JPH01121504A - Valve timing changing device for four-cycle engine - Google Patents
Valve timing changing device for four-cycle engineInfo
- Publication number
- JPH01121504A JPH01121504A JP62278238A JP27823887A JPH01121504A JP H01121504 A JPH01121504 A JP H01121504A JP 62278238 A JP62278238 A JP 62278238A JP 27823887 A JP27823887 A JP 27823887A JP H01121504 A JPH01121504 A JP H01121504A
- Authority
- JP
- Japan
- Prior art keywords
- speed
- low
- pivot
- cam
- rocker arm
- 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
- 238000002485 combustion reaction Methods 0.000 description 2
Landscapes
- Valve Device For Special Equipments (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、四サイクルエンジンのバルブタイミンク可
変装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a variable valve timing device for a four-stroke engine.
（従来の技術とその問題点）
四サイクルエンジンは、シリンダーの上部に連結したシ
リンダーヘッドに、傘型の吸気弁及び排気弁を取付けて
開ｍし、吸気を吸入させたり、排気を構出させたりして
いる。吸気弁及び排気弁は、バネで口１じるようにして
付勢してあり、クランク軸に連動するカム軸のカムの回
転で、口°ツカ−アームを揺動させて、吸気弁及び排気
弁を各々バネに抗して押下げて聞（ようにしている。従
って、吸気弁及び排気弁の開１１タイミング及びバルブ
リフト量は、カム軸のカムの形状によって定まる。(Conventional technology and its problems) In a four-stroke engine, an umbrella-shaped intake valve and an exhaust valve are attached to a cylinder head connected to the upper part of the cylinder, and the valves are opened to take in air or release exhaust air. I'm doing it. The intake valve and the exhaust valve are biased by a spring so that the opening of the intake valve and the exhaust valve are closed, and the rotation of the cam of the camshaft linked to the crankshaft causes the opening lever arm to swing. Each valve is pressed down against a spring. Therefore, the opening timing of the intake and exhaust valves and the amount of valve lift are determined by the shape of the cam on the camshaft.
低速時と高速時には、各々最適のバルブタイミングがあ
って、一つのカムで全回転域を満足できない。通常は、
当該エンジンの使用条件に基づいて、カムの形状を、低
速型、高速型などに設定している。高速型と低速型の二
つのカムを設けて、回転数によって切換えて使用し、低
速から高速まで高出力を得られるようにするものがある
。例えば実１Ｆｔ１１１ｉ６１−８４１０６号公報、’
１ＺＤｎＫ１６１−５８６０５ Ｑ公報参照。ところが
、切換えが、エンジン回転の変化によって常に行われ、
切換えのスムース性に問題があり、又、耐久性にも問題
がある。There are optimal valve timings for both low and high speeds, and a single cam cannot satisfy the entire rotation range. Normally,
Based on the operating conditions of the engine, the shape of the cam is set to be a low-speed type, a high-speed type, etc. Some cams are equipped with two cams, a high-speed type and a low-speed type, and are switched depending on the rotational speed to obtain high output from low speeds to high speeds. For example, Publication No. 1Ft111i61-84106, '
1ZDnK161-58605 See Q publication. However, switching is always performed due to changes in engine rotation,
There is a problem in the smoothness of switching, and there is also a problem in durability.
この発明は、高低速用の二つのロッカーアームとカムを
設け、油圧ピボットを高速用ロッカーアームに配して、
低速用ロッカーアームが働いているときは高速用ロッカ
ーアームの高速カムを遊ばせ、高速用ロッカーアームが
働いているときは低速用ロッカーアームの低速カムを遊
ばせるように、油圧ピボットによってスムースに切換え
、耐久性す高い四サイクルエンジンのバルブタイミング
可変装置を得ることを目的とする。This invention provides two rocker arms and a cam for high and low speeds, and arranges a hydraulic pivot on the high speed rocker arm.
When the low-speed rocker arm is working, the high-speed cam of the high-speed rocker arm is allowed to play; when the high-speed rocker arm is working, the low-speed cam of the low-speed rocker arm is made free. The purpose of this invention is to obtain a highly durable variable valve timing device for a four-stroke engine.
