JPS6138321B2 - - Google Patents
Info
- Publication number
- JPS6138321B2 JPS6138321B2 JP11457379A JP11457379A JPS6138321B2 JP S6138321 B2 JPS6138321 B2 JP S6138321B2 JP 11457379 A JP11457379 A JP 11457379A JP 11457379 A JP11457379 A JP 11457379A JP S6138321 B2 JPS6138321 B2 JP S6138321B2
- Authority
- JP
- Japan
- Prior art keywords
- intake
- exhaust
- exhaust valve
- cylinder
- combustion chamber
- 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
- 238000002485 combustion reaction Methods 0.000 claims description 30
- 230000005540 biological transmission Effects 0.000 claims description 6
- 239000000567 combustion gas Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Description
【発明の詳細な説明】
本発明は、シリンダブロツクに形成されるシリ
ンダ孔、そこに摺動自在に嵌合されるピストン、
およびピストン上においてシリンダヘツドに形成
される燃焼室が何れも横断面小判形もしくは楕円
形をなす四サイクル内燃機関（以下楕円機関と云
う）に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a cylinder hole formed in a cylinder block, a piston slidably fitted into the cylinder hole,
The present invention also relates to a four-cycle internal combustion engine (hereinafter referred to as an elliptical engine) in which the combustion chamber formed in the cylinder head on the piston has an oval or elliptical cross section.
ところでかゝる楕円機関では、横断面小判形も
しくは楕円形の燃焼室に開口される吸、排気弁口
を開閉する吸、排気弁の数を増すことができ、吸
気および排気効率を高めて、コンパクトでしかも
高出力が得られる利点を有するがこのようなもの
では当然にそれらの吸、排気弁を開閉作動する
吸、排弁カム軸の数も多くなるが、本発明はそれ
らの吸、排弁カム軸を駆動し得る構成簡単な、四
サイクル内燃機関の吸、排弁カム軸駆動装置を提
供することを目的とするものである。 By the way, in such an elliptical engine, it is possible to increase the number of intake and exhaust valves that open and close the intake and exhaust valve ports opening into the combustion chamber with an oval or oval cross section, increasing the intake and exhaust efficiency, Although it has the advantage of being compact and producing high output, it naturally requires a large number of intake and exhaust valve camshafts that open and close the intake and exhaust valves. It is an object of the present invention to provide an intake/exhaust valve camshaft drive device for a four-stroke internal combustion engine, which has a simple configuration and can drive a valve camshaft.
以下、図面により本発明の第一実施例について
説明する。本実施例は四気筒四サイクル内燃機関
の場合であつて、その機関本体は、シリンダブロ
ツク１の上部にシリンダヘツド２を重合し、また
その下部にクランクケース３を重合し、それら三
者を締付ボルト等の連結ボルトにより一体に結着
して構成される。 A first embodiment of the present invention will be described below with reference to the drawings. This embodiment is a four-cylinder four-cycle internal combustion engine, and the engine body has a cylinder head 2 superimposed on the upper part of a cylinder block 1, and a crankcase 3 superposed on the lower part thereof, and these three parts are tightened. It is constructed by being tied together with a connecting bolt such as a bolt.
第３図に明瞭に示すように前記シリンダブロツ
ク１には、横断面小判形もしくは楕円形の四つの
シリンダ孔４，４………が、並設され、それらシ
リンダ孔４，４………の小判形もしくは楕円形の
長軸ｌ−ｌは互いに平行であつて、シリンダブロ
ツク１の長手方向に対して横列される。前記四つ
のシリンダ孔４，４………内には、それぞれ横断
面小判形もしくは楕円形のピストン５が摺動自在
に嵌合され、これらのピストン５には、それぞれ
コネクテイングロツド６の小端部７がピストンピ
ン９を介して連結され、またそれらのコネクテイ
ングロツド６の大端部８は、前記クランクケース
３に回転自在に軸架されるクランク軸１０のクラ
ンクピン１１に連結されている。而して前記クラ
ンク軸１０の回転軸線は、前記四つのシリンダ孔
４，４………の横断面小判形もしくは楕円形の長
軸ｌ−ｌと直交している。 As clearly shown in FIG. 3, the cylinder block 1 has four cylinder holes 4, 4, . The long axes l--l of the oval or elliptical shapes are parallel to each other and aligned transversely to the longitudinal direction of the cylinder block 1. A piston 5 having an oval or oval cross section is slidably fitted into each of the four cylinder holes 4, 4, and a small connecting rod 6 is fitted into each of these pistons 5. The ends 7 are connected via a piston pin 9, and the large ends 8 of the connecting rods 6 are connected to a crank pin 11 of a crankshaft 10 rotatably mounted on the crankcase 3. ing. The rotational axis of the crankshaft 10 is perpendicular to the long axis l-l of the oval or elliptical cross-sections of the four cylinder holes 4, 4, .
