JPS61185604A - Valve open/close timing varying device for four-cycle engine - Google Patents

Valve open/close timing varying device for four-cycle engine

Info

Publication number
JPS61185604A
JPS61185604A JP2467185A JP2467185A JPS61185604A JP S61185604 A JPS61185604 A JP S61185604A JP 2467185 A JP2467185 A JP 2467185A JP 2467185 A JP2467185 A JP 2467185A JP S61185604 A JPS61185604 A JP S61185604A
Authority
JP
Japan
Prior art keywords
cam
speed
arm
speed 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.)
Granted
Application number
JP2467185A
Other languages
Japanese (ja)
Other versions
JPH061044B2 (en
Inventor
Toshimitsu Ohira
大平　年光
Hiroshi Moritake
森竹　寛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzuki Motor Corp
Original Assignee
Suzuki Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Suzuki Motor Corp filed Critical Suzuki Motor Corp
Priority to JP2467185A priority Critical patent/JPH061044B2/en
Publication of JPS61185604A publication Critical patent/JPS61185604A/en
Publication of JPH061044B2 publication Critical patent/JPH061044B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • 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
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/03—Auxiliary actuators
    • F01L2820/031—Electromagnets

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)

Abstract

PURPOSE:To obtain optimum valve operating characteristics and improve an output, by rockably mounting to a rocker shaft a rocker arm abutting against a low-speed cam and the upper end of a valve and a cam arm abutting against a high-speed cam, and designing to connect or disconnect both the arms. CONSTITUTION:A low-speed cam 2 and a high-speed cam 3 are mounted to a cam shaft 1. A rocker arm 4 abutting against the upper end of a valve stem at one end abuts against the low-speed cam 2 at the other end, and a cam arm 7 abuts against the high-speed cam 3. Both the arms 4 and 7 are formed with through-holes 9. In high-speed running, a pin 8 inserted into the through- hole 9 of the cam arm 7 is pushed by a push rod 13 operated by an electromag netic device 12, and is inserted into the through-hole 9 of the rocker arm 4, thereby connecting both the arms 4 and 7 and letting the rocker arm 4 follow the high-speed cam 3. Thus, the valve is driven with optimum operating characteristics according to engine speeds to thereby obtain a high output over the entire range and improve fuel consumption.

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開閉タイミン
グ可変装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a variable valve opening/closing timing device for a four-stroke engine.

〔発明の技術的背景と問題点］ ４サイクルエンジンは、クランクシャフトに連動するカ
ムで、ロッカーアームを揺動させて、吸気及び排気用の
傘形のバルブを押下げて開くようにしている。従って、
吸排気バルブの開閉タイミングは、吸排気用のカムの形
状によって定まる。[Technical Background and Problems of the Invention] A four-stroke engine uses a cam linked to a crankshaft to swing a rocker arm to push down and open umbrella-shaped intake and exhaust valves. Therefore,
The opening and closing timing of the intake and exhaust valves is determined by the shape of the intake and exhaust cams.

４サイクルエンジンは、高速になるに従って、バルブの
開く時期を早くし、開度も大きくして、十分吸排気でき
るようにしないと、吸排気が遅れて、高出力が発生でき
ない。しかし、カム形状によって、バルブのＩＩ）Ｊ閉
タイミングが定まるので、エンジンの使用状況にマツチ
させて、高速又は低速の何れかを重視したカム形状を定
めており、高速を゛重視すれば低速性能が劣り、逆の場
合もある。ロッカーアームにバルブリフターを設ける等
によってタイミングを可変するものも提案されているが
、構造が複雑で、油圧によるので訴整がむづかしく、実
用的でない。As the speed of a 4-cycle engine increases, the valves must open earlier and the opening degree be increased to allow sufficient intake and exhaust, otherwise intake and exhaust will be delayed and high output will not be generated. However, since the valve II) J closing timing is determined by the cam shape, the cam shape is determined to match the usage conditions of the engine and emphasizes either high speed or low speed. may be inferior, and vice versa. Some proposals have been made to vary the timing by installing a valve lifter on the rocker arm, but the structure is complex, and since it relies on hydraulic pressure, it is difficult to adjust, making it impractical.

