JPH0639892B2 - Variable valve timing device for 4-cycle engine - Google Patents
Variable valve timing device for 4-cycle engineInfo
- Publication number
- JPH0639892B2 JPH0639892B2 JP60024673A JP2467385A JPH0639892B2 JP H0639892 B2 JPH0639892 B2 JP H0639892B2 JP 60024673 A JP60024673 A JP 60024673A JP 2467385 A JP2467385 A JP 2467385A JP H0639892 B2 JPH0639892 B2 JP H0639892B2
- Authority
- JP
- Japan
- Prior art keywords
- cam
- arm
- rocker
- valve timing
- shaft
- 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
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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
-
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Description
【発明の詳細な説明】 〔発明の技術分野〕 この発明は、４サイクルエンジンのバルブタイミング可
変装置に関する。Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a variable valve timing device for a 4-cycle engine.
４サイクルエンジンは、クランクシヤフトに連動するカ
ムシヤフトのカムで、ロッカーアームを揺動させて、吸
気又は排気用の傘形のバルブを押下げて開くようになっ
ている。従って、吸排気用のバルブの開閉タイミング
は、カムの形状によって決定される。４サイクルエンジ
ンは、高速になると、吸排気の流れに遅れがでるので、
開くタイミングを早く、リフトを大きくすることが望ま
しいが、カム形状で決定されるので、高低速共満足する
ものができず、一方を優先すれば他方が劣ることにな
り、エンジンの使用条件を考慮して何れかのカム形状に
設定している。ロッカーアームにリフターを設けてタイ
ミングを可変するものが提案されているが、構造が複数
で、油圧で作動させるので、動きが微妙で調節がむつか
しく、実用的でない。The four-cycle engine is a cam shaft cam that interlocks with a crank shaft, and swings a rocker arm to push down an umbrella-shaped valve for intake or exhaust to open it. Therefore, the opening / closing timing of the intake / exhaust valve is determined by the shape of the cam. A 4-cycle engine has a delay in the flow of intake and exhaust at high speed, so
It is desirable to open earlier and increase the lift, but since it is determined by the cam shape, it is not possible to satisfy both high and low speeds, and if one is prioritized, the other will be inferior. Then, it is set to one of the cam shapes. It has been proposed that a rocker arm is provided with a lifter to change the timing, but since it has multiple structures and is hydraulically operated, the movement is delicate and adjustment is difficult, which is not practical.
この発明は、かかる点に鑑み、低速用カムと高速用カム
の二つのカムを設け、速度に応じてカムアームを乗替え
させて、バルブタイミングを可変して高低速共高出力が
得られ、作動も確実で信頼性が高い４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。In view of this point, the present invention provides two cams, a low speed cam and a high speed cam, changes the cam arm according to the speed, and changes the valve timing to obtain a high and low speed high output. Another object is to obtain a valve timing varying device for a 4-cycle engine that is reliable and highly reliable.
クランクシヤフトにチエン等で連動させたカムシヤフト
１に、低速域で最適なバルブタイミングになる低速用カ
ム２と高速域で最適なバルブタイミングになる高速用カ
ム３を並設する。そして、ロッカーシヤフト４にビス等
で着脱自在に固定したカムアーム５の先端のスリッパー
部６を低速用カム２に当接させる。又、ロッカーシヤフ
ト４には、スプライン７で軸方向摺動自在にしてロッカ
ーアーム８を挿入軸支する。ロッカーアーム８は、軸方
向に保持片９で挟んで保持し、先端を吸排気用の傘形の
バルブ10の上端に当接させる。ロッカーシヤフト４の一
端には、回転数依存スイッチ11の通電で電磁ソレノイド
12によって押出される押しロッド13を設置する。押しロ
ッド13は、電磁ソレノイド12の通電で、バネ14に抗して
ロッカーシヤフト４を押出す。A cam shaft 1 that is linked to the crank shaft by a chain or the like is provided with a low speed cam 2 that provides optimum valve timing in the low speed region and a high speed cam 3 that provides optimum valve timing in the high speed region. Then, the slipper portion 6 at the tip of the cam arm 5 which is detachably fixed to the rocker shaft 4 with screws or the like is brought into contact with the low speed cam 2. A rocker arm 8 is axially supported by the rocker shaft 4 so as to be slidable in the axial direction by a spline 7. The rocker arm 8 is held by being sandwiched by holding pieces 9 in the axial direction, and its tip is brought into contact with the upper end of an umbrella-shaped valve 10 for intake and exhaust. At one end of the rocker shaft 4, the electromagnetic solenoid is activated when the rotation speed dependent switch 11 is energized.
