JP5436103B2 - Variable valve mechanism - Google Patents

Variable valve mechanism Download PDF

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Publication number
JP5436103B2
JP5436103B2 JP2009204045A JP2009204045A JP5436103B2 JP 5436103 B2 JP5436103 B2 JP 5436103B2 JP 2009204045 A JP2009204045 A JP 2009204045A JP 2009204045 A JP2009204045 A JP 2009204045A JP 5436103 B2 JP5436103 B2 JP 5436103B2
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Prior art keywords
lever
swing
swing lever
length
valve
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JP2011052643A (en
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弘毅 山口
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Otics Corp
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Otics Corp
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Priority to JP2009204045A priority Critical patent/JP5436103B2/en
Priority to EP10170089A priority patent/EP2299070A1/en
Priority to KR1020100075307A priority patent/KR101624265B1/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
    • 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
    • F01L1/205—Adjusting or compensating clearance by means of shims 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
    • 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
    • F01L13/0021—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 rocker arm ratio
    • 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
    • F01L13/0021—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 rocker arm ratio
    • F01L13/0026—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 rocker arm ratio by means of an eccentric
    • 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
    • F01L2013/0073—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 with an oscillating cam acting on the valve of the "Delphi" type

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Description

本発明は、内燃機関の運転状況に応じてバルブの開閉量を変更する可変動弁機構に関する。   The present invention relates to a variable valve mechanism that changes an opening / closing amount of a valve in accordance with an operating state of an internal combustion engine.

可変動弁機構の中には、図６に示す従来例の可変動弁機構９０のように、駆動力を供給する駆動用カム９１と、該駆動力をバルブ６に伝達して該バルブ６を開閉する、複数の揺動レバー９２〜９５が順に各関節で相対回動可能に接続されてなるリンク機構と、該リンク機構を変位させることによりバルブ６の開閉量を変更する可変機構９７とを含み構成されたものがある。   Among the variable valve mechanisms, like the conventional variable valve mechanism 90 shown in FIG. 6, a drive cam 91 for supplying a driving force and the driving force to the valve 6 are transmitted to the valve 6. A link mechanism in which a plurality of swing levers 92 to 95 that are opened and closed are connected in turn so as to be relatively rotatable at each joint, and a variable mechanism 97 that changes the opening and closing amount of the valve 6 by displacing the link mechanism. Some are composed.

特開平１１−３２４６２５号公報   JP-A-11-324625

ところが、上記の従来例の可変動弁機構９０では、各揺動レバー９２〜９５の寸法のずれ等でバルブ６の開閉量が所望の開閉量からずれてしまい、エンジン性能の低下に繋がるおそれがある。   However, in the variable valve mechanism 90 of the conventional example described above, the opening / closing amount of the valve 6 may deviate from the desired opening / closing amount due to the displacement of the dimensions of the swing levers 92 to 95, leading to a decrease in engine performance. is there.

そこで、各揺動レバーの寸法のずれ等でバルブの開閉量が所望の開閉量からずれても、調整できるようにすることを目的とする。   Accordingly, it is an object of the present invention to enable adjustment even if the opening / closing amount of the valve deviates from a desired opening / closing amount due to a difference in the size of each swing lever.

上記の目的を達成するため、本発明の可変動弁機構は、駆動力を供給する駆動用カムと、該駆動力をバルブに伝達して該バルブを開閉する、複数の揺動レバーが順に各関節で相対回動可能に接続されてなるリンク機構と、該リンク機構を変位させることにより前記バルブの開閉量を変更する可変機構とを含み構成された可変動弁機構において、前記リンク機構の少なくともいずれか１つの揺動レバーに対しては、該１つの揺動レバーの長さを調整する長さ調整機構が設けられ、該長さ調整機構で該長さを調整することにより、前記バルブの開閉量を調整できるように構成され、前記長さ調整機構は、長さ方向に２つの部材に分割形成された前記１つの揺動レバーと、該２つの部材の間に交換可能に挿入されたスペーサと、該スペーサを間に挿入した状態で前記２つの部材を連結解除可能に連結した連結部材とを含み構成され、前記スペーサを厚さの異なるスペーサに交換することにより、前記１つの揺動レバーの長さを調整できるように構成され、前記２つの部材のうちの一方の部材は、他方の部材に前記連結部材で連結される被連結部と、該被連結部から前記１つの揺動レバーの幅方向に延びて、該一方の部材に隣り合う他の揺動レバーに前記各関節の１つで相対回動可能に接続される接続軸とを含み構成され、前記被連結部は、前記接続軸よりも該接続軸の径方向に大きく形成され、該被連結部には、前記スペーサに当接する平面状の当接面が設けられたことを特徴とする。 In order to achieve the above object, a variable valve mechanism according to the present invention includes a driving cam for supplying a driving force, and a plurality of swing levers that transmit the driving force to the valve to open and close the valve. A variable valve mechanism comprising: a link mechanism that is connected so as to be relatively rotatable at a joint; and a variable mechanism that changes an opening / closing amount of the valve by displacing the link mechanism. Any one of the swing levers is provided with a length adjusting mechanism for adjusting the length of the one swing lever, and the length of the valve is adjusted by adjusting the length with the length adjusting mechanism. The length adjustment mechanism is configured to be able to adjust the opening / closing amount, and the length adjusting mechanism is inserted in a replaceable manner between the one swing lever divided into two members in the length direction and the two members. Insert the spacer between the spacers. In this state, the two members are connected to each other so as to be disengageable, and the length of the one swing lever can be adjusted by replacing the spacer with a spacer having a different thickness. One of the two members is connected to the other member by the connecting member, and extends from the connected portion in the width direction of the one swing lever, A connecting shaft connected to another swinging lever adjacent to one member so as to be relatively rotatable at one of the joints, and the connected portion is connected to the connecting shaft more than the connecting shaft. It is large in the radial direction, and the connected portion is provided with a flat contact surface that contacts the spacer .