以下、本発明を図面に承り実施例によって説明する。 Hereinafter, the present invention will be explained with reference to the drawings and examples.
クランク軸１にコネクチングロッド２を介して連結した
ピストン３が摺動して往復動するシリンダー４の上側に
、シリンダーヘッド５が連結される。シリンダーヘッド
５のシリンダー４に臨む部分が燃焼室６になっていて、
吸気孔７と刊気孔８が通じさせてあり、その端に、各々
傘型の吸気用バルブつと排気用バルブ１０が、摺動可能
に取付番ノである。吸気孔７と排気孔８は各々先端が二
股になっていて、一つの燃焼室６に二つの吸気用バルブ
９と二つの排気用バルブ１０を設けた四囲式になってい
る。以下、吸気用バルブ９側について説明する。バルブ
９は、シリンダーヘッド５のバルブステム１１に摺動自
在に挿入してあって、バネ１２で閏じる方向に付勢しで
ある。低速用ロッカーアーム１３は、ＭＱをシリンダー
ヘッド５に植設した固定ピボット１４に支承し、先端が
二股になっていて、二つのバルブ９の上端に当接させて
あり、上面にカム軸１５の低速カム１６を配δする。高
速用ロッカーアーム１７【よ、基端を油圧ピボット１８
に支承させ、先端を低速用ロッカーアーム１３に設けた
横軸１９に袖＠させる。そして、上面にカム軸１５の高
速カム２０を配置する。A cylinder head 5 is connected above a cylinder 4 in which a piston 3 connected to a crankshaft 1 via a connecting rod 2 slides and reciprocates. The part of the cylinder head 5 facing the cylinder 4 is the combustion chamber 6.
The intake hole 7 and the air hole 8 communicate with each other, and an umbrella-shaped intake valve and an exhaust valve 10 are slidably attached to the ends thereof, respectively. The intake hole 7 and the exhaust hole 8 each have a bifurcated tip, and are of a four-enclosed type in which one combustion chamber 6 is provided with two intake valves 9 and two exhaust valves 10. The intake valve 9 side will be explained below. The valve 9 is slidably inserted into the valve stem 11 of the cylinder head 5, and is biased in the pinching direction by a spring 12. The low-speed rocker arm 13 supports the MQ on a fixed pivot 14 installed in the cylinder head 5, has a bifurcated tip, contacts the upper ends of the two valves 9, and has a camshaft 15 on the upper surface. A low speed cam 16 is arranged. High-speed rocker arm 17 [The base end is attached to the hydraulic pivot 18
The tip is supported by the horizontal shaft 19 provided on the low-speed rocker arm 13. Then, the high-speed cam 20 of the camshaft 15 is arranged on the top surface.
油圧ピボット１８には、クランク＠１に連動するオイル
ポンプの油圧が送られるようにしてあって、中速以上に
回転が上昇して油圧が上がると、油圧ピボット１８が油
圧で押上げられて、高速用ロッカーアーム１７の基端を
押上げるようになっている。カム軸１５は、クランク軸
１とチェノ又はタイミングベルトで連動して従動するよ
うにしである１、排気用バルブ１０側も吸気用バルブ９
側と同様に椙成しである。Hydraulic pressure from an oil pump linked to the crank @1 is sent to the hydraulic pivot 18, and when the rotation increases to a medium speed or higher and the oil pressure increases, the hydraulic pivot 18 is pushed up by the oil pressure. The base end of the high-speed rocker arm 17 is pushed up. The camshaft 15 is driven in conjunction with the crankshaft 1 by a chino or timing belt 1, and the exhaust valve 10 side is also connected to the intake valve 9.
Like the side, it is made of suzukishi.
