JPH0518215A - Ship shaped rocker arm type valve system of overhead valve engine - Google Patents
Ship shaped rocker arm type valve system of overhead valve engineInfo
- Publication number
- JPH0518215A JPH0518215A JP19854291A JP19854291A JPH0518215A JP H0518215 A JPH0518215 A JP H0518215A JP 19854291 A JP19854291 A JP 19854291A JP 19854291 A JP19854291 A JP 19854291A JP H0518215 A JPH0518215 A JP H0518215A
- Authority
- JP
- Japan
- Prior art keywords
- rocker arm
- lubricating oil
- chamber
- storage chamber
- pressing member
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2810/00—Arrangements solving specific problems in relation with valve gears
- F01L2810/02—Lubrication
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、頭上弁エンジンの舟形
ロッカアーム型動弁装置に関し、バルブクリアランスの
吸収構造を簡略にして動弁装置の騒音を安価に低減でき
るものを提供する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boat-type rocker arm type valve operating device for an overhead valve engine, and provides a valve operating device that simplifies the structure for absorbing valve clearance and reduces the noise of the valve operating device at low cost.
【0002】[0002]
【従来の技術】最近、エンジンの生産コストを低減する
ため、ロッカアームを板金プレス製の舟形に形成して安
価に製造する場合が少なくない。本発明は、この舟形ロ
ッカアームを組み込んだ頭上弁エンジンの動弁装置を発
明の対象とし、その基本構造は、図1又は図8に示すよ
うに、頭上弁エンジンEのロッカアーム室2にスタッド
部材3を取り付け、スタッド部材3にロッカアーム押え
部材4をシリンダヘッド1に接近・離間する上下方向P
に沿って進退自在に嵌挿支持し、ロッカアーム押え部材
4に部分球面状の受け止め面5を形成し、ロッカアーム
6を板金で断面コ字状の舟形に加工し、舟形ロッカアー
ム6に部分球面状の押し当て面7を凹設し、当該押し当
て面7をロッカアーム押え部材4の受け止め面5にシリ
ンダヘッド1に臨む下側から面接触させて、舟形ロッカ
アーム6をロッカアーム押え部材4に揺動自在に支持し
た形式のものである。2. Description of the Related Art Recently, in order to reduce the production cost of an engine, it is not uncommon for the rocker arm to be manufactured at low cost by forming it into a boat shape made of a sheet metal press. The present invention is directed to a valve operating system for an overhead valve engine incorporating the boat-shaped rocker arm, and its basic structure is, as shown in FIG. 1 or 8, a stud member 3 in a rocker arm chamber 2 of an overhead valve engine E. , And the rocker arm pressing member 4 approaches and separates from the cylinder head 1 on the stud member 3 in the vertical direction P.
The rocker arm holding member 4 is formed with a partially spherical receiving surface 5, and the rocker arm 6 is machined into a boat shape with a U-shaped cross section by using a metal plate, and the boat-shaped rocker arm 6 is partially spherical. The pressing surface 7 is provided as a recess, and the pressing surface 7 is brought into surface contact with the receiving surface 5 of the rocker arm pressing member 4 from the lower side facing the cylinder head 1 so that the boat-shaped rocker arm 6 can swing on the rocker arm pressing member 4. It is a supported form.
【0003】上記舟形ロッカアームを組み付けた従来の
動弁装置としては、図8に示すように、縦型頭上弁エン
ジンEの舟形ロッカアーム6を揺動するプッシュロッド
24を、タペット(図示省略)を介して動弁カム軸に連動
し、当該タペットにバルブ・ラッシュ・アジャスタを組み
込んでバルブクリアランスを吸収し、動弁装置の騒音を
低減するようにしたものがある。As a conventional valve operating system in which the boat-shaped rocker arm is assembled, as shown in FIG. 8, a push rod 24 for swinging the boat-shaped rocker arm 6 of the vertical overhead valve engine E is provided via a tappet (not shown). The valve lash adjuster is incorporated into the tappet to absorb the valve clearance and reduce the noise of the valve operating device.
【0004】[0004]
【発明が解決しようとする課題】しかしながら、上記バ
ルブ・ラッシュ・アジャスタは、筒状のタペット本体と、
タペット本体に嵌入するプランジャと、これらの部材間
に介装したプランジャ・スプリング及びチェック・ボール
などから構成されるので、構造が複雑になり、生産コス
トも高くなる。本発明は、簡便且つ安価にバルブクリア
ランスをなくすことを技術的課題とする。However, the valve lash adjuster described above includes a tubular tappet body,
Since the plunger is fitted into the tappet body, and the plunger spring and the check ball are interposed between these members, the structure becomes complicated and the production cost becomes high. An object of the present invention is to eliminate the valve clearance simply and inexpensively.
