JP2009270563A - Continuous variable valve lift apparatus - Google Patents

Continuous variable valve lift apparatus Download PDF

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Publication number
JP2009270563A
JP2009270563A JP2008290146A JP2008290146A JP2009270563A JP 2009270563 A JP2009270563 A JP 2009270563A JP 2008290146 A JP2008290146 A JP 2008290146A JP 2008290146 A JP2008290146 A JP 2008290146A JP 2009270563 A JP2009270563 A JP 2009270563A
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Prior art keywords
camshaft
valve lift
variable valve
continuously variable
cam
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JP2008290146A
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Japanese (ja)
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Bosung Shin
普 晟 愼
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Hyundai Motor Co
Kia Corp
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Hyundai Motor Co
Kia Motors Corp
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Publication of JP2009270563A publication Critical patent/JP2009270563A/en
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    • 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
    • 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
    • F01L13/0042—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 with cams being 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
    • F01L1/02—Valve drive
    • 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
    • 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
    • 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
    • F01L1/08—Shape of cams
    • 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
    • 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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
    • 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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • 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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the valves
    • 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
    • F01L2013/0078—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 by modification of cam contact point by axially displacing the camshaft

Abstract

<P>PROBLEM TO BE SOLVED: To provide a continuous variable valve lift apparatus capable of varyingly forming an operation range and varying it according to the operation state of a vehicle and having a compact constitution, a small number of parts and a small volume. <P>SOLUTION: The continuous variable valve lift apparatus includes (a) an input unit, (b) a camshaft receiving rotation from the input unit and connected to allow a variation of a relative position in a longitudinal direction, (c) a control unit controlling the relative position of the camshaft, (d) a slanted cam having a side surface slanted in the longitudinal direction of the camshaft so that a cross section gradually varies and having a shape whose cross section is distorted, (e) a mediating unit reciprocating by the rotation of the slanted cam and (f) a valve opening and closing unit opened and closed by the reciprocation of the mediating unit. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、連続可変バルブリフトに関し、より詳細には、バルブリフト量をエンジンの動作状態によって変化させることができる連続可変バルブリフト装置に関する。   The present invention relates to a continuously variable valve lift, and more particularly to a continuously variable valve lift device capable of changing a valve lift amount according to an operating state of an engine.

一般に、エンジンには、燃料を燃焼させて動力を発生させる燃焼室が形成され、この燃焼室には、燃焼させる燃料が含まれている混合ガスを吸入する吸気バルブ、及び燃焼したガスを排出する排気バルブが形成されている。これら吸気バルブ及び排気バルブは、クランクシャフトに連結されたバルブ開閉機構によって燃焼室を開閉する。通常のバルブ開閉機構は、一定の形状のカムによって常に一定のバルブリフト量を有するため、吸入または排出するガスの量を調節することができない。したがって、エンジンは、その作動領域全般にわたって必要とする最適な状態を発揮することができなくなる。   In general, an engine is formed with a combustion chamber in which fuel is burned to generate power, and an intake valve for sucking a mixed gas containing the fuel to be burned and exhausted gas are discharged into the combustion chamber. An exhaust valve is formed. These intake valve and exhaust valve open and close the combustion chamber by a valve opening and closing mechanism connected to the crankshaft. Since a normal valve opening / closing mechanism always has a constant valve lift amount by a constant shape cam, the amount of gas sucked or discharged cannot be adjusted. Therefore, the engine cannot exhibit the optimum state required over the entire operating range.

バルブ開閉機構が一定形状のカムによってバルブリフトの量が一定であると、吸入または排出するガスの量を調節することができず、エンジンは運転領域全般にわたって最適な状態を発揮することができない。つまり、低速の運転状態に合わせてバルブ開閉機構が設計されると、高速の運転状態ではバルブが開放されている時間及び量が十分でなく、高速の運転状態に合わせて設計されると、低速の運転状態で反対の現象が起こるようになる。   If the valve lift is constant due to the cam having a constant valve opening / closing mechanism, the amount of gas to be sucked or discharged cannot be adjusted, and the engine cannot exhibit an optimum state over the entire operation region. In other words, when the valve opening / closing mechanism is designed for the low-speed operation state, the time and amount of opening the valve is not sufficient in the high-speed operation state, and when designed for the high-speed operation state, The opposite phenomenon occurs in the driving state.

