JPH0262686B2 - - Google Patents
Info
- Publication number
- JPH0262686B2 JPH0262686B2 JP59155084A JP15508484A JPH0262686B2 JP H0262686 B2 JPH0262686 B2 JP H0262686B2 JP 59155084 A JP59155084 A JP 59155084A JP 15508484 A JP15508484 A JP 15508484A JP H0262686 B2 JPH0262686 B2 JP H0262686B2
- Authority
- JP
- Japan
- Prior art keywords
- intake
- exhaust
- cylinder
- valve
- hole
- 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 - Lifetime
Links
- 238000002485 combustion reaction Methods 0.000 claims description 16
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005325 percolation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/02—Air cleaners
- F02M35/04—Air cleaners specially arranged with respect to engine, to intake system or specially adapted to vehicle; Mounting thereon ; Combinations with other devices
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)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は吸、排気弁をシリンダの側方に配置す
る側弁式の内燃機関に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a side-valve type internal combustion engine in which intake and exhaust valves are arranged on the sides of a cylinder.
（従来技術及びその問題点）
従来の側弁式内燃機関は、吸気孔及び排気孔が
シリンダの同一側の側面に並べて配置されてい
る。従つて吸気孔に接続する気化器及びエアーク
リーナと、排気孔に接続するマフラーが接近して
しまい、エアークリーナ及びマフラーの容積を充
分に取ることができない。そのためにエアークリ
ーナの耐ダスト性能及びマフラーの消音性能の向
上を図ることは困難であつた。(Prior art and its problems) In a conventional side valve type internal combustion engine, an intake hole and an exhaust hole are arranged side by side on the same side of a cylinder. Therefore, the carburetor and air cleaner connected to the intake hole and the muffler connected to the exhaust hole are close to each other, making it impossible to take up sufficient volume for the air cleaner and muffler. Therefore, it has been difficult to improve the dust resistance performance of the air cleaner and the muffling performance of the muffler.
また従来の側弁式内燃機関では、吸、排気弁は
ピストンの片方の側に配置されているため、燃焼
室がシリンダ中心線方向に見て吸、排気弁側へと
大きく延びる偏平形になると共に、作動ガスの流
れがカウンターフローとなる。そのために圧縮比
の向上が困難になると共にガスの充填効率の向上
も困難になる。 In addition, in conventional side-valve internal combustion engines, the intake and exhaust valves are placed on one side of the piston, so the combustion chamber becomes flat, extending largely toward the intake and exhaust valves when viewed in the direction of the cylinder centerline. At the same time, the flow of working gas becomes a counterflow. This makes it difficult to improve the compression ratio and also makes it difficult to improve the gas filling efficiency.
なお上記のような不具合を解消するために特開
昭59−70838のような内燃機関も考案されている
が、吸、排気弁配置を頭上弁式としているため、
エンジン全高が高くなり、かつコストも高くなる
という不具合がある。 In order to eliminate the above-mentioned problems, an internal combustion engine such as the one in Japanese Patent Application Laid-Open No. 59-70838 was devised, but because the intake and exhaust valves were arranged as overhead valves,
There are problems in that the overall height of the engine becomes higher and the cost also increases.
（問題を解決するための手段）
本発明は上記問題を解決するために、吸、排気
弁配置を側弁式とし、吸気孔をシリンダの一側面
に、排気孔をその反対側の側面に開口し、吸気弁
は吸気孔側に、排気弁は排気孔側に配置し、ピス
トンの外周面形状及びシリンダの内周面形状を、
吸、排気弁を結ぶ方向の径を短径とする長円形状
に形成している。(Means for Solving the Problem) In order to solve the above problem, the present invention adopts a side valve arrangement for the intake and exhaust valves, and opens the intake hole on one side of the cylinder and the exhaust hole on the opposite side. The intake valve is placed on the intake hole side, the exhaust valve is placed on the exhaust hole side, and the outer peripheral surface shape of the piston and the inner peripheral surface shape of the cylinder are
It is formed into an elliptical shape with the short axis being the diameter in the direction connecting the intake and exhaust valves.
