JP4546427B2 - Variable valve mechanism for internal combustion engine - Google Patents

Variable valve mechanism for internal combustion engine Download PDF

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Publication number
JP4546427B2
JP4546427B2 JP2006197254A JP2006197254A JP4546427B2 JP 4546427 B2 JP4546427 B2 JP 4546427B2 JP 2006197254 A JP2006197254 A JP 2006197254A JP 2006197254 A JP2006197254 A JP 2006197254A JP 4546427 B2 JP4546427 B2 JP 4546427B2
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cam
control arm
valve
arm
internal combustion
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JP2006197254A
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JP2008025418A (en
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明之 米川
雅彦 田代
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP2006197254A priority Critical patent/JP4546427B2/en
Priority to CA002555638A priority patent/CA2555638C/en
Priority to US11/499,872 priority patent/US7406932B2/en
Priority to DE602006020981T priority patent/DE602006020981D1/en
Priority to EP07014214A priority patent/EP1843014B1/en
Priority to DE602006020844T priority patent/DE602006020844D1/en
Priority to EP07014213A priority patent/EP1852577B1/en
Priority to DE602006020212T priority patent/DE602006020212D1/en
Priority to EP06016577A priority patent/EP1754865B1/en
Priority to EP07014217A priority patent/EP1843015B8/en
Priority to DE602006021537T priority patent/DE602006021537D1/en
Priority to MXPA06009233A priority patent/MXPA06009233A/en
Priority to US11/808,723 priority patent/US7363895B2/en
Priority to US11/808,724 priority patent/US7404385B2/en
Priority to US11/808,722 priority patent/US7392773B2/en
Publication of JP2008025418A publication Critical patent/JP2008025418A/en
Application granted granted Critical
Publication of JP4546427B2 publication Critical patent/JP4546427B2/en
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Description

本発明は、コントロールアームにサブカムおよびロッカーアームを支持し、動弁カムの駆動力をサブカムおよびロッカーアームを介して機関弁に伝達する際に、コントロールアームを支軸部まわりに揺動させることで機関弁の少なくともバルブリフトを可変とした内燃機関の可変動弁機構に関する。   The present invention supports the sub cam and the rocker arm on the control arm, and swings the control arm around the support shaft when transmitting the driving force of the valve cam to the engine valve via the sub cam and the rocker arm. The present invention relates to a variable valve mechanism for an internal combustion engine in which at least a valve lift of the engine valve is variable.

かかる内燃機関の可変動弁機構は、本出願人が特願２００５−１３２５９９号により既に提案している。   Such a variable valve mechanism for an internal combustion engine has already been proposed by the present applicant in Japanese Patent Application No. 2005-132599.

この内燃機関の可変動弁機構のコントロールアーム１９は、互いに平行に配置された一対のウエブ（側壁部）１９ａ，１９ａと、両ウエブ１９ａ，１９ａの一端間を連結する連結部１９ｃ（端壁部）と備えて全体としてＵ字状に形成されており、両ウエブ１９ａ，１９ａにおける連結部１９ｃと反対側の端部から外向きに突出する一対の軸部１９ｂ，１９ｂが機関本体に揺動自在に枢支され、両ウエブ１９ａ，１９ａ間にサブカムおよび一対のロッカーアームが揺動自在に枢支される。   The control arm 19 of the variable valve mechanism of the internal combustion engine includes a pair of webs (side walls) 19a and 19a arranged in parallel to each other, and a connecting portion 19c (end wall portion) for connecting between one ends of the webs 19a and 19a. And a pair of shafts 19b, 19b projecting outward from the ends of the webs 19a, 19a opposite to the connecting portion 19c are swingable to the engine body. A sub cam and a pair of rocker arms are pivotally supported between the webs 19a and 19a.

ところで、上記従来の内燃機関の可変動弁機構のコントロールアームは、端壁部と反対側の端部がＵ字状に開放しているために剛性が充分ではなく、そのコントロールアームに動弁カムの駆動力がサブカムを介して作用し、かつ機関弁の弁ばねの弾発力および油圧タペットの推力がロッカーアームを介して作用することで撓み変形し、バルブリフトの制御精度や制御応答性が低下する可能性があった。特に、コントロールアームとサブカムとの間に該サブカムを動弁カムに向けて付勢する付勢手段を設けた場合や、機関本体とコントロールアームとの間に該コントロールアームをコントロールシャフトのコントロールカムに向けて付勢する付勢手段を設けた場合には、コントロールアームに加わる荷重が更に増加して撓み変形が大きくなることが懸念される。   By the way, the control arm of the variable valve mechanism of the conventional internal combustion engine is not sufficiently rigid because the end opposite to the end wall is opened in a U-shape, and the control cam has no valve cam. The driving force of the engine acts through the sub cam, and the elastic force of the valve spring of the engine valve and the thrust of the hydraulic tappet act through the rocker arm, resulting in bending deformation, and the control accuracy and control responsiveness of the valve lift are improved. There was a possibility of decline. In particular, when a biasing means for biasing the sub cam toward the valve cam is provided between the control arm and the sub cam, or the control arm is used as a control cam of the control shaft between the engine body and the control arm. When the biasing means for biasing toward is provided, there is a concern that the load applied to the control arm is further increased and the bending deformation is increased.

本発明は前述の事情に鑑みてなされたもので、内燃機関の可変動弁機構のコントロールアームの剛性を増加させてバルブリフトの制御精度や制御応答性を高めることを目的とする。   The present invention has been made in view of the above circumstances, and an object of the present invention is to increase the control accuracy and control responsiveness of a valve lift by increasing the rigidity of a control arm of a variable valve mechanism of an internal combustion engine.