そこで、吸気バルブや排気バルブのリフトタイミング（すなわち、クランクシャフトの回転を基準にした位相）やリフト量を変更することができる可変バルブリフト装置、例えば、低リフトカムと高リフトカムを切り替えることで吸気バルブのリフト量を２段階に変更できる可変バルブリフト装置〔特許文献１参照〕が提案された。近年では、吸気バルブや排気バルブのリフト量を連続的に変更する連続可変バルブリフト装置、例えば、エンジンの燃焼安定性、排ガス性能および燃費を向上させ、エンジン出力の低下、エンジン全開性能の低下を抑制する連続可変バルブリフト装置〔特許文献２、特許文献３参照〕、コンパクトな形体にしてシリンダー内での占有空間を減らせる連続可変バルブリフト装置〔特許文献４参照〕などが提案されている。   Therefore, a variable valve lift device that can change the lift timing (that is, the phase based on the rotation of the crankshaft) and the lift amount of the intake valve and exhaust valve, for example, an intake valve by switching between a low lift cam and a high lift cam. Has proposed a variable valve lift device (see Patent Document 1) that can change the lift amount in two stages. In recent years, continuously variable valve lift devices that continuously change the lift amount of intake valves and exhaust valves, for example, improve engine combustion stability, exhaust gas performance and fuel consumption, reduce engine output and engine fully open performance. A continuously variable valve lift device (see Patent Document 2 and Patent Document 3) to be suppressed, a continuously variable valve lift device (see Patent Document 4) that can reduce the occupied space in a cylinder by using a compact shape, and the like have been proposed.

特開２００４−２９３４８３号公報JP 2004-293484 A 特開２００６−３２９１３０号公報JP 2006-329130 A 特開２００６−３２９１３１号公報JP 2006-329131 A 特開２００７−１３８９１０号公報JP 2007-138910 A

上記問題点を解決すべく、本発明の目的は、作動領域を多様に構成して車両の運転状態によって変化させることができ、コンパクトな構成で、部品数が少なく、体積が小さい連続可変バルブリフト装置を提供することにある。   In order to solve the above problems, an object of the present invention is to provide a continuously variable valve lift having a compact structure, a small number of parts, and a small volume, which can be changed according to the driving state of the vehicle by variously configuring the operation region. To provide an apparatus.

上記目的を達成すべく本発明の連続可変バルブリフト装置は、ａ）入力部、ｂ）入力部の回転力が伝達されて、長さ方向に相対的位置変動が可能に連結されたカムシャフト、ｃ）カムシャフトの相対的位置を調節する調節部、ｄ）カムシャフトの長さ方向に、断面積が徐々に変わるように側面が傾き、かつ断面が歪んだ形状の傾斜カム、ｅ）傾斜カムの回転により往復運動する媒介部、ｆ）媒介部の往復運動によって開閉されるバルブ開閉部、を含んで構成される。   In order to achieve the above object, a continuously variable valve lift device according to the present invention comprises: a) an input portion; b) a camshaft connected to the rotational force of the input portion so as to be capable of relative position fluctuation in the length direction; c) an adjusting portion for adjusting the relative position of the camshaft; d) an inclined cam whose side surface is inclined so that its cross-sectional area gradually changes in the length direction of the camshaft; And f) a valve opening / closing portion that is opened and closed by the reciprocating motion of the mediating portion.

入力部は、フロントジャーナルを有して、カムシャフトに回転力を伝達するとともに、カムシャフトを長さ方向に相対的位置変動可能に連結している。そして、フロントジャーナルには、カムシャフトを外に押し出す方向に力を与える弾性部が形成されている。   The input unit includes a front journal, transmits a rotational force to the camshaft, and connects the camshaft so that the relative position of the camshaft can be varied. The front journal is formed with an elastic portion that applies force in the direction in which the camshaft is pushed out.