また、更に、前記一方の部材及び前記他の揺動レバーは、特に限定されないが、前記接続軸は、前記被連結部の前記１つの揺動レバーの幅方向の両側に１つずつ設けられ、前記他の揺動レバーは、２つの前記接続軸のうちの一方に接続される部材と、他方に接続される部材とに分割形成されていることが好ましい。このように隣り合う他の揺動レバーを分割形成すれば、上記のように被連結部がその両側にある接続軸よりも径方向に大きい場合にも、簡単に組み立てることができるからである。   Furthermore, the one member and the other swing lever are not particularly limited, but the connection shaft is provided one on each side in the width direction of the one swing lever of the coupled portion, The other swing lever is preferably divided into a member connected to one of the two connecting shafts and a member connected to the other. This is because if the adjacent swing levers are divided and formed in this way, it is possible to easily assemble even when the connected parts are larger in the radial direction than the connecting shafts on both sides as described above.

本発明によれば、上記の通り、少なくともいずれか１つの揺動レバーに対して長さ調整機構を設け、該長さ調整機構で該揺動レバーの長さを調整することにより、バルブの開閉量を調整することができる。また、前記被連結部は、前記接続軸よりも該接続軸の径方向に大きく形成され、該被連結部には、前記スペーサに当接する平面状の当接面が設けられているので、該一方の部材の断面係数（曲げに対する強さ）を低下させることなく、当接面を形成することができる。 According to the present invention, as described above, a length adjustment mechanism is provided for at least one of the swing levers, and the length of the swing lever is adjusted by the length adjustment mechanism, thereby opening and closing the valve. The amount can be adjusted. The coupled portion is formed larger in the radial direction of the connecting shaft than the connecting shaft, and the coupled portion is provided with a planar contact surface that contacts the spacer. The contact surface can be formed without reducing the section modulus (strength against bending) of one member.

本発明の実施例の可変動弁機構を示す斜視図である。It is a perspective view which shows the variable valve mechanism of the Example of this invention. 同実施例の可変動弁機構を示す分解斜視図である。It is a disassembled perspective view which shows the variable valve mechanism of the Example. 同実施例の可変動弁機構を（ａ）に示し、その稼働時の様子を（ｂ）に示す側面図である。The variable valve mechanism of the Example is shown to (a), and the mode at the time of the operation | movement is a side view which shows to (b). 同実施例の可変動弁機構によるバルブの開閉量を、可変機構で減少させた際の様子を（ａ）に示し、増加させた際の様子を（ｂ）に示す側面図である。It is a side view which shows the mode when the amount of opening and closing of the valve by the variable valve mechanism of the same embodiment is decreased by the variable mechanism is shown in (a), and the mode when it is increased is shown in (b). 同実施例の可変動弁機構のよるバルブの開閉量を、長さ調整機構で減少調整した際の様子を（ａ）に示し、増加調整した際の様子を（ｂ）に示す側面図である。It is a side view which shows the mode when the opening / closing amount of the valve by the variable valve mechanism of the embodiment is adjusted to decrease by the length adjusting mechanism, and shows the mode when the increase is adjusted, as shown in (b). . 従来例の可変動弁機構を示す側面図である。It is a side view which shows the variable valve mechanism of a prior art example.

図１〜図５に示す本実施例の可変動弁機構７は、同一気筒に対して設けられた２本の吸気用又は排気用のバルブ６，６に対して設けられており、該２本のバルブ６，６の開閉量Ｌを連続的に変更する。この可変動弁機構７は、次に示す駆動用カム８と、第１〜第５の各揺動レバー１０，２０，３０，４０，５０，５０と、ロッカアーム６０，６０と、可変機構７０とを含み構成されている。ここで、第１〜第５の各揺動レバー１０，２０，３０，４０，５０，５０は、左右方向に直交する各方向にそれぞれ延び、かつ、左右方向に直交する各平面内でそれぞれ揺動可能となっている。それらの第１〜第５の揺動レバー１０，２０，３０，４０，５０，５０が、駆動用カム８の駆動力をロッカアーム６０，６０に伝達してバルブ６，６を開閉するリンク機構を構成している。   The variable valve mechanism 7 of this embodiment shown in FIGS. 1 to 5 is provided for two intake or exhaust valves 6 and 6 provided for the same cylinder. The opening / closing amount L of the valves 6 and 6 is continuously changed. The variable valve mechanism 7 includes a drive cam 8, first to fifth swing levers 10, 20, 30, 40, 50, 50, rocker arms 60, 60, and a variable mechanism 70. It is comprised including. Here, each of the first to fifth swing levers 10, 20, 30, 40, 50, 50 extends in each direction orthogonal to the left-right direction and swings within each plane orthogonal to the left-right direction. It is possible to move. The first to fifth swing levers 10, 20, 30, 40, 50, 50 transmit a driving force of the driving cam 8 to the rocker arms 60, 60 to open and close the valves 6, 6. It is composed.