【0005】[0005]
【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、実施例を示す図面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舟形
ロッカアーム型動弁装置において、上記スタッド部材3
にロッカアーム押え部材4を弾圧バネ8を介して支持
し、弾圧バネ8でロッカアーム押え部材4をスタッド部
材3に対してシリンダヘッド1に近付く下向きBに弾圧
付勢し、スタッド部材3に潤滑油導入路10と逆止弁室
12を設け、潤滑油導入路10の出口11を逆止弁室1
2に連通し、スタッド部材3とロッカアーム押え部材4
の側との境界部位13に潤滑油貯留室14を設け、潤滑
油貯留室14を逆止弁室12に連通して、潤滑油導入路
10からの潤滑油を逆止弁室12を介して潤滑油貯留室
14に案内するとともに、潤滑油貯留室14からの潤滑
油を潤滑油導入路10に逆止弁室12の弁体17で逆流
入不能に構成し、ロッカアーム押え部材4とスタッド部
材3側との間の嵌挿間隙18を潤滑油貯留室14からロ
ッカアーム室2への潤滑油漏出路16として形成し、ロ
ッカアーム6がシリンダヘッド1から離れる上向きAの
力を受けると、ロッカアーム押え部材4がスタッド部材
3に対して上向きAに移動し、潤滑油貯留室14が圧縮
されて逆止弁室12の逆止弁体17が潤滑油導入路10
の出口11を閉ざし、潤滑油貯留室14から潤滑油漏出
路16を介して潤滑油をロッカアーム室2に漏出させ
て、ロッカアーム6をスタッド部材3に沿って上向きA
に移動可能に構成したことを特徴とするものである。上
記潤滑油導入路10は、エンジンEの強制潤滑装置から
導いた潤滑油吐出路、或は、ロッカアーム室2に充満す
る潤滑油の飛沫ミストを受け止めて導く通路の両方を含
む。Means for achieving the above object will be described below with reference to the drawings illustrating an embodiment. That is, the present invention 1 is the boat type rocker arm type valve operating device for an overhead valve engine of the basic structure, wherein the stud member 3 is used.
The rocker arm pressing member 4 is supported by the elastic spring 8 and the elastic spring 8 elastically presses the rocker arm pressing member 4 downwardly B toward the cylinder head 1 toward the stud member 3 to introduce lubricating oil into the stud member 3. The passage 10 and the check valve chamber 12 are provided, and the outlet 11 of the lubricating oil introduction passage 10 is connected to the check valve chamber 1
2, the stud member 3 and the rocker arm pressing member 4
The lubricating oil storage chamber 14 is provided at the boundary portion 13 with the side of the, the lubricating oil storage chamber 14 is communicated with the check valve chamber 12, and the lubricating oil from the lubricating oil introduction passage 10 is passed through the check valve chamber 12. The rocker arm pressing member 4 and the stud member are configured such that the lubricating oil from the lubricating oil storage chamber 14 is guided to the lubricating oil storage chamber 14 and the valve body 17 of the check valve chamber 12 cannot reversely flow the lubricating oil from the lubricating oil storage chamber 14. When the rocker arm 6 receives a force of upward A that separates from the cylinder head 1, a rocker arm pressing member is formed with a fitting insertion gap 18 between the rocker arm 6 and the third side as a lubricant oil leak passage 16 from the lubricant oil storage chamber 14 to the rocker arm chamber 2. 4 moves upward with respect to the stud member 3, the lubricating oil storage chamber 14 is compressed, and the check valve body 17 of the check valve chamber 12 moves to the lubricating oil introducing passage 10.
The outlet 11 is closed, the lubricating oil is leaked from the lubricating oil storage chamber 14 to the rocker arm chamber 2 through the lubricating oil leak passage 16, and the rocker arm 6 is moved upward along the stud member 3.
It is characterized in that it can be moved to. The lubricating oil introduction passage 10 includes both a lubricating oil discharge passage led from the forced lubrication device of the engine E or a passage for receiving and guiding the spray mist of the lubricating oil filling the rocker arm chamber 2.
【0006】[0006]
【作用】(1)エンジンEの始動時などの低温時には、弾
圧バネ8の弾圧力によりロッカアーム押え部材4がスタ
ッド部材3に沿って下向きBに押圧され、ロッカアーム
押え部材4に下から接触するロッカアーム6は同じく下
向きBに押されて吸・排気弁に接当し、バルブクリアラ
ンスを吸収する。この場合、潤滑油貯留室14は膨張す
るので、潤滑油導入路10からの潤滑油が逆止弁室12
を介して潤滑油貯留室14に流入する。(1) At a low temperature such as when the engine E is started, the rocker arm pressing member 4 is pressed downward B along the stud member 3 by the elastic force of the elastic spring 8, and the rocker arm pressing member 4 comes into contact with the rocker arm pressing member 4 from below. Similarly, 6 is pressed downward B to contact the intake / exhaust valve and absorb the valve clearance. In this case, the lubricating oil storage chamber 14 expands, so that the lubricating oil from the lubricating oil introducing passage 10 will be discharged from the check valve chamber 12
Through the oil into the lubricating oil storage chamber 14.