調節部は、カムシャフトの入力部と反対側端部と接触する偏心カムを有して、偏心カムの回転によりカムシャフトの長さ方向相対的位置を調節している。   The adjusting portion has an eccentric cam that contacts an end portion on the opposite side to the input portion of the camshaft, and adjusts the relative position in the longitudinal direction of the camshaft by the rotation of the eccentric cam.

媒介部は、カムシャフトと平行に形成されたロッカーシャフトと、ロッカーシャフトに形成されたロッカーレバーを有し、ロッカーシャフトを中心にロッカーレバーがピボット運動する。ロッカーレバーは、傾斜カムと接触する傾斜部と、バルブ開閉部と接触する出力部とを有して構成される。出力部には、ロッカーレバーのピボット運動によりバルブ開閉部のバルブリフトが発生するリフト区間と、バルブリフトが発生しないゼロリフト区間とを有している。   The intermediate portion has a rocker shaft formed parallel to the camshaft and a rocker lever formed on the rocker shaft, and the rocker lever pivots around the rocker shaft. The rocker lever includes an inclined portion that comes into contact with the inclined cam and an output portion that comes into contact with the valve opening / closing portion. The output section has a lift section in which the valve lift of the valve opening / closing section is generated by the pivot movement of the rocker lever, and a zero lift section in which no valve lift is generated.

本発明の連続可変バルブリフト装置は、構造が簡単で、部品数が少なく、生産単価及び整備費用を節減することができ、従って、コンパクトな構成で、全体の体積を小さくすることができる。また、出力カムの簡単な設計変更や調節部の調節によって、バルブリフトの調節が容易で、可変気筒装置（Ｃｙｌｉｎｄｅｒ Ｄｅａｃｔｉｖａｔｉｏｎ；ＣＤＡ）モードの運転することができる。   The continuously variable valve lift device of the present invention has a simple structure, a small number of parts, can reduce production unit cost and maintenance cost, and thus can reduce the overall volume with a compact configuration. Further, the valve lift can be easily adjusted by a simple design change of the output cam or adjustment of the adjusting portion, and operation in a variable cylinder device (CDA) mode can be performed.

以下、添付した図面を参照して本発明の好ましい実施の形態を詳細に説明する。
図１は、本発明の実施の形態による連続可変バルブリフト装置の構成を概略的に示した斜視図であり、図２はその部分断面図であり、図３は連続可変バルブリフト装置の各構成を概略的に示した図面である。 Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view schematically showing a configuration of a continuously variable valve lift device according to an embodiment of the present invention, FIG. 2 is a partial cross-sectional view thereof, and FIG. 3 shows each configuration of the continuously variable valve lift device. FIG.

図１〜図３を参照すると、本発明の連続可変バルブリフト装置は、回転力が伝達される入力部１００、入力部１００からの回転力が伝達されて、長さ方向に相対的位置を変動可能に連結されたカムシャフト２００、カムシャフト２００の位置を調節するように形成された調節部３００を含んで構成されている。   Referring to FIGS. 1 to 3, the continuously variable valve lift device according to the present invention has an input unit 100 to which a rotational force is transmitted, and a rotational force from the input unit 100 is transmitted to change a relative position in the length direction. The camshaft 200 is operatively connected to the camshaft 200, and the adjusting portion 300 is configured to adjust the position of the camshaft 200.

カムシャフト２００には、断面積が徐々に変る、具体的には入力部１００から調節部３００に向かって徐々に大きくなるように側面が傾き、かつ断面が歪んだ形状の傾斜カム２１０が取付けられている。つまり、傾斜カム２１０は、代表的には図１に示しているようにゆがんだ円錐形状に形成されている。   The camshaft 200 is provided with an inclined cam 210 having a shape in which the cross-sectional area gradually changes, specifically, the side surface is inclined and the cross-sectional shape is distorted so as to gradually increase from the input unit 100 toward the adjustment unit 300. ing. That is, the inclined cam 210 is typically formed in a distorted conical shape as shown in FIG.

