JP2003184514A - Variable valve mechanism - Google Patents
Variable valve mechanismInfo
- Publication number
- JP2003184514A JP2003184514A JP2001379791A JP2001379791A JP2003184514A JP 2003184514 A JP2003184514 A JP 2003184514A JP 2001379791 A JP2001379791 A JP 2001379791A JP 2001379791 A JP2001379791 A JP 2001379791A JP 2003184514 A JP2003184514 A JP 2003184514A
- Authority
- JP
- Japan
- Prior art keywords
- cam
- wall portion
- side wall
- cup member
- lifter
- 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.)
- Granted
Links
Classifications
-
- 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
- F01L2307/00—Preventing the rotation of tappets
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、内燃機関の運転状況に
応じてバルブタイミング及びリフト量を変化させる可変
動弁機構に関し、特に直打式バルブリフタの回転阻止構
造に係るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable valve mechanism that changes valve timing and lift according to operating conditions of an internal combustion engine, and more particularly to a rotation preventing structure for a direct drive valve lifter.
【０００２】[0002]
【従来の技術】カムプロフィールが軸方向に連続的に変
化する立体カムと、該立体カムに接触するカム接触子を
備えた直打式バルブリフタとを用いた可変動弁機構によ
れば、内燃機関の低回転時から高回転時まで、バルブタ
イミング及びリフト量を連続的に変化させて、内燃機関
の運転状況に応じた精密な制御を行なうことができる。
この可変動弁機構においては、立体カムに対してカム接
触子が回転しないようにする回転阻止構造が設けられる
が、前記公報に記載された回転阻止構造では、部品点数
の増加や剛性の低下等の問題があった（後記の特開２０
００−１３６７０４号公報で指摘）。2. Description of the Related Art A variable valve mechanism using a three-dimensional cam whose cam profile changes continuously in the axial direction and a direct-acting valve lifter provided with a cam contactor contacting the three-dimensional cam is an internal combustion engine. It is possible to continuously change the valve timing and the lift amount from the low rotation speed to the high rotation speed, and perform precise control according to the operating condition of the internal combustion engine.
This variable valve mechanism is provided with a rotation blocking structure that prevents the cam contactor from rotating with respect to the three-dimensional cam. However, in the rotation blocking structure described in the above publication, the number of parts is increased and the rigidity is lowered. There was a problem of
No. 00-136704, pointed out).
【０００３】そこで、本出願人は先に、前記問題を解消
できる回転阻止構造として、図１８に示すとおり、直打
式バルブリフタの倒立カップ状のカップ部材１０７の端
壁部１１８の外周面に、シリンダヘッド１０９に対する
カップ部材１０７の回転を阻止する凸部１２５を一体的
に設け、シリンダヘッド１０９のガイド穴１１０の一部
に、前記凸部１２５が摺動可能に嵌合する凹溝１２６を
設けたものを提案した（特開２０００−１３６７０４号
公報）。この可変動弁機構によれば、部品点数を削減
し、剛性を高めることができた。Therefore, the present applicant has previously proposed, as a rotation preventing structure capable of solving the above problems, as shown in FIG. 18, on the outer peripheral surface of the end wall portion 118 of the inverted cup-shaped cup member 107 of the direct hitting valve lifter. A convex portion 125 that prevents rotation of the cup member 107 with respect to the cylinder head 109 is integrally provided, and a concave groove 126 into which the convex portion 125 is slidably fitted is provided in a part of the guide hole 110 of the cylinder head 109. It has been proposed (Japanese Patent Laid-Open No. 2000-136704). According to this variable valve mechanism, the number of parts can be reduced and the rigidity can be increased.
【０００４】[0004]
【発明が解決しようとする課題】ところが、図７の回転
阻止構造によると、端壁部１１８の外側に凸部１２５を
設けるので、該凸部１２５が邪魔になって側壁部１１９
の外周面の研削加工が困難になり、該面の精度を確保す
ることも困難になっていた。However, according to the rotation preventing structure of FIG. 7, since the convex portion 125 is provided outside the end wall portion 118, the convex portion 125 interferes with the side wall portion 119.
It became difficult to grind the outer peripheral surface of the, and it was also difficult to secure the accuracy of the surface.
