JP3535430B2 - Valve train for internal combustion engine - Google Patents
Valve train for internal combustion engineInfo
- Publication number
- JP3535430B2 JP3535430B2 JP37083699A JP37083699A JP3535430B2 JP 3535430 B2 JP3535430 B2 JP 3535430B2 JP 37083699 A JP37083699 A JP 37083699A JP 37083699 A JP37083699 A JP 37083699A JP 3535430 B2 JP3535430 B2 JP 3535430B2
- Authority
- JP
- Japan
- Prior art keywords
- rocker arm
- rocker shaft
- shaft
- support portion
- side rocker
- 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 - Fee Related
Links
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ロッカアームの基
端に設けられる揺動支持部がシリンダヘッドに設けられ
たロッカシャフトで揺動可能に支承され、複数の機関弁
の上端に個別に当接可能とした複数の弁当接部がロッカ
アームの先端に設けられ、動弁カムに接触するカム当接
部が前記揺動支持部および前記各弁当接部間の中間部で
ロッカアームに設けられる内燃機関の動弁装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rocker arm provided at the base end of a rocker arm, which is rockably supported by a rocker shaft provided on a cylinder head, and individually abuts on the upper ends of a plurality of engine valves. A plurality of possible valve contact portions are provided at the tip of the rocker arm, and a cam contact portion that contacts the valve operating cam is provided in the rocker arm at an intermediate portion between the swing support portion and each of the valve contact portions. The present invention relates to a valve train.
【０００２】[0002]
【従来の技術】従来、かかる動弁装置は、たとえば特開
平６−１８５３２２号公報等で既に知られている。2. Description of the Related Art Conventionally, such a valve operating device has been already known, for example, from Japanese Patent Laid-Open No. 6-185322.
【０００３】[0003]
【発明が解決しようとする課題】ところで、複数の機関
弁を単一のロッカアームで駆動するようにした動弁装置
では、運転時間の経過により、複数の機関弁と、それら
の機関弁に個別に対応してロッカアームが備える複数の
弁当接部との間のタペットクリアランスに差が生じるこ
とがあり、そのようなタペットクリアランスの差が生じ
ると、相互に並ぶ複数の弁当接部の列の一端側の弁当接
部およびカム当接部を結ぶ直線上で発生する大きな荷重
により、ロッカアームには該ロッカアームを傾ける力が
作用する。このためロッカシャフトの軸線方向に沿う揺
動支持部の両端部に大きな荷重が作用し、その荷重に耐
える剛性を揺動支持部に持たせないと、偏摩耗が生じて
耐久性が低下する可能性がある。しかるに上記従来の動
弁装置のロッカアームでは、揺動支持部がロッカシャフ
トの軸線方向に沿う全長にわたって均等の肉厚の円筒状
に形成されており、揺動支持部の剛性を高めるために揺
動支持部の肉厚を増大するとロッカアームの重量が増大
してしまう。By the way, in a valve operating system in which a plurality of engine valves are driven by a single rocker arm, a plurality of engine valves and the engine valves are individually separated by the passage of operating time. Correspondingly, there may be a difference in tappet clearance between the plurality of valve abutting portions of the rocker arm, and if such a difference in tappet clearance occurs, one end side of the row of the plurality of valve abutting portions aligned with each other may be formed. Due to the large load generated on the straight line connecting the valve contact portion and the cam contact portion, a force that tilts the rocker arm acts on the rocker arm. Therefore, a large load acts on both ends of the rocking support along the axial direction of the rocker shaft, and if the rocking support does not have rigidity to withstand the load, uneven wear may occur and durability may be reduced. There is a nature. However, in the rocker arm of the above-mentioned conventional valve operating device, the rocking support portion is formed in a cylindrical shape with a uniform thickness over the entire length along the axial direction of the rocker shaft, and the rocking support portion is rocked in order to increase the rigidity of the rocking support portion. Increasing the thickness of the supporting portion increases the weight of the rocker arm.
【０００４】本発明は、かかる事情に鑑みてなされたも
のであり、ロッカアームの重量増大を回避しつつ耐久性
を向上した内燃機関の動弁装置を提供することを目的と
する。The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a valve train for an internal combustion engine which has improved durability while avoiding an increase in weight of the rocker arm.
【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、請求項１記載の発明は、ロッカアームの基端に設け
られる円筒状の揺動支持部がシリンダヘッドに設けられ
たロッカシャフトで揺動可能に支承され、一対の機関弁
の上端に個別に当接可能とした第１および第２タペット
ねじがロッカアームの先端に設けられ、動弁カムに接触
するカム当接部が前記揺動支持部および前記各タペット
ねじ間の中間部でロッカアームに設けられる内燃機関の
動弁装置において、前記揺動支持部は、前記ロッカシャ
フトを囲繞する薄肉円筒部の軸方向両端に、前記ロッカ
シャフトを囲繞する円筒状にして前記薄肉円筒部よりも
肉厚の厚肉円筒部がそれぞれ一体に連設されて成り、そ
の両厚肉円筒部から第１および第２支持壁が、前記ロッ
カシャフトの軸線に直交する平面に沿うようにしてそれ
ぞれ延設されており、その第１および第２支持壁の先端
には、外周面を横断面円弧状とした第１および第２ボス
部がそれぞれ一体に形成されると共に、その第１および
第２ボス部には、前記第１および第２タペットねじを螺
合せしめるねじ孔がそれぞれ設けられ、前記揺動支持部
は、前記ロッカシャフトの軸線に沿う方向で前記第１お
よび第２タペットねじの中心間の距離よりも長く形成さ
れていることを特徴とする。 In order to achieve the above object, the invention according to claim 1 is such that a cylindrical rocking support portion provided at a base end of a rocker arm is rocked by a rocker shaft provided at a cylinder head. First and second tappets that are movably supported and can individually contact the upper ends of a pair of engine valves.
A screw is provided at the tip of the rocker arm, and a cam contact portion that comes into contact with the valve operating cam has the swing support portion and the tappets.
In a valve operating system for an internal combustion engine provided in the rocker arm in an intermediate portion between the screw, the pivot support portion, at both axial ends of the thin cylindrical portion surrounding said rocker shaft, and a cylindrical shape surrounding the rocker shaft the thick cylindrical portion of the wall thickness than the thin cylindrical portion Ri formed is integrally connected to each their
From both thick-walled cylindrical parts of the first and second support walls,
It along a plane perpendicular to the axis of the casket
Extending respectively, the tips of the first and second support walls
Includes first and second bosses whose outer peripheral surface has an arcuate cross section.
The parts are integrally formed, and the first and
Screw the first and second tappet screws into the second boss portion.
The rocking support portion is provided with screw holes for matching.
In the direction along the axis of the rocker shaft.
And is formed longer than the distance between the centers of the second tappet screw.
It shall be the feature of the being.
【０００６】また上記目的を達成するために、請求項２
記載の発明は、ロッカアームの基端に設けられる円筒状
の揺動支持部がシリンダヘッドに設けられたロッカシャ
フトで揺動可能に支承され、一対の機関弁の上端に個別
に当接可能とした第１および第２タペットねじがロッカ
アームの先端に設けられ、動弁カムに接触するカム当接
部が前記揺動支持部および前記各タペットねじ間の中間
部でロッカアームに設けられる内燃機関の動弁装置にお
いて、前記揺動支持部は、前記ロッカシャフトを囲繞す
る薄肉円筒部の軸方向両端に、前記ロッカシャフトを囲
繞する円筒状にして前記薄肉円筒部よりも肉厚の厚肉円
筒部がそれぞれ一体に連設されて成ると共に、その両厚
肉円筒部の内面に、ロッカシャフトの外面との間にオイ
ルを溜め得る溝がそれぞれ設けられ、その両厚肉円筒部
から第１および第２支持壁が、前記ロッカシャフトの軸
線に直交する平面に沿うようにしてそれぞれ延設されて
おり、その第１および第２支持壁の先端には、外周面を
横断面円弧状とした第１および第２ボス部がそれぞれ一
体に形成されると共に、その第１および第２ボス部に
は、前記第１および第２タペットねじを螺合せしめるね
じ孔がそれぞれ設けられ、前記揺動支持部は、前記ロッ
カシャフトの軸線に沿う方向で前記第１および第２タペ
ットねじの中心間の距離よりも長く形成されていること
を特徴とする。Further, in order to achieve the above-mentioned object, claim 2
The invention described is pivot support portion groups cylindrical provided on end of Russia Kkaamu is swingably supported by the rocker shaft provided in the cylinder head, can abut individually on the upper end of the pair of engine valves The first and second tappet screws are provided at the tip of the rocker arm, and the cam abutting portion that comes into contact with the valve operating cam is provided in the rocker arm at an intermediate portion between the swing support portion and the tappet screws. In the valve device, the rocking support portion has , at both axial ends of the thin-walled cylindrical portion surrounding the rocker shaft, a thick-walled cylindrical portion thicker than the thin-walled cylindrical portion in a cylindrical shape surrounding the rocker shaft. formed is integrally connected to each Rutotomoni, the inner surface of the both thick cylindrical portion, a groove may sump oil between the outer surface of the rocker shaft are provided, respectively, at both the thick cylindrical portion
From the first and second support walls to the axis of the rocker shaft
Each is extended along a plane orthogonal to the line
And the outer peripheral surfaces at the tips of the first and second support walls.
The first and second boss portions each having an arcuate cross section have one
Formed on the body and at the first and second bosses
Fits the first and second tappet screws together.
And the rocking support portion is provided with
The first and second tapes are arranged in a direction along the axis of the casshaft.
It is characterized in that it is formed longer than the distance between the centers of the stud screws .
【０００７】上記請求項１，２の各特徴によれば、揺動
支持部の中央側を薄肉としてロッカアームの重量増大を
回避しつつ、大きな荷重が作用する可能性がある揺動支
持部の両端部を肉厚としてロッカアームの支持剛性を高
めることができ、耐久性の向上を図ることができる。更
に第１および第２タペットねじ間の距離以上の長さで揺
動支持部がロッカシャフトに支持されることになって、
ロッカアームをより安定的に支持することが可能とな
る。 According to the features of claims 1 and 2 , both ends of the rocking support portion where a large load may act while avoiding an increase in weight of the rocker arm by making the center side of the rocking support portion thin. By making the portion thicker, it is possible to enhance the support rigidity of the rocker arm and improve the durability. Change
Oscillate for a length greater than the distance between the first and second tappet screws.
The dynamic support will be supported by the rocker shaft,
It is possible to support the rocker arm more stably.