［駆動用カム８］
駆動用カム８は、左右方向に延びるカムシャフト９に設けられており、該カムシャフト９の回転とともに回転する。この駆動用カム８は、断面形状が真円形でその真円形の中心Ａがカムシャフト９の軸心Ａｏから偏心している。そのカムシャフト９は、複数の可変動弁機構７，７・・に共通のシャフトであって、内燃機関の回転に従い回転する。 [Drive cam 8]
The driving cam 8 is provided on a camshaft 9 extending in the left-right direction, and rotates with the rotation of the camshaft 9. The drive cam 8 has a true circular cross-sectional shape, and the center A of the true circle is eccentric from the axis Ao of the camshaft 9. The camshaft 9 is a common shaft for the plurality of variable valve mechanisms 7, 7... And rotates according to the rotation of the internal combustion engine.

［第１揺動レバー１０］
第１揺動レバー１０は、その後端部にリング状のリング部１１を備え、そのリング部１１にて駆動用カム８に相対回動可能に外嵌されている。また、先端部には、第２揺動レバー２０の後端部に接続されるための被接続孔（図示略）が貫設されている。 [First swing lever 10]
The first swing lever 10 includes a ring-shaped ring portion 11 at a rear end portion thereof, and is externally fitted to the driving cam 8 at the ring portion 11 so as to be relatively rotatable. Further, a connected hole (not shown) for connecting to the rear end portion of the second swing lever 20 is provided through the tip portion.

［第２揺動レバー２０］
第２揺動レバー２０は、その長さ方向中間部にリング状のリング部（図示略）を備え、そのリング部にて後述する支持シャフト７２に外嵌されることによって、該支持シャフト７２に相対回動可能に支持されている。また、後端部に被接続孔２２を備え、該被接続孔２２と第１揺動レバー１０の先端部の被接続孔（図示略）とに１本の接続ピン２３が挿入されることによって、該第２揺動レバー２０の後端部が第１揺動レバー１０の先端部に相対回動可能に接続されている。また、該第２揺動レバー２０の先端部には、第３揺動レバーの後端部に接続されるための被接続孔２５が貫設されている。 [Second swing lever 20]
The second swing lever 20 includes a ring-shaped ring portion (not shown) in the middle in the length direction, and is fitted on a support shaft 72 (described later) at the ring portion. It is supported so as to be capable of relative rotation. Further, a connection hole 22 is provided at the rear end portion, and a single connection pin 23 is inserted into the connection hole 22 and a connection hole (not shown) at the tip of the first swing lever 10. The rear end portion of the second swing lever 20 is connected to the front end portion of the first swing lever 10 so as to be relatively rotatable. Further, a connected hole 25 for connecting to the rear end portion of the third swing lever is provided at the front end portion of the second swing lever 20.

［第３揺動レバー３０］
第３揺動レバー３０は、左右方向にレバー左側部材３０Ｌとレバー右側部材３０Ｒとに分割形成されている。そして、レバー左側部材３０Ｌの後端部の右側面には右方に延びる接続軸３３が突設され、レバー右側部材３０Ｒの後端部の左側面には左方に延びる接続軸３３が突設されている。そして、両接続軸３３，３３が第２揺動レバー２０の先端部の被接続孔２５に左右両側からそれぞれ挿入されることによって、該第３揺動レバー３０の後端部が第２揺動レバー２０の先端部に相対回動可能に接続されている。また、レバー左側部材３０Ｌ及びレバー右側部材３０Ｒの各先端部には、第４揺動レバー４０の後端部に接続されるための被接続孔３５，３５がそれぞれ貫設されている。 [Third swing lever 30]
The third swing lever 30 is divided into a left lever member 30L and a right lever member 30R in the left-right direction. A connecting shaft 33 extending rightward is projected from the right side surface of the rear end portion of the lever left side member 30L, and a connecting shaft 33 extending leftward is projected from the left side surface of the rear end portion of the lever right member 30R. Has been. The connecting shafts 33 and 33 are inserted into the connected holes 25 at the front end of the second swing lever 20 from the left and right sides, respectively, so that the rear end portion of the third swing lever 30 is moved into the second swing. The lever 20 is connected to the tip of the lever 20 so as to be relatively rotatable. Further, through-holes 35, 35 for connecting to the rear end portion of the fourth swing lever 40 are respectively penetrated at the front end portions of the lever left side member 30L and the lever right side member 30R.

［第４揺動レバー４０］
第４揺動レバー４０は、その長さ方向にレバー後側部材４１とレバー先側部材４４とに分割形成されている。また、この第４揺動レバー４０に対しては、その長さを調整するための長さ調整機構４７が設けられている。 [Fourth swing lever 40]
The fourth swing lever 40 is divided into a lever rear side member 41 and a lever front side member 44 in the length direction. The fourth swing lever 40 is provided with a length adjustment mechanism 47 for adjusting the length thereof.

