JPH01253552A - Cylinder head structure of dohc engine - Google Patents
Cylinder head structure of dohc engineInfo
- Publication number
- JPH01253552A JPH01253552A JP8143188A JP8143188A JPH01253552A JP H01253552 A JPH01253552 A JP H01253552A JP 8143188 A JP8143188 A JP 8143188A JP 8143188 A JP8143188 A JP 8143188A JP H01253552 A JPH01253552 A JP H01253552A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder head
- storage chamber
- oil
- oil supply
- supply passage
- 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
- 230000007246 mechanism Effects 0.000 claims abstract description 23
- 238000004891 communication Methods 0.000 claims abstract description 10
- 239000003921 oil Substances 0.000 claims description 122
- 239000010687 lubricating oil Substances 0.000 claims description 28
- 238000005461 lubrication Methods 0.000 abstract 6
- 239000000314 lubricant Substances 0.000 abstract 1
- 238000003780 insertion Methods 0.000 description 8
- 230000037431 insertion Effects 0.000 description 8
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Classifications
-
- 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
- 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
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
- F01L1/245—Hydraulic tappets
- F01L1/25—Hydraulic tappets between cam and valve stem
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
- F01M9/10—Lubrication of valve gear or auxiliaries
- F01M9/106—Oil reservoirs
-
- 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
- F02F1/26—Cylinder heads having cooling means
- F02F1/36—Cylinder heads having cooling means for liquid cooling
- F02F1/38—Cylinder heads having cooling means for liquid cooling the cylinder heads being of overhead valve type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
- F01M9/10—Lubrication of valve gear or auxiliaries
- F01M9/107—Lubrication of valve gear or auxiliaries of rocker shaft bearings
-
- 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
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
-
- 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
- F02B2275/02—Attachment or mounting of cylinder heads on cylinders
-
- 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
- F02B2275/18—DOHC [Double 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
- 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)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はＤＯＨＣエンジンのシリンダヘッド構造に係わ
り、特に油圧バルブリフターに支承部を供給する主給油
通路のエアー抜き構造の簡略化とシリンダヘッドの小型
化とを計ったシリンダヘッド構造に関する。Detailed Description of the Invention (Industrial Application Field) The present invention relates to the cylinder head structure of a DOHC engine, and in particular to the simplification of the air vent structure of the main oil supply passage that supplies the support part to the hydraulic valve lifter, and the construction of the cylinder head. This invention relates to a cylinder head structure designed to reduce size.
（従来の技術）
従来からＤＯＨＣエンジンにあっては、吸気側及び排気
側動弁機構のそれぞれのカム軸の各カムとバルブステム
との間にバルブラッシュクリアランスを常にゼロに自動
調整する油圧バルブリフターを設けて、この油圧バルブ
リフターを介してカム軸のバルブリフト力を各バルブス
テムに伝達するようにしたものが知られている。(Prior Art) Conventionally, in DOHC engines, a hydraulic valve lifter is used to automatically adjust the valve lash clearance between each cam of each camshaft of the intake side and exhaust side valve mechanism and the valve stem to always be zero. It is known that the valve lift force of the camshaft is transmitted to each valve stem via the hydraulic valve lifter.
コノ様なりＯＨＣエンジンでは、各気筒のバルブに対応
して、そのシリンダヘッドの各版・排気倒動弁機構の支
承部には上記油圧バルブリフターを収納するための収納
孔が形成されており、かつその収納孔の側方の各支承部
にはエンジンの幅方向の外側に位置されて各収納孔に連
通ずる主給油通路がエンジンの長手方向に沿って形成さ
れていて、この主給油通路から油圧バルブリフター内に
支承部として潤滑油が補給されるようになっている。ま
た、上記主給油通路は下方のシリンダブロック側の給油
通路に連通されていて、オイルパン内の潤滑油がオイル
ポンプによって圧送されるようになっている。In Kono's OHC engine, a storage hole for storing the hydraulic valve lifter is formed in each version of the cylinder head and the support part of the exhaust tilting valve mechanism, corresponding to the valve of each cylinder. In addition, a main oil supply passage that is located on the outside in the width direction of the engine and communicates with each storage hole is formed along the longitudinal direction of the engine in each support part on the side of the storage hole, and from this main oil supply passage Lubricating oil is supplied as a bearing inside the hydraulic valve lifter. Further, the main oil supply passage is communicated with an oil supply passage on the lower cylinder block side, so that the lubricating oil in the oil pan is pumped by an oil pump.
ところで、オイルポンプの作動が止まると潤滑油はその
自重で徐々にオイルパン内に流下して主給油通路内には
エアーが侵入する。また、オイルポンプが作動中であっ
ても、上記給油通路内にエアーが混入することは避けが
たい。しかし、潤滑油と共にエアーを油圧バルブリフタ
ー内に吸入させてしまうと油圧バルブリフターに支承油
圧が生じなくなって、動弁機構部から異音が発生１７た
り、破損を招いたりする。By the way, when the oil pump stops operating, the lubricating oil gradually flows down into the oil pan due to its own weight, and air enters the main oil supply passage. Further, even when the oil pump is in operation, it is difficult to avoid air entering the oil supply passage. However, if air is sucked into the hydraulic valve lifter along with the lubricating oil, the hydraulic valve lifter will no longer be able to generate supporting hydraulic pressure, causing abnormal noises to be generated from the valve mechanism or damage.
そこで従来にあっては、シリンダヘッドに形成する主給
油通路の途中に連通させて、その主給油通路より上方に
位置する貯油室を形成し、この貯油室の上部にエアー抜
き孔を設けてこのエアー抜き孔から主給油通路内に混入
したエアーを外部に排出させるようにしている。（実開
昭６１−２０２６１３号公報等）
（発明が解決しようとする課題）
しかしながら、上記従来のものにあっては、オイルポン
プの作動が停止されると主給油通路内の潤滑油が流下し
てここにエアーが侵入してしまうので、エンジンを再始
動させたときにその初期に油圧バルブリフター内にエア
ーを吸入させてしまう虞がある。また、エアー抜き構造
を有する貯油室を吸気側と排気側との双方の主給油通路
にそれぞれ個別に設けなければならず、このため主給油
通路のエアー抜き構造が複雑になって加工コストが高騰
するとともに、シリンダヘッドが幅方向に大型化すると
いう問題がある。Therefore, conventionally, an oil storage chamber is formed in the middle of the main oil supply passage formed in the cylinder head and located above the main oil supply passage, and an air vent hole is provided in the upper part of this oil storage chamber. Air that has entered the main oil supply passage is discharged to the outside through the air vent hole. (Utility Model Application Publication No. 61-202613, etc.) (Problem to be Solved by the Invention) However, in the above conventional system, when the operation of the oil pump is stopped, the lubricating oil in the main oil supply passage flows out. Since air enters here, there is a risk that air may be sucked into the hydraulic valve lifter at the initial stage when the engine is restarted. In addition, oil storage chambers with air bleed structures must be installed separately in the main oil supply passages on both the intake and exhaust sides, which complicates the air bleed structure of the main oil supply passages and increases processing costs. At the same time, there is a problem that the cylinder head becomes larger in the width direction.
本発明は、この様な事情に鑑みてなされたちのであり、
その目的は、オイルポンプの作動が停止されても主給油
通路内の潤滑油が流下することがなく、かつエアー抜き
構造を簡略化することができるとともに、シリンダヘッ
ドの幅をコンパクトに形成できるＤＯＨＣエンジンのシ
リンダヘッド構造を提供することにある。The present invention was made in view of these circumstances.
The purpose of this is to prevent the lubricating oil in the main oil supply passage from flowing down even when the oil pump stops operating, simplify the air bleeding structure, and make the width of the cylinder head compact. The purpose is to provide a cylinder head structure for an engine.
（課題を解決するための手段）
本発明は上記の目的を達成するために、エンジンの長手
方向に沿って形成された吸気側動弁機構の支承部と排気
側動弁機構の支承部との間に空間部を有し、前記各支承
部はそれぞれ各気筒毎に吸気側及び排気側動弁機構の油
圧バルブリフターを収納する収納孔及びカム軸受部より
構成され、前記各支承部にはその収納孔に連通して油圧
バルブリフターに潤滑油を供給する主給油通路がその長
手方向に沿って吸気側と排気側に各々形成されたＤＯＨ
Ｃエンジンのシリンダヘッドにおいて、前記主給油通路
を各支承部のシリンダヘッドの内側に位置させて形成す
るとともに、各支承部間の空間部には前記給油通路より
も上方に位置させてシリンダヘッドに一体的に形成した
貯油室を設け、該貯油室にはシリンダブロック側の給油
通路に連通ずる送油通路と前記各主給油通路に連通ずる
連通路とを接続させ、かつ貯油室の上部にはエアー抜き
孔を備えるプラグを設けた。(Means for Solving the Problems) In order to achieve the above object, the present invention has a structure in which a support part of an intake side valve mechanism and a support part of an exhaust side valve mechanism are formed along the longitudinal direction of the engine. Each of the supporting parts includes a housing hole and a cam bearing part for storing the hydraulic valve lifters of the intake and exhaust side valve mechanisms for each cylinder, and each of the supporting parts has a space in between. A DOH in which main oil supply passages that communicate with the storage hole and supply lubricating oil to the hydraulic valve lifter are formed on the intake side and the exhaust side along the longitudinal direction.
In the cylinder head of the C engine, the main oil supply passage is formed by being located inside the cylinder head of each bearing part, and the main oil supply passage is located above the oil supply passage in the space between each of the bearing parts, and is formed in the cylinder head. An integrally formed oil storage chamber is provided, and an oil supply passage communicating with the oil supply passage on the cylinder block side and a communication passage communicating with each of the main oil supply passages are connected to the oil storage chamber. A plug with an air vent hole was provided.
（作 用）
上記構成の本発明によれば、主給油通路よりも上方に位
置されて貯油室が形成され、この貯油室を経由して主給
油通路内にシリンダブロック側の給油通路から潤滑油が
送給されるので、オイルポンプの作動が停止されても主
給油通路内の潤滑油が流下することはない。また、主給
油通路はシリンダヘッドの内側に位置させて吸・排気側
動弁機構の各支承部に形成し、貯油室はその各支承部間
のデッドスペースに位置させてシリンダヘッドに一体形
成するので、吸・排気側の主給油通路のエアー抜き構造
を１つの貯油室で共用させることができ、シリンダヘッ
ドの幅を可及的にコンパクトに形成できる。(Function) According to the present invention having the above configuration, an oil storage chamber is formed above the main oil supply passage, and lubricating oil is supplied from the oil supply passage on the cylinder block side into the main oil supply passage via this oil storage chamber. Since lubricating oil in the main oil supply passage does not flow down even if the operation of the oil pump is stopped. In addition, the main oil supply passage is located inside the cylinder head and is formed at each support part of the intake and exhaust valve mechanism, and the oil storage chamber is located in the dead space between each support part and is formed integrally with the cylinder head. Therefore, the air vent structure of the main oil supply passage on the intake and exhaust sides can be shared by one oil storage chamber, and the width of the cylinder head can be made as compact as possible.
（実施例）
以下に本発明の好適な一実施例を添附図面に基づき詳述
する。(Embodiment) A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
第１図はＤＯＨＣエンジンのシリンダヘッドの平面図で
あり、第２図は第１図中の■−■線矢視断面図である。FIG. 1 is a plan view of a cylinder head of a DOHC engine, and FIG. 2 is a sectional view taken along the line ■-■ in FIG.
図示するように、シリンダヘッド２の幅方向の中央部に
は、各気筒のほぼ中心に位置されて点火プラグの挿入孔
４が設けられている。各点火プラグ挿入孔４の側方には
、図示していない吸気弁側動弁機構の支承部６と排気弁
側動弁機構の支承部８とがシリンダヘッドの長手方向に
沿って上方に隆起されて設けられており、これら吸気側
と排気側との支承部６，８間には空間部（デッドスペー
ス）１０が存在している。As shown in the figure, a spark plug insertion hole 4 is provided in the widthwise center of the cylinder head 2, located approximately at the center of each cylinder. On the side of each spark plug insertion hole 4, a support part 6 of the intake valve side valve operating mechanism and a support part 8 of the exhaust valve side valve operating mechanism (not shown) protrude upward along the longitudinal direction of the cylinder head. A space (dead space) 10 exists between the support portions 6 and 8 on the intake side and the exhaust side.
各版・排気側動弁機構の支承部６，８には各気筒に対応
してカム軸受部１２と油圧バルブリフターの収納孔１４
とが形成されており、収納孔】４は各気筒のバルブ（図
示せず）に対応してそのバルブの開閉方向に沿ってその
直上に設けられている。すなわち、このシリンダヘッド
２に取付けられる各版・排気側動弁機構は直動型のもの
でカム軸１６の各カム１６ａとバルブステムとの間に油
圧バルブリフター１８が介在されるようになっている。Each version has a cam bearing 12 and a hydraulic valve lifter storage hole 14 corresponding to each cylinder in the support parts 6 and 8 of the exhaust side valve mechanism.
A storage hole 4 is provided corresponding to a valve (not shown) of each cylinder and directly above the valve along the opening/closing direction of the valve. That is, each plate/exhaust side valve mechanism attached to this cylinder head 2 is of a direct-acting type, and a hydraulic valve lifter 18 is interposed between each cam 16a of the camshaft 16 and the valve stem. There is.
吸気弁及び排気弁は各気筒毎に２本つづ配設されるよう
になっており、これにともない油圧バルブリフターの収
納孔１４も２つづつ設けられていて、カム軸受部１２は
その各版・排気側の２つの収納孔１４．１４間にそれぞ
れ位置されて、点火プラグ挿入孔４のボス部４ａに連な
ってシリンダブロック２の幅方向に連続して一体的に形
成されている。Two intake valves and two exhaust valves are provided for each cylinder, and accordingly, two storage holes 14 for hydraulic valve lifters are also provided, and the cam bearing portion 12 is arranged in each version. - They are located between the two storage holes 14 and 14 on the exhaust side, and are integrally formed in a continuous manner in the width direction of the cylinder block 2 so as to be continuous with the boss portion 4a of the spark plug insertion hole 4.
吸気側及び排気側動弁機構の各支承部６，８には、各気
筒の動弁機構の油圧バルブリフター１８に支承部として
潤滑油を供給するための主給油通路２０ａ、２０ｂが、
シリンダヘッド２の長手方向に沿って油圧バルブリフタ
ー１８の収納孔１４と点火プラグ挿入孔４との間にそれ
ぞれ形成され、各収納孔１４は分岐通路２２で主給油通
路２０ａ。Main oil supply passages 20a, 20b for supplying lubricating oil to the hydraulic valve lifter 18 of the valve train of each cylinder as a support are provided in each of the support parts 6, 8 of the intake side and exhaust side valve train mechanisms.
Each storage hole 14 is formed along the longitudinal direction of the cylinder head 2 between the storage hole 14 of the hydraulic valve lifter 18 and the spark plug insertion hole 4, and each storage hole 14 is a branch passage 22 and a main oil supply passage 20a.
２０ｂに連通されている。また、吸気側の主給油通路２
０ａと排気側の主給油通路２０ｂとはシリンダヘッド２
の幅方向に沿ってその前端部側と後端部側とに設けられ
た連通路２４ａ、２４ｂで結ばれており、その各連通路
２４ ａ、２４ｂにはシリンダヘッド２の前端部と後端
部とに設けられたカム軸受部２６．２８に潤滑油を供給
する分岐通路３０ａ、３０ｂが接続されている。20b. In addition, the main oil supply passage 2 on the intake side
0a and the main oil supply passage 20b on the exhaust side are the cylinder head 2.
The front end and the rear end of the cylinder head 2 are connected by communication passages 24a and 24b provided along the width direction of the cylinder head 2, respectively. Branch passages 30a and 30b for supplying lubricating oil are connected to the cam bearings 26 and 28 provided in the two parts.
ところで、吸気側の支承部６と排気側の支承部８との間
の空間部（デッドスペース）１０には、上記主給油通路
２０ａ、２０ｂの上方に位置されて、シリンダへラド２
に一体形成された貯油室３２が設けられる。図示例の場
合では、貯油室３２は＃２気筒の点火プラグ挿入孔４と
＃３気筒の点火プラグ挿入孔４との間の空間部１０に設
けられ、この貯油室３２と２つの主給油通路２０ａ、２
０ｂとはそれぞれ個別に連通路３４ａ、３４ｂで接続さ
れている。By the way, in the space (dead space) 10 between the intake side support part 6 and the exhaust side support part 8, there is a rad 2 located above the main oil supply passages 20a, 20b to the cylinder.
An oil storage chamber 32 integrally formed with is provided. In the illustrated example, the oil storage chamber 32 is provided in the space 10 between the spark plug insertion hole 4 of the #2 cylinder and the spark plug insertion hole 4 of the #3 cylinder, and the oil storage chamber 32 is connected to the two main oil supply passages. 20a, 2
0b through communication passages 34a and 34b, respectively.
また、貯油室３２にはシリンダブロック３６側の給油通
路３８に連通ずる送油通路４０が接続されている。この
送油通路４０はシリンダヘッド２をシリンダブロック３
８に締結固定させるためのボルト孔４０ａと、このボル
ト孔４０ａを貫通してシリンダヘッド２の一側面からそ
の幅方向に沿って上記貯油室３２の真下まで穿設された
横孔４０ｂと、この横孔４０ｂと上記貯油室３２とを結
んでほぼ鉛直に穿設された縦孔４０ｃとからなり、上記
ボルト孔４０ａは締結ボルト４２の径に比して大きめに
あけられていて、ボルト孔４０ａとの間のクリアランス
が潤滑油の流路として利用され、ボルト孔４０ａの上端
部の開口は締結ボルト４２の頭部によって密封されるよ
うになっている。また、横孔４０ｂはその開口部がめく
ら蓋４４で閉塞されるようになっている。なお、上記シ
リンダヘッド２のボルト孔４０ａにはシリンダブロック
３６側のボルト孔４６を通じて図示していないオイルパ
ン内の潤滑油がオイルポンプで圧送されてくるようにな
っている。Further, an oil supply passage 40 is connected to the oil storage chamber 32 and communicates with an oil supply passage 38 on the cylinder block 36 side. This oil feed passage 40 connects the cylinder head 2 to the cylinder block 3.
8, a horizontal hole 40b that passes through the bolt hole 40a and is bored from one side of the cylinder head 2 along the width direction to just below the oil storage chamber 32; It consists of a vertical hole 40c bored almost vertically connecting the horizontal hole 40b and the oil storage chamber 32, and the bolt hole 40a is made larger than the diameter of the fastening bolt 42. The clearance between them is used as a flow path for lubricating oil, and the opening at the upper end of the bolt hole 40a is sealed by the head of the fastening bolt 42. Further, the opening of the horizontal hole 40b is closed with a blind lid 44. Note that lubricating oil in an oil pan (not shown) is pumped into the bolt hole 40a of the cylinder head 2 through a bolt hole 46 on the cylinder block 36 side by an oil pump.
