JP2001234722A - Variable valve system of internal combustion engine - Google Patents
Variable valve system of internal combustion engineInfo
- Publication number
- JP2001234722A JP2001234722A JP2000271957A JP2000271957A JP2001234722A JP 2001234722 A JP2001234722 A JP 2001234722A JP 2000271957 A JP2000271957 A JP 2000271957A JP 2000271957 A JP2000271957 A JP 2000271957A JP 2001234722 A JP2001234722 A JP 2001234722A
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- Japan
- Prior art keywords
- sub
- face
- cam
- rear end
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Valve Device For Special Equipments (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、内燃機関の可変動
弁機構に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable valve mechanism for an internal combustion engine.
【０００２】[0002]
【従来の技術】カムシャフトに配置された第一カム及び
第二カムと、第一カム及び第二カムと吸気弁との間に介
在するスイングアームのような動作伝達部材とを具備
し、選択された一方のカム動作によって吸気弁又は排気
弁を開弁する可変動弁機構が公知である。例えば、第一
カムは吸気弁の低リフトを実現するための低リフトカム
であり、第二カムは吸気弁の高リフトを実現するための
高リフトカムであり、動作伝達部材は、回動軸線に沿っ
て互いに隣接し、第一カムにより回動させられて吸気弁
に当接する主部分と、第二カムにより回動させられて主
部分へ連結可能な副部分とを有している。2. Description of the Related Art A first and second cams disposed on a camshaft and an operation transmitting member such as a swing arm interposed between the first and second cams and an intake valve are provided. A variable valve mechanism that opens an intake valve or an exhaust valve by one of the cam operations performed is known. For example, the first cam is a low-lift cam for achieving a low lift of the intake valve, the second cam is a high-lift cam for achieving a high lift of the intake valve, and the operation transmitting member extends along the rotation axis. And has a main portion rotated by the first cam and abutting on the intake valve, and a sub-portion rotated by the second cam and connectable to the main portion.
【０００３】副部分を主部分へ連結すれば、高リフトカ
ムが副部分を介して主部分を作動させ、吸気弁は、高リ
フトで開弁させられる。この時、低リフトカムの山部は
主部分とは非当接となる。一方、副部分を主部分から切
り離せば、高リフトカムは副部分を作動させるが、副部
分の動作は吸気弁へ伝達されず、吸気弁は、低リフトカ
ムによる主部分の作動によって、低リフトで開弁させら
れる。こうして、機関高速時に適した吸気弁の高リフト
と、機関低速時に適した吸気弁の低リフトとを実現可能
となる。When the sub-portion is connected to the main portion, the high-lift cam operates the main portion via the sub-portion, and the intake valve is opened at a high lift. At this time, the peak portion of the low lift cam does not contact the main portion. On the other hand, if the sub-portion is separated from the main portion, the high-lift cam operates the sub-portion, but the operation of the sub-portion is not transmitted to the intake valve, and the intake valve is opened at low lift by the operation of the main portion by the low-lift cam. It is made to valve. Thus, it is possible to realize a high lift of the intake valve suitable for a high speed of the engine and a low lift of the intake valve suitable for a low speed of the engine.
【０００４】このような可変動弁機構において、一般的
に、動作伝達部材の主部分と副部分とは、互いに回動軸
線に垂直な摺動面を有し、一方の摺動面に形成された穴
内へ他方の摺動面からピンを突出させることにより互い
に連結され、ピンを引っ込めることにより結合解除され
る。このような連結構造においては、連結時において、
ピンに剪断力又は曲げ力が作用し、ピンに高い強度が必
要とされ、ピンの大型化等の問題が発生する。[0004] In such a variable valve mechanism, the main part and the sub part of the operation transmitting member generally have sliding surfaces perpendicular to the rotation axis, and are formed on one sliding surface. The pins are connected to each other by projecting the pins from the other sliding surface into the bores, and disengaged by retracting the pins. In such a connection structure, at the time of connection,
A shear force or a bending force acts on the pin, and the pin needs to have high strength, which causes a problem such as enlargement of the pin.
【０００５】特開平１０−２２０２１０号公報に開示さ
れている可変動弁機構は、動作伝達部材の主部分と副部
分とが、それぞれ、互いに向けて回動軸線方向に突出す
る突出部を有し、各突出部には回動軸線に平行で互いに
対向する対向面が設けられ、各対向面は、副部分が第二
カムによって回動させられる時に互いに接近するように
なっている。主部分及び副部分の一方から各対向面の間
にピンを押し出せば、高リフトカムによる副部分の回動
動作が主部分へ伝達されて吸気弁を高リフトで開弁し、
各対向面の間からピンを引っ込めれば、高リフトカムに
よる副部分の回動動作は、各対向面を接近させるが、主
部分へは伝達されず、低リフトカムによる主部分の回動
動作によって吸気弁は低リフトで開弁する。それによ
り、ピンには、剪断力及び曲げ力ではなく、圧縮力だけ
が作用し、一般的な材料は圧縮力に対しては非常に強い
ために、ピンの大型化の問題を解決することができる。In the variable valve mechanism disclosed in Japanese Patent Application Laid-Open No. H10-220210, a main portion and a sub-portion of an operation transmitting member each have a protruding portion that protrudes toward each other in a rotation axis direction. Each protruding portion is provided with opposing surfaces parallel to the rotation axis and facing each other, and the opposing surfaces approach each other when the sub-portion is rotated by the second cam. If a pin is pushed out between each facing surface from one of the main part and the sub part, the rotation operation of the sub part by the high lift cam is transmitted to the main part, and the intake valve is opened with a high lift,
If the pin is retracted from between the opposing surfaces, the rotation of the sub-portion by the high lift cam causes the opposing surfaces to approach each other, but is not transmitted to the main portion. The valve opens with a low lift. Therefore, only the compressive force acts on the pin, not the shearing force and the bending force. Since the general material is very strong against the compressive force, it is possible to solve the problem of increasing the size of the pin. it can.
【０００６】[0006]
【発明が解決しようとする課題】前述の従来技術におい
て、ピンを押し出して高リフトカムにより吸気弁を作動
し続ける際に、バルブスプリングのサージング等によっ
て、動作伝達部材の主部分は、突出部対向面がピンから
離れるように、異常に回動し、それにより、吸気弁が異
常に押し下げられて閉弁時に破損したり、反動によって
主部分の突出部対向面がピンに激しく衝突し、主部分及
びピンが破損する可能性がある。In the above-mentioned prior art, when the pin is pushed out and the intake valve is continuously operated by the high lift cam, the main part of the operation transmitting member is formed by the surging of the valve spring or the like. Abnormally pivots away from the pin, whereby the intake valve is abnormally pushed down and is broken when the valve is closed, or the reaction of the main part protrudingly facing the pin violently collides with the pin due to reaction, and the main part and The pins may be damaged.
【０００７】従って、本発明の目的は、主部分と副部分
とを有する動作伝達部材を具備し、主部分の突出部端面
と副部分の突出部端面との間に介在部材を押し出すこと
により、カムによる副部分の回動動作を主部分を介して
吸気弁又は排気弁へ伝達可能な可変動弁機構において、
バルブスプリングのサージング等による主部分の異常回
動を防止することである。Accordingly, an object of the present invention is to provide an operation transmitting member having a main portion and a sub-portion, and extruding an intervening member between the protruding end surface of the main portion and the protruding end surface of the sub-portion. In a variable valve mechanism capable of transmitting a rotation operation of a sub part by a cam to an intake valve or an exhaust valve via a main part,
An object of the present invention is to prevent abnormal rotation of a main portion due to surge of a valve spring or the like.
【０００８】[0008]
【課題を解決するための手段】本発明による請求項１に
記載の内燃機関の可変動弁機構は、第一カム及び第二カ
ムと、動作伝達部材とを具備し、前記動作伝達部材は、
前記第一カムにより回動させられて吸気弁又は排気弁に
当接する主部分と、前記第二カムにより回動させられる
副部分とを有し、前記主部分と前記副部分とは少なくと
も互いに平行なそれぞれの回動軸線方向に互いに隣接
し、前記主部分は、前記副部分へ向けて前記回動軸線方
向に突出する第一突出部を有し、前記副部分は、前記主
部分へ向けて前記回動軸線方向に突出する第二突出部を
有し、前記第一突出部は、前記主部分の前記吸気弁又は
排気弁の開弁への回動方向における第一前側端面と第一
後側端面とを有し、前記第二突出部は、前記副部分の前
記吸気弁又は排気弁の開弁への回動方向における第二前
側端面と第二後側端面とを有し、前記第一前側端面と前
記第二後側端面とは互いに対向し、前記第一後側端面と
前記第二前側端面とは互いに対向し、前記第一後側端面
と前記第二前側端面との間へ押し出し可能な介在部材が
設けられ、前記介在部材が押し出されていない時には、
前記第一副部分は前記主部分に対して自由に回動し、前
記介在部材が押し出された時には、前記第二カムによる
前記副部分の回動動作は、前記吸気弁又は排気弁を開弁
するために、前記介在部材を介して前記主部分へ伝達さ
れると共に、前記第一前側端面は前記第二後側端面にほ
ぼ当接していることを特徴とする。According to the first aspect of the present invention, there is provided a variable valve mechanism for an internal combustion engine comprising a first cam and a second cam, and an operation transmitting member, wherein the operation transmitting member comprises
It has a main part rotated by the first cam and abutting on an intake valve or an exhaust valve, and a sub part rotated by the second cam, and the main part and the sub part are at least parallel to each other. The main portion has a first protrusion protruding in the direction of the rotation axis toward the sub-portion, and the sub-portion is directed toward the main portion. A second protruding portion that protrudes in the direction of the rotation axis, wherein the first protruding portion has a first front end surface and a first rear end in a direction in which the main portion rotates to open the intake valve or the exhaust valve. A side end surface, the second protrusion has a second front end surface and a second rear end surface in a rotation direction of the sub-portion to open the intake valve or the exhaust valve, and One front end face and the second rear end face face each other, and the first rear end face and the second front end face. Face each other, wherein the intervening member can be extrusion to between provided between the first rear end surface and the second front-side end face, when said intermediate member is not pushed out,
The first sub-portion pivots freely with respect to the main portion, and when the intervening member is pushed out, the pivoting operation of the sub-portion by the second cam opens the intake valve or the exhaust valve. The first front end face is substantially in contact with the second rear end face while being transmitted to the main portion via the intervening member.