上記目的を達成するために、請求項１に記載された発明によれば、一対の側壁部にそれぞれ設けた支軸部により機関本体に揺動自在に支持されるコントロールアームと、コントロールアームに揺動自在に支持されて機関弁に当接するロッカーアームと、コントロールアームに揺動自在に支持され、動弁カムにより駆動されてロッカーアームを駆動するサブカムとを備え、コントロールアームの一対の側壁部を一対の支軸部の位置で連結壁部により相互に連結し、コントロールアームをアクチュエータで支軸部まわりに揺動させることで機関弁の少なくともバルブリフトを変更可能な内燃機関の可変動弁機構であって、サブカムには複数のロッカーアームに当接する複数のカム面が設けられ、該複数のカム面の間にサブカムを動弁カム側に付勢する付勢手段を配置し、該付勢手段を連結壁部に支持したことを特徴とする内燃機関の可変動弁機構が提案される。 In order to achieve the above object, according to the first aspect of the present invention, there is provided a control arm that is swingably supported by the engine body by the support shaft portions provided on the pair of side wall portions, and a control arm that swings. and movably to the support has been the engine valve abutting the rocker arm, is swingably supported control arm is driven by the valve operating cam and a sub cam for driving the rocker arm, a pair of side wall portions of the control arm This is a variable valve mechanism for an internal combustion engine that can be connected to each other by a connecting wall at the position of a pair of support shafts, and at least the valve lift of the engine valve can be changed by swinging the control arm around the support shaft by an actuator. there, a plurality of cam surfaces in contact is provided in a plurality of the rocker arms in the sub-cam, urges the sub cam between the cam surfaces of the plurality of the valve operating cam side Place a biasing means that, variable valve actuation mechanism for an internal combustion engine, characterized in that supporting the biasing means to the connecting wall portion is proposed.

また請求項２に記載された発明によれば、請求項１の構成に加えて、サブカムおよび動弁カムの当接部を通って気筒列線方向に垂直な面内に付勢手段を配置したことを特徴とする内燃機関の可変動弁機構が提案される。 According to the second aspect of the present invention, in addition to the configuration of the first aspect, the urging means is disposed in a plane perpendicular to the cylinder row line direction through the contact portions of the sub cam and the valve cam. A variable valve mechanism for an internal combustion engine is proposed.

また請求項３に記載された発明によれば、請求項２の構成に加えて、コントロールアームには複数のロッカーアーム間を仕切る隔壁部が設けられ、該隔壁部と連結壁部との連結部に付勢手段を支持したことを特徴とする内燃機関の可変動弁機構が提案される。 According to the invention described in claim 3 , in addition to the configuration of claim 2 , the control arm is provided with a partition wall partitioning the plurality of rocker arms, and the connection part between the partition wall part and the connection wall part A variable valve mechanism for an internal combustion engine characterized by supporting an urging means is proposed.

尚、実施の形態のシリンダヘッド１１は本発明の機関本体に対応し、実施の形態の吸気弁１２は本発明の機関弁に対応し、実施の形態のローラ４１は本発明のサブカムおよび動弁カムの当接部に対応する。   The cylinder head 11 of the embodiment corresponds to the engine body of the present invention, the intake valve 12 of the embodiment corresponds to the engine valve of the present invention, and the roller 41 of the embodiment includes the sub-cam and the valve operating valve of the present invention. Corresponds to the cam contact part.

請求項１の構成によれば、ロッカーアームおよびサブカムを揺動自在に支持して支軸部まわりに揺動するコントロールアームの一対の側壁部を、前記支軸部の位置で連結壁部により相互に連結したことにより、コントロールアームを四角枠状の構成して剛性を高めることができる。これにより、コントロールアームがそれに直接に、あるいはロッカーアームやサブカムを介して加えられる荷重で撓み変形するのを抑制し、機関弁のバルブリフトの制御精度および制御応答性の向上を図ることができる。特に、サブカムを動弁カム側に付勢する付勢手段を、複数のロッカーアームを駆動すべくサブカムに設けた複数のカム面の間に形成されるデッドスペースを利用して配置したので、可変動弁機構全体をコンパクト化することができる。しかもコントロールアームの一対の側壁部を支軸部の位置で連結する連結壁部に付勢手段を支持したので、付勢手段の付勢力の反力を連結壁部から一対の側壁部に伝達してコントロールアームの撓みを抑制するとともに、付勢手段を支持するための特別の部材を不要にして部品点数の削減および可変動弁機構の更なるコンパクト化を図ることができる。 According to the configuration of the first aspect, the pair of side wall portions of the control arm that swingably supports the rocker arm and the sub cam and swings around the support shaft portion are connected to each other by the connecting wall portion at the position of the support shaft portion. By connecting to the control arm, the control arm can be formed in a square frame shape to increase the rigidity. As a result, the control arm can be prevented from being bent and deformed by a load applied directly or via a rocker arm or a sub cam, and the control accuracy and control response of the valve lift of the engine valve can be improved. In particular, the urging means for urging the sub cam toward the valve cam is arranged using a dead space formed between a plurality of cam surfaces provided on the sub cam to drive a plurality of rocker arms. The entire variable valve mechanism can be made compact. Moreover, since the urging means is supported by the connecting wall portion that connects the pair of side wall portions of the control arm at the position of the support shaft portion, the reaction force of the urging force of the urging means is transmitted from the connecting wall portion to the pair of side wall portions. Thus, it is possible to suppress the bending of the control arm and eliminate the need for a special member for supporting the urging means, thereby reducing the number of parts and further reducing the size of the variable valve mechanism.

また請求項２の構成によれば、サブカムおよび動弁カムの当接部を通って気筒列線方向に垂直な面内に付勢手段を配置したので、付勢手段の付勢力の反力がコントロールアームを倒す方向に作用しなくなって該コントロールアームの撓みが最小限に抑えられるだけでなく、付勢手段の付勢力を最小限のロスでサブカムおよび動弁カムに伝達することができる。 According to the second aspect of the present invention, since the urging means is arranged in a plane perpendicular to the cylinder row line direction through the contact portions of the sub cam and the valve cam, the reaction force of the urging force of the urging means is reduced. Not only does the control arm not act in the direction of tilting, the deflection of the control arm is minimized, but also the urging force of the urging means can be transmitted to the sub cam and valve cam with minimal loss.

