JP2784548B2 - Piston for internal combustion engine - Google Patents
Piston for internal combustion engineInfo
- Publication number
- JP2784548B2 JP2784548B2 JP2022137A JP2213790A JP2784548B2 JP 2784548 B2 JP2784548 B2 JP 2784548B2 JP 2022137 A JP2022137 A JP 2022137A JP 2213790 A JP2213790 A JP 2213790A JP 2784548 B2 JP2784548 B2 JP 2784548B2
- Authority
- JP
- Japan
- Prior art keywords
- piston
- annular pipe
- combustion engine
- internal combustion
- pipe
- 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
- 238000002485 combustion reaction Methods 0.000 title claims description 19
- 238000001816 cooling Methods 0.000 claims description 14
- 210000000078 claw Anatomy 0.000 description 14
- 238000005266 casting Methods 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
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関し、特にピストン
の頂部近傍に環状パイプを埋め込み、このパイプ内に冷
却油を供給して高温化するピストン頂部を冷却させる内
燃機関用ピストンに関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston for an internal combustion engine, in particular, an annular pipe is buried near the top of the piston, and cooling oil is supplied into the pipe to increase the temperature of the piston. The present invention relates to a piston for an internal combustion engine that cools an internal combustion engine.
〔従来の技術〕 一般に、内燃機関用ピストンの頂部外周に沿ってその
内部に熱伝導性の良い材料からなる環状のパイプを配置
し、このパイプ内部にピストン下方より噴射される冷却
油を導き、以てこの冷却油の冷却作用によりピストン頂
部を冷却する内燃機関用ピストンは既に知られている。
そしてこのようなピストンの製造にあたっては、環状パ
イプの外周に鋳ぐるみ用の突出爪を設け、この爪を介し
てピストン外型より環状パイプを中空に保持しながらパ
イプを鋳込む方法や（実開昭62−156147号公報）、リン
グトレーガを介してその内側にパイプを保持しながら鋳
込む方法（実開昭62−126542号公報、同63−127755号公
報）がある。(Prior art) In general, an annular pipe made of a material having good heat conductivity is arranged along the outer periphery of the top of an internal combustion engine piston, and cooling oil injected from below the piston is introduced into the pipe, A piston for an internal combustion engine that cools the top of the piston by the cooling action of the cooling oil is already known.
In manufacturing such a piston, a projecting claw for casting is provided on the outer circumference of the annular pipe, and the pipe is cast while holding the annular pipe hollow from the outer die of the piston through the claw. Japanese Patent Application Laid-Open Nos. Sho 62-156147 and No. 63-127755.
上述した前者の方法は、鋳造した後のピストン外周よ
り爪が突き出す形となるため、ピストン外周面が面一と
なるためには外周加工が必要であり、また鋳造の際には
鋳造外型と環状パイプとを橋渡しする爪部分が溶融金属
の流れを複雑にして湯回り不良を多発させたり、或いは
実際の運転時においてピストンランド部が爪の埋設によ
って損傷する恐れがある。In the former method described above, the claws protrude from the outer periphery of the piston after casting, so that the outer peripheral surface of the piston needs to be machined in order to be flush with the outer surface. The claw portion bridging the annular pipe may complicate the flow of the molten metal and cause poor running of the molten metal, or the piston land portion may be damaged by the embedding of the claw during actual operation.
またリングトレーガを介してパイプを保持する方法
は、リングトレーガを使用するピストンにしか適用でき
ず一般的とは言えない。Further, the method of holding the pipe via the ring tray can be applied only to the piston using the ring tray and is not general.
本発明は以上の問題点に鑑み、鋳造時の不良や運転時
の損傷が少なく又、広い範囲のピストンに対して適用可
能か環状パイプ装着形態を持つ内燃機関用ピストンを提
供することを目的とする。SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a piston for an internal combustion engine which has less defects during casting and damage during operation, and is applicable to a wide range of pistons or has an annular pipe mounting configuration. I do.