【０００９】また、本発明による請求項２に記載の内燃
機関の可変動弁機構は、第一カム、第二カム及び第三カ
ムと、動作伝達部材とを具備し、前記動作伝達部材は、
前記第一カムにより回動させられて吸気弁又は排気弁に
当接する主部分と、前記第二カムにより回動させられる
第一副部分とを有し、前記主部分と前記第一副部分とは
少なくとも互いに平行なそれぞれの回動軸線方向に互い
に隣接し、前記主部分は、前記第一副部分へ向けて前記
回動軸線方向に突出する第一突出部を有し、前記第一副
部分は、前記主部分へ向けて前記回動軸線方向に突出す
る第二突出部を有し、前記第一突出部は、前記主部分の
前記吸気弁又は排気弁の開弁への回動方向における第一
前側端面と第一後側端面とを有し、前記第二突出部は、
前記第一副部分の前記吸気弁又は排気弁の開弁への回動
方向における第二前側端面と第二後側端面とを有し、前
記第一後側端面と前記第二前側端面とは互いに対向し、
前記第一後側端面と前記第二前側端面との間へ押し出し
可能な第一介在部材が設けられ、前記第一介在部材が押
し出されていない時には、前記第一副部分は前記主部分
に対して自由に回動し、前記第一介在部材が押し出され
た時には、前記第二カムによる前記第一副部分の回動動
作は、前記吸気弁又は排気弁を開弁するために、前記第
一介在部材を介して前記主部分へ伝達され、前記第三カ
ムは前記第二カムの形状より外側に突出しない形状を有
し、前記動作伝達部材は、前記第三カムにより回動させ
られる第二副部分を有し、前記主部分と前記第二副部分
とは少なくとも互いに平行なそれぞれの回動軸線方向に
互いに隣接し、前記主部分は、前記第二副部分へ向けて
前記回動軸線方向に突出する第三突出部を有し、前記副
部分は、前記主部分へ向けて前記回動軸線方向に突出す
る第四突出部を有し、前記第三突出部は、前記主部分の
前記吸気弁又は排気弁の開弁への回動方向における第三
前側端面と第三後側端面とを有し、前記第四突出部は、
前記第二副部分の前記吸気弁又は排気弁の開弁への回動
方向における第四前側端面と第四後側端面とを有し、前
記第三後側端面と前記第四前側端面とは互いに対向し、
前記第三後側端面と前記第四前側端面との間へ押し出し
可能な第二介在部材が設けられ、前記第二介在部材が押
し出されていない時には、前記第二副部分は前記主部分
に対して自由に回動し、前記第二介在部材が押し出され
た時には、前記第三カムによる前記第二副部分の回動動
作は、前記吸気弁又は排気弁を開弁するために、前記第
二介在部材を介して前記主部分へ伝達されると共に、前
記第三前側端面は前記第四後側端面から離間し、前記第
一介在部材及び前記第二介在部材がいずれも押し出され
ている時に、前記第二カムによる前記第一副部材の回動
動作が前記第二副部材へ伝達されないようになっている
ことを特徴とする。According to a second aspect of the present invention, there is provided a variable valve mechanism for an internal combustion engine comprising a first cam, a second cam, a third cam, and an operation transmitting member, wherein the operation transmitting member is
A main portion rotated by the first cam and abutting on an intake valve or an exhaust valve, and a first sub-portion rotated by the second cam; the main portion and the first sub-portion; Are at least adjacent to each other in respective rotation axis directions parallel to each other, and the main portion has a first protrusion protruding in the rotation axis direction toward the first sub-portion, and the first sub-portion Has a second protruding portion that protrudes in the rotation axis direction toward the main portion, and the first protruding portion is in a direction in which the main portion is rotated to open the intake valve or the exhaust valve. It has a first front end surface and a first rear end surface, and the second protrusion is
The first sub-portion has a second front end surface and a second rear end surface in a rotation direction of the intake valve or the exhaust valve to open, and the first rear end surface and the second front end surface are Facing each other,
A first interposed member that can be extruded between the first rear end surface and the second front end surface is provided, and when the first interposed member is not extruded, the first sub-portion is relative to the main portion. When the first intervening member is pushed out and the first intervening member is pushed out, the rotation of the first sub-portion by the second cam causes the first valve to open the intake valve or the exhaust valve. The third cam is transmitted to the main portion via an intervening member, the third cam has a shape that does not protrude outside the shape of the second cam, and the operation transmitting member is rotated by the third cam. A sub-portion, wherein the main portion and the second sub-portion are adjacent to each other at least in respective rotation axis directions parallel to each other, and the main portion is in the rotation axis direction toward the second sub-portion. A sub-portion, the sub-portion protruding from the main portion A fourth protruding portion protruding in the direction of the rotation axis toward the third protruding portion, and the third protruding portion has a third front end face in a direction of rotation of the main portion to open the intake valve or the exhaust valve. A third rear end surface, and the fourth protrusion is
A fourth front end face and a fourth rear end face in the direction of rotation of the intake valve or the exhaust valve of the second sub-portion toward opening are provided, and the third rear end face and the fourth front end face are Facing each other,
A second interposed member that can be extruded between the third rear end surface and the fourth front end surface is provided, and when the second interposed member is not extruded, the second sub-portion is relative to the main portion. When the second intervening member is pushed out and the second intervening member is pushed out, the turning operation of the second sub-portion by the third cam causes the second valve to open the intake valve or the exhaust valve. While being transmitted to the main portion via the interposed member, the third front end surface is separated from the fourth rear end surface, and when the first interposed member and the second interposed member are both extruded, The rotation movement of the first sub-member by the second cam is not transmitted to the second sub-member.
【００１０】[0010]
【発明の実施の形態】図１は本発明による内燃機関の可
変動弁機構における実施形態を示す側面図であり、図２
は同平面図であり、図３は同分解斜視図である。これら
の図において、１は吸気弁又は排気弁（以下、バルブと
称する）であり、１ａはバルブ１を閉弁方向に付勢する
バルブスプリングである（図２及び図３においては省略
されている）。２はカムシャフトであり、３１はカムシ
ャフト２に配置された第一カムである。カムシャフト２
には、第一カム３１の両側において、第二カム３２及び
第三カム３３が配置されている。FIG. 1 is a side view showing an embodiment of a variable valve mechanism of an internal combustion engine according to the present invention, and FIG.
Is a plan view of the same, and FIG. 3 is an exploded perspective view of the same. In these figures, 1 is an intake valve or an exhaust valve (hereinafter, referred to as a valve), and 1a is a valve spring that biases the valve 1 in a valve closing direction (omitted in FIGS. 2 and 3). ). Reference numeral 2 denotes a camshaft, and 31 denotes a first cam arranged on the camshaft 2. Camshaft 2
, A second cam 32 and a third cam 33 are arranged on both sides of the first cam 31.
【００１１】４は各カム３１〜３３の動作をバルブへ伝
達するロッカアーム及びスイングアーム等の動作伝達部
材である。動作伝達部材４は、いずれも共通の回動軸５
回りに回動する主部分４１、第一副部分４２、及び第二
副部分４３を有している。第一副部分４２及び第二副部
分４３は、主部分４１に対して回動軸５の回動軸線方向
に沿って両側に隣接している。主部分４１、第一副部分
４２、及び第二副部分４３は、それぞれ、第一カム３
１、第二カム３２、及び第三カム３３に当接するための
ローラＲを有している。主部分４２には、二つのバルブ
１に同時に当接する押圧アーム４１ａが設けられてい
る。Reference numeral 4 denotes an operation transmitting member such as a rocker arm and a swing arm for transmitting the operation of each of the cams 31 to 33 to the valve. The operation transmitting member 4 includes a common rotating shaft 5.
It has a main part 41 rotating around, a first sub part 42 and a second sub part 43. The first sub-portion 42 and the second sub-portion 43 are adjacent to the main portion 41 on both sides along the rotation axis direction of the rotation shaft 5. The main portion 41, the first sub-portion 42, and the second sub-portion 43 are each
1, a roller R for contacting the second cam 32 and the third cam 33 is provided. The main part 42 is provided with a pressing arm 41a that comes into contact with the two valves 1 at the same time.
【００１２】図３に示すように、主部分４１は、第一副
部分４２へ向けて回動軸線方向に突出する第一突出部４
１ｂを有し、第一副部分４２は、主部分４１へ向けて回
動軸線方向に突出する第二突出部４２ｂを有している。
図４は、回動軸線に垂直で第一突出部４１ｂ及び第二突
出部４２ｂを通る断面図である。図４に示すように、第
一突出部４１ｂは、主部分４１のバルブ１の開弁への回
動方向（図３及び図４に矢印で示す）における第一前側
端面４１ｃと第一後側端面４１ｄとを有し、第二突出部
４２ｂは、第一副部分４２のバルブ１の開弁への回動方
向における第二前側端面４２ｃと第二後側端面４２ｄと
を有し、第一前側端面４１ｃと第二後側端面４２ｄとは
互いに対向し、第一後側端面４１ｄと第二前側端面４２
ｃとは互いに対向している。As shown in FIG. 3, the main portion 41 has a first protruding portion 4 protruding toward the first sub-portion 42 in the rotation axis direction.
1b, and the first sub-portion 42 has a second protrusion 42b protruding toward the main portion 41 in the rotation axis direction.
FIG. 4 is a cross-sectional view perpendicular to the rotation axis and passing through the first protrusion 41b and the second protrusion 42b. As shown in FIG. 4, the first protruding portion 41 b is formed by a first front end surface 41 c and a first rear side in a rotation direction (indicated by an arrow in FIGS. 3 and 4) of the main portion 41 when the valve 1 is opened. The second protruding portion 42b has a second front end surface 42c and a second rear end surface 42d in the rotation direction of the first sub-portion 42 when the valve 1 is opened. The front end face 41c and the second rear end face 42d face each other, and the first rear end face 41d and the second front end face 42d.
and c face each other.
【００１３】第一後側端面４１ｄと第二前側端面４２ｃ
との間にはピンのような第一介在部材４４が設けられて
いる。図４のＡ−Ａ断面図である図５に示すように、第
一介在部材４４は、バネ４５によって第一後側端面４１
ｄと第二前側端面４２ｃとの間から第一副部分４２内へ
引っ込むように付勢されている。一方、第一副部分４２
内の圧力室４６内に油圧が作用する時には、第一介在部
材４４における押し出し側の受圧面積と引っ込め側の受
圧面積との差により発生する押し出し力によって、第一
介在部材４４はバネ４５に逆らって第一後側端面４１ｄ
と第二前側端面４２ｃとの間へ押し出されるようになっ
ている。The first rear end face 41d and the second front end face 42c
A first intervening member 44 such as a pin is provided between the two. As shown in FIG. 5, which is a cross-sectional view taken along the line AA in FIG. 4, the first intervening member 44 is
It is urged to retract into the first sub-portion 42 from between d and the second front end surface 42c. On the other hand, the first sub-portion 42
When hydraulic pressure acts in the internal pressure chamber 46, the first intervening member 44 is opposed to the spring 45 by the pushing force generated by the difference between the pressure receiving area on the pushing side and the pressure receiving area on the retraction side in the first intervening member 44. The first rear end face 41d
And the second front end surface 42c.
【００１４】動作伝達部材４の主部分４１は、前述した
ように、バルブ１に当接する押圧アーム４１ａを有して
いるために、バルブスプリング１ａによって、バルブ１
の閉弁への回動方向に付勢されている。一方、第一副部
分４２及び第二副部分４３も、それぞれ、バネ４７及び
４８によって、バルブ１の閉弁への回動方向に付勢され
ている。As described above, since the main portion 41 of the operation transmitting member 4 has the pressing arm 41a which comes into contact with the valve 1, the valve spring 1a causes
Are biased in the direction of rotation toward the valve closing. On the other hand, the first sub-portion 42 and the second sub-portion 43 are also urged by the springs 47 and 48 in the rotation direction of the valve 1 to close.
【００１５】主部分４１の第一突出部４１ｂ及び第一副
部分４２の第二突出部４２ｂは、バルブスプリング１ａ
及びバネ４７による前述の付勢によって、第一カム３１
及び第二カム３２が主部分４１及び第一副部分４２を作
動しない時には、図４に示すように、第一突出部４１ｂ
の第一後側端面４１ｄと第二突出部４２ｂの第二前側端
面４２ｃとの間に、第一介在部材４４の押し出しを可能
とする隙間がもたらされると共に、第一突出部４１ｂの
第一前側端面４１ｃと第二突出部４２ｂの第二後側端面
４２ｄとは互いに当接するように形成されている。The first projecting portion 41b of the main portion 41 and the second projecting portion 42b of the first sub-portion 42 are connected to the valve spring 1a.
And the first cam 31 by the aforementioned biasing by the spring 47.
When the second cam 32 does not operate the main portion 41 and the first sub-portion 42, as shown in FIG.
Between the first rear end face 41d and the second front end face 42c of the second protrusion 42b, a gap is provided that allows the first interposition member 44 to be pushed out, and the first front side of the first protrusion 41b. The end face 41c and the second rear end face 42d of the second protrusion 42b are formed so as to abut each other.
【００１６】図１に示すように、第一カム３１は低リフ
トカムであり、第二カム３２は高リフトカムであり、第
一カム３１のカム形状は、第二カム３２のカム形状より
外側に突出していない。第一副部分４２内の油圧室４６
に油圧が作用していない時には、バネ４５によって第一
介在部材４４は第一副部分４２内へ引っ込められてい
る。それにより、バルブ１の閉弁方向において、第一副
部分４２は、第一カム３１によって回動させられる主部
分４１に比較して、第二カム３２によって大きく回動さ
せられるが、第一突出部４１ｂの第一後側端面４１ｄと
第二突出部４２ｂの第二前側端面４２ｃとの間の隙間に
よって、第一副部分４２は、主部分４１に対して自由に
回動し、第一副部分４２の動作が主部分４１へ伝達され
ることはなく、バルブ１は、第一カム３１による主部分
４１の回動動作によって低リフトで開弁させられる。As shown in FIG. 1, the first cam 31 is a low lift cam, the second cam 32 is a high lift cam, and the cam shape of the first cam 31 projects outward from the cam shape of the second cam 32. Not. Hydraulic chamber 46 in first sub-section 42
When the hydraulic pressure is not acting on the first intervening member 44, the first intervening member 44 is retracted into the first sub-portion 42 by the spring 45. As a result, in the valve closing direction of the valve 1, the first sub-portion 42 is turned by the second cam 32 more than the main portion 41 turned by the first cam 31, but the first projection Due to the gap between the first rear end surface 41d of the portion 41b and the second front end surface 42c of the second protrusion 42b, the first sub-portion 42 freely rotates with respect to the main portion 41, The operation of the portion 42 is not transmitted to the main portion 41, and the valve 1 is opened with a low lift by the rotation operation of the main portion 41 by the first cam 31.
【００１７】一方、第一副部分４２内の油圧室４６に油
圧が作用している時には、第一突出部４１ｂの第一後側
端面４１ｄと第二突出部４２ｂの第二前側端面４２ｃと
の間の隙間には、第一介在部材４４が押し出され、第二
カム３２による第一副部分の回動動作は第一介在部材４
４を介して主部分４１へ伝達される。それにより、第一
カム３１の山部は主部分４１に対して非接触となり、バ
ルブ１は第二カム３２によって高リフトで開弁させられ
る。この時、第一介在部材４４は、第一突出部４１ｂの
第一後側端面４１ｄと第二突出部４２ｂの第二前側端面
４２ｃとによって圧縮されることとなるが、一般的な材
料は、剪断及び曲げに比較して圧縮に対しては強く、第
一介在部材４４をそれほど大きくしなくても第一介在部
材４４が破損するようなことはない。On the other hand, when the hydraulic pressure is acting on the hydraulic chamber 46 in the first sub-portion 42, the first rear end face 41d of the first protrusion 41b and the second front end face 42c of the second protrusion 42b are in contact with each other. The first intervening member 44 is pushed out into the gap therebetween, and the rotation of the first sub-portion by the second cam 32 is performed by the first intervening member 4.
4 to the main part 41. Thereby, the peak portion of the first cam 31 comes into non-contact with the main portion 41, and the valve 1 is opened by the second cam 32 at a high lift. At this time, the first intervening member 44 is compressed by the first rear end surface 41d of the first protrusion 41b and the second front end surface 42c of the second protrusion 42b. It is more resistant to compression than shearing and bending, and the first intervening member 44 does not break even if the first intervening member 44 is not so large.
【００１８】本実施形態において、第一突出部４１ｂの
第一後側端面４１ｄ及び第二突出部４２ｂの第二前側端
面４２ｃは、圧縮時の応力集中を防止するために、それ
ぞれ、円形断面の第一介在部材４４に対して面接触する
ような凹部を有している。In the present embodiment, the first rear end face 41d of the first protrusion 41b and the second front end face 42c of the second protrusion 42b have circular cross sections in order to prevent stress concentration during compression. It has a concave portion that makes surface contact with the first intervening member 44.
【００１９】こうして、第一副部分４２を介してバルブ
１を高リフトで開弁している時に、一般的な可変動弁機
構では、主部分４１の第一突出部４１ｂにおける第一前
側端面４１ｃと第一副部分４２の第二突出部４２ｂにお
ける第二後側端面４２ｄとの間に比較的大きな隙間が存
在するために、バルブスプリング１ａのサージング等に
よって、主部分４１は、第一突出部４１ｂの第一後側端
面４１ｄが第一介在部材４４から離れるように、異常に
回動し、それにより、バルブ１が異常に押し下げられて
閉弁時に破損したり、反動によって主部分４１の第一突
出部４１ｂにおける第一後側端面４１ｄが第一介在部材
４４に激しく衝突し、第一突出部４１ｂ及び第一介在部
材４４が破損する可能性がある。Thus, when the valve 1 is opened at a high lift via the first sub-portion 42, a general variable valve mechanism employs a first front end face 41c of the first projection 41b of the main portion 41. Because there is a relatively large gap between the second protruding portion 42b of the first sub-portion 42 and the second rear end surface 42d of the first sub-portion 42, the main portion 41 is separated from the first protruding portion by the surging of the valve spring 1a. The first rear end face 41d of the first part 41b is abnormally rotated so as to be separated from the first intervening member 44, whereby the valve 1 is abnormally pushed down and broken at the time of closing, or the first part of the main part 41 is caused by a recoil. There is a possibility that the first rear end surface 41d of the one protruding portion 41b collides violently with the first intervening member 44, and the first protruding portion 41b and the first intervening member 44 are damaged.
【００２０】しかしながら、本実施形態では、第一副部
分４２を介してバルブ１を高リフトで開弁している時
に、主部分４１の第一突出部４１ｂにおける第一前側端
面４１ｃと第一副部分４２の第二突出部４２ｂにおける
第二後側端面４２ｄとは互いに当接しており、このよう
な主部分４１の異常回動が発生することはなく、第一突
出部４１ｂ及び第一介在部材４４の破損を防止すること
ができる。もちろん、主部分４１の第一突出部４１ｂに
おける第一前側端面４１ｃと第一副部分４２の第二突出
部４２ｂにおける第二後側端面４２ｄとの間の隙間が、
一般的な可変動弁機構とは異なり僅かであれば、バルブ
１が異常に押し下げられるような主部分４１の異常回動
を防止することができる。However, in this embodiment, when the valve 1 is opened at a high lift via the first sub-portion 42, the first front end face 41c of the first projecting portion 41b of the main portion 41 and the first sub-portion 41c The second rear end surface 42d of the second protruding portion 42b of the portion 42 is in contact with each other, and such abnormal rotation of the main portion 41 does not occur, and the first protruding portion 41b and the first intervening member 44 can be prevented from being damaged. Of course, the gap between the first front end face 41c of the first protrusion 41b of the main part 41 and the second rear end face 42d of the second protrusion 42b of the first sub part 42 is
Unlike a general variable valve mechanism, if it is small, abnormal rotation of the main part 41 such that the valve 1 is abnormally pushed down can be prevented.
【００２１】本実施形態において、第二副部分４３は、
図３及び図５に示すように、第一副部分４２と同様な構
成を有している。図６に示すように、主部分４１は、第
二副部分４３へ向けて回動軸線方向に突出する第三突出
部４１ｅを有し、第二副部分４３は、主部分４１へ向け
て回動軸線方向に突出する第四突出部４３ｂを有してい
る。図６は、回動軸線に垂直で第三突出部４１ｅ及び第
四突出部４３ｂを通る断面図である。図６に示すよう
に、第三突出部４１ｅは、主部分４１のバルブ１の開弁
への回動方向（図３及び図６に矢印で示す）における第
三前側端面４１ｆと第三後側端面４１ｇとを有し、第四
突出部４３ｂは、第二副部分４３のバルブ１の開弁への
回動方向における第四前側端面４３ｃと第四後側端面４
３ｄとを有し、第三前側端面４１ｆと第四後側端面４３
ｄとは互いに対向し、第三後側端面４１ｇと第四前側端
面４３ｃとは互いに対向している。In the present embodiment, the second sub-portion 43 is
As shown in FIGS. 3 and 5, it has a configuration similar to that of the first sub-portion 42. As shown in FIG. 6, the main portion 41 has a third protruding portion 41 e that protrudes in the rotation axis direction toward the second sub-portion 43, and the second sub-portion 43 rotates toward the main portion 41. It has a fourth protruding portion 43b that protrudes in the moving axis direction. FIG. 6 is a cross-sectional view perpendicular to the rotation axis and passing through the third protrusion 41e and the fourth protrusion 43b. As shown in FIG. 6, the third protruding portion 41 e includes a third front end surface 41 f and a third rear side in a rotation direction (indicated by an arrow in FIGS. 3 and 6) of the main portion 41 when the valve 1 is opened. The fourth protruding portion 43b has a fourth front end surface 43c and a fourth rear end surface 4c in the direction in which the second sub-portion 43 rotates to open the valve 1.
3d, a third front end face 41f and a fourth rear end face 43
d oppose each other, and the third rear end face 41g and the fourth front end face 43c oppose each other.
【００２２】第三後側端面４１ｇと第四前側端面４３ｃ
との間には前述したと同様な第二介在部材４４’が設け
られている。図５に示すように、第二介在部材４４’
は、バネ４５’によって第三後側端面４１ｇと第四前側
端面４３ｃとの間から第二副部分４３内へ引っ込むよう
に付勢されている。一方、第二副部分４３内の圧力室４
６’内に油圧が作用する時には、前述同様に、第二介在
部材４４’はバネ４５’に逆らって第三後側端面４１ｅ
と第四前側端面４３ｃとの間へ押し出されるようになっ
ている。The third rear end face 41g and the fourth front end face 43c
A second intervening member 44 'similar to that described above is provided between. As shown in FIG. 5, the second intervening member 44 '
Is biased by a spring 45 'so as to be retracted into the second sub-portion 43 from between the third rear end face 41g and the fourth front end face 43c. On the other hand, the pressure chamber 4 in the second sub-section 43
When the hydraulic pressure acts in the inside 6 ', as described above, the second intervening member 44' is opposed to the spring 45 'and the third rear end face 41e.
And the fourth front end face 43c.
【００２３】主部分４１の第三突出部４１ｅ及び第二副
部分４３の第四突出部４３ｂは、バルブスプリング１ａ
及びバネ４８による前述の付勢によって、第一カム３１
及び第三カム３３が主部分４１及び第二副部分４３を作
動しない時には、図６に示すように、第三突出部４１ｅ
の第三後側端面４１ｇと第四突出部４３ｂの第四前側端
面４３ｃとの間に、第二介在部材４４’の押し出しを可
能とする隙間がもたらされると共に、第三突出部４１ｅ
の第三前側端面４１ｆと第四突出部４３ｂの第四後側端
面４３ｄとは互いに離間するように形成されている。The third projecting portion 41e of the main portion 41 and the fourth projecting portion 43b of the second sub-portion 43 are connected to the valve spring 1a.
And the first cam 31 by the above-mentioned bias by the spring 48.
When the third cam 33 does not operate the main portion 41 and the second sub-portion 43, as shown in FIG.
A gap is provided between the third rear end face 41g and the fourth front end face 43c of the fourth protruding portion 43b so that the second intervening member 44 'can be pushed out, and the third protruding portion 41e is provided.
The third front end face 41f and the fourth rear end face 43d of the fourth protrusion 43b are formed so as to be separated from each other.
【００２４】第二副部分４３に当接する第三カム３３
は、図１に示すように、中リフトカムであり、第一カム
３１のカム形状は、第三カム３３のカム形状より外側に
突出していない。また、第三カム３３のカム形状は、第
二カム３２のカム形状より外側に突出していない。第二
副部分４３内の油圧室４６’に油圧が作用していない時
には、バネ４５’によって第二介在部材４４’は第二副
部分４３内へ引っ込められている。それにより、第三突
出部４１ｅの第三後側端面４１ｇと第四突出部４３ｂの
第四前側端面４３ｃとの間の隙間によって、第二副部分
４３は、主部分４１に対して自由に回動し、第二副部分
４２の動作が主部分４１へ伝達されることはない。一
方、第二副部分４３内の油圧室４６’に油圧が作用して
いる時には、第三突出部４１ｅの第三後側端面４１ｇと
第四突出部４３ｂの第四前側端面４３ｃとの間の隙間に
は、第二介在部材４４’が押し出され、第三カム３３に
よる第一副部分の回動動作は第二介在部材４４’を介し
て主部分４１へ伝達される。それにより、第一カム３１
の山部は主部分４１に対して非接触となり、バルブ１は
第三カム３３によって中リフトで開弁させられる。Third cam 33 abutting on second sub-portion 43
Is a middle lift cam, as shown in FIG. 1, and the cam shape of the first cam 31 does not protrude outside the cam shape of the third cam 33. The cam shape of the third cam 33 does not protrude outside the cam shape of the second cam 32. When no hydraulic pressure is acting on the hydraulic chamber 46 ′ in the second sub-portion 43, the second intervening member 44 ′ is retracted into the second sub-portion 43 by the spring 45 ′. Thereby, the second sub-portion 43 is freely rotated with respect to the main portion 41 by the gap between the third rear end surface 41g of the third protrusion 41e and the fourth front end surface 43c of the fourth protrusion 43b. The movement of the second sub-portion 42 is not transmitted to the main portion 41. On the other hand, when the hydraulic pressure is acting on the hydraulic chamber 46 ′ in the second sub-portion 43, the gap between the third rear end face 41 g of the third protrusion 41 e and the fourth front end face 43 c of the fourth protrusion 43 b is formed. The second intervening member 44 'is pushed into the gap, and the rotation of the first sub-portion by the third cam 33 is transmitted to the main portion 41 via the second intervening member 44'. Thereby, the first cam 31
Is not in contact with the main portion 41, and the valve 1 is opened by the third cam 33 with a medium lift.
【００２５】こうして、第一介在部材４４を押し出せ
ば、第二カム３２によって第一副部分４２を介してバル
ブ１を高リフトで開弁させることができ、第一介在部材
４４を引っ込めて第二介在部材４４’を押し出せば、第
三カム３３によって第二副部分４３を介してバルブ１を
中リフトで開弁させることができる。本実施形態では、
第三カム３３のカム形状は、第二カム３２のカム形状よ
り外側に突出しないようにされているために、二つの介
在部材４４，４４’を押し出していても、第二カム３２
によってバルブ１を高リフトで開弁させることが可能で
ある。When the first intervening member 44 is pushed out in this way, the valve 1 can be opened at a high lift by the second cam 32 via the first sub-portion 42, and the first intervening member 44 is retracted to allow the first intervening member 44 to retract. If the two intervening members 44 ′ are pushed out, the valve 1 can be opened by the third cam 33 via the second sub-portion 43 with a medium lift. In this embodiment,
Since the cam shape of the third cam 33 does not protrude outside the cam shape of the second cam 32, even if the two intervening members 44, 44 'are pushed out, the second cam 32
Thus, the valve 1 can be opened with a high lift.
【００２６】このような場合において、第二カム３２に
よって第一副部分４２及び主部分４１が作動させられる
時に、主部分４１の第三突出部４１ｅにおける第三前側
端面４１ｆと第二副部分４３の第四突出部４３ｂにおけ
る第四後側端面４３ｄとの間に比較的大きな隙間が存在
するために、第一副部分４２の動作が主部分４１を介し
て第二副部分４３へ伝達されず、第二副部分４３は第三
カム３３によってだけ作動させられる。In such a case, when the first sub-portion 42 and the main portion 41 are operated by the second cam 32, the third front end face 41f of the third protruding portion 41e of the main portion 41 and the second sub-portion 43 The operation of the first sub-portion 42 is not transmitted to the second sub-portion 43 via the main portion 41 because there is a relatively large gap between the fourth protruding portion 43b and the fourth rear end surface 43d. , The second sub-part 43 is operated only by the third cam 33.
【００２７】もし、第一副部分４２の動作が第二副部分
４３へ伝達されるならば、第二カム３２は、第一副部分
４２及び主部分４１に加えて第二副部分４３を回動させ
ることとなり、可動部重量が大きくなるために、カムシ
ャフト２の必要トルクを増大させる。If the operation of the first sub-portion 42 is transmitted to the second sub-portion 43, the second cam 32 rotates the second sub-portion 43 in addition to the first sub-portion 42 and the main portion 41. As a result, the required torque of the camshaft 2 is increased.
【００２８】また、第二副部分４３が高リフトカムであ
る第二カム３２によって回動させられるならば、第二副
部分４３を戻すためのバネ４８を、第一副部分４２を戻
すためのバネ４７と同様に強いものとしなければなら
ず、これは、第三カム３３によってバルブ１を中リフト
で開弁させる際に、第二副部分４３の回動抵抗を増大さ
せ、カムシャフト２の必要トルクを増大させる。If the second sub-portion 43 is rotated by the second cam 32, which is a high lift cam, a spring 48 for returning the second sub-portion 43 and a spring for returning the first sub-portion 42 are provided. 47, which increases the rotational resistance of the second sub-portion 43 when the valve 1 is opened with a medium lift by the third cam 33, and the necessity of the camshaft 2 is increased. Increase torque.
【００２９】もちろん、第二介在部材４４’を引っ込め
た後に第一介在部材４４を押し出すことにより、主部分
４１の第三突出部４１ｅにおける第三前側端面４１ｆと
第二副部分４３の第四突出部４３ｂにおける第二後側端
面４３ｄとを当接させていても、第二副部分４３が第一
副部分４２と共に回動することは防止されるが、このよ
うな制御では、バルブリフトが、中リフトから低リフト
を介して高リフトへ移行することとなり、実際の機関運
転には適さない。従って、バルブリフトを低リフトを介
さずに中リフトから高リフトへ移行させるためには、ど
うしても第一介在部材４４と第二介在部材４４’とが同
時に押し出されている期間が存在して前述の問題を発生
させるために、本実施形態のように、第二カム３２によ
って第一副部分４３及び主部分４１が作動させられる時
に、主部分４１の第三突出部４１ｅにおける第三前側端
面４１ｆと第二副部分４３の第四突出部４３ｂにおける
第四後側端面４３ｄとの間に比較的大きな隙間を設ける
ことは、前述したカムシャフト２の必要トルク増大の問
題解決に有効である。Of course, by pushing out the first intervening member 44 after retracting the second intervening member 44 ', the third front end face 41f of the third protruding portion 41e of the main portion 41 and the fourth protruding portion of the second sub-portion 43 are formed. Although the second sub-portion 43 is prevented from rotating together with the first sub-portion 42 even when the second sub-portion 43d is in contact with the second rear end surface 43d of the portion 43b, the valve lift is reduced by such control. The shift from the middle lift to the high lift via the low lift is not suitable for actual engine operation. Therefore, in order to shift the valve lift from the medium lift to the high lift without going through the low lift, there is always a period in which the first intervening member 44 and the second intervening member 44 ′ are simultaneously extruded, and the above-described period exists. In order to cause a problem, when the first sub-portion 43 and the main portion 41 are operated by the second cam 32 as in the present embodiment, the third front end surface 41f of the third protruding portion 41e of the main portion 41 and Providing a relatively large gap between the fourth protruding portion 43b of the second sub-portion 43 and the fourth rear end surface 43d is effective in solving the above-described problem of the increase in the required torque of the camshaft 2.
【００３０】この一方で、バルブ１の高リフト運転時で
説明したと同様に、第三カム３３による中リフト運転時
には、第三突出部４１ｅの第三後側端面４１ｇが第二介
在部材４４’から離れるように回動することができるよ
うになってしまう。しかしながら、これを引き起こすバ
ルブスプリング１ａのサージングは、主に機関高回転時
において発生し、バルブ１を中リフトで開弁する機関中
回転時には殆ど発生しないために特に問題とはならな
い。On the other hand, as described in the high lift operation of the valve 1, during the middle lift operation by the third cam 33, the third rear end face 41g of the third protrusion 41e is connected to the second intervening member 44 '. Can be turned away from the camera. However, surging of the valve spring 1a that causes this occurs mainly at the time of high engine rotation, and hardly occurs at the time of engine rotation in which the valve 1 is opened with a medium lift, and thus does not cause any problem.
【００３１】このように、主部分４１の両側に第一副部
分４２及び第二副部分４３が設けられ、第二副部分４３
を作動させる第三カム３３の形状が、第一副部分４２を
作動させる第二カム３２の形状の内側に納まっている場
合には、第一介在部材４４及び第二介在部材４４’のい
ずれも押し出す場合を想定して、主部分４１の第三突出
部４１ｅにおける第三前側端面４１ｆと第二副部分４３
の第四突出部４３ｂにおける第四後側端面４３ｄとを当
接させるよりも、両方の間に比較的大きな隙間を設ける
方が有利である。また、この場合において、図４に相当
する図７に示すように、第一副部分４１の第二突出部４
２ｂの第二後側端面４２ｄと、主部分４１の第一突出部
４１ｂの第一前側端面４１ｃとを当接させることなく離
間させていても、前述したカムシャフト２の必要トルク
増大の問題は解決することができる。As described above, the first sub-portion 42 and the second sub-portion 43 are provided on both sides of the main portion 41, and the second sub-portion 43 is provided.
When the shape of the third cam 33 that operates the first sub-portion 42 is within the shape of the second cam 32 that operates the first sub-portion 42, both the first interposed member 44 and the second interposed member 44 ' Assuming the case of extrusion, the third front end face 41f of the third protruding portion 41e of the main portion 41 and the second sub-portion 43
It is more advantageous to provide a relatively large gap between the fourth protruding portion 43b and the fourth rear end face 43d of the fourth protruding portion 43b than to contact the fourth rear end surface 43d. In this case, as shown in FIG. 7 corresponding to FIG.
Even if the second rear end surface 42d of the second portion 2b and the first front end surface 41c of the first protruding portion 41b of the main portion 41 are separated from each other without contacting each other, the problem of the increase in the required torque of the camshaft 2 described above is not solved. Can be solved.
【００３２】動作伝達部材４の回動軸５内に形成された
二つの通路５ａ，５ｂは、第一副部分４２の油圧室４６
及び第二副部分４３の油圧室（図示せず）のそれぞれへ
油圧を供給するための通路である。The two passages 5 a and 5 b formed in the rotation shaft 5 of the operation transmitting member 4 are connected to the hydraulic chamber 46 of the first sub-portion 42.
And a passage for supplying hydraulic pressure to each of the hydraulic chambers (not shown) of the second sub-portion 43.
【００３３】本実施形態において、動作伝達部材４の主
部分４１に当接する第一カム３１を低リフトカムとし
て、第一副部分４２に当接する第二カム３２を高リフト
カムとしたが、これは本発明を限定するものではなく、
例えば、バルブ１が吸気弁の場合において、第二カム３
２は、吸気弁を排気行程で開弁させるためのカムとして
も良い。この場合において、第一介在部材４４を第一副
部分４２から押し出せば、吸気弁は、主部分４１によっ
て吸気行程で開弁させられることに加えて、第一副部分
４２によって排気行程で開弁させられ、排気ガスの一部
を機関吸気系に逆流させて内部的に排気ガス再循環を実
施することが可能となる。本実施形態によれば、主部分
４１の第一突出部４１ｂと第一副部分４２の第二突出部
４２ｂとの前述した当接によって、この排気行程での吸
気弁の開弁時において、主部分４１の異常回動を防止す
ることが可能となる。また、第二カム３２を高リフトカ
ムとして、第三カム３３を、排気行程で吸気弁を開弁さ
せるためのカムとする場合には、第一介在部材４４及び
第二介在部材４４’のいずれも押し出していれば、吸気
弁は、吸気行程において高リフトで開弁させられると共
に排気行程で開弁させられ、第二介在部材４４’を引っ
込めれば、吸気弁は、吸気行程で高リフトで開弁させら
れるだけである。このように、第一介在部材４４及び第
二介在部材４４’のこれら二つの状態によって、吸気弁
に異なる動作をさせる場合、すなわち、第三カム３３が
第二カム３２の形状から突出する形状である場合には、
主部分４１の第三突出部４１ｅと第二副部分４３の第四
突出部４２ｂとを前述のように離間させても意味はな
く、第二介在部材４４’だけを押し出して、吸気弁を吸
気行程において低リフトで開弁（第一カム３１によっ
て）させると共に排気行程において開弁（第三カム３３
によって）させる時の主部分４１の異常回動を防止する
ために、主部分４１の第三突出部４１ｅと第二副部分４
３の第四突出部４２ｂとを当接させることが好ましい。
本実施形態において、動作伝達部材４の主部分４１、第
一副部分４２、及び第二副部分４３は、共通の回動軸線
回りに回動するようにしたが、これは本発明を限定する
ものではなく、各部分を少なくとも互いに平行な異なる
回動軸線回りに回動させるようにしても良い。In the present embodiment, the first cam 31 abutting on the main portion 41 of the motion transmitting member 4 is a low lift cam, and the second cam 32 abutting on the first sub-portion 42 is a high lift cam. Without limiting the invention,
For example, when the valve 1 is an intake valve, the second cam 3
2 may be a cam for opening the intake valve in the exhaust stroke. In this case, when the first intervening member 44 is pushed out of the first sub-portion 42, the intake valve is opened by the first sub-portion 42 in the exhaust stroke in addition to being opened by the main portion 41 in the intake stroke. The exhaust gas is recirculated internally by causing a part of the exhaust gas to flow back to the engine intake system. According to the present embodiment, the contact between the first protruding portion 41b of the main portion 41 and the second protruding portion 42b of the first sub-portion 42 causes the main valve 41 to open when the intake valve is opened in the exhaust stroke. Abnormal rotation of the portion 41 can be prevented. When the second cam 32 is a high lift cam and the third cam 33 is a cam for opening the intake valve in the exhaust stroke, both the first intervening member 44 and the second intervening member 44 'are used. If it is pushed out, the intake valve is opened at a high lift in the intake stroke and is opened in the exhaust stroke. If the second intervening member 44 'is retracted, the intake valve opens at a high lift in the intake stroke. It is only made to valve. As described above, when the intake valve is operated differently depending on these two states of the first intervening member 44 and the second intervening member 44 ′, that is, the third cam 33 is protruded from the shape of the second cam 32. In some cases,
It is meaningless to separate the third protruding portion 41e of the main portion 41 and the fourth protruding portion 42b of the second sub-portion 43 as described above, and only the second intervening member 44 'is pushed out to intake the intake valve. The valve is opened (by the first cam 31) at a low lift in the stroke and the valve is opened (the third cam 33) in the exhaust stroke.
In order to prevent the abnormal rotation of the main part 41 when the main part 41 is rotated, the third protruding part 41e of the main part 41 and the second sub part 4
It is preferable that the third fourth protrusion 42b is brought into contact with the third protrusion 42b.
In the present embodiment, the main portion 41, the first sub-portion 42, and the second sub-portion 43 of the operation transmitting member 4 are configured to rotate around a common rotation axis, but this limits the present invention. Instead, each part may be rotated at least around different rotation axes parallel to each other.
【００３４】[0034]
【発明の効果】このように、本発明による内燃機関の可
変動弁機構は、第一カム及び第二カムと、動作伝達部材
とを具備し、動作伝達部材は、第一カムにより回動させ
られて吸気弁又は排気弁に当接する主部分と、第二カム
により回動させられる副部分とを有し、主部分と副部分
とは少なくとも互いに平行なそれぞれの回動軸線方向に
互いに隣接し、主部分は、副部分へ向けて回動軸線方向
に突出する第一突出部を有し、副部分は、主部分へ向け
て回動軸線方向に突出する第二突出部を有し、第一突出
部は、主部分の吸気弁又は排気弁の開弁への回動方向に
おける第一前側端面と第一後側端面とを有し、第二突出
部は、副部分の吸気弁又は排気弁の開弁への回動方向に
おける第二前側端面と第二後側端面とを有し、第一前側
端面と第二後側端面とは互いに対向し、第一後側端面と
第二前側端面とは互いに対向し、第一後側端面と第二前
側端面との間へ押し出し可能な介在部材が設けられ、介
在部材が押し出されていない時には、副部分は主部分に
対して自由に回動し、介在部材が押し出された時には、
第二カムによる副部分の回動動作は、吸気弁又は排気弁
を開弁するために、介在部材を介して主部分へ伝達され
ると共に、第一前側端面は第二後側端面にほぼ当接して
いる。それにより、副部分の回動動作が介在部材を介し
て主部分へ伝達される時に、バルブスプリングのサージ
ング等によって、第一突出部の第一後側端面が介在部材
から離れるように、主部分が異常に回動しようとして
も、この回動は、第一突出部の第一前側端面が第二突出
部の第二後側端面にほぼ当接しているために防止され
る。こうして、吸気弁が異常に押し下げられて閉弁時に
破損したり、反動によって主部分の第一突出部が介在部
材に激しく衝突し、主部分及び介在部材が破損すること
が防止可能となる。As described above, the variable valve mechanism for an internal combustion engine according to the present invention includes the first cam and the second cam, and the operation transmitting member, and the operation transmitting member is rotated by the first cam. And a sub-portion rotated by the second cam, and the main portion and the sub-portion are adjacent to each other at least in respective rotation axis directions parallel to each other. The main portion has a first protrusion protruding in the rotation axis direction toward the sub-portion, and the sub-portion has a second protrusion protruding in the rotation axis direction toward the main portion; The one protrusion has a first front end surface and a first rear end surface in a rotation direction of the main part of the intake valve or the exhaust valve to open, and the second protrusion has a sub part of the intake valve or the exhaust part. A second front end face and a second rear end face in the direction of rotation of the valve to open, a first front end face and a second rear end; Are opposed to each other, the first rear end face and the second front end face are opposed to each other, and an interposed member capable of being pushed out between the first rear end face and the second front end face is provided, and the interposed member is extruded. When not, the sub-part rotates freely with respect to the main part, and when the interposed member is pushed out,
The pivoting operation of the sub-portion by the second cam is transmitted to the main portion through an intervening member to open the intake valve or the exhaust valve, and the first front end face substantially abuts the second rear end face. In contact. Thereby, when the rotation operation of the sub-portion is transmitted to the main portion via the intervening member, the main rear portion of the first protruding portion is separated from the intervening member by surging of the valve spring or the like. Is abnormally rotated, this rotation is prevented because the first front end face of the first projection substantially abuts the second rear end face of the second projection. In this way, it is possible to prevent the intake valve from being abnormally pushed down and being damaged when the valve is closed, or the first projection of the main portion violently colliding against the intervening member due to the recoil, thereby preventing the main portion and the intervening member from being damaged.
【００３５】また、本発明によるもう一つの内燃機関の
可変動弁機構は、第一カム、第二カム及び第三カムと、
動作伝達部材とを具備し、動作伝達部材は、第一カムに
より回動させられて吸気弁又は排気弁に当接する主部分
と、第二カムにより回動させられる第一副部分とを有
し、主部分と第一副部分とは少なくとも互いに平行なそ
れぞれの回動軸線方向に互いに隣接し、主部分は、第一
副部分へ向けて回動軸線方向に突出する第一突出部を有
し、第一副部分は、主部分へ向けて回動軸線方向に突出
する第二突出部を有し、第一突出部は、主部分の吸気弁
又は排気弁の開弁への回動方向における第一前側端面と
第一後側端面とを有し、第二突出部は、第一副部分の吸
気弁又は排気弁の開弁への回動方向における第二前側端
面と第二後側端面とを有し、第一後側端面と第二前側端
面とは互いに対向し、第一後側端面と第二前側端面との
間へ押し出し可能な第一介在部材が設けられ、第一介在
部材が押し出されていない時には、第一副部分は主部分
に対して自由に回動し、第一介在部材が押し出された時
には、第二カムによる第一副部分の回動動作は、吸気弁
又は排気弁を開弁するために、第一介在部材を介して主
部分へ伝達され、第三カムは第二カムの形状より外側に
突出しない形状を有し、動作伝達部材は、第三カムによ
り回動させられる第二副部分を有し、主部分と第二副部
分とは少なくとも互いに平行なそれぞれの回動軸線方向
に互いに隣接し、主部分は、第二副部分へ向けて回動軸
線方向に突出する第三突出部を有し、副部分は、主部分
へ向けて回動軸線方向に突出する第四突出部を有し、第
三突出部は、主部分の吸気弁又は排気弁の開弁への回動
方向における第三前側端面と第三後側端面とを有し、第
四突出部は、第二副部分の吸気弁又は排気弁の開弁への
回動方向における第四前側端面と第四後側端面とを有
し、第三後側端面と第四前側端面とは互いに対向し、第
三後側端面と第四前側端面との間へ押し出し可能な第二
介在部材が設けられ、第二介在部材が押し出されていな
い時には、第二副部分は主部分に対して自由に回動し、
第二介在部材が押し出された時には、第三カムによる第
二副部分の回動動作は、吸気弁又は排気弁を開弁するた
めに、第二介在部材を介して主部分へ伝達されると共
に、第三前側端面は第四後側端面から離間し、第一介在
部材及び第二介在部材がいずれも押し出されている時
に、第二カムによる第一副部材の回動動作が第二副部材
へ伝達されないようになっている。それにより、第一介
在部材及び第二介在部材のいずれも押し出されている時
に、第二カムが第一副部材と主部材とに加えて第二副部
材を回動させることはなく、可動部重量の増大によって
カムシャフトの必要トルクが増大することを防止するこ
とができる。Further, another variable valve mechanism for an internal combustion engine according to the present invention comprises a first cam, a second cam and a third cam,
An operation transmission member, the operation transmission member having a main portion rotated by the first cam and abutting on the intake valve or the exhaust valve, and a first sub-portion rotated by the second cam. The main portion and the first sub-portion are at least adjacent to each other in the respective rotation axis directions parallel to each other, and the main portion has a first protrusion protruding in the rotation axis direction toward the first sub-portion. , The first sub-portion has a second protrusion protruding in the direction of the rotation axis toward the main portion, and the first protrusion is in the rotation direction to open the intake valve or the exhaust valve of the main portion. A first front end surface and a first rear end surface, and the second protrusion is a second front end surface and a second rear end surface in a rotation direction of the first sub-portion to the opening of the intake valve or the exhaust valve. And the first rear end face and the second front end face face each other and can be extruded between the first rear end face and the second front end face. When one intervening member is provided and the first intervening member is not pushed out, the first sub-portion freely rotates with respect to the main portion, and when the first intervening member is pushed out, the first cam is pushed by the second cam. The rotation of the sub-portion is transmitted to the main portion via the first interposition member to open the intake valve or the exhaust valve, and the third cam has a shape that does not protrude outside the shape of the second cam. The motion transmitting member has a second sub-portion rotated by the third cam, and the main portion and the second sub-portion are adjacent to each other at least in respective rotation axis directions parallel to each other, and the main portion is A third projection projecting in the direction of the rotation axis toward the second sub-portion, the sub-portion having a fourth projection projecting in the direction of the rotation axis toward the main portion, the third projection The part is the third front end face and the third rear side in the direction of rotation of the main part intake valve or exhaust valve to open. And the fourth protrusion has a fourth front end surface and a fourth rear end surface in the rotation direction of the intake valve or the exhaust valve of the second sub-portion to open, and the third rear side. The end face and the fourth front end face face each other, and a second interposed member that can be pushed out between the third rear end face and the fourth front end face is provided, and when the second interposed member is not extruded, the second interposed member is provided. The sub-part rotates freely with respect to the main part,
When the second interposed member is pushed out, the rotation of the second sub-portion by the third cam is transmitted to the main portion via the second interposed member to open the intake valve or the exhaust valve. The third front end face is separated from the fourth rear end face, and when both the first interposed member and the second interposed member are pushed out, the rotation of the first sub member by the second cam is performed by the second sub member. It is not transmitted to. Accordingly, when both the first interposed member and the second interposed member are being pushed out, the second cam does not rotate the second sub-member in addition to the first sub-member and the main member, and the movable portion An increase in the required torque of the camshaft due to an increase in weight can be prevented.
【図１】本発明による内燃機関の可変動弁機構における
実施形態を示す側面図である。FIG. 1 is a side view showing an embodiment of a variable valve mechanism of an internal combustion engine according to the present invention.
【図２】図１の可変動弁機構の平面図である。FIG. 2 is a plan view of the variable valve mechanism of FIG. 1;
【図３】図１の可変動弁機構の分解斜視図である。FIG. 3 is an exploded perspective view of the variable valve mechanism of FIG.
【図４】動作伝達部材の主部分の第一突出部と第一副部
分の第二突出部とを回動軸線に垂直に通る断面図であ
る。FIG. 4 is a cross-sectional view passing through a first protrusion of a main portion of the operation transmitting member and a second protrusion of a first sub-portion perpendicular to a rotation axis.
【図５】図４のＡ−Ａ断面図である。FIG. 5 is a sectional view taken along line AA of FIG. 4;
【図６】動作伝達部材の主部分の第三突出部と第二副部
分の第四突出部とを回動軸線に垂直に通る断面図であ
る。FIG. 6 is a cross-sectional view passing through a third protruding portion of a main portion of the operation transmitting member and a fourth protruding portion of a second sub-portion perpendicularly to a rotation axis.
【図７】図４とは異なる形状の第一突出部と第二突出部
とを回動軸線に垂直に通る断面図である。FIG. 7 is a cross-sectional view passing through first and second protrusions having shapes different from those of FIG. 4 perpendicularly to the rotation axis.
１…バルブ ４…動作伝達部材 ３１…第一カム ３２…第二カム ３３…第三カム ４１…主部分 ４１ｂ…第一突出部 ４１ｃ…第一前側端面 ４１ｄ…第一後側端面 ４１ｅ…第三突出部 ４１ｆ…第三前側端面 ４１ｇ…第三後側端面 ４２…第一副部分 ４２ｂ…第二突出部 ４２ｃ…第二前側端面 ４２ｄ…第二後側端面 ４３…第二副部分 ４３ｂ…第四突出部 ４３ｃ…第四前側端面 ４３ｄ…第四後側端面 ４４…第一介在部材 ４４’…第二介在部材 DESCRIPTION OF SYMBOLS 1 ... Valve 4 ... Operation transmission member 31 ... First cam 32 ... Second cam 33 ... Third cam 41 ... Main part 41b ... First protruding part 41c ... First front end face 41d ... First rear end face 41e ... Third Projecting portion 41f Third front end surface 41g Third rear end surface 42 First subportion 42b Second protruding portion 42c Second front end surface 42d Second rear end surface 43 Second subportion 43b Fourth Projection 43c Fourth front end face 43d Fourth rear end face 44 First interposed member 44 'Second interposed member
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 3G018 AB04 AB16 BA03 BA14 BA15 BA17 BA35 BA36 CA18 CB02 DA03 DA12 DA18 DA19 DA69 DA70 DA75 DA85 DA86 EA22 EA23 EA24 EA31 FA04 FA06 GA02 GA03 GA12 GA14 GA22 GA27 GA31 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3G018 AB04 AB16 BA03 BA14 BA15 BA17 BA35 BA36 CA18 CB02 DA03 DA12 DA18 DA19 DA69 DA70 DA75 DA85 DA86 EA22 EA23 EA24 EA31 FA04 FA06 GA02 GA03 GA12 GA14 GA22 GA27 GA31
Claims (2)
とを具備し、前記動作伝達部材は、前記第一カムにより
回動させられて吸気弁又は排気弁に当接する主部分と、
前記第二カムにより回動させられる副部分とを有し、前
記主部分と前記副部分とは少なくとも互いに平行なそれ
ぞれの回動軸線方向に互いに隣接し、前記主部分は、前
記副部分へ向けて前記回動軸線方向に突出する第一突出
部を有し、前記副部分は、前記主部分へ向けて前記回動
軸線方向に突出する第二突出部を有し、前記第一突出部
は、前記主部分の前記吸気弁又は排気弁の開弁への回動
方向における第一前側端面と第一後側端面とを有し、前
記第二突出部は、前記副部分の前記吸気弁又は排気弁の
開弁への回動方向における第二前側端面と第二後側端面
とを有し、前記第一前側端面と前記第二後側端面とは互
いに対向し、前記第一後側端面と前記第二前側端面とは
互いに対向し、前記第一後側端面と前記第二前側端面と
の間へ押し出し可能な介在部材が設けられ、前記介在部
材が押し出されていない時には、前記第一副部分は前記
主部分に対して自由に回動し、前記介在部材が押し出さ
れた時には、前記第二カムによる前記副部分の回動動作
は、前記吸気弁又は排気弁を開弁するために、前記介在
部材を介して前記主部分へ伝達されると共に、前記第一
前側端面は前記第二後側端面にほぼ当接していることを
特徴とする内燃機関の可変動弁機構。1. A first part comprising: a first cam and a second cam; and an operation transmitting member, wherein the operation transmitting member is rotated by the first cam and a main part which comes into contact with an intake valve or an exhaust valve;
A sub-portion rotated by the second cam, wherein the main portion and the sub-portion are adjacent to each other at least in respective rotation axis directions parallel to each other, and the main portion is directed toward the sub-portion. The first portion has a first protrusion protruding in the direction of the rotation axis, the sub-portion has a second protrusion protruding in the direction of the rotation axis toward the main portion, and the first protrusion is Having a first front end face and a first rear end face in a direction of rotation of the main part of the intake valve or the exhaust valve to open, and wherein the second protrusion is the intake valve of the sub part or A second front end face and a second rear end face in the direction of rotation of the exhaust valve to open, the first front end face and the second rear end face facing each other, and the first rear end face; And the second front end face are opposed to each other, and can be pushed out between the first rear end face and the second front end face. When the intervening member is not pushed out, the first sub-portion freely rotates with respect to the main portion, and when the intervening member is pushed out, The pivoting operation of the sub-portion is transmitted to the main portion through the intervening member to open the intake valve or the exhaust valve, and the first front end surface is substantially attached to the second rear end surface. A variable valve mechanism for an internal combustion engine, wherein the variable valve mechanism is in contact with the internal combustion engine.
