JP2838471B2 - Pivot device for boat-shaped rocker arm of valve train of overhead valve engine - Google Patents
Pivot device for boat-shaped rocker arm of valve train of overhead valve engineInfo
- Publication number
- JP2838471B2 JP2838471B2 JP18767393A JP18767393A JP2838471B2 JP 2838471 B2 JP2838471 B2 JP 2838471B2 JP 18767393 A JP18767393 A JP 18767393A JP 18767393 A JP18767393 A JP 18767393A JP 2838471 B2 JP2838471 B2 JP 2838471B2
- Authority
- JP
- Japan
- Prior art keywords
- rocker arm
- boat
- shaped rocker
- valve
- receiving
- 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
【０００１】[0001]
【産業上の利用分野】本発明は頭上弁エンジンの動弁装
置の舟形ロッカアームの枢支装置に関し、ロッカアーム
の揺動枢支部の潤滑性能を高め、枢支装置の耐摩耗性を
向上できるものを提供する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pivoting device for a boat-shaped rocker arm of a valve gear for an overhead valve engine, and more particularly to a device capable of improving the lubricating performance of a rocking arm of a rocker arm and improving the wear resistance of the pivoting device. provide.
【０００２】[0002]
【発明の背景】一般に、頭上弁エンジンの動弁装置で
は、ロッカアームを鋳造物から板金製の舟形ロッカアー
ムに置き換えて、装置全体の製造コストを低減すること
が少なくない。2. Description of the Related Art In general, in a valve train of an overhead valve engine, it is often the case that the rocker arm is replaced with a boat-shaped rocker arm made of sheet metal from a cast product, thereby reducing the manufacturing cost of the entire machine.
【０００３】本発明はこの頭上弁エンジンの動弁装置の
舟形ロッカアームの枢支装置を発明の対象とし、その基
本構造は、図１又は図５に示すように、頭上弁エンジン
Ｅのロッカアーム室１内で、支柱２をシリンダヘッド１
７から上向きに立設し、支柱２に外嵌させた枢支具３を
受け止め具４で上側から受け止め、枢支具３の下面に凸
曲面状の受け面５を設け、舟形ロッカアーム６の一端の
入力部７にプッシュロッド１１の出力部１１ａを押圧可
能に接当し、その他端の出力部８を吸排気弁１２の入力
部１２ａに押圧可能に接当し、その中央部に曲面状の押
し当て面１０を凹設し、この舟形ロッカアーム６の押し
当て面１０を枢支具３の受け面５に下側から揺動自在に
接当させて構成した形式のものである。[0003] The present invention is directed to a pivoting device for a boat-shaped rocker arm of the valve operating device for an overhead valve engine, and its basic structure is, as shown in FIG. 1 or FIG. Within, the support 2 is connected to the cylinder head 1
7, the pivotal support 3 externally fitted to the column 2 is received from above by a stopper 4, and a convex curved receiving surface 5 is provided on the lower surface of the pivotal support 3, and one end of a boat-shaped rocker arm 6 is provided. The output portion 11a of the push rod 11 is pressably contacted with the input portion 7 of the push rod, and the output portion 8 at the other end is pressably contacted with the input portion 12a of the intake and exhaust valve 12. The pressing surface 10 is recessed, and the pressing surface 10 of the boat-shaped rocker arm 6 is swingably contacted with the receiving surface 5 of the pivotal support 3 from below.
【０００４】[0004]
【従来の技術】この形式の従来技術としては、図５に示
すように、中実状の枢支具３の下寄り側に半球面状の受
け面５を形成し、当該枢支具３を支柱ボルト２に外嵌さ
せて受け止めナット４で上から受け止め、支持し、舟形
ロッカアーム６の半球面状の押し当て面１０を枢支具３
の受け面５に下側から押し当てたものがある。尚、符号
１６は受け止めナット４に接当するロックナットであ
る。2. Description of the Related Art As a prior art of this type, as shown in FIG. 5, a hemispherical receiving surface 5 is formed on the lower side of a solid pivotal support 3, and the pivotal support 3 is supported by a column. The hemispherical pressing surface 10 of the boat-shaped rocker arm 6 is pivotally attached to the bolt 2 by receiving it from above with the receiving nut 4 and supporting it.