（実施例）
第１図は本発明を適用した４サイクル内燃機関
の水平断面図であり、この第１図に置いて、１は
シリンダ、２はクランク軸、３はフライホイール
であつて、フライホイール３はクランク軸２の先
端部に固着され、フライホイール３には冷却フア
ン４が設けられている。シリンダ１及びフアン４
はフアンハウジング５により囲まれている。(Example) Fig. 1 is a horizontal sectional view of a four-stroke internal combustion engine to which the present invention is applied. In Fig. 1, 1 is a cylinder, 2 is a crankshaft, and 3 is a flywheel. The wheel 3 is fixed to the tip of the crankshaft 2, and the flywheel 3 is provided with a cooling fan 4. Cylinder 1 and fan 4
is surrounded by fan housing 5.
シリンダ１に形成される吸、排気孔６，７はク
ランク軸２の軸線に対して左右両側に配置され、
吸気孔６はシリンダ１の一側面、例えば第１図の
左側面に開口し、排気孔７はその反対側の側面
（第１図の右側面）に開口している。吸気孔６に
は気化器８及びエアークリーナ９が接続し、排気
孔７にはマフラー１０が接続している。 The intake and exhaust holes 6 and 7 formed in the cylinder 1 are arranged on both left and right sides with respect to the axis of the crankshaft 2,
The intake hole 6 opens on one side of the cylinder 1, for example, the left side in FIG. 1, and the exhaust hole 7 opens on the opposite side (the right side in FIG. 1). A carburetor 8 and an air cleaner 9 are connected to the intake hole 6, and a muffler 10 is connected to the exhaust hole 7.
吸、排気弁１１，１２はシリンダ１に側弁式に
配置されており、しかも吸気弁１１は吸気孔６側
に、排気弁１２は排気孔側に別れて配置されてい
る。吸、排気弁作動用のカム軸１４は例えばクラ
ンク軸２に対して直角に配置されている。また両
弁１１，１２は例えば下方へ行くに従つてフライ
ホイール３側に来るように少し傾いており、それ
ぞれカム軸１４に連動している。 The intake and exhaust valves 11 and 12 are arranged in the cylinder 1 in a side-valve manner, and the intake valve 11 is arranged separately on the intake hole 6 side, and the exhaust valve 12 is arranged separately on the exhaust hole side. A camshaft 14 for operating intake and exhaust valves is arranged, for example, at right angles to the crankshaft 2. Further, the valves 11 and 12 are slightly inclined toward the flywheel 3 as they go downward, and are linked to the camshaft 14, respectively.
シリンダ１の内周面１ａの形状及びピストン１
５の外周面の形状は、吸、排気弁１１，１２を結
ぶ方向の径を短径とする長円形状に形成されてい
る。いいかえるとクランク軸２の長さ方向に長い
長円形状に形成し、両弁１１，１２間の間隔が広
くなり過ぎないようにしている。即ちシリンダ１
の内周面１ａのクランク軸長さ方向の長さと、両
弁１１，１２間の間隔を概ね備えるようにするこ
とにより、燃焼室の偏平化を防いでいる。 Shape of inner peripheral surface 1a of cylinder 1 and piston 1
The shape of the outer circumferential surface of the valve 5 is an ellipse whose short diameter is the diameter in the direction connecting the intake and exhaust valves 11 and 12. In other words, it is formed into an elongated oval shape in the longitudinal direction of the crankshaft 2 to prevent the gap between the two valves 11 and 12 from becoming too wide. That is, cylinder 1
The length of the inner circumferential surface 1a in the crankshaft length direction and the distance between the valves 11 and 12 are approximately equal to each other, thereby preventing the combustion chamber from becoming flattened.
第２図は第１図の−断面図であり、１６は
クランクケース、１７はシリンダヘツドである。 FIG. 2 is a cross-sectional view taken from FIG. 1, in which 16 is a crankcase and 17 is a cylinder head.