また請求項３の構成によれば、コントロールアームに複数のロッカーアーム間を仕切る隔壁部を設け、この隔壁部と連結壁部とを連結する剛性の高い連結部に付勢手段を支持したので、付勢手段の付勢力の反力によるコントロールアームの撓みを一層効果的に抑制することができる。 According to the configuration of claim 3, the partition wall portion that partitions the plurality of rocker arms is provided in the control arm, and the biasing means is supported by the highly rigid connection portion that connects the partition wall portion and the connection wall portion. The deflection of the control arm due to the reaction force of the urging force of the urging means can be more effectively suppressed.

以下、本発明の実施の形態を添付の図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

図１〜図１０は本発明の実施の形態を示すもので、図１は内燃機関の要部縦断側面図、図２は図１の２−２線矢視図、図３は高バルブリフト状態での図２の３−３線断面図、図４は高バルブリフト状態での図２の４−４線断面図、図５は低バルブリフト状態での図４に対応する断面図、図６は可変動弁機構を一方向から見た斜視図、図７は可変動弁機構を他方向から見た斜視図、図８はコントロールアームを一方向から見た斜視図、図９はコントロールアームを他方向から見た斜視図、図１０は図８および図９の１０方向矢視図である。   1 to 10 show an embodiment of the present invention. FIG. 1 is a longitudinal side view of a main part of an internal combustion engine, FIG. 2 is a view taken along line 2-2 in FIG. 1, and FIG. 2 is a sectional view taken along line 3-3 in FIG. 2, FIG. 4 is a sectional view taken along line 4-4 in FIG. 2 in a high valve lift state, and FIG. 5 is a sectional view corresponding to FIG. Is a perspective view of the variable valve mechanism as seen from one direction, FIG. 7 is a perspective view of the variable valve mechanism as seen from the other direction, FIG. 8 is a perspective view of the control arm as seen from one direction, and FIG. FIG. 10 is a perspective view seen from the other direction, and FIG. 10 is a view taken in the direction of the arrow 10 in FIGS.

図１および図２に示すように、内燃機関のシリンダヘッド１１には各気筒毎に一対の吸気弁１２，１２が開閉可能に配設されており、それらの吸気弁１２，１２を開閉駆動する可変動弁機構１３は、動弁カム１４が設けられたカムシャフト１５と、シリンダヘッド１１に設けた一対の支持壁１１ａ，１１ａの軸孔１１ｂ，１１ｂにそれぞれ支軸部１６，１６を介して揺動自在に支持されたコントロールアーム１７と、コントロールアーム１７を揺動させるコントロールカム１８が設けられたコントロールシャフト１９と、コントロールアーム１７に可動支軸２０を介して揺動可能に支持されるとともに動弁カム１４に従動して揺動するサブカム２１と、吸気弁１２，１２にそれぞれ個別に連動、連結されるとともにサブカム２１にそれぞれ従動する一対のロッカーアーム２２，２２とを備えており、前記可動支軸２０を変位させることで吸気弁１２，１２のバルブリフトを含む作動特性を変化させることができる。   As shown in FIGS. 1 and 2, a pair of intake valves 12, 12 is provided in the cylinder head 11 of the internal combustion engine so as to be opened and closed for each cylinder, and the intake valves 12, 12 are driven to open and close. The variable valve mechanism 13 includes a camshaft 15 provided with a valve cam 14 and shaft holes 11b and 11b of a pair of support walls 11a and 11a provided in the cylinder head 11 via support shafts 16 and 16, respectively. The control arm 17 is supported in a swingable manner, the control shaft 19 is provided with a control cam 18 for swinging the control arm 17, and is supported by the control arm 17 so as to be swingable through a movable support shaft 20. The sub cam 21 that swings following the valve cam 14 and the intake valves 12 and 12 are individually linked and connected to the sub cam 21 and the sub cam 21 respectively. And a pair of rocker arms 22 and 22, it is possible to change the operating characteristics including the valve lift of the intake valves 12, 12 by displacing the movable support shaft 20.

吸気弁１２，１２のステム１２ａ，１２ａはシリンダヘッド１１に配設されたガイド筒２３，２３に摺動自在に嵌合しており、ステム１２ａ，１２ａの上端に設けられたリテーナ２４，２４と、シリンダヘッド１１に当接するリテーナ２５，２５との間に介設された弁ばね２６，２６とにより、吸気弁１２，１２は閉弁方向に付勢される。   The stems 12a and 12a of the intake valves 12 and 12 are slidably fitted into guide cylinders 23 and 23 disposed in the cylinder head 11, and retainers 24 and 24 provided at the upper ends of the stems 12a and 12a, The intake valves 12 and 12 are urged in the valve closing direction by the valve springs 26 and 26 interposed between the retainers 25 and 25 in contact with the cylinder head 11.

次に、図８〜図１０に基づいてコントロールアーム１７の形状を説明する。   Next, the shape of the control arm 17 will be described with reference to FIGS.

コントロールアーム１７は単一の部材で構成されるもので、前記一対の支軸部１６，１６がそれぞれ設けられた一対の板状の側壁部２７，２７を備える。これらの側壁部２７，２７は所定の間隔を存して平行に配置されており、両側壁部２７，２７は一端部間が支軸部１６，１６と平行に延びる端壁部２８で相互に連結されるとともに、他端部間が支軸部１６，１６と平行に延びる連結壁部２９で相互に連結される。即ち、図１０の方向に見て、コントロールアーム１７は一対の側壁部２７，２７と端壁部２８と連結壁部２９とにより四角い枠状に形成されており、端壁部２８および連結壁部２９の補強効果でコントロールアーム１７の剛性が高められる。特に、連結壁部２９がコントロールアーム１７の剛性向上に効果的に寄与するように、その連結壁部２９が設けられる位置はコントロールアーム１７に最も大きな荷重が加わる支軸部１６，１６の近傍とされる。   The control arm 17 is composed of a single member and includes a pair of plate-like side wall portions 27 and 27 provided with the pair of support shaft portions 16 and 16, respectively. These side wall portions 27 and 27 are arranged in parallel at a predetermined interval, and both side wall portions 27 and 27 are mutually connected by end wall portions 28 extending between the one end portions in parallel with the support shaft portions 16 and 16. The other end portions are connected to each other by a connecting wall portion 29 extending in parallel with the support shaft portions 16 and 16. That is, when viewed in the direction of FIG. 10, the control arm 17 is formed in a square frame shape by a pair of side wall portions 27, 27, an end wall portion 28, and a connecting wall portion 29. The rigidity of the control arm 17 is increased by the reinforcing effect of 29. In particular, the position where the connecting wall 29 is provided is in the vicinity of the support shafts 16, 16 where the largest load is applied to the control arm 17 so that the connecting wall 29 effectively contributes to improving the rigidity of the control arm 17. Is done.

