JP2007170333A - Variable valve train - Google Patents

Variable valve train Download PDF

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Publication number
JP2007170333A
JP2007170333A JP2005372040A JP2005372040A JP2007170333A JP 2007170333 A JP2007170333 A JP 2007170333A JP 2005372040 A JP2005372040 A JP 2005372040A JP 2005372040 A JP2005372040 A JP 2005372040A JP 2007170333 A JP2007170333 A JP 2007170333A
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Japan
Prior art keywords
cam
variable
link
valve
swing
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JP2005372040A
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Japanese (ja)
Inventor
Ken Sugiura
憲 杉浦
Tamotsu Yamamoto
保 山本
Tetsuya Niwa
哲也 丹羽
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Otics Corp
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Otics Corp
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Priority to JP2005372040A priority Critical patent/JP2007170333A/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
    • 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
    • F01L13/0063—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 displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot

Abstract

<P>PROBLEM TO BE SOLVED: To simply construct a power transmitting path from a driving cam to a vale operating member with a small number of parts. <P>SOLUTION: The variable valve train 1 is comprised of a cam shaft 2 having the driving cam 5, a rocker arm 7 for opening and closing a valve 4, an oscillating cam 15 having a cam surface 18 for engagement with the rocker arm 7, a link 18 for transmitting motive power of the driving cam 5 to the oscillating cam 15 and an actuator 12 for driving the link 18. A proximal end of the link 18 is connected to the oscillating cam 15 and a rotary body 21 for contacting with the driving cam 5 is provided at tips of the link 18 and a variable arm 19. The rotary body 21 is connected to a variable cam 14 through the variable arm 19, and a contact position P of the rotary body 21 and the drive cam 5 is varied according to an operation state of an engine by rotating the variable cam 14 with the actuator 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、内燃機関のバルブ特性を可変制御する可変動弁機構に関する。   The present invention relates to a variable valve mechanism that variably controls valve characteristics of an internal combustion engine.

従来、リンクを用いてバルブのリフト量、作用角および開閉タイミングを制御する可変動弁機構が知られている。例えば、図９に示す特許文献１の可変動弁機構１００は、内燃機関のクランク軸（図示略）によって回転されるカムシャフト１０１と、バルブ１０２を開閉する動弁部材１０３とを備えている。カムシャフト１０１上には、駆動カム１０４が一体回動可能に固定されるとともに、動弁部材１０３に係合するカム面１０５を備えた揺動カム１０６が相対回動可能に支持されている。   2. Description of the Related Art Conventionally, a variable valve mechanism that uses a link to control the lift amount, working angle, and opening / closing timing of a valve is known. For example, the variable valve mechanism 100 of Patent Document 1 shown in FIG. 9 includes a camshaft 101 that is rotated by a crankshaft (not shown) of an internal combustion engine, and a valve member 103 that opens and closes the valve 102. On the camshaft 101, a drive cam 104 is fixed so as to be integrally rotatable, and a swing cam 106 having a cam surface 105 that engages with the valve operating member 103 is supported so as to be relatively rotatable.

カムシャフト１０１と平行なコントロールシャフト１０７上には、偏心カム１０８を介して可変リンク１０９が揺動可能に支持されている。可変リンク１０９の一端はリング状リンク１１０で駆動カム１０４に連結され、可変リンク１０９の他端がロッド状リンク１１１で揺動カム１０６に連結されている。そして、駆動カム１０４の動力を三本のリンク１０９，１１０，１１１を介して揺動カム１０６に伝え、可変リンク１０９の揺動角度を偏心カム１０８で変化させて、バルブ１０２のリフト量及び作用角を内燃機関の運転状態に応じて変更するようになっている。
特開平１１−３２４６２５号公報 On the control shaft 107 parallel to the camshaft 101, a variable link 109 is swingably supported via an eccentric cam. One end of the variable link 109 is connected to the drive cam 104 by a ring-shaped link 110, and the other end of the variable link 109 is connected to the swing cam 106 by a rod-shaped link 111. The power of the drive cam 104 is transmitted to the swing cam 106 via the three links 109, 110, and 111, and the swing angle of the variable link 109 is changed by the eccentric cam 108, so that the lift amount and action of the valve 102 are changed. The angle is changed according to the operating state of the internal combustion engine.
JP-A-11-324625

ところが、従来の可変動弁機構１００によると、駆動カム１０４と揺動カム１０６との間に三本のリンク１０９，１１０，１１１を必要とするため、駆動カム１０４から動弁部材１０３までの動力伝達経路が複雑化するという問題点があった。   However, according to the conventional variable valve mechanism 100, three links 109, 110, and 111 are required between the drive cam 104 and the swing cam 106. There was a problem that the transmission path was complicated.

