JPH0310328Y2 - - Google Patents
Info
- Publication number
- JPH0310328Y2 JPH0310328Y2 JP1983194205U JP19420583U JPH0310328Y2 JP H0310328 Y2 JPH0310328 Y2 JP H0310328Y2 JP 1983194205 U JP1983194205 U JP 1983194205U JP 19420583 U JP19420583 U JP 19420583U JP H0310328 Y2 JPH0310328 Y2 JP H0310328Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- rocker arm
- cam
- train
- cams
- 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
Links
- 238000002485 combustion reaction Methods 0.000 claims description 10
- 230000002452 interceptive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Description
【考案の詳細な説明】
本考案は、DOHC型内燃機関の、コンパクト
で、かつ弁間隙の調節が容易なDOHC型内燃機
関に関するものである。[Detailed Description of the Invention] The present invention relates to a DOHC internal combustion engine which is compact and whose valve gap can be easily adjusted.
従来動弁カム軸下にロツカアーム軸を設け、こ
のロツカアーム軸に軸支したロツカアームを前記
ロツカアーム軸上の動弁カムにより揺動させ、ロ
ツカアームの先端に連接される開閉弁すなわち吸
気弁、あるいは排気弁を開閉作動するようにした
DOHC型内燃機関の動弁装置が知られている。
ところでこのような動弁装置において、前記ロツ
カアームの先端を二叉状に形成した一対の開閉弁
を作動するようにしたものでは、ロツカアームの
二叉端部に取付けられる弁間隙調節用アジヤスタ
の縦軸線の延長線は、動弁カム軸を横切つてのび
ることになるので、動弁機構をコンパクト化すべ
く動弁カム軸とロツカアームとを互いに接近させ
ると、前記アジヤスタを調節するためのボツクス
スパナ等の工具が動弁カム軸と干渉してしまい、
該スパナによるアジヤスタの調節が困難になり、
動弁機構のメンテナンス性に問題が生じる。 Conventionally, a rocker arm shaft is provided below the valve drive camshaft, and the rocker arm, which is pivotally supported on the rocker arm shaft, is swung by the valve drive cam on the rocker arm shaft, and an on-off valve, that is, an intake valve or an exhaust valve, is connected to the tip of the rocker arm. opened and closed.
A valve train for a DOHC internal combustion engine is known.
By the way, in such a valve train that operates a pair of on-off valves each having a forked end of the rocker arm, the vertical axis of the adjuster for adjusting the valve gap attached to the forked end of the rocker arm is The extension line extends across the valve drive camshaft, so if the valve drive camshaft and rocker arm are moved closer to each other in order to make the valve drive mechanism more compact, a box spanner or the like to adjust the adjuster may be used. The tool interfered with the valve camshaft,
It becomes difficult to adjust the adjuster using the wrench,
A problem arises in the maintainability of the valve mechanism.
本考案は上記実情にかんがみてなされたもの
で、動弁装置をコンパクト化すべく動弁カム軸と
開閉弁とを近接配置させてもロツカアーム先端の
アジヤスタをボツクススパナ，ドライバ等の工具
により簡単に調節することができ、そのメンテナ
ンス性を向上させることができるようにした
DOHC型内燃機関の動弁装置を提供することを
目的とするものである。 The present invention was developed in view of the above-mentioned circumstances, and even if the valve camshaft and on-off valve are placed close to each other in order to make the valve train more compact, the adjuster at the end of the rocker arm can be easily adjusted using a tool such as a box spanner or screwdriver. and improved maintainability.
The purpose of this invention is to provide a valve train for a DOHC internal combustion engine.
