JP2020112130A - Variable valve mechanism of internal combustion engine - Google Patents

Variable valve mechanism of internal combustion engine Download PDF

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JP2020112130A
JP2020112130A JP2019005188A JP2019005188A JP2020112130A JP 2020112130 A JP2020112130 A JP 2020112130A JP 2019005188 A JP2019005188 A JP 2019005188A JP 2019005188 A JP2019005188 A JP 2019005188A JP 2020112130 A JP2020112130 A JP 2020112130A
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roller
rocker shaft
shaft
rotating member
rocker
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JP2020112130A5 (en
JP7101624B2 (en
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杉浦　憲
Ken Sugiura
憲 杉浦
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Otics Corp
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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
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L2013/0052—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve
    • 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
    • F01L2305/00—Valve arrangements comprising rollers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/03—Auxiliary actuators
    • F01L2820/031—Electromagnets

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Transmission Devices (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

To reduce inertia mass of a rotating part of a link arm, and to prevent slide contact of a roller guide and a roller from acting as rotation resistance of the rotating part, so that driving force required for a rotating device is reduced.SOLUTION: A roller 16 is displaceably supported by a rocker arm main body 10. Two lock-in arms 23, 24 are rotated by a rotating device, and a link arm 20 and the roller 16 are displaced in a longitudinal direction of a rocker shaft along a selected spiral groove on the basis of selection of the lock-in arms 23, 24 to be locked in the spiral grooves formed on a cam shaft, to switch contact and non-contact of a cam with the roller 16. The link arm 20 is divided into a rotating member 21 rotated by the rotating device and including two lock-in arms 23, 24, and a non-rotating member 27 not rotated by the rotating device and including a roller guide 31.SELECTED DRAWING: Figure 2

Description

本発明は、内燃機関のバルブを駆動するとともに、その駆動状態を内燃機関の運転状況に応じて変更する可変動弁機構に関する。 The present invention relates to a variable valve mechanism that drives a valve of an internal combustion engine and changes its drive state according to the operating condition of the internal combustion engine.

本出願人は、先に、図７に示す内燃機関の可変動弁機構５１を提案した（特許文献１）。この可変動弁機構５１は、カムシャフト５２に、カム５３と２つの螺旋溝５４，５５とが設けられ、カムシャフト５２と平行に延びるロッカシャフト５６に、ロッカアーム本体５７が揺動可能に支持され、ロッカアーム本体５７に、ロッカシャフト５６と平行に延びるローラ軸５８が設けられ、ローラ軸５８に、カム５３が当接しうるローラ５９がロッカシャフト長方向に変位可能に支持され、２つの螺旋溝５４，５５に択一的に係入する２つの係入アーム６１とローラ５９の両側面を抱持するローラガイド６３（摺接部）とを含むリンクアーム６０が、ロッカシャフト長方向に変位可能に設けられている。そして、リンクアーム６０全体を回動装置により回動させて、一方の係入アーム６１を一方の螺旋溝５４に係入させるか又は他方の係入アーム（図示略）を他方の螺旋溝５５に係入させるかを選択することにより、選択した螺旋溝５４，５５に沿ってリンクアーム６０及びローラ５９をロッカシャフト長方向に変位させて、該ローラ５９に前記カム５３が当接するか又は当接しないかを切り替える機構である。 The present applicant previously proposed a variable valve mechanism 51 for an internal combustion engine shown in FIG. 7 (Patent Document 1). In this variable valve mechanism 51, a cam shaft 52 is provided with a cam 53 and two spiral grooves 54 and 55, and a rocker shaft 56 extending parallel to the cam shaft 52 has a rocker arm body 57 swingably supported. A roller shaft 58 extending parallel to the rocker shaft 56 is provided on the rocker arm main body 57, and a roller 59 that can contact the cam 53 is supported on the roller shaft 58 so as to be displaceable in the rocker shaft longitudinal direction. , 55 alternatively, two linking arms 61, and a link arm 60 including a roller guide 63 (sliding contact portion) that holds both side surfaces of the roller 59 are displaceable in the rocker shaft longitudinal direction. It is provided. Then, the entire link arm 60 is rotated by the rotating device so that one engagement arm 61 is engaged with the one spiral groove 54 or the other engagement arm (not shown) is engaged with the other spiral groove 55. By selecting whether to engage, the link arm 60 and the roller 59 are displaced in the rocker shaft length direction along the selected spiral grooves 54 and 55, and the cam 53 abuts or abuts on the roller 59. It is a mechanism to switch whether or not.

特開２０１４−２２４４９６号公報JP, 2014-224496, A

前記リンクアーム６０は、２つの係入アーム６１とローラガイド６３とを一体的に含み、これら全体を回動させるために慣性質量が大きく、また、ローラガイド６３とローラ５９との摺接が回動抵抗になるため、駆動力の大きい回動装置が必要であった。回動装置として例えば電磁ソレノイドを用いる場合には、容量の大きい大型の電磁ソレノイドが必要になり、内燃機関の大型化や、電力消費増加による燃費悪化に繋がるという問題があった。 The link arm 60 integrally includes two engagement arms 61 and a roller guide 63, and has a large inertial mass to rotate the whole of them, and the sliding contact between the roller guide 63 and the roller 59 rotates. Since it becomes a dynamic resistance, a rotating device having a large driving force is required. When an electromagnetic solenoid is used as the rotating device, for example, a large electromagnetic solenoid having a large capacity is required, and there is a problem that the internal combustion engine becomes large and fuel consumption deteriorates due to an increase in power consumption.

そこで、本発明の課題は、リンクアームの回動部分の慣性質量を低減し、またローラガイドとローラとの摺接が回動部分の回動抵抗にならないようにし、もって回動装置に要求される駆動力を低減することにある。 Therefore, an object of the present invention is to reduce the inertial mass of the rotating portion of the link arm, and to prevent the sliding contact between the roller guide and the roller from becoming the rotational resistance of the rotating portion. It is to reduce the driving force.

