JPH0861060A - Liquid-cooled piston - Google Patents
Liquid-cooled pistonInfo
- Publication number
- JPH0861060A JPH0861060A JP6215297A JP21529794A JPH0861060A JP H0861060 A JPH0861060 A JP H0861060A JP 6215297 A JP6215297 A JP 6215297A JP 21529794 A JP21529794 A JP 21529794A JP H0861060 A JPH0861060 A JP H0861060A
- Authority
- JP
- Japan
- Prior art keywords
- cooling chamber
- piston
- outer peripheral
- liquid
- peripheral cooling
- 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.)
- Withdrawn
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
- 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)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は内燃機関用の液冷式ピス
トンに関する。FIELD OF THE INVENTION The present invention relates to a liquid cooled piston for an internal combustion engine.
【０００２】[0002]
【従来の技術】従来の４サイクルディーゼル機関用液冷
式ピストンの１例が図３に示されている。図３におい
て、１はピストンクラウン、２はピストンクラウン１に
固着されたピストンスカート、10はピストンリング溝、
６は中央天板部1bの内側に形成された内周冷却室、５は
外周肩部1a及びピストンリング溝10の背部に形成された
外周冷却室である。2. Description of the Related Art One example of a conventional liquid-cooled piston for a 4-cycle diesel engine is shown in FIG. In FIG. 3, 1 is a piston crown, 2 is a piston skirt fixed to the piston crown 1, 10 is a piston ring groove,
Reference numeral 6 denotes an inner peripheral cooling chamber formed inside the central top plate portion 1b, and 5 denotes an outer peripheral cooling chamber formed at the outer peripheral shoulder portion 1a and the back portion of the piston ring groove 10.
【０００３】油等からなる冷却液はピストンスカート２
に穿設されて上下に伸びる複数の冷却液入口孔３を通っ
て外周冷却室５内にその下部から入り、矢印で示すよう
に流れる過程でピストンリング溝10の背部及び外周肩部
1aを冷却した後、円周方向に伸びる複数の連通孔４を通
って内周冷却室６に入る。A coolant such as oil is used for the piston skirt 2
Through the plurality of vertically extending cooling liquid inlet holes 3 into the outer peripheral cooling chamber 5 from its lower part, and in the process of flowing as shown by the arrow, the back part of the piston ring groove 10 and the outer peripheral shoulder part.
After cooling 1a, it enters the inner circumference cooling chamber 6 through a plurality of communication holes 4 extending in the circumferential direction.
【０００４】この冷却液は内周冷却室６内において気液
二相となりピストンの往復動によるシェーカー効果によ
り中央天板部1bを冷却した後、排出孔９から排出され連
接棒の冷却油通路等を通って流出する。This cooling liquid becomes gas-liquid two-phase in the inner peripheral cooling chamber 6 and cools the central top plate portion 1b by the shaker effect due to the reciprocating movement of the piston, and then is discharged from the discharge hole 9 and the cooling oil passage of the connecting rod and the like. Spill through.
【０００５】[0005]
【発明が解決しようとする課題】上記従来のピストンに
おいては、内周冷却室６内の冷却液は排出孔９が近いた
めに気液二相となり、ピストンの往復動によるシェーカ
ー効果により高い冷却性能を得ることができる。しかし
ながら、外周冷却室５内の冷却液は単相流となるため、
内周冷却室６におけるようなシェーカー効果は得られな
いので十分な冷却効果が得られない。In the above-mentioned conventional piston, the cooling liquid in the inner peripheral cooling chamber 6 becomes a gas-liquid two phase because the discharge hole 9 is close, and the cooling performance is high due to the shaker effect due to the reciprocating motion of the piston. Can be obtained. However, since the cooling liquid in the outer peripheral cooling chamber 5 becomes a single-phase flow,
Since the shaker effect as in the inner peripheral cooling chamber 6 cannot be obtained, a sufficient cooling effect cannot be obtained.
【０００６】このため、ピストンリング溝10の背部及び
外周肩部1aの温度が上昇し、熱応力の増大によるクラッ
クの発生、ピストンリング溝10の温度上昇によるピスト
ンリングの焼き付き等が発生するおそれがあった。For this reason, the temperature of the back portion of the piston ring groove 10 and the outer peripheral shoulder portion 1a rises, which may cause cracks due to an increase in thermal stress and seizure of the piston ring due to the temperature rise in the piston ring groove 10. there were.
【０００７】本発明の目的とするところは、外周冷却室
における冷却効果を向上せしめてクラックの発生を防止
するとともにピストンリングの焼き付きを防止し、耐久
性及び信頼性の大なるピストンを提供することにある。An object of the present invention is to provide a piston having improved durability and reliability by improving the cooling effect in the outer peripheral cooling chamber to prevent the occurrence of cracks and seizure of the piston ring. It is in.
