラグ（図示せず）を螺入
するプラグ取付孔５８が設けられている。なお、図にお
いて５９はシリンダブロック５６内を上下方向に摺動す
るピストン、６０はピストン５９とクランクシャフト６
１とを連結して往復運動を回転運動に変えるコンロッド
である。2. Description of the Related Art Generally, a two-cycle engine as shown in FIG. 2 has a crankcase 53 having an intake port 52 opened and closed by a reed valve 51, and the crankcase 5.
Scavenging port 54 and exhaust port 5 provided on the upper part of 3
5 is provided with a cylinder block 56, a cylinder head 57 attached to the upper portion of the cylinder block 56, and the like. The cylinder head 57 is integrally formed of aluminum casting, and an ignition plug (not shown) is provided at the center of the top. A plug mounting hole 58 for screwing is provided. In the figure, 59 is a piston that slides vertically in the cylinder block 56, and 60 is the piston 59 and the crankshaft 6.
It is a connecting rod that connects 1 and converts reciprocating motion into rotary motion.
【０００３】このような２サイクルエンジンにおいて、
エンジン性能を向上させるためには圧縮比を上げるのが
最も確実で効果的な方法であるが、あまり圧縮比を上げ
ると、これに伴ってシリンダヘッド５７の燃焼室６２の
スキッシュエリア部６３に異常燃焼による虫食い現象
（以下、デトネーションと称する）が発生することにな
る。したがって、圧縮比を上げるにも限界がある。一
方、上記したデトネーションを防止するため、燃焼室６
２を形成するシリンダヘッド５７の内壁面にアルマイト
メッキを施したりする方法もあるが、効果は少ない。In such a two-cycle engine,
The most reliable and effective method is to increase the compression ratio in order to improve the engine performance. However, if the compression ratio is increased too much, the squish area 63 of the combustion chamber 62 of the cylinder head 57 will be abnormal. An insect-eating phenomenon (hereinafter referred to as detonation) will occur due to combustion. Therefore, there is a limit to increase the compression ratio. On the other hand, in order to prevent the above detonation, the combustion chamber 6
There is also a method of performing alumite plating on the inner wall surface of the cylinder head 57 which forms No. 2, but the effect is small.
【０００４】[0004]
【発明が解決しようとする課題】そこで、高い強度を有
する繊維強化金属材（以下、ＦＲＭ材と称する）をシリ
ンダヘッド５７に使用してデトネーションを防ぐことも
考えられるが、当該ＦＲＭ材をシリンダヘッド５７に採
用するには次のような問題点がある。すなわち、ＦＲＭ
材は加工性が悪く、複雑な形状に形成することはできな
い。そのため、ピストン５９は鋳造品ではなく鍛造ピス
トンを用いて頭部にＦＲＭ材を溶着鍛造する必要があ
る。また、ＦＲＭ材はじん性が悪く脆弱で欠落しやすい
ので、シリンダヘッド５７に使用するとプラグ取付孔５
８にネジ加工することは難しい。Therefore, it is conceivable to use a fiber reinforced metal material having high strength (hereinafter referred to as FRM material) for the cylinder head 57 to prevent detonation. However, the FRM material is used for the cylinder head. There are the following problems to be adopted in 57. That is, FRM
The material has poor workability and cannot be formed into a complicated shape. Therefore, the piston 59 needs to be welded and forged with the FRM material on the head by using a forged piston instead of a cast product. Further, since the FRM material has poor toughness and is fragile and is likely to be dropped, when used for the cylinder head 57, the plug mounting hole 5
It is difficult to screw to 8.
【０００５】本発明はこのような実状に鑑みてなされた
ものであって、その目的は、ＦＲＭ材を利用してもプラ
グ取付孔のネジ加工に支障がなく、かつ点火プラグの冷
却性が良くなり、エンジン性能の向上を図ることが可能
な内燃機関のシリンダヘッドを提供することにある。The present invention has been made in view of the above circumstances, and an object thereof is to use a FRM material without hindering the screw processing of the plug mounting hole and to improve the cooling performance of the ignition plug. Another object of the present invention is to provide a cylinder head of an internal combustion engine capable of improving engine performance.
【０００６】[0006]
【課題を解決するための手段】上記従来技術の有する課
題を解決するために、本発明においては、燃焼室部を構
成するヘッド本体を繊維強化金属溶着鍛造品にて形成す
るとともに、前記ヘッド本体の内周壁に、該ヘッド本体
の中央部に設けられるプラグ取付孔の部分を除いて繊維
強化金属溶着材を燃焼室中央部付近よりも端部側が厚く
なるように溶着して燃焼室の壁面を前記ヘッド本体とは
別体に形成している。In order to solve the above-mentioned problems of the prior art, in the present invention, the head body constituting the combustion chamber portion is formed of a fiber reinforced metal welding forged product, and the head body is formed. On the inner peripheral wall of the head main body, except for the plug mounting hole provided in the central portion of the head main body, a fiber reinforced metal welding material is welded so that the end portion side is thicker than the vicinity of the central portion of the combustion chamber to form a wall surface of the combustion chamber. It is formed separately from the head body.
【０００７】[0007]
【作 用】本発明に係る内燃機関のシリンダヘッドで
は、ＦＲＭ溶着鍛造品のヘッド本体に設けられる燃焼室
の壁面をなす端部にＦＲＭ溶着材を中央部付近よりも厚
くなるように溶着しているため、ＦＲＭ材の特質によっ
て燃焼室のスキッシュエリア部に発生するデトネーショ
ンを確実に防げる。しかも、ヘッド本体の中央部に設け
られるプラグ取付孔の部分にはＦＲＭ溶着材が溶着され
ていないため、当該プラグ取付孔のネジ加工時にＦＲＭ
材が欠落するということは起こらない。[Operation] In the cylinder head of the internal combustion engine according to the present invention, the FRM welding material is welded to the end portion forming the wall surface of the combustion chamber provided in the head body of the FRM welding forged product so as to be thicker than the central portion. Therefore, due to the characteristics of the FRM material, detonation that occurs in the squish area of the combustion chamber can be reliably prevented. Moreover, since the FRM welding material is not welded to the plug mounting hole provided in the central portion of the head body, the FRM welding process is performed on the plug mounting hole.
Lack of wood does not occur.
【０００８】[0008]
【実施例】以下、本発明を図示の実施例に基づいて詳細
に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiments.
【０００９】図１は本発明の一実施例を示すもので、図
において１は２サイクルエンジンのシリンダヘッドであ
り、このシリンダヘッド１はシリンダを形成するシリン
ダブロック（図示せず）の上部に組付ボルトなどで取付
けられるようになっている。なお、シリンダブロックの
内部にはピストン２が上下方向に摺動自在に配設されて
いる。FIG. 1 shows an embodiment of the present invention. In the figure, reference numeral 1 is a cylinder head of a two-cycle engine, and this cylinder head 1 is assembled on an upper portion of a cylinder block (not shown) forming a cylinder. It can be attached with attached bolts. A piston 2 is provided inside the cylinder block so as to be vertically slidable.
【００１０】上記シリンダヘッド１は、ＦＲＭ溶着鍛造
品を用い内部に断面略半円形状の空洞部が形成されるヘ
ッド本体３と、該ヘッド本体３の上部にガスケット４を
介して取付けられるヘッドカバー５とを有しており、こ
れらヘッド本体３とヘッドカバー５との間には冷却水を
溜める水ジャケット６が形成されている。The cylinder head 1 is a head body 3 in which a hollow portion having a substantially semicircular cross section is formed using a FRM fusion forged product, and a head cover 5 mounted on the top of the head body 3 via a gasket 4. A water jacket 6 for storing cooling water is formed between the head body 3 and the head cover 5.
【００１１】ヘッド本体３は燃焼室部を構成するもの
で、内部には混合気が燃焼する半球形型燃焼室７が形成
されている。この燃焼室７の頂点に位置するヘッド本体
３の中央部には、雌ネジ加工されるプラグ取付孔８が穿
設されており、該プラグ取付孔８内に雄ネジ部を螺入す
ることにより点火プラグ（図示せず）が取付けられるよ
うになっている。また、燃焼室７の周端部には、当該燃
焼室７内にガス流動を生成するためのスキッシュエリア
部９が設けられている。このスキッシュエリア部９は、
ヘッド本体３の底面とピストン２の頂面との間に形成さ
れる狭い間隙であり、シリンダヘッド１とピストン２と
の相対連動を利用してスキッシュエリア部９から燃焼室
７の空間へ混合気を押し出したり、あるいは引き戻すス
キッシュ流を作り出し、燃焼速度を速くせしめている。The head body 3 constitutes a combustion chamber portion, and a hemispherical combustion chamber 7 in which an air-fuel mixture burns is formed inside. In the center of the head body 3 located at the apex of the combustion chamber 7, a plug mounting hole 8 for female threading is formed, and by inserting a male screw section into the plug mounting hole 8. A spark plug (not shown) is attached. Further, a squish area portion 9 for generating a gas flow in the combustion chamber 7 is provided at the peripheral end portion of the combustion chamber 7. This squish area part 9
It is a narrow gap formed between the bottom surface of the head body 3 and the top surface of the piston 2, and the relative interlock between the cylinder head 1 and the piston 2 is used to move the air-fuel mixture from the squish area 9 to the space of the combustion chamber 7. It creates a squish flow that pushes out or pulls back, increasing the burning speed.
【００１２】しかして、上記燃焼室７の壁面は、ヘッド
本体３の内周壁に高い強度を有するＦＲＭ溶着材１０を
溶着することによって当該ヘッド本体３とは別体に形成
されている。ＦＲＭ溶着材１０の溶着層は、燃焼室７の
半円球形を形成する内径Ｒ1 よりも外径Ｒ2 の方を大き
くしかつ内径Ｒ1 の中心Ｏよりも下方へＸｍｍずらすこ
とによって、デトネーション発生部となる燃焼室７の端
部のスキッシュエリア部９が中央部付近よりも厚くなる
ように形成されている。しかも、ＦＲＭ溶着材１０はヘ
ッド本体３の中央部に設けられるプラグ取付孔８の部分
を除いて溶着されることになるため、じん性および熱伝
導率が悪くて脆弱な性質をも併せて有するＦＲＭ溶着材
１０の溶着層が上記したプラグ取付孔８にかからないよ
うになっている。The wall surface of the combustion chamber 7 is formed separately from the head body 3 by welding the FRM welding material 10 having high strength to the inner peripheral wall of the head body 3. The welding layer of the FRM welding material 10 has a larger outer diameter R 2 than the inner diameter R 1 forming the hemispherical shape of the combustion chamber 7 and is displaced by X mm below the center O of the inner diameter R 1 by detonation. The squish area portion 9 at the end portion of the combustion chamber 7 that is the generation portion is formed to be thicker than the central portion. In addition, since the FRM welding material 10 is welded except for the plug mounting hole 8 provided in the central portion of the head body 3, it also has poor toughness and thermal conductivity and is fragile. The welding layer of the FRM welding material 10 does not cover the plug mounting hole 8 described above.
【００１３】本実施例のシリンダヘッド１においては、
燃焼室７の周端部にＦＲＭ溶着材１０を中央部付近より
も厚く溶着しているため、スキッシュエリア部９にデト
ネーションが発生しなくなる。また、ＦＲＭ溶着材１０
の溶着層はプラグ取付孔８の部分に形成されていないた
め、当該プラグ取付孔８のネジ加工に際してＦＲＭ溶着
材１０の欠落を考慮することなく加工作業が行える上、
プラグ座廻りの熱伝導性が損なわれるということはな
い。In the cylinder head 1 of this embodiment,
Since the FRM welding material 10 is welded to the peripheral end portion of the combustion chamber 7 thicker than in the vicinity of the central portion, detonation does not occur in the squish area portion 9. Also, the FRM welding material 10
Since the welding layer of No. is not formed in the portion of the plug mounting hole 8, the screwing of the plug mounting hole 8 can be performed without considering the lack of the FRM welding material 10 and the processing work can be performed.
The thermal conductivity around the plug seat is not impaired.
【００１４】以上、本発明の一実施例につき述べたが、
本発明は既述の実施例に限定されるものではなく、本発
明の技術的思想に基づいて各種の変形および変更が可能
である。The embodiment of the present invention has been described above.
The present invention is not limited to the embodiments described above, and various modifications and changes can be made based on the technical idea of the present invention.
【００１５】[0015]
【発明の効果】上述の如く、本発明に係る内燃機関のシ
リンダヘッドは、燃焼室部を構成するヘッド本体をＦＲ
Ｍ溶着鍛造品にて形成するとともに、前記ヘッド本体の
内周壁に、該ヘッド本体の中央部に設けられるプラグ取
付孔の部分を除いてＦＲＭ溶着材を燃焼室中央部付近よ
りも端部側が厚くなるように溶着して燃焼室の壁面を前
記ヘッド本体とは別体に形成したので、高い強度を有す
るＦＲＭ材を有効に利用することができ、燃焼室の端部
に設けられるスキッシュエリア部に特に発生するデトネ
ーションを確実に防止できる。したがって、本発明のシ
リンダヘッドを取付けた２サイクルエンジンでは、支障
なく圧縮比を上げることが可能になるため、従来に比べ
てエンジン性能の向上を図ることができる。As described above, in the cylinder head of the internal combustion engine according to the present invention, the head body forming the combustion chamber portion is FR.
The FRM welding material is formed on the inner peripheral wall of the head main body at the end side thicker than the vicinity of the central portion of the combustion chamber, except for the plug attachment hole provided in the central portion of the head main body. Since the wall surface of the combustion chamber is formed separately from the head body by welding so that the FRM material having high strength can be effectively used, and the squish area portion provided at the end portion of the combustion chamber can be effectively used. In particular, detonation that occurs can be reliably prevented. Therefore, in the two-cycle engine equipped with the cylinder head of the present invention, it is possible to increase the compression ratio without any trouble, so that the engine performance can be improved as compared with the conventional engine.