本発明の可変動弁機構は、
カムシャフトに、カムと２つの螺旋溝とが設けられ、
カムシャフトと平行に延びるロッカシャフトに、ロッカアーム本体が揺動可能に支持され、
ロッカアーム本体に、ロッカシャフトと平行に延びるローラ軸が設けられ、
ローラ軸に、カムが当接しうるローラがロッカシャフト長方向に変位可能に支持され、
２つの螺旋溝に択一的に係入する２つの係入アームとローラの両側面を抱持するローラガイドとを含むリンクアームが、ロッカシャフト長方向に変位可能に設けられ、
２つの係入アームを回動装置により回動させて、一方の係入アームを一方の螺旋溝に係入させるか又は他方の係入アームを他方の螺旋溝に係入させるかを選択することにより、選択した螺旋溝に沿ってリンクアーム及びローラをロッカシャフト長方向に変位させて、該ローラに前記カムが当接するか又は当接しないかを切り替える内燃機関の可変動弁機構において、
リンクアームが、回動装置により回動する２つの係入アームを含む回動部材と、回動装置により回動しないローラガイドを含む非回動部材とに、分割形成されていることを特徴とする。 The variable valve mechanism of the present invention,
The camshaft is provided with a cam and two spiral grooves,
The rocker arm body is swingably supported on a rocker shaft extending parallel to the cam shaft,
The rocker arm body is provided with a roller shaft extending parallel to the rocker shaft,
A roller, with which a cam can abut, is supported on the roller shaft so as to be displaceable in the rocker shaft longitudinal direction,
A link arm including two engaging arms that selectively engage with the two spiral grooves and a roller guide that holds both side surfaces of the roller is provided so as to be displaceable in the length direction of the rocker shaft.
Rotating the two engaging arms by a rotating device to select whether one engaging arm is engaged in one spiral groove or the other engaging arm is engaged in the other spiral groove. According to the above, in the variable valve mechanism of the internal combustion engine, the link arm and the roller are displaced in the rocker shaft length direction along the selected spiral groove, and the cam is contacted or not contacted with the roller.
The link arm is divided into a rotating member including two engaging arms that rotate by a rotating device and a non-rotating member including a roller guide that does not rotate by the rotating device. To do.

本発明によれば、リンクアームの回動部分である回動部材の慣性質量を低減でき、またローラガイドとローラとの摺接が回動部材の回動抵抗にならないようにでき、もって回動装置に要求される駆動力を低減することができる。回動装置として例えば電磁ソレノイドを用いる場合には、容量の小さい小型の電磁ソレノイドで済み、内燃機関の小型化や、電力消費減少による燃費向上が期待できる。 According to the present invention, the inertial mass of the rotating member, which is the rotating portion of the link arm, can be reduced, and the sliding contact between the roller guide and the roller can be prevented from becoming the rotating resistance of the rotating member, so that the rotation can be achieved. The driving force required for the device can be reduced. When an electromagnetic solenoid is used as the rotating device, for example, a small electromagnetic solenoid having a small capacity is sufficient, and the internal combustion engine can be downsized and fuel consumption can be improved by reducing power consumption.

図１は実施例の可変動弁機構を示し、（ａ）は前上からみた斜視図、（ｂ）は後下からみた斜視図である。1A and 1B show a variable valve mechanism according to an embodiment, wherein FIG. 1A is a perspective view seen from the front upper side, and FIG. 1B is a perspective view seen from the rear lower side. 図２は同機構のローラロッカアーム及びリンクアームを示し、（ａ）は前上から見た分解斜視図、（ｂ）は後下から見た分解斜視図である。2A and 2B show a roller rocker arm and a link arm of the same mechanism. FIG. 2A is an exploded perspective view seen from the front upper side, and FIG. 2B is an exploded perspective view seen from the rear lower side. 図３は同機構のローラを第一カムが当接する位置に変位させた状態を示し、（ａ）は平面図、（ｂ）はＩＩＩｂ−ＩＩＩｂ側断面図である。3A and 3B show a state in which the roller of the mechanism is displaced to a position where the first cam abuts, FIG. 3A is a plan view, and FIG. 3B is a sectional view taken along the line IIIb-IIIb. 図４も同状態を示し、（ａ）はＩＶａ−ＩＶａ側断面図、（ｂ）は（ａ）からリフトしたときの側断面図である。FIG. 4 also shows the same state, (a) is a side sectional view of IVa-IVa, and (b) is a side sectional view when lifted from (a). 図５は同機構のローラを第二カムが当接する位置に変位させた状態を示し、（ａ）は平面図、（ｂ）はＶｂ−Ｖｂ側断面図である。FIG. 5 shows a state in which the roller of the same mechanism is displaced to a position where the second cam comes into contact, (a) is a plan view, and (b) is a Vb-Vb side sectional view. 図６も同状態を示し、（ａ）はＶＩａ−ＶＩａ側断面図、（ｂ）は（ａ）からリフトしたときの側断面図である。FIG. 6 also shows the same state, (a) is a side sectional view of VIa-VIa, and (b) is a side sectional view when lifted from (a). 図７は従来例の可変動弁機構の斜視図である。FIG. 7 is a perspective view of a conventional variable valve mechanism.

１．ロッカアーム本体
ロッカアーム本体は、ローラをローラ軸にロッカシャフト長方向に変位可能に支持する関係で、ロッカシャフト長方向に幅広となるため、複数のバルブ押圧部を設けて、複数のバルブを駆動するタイプとすることが好ましい。但し、１つのバルブを駆動するタイプとしてもよい。
また、ローラ軸に支持するローラの数は、１つでも複数でもよい。 1. Rocker arm body The rocker arm body is a type that drives multiple valves by providing multiple valve pressing parts because it is wide in the rocker shaft length direction because it supports the roller so that it can be displaced in the rocker shaft length direction. It is preferable that However, it may be a type that drives one valve.
Further, the number of rollers supported by the roller shaft may be one or plural.

２．リンクアーム
回動部材は、ロッカシャフトに、ロッカシャフト周方向に回動可能に且つロッカシャフト長方向にスライド変位可能に外嵌されていることが好ましい。
非回動部材は、ロッカシャフトに、ロッカシャフト長方向に変位可能に外嵌され、ロッカシャフト周方向に回動不能となっていることが好ましい。
但し、回動部材と非回動部材は、ロッカシャフトとは別の、カムシャフトと平行に延びるシャフトに、上記と同様に外嵌されていてもよい。 2. The link arm rotating member is preferably fitted onto the rocker shaft so as to be rotatable in the circumferential direction of the rocker shaft and slidable in the longitudinal direction of the rocker shaft.
It is preferable that the non-rotating member is externally fitted to the rocker shaft so as to be displaceable in the rocker shaft longitudinal direction and is not rotatable in the rocker shaft circumferential direction.
However, the rotating member and the non-rotating member may be externally fitted to a shaft, which is different from the rocker shaft and extends parallel to the cam shaft, in the same manner as described above.

