JPH0233846B2 - - Google Patents

Info

Publication number
JPH0233846B2
JPH0233846B2 JP59043514A JP4351484A JPH0233846B2 JP H0233846 B2 JPH0233846 B2 JP H0233846B2 JP 59043514 A JP59043514 A JP 59043514A JP 4351484 A JP4351484 A JP 4351484A JP H0233846 B2 JPH0233846 B2 JP H0233846B2
Authority
JP
Japan
Prior art keywords
intake
rocker
exhaust
rocker arms
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.)
Expired - Lifetime
Application number
JP59043514A
Other languages
Japanese (ja)
Other versions
JPS60187706A (en
Inventor
Yoshiaki Hidaka
Takashi Morya
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP4351484A priority Critical patent/JPS60187706A/en
Publication of JPS60187706A publication Critical patent/JPS60187706A/en
Publication of JPH0233846B2 publication Critical patent/JPH0233846B2/ja
Granted legal-status Critical Current

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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • 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
    • 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]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Description

【発明の詳細な説明】 本発明は四弁式内燃機関、特にシリンダヘツド
に装着される点火栓の電極をシリンダ軸線の近傍
で燃焼室に臨ませ、またシリンダヘツドに装着さ
れる各一対の吸気弁及び排気弁を前記電極を囲む
ように配置した四弁式内燃機関に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a four-valve internal combustion engine, in particular, to a four-valve internal combustion engine, in which the electrode of the spark plug mounted on the cylinder head faces the combustion chamber near the cylinder axis, and The present invention relates to a four-valve internal combustion engine in which a valve and an exhaust valve are arranged to surround the electrode.

四弁式内燃機関におけるO.H.C.型動弁装置に
は、シリンダの軸線に直交するように一本のカム
軸を配設するS.O.H.C.型動弁装置と、吸、排気弁
にそれぞれ近接して吸気用及び排気用の二本のカ
ム軸を配設するD.O.H.C.型動弁装置とがあるが、
前者では、カム軸と吸、排気弁との各間を連接す
るための吸、排気ロツカアームをそれぞれ支持す
る二本のロツカ軸をカム軸の両側に配設している
ので、カム軸及びロツカ軸に干渉されて点火栓の
電極を燃焼に好条件のシリンダ軸線近傍に配置す
ることが困難であるが、クランク軸からカム軸を
駆動する調時伝動装置の構造が簡単である上、特
に重いカム軸が一本で足りることから機関の軽量
化に有利であり、それに対し、後者では、二本の
カム軸に干渉されずにシリンダ軸線近傍に点火栓
の電極を容易に配置でき、機関の出力性能の向上
を図ることができるが、調時伝動装置の構造の複
雑化と機関の重量増加は免れず、いずれも一長一
短がある。 The OHC type valve train in a four-valve internal combustion engine includes the SOHC type valve train, which has a single camshaft perpendicular to the axis of the cylinder, and the SOHC type valve train, which has one camshaft arranged perpendicular to the axis of the cylinder, and the SOHC type valve train, which has one camshaft installed in the vicinity of the intake and exhaust valves, respectively. There is a DOHC type valve train that has two camshafts for exhaust.
In the former, two rocker shafts are installed on both sides of the camshaft to support the suction and exhaust rocker arms that connect the camshaft and the intake and exhaust valves, so the camshaft and rocker shaft However, the structure of the timing transmission device that drives the camshaft from the crankshaft is simple, and the structure of the timing transmission device that drives the camshaft from the crankshaft is simple. Since only one shaft is required, it is advantageous for reducing the weight of the engine. On the other hand, in the latter case, the spark plug electrode can be easily placed near the cylinder axis without being interfered with by the two camshafts, which reduces the engine output. Although performance can be improved, the structure of the timing transmission becomes more complicated and the weight of the engine increases, so each has its advantages and disadvantages.

そこで本発明は、カム軸を一本とするにも拘ら
ず点火栓の電極のシリンダ軸線近傍への配置を可
能にし、しかもロツカ軸も一本で足りる上、シリ
ンダヘツドへの結着前にヘツドカバー上で動弁装
置の組立体を構成し得るようにして、構造簡単且
つ軽量で、組立性及び整備性の良好な前記四弁式
内燃機関を提供することを目的とするものであ
る。 Therefore, the present invention makes it possible to arrange the electrode of the spark plug near the cylinder axis even though there is only one camshaft, and in addition, only one rocker shaft is required. It is an object of the present invention to provide a four-valve internal combustion engine that is simple in structure, lightweight, and easy to assemble and maintain by making it possible to construct a valve train assembly as described above.

以下、図面により本発明の一実施例について説
明すると、先ず第１図において、紙面の表裏方向
に配列した複数本のシリンダ１を有するシリンダ
ブロツク２の上面にはガスケツト４を介してシリ
ンダヘツド３が重合して結着される。各シリンダ
１にはピストン５が摺合され、このピストン５に
対面するシリンダヘツド３の底面には燃焼室６が
凹設される。そしてこの燃焼室６にシリンダ軸線
Ａの近傍で電極１６ａを臨ませる点火栓１６が、
シリンダヘツド３に螺着される。 Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, in FIG. Polymerized and bonded. A piston 5 is slidably fitted into each cylinder 1, and a combustion chamber 6 is recessed in the bottom surface of the cylinder head 3 facing the piston 5. The spark plug 16 has an electrode 16a facing the combustion chamber 6 in the vicinity of the cylinder axis A.
It is screwed onto the cylinder head 3.

各燃焼室６の天井面は、前記複数本のシリンダ
１の配列方向に延びる稜線Ｌ（第１Ａ図参照）で
交わる屋根形の二つの斜面７ａ，７ｂにより構成
される。一方の斜面７ａには一対の吸気ポート
８，８が、また他方の斜面７ｂには同じく一対の
排気ポート９，９がそれぞれ前記稜線Ｌに沿つて
並んで開口しており、これら吸気ポート８，８及
び排気ポート９，９を開閉し得るように、各一対
の吸気弁１０，１０及び排気弁１１，１１が、シ
リンダヘツド３に設けられた弁ガイド１２，１２
及び１３，１３にそれぞれ摺動自在に装着され
る。こうして四本の弁１０，１０；１１，１１
は、前記電極１６ａを囲むように配設される。こ
れら弁１０，１０；１１，１１はそれぞれ弁ばね
１４，１４；１５，１５により閉弁方向に付勢さ
れる。 The ceiling surface of each combustion chamber 6 is constituted by two roof-shaped slopes 7a and 7b that intersect at a ridge line L (see FIG. 1A) extending in the direction in which the plurality of cylinders 1 are arranged. A pair of intake ports 8, 8 are opened on one slope 7a, and a pair of exhaust ports 9, 9 are opened in parallel along the ridge line L, respectively, on the other slope 7b. Each pair of intake valves 10, 10 and exhaust valves 11, 11 are connected to valve guides 12, 12 provided in the cylinder head 3 so as to open and close the intake valves 10, 10 and the exhaust ports 9, 9, respectively.
and 13, 13, respectively, so as to be slidable. Thus the four valves 10, 10; 11, 11
are arranged so as to surround the electrode 16a. These valves 10, 10; 11, 11 are urged in the valve closing direction by valve springs 14, 14; 15, 15, respectively.

シリンダヘツド３の上面には屋根形のヘツドカ
バー１７がシールリング１８を介して重合され、
複数本のボルト１９，１９……により結着され
る。このヘツドカバー１７の内側には前記吸、排
気弁１０，１０；１１，１１に開弁動作を与える
動弁装置２０が設けられるもので、それは次のよ
うな構成を有する。 A roof-shaped head cover 17 is superimposed on the upper surface of the cylinder head 3 via a seal ring 18.
They are connected by a plurality of bolts 19, 19, . . . . Inside the head cover 17, a valve operating device 20 is provided which opens the intake and exhaust valves 10, 10; 11, 11, and has the following configuration.

ヘツドカバー１７には、その内面に、前記稜線
Ｌ方向に配列されて上下方向に延びる複数枚の支
持壁２１，２１……が一体に形成されており、こ
れら支持壁２１，２１……には、それぞれ前記稜
線Ｌと平行な軸受孔２２，２２……及び軸孔２
３，２３……が穿設される。その際、軸受孔２
２，２２……及び軸孔２３，２３……は、それぞ
れの軸線が前記軸線Ａと略直交するように配置さ
れると共に、軸孔２３，２３……は軸受孔２２，
２２……の下方に配置される。 The head cover 17 is integrally formed with a plurality of support walls 21, 21, . . . arranged in the direction of the ridge line L and extending in the vertical direction on its inner surface. Bearing holes 22, 22... and shaft hole 2 parallel to the ridge line L, respectively
3, 23... are drilled. At that time, bearing hole 2
2, 22... and the shaft holes 23, 23... are arranged so that their respective axes are substantially orthogonal to the axis A, and the shaft holes 23, 23...
22... is arranged below.

軸受孔２２，２２……には、それらの内壁に複
数のジヤーナル２４ｊ，２４ｊ……を支承させる
ようにカム軸２４がヘツドカバー１７の一端側よ
り嵌装される。このカム軸２４は、ヘツドカバー
１７の一端面より外方へ突出させた端部において
周知の調時伝動装置２５を介して図示しないクラ
ンク軸より駆動される。 A cam shaft 24 is fitted into the bearing holes 22, 22, . . . from one end side of the head cover 17 so that a plurality of journals 24j, 24j, . The camshaft 24 is driven by a crankshaft (not shown) via a well-known timing transmission 25 at an end projecting outward from one end surface of the head cover 17.

第２図に示すように、カム軸２４には、各シリ
ンダ１に対応して、隣接する一対の排気カム２４
ｅ，２４ｅ、及びこれら排気カム２４ｅ，２４ｅ
の両外側に配置される一対の吸気カム２４ｉ，２
４ｉが相隣るジヤーナル２４ｊ，２４ｊ間におい
て形成されている。 As shown in FIG. 2, the camshaft 24 has a pair of adjacent exhaust cams 24 corresponding to each cylinder 1.
e, 24e, and these exhaust cams 24e, 24e
A pair of intake cams 24i, 2 arranged on both outer sides of
4i is formed between adjacent journals 24j, 24j.

軸孔２３，２３……には一本のロツカ軸２６が
ヘツドカバー１７の一端側より嵌装され、第３図
に示すように、その挿入口２７はキヤツプ２８で
閉鎖される。このロツカ軸２６の回転及び軸方向
移動を阻止するために、一部の支持壁２１に螺着
されたボルト２９の先端がロツカ軸２６の側壁に
嵌入される。 A rocker shaft 26 is fitted into the shaft holes 23, 23, . In order to prevent this rotation and axial movement of the rocker shaft 26, the tip of a bolt 29 screwed onto a portion of the support wall 21 is fitted into the side wall of the rocker shaft 26.

ロツカ軸２６は、各シリンダ１に対応して、吸
気弁１０，１０と吸気カム２４ｉ，２４ｉ、排気
弁１１，１１と排気カム２４ｅ，２４ｅの各間を
連接する各一対のベルクランク状の吸気ロツカア
ーム３０，３０及び排気ロツカアーム３１，３１
をそれぞれ揺動自在に支承する。 The rocker shaft 26 is a pair of bell crank-shaped intake valves that connect the intake valves 10, 10 and the intake cams 24i, 24i, and the exhaust valves 11, 11 and the exhaust cams 24e, 24e, respectively, corresponding to each cylinder 1. Rocker arms 30, 30 and exhaust rocker arms 31, 31
Each is supported so that it can swing freely.

両外側位置の吸気カム２４ｉ，２４ｉに係合す
る一対の吸気ロツカアーム３０，３０は、内側位
置の排気カム２４ｅ，２４ｅに係合する一対の排
気ロツカアーム３１，３１の両外側に位置してロ
ツカアーム間隔をカム軸２４側で広げている。両
ロツカアーム３０，３０間には、その間隔の広い
個所で前記点火栓１６の着脱を案内する筒状ソケ
ツト５０が配設され、該ソケツト５０の下部はシ
リンダヘツド３に嵌着され、その上端はシール部
材５１を介してヘツドカバー１７に嵌合される。 A pair of intake rocker arms 30, 30 that engage with intake cams 24i, 24i at both outer positions are located on both outer sides of a pair of exhaust rocker arms 31, 31 that engage with exhaust cams 24e, 24e at inner positions, so that the rocker arm spacing is maintained. are widened on the camshaft 24 side. A cylindrical socket 50 is disposed between the two rocker arms 30, 30 at a wide space between them to guide the attachment and detachment of the spark plug 16. The lower part of the socket 50 is fitted into the cylinder head 3, and the upper end thereof is It is fitted into the head cover 17 via the seal member 51.

各ロツカアーム３０，３１の弁１０，１１側端
部には弁頭間隙調節用のボルト３２，３３が螺装
され、更にこれらボルト３２，３３にはロツクナ
ツト３４，３５が螺装されている。 Bolts 32, 33 for adjusting the valve head gap are threaded onto the ends of the locker arms 30, 31 on the valve 10, 11 side, and lock nuts 34, 35 are threaded into these bolts 32, 33.

各吸、排気弁１０，１１の弁頭間隙の調節に際
しては、相対向するカム２４ｉ，２４ｅの低部と
ロツカアーム３０，３１のスリツパ面との間に所
定厚さのシツクネスゲージを挿入した状態で該ロ
ツカアーム３０，３１の調節ボルト３２，３３を
螺進または螺退させて吸、排気弁１０，１１の頭
部に当接させ、ロツクナツト３４，３５を緊締し
て調節ボルト３２，３３の調節位置を固定する。
そして前記シツクネスゲージを引抜けば、所定の
弁頭間隙が得られる。 When adjusting the valve head clearance of each intake and exhaust valve 10, 11, a thickness gauge of a predetermined thickness is inserted between the lower parts of the opposing cams 24i, 24e and the slipper surfaces of the rocker arms 30, 31. Then screw the adjusting bolts 32, 33 of the locker arms 30, 31 forward or backward to bring them into contact with the heads of the intake and exhaust valves 10, 11, and tighten the lock nuts 34, 35 to adjust the adjusting bolts 32, 33. Fix the position.
Then, by pulling out the thickness gauge, a predetermined valve head clearance can be obtained.

このような調節作業のための工具をヘツドカバ
ー１７内に挿入し得るよう、ヘツドカバーには、
各組の吸、排気カム２４ｉ，２４ｉ；２４ｅ，２
４ｅに対向して第１窓３６が、また各吸気ロツカ
アーム３０の調節ボルト３２に対向して第２窓３
７が、さらに排気ロツカアーム３１の調節ボルト
３３に対向して第３窓３８が穿設される。これら
窓３６，３７，３８は、平時にはキヤツプ３９，
４０，４１でそれぞれ閉鎖されている。 In order to insert a tool into the head cover 17 for such adjustment work, the head cover is provided with:
Each set of intake and exhaust cams 24i, 24i; 24e, 2
4e, and a second window 36 opposite the adjustment bolt 32 of each intake rocker arm 30.
Further, a third window 38 is bored opposite the adjustment bolt 33 of the exhaust rocker arm 31. During normal times, these windows 36, 37, 38 are connected to the cap 39,
40 and 41, respectively, are closed.

ロツカ軸２６は中空に形成されており、その中
空部２６ａは油路として図示しない潤滑油供給源
に接続される。 The rocker shaft 26 is formed hollow, and a hollow portion 26a thereof is connected as an oil path to a lubricating oil supply source (not shown).

ロツカ軸２６の、各ロツカアーム３０，３１を
支承する部分には、外周溝４２と、この外周溝４
２に前記中空部２６ａを連通する横孔４３とが設
けられ、そして各ロツカアーム３０，３１のボス
には、該ロツカアーム３０，３１とカム２４ｉ，
２４ｅとの係合部、並びに調節ボルト３２，３３
と吸、排気弁１０，１１との当接部にそれぞれ指
向する第１噴油孔４４，４５、並びに第２噴油孔
４６，４７がそれぞれ前記外周溝４２と連通する
ように設けられる。 A portion of the rocker shaft 26 that supports each rocker arm 30, 31 has an outer circumferential groove 42 and an outer circumferential groove 42.
2 is provided with a horizontal hole 43 that communicates with the hollow portion 26a, and the boss of each rocker arm 30, 31 is provided with a cam 24i,
24e and adjustment bolts 32, 33
First oil injection holes 44, 45 and second oil injection holes 46, 47, which respectively face the abutting portions of the intake and exhaust valves 10, 11, are provided so as to communicate with the outer circumferential groove 42, respectively.

したがつて、カム軸２４の中空部２６ａに潤滑
油が圧送されると、その油は横孔４３より外周溝
４２に移り、各ロツカアーム３０，３１のボス内
面を潤滑し、また第１及び第２噴油孔４４，４
５；４６，４７より噴出して、ロツカアーム３
０，３１とカム２４ｉ，２４ｅとの各係合部、並
びに調節ボルト３２，３３と吸、排気弁１０，１
１との各当接部に供給され、これらを潤滑する。 Therefore, when lubricating oil is pumped into the hollow part 26a of the camshaft 24, the oil moves from the horizontal hole 43 to the outer circumferential groove 42, lubricates the inner surface of the boss of each rocker arm 30, 31, and also lubricates the inner surface of the boss of each rocker arm 30, 31. 2 oil injection holes 44, 4
5; Spouting from 46, 47, Rotsuka arm 3
0, 31 and the cams 24i, 24e, as well as the adjustment bolts 32, 33 and the intake and exhaust valves 10, 1.
1 and lubricates them.

ヘツドカバー１７の内面には、排気ロツカアー
ム３１のカム軸２４側端部の直上まで垂下するオ
イルトラツプ４８が一体に突設され、カム軸２４
の回転方向は、矢印Ｒのように、その上部側でオ
イルトラツプ４８に向うよう定められる。したが
つて、カム軸２４の回転中、各カム２４ｉ，２４
ｅに付着していた潤滑油が遠心力により飛散して
オイルトラツプ４８に付着すれば、その油はオイ
ルトラツプ４８の垂直面に沿つて流下し、その下
方のロツカアーム３１，３１と排気カム２４ｅ，
２４ｅとの各係合部に滴下してそれらを潤滑す
る。 An oil trap 48 is integrally provided on the inner surface of the head cover 17 and extends directly above the camshaft 24 side end of the exhaust rocker arm 31.
The direction of rotation of the oil trap 48 is determined such that the upper side thereof faces the oil trap 48, as indicated by an arrow R. Therefore, while the camshaft 24 is rotating, each cam 24i, 24
When the lubricating oil adhering to the oil trap 48 is scattered by centrifugal force and adheres to the oil trap 48, the oil flows down along the vertical surface of the oil trap 48 and hits the rocker arms 31, 31 and the exhaust cam 24e below.
24e to lubricate them.

次にこの実施例の作用を説明する。 Next, the operation of this embodiment will be explained.

カム軸２４が調時伝動装置２５より回転される
と、それに伴い吸気カム２４ｉ，２４ｉの山部が
吸気ロツカアーム３０，３０を押動する度に、該
ロツカアーム３０，３０はロツカ軸２６を支点と
して第１図で反時計方向に揺動し、吸気弁１０，
１０を弁ばね１４，１４の閉弁力に抗して押し下
げ、これらを開弁させ、また排気カム２４ｅ，２
４ｅの山部が排気ロツカアーム３１，３１を押動
する度に、該ロツカアーム３１，３１は同じくロ
ツカ軸２６を支点として第１図で時計方向に揺動
し、排気弁１１，１１を弁ばね１５，１５の閉弁
力に抗して押し下げ、これらを開弁させる。 When the camshaft 24 is rotated by the timing transmission 25, each time the peaks of the intake cams 24i, 24i push the intake rocker arms 30, 30, the rocker arms 30, 30 move around the rocker shaft 26 as a fulcrum. In FIG. 1, the intake valve 10,
10 is pushed down against the valve closing force of the valve springs 14, 14 to open these valves, and the exhaust cams 24e, 2
Every time the peaks 4e push the exhaust rocker arms 31, 31, the rocker arms 31, 31 similarly swing clockwise in FIG. , 15 to open them.

そして、機関の圧縮行程の終期において、点火
栓１６の火花放電により燃焼室６内の混合気が点
火されると、火炎が点火栓１６の電極１６ａ付近
からその周囲に広がるが、前述のように電極１６
ａはシリンダ１の略軸線Ａ上に配置されているの
で、電極１６ａから燃焼室６の各周縁部までの距
離が略等しく、したがつて各部に火炎が短時間に
伝播するため、ノツキングの無い良好な燃焼が得
られる。 At the end of the compression stroke of the engine, when the air-fuel mixture in the combustion chamber 6 is ignited by the spark discharge from the ignition plug 16, the flame spreads from near the electrode 16a of the ignition plug 16 to its surroundings. electrode 16
Since a is arranged approximately on the axis A of the cylinder 1, the distances from the electrode 16a to each peripheral part of the combustion chamber 6 are approximately equal, and therefore the flame propagates to each part in a short time, so there is no knocking. Good combustion can be obtained.

このようにカム軸２４及びロツカ軸２６は、
吸、排気ロツカアーム３０，３１の作動に共通に
使用されるので、それぞれ一本で足り、動弁装置
２０の構造の簡素化と軽量化に寄与することがで
きる。 In this way, the camshaft 24 and rocker shaft 26 are
Since they are commonly used to operate the intake and exhaust rocker arms 30 and 31, only one rocker arm is required for each, which contributes to simplifying the structure and reducing the weight of the valve train 20.

しかも、各ロツカアーム３０，３１は、カム軸
２４及びロツカ軸２６がシリンダ１の軸線Ａと直
交するように配置されることから、腕長さを略等
しく形成され、したがつて重量も略等しくされる
ので、重量が一方のロツカアームに偏ることによ
り高速運転時に弁のジヤンピング現象が惹起され
ることを回避することができる。 Moreover, since the cam shaft 24 and the rocker shaft 26 are arranged so as to be perpendicular to the axis A of the cylinder 1, the rocker arms 30 and 31 have approximately the same arm length, and therefore have approximately the same weight. Therefore, it is possible to avoid the occurrence of a valve jumping phenomenon during high-speed operation due to the weight being biased toward one rocker arm.

また、カム軸２４及びロツカ軸２６はヘツドカ
バー１７に支持されるので、機関の組立に際して
は、予めヘツドカバー１７にカム軸２４、ロツカ
軸２６及びロツカアーム３０，３１を装着して動
弁装置２０の組立体をつくつておき、そのヘツド
カバー１７を機関の組立ラインでシリンダヘツド
３に結着すれば、動弁装置２０を吸、排気弁１
０，１１に一挙に連結することができ、したがつ
て機関の組立作業の能率が向上する。またヘツド
カバー１７を外せば、動弁装置２０もシリンダヘ
ツド３側から分離されるので、その点検、修理等
も容易に行うことができる。 Furthermore, since the camshaft 24 and the rocker shaft 26 are supported by the head cover 17, when assembling the engine, the camshaft 24, the rocker shaft 26, and the rocker arms 30, 31 are attached to the head cover 17 in advance, and the valve train 20 is assembled. If a three-dimensional body is made and the head cover 17 is attached to the cylinder head 3 on the engine assembly line, the valve train 20 will be connected to the intake and exhaust valves 1.
0, 11 can be connected all at once, thus improving the efficiency of engine assembly work. Further, when the head cover 17 is removed, the valve train 20 is also separated from the cylinder head 3 side, so that inspection, repair, etc. thereof can be easily performed.

点火栓１６の着脱に際しては、その着脱用工具
がソケツト５０内に挿入される。而してソケツト
５０は、ロツカアーム３０，３０の間隔の広い個
所に配置されているので、ロツカアーム３０，３
０に邪魔されることなく、それらの間に大径のソ
ケツト５０の配置が可能で、カム軸２４、ロツカ
軸２６、ロツカアーム３０，３１及び吸、排気弁
１０，１１等に何等邪魔されることなく点火栓１
６の着脱を容易に行うことができ、したがつて電
極１６ａのシリンダ軸線Ａ近傍への配置を可能に
する。しかも点火栓１６は、その軸線を吸、排気
弁１０，１１よりもシリンダ軸線Ａに近接させて
配置されることになり、良好な点火性能を発揮す
ることができる。 When attaching and detaching the spark plug 16, a tool for attaching and detaching the spark plug 16 is inserted into the socket 50. Since the socket 50 is disposed at a location with a wide distance between the rocker arms 30, 30, the rocker arms 30, 3
The large diameter socket 50 can be placed between them without being obstructed by the camshaft 24, rocker shaft 26, rocker arms 30, 31, intake and exhaust valves 10, 11, etc. No spark plug 1
6 can be easily attached and detached, thus making it possible to arrange the electrode 16a near the cylinder axis A. Furthermore, the ignition plug 16 is arranged with its axis closer to the cylinder axis A than the intake and exhaust valves 10 and 11, and can exhibit good ignition performance.

また吸気弁１０はソケツト５０に何等干渉され
ることがないから、対同士の弁間隔を自由に選定
することができる。例えば吸気ポート８の燃焼室
６側開口面積を最大にするような弁間隔の選定も
可能であり、機関出力の向上を図ることができ
る。 Furthermore, since the intake valves 10 are not interfered with by the sockets 50, the spacing between the pair of valves can be freely selected. For example, it is possible to select a valve spacing that maximizes the opening area of the intake port 8 on the combustion chamber 6 side, and it is possible to improve the engine output.

さらに吸、排気ポート８，９は、吸、排気弁１
０，１１よりシリンダ１外方へ延在するものであ
るから、これらもソケツト５０の干渉を受けるこ
とが全くなく、したがつて機関出力の向上に適し
た形状を自由に持つことができる。 Furthermore, the intake and exhaust ports 8 and 9 are connected to the intake and exhaust valve 1.
Since they extend outward from the cylinder 1 from 0 and 11, they are not interfered with by the socket 50 at all and can therefore have any shape suitable for improving the engine output.

尚、上記実施例において、吸、排気カム２４
ｉ，２４ｅの位置を入れ替えて、排気弁１１を点
火栓１６側に、吸気弁１０をそれと反対側に配設
してもよい。 In the above embodiment, the intake and exhaust cams 24
The positions of i and 24e may be exchanged to arrange the exhaust valve 11 on the spark plug 16 side and the intake valve 10 on the opposite side.

以上のように本発明によれば、シリンダヘツド
の上面に接着されるヘツドカバーに、シリンダの
軸線と略直交して吸、排気弁同士の配列方向に延
びる軸受孔と、この軸受孔の下方でそれと平行に
延びる軸孔とを穿設し、軸受孔には、ロツカアー
ムを介して吸、排気弁に連接する一本のカム軸を
回転自在に嵌装し、軸孔には、ロツカアームを揺
動自在に支承する一本のロツカ軸を装着し、吸、
排気弁の一方の側の一対のロツカアームが他方の
側のロツカアームの両外側でカム軸と連接するよ
うに、該一方の側の一対のロツカアームの間隔を
カム軸側で広げ、該一方の側の両ロツカアーム間
に、その間隔の広い個所で点火栓の着脱を案内す
るソケツトを配設したので、カム軸が一本で足り
るにも拘らず点火栓の電極のシリンダ軸線近傍へ
の配置を可能にし、しかもロツカ軸も一本で足り
ることから、構造が簡単且つ軽量であり、その
上、吸、排気弁のジヤンピング現象が生じる惧れ
もない。そして、シリンダヘツドへの結着前にヘ
ツドカバー上で動弁装置の組立体を構成すること
ができ、組立性及び整備性を著しく向上させるも
のである。 As described above, according to the present invention, the head cover adhered to the upper surface of the cylinder head has a bearing hole extending substantially orthogonally to the axis of the cylinder in the direction in which the intake and exhaust valves are arranged, and a bearing hole extending below the bearing hole. A shaft hole extending in parallel is drilled, and a single camshaft connected to the intake and exhaust valves via a rocker arm is rotatably fitted into the bearing hole, and the rocker arm can be freely swung into the shaft hole. Attach a single rocker shaft to support the suction,
The distance between the pair of rocker arms on one side of the exhaust valve is widened on the camshaft side so that the pair of rocker arms on one side of the exhaust valve are connected to the camshaft on both outsides of the rocker arms on the other side. A socket that guides the installation and removal of the ignition plug is placed between both rocker arms at a wide space between the two, making it possible to place the ignition plug electrode close to the cylinder axis, even though only one camshaft is required. Moreover, since only one rocker shaft is required, the structure is simple and lightweight, and there is no risk of the occurrence of the jumping phenomenon of the intake and exhaust valves. Furthermore, the assembly of the valve train can be constructed on the head cover before it is attached to the cylinder head, which significantly improves the ease of assembly and maintenance.

またロツカアームに邪魔されることなく、それ
らの間に大径のソケツトの配置が可能で、点火栓
の着脱を容易に行うことができる。しかも、点火
栓は、その軸線を吸、排気弁よりもシリンダ軸線
に近接させて配置されることになるから、良好な
点火性能を発揮することができる。 Furthermore, a large diameter socket can be placed between the rocker arms without being obstructed by the rocker arms, and the ignition plug can be easily attached and detached. Moreover, since the ignition plug is disposed with its axis closer to the cylinder axis than the intake and exhaust valves, good ignition performance can be achieved.

さらに吸、排気弁は、ソケツトに何等邪魔され
ることがないから、対同士の弁間隔を自由に選定
することができ、例えば吸、排気ポートの燃焼室
側開口面積を最大にするような弁間隔の選定も可
能であり、機関出力の向上を図ることができる。 Furthermore, since the intake and exhaust valves are not obstructed by sockets in any way, the spacing between the pairs of valves can be freely selected.For example, the valves that maximize the opening area of the intake and exhaust ports on the combustion chamber side can be It is also possible to select the interval, and it is possible to improve the engine output.

その上吸、排気ポートは、吸、排気弁よりシリ
ンダ外方へ延在するものであるから、これらもソ
ケツトの干渉を受けることが全くなく、したがつ
て機関出力の向上に適した形状を自由に持つこと
ができる。 Furthermore, since the suction and exhaust ports extend outward from the cylinder from the suction and exhaust valves, they are not interfered with by the socket at all, so they can be shaped freely to improve engine output. can be held in

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の一実施例装置を備えた内燃機
関の要部の縦断側面図、第１Ａ図は第１図中のシ
リンダヘツドの底面図、第２図は第１図の−
線断面図、第３図は第１図中のヘツドカバーの一
部横断底面図である。 Ａ……シリンダの軸線、１……シリンダ、２…
…シリンダブロツク、３……シリンダヘツド、６
……燃焼室、１０……吸気弁、１１……排気弁、
１６……点火栓、１６ａ……電極、１７……ヘツ
ドカバー、２０……動弁装置、２１……支持壁、
２２……軸受孔、２３……軸孔、２４……カム
軸、２４ｅ……排気カム、２４ｉ……吸気カム、
２４ｊ……ジヤーナル、２５……調時伝動装置、
２６……ロツカ軸、３０……吸気ロツカアーム、
３１……排気ロツカアーム、５０……ソケツト。 FIG. 1 is a vertical sectional side view of the main parts of an internal combustion engine equipped with a device according to an embodiment of the present invention, FIG. 1A is a bottom view of the cylinder head in FIG. 1, and FIG.
3 is a partially cross-sectional bottom view of the head cover in FIG. 1. A...Cylinder axis, 1...Cylinder, 2...
...Cylinder block, 3...Cylinder head, 6
... Combustion chamber, 10 ... Intake valve, 11 ... Exhaust valve,
16... Spark plug, 16a... Electrode, 17... Head cover, 20... Valve gear, 21... Support wall,
22...Bearing hole, 23...Shaft hole, 24...Camshaft, 24e...Exhaust cam, 24i...Intake cam,
24j... Journal, 25... Timing transmission device,
26...Rotsuka shaft, 30...Intake rocker arm,
31...Exhaust rocker arm, 50...Socket.

Claims (1)

【特許請求の範囲】 １ シリンダヘツド３に装着される点火栓１６の
電極１６ａをシリンダ軸線Ａの近傍で燃焼室１６
に臨ませ、またシリンダヘツド３に装着される各
一対の吸気弁１０，１０及び排気弁１１，１１を
前記電極１６ａを囲むように配置した四弁式内燃
機関において、 前記シリンダヘツド３の上面に結着されるヘツ
ドカバー１７に、シリンダ軸線Ａと略直交して
吸、排気弁１０，１０；１１，１１同士の配列方
向に延びる軸受孔２２と、この軸受孔２２の下方
でそれと平行に延びる軸孔２３とを穿設し、前記
軸受孔２２には、ロツカアーム３０，３０；３
１，３１を介して吸、排気弁１０，１０；１１，
１１に連接する一本のカム軸２４を回転自在に嵌
装し、前記軸孔２３には、ロツカアーム３０，３
０；３１，３１を揺動自在に支承する一本のロツ
カ軸２６を装着し、吸、排気弁１０，１０；１
１，１１の一方の側の一対のロツカアーム３０，
３０が他方の側のロツカアーム３１，３１の両外
側でカム軸２４と連接するように、該一方の側の
一対のロツカアーム３０，３０の間隔をカム軸２
４側で広げ、該一方の側の両ロツカアーム３０，
３０間に、その間隔の広い個所で点火栓１６の着
脱を案内するソケツト５０を配設したことを特徴
とする四弁式内燃機関。[Claims] 1. The electrode 16a of the spark plug 16 attached to the cylinder head 3 is connected to the combustion chamber 16 near the cylinder axis A.
In a four-valve internal combustion engine, each pair of intake valves 10, 10 and exhaust valves 11, 11 mounted on the cylinder head 3 are arranged so as to surround the electrode 16a. A bearing hole 22 extending in the direction in which the intake and exhaust valves 10, 10; 11, 11 are arranged substantially perpendicular to the cylinder axis A, and a shaft extending parallel to the bearing hole 22 below the bearing hole 22 are attached to the head cover 17 to be connected. A hole 23 is bored in the bearing hole 22, and rocker arms 30, 30;
Intake and exhaust valves 10, 10; 11,
A single cam shaft 24 connected to the shaft hole 23 is rotatably fitted, and a rocker arm 30, 3 is fitted into the shaft hole 23.
A single rocker shaft 26 that swingably supports the intake and exhaust valves 10, 10; 1 is installed.
A pair of rocker arms 30 on one side of 1 and 11,
The distance between the pair of rocker arms 30, 30 on one side is adjusted so that the distance between the pair of rocker arms 30, 30 on the other side is adjusted to the camshaft 24 so that
4 side, both rocker arms 30 on one side,
30. A four-valve internal combustion engine characterized in that a socket 50 for guiding the attachment and detachment of the spark plug 16 is disposed at a widely spaced location between the two.
JP4351484A 1984-03-07 1984-03-07 O.h.c. type valve gear for four valve type internal-combustion engine Granted JPS60187706A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4351484A JPS60187706A (en) 1984-03-07 1984-03-07 O.h.c. type valve gear for four valve type internal-combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4351484A JPS60187706A (en) 1984-03-07 1984-03-07 O.h.c. type valve gear for four valve type internal-combustion engine

Publications (2)

Publication Number Publication Date
JPS60187706A JPS60187706A (en) 1985-09-25
JPH0233846B2 true JPH0233846B2 (en) 1990-07-31

Family

ID=12665840

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4351484A Granted JPS60187706A (en) 1984-03-07 1984-03-07 O.h.c. type valve gear for four valve type internal-combustion engine

Country Status (1)

Country Link
JP (1) JPS60187706A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2554245B2 (en) * 1985-04-30 1996-11-13 マツダ株式会社 Single-over headed cam type engine
JPH0721022B2 (en) * 1986-03-28 1995-03-08 三菱油化株式会社 Method for producing olefin polymer
JP2564519B2 (en) * 1986-07-09 1996-12-18 本田技研工業株式会社 Valve mechanism of SOHC type internal combustion engine
JPH02149769A (en) * 1988-11-30 1990-06-08 Fuji Heavy Ind Ltd Ignition plug arrangement device of four valve type engine combustion chamber
JP4365373B2 (en) 2006-01-19 2009-11-18 トヨタ自動車株式会社 Camshaft support structure for internal combustion engine
US8042508B2 (en) 2006-01-19 2011-10-25 Toyota Jidosha Kabushiki Kaisha Camshaft support structure for internal combustion engine
JP4238874B2 (en) 2006-01-19 2009-03-18 トヨタ自動車株式会社 Camshaft support structure for internal combustion engine
JP2008057406A (en) * 2006-08-30 2008-03-13 Toyota Motor Corp Camshaft support structure for internal combustion engine
JP2008248897A (en) * 2008-07-23 2008-10-16 Toyota Motor Corp Cam shaft supporting structure of internal combustion engine
CN104832237B (en) * 2015-05-07 2018-02-23 苏州市双马机电有限公司 Valve rocker installing mechanism and its gasoline engine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5279115A (en) * 1972-05-05 1977-07-04 Peugeot Internal combustion piston engine
JPS55151104A (en) * 1979-05-12 1980-11-25 Daimler Benz Ag Cylinder head for internal combustion engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5279115A (en) * 1972-05-05 1977-07-04 Peugeot Internal combustion piston engine
JPS55151104A (en) * 1979-05-12 1980-11-25 Daimler Benz Ag Cylinder head for internal combustion engine

Also Published As

Publication number Publication date
JPS60187706A (en) 1985-09-25

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