コントロールアーム１７の側壁部２７，２７には、前記支軸部１６，１６が一体に突設される以外に、前記可動支軸２０が圧入される軸孔２７ａ，２７ａが形成される。コントロールアーム１７の端壁部２８および連結壁部２９は隔壁部３０により一体に連結されており、この連結壁部２９の補強効果によりコントロールアーム１７の剛性が一層高められる。   The side walls 27 and 27 of the control arm 17 are formed with shaft holes 27a and 27a into which the movable support shaft 20 is press-fitted, in addition to the support shafts 16 and 16 projecting integrally. The end wall portion 28 and the connecting wall portion 29 of the control arm 17 are integrally connected by a partition wall portion 30, and the rigidity of the control arm 17 is further enhanced by the reinforcing effect of the connecting wall portion 29.

一対の側壁部２７，２７および隔壁部３０は相互に平行に延び、それらの間に二つのロッカーアーム収容孔１７ａ，１７ａが形成される。隔壁部３０の端壁部２８寄りの位置には、一対のローラ支持部３０ａ，３０ａが上向きに立ち上がっており、これらのローラ支持部３０ａ，３０ａには後述するローラ軸４７が圧入される軸孔３０ｂ，３０ｂが形成される。一対のローラ支持部３０ａ，３０ａの間にはローラ収容凹部３０ｃが形成されており、このローラ収容凹部３０ｃの底壁の一部は前記端壁部２８により構成される。   The pair of side wall portions 27 and 27 and the partition wall portion 30 extend in parallel with each other, and two rocker arm accommodation holes 17a and 17a are formed between them. A pair of roller support portions 30a and 30a rises upward at a position near the end wall portion 28 of the partition wall portion 30, and a shaft hole into which a roller shaft 47 described later is press-fitted into these roller support portions 30a and 30a. 30b and 30b are formed. A roller accommodating recess 30c is formed between the pair of roller support portions 30a, 30a, and a part of the bottom wall of the roller accommodating recess 30c is constituted by the end wall portion 28.

端壁部２８には、後述する油圧タペット３１，３１が装着される一対の油圧タペット取付孔２８ａ，２８ａが、ロッカーアーム収容孔１７ａ，１７ａに臨むように形成される。端壁部２８は、油圧タペット取付孔２８ａ，２８ａに連通するオイル排出孔２８ｂ，２８ｂが形成されており、油圧タペット３１，３１から排出されたオイルはオイル排出孔２８ｂ，２８ｂを介して下方に落下する。また連結壁部２９には、後述する付勢手段４２が装着される付勢手段取付孔２９ａが形成される。   A pair of hydraulic tappet attachment holes 28a and 28a to which hydraulic tappets 31 and 31 described later are attached are formed in the end wall portion 28 so as to face the rocker arm accommodation holes 17a and 17a. The end wall portion 28 is formed with oil discharge holes 28b and 28b communicating with the hydraulic tappet mounting holes 28a and 28a, and the oil discharged from the hydraulic tappets 31 and 31 is downward through the oil discharge holes 28b and 28b. Fall. The connecting wall portion 29 is formed with a biasing means mounting hole 29a to which a biasing means 42 described later is mounted.

図２〜図７から明らかなように、ロッカーアーム２２，２２はロッカーシャフトを持たないタイプのもので、その一端部に形成した凹部２２ａが前記端壁部２８の油圧タペット取付孔２８ａに装着した油圧タペット３１の先端の球面軸受け３１ａに揺動可能に支持され、その他端部で吸気弁１２を駆動する。即ち、ロッカーアーム２２の他端には吸気弁１２のステム１２ａの上端に当接する当接部材３２が摺動自在に支持されており、その当接部材３２の位置をアジャストスクリュー３３およびロックナット３４で調整することで、吸気弁１２の着座状態を調整可能である。ロッカーアーム２２の中間部に形成したローラ収容孔２２ｂを架橋するローラ軸３５にボールベアリング３６を介してローラ３７が回転自在に支持される。   As apparent from FIGS. 2 to 7, the rocker arms 22 and 22 are of a type having no rocker shaft, and a recess 22a formed at one end thereof is mounted in the hydraulic tappet mounting hole 28a of the end wall 28. The hydraulic tappet 31 is swingably supported by the spherical bearing 31a at the tip, and the intake valve 12 is driven at the other end. That is, a contact member 32 that contacts the upper end of the stem 12a of the intake valve 12 is slidably supported at the other end of the rocker arm 22, and the position of the contact member 32 is adjusted with an adjustment screw 33 and a lock nut 34. The seating state of the intake valve 12 can be adjusted by adjusting at. A roller 37 is rotatably supported via a ball bearing 36 on a roller shaft 35 that bridges a roller accommodation hole 22b formed in an intermediate portion of the rocker arm 22.

ロッカーアーム２２，２２は、コントロールアーム１７の一対の側壁部２７，２７および隔壁部３０に挟まれたロッカーアーム収容孔１７ａ，１７ａに嵌合するように収容される。ロッカーシャフトを持たないロッカーアーム２２は、一端が油圧タペット３１に当接し、他端が吸気バルブ１２のステム１２ａに当接し、中央のローラ３７がサブカム２１に当接して支持されるだけなので、その姿勢が不安定で倒れ易いために組付作業が困難になることが懸念される。しかしながら、本実施の形態では、ロッカーアーム２２，２２が側壁部２７，２７および隔壁部３０に両側を挟まれて倒れを防止されることで、その組付作業が容易になる。   The rocker arms 22 and 22 are accommodated so as to be fitted into rocker arm accommodation holes 17 a and 17 a sandwiched between the pair of side wall portions 27 and 27 and the partition wall portion 30 of the control arm 17. The rocker arm 22 having no rocker shaft has only one end abutting against the hydraulic tappet 31, the other end abutting against the stem 12 a of the intake valve 12, and the central roller 37 abutting against the sub cam 21. There is a concern that the assembly work becomes difficult because the posture is unstable and easy to fall. However, in this embodiment, the rocker arms 22 and 22 are sandwiched on both sides by the side walls 27 and 27 and the partition wall 30 to prevent the rocker arms 22 and 22 from falling down, thereby facilitating the assembling work.

コントロールアーム１７の一対の側壁部２７，２７に形成した軸孔２７ａ，２７ａに支軸３８が圧入されており、この支軸３８にサブカム２１が揺動自在に支持される。サブカム２１の軸方向中央部から突出する第１アーム２１ａにローラ軸３９およびボールベアリング４０を介してローラ４１が支持されており、このローラ４１がカムシャフト１５に設けた動弁カム１４に当接する。またサブカム２１の軸方向両端部から突出する一対の第２アーム２１ｂ，２１ｂにカム面２１ｃ，２１ｃが形成されており、これらのカム面２１ｃ，２１ｃに前記ロッカーアーム２２，２２のローラ３７，３７が当接する。   A support shaft 38 is press-fitted into shaft holes 27a, 27a formed in the pair of side wall portions 27, 27 of the control arm 17, and the sub cam 21 is supported by the support shaft 38 so as to be swingable. A roller 41 is supported via a roller shaft 39 and a ball bearing 40 on a first arm 21 a that protrudes from the central portion in the axial direction of the sub cam 21, and this roller 41 comes into contact with the valve cam 14 provided on the cam shaft 15. . Cam surfaces 21c and 21c are formed on a pair of second arms 21b and 21b protruding from both axial ends of the sub cam 21, and the rollers 37 and 37 of the rocker arms 22 and 22 are formed on these cam surfaces 21c and 21c. Abut.

サブカム２１のローラ４１を動弁カム１４に当接させる付勢力を発生する付勢手段４２が、コントロールアーム１７の連結壁部２９に形成した付勢手段取付孔２９ａに装着される。付勢手段４２は、連結壁部２９の付勢手段取付孔２９ａに圧入されるガイド筒４３と、ガイド筒４３に摺動自在に嵌合する押圧部材４４と、押圧部材４４の上端に設けられてサブカム２１の第１アーム２１ａの下面に当接する当接部４５と、ガイド筒４３および当接部４５間に縮設されて押圧部材４４を突出方向に付勢するコイルスプリング４６とで構成される。   A biasing means 42 that generates a biasing force that causes the roller 41 of the sub cam 21 to contact the valve cam 14 is mounted in a biasing means mounting hole 29 a formed in the connecting wall portion 29 of the control arm 17. The urging means 42 is provided at the upper end of the pressing member 44, a guide cylinder 43 that is press-fitted into the urging means attachment hole 29 a of the connecting wall portion 29, a pressing member 44 that is slidably fitted into the guide cylinder 43. The contact portion 45 that contacts the lower surface of the first arm 21a of the sub cam 21 and the coil spring 46 that is contracted between the guide tube 43 and the contact portion 45 and biases the pressing member 44 in the protruding direction. The

コントロールアーム１７のうち、連結壁部２９と隔壁部３０とが連結される部分は剛性の高い部分であり、この部分に付勢手段４２を支持したことにより、付勢手段４２がサブカム２１を付勢する付勢力の反力によるコントロールアーム１７の撓み変形を最小限に抑えることができる。また付勢手段４２、サブカム２１のローラ４１および動弁カム１４は、気筒列線に直交する同一平面内（図４の紙面内）に配置されている。この配置により、動弁カム１４からの荷重および付勢手段４２からの荷重がコントロールアーム１７を倒す方向（図４の紙面に対して傾く方向）に作用することがなく、これによりコントロールアーム１７の撓み変形を最小限に抑えて吸気弁１２，１２のバルブリフトの制御精度を高めることができる
コントロールアーム１７の隔壁部３０に中央に形成されたローラ収容凹部３０ｃには、ローラ支持部３０ａ，３０ａの軸孔３０ｂ，３０ｂに圧入されたローラ軸４７にボールベアリング４８を介して回転自在に支持されたローラ４９が収容される。ローラ４９を押圧してコントロールアーム１７を支軸部１６，１６まわりに揺動させるべく、電気モータで構成されたアクチュエータ５０で往復回動するコントロールシャフト１９に、インボリュート曲線よりなるカム面を有するコントロールカム１８が設けられる。図３〜図５において、コントロールシャフト１９が時計方向に回動するとコントロールアーム１７が支軸部１６，１６まわりに反時計方向に揺動し、コントロールシャフト１９が反時計方向に回動するとコントロールアーム１７が支軸部１６，１６まわりに時計方向に揺動する。 Of the control arm 17, the portion where the connecting wall portion 29 and the partition wall portion 30 are connected is a highly rigid portion, and since the biasing means 42 is supported on this portion, the biasing means 42 attaches the sub cam 21. The bending deformation of the control arm 17 due to the reaction force of the energizing force can be minimized. Further, the urging means 42, the roller 41 of the sub cam 21 and the valve cam 14 are arranged in the same plane (in the plane of FIG. 4) orthogonal to the cylinder row. With this arrangement, the load from the valve cam 14 and the load from the urging means 42 do not act in the direction in which the control arm 17 is tilted (inclined with respect to the paper surface of FIG. 4). Roller receiving recess 30c formed in the center of the partition wall 30 of the control arm 17 can improve the control accuracy of the valve lift of the intake valves 12, 12 while minimizing the bending deformation. The roller support portions 30a, 30a A roller 49 rotatably supported via a ball bearing 48 is accommodated in a roller shaft 47 press-fitted into the shaft holes 30b, 30b. A control shaft 19 having a cam surface formed of an involute curve on the control shaft 19 reciprocally rotated by an actuator 50 constituted by an electric motor so as to press the roller 49 and swing the control arm 17 around the support shaft portions 16 and 16. A cam 18 is provided. 3 to 5, when the control shaft 19 rotates clockwise, the control arm 17 swings counterclockwise around the support shafts 16 and 16, and when the control shaft 19 rotates counterclockwise, the control arm 19 17 swings around the support shafts 16 and 16 in the clockwise direction.