本発明の目的は、上記課題を解決し、駆動カムから動弁部材までの動力伝達経路を少数の部品で簡単に構成できる可変動弁機構を提供することにある。   SUMMARY OF THE INVENTION An object of the present invention is to provide a variable valve mechanism that can solve the above-mentioned problems and that can easily configure a power transmission path from a drive cam to a valve member with a small number of parts.

上記の課題を解決するために、本発明の可変動弁機構は、駆動カムを備えたカムシャフトと、バルブを開閉する動弁部材と、動弁部材に係合するカム面を備えた揺動カムと、駆動カムの動力を揺動カムに伝えるリンクと、リンクを駆動するアクチュエータを備えた可変手段とからなる可変動弁機構において、リンクの基端を揺動カムに連結し、リンクの先端に駆動カムと接触する回転体を設け、可変手段に回転体と駆動カムとの接点位置を変更する可変カムを設けたことを特徴とする。   In order to solve the above problems, a variable valve mechanism according to the present invention includes a camshaft having a drive cam, a valve member for opening and closing the valve, and a swing having a cam surface engaged with the valve member. In a variable valve mechanism comprising a cam, a link for transmitting the power of the drive cam to the swing cam, and a variable means having an actuator for driving the link, the base end of the link is connected to the swing cam, and the tip of the link A rotating body that contacts the driving cam is provided, and a variable cam that changes a contact position between the rotating body and the driving cam is provided in the variable means.

また、本発明は、上記可変動弁機構において次の特徴的手段を提供する。
（１）揺動カムの一端を可変カムに支持し、揺動カムの他端にカム面を形成し、可変カムとリンクの先端とを可変アームで連結し、該連結部に回転体を支持すること。
（２）揺動カムの一端をカムシャフトに支持し、揺動カムの他端にカム面を形成し、リンクの中間部に可変カムに係合する係合部を設けること。 The present invention also provides the following characteristic means in the variable valve mechanism.
(1) One end of the swing cam is supported by the variable cam, a cam surface is formed at the other end of the swing cam, the variable cam and the tip of the link are connected by a variable arm, and the rotating body is supported by the connecting portion. To do.
(2) One end of the swing cam is supported by the cam shaft, a cam surface is formed at the other end of the swing cam, and an engaging portion that engages with the variable cam is provided at an intermediate portion of the link.

なお、動弁部材に関しては次の構成を採用できる。
（３）動弁部材に基端を支点に揺動するロッカアームを使用すること。
（４）動弁部材にバルブの軸線方向へ直線移動可能なバルブリフタを使用すること。 In addition, the following structure is employable regarding a valve operating member.
(3) Use a rocker arm that swings around the base end of the valve member.
(4) A valve lifter that can move linearly in the axial direction of the valve is used as the valve operating member.

本発明の可変動弁機構によれば、駆動カムに接触する回転体をリンクの先端に設け、リンクの基端を揺動カムに連結したので、駆動カムから動弁部材までの動力伝達経路を少数の部品で簡単に構成できるという優れた効果を奏する。   According to the variable valve mechanism of the present invention, the rotating body that contacts the drive cam is provided at the distal end of the link, and the base end of the link is connected to the swing cam. It has an excellent effect that it can be easily configured with a small number of parts.