レバー後側部材４１は、第４揺動レバー４０の後端部を構成している。このレバー後側部材４１は、レバー先側部材４４に連結される被連結部４２と、該被連結部４２の左側面から左方及び右側面から右方にそれぞれ延びる左右２本の接続軸４３，４３とを含み構成されている。被連結部４２は、接続軸４３，４３よりも該接続軸４３，４３の径方向に大きく（略２倍に）形成された円柱状の状態から、第４揺動レバー４０の長さ方向両側の部分が平面状に切り取られた形状をしている。その被連結部４２のレバー先側部材４４側の平面は、後述するスペーサ４８に当接する当接面４２ｂを構成している。また、該被連結部４２には、該被連結部４２をレバー先側部材４４に連結するためのボルト通し孔４２ａが、第４揺動レバー４０の長さ方向に貫設されている。また、このレバー後側部材４１は、左側の接続軸４３が、第３揺動レバー３０のレバー左側部材３０Ｌの先端部の被接続孔３５に挿入され、右側の接続軸４３が、第３揺動レバー３０のレバー右側部材３０Ｒの先端部の被接続孔３５に挿入されることによって、第３揺動レバー３０の先端部に相対回動可能に接続されている。また、該レバー後側部材４１の一方の接続軸４３は、可変機構７０の後述する可変用レバー７３の先端部にも接続されており、それにより該接続軸４３の変位方向が一円周方向に規制されている。   The lever rear member 41 constitutes a rear end portion of the fourth swing lever 40. The lever rear side member 41 includes a connected portion 42 connected to the lever tip side member 44 and two left and right connecting shafts 43 extending leftward from the left side and rightward from the right side of the connected portion 42. , 43. The to-be-connected part 42 is longer than the connection shafts 43, 43 in the radial direction of the connection shafts 43, 43 from the cylindrical state formed on the both sides in the length direction of the fourth swing lever 40. The part of is made into a shape cut out in a planar shape. The plane of the connected portion 42 on the lever tip side member 44 side constitutes a contact surface 42b that contacts a spacer 48 described later. Further, a bolt through hole 42 a for connecting the connected portion 42 to the lever tip side member 44 is provided in the connected portion 42 in the length direction of the fourth swing lever 40. Further, in the lever rear member 41, the left connecting shaft 43 is inserted into the connected hole 35 at the tip of the lever left member 30L of the third swinging lever 30, and the right connecting shaft 43 is connected to the third swinging member 30L. By being inserted into the connected hole 35 at the tip of the lever right side member 30 </ b> R of the moving lever 30, it is connected to the tip of the third swing lever 30 so as to be relatively rotatable. One connecting shaft 43 of the lever rear member 41 is also connected to the tip of a variable lever 73 (to be described later) of the variable mechanism 70, so that the displacement direction of the connecting shaft 43 is one circumferential direction. Is regulated.

レバー先側部材４４は、第４揺動レバー４０の後端部以外の部分を構成している。このレバー先側部材４４は、その後端部に、レバー後側部材４１を連結するための第４揺動レバー４０の長さ方向に延びる雌ネジ状のボルト穴４４ａと、スペーサ４８に当接する平面状の当接面４４ｂと、該スペーサ４８がずれるのを防止する突起４４ｃ，４４ｃとを備えている。また、該レバー先側部材４４の先端部には、第５揺動レバー５０，５０に接続されるための被接続孔（図示略）が貫設されている。   The lever tip side member 44 constitutes a portion other than the rear end portion of the fourth swing lever 40. The lever front side member 44 has a rear end portion that is in contact with the spacer 48 and a female screw-like bolt hole 44 a extending in the length direction of the fourth swing lever 40 for connecting the lever rear side member 41. And a projection 44c, 44c for preventing the spacer 48 from shifting. Further, a to-be-connected hole (not shown) for connecting to the fifth swing levers 50, 50 is provided at the tip of the lever tip side member 44.

長さ調整機構４７は、前述のレバー後側部材４１及びレバー先側部材４４と、該レバー後側部材４１と該レバー先側部材４４との間に交換可能に挿入されたスペーサ４８と、該スペーサ４８を間に挿入した状態でレバー後側部材４１とレバー先側部材４４とを連結解除可能に連結した連結部材としてのボルト４９とを含み構成されている。ここで、スペーサ４８は、板状の部材（シム）であって、その一辺から中央部に架けては切欠４８ａが設けられている。そして、ボルト４９が、レバー後側部材４１のボルト通し孔４２ａ及びスペーサ４８の切欠４８ａを挿通した状態で、レバー先側部材４４のボルト穴４４ａに螺着されている。   The length adjusting mechanism 47 includes the lever rear side member 41 and the lever front side member 44 described above, a spacer 48 inserted in an interchangeable manner between the lever rear side member 41 and the lever front side member 44, It includes a bolt 49 as a connecting member in which the lever rear side member 41 and the lever front side member 44 are connected so as to be disengageable with the spacer 48 inserted therebetween. Here, the spacer 48 is a plate-like member (shim), and a notch 48a is provided from one side to the center. The bolt 49 is screwed into the bolt hole 44 a of the lever tip side member 44 in a state where the bolt through hole 42 a of the lever rear side member 41 and the notch 48 a of the spacer 48 are inserted.