【０００５】そこで、本発明の目的は、カップ部材及び
カム接触子の回転阻止構造を簡単な構成で実現すること
ができ、側壁部の外周面の研削加工及び精度確保を容易
化できる可変動弁機構を提供することにある。Therefore, an object of the present invention is to provide a variable valve which can realize a rotation preventing structure for a cup member and a cam contactor with a simple structure, and can easily grind an outer peripheral surface of a side wall portion and secure accuracy. To provide a mechanism.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明の可変動弁機構は、カムプロフィールを軸方
向に連続的に変化させた立体カムと、内燃機関の回転数
等の運転状況に応じて前記立体カムを軸方向へ変位させ
る変位装置と、立体カムのカムプロフィールに基づいて
往復動することによりバルブを開閉する直打式バルブリ
フタとを備えた可変動弁機構において、前記直打式バル
ブリフタは、立体カムと接触するカム接触子と、シリン
ダヘッドのリフタガイド穴に摺動可能に挿入された円筒
状のカップ部材とを備え、前記カップ部材を、立体カム
と対向する端壁部とリフタガイド穴に摺接する側壁部と
から一体成形するとともに該側壁部に穴を貫設し、前記
カップ部材に、該穴を介して前記側壁部の外側に突出す
る凸部と、該穴を通過不可能に形成され、前記カップ部
材の内面に取り付けられる取付部とが一体形成されてな
る回転阻止部材を取り付け、シリンダヘッドのリフタガ
イド穴に前記凸部が摺動可能に嵌合する凹溝を形成した
ことを特徴としている。In order to achieve the above object, a variable valve mechanism according to the present invention comprises a three-dimensional cam whose cam profile is continuously changed in the axial direction and an operation such as the rotational speed of an internal combustion engine. A variable valve mechanism including a displacement device for axially displacing the solid cam depending on the situation, and a direct-acting valve lifter for opening and closing the valve by reciprocating based on the cam profile of the solid cam, wherein The striking valve lifter includes a cam contactor that comes into contact with the solid cam and a cylindrical cup member that is slidably inserted into a lifter guide hole of a cylinder head. The cup member has an end wall facing the solid cam. Part and a side wall part that is in sliding contact with the lifter guide hole, and a hole is formed through the side wall part, and the cup member has a convex part protruding to the outside of the side wall part through the hole, and the hole. To A recessed groove that is formed so as not to be improper and has a rotation preventing member integrally formed with a mounting portion that is mounted on the inner surface of the cup member, and in which the convex portion is slidably fitted in a lifter guide hole of a cylinder head. Is formed.
【０００７】前記取付部としては、特に限定されない
が、次の態様を例示する。
（１）前記側壁部内面を押圧することにより前記カップ
部材に位置保持されるように構成された態様。
（２）前記端壁部内面に溶接固定されることにより取り
付けられるように構成された態様。The mounting portion is not particularly limited, but the following modes are exemplified. (1) A mode in which the inner surface of the side wall portion is pressed to be held in position by the cup member. (2) A mode configured to be attached by being welded and fixed to the inner surface of the end wall portion.
【０００８】立体カムは、低回転用カムプロフィールか
ら高回転用カムプロフィールまでカムプロフィールを軸
方向に連続的に変化させたものが好ましい。The three-dimensional cam is preferably one in which the cam profile is continuously changed in the axial direction from the low rotation cam profile to the high rotation cam profile.
【０００９】低回転用カムプロフィールにおけるバルブ
タイミングの位相、開弁作用角及びリフト量と、高回転
用カムプロフィールにおけるバルブタイミングの位相、
開弁作用角及びリフト量は、個々の内燃機関における要
求事項に応じて適宜設定することができる。もっとも、
多くの場合、低回転用カムプロフィールは開弁作用角及
びリフト量が小さく、高回転用カムプロフィールは開弁
作用角及びリフト量が大きい。The phase of the valve timing, the valve operating angle and the lift amount in the cam profile for low rotation, and the phase of the valve timing in the cam profile for high rotation,
The valve opening operating angle and the lift amount can be appropriately set according to the requirements of each internal combustion engine. However,
In many cases, the low rotation cam profile has a small valve opening angle and lift amount, and the high rotation cam profile has a large valve opening angle and lift amount.