傾斜カム２１０は、カムシャフト２００とともに回転して、その歪んだ断面形状により、側面で接触する媒介部４００にピボット運動を発生させている。そして媒介部４００のピボット運動は、バルブ開閉部５００に伝達される。   The inclined cam 210 rotates together with the camshaft 200 and generates a pivoting motion in the mediating portion 400 that is in contact with the side surface due to its distorted cross-sectional shape. Then, the pivoting motion of the mediating unit 400 is transmitted to the valve opening / closing unit 500.

入力部１００は、カムシャフトスプロケット１１０とフロントジャーナル１２０で構成され〔図３（ａ）参照〕て、フロントジャーナル１２０にあるフロントジャーナル結合部１２５〔図３（ｂ）参照〕に、カムシャフト２００の一端に形成されたカムシャフト結合部２０５〔図３（ｃ）参照〕が挿入される。これにより、入力部１００とカムシャフト２００が結合し、入力部１００の回転がカムシャフト２００に伝えられる。また、フロントジャーナル１２０内部には弾性部１３０があり〔図３（ａ）参照〕、カムシャフト２００を外に押出すような力を働いて、カムシャフト２００を長さ方向に相対的位置を変えられるようにしている。尚、図３では、フロントジャーナル結合部１２５とカムシャフト結合部２０５が楕円形に表示されているが、この形状に限定されず一般的なスプラインや多角形も可能である。   The input unit 100 includes a camshaft sprocket 110 and a front journal 120 (see FIG. 3A), and a front journal coupling unit 125 in the front journal 120 (see FIG. 3B) is connected to the camshaft 200. A camshaft coupling portion 205 (see FIG. 3C) formed at one end is inserted. As a result, the input unit 100 and the camshaft 200 are coupled, and the rotation of the input unit 100 is transmitted to the camshaft 200. The front journal 120 has an elastic portion 130 (see FIG. 3A), and the camshaft 200 changes its relative position in the length direction by exerting a force that pushes the camshaft 200 outward. I am trying to do it. In FIG. 3, the front journal coupling portion 125 and the camshaft coupling portion 205 are displayed in an elliptical shape. However, the shape is not limited to this shape, and general splines and polygons are also possible.

カムシャフト２００の他端は、調節部３００の偏心カム３１０と接していて、弾性部１３０によりカムシャフト２００を偏心カム３１０の方向に押している。一方、偏心カム３１０の偏心により、弾性部１３０の力に抗してカムシャフト２００を長さ方向に移動させ、カムシャフト２００に形成された傾斜カム２１０の位置を変えることになる。   The other end of the camshaft 200 is in contact with the eccentric cam 310 of the adjustment unit 300, and the camshaft 200 is pushed in the direction of the eccentric cam 310 by the elastic unit 130. On the other hand, due to the eccentricity of the eccentric cam 310, the camshaft 200 is moved in the length direction against the force of the elastic portion 130, and the position of the inclined cam 210 formed on the camshaft 200 is changed.

偏心カム３１０は、エンジンの動作状態などを判断するエンジンコントロールユニット（ｅｌｅｃｔｒｏｎｉｃ ｃｏｎｔｒｏｌ ｕｎｉｔ；ＥＣＵ、図示してない）によって制御されている。ＥＣＵの作動、偏心カム３１０の角度制御などは、エンジンの要求性能によって異なり、このような偏心カム３１０の角度制御は、当該技術分野の通常の技術者が本発明の詳細な説明を通して実現可能なので、ここでの詳細な説明は省略する。   The eccentric cam 310 is controlled by an engine control unit (ECU, not shown) that determines the operating state of the engine. The operation of the ECU, the angle control of the eccentric cam 310, and the like vary depending on the required performance of the engine, and such an angle control of the eccentric cam 310 can be realized by a normal engineer in the art through the detailed description of the present invention. Detailed description will be omitted here.

