JPH0154539B2 - - Google Patents
Info
- Publication number
- JPH0154539B2 JPH0154539B2 JP21434785A JP21434785A JPH0154539B2 JP H0154539 B2 JPH0154539 B2 JP H0154539B2 JP 21434785 A JP21434785 A JP 21434785A JP 21434785 A JP21434785 A JP 21434785A JP H0154539 B2 JPH0154539 B2 JP H0154539B2
- Authority
- JP
- Japan
- Prior art keywords
- piston
- skirt
- pin boss
- top wall
- rib
- 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
- 239000003921 oil Substances 0.000 description 5
- FNYLWPVRPXGIIP-UHFFFAOYSA-N Triamterene Chemical compound NC1=NC2=NC(N)=NC(N)=C2N=C1C1=CC=CC=C1 FNYLWPVRPXGIIP-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000013585 weight reducing agent 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
- F02F3/02—Pistons having means for accommodating or controlling heat expansion
- F02F3/027—Pistons having means for accommodating or controlling heat expansion the skirt wall having cavities
Landscapes
- Engineering & Computer Science (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】
Ａ 発明の目的
(1) 産業上の利用分野
本発明は、エンジンに用いられるピストン、特
に、外周にリング溝を有するヘツド部と、このヘ
ツド部の下面に一体に突設されてピストン軸線を
挟んで同軸上に並ぶ一対のピンボス部と、ヘツド
部の下部周縁に一体に連なるスカート部とからな
り、スカート部のピンボス部との隣接部に切欠を
設け、この切欠の底面に沿つて延びるリブにより
ピンボス部及びスカート部間を一体に連結したピ
ストンの改良に関する。Detailed Description of the Invention A. Object of the Invention (1) Industrial Field of Application The present invention relates to a piston used in an engine, particularly a head portion having a ring groove on the outer periphery, and a piston integrally protruding from the lower surface of the head portion. It consists of a pair of pin boss parts arranged coaxially across the piston axis, and a skirt part that is integrally continuous with the lower periphery of the head part.A notch is provided in the skirt part adjacent to the pin boss part, and this notch is The present invention relates to an improvement in a piston in which a pin boss part and a skirt part are integrally connected by a rib extending along the bottom surface.
(2) 従来の技術
かかるピストンは、例えば実開昭60−26254号
公報に開示されているように、既に知られてい
る。(2) Prior Art Such a piston is already known, for example, as disclosed in Japanese Utility Model Application Publication No. 60-26254.
(3) 発明が解決しようとする問題点
従来のピストンにおいて、ピンボス部及びスカ
ート部間に連結するリブは、該ピストンがシリン
ダ内を往復動するとき、シリンダ内壁からスカー
ト部に加わるスラスト荷重をピンボス部に伝達支
承させてスカート部の変形を極力防止すること、
即ちスカート部の剛性強化に役立つものである
が、ヘツド部の頂壁の強化には寄与していない。(3) Problems to be solved by the invention In conventional pistons, the ribs connected between the pin boss and the skirt transfer the thrust load applied from the inner wall of the cylinder to the skirt when the piston reciprocates within the cylinder. To prevent deformation of the skirt portion as much as possible by providing transmission support to the skirt portion.
That is, although it is useful for strengthening the rigidity of the skirt section, it does not contribute to strengthening the top wall of the head section.
本発明は、前記リブを利用してヘツド部の頂壁
を補強し得るようにして、該頂壁の薄肉化を可能
にし、もつて高強度で軽量なピストンを提供する
ことを目的とする。 An object of the present invention is to provide a high-strength, lightweight piston that allows the top wall of the head portion to be reinforced using the ribs, thereby making it possible to reduce the thickness of the top wall.
Ｂ 発明の構成
(1) 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、本発明は、ピンボ
ス部及びスカート部間を連結するリブをヘツド部
に向つて軸線に近づけるように該軸線に対して傾
斜させると共に、このリブの上端をヘツド部の頂
壁の略中心部に連結するように延長させたことを
特徴とする。B. Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides a structure in which the rib connecting the pin boss portion and the skirt portion is moved closer to the axis line toward the head portion. The upper end of the rib is extended so as to be connected to approximately the center of the top wall of the head portion.
(2) 作用
ピストンがエンジンのシリンダ内を往復動する
とき、シリンダ内で起こるガスの燃焼圧力はヘツ
ド部の頂壁から、その中心部に集まる前記リブを
介してピンボス部に伝達支承されるので、ヘツド
部の頂壁の変形を極力防止することができる。(2) Effect When the piston reciprocates within the cylinder of the engine, the combustion pressure of the gas generated within the cylinder is transmitted and supported from the top wall of the head section to the pin boss section via the ribs gathered at its center. , deformation of the top wall of the head portion can be prevented as much as possible.
(3) 実施例
以下、図面により本発明の一実施例について説
明すると、第１図において、エンジン用ピストン
１はアルミニウム合金製であつて、ヘツド部２
と、このヘツド部２の下面に一体に突設されてピ
ストン軸線Ｙを挟んで同軸上に並ぶ一対のピンボ
ス部３，３と、ヘツド部２の下部周縁に一体に連
なるスカート部４とからなつており、ピンボス部
３，３にはピストンピン（図示せず）を支持する
ためのピン孔５，５が穿設されている。(3) Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, an engine piston 1 is made of an aluminum alloy, and a head portion 2
It consists of a pair of pin boss parts 3, 3 which are integrally protruded from the lower surface of the head part 2 and arranged coaxially across the piston axis Y, and a skirt part 4 which is integrally continuous with the lower peripheral edge of the head part 2. The pin boss portions 3, 3 are provided with pin holes 5, 5 for supporting a piston pin (not shown).
スカート部４は、その外径が下方に向つて僅か
１増加するようにテーパが付されており、エンジ
ンの高温時には、スカート４の上下両端間の温度
差によるも円柱形状を呈するようになつている。 The skirt portion 4 is tapered so that its outer diameter slightly increases by 1 toward the bottom, and when the engine is at a high temperature, it assumes a cylindrical shape due to the temperature difference between the upper and lower ends of the skirt 4. There is.
またスカート部４は、第２図に示すように、横
断面がピンボス３，３の軸線方向に短径ａを向け
た楕円となるように形成されており（即ちａ＜
ｂ）、エンジンの高温時には、比較的厚肉のピン
ボス３，３の存在によるも真円の断面形状を呈す
るようになつている。 Further, as shown in FIG. 2, the skirt portion 4 is formed so that its cross section is an ellipse with the minor axis a directed in the axial direction of the pin bosses 3, 3 (that is, a<
b) When the engine is at a high temperature, the relatively thick pin bosses 3, 3 provide a perfectly circular cross-sectional shape.
第５図において、ヘツド部２は、頂壁６と、こ
の頂壁６の周縁に一体に連なる、スカート部４よ
りも厚肉の円筒状のリングベルト７とからなつて
おり、リングベルト７の外周には上から順に第
１、第２、第３リング溝８1，８2，８3が刻設さ
れ、第１、第２リング溝８1，８2には圧縮リング
が、第３リング溝８3にはオイルリング（いずれ
も図示せず）が装着されるようになつている。 In FIG. 5, the head portion 2 consists of a top wall 6 and a cylindrical ring belt 7 that is thicker than the skirt portion 4 and integrally continuous with the periphery of the top wall 6. First, second, and third ring grooves 8 1 , 8 2 , and 8 3 are carved on the outer periphery in order from the top. An oil ring (none of which is shown) is attached to the groove 83 .
第１図、第３図ないし第５図に示すように、ス
カート部４において、その周方向で各ピンボス部
３の両側に隣接する部分には切欠９，９が設けら
れ、これら切欠９，９の底面９ａ，９ａは、スカ
ート部４のスラスト荷重受面４ａがエンジンのシ
リンダ内壁からスラスト荷重を受けたとき想定さ
れる等圧線Ｌに沿わせるべく、上方に向つてピス
トン軸線Ｙに近づくように傾斜させてある。 As shown in FIGS. 1, 3 to 5, notches 9, 9 are provided in the skirt portion 4 at portions adjacent to both sides of each pin boss portion 3 in the circumferential direction. The bottom surfaces 9a, 9a of the skirt portion 4 are inclined upward toward the piston axis Y so that the thrust load receiving surface 4a of the skirt portion 4 follows an isobar line L that is assumed when receiving a thrust load from the inner wall of the cylinder of the engine. I've let it happen.
ピンボス部３とスカート部４とは、上記切欠９
の底面９ａに沿つて延びるリブ１０によつて一体
に連結される。更にこのリブ１０は、上端がヘツ
ド部２の頂壁６の略中心部に一体に連結するよう
に上方へ延長される。このリブ１０には切欠９内
をスカート部４内に連通する透孔１１が穿設され
る。 The pin boss portion 3 and the skirt portion 4 are connected to the notch 9 described above.
are integrally connected by a rib 10 extending along the bottom surface 9a. Furthermore, the rib 10 extends upward so that its upper end is integrally connected to the substantially central portion of the top wall 6 of the head portion 2. This rib 10 is provided with a through hole 11 that communicates the inside of the notch 9 with the inside of the skirt portion 4 .
また、上記切欠９に臨むリングベルト７の下面
には凹部１２が設けられ、この凹部１２はリング
溝８1〜８3の裏側に達する深さに形成される。
尚、この凹部１２は前記切欠９と共に鋳抜きによ
り形成される。 Further, a recess 12 is provided on the lower surface of the ring belt 7 facing the notch 9, and this recess 12 is formed to a depth that reaches the back side of the ring grooves 8 1 to 8 3 .
Incidentally, this recessed portion 12 and the notch 9 are formed by casting.
次にこの実施例の作用を説明する。 Next, the operation of this embodiment will be explained.
ピストン１がエンジンのシリンダ内を往復動す
るとき、シリンダ内で起こるガスの燃焼圧力はヘ
ツド部２の頂壁６から、該頂壁６の中心部に集ま
る４枚のリブ１０，１０…を介して一対のピンボ
ス部３，３に伝達支承されるので、頂壁６の変形
を極力防止することができる。このように頂壁６
は、リブ１０，１０…により中心部が効果的に補
強されるので、その薄肉化が可能となる。 When the piston 1 reciprocates within the cylinder of the engine, the combustion pressure of the gas generated within the cylinder is transmitted from the top wall 6 of the head portion 2 through four ribs 10, 10, etc. that gather at the center of the top wall 6. Since the top wall 6 is transmitted and supported by the pair of pin boss parts 3, 3, deformation of the top wall 6 can be prevented as much as possible. In this way, the top wall 6
Since the center portion is effectively reinforced by the ribs 10, 10, . . . , it is possible to make the wall thinner.
ピストン１が往復運動中、ピン孔５，５に嵌装
されるピストンピンを軸として例えば第１図で反
時計方向に首振りを行うと、スカート部４の右側
のスラスト荷重受面４ａにシリンダの内壁からの
スラスト荷重が加わり、その荷重はスカート部４
の下端で最も大きく、上方及び周方向へ向かうに
従い減少するので、第３図に示すように、想定さ
れる等圧線Ｌは山形の放物線に似た曲線を描くこ
とになる。 During reciprocating motion, when the piston 1 swings counterclockwise about the piston pins fitted in the pin holes 5, 5, as shown in FIG. A thrust load is applied from the inner wall of the skirt portion 4, and the load is applied to the skirt portion 4.
It is largest at the lower end and decreases upward and toward the circumferential direction, so the assumed isobars L will draw a curve resembling a chevron-shaped parabola, as shown in FIG.
ところで、各ピンボス３の両側でスカート部４
に設けられた切欠９，９は、それらの底面９ａ，
９ａが等圧線Ｌに沿うように、ピストン軸線Ｙに
対し傾斜して形成されているので、スカート部４
のスラスト荷重受面４ａに充分な有効面積を与え
つつ、切欠９，９を最大限に拡張してピストン１
の効果的な軽量化を図ることができる。 By the way, the skirt portions 4 are attached on both sides of each pin boss 3.
The notches 9, 9 provided in the bottom surfaces 9a,
Since the skirt portion 9a is formed to be inclined with respect to the piston axis Y along the isobar line L, the skirt portion 4
While giving sufficient effective area to the thrust load receiving surface 4a of the piston 1, the notches 9 are expanded to the maximum extent.
Effective weight reduction can be achieved.
しかも、スカート部４に加わる前記スラスト荷
重は、切欠９，９の底面９ａ，９ａに位置するリ
ブ１０，１０を介してピンボス部３に伝達支承さ
れるため、切欠９，９の存在にも拘わずスカート
部４の変形を極力防止することができる。 Moreover, since the thrust load applied to the skirt portion 4 is transmitted and supported to the pin boss portion 3 via the ribs 10, 10 located on the bottom surfaces 9a, 9a of the notches 9, 9, the existence of the notches 9, 9 does not matter. Deformation of the skirt portion 4 can be prevented as much as possible.
一方、スラスト荷重受面９ａとシリンダ内壁と
の間に介在する潤滑油は、スラスト荷重が大きく
作用する所から小さく作用する所へ、等圧線Ｌと
直交する方向へ押しやられて切欠９，９へ速やか
に排除され、そしてその油の一部はヘツド部２下
面の凹部１２，１２に浸入して、リングベルト７
をリング溝８1〜８3の裏側から効果的に冷却し、
他の一部はピン孔５に浸入してピストンピンを潤
滑し、残る大部分の油はリブ１０の透孔１１を通
つてピストン１の中空部へ排出され、ピストン１
を内側から効果的に冷却する。 On the other hand, the lubricating oil interposed between the thrust load receiving surface 9a and the cylinder inner wall is pushed in a direction perpendicular to the isobars L, from a place where a large thrust load acts to a place where a small thrust load acts, and is quickly transferred to the notches 9, 9. A part of the oil enters the recesses 12, 12 on the lower surface of the head part 2 and is removed from the ring belt 7.
is effectively cooled from the back side of ring grooves 81 to 83 ,
The other part enters the pin hole 5 and lubricates the piston pin, and most of the remaining oil is discharged into the hollow part of the piston 1 through the through hole 11 of the rib 10.
effectively cools it from the inside.
また第３リング溝８3に装着されたオイルリン
グ（図示せず）により、シリンダ内壁から各切欠
９へ直接掻き落された油も、上記と同様の経路を
辿るものである。 Further, oil directly scraped from the cylinder inner wall to each notch 9 by an oil ring (not shown) installed in the third ring groove 8 3 also follows the same path as described above.
Ｃ 発明の効果
以上のように本発明によれば、ピンボス部及び
スカート部間を連結するリブをヘツド部に向つて
軸線に近づけるように該軸線に対して傾斜させる
と共に、このリブの上端をヘツド部の頂壁の略中
心部に連結するように延長させたので、本来スカ
ート部の補強のために設けられるリブを利用する
という極めて簡単な構造により、ヘツド部の頂壁
を効果的に補強することができ、その結果、その
頂壁の薄肉化が可能となり、ピストンの所定の強
度を確保しつつ、その軽量化を達成することがで
きる。C. Effects of the Invention As described above, according to the present invention, the rib connecting the pin boss part and the skirt part is inclined with respect to the axis line so as to approach the axis line toward the head part, and the upper end of this rib is tilted toward the axis line. Since it is extended so as to be connected to approximately the center of the top wall of the head section, the top wall of the head section can be effectively reinforced with an extremely simple structure that utilizes the ribs originally provided to reinforce the skirt section. As a result, the top wall of the piston can be made thinner, and the weight of the piston can be reduced while ensuring a predetermined strength of the piston.
図面は本発明の一実施例を示すもので、第１図
はピストンの正面図、第２図は同平面図、第３図
は同側面図、第４図は第３図の−線断面図、
第５図は第４図の−線断面図である。
Ｙ……ピストン軸線、１……ピストン、２……
ヘツド部、３……ピンボス部、４……スカート
部、６……頂壁、７……リングベルト、８1，８
２，８3……リング溝、９……切欠、９ａ……底
面、１０……リブ、１１……透孔。
The drawings show one embodiment of the present invention, and FIG. 1 is a front view of the piston, FIG. 2 is a plan view of the same, FIG. 3 is a side view of the piston, and FIG. 4 is a sectional view taken along the line -- of FIG. ,
FIG. 5 is a sectional view taken along the line -- in FIG. 4. Y... Piston axis, 1... Piston, 2...
Head part, 3... Pin boss part, 4... Skirt part, 6... Top wall, 7... Ring belt, 8 1 , 8
2 , 8 3 ...Ring groove, 9...Notch, 9a...Bottom surface, 10...Rib, 11...Through hole.
Claims (1)
ツド部の下面に一体に突設されてピストン軸線を
挟んで同軸上に並ぶ一対のピンボス部と、ヘツド
部の下部周縁に一体に連なるスカート部とからな
り、スカート部のピンボス部との隣接部に切欠を
設け、この切欠の底面に沿つて延びるリブにより
ピンボス部及びスカート部間を一体に連結したピ
ストンにおいて、前記リブをヘツド部に向つて軸
線に近づけるように該軸線に対して傾斜させると
共に、このリブの上端をヘツド部の頂壁の略中心
部に連結するように延長させたことを特徴とする
ピストン。1. A head portion having a ring groove on the outer periphery, a pair of pin boss portions integrally protruding from the lower surface of the head portion and aligned coaxially across the piston axis, and a skirt portion integrally extending along the lower periphery of the head portion. In this piston, a notch is provided in the skirt part adjacent to the pin boss part, and the pin boss part and the skirt part are integrally connected by a rib extending along the bottom surface of the notch. A piston characterized in that the rib is inclined with respect to the axis so as to approach the piston, and the upper end of the rib is extended so as to be connected to approximately the center of the top wall of the head portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21434785A JPS6285153A (en) | 1985-09-27 | 1985-09-27 | Piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21434785A JPS6285153A (en) | 1985-09-27 | 1985-09-27 | Piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6285153A JPS6285153A (en) | 1987-04-18 |
| JPH0154539B2 true JPH0154539B2 (en) | 1989-11-20 |
Family
ID=16654259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21434785A Granted JPS6285153A (en) | 1985-09-27 | 1985-09-27 | Piston |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6285153A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007020447A1 (en) * | 2007-04-27 | 2008-10-30 | Mahle International Gmbh | Piston for an internal combustion engine |
| DE102012203570A1 (en) * | 2012-03-07 | 2013-09-12 | Mahle International Gmbh | Cast light metal piston, especially an aluminum piston |
| JP6242693B2 (en) * | 2014-01-16 | 2017-12-06 | 日立オートモティブシステムズ株式会社 | Piston of internal combustion engine |
-
1985
- 1985-09-27 JP JP21434785A patent/JPS6285153A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6285153A (en) | 1987-04-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |