JPH0435256B2 - - Google Patents
Info
- Publication number
- JPH0435256B2 JPH0435256B2 JP61152288A JP15228886A JPH0435256B2 JP H0435256 B2 JPH0435256 B2 JP H0435256B2 JP 61152288 A JP61152288 A JP 61152288A JP 15228886 A JP15228886 A JP 15228886A JP H0435256 B2 JPH0435256 B2 JP H0435256B2
- Authority
- JP
- Japan
- Prior art keywords
- fixing member
- piston
- salt core
- casting
- fixing
- 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.)
- Expired - Lifetime
Links
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は、内燃機関用ピストンの製造方法に関
するもので、特に塩中子を用いてギヤラリー部が
形成されるピストンの製造に利用される。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a method for manufacturing a piston for an internal combustion engine, and particularly to a method for manufacturing a piston in which a gear rally portion is formed using a salt core. used for.
（従来の技術）
本発明に関する従来技術としては、実公昭58−
52346号公報にて記載されたものがある。(Prior art) As the prior art related to the present invention,
There is one described in Publication No. 52346.
この従来技術は、予め冷却用空洞部とリングト
レーガーを一体に成形し、この部分をピストン本
体鋳造の際に鋳込み、一体成形されたものであ
る。 In this prior art, the cooling cavity and the ring trager are integrally molded in advance, and this part is cast into the piston body when the piston body is cast.
（発明が解決しようとする問題点）
上記従来技術のピストンは、ギヤラリー部が鋳
鉄製のため、熱伝導が悪く、また、ギヤラリー部
形成のための肉厚が必要なため、アルミ空洞と同
一の冷却効果をもたせようとすると、ギヤラリー
部が大きくなり、その分、鋳鉄部も大きくなり、
ピストン自体重いものになるという問題を有して
いる。(Problems to be Solved by the Invention) The piston of the above-mentioned prior art has a gear rally made of cast iron, which has poor heat conduction, and requires a thick wall to form the gear rally. If you try to provide a cooling effect, the gear rally part will become larger, and the cast iron part will also become larger accordingly.
The problem is that the piston itself is heavy.
本発明は、上記問題に鑑み、熱伝導の悪い冷却
部材を介することなく直接、冷却部位を冷却しか
つ、重量増にならないピストンを製造すること
を、その技術的課題とするものである。 In view of the above problems, the technical object of the present invention is to manufacture a piston that directly cools the cooling part without using a cooling member with poor heat conduction and does not increase the weight.
（問題点を解決するための手段）
上記技術的課題を解決するために講じた技術的
手段は、塩中子によつてギヤラリー部を形成する
内燃機関用ピストンの製造方法において、塩中子
を固定する固定部材は、外周部と、該外周部の内
側に延在された複数の固定足とを有し、この固定
足にて前記塩中子を取付け固定し、前記外周部を
金型にセツトして鋳造後、固定部材の外周部を切
削するようにした、ことである。
(Means for solving the problem) The technical means taken to solve the above technical problem is that the method for manufacturing a piston for an internal combustion engine in which a gear rally part is formed by a salt core is used. The fixing member to be fixed has an outer circumferential portion and a plurality of fixing legs extending inside the outer circumferential portion, the fixing legs attach and fix the salt core, and the outer circumferential portion is attached to the mold. After setting and casting, the outer periphery of the fixing member is cut.
（作用）
上記によつて熱伝導の悪いギヤラー部材を介す
ることなく、直接、冷却必要部位を冷却すること
によつて冷却効果が向上し、また、鋳造後、固定
部材の外周部は切削にて削除されるため、ピスト
ン本体への重量増を低減させることができる。(Function) As a result of the above, the cooling effect is improved by directly cooling the parts that require cooling without going through the gearer member, which has poor heat conduction.Also, after casting, the outer periphery of the fixed member is cut Since it is removed, the weight increase on the piston body can be reduced.
（実施例）
以下、本発明の実施例について図面に基づき説
明する。(Example) Hereinafter, an example of the present invention will be described based on the drawings.
第１図に示すピストン１０は、頂部１１にトツ
プランド１２、トツプリング溝１３と、トツプリ
ング溝１３の周辺に、ギヤラリー部１４が形成さ
れている。 A piston 10 shown in FIG. 1 has a top portion 11 formed with a top land 12, a top ring groove 13, and a gear rally portion 14 around the top ring groove 13.
ギヤラリー部１４は、第２図に示す円環状の塩
中子２０を固定部材２１に固定して鋳込むことに
よつて形成される。 The gear rally portion 14 is formed by fixing an annular salt core 20 shown in FIG. 2 to a fixing member 21 and casting it.
固定部材２１は、アルミナイズド処理された鉄
板製のもので、第１図、第２図に示すように円形
な外周部２２と、この外周部２２に内側に延在さ
れた先端がＳ字条に曲げられた爪部２４を有する
複数の固定足２３とが一体に形成されている。塩
中子２０はこの固定足２３の爪部２４にスナツプ
フイツトにて取付けることによつて固定される。
また、固定部材２１の外周部２２は、金型セツト
用のもので、鋳造後は、二点鎖線で示すピストン
の外径２５と同一の位置迄切削にて削り取られる
ため、製品状態では削除される。 The fixing member 21 is made of an aluminized iron plate, and as shown in FIGS. 1 and 2, has a circular outer circumference 22 and an S-shaped tip extending inward from the outer circumference 22. A plurality of fixed feet 23 having bent claw portions 24 are integrally formed. The salt core 20 is fixed by being attached to the claw portion 24 of the fixed foot 23 with a snap fit.
Furthermore, the outer peripheral part 22 of the fixing member 21 is for setting the mold, and after casting, it is removed by cutting to the same position as the outer diameter 25 of the piston shown by the two-dot chain line, so it is not removed in the product state. Ru.
前記固定部材２１に取付けられた塩中子２０は
ピストン本体に鋳込まれる。 The salt core 20 attached to the fixing member 21 is cast into the piston body.
鋳造後、塩中子２０は、第３図に示すオイル孔
１５，１６がドリル加工にて穴明けされ、穴明け
後、このオイル穴１５，１６に水を注入して塩中
子２０を溶かすことによつてギヤラリー部１４が
形成され、更に前記固定部材２１の外周部２２が
切削にて削除される。 After casting, the salt core 20 is drilled with oil holes 15 and 16 shown in FIG. 3, and after drilling, water is injected into the oil holes 15 and 16 to dissolve the salt core 20. As a result, a gear rally portion 14 is formed, and further, the outer peripheral portion 22 of the fixing member 21 is removed by cutting.
以上の方法によつてギヤラリー部が形成された
ピストンは、熱伝導の悪いギヤラリー部材を介す
ることなく、直接、冷却が必要なトツプリング溝
１３周辺を冷却することができるため、冷却効率
が向上し、また、鋳造時、塩中子を固定する固定
部材の外周部は、鋳造後、通常のピストン外周仕
上げ工程において切削され、特別な工程を要する
ことなく製品状態では削除されるため、重量増へ
の影響は少ない。
The piston in which the gear rally portion is formed by the above method can directly cool the area around the top ring groove 13, which requires cooling, without going through the gear rally member, which has poor heat conduction, so cooling efficiency is improved. Also, during casting, the outer periphery of the fixing member that fixes the salt core is cut in the normal piston outer periphery finishing process after casting, and is removed in the product state without any special process, resulting in an increase in weight. The impact is small.