媒介部４００は、カムシャフト２００と平行に形成されたロッカーシャフト４１０と、ロッカーシャフト４１０に形成されたロッカーレバー４２０で構成され、さらにロッカーレバー４２０は、傾斜カム２１０と接触する傾斜部４２２と、バルブ開閉部５００と接触する出力部４２４で構成されている。
傾斜カム２１０の歪んだ断面形状により、傾斜カム２１０と接する傾斜部４２２が上下に往復運動し、ロッカーレバー４２０がロッカーシャフト４１０を中心にピボット運動するようになる。 The intermediate portion 400 includes a rocker shaft 410 formed parallel to the camshaft 200 and a rocker lever 420 formed on the rocker shaft 410. The rocker lever 420 further includes an inclined portion 422 that contacts the inclined cam 210, The output unit 424 is in contact with the valve opening / closing unit 500.
Due to the distorted cross-sectional shape of the inclined cam 210, the inclined portion 422 in contact with the inclined cam 210 reciprocates up and down, and the rocker lever 420 pivots about the rocker shaft 410.

出力部４２４は、ロッカーレバー４２０のピボット運動によりバルブ開閉部５００のバルブリフトが発生するリフト区間４２６と、バルブ開閉部５００のバルブリフトが発生しないゼロリフト区間４２８があり、これによりバルブ５１０の開放を制御している。つまり、バルブ開閉部５００がリフト区間４２６と接触する間にはバルブ５１０が開放され、ゼロリフト区間４２８と接触する間はバルブ５１０が開放されない。   The output unit 424 includes a lift section 426 in which the valve lift of the valve opening / closing section 500 is generated by the pivoting movement of the rocker lever 420 and a zero lift section 428 in which the valve lift of the valve opening / closing section 500 is not generated. I have control. That is, the valve 510 is opened while the valve opening / closing part 500 is in contact with the lift section 426, and the valve 510 is not opened while it is in contact with the zero lift section 428.

以下、本発明の連続可変バルブリフト装置の作動について説明する。
図４は、連続可変バルブリフト装置のローリフトモードでの作動を、図５は、ハイリフトモードでの作動を示している。
エンジンの要求負荷が小さくなってローリフトモードになると、図４に示すように、偏心カム３１０が回転して、カムシャフト２００の位置がカムシャフトスプロケット１１０から相対的に遠くなる。そうすると、傾斜カム２１０と傾斜部４２２のカムシャフト２００に対する傾きと、偏心カム３１０が偏心する大きさとによって、バルブ５１０の開閉量と開閉時間が相対的に短くなる。つまり、図２に示したゼロリフト区間４２８とバルブ開閉部５００の接触する時間が長くなる。 The operation of the continuously variable valve lift device of the present invention will be described below.
FIG. 4 shows the operation of the continuously variable valve lift device in the low lift mode, and FIG. 5 shows the operation in the high lift mode.
When the required load of the engine is reduced and the low lift mode is entered, as shown in FIG. 4, the eccentric cam 310 rotates and the position of the camshaft 200 becomes relatively far from the camshaft sprocket 110. Then, the opening / closing amount and the opening / closing time of the valve 510 are relatively shortened by the inclination of the inclined cam 210 and the inclined portion 422 with respect to the cam shaft 200 and the magnitude of the eccentric cam 310 being eccentric. That is, the time during which the zero lift section 428 and the valve opening / closing unit 500 shown in FIG.

逆に、エンジンの要求負荷が大きくなってハイリフトモードになると、図５に示すように、偏心カム３１０が回転して、カムシャフト２００の位置がカムシャフトスプロケット１１０に相対的に近くなる。そうすると、傾斜カム２１０と傾斜部４２２のカムシャフト２００に対する傾きと、偏心カム３１０が偏心する大きさとによって、バルブ５１０の開閉量と開閉時間が相対的に長くなる。つまり、図２に示したゼロリフト区間４２８とバルブ開閉部５００が接触する時間が短くなって、リフト区間４２６とバルブ開閉部５００が接触する時間が長くなる。   Conversely, when the required load of the engine increases and the high lift mode is entered, as shown in FIG. 5, the eccentric cam 310 rotates and the position of the camshaft 200 becomes relatively close to the camshaft sprocket 110. Then, the opening / closing amount and the opening / closing time of the valve 510 are relatively long depending on the inclination of the inclined cam 210 and the inclined portion 422 with respect to the cam shaft 200 and the magnitude of the eccentric cam 310 being eccentric. That is, the time for the zero lift section 428 and the valve opening / closing portion 500 shown in FIG. 2 to contact each other is shortened, and the time for the lift section 426 to contact the valve opening / closing portion 500 is increased.