［第５揺動レバー５０］
第５揺動レバー５０，５０は、各バルブ６，６毎に１つずつ設けられた一対のレバーである。第５揺動レバー５０，５０は、その後端部にリング部５１，５１をそれぞれ備え、そのリング部５１，５１にて支持シャフト７２にそれぞれ外嵌されることによって、該支持シャフト７２に相対回動可能に支持されている。また、該第５揺動レバー５０，５０は、その長さ方向中間部に被接続孔５２，５２を備え、該被接続孔５２，５２と第４揺動レバー４０の先端部の被接続孔（図示略）とに、１本の接続ピン５３が挿入されることによって、該第５揺動レバー５０，５０の長さ方向中間部が該第４揺動レバー４０の先端部に相対回動可能に接続されている。また、該第５揺動レバー５０，５０の先端部の下面には、一対のロッカアーム６０，６０を押圧する押圧面５５，５５が形成されている。 [Fifth swing lever 50]
The fifth swing levers 50 and 50 are a pair of levers provided for each of the valves 6 and 6. The fifth swing levers 50, 50 are provided with ring portions 51, 51 at their rear ends, respectively, and are fitted to the support shaft 72 by the ring portions 51, 51, respectively. It is supported movably. Further, the fifth swing levers 50, 50 are provided with connected holes 52, 52 in the middle portion in the length direction, and the connected holes 52, 52 and the connected holes at the tip of the fourth swing lever 40. (Not shown), when one connecting pin 53 is inserted, the middle portion in the longitudinal direction of the fifth rocking levers 50 and 50 is rotated relative to the tip of the fourth rocking lever 40. Connected as possible. Further, pressing surfaces 55 and 55 for pressing the pair of rocker arms 60 and 60 are formed on the lower surfaces of the distal end portions of the fifth swing levers 50 and 50.

［ロッカアーム６０，６０］
ロッカアーム６０，６０は、各バルブ６，６毎に１つずつ設けられている。各ロッカアーム６０は、左右方向に直交する一方向に延び、その後端部がラッシュアジャスタ６７によって揺動可能に支持され、長さ方向中間部に第５揺動レバー５０の押圧面５５に当接するローラ６３を備え、先端部にバルブ６のステムエンドを押圧する押圧面６５を備えている。 [Rocker arms 60, 60]
One rocker arm 60, 60 is provided for each valve 6, 6. Each rocker arm 60 extends in one direction orthogonal to the left-right direction, and its rear end is supported by a lash adjuster 67 so as to be able to swing, and is a roller that abuts against the pressing surface 55 of the fifth swing lever 50 at the middle in the length direction. 63, and a pressing surface 65 for pressing the stem end of the valve 6 is provided at the tip.

また、バルブ６，６には、ロッカアーム６０，６０の押圧面６５，６５がバルブ６，６のステムエンドから離れる方向に変位するのに追従させて該バルブ６，６を閉じるためのバルブスプリング（図示略）が取り付けられている。   Further, the valves 6 and 6 are provided with valve springs for closing the valves 6 and 6 by following the displacement of the pressing surfaces 65 and 65 of the rocker arms 60 and 60 in the direction away from the stem ends of the valves 6 and 6. (Not shown) is attached.

よって、カムシャフト９の回転時には、図３（ｂ）に示すように、該カムシャフト９の回転とともに駆動用カム８が回転し、その駆動力が第１揺動レバー１０、第２揺動レバー２０、第３揺動レバー３０、第４揺動レバー４０、一対の第５揺動レバー５０，５０、一対のロッカアーム６０，６０の順に伝えられることによって、該一対のロッカアーム６０，６０が揺動し、該一対のロッカアーム６０，６０で一対のバルブ６，６を一定の開閉量Ｌで開閉する。   Therefore, when the camshaft 9 is rotated, as shown in FIG. 3 (b), the driving cam 8 is rotated with the rotation of the camshaft 9, and the driving force thereof is the first swing lever 10 and the second swing lever. 20, the third rocking lever 30, the fourth rocking lever 40, the pair of fifth rocking levers 50 and 50, and the pair of rocker arms 60 and 60 are transmitted in this order, so that the pair of rocker arms 60 and 60 rocks. The pair of rocker arms 60, 60 opens and closes the pair of valves 6, 6 with a constant opening / closing amount L.

［可変機構７０］
可変機構７０は、第４揺動レバー４０のレバー後側部材４１の接続軸４３を変位させることによってバルブ６，６の開閉量を変更する機構である。この可変機構７０は、次に示す可変用カム７１と、可変用レバー７３とを含み構成されている。 [Variable mechanism 70]
The variable mechanism 70 is a mechanism that changes the opening / closing amounts of the valves 6 and 6 by displacing the connection shaft 43 of the lever rear side member 41 of the fourth swing lever 40. The variable mechanism 70 includes a variable cam 71 and a variable lever 73 shown below.

可変用カム７１は、第２揺動レバー２０及び第５揺動レバー５０，５０を相対回動可能に支持した支持シャフト７２に設けられており、該支持シャフト７２の回動とともに回動する。この可変用カム７１の断面形状は真円形で、該真円形の中心Ｂは支持シャフト７２の軸心Ｂｏから偏心している。その支持シャフト７２は、回動装置（図示略）によって回動駆動される。   The variable cam 71 is provided on a support shaft 72 that supports the second rocking lever 20 and the fifth rocking levers 50 and 50 so as to be relatively rotatable, and rotates with the rotation of the support shaft 72. The cross-sectional shape of the variable cam 71 is a perfect circle, and the center B of the perfect circle is eccentric from the axis Bo of the support shaft 72. The support shaft 72 is rotationally driven by a rotational device (not shown).