以下、本発明の実施形態を図面に基づいて説明する。図１、図６に示すように、この実施形態の可変動弁機構１，３１は、駆動カム５を備えたカムシャフト２と、バルブ４を開閉するロッカアーム７と、ロッカアーム７に係合するカム面１６，３３を備えた揺動カム１５，３２と、駆動カム５の動力を揺動カム１５，３２に伝えるリンク１８，３７と、リンク１８，３７を駆動するアクチュエータ１２を備えた可変手段とから構成されている。リンク１８，３７は、基端が揺動カム１５，３２に連結され、先端に駆動カム５と接触する回転体２１，３９を備えている。そして、可変手段に回転体２１，３９と駆動カム５との接点位置Ｐを変更する可変カム１４，３５が設けられている。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 6, the variable valve mechanism 1, 31 of this embodiment includes a camshaft 2 having a drive cam 5, a rocker arm 7 that opens and closes the valve 4, and a cam that engages the rocker arm 7. Oscillating cams 15 and 32 having surfaces 16 and 33; links 18 and 37 for transmitting the power of the drive cam 5 to the oscillating cams 15 and 32; and variable means including an actuator 12 for driving the links 18 and 37. It is composed of The links 18 and 37 are provided with rotating bodies 21 and 39 whose base ends are connected to the swing cams 15 and 32 and in contact with the drive cam 5 at the distal ends. And the variable cams 14 and 35 which change the contact position P of the rotary bodies 21 and 39 and the drive cam 5 are provided in the variable means.

次に、本発明の実施例１を図１〜図５に基づいて説明する。この実施例の可変動弁機構１は自動車用ガソリンエンジンの吸気系に用いられている。ただし、同じ機構をガソリンエンジンの排気系に適用することも可能である。図１に示すように、可変動弁機構１のカムシャフト２はシリンダヘッド３上方のハウジング（図示略）に支持され、エンジンのクランク軸によって回転される。カムシャフト２上には、バルブ４と対応する位置に駆動カム５が固着され、駆動カム５に等半径部５ａとノーズ部５ｂとが形成されている。   Next, Embodiment 1 of the present invention will be described with reference to FIGS. The variable valve mechanism 1 of this embodiment is used in an intake system of an automobile gasoline engine. However, the same mechanism can be applied to the exhaust system of a gasoline engine. As shown in FIG. 1, the camshaft 2 of the variable valve mechanism 1 is supported by a housing (not shown) above the cylinder head 3 and rotated by the crankshaft of the engine. On the camshaft 2, a drive cam 5 is fixed at a position corresponding to the valve 4, and an equal radius portion 5 a and a nose portion 5 b are formed on the drive cam 5.

カムシャフト２の下方にはバルブ４を開閉するロッカアーム７が基端側のピボット８で上下に揺動可能に支持され、バルブ４上のスプリング（図示略）で上方へ付勢されている。ロッカアーム７の先端にはバルブ４を押圧する押圧部９が設けられ、ロッカアーム７の中間部にベースローラ１０が支持されている。ロッカアーム７の上方にはコントロールシャフト１１がカムシャフト２と平行に設けられ、その一端は油圧又は電動のアクチュエータ１２に連結され、アクチュエータ１２が制御装置（図示略）によりエンジンの運転状態に応じて制御される。   Below the camshaft 2, a rocker arm 7 that opens and closes the valve 4 is supported by a pivot 8 on the base end side so as to be swingable up and down, and is urged upward by a spring (not shown) on the valve 4. A pressing portion 9 that presses the valve 4 is provided at the tip of the rocker arm 7, and a base roller 10 is supported on an intermediate portion of the rocker arm 7. A control shaft 11 is provided above the rocker arm 7 in parallel with the camshaft 2, and one end of the control shaft 11 is connected to a hydraulic or electric actuator 12. The actuator 12 is controlled by a control device (not shown) according to the operating state of the engine. Is done.

図２に示すように、コントロールシャフト１１上には可変カム１４と揺動カム１５とが設けられている。揺動カム１５は上下に長く形成され、上端一対のアーム部１５ａにてコントロールシャフト１１に揺動可能に支持されている。揺動カム１５の下端には、ベースローラ１０に係合するカム面１６が形成され、カム面１６にコントロールシャフト１１の軸心を中心とする弧状のベース部１６ａと、これと反対側に湾曲するリフト部１６ｂとが設けられている。可変カム１４は、揺動カム１５の内側において、コントロールシャフト１１にその軸心から偏倚した状態で固定されている。   As shown in FIG. 2, a variable cam 14 and a swing cam 15 are provided on the control shaft 11. The swing cam 15 is formed to be vertically long and is supported by the control shaft 11 so as to be swingable by a pair of upper arm portions 15a. A cam surface 16 that engages with the base roller 10 is formed at the lower end of the swing cam 15, an arc-shaped base portion 16 a centering on the axis of the control shaft 11 on the cam surface 16, and curved on the opposite side. And a lift portion 16b to be provided. The variable cam 14 is fixed to the control shaft 11 inside the swing cam 15 in a state of being deviated from the axis.