回動部材と非回動部材（すなわちリンクアーム）を一緒にロッカシャフト長方向に変位することを容易にするため、回動部材は、非回動部材に、ロッカシャフト長方向に相対変位しないように嵌入していることが好ましい。 In order to facilitate the displacement of the rotating member and the non-rotating member (that is, the link arm) together in the length direction of the rocker shaft, the rotating member should not be displaced relative to the non-rotating member in the length direction of the rocker shaft. It is preferable that it is fitted in.

ローラガイドの構造は、特に限定されないが、ロッカアーム本体揺動時のローラ軸の動きを逃がす切欠が形成されたガイド壁が、ロッカシャフト長方向にローラ嵌入空間をおいて少なくとも２つ並んで構成されている態様を例示できる。 The structure of the roller guide is not particularly limited, but at least two guide walls are formed side by side in the rocker shaft longitudinal direction with a roller fitting space formed so as to have a notch for escaping the movement of the roller shaft when the rocker arm body is rocked. Can be exemplified.

３．回動装置
回動装置としては、特に限定されないが、電磁ソレノイド、油圧機構、電動モータ機構等によるものを例示できる。 3. Rotating Device The rotating device is not particularly limited, but may be an electromagnetic solenoid, a hydraulic mechanism, an electric motor mechanism, or the like.

４．ローラに前記カムが当接しないときの態様
ローラに前記カムが当接しないときの態様としては、ローラに別のカムも当接しない態様、ローラに別のゼロリフトの円カムが当接する態様、ローラに別のノーズプロフィールのカムが当接する態様とを例示できる。次に説明する実施例は、ローラに別のノーズプロフィールのカムが当接する態様である。 4. Mode when the cam does not contact the roller As mode when the cam does not contact the roller, modes in which another cam does not contact the roller, modes in which another zero lift circular cam contacts the roller, and rollers It is possible to exemplify a mode in which a cam having another nose profile abuts. In the embodiment described below, a cam having a different nose profile comes into contact with the roller.

次に、本発明の実施例を図１〜図６を参照して説明する。なお、実施例の各部の構造、形状、数等は例示であり、発明の趣旨から逸脱しない範囲で適宜変更できる。 Next, an embodiment of the present invention will be described with reference to FIGS. It should be noted that the structure, shape, number, etc. of each part of the embodiment are examples, and can be changed as appropriate without departing from the spirit of the invention.

本実施例の可変動弁機構１は、
カムシャフト２に、カム３と２つの螺旋溝５，７とが設けられ、
カムシャフト２と平行に延びるロッカシャフト９に、ロッカアーム本体１０が揺動可能に支持され、
ロッカアーム本体１０に、ロッカシャフト９と平行に延びるローラ軸１５が設けられ、
ローラ軸１５に、カム３が当接しうるローラ１６がロッカシャフト長方向に変位可能に支持され、
２つの螺旋溝５，７に択一的に係入する２つの係入アーム２３，２４とローラ１６の両側面を抱持するローラガイド３１とを含むリンクアーム２０が、ロッカシャフト長方向に変位可能に設けられ、
２つの係入アーム２３，２４を回動装置４０により回動させて、一方の係入アーム２３を一方の螺旋溝５に係入させるか又は他方の係入アーム２４を他方の螺旋溝７に係入させるかを選択することにより、選択した螺旋溝５，７に沿ってリンクアーム２０及びローラ１６をロッカシャフト長方向に変位させて、該ローラ１６に前記カム３が当接するか又は当接しないかを切り替える機構であって、
リンクアーム２０が、回動装置４０により回動する２つの係入アーム２３，２４を含む回動部材２１と、回動装置４０により回動しないローラガイド３１を含む非回動部材２７とに、分割形成されていることを特徴とする。 The variable valve mechanism 1 of this embodiment is
The cam shaft 2 is provided with a cam 3 and two spiral grooves 5 and 7,
A rocker arm body 10 is swingably supported on a rocker shaft 9 extending in parallel with the cam shaft 2,
The rocker arm body 10 is provided with a roller shaft 15 extending parallel to the rocker shaft 9,
A roller 16 on which the cam 3 can abut is supported by the roller shaft 15 so as to be displaceable in the rocker shaft longitudinal direction,
The link arm 20 including the two engaging arms 23 and 24 that selectively engage with the two spiral grooves 5 and 7 and the roller guide 31 that holds both side surfaces of the roller 16 is displaced in the rocker shaft longitudinal direction. Is possible
The two engaging arms 23 and 24 are rotated by the rotating device 40 so that one of the engaging arms 23 is engaged with one spiral groove 5 or the other engaging arm 24 is combined with the other spiral groove 7. By selecting whether to engage it, the link arm 20 and the roller 16 are displaced in the rocker shaft length direction along the selected spiral grooves 5 and 7, and the cam 3 abuts or abuts on the roller 16. It is a mechanism to switch whether to not
The link arm 20 includes a rotating member 21 that includes two engaging arms 23 and 24 that rotate by the rotating device 40, and a non-rotating member 27 that includes a roller guide 31 that does not rotate by the rotating device 40. It is characterized by being divided and formed.

カムシャフト長方向と、ロッカシャフト長方向と、ローラ軸長方向は、いずれも図１（ａ）、図３（ａ）及び図５（ａ）での左右方向であって同一である。そこで、以下では、これらの図で左に向かう方向を軸長方向ｄ１といい、右に向かう方向を軸長方向ｄ２という。 The camshaft length direction, the rocker shaft length direction, and the roller shaft length direction are the same as the left and right directions in FIG. 1A, FIG. 3A, and FIG. 5A. Therefore, hereinafter, the direction to the left in these figures is referred to as the axial length direction d1, and the direction to the right is referred to as the axial length direction d2.

［カム等］
カムシャフト２には、軸長方向ｄ１側から軸長方向ｄ２側へ順に、駆動カムとしての第一カム３、第二カム４、第一カム３及び第二カム４と、カムレール溝としての第二螺旋溝７、円環溝６及び第一螺旋溝５とが、並んで設けられている。 [Cam etc.]
The camshaft 2 has a first cam 3, a second cam 4, a first cam 3 and a second cam 4 as drive cams, and a first cam rail groove as a cam rail groove in order from the axial length direction d1 side to the axial length direction d2 side. The two spiral grooves 7, the annular groove 6 and the first spiral groove 5 are provided side by side.

２つの第一カム３は、断面形状が円形のベース円と、ベース円から突出した相対的に高リフトかつ狭作用角のノーズとからなり、主に高速回転域で使用されるものである。
２つの第二カム４は、断面形状が円形のベース円と、ベース円から突出した相対的に低リフトかつ広作用角のノーズとからなり、主に低速回転域で使用されるものである。 The two first cams 3 are composed of a base circle having a circular cross-sectional shape and a nose having a relatively high lift and a narrow working angle, which protrudes from the base circle, and is mainly used in a high speed rotation range.
The two second cams 4 are composed of a base circle having a circular cross section and a nose protruding from the base circle and having a relatively low lift and a wide working angle, and are mainly used in a low speed rotation range.

円環溝６は、リンクアーム２０を軸長方向ｄ１，ｄ２に変位不能に係止するための溝であって、軸長方向にずれない円環状の溝である。 The annular groove 6 is a groove for locking the link arm 20 in a displaceable manner in the axial direction d1, d2, and is an annular groove that does not shift in the axial direction.

第一螺旋溝５は、リンクアーム２０を軸長方向一方ｄ１に変位させるための溝であって、円環溝６よりも軸長方向他方ｄ２側に設けられている。第一螺旋溝５は、その基端から所定の位置までは、カムシャフト２の回転方向の反対方向に軸長方向ｄ１，ｄ２にずれることなく延びており、該所定の位置からは、カムシャフト２の回転方向の反対方向に進むに従い軸長方向一方ｄ１側に進む螺旋状に延びて円環溝６に合流している。この螺旋状に延びる部分は、第一及び第二カム３，４のベース円作用時に、第一係入アーム２３の先端部が係入する位相に設けられている。 The first spiral groove 5 is a groove for displacing the link arm 20 in one axial direction d1 and is provided on the other axial direction d2 side of the annular groove 6. The first spiral groove 5 extends from the base end to a predetermined position in the axial direction d1 and d2 in the direction opposite to the rotation direction of the cam shaft 2 without being displaced, and from the predetermined position, the cam shaft 2 extends. As it goes in the direction opposite to the rotating direction of 2, it extends spirally toward one side d1 in the axial direction and joins the annular groove 6. This spirally extending portion is provided in a phase in which the tip portion of the first engaging arm 23 is engaged when the first and second cams 3, 4 act on the base circle.

第二螺旋溝７は、リンクアーム２０を軸長方向他方ｄ２に変位させるための溝であって、円環溝６よりも軸長方向一方ｄ１側に設けられている。第二螺旋溝７は、その基端から所定の位置までは、カムシャフト２の回転方向の反対方向に軸長方向ｄ１，ｄ２にずれることなく延びており、該所定の位置からは、カムシャフト２の回転方向の反対方向に進むに従い軸長方向他方ｄ２側に進む螺旋状に延びて円環溝６に合流している。この螺旋状に延びる部分は、第一及び第二カム３，４のベース円作用時に、第二係入アーム２４の先端部が係入する位相に設けられている。 The second spiral groove 7 is a groove for displacing the link arm 20 in the other axial direction d2, and is provided on the one axial direction d1 side of the annular groove 6. The second spiral groove 7 extends from the base end to a predetermined position in the axial direction d1 and d2 in the direction opposite to the rotation direction of the camshaft 2 without being displaced, and from the predetermined position, the camshaft 2 is rotated. As it goes in the direction opposite to the direction of rotation of 2, it extends spirally toward the other d2 side in the axial direction and joins the annular groove 6. This spirally extending portion is provided in a phase in which the tip of the second engaging arm 24 is engaged when the first and second cams 3, 4 act on the base circle.

［ロッカアーム］
ロッカアーム本体１０は、図２等に示すように、軸長方向に離間した第一側壁部１１及び第二側壁部１２と、第一側壁部１１と第二側壁部１２の前端部間を連結する前連結部１３と、第一側壁部１１と第二側壁部１２との間に配されて前連結部１３に支持された中間壁部１４と、第一側壁部１１と中間壁部１４との間に架け渡されたローラ軸１５とを含み構成されている。 [Rocker arm]
As shown in FIG. 2 and the like, the rocker arm body 10 connects the first side wall portion 11 and the second side wall portion 12 which are separated in the axial direction, and the front end portions of the first side wall portion 11 and the second side wall portion 12 to each other. Of the front connecting portion 13, the intermediate wall portion 14 disposed between the first side wall portion 11 and the second side wall portion 12 and supported by the front connecting portion 13, and the first side wall portion 11 and the intermediate wall portion 14. It is configured to include a roller shaft 15 bridged between them.

第一側壁部１１及び第二側壁部１２の長さ方向後部に形成された被支持穴にロッカシャフト９が通され、第一側壁部１１の長さ方向中間部に前記ローラ軸１５が位置し、前連結部１３の下面にバルブＶを押圧するバルブ押圧部１７が形成されている。ロッカアーム本体１０は、ロッカシャフト周方向に揺動可能であるが、ロッカシャフト長方向（軸長方向ｄ１，ｄ２）には変位しないようになっている。 The rocker shaft 9 is passed through the supported holes formed at the rear portions in the lengthwise direction of the first side wall portion 11 and the second side wall portion 12, and the roller shaft 15 is located at the middle portion in the lengthwise direction of the first side wall portion 11. A valve pressing portion 17 that presses the valve V is formed on the lower surface of the front connecting portion 13. The rocker arm body 10 is swingable in the rocker shaft circumferential direction, but is not displaced in the rocker shaft longitudinal direction (axial length directions d1 and d2).

ローラ軸１５には、２つのローラ１６がローラ軸周方向に回転可能に且つローラ軸長方向（軸長方向ｄ１，ｄ２）にスライド変位可能に外嵌されている。 Two rollers 16 are fitted onto the roller shaft 15 so as to be rotatable in the roller shaft circumferential direction and slidable in the roller shaft longitudinal direction (axial length directions d1 and d2).

［リンクアーム］
リンクアーム２０は、図２等に示すように、回動部材２１と非回動部材２７とに分割形成され、両部材が組み付けられてなる。 [Link arm]
As shown in FIG. 2 and the like, the link arm 20 is divided into a rotating member 21 and a non-rotating member 27, and both members are assembled.

（回動部材）
回動部材２１は、筒状基部２２と、筒状基部２２から、正面視で軸長方向に互いに離間し、側面視でＶ字をなするように、前方へ突出した第一係入アーム２３及び上方へ突出した第二係入アーム２４とを含み構成されている。 (Rotating member)
The rotating member 21 is separated from the tubular base portion 22 and the tubular base portion 22 in the axial direction in a front view and protrudes forward so as to form a V shape in a side view. And a second engaging arm 24 protruding upward.

筒状基部２２は、ロッカシャフト９に、ロッカシャフト周方向に回動可能に且つロッカシャフト長方向（軸長方向ｄ１，ｄ２）にスライド変位可能に外嵌されている。筒状基部２２の背面には、板状の被押圧部２５が設けられ、被押圧部２５の下部又は上部が択一的に前方へ回動装置４０により押圧されることにより、回動部材２１が回動する。筒状基部２２の下部には、ロッカシャフト長方向にもロッカシャフト周方向にも（後述するボルト３６径よりも）大きい逃がし穴２６が形成され、この逃がし穴２６に後述するスリーブ３９が通っている。 The tubular base portion 22 is fitted onto the rocker shaft 9 so as to be rotatable in the rocker shaft circumferential direction and slidable in the rocker shaft longitudinal direction (axial length directions d1 and d2). A plate-shaped pressed portion 25 is provided on the back surface of the cylindrical base portion 22, and the lower portion or the upper portion of the pressed portion 25 is selectively pushed forward by the rotating device 40, so that the rotating member 21. Rotates. A large escape hole 26 is formed in the lower portion of the cylindrical base portion 22 both in the length direction of the rocker shaft and in the circumferential direction of the rocker shaft (than the diameter of a bolt 36 described later). There is.

第一係入アーム２３は、その先端部が第一螺旋溝５ないし円環溝６に係入可能に形成されている。第二係入アーム２４は、その先端部が第二螺旋溝７ないし円環溝６に係入可能に形成されている。 The first engaging arm 23 is formed such that its tip portion can be engaged with the first spiral groove 5 or the annular groove 6. The second engaging arm 24 is formed such that its tip portion can be engaged with the second spiral groove 7 or the annular groove 6.

（非回動部材）
非回動部材２７は、回動部材２１の筒状基部２２が嵌入する嵌入空間をおいて離れた第一筒状部２８及び第二筒状部２９と、第一筒状部２８と第二筒状部２９の下部間を連結する下連結部３０と、第一筒状部２８から前方へ突出したローラガイド３１とを含み構成されている。 (Non-rotating member)
The non-rotating member 27 includes a first tubular portion 28, a second tubular portion 29, a first tubular portion 28, and a second tubular portion 29 that are separated from each other with a fitting space into which the tubular base portion 22 of the rotating member 21 is fitted. It is configured to include a lower connecting portion 30 that connects lower portions of the tubular portion 29 and a roller guide 31 that protrudes forward from the first tubular portion 28.

第一筒状部２８及び第二筒状部２９は、ロッカシャフト９に、ロッカシャフト長方向（軸長方向ｄ１，ｄ２）にスライド変位可能に外嵌されている。 The first tubular portion 28 and the second tubular portion 29 are fitted onto the rocker shaft 9 so as to be slidable in the rocker shaft longitudinal direction (axial length directions d1 and d2).

第一筒状部２８及び第二筒状部２９の下には、下連結部３０から離れる方向において段状に低くなる係合段部３４が設けられている。 Below the first tubular portion 28 and the second tubular portion 29, an engagement step portion 34 that is lowered stepwise in the direction away from the lower connecting portion 30 is provided.

下連結部３０には、ロッカシャフト長方向（軸長方向ｄ１，ｄ２）に延びる長孔３５が形成され、この長孔３５に後述するスリーブ３９が通っている。 An elongated hole 35 extending in the rocker shaft longitudinal direction (axial length directions d1 and d2) is formed in the lower connecting portion 30, and a sleeve 39 described later passes through the elongated hole 35.

ローラガイド３１は、ロッカアーム本体揺動時のローラ軸１５の変位を逃がす切欠３３が形成されたガイド壁３２が、ロッカシャフト長方向（軸長方向ｄ１，ｄ２）に２つのローラ嵌入空間をおいて３つ並んで構成されている。３つのガイド壁３２の下端間は連結底３８で連結され補強されているが、この連結底３８は必須ではない。ローラガイド３１の左右長は、ロッカアーム本体１０の第一側壁部１１と中間壁部１４との間よりも短く、リンクアーム２０の左右長は、ロッカアーム本体１０の第一側壁部１１と第二側壁部１２との間よりも短いので、リンクアーム２０は軸長方向ｄ１，ｄ２に変位可能となっている。 In the roller guide 31, a guide wall 32 having a notch 33 for escaping the displacement of the roller shaft 15 when rocking the rocker arm body is provided, and two roller fitting spaces are provided in the rocker shaft longitudinal direction (axial length directions d1 and d2). It consists of three side by side. The lower ends of the three guide walls 32 are connected and reinforced by a connecting bottom 38, but the connecting bottom 38 is not essential. The horizontal length of the roller guide 31 is shorter than that between the first side wall portion 11 and the intermediate wall portion 14 of the rocker arm body 10, and the left and right length of the link arm 20 is the first side wall portion 11 and the second side wall of the rocker arm body 10. Since it is shorter than the space between the portions 12, the link arm 20 can be displaced in the axial length directions d1 and d2.