〔発明の目的〕[Purpose of the invention]

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、ロッカーアームとカムアームをピ
ンで断接させ、ピンを回転数依存の押ロッドで可動させ
て、高低速共に適切なバルブの開閉ができて全域で高出
力が得られる４サイクルエンジンのバルブ開閉タイミン
グ可変装置を得ることを目的とする。In view of this, this invention provides two cams, a low-speed cam and a high-speed cam, connects and disconnects the rocker arm and cam arm with a pin, and moves the pin with a push rod depending on the rotation speed, so that both high and low speeds can be controlled. The purpose of the present invention is to obtain a variable valve opening/closing timing device for a four-stroke engine that can appropriately open and close the valves and obtain high output over the entire range.

〔発明の購成］ 以下、本発明を図面に示す実角例について説明する。[Purchase of invention] Hereinafter, the present invention will be explained with reference to a real angle example shown in the drawings.

カムシャフトｌは、クランクシャフト忙タイミングベル
ト等で連動して回転するよう処してあって、低速用カム
２と高速用カム３を並べて設けである。ロッカーアーム
４は、ロッカーシャフト５に揺動自在に軸着してあって
、先端で、吸気又は排気用の傘形のバルブ６を押下げて
開くようにしである。そして、他端は、低速用カム２に
当接させである。カムアーム７は、ロッカーシャフト５
にロッカーアーム４と運べて揺動自在に軸着し、先端を
高速用カム３に当接させである。カムアーム７には、ピ
ン８が摺動自在に挿入され、ピン８の先端は、ロッカー
アーム４の孔９に噛脱させるよう圧してあって、通常は
、バネ１０で抜ける方向に付勢しである。ピン８は、ス
ラストベアリング１１を介して、電磁ソレノイド１２の
押しロッド１３で押すことができるようにしてあり、電
磁ソレノイド１２には、回転検出スイッチ１４によって
高速時に通電される。電磁ソレノイド１２は、油圧シリ
ンダーに置換えてもよく、又、回転検出スイッチ１４は
、スロットルレバー、オイルポンプの油田スイッチ等、
回転に近似するもの忙置換えてもよい。The camshaft 1 is arranged to rotate in conjunction with a crankshaft timing belt or the like, and has a low-speed cam 2 and a high-speed cam 3 arranged side by side. The rocker arm 4 is pivotably attached to a rocker shaft 5, and is configured to open an umbrella-shaped intake or exhaust valve 6 at its tip by pushing down. The other end is brought into contact with the low speed cam 2. The cam arm 7 is connected to the rocker shaft 5
The rocker arm 4 is pivotally attached to the rocker arm 4 so that it can be moved and swung freely, and the tip is brought into contact with the high-speed cam 3. A pin 8 is slidably inserted into the cam arm 7, and the tip of the pin 8 is pressurized so that it can be inserted into the hole 9 of the rocker arm 4, and is normally biased by a spring 10 in the direction of removal. be. The pin 8 can be pushed by a push rod 13 of an electromagnetic solenoid 12 via a thrust bearing 11, and the electromagnetic solenoid 12 is energized by a rotation detection switch 14 at high speed. The electromagnetic solenoid 12 may be replaced with a hydraulic cylinder, and the rotation detection switch 14 may be replaced with a throttle lever, oil field switch of an oil pump, etc.
You may also replace it with something that approximates rotation.

低速域では、ビ／８がバネ１０の弾力でロッカーアーム
４の孔９から抜けており、低速用カム２によってロッカ
ーアーム４が揺動されて、バルブ６が開閉される。高速
域になると、回転検出スイッチ１４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ＩＯＫ抗し
て押出され、ピン８の先端が孔９に噛合って、カムアー
ム７とロッカーアーム４が連結し、高速用カム３で揺動
するカムアーム７の動きでバルブ６が開閉される。高速
用カム３は、低速用カム２に較べて、開くタイミングが
長くリフトも大きいので、低速用カム２は遊び回転する
だけで支障はない。こうして、高低速に分けて、最適な
タイミングでバルブが開閉でき、高出力が全域で得られ
、燃料消費も少くできる。In the low speed range, the B/8 is pulled out of the hole 9 of the rocker arm 4 by the elasticity of the spring 10, and the rocker arm 4 is swung by the low speed cam 2 to open and close the valve 6. In the high speed range, the rotation detection switch 14 closes, the electromagnetic solenoid 12 is energized, the push rod 13 is pushed out against the spring IOK, the tip of the pin 8 engages with the hole 9, and the cam arm 7 and rocker arm 4 are connected, and the valve 6 is opened and closed by the movement of the cam arm 7 rocked by the high-speed cam 3. Since the high-speed cam 3 has a longer opening timing and a larger lift than the low-speed cam 2, the low-speed cam 2 only rotates idle and there is no problem. In this way, the valves can be opened and closed at optimal timing for high and low speeds, providing high output throughout the entire range and reducing fuel consumption.