揺動カム１５には、リンク１８と可変アーム１９とが組み付けられている。リンク１８は、基端がピン２０で揺動カム１５軸着され、先端が回転体２１の支持軸２３に連結されている。回転体２１は可変アーム１９の先端に支持され、可変アーム１９の基端孔１９ａが可変カム１４に回動可能に外嵌されている。揺動カム１５にはスプリング２４の一端が掛止され、回転体２１を駆動カム５に常時接触させている。そして、可変カム１４が可変アーム１９を介して駆動カム５に対する回転体２１の接点位置Ｐを変更し、リンク１８が駆動カム５の動力を揺動カム１５に伝えるようになっている。   A link 18 and a variable arm 19 are assembled to the swing cam 15. The link 18 has a proximal end attached to the pivot cam 15 by a pin 20 and a distal end connected to a support shaft 23 of the rotating body 21. The rotating body 21 is supported at the distal end of the variable arm 19, and a base end hole 19 a of the variable arm 19 is externally fitted to the variable cam 14 so as to be rotatable. One end of a spring 24 is hooked on the swing cam 15, and the rotating body 21 is always in contact with the drive cam 5. The variable cam 14 changes the contact position P of the rotating body 21 with respect to the drive cam 5 via the variable arm 19, and the link 18 transmits the power of the drive cam 5 to the swing cam 15.

次に、可変動弁機構１の作用を図３〜図５に従って説明する。図３はバルブ４を最小のリフト量で開閉するときの作用を示す。このとき、図３（ａ）に示すように、可変カム１４の中心はコントロールシャフト１１の軸心より左側にあり、可変アーム１９が回転体２１を駆動カム５のノーズ部５ｂから所定角度θ１離れた位相で等半径部５ａに接触させ（接点位置Ｐ１)、揺動カム１５のカム面１６がベース部１６ａにてベースローラ１０に係合している。このため、駆動カム５の等半径部５ａが回転体２１に接触している期間中は、揺動カム１５及びロッカアーム７が共に静止し、バルブ４が閉鎖位置に保持される。   Next, the operation of the variable valve mechanism 1 will be described with reference to FIGS. FIG. 3 shows the operation when the valve 4 is opened and closed with the minimum lift amount. At this time, as shown in FIG. 3A, the center of the variable cam 14 is on the left side of the axis of the control shaft 11, and the variable arm 19 separates the rotating body 21 from the nose portion 5b of the drive cam 5 by a predetermined angle θ1. The cam surface 16 of the swing cam 15 is engaged with the base roller 10 at the base portion 16a. Therefore, during the period in which the equiradius portion 5a of the drive cam 5 is in contact with the rotating body 21, both the swing cam 15 and the rocker arm 7 are stationary, and the valve 4 is held in the closed position.

図３（ｂ）に示すように、カムシャフト２が回転し、駆動カム５のノーズ部５ｂが回転体２１に接触すると、リンク１８が揺動カム１５を右方へ揺動する。このとき、揺動カム１５は比較的小さな角度で揺動し、カム面１６のリフト部１６ｂがベースローラ１０に浅く係合する。従って、ロッカアーム７が僅かに揺動し、バルブ４が最小のリフト量（Ｌｍｉｎ．）で開放され、図５の曲線（イ）に示すように、リフト量及び作用角が最小のバルブ特性が得られる。   As shown in FIG. 3B, when the camshaft 2 rotates and the nose portion 5b of the drive cam 5 contacts the rotating body 21, the link 18 swings the swing cam 15 to the right. At this time, the swing cam 15 swings at a relatively small angle, and the lift portion 16b of the cam surface 16 is shallowly engaged with the base roller 10. Accordingly, the rocker arm 7 is slightly swung, the valve 4 is opened with the minimum lift amount (Lmin.), And the valve characteristic with the minimum lift amount and working angle is obtained as shown by the curve (a) in FIG. It is done.

