JPS60216014A - Valve drive mechanism in internal-combustion engine - Google Patents
Valve drive mechanism in internal-combustion engineInfo
- Publication number
- JPS60216014A JPS60216014A JP7095484A JP7095484A JPS60216014A JP S60216014 A JPS60216014 A JP S60216014A JP 7095484 A JP7095484 A JP 7095484A JP 7095484 A JP7095484 A JP 7095484A JP S60216014 A JPS60216014 A JP S60216014A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- intake
- spring
- exhaust
- valves
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L1/053—Camshafts overhead type
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
【発明の詳細な説明】 〔発明の技術分野〕 本発明は内燃機関の動弁装置に関するものである。[Detailed description of the invention] [Technical field of invention] The present invention relates to a valve train for an internal combustion engine.
４サイクルエンジンにおいて、吸排気弁を複数設けるよ
うにすると、吸排気効率を向上させると共に、弁１個当
りの往復重量を軽量化して高速時における追従性を向上
することができ、エンジンの高性能化を図ることができ
る。このような高性能エンジンにおいて、吸気弁の傘径
を排気弁の傘径より小さくして、その数を排気弁よりも
増やし、吸気弁全体の有効開口面積を大きくすることに
よって一層の高性能化を図った弁機構が特開昭５７−１
７６３１１号公報により提案されている。Providing multiple intake and exhaust valves in a 4-cycle engine improves intake and exhaust efficiency, reduces the reciprocating weight per valve, and improves followability at high speeds, improving engine performance. It is possible to aim for In such a high-performance engine, even higher performance can be achieved by making the diameter of the intake valve smaller than that of the exhaust valve, increasing the number of intake valves compared to the number of exhaust valves, and increasing the effective opening area of the entire intake valve. A valve mechanism designed to
This is proposed in Japanese Patent No. 76311.
ところで、この特開昭５７−１７６３１１号公報に記載
の内燃機関では、動弁機構の吸排気弁を閉弁方向へ付勢
するスプリングが同じ部品で共通化されている。このよ
うにスプリングが共通であることは、コスト上からは有
利であるが、上述のように傘径が吸気弁より大きい排気
弁は、その吸気弁よりも往復重量が大きくなるため、高
速運転時には慣性力の増大によって弁座に当る際に、踊
り現象（ジャンピング）を発生することがあり、上述し
たエンジンの高性能特性を減殺する原因になる。Incidentally, in the internal combustion engine described in Japanese Patent Application Laid-Open No. 57-176311, the springs that bias the intake and exhaust valves of the valve mechanism in the valve closing direction are the same parts. Having a common spring in this way is advantageous from a cost perspective, but as mentioned above, an exhaust valve with a larger umbrella diameter than the intake valve has a larger reciprocating weight than the intake valve, so during high-speed operation Due to the increase in inertial force, a jumping phenomenon may occur when the valve seat hits the valve seat, which causes the above-mentioned high performance characteristics of the engine to be diminished.
本発明の目的は、１気筒当り複数の吸気弁とこれより数
が少なく且つ傘径が大きい排気弁とを設ける場合、その
排気弁の踊り現象を防止することができる内燃機関の動
弁装置を提供することにある。An object of the present invention is to provide a valve operating system for an internal combustion engine that can prevent the dancing phenomenon of exhaust valves when each cylinder is provided with a plurality of intake valves and a smaller number of exhaust valves with a larger diameter. It is about providing.
上記目的を達成するための本発明の動弁装置は、１気筒
当り複数の吸気弁と、この吸気弁より数が少なく且つ傘
径を大きくした排気弁をそれぞれ設け、これら吸排気弁
をスプリングにより閉弁方向に付勢すると共に、弁棒端
部を押圧手段により開弁方向に押圧駆動すべくした内燃
機関において、前記排気弁のスプリングの外径を吸気弁
のスプリングの外径よりも大きくしたことを特徴とする
ものである。In order to achieve the above object, the valve train of the present invention is provided with a plurality of intake valves per cylinder and exhaust valves each having a smaller number and larger diameter than the intake valves, and these intake and exhaust valves are connected by springs. In an internal combustion engine, the outer diameter of the spring of the exhaust valve is larger than the outer diameter of the spring of the intake valve, in an internal combustion engine that is intended to be biased in the valve closing direction and to push the end of the valve stem in the valve opening direction by a pressing means. It is characterized by this.