〔発明の効果〕〔Effect of the invention〕

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揺動自在に軸着し先端でバル
ブを押下げて開くロッカーアームの他端を低速用カムに
当接させ、ロッカーシャフトに揺動自在に軸着したカム
アームを高速用カムに当接させ、カムアームに摺動自在
に設けたピンを回転数に依存する押しロッドで高速時に
ロッカーアームの孔に−ＴＩ人させてカムアームをロッ
カーアームに連結するようにしたので、低速域では低速
域に最適の低速用カムでバルブを開閉し、高速域では高
速域Ｋｉ＃適の高速用カムでバルブを開閉で鎗、全域で
出力の向上が図れて、燃料消費も少くなる。そして、ピ
ンを抜き差しするだけで、構造が簡単で信頼性が高いも
のＫできる。As explained above, the present invention has a camshaft that is linked to the crankshaft, and a low-speed cam and a high-speed cam that are installed side by side, and are pivotably attached to the rocker shaft, and the rocker is opened by pushing down the valve at the tip of the rocker shaft. The other end of the arm is in contact with a low-speed cam, the cam arm, which is swingably attached to a rocker shaft, is in contact with a high-speed cam, and the pin that is slidably provided on the cam arm is a push rod that depends on the rotational speed. At high speeds, the cam arm is connected to the rocker arm by connecting the cam arm to the rocker arm hole, so at low speeds the valve is opened and closed by the low speed cam that is optimal for the low speed range, and at high speeds the valve is opened and closed by the low speed cam that is suitable for the high speed range. The high-speed cam opens and closes the valve, improving output across the entire range and reducing fuel consumption. By simply inserting and removing pins, a product with a simple structure and high reliability can be created.

【図面の簡単な説明】[Brief explanation of the drawing]

図は本発明の一実施例を示し、第１図は要部を破断面に
した平面図、第２図は第１図Ａ−Ａ矢視側面図である。 ｌ・・・カムシャフト、２・・・低速用カム、３・・・
高速用カム、４・・・ロッカーアーム、５川口、カーシ
ャフト、６・・・バルブ、７・・・カムアーム、８・・
・ピン、９・・・孔、１３・・・押しロッド。The drawings show an embodiment of the present invention, in which FIG. 1 is a plan view showing a main part as a broken surface, and FIG. 2 is a side view taken along the line A--A in FIG. 1. l...Camshaft, 2...Low speed cam, 3...
High-speed cam, 4... Rocker arm, 5 Kawaguchi, car shaft, 6... Valve, 7... Cam arm, 8...
・Pin, 9...hole, 13...push rod.

Claims (1)

【特許請求の範囲】[Claims] 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揺動自在
に軸着し先端でバルブを押下げて開くロッカーアームの
他端を低速用カムに当接させ、ロッカーシャフトに揺動
自在に軸着したカムアームを高速用カムに当接させ、カ
ムアームに摺動自在に設けたピンを回転数に依存する押
しロッドで高速時にロッカーアームの孔に挿入させてカ
ムアームをロッカーアームに連結するようにしたことを
特徴とする、４サイクルエンジンのバルブ開閉タイミン
グ可変装置。A low-speed cam and a high-speed cam are installed side by side on the camshaft that is linked to the crankshaft, and the other end of the rocker arm, which is swingably attached to the rocker shaft and opens by pushing down the valve at the tip, touches the low-speed cam. A cam arm, which is pivotably attached to the rocker shaft, is brought into contact with the high-speed cam, and a pin slidably provided on the cam arm is inserted into the hole in the rocker arm at high speed using a push rod that depends on the rotation speed. A variable valve opening/closing timing device for a four-stroke engine, characterized in that a cam arm is connected to a rocker arm.
JP2467185A 1985-02-12 1985-02-12 Variable valve opening / closing timing device for 4-cycle engine Expired - Fee Related JPH061044B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2467185A JPH061044B2 (en) 1985-02-12 1985-02-12 Variable valve opening / closing timing device for 4-cycle engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2467185A JPH061044B2 (en) 1985-02-12 1985-02-12 Variable valve opening / closing timing device for 4-cycle engine