そして上記目的を達成するために本考案によれ
ば、シリンダヘツドには、複数の軸部及び動弁カ
ムを交互に配設した動弁カム軸を回転自在に支承
すると共に、該動弁カムによつて揺動駆動される
ロツカアームを支持し、そのロツカアームの先端
をアジヤスタを介して開閉弁のステム部上端に連
接させ、前記動弁カム軸の回転により前記ロツカ
アームを介して前記開閉弁を開閉作動するように
した、DOHC型内燃機関の動弁装置において、
前記動弁カムは、それが前記開閉弁の縦軸線に対
し動弁カム軸の軸線方向に偏位するよう配置さ
れ、前記軸部の、前記動弁カムとの隣接部には、
前記開閉弁の縦軸線の延長線が横切る位置に切欠
凹部が形成される。 In order to achieve the above object, according to the present invention, the cylinder head rotatably supports a valve camshaft in which a plurality of shaft parts and valve cams are arranged alternately, and A rocker arm that is driven to swing is supported, and the tip of the rocker arm is connected to the upper end of the stem portion of the on-off valve via an adjuster, and the on-off valve is opened/closed via the rocker arm by rotation of the valve drive camshaft. In a valve train for a DOHC internal combustion engine,
The valve operating cam is arranged so as to be offset in the axial direction of the valve operating cam shaft with respect to the longitudinal axis of the opening/closing valve, and a portion of the shaft adjacent to the valve operating cam includes:
A cutout recess is formed at a position where an extension of the vertical axis of the on-off valve crosses.
以下、図面により本考案をDOHC型4弁式機関
に実施した場合の一実施例について説明する。 Hereinafter, an embodiment in which the present invention is applied to a DOHC four- valve engine will be described with reference to the drawings.
第１，２図において、シリンダブロツクＢ上に
は、ガスケツトを介してシリンダヘツドΗが重合
結着される。シリンダヘツドＨの下面には、シリ
ンダに対応して燃焼室１が設けられる。燃焼室１
には、吸気ポート２に通じる一対の吸気弁口３
と、排気ポート４に通じる一対の排気弁口５とが
開口され、各吸、排気弁口３，５は通常のように
シリンダヘツドＨに摺動自在に支持される吸、排
気弁６，７によつて開閉される。 In FIGS. 1 and 2, a cylinder head Η is polymerized and bonded onto a cylinder block B via a gasket. A combustion chamber 1 is provided on the lower surface of the cylinder head H, corresponding to the cylinder. Combustion chamber 1
has a pair of intake valve ports 3 communicating with the intake port 2.
and a pair of exhaust valve ports 5 communicating with the exhaust port 4 are opened, and each of the intake and exhaust valve ports 3 and 5 has intake and exhaust valves 6 and 7 slidably supported on the cylinder head H as usual. It is opened and closed by.
シリンダヘツドＨの開口上面には、パツキン８
を介してヘツドカバー９が被着され該カバー９の
オイル注入用の開口部１０はキヤツプ１１によつ
て被覆される。シリンダヘツドＨの上面左右には
ヘツドカバー９と協働して吸気および排気側動弁
カム室Ci，Ceが形成され、前記両動弁カム室Ci，
Ce内には、それぞれ吸気および排気側動弁装置
Vi，Veが設けられる。 There is a gasket 8 on the top of the opening of the cylinder head H.
A head cover 9 is attached through the head cover 9, and an oil injection opening 10 of the cover 9 is covered with a cap 11. Intake and exhaust side valve cam chambers Ci, Ce are formed on the left and right sides of the upper surface of the cylinder head H in cooperation with the head cover 9, and the two valve cam chambers Ci,
Inside the Ce are intake and exhaust side valve gears, respectively.
Vi and Ve are provided.
而してそれらの動弁装置Vi，Veは何れも同一
の構造であるので、以下に吸気側動弁装置Viの
構成について詳細に説明する。 Since these valve operating devices Vi and Ve have the same structure, the structure of the intake side valve operating device Vi will be explained in detail below.
動弁カム室Ci内において、シリンダヘツドＨに
は、複数の軸部１２ｂ及び動弁カム１２ａを交互
に配設した動弁カム軸１２が回転自在に支承され
るとともにその略直下にロツカーアーム軸１３が
固定支持される。ロツカーアーム軸１３にはロツ
カーアーム１４が上下に揺動自在に支承される。
ロツカーアーム１４の先端部は、第２図に示すよ
うに平面よりみて二叉状に形成され、その両先端
部１４ａ，１４ｂにはアジヤスタＡが取付けられ
る。このアジヤスタＡはロツカーアーム１４の先
端に螺挿されるアジヤストねじ１５と、このアジ
ヤストねじ１５に螺着されるナツト１６とにより
構成される。アジヤストねじ１５の下端は、吸気
弁６のステム部６ａ上端に当接される。そしてナ
ツト１６を緩めアジヤストねじ１５を螺進あるい
は螺退調節することにより吸気弁６と吸気弁口３
間の弁間隙が調整される。In the valve cam chamber Ci, a cylinder head H rotatably supports a valve cam shaft 12 in which a plurality of shaft portions 12b and valve cams 12a are arranged alternately, and a rocker arm shaft 13 is supported substantially directly below the valve cam shaft 12. is fixedly supported. A rocker arm 14 is supported on the rocker arm shaft 13 so as to be able to swing up and down.
The distal end of the rocker arm 14 is formed into a bifurcated shape when viewed from above, as shown in FIG. 2, and an adjuster A is attached to both distal ends 14a and 14b. The adjuster A is composed of an adjuster screw 15 screwed into the tip of the rocker arm 14, and a nut 16 screwed onto the adjuster screw 15. The lower end of the adjustment screw 15 is brought into contact with the upper end of the stem portion 6a of the intake valve 6. Then, by loosening the nut 16 and adjusting the adjusting screw 15 by screwing it forward or backward, the intake valve 6 and the intake valve port 3 are adjusted.
The valve gap between the two is adjusted.
前記動弁カム１２ａは、それが前記吸気弁６の
縦軸線ｌ−ｌに対し動弁カム軸１２の軸線方向に
偏位（第２図参照）するよう配置されており、ま
たその動弁カム軸１２の軸部１２ｂの、動弁カム
１２ａとの隣接部には、前記吸気弁６の縦軸線ｌ
−ｌの延長線が横切る位置に、その周方向に沿つ
て切欠凹部１７が形成される。而して前記切欠凹
部１７により、動弁カム軸１２には干渉せずに、
第１図鎖線に示すように、ボツクススパナ等の工
具をアジヤスタＡに向けて挿入することができ
る。 The valve cam 12a is arranged so that it is offset in the axial direction of the valve cam shaft 12 (see FIG. 2) with respect to the longitudinal axis l-l of the intake valve 6, and the valve cam 12a is The vertical axis l of the intake valve 6 is located at a portion of the shaft portion 12b of the shaft 12 adjacent to the valve operating cam 12a.
A notch recess 17 is formed along the circumferential direction at a position where the extension line of -l crosses. Therefore, the notch recess 17 allows the valve drive camshaft 12 to be moved without interfering with it.
As shown by the chain line in FIG. 1, a tool such as a box spanner can be inserted toward the adjuster A.
前記排気側動弁カム室Ce内にも排気側動弁装
置Veが設けられるが、この動弁装置Veも前記吸
気側動弁装置Viと同一構造であり、動弁カム１
８ａを有する排気側動弁カム軸１８下のロツカア
ーム軸１９にはロツカアーム２０が揺動自在に支
承される。そして前記吸気側動弁装置Viと同一
部材には同一符号が付されている。 An exhaust side valve train Ve is also provided in the exhaust side valve train cam chamber Ce, but this valve train Ve also has the same structure as the intake side valve train Vi, and the valve train cam 1
A rocker arm 20 is swingably supported on a rocker arm shaft 19 below the exhaust side valve drive camshaft 18 having a diameter of 8a. The same members as those in the intake side valve operating device Vi are given the same reference numerals.
次に本考案の実施例の作用について説明する。 Next, the operation of the embodiment of the present invention will be explained.
機関の運転により吸気および排気側動弁カム軸
１２，１８が回転されれば、それらの軸１２，１
８上の動弁カム１２ａ，１８ａと弁ばねとの協働
により吸気および排気側ロツカアーム１４，２０
はロツカーアーム軸１３，１９回りに上下に揺動
し、吸、排気弁６，７を所定のタイミングを以て
開閉作動する。 When the intake and exhaust side valve drive camshafts 12, 18 are rotated due to engine operation, these shafts 12, 1
The intake and exhaust side rocker arms 14, 20 are activated by the cooperation of the valve drive cams 12a, 18a on the 8 and the valve springs.
swings up and down around the rocker arm shafts 13 and 19, opening and closing the intake and exhaust valves 6 and 7 at predetermined timings.
ところでいま吸気弁６の弁間隙を調整するに
は、ヘツドカバー９を外したのち、第１図鎖線に
示すようにボツクススパナＳ等の工具をアジヤス
タＡに向けて挿入する。このとき前記工具は動弁
カム軸１２の切欠凹部１７を横切つても該軸１２
と干渉することがなく前記アジヤスタＡを操作し
て弁間隙を調整することができる。 Now, in order to adjust the valve gap of the intake valve 6, after removing the head cover 9, insert a tool such as a box spanner S toward the adjuster A as shown by the chain line in FIG. At this time, even if the tool crosses the notch recess 17 of the valve camshaft 12, the shaft 12
The valve gap can be adjusted by operating the adjuster A without interfering with the valve.
