JPS593145A - Cylinder head - Google Patents

Cylinder head

Info

Publication number
JPS593145A
JPS593145A JP11339082A JP11339082A JPS593145A JP S593145 A JPS593145 A JP S593145A JP 11339082 A JP11339082 A JP 11339082A JP 11339082 A JP11339082 A JP 11339082A JP S593145 A JPS593145 A JP S593145A
Authority
JP
Japan
Prior art keywords
heat
cylinder head
resistive plate
combustion chamber
ports
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.)
Granted
Application number
JP11339082A
Other languages
Japanese (ja)
Other versions
JPS6359022B2 (en
Inventor
Takao Tanizawa
谷沢　太加夫
Takayuki Suzuki
孝幸 鈴木
Masatomo Yuzuriha
杠　正友
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hino Motors Ltd
Original Assignee
Hino Motors Ltd
Hino Jidosha Kogyo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hino Motors Ltd, Hino Jidosha Kogyo KK filed Critical Hino Motors Ltd
Priority to JP11339082A priority Critical patent/JPS593145A/en
Publication of JPS593145A publication Critical patent/JPS593145A/en
Publication of JPS6359022B2 publication Critical patent/JPS6359022B2/ja
Granted legal-status Critical Current

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
    • F02F1/26—Cylinder heads having cooling means
    • F02F1/36—Cylinder heads having cooling means for liquid cooling
    • F02F1/38—Cylinder heads having cooling means for liquid cooling the cylinder heads being of overhead valve type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/26—Flame plate
    • 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
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis
    • 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
    • F02F2001/248—Methods for avoiding thermal stress-induced cracks in the zone between valve seat openings

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

PURPOSE:To effectively prevent between-valve crack on a cylinder head by casting a heat-resistive plate onto the surface contiguous to the combustion chamber in the cylinder head and extending said heat-resistive plate outside from the line connecting with the opened edge parts of an intake port and an exhaust port and allowing said heat-resistive plate to be exposed to the above-mentioned surface. CONSTITUTION:A cylinder head 1 is equipped with an intake port 2 and an exhaust port 3, and the respective guide holes 4 and 5 for supporting an intake valve and an exhaust valve are formed on said ports 2 and 3, and valve seats 6 and 7 are mounted onto the opended edge parts on the undersurface sides of the ports 2 and 3. In this case, a heat-resistive plate 8 is incorporated between the opened edge parts of the ports 2 and 3. In other words, the heat-resistive plate 8 is casted integrally with the cylinder head 1 when it is casted, and the heat-resistive plate 1 is installed, projecting from the undersurface of the cylinder head 1, namely the surface contiguous to a combustion chamber. The top edge of the heat-resistive plate 8 is extended outside from the line connecting the peripheral edge parts of the opened parts of the ports 2 and 3. Thus, between valves crack on the cylinder head 1 can be effectively prevented by said heat- resistive plate 8.

Description

【発明の詳細な説明】 本発明はシリンダブロックに取付けられて内燃機関を形
成するようになっているシリンダヘッドに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylinder head adapted to be mounted on a cylinder block to form an internal combustion engine.

シリンダヘッドは通常シリンダブロックの上端に取付け
られ、これによってシリンダの開放端を閉塞し、ピスト
ンとともに密閉空間から成る燃焼室をシリンダに形成す
るようになっている。そしば、特にそのエツジの部分に
ｄ３いてシリンダヘッドに亀裂が発生するという欠点を
有している。またこの耐熱板はシリンダヘッドに埋込ま
れており、その外表面は燃焼室に臨む表面には露出して
いないために十分な耐熱性が発揮されないという欠点を
有するものである。The cylinder head is usually attached to the upper end of the cylinder block, thereby closing the open end of the cylinder and forming, together with the piston, a combustion chamber consisting of a closed space in the cylinder. However, this has the disadvantage that cracks occur in the cylinder head, especially at the edges. Furthermore, this heat-resistant plate is embedded in the cylinder head, and its outer surface is not exposed to the surface facing the combustion chamber, so it has the disadvantage that sufficient heat resistance is not exhibited.

