JPH04265451A - Two cycle engine piston - Google Patents
Two cycle engine pistonInfo
- Publication number
- JPH04265451A JPH04265451A JP4535191A JP4535191A JPH04265451A JP H04265451 A JPH04265451 A JP H04265451A JP 4535191 A JP4535191 A JP 4535191A JP 4535191 A JP4535191 A JP 4535191A JP H04265451 A JPH04265451 A JP H04265451A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- cavity
- sodium
- top face
- upper outer
- 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.)
- Pending
Links
- 239000011734 sodium Substances 0.000 claims abstract description 18
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 15
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 abstract description 6
- 238000002844 melting Methods 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract 1
- 239000000567 combustion gas Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
Landscapes
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、熱の拡散を向上でき
るようにした二サイクルエンジンのピストンに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston for a two-stroke engine that is capable of improving heat dissipation.
【０００２】0002
【従来の技術】二サイクルエンジンのピストンは、図４
に示すように、ピストンＡの頂面Ｂ付近の肉厚を厚くし
て、頂面Ｂが受ける燃焼圧力に耐えるようにすると共に
熱容量を大きくしている。又、四サイクルエンジン用の
ピストンでは、頂面の内側に空胴を設けて、潤滑オイル
を入れるようにして、潤滑オイルで冷却を促進するよう
にしたものがある。例えば、実開平１−１４２５４９号
公報参照。[Prior Art] The piston of a two-stroke engine is shown in Fig. 4.
As shown in the figure, the wall thickness near the top surface B of the piston A is increased to withstand the combustion pressure that the top surface B receives, and to increase the heat capacity. In addition, some pistons for four-cycle engines have a cavity inside the top surface to allow lubricating oil to enter therein, thereby promoting cooling with the lubricating oil. For example, see Utility Model Application Publication No. 1-142549.
【０００３】二サイクルエンジンのピストンは、シリン
ダー内に吸入される燃料によって冷却されていて、冷却
に限界がある。このため、冷却不足が起きて、ピストン
外周の摺動面にスカフィングが発生したりリングスティ
ックが発生するなどの不都合がある。又、ピストンの頂
面付近の肉厚を厚くすると、ピストン重量が増し、ピス
トンの往復運動のときの慣性が大きくなる不具合がある
。[0003] The piston of a two-stroke engine is cooled by the fuel sucked into the cylinder, and there is a limit to cooling. As a result, insufficient cooling occurs, causing problems such as scuffing and ring sticking on the sliding surface of the outer circumference of the piston. Further, if the wall thickness near the top surface of the piston is increased, the weight of the piston increases, and there is a problem that the inertia during reciprocating movement of the piston increases.
【０００４】かかる点に鑑み、この発明は、ピストンの
頂面付近が受ける熱を下側のスカート方向に拡散させて
冷却性を向上し、ピストン重量も軽くできる二サイクル
エンジンのピストンを得ることを目的とする。[0004] In view of this, the present invention aims to provide a piston for a two-stroke engine that can improve cooling performance and reduce the weight of the piston by diffusing the heat received near the top surface of the piston toward the lower skirt. purpose.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、この発明の二サイクルエンジンのピストンは、ピス
トンの上部外周部及び上部外周から頂面の内、少なくと
も上部外周部の内側に空胴部を設け、該空胴部に空胴部
の容積の略半分にナトリウムを封入するようにしたこと
にある。[Means for Solving the Problems] In order to achieve the above object, the piston of the two-stroke engine of the present invention has a cavity inside the upper outer periphery of the piston and the top surface from the upper outer periphery, at least inside the upper outer periphery. The present invention is characterized in that approximately half of the volume of the cavity is filled with sodium.