図６は、本発明の実施の形態による連続可変バルブリフト装置のバルブリフトプロファイルの変化を示した図面である。図６に示すように、本発明の連続可変バルブリフト装置では、簡単な偏心カムの作動と傾斜カム及び傾斜部の傾きとによって、エンジンに要求される最適なバルブリフトプロファイルを得ることができる。
また、出力部４２４の形状の設計によっては、可変気筒装置（ＣＤＡ；Ｃｙｌｉｎｄｅｒ Ｄｅａｃｔｉｖａｔｉｏｎ）モードの運転も可能である。 FIG. 6 is a view showing a change in the valve lift profile of the continuously variable valve lift device according to the embodiment of the present invention. As shown in FIG. 6, in the continuously variable valve lift device of the present invention, an optimum valve lift profile required for the engine can be obtained by simple operation of the eccentric cam and inclination of the inclined cam and the inclined portion.
Further, depending on the design of the shape of the output unit 424, operation in a variable cylinder device (CDA) mode is possible.

以上で、本発明の連続可変バルブリフト装置を、好ましい実施の形態を挙げて説明したが、本発明は、この実施の形態に限定されず、本発明の実施の形態から当該発明が属する技術分野で通常の知識を有する者によって容易に変更されて均等だと認められる範囲の全ての変更を含むものである。   The continuous variable valve lift device of the present invention has been described with reference to a preferred embodiment. However, the present invention is not limited to this embodiment, and the technical field to which the present invention belongs from the embodiment of the present invention. It is intended to include all changes within the scope that can be easily changed by those who have ordinary knowledge and are recognized as equivalent.

本発明の実施の形態による連続可変バルブリフト装置の構成を示した斜視図である。It is the perspective view which showed the structure of the continuous variable valve lift apparatus by embodiment of this invention. 本発明の実施の形態による連続可変バルブリフト装置の構成を示した部分断面図である。It is the fragmentary sectional view which showed the structure of the continuous variable valve lift apparatus by embodiment of this invention. 本発明の実施の形態による連続可変バルブリフト装置の各構成を示した図面である。It is drawing which showed each structure of the continuously variable valve lift apparatus by embodiment of this invention. 本発明の実施の形態による連続可変バルブリフト装置のローリフトモードでの作動を示した図面である。3 is a diagram illustrating an operation in a low lift mode of a continuously variable valve lift device according to an exemplary embodiment of the present invention. 本発明の実施の形態による連続可変バルブリフト装置のハイリフトモードでの作動を示した図面である。3 is a diagram illustrating an operation in a high lift mode of a continuously variable valve lift device according to an exemplary embodiment of the present invention. 本発明の実施の形態による連続可変バルブリフト装置のバルブリフトプロファイルの変化を示した図面である。6 is a view showing a change in a valve lift profile of a continuously variable valve lift device according to an embodiment of the present invention.

符号の説明Explanation of symbols

１００；入力部
１１０；カムシャフトスプロケット
１２０；フロントジャーナル
１２５；フロントジャーナル結合部
１３０；弾性部
２００；カムシャフト
２０５；カムシャフト結合部
２１０；傾斜カム
３００；調節部
３１０；偏心カム
４００；媒介部
４１０；ロッカーシャフト
４２０；ロッカーレバー
４２２；傾斜部
４２４；出力部
４２６；リフト区間
４２８；ゼロリフト区間
５００；バルブ開閉部
５１０；バルブ DESCRIPTION OF SYMBOLS 100; Input part 110; Camshaft sprocket 120; Front journal 125; Front journal coupling part 130; Elastic part 200; Camshaft 205; Camshaft coupling part 210; Inclination cam 300; Adjustment part 310; Eccentric cam 400; Rocker shaft 420; rocker lever 422; inclined portion 424; output portion 426; lift section 428; zero lift section 500; valve opening / closing section 510;