A push rod 13 which is pushed by 12 is installed. The push rod 13 pushes the rocker shaft 4 against the spring 14 when the electromagnetic solenoid 12 is energized.
低速域では、低速用カム２の回転でカムアーム５を揺動
させ、ロッカーシヤフト４を介してロッカーアーム８を
揺動させて、バルブ10を押下げて開く。高速域になる
と、回転数依存スイッチ11が閉じて電磁ソレノイド12に
通電し、押しロッド13がバネ14に抗してロッカーシヤフ
ト４を押し出すので、カムアーム５が、低速用カム２か
ら高速用カム３に乗り移り、高速用カム３で、バルブ10
が開閉される。ロッカーアーム８は、ロッカーシヤフト
４が動いても、軸方向に保持片９で保持されて同一位置
を保つ。尚、カムアーム５のスリッパー６の側面は、乗
り移り易いように第３図に示すように隅部を落して曲面
にしてある。こうして、高低速共最適なバルブタイミン
グで運転され、高出力が得られ燃料消費も節約できる。In the low speed range, the cam arm 5 is swung by the rotation of the low speed cam 2, the rocker arm 8 is swung via the rocker shaft 4, and the valve 10 is pushed down to open. In the high speed range, the rotation speed dependent switch 11 closes to energize the electromagnetic solenoid 12, and the push rod 13 pushes out the rocker shaft 4 against the spring 14, so that the cam arm 5 moves from the low speed cam 2 to the high speed cam 3 Transfer to the high speed cam 3 and the valve 10
Is opened and closed. The rocker arm 8 is held in the same position by the holding piece 9 in the axial direction even if the rocker shaft 4 moves. Incidentally, the side surface of the slipper 6 of the cam arm 5 is formed into a curved surface with its corners dropped so as to facilitate the transfer. In this way, both high and low speed operation can be performed with optimum valve timing, high output can be obtained, and fuel consumption can be saved.
以上説明したように、この発明は、クランクシャフトに
連動するカムシャフトに低速用カムと高速用カムを並設
し、ロッカーシャフトにビス等で着脱自在に固定したカ
ムアームの先端を低速用カムに当接させ、ロッカーシャ
フトにスプラインで軸方向摺動可能にロッカーアームを
軸支し、ロッカーアームの左右を保持片で止めて先端を
バルブ上端に当接させ、ロッカーシャフトで回転数に応
じて作動する押しロッドによって高速時にスプリングに
抗して押し出して、カムアームを高速用カム移すように
したので、低速域を低速用カムで、高速域を高速用カム
で、バルブタイミングを最適に可変させて運転できて、
高出力が得られると共に燃料消費も少くできる。しかも
カムアームが固着されそのカムアームを移動させるロッ
カーシャフトがロッカーアームに摺動可能に設けられて
いるので、カムアームの移動時においても、ロッカーア
ームの先端は常にバルブ上端の軸心に当接しており、バ
ルブ軸に対して偏心位置に力が作用することがなく、バ
ルブの開閉動作が損われることがなく、バルブスプリン
グの精度も計算し易く、またカムアームとロッカーアー
ムとがそれぞれ別々に作られるので、精度が出し易く、
さらに各部品が損傷・摩耗した時も交換が容易である。
そして、構造が簡単で確実に作動し、信頼性も高いもの
にできる。As described above, according to the present invention, the low speed cam and the high speed cam are arranged side by side on the cam shaft that interlocks with the crankshaft, and the tip of the cam arm that is detachably fixed to the rocker shaft with screws or the like hits the low speed cam. The rocker arm is pivotally supported on the rocker shaft so as to be slidable in the axial direction by a spline, the left and right sides of the rocker arm are stopped by holding pieces, and the tip is brought into contact with the upper end of the valve, and the rocker shaft operates according to the rotation speed. The push rod pushes against the spring at high speed to move the cam arm to the high speed cam, so the low speed cam can operate at low speed and the high speed cam can operate at high speed by optimizing the valve timing. hand,
High output can be obtained and fuel consumption can be reduced. Moreover, since the rocker shaft to which the cam arm is fixed and which moves the cam arm is slidably provided on the rocker arm, the tip of the rocker arm is always in contact with the axial center of the valve upper end even when the cam arm is moved, Since no force acts on the valve shaft at an eccentric position, the opening and closing operation of the valve is not impaired, the accuracy of the valve spring is easy to calculate, and the cam arm and rocker arm are made separately, Accuracy is easy to obtain,
Furthermore, even if each part is damaged or worn, it is easy to replace it.