また排気弁７の弁間隙も前述と全く同じように
調整することができる。 Further, the valve gap of the exhaust valve 7 can be adjusted in exactly the same manner as described above.
尚本案実施例のロツカーアーム揺動機構はロツ
カーアーム軸に支承されているが、エンドピポツ
トタイプのロツカーアーム揺動機構においても実
施可能である。 Although the rocker arm swinging mechanism of the present embodiment is supported by the rocker arm shaft, it can also be implemented in an end pivot type rocker arm swinging mechanism.
以上のように本考案によれば、シリンダヘツド
には、複数の軸部及び動弁カムを交互に配設した
動弁カム軸を回転自在に支承すると共に、該動弁
カムによつて揺動駆動されるロツカーアームを支
持し、そのロツカアームの先端をアジヤスタを介
して開閉弁のステム部上端に連接させ、前記動弁
カム軸の回転により前記ロツカアームを介して前
記開閉弁を開閉作動するようにした、DOHC型
内燃機関の動弁装置において、前記動弁カム軸に
は、前記開閉弁の縦軸線の延長線が横切る位置に
切欠凹部が形成されるので、外部より開閉弁の軸
線方向に沿つて動弁カム室内に装入されるボツク
ススパナ，ドライバ等の工具が動弁カム軸の軸線
方向投影面内に進入しても、それと該動弁カム軸
との干渉を容易に回避することができ、これによ
り、動弁カム軸と開閉弁とを相互に接近配置する
ことができ、全体として動弁装置を大幅にコンパ
クト化することができ、また上記工具の操作が容
易となつて、弁間〓の調整を容易に行うことがで
き、動弁装置のメンテナンス性を向上させること
ができる。 As described above, according to the present invention, the cylinder head rotatably supports a valve camshaft in which a plurality of shaft parts and valve cams are arranged alternately, and the cylinder head is oscillated by the valve cam. The rocker arm is supported to be driven, and the tip of the rocker arm is connected to the upper end of the stem portion of the on-off valve via an adjuster, and the on-off valve is opened and closed via the rocker arm by rotation of the valve drive camshaft. In the valve train for a DOHC internal combustion engine, the valve train camshaft is formed with a notch recess at a position where an extension of the vertical axis of the on-off valve crosses, so that it can be easily accessed from the outside along the axial direction of the on-off valve. Even if tools such as box spanners and drivers inserted into the valve cam chamber enter the axial projection plane of the valve camshaft, interference between them and the valve camshaft can be easily avoided. As a result, the valve train camshaft and the on-off valve can be arranged close to each other, and the valve train as a whole can be made significantly more compact.In addition, the above-mentioned tool can be easily operated, and the valve Adjustment of 〓 can be easily performed, and the maintainability of the valve train can be improved.
また特に前記動弁カムを、それが前記開閉弁の
縦軸線に対し動弁カム軸の軸線方向に偏位するよ
う配置して、前記切欠凹部を前記軸部の、動弁カ
ムとの隣接部に形成したので、その切欠凹部の特
設によつても動弁カムのカム面には凹部が形成さ
れず、従つて、その凹部のためにカム面の面圧が
特別に高くなつてカムの耐久性を損なうような虞
れはなく、しかも上記切欠凹部を動弁カムのカム
面に形成したものに比べて、切欠凹部と動弁カム
軸の軸線との間の距離を短縮することができるか
ら、動弁カム軸と開閉弁とを一層接近させること
ができ、動弁装置の一層のコンパクト化を図るこ
とができる。 In particular, the valve drive cam is arranged so that it is offset in the axial direction of the valve drive cam shaft with respect to the longitudinal axis of the on-off valve, and the notch recess is located in a portion of the shaft adjacent to the valve drive cam. Therefore, even with the special provision of the notched recess, no recess is formed on the cam surface of the valve operating cam, and therefore, the surface pressure on the cam surface is particularly high due to the recess, which reduces the durability of the cam. There is no risk of impairing performance, and the distance between the notch recess and the axis of the valve cam shaft can be shortened compared to when the above-mentioned notch recess is formed on the cam surface of the valve cam. , the valve train camshaft and the on-off valve can be brought closer together, and the valve train can be made more compact.
図面は本考案の一実施例を示すもので、第１図
は本考案装置を装備した内燃機関の頭部の縦断面
図、第２図は第１図は線矢示図である。
Ａ……アジヤスタ、Ｈ……シリンダヘツド、ｌ
−ｌ……縦軸線、６，７……開閉弁としての吸，
排気弁、１２，１８……動弁カム軸、１２ａ，１
８ａ……動弁カム、１２ｂ，１８ｂ……軸部、１
３，１９……ロツカアーム軸、１４，２０……ロ
ツカアーム、１７……切欠凹部。
The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal sectional view of the head of an internal combustion engine equipped with the device of the present invention, and FIG. 2 is a diagram showing line arrows in FIG. 1. A...Adjuster, H...Cylinder head, l
-l... Vertical axis line, 6, 7... Suction as an on-off valve,
Exhaust valve, 12, 18...Valve drive camshaft, 12a, 1
8a...Valve train cam, 12b, 18b...Shaft portion, 1
3, 19... Locker arm shaft, 14, 20... Locker arm, 17... Notch recess.
Claims (1)
８ｂ及び動弁カム１２ａ，１８ａを交互に配設し
た動弁カム軸１２，１８を回転自在に支承すると
共に、該動弁カム１２ａ，１８ａによつて揺動駆
動されるロツカアーム１４，２０を支持し、その
ロツカアーム１４，２０の先端をアジヤスタＡを
介して開閉弁６，７のステム部上端に連接させ、
前記動弁カム軸１２，１８の回転により前記ロツ
カアーム１４，２０を介して前記開閉弁６，７を
開閉作動するようにした、DOHC型内燃機関の
動弁装置において、前記動弁カム１２ａ，１８ａ
は、それが前記開閉弁６，７の縦軸線に対し動弁
カム軸１２，１８の軸線方向に偏位するよう配置
され、前記軸部１２ｂ，１８ｂの、前記動弁カム
１２ａ，１８ａとの隣接部には、前記開閉弁６，
７の縦軸線の延長線が横切る位置に切欠凹部１７
が形成されたことを特徴とする、DOHC型内燃
機関の動弁装置。 The cylinder head H has a plurality of shaft portions 12b, 1
8b and valve-driving cams 12a, 18a arranged alternately, rotatably supports valve-driving cam shafts 12, 18, and supports rocker arms 14, 20 which are swing-driven by the valve-driving cams 12a, 18a. Then, the tips of the rocker arms 14, 20 are connected to the upper ends of the stem parts of the on-off valves 6, 7 via the adjuster A,
In a valve train for a DOHC internal combustion engine, the valve drive cams 12a, 18a are configured to open and close the on-off valves 6, 7 via the rocker arms 14, 20 by rotation of the valve drive cam shafts 12, 18.
is arranged such that it is offset in the axial direction of the valve drive camshafts 12, 18 with respect to the vertical axes of the on-off valves 6, 7, and the shaft portions 12b, 18b are arranged so as to be offset from the valve drive cams 12a, 18a. The on-off valve 6,
A notch recess 17 is located at a position where the extension line of the vertical axis line of 7 crosses.
A valve train for a DOHC internal combustion engine, which is characterized by the following:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19420583U JPS60102404U (en) | 1983-12-17 | 1983-12-17 | Valve gear for DOHC internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19420583U JPS60102404U (en) | 1983-12-17 | 1983-12-17 | Valve gear for DOHC internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60102404U JPS60102404U (en) | 1985-07-12 |
| JPH0310328Y2 true JPH0310328Y2 (en) | 1991-03-14 |
Family
ID=30417500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19420583U Granted JPS60102404U (en) | 1983-12-17 | 1983-12-17 | Valve gear for DOHC internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60102404U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2632888B2 (en) * | 1988-01-11 | 1997-07-23 | ヤマハ発動機株式会社 | Valve train for multi-valve engine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60104706A (en) * | 1983-11-11 | 1985-06-10 | Suzuki Motor Co Ltd | Operation device of engine valve |
-
1983
- 1983-12-17 JP JP19420583U patent/JPS60102404U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60104706A (en) * | 1983-11-11 | 1985-06-10 | Suzuki Motor Co Ltd | Operation device of engine valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60102404U (en) | 1985-07-12 |
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