Claims (7)

ａ）入力部、
ｂ）前記入力部の回転力が伝達されて、長さ方向に相対的位置変動が可能に連結されたカムシャフト、
ｃ）前記カムシャフトの相対的位置を調節する調節部、
ｄ）前記カムシャフトの長さ方向に、断面積が徐々に変わるように側面が傾き、かつ断面が歪んだ形状の傾斜カム、
ｅ）前記傾斜カムの回転により往復運動する媒介部、
ｆ）前記媒介部の往復運動によって開閉されるバルブ開閉部、を含んで構成されることを特徴とする連続可変バルブリフト装置。 a) input section,
b) A camshaft that is connected so that the rotational force of the input unit is transmitted and relative position variation is possible in the length direction;
c) an adjuster for adjusting the relative position of the camshaft;
d) An inclined cam having a shape in which a side surface is inclined and a cross section is distorted so that a cross-sectional area gradually changes in the length direction of the cam shaft;
e) a mediating portion that reciprocates by rotation of the tilt cam;
f) A continuously variable valve lift device comprising a valve opening / closing part that is opened and closed by a reciprocating motion of the intermediate part. 前記入力部は、フロントジャーナルを有して、前記カムシャフトに回転力を伝達するとともに、前記カムシャフトを長さ方向に相対的位置変動可能に連結することを特徴とする請求項１に記載の連続可変バルブリフト装置。   2. The input unit according to claim 1, wherein the input unit includes a front journal and transmits a rotational force to the camshaft and connects the camshaft so that relative position variation is possible in a length direction. Continuously variable valve lift device. 前記フロントジャーナルには、前記カムシャフトを外に押し出す方向に力を与える弾性部が形成されていることを特徴とする請求項２に記載の連続可変バルブリフト装置。   The continuously variable valve lift device according to claim 2, wherein the front journal is formed with an elastic portion that applies a force in a direction in which the camshaft is pushed out. 前記調節部は、前記カムシャフトの前記入力部と反対側端部と接触する偏心カムを有して、前記偏心カムの回転により前記カムシャフトの長さ方向相対的位置を調節することを特徴とする請求項１に記載の連続可変バルブリフト装置。   The adjusting portion includes an eccentric cam that contacts an end portion opposite to the input portion of the camshaft, and adjusts a relative position in the length direction of the camshaft by rotation of the eccentric cam. The continuously variable valve lift device according to claim 1. 前記媒介部は、前記カムシャフトと平行に形成されたロッカーシャフトと、前記ロッカーシャフトに形成されたロッカーレバーを有し、前記ロッカーシャフトを中心に前記ロッカーレバーがピボット運動することを特徴とする請求項１に記載の連続可変バルブリフト装置。   The mediator includes a rocker shaft formed in parallel with the camshaft and a rocker lever formed on the rocker shaft, and the rocker lever pivots around the rocker shaft. Item 4. The continuously variable valve lift device according to Item 1. 前記ロッカーレバーは、前記傾斜カムと接触する傾斜部と、前記バルブ開閉部と接触する出力部とを有して構成されることを特徴とする請求項５に記載の連続可変バルブリフト装置。   The continuously variable valve lift device according to claim 5, wherein the rocker lever includes an inclined portion that contacts the inclined cam and an output portion that contacts the valve opening / closing portion. 前記出力部は、前記ロッカーレバーのピボット運動により前記バルブ開閉部のバルブリフトが発生するリフト区間と、バルブリフトが発生しないゼロリフト区間とを有することを特徴とする請求項６に記載の連続可変バルブリフト装置。   The continuously variable valve according to claim 6, wherein the output section has a lift section where a valve lift of the valve opening / closing section is generated by a pivot movement of the rocker lever, and a zero lift section where no valve lift is generated. Lift device.
JP2008290146A 2008-04-30 2008-11-12 Continuous variable valve lift apparatus Pending JP2009270563A (en)

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