上記目的のため、本発明によれば、内燃機関用ピスト
ンの頂部近傍に冷却油を供給してピストンを冷却するた
めの環状パイプを、ピストン頂部近傍に埋設した内燃機
関用ピストンにおいて、 上記環状パイプに、上記ピストンの鋳造の際にピスト
ン外型内に配置されてピストン内部空間を形成するピス
トン内型に係合する係合手段を設けたことを特徴とす
る、内燃機関用ピストンが提供される。For this purpose, according to the present invention, an annular pipe for supplying cooling oil to cool the piston near the top of the piston for the internal combustion engine is provided. A piston for an internal combustion engine, provided with engaging means for engaging with a piston inner die which is arranged in the piston outer die to form a piston internal space when casting the piston. .
環状パイプに設けられた係合手段によって、環状パイ
プはピストン内型に保持されながら鋳込まれることとな
るため、環状パイプより外方に、即ちピストン外型に突
出するものはなく、従って外周加工の必要はなく湯回り
不良も発生しにくい。又、リングトレーガを用いた保持
方法ではないため広範囲のピストンに対し適用可能であ
る。Since the annular pipe is cast while being held by the inner mold of the piston by the engagement means provided on the annular pipe, there is nothing protruding outward from the annular pipe, that is, there is no projection on the outer mold of the piston. It is not necessary, and poor running water is less likely to occur. In addition, since it is not a holding method using a ring tray, it can be applied to a wide range of pistons.
以下、図面を参照して本発明の実施例を説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第１図は、第１実施例としての内燃機関用ピストンの
上視図であり、また第２図は第１図II−II線に沿ったピ
ストン断面図である。FIG. 1 is a top view of a piston for an internal combustion engine as a first embodiment, and FIG. 2 is a sectional view of the piston taken along the line II-II in FIG.
これらの図に関し、１は内燃機関用ピストン（以下、
ピストンと呼ぶ）、２はピストン１の項面に形成される
凹部、３は例えば熱伝導性の良い材料より形成される環
状パイプ、４及び５は環状パイプ３の下方、即ち図示し
ないオイルパン側部分に形成される冷却油供給穴、冷却
油排出穴をそれぞれ示している。In these figures, reference numeral 1 denotes a piston for an internal combustion engine (hereinafter referred to as a piston).
2 is a concave portion formed on the face of the piston 1, 3 is an annular pipe made of a material having good heat conductivity, 4 and 5 are below the annular pipe 3, that is, on an oil pan side (not shown). 2 shows a cooling oil supply hole and a cooling oil discharge hole formed in each portion.
第２図に示した環状パイプ３を、部分的に拡大した第
３図に具体的に示すように、本実施例によれば、係合手
段として環状パイプ３の外周にはこれを包囲するように
２個のパイプ保持部材６及び７が固定される。この保持
部材6,7は、第１図に示すように環状パイプ３の直径方
向に位置決めされ、それぞれピストン１の中央軸Ａを指
向してピストン内面1aより突出する爪部分6a,7aを備え
ている（第２図参照）。As specifically shown in FIG. 3 in which the annular pipe 3 shown in FIG. 2 is partially enlarged, according to the present embodiment, the outer circumference of the annular pipe 3 is surrounded as an engagement means. , Two pipe holding members 6 and 7 are fixed. As shown in FIG. 1, the holding members 6, 7 are provided with claw portions 6a, 7a which are positioned in the diameter direction of the annular pipe 3 and project from the inner surface 1a of the piston 1 toward the central axis A of the piston 1. (See FIG. 2).
以上説明したピストン１は、鋳型としてのピストン外
型（図示せず）とピストン内型（通常、中子と呼ばれ
る）とによって画成される空間に、例えばアルミニウム
合金等の溶融金属を注湯することにより製造される。第
４図は、本実施例によるピストン１鋳造の際、使用され
るピストン内型８の外観を示している。In the piston 1 described above, a molten metal such as an aluminum alloy is poured into a space defined by a piston outer mold (not shown) as a mold and a piston inner mold (usually called a core). It is manufactured by FIG. 4 shows the appearance of a piston inner die 8 used in casting the piston 1 according to the present embodiment.