Is pressed against the receiving surface 5 from below. Reference numeral 16 denotes a lock nut that contacts the receiving nut 4.
【０００５】[0005]
【発明が解決しようとする課題】上記従来技術では、中
実状の枢支具３は剛体であり、揺動する舟形ロッカアー
ム６の押し当て面１０は枢支具３の受け面５に常時全面
接当するので、舟形ロッカアーム６と枢支具３との間の
揺動用摺擦部１３に潤滑油が奥までスムーズに侵入でき
ず、潤滑性能が不充分になる虞れがある。In the prior art described above, the solid pivotal support 3 is rigid, and the pressing surface 10 of the rocking boat-shaped rocker arm 6 is always in full contact with the receiving surface 5 of the pivotal support 3. As a result, the lubricating oil cannot smoothly penetrate into the rocking sliding portion 13 between the boat-shaped rocker arm 6 and the pivot support 3, and lubrication performance may be insufficient.
【０００６】また、当該舟形ロッカアーム６の押し当て
面１０の全面接当により、開弁駆動の開始時の打撃荷重
が舟形ロッカアーム６とプッシュロッド１１との伝動接
当部、及び吸排気弁１２との伝動接当部にそのまま伝達
されて当該伝達接当部での面圧が高くなるうえ、舟形ロ
ッカアーム６の上記揺動用摺擦部１３の摺動距離が長く
なるので、枢支装置が損耗する虞れが少なくない。本発
明は、舟形ロッカアームの枢支装置の潤滑性能や耐摩耗
性を向上することを技術的課題とする。Further, due to the entire contact of the pressing surface 10 of the boat-shaped rocker arm 6, the impact load at the start of the valve opening drive is reduced by the transmission contact portion between the boat-shaped rocker arm 6 and the push rod 11, and the suction / exhaust valve 12. Is transmitted as it is to the transmission contact portion, the surface pressure at the transmission contact portion is increased, and the sliding distance of the rocking sliding portion 13 of the boat-shaped rocker arm 6 is increased, so that the pivot device is worn. There is not much fear. It is a technical object of the present invention to improve lubrication performance and wear resistance of a pivot device of a boat-shaped rocker arm.
【０００７】[0007]
【課題を解決するための手段】上記課題を達成するため
の手段を、実施例を示す図１〜図４により以下に説明す
る。即ち、本発明１は前記基本構造の頭上弁エンジンの
動弁装置の舟形ロッカアームの枢支装置において、上記
枢支具３を中空状で弾性変形可能に形成し、枢支具３の
受け面５と舟形ロッカアーム６の押し当て面１０との間
の揺動用摺擦部１３は、閉弁時には横方向の周縁部１３
ａに隙間が生じ、開弁時には枢支具３の弾性変形で全面
接当して当該隙間が消滅するように構成したことを特徴
とするものである。Means for achieving the above object will be described below with reference to FIGS. 1 to 4 showing an embodiment. That is, the present invention 1 is a pivoting device for a boat-shaped rocker arm of a valve gear of an overhead valve engine having the basic structure, wherein the pivoting support 3 is formed to be hollow and elastically deformable, and a receiving surface 5 of the pivoting support 3 is provided. When the valve is closed, the swinging rubbing portion 13 between the boat and the pressing surface 10 of the boat-shaped rocker arm 6 has a lateral peripheral portion 13.
a, a gap is formed, and when the valve is opened, the entire surface is brought into contact with the elastic deformation of the pivotal support 3 so that the gap disappears.
【０００８】本発明２は、上記本発明１において、前記
枢支具３の上部の押し面１４を凸曲面に形成し、受け止
め具４の下面の受け止め面２１を凹曲面に形成し、この
凹曲状受け止め面２１に凸曲状押し面１４を揺動摺動自
在に接当させて受け止め部１５を構成し、舟形ロッカア
ーム６の揺動に伴い、舟形ロッカアーム６に対して枢支
具３がすべりながら連れ回されて、枢支具３が受け止め
具４に対して揺動摺動するように構成したことを特徴と
するものである。According to a second aspect of the present invention, in the first aspect, the upper pressing surface 14 of the pivotal support 3 is formed as a convex curved surface, and the receiving surface 21 on the lower surface of the receiving fixture 4 is formed as a concave curved surface. The receiving portion 15 is configured by swingably slidingly contacting the convex pressing surface 14 with the curved receiving surface 21, and the pivoting support 3 is attached to the boat-shaped rocker arm 6 with the swinging of the boat-shaped rocker arm 6. The pivotal support member 3 is configured to be swiveled and slid with respect to the receiving member 4 while being swung and slipped.