以下、本発明を図に示す実施例により説明する。 Hereinafter, the present invention will be explained with reference to embodiments shown in the drawings.
図において、１ばシリンダ本体、２はその上部に装着し
たシリンダヘッドである。シリンダヘッド２には、シリ
ンダ本体１のシリンダ３が対応する部分に燃焼室５が形
成されている。この燃焼室５には中央に点火栓の取付孔
１０が設けられ、この取付孔１０を中心にして片側半分
には円弧状に３個の吸気弁８．８．８が配置され、この
吸気弁８を介して吸気通路６に連通している。また、反
対側の片側半分には２個の排気弁９．９が配置され、こ
の排気弁９を介して排気通路７に連通している。上記排
気弁９の傘径りは、吸気弁８の傘径ｄよりも大きくなっ
ている。In the figure, 1 is a cylinder body, and 2 is a cylinder head mounted on the top thereof. A combustion chamber 5 is formed in the cylinder head 2 at a portion corresponding to the cylinder 3 of the cylinder body 1. This combustion chamber 5 is provided with a mounting hole 10 for a spark plug in the center, and three intake valves 8.8.8 are arranged in an arc shape on one half of one side with this mounting hole 10 as the center. It communicates with the intake passage 6 via 8. Further, two exhaust valves 9.9 are arranged on the opposite half, and communicate with the exhaust passage 7 via the exhaust valves 9. The umbrella diameter of the exhaust valve 9 is larger than the umbrella diameter d of the intake valve 8.
上記３個の吸気弁８，８．８は、それぞれ弁棒８ａの中
間部をシリンダへノド２内の弁ガイドに保持されると共
に、上端にバネ受け１２を取付けている。このバネ受け
１２には外径Ｓｔを有するスプリング１３が支持され、
このスプリング１３により、上記弁棒８ａは閉弁方向へ
向けて付勢°されている。このように付勢された弁棒８
ａ上端には、ロッカアーム１１が押圧手段として当接し
、さらにこのロッカアーム１１の上面に、カム軸１５に
一体のカム１４が当接している。カム１４が回転運動す
ると、ロッカアーム１１が間欠的に押し下げられ、この
ロッカアーム１１が弁棒８ａ上端を押圧して、吸気弁８
を開弁させる。The three intake valves 8, 8.8 each have an intermediate portion of the valve stem 8a connected to the cylinder held by a valve guide in the throat 2, and a spring receiver 12 is attached to the upper end. A spring 13 having an outer diameter St is supported by the spring receiver 12,
The spring 13 biases the valve rod 8a in the valve closing direction. Valve stem 8 energized in this way
A rocker arm 11 is in contact with the upper end a as a pressing means, and a cam 14 integrated with a cam shaft 15 is in contact with the upper surface of this rocker arm 11. When the cam 14 rotates, the rocker arm 11 is intermittently pushed down, and the rocker arm 11 presses the upper end of the valve stem 8a, causing the intake valve 8 to open.
Open the valve.
一方、上記２個の排気弁９，９は、上記吸気弁８と同様
に、その弁棒９ａをシリンダへンド２内の弁ガイドに保
持されると共に、弁棒９ａの上端にバネ受はエフを取付
けている。このバネ受け１７には、上記吸気弁８のスプ
リング１３の外径Ｓｉよりも大きな外径Ｓｅを有するス
プリング１Ｂが支持されており、上記弁棒９ａはこのス
プリング１８により閉弁方向へ向けて付勢されている。On the other hand, the two exhaust valves 9, 9, like the intake valve 8, have their valve stems 9a held by the valve guide in the cylinder head 2, and a spring receiver is attached to the upper end of the valve stem 9a. is installed. A spring 1B having an outer diameter Se larger than the outer diameter Si of the spring 13 of the intake valve 8 is supported by the spring receiver 17, and the valve stem 9a is attached by this spring 18 in the valve closing direction. Forced.
このように付勢された弁棒９ａ上端にはロッカアーム１
６が押圧手段として当接し、そのロッカアーム１６の上
面に、カム軸２０に一体のカム１９が当接している。こ
のカム１９が回転運動すると、ロッカアーム１６が間欠
的に押下げられ、このロッカアーム１６が弁棒９ａ上端
を押圧して、排気弁９を開弁させる。A rocker arm 1 is attached to the upper end of the valve stem 9a that is biased in this way.