可変用レバー７３は、左右方向に直交する一方向に延び、後端部にはリング状のリング部７４を備えている。そのリング部７４にて可変用カム７１に回動可能に外嵌されている。また、この可変用レバー７３は、そのの先端部に被接続孔７５が貫設されており、その被接続孔７５に第４揺動レバー４０のレバー後側部材４１の一方の接続軸４３が挿入されることによって、該可変用レバー７３の先端部が、第４揺動レバー４０の後端部に回動可能に接続されている。また、該第４揺動レバー４０の接続軸４３には、可変用レバー７３が該接続軸４３から抜けるのを防止するためのストッパ７６が取り付けられている。   The variable lever 73 extends in one direction orthogonal to the left-right direction, and includes a ring-shaped ring portion 74 at the rear end. The ring part 74 is rotatably fitted to the variable cam 71. Further, the variable lever 73 has a connection hole 75 penetrating at the tip thereof, and one connection shaft 43 of the lever rear side member 41 of the fourth swing lever 40 is inserted into the connection hole 75. By being inserted, the front end portion of the variable lever 73 is pivotally connected to the rear end portion of the fourth swing lever 40. Further, a stopper 76 for preventing the variable lever 73 from coming off the connecting shaft 43 is attached to the connecting shaft 43 of the fourth swing lever 40.

よって、図４（ａ）に示すように、支持シャフト７２が回動装置（図示略）によって駆動され、一方の周方向に回動した際には、該支持シャフト７２の回動とともに可変用カム７１が回動し、その駆動力が第４揺動レバー４０、一対の第５揺動レバー５０，５０の順に伝わることによって、該一対の第５揺動レバー５０，５０が、支持シャフト７２の軸心Ｂｏを軸に揺動しつつも、その揺動範囲が全体的に該軸心Ｂｏの一方の周方向にシフトし、バルブ６，６の開閉量Ｌが減少する。   Therefore, as shown in FIG. 4A, when the support shaft 72 is driven by a rotation device (not shown) and rotated in one circumferential direction, the variable cam is rotated along with the rotation of the support shaft 72. 71 is rotated, and the driving force is transmitted in the order of the fourth swing lever 40 and the pair of fifth swing levers 50, 50, so that the pair of fifth swing levers 50, 50 are connected to the support shaft 72. While the shaft Bo is swung around the shaft Bo, the swing range is entirely shifted in one circumferential direction of the shaft Bo, and the opening / closing amount L of the valves 6 and 6 is reduced.

また、図４（ｂ）に示すように、支持シャフト７２が回動装置（図示略）によって駆動され、他方の周方向に回動した際には、該支持シャフト７２の回動とともに可変用カム７１が回動し、その駆動力が第４揺動レバー４０、一対の第５揺動レバー５０，５０の順に伝わることによって、該一対の第５揺動レバー５０，５０が、支持シャフト７２の軸心Ｂｏを軸に揺動しつつも、その揺動範囲が全体的に該軸心Ｂｏの他方の周方向にシフトし、バルブ６，６の開閉量Ｌが増加する。   Further, as shown in FIG. 4B, when the support shaft 72 is driven by a rotation device (not shown) and rotates in the other circumferential direction, the variable cam is rotated along with the rotation of the support shaft 72. 71 is rotated, and the driving force is transmitted in the order of the fourth swing lever 40 and the pair of fifth swing levers 50, 50, so that the pair of fifth swing levers 50, 50 are connected to the support shaft 72. While the shaft Bo is swung around the shaft Bo, the swing range is entirely shifted in the other circumferential direction of the shaft Bo, and the opening / closing amount L of the valves 6 and 6 is increased.

次に、長さ調整機構４７を用いて、バルブ６，６の開閉量Ｌ（及びタイミング）を調整する際の様子を、開閉量Ｌを減少させるように調整する減少調整時と、増加させるように調整する増加調整時とに分けて以下に説明する。   Next, the state of adjusting the opening / closing amount L (and timing) of the valves 6 and 6 by using the length adjusting mechanism 47 is increased at the time of decreasing adjustment for adjusting the opening / closing amount L to be decreased. This will be described below separately for the time of increase adjustment.

｛減少調整時｝
図５（ａ）に示すように、ボルト４９を緩めてスペーサ４８を引き抜いてから、代わりに該スペーサ４８よりも厚さの薄いスペーサ４８Ｐを挿入しボルト４９を締め直すことによって、スペーサ４８をそれよりも厚さの薄いスペーサ４８Ｐに交換する。それによって、第４揺動レバー４０の長さが僅かに短くなり、それに伴い一対の第５揺動レバー５０，５０が、支持シャフト７２の軸心Ｂｏを中心とした一方の回動方向に僅かにシフトして、バルブ６，６の開閉量Ｌが僅かに減少する。 {During adjustment}
As shown in FIG. 5 (a), the bolts 49 are loosened and the spacers 48 are pulled out. Instead, the spacers 48P thinner than the spacers 48 are inserted and the bolts 49 are tightened. The spacer 48P is replaced with a thinner spacer 48P. Accordingly, the length of the fourth rocking lever 40 is slightly shortened, and accordingly, the pair of fifth rocking levers 50 and 50 are slightly in one rotating direction around the axis Bo of the support shaft 72. The opening / closing amount L of the valves 6 and 6 slightly decreases.

｛増加調整時｝
図５（ｂ）に示すように、ボルト４９を緩めてスペーサ４８を引き抜いてから、代わりに該スペーサ４８よりも厚さの厚いスペーサ４８Ｑを挿入しボルト４９を締め直すことによって、スペーサ４８をそれよりも厚さの厚いスペーサ４８Ｑに交換する。それによって、第４揺動レバー４０の長さが僅かに長くなり、それに伴い一対の第５揺動レバー５０，５０が、支持シャフト７２の軸心Ｂｏを中心とした他方の回動方向に僅かにシフトして、バルブ６，６の開閉量Ｌが僅かに増加する。 {Increase adjustment}
As shown in FIG. 5 (b), the bolts 49 are loosened and the spacers 48 are pulled out. Instead, the spacers 48Q that are thicker than the spacers 48 are inserted, and the bolts 49 are tightened. The spacer 48Q is replaced with a thicker spacer 48Q. Accordingly, the length of the fourth rocking lever 40 is slightly increased, and accordingly, the pair of fifth rocking levers 50 and 50 are slightly moved in the other rotation direction around the axis Bo of the support shaft 72. The opening / closing amount L of the valves 6 and 6 slightly increases.

なお、スペーサ４８Ｐ，４８，４８Ｑのランク間隔やランク数は任意に設定可能であり、それらのランク間隔やランク数を変更することにより調整精度や調整可能範囲を任意に決定することがきる。   Note that the rank intervals and the number of ranks of the spacers 48P, 48, and 48Q can be arbitrarily set, and the adjustment accuracy and the adjustable range can be arbitrarily determined by changing the rank interval and the number of ranks.

本実施例によれば、上記の通り、第４揺動レバーのレバー後側部材４１とレバー先側部材４４との間に挿入されたスペーサ４８を、厚さの異なるスペーサ４８Ｐ，４８Ｑに交換することによって、バルブ６，６の開閉量（及びタイミング）を調整することができる。そのため、より正確なバルブタイミングの同調が可能となりエンジン性能向上に寄与できる。また、各揺動レバー１０，２０，３０，４０，５０等の各部品の寸法精度の緩和ができ、製造の容易性が向上する。   According to the present embodiment, as described above, the spacer 48 inserted between the lever rear side member 41 and the lever tip side member 44 of the fourth swing lever is replaced with spacers 48P and 48Q having different thicknesses. Thus, the opening / closing amount (and timing) of the valves 6 and 6 can be adjusted. Therefore, more accurate valve timing can be synchronized, which contributes to improvement in engine performance. Further, the dimensional accuracy of each component such as the swing levers 10, 20, 30, 40, 50 can be relaxed, and the ease of manufacturing is improved.

また、レバー後側部材４１の被連結部４２を、その両側の接続軸４３，４３よりも径方向に大きく形成し、該被連結部４２に、スペーサ４８に当接する平面状の当接面４２ｂを設けることによって、レバー後側部材４１の断面係数（曲げに対する強さ）を低下させることなく、スペーサ４８に対する当り面積を大きく確保することができる。また、レバー後側部材４１をそのような中間部が太い形状にすることにより発生する組み立て性の問題は、第３揺動レバー３０を、上記のように、左右方向にレバー左側部材３０Ｌとレバー右側部材３０Ｒとに分割することにより解決することができる。よって、このように、第４揺動レバー４０のレバー後側部材４１の形状及び第３揺動レバー３０の形状を工夫することにより、長さ調整機構４７の主要部分を小さいスペースに強度を落とさずに纏めることができる。   Further, the connected portion 42 of the lever rear member 41 is formed to be larger in the radial direction than the connecting shafts 43 and 43 on both sides thereof, and a flat contact surface 42b that contacts the spacer 48 on the connected portion 42. By providing this, it is possible to secure a large contact area with respect to the spacer 48 without reducing the section modulus (strength against bending) of the lever rear member 41. Further, the problem of assembling that occurs when the lever rear side member 41 has such a thick middle portion is that the third rocking lever 30 is connected to the lever left side member 30L and the lever in the left-right direction as described above. This can be solved by dividing the right member 30R. Thus, by devising the shape of the lever rear member 41 of the fourth swing lever 40 and the shape of the third swing lever 30 in this way, the strength of the main part of the length adjusting mechanism 47 is reduced to a small space. Can be put together.

なお、本発明は上記実施例の構成に限定されるものではなく、発明の趣旨から逸脱しない範囲で変更して具体化することもできる。   In addition, this invention is not limited to the structure of the said Example, In the range which does not deviate from the meaning of invention, it can also change and actualize.