【０００６】[0006]
【作用】空胴部に封入したナトリウムは、９３℃の融点
であるので、ピストンの頂面が燃焼ガスの熱を受けて温
度上昇すると、ナトリウムが液化する。そして、空胴内
で液化したナトリウムが攪拌されて、頂面が受けた熱を
下部のスカート方向に拡散し、頂面の過熱を防止して適
性温度に保つことができる。こうしてピストン自体の熱
的アンバランスを解消できる。[Operation] Since the sodium sealed in the cavity has a melting point of 93°C, when the top surface of the piston receives heat from the combustion gas and rises in temperature, the sodium liquefies. Then, the liquefied sodium inside the cavity is stirred, and the heat received by the top surface is diffused toward the lower skirt, which prevents the top surface from overheating and maintains it at an appropriate temperature. In this way, the thermal imbalance of the piston itself can be resolved.
【０００７】[0007]
【実施例】以下、本発明の実施例を図１乃至図３によっ
て説明する。図１及び図２は、本発明の一実施例を示す
ものである。二サイクルエンジンのピストン１の上部外
周２の内側に、空胴部３を設ける。そして、空胴部３に
空胴部３の容積の略半分の量のナトリウム４を注入する
。ナトリウム４は空胴部３の一端に設けた注入口５から
注入して、栓６で塞いで封入する。Embodiments Hereinafter, embodiments of the present invention will be explained with reference to FIGS. 1 to 3. 1 and 2 show one embodiment of the present invention. A cavity 3 is provided inside the upper outer periphery 2 of a piston 1 of a two-stroke engine. Then, sodium 4 in an amount approximately half the volume of the cavity 3 is injected into the cavity 3. Sodium 4 is injected from an injection port 5 provided at one end of the cavity 3, and is sealed with a stopper 6.
【０００８】図３は本発明の他の実施例を示すものであ
る。この場合は、二サイクルエンジンのピストン１の上
部外周に加えて頂面７の内側にかけて空胴部３を設ける
。そして、同様に、空胴部３内に空胴部３の容積の略半
分の量のナトリウム４を注入して、栓６で塞いで封入す
る。FIG. 3 shows another embodiment of the invention. In this case, in addition to the upper outer periphery of the piston 1 of the two-stroke engine, a cavity 3 is provided extending inside the top surface 7. Similarly, sodium 4 in an amount approximately half the volume of the cavity 3 is injected into the cavity 3, and the sodium 4 is sealed with a stopper 6.
【０００９】空胴部３内に封入したナトリウム４は、９
３℃の低い融点で、ピストン１の頂面７が受ける燃焼ガ
スの熱で液化する。そして、空胴部３内をナトリウム４
が攪拌され、頂面７が受ける熱を下部のスカート方向に
拡散して、頂面７の温度を低下すると共に、ピストン１
自体の熱的アンバランスを解消できる。The sodium 4 sealed in the cavity 3 is 9
It has a low melting point of 3° C. and is liquefied by the heat of the combustion gas that the top surface 7 of the piston 1 receives. Then, the inside of the cavity 3 is filled with sodium 4
is stirred, and the heat received by the top surface 7 is diffused toward the lower skirt, lowering the temperature of the top surface 7 and increasing the temperature of the piston 1.
It can eliminate the thermal imbalance of itself.
【００１０】0010
【発明の効果】以上説明したように、この発明は上述の
ように構成したので、ピストンの上部に設けた空胴部内
に封入したナトリウムが、ピストンの温度上昇で液化し
、ピストン自体の熱的アンバランスを防ぎ、頂面の温度
を下げることができる。そして、ピストンの燃料による
冷却の負担を軽くすることができ、同じピストン重量で
は熱容量を大きくできて、ピストンを軽量化できる。
これらによって、ピストンのスカフィングなどのトラブ
ルを防止することができて、耐久性が向上する。[Effects of the Invention] As explained above, since the present invention is constructed as described above, the sodium sealed in the cavity provided in the upper part of the piston is liquefied due to the rise in the temperature of the piston, and the thermal damage of the piston itself is reduced. It prevents imbalance and lowers the temperature at the top. The burden of cooling the piston with fuel can be reduced, the heat capacity can be increased with the same piston weight, and the piston can be made lighter. These prevent troubles such as piston scuffing and improve durability.