【０００９】[0009]
（1）舟形ロッカアーム６の揺動用摺擦部１３では、閉
弁時にはその周縁部１３ａに隙間Ｂが生じている（図２
の実線参照）。しかしながら、本発明１では、枢支具３
を中空状で弾性変形可能に形成するので、開弁駆動時に
は、プッシュロッド１１と吸排気弁１２の閉弁バネ２２
で舟形ロッカアーム６が上向きの荷重を受けるため、上
側を受け止めナット４で固定された中空状の枢支具３は
舟形ロッカアーム６で押されて弾性変形し、揺動用摺擦
部１３の周縁部１３ａは全面接当して当該隙間Ｂは消滅
する（図２の仮想線Ａ参照）。このため、舟形ロッカア
ーム６の揺動による枢支具３の弾性変形に伴い、当該揺
動用摺擦部１３にポンピング作用が生じ、ロッカアーム
室１内の潤滑油がこの摺擦部１３の奥までスムーズに導
入される。(1) In the rocking sliding portion 13 of the boat-shaped rocker arm 6, when the valve is closed, a gap B is formed in the peripheral portion 13a (FIG. 2).
Solid line). However, in the present invention 1, the pivotal support 3
Is formed to be hollow and elastically deformable, so that when the valve is driven to open, the valve closing spring 22 of the push rod 11 and the intake / exhaust valve 12 is opened.
Since the boat-shaped rocker arm 6 receives an upward load, the hollow pivotal support 3 fixed by the receiving nut 4 is pushed by the boat-shaped rocker arm 6 and elastically deforms, and the peripheral edge 13a of the rubbing portion 13 for swinging. And the gap B disappears (see the imaginary line A in FIG. 2). For this reason, with the elastic deformation of the pivot support 3 due to the swing of the boat-shaped rocker arm 6, a pumping action is generated in the swing rubbing portion 13, and the lubricating oil in the rocker arm chamber 1 is smoothly moved to the inside of the rubbing portion 13. Will be introduced.
【００１０】また、開弁駆動の開始時の打撃荷重を枢支
具３の弾性変形で吸収できるので、舟形ロッカアーム６
とプッシュロッド１１との伝動接当部、及び吸排気弁１
２との伝動接当部の面圧が低くなる。Further, since the striking load at the start of the valve opening drive can be absorbed by the elastic deformation of the pivotal support 3, the boat-shaped rocker arm 6 can be absorbed.
Transmission contact portion between the piston and the push rod 11, and the intake / exhaust valve 1
The surface pressure of the transmission contact portion with the second member is reduced.
【００１１】（2）本発明２では、舟形ロッカアーム６
の揺動に伴い、舟形ロッカアーム６に対して枢支具３が
すべりながら連れ回されて、枢支具３が受け止め具４に
対して摺動するので、枢支具３の受け面５と舟形ロッカ
アーム６の押し当て面１０との間の揺動用摺擦部１３
は、摺動距離が短くなって、摩耗が減少し、耐久性が向
上する。(2) In the present invention 2, the boat-shaped rocker arm 6
With the swing of the pivoting rocker arm 6, the pivoting support 3 slides and rotates with respect to the boat-shaped rocker arm 6, and the pivoting support 3 slides with respect to the receiving fixture 4. Oscillating sliding portion 13 between pressing surface 10 of rocker arm 6
, The sliding distance is shortened, wear is reduced, and durability is improved.