【０００８】[0008]
【課題を解決するための手段】本発明の要旨とするとこ
ろは、中央天板部内側に排出孔と連通する内周冷却室が
形成され、外周肩部及びピストンリング溝の背部に冷却
液入口孔と連通する環状の外周冷却室が形成されたピス
トンにおいて、上記外周冷却室の下部と上記内周冷却室
の下部とを連通する複数の下部連通孔及び上記外周冷却
室の上部と上記内周冷却室の上部とを連通する上部連通
孔を設けたことを特徴とする液冷式ピストンにある。SUMMARY OF THE INVENTION The gist of the present invention is that an inner peripheral cooling chamber communicating with a discharge hole is formed inside a central top plate portion, and a cooling liquid inlet is provided at an outer peripheral shoulder portion and a back portion of a piston ring groove. In a piston in which an annular outer peripheral cooling chamber communicating with the hole is formed, a plurality of lower communication holes that communicate a lower portion of the outer peripheral cooling chamber and a lower portion of the inner peripheral cooling chamber, and an upper portion of the outer peripheral cooling chamber and the inner periphery. A liquid-cooled piston is characterized in that an upper communication hole that communicates with the upper portion of the cooling chamber is provided.
【０００９】[0009]
【作用】本発明においては、ピストンの往復動に伴って
冷却液に作用する加速度により内周冷却室内の気液二相
の冷却液が外周冷却室内に流入するので、外周冷却室内
におけるシェーカー効果により冷却効果が向上する。According to the present invention, the gas-liquid two-phase cooling liquid in the inner peripheral cooling chamber flows into the outer peripheral cooling chamber due to the acceleration acting on the cooling liquid as the piston reciprocates. The cooling effect is improved.
【００１０】[0010]
【実施例】図１には本発明の実施例に係る４サイクルデ
ィーゼル機関用液冷式ピストンの断面図が示されてい
る。図１において、１はピストンクラウン、1aは外周肩
部、1bは中央天板部、２はピストンクラウン１に図示し
ないボルトにより固着されたピストンスカート、10はピ
ストンリング溝である。1 is a sectional view of a liquid-cooled piston for a 4-cycle diesel engine according to an embodiment of the present invention. In FIG. 1, 1 is a piston crown, 1a is an outer peripheral shoulder portion, 1b is a central top plate portion, 2 is a piston skirt fixed to the piston crown 1 by a bolt (not shown), and 10 is a piston ring groove.
【００１１】５は外周肩部1a及びピストンリング溝10の
背部に形成された環状の外周冷却室、６は中央天板部1b
の内側に形成された内周冷却室、３はピストンスカート
２に穿設された冷却液入口孔、９は排出孔である。Reference numeral 5 denotes an outer peripheral shoulder 1a and an annular outer peripheral cooling chamber formed at the back of the piston ring groove 10, and 6 denotes a central top plate portion 1b.
An inner peripheral cooling chamber 3 formed inside is a cooling liquid inlet hole formed in the piston skirt 2, and a discharge hole 9 is formed.
【００１２】外周冷却室５の上部5aと内周冷却室６の上
部とは複数の上部連通孔７により互いに連通され、外周
冷却室５の下部5bと内周冷却室６の下部とは複数の下部
連通孔４により互いに連通されている。上部連通孔７の
外周冷却室５側開口端は可能な限り上方に、下部連通孔
４の外周冷却室５側開口端は可能な限り下部に設けるこ
とによって外周冷却室５内での冷却液の循環を促進せし
めている。また、上部連通孔７及び下部連通孔４の数及
び内径はピストンの仕様により適宜選定される。The upper part 5a of the outer peripheral cooling chamber 5 and the upper part of the inner peripheral cooling chamber 6 are communicated with each other through a plurality of upper communication holes 7, and the lower part 5b of the outer peripheral cooling chamber 5 and the lower part of the inner peripheral cooling chamber 6 are connected to each other. The lower communication holes 4 communicate with each other. By providing the opening end of the upper communication hole 7 on the outer peripheral cooling chamber 5 side as high as possible and the open end of the lower communication hole 4 on the outer peripheral cooling chamber 5 side as low as possible, It promotes circulation. Further, the numbers and inner diameters of the upper communication holes 7 and the lower communication holes 4 are appropriately selected according to the specifications of the piston.