作伝達部材とを具備し、前記動作伝達部材は、前記第一
カムにより回動させられて吸気弁又は排気弁に当接する
主部分と、前記第二カムにより回動させられる第一副部
分とを有し、前記主部分と前記第一副部分とは少なくと
も互いに平行なそれぞれの回動軸線方向に互いに隣接
し、前記主部分は、前記第一副部分へ向けて前記回動軸
線方向に突出する第一突出部を有し、前記第一副部分
は、前記主部分へ向けて前記回動軸線方向に突出する第
二突出部を有し、前記第一突出部は、前記主部分の前記
吸気弁又は排気弁の開弁への回動方向における第一前側
端面と第一後側端面とを有し、前記第二突出部は、前記
第一副部分の前記吸気弁又は排気弁の開弁への回動方向
における第二前側端面と第二後側端面とを有し、前記第
一後側端面と前記第二前側端面とは互いに対向し、前記
第一後側端面と前記第二前側端面との間へ押し出し可能
な第一介在部材が設けられ、前記第一介在部材が押し出
されていない時には、前記第一副部分は前記主部分に対
して自由に回動し、前記第一介在部材が押し出された時
には、前記第二カムによる前記第一副部分の回動動作
は、前記吸気弁又は排気弁を開弁するために、前記第一
介在部材を介して前記主部分へ伝達され、前記第三カム
は前記第二カムの形状より外側に突出しない形状を有
し、前記動作伝達部材は、前記第三カムにより回動させ
られる第二副部分を有し、前記主部分と前記第二副部分
とは少なくとも互いに平行なそれぞれの回動軸線方向に
互いに隣接し、前記主部分は、前記第二副部分へ向けて
前記回動軸線方向に突出する第三突出部を有し、前記副
部分は、前記主部分へ向けて前記回動軸線方向に突出す
る第四突出部を有し、前記第三突出部は、前記主部分の
前記吸気弁又は排気弁の開弁への回動方向における第三
前側端面と第三後側端面とを有し、前記第四突出部は、
前記第二副部分の前記吸気弁又は排気弁の開弁への回動
方向における第四前側端面と第四後側端面とを有し、前
記第三後側端面と前記第四前側端面とは互いに対向し、
前記第三後側端面と前記第四前側端面との間へ押し出し
可能な第二介在部材が設けられ、前記第二介在部材が押
し出されていない時には、前記第二副部分は前記主部分
に対して自由に回動し、前記第二介在部材が押し出され
た時には、前記第三カムによる前記第二副部分の回動動
作は、前記吸気弁又は排気弁を開弁するために、前記第
二介在部材を介して前記主部分へ伝達されると共に、前
記第三前側端面は前記第四後側端面から離間し、前記第
一介在部材及び前記第二介在部材がいずれも押し出され
ている時に、前記第二カムによる前記第一副部材の回動
動作が前記第二副部材へ伝達されないようになっている
ことを特徴とする内燃機関の可変動弁機構。2. A first cam, a second cam, and a third cam, and an operation transmitting member, wherein the operation transmitting member is rotated by the first cam and abuts on an intake valve or an exhaust valve. A main portion and a first sub-portion rotated by the second cam, wherein the main portion and the first sub-portion are adjacent to each other at least in respective rotation axis directions parallel to each other; The portion has a first protrusion protruding in the rotation axis direction toward the first sub-portion, and the first sub-portion protrudes in the rotation axis direction toward the main portion. A first protruding portion, the first protruding portion has a first front end surface and a first rear end surface in a rotation direction of the main portion to open the intake valve or the exhaust valve, and the second protruding portion; The protruding portion has a second front end surface in a rotation direction of the first sub-portion to open the intake valve or the exhaust valve. A first interposition having a second rear end face, wherein the first rear end face and the second front end face face each other and can be extruded between the first rear end face and the second front end face. When the first intervening member is not pushed out, the first sub-portion freely rotates with respect to the main portion, and when the first intervening member is pushed out, the second cam is provided. The rotation operation of the first sub-portion is transmitted to the main portion through the first interposition member to open the intake valve or the exhaust valve, and the third cam is the same as the second cam. The operation transmitting member has a second sub-portion that is rotated by the third cam, and the main portion and the second sub-portion are at least parallel to each other. The main part is adjacent to each other in the rotation axis direction of the second sub-part. A third protruding portion protruding in the direction of the rotation axis toward the main portion; the sub-portion having a fourth protruding portion protruding in the direction of the rotation axis toward the main portion; Has a third front end surface and a third rear end surface in the rotation direction of the main portion to the opening of the intake valve or the exhaust valve, and the fourth protrusion is
A fourth front end face and a fourth rear end face in the direction of rotation of the intake valve or the exhaust valve of the second sub-portion toward opening are provided, and the third rear end face and the fourth front end face are Facing each other,
A second interposed member that can be extruded between the third rear end surface and the fourth front end surface is provided, and when the second interposed member is not extruded, the second sub-portion is relative to the main portion. When the second intervening member is pushed out and the second intervening member is pushed out, the turning operation of the second sub-portion by the third cam causes the second valve to open the intake valve or the exhaust valve. While being transmitted to the main portion via the interposed member, the third front end surface is separated from the fourth rear end surface, and when the first interposed member and the second interposed member are both extruded, A variable valve mechanism for an internal combustion engine, wherein the rotation of the first sub-member by the second cam is not transmitted to the second sub-member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000271957A JP3767351B2 (en) | 1999-12-17 | 2000-09-07 | Variable valve mechanism for internal combustion engine |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35935299 | 1999-12-17 | ||
| JP11-359352 | 1999-12-17 | ||
| JP2000271957A JP3767351B2 (en) | 1999-12-17 | 2000-09-07 | Variable valve mechanism for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001234722A true JP2001234722A (en) | 2001-08-31 |
| JP3767351B2 JP3767351B2 (en) | 2006-04-19 |
Family
ID=26580957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000271957A Expired - Fee Related JP3767351B2 (en) | 1999-12-17 | 2000-09-07 | Variable valve mechanism for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3767351B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101234654B1 (en) * | 2010-12-06 | 2013-02-19 | 현대자동차주식회사 | Variable valve driving apparatus |
| US10879672B2 (en) | 2015-09-16 | 2020-12-29 | Huawei Technologies Co., Ltd. | Increased modulation bandwidth and phase control in VCSELS with recessed structures in a reflector layer |
-
2000
- 2000-09-07 JP JP2000271957A patent/JP3767351B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101234654B1 (en) * | 2010-12-06 | 2013-02-19 | 현대자동차주식회사 | Variable valve driving apparatus |
| US8596236B2 (en) | 2010-12-06 | 2013-12-03 | Hyundai Motor Company | Variable valve driving apparatus |
| US10879672B2 (en) | 2015-09-16 | 2020-12-29 | Huawei Technologies Co., Ltd. | Increased modulation bandwidth and phase control in VCSELS with recessed structures in a reflector layer |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3767351B2 (en) | 2006-04-19 |
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