【００１２】[0012]
（1）本発明１では、枢支具の弾性変形に伴う舟形ロッ
カアームの揺動用摺擦部のポンピング作用で潤滑油をこ
の摺擦部の奥までスムーズに導入できるので、当該揺動
用摺擦部の潤滑性能を向上できる。また、枢支具の弾性
変形で、開弁駆動の開始時の打撃荷重を当該弾性変形で
吸収できるので、舟形ロッカアームとプッシュロッドと
の伝動接当部、及び開閉弁との伝動接当部の面圧が低く
なる。このため、当該伝動接当部の損耗が低減して、舟
形ロッカアームの枢支装置の耐摩耗性を高められる。(1) In the first aspect of the present invention, the lubricating oil can be smoothly introduced into the rubbing portion by the pumping action of the oscillating rubbing portion of the boat-shaped rocker arm due to the elastic deformation of the pivot support. Lubrication performance can be improved. In addition, since the striking load at the start of the valve-opening drive can be absorbed by the elastic deformation of the pivoting support, the transmission contact portion between the boat-shaped rocker arm and the push rod and the transmission contact portion between the on-off valve and the on-off valve can be absorbed. Surface pressure decreases. For this reason, the wear of the transmission contact portion is reduced, and the wear resistance of the pivot device of the boat-shaped rocker arm can be increased.
【００１３】（2）本発明２では、舟形ロッカアームの
揺動に伴い、舟形ロッカアームに対して枢支具がすべり
ながら連れ回されて、枢支具が受け止め具に対して摺動
するので、枢支具の受け面と舟形ロッカアームの押し当
て面との間の揺動用摺擦部は、摺動距離が短くなって、
摩耗が減少し、耐久性が向上する。(2) According to the second aspect of the present invention, the pivotal support slides with respect to the boat-shaped rocker arm with the swing of the boat-shaped rocker arm, and the pivotable support slides with respect to the receiving fixture. The sliding rubbing part between the receiving surface of the support and the pressing surface of the boat-shaped rocker arm has a reduced sliding distance,
Wear is reduced and durability is improved.
【００１４】[0014]
【実施例】以下、本発明の実施例を図面に基づいて述べ
る。図１は実施例１を示す縦型頭上弁エンジンの動弁装
置の舟形ロッカアームの枢支装置の要部の縦断正面図、
図２は同枢支装置の枢支具と舟形ロッカアームとの間の
変形原理図、図３は枢支具と受け止め具との間の変形原
理図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical front view of a main part of a pivoting device of a boat-shaped rocker arm of a valve train of a vertical overhead valve engine according to a first embodiment;
FIG. 2 is a diagram illustrating the principle of deformation between the pivoting device and the boat-shaped rocker arm of the pivot device, and FIG. 3 is a diagram illustrating the principle of deformation between the pivoting device and the receiving device.
【００１５】図１に示すように、縦型頭上弁エンジンＥ
のロッカアーム室１に支柱ボルト２をシリンダヘッド１
７から離れる上向きに立設し、支柱ボルト２に枢支具３
を縦向きに嵌挿し、その上から受け止め鍔４ａを介して
受け止めナット４を同支柱ボルト２にネジ嵌合し、当該
枢支具３を受け止めナット４及び受け止め鍔４ａで上側
から受け止め可能に支持する。また、板金を舟形に加工
した舟形ロッカアーム６をこの枢支具３に下側から接当
させ、ロッカアーム６の右端入力部７にプッシュロッド
１１の出力部１１ａを押圧可能に接当し、その左端出力
部８を吸排気弁１２の入力部１２ａに押圧可能に接当し
て、舟形ロッカアーム６を支柱２を介して左右方向に揺
動自在に支持する。As shown in FIG. 1, a vertical overhead valve engine E
Column bolt 2 into the rocker arm chamber 1 of the cylinder head 1
7 and stand upright away from the support bolt 7 and
Is vertically inserted, and a receiving nut 4 is screwed into the column bolt 2 via a receiving flange 4a from above, and the pivoting support 3 is supported by the receiving nut 4 and the receiving flange 4a so as to be received from above. I do. Further, a boat-shaped rocker arm 6 made by processing a sheet metal into a boat shape is brought into contact with the pivot support 3 from below, and the right end input portion 7 of the rocker arm 6 is brought into contact with the output portion 11a of the push rod 11 so as to be able to press. The output section 8 is pressed against the input section 12 a of the intake / exhaust valve 12 to support the boat-shaped rocker arm 6 via the column 2 so as to be swingable in the left-right direction.