また、冷却効率の向上によつて、熱膨張が低減
されるため、従来設けられている熱膨張抑制用の
ストラツトの廃止が可能となり、軽量化、コスト
ダウンが得られる。更に、中子を固定する固定足
はピストン製品内に残す構成をとつているので、
鋳造後中子は溶解されるために固定足と中子を切
り離す必要がない。従つて、中子と固定足との間
のはめ合いに起因する中子の破壊や不要バリの除
去工程が不要となる。 Furthermore, since thermal expansion is reduced by improving cooling efficiency, it is possible to eliminate the conventional struts for suppressing thermal expansion, resulting in weight reduction and cost reduction. Furthermore, the fixing feet that fix the core are left inside the piston product, so
Since the core is melted after casting, there is no need to separate the fixing feet and the core. Therefore, there is no need to destroy the core or remove unnecessary burrs due to the fit between the core and the fixed foot.
第１図は、本発明の実施例によるピストンの縦
断面図、第２図は塩中子を固定した固定部材の平
面図、第３図は本発明の実施例によるピストンの
下面視図である。
１０……ピストン、１４……ギヤラリー部、２
０……塩中子、２１……固定部材、２２……固定
部材の外周部、２３……固定部材の固定足、２４
……固定部材の爪部。
FIG. 1 is a longitudinal sectional view of a piston according to an embodiment of the present invention, FIG. 2 is a plan view of a fixing member to which a salt core is fixed, and FIG. 3 is a bottom view of a piston according to an embodiment of the present invention. . 10... Piston, 14... Gear rally section, 2
0...Salt core, 21...Fixing member, 22...Outer periphery of the fixing member, 23...Fixing foot of the fixing member, 24
...The claw part of the fixing member.
Claims (1)
し、鋳造後、水を注入し、塩中子を溶かすことに
よつてギヤラリー部が形成される内燃機関用ピス
トンの製造方法において、 前記固定部材は、外周部と、該外周部の内側に
延在された複数の固定足とを有し、該固定足にて
前記塩中子を取付け固定し、前記外周部を金型に
セツトして鋳造後前記固定部材の外周部を切削す
る、内燃機関用ピストンの製造方法。[Claims] 1. A piston for an internal combustion engine in which a gear rally portion is formed by attaching a salt core to a fixing member and setting it in a mold, and after casting, injecting water and melting the salt core. In the manufacturing method, the fixing member has an outer circumferential portion and a plurality of fixing legs extending inside the outer circumferential portion, the fixing legs attach and fix the salt core, and the outer circumferential portion is fixed. A method of manufacturing a piston for an internal combustion engine, which comprises setting the fixing member in a mold and cutting the outer peripheral part of the fixing member after casting.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15228886A JPS6310043A (en) | 1986-06-27 | 1986-06-27 | Manufacture of piston for internal combustion engine |
| DE19873721021 DE3721021A1 (en) | 1986-06-27 | 1987-06-25 | METHOD FOR PRODUCING AN INTERNAL COMBUSTION ENGINE PISTON |
| US07/066,714 US4776075A (en) | 1986-06-27 | 1987-06-26 | Method for manufacturing piston of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15228886A JPS6310043A (en) | 1986-06-27 | 1986-06-27 | Manufacture of piston for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6310043A JPS6310043A (en) | 1988-01-16 |
| JPH0435256B2 true JPH0435256B2 (en) | 1992-06-10 |
Family
ID=15537245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15228886A Granted JPS6310043A (en) | 1986-06-27 | 1986-06-27 | Manufacture of piston for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6310043A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0619953U (en) * | 1992-08-11 | 1994-03-15 | 株式会社ユニシアジェックス | Support structure for the soluble core of the piston |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS563096Y2 (en) * | 1976-11-12 | 1981-01-23 | ||
| JPS59143550U (en) * | 1983-03-15 | 1984-09-26 | トヨタ自動車株式会社 | Intake manifold core mold |
| JPS611446A (en) * | 1984-06-13 | 1986-01-07 | Izumi Jidosha Kogyo Kk | Production of piston for internal-combustion engine |
-
1986
- 1986-06-27 JP JP15228886A patent/JPS6310043A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6310043A (en) | 1988-01-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |