JPH0563627B2 - - Google Patents
Info
- Publication number
- JPH0563627B2 JPH0563627B2 JP2580885A JP2580885A JPH0563627B2 JP H0563627 B2 JPH0563627 B2 JP H0563627B2 JP 2580885 A JP2580885 A JP 2580885A JP 2580885 A JP2580885 A JP 2580885A JP H0563627 B2 JPH0563627 B2 JP H0563627B2
- Authority
- JP
- Japan
- Prior art keywords
- piston
- intake
- cylinder
- cylinder hole
- cross
- 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 - Fee Related
Links
- 238000002485 combustion reaction Methods 0.000 claims description 20
- 238000003754 machining Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/18—Other cylinders
- F02F1/183—Oval or square cylinders
-
- 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
- F02B1/00—Engines characterised by fuel-air mixture compression
- F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
- F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
-
- 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
- F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
-
- 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
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/18—DOHC [Double overhead camshaft]
-
- 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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F2001/244—Arrangement of valve stems in cylinder heads
- F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は４サイクル内燃機関に関し、特にシリ
ンダ孔の横断面形状を非円形状にした４サイクル
内燃機関に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a four-stroke internal combustion engine, and particularly to a four-stroke internal combustion engine in which the cross-sectional shape of the cylinder hole is non-circular.
シリンダ孔を横断面非円形状に形成した従来の
４サイクル内燃機関として、例えば実開昭54−
152802号公報には第１図イに示すようにシリンダ
孔Ｈを長円形状に形成したもの、また特開昭59−
153952号公報には第２図に示すように、シリンダ
孔Ｈを短半径r1の円弧S1と長半径r2の円弧S2とを
連続させつなげた複合円形状に形成したものが、
それぞれ記載されている。
As a conventional four-stroke internal combustion engine in which the cylinder hole is formed with a non-circular cross section, for example,
No. 152802 has a cylinder hole H formed in an oval shape as shown in Figure 1A, and Japanese Patent Application Laid-Open No.
153952, as shown in Fig. 2, the cylinder hole H is formed into a compound circular shape in which an arc S 1 with a minor radius r 1 and an arc S 2 with a major radius r 2 are continuously connected.
Each is listed.
ところで、このような形状のシリンダ孔Ｈを有
するエンジンにあつては、いずれも次のような欠
点を有している。すなわち、双方のエンジンにあ
つては、第１図ロおよび第２図ロにそれぞれ示す
ように、シリンダ孔Ｈの外形線に曲率変化が連続
しない個所P1、P2を有しており、この個所を加
工する際カツターの動きに無理が生じ、(a)高精度
を出すことができない、(b)加工に時間がかかる、
(c)カツターの早期摩耗を来たす等の不具合が生じ
ることから、量産体制がとりずらいという欠点を
有していた。 Incidentally, all engines having cylinder holes H having such a shape have the following drawbacks. That is, in both engines, as shown in Fig. 1B and Fig. 2B, respectively, the outline of the cylinder hole H has points P 1 and P 2 where the curvature change is not continuous; When machining a part, the movement of the cutter becomes unreasonable, and (a) high precision cannot be achieved; (b) machining takes time.
(c) Since problems such as early wear of the cutter occur, it has the disadvantage that it is difficult to set up a mass production system.
そこで、本発明者等は、上記欠点を除去した内
燃機関として、第３図イに示すように、シリンダ
孔Ｈを正規楕円状に形成したものを考えた。しか
しながら、この内燃機関にあつては、第３図ロに
示すようにシリンダ孔Ｈの外形線の曲率変化がす
べて連続しているため、加工性が良いという利点
を有する反面、長軸方向の先端部分が先細りとな
り、そこにバルブを収めることができないデツド
スペースＤが生じたり、ピストンリングの曲率が
小さくなりすぎて組付性が悪くなつたりするとい
う新たな不具合が生じることがわかつた。 Therefore, the present inventors devised an internal combustion engine in which the cylinder hole H is formed in a regular elliptical shape, as shown in FIG. 3A, as an internal combustion engine that eliminates the above drawbacks. However, in this internal combustion engine, as shown in Fig. 3B, the curvature change of the outer line of the cylinder hole H is all continuous, so while it has the advantage of good workability, the tip of the longitudinal axis It has been found that new problems arise, such as the tapered section, creating a dead space D in which the valve cannot be accommodated, and the piston ring's curvature becoming too small, making it difficult to assemble.
本発明は上記事情に鑑みてなされたもので、加
工性に優れかつデツトスペースを生じさせること
がなく、さらにピストンリングの組付も良好に行
なうことができるシリンダおよびピストンを備え
た４サイクル内燃機関を提供することを目的とす
る。 The present invention has been made in view of the above circumstances, and provides a four-stroke internal combustion engine equipped with a cylinder and a piston that have excellent workability, do not create dead spaces, and can also be easily assembled with piston rings. The purpose is to provide.
かかる目的を達成するために、本発明では曲率
変化が連続する基長円を基準曲線とし、その基準
曲線の各点から法線方向に一定距離だけ隔てた点
を結ぶことにより形成される曲線を、横断面外周
形状とするピストンと、該ピストンを摺動自在に
嵌合するシリンダ孔を有するシリンダブロツク
と、該シリンダブロツク上に重合して前記ピスト
ンとの間に燃焼室を画成し、かつ該燃焼室の横断
面長軸方向に延びる複数列の吸・排気口を有する
シリンダヘツドと、該シリンダヘツド内に配設さ
れて前記吸・排気口を開閉する吸・排気バルブと
を備えた構成としている。
In order to achieve such an object, the present invention uses a base ellipse with continuous curvature changes as a reference curve, and a curve formed by connecting points separated by a certain distance in the normal direction from each point of the reference curve. , a piston having an outer peripheral shape in cross section, a cylinder block having a cylinder hole into which the piston is slidably fitted, overlapping the cylinder block to define a combustion chamber between the piston and the piston; A cylinder head having a plurality of rows of intake and exhaust ports extending in the longitudinal direction of the cross section of the combustion chamber, and an intake and exhaust valve disposed within the cylinder head to open and close the intake and exhaust ports. It is said that
以下、本発明の一実施例を図面を参照して説明
する。
Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
第４図は本発明に係る４サイクル内燃機関の要
部縦断面図であり、図において符号１はシリンダ
ヘツド、２はシリンダブロツク、３はシリンダブ
ロツク２のシリンダ孔４に摺動自在に嵌装された
ピストン、５は気化器、６はシリンダヘツド１下
面とシリンダ孔４とピストン３上面によつて画成
される燃焼室、７は気化器５にコンチユーブ８を
介して連通されかつ燃焼室６に開口する吸気通
路、９は燃焼室６に開口し、かつ図示しない排気
管に連通する排気通路であり、吸気通路７および
排気通路９にはそれぞれそれらを開閉する吸気バ
ルブ１０、排気バルブ１１が配設されている。 FIG. 4 is a longitudinal cross-sectional view of a main part of a four-stroke internal combustion engine according to the present invention, in which reference numeral 1 is a cylinder head, 2 is a cylinder block, and 3 is a cylinder block 2 that is slidably fitted into a cylinder hole 4. 5 is a carburetor; 6 is a combustion chamber defined by the lower surface of the cylinder head 1, the cylinder hole 4, and the upper surface of the piston 3; 7 is connected to the carburetor 5 via a contube 8; An intake passage 9 opens into the combustion chamber 6 and is an exhaust passage which communicates with an exhaust pipe (not shown).The intake passage 7 and the exhaust passage 9 each have an intake valve 10 and an exhaust valve 11 for opening and closing them. It is arranged.
前記ピストン３の横断面形状は、第７図に示す
ように曲率変化が連続する基長円（ここでは正規
楕円とされている）Ｘを基準曲線とし、その基準
曲線の各点から法線方向に一定距離ｒだけ隔てた
点を結ぶことにより形成される曲線（ここでは、
これを正規楕円包絡円と定義する）とされてい
る。また、シリンダ孔４の横断面内周形状も、勿
論ピストン３のそれより若干大きい正規楕円包絡
円とされている。 The cross-sectional shape of the piston 3 is determined by using a base ellipse (here, a regular ellipse) X with continuous curvature changes as a reference curve, as shown in FIG. 7, and from each point of the reference curve in the normal direction. A curve formed by connecting points separated by a certain distance r (here,
This is defined as the regular elliptic envelope). Further, the cross-sectional inner circumferential shape of the cylinder hole 4 is of course a regular elliptic envelope slightly larger than that of the piston 3.
前記吸気通路７および排気通路９の燃焼室６側
開口はそれぞれ２つに分岐され、それは第５図に
示すように燃焼室６の長軸ｌの両側にそれぞれ互
いに対応するよう、４個ずつ並んで設けられてい
る。また同図中１２は燃焼室６の長手方向に沿つ
て２個設けられた点火プラグである。さらに、こ
の例で示すピストン３は、第６図に示すようにピ
ストン３内にピストンピン１３がピストンの長手
方向に沿つて配され、このピストンピン１３に所
定間隔をあけて２本のコンロツド１４，１４が連
結されることにより、クランクシヤフト（図示せ
ず）に連結されている。なお、第６図中１５，１
６はピストンリング、１７はオイルリングを示し
ている。 The openings on the combustion chamber 6 side of the intake passage 7 and the exhaust passage 9 are each branched into two, and four of them are lined up in parallel on both sides of the long axis l of the combustion chamber 6, as shown in FIG. It is set in. In addition, reference numeral 12 in the figure indicates two spark plugs provided along the longitudinal direction of the combustion chamber 6. Furthermore, in the piston 3 shown in this example, a piston pin 13 is disposed inside the piston 3 along the longitudinal direction of the piston, as shown in FIG. , 14 are connected to a crankshaft (not shown). In addition, 15,1 in Figure 6
6 indicates a piston ring, and 17 indicates an oil ring.
しかして、上記構成の４サイクル内燃機関によ
れば、シリンダ孔４およびピストン３の横断面形
状を、曲率変化が連続する基長円Ｘを基準曲線と
し、その基準曲線の包絡円によつて描かれる形状
としているから、それらシリンダ孔４やピストン
３を加工するに際し、カツターを急激に移動させ
ることなく、なめらかなカツター移動により加工
し得る。この結果、加工がなめらかとなり、高精
度加工、加工時間の短縮並びにカツターの長寿命
化を図ることができる。 According to the four-stroke internal combustion engine configured as described above, the cross-sectional shapes of the cylinder hole 4 and the piston 3 can be drawn by using the base ellipse X in which the curvature changes are continuous as a reference curve, and by the envelope circle of the reference curve. Since the cylinder hole 4 and the piston 3 can be machined, the cutter can be smoothly moved without abruptly moving the cutter. As a result, machining becomes smooth, allowing for high precision machining, shortened machining time, and longer life of the cutter.
加えて、基長円Ｘを正規楕円とする場合には、
シリンダ孔４を加工するに際し、カツターの回転
中心を正規楕円に沿つて動かせばよく、NCマシ
ン等を用いることによつて、極めて容易に加工す
ることができる。 In addition, when the base ellipse X is a regular ellipse,
When machining the cylinder hole 4, it is sufficient to move the rotation center of the cutter along a regular ellipse, and machining can be performed extremely easily by using an NC machine or the like.
また、シリンダ孔４およびピストン３の横断面
形状の曲率変化が連続しているため、ピストン３
嵌装時においてシリンダ孔４とピストン３双方
に、熱膨張、外力、製作上の寸法バラツキ等に起
因する極所的な変形や応力集中が生じにくい利点
もある。 In addition, since the curvature changes of the cross-sectional shapes of the cylinder hole 4 and the piston 3 are continuous, the piston 3
There is also an advantage that local deformation and stress concentration due to thermal expansion, external force, manufacturing dimensional variations, etc. are less likely to occur in both the cylinder hole 4 and the piston 3 during fitting.
さらに、第３図イに示す正規楕円形のシリンダ
あるいはピストンに比べて、長軸方向先端部分の
内側を広く採ることができ、その部分にテツドス
ペースが生じ難く、吸・排気口を外周近傍にまで
接近させて多数配することができ、出力の向上が
図れる。また、ピストン１５，１６においても、
各部分の曲率を比較的大きくとることができ、従
来のものに比べてそれらの組付性が向上する。 Furthermore, compared to the regular elliptical cylinder or piston shown in Figure 3A, the inside of the tip in the long axis direction can be made wider, making it difficult to create a tread space in that area, and the intake and exhaust ports can be placed near the outer periphery. It is possible to arrange a large number of them close to each other, thereby improving the output. Also, in the pistons 15 and 16,
The curvature of each part can be made relatively large, and the ease of assembling them is improved compared to conventional ones.
第８図および第９図は、ピストン３およびシリ
ンダ孔４の横断面形状を正規楕円包絡円とした場
合の寸法特性を示し、第８図、第９図ともに、
吸・排気口ｈの直径を18mmとし、包絡円の半径ｒ
を20mmとし、さらに面積を一定とした条件下にお
ける寸法特性を示している。 8 and 9 show the dimensional characteristics when the cross-sectional shapes of the piston 3 and the cylinder hole 4 are regular elliptical envelope circles, and both FIGS.
The diameter of the intake/exhaust port h is 18 mm, and the radius of the envelope circle is r
The figure shows the dimensional characteristics under the condition that the area is 20 mm and the area is constant.
第８図は横軸に、正規楕円包絡円の長径Ａと同
短径Ｂとの比Ａ／Ｂをとり、縦軸に、吸・排気口
を正規楕円長軸方向両側に配置させたときの両
吸・排気口ｈの中心間距離Ｌをとつている（第７
図参照）。正規楕円包絡円内に直径18mmの吸・排
気口Ｈを長軸方向に沿つて４個設ける場合を仮定
すると、前記中心間距離Ｌを少なくとも54mm以上
とらなければならず、その場合図から明らかなよ
うにＡ／Ｂは1.6以上となる。 In Figure 8, the horizontal axis shows the ratio A/B between the major axis A and the short axis B of the regular ellipse envelope circle, and the vertical axis shows the ratio A/B of the regular ellipse envelope when the intake and exhaust ports are arranged on both sides in the long axis direction of the regular ellipse. The distance L between the centers of both intake and exhaust ports h is taken (7th
(see figure). Assuming that four intake/exhaust ports H with a diameter of 18 mm are provided along the long axis direction within the envelope of a regular ellipse, the distance L between the centers must be at least 54 mm, and in that case, it is clear from the figure. Thus, A/B is 1.6 or more.
また、第９図は横軸に正規楕円包絡円長径Ａと
同短径Ｂとの比Ａ／Ｂをとり、縦軸に基準曲線で
ある正規楕円Ｘの長径ａと同短径ｂとの比ａ／ｂ
をとつている。この図から明らかなようにａ／ｂ
をいかなる値にとつても、Ａ／Ｂは23を越えるこ
とはない。 In addition, in Figure 9, the horizontal axis shows the ratio A/B between the major axis A and the minor axis B of the regular ellipse, and the vertical axis shows the ratio between the major axis a and the minor axis b of the regular ellipse, which is the reference curve. a/b
I'm taking it. As is clear from this figure, a/b
For any value of , A/B will never exceed 23.
以上のことから、ピストン３およびシリンダ孔
４の横断面形状を正規楕円包絡円とし、吸・排気
口の直径を18mmとするとともにそれらを４個ずつ
長手方向に沿つて設け、包絡円の半径ｒを20mmと
し、さらにピストンおよびシリンダ孔４の横面積
を一定とした場合には、Ａ／Ｂは以下の範囲内と
なる。 From the above, the cross-sectional shape of the piston 3 and the cylinder hole 4 is a regular elliptical envelope circle, the diameter of the intake and exhaust ports is 18 mm, and four of them are provided along the longitudinal direction, and the radius of the envelope circle is r. is 20 mm, and furthermore, when the lateral area of the piston and cylinder hole 4 is constant, A/B is within the following range.
1.6≦Ａ／Ｂ≦2.3
言い換えれば、Ａ／Ｂが上記範囲内にない場合
には、上記条件は満たされない。 1.6≦A/B≦2.3 In other words, if A/B is not within the above range, the above condition is not satisfied.
なお、上記実施例においては、シリンダ孔４お
よびピストン３の横断面形状を、正規楕円を基準
曲線とした包絡円としているが、これに限られる
ことなく、第１０図イ，ロに示すようにカテナリ
ー曲線を基準曲線とした包絡円としてもよく、ま
た、サイクロイド曲線を基準曲線とした包絡円で
あつてもよい。 In the above embodiment, the cross-sectional shape of the cylinder hole 4 and the piston 3 is an enveloping circle with a regular ellipse as a reference curve, but the shape is not limited to this, and as shown in FIG. It may be an enveloping circle using a catenary curve as a reference curve, or may be an enveloping circle using a cycloid curve as a reference curve.
本発明によれば、以下のような優れた効果を奏
する。
According to the present invention, the following excellent effects are achieved.
(a) シリンダ孔あるいはピストンを加工する際、
加工対象物の曲率変化が連続しているため、カ
ツターの移動がなめらかになる。もつて、高精
度の加工が行え、加工時間の短縮が図れ、さら
にカツターの長寿命化を図ることができ、量産
体制に適する。(a) When machining the cylinder hole or piston,
Since the curvature of the workpiece changes continuously, the cutter moves smoothly. As a result, high-precision machining can be performed, machining time can be shortened, and the life of the cutter can be extended, making it suitable for mass production systems.
(b) 横断面正規楕円形のシリンダあるいはピスト
ンに比べて、デツドスペースが生じ難く、その
分吸・排気口を多く配して出力の向上を図るこ
とができる。(b) Compared to a cylinder or piston with a regular elliptical cross section, dead space is less likely to occur, and the output can be improved by providing more intake and exhaust ports.
(c) ピストンリングやオイルリングにおいて、曲
率の小さすぎる個所が生じるおそれがなく、そ
の分それらの組付性が向上する。(c) There is no risk of parts having too small a curvature in the piston ring or oil ring, and the ease of assembling them is improved accordingly.
第１図イ，ロは従来のシリンダ孔の一例を示
し、イは横断面図、ロはその曲率変化図、第２図
イ，ロは従来のシリンダ孔の他の例を示し、イは
横断面図、ロはその曲率変化図、第３図イ，ロは
従来のシリンダ孔のさらに他の例を示し、イは横
断面図、ロはその曲率変化図、第４図ないし第７
図イ，ロは本発明の一実施例を示し、第４図は要
部の縦断面図、第５図はシリンダヘツドの底面
図、第６図は第４図の−線に沿う断面図、第
７図イはピストンの横断面図、第７図ロはその曲
率変化図、第８図および第９図はシリンダ孔ある
いはピストンの形状特性図、第１０図イは本発明
の他の実施例を示す横断面図、第１０図ロはその
曲率変化図である。
１……シリンダヘツド、２……シリンダブロツ
ク、３……ピストン、４……シリンダ孔、６……
燃焼室、７……吸気通路、９……排気通路、１０
……吸気バルブ、１１……排気バルブ、１５，１
６……ピストンリング。
Figure 1 A and B show an example of a conventional cylinder hole, A is a cross-sectional view, and B is a diagram of its curvature change. 3 shows still another example of a conventional cylinder hole, A is a cross-sectional view, B is a curvature change diagram thereof, and FIGS. 4 to 7
Figures A and B show an embodiment of the present invention, Figure 4 is a longitudinal sectional view of the main part, Figure 5 is a bottom view of the cylinder head, Figure 6 is a sectional view taken along the - line in Figure 4, Figure 7A is a cross-sectional view of the piston, Figure 7B is a diagram of its curvature change, Figures 8 and 9 are shape characteristics diagrams of the cylinder hole or piston, and Figure 10A is another embodiment of the present invention. FIG. 10(b) is a cross-sectional view showing the curvature change. 1... Cylinder head, 2... Cylinder block, 3... Piston, 4... Cylinder hole, 6...
Combustion chamber, 7...Intake passage, 9...Exhaust passage, 10
...Intake valve, 11 ...Exhaust valve, 15,1
6...Piston ring.
