JPH0710003Y2 - Rocker arm adjustment mechanism - Google Patents
Rocker arm adjustment mechanismInfo
- Publication number
- JPH0710003Y2 JPH0710003Y2 JP7229388U JP7229388U JPH0710003Y2 JP H0710003 Y2 JPH0710003 Y2 JP H0710003Y2 JP 7229388 U JP7229388 U JP 7229388U JP 7229388 U JP7229388 U JP 7229388U JP H0710003 Y2 JPH0710003 Y2 JP H0710003Y2
- Authority
- JP
- Japan
- Prior art keywords
- cap
- rocker arm
- spherical
- tip
- spherical head
- 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.)
- Expired - Lifetime
Links
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Description
【考案の詳細な説明】 [産業上の利用分野] この考案は吸・排気弁等を駆動するロッカアームに係
り、特に、ロッカアームの駆動量を微調整するためのロ
ッカアームの調整機構に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a rocker arm for driving an intake / exhaust valve and the like, and more particularly to a rocker arm adjustment mechanism for finely adjusting the drive amount of the rocker arm.
[従来の技術] 吸・排気弁にロッカアームの駆動力を好適に伝達させよ
うとした提案に第4図に示す本出願人提案の「ロッカア
ーム」(実開昭59−67502号公報)がある。[Prior Art] As a proposal for appropriately transmitting the driving force of the rocker arm to the intake / exhaust valve, there is a "rocker arm" (Japanese Utility Model Laid-Open No. 59-67502) proposed by the present applicant as shown in FIG.
この「ロッカアーム」は、ロッカアームaに取り付けた
微調整用のアジャストスクリューbの先端に、吸・排気
弁のステムエンドcと当接されるキャップdを揺動自在
に嵌合し、上記キャップcと上記ロッカアームa間に上
記キャップcをステムエンドd側へ付勢する弾性部材e
を設けて構成される。したがって、その弾性部材eによ
ってキャップcの揺動を好適に規制すると共に吸・排気
弁の駆動方向に対してロッカアームaの駆動力が良好に
伝達されるようになる。In this "rocker arm", a cap d that is in contact with a stem end c of an intake / exhaust valve is swingably fitted to the tip of an adjustment screw b for fine adjustment attached to the rocker arm a. An elastic member e for urging the cap c toward the stem end d side between the rocker arms a.
Is provided and configured. Therefore, the elastic member e appropriately regulates the swing of the cap c, and the driving force of the rocker arm a is favorably transmitted in the driving direction of the intake / exhaust valve.
[考案が解決しようとする課題] しかしながら、上記アジャストスクリューaの先端に対
して相対的に揺動するキャップdの運動は、アジャスト
スクリューbの先端に対して滑り運動であるから潤滑油
の供給が不足しがちな機関の始動時、あるいは低速回転
時に著しく摩耗が進行する不具合があり、課題として指
摘されていた。[Problems to be Solved by the Invention] However, since the movement of the cap d, which swings relative to the tip of the adjusting screw a, is a sliding movement with respect to the tip of the adjusting screw b, the supply of lubricating oil does not occur. It has been pointed out that there is a problem that wear tends to progress remarkably at the time of starting the engine or at low speed rotation, which tends to be insufficient.
[課題を解決するための手段] この考案は上記課題を解決することを目的とし、ロッカ
アームのアジャストスクリュー先端に、弁棒の後端と当
接されるキャップが揺動自在に嵌合された球面頭部を形
成し、その球面頭部の先端が接する上記キャップの内底
を平滑面で、キャップ及び上記球面頭部の周側球面部相
互をトロコイド曲線からなる曲面で形成してロッカアー
ムの調整機構を構成したものである。[Means for Solving the Problems] The present invention is intended to solve the above problems, and a spherical surface in which a cap that is brought into contact with a rear end of a valve rod is swingably fitted to a tip of an adjusting screw of a rocker arm. A rocker arm adjusting mechanism is formed by forming a head portion, the inner bottom of the cap with which the tip of the spherical head portion is in contact is a smooth surface, and the circumferential spherical portion of the cap and the spherical head portion is a curved surface formed of a trochoidal curve. Is configured.