６ バルブ
７ 可変動弁機構
８ 駆動用カム
１０ 第１揺動レバー
２０ 第２揺動レバー
３０ 第３揺動レバー（他の揺動レバー）
３０Ｌ レバー左側部材
３０Ｒ レバー右側部材
４０ 第４揺動レバー（いずれか１つの揺動レバー）
４１ レバー後側部材（一方の部材）
４２ 被連結部
４２ｂ 当接面
４３ 接続軸
４４ レバー先側部材（他方の部材）
４７ 長さ調整機構
４８ スペーサ
４９ 連結部材としてのボルト
５０ 第５揺動レバー
７０ 可変機構
Ｌ バルブの開閉量 6 Valve 7 Variable valve mechanism 8 Drive cam 10 First swing lever 20 Second swing lever 30 Third swing lever (other swing lever)
30L Lever left side member 30R Lever right side member 40 Fourth rocking lever (any one rocking lever)
41 Lever rear member (one member)
42 Connected portion 42b Contact surface 43 Connection shaft 44 Lever tip side member (the other member)
47 Length adjusting mechanism 48 Spacer 49 Bolt as connecting member 50 Fifth swing lever 70 Variable mechanism L Opening / closing amount of valve

Claims (2)

駆動力を供給する駆動用カム（８）と、該駆動力をバルブ（６）に伝達して該バルブ（６）を開閉する、複数の揺動レバー（１０，２０，３０，４０，５０）が順に各関節で相対回動可能に接続されてなるリンク機構と、該リンク機構を変位させることにより前記バルブ（６）の開閉量（Ｌ）を変更する可変機構（７０）とを含み構成された可変動弁機構において、
前記リンク機構の少なくともいずれか１つの揺動レバー（４０）に対しては、該１つの揺動レバー（４０）の長さを調整する長さ調整機構（４７）が設けられ、
該長さ調整機構（４７）で該長さを調整することにより、前記バルブ（６）の開閉量（Ｌ）を調整できるように構成され、
前記長さ調整機構（４７）は、長さ方向に２つの部材（４１，４４）に分割形成された前記１つの揺動レバー（４０）と、該２つの部材（４１，４４）の間に交換可能に挿入されたスペーサ（４８）と、該スペーサ（４８）を間に挿入した状態で前記２つの部材（４１，４４）を連結解除可能に連結した連結部材（４９）とを含み構成され、
前記スペーサ（４８）を厚さの異なるスペーサ（４８Ｐ，４８Ｑ）に交換することにより、前記１つの揺動レバー（４０）の長さを調整できるように構成され、
前記２つの部材（４１，４４）のうちの一方の部材（４１）は、他方の部材（４４）に前記連結部材（４９）で連結される被連結部（４２）と、該被連結部（４２）から前記１つの揺動レバー（４０）の幅方向に延びて、該一方の部材（４１）に隣り合う他の揺動レバー（３０）に前記各関節の１つで相対回動可能に接続される接続軸（４３）とを含み構成され、
前記被連結部（４２）は、前記接続軸（４３）よりも該接続軸（４３）の径方向に大きく形成され、該被連結部（４２）には、前記スペーサ（４８）に当接する平面状の当接面（４２ｂ）が設けられたことを特徴とする可変動弁機構。 A driving cam (8) for supplying a driving force, and a plurality of swing levers (10, 20, 30, 40, 50) that transmit the driving force to the valve (6) to open and close the valve (6). Includes a link mechanism that is connected in order to be relatively rotatable at each joint, and a variable mechanism (70) that changes the opening / closing amount (L) of the valve (6) by displacing the link mechanism. In the variable valve mechanism
A length adjusting mechanism (47) for adjusting the length of the one swing lever (40) is provided for at least one swing lever (40) of the link mechanism,
By adjusting the length with the length adjustment mechanism (47), the opening / closing amount (L) of the valve (6) can be adjusted ,
The length adjusting mechanism (47) is provided between the one swing lever (40) divided into two members (41, 44) in the length direction and the two members (41, 44). A spacer (48) inserted in a replaceable manner, and a connecting member (49) in which the two members (41, 44) are connected in a releasable manner with the spacer (48) inserted therebetween. ,
By exchanging the spacer (48) with spacers (48P, 48Q) having different thicknesses, the length of the one swing lever (40) can be adjusted,
One member (41) of the two members (41, 44) includes a connected portion (42) connected to the other member (44) by the connecting member (49), and the connected portion ( 42) extends in the width direction of the one oscillating lever (40) and is rotatable relative to the other oscillating lever (30) adjacent to the one member (41) by one of the joints. A connecting shaft (43) to be connected,
The connected portion (42) is formed larger in the radial direction of the connecting shaft (43) than the connecting shaft (43), and the connected portion (42) is a flat surface that contacts the spacer (48). A variable valve mechanism characterized in that a contact surface (42b) is provided . 前記接続軸（４３）は、前記被連結部（４２）の前記１つの揺動レバー（４０）の幅方向の両側に１つずつ設けられ、
前記他の揺動レバー（３０）は、２つの前記接続軸（４３，４３）のうちの一方に接続される部材（３０Ｌ）と、他方に接続される部材（３０Ｒ）とに分割形成された請求項１記載の可変動弁機構。 The connection shaft (43) is provided one on each side in the width direction of the one swing lever (40) of the coupled portion (42),
The other swing lever (30) is divided into a member (30L) connected to one of the two connecting shafts (43, 43) and a member (30R) connected to the other. The variable valve mechanism according to claim 1.
JP2009204045A 2009-09-03 2009-09-03 Variable valve mechanism Expired - Fee Related JP5436103B2 (en)

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