【００１６】即ち、図１に示すように、上記舟形ロッカ
アーム６の中央部に部分球面状の押し当て面１０を凹設
し、この押し当て面１０に臨ませて開口部１８を開け
る。また、半球面状のカップ部材を二つ合わせて中空状
で弾性変形可能な全球面状の枢支具３を形成し、当該枢
支具３の下寄り部を部分球面状の受け面５に、その上寄
り部を同じく部分球面状の押し面１４に夫々構成する。
前記支柱ボルト２に舟形ロッカアーム６を開口部１８を
通して遊嵌し、舟形ロッカアーム６の押し当て面１０を
枢支具３の受け面５に下側から面接触可能に接当し、枢
支具３の押し面１４を前記受け止め鍔４ａの下面の凹曲
状受け止め面２１に下側から揺動摺動自在に接当する。That is, as shown in FIG. 1, a partially spherical pressing surface 10 is recessed at the center of the boat-shaped rocker arm 6, and an opening 18 is opened facing this pressing surface 10. In addition, two hemispherical cup members are combined to form a hollow, elastically deformable, and fully spherical pivotal support 3, and the lower portion of the pivotal support 3 is formed on a partially spherical receiving surface 5. , And the upper part thereof is similarly formed on the partially spherical pressing surface 14.
The boat-shaped rocker arm 6 is loosely fitted to the column bolt 2 through the opening 18, and the pressing surface 10 of the boat-shaped rocker arm 6 is brought into contact with the receiving surface 5 of the pivot support 3 from below so as to be in surface contact therewith. Of the receiving flange 4a is swingably slidably contacted from below with the concavely curved receiving surface 21 of the receiving flange 4a.
【００１７】上記枢支具３は中空状で弾性変形可能なの
で、枢支具３の受け面５と舟形ロッカアーム６の押し当
て面１０との間の揺動用摺擦部１３は、閉弁時には左右
方向の周縁部１３ａに隙間が生じ、開弁時には枢支具３
の弾性変形で全面接当して当該隙間が消滅するように構
成される。また、枢支具３と受け止め具４（具体的に
は、受け止め鍔４ａ）との間の受け止め部１５は、閉弁
時には横方向の周縁部１５ａに隙間が生じ、開弁時には
枢支具３の弾性変形で当該隙間が狭くなるように構成さ
れる。そして、舟形ロッカアーム６の揺動に伴い、舟形
ロッカアーム６に対して、枢支具３がすべりながら連れ
回されて、枢支具３が受け止め具４に対して揺動摺動す
るように構成したものである。尚、符号１６は受け止め
ナット４の緩み防止用のロックナットである。Since the pivotal support 3 is hollow and elastically deformable, the swinging rubbing portion 13 between the receiving surface 5 of the pivotal support 3 and the pressing surface 10 of the boat-shaped rocker arm 6 is left and right when the valve is closed. A gap is generated in the peripheral portion 13a in the direction, and when the valve is opened, the pivot support 3
The gap is erased by the entire surface contacting due to the elastic deformation of. Further, the receiving portion 15 between the pivotal support 3 and the receiving tool 4 (specifically, the receiving flange 4a) has a gap in a lateral peripheral portion 15a when the valve is closed, and the pivotal support 3 when the valve is opened. The gap is narrowed by the elastic deformation of. Then, with the rocking of the boat-shaped rocker arm 6, the pivotal support 3 is swiveled with respect to the boat-shaped rocker arm 6, and the pivotal support 3 swings and slides with respect to the receiving tool 4. Things. Reference numeral 16 denotes a lock nut for preventing the receiving nut 4 from loosening.
【００１８】そこで、本実施例１の舟形ロッカアームの
枢支装置の機能を説明する。図２の実線で示すように、
閉弁時の舟形ロッカアーム６の揺動用摺擦部１３ではそ
の周縁部１３ａに隙間Ｂが生じているが、開弁駆動時に
は、プッシュロッド１１と開閉弁１２で舟形ロッカアー
ム６が上向きの荷重を受けるため、図２の仮想線Ａで示
すように、上側を受け止めナット４で固定された中空状
の枢支具３は舟形ロッカアーム６で押されて略楕円形状
に弾性変形する。従って、揺動用摺擦部１３の周縁部１
３ａは全面接当して当該隙間Ｂは消滅する。このため、
舟形ロッカアーム６の揺動による枢支具３の弾性変形に
伴い、当該揺動用摺擦部１３にポンピング作用が生じ、
ロッカアーム室１内の潤滑油がこの摺擦部１３の奥まで
スムーズに導入され、当該揺動用摺擦部１３の潤滑性能
が向上する。The function of the pivot device of the boat-shaped rocker arm according to the first embodiment will now be described. As shown by the solid line in FIG.