前記シリンダヘツド２には、横断面小判形もし
くは楕円形をなし、かつクランク軸１０の回転軸
線と直角な垂直断面が略円弧状をなす燃焼室１２
が形成される。横断面小判形もしくは楕円形の燃
焼室１２の、短軸ｓ−ｓで分けられる一方の半部
（第１図右半部）の燃焼室１２壁には、四つの吸
気弁口１３，１３………が互いに直交する２本の
平行線の各交点上において開口され、また他方の
半部（第１図左半部）の燃焼室１２壁には、四つ
の排気弁口１４，１４………が同じく互いに直交
する２本の平行線の各交点上において開口され、
前記四つの吸気弁口１３，１３………と排気弁口
１４，１４………とは、燃焼室１２の短軸ｓ−ｓ
に関して対称的に配置される。 The cylinder head 2 has a combustion chamber 12 having an oval or elliptical cross section and a substantially arcuate vertical cross section perpendicular to the rotational axis of the crankshaft 10.
is formed. The combustion chamber 12, which has an oval or elliptical cross section, has four intake valve ports 13, 13... ... are opened at each intersection of two parallel lines perpendicular to each other, and four exhaust valve ports 14, 14 ... are opened on the wall of the combustion chamber 12 in the other half (the left half in FIG. 1). ... is also opened at each intersection of two parallel lines that are orthogonal to each other,
The four intake valve ports 13, 13... and the exhaust valve ports 14, 14...... are the short axis s-s of the combustion chamber 12.
arranged symmetrically with respect to
前記四つの吸気弁口１３，１３………は、シリ
ンダベツド２に形成した４本の吸気ポート１５
１，１５２，１５３，１５４に連結され、これら
の吸気ポート１５１，１５２，１５３，１５４
は、略等しい長さで、それらの中央に配置される
１本の主吸気ポート１６に集合、連通されてい
る。 The four intake valve ports 13, 13...... are four intake ports 15 formed in the cylinder bed 2.
1 , 15 2 , 15 3 , 15 4 , and these intake ports 15 1 , 15 2 , 15 3 , 15 4
have substantially equal lengths, and are gathered and communicated with one main intake port 16 located at the center thereof.
また、同じように前記四つの排気弁口１４，１
４………は、４本の排気ポート１７１，１７２，
１７３，１７４に連通され、これらの排気ポート
１７１，１７２，１７３，１７４は、略等しい長
さで、それらの中央に配置される１本の主排気ポ
ート１８に集合、連通される。そして１本の主吸
気ポート１６と主排気ポート１８は、シリンダ孔
４の縦中心線Ｌ−Ｌに対して燃焼室１２の長手方
向外側方に傾斜しており、互いにＶ字状に配置さ
れる。 Similarly, the four exhaust valve ports 14, 1
4...... are four exhaust ports 17 1 , 17 2 ,
17 3 , 17 4 , and these exhaust ports 17 1 , 17 2 , 17 3 , 17 4 have approximately equal lengths and are gathered and communicated with one main exhaust port 18 located in the center thereof. be done. One main intake port 16 and one main exhaust port 18 are inclined outward in the longitudinal direction of the combustion chamber 12 with respect to the vertical center line LL of the cylinder hole 4, and are arranged in a V-shape with respect to each other. .
前記主吸気ポート１６の外端は気化器１９に連
通され、また前記主排気ポート１８の外端は排気
管２０に連通される。 The outer end of the main intake port 16 is communicated with a carburetor 19, and the outer end of the main exhaust port 18 is communicated with an exhaust pipe 20.
