JPH03134253A - Cooling cavity-provided piston and manufacture thereof - Google Patents
Cooling cavity-provided piston and manufacture thereofInfo
- Publication number
- JPH03134253A JPH03134253A JP27031089A JP27031089A JPH03134253A JP H03134253 A JPH03134253 A JP H03134253A JP 27031089 A JP27031089 A JP 27031089A JP 27031089 A JP27031089 A JP 27031089A JP H03134253 A JPH03134253 A JP H03134253A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- ring
- pipe
- cooling cavity
- pipe ring
- 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
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 238000005266 casting Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910000679 solder Inorganic materials 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 230000005489 elastic deformation Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 8
- 150000003839 salts Chemical class 0.000 description 5
- 239000010953 base metal Substances 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002195 soluble material Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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
- F02F3/00—Pistons
- F02F3/16—Pistons having cooling means
- F02F3/20—Pistons having cooling means the means being a fluid flowing through or along piston
- F02F3/22—Pistons having cooling means the means being a fluid flowing through or along piston the fluid being liquid
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、内燃機関用ピストンにおいて、該ピストンを
冷却するための冷却油の通路をピストンヘッド部に設け
る、いわゆる冷却空洞付きピストンに関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a piston for an internal combustion engine, in which a cooling oil passage for cooling the piston is provided in the piston head, so-called a piston with a cooling cavity.
（従来の技術）
近時、エンジンの高出力化は小型エンジンにもおよび、
このため、該小型エンジンのピストンにおいても、ピス
トンヘッド部やリングランド部には高い熱負荷が加わる
。従来、小型エンジンのピストンの冷却には、冷却油を
直接ピストンの裏面に吹き付ける方法が一般的であるが
、この方法は、構造的に簡単であるという利点を有する
ものの、ピストンの肉厚が大きいと十分の冷却効果を上
げることができないという問題がある。(Conventional technology) Recently, the increase in the output of engines has spread to small engines.
Therefore, even in the piston of the small engine, a high heat load is applied to the piston head portion and ring land portion. Conventionally, the common method for cooling the pistons of small engines is to spray cooling oil directly onto the back surface of the piston, but although this method has the advantage of being structurally simple, it requires a large wall thickness of the piston. There is a problem that a sufficient cooling effect cannot be achieved.
そこで、小型エンジンにおいても、冷却効果を上げるた
めにピストンヘッド部内に冷却油の通路を設けるものが
期待されるようになった。Therefore, even in small engines, it has become desirable to provide a cooling oil passage within the piston head in order to increase the cooling effect.
この構造をもつピストンは、従来比較的大型のエンジン
に用いられており、冷却油の通路を形成する手段として
は、例えば、冷却パイプをコイル状にして鋳ぐるむもの
や、食塩のごとき溶解性物質でつくった溶出中子を用い
て形成するもの（特開昭５９−５６９６６）などが知ら
れている。Pistons with this structure have conventionally been used in relatively large engines, and the means for forming cooling oil passages include, for example, cooling pipes that are coiled and cast, or soluble materials such as salt. One is known that is formed using an elution core made of
（発明が解決しようとする課題）
前記のコイル状の冷却パイプを鋳ぐるむものは、コイル
の高さが高くなるためピストンヘッド部の肉厚がかなり
大きなピストンでなければならないと共に、冷却パイプ
内への送油機構が複雑になる難点があり、塩中子のごと
き溶出中子を用いるものは、中子が弱く、中子の製作時
や鋳型組み立て時に破損しやすい上に、塩の溶出作業の
工程が必要になり、溶出した塩の処理もしなければなら
ないという問題がある。(Problem to be Solved by the Invention) In the case of a piston that is cast around the coiled cooling pipe, the height of the coil is high, so the piston head must have a considerably thick wall, and the piston must have a large wall thickness in the piston head. The disadvantage is that the oil delivery mechanism is complicated, and those that use leached cores such as salt cores have weak cores that are easily damaged during core manufacturing or mold assembly, and the salt leaching process is difficult. There are problems in that additional steps are required and the eluted salt must also be treated.