本発明はこのような問題点を克服することを目的として
なされたものであって、シリンダヘッドの母材の保護を
より完全に行なうことにより、シリンダヘッドの燃焼室
に臨む表面の亀裂を効果的に防止し、さらに耐熱板によ
る耐熱効果を高めるようにしたシリンダヘッドを提供す
ることを目的とするものである。The present invention was made with the aim of overcoming these problems, and by more completely protecting the base material of the cylinder head, it can effectively eliminate cracks on the surface of the cylinder head facing the combustion chamber. It is an object of the present invention to provide a cylinder head which prevents this from occurring and further improves the heat resistance effect of a heat resistant plate.

以下本発明を図示の一実施例につき説明する。The present invention will be explained below with reference to an illustrated embodiment.

第１図および第２図は本実施例に係るシリンダヘッド１
を示しており、このシリンダヘッド１は鋳鉄によって＆
ｆｆ！されている。そしてシリンダヘッド１には、各シ
リンダに対応してそれぞれ空洞から成る吸気ボート２お
よび排気ポート３が形成されている。そして吸気ポー１
−２および排気ポート３にはそれぞれ、吸気弁および排
気弁を支持する案内孔４．５が形成されている。またこ
れらの吸気ボート２および排気ポート３の、燃焼室に臨
む下面側の開口縁部には、バルブシート６．７がそれぞ
れ装着されている。これらのバルブシー［・６．７が上
述の吸気弁および排気弁の弁座を構成している。さらに
上記吸気ボート２および排気ポート３の開口縁部の間に
は、特に第３図に示づように耐熱板８が組込まれている
。この耐熱板８は、通常の圧ｍ鋼板、あるいは耐熱鋼板
等の耐熱性に優れた材料から構成されＣいてよい。そし
てこの耐熱板８の両側面には、上記バルブシー１〜６．
７とそれぞれ係合づる段部９が形成され、また燃料噴射
ノズルの先端部が挿入される小孔１０が形成されている
。なお第１図において鎖線１１で示す円は、シリンダの
有効径を示している。FIGS. 1 and 2 show a cylinder head 1 according to this embodiment.
The cylinder head 1 is made of cast iron.
ff! has been done. The cylinder head 1 is provided with an intake boat 2 and an exhaust port 3, which are hollow, and correspond to each cylinder. and intake port 1
-2 and the exhaust port 3 are respectively formed with guide holes 4.5 that support the intake valve and the exhaust valve. Further, valve seats 6.7 are respectively attached to the lower opening edges of the intake boat 2 and the exhaust port 3 facing the combustion chamber. These valve seats [.6.7 constitute the valve seats of the above-mentioned intake valve and exhaust valve. Furthermore, a heat-resistant plate 8 is incorporated between the opening edge of the intake boat 2 and the exhaust port 3, as shown in FIG. The heat-resistant plate 8 may be made of a material with excellent heat resistance, such as an ordinary pressurized steel plate or a heat-resistant steel plate. The above-mentioned valve seats 1 to 6 are provided on both sides of the heat-resistant plate 8.
Step portions 9 are formed to engage with the respective portions 7, and a small hole 10 into which the tip of the fuel injection nozzle is inserted is formed. Note that the circle indicated by the chain line 11 in FIG. 1 indicates the effective diameter of the cylinder.

そして上記耐熱板８は、このシリンダヘッド１の下面に
露出されている。すなわち耐熱板８はこのシリンダヘッ
ド１を鋳造する際に一緒に訪込むことによってこのシリ
ンダヘッド１に結合されている。そしてこのシリンダヘ
ッド１の下面すなわち燃焼室に臨む表面よりも突出して
耐熱板８が取付けられるようになっており、鋳造後にお
いてこのシリンダヘッド１の下面を機械加工することに
より耐熱板８の下面も一緒に機械加工されるようになっ
ている。従ってこの場合には耐熱板８の下面が一対の吸
気ボート２と排気ポート３との弁間において燃焼室に臨
む表面に直接露出することになり、特にこの部分にお１
プるシリンダヘッド１の熱亀裂に対する対策が確実に行
なわれるようになっている。The heat-resistant plate 8 is exposed on the lower surface of the cylinder head 1. That is, the heat-resistant plate 8 is joined to the cylinder head 1 by being inserted therein with the cylinder head 1 when the cylinder head 1 is cast. A heat-resistant plate 8 is attached so as to protrude from the lower surface of the cylinder head 1, that is, the surface facing the combustion chamber.By machining the lower surface of the cylinder head 1 after casting, the lower surface of the heat-resistant plate 8 is also installed. They are designed to be machined together. Therefore, in this case, the lower surface of the heat-resistant plate 8 will be directly exposed to the surface facing the combustion chamber between the pair of valves of the intake boat 2 and the exhaust port 3.
Measures against thermal cracks in the cylinder head 1 are reliably taken.

またこの耐熱板８は、第１図において鎖線１２で示すよ
うに一対のボート２．３の開口の周縁部を結ぶ線よりも
、その先端が外側に延出されており、これによって弁間
の広い範囲におけるシリンダヘッド１の保護を行なうよ
うになっている。すなわち耐熱板８の先端部１３．１４
はそれぞれ熱負荷の低くなる位置まで延出されており、
従ってこの先端部１３．１４とシリンダヘッド１との境
界部においてはシリンダヘッド１に熱亀裂を生ずること
がなく、これによってシリンダヘッド１の１０傷を効果
的に防止することが可能になる。Further, as shown by the chain line 12 in FIG. 1, the tip of the heat-resistant plate 8 extends outward from the line connecting the peripheral edges of the openings of the pair of boats 2.3, thereby extending the space between the valves. The cylinder head 1 is protected over a wide range. That is, the tip portions 13 and 14 of the heat-resistant plate 8
are each extended to a position where the heat load is low,
Therefore, thermal cracks do not occur in the cylinder head 1 at the boundary between the tip end portions 13, 14 and the cylinder head 1, and thereby it is possible to effectively prevent damage to the cylinder head 1.

次に第４図によって上記実施例の変形例を説明すると、
この変形例においてはシリンダヘッド１に一対の吸気ボ
ート２と一対の排気ポート３とがそれぞれ交互に形成さ
れている。そしてこれらの４つのボート２．３の開口縁
部の間の部分には耐熱板８が取付けられている。この場
合においても耐熱板８はシリンダヘッド１の燃焼室に臨
む表面に露出され、しかもこの耐熱板８の先端は４つの
ポー１〜２．３の開口縁部を結ぶ線１２よりも外側に延
出されている。従ってこの変形例においても、シリンダ
ヘッド１の燃焼室に臨む表面の耐熱亀裂を耐熱板８によ
って効果的に防止することが可能どなる。Next, a modification of the above embodiment will be explained with reference to FIG.
In this modification, a pair of intake boats 2 and a pair of exhaust ports 3 are alternately formed in the cylinder head 1. A heat-resistant plate 8 is attached to a portion between the opening edges of these four boats 2.3. Even in this case, the heat-resistant plate 8 is exposed on the surface facing the combustion chamber of the cylinder head 1, and the tip of the heat-resistant plate 8 extends outward from the line 12 connecting the opening edges of the four ports 1 to 2.3. It's being served. Therefore, even in this modification, it is possible to effectively prevent heat-resistant cracks on the surface of the cylinder head 1 facing the combustion chamber by the heat-resistant plate 8.