コントロールアーム１７を時計方向に付勢してローラ４９をコントロールカム１８に当接させるべく、シリンダヘッド１に付勢手段５１が設けられる。付勢手段５１はシリンダヘッド１１に圧入されたガイド筒５２の内部に押圧部材５３を摺動自在に嵌合させ、コイルスプリング５４の弾発力で押圧部材５３をガイド筒５２から突出する方向に付勢したもので、押圧部材５３の上端の球状部５３ａがコントロールアーム１７の端壁部２８の中央下面に当接する。   A biasing means 51 is provided on the cylinder head 1 so as to bias the control arm 17 clockwise and bring the roller 49 into contact with the control cam 18. The urging means 51 slidably fits the pressing member 53 into the guide cylinder 52 press-fitted into the cylinder head 11, and the pressing member 53 protrudes from the guide cylinder 52 by the elastic force of the coil spring 54. The spherical portion 53 a at the upper end of the pressing member 53 comes into contact with the lower center surface of the end wall portion 28 of the control arm 17.

以上のように、コントロールアーム１７の隔壁部３０を利用してローラ４９を支持したので、ローラ４９を支持するための特別の部材が不要になって部品点数の削減および構造の簡素化が可能になる。特に、しかもコントロールアーム１７の隔壁部３０に形成したローラ収容凹部３０ｃにローラ４９を収容したので、ローラ収容凹部３０ｃの空間を利用してローラ４９の装着スペースを確保しながら、ローラ収容凹部３０ｃを設けたことによるコントロールアーム１７の剛性低下を、該ローラ収容凹部３０ｃの底壁を構成する端壁部２８の補強効果で最小限に抑えることができる。   As described above, since the roller 49 is supported using the partition wall portion 30 of the control arm 17, a special member for supporting the roller 49 is not required, and the number of parts can be reduced and the structure can be simplified. Become. In particular, since the roller 49 is housed in the roller housing recess 30c formed in the partition wall 30 of the control arm 17, the roller housing recess 30c is secured while securing the mounting space for the roller 49 using the space of the roller housing recess 30c. The reduction in rigidity of the control arm 17 due to the provision can be minimized by the reinforcing effect of the end wall portion 28 constituting the bottom wall of the roller accommodating recess 30c.

また付勢手段５１でコントロールアーム１７を付勢してローラ４９をコントロールカム１８に当接させるので、ローラ４９がコントロールカム１８から浮き上がるのを防止してコントロールアーム１７の挙動を安定させ、吸気弁１２，１２のバルブリフトの制御精度を高めることができる。   Further, since the control arm 17 is urged by the urging means 51 and the roller 49 is brought into contact with the control cam 18, the roller 49 is prevented from being lifted from the control cam 18 to stabilize the behavior of the control arm 17, and the intake valve The control accuracy of the 12 and 12 valve lifts can be increased.

またコントロールアーム１７の端壁部２８と隔壁部３０とを連結する位置、より具体的には端壁部２８に支持した一対の油圧タペット３１，３１に挟まれた位置を、つまりコントロールアーム１７の剛性が高い部分を付勢手段５１で押圧するので、付勢手段５１の押圧力でコントロールアーム１７が撓むのを防止して吸気弁１２，１２のバルブリフトの制御精度を更に高めることができる。   The position where the end wall portion 28 and the partition wall portion 30 of the control arm 17 are connected, more specifically, the position between the pair of hydraulic tappets 31, 31 supported by the end wall portion 28, that is, the position of the control arm 17. Since the portion having high rigidity is pressed by the biasing means 51, the control arm 17 can be prevented from being bent by the pressing force of the biasing means 51, and the control accuracy of the valve lift of the intake valves 12, 12 can be further increased. .

特に、コントロールカム１８と、それが当接するコントロールアーム１７のローラ４９と、ローラ４９がコントロールカム１８に当接する方向にコントロールアーム１７を付勢する付勢手段５１とが、気筒列線に直交する同一平面内（図４の紙面内）に配置されているため、コントロールカム１８からの荷重および付勢手段５１からの荷重がコントロールアーム１７を倒す方向（図４の紙面に対して傾く方向）に作用することがなく、これによりコントロールアーム１７の撓み変形を最小限に抑えて吸気弁１２，１２のバルブリフトの制御精度を高めることができる。   In particular, the control cam 18, the roller 49 of the control arm 17 with which it abuts, and the urging means 51 for urging the control arm 17 in the direction in which the roller 49 abuts against the control cam 18 are orthogonal to the cylinder row line. Since they are arranged in the same plane (within the paper surface of FIG. 4), the load from the control cam 18 and the load from the urging means 51 in the direction of tilting the control arm 17 (the direction inclined with respect to the paper surface of FIG. 4). Therefore, the control accuracy of the valve lifts of the intake valves 12 and 12 can be increased while minimizing the bending deformation of the control arm 17.

また油圧タペット３１，３１の気筒軸線方向下方に付勢手段５１を配置したので、油圧タペット３１，３１から排出されたオイルが端壁部２８のオイル排出孔２８ｂ，２８ｂから下方に落下することで、付勢手段５１を効果的に潤滑することができる。   In addition, since the urging means 51 is disposed below the hydraulic tappets 31, 31 in the cylinder axial direction, the oil discharged from the hydraulic tappets 31, 31 falls downward from the oil discharge holes 28 b, 28 b of the end wall portion 28. The biasing means 51 can be effectively lubricated.