【００１０】変位装置により立体カムを段階的に変位さ
せる場合、二段階に変化させてもよいが、その場合は二
段階の変位を調節できるようにすることが好ましい。さ
らに好ましくは、立体カムを少なくとも三段階に変位さ
せることである。最も好ましくは、立体カムを連続的に
変位させることである。変位装置は特定の構造に限定さ
れず、油圧、電磁力等を利用したものを例示できる。When the three-dimensional cam is displaced stepwise by the displacement device, it may be changed in two steps, but in that case, it is preferable to be able to adjust the displacement in two steps. More preferably, the solid cam is displaced in at least three steps. Most preferably, the solid cam is continuously displaced. The displacement device is not limited to a specific structure, and may be one using hydraulic pressure, electromagnetic force, or the like.
【００１１】追従接触機構は、特に限定されないが、リ
フタブリッジの中央部に設けられた半円筒内面座と、該
半円筒内面座にロール運動可能に嵌合されたカム接触子
とからなるものが好ましい。このカム接触子は、バルブ
クリアランス調整用の取替部品とされてもよい。その
他、特開平９−２９６７１４号公報に示したカム接触子
付ローラ機構を適用することもできる。The follow-up contact mechanism is not particularly limited, but is composed of a semi-cylindrical inner surface seat provided in the central portion of the lifter bridge and a cam contactor fitted to the semi-cylindrical inner surface seat so as to be able to roll. preferable. The cam contact may be a replacement part for adjusting the valve clearance. In addition, the roller mechanism with cam contactor shown in Japanese Patent Laid-Open No. 9-296714 can be applied.
【００１２】なお、本発明の可変動弁機構は、吸気バル
ブ又は排気バルブの何れか一方に適用することもできる
が、両方に適用することが好ましい。The variable valve mechanism of the present invention can be applied to either the intake valve or the exhaust valve, but is preferably applied to both.
【００１３】[0013]
【発明の実施の形態】以下、本発明を吸気バルブ及び排
気バルブの両方に適用した可変動弁機構の実施形態につ
いて、図面を参照して説明する。よって、実施形態にお
いて単にバルブというときは、吸気バルブと排気バルブ
の両方を指す。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a variable valve mechanism in which the present invention is applied to both an intake valve and an exhaust valve will be described below with reference to the drawings. Therefore, in the embodiment, the term “valve” simply means both the intake valve and the exhaust valve.
【００１４】まず、図１〜図４に示すように、可変動弁
機構のカムシャフト１には、図４において右側の低回転
用カムプロフィールから左側の高回転用カムプロフィー
ルまで、カムプロフィールを軸方向に連続的に変化させ
た立体カム２が形成されている。立体カム２はベース円
部２ａとノーズ部２ｂとからなり、ベース円部２ａは、
低回転用カムプロフィールにおいても高回転用カムプロ
フィールにおいても同一半径であるため、傾斜の無い円
柱面である。しかし、ノーズ部２ｂは、低回転用カムプ
ロフィールにおいては開弁作用角及びリフト量が小さ
く、高回転用カムプロフィールにおいては開弁作用角及
びリフト量が大きいため、円錐面のように傾斜してい
る。First, as shown in FIGS. 1 to 4, the camshaft 1 of the variable valve mechanism has a cam profile from a low rotation cam profile on the right side to a high rotation cam profile on the left side in FIG. A three-dimensional cam 2 that is continuously changed in the direction is formed. The three-dimensional cam 2 includes a base circle portion 2a and a nose portion 2b, and the base circle portion 2a is
Since the low-rotation cam profile and the high-rotation cam profile have the same radius, they are cylindrical surfaces without inclination. However, the nose portion 2b is inclined like a conical surface because the valve opening working angle and the lift amount are small in the low rotation cam profile and the valve opening working angle and the lift amount are large in the high rotation cam profile. There is.
【００１５】カムシャフト１の端部には、内燃機関の回
転数等の運転状況に応じてカムシャフト１及び立体カム
２を軸方向へ連続的に変位させる変位装置３が設けられ
ている。変位装置３は、例えば、スプラインを用いたカ
ムシャフト１のガイド部と、油圧を用いたカムシャフト
１の駆動部とからなり（いずれも図示略）、内燃機関の
回転センサやアクセル開度センサ等に基づいて作動する
マイクロコンピュータ等の制御装置（図示略）により制
御されるようになっている。At the end of the camshaft 1, there is provided a displacement device 3 for continuously displacing the camshaft 1 and the solid cam 2 in the axial direction according to the operating conditions such as the number of revolutions of the internal combustion engine. The displacement device 3 includes, for example, a guide portion of the camshaft 1 using a spline and a drive portion of the camshaft 1 using hydraulic pressure (all are not shown), and a rotation sensor of an internal combustion engine, an accelerator opening sensor, etc. Is controlled by a control device (not shown) such as a microcomputer that operates based on the above.
【００１６】カムシャフト１の下方には、立体カム２の
カムプロフィールに基づいてバルブ４を開閉する直打式
バルブリフタ５が配置されている。このバルブリフタ５
は、立体カム２に接触するカム接触子６と、カム接触子
６を支持する円筒状のカップ部材７とを備え、カップ部
材７はスプリング８により立体カム２側へ付勢される。
カム接触子６は半割り円柱状に形成され、立体カム２の
回転に伴う接触線角度の変化に追従してカムシャフト１
と直角の軸線周りで揺動される（図４参照）。カップ部
材７はシリンダヘッド９のリフタガイド穴１０に摺動可
能に挿入され、立体カム２の回転に伴いカム接触子６を
介しバルブ４のステム部４ａと平行な軸線に沿って往復
動される。Below the camshaft 1, a direct-acting valve lifter 5 for opening and closing the valve 4 based on the cam profile of the three-dimensional cam 2 is arranged. This valve lifter 5
Includes a cam contactor 6 that contacts the three-dimensional cam 2 and a cylindrical cup member 7 that supports the cam contactor 6, and the cup member 7 is biased toward the three-dimensional cam 2 side by a spring 8.
The cam contactor 6 is formed in a half-cylindrical shape, and follows the change of the contact line angle due to the rotation of the three-dimensional cam 2 and the camshaft 1
Is swung about an axis perpendicular to (see Fig. 4). The cup member 7 is slidably inserted into the lifter guide hole 10 of the cylinder head 9, and is reciprocated along the axis parallel to the stem portion 4a of the valve 4 via the cam contactor 6 as the solid cam 2 rotates. .
【００１７】ステム部４ａはシリンダヘッド９に固定さ
れたバルブガイド１１に摺動可能に挿通されている。ス
テム部４ａの上端部にはノッチ１２が形成され、ノッチ
１２にはスプリングリテーナ１３がコッタ１４を介しバ
ルブ軸線方向へ移動不能に係止されている。スプリング
８はステム部４ａに嵌挿され、その上端はスプリングリ
テーナ１３に保持され、下端はシリンダヘッド９に固定
されたスプリングシート１５に保持されている。そし
て、スプリング８はカップ部材７を立体カム２側へ付勢
することにより、カム接触子６を立体カム２に圧接させ
るとともに、バルブ４を閉鎖方向へ付勢するようになっ
ている。なお、シリンダヘッド９の上面には立体カム２
の回転軌跡を逃がすための逃がし凹部１６（図３参照）
が形成されている。The stem portion 4a is slidably inserted into a valve guide 11 fixed to the cylinder head 9. A notch 12 is formed at the upper end of the stem portion 4a, and a spring retainer 13 is fixed to the notch 12 via a cotter 14 so as to be immovable in the valve axial direction. The spring 8 is fitted and inserted into the stem portion 4 a, the upper end thereof is held by the spring retainer 13, and the lower end thereof is held by the spring seat 15 fixed to the cylinder head 9. The spring 8 biases the cup member 7 toward the solid cam 2 to press the cam contactor 6 against the solid cam 2 and bias the valve 4 in the closing direction. The upper surface of the cylinder head 9 has a three-dimensional cam 2
Relief recess 16 (see FIG. 3) for releasing the rotation locus of
Are formed.