第３図は第１図の−断面略図であり、２０
は点火プラグ、２１は燃焼室である。 FIG. 3 is a schematic cross-sectional view of FIG.
is a spark plug, and 21 is a combustion chamber.
（作用）
エアークリーナ９から吸入される空気は気化器
８、吸気孔６及び吸気弁１１を介して燃焼室２１
に入る。燃焼後の排気ガスは排気弁１２、排気孔
７及びマフラー１０を介して排出される。また作
動ガスはクロスフロー型式で第１図の左から右へ
と流れることになる。(Function) Air taken in from the air cleaner 9 passes through the carburetor 8, the intake hole 6, and the intake valve 11 into the combustion chamber 2.
to go into. Exhaust gas after combustion is exhausted through the exhaust valve 12, the exhaust hole 7, and the muffler 10. Further, the working gas flows from left to right in FIG. 1 in a cross-flow type.
（別の実施例）
(1) カム軸を２本備え、吸気弁用と排気弁用にそ
れぞれ利用するようにしてもよい。その場合の
２本のカム軸はクランク軸と平行に配置する。(Another embodiment) (1) Two camshafts may be provided and used for the intake valve and the exhaust valve, respectively. In that case, the two camshafts are arranged parallel to the crankshaft.
(2) クランク軸を垂直に配置するいわゆるバーチ
カル形の内燃機関に本発明を適用することもで
きる。(2) The present invention can also be applied to a so-called vertical internal combustion engine in which the crankshaft is arranged vertically.
（発明の効果）
(1) 吸気孔と排気孔をシリンダの互いに反対側に
開口しているので、エアークリーナとマフラー
をシリンダの両側に分けて配置することができ
る。従つてエアークリーナとマフラーの容積を
充分に大きく取ることができ、それによりエア
ークリーナの耐ダスト性能を向上させることが
できると共に、エアークリーナ及びマフラーの
消音性能を向上させることもできる。(Effects of the Invention) (1) Since the intake hole and the exhaust hole are opened on opposite sides of the cylinder, the air cleaner and muffler can be placed separately on both sides of the cylinder. Therefore, the volumes of the air cleaner and the muffler can be made sufficiently large, thereby improving the dust resistance performance of the air cleaner and also improving the sound-dampening performance of the air cleaner and the muffler.
(2) 気化器をマフラーから離して配置することが
できるので、気化器に対するマフラーの熱の影
響は殆んどなくなり、パーコレイシヨン等のト
ラブルを未然に防ぐことができる。(2) Since the carburetor can be placed away from the muffler, the effect of heat from the muffler on the carburetor is almost eliminated, making it possible to prevent problems such as percolation.
(3) 吸気弁と排気弁がピストンを挟んで例えば左
右両側に配置されているため、作動ガスの流れ
がクロスフローとなり、従来のようなカウンタ
ーフローの場合に比べて吸気及び排気が円滑に
なり、差動ガスの充填効率も向上する。(3) Because the intake valve and exhaust valve are placed on both sides of the piston, for example, the flow of working gas becomes a cross flow, making intake and exhaust smoother than in the case of a conventional counterflow. , differential gas filling efficiency is also improved.
(4) 吸気弁と排気弁を側弁式に配置しているの
で、頭上弁式のものに比べ、エンジンの全高を
低くすることができ、またコストを低く抑える
こともできる。(4) Since the intake and exhaust valves are arranged in a side valve type, the overall height of the engine can be lowered compared to an overhead valve type, and costs can also be kept low.
(5) 吸気孔と排気孔をピストンの両側に分けてい
るので、例えば冷却フアンによる冷却風を吸気
孔部分用と排気孔部分用とに良好に分配するこ
とができ、従来のように吸気孔と排気孔とをピ
ストンの同一側に配置している場合に比べ、シ
リンダを充分に冷却することができる。(5) Since the intake and exhaust holes are separated on both sides of the piston, cooling air from a cooling fan, for example, can be well distributed between the intake and exhaust holes. The cylinder can be sufficiently cooled compared to the case where the exhaust hole and the exhaust hole are arranged on the same side of the piston.