図１から明らかなように、点火プラグ５５の着脱を案内する点火プラグ収容筒５６がシリンダヘッド１１に圧入されており、この点火プラグ収容筒５６と一体に形成された前記ガイド筒５２もシリンダヘッド１１に圧入される。このように、ガイド筒５２を点火プラグ収容筒５６と一体に形成することで、その付勢手段５１の剛性を高めてコントロールアーム１７の挙動を更に安定させることができる。   As is apparent from FIG. 1, a spark plug housing cylinder 56 for guiding the attachment / detachment of the spark plug 55 is press-fitted into the cylinder head 11, and the guide cylinder 52 formed integrally with the spark plug housing cylinder 56 is also a cylinder head. 11 is press-fitted. Thus, by forming the guide cylinder 52 integrally with the spark plug housing cylinder 56, the rigidity of the biasing means 51 can be increased and the behavior of the control arm 17 can be further stabilized.

しかして、コントロールカム１８によってコントロールアーム１７が図３および図４に示す位置に配置されるときには、つまりコントロールカム１８の最高リフト部がローラ４９に当接するときには、可動支軸２０の軸線まわりに揺動するサブカム２１のカム面２１ｃ，２１ｃの先端側（可動支軸２０から遠い側）がロッカーアーム２２，２２のローラ３７，３７に当接してロッカーアーム２２，２２の揺動角が増加することで、吸気弁１２，１２のバルブリフトが最大となる。   Therefore, when the control arm 17 is disposed at the position shown in FIGS. 3 and 4 by the control cam 18, that is, when the highest lift portion of the control cam 18 abuts on the roller 49, the control cam 17 swings around the axis of the movable support shaft 20. The leading end side (the side far from the movable support shaft 20) of the cam surfaces 21c, 21c of the moving sub cam 21 comes into contact with the rollers 37, 37 of the rocker arms 22, 22, and the rocking angle of the rocker arms 22, 22 increases. Thus, the valve lift of the intake valves 12, 12 is maximized.

またコントロールカム１８よってコントロールアーム１７が図５に示す位置にあるときには、つまりコントロールカム１８の最低リフト部がローラ４９に当接するときには、可動支軸２０の軸線まわりに揺動するサブカム２１のカム面２１ｃ，２１ｃの基端側（可動支軸２０に近い側）がロッカーアーム２２，２２のローラ３７，３７に当接してロッカーアーム２２，２２の揺動角が減少することで、吸気弁１２，１２のバルブリフトが最小（ゼロ）となる。   When the control arm 17 is in the position shown in FIG. 5 by the control cam 18, that is, when the lowest lift portion of the control cam 18 abuts on the roller 49, the cam surface of the sub cam 21 that swings around the axis of the movable support shaft 20. The base end side of 21c, 21c (the side close to the movable support shaft 20) abuts on the rollers 37, 37 of the rocker arms 22, 22, and the rocking angle of the rocker arms 22, 22 is reduced. Twelve valve lifts are minimized (zero).

このように、コントロールアーム１７を支軸部１６，１６まわりに揺動させることで吸気弁１２，１２のバルブリフトが変化するのが、コントロールアーム１７の駆動によって動弁カム１４，１４がローラ４１，４１に接触するタイミングも変化することにより、吸気弁１２，１２の開閉タイミングも変化する。   In this way, the valve lift of the intake valves 12, 12 is changed by swinging the control arm 17 around the support shaft portions 16, 16. The valve cams 14, 14 are driven by the rollers 41 by driving the control arm 17. , 41 also changes the timing at which the intake valves 12, 12 are opened and closed.

以上、本発明の実施の形態を説明したが、本発明はその要旨を逸脱しない範囲で種々の設計変更を行うことが可能である。   The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

例えば、実施の形態では機関弁として吸気弁１２，１２を例示したが、本発明の機関弁は排気弁であっても良い。   For example, in the embodiment, the intake valves 12 and 12 are exemplified as the engine valve, but the engine valve of the present invention may be an exhaust valve.

また実施の形態ではコントロールカム１８が当接するコントロールアーム１７のカムフォロアをローラ４９で構成しているが、それをスリッパで構成しても良い。   In the embodiment, the cam follower of the control arm 17 with which the control cam 18 abuts is constituted by the roller 49, but it may be constituted by a slipper.

内燃機関の要部縦断側面図Longitudinal sectional side view of the internal combustion engine 図１の２−２線矢視図2-2 line view of FIG. 高バルブリフト状態での図２の３−３線断面図Sectional view along line 3-3 in FIG. 2 in a high valve lift state 高バルブリフト状態での図２の４−４線断面図Sectional view taken along line 4-4 of FIG. 2 in a high valve lift state 低バルブリフト状態での図４に対応する断面図Sectional view corresponding to FIG. 4 in the low valve lift state 可変動弁機構を一方向から見た斜視図Perspective view of variable valve mechanism from one direction 可変動弁機構を他方向から見た斜視図Perspective view of variable valve mechanism as seen from other direction コントロールアームを一方向から見た斜視図A perspective view of the control arm from one direction コントロールアームを他方向から見た斜視図A perspective view of the control arm as seen from the other direction 図８および図９の１０方向矢視図10 and 10 arrow views of FIGS. 8 and 9

１１ シリンダヘッド（機関本体）
１２ 吸気弁（機関弁）
１４ 動弁カム
１６ 支軸部
１７ コントロールアーム
２１ サブカム
２１ｃ カム面
２２ ロッカーアーム
２７ 側壁部
２９ 連結壁部
３０ 隔壁部
４１ ローラ（サブカムおよび動弁カムの当接部）
４２ 付勢手段
５０ アクチュエータ 11 Cylinder head (engine body)
12 Intake valve (engine valve)
14 Valve cam 16 Support shaft part 17 Control arm 21 Sub cam 21c Cam surface 22 Rocker arm 27 Side wall part 29 Connecting wall part 30 Partition part 41 Roller (contact part of sub cam and valve cam)
42 Biasing means 50 Actuator