シリンダヘツド２には、前記四つの吸気弁口１
３，１３………を開閉する４本の吸気弁２１１，
２１２，２１３，２１４が昇降自在に嵌挿され、
これらの吸気弁２１１〜２１４は、前記主吸気ポ
ート１６を取囲むようにシリンダ孔４の縦中心線
Ｌ−Ｌに対して燃焼室１２の長手方向外側方に傾
斜しており、そのうち燃焼室１２の中央寄りにあ
る内側列の２本の吸気弁２１１，２１２は、主吸
気ポート１６よりも内側に、また燃焼室１２の外
側にある外側列の２本の吸気弁２１３，２１４は
主吸気ポート１６よりも外側にあり、吸気弁２１
１，２１２、主吸気ポート１６および吸気弁２１
３，２１４の各軸線は横断面小判形もしくは祭円
形の燃焼室１２の長軸方向に放射状に配置されて
いる。前記吸気弁２１１，２１２，２１３，２１
４上には、シリンダヘツド２に回転自在に軸架さ
れる２本の吸弁カム軸２２，２３がクランク軸１
０と同方向に配設され、それらの吸弁カム軸２
２，２３上のカム２４，２４………がタペツト２
５，２５………を介して吸気弁２１１，２１２，
２１３，２１４に連接されている。また吸気弁２
１１，２１２，２１３，２１４の上端には、それ
ぞれコツタ２６を介して弁座２７が嵌着され、こ
の弁座２７とシリンダヘツド２に形成した弁座面
間２８には、弁ばね２９，３０が介在されてい
る。 The cylinder head 2 has the four intake valve ports 1
3, 13... Four intake valves 21 1 , which open and close
21 2 , 21 3 , 21 4 are inserted so that they can be raised and lowered,
These intake valves 21 1 to 21 4 are inclined outward in the longitudinal direction of the combustion chamber 12 with respect to the vertical center line L-L of the cylinder hole 4 so as to surround the main intake port 16. The two intake valves 21 1 , 21 2 in the inner row near the center of the chamber 12 are located inside the main intake port 16, and the two intake valves 21 3 , 21 2 in the outer row are located outside the combustion chamber 12. 21 4 is located outside the main intake port 16, and the intake valve 21
1 , 21 2 , main intake port 16 and intake valve 21
The axes 3 , 21, and 4 are arranged radially in the long axis direction of the combustion chamber 12, which has an oval or circular cross section. The intake valves 21 1 , 21 2 , 21 3 , 21
4 , two intake camshafts 22 and 23 rotatably mounted on the cylinder head 2 are mounted on the crankshaft 1.
0 and their intake camshafts 2
Cams 24, 24 on top of 2, 23 are tapepet 2
5, 25...... through the intake valves 21 1 , 21 2 ,
It is connected to 21 3 and 21 4 . Also, intake valve 2
A valve seat 27 is fitted onto the upper ends of 1 1 , 21 2 , 21 3 , and 21 4 through a connector 26 , and a valve seat 27 is fitted between the valve seat 27 and the valve seat surface formed on the cylinder head 2 . Springs 29, 30 are interposed.
またシリンダヘツド２には、前記四つの排気弁
口１４，１４………を開閉する４本の排気弁３１
１，３１２，３１３，３１４が昇降自在に嵌挿さ
れ、これらの排気弁３１１，３１２，３１３，３
１４は前記主排気ポート１８を取囲むようにシリ
ンダ孔４の縦中心線Ｌ−Ｌに対して燃焼室１２の
横断面長軸方向外側方に傾斜しており、そのうち
燃焼室１２の中央寄りにある内側列の２本の排気
弁３１１，３１２は主排気ポート１８よりも内側
に、また燃焼室１２の外側にある外側列の２本の
排気弁３１３，３１４は、主排気ポート１８より
も外側にあり、排気弁３１１，３１２、主排気ポ
ート１８、および排気弁３１３，３１４の各軸線
は燃焼室１２の横断面長軸方向に放射状に配置さ
れる。前記内側および各側列の排気弁３１１，３
１２および３１３，３１４上には、それぞれシリ
ンダヘツド２に回転自在に軸架される排弁カム軸
３２，３３がクランク軸１０と同方向に配設さ
れ、それら排弁カム軸３２，３３上のカム３４，
３４………はタペツト３５を介して内側列および
外側列の排気弁３１１，３１２および３１３，３
１４に連接されている。また前記排気弁３１１，
３１２，３１３，３１４の上端には、それぞれコ
ツタ３６を介して弁座３７が嵌着され、この弁座
３７とシリンダヘツド２に形成した弁座面３８間
には、弁ばね３９，４０が介在される。 Further, the cylinder head 2 has four exhaust valves 31 that open and close the four exhaust valve ports 14, 14...
1 , 31 2 , 31 3 , 31 4 are fitted so as to be able to move up and down, and these exhaust valves 31 1 , 31 2 , 31 3 , 3
1 4 are inclined outward in the longitudinal direction of the cross section of the combustion chamber 12 with respect to the vertical center line L-L of the cylinder hole 4 so as to surround the main exhaust port 18, and the portions near the center of the combustion chamber 12 are The two exhaust valves 31 1 and 31 2 in the inner row are located inside the main exhaust port 18, and the two exhaust valves 31 3 and 31 4 in the outer row outside the combustion chamber 12 are located in the main exhaust port 18. The exhaust valves 31 1 , 31 2 , the main exhaust port 18 , and the exhaust valves 31 3 , 31 4 are located outside the ports 18 and their respective axes are arranged radially in the long axis direction of the cross section of the combustion chamber 12 . Exhaust valves 31 1 , 3 of the inner side and each side row
1 2 , 31 3 , 31 4 , exhaust valve camshafts 32 , 33 which are rotatably mounted on the cylinder head 2 are disposed in the same direction as the crankshaft 10 , respectively. cam 34 on 33,
34... are connected to the inner and outer row exhaust valves 31 1 , 31 2 and 31 3 , 3 via the tappet 35 .
1 4 is connected. Further, the exhaust valve 31 1 ,
A valve seat 37 is fitted onto the upper end of each of the valve seats 31 2 , 31 3 , and 31 4 via a stopper 36 , and a valve spring 39 , 40 are interposed.
そして前記内側列の吸気２１１，２１２主吸気
ポート１６および外側列の吸気弁２１３，２１４
と、前記内側弁の排気弁３１１，３１２、主排気
ポート１８および外側列の排気弁３１３，３１４
は、シリンダ孔４の縦軸線Ｌ−Ｌに対して対称的
に配置される。 The intake ports 21 1 , 21 2 main intake ports 16 in the inner row and the intake valves 21 3 , 21 4 in the outer row
and the exhaust valves 31 1 , 31 2 of the inner valve, the main exhaust port 18 and the exhaust valves 31 3 , 31 4 of the outer row.
are arranged symmetrically with respect to the longitudinal axis LL of the cylinder bore 4.
前記内側および外側列の吸気弁２１１，２１２
および２１３，２１４の縦中心線Ii−Ii、および
Io−Ioと、前記内側および外側列の排気弁３１
１，３１２および３１３，３１４の縦中心線Ei
−EiおよびEo−Eoは、何れもシリンダ孔４の縦
中心線Ｌ−Ｌ上の一点Ｏより、等間隔を存して放
射状にのびており、そして２本の吸弁カム軸２
２，２３および２本の排弁カム軸３２，３３の回
転中心ａ，ｂ，ｃ，ｄは、前記吸気弁２１１〜２
１４および排気弁３１１〜３１４の縦中心線Ii−
Ii，Io−Io、およびEi−Ei，Eo−Eoと前記一点Ｏ
を中心として描く円弧Ｃ−Ｃの各交点上にあり、
前記回転中心ａ，ｂ，ｃ，ｄの、円弧Ｃ−Ｃ上の
間隔は何れも等しくなつている。前記吸弁カム軸
２２，２３および排弁カム軸３２，３３の端部に
は、第６図に示すように同一径の歯車４１，４
２，４３，４４が固着され、これらの歯車４１〜
４４は順次に噛合され、そのうち一側端の歯車４
４は、アイドル歯車４５，４６を介してクランク
軸１０上の駆動歯車４７に連動され、吸弁カム軸
２２，２３および排弁カム軸３２，３３は、クラ
ンク軸１０の回転数の1/2の回転数で回転駆動さ
れる。 The inner and outer rows of intake valves 21 1 , 21 2
and the vertical center line Ii-Ii of 21 3 , 21 4 , and
Io-Io and said inner and outer row exhaust valves 31
1 , 31 2 and 31 3 , 31 4 vertical center line Ei
-Ei and Eo-Eo both extend radially from a point O on the longitudinal center line LL of the cylinder hole 4 at equal intervals, and the two valve camshafts 2
2, 23 and the rotation centers a, b, c, d of the two exhaust valve camshafts 32, 33 are the intake valves 21 1 to 2.
1 4 and the vertical center line Ii of the exhaust valves 31 1 to 31 4
Ii, Io-Io, and Ei-Ei, Eo-Eo and the one point O
Located on each intersection of the arc C-C drawn with the center at
The intervals between the rotation centers a, b, c, and d on the arc CC are all equal. At the ends of the intake valve camshafts 22, 23 and the exhaust valve camshafts 32, 33, gears 41, 4 having the same diameter are provided, as shown in FIG.
2, 43, and 44 are fixed, and these gears 41 to 44 are fixed to each other.
The gears 44 are meshed sequentially, and the gear 4 at one end
4 is interlocked with a drive gear 47 on the crankshaft 10 via idle gears 45 and 46, and the intake valve camshafts 22 and 23 and the exhaust valve camshafts 32 and 33 rotate at 1/2 of the rotation speed of the crankshaft 10. It is rotated at a rotation speed of .
小判型もしくは楕円形の燃焼室１２の中央、す
なわちその横断面長軸ｌ−ｌと短軸ｓ−ｓとの交
点上には、点火栓４８が設けられている。 An ignition plug 48 is provided at the center of the oval or elliptical combustion chamber 12, that is, at the intersection of its cross-sectional major axis l-l and minor axis s-s.
次に本発明の第一実施例の作用について説明す
ると、いま機関が運転され、クランク軸１０が回
転されると、駆動歯車４７、アイドル歯車４６，
４５および歯車４４〜４１を介して２本の、吸弁
カム軸２２，２３および排弁カム軸３２，３３を
同時にクランク軸１０の回転数の1/2の回転数で
回転駆動し、ピストン５の下降する吸気行程では
吸気弁２１１〜２１４が開弁して混合気を燃焼室
１２内に吸入し、またピストン５の上昇する排気
行程では燃焼室１２内の燃焼ガスが排出される。 Next, the operation of the first embodiment of the present invention will be explained. When the engine is now operated and the crankshaft 10 is rotated, the drive gear 47, the idle gear 46,
45 and gears 44 to 41, the two intake valve camshafts 22, 23 and the two exhaust valve camshafts 32, 33 are simultaneously driven to rotate at half the rotation speed of the crankshaft 10. In the intake stroke in which the piston 5 descends, the intake valves 21 1 to 21 4 open to suck the air-fuel mixture into the combustion chamber 12, and in the exhaust stroke in which the piston 5 ascends, the combustion gas in the combustion chamber 12 is discharged.
第７，８図には本発明の第二実施例が示されて
いる。この第二実施例では、横断面小判形もしく
は楕円形の燃焼室１２の長軸ｌ−ｌ上にそれぞれ
２個宛吸気弁口１３，１３と排気弁口１４，１４
とを開口した場合で、吸気弁口１３，１３に連通
される２本の吸気ポート１５′１，１５′３は等し
い長さで、１本の主吸気ポート１６に連通され、
また排気弁口１４，１４に連通される２本の排気
ポート１７′１，１７′３は１本の主排気ポート１
８に等しい長さで連通される。また点火栓４８は
燃焼室１２の短軸ｓ−ｓ上において一側に偏して
設けられる。また２本の吸弁カム軸２２には、そ
れぞれ吸気弁２１１，２１３を作動するためのカ
ム２４が設けられ、また２本の排弁カム軸３２に
は、それぞれ排気弁３１１，３１３を作動するた
めのカム３４が設けられる。而してこの第二実施
例も前記第一実施例と同じ作用を奏するが、この
第二実施例では燃焼室１２を、よりコンパクトに
形成できる。 A second embodiment of the invention is shown in FIGS. 7 and 8. In this second embodiment, two intake valve ports 13, 13 and two exhaust valve ports 14, 14 are provided on the long axis l-l of the combustion chamber 12, which has an oval or elliptical cross section.
When the main intake port 16 is opened, the two intake ports 15' 1 and 15' 3 that communicate with the intake valve ports 13 and 13 have equal lengths and communicate with one main intake port 16,
In addition, the two exhaust ports 17' 1 and 17' 3 that communicate with the exhaust valve ports 14 and 14 are replaced by one main exhaust port 1.
The length is equal to 8. Further, the ignition plug 48 is provided biased to one side on the short axis s-s of the combustion chamber 12. Further, the two intake valve camshafts 22 are provided with cams 24 for operating the intake valves 21 1 and 21 3 , respectively, and the two exhaust valve camshafts 32 are provided with exhaust valves 31 1 and 31, respectively. A cam 34 is provided for actuating 3 . This second embodiment also has the same effect as the first embodiment, but in this second embodiment, the combustion chamber 12 can be formed more compactly.
以上のように本発明によれば、シリンダヘツド
に横断面小判形もしくは楕円形の燃焼室に開口さ
れる複数個の吸、排気弁口を開閉する複数個の
吸、排気弁を放射状に配設するとゝもに吸、排気
弁を開閉作動する複数個の吸、排弁カム軸を、ク
ランク軸と平行で、かつ円弧上に等間隔を存して
軸架し、それら吸、排弁カム軸をそれらに固着さ
れる同径の伝動輪を介してクランク軸に連動させ
たので、吸弁カム軸、および排弁カム軸がそれぞ
れ複数本あるにもかゝわらず、それらを一面上に
配列される平歯車、鎖車等の通常の伝動機構で駆
動することが可能であり、特に複数本の吸、排弁
カム軸を、互いに噛合される同径の、歯車等の伝
動輪によつて駆動できるので、伝動輪の数および
種類を最小にすることができ、吸、排弁カム軸
の、構造の簡素化、コンパクト化を可能にする
とゝもに組立性を高め、大巾なコストダウンを図
ることができる。 As described above, according to the present invention, a plurality of intake and exhaust valves opening and closing the intake and exhaust valve ports opening into the combustion chamber having an oval or oval cross section are arranged radially in the cylinder head. Then, a plurality of suction and exhaust valve camshafts that open and close the suction and exhaust valves are mounted parallel to the crankshaft and equally spaced on an arc, and these suction and exhaust valve camshafts are linked to the crankshaft via transmission wheels of the same diameter fixed to them, so even though there are multiple intake and exhaust valve camshafts, they can be arranged on one surface. It is possible to drive with ordinary transmission mechanisms such as spur gears and chain wheels, and in particular, it is possible to drive multiple intake and exhaust valve camshafts by transmission wheels such as gears with the same diameter that are meshed with each other. Since it can be driven, the number and type of transmission wheels can be minimized, and the structure of the intake and exhaust valve camshafts can be simplified and made more compact, which improves ease of assembly and significantly reduces costs. can be achieved.
第１〜６図は本発明の第一実施例を示し、第１
図は第２図−線に沿う縦断面図、第２図は第
３図−線横断面図、第３図は第２図−線
縦断面図、第４図は第１図−線に沿う部分縦
断面図、第５図は第１図−線に沿う部分横断
面図、第６図は吸気カム軸および排気カム軸の伝
動歯車系を示す正面図、第７，８図は本発明の第
二実施例を示し、第７図は第８図−線に沿う
横断面図、第８図は第７図−線に沿う部分断
面図である。
ｌ−ｌ……長軸、ｓ−ｓ……短軸、１……シリ
ンダブロツク、２……シリンダヘツド、３……ク
ランクケース、４……シリンダ孔、５……ピスト
ン、６……コネクテイングロツド、１０……クラ
ンク軸、１２……燃焼室、１３……吸気弁口、１
４……排気弁口、２１１〜２１４……吸気弁、２
２……吸弁カム軸、２３……吸弁カム軸、３１１
〜３１４……排気弁、３２……排弁カム軸、３３
……排弁カム軸、４１，４２，４３，４４……歯
車。
1 to 6 show a first embodiment of the present invention;
The figure is a longitudinal sectional view along the line of Fig. 2, Fig. 3 is a cross-sectional view along the line of Fig. 3, Fig. 4 is a longitudinal sectional view along the line of Fig. 2, and Fig. 4 is a longitudinal sectional view along the line of Fig. 1. FIG. 5 is a partial cross-sectional view along the line of FIG. 1, FIG. 6 is a front view showing the transmission gear system of the intake camshaft and exhaust camshaft, and FIGS. A second embodiment is shown, and FIG. 7 is a cross-sectional view taken along the line of FIG. 8, and FIG. 8 is a partial sectional view taken along the line of FIG. 7. l-l...Long axis, s-s...Short axis, 1...Cylinder block, 2...Cylinder head, 3...Crank case, 4...Cylinder hole, 5...Piston, 6...Connecting Rod, 10...Crankshaft, 12...Combustion chamber, 13...Intake valve port, 1
4...Exhaust valve port, 21 1 to 21 4 ...Intake valve, 2
2... Valve camshaft, 23... Valve camshaft, 31 1
~31 4 ...Exhaust valve, 32...Exhaust valve camshaft, 33
...Discharge valve camshaft, 41, 42, 43, 44...gear.
Claims (1)
有するシリンダブロツクと、このシリンダブロツ
クに重合結着され前記ピストン上に燃焼室を形成
するシリンダヘツドと、前記シリンダブロツク下
に重合結着され前記ピストンにコネクテイングロ
ツドを介して連結されるクランク軸を回転自在に
軸架するクランクケースとを備えた四サイクル内
燃機関において、前記シリンダ孔、ピストン、お
よび燃焼室の横断面形状を何れも小判形もしくは
楕円形に形成し、前記シリンダヘツドには、前記
燃焼室に開口される、複数個の吸、排気弁口を開
閉する複数個の吸、排気弁を放射状に配設する
とゝもにこれらの吸、排気弁を開閉作動する複数
個の吸、排弁カム軸を、前記クランク軸と平行で
かつ円弧上に等間隔を存して軸架し、それら吸、
排弁カム軸を、それらに固着される同径の歯車等
の伝動輪を介してクランク軸に連動させてなる、
四サイクル内燃機関の吸、排弁カム軸駆動装置。1. A cylinder block having a cylinder hole into which a piston is slidably fitted, a cylinder head which is polymerically bonded to this cylinder block and forms a combustion chamber above the piston, and a cylinder head which is polymerically bonded below the cylinder block and has a cylinder hole in which the piston is slidably fitted. In a four-cycle internal combustion engine, the cylinder hole, the piston, and the combustion chamber each have an oval cross-sectional shape. Alternatively, the cylinder head may be formed into an elliptical shape, and the cylinder head may be radially arranged with a plurality of intake and exhaust valves opening and closing a plurality of intake and exhaust valve ports opening into the combustion chamber. A plurality of intake and exhaust valve camshafts for opening and closing the intake and exhaust valves are mounted parallel to the crankshaft and equidistantly spaced on a circular arc,
The exhaust valve camshaft is linked to the crankshaft via transmission wheels such as gears of the same diameter fixed to the exhaust valve camshaft.
Intake and exhaust valve camshaft drive device for four-stroke internal combustion engines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11457379A JPS5638509A (en) | 1979-09-06 | 1979-09-06 | Driving device for suction and exhaust valve cam shaft of four-cycle internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11457379A JPS5638509A (en) | 1979-09-06 | 1979-09-06 | Driving device for suction and exhaust valve cam shaft of four-cycle internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5638509A JPS5638509A (en) | 1981-04-13 |
| JPS6138321B2 true JPS6138321B2 (en) | 1986-08-28 |
Family
ID=14641209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11457379A Granted JPS5638509A (en) | 1979-09-06 | 1979-09-06 | Driving device for suction and exhaust valve cam shaft of four-cycle internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5638509A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57183553A (en) * | 1981-05-08 | 1982-11-11 | Yamaha Motor Co Ltd | Intake device of 4-cycle engine |
| JP2809437B2 (en) * | 1989-08-01 | 1998-10-08 | ヤマハ発動機株式会社 | Multi-valve 4-cycle engine |
-
1979
- 1979-09-06 JP JP11457379A patent/JPS5638509A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5638509A (en) | 1981-04-13 |
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