It
【０００８】また特に請求項２の特徴によれば、揺動支
持部の両端部およびロッカシャフト間にオイルを溜める
ことが可能であるので偏摩耗が生じるのを極力防止する
ことができ、しかも厚肉円筒部の内面に溝が設けられる
ので溝による揺動支持部の剛性低下を避けることがで
き、耐久性を確実に向上することができる。 According to the second aspect of the invention, oil can be stored between both ends of the rocking support portion and the rocker shaft, so that uneven wear can be prevented as much as possible and the thickness can be increased. Since the groove is provided on the inner surface of the meat cylinder portion, it is possible to prevent the rigidity of the rocking support portion from being lowered by the groove, and it is possible to reliably improve the durability.
【０００９】また請求項３の発明は、請求項１又は２の
前記特徴に加えて、前記各ボス部間が、前記ロッカシャ
フトの軸線に直交する平面内で相互に直交する第１およ
び第２壁部を有する連結壁で連結されることを特徴と
し、この特徴によれば、一対の機関弁を駆動するロッカ
アームの先端側の剛性を上記連結壁により充分に高める
ことができ、しかもその連結壁は、ロッカシャフトの軸
線即ちロッカアームの揺動軸線と直交する平面内で相互
に直交する第１および第２壁部から成るものであるの
で、充分な連結剛性を保持しつつ連結壁による排気側ロ
ッカアームの重量増大を小さく抑えることができる。 The invention of claim 3 is the same as that of claim 1 or 2.
In addition to the above characteristics, the rocker chassis is provided between the bosses.
In the plane orthogonal to the axis of the shaft
And a connection wall having a second wall portion.
However, according to this feature, a rocker that drives a pair of engine valves
Rigidity on the tip side of the arm is sufficiently enhanced by the connecting wall.
And the connecting wall is the axis of the rocker shaft.
Line, that is, in the plane orthogonal to the rocking axis of the rocker arm,
Of first and second walls that are orthogonal to
, While maintaining sufficient connection rigidity, the exhaust wall is connected by the connecting wall.
It is possible to suppress an increase in the weight of the kicker arm.
【００１０】また請求項４の発明は、請求項３の前記特
徴に加えて、前記連結壁が、外面を前記各ボス部の先端
外周面に面一に連ならせる壁部を有することを特徴と
し、この特徴によれば、各ボス部および連結壁の連結部
への応力集中をなくし、ロッカアームの先端側剛性を充
分に高めつつ耐久性を向上することができる。 Further, the invention of claim 4 is the special feature of claim 3.
In addition to the above, the connecting wall has an outer surface that is the tip of each boss.
It is characterized in that it has a wall portion that is flush with the outer peripheral surface.
However, according to this feature, each boss and the connecting portion of the connecting wall
Stress concentration on the rocker arm tip side
It is possible to improve the durability while increasing it.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施の形態を、添
付の図面に示した本発明の一実施例に基づいて説明す
る。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on an embodiment of the present invention shown in the accompanying drawings.
【００１２】図１〜図７は本発明の一実施例を示すもの
であり、図１は内燃機関の一部縦断面図、図２は図１の
２矢視平面図、図３は排気側ロッカアームの平面図、図
４は図２の４−４線断面図、図５は図２の５−５線断面
図、図６は図５の６−６線断面図、図７は図６の７ー７
線断面図である。1 to 7 show an embodiment of the present invention. FIG. 1 is a partial longitudinal sectional view of an internal combustion engine, FIG. 2 is a plan view taken along the arrow 2 in FIG. 1, and FIG. A plan view of the rocker arm, FIG. 4 is a sectional view taken along line 4-4 of FIG. 2, FIG. 5 is a sectional view taken along line 5-5 of FIG. 2, FIG. 6 is a sectional view taken along line 6-6 of FIG. 5, and FIG. 7-7
It is a line sectional view.
【００１３】先ず図１および図２において、この多気筒
内燃機関は、シリンダブロック１５と、該シリンダブロ
ック１５の上部にガスケット１７を介して結合されるシ
リンダヘッド１６とを備え、各気筒毎にシリンダブロッ
ク１５に設けられるシリンダ１８にピストン１９がそれ
ぞれ摺動可能に嵌合される。またシリンダブロック１
５、シリンダヘッド１６および各ピストン１９により、
各気筒毎に燃焼室２０が形成される。First, in FIGS. 1 and 2, this multi-cylinder internal combustion engine is provided with a cylinder block 15 and a cylinder head 16 which is connected to an upper portion of the cylinder block 15 through a gasket 17, and a cylinder is provided for each cylinder. The pistons 19 are slidably fitted in the cylinders 18 provided in the block 15. Cylinder block 1
5, by the cylinder head 16 and each piston 19,
A combustion chamber 20 is formed for each cylinder.
【００１４】シリンダヘッド１６には、燃焼室２０の天
井面一側に臨む一対の吸気弁口２１…と、両吸気弁口２
１…に共通に連なってシリンダヘッド１６の一側面（図
１の右側面）に開口する吸気ポート２２とが各気筒毎に
設けられるとともに、燃焼室２０の天井面他側に臨む一
対の排気弁口２３…と、両排気弁口２３…に共通に連な
ってシリンダヘッド１６の他側面（図１の左側面）に開
口する排気ポート２４とが各気筒毎に設けられる。The cylinder head 16 has a pair of intake valve openings 21 ... Which face one side of the ceiling surface of the combustion chamber 20, and both intake valve openings 2.
1, an intake port 22 that is open in one side surface (right side surface in FIG. 1) of the cylinder head 16 and is provided for each cylinder, and a pair of exhaust valves that faces the other side of the ceiling surface of the combustion chamber 20. .. and an exhaust port 24 which is connected to both exhaust valve openings 23 ... and opens to the other side surface (left side surface in FIG. 1) of the cylinder head 16 is provided for each cylinder.
【００１５】各吸気弁口２１…をそれぞれ開閉可能な吸
気弁ＶＩ，ＶＩのステム２５…はシリンダヘッド１６に
設けられたガイド筒２６…に摺動可能に嵌合され、ガイ
ド筒２６…から上方に突出したステム２５…の上端部に
設けられるリテーナ２７，２７およびシリンダヘッド１
６間に、吸気弁ＶＩ，ＶＩを上方すなわち閉弁方向に付
勢する弁ばね２８…が設けられる。また排気弁口２３…
をそれぞれ開閉可能な機関弁としての排気弁ＶＥ，ＶＥ
のステム２９…はシリンダヘッド１６に設けられたガイ
ド筒３０…に摺動可能に嵌合され、ガイド筒３０…から
上方に突出したステム２９…の上端部に設けられるリテ
ーナ３１，３１およびシリンダヘッド１６間に、排気弁
ＶＥ，ＶＥを上方すなわち閉弁方向に付勢する弁ばね３
２…が設けられる。The stems 25 of the intake valves VI, VI capable of opening and closing the intake valve ports 21 are slidably fitted to guide cylinders 26 provided on the cylinder head 16 and upward from the guide cylinders 26. Retainers 27, 27 provided at the upper end of the stem 25 ...
Between 6 are provided valve springs 28 ... For biasing the intake valves VI, VI upward, that is, in the valve closing direction. Exhaust valve port 23 ...
Exhaust valves VE and VE as engine valves that can open and close each
Of the stem 29 are slidably fitted to guide cylinders 30 provided on the cylinder head 16, and retainers 31, 31 and cylinder heads provided on the upper ends of the stems 29 protruding upward from the guide cylinders 30. 16, the valve spring 3 for urging the exhaust valves VE, VE upward, that is, in the closing direction.
2 is provided.
【００１６】両吸気弁ＶＩ，ＶＩは吸気側動弁装置３３
で開閉駆動され、両排気弁ＶＥ，ＶＥは排気側動弁装置
３４で開閉駆動されるものであり、両動弁装置３３，３
４間には、燃焼室２０の中央部に臨んでシリンダヘッド
１６に取付けられる点火プラグ３５を挿入するためのプ
ラグ挿入筒３６が上下に延びるようにして配置され、該
プラグ挿入筒３６の下端はシリンダヘッド１６に取付け
られる。Both intake valves VI, VI are intake side valve operating devices 33.
The exhaust valves VE, VE are opened and closed by the exhaust side valve operating device 34, and the exhaust valves VE, VE are opened and closed by the exhaust valve operating devices 34, 33.
A plug insertion cylinder 36 for inserting the ignition plug 35 attached to the cylinder head 16 facing the center of the combustion chamber 20 is arranged between the four so as to extend vertically, and the lower end of the plug insertion cylinder 36 is It is attached to the cylinder head 16.
【００１７】吸気側動弁装置３３は、一対の吸気弁Ｖ
Ｉ，ＶＩに個別に対応した一対の吸気側ロッカアーム３
７，３８と、両吸気側ロッカアーム３７，３８を揺動可
能に支承する吸気側ロッカシャフト３９と、該ロッカシ
ャフト３９と平行な軸線まわりに回転可能な吸気側カム
シャフト４０とを備える。The intake side valve operating device 33 includes a pair of intake valves V
A pair of intake side rocker arms 3 individually corresponding to I and VI
7, 38, an intake side rocker shaft 39 that swingably supports both intake side rocker arms 37, 38, and an intake side camshaft 40 that is rotatable around an axis parallel to the rocker shaft 39.
【００１８】吸気側ロッカシャフト３９は、各気筒間で
シリンダヘッド１６に設けられたホルダ壁４１，４１…
で固定的に支持されており、両吸気側ロッカアーム３
７，３８の基端が吸気側ロッカシャフト３９で揺動自在
に支承される。また両吸気側ロッカアーム３７，３８の
先端には、対応の吸気弁ＶＩ，ＶＩの上端すなわちステ
ム２５…の上端に当接するタペットねじ４２Ａ，４２Ｂ
が進退位置を調節可能として螺合される。吸気側カムシ
ャフト４０は、図示しないクランクシャフトに１／２の
減速比で連動、連結されるものであり、前記ホルダ壁４
１，４１…と、それらのホルダ壁４１，４１…の上端に
締結されるカムホルダ４３，４３…とで回転自在に支承
される。The intake side rocker shaft 39 has holder walls 41, 41 ... Which are provided on the cylinder head 16 between the cylinders.
Is fixedly supported by both intake side rocker arms 3
The proximal ends of 7, 38 are rockably supported by the intake side rocker shaft 39. Further, tappet screws 42A, 42B that abut the upper ends of the corresponding intake valves VI, VI, that is, the upper ends of the stems 25, at the tips of the intake-side rocker arms 37, 38.
Is screwed so that the forward / backward position can be adjusted. The intake-side camshaft 40 is linked and linked to a crankshaft (not shown) at a reduction ratio of 1/2, and the holder wall 4
, And cam holders 43, 43 ... Fastened to the upper ends of the holder walls 41, 41.