A cam 19 integral with the camshaft 20 abuts on the upper surface of the rocker arm 16 as a pressing means. When the cam 19 rotates, the rocker arm 16 is intermittently pushed down, and the rocker arm 16 presses the upper end of the valve rod 9a to open the exhaust valve 9.
上述した動弁機構によると、傘径の大きな排気弁９のス
プリング１８は、その外径Ｓｅが吸気弁８のスプリング
１３よりも大きいため、その線径を大きくすることがで
き、バネ定数がスプリング１３よりも大きくなっている
。一方、排気弁９自体は傘径が大きいことにより、その
重量が吸気弁８より大きく、そのため上下運動するとき
の慣性力が大きくなり、高速運転時には踊り（ジャンピ
ング）現象を発生しやすくなるが、上述のように外径Ｓ
ｅが大きく、バネ定数の大きなスプリング１８を使用し
ているため、上記踊り現象を防止することができる。し
たがって、吸排気弁の複数化によって得られるエンジン
の高性能特性を減殺することなく、十分に発揮すること
ができる。According to the above-mentioned valve mechanism, the outer diameter Se of the spring 18 of the exhaust valve 9 having a large umbrella diameter is larger than that of the spring 13 of the intake valve 8, so the wire diameter can be increased, and the spring constant is equal to that of the spring. It is larger than 13. On the other hand, because the exhaust valve 9 itself has a large diameter, its weight is greater than that of the intake valve 8, and therefore the inertia force when moving up and down becomes large, which tends to cause a jumping phenomenon during high-speed operation. As mentioned above, the outer diameter S
Since the spring 18 with a large e and a large spring constant is used, the above-mentioned dancing phenomenon can be prevented. Therefore, the high performance characteristics of the engine obtained by providing a plurality of intake and exhaust valves can be fully utilized without being diminished.
なお、上記実施例では、１気筒当り３個の吸気弁８と２
個の排気弁９を設けるようにしているが、吸気弁８の数
は排気弁９より多い複数であれば２個以上の幾つであっ
てもよく、また、排気弁９の数は吸気弁８より数が少な
く、かつ傘径が吸気弁８よりも大きければ、幾つであっ
てもよい。In the above embodiment, there are three intake valves 8 and 2 per cylinder.
However, the number of intake valves 8 may be two or more as long as the number is greater than the number of exhaust valves 9. As long as the number is smaller and the umbrella diameter is larger than the intake valve 8, the number may be any number.
また、上記実施例は、吸排気弁８，９の弁軸ｆＪａ、９
ａ上端を押下げる押圧手段として、ロッカアーム１１．
１６を使用しているが、リフタを介してカムにより直接
押圧を行うような他の公知の押圧手段を使用してもよい
。Further, in the above embodiment, the valve shafts fJa, 9 of the intake and exhaust valves 8, 9
Rocker arm 11.a serves as a pressing means for pressing down the upper end.
16, other known pressing means such as direct pressing by a cam via a lifter may be used.
上述したように本発明の動弁装置は、１気筒当り複数の
吸気弁と、この吸気弁より数が少なく且つ傘径を大きく
した排気弁をそれぞれ設け、これら吸排気弁をスプリン
グにより閉弁方向に付勢すると共に、弁棒端部を押圧手
段により開弁方向に押圧駆動すべくした内燃機関におい
て、前記排気弁のスプリングの外径を吸気弁のスプリン
グの外径よりも大きくしたので、スプリングの線径を大
きくでき、したがってバネ定数を大きくすることができ
、それによって排気弁の踊り現象を防止することができ
る。As described above, the valve train of the present invention is provided with a plurality of intake valves per cylinder and exhaust valves that are smaller in number than the intake valves and have a larger umbrella diameter, and these intake and exhaust valves are moved in the closing direction by a spring. In an internal combustion engine in which the end of the valve stem is urged in the valve opening direction by a pressing means, the outer diameter of the spring of the exhaust valve is made larger than the outer diameter of the spring of the intake valve. The wire diameter of the exhaust valve can be increased, and therefore the spring constant can be increased, thereby preventing the exhaust valve dancing phenomenon.
第１図は本発明による動弁装置を備えた４サイクルエン
ジンの要部を示す縦断面図、第２図は第１図のｎ−ｎ矢
視図、第３図は第１図の■矢視図である。
１・・・シリンダ本体、 ２・・・シリンダ頭部、５・
・・燃焼室、 ８・・・吸気弁、 ８ａ・・・弁棒、９
・・・排気弁、 ９ａ・・・弁棒、 １２．１７・・・
バネ受け、１３．１８・・・スプリング、１１゜１６・
・・ロッカアーム（押圧手段）。
代理人 弁理士 小 川 信 −
弁理士 野 口 賢 照
弁理士斎下和彦FIG. 1 is a longitudinal cross-sectional view showing the main parts of a four-stroke engine equipped with a valve train according to the present invention, FIG. 2 is a view taken along arrow n-n in FIG. 1, and FIG. This is a perspective view. 1... Cylinder body, 2... Cylinder head, 5...
...Combustion chamber, 8...Intake valve, 8a...Valve rod, 9
...exhaust valve, 9a...valve stem, 12.17...
Spring holder, 13.18...Spring, 11°16.
...Rocker arm (pressing means). Agent: Patent Attorney Shin Ogawa − Patent Attorney Ken Noguchi Teru Patent Attorney Kazuhiko Saishita
Claims (1)
且つ傘径を大きくした排気弁をそれぞれ設け、これら吸
排気弁をスプリングにより閉弁方向に付勢すると共に、
弁棒端部を押圧手段により開弁方向に押圧駆動すべくし
た内燃機関において、前記排気弁のスプリングの外径を
吸気弁のスプリングの外径よりも大きくしたことを特徴
とする内燃機関の動弁装置。Each cylinder is provided with a plurality of intake valves and exhaust valves that are smaller in number than the intake valves and have larger diameters, and these intake and exhaust valves are biased in the valve closing direction by springs, and
An internal combustion engine in which the end of a valve stem is pushed in the valve opening direction by a pushing means, wherein the outer diameter of the spring of the exhaust valve is larger than the outer diameter of the spring of the intake valve. Valve device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7095484A JPS60216014A (en) | 1984-04-11 | 1984-04-11 | Valve drive mechanism in internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7095484A JPS60216014A (en) | 1984-04-11 | 1984-04-11 | Valve drive mechanism in internal-combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60216014A true JPS60216014A (en) | 1985-10-29 |
Family
ID=13446412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7095484A Pending JPS60216014A (en) | 1984-04-11 | 1984-04-11 | Valve drive mechanism in internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60216014A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0347406A (en) * | 1989-07-14 | 1991-02-28 | Yamaha Motor Co Ltd | Valve actuator system of four-cycle engine |
| JPH03115710A (en) * | 1989-09-28 | 1991-05-16 | Mazda Motor Corp | Engine with multiple valve |
| US5495831A (en) * | 1992-02-21 | 1996-03-05 | Audi Ag | Valve actuating mechanism for an internal combustion engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3219019A (en) * | 1962-08-23 | 1965-11-23 | Gen Motors Corp | Internal combustion engine valve gear |
| JPS514416A (en) * | 1974-06-29 | 1976-01-14 | Toyota Motor Co Ltd | Nainenkikanniokeru kyukikyokyuhoho oyobi kozo |
| JPS5650209A (en) * | 1979-10-01 | 1981-05-07 | Mitsubishi Motors Corp | Engine |
| JPS57176311A (en) * | 1981-04-22 | 1982-10-29 | Yamaha Motor Co Ltd | Four-cycle engine |
-
1984
- 1984-04-11 JP JP7095484A patent/JPS60216014A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3219019A (en) * | 1962-08-23 | 1965-11-23 | Gen Motors Corp | Internal combustion engine valve gear |
| JPS514416A (en) * | 1974-06-29 | 1976-01-14 | Toyota Motor Co Ltd | Nainenkikanniokeru kyukikyokyuhoho oyobi kozo |
| JPS5650209A (en) * | 1979-10-01 | 1981-05-07 | Mitsubishi Motors Corp | Engine |
| JPS57176311A (en) * | 1981-04-22 | 1982-10-29 | Yamaha Motor Co Ltd | Four-cycle engine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0347406A (en) * | 1989-07-14 | 1991-02-28 | Yamaha Motor Co Ltd | Valve actuator system of four-cycle engine |
| JPH03115710A (en) * | 1989-09-28 | 1991-05-16 | Mazda Motor Corp | Engine with multiple valve |
| US5495831A (en) * | 1992-02-21 | 1996-03-05 | Audi Ag | Valve actuating mechanism for an internal combustion engine |
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