以上に述べたように本発明によれば、シリンダヘッドの
燃焼室に臨む表面にはこの表面に露出するように耐熱板
が鋳込まれており、しかしこの耐熱板の先端は吸気ボー
トと排気ポートの開口縁部を結ぶ線よりも外側に延出さ
れているために、この耐熱板によってシリンダヘッドの
弁間亀裂を効果的かつ確実に防止することができる。As described above, according to the present invention, a heat-resistant plate is cast on the surface of the cylinder head facing the combustion chamber so as to be exposed on this surface, but the tip of this heat-resistant plate is connected to the intake boat and the exhaust port. Since the heat-resistant plate extends outward from the line connecting the opening edges of the cylinder head, it is possible to effectively and reliably prevent cracks between the valves of the cylinder head.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の一実施例に係るシリンダヘッドの底面
図、第２図は第１図における■〜■線断面図、第３図は
このシリンダヘッドに鋳込まれている耐熱板の斜視図、
第４図は変形例に係るシリンダヘッドの底面図である。 なお図面に用いた符号において、 １・・・シリンダヘッド ２・・・吸気ポート ３・・・排気ポート ８・・・耐熱板 １２・・・鎖線 １３．１４・・・先端部 である。 出願人　−日野自動車工業株式会社 第１図 手続補正書醐旧 昭和５７年１０月１２日 特許庁長官殿 １、事イＩ［の表示 昭和５７年特許願第１１３３９０号 ２、発明の名称 シリンダヘッド ３、補正をする老 事件との関係　特許出願人 東京都日野市日野台３丁目１番地１ 昭和５７年９月２８日（発送口） ５、補正の対象 明ｌＩＩ店Fig. 1 is a bottom view of a cylinder head according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line ■ to x in Fig. 1, and Fig. 3 is a perspective view of a heat-resistant plate cast into this cylinder head. figure,
FIG. 4 is a bottom view of a cylinder head according to a modification. Note that the symbols used in the drawings are as follows: 1... Cylinder head 2... Intake port 3... Exhaust port 8... Heat resistant plate 12... Chain line 13, 14... Tip portion. Applicant - Hino Motors Co., Ltd. Figure 1 Procedural Amendment Form October 12, 1980 Dear Commissioner of the Japan Patent Office 1, Matters I [Indication of 1982 Patent Application No. 113390 2, Name of the invention Cylinder head 3. Relationship with the old case to be amended Patent applicant 3-1-1 Hinodai, Hino-shi, Tokyo September 28, 1980 (Shipping port) 5. Target of amendment Ming II store

Claims (1)

【特許請求の範囲】[Claims] シリンダブロックに取付けられてシリンダの一端を閉塞
し、これによって密閉空間から成る燃焼室を形成するシ
リンダヘッドにおいて、前記燃焼室に臨む表面に耐熱板
を鋳込み、この耐熱板の先端部を吸気ポートと排気ポー
トの開口縁部を結ぶ線よりも外側に延出させるとともに
、この耐熱板を前記燃焼室に臨む表面に露出させるよう
にしたことを特徴とするシリンダヘッド。In the cylinder head that is attached to the cylinder block and closes one end of the cylinder, thereby forming a combustion chamber consisting of a sealed space, a heat-resistant plate is cast on the surface facing the combustion chamber, and the tip of this heat-resistant plate is used as an intake port. A cylinder head characterized in that the heat-resistant plate extends outward from a line connecting opening edges of exhaust ports and is exposed on a surface facing the combustion chamber.
JP11339082A 1982-06-29 1982-06-29 Cylinder head Granted JPS593145A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11339082A JPS593145A (en) 1982-06-29 1982-06-29 Cylinder head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11339082A JPS593145A (en) 1982-06-29 1982-06-29 Cylinder head

Publications (2)

Publication Number Publication Date
JPS593145A true JPS593145A (en) 1984-01-09
JPS6359022B2 JPS6359022B2 (en) 1988-11-17

Family

ID=14611093

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11339082A Granted JPS593145A (en) 1982-06-29 1982-06-29 Cylinder head

Country Status (1)

Country Link
JP (1) JPS593145A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6336051A (en) * 1986-07-31 1988-02-16 Hino Motors Ltd Manufacture of heat resistant reinforced plate for cylinder head and cylinder head
JPS6338666A (en) * 1986-07-31 1988-02-19 Hino Motors Ltd Manufacture of heat resistant reinforced plate for cylinder head and cylinder head

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0260822A (en) * 1988-08-26 1990-03-01 Nissan Motor Co Ltd Mounting structure for on-vehicle auxiliary visor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6336051A (en) * 1986-07-31 1988-02-16 Hino Motors Ltd Manufacture of heat resistant reinforced plate for cylinder head and cylinder head
JPS6338666A (en) * 1986-07-31 1988-02-19 Hino Motors Ltd Manufacture of heat resistant reinforced plate for cylinder head and cylinder head

Also Published As

Publication number Publication date
JPS6359022B2 (en) 1988-11-17

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