中速以下では、油圧の上昇が少なく、油ルビポット１８
が上昇せず、高速用ロッカーアーム１７が低い位置にあ
る。このため、カム軸１５の回転ににって低速カム１６
が、低速用ロッカーアーム１３を揺動させてバルブ９を
バネ１２に抗して押下げて聞く。中速以上になると、油
圧の上４によって、油圧ピボット１８が、高速用ロッカ
ーアーム１７の基端を押上げ、高速カム２０で高速用ロ
ッカーアーム１７が揺動し、軸着した低速用ロッカーア
ーム１３を介して、バルブ９を押下げて聞く。低速カム
１６が働いている間は、高速カム２０は遊んでおり、高
速カム２０が働くようになると低速カム１６が遊ぶよう
になる。そして、その切換えは、油圧ピボット１８に加
わる油圧によってスムースに切換えられ、油圧ピボット
１８の油圧による上下だけでよいので耐久性もよい。こ
の切換によって、第４図に示ｉｌ−ように、低速時のバ
ルブタイミング八に対し、高速時のバルブタイミングを
８で示すＪ：うに、回転に最適なように可変できて、高
低速共に出力増加を図ることができる。尚、高低速共、
バルブタイミンク△、Ｂは、各々、低速カム１６と高速
カム２０のカムプロフィルによって、任意に選ぶことが
できる。At medium speed or lower, there is little increase in oil pressure, and the oil pressure is 18.
does not rise, and the high-speed rocker arm 17 is at a low position. Therefore, as the camshaft 15 rotates, the low speed cam 16
However, the low speed rocker arm 13 is swung and the valve 9 is pushed down against the spring 12 to listen. When the speed becomes medium or higher, the hydraulic pivot 18 pushes up the base end of the high-speed rocker arm 17 by the hydraulic pressure 4, the high-speed cam 20 swings the high-speed rocker arm 17, and the pivoted low-speed rocker arm 13, press down on valve 9 and listen. While the low speed cam 16 is working, the high speed cam 20 is idle, and when the high speed cam 20 starts working, the low speed cam 16 becomes idle. Further, the switching is smoothly performed by the hydraulic pressure applied to the hydraulic pivot 18, and the durability is good because it is only necessary to move up and down by the hydraulic pressure of the hydraulic pivot 18. By this switching, as shown in Figure 4, the valve timing at high speeds can be varied to be optimal for the rotation, compared to the valve timing at low speeds of 8, and the output is output at both high and low speeds. It is possible to increase the amount. In addition, both high and low speeds,
The valve timings Δ and B can be arbitrarily selected depending on the cam profiles of the low-speed cam 16 and the high-speed cam 20, respectively.
（発明の効果〕
以上説明したように、この発明は、固定ピボットに基端
を支承した低速用ロッカーアームの先端を傘型のバルブ
の上端に当接させると共に上面に低速カムを配し、油圧
ピボットに基端を支承した高速用ロッカーアームの先端
を低速用ロッカーアームの先端近くに軸着すると共に上
面に高速カムを配し、中速以上で油圧ピボットを油圧に
よって押上げるようにしたので、高速カムと低速カムの
選択が、油圧ピボットによってスムースにできる。(Effects of the Invention) As explained above, the present invention has the tip of a low-speed rocker arm whose base end is supported on a fixed pivot contact the upper end of an umbrella-shaped valve, and a low-speed cam is arranged on the upper surface, and the hydraulic The tip of the high-speed rocker arm, whose base end is supported by the pivot, is pivoted near the tip of the low-speed rocker arm, and a high-speed cam is placed on the top surface, so that the hydraulic pivot is pushed up by hydraulic pressure at medium speeds or higher. A hydraulic pivot allows smooth selection of high-speed and low-speed cams.
そして、油圧による油圧ピボットの上下操作でできるの
で、耐久性も高くできる。こうして、高低速カムが、回
転によって使い分けできて、低速高速共に高出力が得ら
れる。And since it can be done by vertically operating a hydraulic pivot using hydraulic pressure, it can also be highly durable. In this way, the high and low speed cams can be used depending on the rotation, and high output can be obtained at both low and high speeds.