【図１】本発明の一実施例を示す縦断正面図である。FIG. 1 is a longitudinal sectional front view showing one embodiment of the present invention.
【図２】本発明の一実施例を示す縦断側面図である。FIG. 2 is a longitudinal side view showing an embodiment of the present invention.
【図３】本発明の他の実施例を示す縦断側面図である。FIG. 3 is a longitudinal sectional side view showing another embodiment of the present invention.
【図４】従来の二サイクルエンジンのピストンを示す縦
断正面図である。FIG. 4 is a longitudinal sectional front view showing a piston of a conventional two-stroke engine.
１ ピストン ２ 上部外周 ３ 空胴部 ４ ナトリウム ７…頂面 1 Piston 2 Upper outer circumference 3 Cavity part 4 Sodium 7...Top surface
Claims (1)
ら頂面の内、少なくとも上部外周部の内側に空胴部を設
け、該空胴部に空胴部の容積の略半分にナトリウムを封
入するようにしたことを特徴とする二サイクルエンジン
のピストン。Claim 1: A cavity is provided inside the upper outer periphery of the piston and the top surface from the upper outer periphery, at least inside the upper outer periphery, and approximately half of the volume of the cavity is filled with sodium. A two-stroke engine piston characterized by the following features:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4535191A JPH04265451A (en) | 1991-02-19 | 1991-02-19 | Two cycle engine piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4535191A JPH04265451A (en) | 1991-02-19 | 1991-02-19 | Two cycle engine piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04265451A true JPH04265451A (en) | 1992-09-21 |
Family
ID=12716857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4535191A Pending JPH04265451A (en) | 1991-02-19 | 1991-02-19 | Two cycle engine piston |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04265451A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130032103A1 (en) * | 2011-08-04 | 2013-02-07 | Miguel Azevedo | Piston including a pair of cooling chambers |
| US20130206095A1 (en) * | 2012-02-10 | 2013-08-15 | Miguel Azevedo | Piston with enhanced cooling gallery |
| JP2014528040A (en) * | 2011-09-20 | 2014-10-23 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテルハフツングＭＡＨＬＥ Ｉｎｔｅｒｎａｔｉｏｎａｌ ＧｍｂＨ | Piston for use in internal combustion engine and method for manufacturing the piston |
| US8899208B2 (en) | 2010-12-18 | 2014-12-02 | Mahle International Gmbh | Internal combustion engine piston having axially extending cooling bores |
| JP2015522738A (en) * | 2012-05-05 | 2015-08-06 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテルハフツングＭＡＨＬＥ Ｉｎｔｅｒｎａｔｉｏｎａｌ ＧｍｂＨ | Assembly for an internal combustion engine comprising a piston and a crankcase |
| JP2015526643A (en) * | 2012-08-31 | 2015-09-10 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテルハフツングＭＡＨＬＥ Ｉｎｔｅｒｎａｔｉｏｎａｌ ＧｍｂＨ | Piston for internal combustion engine |
| WO2016173690A1 (en) * | 2015-04-29 | 2016-11-03 | Daimler Ag | Piston for a reciprocating piston internal combustion engine |
| CN106194657A (en) * | 2016-08-29 | 2016-12-07 | 正昌道森集团有限公司 | A kind of piston used for refrigeration compressor |
| WO2017042356A1 (en) * | 2015-09-11 | 2017-03-16 | Ks Kolbenschmidt Gmbh | Cooling of a piston by means of sodium-filled tubes |
| DE102017205451A1 (en) * | 2017-03-30 | 2018-10-04 | Mahle International Gmbh | Piston of an internal combustion engine |
-
1991