【００１８】カップ部材７は、立体カム２と対向する端
壁部１８とリフタガイド穴１０に摺接する側壁部１９と
から一体成形されている。端壁部１８の上面つまりカム
対向面には、カムシャフト１の軸線とは直角の方向に長
い***部２０が一体的に設けられ、***部２０にはカム
接触子６が着座する半円筒内面座２１が凹設されてい
る。***部２０及び半円筒内面座２１はカム接触子６の
支持部を構成し、この支持部にカム接触子６がカムシャ
フト１とは直角の軸線周りで揺動可能かつバルブ４の中
心線周りで回動不能に支持されている。また、カム接触
子６の長手方向の移動を規制するために、カム接触子６
には端壁部１８の切欠２２に嵌合する突起２３が設けら
れている。The cup member 7 is integrally formed from an end wall portion 18 facing the three-dimensional cam 2 and a side wall portion 19 slidingly contacting the lifter guide hole 10. On the upper surface of the end wall portion 18, that is, on the cam facing surface, a ridge 20 that is long in a direction perpendicular to the axis of the cam shaft 1 is integrally provided, and the ridge 20 has a semi-cylindrical inner surface on which the cam contact 6 is seated. The seat 21 is recessed. The raised portion 20 and the semi-cylindrical inner surface seat 21 form a support portion for the cam contactor 6, and the cam contactor 6 can swing around the axis perpendicular to the camshaft 1 and around the centerline of the valve 4 on this support portion. It is supported so that it cannot rotate. Further, in order to regulate the movement of the cam contactor 6 in the longitudinal direction, the cam contactor 6 is
Is provided with a protrusion 23 that fits into the notch 22 of the end wall portion 18.
【００１９】一方、シリンダヘッド９のリフタガイド穴
１０には凹溝２６がカップ部材７の摺動方向に延びるよ
うに形成されている。そして、側壁部１９には穴２７が
貫設され、該穴２７を介してシリンダヘッド９に対する
カップ部材７の回転を阻止する回転阻止部材２５が取り
付けられている。回転阻止部材２５は、板バネ材からな
り、カップ部材７の内側から穴２７に挿通されて側壁部
１９の外側に突出する凸部３０と、穴２７を通過不可能
に形成され、カップ部材７の内面に取り付けられる取付
部３１とが一体形成されてなっている。On the other hand, a groove 26 is formed in the lifter guide hole 10 of the cylinder head 9 so as to extend in the sliding direction of the cup member 7. A hole 27 is formed through the side wall portion 19, and a rotation blocking member 25 that blocks rotation of the cup member 7 with respect to the cylinder head 9 is attached through the hole 27. The rotation preventing member 25 is made of a leaf spring material, and is formed so as not to be able to pass through the convex portion 30 which is inserted into the hole 27 from the inside of the cup member 7 and projects to the outside of the side wall portion 19, and the cup member 7. The mounting portion 31 mounted on the inner surface of the is integrally formed.
【００２０】凸部３０は、前板部３５と、該前板部３５
の両側端縁からそれぞれ後方に延びる側板部３６と、該
前板部３５の上端縁から後方へ延びる上板部３７とを備
えている。各側板部３６の後端縁には側方へ延びる位置
決め部３８が形成されている。取付部３１は、上板部３
７の後端縁から略垂下されたベース部４０と、該ベース
部４０の両側端縁から後方へ延び、側壁部１９の内周面
を押圧する一対の押圧部４１とを備えている。押圧部４
１は、その外面が側壁部１９の内周面に略沿って対向す
るように略弓形に折曲形成されている。The convex portion 30 includes a front plate portion 35 and the front plate portion 35.
Side plate portions 36 extending rearward from both side edges of the front plate portion 35 and upper plate portions 37 extending rearward from the upper edge of the front plate portion 35. A positioning portion 38 that extends laterally is formed at the rear end edge of each side plate portion 36. The mounting portion 31 is the upper plate portion 3.
7, a base portion 40 substantially hanging from the rear end edge, and a pair of pressing portions 41 extending rearward from both side end edges of the base portion 40 and pressing the inner peripheral surface of the side wall portion 19. Pressing part 4
1 is bent and formed in a substantially arcuate shape so that its outer surface faces substantially along the inner peripheral surface of the side wall portion 19.
【００２１】この回転阻止部材２５を取り付けるには、
一対の押圧部４１を互いに近づけるように縮め、この状
態で側壁部１９の内側に挿入する。そして、穴２７を通
過させて凸部３０を側壁部１９の外側に突出させるとと
もに、押圧部４１が端壁部１８の内面の周方向に延びる
ように配設すると取り付けが完了する。このとき、一対
の側板部３６が穴２７の内周面を押圧するので、凸部３
０の穴２７からの抜けが防止される。また、位置決め部
３８が側壁部１９の内周面に係止されることにより、凸
部３０が側壁部１９の内周面に対して位置決めされる。
また、押圧部４１が側壁部１９の内周面を押圧し、回転
阻止部材２５がカップ部材７から抜けないように該カッ
プ部材７に位置保持される。To attach the rotation preventing member 25,
The pair of pressing portions 41 are contracted so as to be close to each other, and in this state, they are inserted inside the side wall portion 19. Then, the protrusion 30 is projected through the hole 27 to the outside of the side wall portion 19, and the pressing portion 41 is arranged so as to extend in the circumferential direction of the inner surface of the end wall portion 18, whereby the attachment is completed. At this time, since the pair of side plate portions 36 press the inner peripheral surface of the hole 27, the convex portion 3
The zero hole 27 is prevented from coming off. Further, the positioning portion 38 is locked to the inner peripheral surface of the side wall portion 19, whereby the convex portion 30 is positioned with respect to the inner peripheral surface of the side wall portion 19.