【００１６】また、本発明のシリンダヘッドは、ヘッド
本体の中央部に設けられるプラグ取付孔の部分にＦＲＭ
溶着材が溶着されていないので、当該プラグ取付孔のネ
ジ加工時にＦＲＭ材が欠落するということは起こらず、
加工作業を容易に行うことができるとともに、点火プラ
グの冷却性が良くなる。Further, in the cylinder head of the present invention, the FRM is provided in the plug mounting hole provided at the center of the head body.
Since the welding material is not welded, it does not happen that the FRM material is missing when the plug mounting hole is screwed.
Processing work can be performed easily, and the cooling performance of the spark plug is improved.
【図１】本発明の一実施例に係る内燃機関のシリンダヘ
ッドを示す断面図である。FIG. 1 is a sectional view showing a cylinder head of an internal combustion engine according to an embodiment of the present invention.
【図２】従来のシリンダヘッドを取付けた２サイクルエ
ンジンを示す断面図である。FIG. 2 is a sectional view showing a two-cycle engine to which a conventional cylinder head is attached.
１ シリンダヘッド ３ ヘッド本体 ７ 燃焼室 ８ プラグ取付孔 ９ スキッシュエリア部 １０ ＦＲＭ溶着材（繊維強化金属溶着材） 1 Cylinder Head 3 Head Body 7 Combustion Chamber 8 Plug Mounting Hole 9 Squish Area 10 FRM Welding Material (Fiber Reinforced Metal Welding Material)
Claims (1)
化金属溶着鍛造品にて形成するとともに、前記ヘッド本
体の内周壁に、該ヘッド本体の中央部に設けられるプラ
グ取付孔の部分を除いて繊維強化金属溶着材を燃焼室中
央部付近よりも端部側が厚くなるように溶着して燃焼室
の壁面を前記ヘッド本体とは別体に形成したことを特徴
とする内燃機関のシリンダヘッド。1. A head main body which constitutes a combustion chamber is formed of a fiber-reinforced metal welding forged product, and a plug mounting hole provided in an inner peripheral wall of the head main body at a central portion of the head main body is excluded. A cylinder head for an internal combustion engine, wherein a fiber reinforced metal welding material is welded so that the end portion side is thicker than the vicinity of the central portion of the combustion chamber, and the wall surface of the combustion chamber is formed separately from the head body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33439991A JPH05149194A (en) | 1991-11-22 | 1991-11-22 | Cylinder head of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33439991A JPH05149194A (en) | 1991-11-22 | 1991-11-22 | Cylinder head of internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05149194A true JPH05149194A (en) | 1993-06-15 |
Family
ID=18276936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33439991A Pending JPH05149194A (en) | 1991-11-22 | 1991-11-22 | Cylinder head of internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05149194A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016093997A1 (en) * | 2014-12-12 | 2016-06-16 | Briggs & Stratton Corporation | Welded engine block for small internal combustion engines |
| US9581106B2 (en) | 2013-07-09 | 2017-02-28 | Briggs & Stratton Corporation | Welded engine block for small internal combustion engines |
| US9863363B2 (en) | 2013-07-09 | 2018-01-09 | Briggs & Stratton Corporation | Welded engine block for small internal combustion engines |
| US10202938B2 (en) | 2013-07-09 | 2019-02-12 | Briggs & Stratton Corporation | Welded engine block for small internal combustion engines |
| US11761402B2 (en) | 2020-03-02 | 2023-09-19 | Briggs & Stratton, Llc | Internal combustion engine with reduced oil maintenance |
-
1991
- 1991-11-22 JP JP33439991A patent/JPH05149194A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9581106B2 (en) | 2013-07-09 | 2017-02-28 | Briggs & Stratton Corporation | Welded engine block for small internal combustion engines |
| US9856822B2 (en) | 2013-07-09 | 2018-01-02 | Briggs & Stratton Corporation | Welded engine block for small internal combustion engines |
| US9863363B2 (en) | 2013-07-09 | 2018-01-09 | Briggs & Stratton Corporation | Welded engine block for small internal combustion engines |
| US10202938B2 (en) | 2013-07-09 | 2019-02-12 | Briggs & Stratton Corporation | Welded engine block for small internal combustion engines |
| WO2016093997A1 (en) * | 2014-12-12 | 2016-06-16 | Briggs & Stratton Corporation | Welded engine block for small internal combustion engines |
| CN107208567A (en) * | 2014-12-12 | 2017-09-26 | 布里格斯斯特拉顿公司 | The welding engine body of compact internal combustion engine |
| US11761402B2 (en) | 2020-03-02 | 2023-09-19 | Briggs & Stratton, Llc | Internal combustion engine with reduced oil maintenance |
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