JP2002021512A - Valve system of engine - Google Patents
Valve system of engineInfo
- Publication number
- JP2002021512A JP2002021512A JP2000203077A JP2000203077A JP2002021512A JP 2002021512 A JP2002021512 A JP 2002021512A JP 2000203077 A JP2000203077 A JP 2000203077A JP 2000203077 A JP2000203077 A JP 2000203077A JP 2002021512 A JP2002021512 A JP 2002021512A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- rocker arm
- rocker
- stem
- shaft
- 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
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は，シリンダヘッドに
ロッカ軸を介して揺動自在に支持されて，カム軸により
揺動されるロッカアームを備え，このロッカアームの揺
動端部を，シリンダヘッドに摺動自在に支持されるバル
ブのステムの端部に当接させた，エンジンの動弁装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a rocker arm which is swingably supported by a cylinder head via a rocker shaft and which is rocked by a camshaft. A rocking end of the rocker arm is attached to the cylinder head. The present invention relates to a valve train for an engine, which is in contact with an end of a stem of a slidably supported valve.
【０００２】[0002]
【従来の技術】従来のかゝるエンジンの動弁装置は，図
３に示すように，ロッカ軸０１２に揺動自在に支持され
るロッカアーム０１３と，このロッカアーム０１３の一
端部に摺接するカム軸０１４とを備え，そのロッカアー
ム０１３の他端部に螺着される調整ボルト２０の先端に
凸状球面０８を形成し，この球面０８を，バルブ０４の
ステム０４ｂの端部に形成した平坦面０１７に当接さ
せ，この当接部を介してバルブ０４に開閉動作を与える
ようになっている（例えば，特許２７５７３１８号公報
参照）。かゝる構成によれば，ロッカアーム及びバルブ
ステムの当接部の摩擦を少なくして，バルブの開閉をス
ムーズに行うことができる。2. Description of the Related Art As shown in FIG. 3, a conventional valve train for such an engine includes a rocker arm 013 swingably supported by a rocker shaft 012 and a cam shaft 014 slidingly in contact with one end of the rocker arm 012. A convex spherical surface 08 is formed at the tip of the adjustment bolt 20 screwed to the other end of the rocker arm 013, and this spherical surface 08 is formed on a flat surface 017 formed at the end of the stem 04 b of the valve 04. The opening and closing operation is applied to the valve 04 via the contact portion (see, for example, Japanese Patent No. 2757318). According to such a configuration, the friction between the contact portion of the rocker arm and the valve stem can be reduced, and the opening and closing of the valve can be performed smoothly.
【０００３】[0003]
【発明が解決しようとする課題】ところで，上記従来装
置の構成では，ロッカ軸０１２とバルブ０４との軸間距
離Ｓが一定であっても，ロッカ軸０１２と凸状球面０８
の中心Ｏとの間の距離Ｌに誤差があると，ロッカアーム
０１３の有効腕長さが変化することになり，そのような
変化は，バルブ０４の開閉ストロークに多少とも影響を
及ぼすのもので，好ましくない。したがって，ロッカア
ーム０１３，特に凸状球面０８を有する部分は，上記の
ような誤差を極力小さくするために高精度に加工しなけ
ればならないが，それはコスト面では不利となる。By the way, in the configuration of the above-mentioned conventional apparatus, even if the center distance S between the rocker shaft 012 and the valve 04 is constant, the rocker shaft 012 and the convex spherical surface 08 are not fixed.
If there is an error in the distance L from the center O of the rocker arm, the effective arm length of the rocker arm 013 changes, and such a change has some influence on the opening / closing stroke of the valve 04. Not preferred. Therefore, the portion having the rocker arm 013, particularly the portion having the convex spherical surface 08, must be processed with high precision in order to minimize the above error, but this is disadvantageous in cost.