図４はバルブ４を最大のリフト量で開閉するときの作用を示す。このときは、図４（ａ）に示すように、可変カム１４の中心がコントロールシャフト１１の軸心より右側に切り替えられ、可変アーム１９が回転体２１を駆動カム５のノーズ部５ｂから所定角度θ２（θ２＜θ１）離れた位相で等半径部５ａに接触させる（接点位置Ｐ２）。しかし、駆動カム５と回転体２１との接点位置が変化しても、揺動カム１５はベース部１６ａにてベースローラ１０に係合し続け、このベース部１６ａが揺動カム１５の揺動中心と同心であることから、駆動カム５の等半径部５ａが回転体２１に係合する期間中は、図２（ａ）と同様、バルブ４が閉鎖位置に保持される。   FIG. 4 shows the operation when the valve 4 is opened and closed with the maximum lift amount. At this time, as shown in FIG. 4A, the center of the variable cam 14 is switched to the right side from the axis of the control shaft 11, and the variable arm 19 moves the rotating body 21 from the nose portion 5 b of the drive cam 5 to a predetermined angle. The constant radius portion 5a is brought into contact with a phase separated by θ2 (θ2 <θ1) (contact point position P2). However, even if the contact position between the drive cam 5 and the rotating body 21 changes, the swing cam 15 continues to engage with the base roller 10 at the base portion 16 a, and the base portion 16 a swings the swing cam 15. Since it is concentric with the center, the valve 4 is held in the closed position during the period in which the constant radius portion 5a of the drive cam 5 is engaged with the rotating body 21, as in FIG.

図４（ｂ）に示すように、駆動カム５のノーズ部５ｂが回転体２１に接触すると、リンク１８が揺動カム１５を右方へ揺動する。このとき、可変カム１４が可変アーム１９の支点を駆動カム５から離れた位置に切り替えているので、揺動カム１５が大きな角度で揺動し、リフト部１６ｂの終端がベースローラ１０に深く係合する。このため、ロッカアーム７が大きな角度で揺動し、バルブ４が最大のリフト量（Ｌｍａｘ．）で開放され、図５の曲線（ロ）に示すように、リフト量及び作用角が最大のバルブ特性が得られる。従って、回転体２１と駆動カム５との接点位置をＰ１〜Ｐ２の範囲で変更することにより、バルブ４のリフト量と作用角を図５の曲線（ハ），（ニ），（ホ）に例示するように任意の中間値に制御することができる。   As shown in FIG. 4B, when the nose portion 5b of the drive cam 5 contacts the rotating body 21, the link 18 swings the swing cam 15 to the right. At this time, since the variable cam 14 switches the fulcrum of the variable arm 19 to a position away from the drive cam 5, the swing cam 15 swings at a large angle, and the end of the lift portion 16 b is deeply engaged with the base roller 10. Match. Therefore, the rocker arm 7 swings at a large angle, the valve 4 is opened with the maximum lift amount (Lmax.), And the valve characteristic with the maximum lift amount and working angle is shown in the curve (b) of FIG. Is obtained. Therefore, by changing the contact position between the rotating body 21 and the drive cam 5 in the range of P1 to P2, the lift amount and the operating angle of the valve 4 are changed to the curves (c), (d), (e) in FIG. As illustrated, it can be controlled to an arbitrary intermediate value.

また、実施例１の可変動弁機構１によれば、回転体２１を可変アーム１９とリンク１８の先端に設け、リンク１８の基端を揺動カム１５に連結したので、駆動カム５の動力を一本のリンク１８で揺動カム１５に伝えることができる。このため、駆動カム５からロッカアーム７までの動力伝達経路をリンク１８と揺動カム１５の二部品で簡単に構成することができる。特に、揺動カム１５を上下に長く形成し、その上端を可変カム１４で支持し、下端にカム面１６を設け、中間部の回転体２１を駆動カム５に接触させたので、比較的短いリンク１８を用いて揺動カム１５を大きな角度で揺動できるという利点もある。   Further, according to the variable valve mechanism 1 of the first embodiment, the rotating body 21 is provided at the tip of the variable arm 19 and the link 18, and the base end of the link 18 is connected to the swing cam 15. Can be transmitted to the swing cam 15 by a single link 18. For this reason, the power transmission path from the drive cam 5 to the rocker arm 7 can be easily configured with two parts of the link 18 and the swing cam 15. In particular, the swing cam 15 is formed to be long in the vertical direction, the upper end thereof is supported by the variable cam 14, the cam surface 16 is provided at the lower end, and the intermediate rotating body 21 is brought into contact with the drive cam 5. There is also an advantage that the swing cam 15 can be swung at a large angle using the link 18.