(6) 吸気弁及び排気弁をピストンの両側に配置す
るようにしているので、従来のように両弁をピ
ストンの片方に配置する場合に比べ、燃焼室が
偏平になる度合は少なくなり、圧縮比の向上を
図ることができる。またそれに加え、シリンダ
の内周面形状及びピストンの外周面形状を、
吸、排気弁を結ぶ方向の径を短径とする長円形
状に形成していることにより、吸、排気弁の間
隔を短くすることができ、それにより燃焼室が
偏平になる度合はより一層少なくなり、圧縮比
をより一層向上させることができる。(6) Since the intake and exhaust valves are placed on both sides of the piston, the degree to which the combustion chamber becomes flattened is reduced compared to the conventional case where both valves are placed on one side of the piston. It is possible to improve the ratio. In addition, the shape of the inner peripheral surface of the cylinder and the outer peripheral surface of the piston,
By forming the combustion chamber into an oval shape with the short diameter being the diameter in the direction that connects the intake and exhaust valves, the distance between the intake and exhaust valves can be shortened, thereby making the combustion chamber even more flat. As a result, the compression ratio can be further improved.
第１図は本発明を適用した４サイクル内燃機関
の水平断面図、第２図は第１図の−断面図、
第３図は第１図の−断面略図である。
１……シリンダ、６……吸気孔、７……排気
孔、１１……吸気弁、１２……排気弁。
FIG. 1 is a horizontal cross-sectional view of a four-stroke internal combustion engine to which the present invention is applied, FIG. 2 is a cross-sectional view of FIG.
FIG. 3 is a schematic cross-sectional view of FIG. 1. 1...Cylinder, 6...Intake hole, 7...Exhaust hole, 11...Intake valve, 12...Exhaust valve.
Claims (1)
ンダの一側面に、排気孔をその反対側の側面に開
口し、吸気弁は吸気孔側に、排気弁は排気孔側に
配置し、ピストンの外周面形状及びシリンダの内
周面形状を、吸、排気弁を結ぶ方向の径を短径と
する長円形状に形成したことを特徴とする内燃機
関。1. The intake and exhaust valves are side-valved, with the intake hole opening on one side of the cylinder and the exhaust hole opening on the opposite side.The intake valve is placed on the intake hole side, and the exhaust valve is placed on the exhaust hole side. An internal combustion engine, characterized in that the outer circumferential surface of the piston and the inner circumferential surface of the cylinder are formed into an elliptical shape with the short diameter being the diameter in the direction connecting the intake and exhaust valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15508484A JPS6134314A (en) | 1984-07-25 | 1984-07-25 | Internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15508484A JPS6134314A (en) | 1984-07-25 | 1984-07-25 | Internal-combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6134314A JPS6134314A (en) | 1986-02-18 |
| JPH0262686B2 true JPH0262686B2 (en) | 1990-12-26 |
Family
ID=15598302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15508484A Granted JPS6134314A (en) | 1984-07-25 | 1984-07-25 | Internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6134314A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS522002B2 (en) * | 1974-03-14 | 1977-01-19 | ||
| JPS5970838A (en) * | 1982-10-15 | 1984-04-21 | Honda Motor Co Ltd | Vertical internal-combustion engine for general use |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS522002U (en) * | 1975-06-24 | 1977-01-08 |
-
1984
- 1984-07-25 JP JP15508484A patent/JPS6134314A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS522002B2 (en) * | 1974-03-14 | 1977-01-19 | ||
| JPS5970838A (en) * | 1982-10-15 | 1984-04-21 | Honda Motor Co Ltd | Vertical internal-combustion engine for general use |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6134314A (en) | 1986-02-18 |
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