JPH0433397Y2 - - Google Patents
Info
- Publication number
- JPH0433397Y2 JPH0433397Y2 JP1984160573U JP16057384U JPH0433397Y2 JP H0433397 Y2 JPH0433397 Y2 JP H0433397Y2 JP 1984160573 U JP1984160573 U JP 1984160573U JP 16057384 U JP16057384 U JP 16057384U JP H0433397 Y2 JPH0433397 Y2 JP H0433397Y2
- Authority
- JP
- Japan
- Prior art keywords
- piston
- skirt
- piston crown
- heat
- spacer 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.)
- Expired
Links
- 125000006850 spacer group Chemical group 0.000 claims description 13
- 239000000919 ceramic Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 description 8
- 238000009413 insulation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 229910001026 inconel Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Landscapes
- Pistons, Piston Rings, And Cylinders (AREA)
Description
【考案の詳細な説明】
［産業上の利用分野］
本考案は内燃機関の断熱ピストンに関するもの
である。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an adiabatic piston for an internal combustion engine.
［従来の技術］
内燃機関において燃焼室の断熱化による燃焼効
率の向上を図るために、ピストンにセラミツクス
を使用したものとして、例えば実開昭55−6479号
公報に開示されるように、金属からなるスカート
部の上面に断熱シートを挾んでセラミツクスから
なるピストン冠部を重ね合せ、ボルトにより結合
したものが知られている。しかし、これはピスト
ン冠部の熱容量が大きく、スカート部との接触面
積が広いので、断熱化により燃焼室が高温になる
とスカート部の熱負荷も大きくなり、ピストンリ
ングの焼付きなどを起す恐れがある。[Prior Art] In order to improve the combustion efficiency by insulating the combustion chamber of an internal combustion engine, ceramics are used for the piston, as disclosed in Japanese Utility Model Application No. 55-6479, for example. It is known that a piston crown made of ceramics is stacked on top of a skirt part made of ceramics with a heat insulating sheet sandwiched therebetween, and the piston crown part is joined with bolts. However, since the heat capacity of the piston crown is large and the contact area with the skirt is large, if the combustion chamber becomes high temperature due to insulation, the heat load on the skirt will also increase, which may cause seizure of the piston rings. be.
また、特開昭58−25552号公報に開示されるも
のでは、ピストンがピストン冠部と保持部材とス
カート部とから構成され、ピストン冠部と保持部
材との間の上下２段に分離された重合せ面に、内
外２個の平坦で幅の広いシール部材が介装され
る。２個のシール部材の間には、ピストン冠部の
下面に形成した環状溝からなる隙間が形成される
が、これらのシール部材では接触面積が広いの
で、ピストン冠部から保持部材への伝熱を抑える
に十分とはいえない。また、上述のピストンは形
状が複雑で成形が困難であり、ピストン冠部をス
カート部に結合するボルトの締付けによる応力集
中や熱応力が生じやすく、強度上に問題がある。 Moreover, in the one disclosed in Japanese Patent Application Laid-Open No. 58-25552, the piston is composed of a piston crown, a holding member, and a skirt, and is separated into two upper and lower stages between the piston crown and the holding member. Two flat and wide seal members, an inner and an outer one, are interposed on the overlapping surfaces. A gap is formed between the two seal members by an annular groove formed on the lower surface of the piston crown, but since these seal members have a large contact area, heat transfer from the piston crown to the holding member is difficult. It cannot be said that it is sufficient to suppress the Further, the above-mentioned piston has a complicated shape and is difficult to mold, and stress concentration and thermal stress are likely to occur due to the tightening of the bolts that connect the piston crown to the skirt, resulting in problems in terms of strength.
［考案が解決しようとする問題点］
本考案の目的は、上述の問題に鑑み、製作が簡
単でピストン冠部の強度を損うことなく、スカー
ト部とピストン冠部との重合せ部に備えた断熱空
気層によりスカート部の熱負荷を低減する、内燃
機関の断熱ピストンを提供することにある。[Problems to be solved by the invention] In view of the above-mentioned problems, the purpose of the invention is to provide a structure for the overlapping part of the skirt part and the piston crown part, which is easy to manufacture and does not impair the strength of the piston crown part. An object of the present invention is to provide a heat insulating piston for an internal combustion engine, which reduces heat load on a skirt portion by a heat insulating air layer.
［問題点を解決するための手段］
上記目的を達成するために、本考案の構成は金
属からなるスカート部の外周側上面と中央上面か
ら突出する柱とに、セラミツクスからなるピスト
ン冠部の外周側下面と中央下面に設けた円筒部の
端壁とを重ね合せて、スカート部とピストン冠部
の間に環状の断熱空気層を形成し、スカート部の
柱と円筒部の端壁との間に、断熱ガスケツトと上
面に環状溝を設けたスペーサリングとを上下に重
ね合せて挾み、ボルトとナツトにより締結したも
のである。[Means for Solving the Problems] In order to achieve the above object, the structure of the present invention is such that the outer circumference of the piston crown made of ceramic is attached to the outer circumferential upper surface of the skirt portion made of metal and the pillar protruding from the central upper surface. The end wall of the cylindrical part provided on the lower side surface and the lower center surface are overlapped to form an annular heat insulating air layer between the skirt part and the piston crown, and between the column of the skirt part and the end wall of the cylindrical part. In this method, a heat insulating gasket and a spacer ring having an annular groove on the upper surface are stacked one on top of the other, sandwiched between them, and fastened with bolts and nuts.
［作用］
ピストン冠部からスカート部への伝熱は断熱ガ
スケツトによつて抑えられる。スカート部の上面
と断熱ガスケツトとの間に挟まれたスペーサリン
グは、断熱ガスケツトとスカート部との接触面積
を減じ、またスペーサリングの内側の断熱空気層
が断熱ガスケツトとスカート部との間を断熱する
ことから、スカート部の熱負荷が大幅に軽減され
る。[Operation] Heat transfer from the piston crown to the skirt is suppressed by the heat insulating gasket. The spacer ring sandwiched between the upper surface of the skirt part and the insulating gasket reduces the contact area between the insulating gasket and the skirt part, and the insulating air layer inside the spacer ring provides insulation between the insulating gasket and the skirt part. As a result, the thermal load on the skirt portion is significantly reduced.
［考案の実施例］
第１図に示すように、本考案による断熱ピスト
ンは、チツ化ケイ素などのセラミツクスからなる
ピストン冠部１と、鋳鉄、アルミニウムなどから
なりかつピストンリングを装着する溝１８を有す
るスカート部２とから構成され、両者は互いに重
ね合されて、穴１５，１４を貫通するボルト３に
皿ばね５を介してナツト４を締付けて結合され
る。[Embodiment of the invention] As shown in Fig. 1, the heat-insulating piston according to the invention has a piston crown 1 made of ceramic such as silicon nitride, and a groove 18 made of cast iron, aluminum, etc., into which a piston ring is mounted. The two skirt parts 2 are stacked on top of each other and connected by tightening nuts 4 to bolts 3 passing through holes 15 and 14 via disc springs 5.
ピストン冠部１は上面に渦流を促すくぼみ１２
を、下面に全体の肉厚を薄くし、かつ断熱空気層
９を形成する円筒部１６をそれぞれ設けられ、ピ
ストン冠部１の外周壁部は軸方向寸法を長くされ
る。ピストン冠部１の下端外周部に形成した段部
に、スカート部２の上端外周部に形成した突条１
０ないし浅い円筒部が嵌合される。さらに、スカ
ート部２の外周側上面に設けた環状溝と、ピスト
ン冠部１の外周側下面との間にシールリング８が
装着され、シールリング８により断熱空気層９が
密封される。 The piston crown 1 has a recess 12 on the upper surface that promotes vortex flow.
are each provided with a cylindrical portion 16 on the lower surface of which has a thinner overall wall thickness and forms an insulating air layer 9, and the outer circumferential wall portion of the piston crown portion 1 is lengthened in the axial direction. A protrusion 1 formed on the outer periphery of the upper end of the skirt portion 2 on a stepped portion formed on the outer periphery of the lower end of the piston crown 1
A zero or shallow cylindrical portion is fitted. Furthermore, a seal ring 8 is installed between the annular groove provided on the upper surface of the outer circumferential side of the skirt portion 2 and the lower surface of the outer circumferential side of the piston crown portion 1, and the heat insulating air layer 9 is sealed by the seal ring 8.
本考案によれば、スカート部２の中央上面から
突出する柱１３の上面と、ピストン冠部１の中央
下面に設けた円筒部１６の端壁との間に、スペー
サリング７が下側に、断熱ガスケツト６が上側に
して挟持される。スペーサリング７の材質として
は、熱伝導率の低いチタン、インコネルなどの金
属、またはチツ化ケイ素、PSZ（部分安定ジルコ
ニア）などのセラミツクスが用いられる。第３図
に示すように、断熱ガスケツト６との接触面積を
小さくするために、スペーサリング７の上面に複
数の環状溝２０を設ける。 According to the present invention, the spacer ring 7 is disposed on the lower side between the upper surface of the column 13 protruding from the upper central surface of the skirt portion 2 and the end wall of the cylindrical portion 16 provided on the lower central surface of the piston crown portion 1. The heat insulating gasket 6 is held on the upper side. As the material for the spacer ring 7, metals with low thermal conductivity such as titanium and Inconel, or ceramics such as silicon nitride and PSZ (partially stable zirconia) are used. As shown in FIG. 3, a plurality of annular grooves 20 are provided on the upper surface of the spacer ring 7 in order to reduce the contact area with the heat insulating gasket 6.
断熱ガスケツト６としては、エラストマを含浸
した石綿を用いるか、ビードを備えた複数枚の金
属板の間にエラストマまたは耐熱性接着剤を塗布
して積層したものなどを用いる。 The heat insulating gasket 6 may be made of asbestos impregnated with an elastomer, or may be made by laminating a plurality of metal plates with beads coated with an elastomer or a heat-resistant adhesive.
本考案によれば、ピストン冠部１として熱負荷
の最も高いくぼみ１２の反対側すなわち円筒部１
６の端壁に断熱ガスケツト６を当てたことによ
り、ピストン冠部１からスカート部２への伝熱が
抑えられ、加えて、スカート部２の上面と断熱ガ
スケツト６との間に、スペーサリング７を介装し
たことにより、断熱ガスケツト６との接触面積が
減じられ、かつスペーサリング７の内側に断熱空
気層１９が形成されるので、断熱効果が一層高め
られる。その結果、ピストン冠部１からスカート
部２への伝熱が抑えられ、スカート部２の温度が
油潤滑可能の値に維持される。 According to the present invention, the opposite side of the recess 12 with the highest heat load as the piston crown 1, that is, the cylindrical portion 1
By applying the heat insulating gasket 6 to the end wall of the piston 6, heat transfer from the piston crown 1 to the skirt 2 is suppressed. By interposing the spacer ring 7, the contact area with the heat insulating gasket 6 is reduced, and a heat insulating air layer 19 is formed inside the spacer ring 7, so that the heat insulating effect is further enhanced. As a result, heat transfer from the piston crown portion 1 to the skirt portion 2 is suppressed, and the temperature of the skirt portion 2 is maintained at a value that allows oil lubrication.
［考案の効果］
本考案は上述のように、普通の金属からなるス
カート部の上面とセラミツクスからなるピストン
冠部の下面との間に、スペーサリングを下側に、
断熱ガスケツトを上側にして挾んだものであるか
ら、断熱ガスケツトとスペーサリングの製作や組
付が簡単であり、スペーサリングの内側に形成さ
れる断熱空気層と、スペーサリングの上面に設け
た環状溝とにより伝熱量が抑えられ、したがつ
て、環状溝に代るものをピストン冠部に設けなく
てよいので、強度低下や熱応力の集中を排除で
き、信頼性の高い断熱ピストンを提供することが
できる。[Effects of the invention] As mentioned above, the present invention has a spacer ring on the lower side between the upper surface of the skirt made of ordinary metal and the lower surface of the piston crown made of ceramics.
Since the insulating gasket is sandwiched with the insulating gasket at the top, it is easy to manufacture and assemble the insulating gasket and spacer ring. The amount of heat transfer is suppressed by the groove, and therefore, there is no need to provide anything in place of the annular groove in the piston crown, thereby eliminating a decrease in strength and concentration of thermal stress, and providing a highly reliable heat-insulating piston. be able to.
スカート部とピストン冠部との間に設けた断熱
空気層により、ピストン冠部とスカート部との重
合せ結合部の断熱効果が向上されるので、燃焼室
の温度を高くして熱サイクルの効率を高めること
ができ、またスカート部の熱負荷が軽くなるの
で、ピストンリングの焼付きを防止できる。 The insulating air layer provided between the skirt and the piston crown improves the insulation effect of the overlapping joint between the piston crown and the skirt, increasing the temperature of the combustion chamber and increasing the efficiency of the thermal cycle. Since the heat load on the skirt portion is reduced, seizure of the piston ring can be prevented.
第１図は本考案に係る内燃機関の断熱ピストン
の正面断面図、第２図は同断熱ピストンにおける
スペーサリングの底面図、第３図は同要部を拡大
して示す正面断面図である。
１……ピストン冠部、２……スカート部、３…
…ボルト、４……ナツト、６……断熱ガスケツ
ト、７……スペーサリング、９，１９……断熱空
気層、１３……柱、１６……円筒部、２０……環
状溝。
FIG. 1 is a front sectional view of an adiabatic piston for an internal combustion engine according to the present invention, FIG. 2 is a bottom view of a spacer ring in the adiabatic piston, and FIG. 3 is an enlarged front sectional view of the main parts. 1...Piston crown part, 2...Skirt part, 3...
... Bolt, 4 ... Nut, 6 ... Heat insulation gasket, 7 ... Spacer ring, 9, 19 ... Heat insulation air layer, 13 ... Pillar, 16 ... Cylindrical part, 20 ... Annular groove.
Claims (1)
面から突出する柱とに、セラミツクスからなるピ
ストン冠部の外周側下面と中央下面に設けた円筒
部の端壁とを重ね合せて、スカート部とピストン
冠部の間に環状の断熱空気層を形成し、スカート
部の柱と円筒部の端壁との間に、断熱ガスケツト
と上面に環状溝を設けたスペーサリングとを上下
に重ね合せて挾み、ボルトとナツトにより締結し
たことを特徴とする断熱ピストン。 The outer circumferential upper surface of the metal skirt portion and the pillar protruding from the center upper surface are overlaid with the outer circumferential lower surface of the piston crown made of ceramics and the end wall of the cylindrical portion provided on the central lower surface, so that the skirt portion and the piston are combined. An annular insulating air layer is formed between the crown part, and an insulating gasket and a spacer ring with an annular groove on the top surface are stacked vertically and sandwiched between the column of the skirt part and the end wall of the cylindrical part. , an insulated piston characterized by being fastened with bolts and nuts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984160573U JPH0433397Y2 (en) | 1984-10-24 | 1984-10-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984160573U JPH0433397Y2 (en) | 1984-10-24 | 1984-10-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6174651U JPS6174651U (en) | 1986-05-20 |
| JPH0433397Y2 true JPH0433397Y2 (en) | 1992-08-11 |
Family
ID=30718497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1984160573U Expired JPH0433397Y2 (en) | 1984-10-24 | 1984-10-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0433397Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS554359B2 (en) * | 1975-06-24 | 1980-01-30 | ||
| JPS5637419A (en) * | 1979-08-31 | 1981-04-11 | Daido Steel Co Ltd | Controlling method of operation of burner in combustion furnace |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS554359U (en) * | 1978-06-26 | 1980-01-12 |
-
1984
- 1984-10-24 JP JP1984160573U patent/JPH0433397Y2/ja not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS554359B2 (en) * | 1975-06-24 | 1980-01-30 | ||
| JPS5637419A (en) * | 1979-08-31 | 1981-04-11 | Daido Steel Co Ltd | Controlling method of operation of burner in combustion furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6174651U (en) | 1986-05-20 |
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