【００１３】ディーゼル機関の運転時、冷却液は冷却液
入口孔３から外周冷却室５の下部5bに流入してピストン
リング溝10の背部及び外周肩部1aを冷却した後、上部連
通孔７及び下部連通孔４を通って内周冷却室６に流入し
て中央天板部1bを冷却し、排出孔９から排出される。During operation of the diesel engine, the cooling liquid flows from the cooling liquid inlet hole 3 into the lower portion 5b of the outer peripheral cooling chamber 5 to cool the back portion of the piston ring groove 10 and the outer peripheral shoulder portion 1a, and then the upper communicating hole 7 and After passing through the lower communication hole 4, it flows into the inner peripheral cooling chamber 6, cools the central top plate portion 1b, and is discharged from the discharge hole 9.
【００１４】本発明の作用及び効果を図２を参照しなが
ら具体的に説明する。図２の左半分には本発明に係わる
ピストンを、右半分には従来のピストンが示されてい
る。４サイクルディーゼル機関においては冷却液はポン
プにより強制的に送給されるが、この冷却液にはピスト
ンの往復動によりその上死点近傍において＋150G、下死
点近傍において-100G(但しＧは重力の加速度）の加速度
が作用する。The operation and effect of the present invention will be specifically described with reference to FIG. The piston according to the present invention is shown in the left half of FIG. 2 and the conventional piston is shown in the right half. In a 4-cycle diesel engine, the cooling liquid is forcibly sent by a pump, but this cooling liquid is + 150G near the top dead center and -100G near the bottom dead center due to the reciprocating motion of the piston (however, G is gravity. Acceleration) acts.
【００１５】従って、外周冷却室５内の冷却液にはピス
トンの上死点の近傍では上向きの加速度が作用するた
め、外周冷却室５の下部5bは低圧となり、上部5aは高圧
となる。この結果、外周冷却室５の上部5aから上部連通
孔７を通って内周冷却室６の上部へ冷却液が流れ、これ
と同時に内周冷却室６内の気液二相の冷却液がその下部
から下部連通孔４を通って外周冷却室５の下部5bへ流入
する。Therefore, since the upward acceleration acts on the coolant in the outer peripheral cooling chamber 5 in the vicinity of the top dead center of the piston, the lower portion 5b of the outer peripheral cooling chamber 5 has a low pressure and the upper portion 5a has a high pressure. As a result, the cooling liquid flows from the upper part 5a of the outer peripheral cooling chamber 5 to the upper part of the inner peripheral cooling chamber 6 through the upper communication hole 7, and at the same time, the gas-liquid two-phase cooling liquid in the inner peripheral cooling chamber 6 becomes It flows into the lower part 5b of the outer peripheral cooling chamber 5 from the lower part through the lower communication hole 4.
【００１６】ピストンの下死点近傍では、外周冷却室５
内の冷却液に下向きの加速度が作用するため上記とは逆
に冷却液が流れる。In the vicinity of the bottom dead center of the piston, the outer peripheral cooling chamber 5
Since the downward acceleration acts on the cooling liquid inside, the cooling liquid flows contrary to the above.
【００１７】このようにして内周冷却室６内の気液二相
の冷却液12が外周冷却室５内に周期的に流入するため、
外周冷却室５内の冷却液は気液二相となり、シェーカー
効果によって外周肩部1aやピストンリング溝10を効果的
に冷却する。In this way, the gas-liquid two-phase cooling liquid 12 in the inner peripheral cooling chamber 6 periodically flows into the outer peripheral cooling chamber 5,
The cooling liquid in the outer peripheral cooling chamber 5 becomes a gas-liquid two phase, and effectively cools the outer peripheral shoulder 1a and the piston ring groove 10 by the shaker effect.
【００１８】[0018]
【発明の効果】本発明によれば、外周冷却室の下部と内
周冷却室の下部とを連通する複数の下部連通孔及び外周
冷却室の上部と内周冷却室の上部とを連通する上部連通
孔を設けたため、ピストンの往復動により内周冷却室内
の気液二相の冷却液が周期的に外周冷却室に流入し外周
冷却室内の冷却液が気液二相となるのでピストン往復動
によりシェーカー効果が得られる。According to the present invention, a plurality of lower communication holes for communicating the lower part of the outer peripheral cooling chamber and the lower part of the inner peripheral cooling chamber and an upper part for communicating the upper part of the outer peripheral cooling chamber with the upper part of the inner peripheral cooling chamber. Since the communication hole is provided, the reciprocating motion of the piston causes the gas-liquid two-phase cooling liquid in the inner peripheral cooling chamber to periodically flow into the outer peripheral cooling chamber, and the cooling liquid in the outer peripheral cooling chamber becomes gas-liquid two-phase, so the piston reciprocates. Gives a shaker effect.
【００１９】この結果、外周冷却室によって高い冷却効
果を得ることができるので、ピストンの外周肩部やピス
トンリング溝を充分に冷却することができ、従って、ク
ラッチの発生やピストンリングの焼付きを防止しうる。
また、本発明のピストンは構造が極めて簡単で信頼性に
富み、従来のものに格別の費用を要せず容易に適用しう
る。As a result, since a high cooling effect can be obtained by the outer peripheral cooling chamber, it is possible to sufficiently cool the outer peripheral shoulder portion of the piston and the piston ring groove, and therefore the occurrence of the clutch and the seizure of the piston ring. It can be prevented.
Further, the piston of the present invention has an extremely simple structure and is highly reliable, and can be easily applied to the conventional piston without requiring any special cost.
【図１】本発明の１実施例に係わるディーゼル機関用の
液冷式ピストンの断面図である。FIG. 1 is a sectional view of a liquid-cooled piston for a diesel engine according to an embodiment of the present invention.
【図２】本発明と従来のピストンとの作用、効果の比較
を説明するための断面図である。FIG. 2 is a cross-sectional view for explaining a comparison of actions and effects of the present invention and a conventional piston.
【図３】従来のディーゼル機関用の液冷式ピストンの断
面図である。FIG. 3 is a sectional view of a conventional liquid-cooled piston for a diesel engine.
１ ピストンクラウン 1a 外周肩部 1b 中央天板部 ２ ピストンスカート ３ 冷却液入口孔 ４ 下部連通孔 ５ 外周冷却室 ６ 内周冷却室 ７ 上部連通孔 10 ピストンリング溝 ９ 排出孔 1 piston crown 1a outer peripheral shoulder 1b central top plate 2 piston skirt 3 coolant inlet hole 4 lower communication hole 5 outer peripheral cooling chamber 6 inner peripheral cooling chamber 7 upper communication hole 10 piston ring groove 9 discharge hole
Claims (1)
冷却室が形成され、外周肩部及びピストンリング溝の背
部に冷却液入口孔と連通する環状の外周冷却室が形成さ
れたピストンにおいて、上記外周冷却室の下部と上記内
周冷却室の下部とを連通する複数の下部連通孔及び上記
外周冷却室の上部と上記内周冷却室の上部とを連通する
上部連通孔を設けたことを特徴とする液冷式ピストン。1. An inner peripheral cooling chamber communicating with the discharge hole is formed inside the central top plate portion, and an annular outer peripheral cooling chamber communicating with the coolant inlet hole is formed at the outer peripheral shoulder portion and the back portion of the piston ring groove. The piston is provided with a plurality of lower communication holes that communicate the lower part of the outer peripheral cooling chamber and the lower part of the inner peripheral cooling chamber, and an upper communication hole that communicates the upper part of the outer peripheral cooling chamber and the upper part of the inner peripheral cooling chamber. A liquid-cooled piston that is characterized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6215297A JPH0861060A (en) | 1994-08-17 | 1994-08-17 | Liquid-cooled piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6215297A JPH0861060A (en) | 1994-08-17 | 1994-08-17 | Liquid-cooled piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0861060A true JPH0861060A (en) | 1996-03-05 |
Family
ID=16669995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6215297A Withdrawn JPH0861060A (en) | 1994-08-17 | 1994-08-17 | Liquid-cooled piston |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0861060A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010118223A3 (en) * | 2009-04-10 | 2011-01-20 | Federal-Mogul Corporation | Piston with crown cooling jet |
| JP2013539516A (en) * | 2010-08-16 | 2013-10-24 | アカーテース パワー，インク． | Piston structure for opposed piston engine |
| CN103925104A (en) * | 2014-05-07 | 2014-07-16 | 广西玉柴机器股份有限公司 | Piston cooling structure |
-
1994
- 1994-08-17 JP JP6215297A patent/JPH0861060A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010118223A3 (en) * | 2009-04-10 | 2011-01-20 | Federal-Mogul Corporation | Piston with crown cooling jet |
| CN102388213A (en) * | 2009-04-10 | 2012-03-21 | 费德罗-莫格尔公司 | Piston with crown cooling jet |
| JP2012523524A (en) * | 2009-04-10 | 2012-10-04 | フェデラル−モーグル コーポレイション | Piston with crown cooling jet |
| US8430070B2 (en) | 2009-04-10 | 2013-04-30 | Federal-Mogul Corporation | Piston with crown cooling nozzle |
| JP2013539516A (en) * | 2010-08-16 | 2013-10-24 | アカーテース パワー，インク． | Piston structure for opposed piston engine |
| CN103925104A (en) * | 2014-05-07 | 2014-07-16 | 广西玉柴机器股份有限公司 | Piston cooling structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20011106 |