[作用] キャップの内底を平滑面に形成すると、ロッカアームの
駆動時の球面頭部とキャップとの揺動支点は、キャップ
の上部側に位置されるようになる。この結果、球面頭部
の先端は平滑面に対して相対的にトロコイド曲線運動す
るようになる。一方上記キャップの内底を平滑面で、キ
ャップ及び上記球面頭部の周側球面部相互をトロコイド
曲線からなる曲面で形成したからトロコイド曲線運動が
より円滑なものとなる。この結果球面頭部の摩耗(フレ
ッティング摩耗)が抑制される。[Operation] When the inner bottom of the cap is formed into a smooth surface, the swinging fulcrum between the spherical head and the cap when the rocker arm is driven is located on the upper side of the cap. As a result, the tip of the spherical head moves in a trochoidal curve relative to the smooth surface. On the other hand, since the inner bottom of the cap is formed as a smooth surface and the cap and the spherical surface on the circumferential side of the spherical head are formed as a curved surface formed of a trochoid curve, the trochoid curve movement becomes smoother. As a result, wear of the spherical head (fretting wear) is suppressed.
[実施例] 以下にこの考案の好適一実施例を添付図面に基づいて説
明する。[Embodiment] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.
第1図に示す1はカムまたはタペット等で駆動されるロ
ッカアームで、このロッカアーム1の作用点側となるア
ーム2には先端に球面頭部4を一体的に有したアジャス
トスクリュー5が螺合して設けられており、その球面頭
部4には、吸気または排気弁等の弁棒6の後端7と当接
されるキャップ8が揺動自在に嵌合されている。実施例
にあってキャップ8は、第2図に示してあるように上記
球面頭部4の周側球面部9の先端側と摺動嵌合する所定
の曲率を有して周側面10を形成した筒状のインサート部
材11と、このインサート部材11を一体的に嵌合すると共
に、上記球面頭部4の先端の球面部13が接する平滑面14
を形成するカップ状のキャップ本体15とから構成され、
先端の球面部13は、上記周側球面部9に対して大きな曲
率を有して形成される。Reference numeral 1 shown in FIG. 1 is a rocker arm that is driven by a cam or tappet or the like, and an adjusting screw 5 having a spherical head 4 integrally at the tip is screwed into an arm 2 that is the point of action of the rocker arm 1. A cap 8 which is brought into contact with a rear end 7 of a valve rod 6 such as an intake or exhaust valve is swingably fitted to the spherical head portion 4. In the embodiment, as shown in FIG. 2, the cap 8 has a peripheral side surface 10 having a predetermined curvature that is slidably fitted to the tip side of the peripheral spherical surface portion 9 of the spherical head 4. The cylindrical insert member 11 and the insert member 11 are integrally fitted, and the smooth surface 14 with which the spherical surface portion 13 at the tip of the spherical head portion 4 is in contact.
And a cup-shaped cap body 15 that forms a
The spherical portion 13 at the tip is formed to have a large curvature with respect to the peripheral spherical portion 9.
さて上記キャップ8は、その周側面10がX,Y,Zの三軸方
向に対してZ軸方向のトロコイド曲線の円周方向の連続
からなる曲面で形成してあり、この曲面を摺動運動する
球面頭部の周側球面部9もまたZ軸方向のトロコイド曲
線の連続からなる曲面で形成してある。The cap 8 has a circumferential side surface 10 formed by a curved surface formed by a continuous trochoidal curve in the Z-axis direction in the circumferential direction with respect to the three X-, Y-, and Z-axis directions. The spherical portion 9 on the peripheral side of the spherical head is also formed by a curved surface formed by continuous trochoidal curves in the Z-axis direction.
ところで、インサート部材11の固定は、キャップ本体15
にインサート部材11を嵌合した後、キャップ本体15の上
端部を半径方向内方でかつ下向きに折り曲げること(カ
シメ処理)によりなされる。また、インサート部材11の
硬度(表面硬度)は上記周側球面部9に対して高くなる
材料で形成されるか、または、表面処理を施してある。
17はインサート部材11の周側球面部9の上部に形成され
たリップ部で、18はそのリップ部17と係合し、キャップ
8の揺動限界を定めるノッチ部分である。第3図はキャ
ップ8に対するアジャストスクリュー5の相対運動を示
した解析図である。By the way, the fixing of the insert member 11 is performed by the cap body 15
After the insert member 11 is fitted to, the upper end of the cap body 15 is bent inward in the radial direction and downward (caulking process). Further, the hardness (surface hardness) of the insert member 11 is formed of a material that is higher than that of the peripheral spherical surface portion 9 or is surface-treated.