また、貯油室３２の上端部はプラグ４８が螺合されて閉
塞されており、このプラグ４８には小径のエアー抜き孔
５０が穿設されている。Further, the upper end of the oil storage chamber 32 is closed by a plug 48 screwed together, and this plug 48 has a small diameter air vent hole 50 bored therein.
このよう、に構成される本実施例のＤＯＨＣエンジンの
シリンダヘッド構造では、オイルポンプで圧送される潤
滑油はシリンダブロック３６側のボルト孔４６の給油通
路３８を通じてシリンダヘッド２側のボルト孔４０ａに
導入され、このボルト孔４０ａから横孔４０ｂ及び縦孔
４０ｃを通じて貯油室３２内に流入する。そして、貯油
室３２内に流入した潤滑油は連通路３４ ａ、３４ ｂ
を介してこれより下方に位置して設けられている吸気側
及び排気側の２つの主給油通路２０ａ、２０ｂにそれぞ
れ流れ込み、分岐通路２２を通じて各収納孔１４内の油
圧バルブリフター１８に供給される。In the cylinder head structure of the DOHC engine of this embodiment configured as described above, the lubricating oil pumped by the oil pump passes through the oil supply passage 38 of the bolt hole 46 on the cylinder block 36 side and enters the bolt hole 40a on the cylinder head 2 side. The oil is introduced into the oil storage chamber 32 from the bolt hole 40a through the horizontal hole 40b and the vertical hole 40c. The lubricating oil that has flowed into the oil storage chamber 32 flows through communication passages 34 a and 34 b.
The oil flows into the two main oil supply passages 20a and 20b on the intake side and exhaust side provided below, respectively, and is supplied to the hydraulic valve lifter 18 in each storage hole 14 through the branch passage 22. .
この際、オイルポンプから圧送されてくる潤滑油内には
エアーが混入しているが、この混入したエアーは貯油室
３２内の上部に溜り、その貯油室３２の上端部のプラグ
４８に形成したエアー抜き孔５０から外部に排出される
。このため、貯油室３２より下流側の主給油通路２０ａ
、２Ｏｂ内に流れ込む潤滑油からはエアーが可及的に除
去されている。At this time, air is mixed in the lubricating oil pumped from the oil pump, but this mixed air accumulates in the upper part of the oil storage chamber 32 and is formed in the plug 48 at the upper end of the oil storage chamber 32. The air is discharged to the outside from the air vent hole 50. Therefore, the main oil supply passage 20a downstream of the oil storage chamber 32
, 2Ob, air is removed as much as possible from the lubricating oil flowing into the lubricating oil.
一方、エンジンの停止にともなってオイルポンプの作動
が止まると、潤滑油はその自重によって徐々にオイルパ
ン内に流下していくが、貯油室３２より下流側でかつこ
の貯油室３２よりも下方に位置された給油通路２０ａ、
２０ｂと連通路３４ａ、３４ｂ内の潤滑油はほとんど流
下しない。このため、貯油室３２から上流側の潤滑油が
流下してその貯油室３２と縦孔４０ｃ及び横孔４０ｂな
いしボルト孔４０ａ内にエアーが入込んでも、貯油室３
２より下流側の連通路３４ａ、３４ｂ及び主給油通路２
０ａ、２Ｏｂ内にはエアーは侵入しない。そして、再び
オイルポンプの作動によって潤滑油が貯油室３２内に圧
送されてくると、そのボルト孔４０ａと横孔４０ｂ及び
縦孔４０ｃないし貯油室３２内に侵入したエアーはぞの
貯油室３２の上端部のエアー抜き孔５０から外部に排出
されていく。On the other hand, when the oil pump stops operating as the engine stops, the lubricating oil gradually flows down into the oil pan due to its own weight. The located oil supply passage 20a,
The lubricating oil in the communication passages 20b and the communication paths 34a and 34b hardly flows down. Therefore, even if the lubricating oil on the upstream side flows down from the oil storage chamber 32 and air enters into the oil storage chamber 32, the vertical hole 40c, the horizontal hole 40b, or the bolt hole 40a, the oil storage chamber 32
Communication passages 34a, 34b on the downstream side of 2 and the main oil supply passage 2
Air does not enter into 0a and 2Ob. Then, when the lubricating oil is pumped into the oil storage chamber 32 again by the operation of the oil pump, the air that has entered the oil storage chamber 32 through the bolt hole 40a, horizontal hole 40b, vertical hole 40c, and inside the oil storage chamber 32. The air is discharged to the outside from the air vent hole 50 at the upper end.
