JP3622445B2 - Cylinder head manufacturing method for direct injection internal combustion engine - Google Patents

Cylinder head manufacturing method for direct injection internal combustion engine Download PDF

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JP3622445B2
JP3622445B2 JP26335297A JP26335297A JP3622445B2 JP 3622445 B2 JP3622445 B2 JP 3622445B2 JP 26335297 A JP26335297 A JP 26335297A JP 26335297 A JP26335297 A JP 26335297A JP 3622445 B2 JP3622445 B2 JP 3622445B2
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cylinder head
forming core
intake port
intake
port forming
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JPH11101158A (en
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保 山谷
清 長田
弘 村越
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Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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Priority to JP26335297A priority Critical patent/JP3622445B2/en
Priority to KR1019980010295A priority patent/KR100546877B1/en
Priority to DE19813745A priority patent/DE19813745B4/en
Priority to CN98105920A priority patent/CN1105236C/en
Priority to FR9804262A priority patent/FR2768951B1/en
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/103—Multipart cores
    • 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
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder

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

Description

【０００１】
【発明の属する技術分野】
本発明は直噴式ディーゼル機関、ガソリン機関等の直噴式内燃機関のシリンダヘッド製造方法に関し、特に、鋳造製のシリンダヘッドにおける冷却水通路形成技術に関する。
【０００２】
【従来の技術】
従来、シリンダヘッドに、夫々直動式の２つの吸気弁及び２つの排気弁を備え、かつシリンダヘッドに前記４つの弁により開閉される吸気と排気の４つのポートを夫々有し、該シリンダヘッドの前記ポートの略中央部に対応する部位に燃料噴射弁を備えるようにしたセンターノズル方式の直噴式ディーゼル機関、センタープラグ方式のガソリン機関が知られている。
【０００３】
かかる直噴式内燃機関において、従来では、燃料噴射弁又はスパークプラグをシリンダヘッドに取り付ける構造として、シリンダヘッドに、燃料噴射弁本体としてのノズルホルダ又はスパークプラグの取付孔を形成したハウジングを一体成形するようにしたものが採用されている。
【０００４】
【発明が解決しようとする課題】
しかしながら、例えば、このような従来の直噴式ディーゼル機関のシリンダヘッド構造にあっては、上記のように、ノズルホルダを取り付けるためのハウジングをシリンダヘッドに一体成形した構成であるから、ハウジングの外周壁と、シリンダヘッドに一体成形されるポート壁とは一部が連接した構造とならざるを得ない。
【０００５】
このため、ハウジングの外周壁とポート壁、特に、排気ポート壁との間には、冷却水通路を形成することが困難であり、ノズルホルダ並びにポート壁、特に、排気ポート壁周りに充分な大きさの冷却水通路を確保することが困難である。
又、ノズルホルダ並びにポート壁周りに充分な大きさの冷却水通路を確保しようとした場合には、ポートの大きさを夫々縮小せざるを得なくなり、今度は機関性能に支障を来してしまう。
【０００６】
このため、従来では、冷却水ジャケット形成用中子を上下２分割して、ノズルホルダ並びにポート壁周りに充分な大きさの冷却水通路を確保することが行われている。
しかし、この方法では、生産性が悪いのは言うまでもなく、出来上がったシリンダヘッドの上下の冷却水ジャケット形成用中子の合わせ面に相当する部位にバリが発生するため、このバリを取るための面倒な後加工が必要となる欠点がある。
【０００７】
尚、シリンダヘッドの製造技術として、特開平６−３０４６９６号公報に開示された内燃機関用シリンダヘッドにおける冷却水ジャケット用中子型の成形装置並びに特開平８−２７６２４３号公報に開示されたシリンダヘッド鋳型用中子が知られているが、いずれも上述の問題点を解決し得る技術ではない。