次に、本発明の実施例２を図６〜図８に基づいて説明する。この可変動弁機構３１では、図６に示すように、揺動カム３２の上端がカムシャフト２に支持され、揺動カム３２の下端に実施例１のカム面１６と左右反対向きで略同じプロフィールのカム面３３が形成されている。揺動カム３２の中間部側方にはコントロールシャフト３４がカムシャフト２と平行に設けられ、その一端にアクチュエータ１２が連結され、揺動カム３２と対応する軸線方向位置に可変カム３５が固定されている。   Next, a second embodiment of the present invention will be described with reference to FIGS. In the variable valve mechanism 31, as shown in FIG. 6, the upper end of the swing cam 32 is supported by the camshaft 2, and the lower end of the swing cam 32 is substantially the same in the opposite direction to the cam surface 16 of the first embodiment. A cam surface 33 of the profile is formed. A control shaft 34 is provided in parallel with the camshaft 2 on the side of the middle portion of the swing cam 32, the actuator 12 is connected to one end thereof, and a variable cam 35 is fixed at an axial position corresponding to the swing cam 32. ing.

駆動カム５の動力を揺動カム３２に伝えるリンク３７は「く」字形に屈曲形成され、その基端がピン３８で揺動カム３２に軸着され、先端に駆動カム５と接触する回転体３９が支持されている。リンク３７の中間屈曲部には可変カム３５に係合するローラ４０が支持され、可変カム３５がローラ４０を介してリンク３７を起伏回動し、駆動カム５に対する回転体３９の接点位置Ｐをエンジンの運転状態に応じて変更するようになっている。   A link 37 that transmits the power of the drive cam 5 to the swing cam 32 is bent in a “<” shape, and its base end is pivotally attached to the swing cam 32 by a pin 38 and is in contact with the drive cam 5 at the tip. 39 is supported. A roller 40 that engages with the variable cam 35 is supported at an intermediate bent portion of the link 37, and the variable cam 35 undulates and rotates the link 37 via the roller 40, so that the contact position P of the rotating body 39 with respect to the drive cam 5 is set. It changes according to the operating state of the engine.

次に、可変動弁機構３１の作用を図７、図８に従って説明する。図７はバルブ４を最小のリフト量で開閉するときの作用を示す。このとき、図７（ａ）に示すように、可変カム３５が等半径部３５ａにてローラ４０に係合し、リンク３７が回転体３９を駆動カム５のノーズ部５ｂから所定角度θ３離れた位相で等半径部５ａに接触させ（接点位置Ｐ３）、揺動カム３２のカム面３３がベース部３３ａにてベースローラ１０に係合している。このため、駆動カム５の等半径部５ａが回転体３９に係合している期間中は、揺動カム３２及びロッカアーム７が共に静止し、バルブ４が閉鎖位置に保持される。   Next, the operation of the variable valve mechanism 31 will be described with reference to FIGS. FIG. 7 shows the operation when the valve 4 is opened and closed with the minimum lift amount. At this time, as shown in FIG. 7A, the variable cam 35 is engaged with the roller 40 at the equal radius portion 35a, and the link 37 separates the rotating body 39 from the nose portion 5b of the drive cam 5 by a predetermined angle θ3. The cam surface 33 of the swing cam 32 is engaged with the base roller 10 at the base portion 33a. For this reason, during the period in which the constant radius portion 5a of the drive cam 5 is engaged with the rotating body 39, both the swing cam 32 and the rocker arm 7 are stationary, and the valve 4 is held in the closed position.