- 1991-02-19 JP JP4535191A patent/JPH04265451A/en active Pending
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8899208B2 (en) | 2010-12-18 | 2014-12-02 | Mahle International Gmbh | Internal combustion engine piston having axially extending cooling bores |
| US8544441B2 (en) * | 2011-08-04 | 2013-10-01 | Federal-Mogul Ignition Company | Piston including a pair of cooling chambers |
| US20130032103A1 (en) * | 2011-08-04 | 2013-02-07 | Miguel Azevedo | Piston including a pair of cooling chambers |
| US8869768B2 (en) | 2011-08-04 | 2014-10-28 | Federal-Mogul Corporation | Piston including a pair of cooling chambers |
| US10731599B2 (en) | 2011-09-20 | 2020-08-04 | Mahle International Gmbh | Piston for an internal combustion engine and method for producing same |
| JP2014528040A (en) * | 2011-09-20 | 2014-10-23 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテルハフツングＭＡＨＬＥ Ｉｎｔｅｒｎａｔｉｏｎａｌ ＧｍｂＨ | Piston for use in internal combustion engine and method for manufacturing the piston |
| KR20140120923A (en) * | 2012-02-10 | 2014-10-14 | 페더럴-모걸 코오포레이숀 | Piston with enhanced cooling gallery |
| JP2015511290A (en) * | 2012-02-10 | 2015-04-16 | フェデラル−モーグル コーポレイション | Piston with improved cooling cavity |
| US10753310B2 (en) | 2012-02-10 | 2020-08-25 | Tenneco Inc. | Piston with enhanced cooling gallery |
| JP2018021560A (en) * | 2012-02-10 | 2018-02-08 | フェデラル−モーグル・リミテッド・ライアビリティ・カンパニーＦｅｄｅｒａｌ−Ｍｏｇｕｌ Ｌｌｃ | Piston with enhanced cooling cavity |
| US20130206095A1 (en) * | 2012-02-10 | 2013-08-15 | Miguel Azevedo | Piston with enhanced cooling gallery |
| EP2812553B1 (en) * | 2012-02-10 | 2019-10-16 | Tenneco Inc. | Piston with enhanced cooling gallery |
| JP2015522738A (en) * | 2012-05-05 | 2015-08-06 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテルハフツングＭＡＨＬＥ Ｉｎｔｅｒｎａｔｉｏｎａｌ ＧｍｂＨ | Assembly for an internal combustion engine comprising a piston and a crankcase |
| EP2920448A2 (en) * | 2012-08-31 | 2015-09-23 | MAHLE International GmbH | Piston for an internal combustion engine |
| JP2015526643A (en) * | 2012-08-31 | 2015-09-10 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテルハフツングＭＡＨＬＥ Ｉｎｔｅｒｎａｔｉｏｎａｌ ＧｍｂＨ | Piston for internal combustion engine |
| WO2016173690A1 (en) * | 2015-04-29 | 2016-11-03 | Daimler Ag | Piston for a reciprocating piston internal combustion engine |
| WO2017042356A1 (en) * | 2015-09-11 | 2017-03-16 | Ks Kolbenschmidt Gmbh | Cooling of a piston by means of sodium-filled tubes |
| CN108026862A (en) * | 2015-09-11 | 2018-05-11 | Ks科尔本施密特有限公司 | With sodium filling pipe cooling piston |
| US10787990B2 (en) | 2015-09-11 | 2020-09-29 | Ks Kolbenschmidt Gmbh | Cooling of a piston by means of sodium-filled tubes |
| CN108026862B (en) * | 2015-09-11 | 2021-02-26 | Ks科尔本施密特有限公司 | Piston for an internal combustion engine and method for producing a piston for an internal combustion engine |
| CN106194657A (en) * | 2016-08-29 | 2016-12-07 | 正昌道森集团有限公司 | A kind of piston used for refrigeration compressor |
| DE102017205451A1 (en) * | 2017-03-30 | 2018-10-04 | Mahle International Gmbh | Piston of an internal combustion engine |
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