【０００４】本発明は，かゝる事情に鑑みてなされたも
ので，ロッカ軸とバルブとの軸間距離を一定にすれば，
自ずからロッカ軸の軸線と凸状球面の中心との間の距離
も定まるようにして，製作コストの低減に寄与し得る，
前記エンジンの動弁装置を提供することを目的とする。[0004] The present invention has been made in view of such circumstances, and if the distance between the rocker shaft and the valve is kept constant,
By naturally determining the distance between the axis of the rocker shaft and the center of the convex spherical surface, it can contribute to a reduction in manufacturing costs.
It is an object to provide a valve train for the engine.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に，本発明は，シリンダヘッドにロッカ軸を介して揺動
自在に支持されて，カム軸により揺動されるロッカアー
ムを備え，このロッカアームの揺動端部を，シリンダヘ
ッドに摺動自在に支持されるバルブのステムの端部に当
接させた，エンジンの動弁装置において，ロッカアーム
の揺動端部に平坦面を形成する一方，この平坦面に当接
する凸状球面を，その球面中心がバルブの軸線上に来る
ようにバルブのステムの端部に形成したことを第１の特
徴とする。In order to achieve the above object, the present invention provides a rocker arm which is swingably supported by a cylinder head via a rocker shaft and is swung by a cam shaft. The rocking end of the rocker arm has a flat surface at the rocking end of the rocker arm in the valve operating device of the engine, in which the rocking end of the rocker arm is brought into contact with the end of the stem of the valve slidably supported on the cylinder head. A first feature is that a convex spherical surface which comes into contact with the flat surface is formed at an end of the stem of the valve such that the center of the spherical surface is on the axis of the valve.
【０００６】この第１の特徴によれば，バルブのステム
の端部に形成される凸状球面の中心は，該ステムの軸線
上に位置するので，ロッカ軸とバルブとの軸間距離を一
定にしさえすれば，自ずからロッカ軸の軸線と球面の中
心との間の距離は一義的定まることになる。したがっ
て，ロッカ軸の軸線と球面の中心との間の距離の精度管
理は不要となり，製作コストの低減を図ることができ
る。According to the first feature, since the center of the convex spherical surface formed at the end of the stem of the valve is located on the axis of the stem, the center distance between the rocker shaft and the valve is fixed. By doing so, the distance between the axis of the rocker axis and the center of the spherical surface is naturally determined. Therefore, it is not necessary to control the accuracy of the distance between the axis of the rocker shaft and the center of the spherical surface, and the manufacturing cost can be reduced.
【０００７】また本発明は，第１の特徴に加えて，前記
ロッカアームを１枚の鋼板製とすると共に，相対向する
一対の側壁部と，これら側壁部間を一体に連結する底壁
部とで構成し，両側壁部に，前記ロッカ軸に回転自在に
嵌合する軸孔を形成し，底壁部に前記平坦面を形成した
ことを第２の特徴とする。In addition to the first feature, the present invention provides the rocker arm made of a single steel plate, a pair of opposed side walls, and a bottom wall integrally connecting the side walls. The second feature is that a shaft hole rotatably fitted to the rocker shaft is formed in both side wall portions, and the flat surface is formed in a bottom wall portion.
【０００８】この第２の特徴によれば，両側壁部と底壁
部とで断面係数の大きく，曲げ剛性の高いロッカアーム
を構成することができ，しかもこれをプレス加工により
容易に製作することができ，またロッカアームには球面
を成形する必要がないから，プレス金型の製作も簡単と
なり，製作コストの更なる低減を図ることができる。According to the second feature, a rocker arm having a large section modulus and a high bending rigidity can be constituted by both side walls and a bottom wall, and can be easily manufactured by press working. Also, since it is not necessary to form a spherical surface on the rocker arm, the production of the press die is simplified, and the production cost can be further reduced.
【０００９】[0009]
【発明の実施の形態】本発明の実施の形態を，添付図面
に示す本発明の一実施例に基づいて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on one embodiment of the present invention shown in the accompanying drawings.
【００１０】図１は本発明の動弁装置を備えたエンジン
の一部縦断側面図，図２は図１の２−２線断面図であ
る。FIG. 1 is a partially longitudinal side view of an engine provided with the valve train of the present invention, and FIG. 2 is a sectional view taken along line 2-2 of FIG.
【００１１】これら図面において，エンジンのシリンダ
ヘッド１は，燃焼室２と，この燃焼室２に開口する吸気
又は排気用のポート３とを有しており，そのポート３は
バルブ４によって開閉される。このバルブ４は，ポート
３の燃焼室２への開口部に埋設されたバルブシート５に
着座する傘部４ａと，シリンダヘッド１に固設されたバ
ルブガイド６に摺動自在に支持されるステム４ｂとから
なっており，これら傘部４ａ及びステム４ｂは，対向端
面７で相互に溶接される。そのステム４ｂの上端面は凸
状球面８に形成される。その際，球面８は，その中心Ｏ
がバルブ４の軸線Ａ上に来るように形成される。このよ
うな球面８の形成は，切削や鍛造により容易に行うこと
ができる。In these drawings, a cylinder head 1 of an engine has a combustion chamber 2 and an intake or exhaust port 3 opening to the combustion chamber 2, and the port 3 is opened and closed by a valve 4. . The valve 4 has an umbrella portion 4a seated on a valve seat 5 embedded in an opening of the port 3 to the combustion chamber 2, and a stem slidably supported by a valve guide 6 fixed to the cylinder head 1. 4b, and the umbrella portion 4a and the stem 4b are welded to each other at the facing end surface 7. The upper end surface of the stem 4b is formed as a convex spherical surface 8. At that time, the spherical surface 8 has its center O
Are formed on the axis A of the valve 4. Such a spherical surface 8 can be easily formed by cutting or forging.
【００１２】ステム４ｂの上端部外周にはリテーナ９が
付設され，このリテーナ９とシリンダヘッド１との間
に，バルブ４を閉じ方向に付勢するバルブスプリング１
０が縮設される。A retainer 9 is attached to the outer periphery of the upper end of the stem 4b. A valve spring 1 for urging the valve 4 in the closing direction is provided between the retainer 9 and the cylinder head 1.
0 is reduced.
【００１３】上記バルブスプリング１０と協働してバル
ブ４を開閉作動する本発明の動弁装置１１がシリンダヘ
ッド１に配設される。この動弁装置１１は，シリンダヘ
ッド１に固定して取り付けられるロッカ軸１２と，この
ロッカ軸１２に基端部を回動自在に支持されて揺動端部
を前記ステム４ｂの上端部に当接させるロッカアーム１
３と，シリンダヘッド１に回転自在に支持され，ロッカ
アーム１３の上面に摺接するカム１４ａを有するカム軸
１４とから構成され，このカム軸１４は，図示しないク
ランク軸から駆動される。A valve operating device 11 according to the present invention for opening and closing the valve 4 in cooperation with the valve spring 10 is provided on the cylinder head 1. The valve gear 11 has a rocker shaft 12 fixedly attached to the cylinder head 1 and a base end rotatably supported by the rocker shaft 12 so that a swinging end abuts on an upper end of the stem 4b. Rocker arm 1 to contact
3 and a camshaft 14 rotatably supported by the cylinder head 1 and having a cam 14a slidably in contact with the upper surface of the rocker arm 13. The camshaft 14 is driven by a crankshaft (not shown).