図７（ｂ）に示すように、駆動カム５のノーズ部５ｂが回転体３９に接触すると、リンク３７が揺動カム３２を左方へ揺動する。このとき、揺動カム３２は比較的小さな角度で揺動し、カム面３３のリフト部３３ｂがベースローラ１０に浅く係合する。従って、ロッカアーム７が僅かに揺動し、バルブ４が最小のリフト量（Ｌｍｉｎ．）で開放されるとともに、バルブ４の作用角が最小化される。   As shown in FIG. 7B, when the nose portion 5b of the drive cam 5 contacts the rotating body 39, the link 37 swings the swing cam 32 to the left. At this time, the swing cam 32 swings at a relatively small angle, and the lift portion 33b of the cam surface 33 engages with the base roller 10 shallowly. Therefore, the rocker arm 7 swings slightly, the valve 4 is opened with the minimum lift amount (Lmin.), And the working angle of the valve 4 is minimized.

図８は吸気バルブ４を最大のリフト量で開閉するときの作用を示す。このときは、図８（ａ）に示すように、可変カム３５がノーズ部３５ｂにてローラ４０に係合し、リンク３７が回転体３９を駆動カム５のノーズ部５ｂから所定角度θ４（θ４＞θ３）離れた位相で等半径部５ａに接触させる（接点位置Ｐ４）。しかし、接点位置が変化しても、揺動カム３２はベース部３３ａの終端にてベースローラ１０に係合し、ベース部３３ａが揺動カム３２の揺動中心と同心であることから、駆動カム５の等半径部５ａが回転体２１に係合する期間中は、図７（ａ）と同様、バルブ４が閉鎖位置に保持される。   FIG. 8 shows the operation when the intake valve 4 is opened and closed with the maximum lift amount. At this time, as shown in FIG. 8A, the variable cam 35 is engaged with the roller 40 at the nose portion 35b, and the link 37 moves the rotating body 39 from the nose portion 5b of the drive cam 5 to a predetermined angle θ4 (θ4). > Θ3) The constant radius portion 5a is brought into contact with a phase separated from each other (contact point position P4). However, even if the contact position changes, the swing cam 32 is engaged with the base roller 10 at the end of the base portion 33a, and the base portion 33a is concentric with the swing center of the swing cam 32. During the period in which the equiradius portion 5a of the cam 5 is engaged with the rotating body 21, the valve 4 is held in the closed position as in FIG.

図８（ｂ）に示すように、駆動カム５のノーズ部５ｂが回転体３９に接触すると、リンク３７が揺動カム１５を左方へ揺動する。このときは、可変カム３５がローラ４０を駆動カム５側へ持ち上げているので、揺動カム３２が大きな角度で揺動し、カム面３３のリフト部３３ｂがベースローラ１０に深く係合する。このため、ロッカアーム７が大きな角度で揺動し、バルブ４が最大のリフト量（Ｌｍａｘ．）で開放されるとともに、バルブ４の作用角が最大化される。従って、回転体３９と駆動カム５との接点位置をＰ３〜Ｐ４の範囲で変更することにより、バルブ４のリフト量と作用角を任意の中間値に制御できる。   As shown in FIG. 8B, when the nose portion 5b of the drive cam 5 contacts the rotating body 39, the link 37 swings the swing cam 15 to the left. At this time, since the variable cam 35 lifts the roller 40 toward the drive cam 5, the swing cam 32 swings at a large angle, and the lift portion 33 b of the cam surface 33 engages with the base roller 10 deeply. For this reason, the rocker arm 7 swings at a large angle, the valve 4 is opened with the maximum lift amount (Lmax.), And the operating angle of the valve 4 is maximized. Therefore, the lift amount and the operating angle of the valve 4 can be controlled to an arbitrary intermediate value by changing the contact position between the rotating body 39 and the drive cam 5 in the range of P3 to P4.