A gap B is formed at the peripheral edge portion 13a of the rocking sliding portion 13 of the boat-shaped rocker arm 6 when the valve is closed. Therefore, as shown by the imaginary line A in FIG. 2, the hollow pivotal support 3 fixed on the upper side by the receiving nut 4 is pushed by the boat-shaped rocker arm 6 and elastically deforms into a substantially elliptical shape. Therefore, the peripheral portion 1 of the rubbing portion 13 for swinging
3a comes into contact with the entire surface, and the gap B disappears. For this reason,
With the elastic deformation of the pivot support 3 due to the swing of the boat-shaped rocker arm 6, a pumping action is generated in the swing rubbing portion 13,
The lubricating oil in the rocker arm chamber 1 is smoothly introduced into the rubbing portion 13, and the lubricating performance of the swinging rubbing portion 13 is improved.
【００１９】また、図２に示すように、開弁駆動の開始
時の打撃荷重を枢支具３の弾性変形で吸収できるので、
舟形ロッカアーム６とプッシュロッド１１との伝動接当
部、及び開閉弁１２との伝動接当部の面圧が低くなる。
この結果、当該伝動接当部の損耗が低減し、舟形ロッカ
アームの枢支装置の耐摩耗性が向上する。Further, as shown in FIG. 2, the impact load at the start of the valve opening drive can be absorbed by the elastic deformation of the pivot support 3,
The surface pressure of the transmission contact portion between the boat-shaped rocker arm 6 and the push rod 11 and the transmission contact portion of the boat-shaped rocker arm 6 and the on-off valve 12 is reduced.
As a result, wear of the transmission contact portion is reduced, and the wear resistance of the pivot device of the boat-shaped rocker arm is improved.
【００２０】しかも、図３に示すように、枢支具３と受
け止め鍔４（具体的には、受け止め鍔４ａ）との間の受
け止め部１５においても、中空状の枢支具３の開弁駆動
時の弾性変形（仮想線Ｃ参照）でポンピング作用が生じ
るので、当該受け止め部１５の奥まで潤滑油を円滑に導
入できる。また、枢支具３の弾性変形で開弁駆動の開始
時の打撃荷重を吸収するので、当該受け止め部１５の損
耗を低減し、当該枢支装置の耐摩耗性がより高まる。さ
らに、舟形ロッカアーム６の揺動に伴い、舟形ロッカア
ーム６に対して枢支具３がすべりながら連れ回されて、
枢支具３が受け止め具４に対して摺動するので、枢支具
３の受け面５と舟形ロッカアーム６の押し当て面１０と
の間の揺動用摺擦部１３は、摺動距離が短くなって、摩
耗が減少し、耐久性が向上する。Further, as shown in FIG. 3, at the receiving portion 15 between the pivotal support 3 and the receiving flange 4 (specifically, the receiving flange 4a), the valve opening of the hollow pivotal support 3 is performed. Since the pumping action is generated by the elastic deformation at the time of driving (see the imaginary line C), the lubricating oil can be smoothly introduced into the receiving portion 15. Further, since the striking load at the start of the valve opening drive is absorbed by the elastic deformation of the pivot support 3, the wear of the receiving portion 15 is reduced, and the wear resistance of the pivot support device is further improved. Further, with the rocking of the boat-shaped rocker arm 6, the pivotal support 3 is swept with the boat-shaped rocker arm 6 while sliding,
Since the pivotal support 3 slides with respect to the receiving tool 4, the sliding rubbing portion 13 between the receiving surface 5 of the pivotal support 3 and the pressing surface 10 of the boat-shaped rocker arm 6 has a short sliding distance. As a result, wear is reduced and durability is improved.