【0007】(2)エンジンEの温度が上昇して吸・排気弁
やプッシュロッドが熱膨張すると、ロッカアーム6が上
向きAの力を受け、ロッカアーム押え部材4をスタッド
部材3に対して上向きAに押す。このため、潤滑油貯留
室14が圧縮されて逆止弁室12の逆止弁体17が潤滑
油導入路10の出口11を閉ざし、潤滑油貯留室14の
潤滑油は潤滑油漏出路16からロッカアーム室2に漏出
するので、ロッカアーム6はスタッド部材3に沿って上
向きAに逃げる。従って、ロッカアーム6はバルブクリ
アランスを吸収しながら揺動するので、吸・排気行程以
外で吸・排気弁が開弁することはない。尚、エンジンE
が冷えて吸・排気弁が収縮し、ロッカアーム6が下降す
ると、前記(1)のように潤滑油が潤滑油導入路10から
貯留室14に流れ込むので、上記潤滑油漏出路16から
の漏出分を補填できる。(2) When the temperature of the engine E rises and the intake / exhaust valve and the push rod thermally expand, the rocker arm 6 receives a force of upward A, and the rocker arm pressing member 4 moves upward A with respect to the stud member 3. Push. Therefore, the lubricating oil storage chamber 14 is compressed, the check valve body 17 of the check valve chamber 12 closes the outlet 11 of the lubricating oil introduction passage 10, and the lubricating oil of the lubricating oil storage chamber 14 is discharged from the lubricating oil leakage passage 16. Since it leaks into the rocker arm chamber 2, the rocker arm 6 escapes upward A along the stud member 3. Therefore, the rocker arm 6 swings while absorbing the valve clearance, so that the intake / exhaust valve does not open except during the intake / exhaust stroke. The engine E
When the intake / exhaust valve contracts and the rocker arm 6 descends, the lubricating oil flows from the lubricating oil introduction passage 10 into the storage chamber 14 as described in (1) above. Can be compensated.
【0008】[0008]
【発明の効果】ロッカアームのロッカアーム押え部材と
スタッド部材との間に、潤滑油貯留室、逆止弁室や弾圧
バネなどから成る調整機構を組み込んでいわばバルブ・
ラッシュ・アジャスタにするので、ロッカアーム押え部
材及びスタッド部材などの既存の部材を利用するうえ
(特に、両部材の嵌挿間隙などを有効に利用するうえ)、
ロッカアーム押え部材にプランジャの機能を兼ねさせる
ので、前記従来技術のようにタペットに組み込んだアジ
ャスタに比べて、バルブクリアランスの吸収構造を簡略
にして安価に製造できる。EFFECTS OF THE INVENTION Between the rocker arm pressing member and the stud member of the rocker arm, an adjusting mechanism including a lubricating oil storage chamber, a check valve chamber, an elastic spring, etc. is incorporated, so to speak, a valve.
Since it is a lash adjuster, it is possible to use existing members such as rocker arm pressing members and stud members.
(In particular, to effectively use the fitting gap of both members)
Since the rocker arm pressing member also has the function of the plunger, the structure for absorbing the valve clearance can be simplified and the manufacturing cost can be reduced as compared with the adjuster incorporated in the tappet as in the above-mentioned conventional technique.
【0009】[0009]
【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ロッカ
アーム室内の動弁装置の要部縦断面図であって、縦型頭
上弁エンジンEのシリンダヘッド1の上方にロッカアー
ムカバーで覆われたロッカアーム室2を形成する。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a main part of a valve train in a rocker arm chamber of a vertical overhead valve engine showing a first embodiment, and a rocker arm covered with a rocker arm cover above a cylinder head 1 of a vertical overhead valve engine E. The chamber 2 is formed.
【0010】上記シリンダヘッド1に頭なし型のスタッ
ドボルト3aを締結ナット19で締め付け、立設したス
タッドボルト3aに筒状のロッカアーム押え部材4を上
下方向Pに進退自在に嵌挿支持し、ロッカアーム押え部
材4の下部に部分球面状の受け止め面5を形成する。ロ
ッカアーム6を板金プレス加工で舟形に製造し、当該ロ
ッカアーム6の前後断面を上方が開口したコ字状に形成
し、ロッカアーム6の左右の中程に部分球面状の押し当
て面7を凹設し、当該押し当て面7に嵌挿口21を開け
る。前記スタッドボルト3aにロッカアーム6を嵌挿
し、ロッカアーム6の押し当て面7をロッカアーム押え
部材4の受け止め面5に下側から面接触させ、スタッド
キャップ22をロッカアーム押え部材4に相対摺動可能
に被せ付け、ロックナット23で当該押え部材4をスタ
ッドボルト3aから抜け止め不能に固定する。上記スタ
ッドボルト3aに揺動自在に支持された舟形ロッカアー
ム6の入力部6aをプッシュロッド24に上から接当さ
せ、プッシュロッド24をタペットを介してエンジンE
の動弁カム軸に連動するとともに、ロッカアーム6の出
力部6bを開閉弁25のステムエンドに上から接当させ
る。当該開閉弁25は吸気弁と排気弁の両方を意味す
る。A headless stud bolt 3a is fastened to the cylinder head 1 with a fastening nut 19, and a cylindrical rocker arm pressing member 4 is inserted and supported in the upright stud bolt 3a so as to move forward and backward in the vertical direction P. A partially spherical receiving surface 5 is formed on the lower portion of the pressing member 4. The rocker arm 6 is manufactured into a boat shape by sheet metal stamping, the front and rear cross-section of the rocker arm 6 is formed in a U shape with an upward opening, and a partially spherical pressing surface 7 is provided in the middle of the rocker arm 6 on the left and right sides. The insertion opening 21 is opened in the pressing surface 7. The rocker arm 6 is inserted into the stud bolt 3a, the pressing surface 7 of the rocker arm 6 is brought into surface contact with the receiving surface 5 of the rocker arm pressing member 4 from below, and the stud cap 22 is relatively slidably covered on the rocker arm pressing member 4. Then, the pressing member 4 is fixed by the lock nut 23 so that the pressing member 4 cannot be removed from the stud bolt 3a. The input portion 6a of the boat-shaped rocker arm 6 swingably supported by the stud bolt 3a is brought into contact with the push rod 24 from above, and the push rod 24 is passed through the tappet to drive the engine E.