第１図乃至第３図は本発明の一実施例を示し、第１図は
全体の縦断面図、第２図は要部の拡大縦断面図、第３図
は同平面図、第４図は高低速のバルブタイミングの可変
例を示すタイミンググラフである。
９．１０・・・バルブ、１３・・・低速用ロッカーアー
ム、１４・・・固定ピボット、１６・・・低速カム、１
７・・・高速用ロッカーアーム、１８・・・油圧ピボッ
ト、２０・・・高速カム。
出願人代理人 藤 本 博 光導 ｌ コ
羊２回
／Ｄ
＄３ 図
第４図1 to 3 show one embodiment of the present invention, in which FIG. 1 is an overall vertical cross-sectional view, FIG. 2 is an enlarged vertical cross-sectional view of main parts, FIG. 3 is a plan view of the same, and FIG. is a timing graph showing an example of variable valve timing at high and low speeds. 9.10...Valve, 13...Low speed rocker arm, 14...Fixed pivot, 16...Low speed cam, 1
7...High-speed rocker arm, 18...Hydraulic pivot, 20...High-speed cam. Applicant's agent Hiroshi Fujimoto Koudou l Kogyo 2 times/D $3 Figure Figure 4
Claims (1)
先端を傘型のバルブの上端に当接させると共に上面に低
速カムを配し、油圧ピボットに基端を支承した高速用ロ
ッカーアームの先端を低速用ロッカーアームの先端近く
に軸着すると共に上面に高速カムを配し、中速以上で油
圧ピボットを油圧によつて押上げるようにしたことを特
徴とする四サイクルエンジンのバルブタイミング可変装
置。The tip of the low-speed rocker arm, whose base end is supported on a fixed pivot, is brought into contact with the upper end of the umbrella-shaped valve, and a low-speed cam is arranged on the top surface, and the tip of the high-speed rocker arm, whose base end is supported on a hydraulic pivot, is placed in contact with the upper end of the umbrella-shaped valve. A variable valve timing device for a four-stroke engine, characterized in that it is pivoted near the tip of a rocker arm and has a high-speed cam on the top surface, so that a hydraulic pivot is pushed up by hydraulic pressure at medium speeds or above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62278238A JPH01121504A (en) | 1987-11-05 | 1987-11-05 | Valve timing changing device for four-cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62278238A JPH01121504A (en) | 1987-11-05 | 1987-11-05 | Valve timing changing device for four-cycle engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01121504A true JPH01121504A (en) | 1989-05-15 |
Family
ID=17594544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62278238A Pending JPH01121504A (en) | 1987-11-05 | 1987-11-05 | Valve timing changing device for four-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01121504A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0367010A (en) * | 1989-08-04 | 1991-03-22 | Nippondenso Co Ltd | Suction and exhaust valve driving mechanism of internal combustion engine |
| KR100444764B1 (en) * | 2001-01-18 | 2004-08-21 | 도쿄파츠고교 가부시키가이샤 | Axial directional gap type eccentric rotor having stop position maintaining unit and flat coreless vibration motor using the rotor |
| JP2004270482A (en) * | 2003-03-06 | 2004-09-30 | Koyo Seiko Co Ltd | Rocker arm |
| JP2009144698A (en) * | 2007-12-14 | 2009-07-02 | Hyundai Motor Co Ltd | Variable valve lift device |
-
1987
- 1987-11-05 JP JP62278238A patent/JPH01121504A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0367010A (en) * | 1989-08-04 | 1991-03-22 | Nippondenso Co Ltd | Suction and exhaust valve driving mechanism of internal combustion engine |
| KR100444764B1 (en) * | 2001-01-18 | 2004-08-21 | 도쿄파츠고교 가부시키가이샤 | Axial directional gap type eccentric rotor having stop position maintaining unit and flat coreless vibration motor using the rotor |
| JP2004270482A (en) * | 2003-03-06 | 2004-09-30 | Koyo Seiko Co Ltd | Rocker arm |
| JP2009144698A (en) * | 2007-12-14 | 2009-07-02 | Hyundai Motor Co Ltd | Variable valve lift device |
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