【００１９】吸気側カムシャフト４０には、一方の吸気
側ロッカアーム３７に対応した高速用動弁カム４４と、
他方の吸気側ロッカアーム３８に対応した低速用動弁カ
ム４５とが設けられており、一方の吸気側ロッカアーム
３７に軸支されたローラ４６が高速用動弁カム４４にこ
ろがり接触し、他方の吸気側ロッカアーム３８に軸支さ
れたローラ（図示せず）が低速用動弁カム４５にころが
り接触する。On the intake side camshaft 40, a high speed valve cam 44 corresponding to one intake side rocker arm 37,
A low speed valve actuating cam 45 corresponding to the other intake side rocker arm 38 is provided, and a roller 46 pivotally supported by one intake side rocker arm 37 rolls into contact with the high speed actuating valve cam 44, and the other intake air A roller (not shown) pivotally supported by the side rocker arm 38 makes rolling contact with the low speed valve operating cam 45.
【００２０】しかも両吸気側ロッカアーム３７，３８間
には、両ロッカアーム３７，３８の連動および連動解除
を切換可能な連動切換手段（図示せず）が設けられてお
り、該連動切換手段は、機関の低速運転時には両吸気側
ロッカアーム３７，３８を相互に独立して揺動作動せし
め、機関の高速運転時には両吸気側ロッカアーム３７，
３８を連動して揺動作動せしめる。したがって機関の低
速運転時には、一方の吸気側ロッカアーム３７が高速用
動弁カム４４のカムプロフィルに対応した作動特性で一
方の吸気弁ＶＩを開閉駆動するように揺動作動するのに
対し、他方の吸気側ロッカアーム３８は低速用動弁カム
４５のカムプロフィルに対応した作動特性で他方の吸気
弁ＶＩを開閉駆動するように揺動作動し、機関の高速運
転時には、両吸気側ロッカアーム３７，３８が高速用動
弁カム４４のカムプロフィルに対応した作動特性で両吸
気弁ＶＩ，ＶＩを開閉駆動するように揺動作動する。Further, interlocking switching means (not shown) capable of switching interlocking and interlocking release of both rocker arms 37 and 38 is provided between the intake side rocker arms 37 and 38, and the interlocking switching means is the engine. Both intake side rocker arms 37, 38 are rocked independently of each other during low speed operation of the engine, and both intake side rocker arms 37, 38 are operated during high speed operation of the engine.
38 is interlocked and rocks. Therefore, during low-speed operation of the engine, one intake-side rocker arm 37 swings to open / close one intake valve VI with operating characteristics corresponding to the cam profile of the high-speed valve cam 44, while the other intake-side rocker arm 37 swings. The intake side rocker arm 38 swings so as to open and close the other intake valve VI with an operating characteristic corresponding to the cam profile of the low speed valve cam 45, and both intake side rocker arms 37 and 38 are operated during high speed operation of the engine. The intake valve VI, VI is oscillated so as to open and close with an operating characteristic corresponding to the cam profile of the high speed valve cam 44.
【００２１】排気側動弁装置３４は、一対の排気弁Ｖ
Ｅ，ＶＥに共通である単一の排気側ロッカアーム５０
と、排気側ロッカアーム５０を揺動可能に支承する排気
側ロッカシャフト５１と、該ロッカシャフト５１と平行
な軸線まわりに回転可能な排気側カムシャフト５２とを
備える。The exhaust side valve operating device 34 includes a pair of exhaust valves V
Single exhaust side rocker arm 50 common to E and VE
An exhaust side rocker shaft 51 that swingably supports the exhaust side rocker arm 50, and an exhaust side cam shaft 52 that is rotatable about an axis parallel to the rocker shaft 51.
【００２２】排気側ロッカシャフト５１は、前記吸気側
ロッカシャフト３９と平行な軸線を有するものであり、
該吸気側ロッカシャフト３９と同様にホルダ壁４１，４
１…で固定的に支持される。この排気側ロッカシャフト
５１で排気側ロッカアーム５０の基端が揺動自在に支承
され、排気側ロッカアーム５０の先端には、対応の排気
弁ＶＥ，ＶＥの上端すなわちステム２９…の上端に当接
する弁当接部としての第１および第２タペットねじ５３
Ａ，５３Ｂが進退位置を調節可能として螺合される。ま
た排気側カムシャフト５２は、図示しないクランクシャ
フトに１／２の減速比で連動、連結されるものであり、
前記ホルダ壁４１，４１…と、それらのホルダ壁４１，
４１…の上端に締結されるカムホルダ５４，５４…とで
回転自在に支承される。The exhaust side rocker shaft 51 has an axis parallel to the intake side rocker shaft 39,
Like the intake side rocker shaft 39, the holder walls 41, 4
It is fixedly supported by 1. The base end of the exhaust side rocker arm 50 is swingably supported by the exhaust side rocker shaft 51, and the tip end of the exhaust side rocker arm 50 has a valve box abutting on the upper ends of the corresponding exhaust valves VE, VE, that is, the upper ends of the stems 29 ... First and second tappet screws 53 as contact parts
A and 53B are screwed together so that the forward and backward positions can be adjusted. The exhaust side camshaft 52 is linked and linked to a crankshaft (not shown) at a reduction ratio of 1/2.
And the holder walls 41, 41 ...
41 are rotatably supported by cam holders 54, 54 ...
【００２３】排気側カムシャフト５２には、排気側ロッ
カアーム５０に対応して動弁カム５５が設けられてお
り、排気側ロッカアーム５０に軸支されたカム当接部と
してのローラ５６が前記動弁カム５５にころがり接触す
る。The exhaust side camshaft 52 is provided with a valve actuating cam 55 corresponding to the exhaust side rocker arm 50, and a roller 56 as a cam contact portion pivotally supported by the exhaust side rocker arm 50 serves as the valve actuating device. It comes into rolling contact with the cam 55.
【００２４】図３において、排気側ロッカアーム５０に
は、排気側ロッカシャフト５１を挿通せしめて該ロッカ
シャフト５１で揺動可能に支承される円筒状の揺動支持
部５７が基端に設けられるとともに、前記揺動支持部５
７の両端部から延設される第１および第２支持壁５８，
５９と、第１および第２支持壁５８，５９の先端間を連
結する連結壁６０とが設けられる。In FIG. 3, the exhaust side rocker arm 50 is provided with a cylindrical swinging support portion 57 at the base end, through which an exhaust side rocker shaft 51 is inserted and which is swingably supported by the rocker shaft 51. , The swing support 5
First and second support walls 58 extending from both ends of 7,
59 and a connecting wall 60 that connects between the tips of the first and second support walls 58, 59 are provided.
【００２５】第１および第２支持壁５８，５９の先端に
は、外周面を円弧状とした第１および第２ボス部５８
ａ，５９ａが排気側ロッカシャフト５１の軸線と平行に
並ぶようにして一体に形成される。而して第１および第
２支持壁５８，５９は、排気側ロッカシャフト５１の軸
線に直交する平面に沿うようにして揺動支持部５７の両
端部から延設されており、従って、第１および第２ボス
部５８ａ，５９ａおよび揺動支持部５７が、排気側ロッ
カシャフト５１の軸線に直交する第１および第２支持壁
５８，５９で連結される。At the tips of the first and second support walls 58 and 59, first and second boss portions 58 whose outer peripheral surfaces are arcuate are formed.
a and 59a are formed integrally so as to be aligned in parallel with the axis of the exhaust side rocker shaft 51. First and second support walls 58 and 59 Thus is extended from both ends of the swinging support section 57 so as to be along a plane perpendicular to the axis of the exhaust-side rocker shaft 51, therefore, first and second boss portions 58a, 59a and the swinging support section 57, Ru is connected in the first and second support walls 58, 59 perpendicular to the axis of the exhaust-side rocker shaft 51.
【００２６】前記各ボス部５８ａ，５９ａには第１およ
び第２タペットねじ５３Ａ，５３Ｂを螺合せしめるねじ
孔６１Ａ，６１Ｂが設けられる。またローラ５６は、前
記揺動支持部５７および両タペットねじ５３Ａ，５３Ｂ
間の中間部すなわち排気側ロッカシャフト５１の軸線か
らずれた位置で排気側ロッカアーム５０に軸支されてい
る。The boss portions 58a and 59a are provided with screw holes 61A and 61B into which the first and second tappet screws 53A and 53B are screwed. The roller 56 includes the swing support portion 57 and the tappet screws 53A and 53B.
It is pivotally supported by the exhaust side rocker arm 50 at an intermediate portion, that is, at a position deviated from the axis of the exhaust side rocker shaft 51.
【００２７】前記第１および第２タペットねじ５３Ａ，
５３Ｂのうち排気側ロッカシャフト５１の軸線に沿う一
端側（図３の下端側）に配置される第１タペットねじ５
３Ａの中心すなわち第１ボス部５８ａにおけるねじ孔６
１Ａの中心およびローラ５６への動弁カム５５の接触範
囲（図３の交差する斜線部で示す範囲）を通る第１直線
Ｌ１と、前記第１および第２タペットねじ５３Ａ，５３
Ｂのうち排気側ロッカシャフト５１の軸線に沿う他端側
（図３の上端側）に配置される第２タペットねじ５３Ｂ
の中心すなわち第２ボス部５９ａにおけるねじ孔６１Ｂ
の中心およびローラ５６への動弁カム５５の接触範囲を
通る第２直線Ｌ２と、排気側ロッカシャフト５１の軸線
Ｃとが排気側ロッカアーム５０の平面視で交わる交点Ｐ
１，Ｐ２は、揺動支持部５７の軸方向両端よりも内方に
配置される。すなわち揺動支持部５７は第１および第２
交点Ｐ１，Ｐ２よりも外方に両端面が配置される長さを
有するように形成される。また前記第１および第２直線
Ｌ１，Ｌ２は、ローラ５６への動弁カム５５の接触範囲
の中心を通ることが望ましい。The first and second tappet screws 53A,
The first tappet screw 5 arranged on one end side (lower end side in FIG. 3) along the axis of the exhaust side rocker shaft 51 of 53B.
3A center, that is, the screw hole 6 in the first boss portion 58a
The first straight line L1 passing through the center of 1A and the contact range of the valve cam 55 with the roller 56 (the range shown by the intersecting diagonal lines in FIG. 3) and the first and second tappet screws 53A, 53.
A second tappet screw 53B arranged on the other end side (upper end side in FIG. 3) along the axis of the exhaust side rocker shaft 51 of B
Of the screw hole 61B in the center of the second boss 59a
An intersection P where the second straight line L2 passing through the center of the valve and the contact range of the valve cam 55 to the roller 56 and the axis C of the exhaust side rocker shaft 51 intersect in a plan view of the exhaust side rocker arm 50.
1, P2 are arranged inward of both ends of the swing support portion 57 in the axial direction. That is, the swing support portion 57 includes the first and second
It is formed to have a length such that both end surfaces are arranged outside the intersections P1 and P2. Further, it is desirable that the first and second straight lines L1 and L2 pass through the center of the contact range of the valve operating cam 55 with the roller 56.
【００２８】しかも揺動支持部５７は、第１および第２
タペットねじ５３Ａ，５３Ｂの中心間の距離よりも長く
形成されており、第１および第２タペットねじ５３Ａ，
５３Ｂの中心を通って排気側ロッカシャフト５１の軸線
Ｃに直交する第３および第４直線Ｌ３，Ｌ４が、揺動支
持部５７の軸方向両端よりも内方に配置される。Moreover, the swing support portion 57 includes the first and second swing support portions.
It is formed longer than the distance between the centers of the tappet screws 53A and 53B, and the first and second tappet screws 53A and 53A
The third and fourth straight lines L3 and L4, which pass through the center of 53B and are orthogonal to the axis C of the exhaust side rocker shaft 51, are arranged inward of both axial ends of the swing support portion 57.
【００２９】図４〜図６を併せて参照して、第１および
第２支持壁５８，５９間で排気側ロッカアーム５０に
は、前記ローラ５６を収容する矩形の開口部６２が設け
られており、第１および第２支持壁５８，５９間の距離
よりも短い長さを有するとともに排気側ロッカシャフト
５１と平行な軸線を有するローラ軸６３が前記開口部６
２を横切って排気側ロッカアーム５０に固定され、ロー
ラ５６はニードルベアリング６４を介して該ローラ軸６
３に回転自在に支持される。Referring also to FIGS. 4 to 6, the exhaust side rocker arm 50 is provided between the first and second support walls 58 and 59 with a rectangular opening 62 for accommodating the roller 56. , The roller shaft 63 having a length shorter than the distance between the first and second support walls 58 and 59 and having an axis parallel to the exhaust side rocker shaft 51.
2 is fixed to the exhaust side rocker arm 50, and the roller 56 is mounted on the roller shaft 6 via a needle bearing 64.
3 is rotatably supported.
【００３０】第１および第２支持壁５８，５９と、前記
開口部６２との間にわたっては、排気側ロッカシャフト
５１と平行に延びて円筒状に形成される一対の軸支持部
６５５，６５が設けられ、それらの軸支持部６５，６５
内に、内端を前記開口部６２に開口するとともに外端を
排気側ロッカアーム５０の外側方すなわち第１および第
２支持壁５８，５９の外側方に開口する軸挿入孔６６，
６６が同軸に設けられる。Between the first and second support walls 58 and 59 and the opening 62, a pair of cylindrical shaft support portions 655 and 65 extending in parallel with the exhaust side rocker shaft 51 are formed. Are provided and their shaft support portions 65, 65
A shaft insertion hole 66 having an inner end opened to the opening 62 and an outer end opened to the outside of the exhaust side rocker arm 50, that is, to the outside of the first and second support walls 58 and 59.
66 is provided coaxially.
【００３１】軸挿入孔６６は、開口部６２側の第１挿入
孔部６６ａと、第１挿入孔部６６ａの外端に内端を連な
らせる第２挿入孔部６６ｂとから成り、第１挿入孔部６
６ａと、第１挿入孔部６６ａおよび第２挿入孔部６６ｂ
との間には開口部６２と反対側に臨む段部６６ｃが形成
される。而して第１および第２挿入孔部６６ａ，６６ｂ
は、相互６６ａ，６６ｂ間に環状の段部６６ｃを形成す
るようにして同軸の円形孔となるように形成されること
が望ましく、そうすれば穿孔加工が容易となるのである
が、横断面円形である第１挿入孔部６６ａに対して第２
挿入孔部６６ｂの横断面が非円形であってもよく、第２
挿入孔部６６ｂは、ローラ軸６３を挿入可能であって第
１挿入孔部６６ａとの間に開口部６２とは反対側に臨む
段部６６ｃを形成するものであればよい。The shaft insertion hole 66 comprises a first insertion hole portion 66a on the side of the opening 62 and a second insertion hole portion 66b for connecting the inner end to the outer end of the first insertion hole portion 66a. Insertion hole 6
6a, first insertion hole 66a and second insertion hole 66b
A step portion 66c facing the opening 62 is formed between and. Thus, the first and second insertion hole portions 66a, 66b
Is preferably formed into a coaxial circular hole by forming an annular step 66c between the mutual 66a and 66b, which facilitates drilling, but has a circular cross section. Second with respect to the first insertion hole 66a which is
The cross section of the insertion hole portion 66b may be non-circular, and
The insertion hole portion 66b may be one that can insert the roller shaft 63 and forms a step portion 66c facing the side opposite to the opening portion 62 with the first insertion hole portion 66a.
【００３２】ローラ軸６３は、両軸挿入孔６６，６６の
うち該ローラ軸６３の両端よりも軸方向外方部分を中空
状態に残したまま両軸挿入孔６６，６６の内端部に嵌
合、固定されるものであり、その嵌合、固定にあたり、
第１挿入孔部６６ａ，６６ａに両端を嵌合せしめたロー
ラ軸６３の両端部外周縁が両軸挿入孔６６，６６の前記
段部６６ｃ，６６ｃにかしめ係合される。これによりロ
ーラ軸６３の排気側ロッカアーム５０への固定状態で該
ローラ軸６３の両端よりも軸方向外方部分で排気側ロッ
カアーム５０には肉抜き部６７，６７が形成されること
になる。The roller shaft 63 is fitted in the inner end portions of the both shaft insertion holes 66, 66 while leaving a portion of the both shaft insertion holes 66, 66 axially outer than both ends of the roller shaft 63 in a hollow state. When they are fitted and fixed,
The outer peripheral edges of both ends of the roller shaft 63 fitted at both ends in the first insertion hole portions 66a, 66a are caulkedly engaged with the stepped portions 66c, 66c of the both shaft insertion holes 66, 66. As a result, when the roller shaft 63 is fixed to the exhaust-side rocker arm 50, the exhaust-side rocker arm 50 is formed with lightening portions 67, 67 at the portions axially outward of both ends of the roller shaft 63.
【００３３】円筒状である揺動支持部５７は、排気側ロ
ッカシャフト５１を囲繞する薄肉円筒部５７ａの軸方向
両端に、排気側ロッカシャフト５１を囲繞する円筒状に
して前記薄肉円筒部５７ａよりも肉厚の厚肉円筒部５７
ｂ，５７ｂがそれぞれ一体に連設されて成るものであ
り、第１および第２支持壁５８，５９は厚肉円筒部５７
ｂ，５７ｂに連設される。The rocking support portion 57 having a cylindrical shape has a cylindrical shape surrounding the exhaust side rocker shaft 51 at both axial ends of the thin walled cylindrical portion 57a surrounding the exhaust side rocker shaft 51. Thick-walled cylindrical portion 57
b and 57b are integrally connected to each other, and the first and second support walls 58 and 59 are made of a thick cylindrical portion 57.
b and 57b are connected to each other.
【００３４】図７を併せて参照して、前記両厚肉円筒部
５７ｂ，５７ｂにおいて、第１および第２支持壁５８，
５９の連設部に対応する内面下部には、排気側ロッカシ
ャフト５１の外面との間にオイルを溜め得る溝６８，６
８がそれぞれ円弧状にして設けられる。Referring also to FIG. 7, in both of the thick-walled cylindrical portions 57b, 57b, the first and second support walls 58,
Grooves 68, 6 capable of storing oil between the exhaust side rocker shaft 51 and the outer surface are formed in the lower portion of the inner surface corresponding to the continuous portion of 59.
8 are provided in an arc shape.
【００３５】排気側ロッカアーム５０の上面において、
第１および第２支持壁５８，５９、連結壁６０および揺
動支持部５７で囲まれる部分には、開口部６２内のロー
ラ５６にオイルを供給することが可能である凹部６９，
７０が形成される。On the upper surface of the exhaust side rocker arm 50,
In a portion surrounded by the first and second support walls 58 and 59, the connecting wall 60 and the swing support portion 57, it is possible to supply oil to the roller 56 in the opening 62, and a recess 69,
70 is formed.
【００３６】一方の凹部６９は、前記両軸支時部６５，
６５および揺動支持部５７間で排気側ロッカアーム５０
に形成され、他方の凹部７０は、前記両軸支時部６５，
６５および前記連結壁６０間で排気側ロッカアーム５０
に形成される。One of the recesses 69 is provided with the both shaft supporting portions 65,
65 and the rocking | fluctuation support part 57 between the rocker arm 50 of the exhaust side.
And the other concave portion 70 is formed on both shaft supporting portions 65,
65 and the connecting wall 60 between the exhaust side rocker arm 50
Is formed.
【００３７】前記揺動支持部５７の軸方向中央部すなわ
ち薄肉円筒部５７ａの軸方向中間部は、プラグ挿入筒３
６に対応する位置に配置されるものであり、このプラグ
挿入筒３６に対応した位置で揺動支持部５７および排気
側ロッカシャフト５１には、プラグ挿入筒３６とは反対
側に凹んだ円弧状にして相互に円滑に連なる切欠き７
１，７２が設けられ、プラグ挿入筒３６の一部は切欠き
７１内に収容される。しかも前記切欠き７１，７２は、
第１および第２支持壁５８，５９の揺動支持部５７への
連設部間で揺動支持部５７および排気側ロッカシャフト
５１に設けられている。The axial center portion of the swing support portion 57, that is, the axial intermediate portion of the thin cylindrical portion 57a, is the plug insertion tube 3.
6 is arranged at a position corresponding to the plug insertion cylinder 36, and the swing support portion 57 and the exhaust side rocker shaft 51 have a circular arc shape recessed on the side opposite to the plug insertion cylinder 36 at a position corresponding to the plug insertion cylinder 36. Notches 7 that smoothly connect to each other
1, 72 are provided, and a part of the plug insertion cylinder 36 is housed in the notch 71. Moreover, the notches 71 and 72 are
The rocking support portion 57 and the exhaust-side rocker shaft 51 are provided between the first and second support walls 58 and 59 connected to the rocking support portion 57.
【００３８】また揺動支持部５７には、排気側ロッカシ
ャフト５１の軸線Ｃに関して前記切欠き７１とは反対側
で前記開口部６２に外端を開口させたオイル噴出孔７３
が設けられ、排気側ロッカシャフト５１には、その軸線
Ｃに沿って延びる給油路７４と、該給油路７４に連通す
るとともに外端を前記オイル噴出孔７３の内端に連通さ
せ得る給油孔７５とが設けられる。而して給油路７４は
図示しないオイル供給源に接続される。したがって排気
側ロッカシャフト５１内の給油路７４から給油孔７５お
よびオイル噴出孔７３を介してローラ５６にオイルを供
給するようにしてローラ５６を潤滑することが可能であ
る。なお排気側ロッカアーム５０の揺動状態によって給
油孔７５およびオイル噴出孔７３間が遮断されるが、そ
の遮断状態では給油孔７５からのオイルが揺動支持部５
７および排気側ロッカシャフト５１間の潤滑に用いら
れ、揺動支持部５７の内面の溝６８，６８にもオイルが
供給される。Further, the rocking support portion 57 has an oil ejection hole 73 whose outer end is opened to the opening portion 62 on the side opposite to the cutout 71 with respect to the axis C of the exhaust side rocker shaft 51.
The exhaust-side rocker shaft 51 is provided with an oil supply passage 74 extending along the axis C thereof, and an oil supply hole 75 communicating with the oil supply passage 74 and having an outer end connected to an inner end of the oil ejection hole 73. And are provided. Thus, the oil supply passage 74 is connected to an oil supply source (not shown). Therefore, it is possible to lubricate the roller 56 by supplying oil to the roller 56 from the oil supply passage 74 in the exhaust side rocker shaft 51 via the oil supply hole 75 and the oil ejection hole 73. Note that the rocking state of the exhaust side rocker arm 50 blocks the gap between the oil supply hole 75 and the oil ejection hole 73. In the blocked state, the oil from the oil supply hole 75 swings.
7 is used for lubrication between the rocker shaft 51 and the exhaust side rocker shaft 51, and oil is also supplied to the grooves 68, 68 on the inner surface of the swing support portion 57.
【００３９】第１および第２支持壁５８，５９の先端間
すなわち第１および第２ボス部５８，５９ａを連結する
連結壁６０は、排気側ロッカシャフト５１の軸線Ｃすな
わち排気側ロッカアーム５０の揺動軸線と直角な平面内
で相互に直交する第１および第２壁部６０ａ，６０ｂか
ら成るものであり、両壁部６０ａ，６０ｂは前記平面内
でたとえば略Ｌ字状となるように直交する。The connecting wall 60 between the tips of the first and second support walls 58, 59, that is, the first and second boss portions 58, 59a is connected to the axis C of the exhaust side rocker shaft 51, that is, the swing side rocker arm 50. The first and second wall portions 60a and 60b are orthogonal to each other in a plane perpendicular to the axis of motion, and both wall portions 60a and 60b are orthogonal to each other in the plane so as to be, for example, substantially L-shaped. .
【００４０】しかも第２壁部６０ｂは、排気側ロッカシ
ャフト５１の軸線と平行に延びるとともに外面を前記第
１および第２ボス部５８ａ，５９ａの先端外側面に面一
に連ならせるように形成される。また第１壁部６０ａの
内面の一部で前記開口部６２の一側面が形成される。Moreover, the second wall portion 60b is formed so as to extend in parallel with the axis of the exhaust side rocker shaft 51 and to have its outer surface flush with the outer end surfaces of the first and second boss portions 58a, 59a. To be done. Further, one side surface of the opening portion 62 is formed by a part of the inner surface of the first wall portion 60a.
【００４１】次にこの実施例の作用について説明する
と、排気側ロッカアーム５０において、排気側ロッカシ
ャフト５１の軸線Ｃと平行に並ぶ第１および第２タペッ
トねじ５３Ａ，５３Ｂのうち排気側ロッカシャフト５１
の軸線Ｃに沿う一端側に配置される第１タペットねじ５
３Ａの中心ならびにローラ５６への動弁カム５５の接触
範囲好ましくは該範囲の中心を通る第１直線Ｌ１と、第
１および第２タペットねじ５３Ａ，５３Ｂのうち排気側
ロッカシャフト５１の軸線Ｃに沿う他端側に配置される
第２タペットねじ５３Ｂの中心ならびにローラ５６への
動弁カム５５の接触範囲好ましくは該範囲の中心を通る
第２直線Ｌ２と、排気側ロッカシャフト５１の軸線Ｃと
が排気側ロッカアーム５０の平面視で交わる交点Ｐ１，
Ｐ２が、排気側ロッカシャフト５１で揺動可能に支承さ
れる円筒状の揺動支持部５７の軸方向両端よりも内方に
配置されている。Next, the operation of this embodiment will be described. In the exhaust side rocker arm 50, the exhaust side rocker shaft 51 among the first and second tappet screws 53A and 53B arranged in parallel with the axis C of the exhaust side rocker shaft 51.
First tappet screw 5 arranged on one end side along the axis C of the
3A and the contact range of the valve cam 55 to the roller 56, preferably the first straight line L1 passing through the center of the range and the axis C of the exhaust side rocker shaft 51 of the first and second tappet screws 53A and 53B. A second straight line L2 passing through the center of the second tappet screw 53B arranged on the other end side and the contact area of the valve cam 55 to the roller 56, preferably the center of the range, and the axis C of the exhaust side rocker shaft 51. Is the intersection P1, where the exhaust side rocker arm 50 intersects in plan view.
P2 is arranged inward of both axial ends of a cylindrical rocking support portion 57 that is rockably supported by the exhaust side rocker shaft 51.
【００４２】したがって第１および第２タペットねじ５
３Ａ，５３Ｂでのタペットクリアランスに差が生じ、第
１もしくは第２直線Ｌ１，Ｌ２上で大きな荷重が発生し
て排気側ロッカアーム５０を傾けようとしても、第１お
よび第２直線Ｌ１，Ｌ２上で揺動支持部５７が排気側ロ
ッカシャフト５１に支持されており、排気側ロッカアー
ム５０を安定的に支持することができる。この結果、揺
動支持部５７およびローラ５６に偏摩耗が生じることも
防止することができる。Therefore, the first and second tappet screws 5
Even if there is a difference in tappet clearance between 3A and 53B and a large load is generated on the first or second straight lines L1 and L2 and the exhaust side rocker arm 50 is inclined, the first and second straight lines L1 and L2 are inclined. The swing support portion 57 is supported by the exhaust side rocker shaft 51, and can stably support the exhaust side rocker arm 50. As a result, uneven wear of the swing support portion 57 and the roller 56 can be prevented.
【００４３】また揺動支持部５７は、第１および第２タ
ペットねじ５３Ａ，５３Ｂの中心間の距離よりも長く形
成されており、第１および第２タペットねじ５３Ａ，５
３Ｂの中心を通って排気側ロッカシャフト５１の軸線Ｃ
に直交する第３および第４直線Ｌ３，Ｌ４が、揺動支持
部５７の軸方向両端よりも内方に配置されるので、両タ
ペットねじ５３Ａ，５３Ｂ間の距離以上の長さで揺動支
持部５７が排気側ロッカシャフト５２に支持されること
になり、排気側ロッカアーム５０をより安定的に支持す
ることが可能となる。Further, the swing support portion 57 is formed longer than the distance between the centers of the first and second tappet screws 53A and 53B, and the first and second tappet screws 53A and 5B.
Axis C of exhaust side rocker shaft 51 passing through the center of 3B
Since the third and fourth straight lines L3 and L4 orthogonal to each other are arranged inward of both ends of the swing support portion 57 in the axial direction, the swing support is performed with a length equal to or greater than the distance between the tappet screws 53A and 53B. Since the portion 57 is supported by the exhaust side rocker shaft 52, the exhaust side rocker arm 50 can be supported more stably.
【００４４】排気側ロッカアーム５０にはローラ軸６３
が嵌合、固定され、動弁カム５５にころがり接触するロ
ーラ５６が該ローラ軸６３で回転自在に支持されるので
あるが、このローラ軸６３は、揺動支持部５７の両端部
から延設される第１および第２支持壁５８．５９間の距
離よりも短いものであり、排気側ロッカアーム５０に同
軸に設けられた一対の軸挿入孔６６，６６の内端部に、
両軸挿入孔６６，６６のうち該ローラ軸６３の両端より
も軸方向外方部分を中空の肉抜き部６７，６７として残
したままローラ軸６３が嵌合、固定される。A roller shaft 63 is attached to the exhaust side rocker arm 50.
The roller 56, which is fitted and fixed and which makes rolling contact with the valve operating cam 55, is rotatably supported by the roller shaft 63. The roller shaft 63 extends from both ends of the swing support portion 57. Is shorter than the distance between the first and second support walls 58.59, and is provided at the inner end portions of the pair of shaft insertion holes 66, 66 provided coaxially to the exhaust side rocker arm 50.
The roller shaft 63 is fitted and fixed while leaving portions of the both shaft insertion holes 66, 66 axially outer than both ends of the roller shaft 63 as hollow lightening portions 67, 67.
【００４５】これにより、ローラ軸６３の両端よりも軸
方向外方では軸挿入孔６６，６６が中空状態のままで残
り、排気側ロッカアーム５０全体の重量を低減すること
ができ、排気側ロッカアーム５０の両側からローラ軸６
３の該ロッカアーム５０への固定状態を確認することも
可能となる。しかもローラ軸６３を比較的短くして該ロ
ーラ軸６３の排気側ロッカアーム５０への組付が容易と
なるとともに、ローラ軸６３の変形が生じ難くして排気
側ロッカアーム５０の適正な揺動作動を保証することが
できる。また第１および第２支持壁５８，５９には排気
弁ＶＥ，ＶＥからの荷重が作用するのであるが、その荷
重作用部分を避けた位置に配置されるローラ軸６３でロ
ーラ５６を支持することができるのでローラ５６の支持
剛性を高めることができる。As a result, the shaft insertion holes 66, 66 remain hollow outside the both ends of the roller shaft 63 in the axial direction, the weight of the exhaust side rocker arm 50 as a whole can be reduced, and the exhaust side rocker arm 50 can be reduced. Roller shaft 6 from both sides of
It is also possible to confirm the state of fixation of No. 3 to the rocker arm 50. Moreover, by making the roller shaft 63 relatively short, the roller shaft 63 can be easily assembled to the exhaust side rocker arm 50, and the roller shaft 63 is less likely to be deformed so that the exhaust side rocker arm 50 can be properly swung. Can be guaranteed. The loads from the exhaust valves VE, VE act on the first and second support walls 58, 59, but the roller 56 should be supported by the roller shaft 63 arranged at a position avoiding the load acting part. Therefore, the supporting rigidity of the roller 56 can be increased.
【００４６】前記軸挿入孔６６は、ローラ５６を収容し
た開口部６２側の第１挿入孔部６６ａと、開口部６２と
は反対側に臨む段部６６ｃを第１挿入孔部６６ａとの間
に形成して第１挿入孔部６６ａの外端に内端を連ならせ
る第２挿入孔部６６ｂとから成り、両軸挿入孔６６，６
６の第１挿入孔部６６ａ，６６ａにそれぞれ嵌合される
ローラ軸６３の両端部が前記段部６６ｃにそれぞれかし
め係合されることで、ローラ軸６３が軸挿入孔６６，６
６に嵌合、固定されている。このため軸挿入孔６６，６
６のうち中空状態のままで残る部分すなわち肉抜き部６
７，６７を第２挿入孔部６６ｂ，６６ｂとして大きく
し、排気側ロッカアーム５０全体の重量をより一層低減
することができ、ローラ軸６３をかしめて排気側ロッカ
アーム５０に固定するので、ローラ軸６３の排気側ロッ
カアーム５０への組付がより一層容易となる。The shaft insertion hole 66 is formed between the first insertion hole 66a on the side of the opening 62 accommodating the roller 56 and the step 66c facing the side opposite to the opening 62 from the first insertion hole 66a. And a second insertion hole portion 66b that is formed on the first insertion hole portion 66a and connects the inner end to the outer end of the first insertion hole portion 66a.
When the both ends of the roller shaft 63 fitted in the first insertion hole portions 66a, 66a of No. 6 are caulkedly engaged with the stepped portion 66c, the roller shaft 63 is inserted into the shaft insertion holes 66, 6a.
6 is fitted and fixed. Therefore, the shaft insertion holes 66, 6
6, a portion that remains in a hollow state, that is, a lightening portion 6
7, 67 can be enlarged as the second insertion holes 66b, 66b to further reduce the weight of the exhaust side rocker arm 50, and the roller shaft 63 can be caulked and fixed to the exhaust side rocker arm 50. It is even easier to assemble the same to the exhaust side rocker arm 50.
【００４７】さらに前記両軸挿入孔６６，６６をそれぞ
れ形成する一対の円筒状の軸支持部６５，６５が、第１
および第２支持壁５８，５９および前記開口部６２間に
わたって排気側ロッカアーム５０に設けられており、ロ
ーラ軸６３を介して連なる一対の円筒状の軸支持部６
５，６５が両支持壁５８，５９に連設されるので、両支
持壁５８，５９の剛性およびローラ５６の支持剛性をよ
り一層高めることができる。Further, a pair of cylindrical shaft support portions 65, 65 forming the shaft insertion holes 66, 66, respectively, are
The pair of cylindrical shaft support portions 6 provided on the exhaust-side rocker arm 50 extending between the second support walls 58 and 59 and the opening portion 62 and connected via the roller shaft 63.
Since 5 and 65 are connected to both support walls 58 and 59, the rigidity of both support walls 58 and 59 and the support rigidity of roller 56 can be further enhanced.
【００４８】排気側ロッカシャフト５１で揺動可能に支
承すべく排気側ロッカアーム５０の基端に設けられる円
筒状の揺動支持部５７は、排気側ロッカシャフト５１を
囲繞する薄肉円筒部５７ａの軸方向両端に、排気側ロッ
カシャフト５１を囲繞する円筒状にして前記薄肉円筒部
５７ａよりも肉厚の厚肉円筒部５７ｂ，５７ｂがそれぞ
れ一体に連設されて成るものであり、揺動支持部５７の
中央側を薄肉として排気側ロッカアーム５０の重量増大
を回避しつつ、大きな荷重が作用する可能性がある揺動
支持部５７の両端部を肉厚として排気側ロッカアーム５
０の支持剛性を高め、耐久性の向上を図ることができ
る。The cylindrical rocking support portion 57 provided at the base end of the exhaust side rocker arm 50 so as to be swingably supported by the exhaust side rocker shaft 51 is a shaft of a thin cylindrical portion 57a surrounding the exhaust side rocker shaft 51. At both ends in the direction, thick-walled cylindrical portions 57b, 57b, which are cylindrical and surround the exhaust-side rocker shaft 51 and are thicker than the thin-walled cylindrical portion 57a, are integrally connected to each other. The rocking arm 57 has a thin wall on the center side of 57 to avoid an increase in the weight of the exhaust side rocker arm 50, and has a thick wall at both ends of the swing support portion 57 where a large load may be applied.
The support rigidity of 0 can be increased and the durability can be improved.
【００４９】また排気側ロッカシャフト５１の軸線に沿
う揺動支持部５７の両端部内面、すなわち厚肉円筒部５
７ｂ，５７ｂの内面に、排気側ロッカシャフト５１の外
面との間にオイルを溜め得る溝６８，６８がそれぞれ設
けられている。したがって揺動支持部５７の両端部およ
び排気側ロッカシャフト５１間にオイルを溜めることが
可能であり、排気側ロッカアーム５０がたとえ傾いても
偏摩耗が生じることを極力防止するようにして耐久性を
向上することが可能であり、しかも揺動支持部５７の両
端部内面に溝６８，６８が設けられるだけであるので排
気側ロッカアーム５０の重量が増大することはなく、溝
６８，６８による揺動支持部５７の剛性低下を抑えるこ
とができる。Also, the inner surfaces of both ends of the swing support portion 57 along the axis of the exhaust side rocker shaft 51, that is, the thick-walled cylindrical portion 5
Grooves 68, 68 capable of storing oil are provided between the inner surfaces of 7b and 57b and the outer surface of the exhaust side rocker shaft 51, respectively. Therefore, oil can be collected between both ends of the rocking support portion 57 and the exhaust side rocker shaft 51, and even if the exhaust side rocker arm 50 tilts, uneven wear is prevented as much as possible to improve durability. It is possible to improve, and since only the grooves 68, 68 are provided on the inner surfaces of both ends of the rocking support portion 57, the weight of the exhaust side rocker arm 50 does not increase, and the rocking by the grooves 68, 68 does not occur. It is possible to prevent the rigidity of the support portion 57 from decreasing.
【００５０】しかも排気弁ＶＥ，ＶＥの上端に当接する
第１および第２タペットねじ５３Ａ，５３Ｂが先端に設
けられる第１および第２支持壁５８，５９が、前記溝６
８，６８に対応する部分で揺動支持部５７の両端部から
延設されるので、揺動支持部５７の両端部の剛性が溝６
８，６８が設けられることによってわずかに低下するの
を、第１および第２支持壁５８，５９で補強することが
できる。Moreover, the first and second support walls 58 and 59 provided at the tips of the first and second tappet screws 53A and 53B, which come into contact with the upper ends of the exhaust valves VE and VE, are provided with the groove 6 described above.
Since the portions corresponding to 8 and 68 extend from both ends of the rocking support portion 57, the rigidity of the both ends of the rocking support portion 57 is equal to that of the groove 6.
The slight decrease due to the provision of 8,68 can be reinforced by the first and second support walls 58,59.
【００５１】排気側ロッカアーム５０の外周は揺動支持
部５７、第１支持壁５８、第２支持壁５９および連結壁
６０で構成されており、揺動支持部５７、第１支持壁５
８、第２支持壁５９および連結壁６０で囲まれる部分
で、排気側ロッカアーム５０の少なくとも上面に凹部６
９，７０が形成されるので、排気側ロッカアーム５０の
剛性が低下するのを回避しつつ、該排気側ロッカアーム
５０の重量低減を図ることが可能となる。The outer periphery of the rocker arm 50 on the exhaust side is composed of a swing support portion 57, a first support wall 58, a second support wall 59 and a connecting wall 60, and the swing support portion 57, the first support wall 5
8, the second support wall 59 and the connection wall 60, and the recess 6 at least on the upper surface of the exhaust side rocker arm 50.
Since 9, 70 are formed, it is possible to reduce the weight of the exhaust side rocker arm 50 while avoiding a decrease in the rigidity of the exhaust side rocker arm 50.
【００５２】しかも一方の凹部６９は、一対の軸支持部
６５，６５および揺動支持部５７間に配置され、開口部
６２に収容されたローラ５６にオイルを供給することが
きるので、排気側ロッカアーム５０のうち揺動量が比較
的小さい部分に動弁室内で飛散しているオイルを確実に
溜めてローラ５６を確実に潤滑することができ、ローラ
５６にオイルを供給するための通路を排気側ロッカアー
ム５０に設けることを不要として排気側ロッカアーム５
０ の加工工数を低減することができる。Further, the one concave portion 69 is arranged between the pair of shaft supporting portions 65, 65 and the swing supporting portion 57, and oil can be supplied to the roller 56 accommodated in the opening portion 62. Oil scattered in the valve operating chamber can be reliably collected in a portion of the rocker arm 50 where the swing amount is relatively small, so that the roller 56 can be reliably lubricated, and a passage for supplying oil to the roller 56 is provided on the exhaust side. The rocker arm 50 does not need to be provided to the exhaust side rocker arm 5
It is possible to reduce the processing man-hour of 0.
【００５３】また他方の凹部７０は、前記両軸支時部６
５，６５および連結壁６０間でローラ５６へのオイルの
供給を可能として排気側ロッカアーム５０に形成されて
いるので、ローラ５６への潤滑を果たしつつ、排気側ロ
ッカアーム５０の先端側を軽量化して慣性重量の軽減を
図ることができる。On the other hand, the other concave portion 70 is formed on both the shaft supporting portions 6
Since the exhaust-side rocker arm 50 is formed to allow the oil to be supplied to the roller 56 between 5, 65 and the connecting wall 60, the tip end side of the exhaust-side rocker arm 50 can be lightened while lubricating the roller 56. It is possible to reduce the inertial weight.
【００５４】ところで、排気側ロッカアーム５０におけ
る前記揺動支持部５７の軸方向中央部は、シリンダヘッ
ド１６に取付けられるプラグ挿入筒３６に対応する位置
に配置されるのであるが、該プラグ挿入筒３６に対応し
た位置で揺動支持部５７および排気側ロッカシャフト５
１には、プラグ挿入筒３６とは反対側に凹んだ円弧状に
して相互に円滑に連なる切欠き７１，７２が設けられて
いる。このため、排気側ロッカアーム５０の重量を低減
することができるだけでなく、プラグ挿入筒３０の一部
を、切欠き７１内に収容させるようにして排気側ロッカ
シャフト５１およびプラグ挿入筒３６を相互に近接配置
することが可能であり、排気側ロッカアーム５０の動弁
室内でのレイアウト上の制約を緩和して機関全体のコン
パクト化に寄与することができる。By the way, the axial center portion of the rocking support portion 57 of the exhaust side rocker arm 50 is arranged at a position corresponding to the plug insertion cylinder 36 attached to the cylinder head 16. The rocking support portion 57 and the exhaust side rocker shaft 5 at a position corresponding to
1 is provided with notches 71 and 72 which are recessed on the side opposite to the plug insertion cylinder 36 and which are smoothly connected to each other in an arc shape. For this reason, not only can the weight of the exhaust side rocker arm 50 be reduced, but also the exhaust side rocker shaft 51 and the plug insertion cylinder 36 can be mutually inserted by accommodating a part of the plug insertion cylinder 30 in the notch 71. They can be arranged close to each other, and the restriction on the layout of the exhaust side rocker arm 50 in the valve operating chamber can be relaxed, which contributes to downsizing of the entire engine.
【００５５】しかも切欠き７１，７２が、第１および第
２支持壁５８，５９の揺動支持部５７への連設部間で揺
動支持部５７および排気側ロッカシャフト５１に設けら
れているので、切欠き７１，７２を排気弁ＶＥ，ＶＥの
動弁駆動時に作用する応力が比較的小さい部分に配置し
て、切欠き７１を排気側ロッカアーム５０に設けること
による剛性上の影響を小さくして、排気側ロッカアーム
５０を軽量化することができる。Moreover, the notches 71 and 72 are provided in the swing support portion 57 and the exhaust side rocker shaft 51 between the connecting portions of the first and second support walls 58 and 59 to the swing support portion 57. Therefore, the notches 71 and 72 are arranged in a portion where the stress acting during valve driving of the exhaust valves VE and VE is relatively small, so that the rigidity effect of providing the notches 71 on the exhaust side rocker arm 50 is reduced. Thus, the weight of the exhaust side rocker arm 50 can be reduced.
【００５６】ローラ５６には、排気側ロッカシャフト５
１内の給油路７４から給油孔７５およびオイル噴出孔７
３を介してオイルが供給されるが、オイル噴出孔７３
は、排気側ロッカシャフト７１において切欠き７２が設
けられる部分の外面を臨ませるようにして揺動支持部５
７に設けられる切欠き７１に対して、排気側ロッカシャ
フト５１の軸線Ｃに関して反対側で揺動支持部５７に設
けられているので、切欠き７１側からオイル噴出孔７３
の穿孔加工を行なうことが可能であり、オイル噴出孔７
３の穿孔加工が容易となる。The roller 56 includes the rocker shaft 5 on the exhaust side.
1 oil supply passage 74 to oil supply hole 75 and oil ejection hole 7
Oil is supplied through the
Is the rocking support portion 5 such that the outer surface of the exhaust side rocker shaft 71 where the notch 72 is provided faces.
Since the rocking support portion 57 is provided on the opposite side with respect to the axis line C of the exhaust side rocker shaft 51 with respect to the notch 71 provided in the oil 7, the oil ejection hole 73 is provided from the notch 71 side.
It is possible to drill the
The drilling process of 3 becomes easy.
【００５７】また排気弁ＶＥ，ＶＥの上端に当接せしめ
る第１および第２タペットねじ５３Ａ，５３Ｂを螺合す
る第１および第２ボス部５８ａ，５９ａが、排気側ロッ
カシャフト５１の軸線Ｃに沿う方向に並んで排気側ロッ
カアーム５０の先端に配設されるが、各ボス部５８ａ，
５９間は連結壁６０で連結されている。したがって一対
の排気弁ＶＥ，ＶＥを駆動する排気側ロッカアーム５０
の先端側の剛性を充分に高めることができ、しかも連結
壁６０は、排気側ロッカシャフト５１の軸線Ｃすなわち
排気側ロッカアーム５０の揺動軸線と直交する平面内で
相互に直交する第１および第２壁部６０ａ，６０ｂから
成るものであるので充分な連結剛性を保持しつつ連結壁
６０による排気側ロッカアーム５０の重量増大を小さく
抑えることができる。また連結壁６０のうち第２壁部６
０ｂは、排気側ロッカシャフト５１の軸線と平行に延び
るとともに外面を第１および第２ボス部５８ａ，５９ａ
の先端外側面に面一に連ならせるように形成されている
ので、各ボス部５８ａ，５９ａおよび連結壁６０の連結
部への応力集中をなくし、排気側ロッカアーム５０の先
端側剛性を充分に高めつつ耐久性を向上することができ
る。Further, the first and second boss portions 58a and 59a, into which the first and second tappet screws 53A and 53B are brought into contact with the upper ends of the exhaust valves VE and VE, are attached to the axis C of the exhaust side rocker shaft 51. The bosses 58a, 58a,
The 59 are connected by a connecting wall 60. Therefore, the exhaust side rocker arm 50 that drives the pair of exhaust valves VE, VE
Of the exhaust side rocker shaft 51, that is, the connecting wall 60 is sufficiently orthogonal to the swing axis of the exhaust side rocker arm 50. Since it is composed of the two wall portions 60a and 60b, it is possible to suppress the weight increase of the exhaust side rocker arm 50 by the connecting wall 60 while maintaining sufficient connecting rigidity. The second wall portion 6 of the connecting wall 60
0b extends parallel to the axis of the exhaust-side rocker shaft 51 and has an outer surface having the first and second boss portions 58a and 59a.
Since it is formed so as to be flush with the outer side surface of the distal end of the, the stress concentration on the connecting portion of each boss portion 58a, 59a and the connecting wall 60 is eliminated, and the rigidity of the exhaust side rocker arm 50 on the leading end side is sufficiently increased. The durability can be improved while increasing the height.
【００５８】さらにローラ５６を収容せしめるべく排気
側ロッカアーム５０に設けられる開口部６２の一側面
が、連結壁６０における第１壁部６０ａの内面で形成さ
れており、連結壁６０をローラ５６に近接させてローラ
５６の支持剛性も高めることができる。Further, one side surface of the opening 62 provided in the exhaust side rocker arm 50 for accommodating the roller 56 is formed by the inner surface of the first wall portion 60a of the connecting wall 60, and the connecting wall 60 is close to the roller 56. As a result, the supporting rigidity of the roller 56 can be increased.
【００５９】以上、本発明の実施例を説明したが、本発
明は上記実施例に限定されるものではなく、特許請求の
範囲に記載された本発明を逸脱することなく種々の設計
変更を行うことが可能である。Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. It is possible.
【００６０】たとえば本発明を吸気弁の動弁装置に適用
することも可能である。For example, the present invention can be applied to a valve operating device for an intake valve.
【００６１】[0061]
【発明の効果】以上のように請求項１，２の各発明によ
れば、揺動支持部の中央側を薄肉としてロッカアームの
重量増大を回避しつつ、大きな荷重が作用する可能性が
ある揺動支持部の両端部を肉厚としてロッカアームの支
持剛性を高め、耐久性の向上を図ることができる。更に
第１および第２タペットねじ間の距離以上の長さで揺動
支持部がロッカシャフトに支持されることになって、ロ
ッカアームをより安定的に支持することが可能となる。 As described above, according to each of the first and second aspects of the present invention, a large load may act while avoiding an increase in weight of the rocker arm by making the center side of the rocking support portion thin. By making both ends of the dynamic support portion thick, the support rigidity of the rocker arm can be increased and the durability can be improved. Further
Swing with a length greater than the distance between the first and second tappet screws
The supporting part will be supported by the rocker shaft,
It is possible to more stably support the kicker arm.
【００６２】また特に請求項２の発明によれば、揺動支
持部の両端部およびロッカシャフト間にオイルを溜める
ことが可能であるので偏摩耗が生じるのを極力防止する
ことができ、しかも厚肉円筒部の内面に溝が設けられる
ので溝による揺動支持部の剛性低下を避けることがで
き、耐久性を確実に向上することができる。[0062] According particularly to the second aspect of the invention, can be as much as possible to prevent the uneven wear occurs because it is possible to store the oil between the ends and the rocker shaft rocking support, yet thick Since the groove is provided on the inner surface of the meat cylinder portion, it is possible to prevent the rigidity of the rocking support portion from being lowered by the groove, and it is possible to reliably improve the durability.
【００６３】また特に請求項３の発明によれば、各ボス
部間が連結壁で連結されるので、一対の機関弁を駆動す
るロッカアームの先端側の剛性を充分に高めることがで
き、しかもその連結壁は、ロッカシャフトの軸線と直交
する平面内で相互に直交する第１および第２壁部を有す
るので、充分な連結剛性を保持しつつ連結壁による排気
側ロッカアームの重量増大を小さく抑えることができ
る。 Further , according to the invention of claim 3, in particular, each boss
Drives a pair of engine valves because the parts are connected by a connecting wall.
It is possible to sufficiently increase the rigidity of the tip side of the rocker arm.
Moreover, the connecting wall is orthogonal to the rocker shaft axis.
Have first and second walls that are orthogonal to each other in the plane
Therefore, exhaust from the connecting wall while maintaining sufficient connecting rigidity.
The weight of the side rocker arm can be kept small.
It
【００６４】また特に請求項４の発明によれば、前記連
結壁が、外面を前記各ボス部の先端外周面に面一に連な
らせる壁部を有するので、各ボス部および連結壁の連結
部への応力集中をなく し、ロッカアームの先端側剛性を
充分に高めつつ耐久性を向上することができる。 According to the invention of claim 4, in particular,
The connecting wall connects the outer surface flush with the outer peripheral surface of the tip of each boss.
Since there is a wall part that makes it possible to connect each boss part and the connecting wall
To eliminate the concentration of stress on the parts, the front end side rigidity of the rocker arm
The durability can be improved while being sufficiently increased.
【図１】内燃機関の一部縦断面図である。FIG. 1 is a partial vertical cross-sectional view of an internal combustion engine.
【図２】図１の２矢視平面図である。FIG. 2 is a plan view taken along the arrow 2 of FIG.
【図３】排気側ロッカアームの平面図である。FIG. 3 is a plan view of an exhaust side rocker arm.
【図４】図２の４−４線断面図である。4 is a sectional view taken along line 4-4 of FIG.
【図５】図２の５−５線断面図である。5 is a sectional view taken along line 5-5 of FIG.
【図６】図５の６−６線断面図である。6 is a sectional view taken along line 6-6 of FIG.
【図７】図６の７ー７線断面図である。7 is a sectional view taken along line 7-7 of FIG.
１６・・・シリンダヘッド ３４・・・排気側動弁装置 ５０・・・排気側ロッカアーム ５１・・・排気側ロッカシャフト ５３Ａ・・・第１弁当接部としての第１タペットねじ ５３Ｂ・・・第２弁当接部としての第２タペットねじ ５５・・・動弁カム ５６・・・カム当接部としてのローラ ５７・・・揺動支持部 ５７ａ・・・薄肉円筒部 ５７ｂ・・・厚肉円筒部 ５８・・・第１支持壁 ５９・・・第２支持壁 ６８・・・溝 Ｃ・・・排気側ロッカシャフトの軸線 ＶＥ・・・機関弁としての排気弁 16: Cylinder head 34 ... Exhaust valve operating device 50 ... Exhaust rocker arm 51 ... Exhaust side rocker shaft 53A ... First tappet screw as first valve contact portion 53B ... Second tappet screw as second valve contact portion 55 ... Valve cam 56 ... A roller as a cam contact portion 57 ... Swing support 57a ... Thin-walled cylindrical portion 57b ... Thick-walled cylindrical part 58 ... 1st support wall 59 ... Second support wall 68 ... groove C: Axis line of exhaust side rocker shaft VE ... Exhaust valve as an engine valve
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平11−200822（ＪＰ，Ａ) 特開 平３−217610（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) F01L 13/00 F01L 1/18 F01M 1/06 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-11-200822 (JP, A) JP-A-3-217610 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) F01L 13/00 F01L 1/18 F01M 1/06
Claims (4)
る円筒状の揺動支持部（５７）がシリンダヘッド（１
６）に設けられたロッカシャフト（５１）で揺動可能に
支承され、一対の機関弁（ＶＥ）の上端に個別に当接可
能とした第１および第２タペットねじ（５３Ａ，５３
Ｂ）がロッカアーム（５０）の先端に設けられ、動弁カ
ム（５５）に接触するカム当接部（５６）が前記揺動支
持部（５７）および前記各タペットねじ（５３Ａ，５３
Ｂ）間の中間部でロッカアーム（５０）に設けられる内
燃機関の動弁装置において、 前記揺動支持部（５７）は、前記ロッカシャフト（５
１）を囲繞する薄肉円筒部（５７ａ）の軸方向両端に、
前記ロッカシャフト（５１）を囲繞する円筒状にして前
記薄肉円筒部（５７ａ）よりも肉厚の厚肉円筒部（５７
ｂ）がそれぞれ一体に連設されて成り、 その両厚肉円筒部（５７ｂ）から第１および第２支持壁
（５８，５９）が、前記ロッカシャフト（５１）の軸線
に直交する平面に沿うようにしてそれぞれ延設されてお
り、 その第１および第２支持壁（５８，５９）の先端には、
外周面を横断面円弧状とした第１および第２ボス部（５
８ａ，５９ａ）がそれぞれ一体に形成されると共に、そ
の第１および第２ボス部（５８ａ，５９ａ）には、前記
第１および第２タペットねじ（５３Ａ，５３Ｂ）を螺合
せしめるねじ孔（６１Ａ，６１Ｂ）がそれぞれ設けら
れ、 前記揺動支持部（５７）は、前記ロッカシャフト（５
１）の軸線に沿う方向で前記第１および第２タペットね
じ（５３Ａ，５３Ｂ）の中心間の距離よりも長く形成さ
れている ことを特徴とする、内燃機関の動弁装置。1. A cylindrical rocking support portion (57) provided at a base end of a rocker arm (50) includes a cylinder head (1).
First and second tappet screws (53A, 53) that are rockably supported by a rocker shaft (51) provided in 6) and can individually contact the upper ends of a pair of engine valves (VE).
B) is provided at the tip of the rocker arm (50), and the cam contact portion (56) that contacts the valve operating cam (55) has the swing support portion (57) and the tappet screws (53A, 53).
In the valve operating system of the internal combustion engine, which is provided on the rocker arm (50) at an intermediate portion between B), the rocking support portion (57) includes the rocker shaft (5).
1) on both axial ends of the thin-walled cylindrical portion (57a) surrounding
A thick-walled cylindrical portion (57) having a cylindrical shape surrounding the rocker shaft (51) and having a thickness larger than that of the thin-walled cylindrical portion (57a).
b) is Ri formed is integrally connected to each first and second support walls from the both thick cylindrical portion (57 b)
(58, 59) is the axis of the rocker shaft (51)
Are extended along the plane orthogonal to
Ri, the tip of the first and second support walls (58, 59),
The first and second boss portions (5
8a, 59a) are integrally formed, respectively.
In the first and second boss portions (58a, 59a) of
Screw the first and second tappet screws (53A, 53B)
Each screw hole (61A, 61B)
The rocking support portion (57) is connected to the rocker shaft (5).
The first and second tappets in a direction along the axis of 1)
(53A, 53B) is formed longer than the distance between the centers
It is characterized in that is, a valve gear of an internal combustion engine.
る円筒状の揺動支持部（５７）がシリンダヘッド（１
６）に設けられたロッカシャフト（５１）で揺動可能に
支承され、一対の機関弁（ＶＥ）の上端に個別に当接可
能とした第１および第２タペットねじ（５３Ａ，５３
Ｂ）がロッカアーム（５０）の先端に設けられ、動弁カ
ム（５５）に接触するカム当接部（５６）が前記揺動支
持部（５７）および前記各タペットねじ（５３Ａ，５３
Ｂ）間の中間部でロッカアーム（５０）に設けられる内
燃機関の動弁装置において、 前記揺動支持部（５７）は、前記ロッカシャフト（５
１）を囲繞する薄肉円筒部（５７ａ）の軸方向両端に、
前記ロッカシャフト（５１）を囲繞する円筒状にして前
記薄肉円筒部（５７ａ）よりも肉厚の厚肉円筒部（５７
ｂ）がそれぞれ一体に連設されて成ると共に、その両厚
肉円筒部（５７ｂ）の内面に、ロッカシャフト（５１）
の外面との間にオイルを溜め得る溝（６８）がそれぞれ
設けられ、 前記両厚肉円筒部（５７ｂ）から第１および第２支持壁
（５８，５９）が、前記ロッカシャフト（５１）の軸線
に直交する平面に沿うようにしてそれぞれ延設されてお
り、 その第１および第２支持壁（５８，５９）の先端には、
外周面を横断面円弧状とした第１および第２ボス部（５
８ａ，５９ａ）がそれぞれ一体に形成されると共に、そ
の第１および第２ボス部（５８ａ，５９ａ）には、前記
第１および第２タペットねじ（５３Ａ，５３Ｂ）を螺合
せしめるねじ孔（６１Ａ，６１Ｂ）がそれぞれ設けら
れ、 前記揺動支持部（５７）は、前記ロッカシャフト（５
１）の軸線に沿う方向で前記第１および第２タペットね
じ（５３Ａ，５３Ｂ）の中心間の距離よりも長く形成さ
れている ことを特徴とする、内燃機関の動弁装置。2. A cylindrical rocking support portion (57) provided at a base end of a rocker arm (50) has a cylinder head (1).
First and second tappet screws (53A, 53) that are rockably supported by a rocker shaft (51) provided in 6) and can individually contact the upper ends of a pair of engine valves (VE).
B) is provided at the tip of the rocker arm (50), and the cam contact portion (56) that contacts the valve operating cam (55) has the swing support portion (57) and the tappet screws (53A, 53).
In the valve operating system of the internal combustion engine, which is provided on the rocker arm (50) at an intermediate portion between B), the rocking support portion (57) includes the rocker shaft (5).
1) on both axial ends of the thin-walled cylindrical portion (57a) surrounding
A thick-walled cylindrical portion (57) having a cylindrical shape surrounding the rocker shaft (51) and having a thickness larger than that of the thin-walled cylindrical portion (57a).
b), which are integrally connected to each Rutotomoni, on the inner surface of both thick-walled cylindrical portion (57 b), the rocker shaft (51)
Of the outer surface grooves may sump oil (68) are respectively provided between the first and second support walls from said both thick-walled cylindrical portion (57 b)
(58, 59) is the axis of the rocker shaft (51)
Are extended along the plane orthogonal to
Ri, the tip of the first and second support walls (58, 59),
The first and second boss portions (5
8a, 59a) are integrally formed, respectively.
In the first and second boss portions (58a, 59a) of
Screw the first and second tappet screws (53A, 53B)
Each screw hole (61A, 61B)
The rocking support portion (57) is connected to the rocker shaft (5).
The first and second tappets in a direction along the axis of 1)
(53A, 53B) is formed longer than the distance between the centers
It is characterized in that is, a valve gear of an internal combustion engine.
前記ロッカシャフト（５１）の軸線（Ｃ）に直交する平A flat plate orthogonal to the axis (C) of the rocker shaft (51)
面内で相互に直交する第１および第２壁部（６０ａ，６First and second wall portions (60a, 6) orthogonal to each other in the plane
０ｂ）を有する連結壁（６０）で連結されることを特徴0b) are connected by a connecting wall (60)
とする、請求項１又は２に記載の内燃機関の動弁装置。The valve operating system for an internal combustion engine according to claim 1 or 2.
ス部（５８ａ，５９ａ）の先端外周面に面一に連ならせBe flush with the outer peripheral surface of the tip of the sleeve portion (58a, 59a).
る壁部（６０ｂ）を有することを特徴とする、請求項３4. A wall portion (60b) having a wall.
に記載の内燃機関の動弁装置。A valve train for an internal combustion engine as set forth in.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP37083699A JP3535430B2 (en) | 1999-12-27 | 1999-12-27 | Valve train for internal combustion engine |
| TW089126921A TW475961B (en) | 1999-12-27 | 2000-12-15 | Valve operating system in internal combustion engine |
| AU72464/00A AU760535B2 (en) | 1999-12-27 | 2000-12-21 | Valve operating system in internal combustion engine |
| EP00128135A EP1113149B1 (en) | 1999-12-27 | 2000-12-22 | Valve operating system in internal combustion engine |
| DE60007503T DE60007503T2 (en) | 1999-12-27 | 2000-12-22 | Valve control device for an internal combustion engine |
| CA002329581A CA2329581C (en) | 1999-12-27 | 2000-12-22 | Valve operating system in internal combustion engine |
| US09/745,991 US6463899B2 (en) | 1999-12-27 | 2000-12-26 | Valve operating system in internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP37083699A JP3535430B2 (en) | 1999-12-27 | 1999-12-27 | Valve train for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001182515A JP2001182515A (en) | 2001-07-06 |
| JP3535430B2 true JP3535430B2 (en) | 2004-06-07 |
Family
ID=18497686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP37083699A Expired - Fee Related JP3535430B2 (en) | 1999-12-27 | 1999-12-27 | Valve train for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3535430B2 (en) |
-
1999
- 1999-12-27 JP JP37083699A patent/JP3535430B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001182515A (en) | 2001-07-06 |
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