Further, the structure is simple and operates reliably, and the reliability is high.
図は本発明の一実施例を示し、第１図は一部を破断面と
した平面図、第２図は第１図Ａ−Ａ矢視断面図、第３図
は第１図Ｂ−Ｂ矢視断面図である。 １……カムシヤフト、２……低速用カム、３……高速用
カム、４……ロッカーシヤフト、５……カムアーム、７
……スプライン、８……ロッカーアーム、９……保持
片、10……バルブ、13……押しロッド。FIG. 1 shows an embodiment of the present invention, FIG. 1 is a plan view with a partially broken section, FIG. 2 is a sectional view taken along arrow AA in FIG. 1, and FIG. 3 is FIG. 1B-B. FIG. 1 ... Cam shaft, 2 ... Low speed cam, 3 ... High speed cam, 4 ... Rocker shaft, 5 ... Cam arm, 7
...... Spline, 8 …… Rocker arm, 9 …… Holding piece, 10 …… Valve, 13 …… Push rod.
Claims (1)
に低速用カムと高速用カムを並設し、ロッカーシャフト
にビス等で着脱自在に固定したカムアームの先端を低速
用カムに当接させ、ロッカーシャフトにスプラインで軸
方向摺動可能にロッカーアームを軸支し、ロッカーアー
ムの左右を保持片で止めて先端をバルブ上端に当接さ
せ、ロッカーシャフトで回転数に応じて作動する押しロ
ッドによって高速時にスプリングに抗して押し出して、
カムアームを高速用カムに移すようにしたことを特徴と
する４サイクルエンジンのバルブタイミング可変装置。1. A low speed cam and a high speed cam are arranged side by side on a cam shaft that interlocks with a crankshaft, and the tip of a cam arm that is detachably fixed to the rocker shaft with screws or the like is brought into contact with the low speed cam. The rocker arm is supported by a spline so that it can slide in the axial direction, the left and right sides of the rocker arm are stopped by holding pieces, and the tip of the rocker arm abuts against the upper end of the valve. Push it against the spring,
A variable valve timing device for a four-cycle engine, characterized in that the cam arm is moved to a high-speed cam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60024673A JPH0639892B2 (en) | 1985-02-12 | 1985-02-12 | Variable valve timing device for 4-cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60024673A JPH0639892B2 (en) | 1985-02-12 | 1985-02-12 | Variable valve timing device for 4-cycle engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61185606A JPS61185606A (en) | 1986-08-19 |
| JPH0639892B2 true JPH0639892B2 (en) | 1994-05-25 |
Family
ID=12144652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60024673A Expired - Lifetime JPH0639892B2 (en) | 1985-02-12 | 1985-02-12 | Variable valve timing device for 4-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0639892B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2694786B1 (en) * | 1992-08-12 | 1994-09-23 | Renault | Variable distribution device for internal combustion engine. |
| FR2706180B1 (en) * | 1993-06-08 | 1995-07-13 | Renault | Variable distribution device for internal combustion engine. |
| DE69513320T2 (en) * | 1994-04-12 | 2000-04-13 | Unisia Jecs Corp | Valve train for cylinders of internal combustion engines |
| KR100482076B1 (en) * | 2002-05-31 | 2005-04-13 | 현대자동차주식회사 | a device for opening and closing valve of engine |
| DE102014220385A1 (en) * | 2014-10-08 | 2015-10-29 | Schaeffler Technologies AG & Co. KG | Switchable valve drive of a reciprocating internal combustion engine |
| DE102016210973A1 (en) * | 2016-06-20 | 2017-12-21 | Mahle International Gmbh | Valve train for an internal combustion engine |
| DE102017003439A1 (en) * | 2017-04-08 | 2018-10-11 | Man Truck & Bus Ag | Variable valve train |
| DE102018205730A1 (en) * | 2018-04-16 | 2019-10-17 | Mahle International Gmbh | Rocker arm assembly and a valvetrain |
| JP2019214982A (en) * | 2018-06-13 | 2019-12-19 | 株式会社オティックス | Variable valve mechanism of internal combustion engine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5838602B2 (en) * | 1979-05-09 | 1983-08-24 | トヨタ自動車株式会社 | Variable valve engine control device |
-
1985
- 1985-02-12 JP JP60024673A patent/JPH0639892B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61185606A (en) | 1986-08-19 |
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