したがって、本発明は、構造及び製造が簡単で小型のピ
ストンに適用できる冷却空洞を持つピストンを得ること
を課題とする。Therefore, it is an object of the present invention to provide a piston with a cooling cavity that is simple in structure and manufacture and can be applied to small-sized pistons.
（課題を解決するための手段）
本発明の前記課題を解決するための構造上の手段は、請
求項（１）に記載した、ピストンヘッド部に金属パイプ
を鋳ぐるんで形成した冷却空洞を有する、軽金属製の内
燃機関用の冷却空洞付きピストンにおいて、該金属パイ
プは、エンドレスのパイプリングであり、かつ鋳造後ピ
ストン内面側から開口された冷却油の入口及び出口を有
することを特徴とする構成、及び請求項（２）ないしく
６）の構成を要旨とするものであり、一方製造上の手段
は、請求項（７）に記載した、ピストンを鋳造するため
の中子の端部の側面にパイプリングの内側面に係合する
凹面を設け、該凹面でパイプリングを保持して外型内に
位置させ、鋳型空間内に溶融軽金属を注入して該パイプ
リングをピストンヘッド部内に鋳ぐるむことを特徴とす
る構成、及び請求項（８）の構成を要旨とするものであ
る。(Means for Solving the Problems) Structural means for solving the problems of the present invention include a cooling cavity formed by casting a metal pipe in the piston head portion, as set forth in claim (1). , a light metal piston with a cooling cavity for an internal combustion engine, characterized in that the metal pipe is an endless pipe ring, and has a cooling oil inlet and outlet opened from the inner surface of the piston after casting. , and the configuration of claims (2) to 6), while the manufacturing means is the side surface of the end of the core for casting a piston, as described in claim (7). A concave surface that engages with the inner surface of the pipe ring is provided, the pipe ring is held by the concave surface and positioned in the outer mold, and the pipe ring is cast into the piston head by injecting molten light metal into the mold space. The gist of the present invention is a configuration characterized by the following, and the configuration of claim (8).
（作 用）
以上のとおり、エンドレスのパイプリングを用い、かつ
鋳造後冷却油の入口及び出口を開口するから、リング状
の単純な構造の冷却空洞が得られる。また、該パイプリ
ングとしては、その内側面の少なくとも２箇所がピスト
ンの内面に露出できるリング内径の小さいものを用いる
から、リング外径も小さいものとすることができ、薄肉
のピストンであっても、ピストン外面からリング外側面
までの距離を大きくとることができ、ピストンヘッド部
に必要な肉厚をもたせることができる。そして、パイプ
リングの露出部分を中子で保持して鋳造し、離型後冷却
油の入口及び出口を穿孔することによって製品が得られ
る。(Function) As described above, since an endless pipe ring is used and the inlet and outlet for cooling oil are opened after casting, a cooling cavity with a simple ring-shaped structure can be obtained. In addition, since the pipe ring used has a small inner diameter so that at least two parts of the inner surface can be exposed to the inner surface of the piston, the outer diameter of the ring can also be small, even if the piston is thin-walled. , the distance from the outer surface of the piston to the outer surface of the ring can be increased, and the piston head can have the necessary wall thickness. Then, the exposed portion of the pipe ring is held by a core and cast, and after the mold is released, a product is obtained by drilling the inlet and outlet for cooling oil.