Claims (1)
その基準曲線の各点から法線方向に一定距離だけ
隔てた点を結ぶことにより形成される曲線を、横
断面外周形状とするピストンと、該ピストンを摺
動自在に嵌合するシリンダ孔を有するシリンダブ
ロツクと、該シリンダブロツク上に重合して前記
ピストンとの間に燃焼室を画成し、かつ該燃焼室
の横断面長軸方向へ延びる複数列の吸・排気口を
有するシリンダヘツドと、該シリンダヘツド内に
配設されて前記吸・排気口を開閉する吸・排気バ
ルブとを備えてなる４サイクル内燃機関。1 The base ellipse with continuous curvature changes is used as the reference curve,
It has a piston whose cross-sectional outer circumferential shape is a curve formed by connecting points separated by a certain distance in the normal direction from each point of the reference curve, and a cylinder hole into which the piston is slidably fitted. a cylinder block, and a cylinder head that overlaps the cylinder block to define a combustion chamber between the cylinder block and the piston, and has a plurality of rows of intake and exhaust ports extending in the longitudinal direction of the cross section of the combustion chamber; A four-stroke internal combustion engine comprising intake and exhaust valves disposed within the cylinder head to open and close the intake and exhaust ports.
Priority Applications (16)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2580885A JPS61185654A (en) | 1985-02-13 | 1985-02-13 | 4-stroke internal combustion engine |
| ES551333A ES8704585A1 (en) | 1985-01-29 | 1986-01-28 | Four stroke internal combustion engine |
| CA000500466A CA1324297C (en) | 1985-01-29 | 1986-01-28 | Four stroke internal combustion engine |
| AU52747/86A AU584386B2 (en) | 1985-01-29 | 1986-01-28 | Four stroke internal combustion engine |
| US06/823,337 US4671228A (en) | 1985-01-29 | 1986-01-28 | Four stroke internal combustion engine |
| SE8600375A SE464099B (en) | 1985-01-29 | 1986-01-28 | COMBUSTION ENGINE INCLUDING CYLINDER WITH OVAL SECTION |
| IT47592/86A IT1190459B (en) | 1985-01-29 | 1986-01-29 | INTERNAL COMBUSTION ENGINE WITH OVAL SECTION CYLINDERS |
| CN86101292.5A CN1003880B (en) | 1985-01-29 | 1986-01-29 | four-stroke internal combustion engine |
| FR868601229A FR2577619B1 (en) | 1985-01-29 | 1986-01-29 | INTERNAL COMBUSTION ENGINE WITH SYMMETRIC OVAL CROSS-SECTION CYLINDERS |
| GB8805393A GB2199896B (en) | 1985-01-29 | 1986-01-29 | Internal combustion engine |
| GB8602193A GB2170860B (en) | 1985-01-29 | 1986-01-29 | Internal combustion engine |
| DE3644994A DE3644994C2 (en) | 1985-01-29 | 1986-01-29 | |
| DE19863602660 DE3602660A1 (en) | 1985-01-29 | 1986-01-29 | INTERNAL COMBUSTION ENGINE |
| GB8805392A GB2199922B (en) | 1985-01-29 | 1986-01-29 | Internal combustion engine |
| US07/183,445 US4951621A (en) | 1985-01-29 | 1988-04-13 | Four stroke internal combustion engine |
| AU28637/89A AU600615B2 (en) | 1985-01-29 | 1989-01-19 | Four stroke internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2580885A JPS61185654A (en) | 1985-02-13 | 1985-02-13 | 4-stroke internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61185654A JPS61185654A (en) | 1986-08-19 |
| JPH0563627B2 true JPH0563627B2 (en) | 1993-09-10 |
Family
ID=12176166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2580885A Granted JPS61185654A (en) | 1985-01-29 | 1985-02-13 | 4-stroke internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61185654A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITVA20130022A1 (en) * | 2013-04-26 | 2014-10-27 | Remigio Benelli | LONGER PERFORMED PISTONS OF THE CIRCULAR PISTON, FOR ALTERNATIVE MOTORS AND OTHER APPLICATIONS |
-
1985
- 1985-02-13 JP JP2580885A patent/JPS61185654A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61185654A (en) | 1986-08-19 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |