JPS58204904A - Internal-combustion engine - Google Patents
Internal-combustion engineInfo
- Publication number
- JPS58204904A JPS58204904A JP8778482A JP8778482A JPS58204904A JP S58204904 A JPS58204904 A JP S58204904A JP 8778482 A JP8778482 A JP 8778482A JP 8778482 A JP8778482 A JP 8778482A JP S58204904 A JPS58204904 A JP S58204904A
- Authority
- JP
- Japan
- Prior art keywords
- journal
- bearing
- camshaft
- valve
- cam shaft
- 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.)
- Granted
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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L1/053—Camshafts overhead type
- F01L1/0532—Camshafts overhead type the cams being directly in contact with the driven valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/20—SOHC [Single overhead camshaft]
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は内燃機関、特にカムを境として両側にそれぞれ
第１．第２ジヤーナルを持つカムシャフトの下方に、そ
のカムにより開放されると共に弁ばねにより閉鎖方向に
付勢される吸気弁または排気弁を配設したオーバヘッド
カムシャフト型内燃機関に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal combustion engine, and more particularly, to an internal combustion engine, in particular, to a cam. The present invention relates to an overhead camshaft type internal combustion engine in which an intake valve or an exhaust valve is disposed below a camshaft having a second journal and is opened by the cam and biased in the closing direction by a valve spring.
本出願人は、先にこの種内燃機関として、第１ジヤーナ
ルの下部を受ける軸受部をシリンダヘッドに設け、第１
ジヤーナルおよび第２ジヤーナルの各上部を受ける一対
の軸受部を、シリンダヘッドに接合されるカムシャフト
ホルダに設け、第２ジヤーナルの下部を解放したものを
提案している（特願昭５６−１４８１８６号参照）。こ
のように構成すると、第２ジヤーナルの軸受構造が極め
て簡単となり、また第２ジヤーナルに対して特別なシー
ルを施す必要がない等の利点がある。The present applicant has previously developed an internal combustion engine of this type, in which a bearing part for receiving the lower part of the first journal is provided in the cylinder head.
It has been proposed that a pair of bearings for receiving the upper parts of the journal and the second journal are provided in a camshaft holder joined to the cylinder head, and the lower part of the second journal is left open (Japanese Patent Application No. 148186/1986). reference). This configuration has the advantage that the bearing structure of the second journal is extremely simple, and there is no need to provide a special seal to the second journal.
しかしながら、カムシャフトホルダおよびシリンダヘッ
ドに各軸受部を機械加工により形成する場合、それら軸
受部と第１．第２ジヤーナルとの間のクリアランスを全
（同一にすることは不可能であって、若し第２ジヤーナ
ル側のクリアランスが第１ジヤーナル側のそれよりも大
きい場合には、カムシャフトは片持ち状態となるため、
カムシャフトには吸、排気弁の開放時に弁ばねの反発力
に起因する大きな曲げモーメントが作用し、これを支承
する、第２ジヤーナルの軸受部に大きな負担がかかり、
その耐久性が著しく損われる。However, when forming each bearing part on the camshaft holder and the cylinder head by machining, those bearing parts and the first... If it is impossible to make the clearance between the camshaft and the second journal the same, and the clearance on the second journal side is larger than that on the first journal side, the camshaft will be in a cantilevered state. Therefore,
A large bending moment due to the repulsive force of the valve spring acts on the camshaft when the intake and exhaust valves are opened, and a large load is placed on the bearing of the second journal that supports this moment.
Its durability is significantly impaired.
本発明は上記に鑑み、カムシャフトに弁ばねの反発力が
作用したとき第２ジヤーナルを第１ジヤーナルに先んじ
て軸受部により支承し得るようにして、カムシャフトの
片持ち状態を回避するようにした、前記内燃機関を提供
することを目的とする。In view of the above, the present invention is designed to avoid a cantilevered state of the camshaft by enabling the second journal to be supported by the bearing portion before the first journal when the repulsive force of the valve spring acts on the camshaft. An object of the present invention is to provide the internal combustion engine.
以下、図面により本発明の一実施例てついて説明すると
、各図はＶ型４シリンダ内燃機関の一部を示し、１はピ
ストン２を摺合するシリンダで、その上面にはシリンダ
ヘッド３が接合され、そのシリンダヘッド３上面にはへ
ラドカバー４がパツキン５を介して接合される。シリン
ダヘッド３とへラドカバー４との内部に形成される機構
室Ｈには吸気弁用カムシャフト６１および排気弁用カム
シャフト６２が平行に配設されている。Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. Each figure shows a part of a V-type 4-cylinder internal combustion engine, and 1 is a cylinder that slides a piston 2, and a cylinder head 3 is joined to the upper surface of the cylinder. A herad cover 4 is joined to the upper surface of the cylinder head 3 via a packing 5. In a mechanism chamber H formed inside the cylinder head 3 and the head cover 4, an intake valve camshaft 61 and an exhaust valve camshaft 62 are arranged in parallel.
吸気弁用カムシャフト６□はカム７と、そのカム７を境
として両側に位置する第１．第２ジャーナル８．．８２
を持ち、その第１ジヤーナル８Ｉの下部半周部分は、シ
リンダヘッド３の内部に位置する支承部９上面の横断面
半円状内周面を持つ軸受部１０に、またその上部半周部
分は、ボルト１１〜１４によりシリンダヘッド３に接合
されるカムシャフトホルダ１５０半円状内周面を持つ軸
受部１６に回転可能に支承される。両軸受部１０゜１６
ば、それらの中央に形成された油溝、９’＋ ｒ ！Ｉ
２により右側部分１０．．１６．と、左側部分１０２゜
１６□とにそれぞれ分けられている。The intake valve camshaft 6□ includes a cam 7 and a first camshaft located on both sides of the cam 7. Second Journal8. ．． 82
The lower half circumference of the first journal 8I is connected to the bearing part 10 having a semicircular inner circumferential surface in cross section on the upper surface of the support part 9 located inside the cylinder head 3, and the upper half circumference thereof is connected to the bolt. A camshaft holder 150 joined to the cylinder head 3 by 11 to 14 is rotatably supported by a bearing portion 16 having a semicircular inner peripheral surface. Both bearings 10°16
For example, the oil groove formed in the center of them, 9'+ r! I
2 to the right side 10. ．． 16. and a left side portion of 102° and 16□.
カムシャフトホルダ１５はカム７・を跨いで外側に、半
円状内周面を持つ軸受部１７を一体に形成されており、
その軸受部１７はカムシャフト６゜０第２ジヤーナル８
２の上部半周部分のみを支承し、その結果第２ジヤーナ
ル８２の下部半周部分は解放されている。カムシャフト
６Ｉの第１ジヤーナル８１近傍に突設したフランジ部１
８は、カムシャフトホルダ１５０半環状溝１９に嵌合さ
れ、これによりカムシャフト６．の軸線方向の位置決め
がなされている。The camshaft holder 15 is integrally formed with a bearing part 17 having a semicircular inner circumferential surface on the outside so as to straddle the cam 7.
The bearing part 17 is the camshaft 6°0 second journal 8
Only the upper half of the second journal 82 is supported, so that the lower half of the second journal 82 is free. Flange portion 1 protruding near the first journal 81 of the camshaft 6I
8 is fitted into the semi-annular groove 19 of the camshaft holder 150, whereby the camshaft 6. is positioned in the axial direction.
カムシャフト６、の下方において、ロッカアーム２１が
図示しない支持軸を介してシリンダヘッド３に揺動可能
に支持され、そのロッカアーム２１５−
の二股状先端部にはそれぞれ弁間隙調節ボルト２３が螺
合されており、それらボルト２３はそれに螺合したロッ
クナツト２４により位置を固定されている。Below the camshaft 6, a rocker arm 21 is swingably supported by the cylinder head 3 via a support shaft (not shown), and a valve gap adjustment bolt 23 is screwed into each bifurcated tip of the rocker arm 215-. The bolts 23 are fixed in position by lock nuts 24 screwed therein.
両弁間隙調節ボルト２３の下方には、一対の吸気弁２５
がシリンダヘッド３に摺合され、それら吸気弁２５のス
テム２６上部に取付けられた保持部材２７とシリンダヘ
ッド３に嵌めた弁ガイド２８との間にはそれぞれ一対の
弁ばね２９．３０が内外二重に縮設されており、それら
の弾発力により弁開放中容吸気弁２５のステム２６上端
は弁間隙調節ボルト２３下端に衝合している。A pair of intake valves 25 are located below the valve gap adjustment bolts 23.
are slid onto the cylinder head 3, and between the holding member 27 attached to the upper part of the stem 26 of the intake valve 25 and the valve guide 28 fitted to the cylinder head 3, a pair of valve springs 29 and 30 are installed. Due to their elastic force, the upper end of the stem 26 of the valve-opening internal intake valve 25 abuts against the lower end of the valve gap adjustment bolt 23.
３１はヘッドカバー４をマウントラバー３２を介してカ
ムシャフトホルダ１５に固定する締付ボルト、３３はカ
ムシャフト８□に一体に形成され、または固定されるカ
ムスプロケット、３４は点火プラグである。31 is a tightening bolt that fixes the head cover 4 to the camshaft holder 15 via the mount rubber 32; 33 is a cam sprocket formed integrally with or fixed to the camshaft 8; and 34 is a spark plug.
６−
前記第１．第２ジャーナル８．．８．とカムシャフトホ
ルダー５の各軸受部１６．１７間のクリアランスの関係
は、第３図に誇張して示すように、第１ジャーナル８．
と、軸受部１６の右側および左側部分１６．．１６□と
の間のクリアランスをａ、第２ジヤーナル８２と軸受部
１７間のクリアランスを６とすると、α〉ｈとなるよう
に設定される。6- Said No. 1. Second Journal8. ．． 8. The clearance relationship between the bearings 16, 17 of the camshaft holder 5 and the first journal 8.
and the right and left portions 16. of the bearing portion 16. ．． 16□ is a, and the clearance between the second journal 82 and the bearing portion 17 is 6, then α>h.
また第１ジヤーナル８Ｉとシリンダヘッド３の軸受部１
０間のクリアランスの関係は、第１ジヤーナル８１と軸
受部１０の右側部分１０１間のクリアランスを０１第１
ジヤーナル８１と、軸受部１０の左側部分１０２間のク
リアランスなｄとするとｄ ） ｃとなるように設定蕪
れる。これにより、パ臀
カムシャフト６、にカムスプロ・ケラト３３を介してチ
ェノ３５の張力が作用した場合それを軸受部１０の右側
部分１０１で支承することができ、また比較的広いクリ
アランスｄをもつ左側部分１０２側より軸受部１０内に
潤滑油が浸入し易（なるので、両軸受部１０，１６の潤
滑が良好に行われる。In addition, the first journal 8I and the bearing portion 1 of the cylinder head 3
The relationship between the clearance between 0 and 1 is as follows:
If the clearance between the journal 81 and the left side portion 102 of the bearing portion 10 is d, then it is set so that it becomes d)c. As a result, when the tension of the cheno 35 acts on the pa buttock camshaft 6 via the cam supro kerat 33, it can be supported by the right side portion 101 of the bearing portion 10, and the left side having a relatively wide clearance d The lubricating oil easily infiltrates into the bearing part 10 from the portion 102 side (as a result, both the bearing parts 10 and 16 are well lubricated).
この場合左側部分１０２には前記チェノ３５の張力がほ
とんど作用しないのでｄ＞Ｃと設定しても同等不具合は
生じない。In this case, since the tension of the chino 35 hardly acts on the left side portion 102, the same problem will not occur even if d>C is set.
上記構成において、カムスプロケット３３を介してカム
シャフト６１が回転すると、カムγによりロッカアーム
２１が揺動して各吸気弁２５が吸気ポート３６を開放す
る方向、即ち第２図下方に移動し、その後各吸気弁２５
が弁ばね２９，３０の弾発力で吸気ポート３６を閉鎖す
る方向、即ち上方に移動し、この往復動が繰返される。In the above configuration, when the camshaft 61 rotates via the cam sprocket 33, the rocker arm 21 swings by the cam γ, and each intake valve 25 moves in the direction of opening the intake port 36, that is, downward in FIG. Each intake valve 25
is moved in the direction of closing the intake port 36, that is, upward, by the elastic force of the valve springs 29, 30, and this reciprocating movement is repeated.
この場・・１１□：
８″”パ嬰１１１１１ｉ“ｅｉ″″”２５０１Ｊｉｌｌ
ＩＯ、″
ツカアーム２１を介して両弁ばね２９．３０の反発力が
作用すると、カムシャフト６□が押上げられ、前記クリ
アランスａ ） ｈの関係より先ず第２ジヤーナル８□
が軸受部１７に支承され、次いでカムシャフト６１がそ
の第２ジヤーナル８２側を支点として僅か上方へ揺動す
るので第１ジヤーナル８□が軸受部１６に支承される。This place...11□: 8''''Pain11111i``ei''''''2501Jill
IO,'' When the repulsive force of both valve springs 29 and 30 acts through the lever arm 21, the camshaft 6□ is pushed up, and the second journal 8□
is supported by the bearing portion 17, and then the camshaft 61 swings slightly upward using the second journal 82 side as a fulcrum, so that the first journal 8□ is supported by the bearing portion 16.
その結果カムシャフト６１に作用する両弁ばね２９，３
０の反発力が両軸受部１６，１７に分散されるので、第
２ジヤーナル８□の軸受部１７の負担を軽減することが
できる。As a result, both valve springs 29, 3 acting on the camshaft 61
Since the repulsive force of 0 is distributed to both the bearing parts 16 and 17, the load on the bearing part 17 of the second journal 8□ can be reduced.
なお、排気弁用カムシャフト６２の軸受構造は前記吸気
弁用カムシャフト６□のそれと同一であるから同一部分
には同一符号を付しである。ただし３７は排気弁である
。The bearing structure of the exhaust valve camshaft 62 is the same as that of the intake valve camshaft 6□, so the same parts are given the same reference numerals. However, 37 is an exhaust valve.
以上のように本発明によれば、第２ジヤーナルと、それ
の上部を支承する軸受部間のクリアランスを、第１ジヤ
ーナルと、それの上部を支承する軸受部間のクリアラン
スよりも小さく設定したので、弁ばねの反発力が第２ジ
ヤーナルに作用すれ ９−
ば、それを第１ジヤーナルに先んじて軸受部により支承
してカムシャフトの片持ち状態を回避し、第２ジャーナ
ル軸受部の耐久性を向上させることができる。As described above, according to the present invention, the clearance between the second journal and the bearing part that supports the upper part of the second journal is set smaller than the clearance between the first journal and the bearing part that supports the upper part of the second journal. If the repulsive force of the valve spring acts on the second journal, it is supported by the bearing before the first journal to avoid a cantilevered state of the camshaft and improve the durability of the second journal bearing. can be improved.
図面は本発明の一実施例をゝ示すもので、第１図は平面
図、第２図は縦断側面図、第３図はカムシャフトと各軸
受部の関係を示す縦断側面図である。
α、６“・・クリアランス、３°°・シリンダヘット、
６、．６２・・・カムシャフト、７・・・カム、８□、
８２・・・第１．第２ジヤーナル、１０，１６．１７・
・・軸受部、１訃・・カムシャフトホルダ、２５・・・
吸気弁、２９．３０・・・弁ばね、３５・・・排気弁特
許出願人 本田技研工業株式会社
−１〇−The drawings show one embodiment of the present invention; FIG. 1 is a plan view, FIG. 2 is a longitudinal side view, and FIG. 3 is a longitudinal side view showing the relationship between the camshaft and each bearing section. α, 6”...Clearance, 3°°・Cylinder head,
6. 62...Camshaft, 7...Cam, 8□,
82...1st. 2nd Journal, 10, 16.17・
...Bearing part, 1..Camshaft holder, 25...
Intake valve, 29.30... Valve spring, 35... Exhaust valve Patent applicant Honda Motor Co., Ltd. -10-
Claims (1)
ジヤーナルとを持つカムシャフトの下方に、前記カムに
より開放されると共に弁ばねにより閉鎖方向に付勢され
る吸気弁または排気弁を配設し、前記第１ジヤーナルの
下部を支承する軸受部をシリンダヘッドに設け、前記第
１ジヤーナルおよび前記第２ジヤーナルの各上部を支承
する一対の軸受部を、前記シリンダヘッドに接合される
カムシャフトホルダに設け、前記第２ジヤーナルの下部
を解放した内燃機関において、前記第２ジヤーナルと、
それの上部を支承する前記軸受部間のクリアランスを′
、前記第１ジヤーナルと、それの上部を支承する前記軸
受部間のクリアランスよりも小さく設定してなる、内燃
機関。A cam, and the first and second cams located on both sides of the cam.
An intake valve or an exhaust valve that is opened by the cam and biased in the closing direction by a valve spring is disposed below a camshaft having a journal, and a bearing part that supports the lower part of the first journal is connected to the cylinder. In an internal combustion engine, a pair of bearings provided in a head and supporting upper portions of the first journal and the second journal are provided in a camshaft holder joined to the cylinder head, and a lower part of the second journal is open. , the second journal;
The clearance between the bearing parts that support the upper part of the
, an internal combustion engine, wherein the clearance is set smaller than the clearance between the first journal and the bearing portion that supports the upper portion of the first journal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8778482A JPS58204904A (en) | 1982-05-24 | 1982-05-24 | Internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8778482A JPS58204904A (en) | 1982-05-24 | 1982-05-24 | Internal-combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58204904A true JPS58204904A (en) | 1983-11-29 |
| JPH0151641B2 JPH0151641B2 (en) | 1989-11-06 |
Family
ID=13924599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8778482A Granted JPS58204904A (en) | 1982-05-24 | 1982-05-24 | Internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58204904A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4593657A (en) * | 1984-06-12 | 1986-06-10 | Yamaha Hatsudoki Kabushiki Kaisha | Camshaft bearing arrangement |
| JP2008215301A (en) * | 2007-03-07 | 2008-09-18 | Honda Motor Co Ltd | Camshaft bearing structure for internal combustion engine |
| JP2011117318A (en) * | 2009-12-01 | 2011-06-16 | Jtekt Corp | Camshaft device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5851205A (en) * | 1981-09-19 | 1983-03-25 | Honda Motor Co Ltd | Internal-combustion engine |
-
1982
- 1982-05-24 JP JP8778482A patent/JPS58204904A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5851205A (en) * | 1981-09-19 | 1983-03-25 | Honda Motor Co Ltd | Internal-combustion engine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4593657A (en) * | 1984-06-12 | 1986-06-10 | Yamaha Hatsudoki Kabushiki Kaisha | Camshaft bearing arrangement |
| JP2008215301A (en) * | 2007-03-07 | 2008-09-18 | Honda Motor Co Ltd | Camshaft bearing structure for internal combustion engine |
| JP2011117318A (en) * | 2009-12-01 | 2011-06-16 | Jtekt Corp | Camshaft device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0151641B2 (en) | 1989-11-06 |
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