この図から明らかなように、ピストン１（第２図）に
鋳ぐるみされることになる前記環状パイプ３は、予めピ
ストン内型８の項面8a周囲に保持され、鋳造後、ピスト
ン内型８より離脱されピストン１内部に残留することに
なる。そして環状パイプ３のピストン内型８への保持に
あたっては、鋳造前及び鋳造中にピストン内型８より環
状パイプ３が不意に脱落しないように、第５図に示す如
くピストン内型８の項面8aのエッジには、前述したパイ
プ保持部材6,7の爪部分6a,7a（第２図）が係入する凹部
9,10が形成される。As is apparent from this figure, the annular pipe 3 to be inserted into the piston 1 (FIG. 2) is held in advance around the face 8a of the inner die 8 of the piston. It will be further separated and will remain inside the piston 1. In holding the annular pipe 3 to the piston inner mold 8, as shown in FIG. 5, the surface of the piston inner mold 8 is prevented so that the annular pipe 3 does not fall off from the piston inner mold 8 before and during casting. At the edge of 8a, a recess into which the claw portions 6a, 7a (FIG. 2) of the pipe holding members 6, 7 are engaged.
9,10 are formed.
このように本実施例によれば、環状パイプ３のピスト
ン１内部への鋳ぐるみにあたっては、環状パイプ３に設
けた爪部分6a,7aを介して、予めピストン内型８で保持
する形としたため、鋳造中においては、環状パイプの爪
が外方に突出する従来のピストンと比較して、この爪部
分6a,7aによって溶融金属の湯流れが複雑になることは
なく、湯回り不良の発生頻度はかなり減少される。更
に、この爪部分6a,7aは、ピストン内型８除去後、形成
されるピストン１の内部空間11（第２図）に突出するこ
とになるため、従来ピストンと異なり爪を除去する為の
外周加工がいらず、又、実機運転時においてピストンラ
ンド部1bが損傷することもない。さらに本実施例によれ
ば、ピストン内型８による環状パイプ３保持のため、鋳
造後のピストン１においてはその内面1aに近接して環状
パイプ３が位置することになり、従って環状パイプ３と
ピストン凹部２との間の肉厚、及び環状パイプ３とピス
トン頂面との間の肉厚が十分確保され、燃焼室（図示せ
ず）で発生した熱をピストン頂面全域より環状パイプに
向け効率良く伝達することができ、冷却むらの少ないピ
ストンを提供することができる。As described above, according to the present embodiment, when the annular pipe 3 is cast into the inside of the piston 1, the annular pipe 3 is previously held by the piston inner mold 8 via the claw portions 6 a and 7 a provided on the annular pipe 3. During casting, compared to the conventional piston in which the claws of the annular pipe protrude outward, the claws 6a and 7a do not complicate the molten metal flow, and the frequency of poor run-off Is significantly reduced. Further, since the claw portions 6a and 7a protrude into the internal space 11 (FIG. 2) of the formed piston 1 after the removal of the piston inner mold 8, the outer periphery for removing the claw differs from the conventional piston. No machining is required, and the piston land portion 1b is not damaged during operation of the actual machine. Furthermore, according to the present embodiment, the annular pipe 3 is positioned close to the inner surface 1a of the cast piston 1 because the inner pipe 8 holds the annular pipe 3 by the inner die 8 of the piston. The thickness between the recess 2 and the thickness between the annular pipe 3 and the piston top surface are sufficiently ensured, and the heat generated in the combustion chamber (not shown) is directed to the annular pipe from the entire piston top surface. It is possible to provide a piston that can transmit well and has less uneven cooling.
上述した実施例はパイプ保持部材を介して環状パイプ
をピストン内型に保持するものであるが、この変形例と
しては例えば、第6,7,8図に示すように、環状パイプ12,
13及び14それ自体が係合手段としての爪部分12a,13a及
び14aを有するように形成して、ピストン内型に、それ
ぞれの爪部分に係合する凹部（第6,7図変形例の場合）
や突出ピン（第８図変形例の場合）を設けても良い。In the above-described embodiment, the annular pipe is held in the inner mold of the piston via the pipe holding member.As a modification, for example, as shown in FIGS.
13 and 14 are formed so as to have pawl portions 12a, 13a and 14a as engaging means, and are formed in the piston inner molds with concave portions (see FIG. 6 and FIG. )
Alternatively, a protruding pin (in the case of the modified example in FIG. 8) may be provided.
第9,10,11図に本発明の第２実施例を示す。 9, 10, and 11 show a second embodiment of the present invention.
前述した実施例において、係合手段は環状パイプより
突出するものであるのに対して、本実施例のそれは環状
パイプ15に形成される２個の穴（又は凹部）16及び17よ
り構成される。即ち、環状パイプ15を保持することにな
るピストン内型18（第10図に一点鎖線で示す）の頂部エ
ッジにはこの穴16,17内に係入する突起18a,18bが形成さ
れており、穴16,17と突起18a,18bとの係合関係により、
鋳造前、及び鋳造中において環状パイプ15はピストン内
型18によって保持されることになる。In the above-described embodiment, the engaging means protrudes from the annular pipe, whereas in the present embodiment, it comprises two holes (or recesses) 16 and 17 formed in the annular pipe 15. . That is, projections 18a and 18b are formed at the top edge of a piston inner die 18 (indicated by a dashed line in FIG. 10) which holds the annular pipe 15, and are engaged in the holes 16, 17. Due to the engagement relationship between the holes 16, 17 and the projections 18a, 18b,
Before and during casting, the annular pipe 15 is held by the piston inner mold 18.
尚、第9,10図に示される19は環状パイプ15に形成され
る冷却油供給穴であり、この場合前記穴16,17が冷却油
排出穴となるが、第２実施例の変形例としては前記穴1
6,17を以てこれら冷却油供給穴と冷却油排出穴を兼ねて
も良い。又、以上のように構成されるピストンの作用に
関しては、第１実施例のそれと同様であるため説明を省
略する。9 and 10, reference numeral 19 denotes a cooling oil supply hole formed in the annular pipe 15, and in this case, the holes 16, 17 serve as cooling oil discharge holes, but as a modification of the second embodiment, Is the hole 1
The cooling oil supply holes and the cooling oil discharge holes may be used as the cooling oil supply holes 6 and 17. The operation of the piston configured as described above is the same as that of the first embodiment, and thus the description is omitted.
以上、本発明の内燃機関用ピストンを種々実施例を以
て説明したが、環状パイプに設けられる係合手段（例え
ば、爪部分や穴等）の数は上記実施例に限定されるもの
ではなく、又その一も必要に応じて変更し得るものであ
る。As described above, the piston for an internal combustion engine of the present invention has been described with reference to various embodiments. However, the number of engaging means (for example, claws and holes) provided in the annular pipe is not limited to the above embodiment. One of them can be changed as needed.
以上説明したように、本発明によれば、環状パイプに
設けられた係合手段によって、環状パイプはピストン内
型に保持されながら鋳込まれることとなるため、環状パ
イプより外方に、即ちピストン外型に突出するものはな
く、従って外周加工の必要はなく湯回り不良も発生しに
くい。又、リングトレーガを用いた保持方法ではないた
め広範囲のピストンに対し適用可能であり、ピストン製
造コストも低減できる。As described above, according to the present invention, the annular pipe is cast while being held in the inner mold of the piston by the engagement means provided on the annular pipe. There is no protrusion in the outer mold, and therefore, there is no need to perform the outer peripheral processing, and poor running of the melt is unlikely to occur. In addition, since it is not a holding method using a ring tray, it can be applied to a wide range of pistons, and the piston manufacturing cost can be reduced.
第１図は本発明の第１実施例の内燃機関用ピストン上視
図；第２図は第１図II−II線に沿うピストン断面図；第
３図は第２図の部分的拡大図；第４図は第１実施例の内
燃機関用ピストン鋳造に使用されるピストン内型の外観
斜視図、第５図は第４図に示すピストン内型において環
状パイプを除去した図；第6,第７及び第８図は環状パイ
プの変形例をそれぞれ示すパイプ断面図；第９図は本発
明の第２の実施例の内燃機関用ピストン上視図；第10図
は第９図Ｘ−Ｘ線に沿った断面を示し、ピストン内型を
一点鎖線で示す図；第11図は第２実施例に使用される環
状パイプの下視図。 １……内燃機関用ピストン、 3,15……環状パイプ、6,7……パイプ保持部材、 6a,7a……爪部分、8,18……ピストン内型、 9,10……凹部、16,17……穴。1 is a top view of a piston for an internal combustion engine according to a first embodiment of the present invention; FIG. 2 is a cross-sectional view of the piston along the line II-II in FIG. 1; FIG. 3 is a partially enlarged view of FIG. FIG. 4 is an external perspective view of a piston inner mold used for casting a piston for an internal combustion engine of the first embodiment, and FIG. 5 is a view of the piston inner mold shown in FIG. 4 from which an annular pipe is removed; 7 and 8 are sectional views of pipes showing modifications of the annular pipe, respectively; FIG. 9 is a top view of a piston for an internal combustion engine according to a second embodiment of the present invention; FIG. 10 is a line XX of FIG. FIG. 11 is a cross-sectional view taken along the line A and shows the inner mold of the piston indicated by a chain line; FIG. 1 ... Piston for internal combustion engine, 3,15 ... Circular pipe, 6,7 ... Pipe holding member, 6a, 7a ... Claw, 8,18 ... Piston inner mold, 9,10 ... Recess, 16 , 17 …… Hole.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 津坂 好彦 愛知県豊田市トヨタ町１番地 トヨタ自 動車株式会社内 (72)発明者 三宅 紀明 長野県上田市常磐城２―２―43 アート 金属工業株式会社内 (56)参考文献 特開 平３−134253（ＪＰ，Ａ) 実開 昭63−4354（ＪＰ，Ｕ) 実開 昭63−127755（ＪＰ，Ｕ) 実開 昭62−156147（ＪＰ，Ｕ) 実開 昭62−126542（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) F02F 3/22 F02F 3/00──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshihiko Tsusaka 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Co., Ltd. (72) Inventor Noriaki Miyake 2-2-43 Jobanjo, Ueda City, Nagano Prefecture Art Metal Industry Co., Ltd. In-house (56) References JP-A-3-134253 (JP, A) JP-A-63-1354 (JP, U) JP-A-63-127755 (JP, U) JP-A-62-156147 (JP, U) (62) 126-126542 (JP, U) (58) Fields investigated (Int. Cl. 6 , DB name) F02F 3/22 F02F 3/00
Claims (1)
み、この環状パイプ内に冷却油を供給してピストンを冷
却する内燃機関用ピストンにおいて、 上記環状パイプに、上記ピストンの鋳造の際にピストン
外型内に配置されていピストン内部空間を形成するピス
トン内型に係合する係合手段を設けたことを特徴とす
る、内燃機関用ピストン。1. A piston for an internal combustion engine in which an annular pipe is buried near the top of a piston and cooling oil is supplied into the annular pipe to cool the piston. A piston for an internal combustion engine, characterized in that an engagement means is provided for engaging with a piston inner mold which is arranged in the mold and forms a piston internal space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022137A JP2784548B2 (en) | 1990-02-02 | 1990-02-02 | Piston for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022137A JP2784548B2 (en) | 1990-02-02 | 1990-02-02 | Piston for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03229956A JPH03229956A (en) | 1991-10-11 |
| JP2784548B2 true JP2784548B2 (en) | 1998-08-06 |
Family
ID=12074499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2022137A Expired - Lifetime JP2784548B2 (en) | 1990-02-02 | 1990-02-02 | Piston for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2784548B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4438703C2 (en) * | 1994-10-29 | 2003-12-18 | Mahle Gmbh | Light alloy pistons with cooling channel for internal combustion engines |
| JPH09287517A (en) * | 1996-04-22 | 1997-11-04 | Unisia Jecs Corp | Piston for internal combustion engine and its metal mold |
-
1990
- 1990-02-02 JP JP2022137A patent/JP2784548B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03229956A (en) | 1991-10-11 |
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