（実施例）
以下、図面を参照して本発明の詳細な説明する。第１図
ないし第３図で１は本発明の軽金属製のピストンであり
、２はそのピストンヘッド部、３は該ピストンヘッド部
２の側面のリングランド、４はスカート部、５はビンボ
ス、６はピン受は穴である。ピストンヘッド部２の頂部
及びリングランド３の内面側には、第４図に示すパイプ
リング７が鋳ぐるまれている。(Example) Hereinafter, the present invention will be described in detail with reference to the drawings. 1 to 3, 1 is a light metal piston of the present invention, 2 is a piston head thereof, 3 is a ring land on the side surface of the piston head 2, 4 is a skirt portion, 5 is a bottle boss, 6 The pin holder is a hole. A pipe ring 7 shown in FIG. 4 is cast into the top of the piston head 2 and the inner surface of the ring land 3.
該バイブリング７は、アルミニウム又はアルミニウム合
金製のパイプをリング状に曲げて両端をろう付けＹａし
たちのであり、リングの外径Ｄ１は、リングランド３の
肉厚Ｔによって決められ、パイプ径ｄは、必要とする冷
却油路断面積とパイプ肉厚で決まり、リング内径Ｄ２は
該Ｄ１とｄによって決められるが、該Ｄ２は、パイプリ
ング７の内側面８の少なくとも一部がピストンの内面に
若干露出できる大きさであり、適当な大きさの露出部分
を形成するために、パイプ断面を縦長または横長の略楕
円にする場合がある。The vibration ring 7 is made by bending a pipe made of aluminum or aluminum alloy into a ring shape and brazing both ends.The outer diameter D1 of the ring is determined by the wall thickness T of the ring land 3, and the pipe diameter d is determined by the required cross-sectional area of the cooling oil passage and the pipe wall thickness, and the ring inner diameter D2 is determined by D1 and d. The pipe is large enough to be slightly exposed, and in order to form an appropriately sized exposed portion, the cross section of the pipe may be made into a vertically or horizontally long approximately elliptical shape.
パイプの内面及び外面は、平滑であってもよいが、内面
及び外面の一方又は両方を梨地とすることもでき、梨地
にすると表面積が増加し伝熱性が良くなって冷却効果が
向上し、ピストン地金との結合力も増加する。地金との
結合力は、鋳造に先立って表面にハンダ層を設けておけ
ばさらに向上する。The inner and outer surfaces of the pipe may be smooth, but one or both of the inner and outer surfaces may have a satin finish, which increases the surface area, improves heat transfer, improves the cooling effect, and improves the cooling effect of the piston. The bonding strength with the base metal also increases. The bonding strength with the base metal can be further improved by providing a solder layer on the surface prior to casting.
該リング７は、ビンボス５，５間の空間９を形成するた
めの中子１０（第５図）の頂部に設けられた凹面１１．
１１に嵌着され、該凹面１１．１１は、ビンボスの中心
線０１と直交する中心線ｏ２上に位置付けされているか
ら、外型１２内に組み合わせて鋳造すると、凹面１１．
１１に接していた部分以外は地金で鋳ぐるまれ、該接し
ていた部分は、露出部８ａ、 ８ｂとなって残る。The ring 7 has a concave surface 11. provided at the top of the core 10 (FIG. 5) for forming a space 9 between the bottle bosses 5,5.
11, and the concave surface 11.11 is positioned on the center line o2 orthogonal to the center line 01 of the bottle boss, so when the combination is cast in the outer mold 12, the concave surface 11.
The parts other than the parts that were in contact with 11 are cast with bare metal, and the parts that were in contact remain as exposed parts 8a and 8b.
凹面ＬＬ、１１の係合代は僅かであるがら、強制的に中
子を引き抜くことにより露出部８ａ、８ｂを弾性変形さ
せて離型することができる。そして、適所に冷却油の入
口１３及び出口１４を穿孔すれば、冷却空洞１５ができ
あがる。この中子１ｏは金型であるが、ビンボス５がピ
ストンヘッド部２の肉と連続していない場合は、リング
内側面８全周が露出する構造にすることができ、この場
合、中子に砂型を用いると離型が容易に行なわれる。Although the engagement distance between the concave surfaces LL and 11 is small, by forcibly pulling out the core, the exposed portions 8a and 8b can be elastically deformed and released from the mold. Then, by drilling the cooling oil inlet 13 and outlet 14 at appropriate locations, a cooling cavity 15 is completed. This core 1o is a mold, but if the bottle boss 5 is not continuous with the flesh of the piston head 2, it can be structured so that the entire circumference of the inner ring surface 8 is exposed. When a sand mold is used, mold release is easily performed.