Further, the pressing portion 41 presses the inner peripheral surface of the side wall portion 19, and the rotation blocking member 25 is held in position by the cup member 7 so as not to come off from the cup member 7.
【００２２】上記のように構成された可変動弁機構によ
れば、次の効果を得ることができる。
カム接触子６の支持部である***部２０及び半円筒
内面座２１が一体的に設けられたカップ部材７に、別体
の回転阻止部材２５を取り付けるようになっているの
で、端壁部１８の外側に従来のような凸部を設けなくて
もよく、側壁部１９の外周面の研削加工が容易になり、
該面の精度を確保することも容易になる。According to the variable valve mechanism constructed as described above, the following effects can be obtained. Since the rotation preventing member 25 which is a separate body is attached to the cup member 7 integrally provided with the raised portion 20 which is the support portion of the cam contactor 6 and the semi-cylindrical inner surface seat 21, the end wall portion 18 is provided. It is not necessary to provide a convex portion like that in the conventional case on the outside of the, and the outer peripheral surface of the side wall portion 19 can be easily ground,
It also becomes easy to ensure the accuracy of the surface.
【００２３】 取付部３１は、側壁部１９の内面を押
圧することによりカップ部材７に位置保持されるように
構成されているので、カップ部材７に溶接する等の固定
作業が必要がなく、簡単に組み付けることができ、作業
性が良い。Since the mounting portion 31 is configured to be held in position by the cup member 7 by pressing the inner surface of the side wall portion 19, there is no need for fixing work such as welding to the cup member 7, and it is simple. It can be assembled to and has good workability.
【００２４】次に、図５及び図６は回転阻止部材の変更
例を示すものである。この回転阻止部材５０は、取付部
５１を、その上面が端壁部１８内面に対向するようにし
て上板部３７の先端縁から両側へ円弧状に延びるように
形成し、その先端部５１ａを端壁部１８の内面に溶接固
定することにより取り付けている点において上記実施形
態と相違するものであり、その他は実質的に共通であ
る。なお、溶接は、例えば図５に示す部分５２のよう
に、カップ部材７への熱影響の少ない部分ですることが
好ましい。本実施形態によっても、上記実施形態と同様
に、上記の効果を得ることができる。Next, FIGS. 5 and 6 show a modification of the rotation blocking member. The rotation preventing member 50 has a mounting portion 51 formed so as to extend in an arc shape from the leading edge of the upper plate portion 37 to both sides so that the upper surface thereof faces the inner surface of the end wall portion 18, and the leading end portion 51 a is formed. The present embodiment is different from the above embodiment in that it is attached to the inner surface of the end wall portion 18 by welding and fixing, and other points are substantially common. In addition, it is preferable that the welding is performed on a portion having a small thermal influence on the cup member 7, such as a portion 52 shown in FIG. According to the present embodiment, the above effects can be obtained as in the above embodiment.
【００２５】なお、本発明は前記実施形態に限定される
ものではなく、発明の趣旨から逸脱しない範囲で回転阻
止部材の構成・形状やその他各部の構成・形状等を適宜
変更して具体化することもできる。The present invention is not limited to the above-described embodiment, and is embodied by appropriately changing the configuration and shape of the rotation blocking member and the configuration and shape of other parts without departing from the spirit of the invention. You can also
【００２６】[0026]
【発明の効果】本発明の可変動弁機構は、上記の通り構
成されているので、カップ部材及びカム接触子の回転阻
止構造を簡単な構成で実現することができ、側壁部の外
周面の研削加工及び精度確保を容易化できるという優れ
た効果を奏する。Since the variable valve mechanism of the present invention is configured as described above, the rotation preventing structure for the cup member and the cam contactor can be realized with a simple structure, and the outer peripheral surface of the side wall portion can be realized. It has an excellent effect of facilitating grinding and ensuring accuracy.
【図１】本発明を具体化した一実施形態の可変動弁機構
を示す斜視図である。FIG. 1 is a perspective view showing a variable valve mechanism according to an embodiment of the present invention.
【図２】同可変動弁機構の直打式バルブリフタの分解斜
視図である。FIG. 2 is an exploded perspective view of a direct drive type valve lifter of the variable valve mechanism.
【図３】（ａ）は同直打式バルブリフタの回転阻止部材
を示す平面図、（ｂ）は、同回転阻止部材のカップ部材
への取付状態を示す平断面図、（ｃ）は同直打式バルブ
リフタの平面図である。FIG. 3A is a plan view showing a rotation blocking member of the direct hitting type valve lifter, FIG. 3B is a plan sectional view showing a state where the rotation blocking member is attached to the cup member, and FIG. It is a top view of a hammering type valve lifter.
【図４】同可変動弁機構の断面図である。FIG. 4 is a sectional view of the variable valve mechanism.
【図５】同直打式バルブリフタの変更例を示す斜視図で
ある。FIG. 5 is a perspective view showing a modified example of the direct type valve lifter.
【図６】（ａ）は同直打式バルブリフタの変更例の回転
阻止部材を示す斜視図、（ｂ）は同回転阻止部材の平面
図、（ｃ）は同直打式バルブリフタの変更例の断面図で
ある。6A is a perspective view showing a rotation preventing member of a modification of the direct-acting valve lifter, FIG. 6B is a plan view of the rotation preventing member, and FIG. 6C is a modification of the direct-acting valve lifter. FIG.
【図７】従来例の可変動弁機構を示す斜視図である。FIG. 7 is a perspective view showing a conventional variable valve mechanism.
１ カムシャフト ２ 立体カム ３ 変位装置 ４ バルブ ５ 直打式バルブリフタ ６ カム接触子 ７ カップ部材 ８ スプリング ９ シリンダヘッド １０ リフタガイド穴 １８ 端壁部 １９ 側壁部 ２０ ***部 ２１ 半円筒内面座 ２５ 回転阻止部材 ２６ 凹溝 ２７ 穴 ３０ 凸部 ３１ 取付部 ４１ 押圧部 ５０ 回転阻止部材 ５１ 取付部 1 camshaft 2 three-dimensional cam 3 Displacement device 4 valves 5 Direct hit type valve lifter 6 Cam contactor 7 cup members 8 springs 9 cylinder head 10 Lifter guide hole 18 End wall 19 Side wall 20 Raised part 21 Semi-cylindrical inner seat 25 Rotation blocking member 26 groove 27 holes 30 convex 31 Mounting part 41 Pressing part 50 Rotation blocking member 51 Mounting part
フロントページの続き (72)発明者 平野 富保 愛知県西尾市中畑町浜田下10番地 株式会 社オティックス内 (72)発明者 本杉 勝彦 愛知県西尾市中畑町浜田下10番地 株式会 社オティックス内 (72)発明者 菊岡 振一郎 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 (72)発明者 川瀬 弘幸 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 (72)発明者 守谷 嘉人 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 (72)発明者 永長 秀男 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 (72)発明者 中野 修司 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 Ｆターム(参考） 3G016 AA06 BA19 BB04 CA04 CA06 CA20 CA25 CA29 CA57 DA09 GA01 3G018 AB07 AB16 BA04 BA10 DA17 DA83 DA84 DA85 GA14 Continued front page (72) Inventor Tomiho Hirano 10 Hamadashita, Nakahata-cho, Nishio-shi, Aichi Stock Association Company Otics (72) Inventor Katsuhiko Motosugi 10 Hamadashita, Nakahata-cho, Nishio-shi, Aichi Stock Association Company Otics (72) Inventor Shinichiro Kikuoka 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto Car Co., Ltd. (72) Inventor Hiroyuki Kawase 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto Car Co., Ltd. (72) Inventor Yoshito Moriya 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto Car Co., Ltd. (72) Inventor Hideo Naganaga 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto Car Co., Ltd. (72) Inventor Shuji Nakano 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto Car Co., Ltd. F-term (reference) 3G016 AA06 BA19 BB04 CA04 CA06 CA20 CA25 CA29 CA57 DA09 GA01 3G018 AB07 AB16 BA04 BA10 DA17 DA83 DA84 DA85 GA14
Claims (3)
化させた立体カムと、内燃機関の回転数等の運転状況に
応じて前記立体カムを軸方向へ変位させる変位装置と、
立体カムのカムプロフィールに基づいて往復動すること
によりバルブを開閉する直打式バルブリフタとを備えた
可変動弁機構において、 前記直打式バルブリフタは、立体カムと接触するカム接
触子と、シリンダヘッドのリフタガイド穴に摺動可能に
挿入された円筒状のカップ部材とを備え、 前記カップ部材を、立体カムと対向する端壁部とリフタ
ガイド穴に摺接する側壁部とから一体成形するとともに
該側壁部に穴を貫設し、 前記カップ部材に、該穴を介して前記側壁部の外側に突
出する凸部と、該穴を通過不可能に形成され、前記カッ
プ部材の内面に取り付けられる取付部とが一体形成され
てなる回転阻止部材を取り付け、 シリンダヘッドのリフタガイド穴に前記凸部が摺動可能
に嵌合する凹溝を形成したことを特徴とする可変動弁機
構。1. A three-dimensional cam whose cam profile is continuously changed in the axial direction, and a displacement device which displaces the three-dimensional cam in the axial direction according to operating conditions such as the rotational speed of an internal combustion engine.
A variable valve mechanism including a direct-acting valve lifter that opens and closes a valve by reciprocating based on a cam profile of a solid cam, wherein the direct-acting valve lifter includes a cam contactor that contacts the solid cam and a cylinder head. And a cylindrical cup member slidably inserted into the lifter guide hole, the cup member is integrally molded from an end wall portion facing the solid cam and a side wall portion slidingly contacting the lifter guide hole. A mounting member formed by penetrating a side wall portion with a hole, a protrusion protruding to the outside of the side wall portion through the hole, and a mounting member formed so as not to pass through the hole and attached to the inner surface of the cup member. A variable valve operating mechanism is characterized in that a rotation preventing member integrally formed with a cylinder portion is attached, and a concave groove into which the convex portion is slidably fitted is formed in a lifter guide hole of a cylinder head. .
ることにより前記カップ部材に位置保持されるように構
成された請求項１記載の可変動弁機構。2. The variable valve mechanism according to claim 1, wherein the mounting portion is configured to be held in position by the cup member by pressing the inner surface of the side wall portion.
定されることにより取り付けられるように構成された請
求項１記載の可変動弁機構。3. The variable valve mechanism according to claim 1, wherein the mounting portion is configured to be mounted by being fixed to the inner surface of the end wall portion by welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001379791A JP3985032B2 (en) | 2001-12-13 | 2001-12-13 | Variable valve mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001379791A JP3985032B2 (en) | 2001-12-13 | 2001-12-13 | Variable valve mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003184514A true JP2003184514A (en) | 2003-07-03 |
| JP3985032B2 JP3985032B2 (en) | 2007-10-03 |
Family
ID=27591163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001379791A Expired - Fee Related JP3985032B2 (en) | 2001-12-13 | 2001-12-13 | Variable valve mechanism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3985032B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006010415A1 (en) * | 2004-07-24 | 2006-02-02 | Schaeffler Kg | Tappet, which can be periodically acted upon, for a valve actuating mechanism or pump actuating mechanism |
| EP1669555A3 (en) * | 2004-12-07 | 2009-05-06 | Schaeffler KG | Valve lifter for an internal combustion engine and production method therefor |
| JP2014001706A (en) * | 2012-06-20 | 2014-01-09 | Otics Corp | Roller lifter for internal combustion engine |
-
2001
- 2001-12-13 JP JP2001379791A patent/JP3985032B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006010415A1 (en) * | 2004-07-24 | 2006-02-02 | Schaeffler Kg | Tappet, which can be periodically acted upon, for a valve actuating mechanism or pump actuating mechanism |
| EP1669555A3 (en) * | 2004-12-07 | 2009-05-06 | Schaeffler KG | Valve lifter for an internal combustion engine and production method therefor |
| JP2014001706A (en) * | 2012-06-20 | 2014-01-09 | Otics Corp | Roller lifter for internal combustion engine |
| US9422834B2 (en) | 2012-06-20 | 2016-08-23 | Otics Corporation | Roller lifter for internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3985032B2 (en) | 2007-10-03 |
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