また、実施例２の可変動弁機構３１によれば、回転体３９をリンク３７の先端に設け、リンク３７の基端を揺動カム３２に連結したので、駆動カム５の動力を一本のリンク３７で揺動カム３２に伝えることができ、駆動カム５からロッカアーム７までの動力伝達経路をリンク３７と揺動カム３２の二部品で簡単に構成できる。特に、揺動カム３２を上下に長く形成し、その上端をカムシャフト２に支持し、下端にカム面３３を設け、リンク３７の中間部に位置するローラ４０を可変カム３５に接触させたので、一本のリンク３７を用いて揺動カム３２を大きな角度で揺動できるという利点もある。   Further, according to the variable valve mechanism 31 of the second embodiment, the rotating body 39 is provided at the distal end of the link 37, and the base end of the link 37 is connected to the swing cam 32. The link 37 can be transmitted to the swing cam 32, and the power transmission path from the drive cam 5 to the rocker arm 7 can be easily configured with two parts, the link 37 and the swing cam 32. In particular, the swing cam 32 is formed to be long in the vertical direction, the upper end thereof is supported by the camshaft 2, the cam surface 33 is provided at the lower end, and the roller 40 positioned at the intermediate portion of the link 37 is brought into contact with the variable cam 35. There is also an advantage that the swing cam 32 can be swung at a large angle by using a single link 37.

本発明の実施例１を示す可変動弁機構の立面図である。It is an elevation view of a variable valve mechanism showing Example 1 of the present invention. 該可変動弁機構において揺動カム、可変カム、可変アーム及びリンクの組付構造を示す斜視図である。It is a perspective view which shows the assembly structure of a rocking cam, a variable cam, a variable arm, and a link in this variable valve mechanism. 該可変動弁機構においてバルブリフト量を最小化するときの作用を示す機構図である。It is a mechanism figure which shows an effect | action when the valve lift amount is minimized in this variable valve mechanism. 該可変動弁機構においてバルブリフト量を最大化するときの作用を示す機構図である。It is a mechanism figure which shows an effect | action when maximizing the valve lift amount in this variable valve mechanism. バルブリフト量と作用角の関係を示す特性図である。It is a characteristic view which shows the relationship between a valve lift amount and a working angle. 本発明の実施例２を示す可変動弁機構の立面図である。It is an elevation view of a variable valve mechanism showing a second embodiment of the present invention. 該可変動弁機構においてバルブリフト量を最小化するときの作用を示す機構図である。It is a mechanism figure which shows an effect | action when the valve lift amount is minimized in this variable valve mechanism. 該可変動弁機構においてバルブリフト量を最大化するときの作用を示す機構図である。It is a mechanism figure which shows an effect | action when maximizing the valve lift amount in this variable valve mechanism. 従来の可変動弁機構を示す断面図である。It is sectional drawing which shows the conventional variable valve mechanism.

符号の説明Explanation of symbols

１ 可変動弁機構（実施例１）
２ カムシャフト
４ バルブ
５ 駆動カム
７ ロッカアーム
１２ アクチュエータ
１４ 可変カム
１５ 揺動カム
１６ カム面
１８ リンク
１９ 可変アーム
２１ 回転体
３１ 可変動弁機構（実施例２）
３２ 揺動カム
３３ カム面
３５ 可変カム
３７ リンク
３９ 回転体 1 Variable valve mechanism (Example 1)
2 Camshaft 4 Valve 5 Drive Cam 7 Rocker Arm 12 Actuator 14 Variable Cam 15 Oscillating Cam 16 Cam Surface 18 Link 19 Variable Arm 21 Rotating Body 31 Variable Valve Mechanism (Embodiment 2)
32 oscillating cam 33 cam surface 35 variable cam 37 link 39 rotating body

Claims (1)

駆動カムを備えたカムシャフトと、バルブを開閉する動弁部材と、動弁部材に係合するカム面を備えた揺動カムと、駆動カムの動力を揺動カムに伝えるリンクと、リンクを駆動するアクチュエータを備えた可変手段とからなり、前記リンクの基端を揺動カムに連結し、リンクの先端に駆動カムと接触する回転体を設け、前記可変手段に回転体と駆動カムとの接点位置を変更する可変カムを設けたことを特徴とする可変動弁機構。   A camshaft having a drive cam; a valve member for opening and closing a valve; a swing cam having a cam surface engaged with the valve member; a link for transmitting drive cam power to the swing cam; A variable means having an actuator for driving, the base end of the link is connected to a swing cam, a rotating body that contacts the driving cam is provided at the tip of the link, and the variable means includes a rotating body and a driving cam. A variable valve mechanism comprising a variable cam for changing a contact position.
JP2005372040A 2005-12-26 2005-12-26 Variable valve train Pending JP2007170333A (en)

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