第６図のピストン１６は、頂面にバルブリセスを１７を
有し、頂壁が下方に偏位している。このため、パイプ１
８は、バルブリセスを１７近くでは横長断面１８ａ５他
の部分では縦長断面１８ｂにして冷却空洞１９を形成し
、ピストンの肉厚を維持している。The piston 16 of FIG. 6 has a valve recess 17 on the top surface, with the top wall being offset downwardly. Therefore, pipe 1
In 8, the valve recess is formed into a horizontally long cross section 18a near 17 and a vertically long cross section 18b at other parts to form a cooling cavity 19, thereby maintaining the wall thickness of the piston.
（発明の効果）
以上のように、パイプリングの内周面をピストン内面に
露出させる構造にしたから、リング外径を小さいものと
することができ、大きい断面積を持つ冷却作用の大きい
パイプリングであっても小型のピストンに適用すること
ができる効果を有する。また、パイプリングを中子で保
持して鋳造するから、塩中子のような手数のがかる手段
を用いる必要がなく、鋳造を極めて簡単に行うことがで
きる優れた効果を奏する。(Effects of the invention) As described above, since the inner peripheral surface of the pipe ring is exposed to the inner surface of the piston, the outer diameter of the ring can be made small, and the pipe ring has a large cross-sectional area and a large cooling effect. It has an effect that can be applied even to small pistons. Furthermore, since the pipe ring is held and cast with a core, there is no need to use a complicated means such as a salt core, and an excellent effect is achieved in that casting can be performed extremely easily.
第１図は本発明の実施例の縦断面図、第２図は第１図と
９０度異なる位置の縦断面図、第３図は背面図、第４図
（ａ）（ｂ）はパイプリングの平面図および縦断面図、
第５図は鋳型の縦断面図、第６図は他の実施例の縦断面
図である。
１．１６・・・ピストン
２・・・シリンダヘッド
３・・・リングランド
７．１８・・・パイプリング
８・・・内周面
１０・・・中 子
１１・・・凹 面
１５．１９・・・冷却空洞
外３名Fig. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view at a position 90 degrees different from Fig. 1, Fig. 3 is a rear view, and Fig. 4 (a) and (b) are pipe rings. plan view and longitudinal section of
FIG. 5 is a longitudinal sectional view of the mold, and FIG. 6 is a longitudinal sectional view of another embodiment. 1.16... Piston 2... Cylinder head 3... Ring land 7.18... Pipe ring 8... Inner peripheral surface 10... Core 11... Concave surface 15.19. ...3 people outside the cooling cavity
Claims (8)
した冷却空洞を有する、軽金属製の内燃機関用の冷却空
洞付きピストンにおいて、該金属パイプは、エンドレス
のパイプリングであり、かつ鋳造後ピストン内面側から
開口された冷却油の入口及び出口を有することを特徴と
する、冷却空洞付きピストン。(1) In a light metal piston with a cooling cavity for an internal combustion engine, which has a cooling cavity formed by casting a metal pipe around the piston head, the metal pipe is an endless pipe ring, and the inner surface of the piston after casting. A piston with a cooling cavity, characterized in that it has a cooling oil inlet and an outlet opened from the side.
合金で構成したことを特徴とする、請求項（１）記載の
冷却空洞付きピストン。(2) The piston with a cooling cavity according to claim (1), wherein the pipe ring is made of aluminum or an aluminum alloy.
ピストンの内面に露出させたことを特徴とする、請求項
（１）又は（２）記載の冷却空洞付きピストン。(3) At least two places on the inner surface of the pipe ring,
The piston with a cooling cavity according to claim 1 or 2, characterized in that the cooling cavity is exposed on the inner surface of the piston.
直交する中心線を横切る２箇所で、ピストンの内面に露
出させたことを特徴とする、請求項（３）記載の冷却空
洞付きピストン。(4) The piston with a cooling cavity according to claim (3), characterized in that the inner surface of the pipe ring is exposed to the inner surface of the piston at two locations crossing a center line perpendicular to the center line of the pin boss. .
、リング円周方向の位置によって変化させたことを特徴
とする、請求項（１）（２）（３）又は（４）記載の冷
却空洞付きピストン。(5) The cooling according to claim (1), (2), (3) or (4), characterized in that the shape or size of the pipe cross section of the pipe ring is changed depending on the position in the ring circumferential direction. Piston with cavity.
を梨地としたことを特徴とする、請求項（１）（２）（
３）（４）又は（５）記載の冷却空洞付きピストン。(6) Claims (1)(2)(
3) The piston with a cooling cavity described in (4) or (5).
イプリングの内側面に係合する凹面を設け、該凹面でパ
イプリングを保持して外型内に位置させ、鋳型空間内に
溶融軽金属を注入して該パイプリングをピストンヘッド
部内に鋳ぐるむことを特徴とする、冷却空洞付きピスト
ンの製造方法。(7) Provide a concave surface that engages with the inner surface of the pipe ring on the side surface of the end of the core for casting the piston, hold the pipe ring with the concave surface, position it in the outer mold, and place it in the mold space. A method for manufacturing a piston with a cooling cavity, characterized in that the pipe ring is cast into a piston head by injecting molten light metal.
ことを特徴とする、請求項（７）記載の冷却空洞付きピ
ストンの製造方法。(8) The method for manufacturing a piston with a cooling cavity according to claim (7), characterized in that a pipe ring having a solder layer formed on its surface is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1270310A JP2808147B2 (en) | 1989-10-19 | 1989-10-19 | Piston with cooling cavity and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1270310A JP2808147B2 (en) | 1989-10-19 | 1989-10-19 | Piston with cooling cavity and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03134253A true JPH03134253A (en) | 1991-06-07 |
| JP2808147B2 JP2808147B2 (en) | 1998-10-08 |
Family
ID=17484496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1270310A Expired - Fee Related JP2808147B2 (en) | 1989-10-19 | 1989-10-19 | Piston with cooling cavity and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2808147B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104061085A (en) * | 2013-03-21 | 2014-09-24 | 日立汽车系统株式会社 | Piston For Internal Combustion Engine |
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| JPS634354U (en) * | 1986-06-27 | 1988-01-12 | ||
| JPS63224858A (en) * | 1987-03-12 | 1988-09-19 | Aisin Seiki Co Ltd | Manufacture of piston for internal combustion engine |
-
1989
- 1989-10-19 JP JP1270310A patent/JP2808147B2/en not_active Expired - Fee Related
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|---|---|---|---|---|
| JPS5519490A (en) * | 1978-07-31 | 1980-02-12 | Toshiba Corp | Speed control unit of rolling mills |
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| JPS59138572A (en) * | 1983-01-27 | 1984-08-09 | アライド・コ−ポレ−ション | In-line suspension method and device for filament |
| JPS6199569A (en) * | 1984-10-23 | 1986-05-17 | Showa Alum Corp | Brazing method of aluminum and its alloy |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104061085A (en) * | 2013-03-21 | 2014-09-24 | 日立汽车系统株式会社 | Piston For Internal Combustion Engine |
| JP2014185522A (en) * | 2013-03-21 | 2014-10-02 | Hitachi Automotive Systems Ltd | Piston of internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2808147B2 (en) | 1998-10-08 |
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