【００２１】他方、図４は本発明の実施例２を示し、中
空状の枢支具３を実施例１のような全球面状に形成する
替わりに、受け面５の周辺の下半部だけを半球面状に形
成し、枢支具３の上端を切欠状の平坦な開口部１９に形
成したもので、当該上端開口部１９を受け止め鍔４ａに
広い面積で接当して当該枢支具３を支柱ボルト２に確実
に位置決め固定できる。On the other hand, FIG. 4 shows a second embodiment of the present invention. Instead of forming the hollow pivotal support 3 into a full spherical shape as in the first embodiment, only the lower half of the periphery of the receiving surface 5 is provided. Is formed in a hemispherical shape, and the upper end of the pivotal support 3 is formed in a flat opening 19 having a cutout shape. 3 can be reliably positioned and fixed to the column bolt 2.
【図１】実施例１を示す縦型頭上弁エンジンの動弁装置
の舟形ロッカアームの枢支装置の要部の縦断正面図であ
る。FIG. 1 is a longitudinal sectional front view of a main part of a pivoting device of a boat-shaped rocker arm of a valve train of a vertical overhead valve engine according to a first embodiment.
【図２】同枢支装置の枢支具と舟形ロッカアームとの間
の変形原理図である。FIG. 2 is a diagram showing the principle of deformation between a pivoting device of the pivoting device and a boat-shaped rocker arm.
【図３】枢支具と受け止め具との間の変形原理図であ
る。FIG. 3 is a diagram of a deformation principle between a pivot support and a receiving tool.
【図４】実施例２を示す図１の相当図である。FIG. 4 is a diagram corresponding to FIG. 1 showing a second embodiment.
【図５】従来技術を示す縦型頭上弁エンジンのロッカア
ーム室周辺の縦断正面図である。FIG. 5 is a vertical sectional front view of the vicinity of a rocker arm chamber of a vertical overhead valve engine showing the prior art.
１…ロッカアーム室、２…支柱、３…枢支具、４…受け
止め具、５…枢支具の受け面、６…舟形ロッカアーム、
７…舟形ロッカアームの入力部、８…舟形ロッカアーム
の出力部、１０…舟形ロッカアームの押し当て面、１１
…プッシュロッド、１１ａ…プッシュロッドの出力部、
１２…吸排気弁、１２ａ…吸排気弁の入力部、１３…受
け面と押し当て面の間の揺動用摺擦部、１３ａ…揺動用
摺擦部の周縁部、１４…枢支具の押し面、１５…枢支具
と受け止め具の間の受け止め部、１７…シリンダヘッ
ド、２１…受け止め具の受け止め面、Ｅ…頭上弁エンジ
ン。DESCRIPTION OF SYMBOLS 1 ... Rocker arm room, 2 ... Prop, 3 ... Pivot, 4 ... Receiving tool, 5 ... Receiving surface of pivot support, 6 ... Boat-shaped rocker arm,
7: input part of boat-shaped rocker arm, 8: output part of boat-shaped rocker arm, 10: pressing surface of boat-shaped rocker arm, 11
... Push rod, 11a ... Output part of push rod,
12: intake / exhaust valve, 12a: input portion of intake / exhaust valve, 13: swinging rubbing portion between receiving surface and pressing surface, 13a: peripheral edge of swinging rubbing portion, 14: pushing of pivot support Surface, 15: receiving portion between pivot support and receiving device, 17: cylinder head, 21: receiving surface of receiving device, E: overhead valve engine.
Claims (2)
（１）内で、支柱（２）をシリンダヘッド（１７）から
上向きに立設し、支柱（２）に外嵌させた枢支具（３）
を受け止め具（４）で上側から受け止め、枢支具（３）
の下面に凸曲面状の受け面（５）を設け、 舟形ロッカアーム（６）の一端の入力部（７）にプッシ
ュロッド（１１）の出力部（１１ａ）を押圧可能に接当
し、その他端の出力部（８）を吸排気弁（１２）の入力
部（１２ａ）に押圧可能に接当し、その中央部に曲面状
の押し当て面（１０）を凹設し、 この舟形ロッカアーム（６）の押し当て面（１０）を枢
支具（３）の受け面（５）に下側から揺動自在に接当さ
せて構成した頭上弁エンジンの動弁装置の舟形ロッカア
ームの枢支装置において、 上記枢支具（３）を中空状で弾性変形可能に形成し、 枢支具（３）の受け面（５）と舟形ロッカアーム（６）
の押し当て面（１０）との間の揺動用摺擦部（１３）
は、閉弁時には横方向の周縁部（１３ａ）に隙間が生
じ、開弁時には枢支具（３）の弾性変形で全面接当して
当該隙間が消滅するように構成したことを特徴とする頭
上弁エンジンの動弁装置の舟形ロッカアームの枢支装
置。1. A support (2) having a support (2) standing upright from a cylinder head (17) in a rocker arm chamber (1) of an overhead valve engine (E) and externally fitted to the support (2). 3)
Receive from the upper side with the catch (4) and the pivot support (3)
A convex receiving surface (5) is provided on the lower surface of the push rod (11), and the output portion (11a) of the push rod (11) is pressed against the input portion (7) at one end of the boat-shaped rocker arm (6). Of the boat-shaped rocker arm (6), the output portion (8) of the boat-shaped rocker arm (6) being pressed against the input portion (12a) of the intake / exhaust valve (12) so as to be pressed. ) Of the boat-shaped rocker arm of the valve gear of the overhead valve engine, in which the pressing surface (10) is pivotally abutted from below on the receiving surface (5) of the pivot support (3). The pivotal support (3) is formed to be hollow and elastically deformable, and the receiving surface (5) of the pivotal support (3) and the boat-shaped rocker arm (6).
Oscillating rubbing part (13) between pressing surface (10)
Is characterized in that when the valve is closed, a gap is formed in the lateral peripheral portion (13a), and when the valve is opened, the entire surface is brought into contact by the elastic deformation of the pivotal support (3) and the gap disappears. A pivot device for the boat-shaped rocker arm of the valve train for overhead valve engines.
４）を凸曲面に形成し、受け止め具（４）の下面の受け
止め面（２１）を凹曲面に形成し、この凹曲状受け止め
面（２１）に凸曲状押し面（１４）を揺動摺動自在に接
当させて受け止め部（１５）を構成し、 舟形ロッカアーム（６）の揺動に伴い、舟形ロッカアー
ム（６）に対して枢支具（３）がすべりながら連れ回さ
れて、枢支具（３）が受け止め具（４）に対して揺動摺
動するように構成したことを特徴とする請求項１に記載
の頭上弁エンジンの動弁装置の舟形ロッカアームの枢支
装置。2. The push surface (1) on the upper part of said pivoting device (3).
4) is formed as a convex curved surface, the receiving surface (21) on the lower surface of the receiving member (4) is formed as a concave curved surface, and the convex curved pressing surface (14) is oscillated on the concave curved receiving surface (21). The receiving portion (15) is slidably contacted to form the receiving portion (15). With the swinging of the boat-shaped rocker arm (6), the pivoting support (3) slides with respect to the boat-shaped rocker arm (6), and is taken along. 2. A pivoting device for a boat-shaped rocker arm of a valve operating device for an overhead valve engine according to claim 1, wherein the pivoting device (3) is configured to swing and slide with respect to the receiving device (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18767393A JP2838471B2 (en) | 1993-06-29 | 1993-06-29 | Pivot device for boat-shaped rocker arm of valve train of overhead valve engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18767393A JP2838471B2 (en) | 1993-06-29 | 1993-06-29 | Pivot device for boat-shaped rocker arm of valve train of overhead valve engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0719010A JPH0719010A (en) | 1995-01-20 |
| JP2838471B2 true JP2838471B2 (en) | 1998-12-16 |
Family
ID=16210152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18767393A Expired - Lifetime JP2838471B2 (en) | 1993-06-29 | 1993-06-29 | Pivot device for boat-shaped rocker arm of valve train of overhead valve engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2838471B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2620590A (en) * | 2022-07-12 | 2024-01-17 | Caterpillar Energy Solutions Gmbh | Rocker arm for a piston engine valve, valve assembly, and piston engine |
-
1993
- 1993-06-29 JP JP18767393A patent/JP2838471B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0719010A (en) | 1995-01-20 |
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