【００１４】上記ロッカアーム１３は１枚の鋼板をプレ
ス加工して成形したものであって，相対向する一対の側
壁部１３ａ，１３ａと，これら側壁部１３ａ，１３ａ間
を一体に連結する底壁部１３ｂとからなっている。その
両側壁部１３ａ，１３ａの一端部に，前記ロッカ軸１２
に回転自在に嵌合する軸孔１５，１５が穿設され，また
両側壁部１３ａ，１３ａの上縁に，前記カム１４ａが摺
接する円弧状のスリッパ面１６が形成される。また底壁
部１３ｂには平坦面１７が形成され，これが前記ステム
４ｂの凸状球面８に当接するようになっている。The rocker arm 13 is formed by pressing a single steel plate, and is formed of a pair of opposing side walls 13a, 13a, and a bottom wall which integrally connects the side walls 13a, 13a. 13b. The rocker shaft 12 is attached to one end of each side wall 13a.
Shaft holes 15 and 15 are rotatably fitted to the shaft, and an arc-shaped slipper surface 16 with which the cam 14a slides is formed on the upper edge of both side walls 13a and 13a. Further, a flat surface 17 is formed on the bottom wall portion 13b, and this flat surface 17 comes into contact with the convex spherical surface 8 of the stem 4b.
【００１５】次に，この実施例の作用について説明す
る。Next, the operation of this embodiment will be described.
【００１６】カム軸１４が回転すると，スリッパ面１６
に摺接するカム１４ａの回転によりロッカアーム１３を
ロッカ軸１２周りに揺動させ，その揺動力は，互いに当
接する平坦面１７及び凸状上球面８を介してバルブ４に
伝達し，バルブスプリング１０の戻し力と協働しなが
ら，バルブ４に開閉動作を与えることができる。When the camshaft 14 rotates, the slipper surface 16
The rocker arm 13 is swung around the rocker shaft 12 by the rotation of the cam 14a that slides on the rocker shaft 12, and the rocking force is transmitted to the valve 4 via the flat surface 17 and the convex upper spherical surface 8 which are in contact with each other. The opening and closing operation can be applied to the valve 4 while cooperating with the return force.
【００１７】ところで，バルブ４のステム４ｂの上端部
に形成された凸状球面８の中心Ｏはバルブ４の軸線Ａ上
に位置しているので，ロッカ軸１２の軸線Ｂとバルブ４
の軸線Ａとの間の距離Ｓを一定にしさえすれば，自ずか
らロッカ軸１２の軸線Ｂと球面８の中心Ｏとの間の距離
Ｌは一義的に定まることになる。したがって，ロッカ軸
１２の軸線Ｂと球面８の中心Ｏとの間の距離Ｌの精度管
理は不要となり，製作コストの低減を図ることができ
る。The center O of the convex spherical surface 8 formed on the upper end of the stem 4b of the valve 4 is located on the axis A of the valve 4, so that the axis B of the rocker shaft 12 is
The distance L between the axis B of the rocker shaft 12 and the center O of the spherical surface 8 is naturally determined as long as the distance S between the axis A and the center line A is kept constant. Therefore, it is not necessary to control the accuracy of the distance L between the axis B of the rocker shaft 12 and the center O of the spherical surface 8, and the production cost can be reduced.
【００１８】かくして，ロッカ軸１２の軸線Ｂと球面８
の中心Ｏとの間の距離Ｌのばらつきはなくなり，ロッカ
アーム１３の有効長さを常に一定とすることができるた
め，バルブ４の開閉ストロークを安定化させることがで
きる。Thus, the axis B of the rocker shaft 12 and the spherical surface 8
And the effective length of the rocker arm 13 can be kept constant at all times, so that the opening and closing stroke of the valve 4 can be stabilized.
【００１９】また１枚の鋼板からなるロッカアーム１３
は，相対向する一対の側壁部１３ａ，１３ａと，それら
を相互に一体に連結する底壁部１３ｂとで構成されるの
で，大なる断面係数を得て，曲げ剛性が強化されると共
に軽量化される。しかもこのロッカアーム１３はプレス
加工により容易に製作することができ，また底壁部１３
ｂには球面を成形する必要がないから，プレス金型の製
作も簡単となり，製作コストの更なる低減に寄与し得
る。The rocker arm 13 made of one steel plate
Is composed of a pair of opposed side wall portions 13a, 13a and a bottom wall portion 13b connecting them integrally, so that a large section modulus is obtained, the bending rigidity is enhanced, and the weight is reduced. Is done. Moreover, the rocker arm 13 can be easily manufactured by press working, and the bottom wall 13
Since it is not necessary to form a spherical surface for b, the production of the press die is simplified, which can contribute to a further reduction in the production cost.