（組み付け）
非回動部材２７の嵌入空間に回動部材２１の筒状基部２２が、ロッカシャフト長方向に相対変位しないように嵌入されて、リンクアーム２０が出来上がり、このリンクアーム２０がロッカアーム本体１０の第一側壁部１１と第二側壁部１２との間に入れられるとともに、ローラ嵌入空間にローラ１６が嵌入された状態で、上述のとおり、第一側壁部１１、第二側壁部１２、第一筒状部２８、第二筒状部２９、及び筒状基部２２にロッカシャフト９が通されている。 (Assembly)
The cylindrical base portion 22 of the rotating member 21 is fitted into the fitting space of the non-rotating member 27 so as not to be displaced relative to the rocker shaft length direction, and the link arm 20 is completed. As described above, the first side wall portion 11, the second side wall portion 12, and the first cylinder are inserted between the one side wall portion 11 and the second side wall portion 12, and the roller 16 is fitted in the roller fitting space. The rocker shaft 9 is passed through the tubular portion 28, the second tubular portion 29, and the tubular base portion 22.

そして、スリーブ３９が、非回動部材２７の長孔３５と回動部材２１の逃がし穴２６とを通されてロッカシャフト９に当てられ、該スリーブ３９にボルト３６が通されてロッカシャフト９に交差状に螺着されている。このスリーブ３９と長孔３５と逃がし穴２６の大小関係により、非回動部材２７はロッカシャフト周方向に回動不能且つロッカシャフト長方向に変位可能となっており、回動部材２１はロッカシャフト周方向に回動可能かつロッカシャフト長方向に変位可能となっている。 Then, the sleeve 39 is passed through the elongated hole 35 of the non-rotating member 27 and the relief hole 26 of the rotating member 21 and applied to the rocker shaft 9, and the bolt 39 is passed through the sleeve 39 to attach to the rocker shaft 9. It is screwed in a cross shape. Due to the size relationship among the sleeve 39, the long hole 35, and the escape hole 26, the non-rotating member 27 cannot rotate in the circumferential direction of the rocker shaft and can be displaced in the rocker shaft longitudinal direction. It is rotatable in the circumferential direction and displaceable in the length direction of the rocker shaft.

また、スリーブ３９の下端とボルト３６の頭部との間には、板バネからなる弾性部材３７が挟着されている。弾性部材３７と下連結部３０の下面との間には隙間があり、非回動部材２７のロッカシャフト長方向の変位を許容している。弾性部材３７は軸長方向ｄ１，ｄ２両側に延出し、各延出端部は、リンクアーム２０が軸長方向ｄ１，ｄ２に変位し終わったときに各係合段部３４に係合する抑制部を構成している。この係合により、リンクアーム２０の不要の変位（いずれの係入アーム２３，２４も螺旋溝５，７に係入していないときに、内燃機関の振動等で起こりうる。）が抑制される。 An elastic member 37 made of a leaf spring is sandwiched between the lower end of the sleeve 39 and the head of the bolt 36. There is a gap between the elastic member 37 and the lower surface of the lower connecting portion 30 to allow the non-rotating member 27 to be displaced in the length direction of the rocker shaft. The elastic member 37 extends on both sides in the axial length directions d1 and d2, and each extended end portion is restrained from engaging with each engagement step portion 34 when the link arm 20 is completely displaced in the axial length direction d1 and d2. Make up part. By this engagement, unnecessary displacement of the link arm 20 (which can occur due to vibration of the internal combustion engine when neither of the engagement arms 23 and 24 is engaged with the spiral grooves 5 and 7) is suppressed. ..

［回動装置］
回動装置４０は、図３、図５等に示すように、被押圧部２５の下部を前方へ押圧して回動部材２１を軸周方向一方ｒ１に回動させるための第一電磁ソレノイド４１と、被押圧部２５の上部を前方へ押圧して回動部材２１を軸周方向他方ｒ２に回動させるための第二電磁ソレノイド４２とからなる。各電磁ソレノイド４１，４２は、ＯＮによりロッドを繰出して回動部材２１を押圧し、ＯＦＦによりロッドを退入させて前記押圧を解除する。 [Rotating device]
As shown in FIGS. 3 and 5, the rotating device 40 presses the lower portion of the pressed portion 25 forward to rotate the rotating member 21 in the axial direction one direction r1. And a second electromagnetic solenoid 42 for pressing the upper portion of the pressed portion 25 forward to rotate the rotating member 21 in the other axial direction r2. Each of the electromagnetic solenoids 41, 42 feeds the rod to push the rotating member 21 when turned on, and retracts the rod when turned off to release the pushing.

以上のように構成された実施例の可変動弁機構１の可変動弁動作を説明する。
［１］ローラ１６を第一カム３が当接する位置に変位させるとき
図３、図４に示すように、第一電磁ソレノイド４１をＯＮにして、被押圧部２５の下部を前方へ押圧し、回動部材２１を軸周方向一方ｒ１に回動させる。このとき、非回動部材２７は回動しないので、回動部材２１の慣性質量は小さく、ローラガイド３１とローラ１６との接触は回動抵抗とならない。 The variable valve operation of the variable valve mechanism 1 of the embodiment configured as above will be described.
[1] When displacing the roller 16 to the position where the first cam 3 comes into contact: As shown in FIGS. 3 and 4, the first electromagnetic solenoid 41 is turned on to press the lower part of the pressed portion 25 forward, The rotating member 21 is rotated in one axial direction r1. At this time, since the non-rotating member 27 does not rotate, the inertial mass of the rotating member 21 is small, and the contact between the roller guide 31 and the roller 16 does not cause rotation resistance.

この回動部材２１の回動により、第一係入アーム２３の先端部が第一螺旋溝５に係入し、第二係入アーム２４の先端部が円環溝６から退出する。前記のとおり、第一螺旋溝５の螺旋状に延びる部分はベース円作用時に第一係入アーム２３が係入する位相にあるので、回動部材２１はカムシャフト２の回転に伴いベース円作用時に第一螺旋溝５に沿って軸長方向一方ｄ１に変位し、非回動部材２７及びローラ１６を押して同様に変位させる。その結果、２つのローラ１６は２つの第一カム３が当接する（且つ第二カム４が当接しない）位置に変位し、第一係入アーム２３が円環溝６に入ることでリンクアーム２０及びローラ１６の左右方向位置が保持される。 By the rotation of the rotating member 21, the tip end of the first engagement arm 23 engages with the first spiral groove 5, and the tip end of the second engagement arm 24 withdraws from the annular groove 6. As described above, the spirally extending portion of the first spiral groove 5 is in the phase in which the first engaging arm 23 is engaged during the base circle action, so that the rotating member 21 operates in accordance with the rotation of the camshaft 2. At some times, it is displaced along the first spiral groove 5 in the axial direction one side d1, and the non-rotating member 27 and the roller 16 are pushed to be displaced similarly. As a result, the two rollers 16 are displaced to the position where the two first cams 3 come into contact (and the second cam 4 does not come into contact), and the first engaging arm 23 enters the annular groove 6 so that the link arm The horizontal positions of 20 and the roller 16 are held.

そして、図４に示すように、第一カム３によりローラ１６が押圧されてロッカアーム本体１０が揺動し、第一カム３により、バルブＶが高リフトかつ狭作用角でリフトされる。この動弁モードは、主に高速回転域で使用される。 Then, as shown in FIG. 4, the roller 16 is pressed by the first cam 3 to rock the rocker arm body 10, and the valve V is lifted by the first cam 3 with a high lift and a narrow working angle. This valve operating mode is mainly used in a high speed rotation range.

［２］ローラ１６を第二カム４が当接する位置に変位させるとき
図５、図６に示すように、第二電磁ソレノイド４２をＯＮにして、被押圧部２５の上部を前方へ押圧し、回動部材２１を軸周方向他方ｒ２に回動させる。このとき、非回動部材２７は回動しないので、回動部材２１の慣性質量は小さく、ローラガイド３１とローラ１６との接触は回動抵抗とならない。 [2] When the roller 16 is displaced to the position where the second cam 4 comes into contact As shown in FIGS. 5 and 6, the second electromagnetic solenoid 42 is turned on to press the upper portion of the pressed portion 25 forward, The rotating member 21 is rotated in the other axial direction r2. At this time, since the non-rotating member 27 does not rotate, the inertial mass of the rotating member 21 is small, and the contact between the roller guide 31 and the roller 16 does not cause rotation resistance.

この回動部材２１の回動により、第二係入アーム２４の先端部が第二螺旋溝７に係入し、第一係入アーム２３の先端部が円環溝６から退出する。前記のとおり、第二螺旋溝７の螺旋状に延びる部分はベース円作用時に第二係入アーム２４が係入する位相にあるので、回動部材２１はカムシャフト２の回転に伴いベース円作用時に第二螺旋溝７に沿って軸長方向他方ｄ１に変位し、非回動部材２７及びローラ１６を押して同様に変位させる。その結果、２つのローラ１６は２つの第二カム４が当接する（且つ第一カム３が当接しない）位置に変位し、第二係入アーム２４が円環溝６に入ることでリンクアーム２０及びローラ１６の左右方向位置が保持される。 By the rotation of the rotating member 21, the tip end of the second engagement arm 24 engages with the second spiral groove 7, and the tip end of the first engagement arm 23 withdraws from the annular groove 6. As described above, the spirally extending portion of the second spiral groove 7 is in the phase in which the second engaging arm 24 is engaged during the base circle action, so that the rotating member 21 moves along with the rotation of the camshaft 2 to the base circle action. Sometimes, it is displaced along the second spiral groove 7 in the other axial direction d1, and the non-rotating member 27 and the roller 16 are pushed to be displaced in the same manner. As a result, the two rollers 16 are displaced to the position where the two second cams 4 come into contact (and the first cam 3 does not come into contact), and the second engaging arm 24 enters the annular groove 6 so that the link arm The horizontal positions of 20 and the roller 16 are held.

そして、図６に示すように、第二カム４によりローラ１６が押圧されてロッカアーム本体１０が揺動し、バルブＶが低リフトかつ広作用角でリフトされる。この動弁モードは、主に低速回転域で使用される。 Then, as shown in FIG. 6, the roller 16 is pressed by the second cam 4 to rock the rocker arm body 10, and the valve V is lifted with a low lift and a wide working angle. This valve operating mode is mainly used in the low speed rotation range.

本実施例によれば、リンクアーム２０の回動部分である回動部材２１の慣性質量を低減でき、また回動部材２１がローラ１６と摺接しないようにでき、もって回動装置４０が要する駆動力を低減することができる。回動装置４０として例えば電磁ソレノイドを用いる場合には、容量の小さい小型の電磁ソレノイドで済み、内燃機関の小型化や、電力消費減少による燃費向上が期待できる。 According to the present embodiment, the inertial mass of the rotating member 21 that is the rotating portion of the link arm 20 can be reduced, and the rotating member 21 can be prevented from sliding contact with the roller 16, so that the rotating device 40 is required. The driving force can be reduced. When an electromagnetic solenoid is used as the turning device 40, for example, a small electromagnetic solenoid having a small capacity is sufficient, and it is expected that the internal combustion engine can be downsized and fuel consumption can be improved by reducing power consumption.

なお、本発明は前記実施例に限定されるものではなく、例えば次のように、発明の趣旨から逸脱しない範囲で適宜変更して具体化することができる。
（１）第一カム３及び第二カム４をそれぞれ１つにし、ローラ１６を１つにすること。 It should be noted that the present invention is not limited to the above-described embodiments, and can be embodied with appropriate modifications, for example, as follows, without departing from the spirit of the invention.
(1) One each of the first cam 3 and the second cam 4 and one roller 16.

１ 可変動弁機構
２ カムシャフト
２ リンクアーム
３ 第一カム
４ 第二カム
５ 第一螺旋溝
６ 円環溝
７ 第二螺旋溝
９ ロッカシャフト
１０ ロッカアーム本体
１５ ローラ軸
１７ ローラ
２０ リンクアーム
２１ 回動部材
２２ 筒状基部
２３ 第一係入アーム
２４ 第二係入アーム
２５ 被押圧部
２６ 逃がし穴
２７ 非回動部材
２８ 第一筒状部
２９ 第二筒状部
３０ 下連結部
３１ ローラガイド
３２ ガイド壁
３３ 切欠
３５ 長孔
３６ ボルト
４０ 回動装置
４１ 第一電磁ソレノイド
４２ 第二電磁ソレノイド
ｄ１ 軸長方向一方
ｄ２ 軸長方向他方
ｒ１ 軸周方向一方
ｒ２ 軸周方向他方 1 Variable Valve Mechanism 2 Cam Shaft 2 Link Arm 3 First Cam 4 Second Cam 5 First Spiral Groove 6 Annular Groove 7 Second Spiral Groove 9 Rocker Shaft 10 Rocker Arm Main Body 15 Roller Shaft 17 Roller 20 Link Arm 21 Rotation Member 22 Cylindrical base 23 First engagement arm 24 Second engagement arm 25 Pressed portion 26 Relief hole 27 Non-rotating member 28 First tubular portion 29 Second tubular portion 30 Lower connection portion 31 Roller guide 32 Guide Wall 33 Notch 35 Long hole 36 Bolt 40 Rotating device 41 First electromagnetic solenoid 42 Second electromagnetic solenoid d1 One axial length direction d2 Other axial length direction r1 One axial circumferential direction r2 Another axial circumferential direction

Claims (6)

カムシャフト（２）に、カム（３）と２つの螺旋溝（５，７）とが設けられ、
カムシャフト（２）と平行に延びるロッカシャフト（９）に、ロッカアーム本体（１０）が揺動可能に支持され、
ロッカアーム本体（１０）に、ロッカシャフト（９）と平行に延びるローラ軸（１５）が設けられ、
ローラ軸（１５）に、カム（３）が当接しうるローラ（１６）がロッカシャフト長方向に変位可能に支持され、
２つの螺旋溝（５，７）に択一的に係入する２つの係入アーム（２３，２４）とローラ（１６）の両側面を抱持するローラガイド（３１）とを含むリンクアーム（２０）が、ロッカシャフト長方向に変位可能に設けられ、
２つの係入アーム（２３，２４）を回動装置（４０）により回動させて、一方の係入アーム（２３）を一方の螺旋溝（５）に係入させるか又は他方の係入アーム（２４）を他方の螺旋溝（７）に係入させるかを選択することにより、選択した螺旋溝（５，７）に沿ってリンクアーム（２０）及びローラ（１６）をロッカシャフト長方向に変位させて、該ローラ（１６）に前記カム（３）が当接するか又は当接しないかを切り替える内燃機関の可変動弁機構において、
リンクアーム（２０）が、回動装置（４０）により回動する、２つの係入アーム（２３，２４）を含む回動部材（２１）と、回動装置（４０）により回動しない、ローラガイド（３１）を含む非回動部材（２７）とに、分割形成されていることを特徴とする内燃機関の可変動弁機構。 The cam shaft (2) is provided with a cam (3) and two spiral grooves (5, 7),
A rocker arm body (10) is swingably supported by a rocker shaft (9) extending parallel to the cam shaft (2),
The rocker arm body (10) is provided with a roller shaft (15) extending parallel to the rocker shaft (9),
A roller (16) on which the cam (3) can abut is supported by the roller shaft (15) so as to be displaceable in the rocker shaft longitudinal direction,
A link arm (2) including two engaging arms (23, 24) selectively engaged in the two spiral grooves (5, 7) and a roller guide (31) for holding both side surfaces of the roller (16). 20) is provided so as to be displaceable in the length direction of the rocker shaft,
The two engaging arms (23, 24) are rotated by the rotating device (40) so that one of the engaging arms (23) is engaged with the one spiral groove (5) or the other engaging arm. By selecting whether (24) is engaged with the other spiral groove (7), the link arm (20) and the roller (16) are moved in the rocker shaft longitudinal direction along the selected spiral groove (5, 7). In a variable valve mechanism for an internal combustion engine, which is displaced to switch between contact and non-contact of the cam (3) with the roller (16),
A link arm (20) is a rotating member (21) including two engaging arms (23, 24) which is rotated by a rotating device (40), and a roller which is not rotated by the rotating device (40). A variable valve mechanism for an internal combustion engine, wherein the variable valve mechanism is divided into a non-rotating member (27) including a guide (31). 回動部材（２１）は、ロッカシャフト（９）に、ロッカシャフト周方向に回動可能に且つロッカシャフト長方向にスライド変位可能に外嵌されている請求項１記載の内燃機関の可変動弁機構。 The variable valve of the internal combustion engine according to claim 1, wherein the rotating member (21) is externally fitted to the rocker shaft (9) so as to be rotatable in the circumferential direction of the rocker shaft and slidable in the longitudinal direction of the rocker shaft. mechanism. 非回動部材（２７）は、ロッカシャフト（９）に、ロッカシャフト長方向に変位可能に外嵌され、ロッカシャフト周方向に回動不能となっている請求項１又は２記載の内燃機関の可変動弁機構。 The internal combustion engine according to claim 1 or 2, wherein the non-rotating member (27) is fitted onto the rocker shaft (9) so as to be displaceable in the rocker shaft longitudinal direction, and is non-rotatable in the rocker shaft circumferential direction. Variable valve mechanism. 回動部材（２１）は、非回動部材（２７）に、ロッカシャフト長方向に相対変位しないように嵌入している請求項１〜３のいずれか一項に記載の内燃機関の可変動弁機構。 The variable valve for an internal combustion engine according to any one of claims 1 to 3, wherein the rotating member (21) is fitted into the non-rotating member (27) so as not to be displaced relative to the rocker shaft length direction. mechanism. ローラガイド（３１）は、ロッカアーム本体揺動時のローラ軸（１５）の動きを逃がす切欠（３３）が形成されたガイド壁（３２）が、ロッカシャフト長方向にローラ嵌入空間をおいて少なくとも２つ並んで構成されている請求項１〜４のいずれか一項に記載の内燃機関の可変動弁機構。 In the roller guide (31), a guide wall (32) having a notch (33) for allowing the movement of the roller shaft (15) when rocking the rocker arm main body is formed has a roller fitting space at least 2 in the length direction of the rocker shaft. The variable valve mechanism for an internal combustion engine according to any one of claims 1 to 4, which is arranged side by side. 回動装置（４０）は、電磁ソレノイド（４１，４２）からなるものである請求項請求項１〜５のいずれか一項に記載の内燃機関の可変動弁機構。 The variable valve mechanism for an internal combustion engine according to any one of claims 1 to 5, wherein the rotating device (40) is composed of an electromagnetic solenoid (41, 42).
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JP2010275935A (en) * 2009-05-28 2010-12-09 Toyota Motor Corp Variable valve apparatus for internal combustion engine
JP2011122498A (en) * 2009-12-09 2011-06-23 Otics Corp Variable valve train
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