Publications (2)

Publication Number Publication Date
JPS61185604A true JPS61185604A (en) 1986-08-19
JPH061044B2 JPH061044B2 (en) 1994-01-05

Family

ID=12144598

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2467185A Expired - Fee Related JPH061044B2 (en) 1985-02-12 1985-02-12 Variable valve opening / closing timing device for 4-cycle engine

Country Status (1)

Country Link
JP (1) JPH061044B2 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01285611A (en) * 1988-05-10 1989-11-16 Honda Motor Co Ltd Valve working state switching device for internal combustion engine
FR2701059A1 (en) * 1993-01-29 1994-08-05 Renault Variable timing device for an internal combustion engine
EP0628703A1 (en) * 1993-06-08 1994-12-14 Société Anonyme dite: REGIE NATIONALE DES USINES RENAULT Variable valve timing arrangement for internal combustion engine
FR2714110A1 (en) * 1993-12-17 1995-06-23 Renault Variable distribution equipment for IC engine
EP1031705A3 (en) * 1999-02-23 2001-09-26 Eaton Corporation Electromechanical latching rocker arm valve deactivator
JP2012077633A (en) * 2010-09-30 2012-04-19 Honda Motor Co Ltd Variable valve device of internal combustion engine
JP2012077741A (en) * 2010-09-07 2012-04-19 Honda Motor Co Ltd Variable valve system of internal combustion engine
JP2013130198A (en) * 2009-08-24 2013-07-04 Yamaha Motor Co Ltd Saddled vehicle
JP2013209893A (en) * 2012-03-30 2013-10-10 Honda Motor Co Ltd Variable valve gear for internal combustion engine
EP2756172A1 (en) * 2011-09-12 2014-07-23 Valeo Systemes De Controle Moteur System for transmitting movement from at least two cams to at least one valve
CN106948897A (en) * 2017-02-20 2017-07-14 浙江大学 A kind of engine valve actuating mechanism of changeable air valve number

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01285611A (en) * 1988-05-10 1989-11-16 Honda Motor Co Ltd Valve working state switching device for internal combustion engine
JPH0545766B2 (en) * 1988-05-10 1993-07-12 Honda Motor Co Ltd
FR2701059A1 (en) * 1993-01-29 1994-08-05 Renault Variable timing device for an internal combustion engine
EP0628703A1 (en) * 1993-06-08 1994-12-14 Société Anonyme dite: REGIE NATIONALE DES USINES RENAULT Variable valve timing arrangement for internal combustion engine
FR2706180A1 (en) * 1993-06-08 1994-12-16 Renault Variable distribution device for internal combustion engine.
FR2714110A1 (en) * 1993-12-17 1995-06-23 Renault Variable distribution equipment for IC engine
EP1031705A3 (en) * 1999-02-23 2001-09-26 Eaton Corporation Electromechanical latching rocker arm valve deactivator
JP2013130198A (en) * 2009-08-24 2013-07-04 Yamaha Motor Co Ltd Saddled vehicle
JP2013151940A (en) * 2009-08-24 2013-08-08 Yamaha Motor Co Ltd Variable valve gear
JP2012077741A (en) * 2010-09-07 2012-04-19 Honda Motor Co Ltd Variable valve system of internal combustion engine
JP2012077633A (en) * 2010-09-30 2012-04-19 Honda Motor Co Ltd Variable valve device of internal combustion engine
EP2756172A1 (en) * 2011-09-12 2014-07-23 Valeo Systemes De Controle Moteur System for transmitting movement from at least two cams to at least one valve
JP2013209893A (en) * 2012-03-30 2013-10-10 Honda Motor Co Ltd Variable valve gear for internal combustion engine
CN106948897A (en) * 2017-02-20 2017-07-14 浙江大学 A kind of engine valve actuating mechanism of changeable air valve number

Also Published As

Publication number Publication date
JPH061044B2 (en) 1994-01-05

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