【００２０】本発明は，上記実施例に限定されるもので
はなく，その要旨の範囲を逸脱することなく種々の設計
変更が可能である。The present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the scope of the gist.
【００２１】[0021]
【発明の効果】以上のように本発明の第１の特徴によれ
ば，シリンダヘッドにロッカ軸を介して揺動自在に支持
されて，カム軸により揺動されるロッカアームを備え，
このロッカアームの揺動端部を，シリンダヘッドに摺動
自在に支持されるバルブのステムの端部に当接させた，
エンジンの動弁装置において，ロッカアームの揺動端部
に平坦面を形成する一方，この平坦面に当接する凸状球
面を，その球面中心がバルブの軸線上に来るようにバル
ブのステムの端部に形成したので，ロッカ軸の軸線と球
面の中心との間の距離の精度管理を行わずとも，その間
の距離のばらつきをなくすることができ，製作コストの
低減を図ることができる。As described above, according to the first aspect of the present invention, a rocker arm which is swingably supported by a cylinder head via a rocker shaft and is swung by a cam shaft is provided.
The swinging end of the rocker arm was brought into contact with the end of the stem of the valve slidably supported by the cylinder head.
In a valve gear for an engine, a flat surface is formed at the rocking end of the rocker arm, and a convex spherical surface that abuts the flat surface is formed by adjusting the end of the stem of the valve so that the center of the spherical surface is on the axis of the valve. Therefore, even if the precision of the distance between the axis of the rocker shaft and the center of the spherical surface is not controlled, the variation in the distance therebetween can be eliminated, and the manufacturing cost can be reduced.
【００２２】また本発明の第２の特徴によれば，前記ロ
ッカアームを１枚の鋼板製とすると共に，相対向する一
対の側壁部と，これら側壁部間を一体に連結する底壁部
とで構成し，両側壁部に，前記ロッカ軸に回転自在に嵌
合する軸孔を形成し，底壁部に前記平坦面を形成したの
で，両側壁部と底壁部とで断面係数が大きく，曲げ剛性
も高く且つ軽量なロッカアームを構成することができ，
しかもこれをプレス加工により容易に製作することがで
き，またロッカアームには球面を成形する必要がないか
ら，プレス金型の製作も簡単となり，製作コストの更な
る低減を図ることができる。According to a second feature of the present invention, the rocker arm is made of a single steel plate, and includes a pair of opposed side walls and a bottom wall integrally connecting the side walls. Since the shaft holes are formed in both side walls so as to be rotatably fitted to the rocker shaft, and the flat surface is formed in the bottom wall, the cross section coefficient is large between the both side walls and the bottom wall. A rocker arm with high bending rigidity and light weight can be constructed.
In addition, this can be easily manufactured by press working, and since it is not necessary to form a spherical surface on the rocker arm, the manufacturing of the press die is simplified, and the manufacturing cost can be further reduced.
【図１】本発明の動弁装置を備えたエンジンの一部縦断
側面図。FIG. 1 is a partially longitudinal side view of an engine provided with a valve train of the present invention.
【図２】図１の２−２線断面図。FIG. 2 is a sectional view taken along line 2-2 of FIG.
【図３】従来の動弁装置の側面図。FIG. 3 is a side view of a conventional valve train.
１・・・・・シリンダヘッド ４・・・・・バルブ ４ｂ・・・・バルブのステム ８・・・・・凸状球面 １２・・・・ロッカ軸 １３・・・・ロッカアーム １３ａ・・・側壁部 １３ｂ・・・底壁部 １４・・・・カム軸 １５・・・・軸孔 １７・・・・平坦面 1 Cylinder head 4 Valve 4b Valve stem 8 Convex spherical surface 12 Rocker shaft 13 Rocker arm 13a Side wall Part 13b Bottom wall part 14 Camshaft 15 Shaft hole 17 Flat surface
フロントページの続き (72)発明者 枝松 茂貴 埼玉県和光市中央１丁目４番１号 株式会 社本田技術研究所内 Ｆターム(参考） 3G016 AA06 BA01 BB21 BB24 CA01 CA04 CA06 CA08 EA01 EA02 FA07 GA00 Continued on the front page (72) Inventor Shigeki Edamatsu 1-4-1 Chuo, Wako-shi, Saitama F-term in Honda R & D Co., Ltd. (Reference) 3G016 AA06 BA01 BB21 BB24 CA01 CA04 CA06 CA08 EA01 EA02 FA07 GA00
Claims (2)
２）を介して揺動自在に支持されて，カム軸（１４）に
より揺動されるロッカアーム（１３）を備え，このロッ
カアーム（１３）の揺動端部を，シリンダヘッド（１）
に摺動自在に支持されるバルブ（４）のステム（４ｂ）
の端部に当接させた，エンジンの動弁装置において，ロ
ッカアーム（１３）の揺動端部に平坦面（１７）を形成
する一方，この平坦面（１７）に当接する凸状球面
（８）を，その球面中心（Ｏ）がバルブ（４）の軸線
（Ａ）上に来るようにバルブ（４）のステム（４ｂ）の
端部に形成したことを特徴とする，エンジンの動弁装
置。A rocker shaft (1) is attached to a cylinder head (1).
2) a rocker arm (13) swingably supported by a camshaft (14) via a rocker arm (13), and a rocking end of the rocker arm (13) is connected to the cylinder head (1).
(4b) of the valve (4) slidably supported on the stem
In the valve operating device of the engine, the flat surface (17) is formed at the swinging end of the rocker arm (13), while the convex spherical surface (8) is in contact with the flat surface (17). ) Is formed at the end of the stem (4b) of the valve (4) such that its spherical center (O) is on the axis (A) of the valve (4). .
いて，前記ロッカアーム（１３）を１枚の鋼板製とする
と共に，相対向する一対の側壁部（１３ａ）と，これら
側壁部（１３ａ）間を一体に連結する底壁部（１３ｂ）
とで構成し，両側壁部（１３ａ）に，前記ロッカ軸（１
２）に回転自在に嵌合する軸孔（１５）を形成し，底壁
部（１３ｂ）に前記平坦面（１７）を形成したことを特
徴とする，エンジンの動弁装置。2. A valve train for an engine according to claim 1, wherein said rocker arm (13) is made of one sheet of steel, and a pair of opposed side walls (13a) and said side walls (13a). Bottom wall (13b) that connects the spaces together
The rocker shaft (1) is provided on both side walls (13a).
A valve gear for an engine, wherein a shaft hole (15) for rotatably fitting is formed in 2), and the flat surface (17) is formed in a bottom wall portion (13b).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000203077A JP4216992B2 (en) | 2000-06-30 | 2000-06-30 | Engine valve gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000203077A JP4216992B2 (en) | 2000-06-30 | 2000-06-30 | Engine valve gear |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002021512A true JP2002021512A (en) | 2002-01-23 |
| JP4216992B2 JP4216992B2 (en) | 2009-01-28 |
Family
ID=18700521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000203077A Expired - Fee Related JP4216992B2 (en) | 2000-06-30 | 2000-06-30 | Engine valve gear |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4216992B2 (en) |
-
2000
- 2000-06-30 JP JP2000203077A patent/JP4216992B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP4216992B2 (en) | 2009-01-28 |
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