The output portion 6b of the rocker arm 6 is brought into contact with the stem end of the opening / closing valve 25 from above while being linked to the valve operating cam shaft. The open / close valve 25 means both an intake valve and an exhaust valve.
【0011】前記ロックナット23の上部に潤滑油受け
止め凹部26をロッカアーム室2に臨ませて形成し、ス
タッドボルト3aの頭部27に逆止弁室12を設け、ロ
ックナット23内に介装したリテーナ部材28に縦向き
に潤滑油導入路10を開け、潤滑油導入路10の入口を
上記受け止め凹部26に、その出口11を逆止弁室12
に各々連通する。ロッカアーム室2内にはエンジンEの
強制潤滑装置の潤滑油路で供給された潤滑油が充満して
おり、ロックナット23の潤滑油受け止め凹部26内に
容易に受け止められる。上記逆止弁室12にボール弁体
17を収容し、付勢バネ29でボール弁体17を潤滑油
導入路10の出口11(即ち、弁口30)に接当付勢し
て、逆止弁室12内の油圧が高くなると弁口30を閉ざ
すようにする。但し、ボール弁体17を潤滑油より比重
の小さいプラスティックなどで製造すると、付勢バネ2
9を省略できる。A lubricating oil receiving recess 26 is formed in the upper part of the lock nut 23 so as to face the rocker arm chamber 2, and the check valve chamber 12 is provided in the head 27 of the stud bolt 3a and is inserted in the lock nut 23. The lubricating oil introducing passage 10 is opened vertically in the retainer member 28, the inlet of the lubricating oil introducing passage 10 is set in the receiving recess 26, and the outlet 11 is formed in the check valve chamber 12.
Communicate with each. The rocker arm chamber 2 is filled with the lubricating oil supplied through the lubricating oil passage of the forced lubrication device of the engine E, and is easily received in the lubricating oil receiving recess 26 of the lock nut 23. The ball valve body 17 is housed in the check valve chamber 12, and the biasing spring 29 biases the ball valve body 17 against the outlet 11 (that is, the valve opening 30) of the lubricating oil introducing passage 10 to urge the check valve chamber 12 to perform a check. When the hydraulic pressure in the valve chamber 12 becomes high, the valve opening 30 is closed. However, when the ball valve body 17 is manufactured from plastic or the like having a smaller specific gravity than the lubricating oil, the urging spring 2
9 can be omitted.
【0012】上記ロッカアーム押え部材4とこれに外嵌
されるスタッドキャップ22との間の境界部位13に潤
滑油貯留室14を形成し、潤滑油貯留室14をL字状の
潤滑油案内路15で上記逆止弁室12に連通して、潤滑
油導入路10からの潤滑油を逆止弁室12及び潤滑油案
内路15を介して潤滑油貯留室14に案内するととも
に、潤滑油貯留室14からの潤滑油を潤滑油導入路10
に逆止弁室12のボール弁体17で逆流入不能に構成す
る。また、上記スタッドキャップ22がロッカアーム押
え部材4に嵌合する嵌挿間隙18を潤滑油貯留室14か
らロッカアーム室2への潤滑油漏出路16として形成し
て、潤滑油貯留室14の油圧が高まると、潤滑油貯留室
14の潤滑油が漏出路16から舟形ロッカアーム6に漏
れ出るように構成する。また、上記潤滑油貯留室14内
に弾圧バネ8を収容し、スタッドキャップ22の上壁と
ロッカアーム押え部材4の上端壁とに亘って懸架する。
この場合、スタッドキャップ22はロックナット23で
スタッドボルト3aに固定されるので、弾圧バネ8の作
用でロッカアーム押え部材4はスタッドボルト3aに対
してシリンダヘッド1に近付く下向きBに弾圧付勢さ
れ、ロッカアーム6のバルブクリアランスを常時吸収さ
れる。尚、符号40はスタッドキャップ22の貯留室内
壁に設けた摺動ストッパである。A lubricating oil storage chamber 14 is formed at a boundary portion 13 between the rocker arm pressing member 4 and a stud cap 22 fitted on the rocker arm pressing member 4, and the lubricating oil storage chamber 14 is formed into an L-shaped lubricating oil guide passage 15. To communicate with the check valve chamber 12 to guide the lubricating oil from the lubricating oil introduction passage 10 to the lubricating oil storage chamber 14 via the check valve chamber 12 and the lubricating oil guide passage 15, and at the same time, to the lubricating oil storage chamber. The lubricating oil from 14 is fed to the lubricating oil introducing passage 10
In addition, the ball valve element 17 of the check valve chamber 12 is configured to prevent reverse inflow. Further, the stud cap 22 forms the fitting insertion gap 18 into which the rocker arm pressing member 4 is fitted as the lubricating oil leak passage 16 from the lubricating oil storage chamber 14 to the rocker arm chamber 2 so that the hydraulic pressure of the lubricating oil storage chamber 14 is increased. Then, the lubricating oil in the lubricating oil storage chamber 14 is configured to leak from the leak passage 16 to the boat-shaped rocker arm 6. Further, the elastic pressure spring 8 is housed in the lubricating oil storage chamber 14 and is suspended over the upper wall of the stud cap 22 and the upper end wall of the rocker arm pressing member 4.
In this case, since the stud cap 22 is fixed to the stud bolt 3a by the lock nut 23, the rocker arm pressing member 4 is elastically biased downward B approaching the cylinder head 1 with respect to the stud bolt 3a by the action of the elastic spring 8. The valve clearance of the rocker arm 6 is always absorbed. Reference numeral 40 is a sliding stopper provided on the inner wall of the storage chamber of the stud cap 22.
【0013】そこで、本実施例1の動弁装置の機能を述
べる。 (1)エンジンEの始動時などの低温時には、弾圧バネ8
の弾圧力によりロッカアーム押え部材4がスタッドボル
ト3aに沿って下向きBに押圧されるので、ロッカアー
ム押え部材4に下から接触するロッカアーム6は同じく
下向きBに押されて吸・排気弁25に接当し、バルブク
リアランスは吸収される。このとき、ロッカアーム6の
下降で潤滑油貯留室14は膨張して減圧されるので、潤
滑油受け止め凹部26の潤滑油は、潤滑油導入路10→
逆止弁室12→潤滑油案内路15を経て潤滑油貯留室1
4に流入する。Therefore, the function of the valve train of the first embodiment will be described. (1) At the time of low temperature such as when starting the engine E, the elastic spring 8
Since the rocker arm pressing member 4 is pressed downward B along the stud bolt 3a by the elastic force of, the rocker arm 6 contacting the rocker arm pressing member 4 from below is also pressed downward B and contacts the intake / exhaust valve 25. However, the valve clearance is absorbed. At this time, as the rocker arm 6 descends, the lubricating oil storage chamber 14 expands and is depressurized.
Check valve chamber 12 → lubricating oil storage chamber 1 via lubricating oil guide passage 15
Inflow to 4.
【0014】(2)エンジンEの温度が上昇して吸・排気弁
25やプッシュロッドが熱膨張すると、ロッカアーム6
が上向きAの力を受け、ロッカアーム押え部材4をスタ
ッドボルト3aに対して上昇させる。このため、潤滑油
貯留室14が圧縮され、潤滑油案内路15から逆止弁室
12に伝わった油圧によりボール弁体17は潤滑油導入
路10の出口11を閉ざすので、案内路15への逃げ道
を失った貯留室14内の潤滑油は、潤滑油漏出路16か
ら舟形ロッカアーム6に漏れ出す。従って、ロッカアー
ム6はバルブクリアランスを吸収しながらスタッドボル
ト3aに沿って上向きAに逃げ、吸・排気行程以外で気
吸・排気弁25が開弁することはない。尚、エンジンE
の冷却で吸・排気弁25が収縮してロッカアーム6が下
降すると、前記(1)のように潤滑油が潤滑油導入路10
から貯留室14に流れ込んで、上記潤滑油漏出路16か
らの漏出分を補填できる。(2) When the temperature of the engine E rises and the intake / exhaust valve 25 and the push rod thermally expand, the rocker arm 6
Receives an upward force A and raises the rocker arm pressing member 4 with respect to the stud bolt 3a. Therefore, the lubricating oil storage chamber 14 is compressed, and the ball valve body 17 closes the outlet 11 of the lubricating oil introducing passage 10 by the hydraulic pressure transmitted from the lubricating oil guide passage 15 to the check valve chamber 12. The lubricating oil in the storage chamber 14 that has lost the escape path leaks from the lubricating oil leak passage 16 to the boat-shaped rocker arm 6. Therefore, the rocker arm 6 escapes upward A along the stud bolt 3a while absorbing the valve clearance, and the air intake / exhaust valve 25 does not open except during the intake / exhaust stroke. The engine E
When the intake / exhaust valve 25 contracts and the rocker arm 6 descends due to cooling, the lubricating oil is introduced into the lubricating oil introducing passage 10 as described in (1) above.
It is possible to make up for the leakage from the lubricating oil leakage passage 16 by flowing into the storage chamber 14 from the above.
【0015】図2及び図3は本発明の実施例2を示し、
前記実施例1を基本構造とした変形例である。即ち、エ
ンジンEの強制潤滑装置32の潤滑油路31をスタッド
ボルト3aに貫設し、当該潤滑油路31を前記実施例1
の潤滑油導入路10として構成したものである。即ち、
潤滑油導入路10→逆止弁室12→潤滑油案内路15→
潤滑油貯留室14に潤滑油を供給可能にする基本的な点
で本実施例2は実施例1と同様であるが、ロッカアーム
室2に充満する潤滑油ミストを導入路10から取り入れ
ようとする実施例1に対して、本実施例2は強制潤滑装
置32の吐出潤滑油を貯留室14に取り入れる点で異な
る。2 and 3 show a second embodiment of the present invention,
It is a modified example of the basic structure of the first embodiment. That is, the lubrication oil passage 31 of the forced lubrication device 32 of the engine E is provided through the stud bolt 3a, and the lubrication oil passage 31 is formed in the first embodiment.
It is configured as the lubricating oil introduction passage 10. That is,
Lubricating oil introduction path 10 → Check valve chamber 12 → Lubricating oil guide path 15 →
The second embodiment is similar to the first embodiment in that the lubricating oil can be supplied to the lubricating oil storage chamber 14, but the lubricating oil mist filling the rocker arm chamber 2 is introduced from the introduction path 10. The second embodiment is different from the first embodiment in that the lubricating oil discharged from the forced lubrication device 32 is taken into the storage chamber 14.
【0016】本実施例2では、スタッドキャップ22と
ロックナット23に長尺状のロッカアームガイド33を
介装し、ロッカアーム6に開けたガイド穴34にガイド
33のアーム35を嵌入して、ロッカアーム6をスタッ
ドボルト3aを中心にして回転振れ防止可能に構成して
ある。上記ガイドアーム35はロッカアーム押え部材4
の球面部を中心にした同心半径Rに沿って円弧状に形成
されて、ロッカアーム6の揺動軌跡に合うように構成さ
れる。In the second embodiment, a long rocker arm guide 33 is interposed between the stud cap 22 and the lock nut 23, and the arm 35 of the guide 33 is fitted into the guide hole 34 formed in the rocker arm 6 to form the rocker arm 6. Is configured to prevent rotational runout around the stud bolt 3a. The guide arm 35 is a rocker arm pressing member 4
It is formed in an arc shape along a concentric radius R centered on the spherical surface of the rocker arm 6 and is configured to fit the rocking locus of the rocker arm 6.
【0017】尚、図6及び図7は、上記実施例2とは別
途に、舟形ロッカアーム6の回転振れを防止する変形例
を示す。即ち、舟形ロッカアーム6を断面コ字状で下方
が開放したスカート形状にプレスし、ロッカアーム6の
前部に矩形・単曲面状の弁当て36を、その後部に半球
面状のロッド受け37を各々凹設し、ロッカアーム6の
両脇のスカート部37間に開閉弁25及びプッシュロッ
ド24を嵌入して、ロッカアーム6を回転振れ防止可能
に構成しても差し支えない。6 and 7 show a modified example for preventing the rotational runout of the boat-shaped rocker arm 6 separately from the second embodiment. That is, the boat-shaped rocker arm 6 is pressed into a skirt shape with a U-shaped cross section and an open bottom, and a rectangular / single-curved valve pad 36 is provided at the front of the rocker arm 6 and a hemispherical rod receiver 37 is provided at the rear thereof. There is no problem even if the rocker arm 6 is provided with a recess and the open / close valve 25 and the push rod 24 are fitted between the skirt portions 37 on both sides of the rocker arm 6 so that the rocker arm 6 can be prevented from swinging.
【0018】図4は本発明の実施例3を示し、前記実施
例2を基本構造としながら、スタッドキャップ22を頭
付きのスタッドボルト3aで抜け止め不能に構成したも
のである。即ち、エンジンEの強制潤滑装置の潤滑油路
31を潤滑油導入路10として、潤滑油貯留室14に潤
滑油を供給可能にした点で本実施例3は実施例2と同様
であるが、頭なしのスタッドボルト3aにロックナット
23を締結した実施例2に対して、本実施例3は頭付き
スタッドボルト3aの使用でロックナットを省略した点
が異なる。FIG. 4 shows a third embodiment of the present invention, which has the basic structure of the second embodiment, but is structured such that the stud cap 22 cannot be prevented from coming off with a stud bolt 3a having a head. That is, the third embodiment is similar to the second embodiment in that the lubricating oil passage 31 of the forced lubrication device of the engine E is used as the lubricating oil introduction passage 10 so that the lubricating oil can be supplied to the lubricating oil storage chamber 14. In contrast to the second embodiment in which the lock nut 23 is fastened to the headless stud bolt 3a, the third embodiment is different in that the lock nut is omitted by using the headed stud bolt 3a.
【0019】図5は実施例4を示し、ロッカアームカバ
ー20の上壁から下方に向けてロッカアームブラケット
3bをネジ嵌合し、ロッカアームブラケット3bの下部
のガイド面39にロッカアーム押え部材4を上下摺動自
在に外嵌し、ロッカアーム押え部材4の内周部に潤滑油
貯留室14を設け、ロッカアームカバー20に貫設した
強制潤滑油路31から潤滑油導入路10及び逆止弁室1
2を介して貯留室14に潤滑油を導くようにするととも
に、当該ガイド面39を潤滑油漏出路16として構成し
たものである。FIG. 5 shows the fourth embodiment, in which the rocker arm bracket 3b is screwed downward from the upper wall of the rocker arm cover 20, and the rocker arm pressing member 4 is slid up and down on the guide surface 39 below the rocker arm bracket 3b. The rocker arm pressing member 4 is provided with a lubricating oil storage chamber 14 on the inner periphery of the rocker arm pressing member 4, and the lubricating oil introducing passage 10 and the check valve chamber 1 are inserted from the forced lubricating oil passage 31 penetrating the rocker arm cover 20.
The lubricating oil is guided to the storage chamber 14 via the guide passage 39 and the guide surface 39 is configured as the lubricating oil leak passage 16.
【0020】即ち、舟形ロッカアーム6を支持するスタ
ッドボルト3aをシリンダヘッド1から上向きに立設し
た上記実施例1〜3に対して、本実施例4はスタッドボ
ルト3aに替えてロッカアームブラケット3bをロッカ
アームカバー20から下向きに立設した点で異なり、ロ
ッカアーム押え部材4の側に潤滑油貯留室14を設ける
ので、貯留室14の容量を大きく形成できる。また、逆
止弁室14をロッカアーム押え部材4とブラケット3b
との境界部位13に設けて、潤滑油貯留室14に直接連
通するので、実施例1〜3の潤滑油案内路15を省略で
きる。尚、当該舟形ロッカアーム6の入力部6aに透孔
41を開けてプッシュロッド24にロッカアーム6内の
貯留潤滑油を案内するとともに、舟形ロッカアーム6の
出力部6b付近の前壁に切欠部43を形成して開閉弁2
5に潤滑油を案内するように構成してある。That is, in contrast to Embodiments 1 to 3 in which the stud bolt 3a supporting the boat-shaped rocker arm 6 is erected upward from the cylinder head 1, in Embodiment 4 the rocker arm bracket 3b is replaced with the rocker arm bracket 3b instead of the stud bolt 3a. The difference is that it is erected downward from the cover 20, and since the lubricating oil storage chamber 14 is provided on the rocker arm pressing member 4 side, a large capacity of the storage chamber 14 can be formed. The check valve chamber 14 is connected to the rocker arm pressing member 4 and the bracket 3b.
Since it is provided at the boundary portion 13 with the lubricating oil storage chamber 14 and communicates directly with the lubricating oil storage chamber 14, the lubricating oil guide passage 15 of the first to third embodiments can be omitted. In addition, a through hole 41 is opened in the input portion 6a of the boat-shaped rocker arm 6 to guide the stored lubricating oil in the rocker arm 6 to the push rod 24, and a notch portion 43 is formed in the front wall near the output portion 6b of the boat-shaped rocker arm 6. Then open / close valve 2
5 is configured to guide the lubricating oil.
【図1】実施例1を示す縦型頭上弁エンジンのロッカア
ーム室内の動弁装置の要部縦断面図である。FIG. 1 is a vertical cross-sectional view of a main part of a valve train in a rocker arm chamber of a vertical overhead valve engine according to a first embodiment.
【図2】実施例2を示す図1の相当図である。FIG. 2 is a view corresponding to FIG. 1 showing a second embodiment.
【図3】実施例2を示すロッカアームの平面図である。FIG. 3 is a plan view of a rocker arm showing a second embodiment.
【図4】実施例3を示す図1の相当図である。FIG. 4 is a view corresponding to FIG. 1 showing a third embodiment.
【図5】実施例4を示す図1の相当図である。FIG. 5 is a view equivalent to FIG. 1 showing a fourth embodiment.
【図6】ロッカアームの回転振れ防止の変形例を示すロ
ッカアームの縦断面図である。FIG. 6 is a vertical cross-sectional view of a rocker arm showing a modified example of preventing rotation shake of the rocker arm.
【図7】同変形例を示すロッカアームの斜視図である。FIG. 7 is a perspective view of a rocker arm showing the modification.
【図8】従来技術を示す縦型頭上弁エンジンのロッカア
ーム室周辺の縦断面図である。FIG. 8 is a vertical cross-sectional view around a rocker arm chamber of a vertical overhead valve engine showing a conventional technique.
1 シリンダヘッド 2 ロッカアーム室 3 スタッド部材 4 ロッカアーム押え部材 5 4の受け止め面 6 舟形ロッカアーム 7 6の押し当て面 8 弾圧バネ 10 潤滑油導入路 11 10の出口 12 逆止弁室 13 4の側の境界部位 14 潤滑油貯留室 15 潤滑油案内路 16 潤滑油漏出路 17 12の逆止弁体 18 3と4の嵌挿間隙 E 頭上弁エンジン P 上下方向 A 上向き B 下向き DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Rocker arm chamber 3 Stud member 4 Rocker arm pressing member 5 4 receiving surface of 4 6 Boat rocker arm 7 6 abutting surface 8 Repression spring 10 Lubricating oil introduction path 11 10 exit 12 Check valve chamber 13 4 side boundary Part 14 Lubricating oil storage chamber 15 Lubricating oil guide passage 16 Lubricating oil leak passage 17 Check valve body of 12 18 Insertion gap of 3 and 4 E Overhead valve engine P Vertical direction A Upward B Downward
Claims (1)
(2)にスタッド部材(3)を取り付け、スタッド部材(3)
にロッカアーム押え部材(4)をシリンダヘッド(1)に接
近・離間する上下方向(P)に沿って進退自在に嵌挿支持
し、ロッカアーム押え部材(4)に部分球面状の受け止め
面(5)を形成し、ロッカアーム(6)を板金で断面コ字状
の舟形に加工し、舟形ロッカアーム(6)に部分球面状の
押し当て面(7)を凹設し、当該押し当て面(7)をロッカ
アーム押え部材(4)の受け止め面(5)にシリンダヘッド
(1)に臨む下側から面接触させて、舟形ロッカアーム
(6)をロッカアーム押え部材(4)に揺動自在に支持した
頭上弁エンジンの舟形ロッカアーム型動弁装置におい
て、 上記スタッド部材(3)にロッカアーム押え部材(4)を弾
圧バネ(8)を介して支持し、弾圧バネ(8)でロッカアー
ム押え部材(4)をスタッド部材(3)に対してシリンダヘ
ッド(1)に近付く下向き(B)に弾圧付勢し、 スタッド部材(3)に潤滑油導入路(10)と逆止弁室(1
2)を設け、潤滑油導入路(10)の出口(11)を逆止弁
室(12)に連通し、スタッド部材(3)とロッカアーム押
え部材(4)の側との境界部位(13)に潤滑油貯留室(1
4)を設け、潤滑油貯留室(14)を逆止弁室(12)に連
通して、潤滑油導入路(10)からの潤滑油を逆止弁室
(12)を介して潤滑油貯留室(14)に案内するととも
に、潤滑油貯留室(14)からの潤滑油を潤滑油導入路
(10)に逆止弁室(12)の弁体(17)で逆流入不能に構
成し、 ロッカアーム押え部材(4)とスタッド部材(3)側との間
の嵌挿間隙(18)を潤滑油貯留室(14)からロッカアー
ム室(2)への潤滑油漏出路(16)として形成して、 ロッカアーム(6)がシリンダヘッド(1)から離れる上向
き(A)の力を受けると、ロッカアーム押え部材(4)がス
タッド部材(3)に対して上向き(A)に移動し、潤滑油貯
留室(14)が圧縮されて逆止弁室(12)の逆止弁体(1
7)が潤滑油導入路(10)の出口(11)を閉ざし、潤滑
油貯留室(14)から潤滑油漏出路(16)を介して潤滑油
をロッカアーム室(2)に漏出させて、ロッカアーム(6)
をスタッド部材(3)に沿って上向き(A)に移動可能に構
成したことを特徴とする頭上弁エンジンの舟形ロッカア
ーム型動弁装置。Claims: 1. A rocker arm chamber of an overhead valve engine (E).
Attach the stud member (3) to (2), and attach the stud member (3).
The rocker arm pressing member (4) is inserted and supported so as to be able to move back and forth along the vertical direction (P) approaching and separating from the cylinder head (1), and the rocker arm pressing member (4) has a partially spherical receiving surface (5). The rocker arm (6) is formed by sheet metal into a boat shape with a U-shaped cross section, and the boat-shaped rocker arm (6) is provided with a partially spherical pressing surface (7), and the pressing surface (7) is formed. The cylinder head is attached to the receiving surface (5) of the rocker arm pressing member (4).
The boat-shaped rocker arm is brought into surface contact from the lower side facing (1).
In a boat-type rocker arm type valve operating device of an overhead valve engine in which (6) is swingably supported by a rocker arm pressing member (4), the rocker arm pressing member (4) is attached to the stud member (3) via a spring (8). The rocker arm pressing member (4) is elastically biased downward (B) toward the cylinder head (1) against the stud member (3) by the elastic spring (8), and the stud member (3) is lubricated with lubricating oil. Inlet passage (10) and check valve chamber (1
2) is provided, the outlet (11) of the lubricating oil introduction passage (10) communicates with the check valve chamber (12), and the boundary portion (13) between the stud member (3) and the rocker arm pressing member (4) side Lubricating oil storage chamber (1
4) is provided, the lubricating oil storage chamber (14) is communicated with the check valve chamber (12), and the lubricating oil from the lubricating oil introduction path (10) is fed to the check valve chamber (12).
The lubricating oil from the lubricating oil storage chamber (14) is guided to the lubricating oil storage chamber (14) through the lubricating oil introduction passage
The valve body (17) of the check valve chamber (12) is configured to prevent reverse inflow in (10), and the fitting gap (18) between the rocker arm pressing member (4) and the stud member (3) side is lubricated. When the rocker arm (6) is formed as a lubricating oil leak passage (16) from the oil storage chamber (14) to the rocker arm chamber (2), and the rocker arm (6) receives an upward force (A) away from the cylinder head (1), the rocker arm presser foot is pressed. The member (4) moves upward (A) with respect to the stud member (3), the lubricating oil storage chamber (14) is compressed, and the check valve body (1) of the check valve chamber (12) is
7) closes the outlet (11) of the lubricating oil introduction passage (10), leaks lubricating oil from the lubricating oil storage chamber (14) to the rocker arm chamber (2) through the lubricating oil leak passage (16), and (6)
Is configured to be movable upward (A) along a stud member (3). A boat-type rocker arm type valve operating device for an overhead valve engine.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19854291A JPH0518215A (en) | 1991-07-12 | 1991-07-12 | Ship shaped rocker arm type valve system of overhead valve engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19854291A JPH0518215A (en) | 1991-07-12 | 1991-07-12 | Ship shaped rocker arm type valve system of overhead valve engine |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0518215A true JPH0518215A (en) | 1993-01-26 |
Family
ID=16392897
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19854291A Pending JPH0518215A (en) | 1991-07-12 | 1991-07-12 | Ship shaped rocker arm type valve system of overhead valve engine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0518215A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100340745C (en) * | 2004-03-05 | 2007-10-03 | 重庆力帆实业(集团)有限公司 | Small size universal petrol engine valve swing arm directional working mechanism |
JP2009203978A (en) * | 2008-01-30 | 2009-09-10 | Ntn Corp | Arm type valve gear |
-
1991
- 1991-07-12 JP JP19854291A patent/JPH0518215A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100340745C (en) * | 2004-03-05 | 2007-10-03 | 重庆力帆实业(集团)有限公司 | Small size universal petrol engine valve swing arm directional working mechanism |
JP2009203978A (en) * | 2008-01-30 | 2009-09-10 | Ntn Corp | Arm type valve gear |
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