そこで、本発明は以上のような従来の課題を解決するためなされたものであり、各気筒毎の少なくとも２つの排気弁又は吸気弁同士が、夫々クランク軸の中心軸方向に略直交する方向に並列するように配置され、燃料噴射ノズルの取付用ボスをシリンダヘッドと一体成形する構成の直噴式内燃機関のシリンダヘッド製造方法において、生産性の向上を図りつつ、冷却水通路の形成を容易化すること等を目的とする。
【０００８】
【課題を解決するための手段】
このため、本発明の一形態（請求項１）に係るシリンダヘッド製造方法は、
鋳造製のシリンダヘッドに、各気筒毎夫々２つ若しくは３つの吸気弁及び２つの排気弁を備え、かつ前記シリンダヘッドに各気筒毎前記４つ若しくは５つの弁により開閉される吸気と排気の４つ若しくは５つのポートを夫々有し、各気筒毎の２つの排気弁同士を、クランク軸の中心軸方向に略直交する方向に並列するように配置し、かつ２つの排気ポートを、各ポートのスロート部からの流れが途中で合流する単一の排気ポートとして、シリンダヘッドの側壁面に開口し、シリンダヘッドの各気筒のシリンダボアの略中心軸に直立して燃料噴射ノズルを設け、該燃料噴射ノズルの取付用ボスをシリンダヘッドと一体成形し、２つの排気ポートの各スロート部と前記燃料噴射ノズルの取付用ボスとの間に冷却水通路を形成するようにした方法であって、
鋳造時に使用する排気ポート形成用中子を冷却水ジャケット形成用中子に挿入する際に、該排気ポート形成用中子の一方の排気ポート形成部となる先端部が冷却水ジャケット形成用中子における燃料噴射ノズルの取付用ボス形成部分を通過するように、前記排気ポート形成用中子の一方の排気ポート形成部となる先端部周面の一部を平面形状にカットし、
鋳造後に、前記排気ポート形成用中子の一方の排気ポート形成部により形成された排気ポート内周面の一部に形成された平面形状部を切削して湾曲面形状に加工したことを特徴とする。
【０００９】
本発明の他の形態（請求項３）に係るシリンダヘッド製造方法は、請求項１に係る発明の方法を排気ポートに代え、吸気ポートに適用したことを特徴とする。
本発明の更に別の形態（請求項５）に係るシリンダヘッド製造方法は、
請求項１に係る発明の方法において、各気筒毎の２つ若しくは３つの吸気弁同士を、クランク軸の中心軸方向に略直交する方向に並列するように配置し、かつ２つ若しくは３つの吸気ポートを、各ポートのスロート部からの流れが途中で合流する単一の吸気ポートとして、シリンダヘッドの側壁面に開口し、２つ若しくは３つの吸気ポートの各スロート部と前記燃料噴射ノズルの取付用ボスとの間に冷却水通路を形成するようにし、
鋳造時に使用する吸気ポート形成用中子を冷却水ジャケット形成用中子に挿入する際に、該吸気ポート形成用中子の一方の吸気ポート形成部となる先端部が冷却水ジャケット形成用中子における燃料噴射ノズルの取付用ボス形成部分を通過するように、前記吸気ポート形成用中子の一方の吸気ポート形成部となる先端部周面の一部を平面形状にカットし、
鋳造後に、前記吸気ポート形成用中子の一方の吸気ポート形成部により形成された吸気ポート内周面の一部に形成された平面形状部を切削して湾曲面形状に加工したことを特徴とする。
【００１０】
かかる本発明の作用について説明する。
排気ポート形成用中子或いは吸気ポート形成用中子を冷却水ジャケット形成用中子に対して、シリンダ長手方向に対して直角に挿入することができ、排気ポート或いは吸気ポートのスロート部と燃料噴射ノズルの取付用ボスとの間に冷却水通路を形成することができる。
【００１１】
【発明の実施の形態】
以下、添付された図面を参照して本発明を詳述する。
図２及び図３において、直噴式内燃機関としての直噴式ディーゼルエンジンの鋳造製のシリンダヘッド１１には、夫々直動式の２つの吸気弁及び２つの排気弁（図示せず）が備えられ、かつ前記シリンダヘッド１１に前記４つの弁により開閉される４つのポート（吸気ポート１２，１３及び排気ポート１４Ａ，１４Ｂ）が形成されている。
【００１２】
各気筒毎の２つの吸気弁同士並びに２つの排気弁同士は、夫々クランク軸の中心軸方向に略直交する方向に並列するように配置される。
又、２つの吸気ポート１２，１３は、シリンダヘッド１１の一方の側面に開口して図示しない吸気マニホールドと連通される。
更に、２つの排気ポート１４Ａ，１４Ｂは、各ポート１４Ａ，１４Ｂのスロート部からの流れが途中が合流する単一の排気ポート１４とされ、シリンダヘッド１１の他方の側面に開口して図示しない排気マニホールドと連通される。
【００１３】
一方、シリンダヘッド１１の各気筒のシリンダボアの略中心軸に直立して図示しない燃料噴射ノズルが設けられており、該燃料噴射ノズルの取付用ボス１５はシリンダヘッド１１の鋳造時に一体成形される。
又、排気ポート１４Ａ，１４Ｂの各スロート部と燃料噴射ノズルの取付用ボス１５との間には冷却水通路１６が形成される。ここで、排気ポート１４の開口端からみて奥側の排気ポート１４Ｂは、そのスロート部において、この取付用ボス１５周りの冷却水通路１６に対して、クランク軸の中心軸方向に略直交する方向にオーバーラップしている。
【００１４】
図２において、１９，２０は夫々本実施形態における吸気ポート形成用中子である。
ここで、シリンダヘッド１１の鋳造時の排気ポート形成用中子を、冷却水ジャケット形成用中子に対して、シリンダ長手方向に対して直角に挿入する方法では、排気ポート１４Ａ，１４Ｂのスロート部と燃料噴射ノズルの取付用ボス１５との間に冷却水通路１６を形成するのが困難である（前記奥側のポートスロート部を形成する排気ポート形成用中子の挿入軌跡により冷却水通路１６を形成したい部分は全て駄肉となる）。
【００１５】
そこで、本発明のシリンダヘッド製造方法では、図１を参照すると、
（１）鋳造時に使用する排気ポート形成用中子１７を冷却水ジャケット形成用中子に挿入する際に、該排気ポート形成用中子１７の一方の排気ポート１４Ｂ形成部の先端部１７Ａが冷却水ジャケット形成用中子１８における燃料噴射ノズルの取付用ボス形成部分１８Ａを通過するように、前記排気ポート形成用中子１７の一方の排気ポート１４Ｂ形成部の先端部１７Ａ周面の一部１７ａを平面形状にカットする。図３はこの排気ポート形成用中子１７の冷却水ジャケット形成用中子１８への挿入軌跡を示している。
（２）鋳造後に、前記排気ポート形成用中子１７の一方の排気ポート１４Ｂ形成部により形成された排気ポート１４Ｂ内周面の一部に形成された平面形状部を図１及び図２の斜線部１７ｂの如くに切削して湾曲面形状に加工する。
【００１６】
これによって、排気ポート形成用中子１７を冷却水ジャケット形成用中子１８に対して、シリンダ長手方向に対して直角に挿入することができ、排気ポート１４Ａ，１４Ｂのスロート部と燃料噴射ノズルの取付用ボス１５との間に冷却水通路１６を形成することができる。
このように、単に排気ポート形成用中子１７の形状の改善により、排気ポート１４Ａ，１４Ｂのスロート部と燃料噴射ノズルの取付用ボス１５との間に冷却水通路を容易に形成できる結果、排気ポート１４Ａ，１４Ｂの大きさを夫々縮小する必要がなく、機関性能に支障を来すことがない。
【００１７】
又、従来のシリンダヘッドの鋳造型を上下２分割して、ノズルホルダ並びにポート壁周りに冷却水通路を形成するものの欠点（上下の鋳型の合わせ面にバリが発生するため、このバリを取るための面倒な後加工が必要となる）も解消できる。
尚、（２）における切削加工は、バルブシートの加工と同時に行うことができるため、特に製作工程上問題とならず、生産性を低下させるものではない。
【００１８】
ところで、吸気ポート１２，１３は排気ポート１４Ａ，１４Ｂと比較して熱負荷が少ないため、その上部に冷却水ジャケットを必要としないが、上述の排気ポート１４Ａ，１４Ｂの場合と同じようにして、吸気ポートのスロート部と燃料噴射ノズルの取付用ボスとの間に冷却水通路を形成することができる。
即ち、この場合には、各気筒毎の２つの吸気弁同士を、クランク軸の中心軸方向に略直交する方向に並列するように配置し、かつ２つの吸気ポート（一方の吸気ポートは、燃料噴射ノズルの取付用ボス周りの冷却水通路に対して、クランク軸の中心軸方向に略直交する方向にオーバーラップする）を、各ポートのスロート部からの流れが途中で合流する単一の吸気ポートとして、シリンダヘッドの側壁面に開口し、２つの吸気ポートの各スロート部と燃料噴射ノズルの取付用ボスとの間に冷却水通路を形成する。
【００１９】
そして、排気ポート形成用中子と同様に、鋳造時に使用する吸気ポート形成用中子を冷却水ジャケット形成用中子に挿入する際に、該吸気ポート形成用中子の一方の吸気ポート形成部となる先端部が冷却水ジャケット形成用中子における燃料噴射ノズルの取付用ボス形成部分を通過するように、前記吸気ポート形成用中子の一方の吸気ポート形成部となる先端部周面の一部を平面形状にカットし、鋳造後に、前記吸気ポート形成用中子の一方の吸気ポート形成部により形成された吸気ポート内周面の一部に形成された平面形状部を切削して湾曲面形状に加工すれば良い。
【００２０】
【発明の効果】
本発明によれば、直噴式内燃機関において、鋳造製シリンダヘッドを用いつつ、生産コストが有利な、シリンダヘッド一体成形式の燃料噴射ノズルの取付用ボスとした場合において、生産性を向上しつつ燃料噴射ノズル取付部周りの冷却水通路を容易に確保でき、冷却性能の向上並びに耐久性の向上を図ることができる。特に、請求項１，２，５及び６に係る発明では、排気ポートのスロート部と燃料噴射ノズルの取付用ボスとの間に冷却水通路を容易に形成でき、排気ポートは吸気ポートと比較して熱負荷が大きいため、有利である。
【図面の簡単な説明】
【図１】本発明に係る直噴式内燃機関のシリンダヘッド製造方法の一実施形態を示す鋳造用中子の部分的な概略平面図
【図２】同上の直噴式内燃機関のシリンダヘッドの平面図
【図３】図２中Ａ−Ａ矢視断面図
【符号の説明】
１１ シリンダヘッド
１２，１３ 吸気ポート
１４Ａ，１４Ｂ 排気ポート
１４ 排気ポート
１５ 燃料噴射ノズルの取付用ボス
１６ 冷却水通路
１７ 排気ポート形成用中子
１８ 冷却水ジャケット形成用中子[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a cylinder head of a direct injection internal combustion engine such as a direct injection diesel engine or a gasoline engine, and more particularly to a cooling water passage forming technique in a cast cylinder head.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a cylinder head is provided with two direct-acting intake valves and two exhaust valves, and the cylinder head has four intake and exhaust ports that are opened and closed by the four valves. There are known a center nozzle type direct injection type diesel engine and a center plug type gasoline engine provided with a fuel injection valve at a portion corresponding to a substantially central portion of the port.
[0003]
In such a direct injection internal combustion engine, conventionally, a fuel injection valve or a spark plug is attached to the cylinder head, and a housing in which a nozzle holder or a spark plug attachment hole as a fuel injection valve body is formed in the cylinder head is integrally formed. What was made is adopted.
[0004]
[Problems to be solved by the invention]
However, for example, in such a conventional direct-injection diesel engine cylinder head structure, since the housing for attaching the nozzle holder is integrally formed with the cylinder head as described above, the outer peripheral wall of the housing In addition, the port wall formed integrally with the cylinder head must be partly connected.
[0005]
For this reason, it is difficult to form a cooling water passage between the outer peripheral wall of the housing and the port wall, in particular, the exhaust port wall, and the nozzle holder and the port wall, particularly, the exhaust port wall is sufficiently large. It is difficult to secure a cooling water passage.
In addition, when trying to secure a sufficiently large cooling water passage around the nozzle holder and the port wall, the size of the port must be reduced, which in turn impedes engine performance. .
[0006]
For this reason, conventionally, a cooling water jacket forming core is divided into two parts, and a cooling water passage having a sufficiently large size is secured around the nozzle holder and the port wall.
However, in this method, it goes without saying that the productivity is poor, and burrs are generated at the portions corresponding to the mating surfaces of the cooling water jacket forming cores on the upper and lower sides of the finished cylinder head. There is a disadvantage that necessitates post-processing.
[0007]
As a cylinder head manufacturing technique, a cooling water jacket core forming apparatus in an internal combustion engine cylinder head disclosed in Japanese Patent Laid-Open No. 6-304696 and a cylinder head disclosed in Japanese Patent Laid-Open No. 8-276243 are disclosed. Although mold cores are known, none of them is a technique that can solve the above-mentioned problems.
Therefore, the present invention has been made to solve the conventional problems as described above, and at least two exhaust valves or intake valves for each cylinder are in a direction substantially orthogonal to the central axis direction of the crankshaft. In a cylinder head manufacturing method for a direct injection internal combustion engine that is arranged in parallel and in which a fuel injection nozzle mounting boss is integrally formed with the cylinder head, the formation of a cooling water passage is facilitated while improving productivity. The purpose is to do.
[0008]
[Means for Solving the Problems]
For this reason, the cylinder head manufacturing method according to an aspect of the present invention (Claim 1)
The cast cylinder head is provided with two or three intake valves and two exhaust valves for each cylinder, and the cylinder head is opened and closed by the four or five valves for each cylinder. Each having two or five ports, two exhaust valves for each cylinder are arranged in parallel in a direction substantially perpendicular to the central axis direction of the crankshaft, and the two exhaust ports are connected to each port. As a single exhaust port where the flow from the throat part merges, it opens on the side wall surface of the cylinder head, and is provided with a fuel injection nozzle upright on the substantially central axis of the cylinder bore of each cylinder of the cylinder head. the mounting boss of the nozzle molded integrally with the cylinder head, in a way which is adapted to form a cooling water passage between the two mounting boss of the fuel injection nozzle and the throat portion of the exhaust port I,
When the exhaust port forming core used for casting is inserted into the cooling water jacket forming core, one end of the exhaust port forming core serving as the exhaust port forming portion is the cooling water jacket forming core. Cut a part of the peripheral surface of the tip portion that becomes one exhaust port forming portion of the exhaust port forming core into a planar shape so as to pass through the mounting boss forming portion of the fuel injection nozzle in
After the casting, the planar shape portion formed on a part of the inner peripheral surface of the exhaust port formed by one exhaust port forming portion of the exhaust port forming core is cut into a curved surface shape. To do.
[0009]
A cylinder head manufacturing method according to another aspect of the present invention (claim 3) is characterized in that the method according to claim 1 is applied to an intake port instead of an exhaust port .
A cylinder head manufacturing method according to still another aspect of the present invention (Claim 5) ,
In the method of the invention according to claim 1, two or three intake valves for each cylinder are arranged in parallel in a direction substantially perpendicular to the central axis direction of the crankshaft, and two or three intake valves are arranged. The port is opened on the side wall surface of the cylinder head as a single intake port where the flow from the throat portion of each port merges, and the throat portions of the two or three intake ports and the fuel injection nozzle are attached. so as to form a cooling water passage between the use boss,
When the intake port forming core to be used at the time of casting is inserted into the cooling water jacket forming core, one end of the intake port forming core serving as the intake port forming portion is the cooling water jacket forming core. Cut a part of the peripheral surface of the tip portion that becomes one intake port forming portion of the intake port forming core into a planar shape so as to pass through the mounting boss forming portion of the fuel injection nozzle in
After the casting, the planar shape portion formed on a part of the inner peripheral surface of the intake port formed by one intake port forming portion of the intake port forming core is cut into a curved surface shape. To do.
[0010]
The operation of the present invention will be described.
The exhaust port forming core or the intake port forming core can be inserted into the cooling water jacket forming core at a right angle to the longitudinal direction of the cylinder, and the throat portion of the exhaust port or the intake port and the fuel injection A cooling water passage can be formed between the nozzle and the mounting boss.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
2 and 3, a cylinder head 11 made of a direct-injection diesel engine as a direct-injection internal combustion engine is provided with two direct-acting intake valves and two exhaust valves (not shown), respectively. In addition, four ports (intake ports 12 and 13 and exhaust ports 14A and 14B) that are opened and closed by the four valves are formed in the cylinder head 11.
[0012]
The two intake valves and the two exhaust valves for each cylinder are arranged in parallel in a direction substantially orthogonal to the central axis direction of the crankshaft.
The two intake ports 12 and 13 are opened on one side surface of the cylinder head 11 and communicated with an intake manifold (not shown).
Further, the two exhaust ports 14A and 14B are formed as a single exhaust port 14 in which the flows from the throat portions of the ports 14A and 14B join in the middle, and are opened on the other side surface of the cylinder head 11 and are not shown. Communicates with the manifold.
[0013]
On the other hand, a fuel injection nozzle (not shown) is provided upright on the substantially central axis of the cylinder bore of each cylinder of the cylinder head 11. The fuel injection nozzle mounting boss 15 is integrally formed when the cylinder head 11 is cast.
A cooling water passage 16 is formed between each throat portion of the exhaust ports 14A and 14B and the boss 15 for attaching the fuel injection nozzle. Here, as viewed from the opening end of the exhaust port 14, the exhaust port 14 </ b> B on the back side is a direction substantially orthogonal to the center axis direction of the crankshaft with respect to the cooling water passage 16 around the mounting boss 15 at the throat portion. Are overlapping.
[0014]
In FIG. 2, reference numerals 19 and 20 denote intake port forming cores in the present embodiment, respectively.
Here, in the method of inserting the exhaust port forming core at the time of casting of the cylinder head 11 at a right angle to the longitudinal direction of the cylinder with respect to the cooling water jacket forming core , the throat portions of the exhaust ports 14A and 14B It is difficult to form the cooling water passage 16 between the fuel injection nozzle mounting boss 15 (the cooling water passage 16 due to the insertion locus of the exhaust port forming core that forms the back port throat portion). Any part that you want to form will be trash.)
[0015]
Therefore, in the cylinder head manufacturing method of the present invention, referring to FIG.
(1) When the exhaust port forming core 17 used during casting is inserted into the cooling water jacket forming core, the distal end portion 17A of one exhaust port 14B forming portion of the exhaust port forming core 17 is cooled. A part 17a of the peripheral surface of the distal end portion 17A of one exhaust port 14B forming portion of the exhaust port forming core 17 so as to pass through the fuel injection nozzle mounting boss forming portion 18A of the water jacket forming core 18. Is cut into a planar shape. FIG. 3 shows an insertion locus of the exhaust port forming core 17 into the cooling water jacket forming core 18.
(2) After casting, a planar shape portion formed on a part of the inner peripheral surface of the exhaust port 14B formed by one exhaust port 14B forming portion of the exhaust port forming core 17 is hatched in FIG. 1 and FIG. Cut as in the portion 17b to form a curved surface.
[0016]
Thus, the exhaust port forming core 17 can be inserted into the cooling water jacket forming core 18 at a right angle to the longitudinal direction of the cylinder, and the throat portions of the exhaust ports 14A and 14B and the fuel injection nozzle A cooling water passage 16 can be formed between the mounting boss 15.
As described above, simply by improving the shape of the exhaust port forming core 17, the cooling water passage can be easily formed between the throat portions of the exhaust ports 14A and 14B and the boss 15 for mounting the fuel injection nozzle. It is not necessary to reduce the size of the ports 14A and 14B, and the engine performance is not hindered.
[0017]
In addition, the conventional cylinder head casting mold is divided into two parts on the top and bottom to form a cooling water passage around the nozzle holder and the port wall (because burrs occur on the mating surfaces of the upper and lower molds. Can be eliminated).
In addition, since the cutting in (2) can be performed simultaneously with the processing of the valve seat, there is no particular problem in the manufacturing process and the productivity is not reduced.
[0018]
By the way, since the intake ports 12 and 13 have a smaller thermal load than the exhaust ports 14A and 14B, a cooling water jacket is not required on the upper portion, but in the same manner as the exhaust ports 14A and 14B described above, A cooling water passage can be formed between the throat portion of the intake port and the mounting boss of the fuel injection nozzle.
That is, in this case, two intake valves for each cylinder are arranged in parallel in a direction substantially orthogonal to the central axis direction of the crankshaft, and two intake ports (one intake port is a fuel port) Single air intake where the flow from the throat part of each port joins the cooling water passage around the mounting boss of the injection nozzle in a direction substantially perpendicular to the center axis direction of the crankshaft) As a port, it opens to the side wall surface of the cylinder head, and a cooling water passage is formed between each throat portion of the two intake ports and the mounting boss of the fuel injection nozzle.
[0019]
And, like the exhaust port forming core, when the intake port forming core used at the time of casting is inserted into the cooling water jacket forming core, one intake port forming portion of the intake port forming core One end surface of the front end portion serving as one intake port forming portion of the intake port forming core so that the front end portion passing through the fuel injection nozzle mounting boss forming portion of the cooling water jacket forming core The surface is cut into a planar shape, and after casting, the planar shape portion formed on a part of the inner peripheral surface of the intake port formed by one intake port forming portion of the core for forming the intake port is cut to obtain a curved surface What is necessary is just to process into a shape.
[0020]
【The invention's effect】
According to the present invention, in a direct-injection internal combustion engine, when a cast cylinder head is used and a boss for mounting a fuel injection nozzle of a cylinder head integrated molding type is advantageous in terms of production cost, productivity is improved. the coolant passage around the fuel injection nozzle mounting portion can be easily secured, Ru can be improved as well as improving the durability of the cooling performance. Particularly, in the inventions according to claims 1 , 2, 5 and 6 , a cooling water passage can be easily formed between the throat portion of the exhaust port and the mounting boss of the fuel injection nozzle, and the exhaust port is compared with the intake port. This is advantageous because the heat load is large.
[Brief description of the drawings]
FIG. 1 is a partial schematic plan view of a casting core showing an embodiment of a cylinder head manufacturing method for a direct injection internal combustion engine according to the present invention. FIG. 2 is a plan view of a cylinder head of a direct injection internal combustion engine. FIG. 3 is a cross-sectional view taken along the line AA in FIG.
11 Cylinder heads 12 and 13 Intake ports 14A and 14B Exhaust port 14 Exhaust port 15 Fuel injection nozzle mounting boss 16 Cooling water passage 17 Exhaust port forming core 18 Cooling water jacket forming core

Claims (6)

鋳造製のシリンダヘッドに、各気筒毎夫々２つ若しくは３つの吸気弁及び２つの排気弁を備え、かつ前記シリンダヘッドに各気筒毎前記４つ若しくは５つの弁により開閉される吸気と排気の４つ若しくは５つのポートを夫々有し、各気筒毎の２つの排気弁同士を、クランク軸の中心軸方向に略直交する方向に並列するように配置し、かつ２つの排気ポートを、各ポートのスロート部からの流れが途中で合流する単一の排気ポートとして、シリンダヘッドの側壁面に開口し、シリンダヘッドの各気筒のシリンダボアの略中心軸に直立して燃料噴射ノズルを設け、該燃料噴射ノズルの取付用ボスをシリンダヘッドと一体成形し、２つの排気ポートの各スロート部と前記燃料噴射ノズルの取付用ボスとの間に冷却水通路を形成するようにした直噴式内燃機関のシリンダヘッドの製造方法であって、
鋳造時に使用する排気ポート形成用中子を冷却水ジャケット形成用中子に挿入する際に、該排気ポート形成用中子の一方の排気ポート形成部となる先端部が冷却水ジャケット形成用中子における燃料噴射ノズルの取付用ボス形成部分を通過するように、前記排気ポート形成用中子の一方の排気ポート形成部となる先端部周面の一部を平面形状にカットし、
鋳造後に、前記排気ポート形成用中子の一方の排気ポート形成部により形成された排気ポート内周面の一部に形成された平面形状部を切削して湾曲面形状に加工したことを特徴とする直噴式内燃機関のシリンダヘッド製造方法。The cast cylinder head is provided with two or three intake valves and two exhaust valves for each cylinder, and the cylinder head is opened and closed by the four or five valves for each cylinder. Each having two or five ports, two exhaust valves for each cylinder are arranged in parallel in a direction substantially perpendicular to the central axis direction of the crankshaft, and the two exhaust ports are connected to each port. As a single exhaust port where the flow from the throat part merges, it opens on the side wall surface of the cylinder head, and is provided with a fuel injection nozzle upright on the substantially central axis of the cylinder bore of each cylinder of the cylinder head. A direct injection type in which a nozzle mounting boss is formed integrally with a cylinder head, and a cooling water passage is formed between each throat portion of two exhaust ports and the fuel injection nozzle mounting boss. A method of manufacturing a cylinder head of the combustion engine,
When the exhaust port forming core used for casting is inserted into the cooling water jacket forming core, one end of the exhaust port forming core serving as the exhaust port forming portion is the cooling water jacket forming core. Cut a part of the peripheral surface of the tip portion that becomes one exhaust port forming portion of the exhaust port forming core into a planar shape so as to pass through the mounting boss forming portion of the fuel injection nozzle in
After the casting, the planar shape portion formed on a part of the inner peripheral surface of the exhaust port formed by one exhaust port forming portion of the exhaust port forming core is cut into a curved surface shape. A cylinder head manufacturing method for a direct injection internal combustion engine. 前記排気ポート形成用中子の先端部により形成される一方の排気ポートと、前記燃料噴射ノズルの取付用ボス周りの冷却水通路とが、クランク軸の中心軸方向に略直交する方向にオーバーラップすることを特徴とする請求項１に記載の直噴式内燃機関のシリンダヘッド製造方法。One exhaust port formed by the tip of the exhaust port forming core and the cooling water passage around the boss for mounting the fuel injection nozzle overlap in a direction substantially perpendicular to the central axis direction of the crankshaft. The cylinder head manufacturing method for a direct injection internal combustion engine according to claim 1, wherein: 鋳造製のシリンダヘッドに、各気筒毎夫々２つ若しくは３つの吸気弁及び２つの排気弁を備え、かつ前記シリンダヘッドに各気筒毎前記４つ若しくは５つの弁により開閉される吸気と排気の４つ若しくは５つのポートを夫々有し、各気筒毎の２つ若しくは３つの吸気弁同士を、クランク軸の中心軸方向に略直交する方向に並列するように配置し、かつ２つ若しくは３つの吸気ポートを、各ポートのスロート部からの流れが途中で合流する単一の吸気ポートとして、シリンダヘッドの側壁面に開口し、シリンダヘッドの各気筒のシリンダボアの略中心軸に直立して燃料噴射ノズルを設け、該燃料噴射ノズルの取付用ボスをシリンダヘッドと一体成形し、２つ若しくは３つの吸気ポートの各スロート部と前記燃料噴射ノズルの取付用ボスとの間に冷却水通路を形成するようにした直噴式内燃機関のシリンダヘッドの製造方法であって、
鋳造時に使用する吸気ポート形成用中子を冷却水ジャケット形成用中子に挿入する際に、該吸気ポート形成用中子の一方の吸気ポート形成部となる先端部が冷却水ジャケット形成用中子における燃料噴射ノズルの取付用ボス形成部分を通過するように、前記吸気ポート形成用中子の一方の吸気ポート形成部となる先端部周面の一部を平面形状にカットし、
鋳造後に、前記吸気ポート形成用中子の一方の吸気ポート形成部により形成された吸気ポート内周面の一部に形成された平面形状部を切削して湾曲面形状に加工したことを特徴とする直噴式内燃機関のシリンダヘッド製造方法。The cast cylinder head is provided with two or three intake valves and two exhaust valves for each cylinder, and the cylinder head is opened and closed by the four or five valves for each cylinder. Each having two or three ports, and two or three intake valves for each cylinder are arranged in parallel in a direction substantially perpendicular to the central axis direction of the crankshaft, and two or three intake valves A fuel injection nozzle that opens to the side wall surface of the cylinder head as a single intake port where the flow from the throat portion of each port merges in the middle and stands upright to the substantially central axis of the cylinder bore of each cylinder of the cylinder head The fuel injection nozzle mounting boss is formed integrally with the cylinder head, and between each throat portion of the two or three intake ports and the fuel injection nozzle mounting boss. A method of manufacturing a cylinder head of a direct injection internal combustion engine so as to form a 却水 passage,
When the intake port forming core to be used at the time of casting is inserted into the cooling water jacket forming core, one end of the intake port forming core serving as the intake port forming portion is the cooling water jacket forming core. Cut a part of the peripheral surface of the tip portion that becomes one intake port forming portion of the intake port forming core into a planar shape so as to pass through the mounting boss forming portion of the fuel injection nozzle in
After the casting, the planar shape portion formed on a part of the inner peripheral surface of the intake port formed by one intake port forming portion of the intake port forming core is cut into a curved surface shape. A cylinder head manufacturing method for a direct injection internal combustion engine. 前記吸気ポート形成用中子の先端部により形成される一方の吸気ポートと、前記燃料噴射ノズルの取付用ボス周りの冷却水通路とが、クランク軸の中心軸方向に略直交する方向にオーバーラップすることを特徴とする請求項３に記載の直噴式内燃機関のシリンダヘッド製造方法。One intake port formed by the tip of the intake port forming core and the cooling water passage around the mounting boss of the fuel injection nozzle overlap in a direction substantially orthogonal to the central axis direction of the crankshaft. The method of manufacturing a cylinder head for a direct injection internal combustion engine according to claim 3, wherein: 請求項１又は２に係る発明の直噴式内燃機関のシリンダヘッド製造方法に加え、各気筒毎の２つ若しくは３つの吸気弁同士を、クランク軸の中心軸方向に略直交する方向に並列するように配置し、かつ２つ若しくは３つの吸気ポートを、各ポートのスロート部からの流れが途中で合流する単一の吸気ポートとして、シリンダヘッドの側壁面に開口し、２つ若しくは３つの吸気ポートの各スロート部と前記燃料噴射ノズルの取付用ボスとの間に冷却水通路を形成するようにした直噴式内燃機関のシリンダヘッドの製造方法であって、
鋳造時に使用する吸気ポート形成用中子を冷却水ジャケット形成用中子に挿入する際に、該吸気ポート形成用中子の一方の吸気ポート形成部となる先端部が冷却水ジャケット形成用中子における燃料噴射ノズルの取付用ボス形成部分を通過するように、前記吸気ポート形成用中子の一方の吸気ポート形成部となる先端部周面の一部を平面形状にカットし、
鋳造後に、前記吸気ポート形成用中子の一方の吸気ポート形成部により形成された吸気ポート内周面の一部に形成された平面形状部を切削して湾曲面形状に加工したことを特徴とする直噴式内燃機関のシリンダヘッド製造方法。In addition to the cylinder head manufacturing method for a direct injection internal combustion engine according to the first or second aspect of the invention, two or three intake valves for each cylinder are arranged in parallel in a direction substantially perpendicular to the central axis direction of the crankshaft. And two or three intake ports are opened on the side wall surface of the cylinder head as a single intake port in which the flow from the throat portion of each port merges in the middle, and the two or three intake ports A method of manufacturing a cylinder head of a direct injection internal combustion engine in which a cooling water passage is formed between each of the throat portions and a mounting boss of the fuel injection nozzle,
When the intake port forming core to be used at the time of casting is inserted into the cooling water jacket forming core, one end of the intake port forming core serving as the intake port forming portion is the cooling water jacket forming core. Cut a part of the peripheral surface of the tip portion that becomes one intake port forming portion of the intake port forming core into a planar shape so as to pass through the mounting boss forming portion of the fuel injection nozzle in
After the casting, the planar shape portion formed on a part of the inner peripheral surface of the intake port formed by one intake port forming portion of the intake port forming core is cut into a curved surface shape. A cylinder head manufacturing method for a direct injection internal combustion engine. 前記吸気ポート形成用中子の先端部により形成される一方の吸気ポートと、前記燃料噴射ノズルの取付用ボス周りの冷却水通路とが、クランク軸の中心軸方向に略直交する方向にオーバーラップすることを特徴とする請求項５に記載の直噴式内燃機関のシリンダヘッド製造方法。One intake port formed by the tip of the intake port forming core and the cooling water passage around the mounting boss of the fuel injection nozzle overlap in a direction substantially orthogonal to the central axis direction of the crankshaft. 6. A method of manufacturing a cylinder head for a direct injection internal combustion engine according to claim 5, wherein:
JP26335297A 1997-09-29 1997-09-29 Cylinder head manufacturing method for direct injection internal combustion engine Expired - Fee Related JP3622445B2 (en)

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CN98105920A CN1105236C (en) 1997-09-29 1998-03-30 Method of manufacturing cylinder head of internal combustion engine
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