Claims (3)

一対の側壁部（２７）にそれぞれ設けた支軸部（１６）により機関本体（１１）に揺動自在に支持されるコントロールアーム（１７）と、
コントロールアーム（１７）に揺動自在に支持されて機関弁（１２）に当接するロッカーアーム（２２）と、
コントロールアーム（１７）に揺動自在に支持され、動弁カム（１４）により駆動されてロッカーアーム（２２）を駆動するサブカム（２１）とを備え、
コントロールアーム（１７）の一対の側壁部（２７）を一対の支軸部（１６）の位置で連結壁部（２９）により相互に連結し、コントロールアーム（１７）をアクチュエータ（５０）で支軸部（１６）まわりに揺動させることで機関弁（１２）の少なくともバルブリフトを変更可能な内燃機関の可変動弁機構であって、
サブカム（２１）には複数のロッカーアーム（２２）に当接する複数のカム面（２１ｃ）が設けられ、該複数のカム面（２１ｃ）の間にサブカム（２１）を動弁カム（１２）側に付勢する付勢手段（４２）を配置し、該付勢手段（４２）を連結壁部（２９）に支持したことを特徴とする内燃機関の可変動弁機構。 A control arm (17) that is swingably supported by the engine body (11) by a support shaft portion (16) provided on each of the pair of side wall portions (27);
A rocker arm (22) that is swingably supported by the control arm (17) and contacts the engine valve (12);
A sub-cam (21) that is swingably supported by the control arm (17) and driven by the valve cam (14) to drive the rocker arm (22);
The pair of side wall portions (27) of the control arm (17) are connected to each other by the connecting wall portion (29) at the position of the pair of support shaft portions (16), and the control arm (17) is supported by the actuator (50). A variable valve mechanism for an internal combustion engine capable of changing at least a valve lift of the engine valve (12) by swinging around a portion (16),
The sub cam (21) is provided with a plurality of cam surfaces (21c) that come into contact with the plurality of rocker arms (22), and the sub cam (21) is placed between the plurality of cam surfaces (21c) on the side of the valve cam (12). A variable valve mechanism for an internal combustion engine, characterized in that an urging means (42) for urging is disposed, and the urging means (42) is supported by a connecting wall (29) . サブカム（２１）および動弁カム（１２）の当接部（４１）を通って気筒列線方向に垂直な面内に付勢手段（４２）を配置したことを特徴とする、請求項１に記載の内燃機関の可変動弁機構。 Characterized in that a biasing means (42) in a plane perpendicular to the cylinder row line direction through sub Bukamu (21) and the contact portion of the valve operating cam (12) to (41), according to claim 1 A variable valve mechanism for an internal combustion engine according to claim 1. コントロールアーム（１７）には複数のロッカーアーム（２２）間を仕切る隔壁部（３０）が設けられ、該隔壁部（３０）と連結壁部（２９）との連結部に付勢手段（４２）を支持したことを特徴とする、請求項２に記載の内燃機関の可変動弁機構。 Co cement roll partition wall partitioning the plurality of rocker arms (22) to the arm (17) (30) is provided biasing means in the connecting portion of the partition wall portion (30) and the connecting wall portion (29) (42 The variable valve mechanism for an internal combustion engine according to claim 2 , wherein:
JP2006197254A 2005-08-15 2006-07-19 Variable valve mechanism for internal combustion engine Expired - Fee Related JP4546427B2 (en)

Priority Applications (15)

Application Number Priority Date Filing Date Title
JP2006197254A JP4546427B2 (en) 2006-07-19 2006-07-19 Variable valve mechanism for internal combustion engine
US11/499,872 US7406932B2 (en) 2005-08-15 2006-08-07 Lift-variable valve-operating system for internal combustion engine
CA002555638A CA2555638C (en) 2005-08-15 2006-08-07 Lift-variable valve-operating system for internal combustion engine
EP07014217A EP1843015B8 (en) 2005-08-15 2006-08-08 Lift-variable valve-operating system for internal combustion engine
DE602006020844T DE602006020844D1 (en) 2005-08-15 2006-08-08 Variable stroke valve train system for an internal combustion engine
EP07014213A EP1852577B1 (en) 2005-08-15 2006-08-08 Lift-variable valve-operating system for internal combustion engine
DE602006020212T DE602006020212D1 (en) 2005-08-15 2006-08-08 Valve actuation system for varying the valve lift of an internal combustion engine
EP06016577A EP1754865B1 (en) 2005-08-15 2006-08-08 Lift-variable valve-operating system for internal combustion engine
DE602006020981T DE602006020981D1 (en) 2005-08-15 2006-08-08 Variable stroke valve system for an internal combustion engine
DE602006021537T DE602006021537D1 (en) 2005-08-15 2006-08-08 Variable stroke valve system for an internal combustion engine
EP07014214A EP1843014B1 (en) 2005-08-15 2006-08-08 Lift-variable valve-operating system for internal combustion engine
MXPA06009233A MXPA06009233A (en) 2005-08-15 2006-08-14 Lift-variable valve-operating system for internal combustion engine.
US11/808,723 US7363895B2 (en) 2005-08-15 2007-06-12 Lift-variable valve-operating system for internal combustion engine
US11/808,724 US7404385B2 (en) 2005-08-15 2007-06-12 Lift-variable valve-operating system for internal combustion engine
US11/808,722 US7392773B2 (en) 2005-08-15 2007-06-12 Lift-variable valve-operating system for internal combustion engine

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JP4999815B2 (en) * 2008-10-15 2012-08-15 本田技研工業株式会社 Variable valve operating device for internal combustion engine
JP4733172B2 (en) 2008-11-21 2011-07-27 本田技研工業株式会社 Plant control equipment
JP5302844B2 (en) 2008-11-21 2013-10-02 本田技研工業株式会社 Control device for internal combustion engine
WO2010090113A1 (en) 2009-02-06 2010-08-12 本田技研工業株式会社 Frequency component analyzing device
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