Reference numeral 17 denotes a lip portion formed on the upper portion of the peripheral spherical surface portion 9 of the insert member 11, and reference numeral 18 denotes a notch portion that engages with the lip portion 17 and determines the swing limit of the cap 8. FIG. 3 is an analysis diagram showing the relative movement of the adjusting screw 5 with respect to the cap 8.
同図に示してあるように、アジャストスクリュー5を相
対的に揺動させると、先端の球面部13が平滑面14上をこ
ろがるように移動するトロコイド曲線運動を行うことが
確認できる。また、このときノッチ部分18側を支点とし
て周側球面部9がインサート部材11の周側面10に沿って
トロコイド曲線運動(摺動)することも確認することが
できる。As shown in the figure, it can be confirmed that when the adjusting screw 5 is relatively swung, the spherical portion 13 at the tip end makes a trochoidal curve movement so as to roll on the smooth surface 14. At this time, it can also be confirmed that the peripheral spherical surface portion 9 moves (slides) along the peripheral side surface 10 of the insert member 11 with the notch portion 18 as a fulcrum.
[考案の効果] 以上説明したことから明らかなようにこの考案によれば
ロッカアームのアジャストスクリュー先端に、弁棒の後
端と当接されるキャップが揺動自在に嵌合された球面頭
部を形成し、球面頭部の先端が接する上記キャップの内
底を平滑面で、キャップ及び上記球面頭部の周側球面部
相互をトロコイド曲線からなる曲面で形成したから、ト
ロコイド運動する球面頭部に対してキャップも円滑にト
ロコイド運動させることが可能になり、平滑面に接する
球面頭部の摩耗を防止することができ、アジャストスク
リュのクリアランス調節値を一定に維持することができ
る。[Effects of the Invention] As is apparent from the above description, according to the present invention, a spherical head having a cap that abuts the rear end of the valve rod is swingably fitted to the tip of the adjusting screw of the rocker arm. Since the inner bottom of the cap with which the tip of the spherical head is in contact is a smooth surface and the peripheral spherical parts of the cap and the spherical head are curved surfaces composed of trochoidal curves, a spherical head that moves trochoidally is formed. On the other hand, the cap can be smoothly moved in a trochoid manner, wear of the spherical head portion in contact with the smooth surface can be prevented, and the clearance adjustment value of the adjusting screw can be kept constant.
第1図はこの考案の好適一実施例を示す概略図、第2図
は第1図の要部詳細図、第3図はアジャストスクリュー
とキャップとの相対運動を示す解析図、第4図は従来例
としてのロッカアームを示す概略図である。 図中、1はロッカアーム、5はアジャストスクリュー、
8はキャップ、11はインサート部材、15はキャップ本体
である。FIG. 1 is a schematic view showing a preferred embodiment of the present invention, FIG. 2 is a detailed view of essential parts of FIG. 1, FIG. 3 is an analysis view showing relative movement between an adjusting screw and a cap, and FIG. It is the schematic which shows the rocker arm as a prior art example. In the figure, 1 is a rocker arm, 5 is an adjusting screw,
Reference numeral 8 is a cap, 11 is an insert member, and 15 is a cap body.
Claims (1)
に、弁棒の後端と当接されるキャップが揺動自在に嵌合
された球面頭部を形成し、該頭部の先端が接する上記キ
ャップの内底を平滑面で、キャップ及び上記球面頭部の
周側球面部相互をトロコイド曲線からなる曲面で形成し
たことを特徴とするロッカアームの調整機構。1. A spherical head having a cap that abuts against a rear end of a valve rod is swingably fitted at the tip of an adjusting screw of a rocker arm, and the tip of the head is in contact with the inside of the cap. An adjusting mechanism for a rocker arm, wherein the bottom is a smooth surface, and the cap and the spherical surface on the peripheral side of the spherical head are formed by a curved surface composed of a trochoidal curve.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7229388U JPH0710003Y2 (en) | 1988-05-31 | 1988-05-31 | Rocker arm adjustment mechanism |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7229388U JPH0710003Y2 (en) | 1988-05-31 | 1988-05-31 | Rocker arm adjustment mechanism |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01176701U JPH01176701U (en) | 1989-12-18 |
JPH0710003Y2 true JPH0710003Y2 (en) | 1995-03-08 |
Family
ID=31297465
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7229388U Expired - Lifetime JPH0710003Y2 (en) | 1988-05-31 | 1988-05-31 | Rocker arm adjustment mechanism |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0710003Y2 (en) |
-
1988
- 1988-05-31 JP JP7229388U patent/JPH0710003Y2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH01176701U (en) | 1989-12-18 |
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