従って、エンジンの再始動時においても主給油通路２０
ａ、２Ｏｂ内には潤滑油が滞留されたままになっている
ので、その再始動時の初期に油圧バルブリフター１８内
にエアーが吸入される虞はなく、またオイルポンプの作
動中にあっても貯油室の下流側の主給油通路２０ａ、２
Ｏｂ内にエアーが混入して潤滑油と共にエアーが油圧バ
ルブリフター１８内に吸込まれることが可及的に防止さ
れる。Therefore, even when restarting the engine, the main oil supply passage 20
Since the lubricating oil remains in a and 2Ob, there is no risk of air being sucked into the hydraulic valve lifter 18 at the initial stage of restarting, and there is no risk of air being sucked into the hydraulic valve lifter 18 while the oil pump is operating. Main oil supply passages 20a, 2 on the downstream side of the oil storage chamber
Air is prevented from getting mixed into Ob and being sucked into the hydraulic valve lifter 18 together with the lubricating oil as much as possible.
また、主給油通路２０ａ、２０ｂはシリンダヘッド２の
内側に位置させて油圧バルブリフター１８の収納孔１４
と点火プラグ挿通孔４との間の各支承部６，８に配置し
、貯油室３２は各支承部６゜８間の空間部１０に設ける
ので、シリンダヘッド２を幅方向に大型化させることな
く可及的にコンパクトに形成できる。しかもエアー抜き
構造を有する貯油室３２は吸・排気側の主給油通路２０
ａ。Moreover, the main oil supply passages 20a and 20b are located inside the cylinder head 2, and are located in the storage hole 14 of the hydraulic valve lifter 18.
and the spark plug insertion hole 4, and the oil storage chamber 32 is provided in the space 10 between the respective support parts 6° and 8. Therefore, the cylinder head 2 can be made larger in the width direction. It can be made as compact as possible. Moreover, the oil storage chamber 32 having an air vent structure is connected to the main oil supply passage 20 on the intake/exhaust side.
a.
２０ｂで共用して１箇所に設けるだけですむ。このため
、そのエアー抜き構造が従来に比して簡略化され、その
加工コストの低減化を計ることができるようになる。ま
たさらに、シリンダヘッド２の両側の吸・排気側動弁機
構の支承部６，８間の空間部１０に、そのシリンダヘッ
ド２に一体化させて貯油室３２を形成するので、シリン
ダヘッド２自体の剛性をも向上させることができる。It is only necessary to share it with 20b and install it in one place. Therefore, the air venting structure is simplified compared to the conventional one, and the processing cost can be reduced. Furthermore, since the oil storage chamber 32 is formed integrally with the cylinder head 2 in the space 10 between the support parts 6 and 8 of the intake/exhaust valve mechanism on both sides of the cylinder head 2, the cylinder head 2 itself It is also possible to improve the rigidity of the
なお、本実施例では油圧バルブリフター１８の収納孔１
４がバルブステムの直上に配置されている直動型のＤＯ
ＨＣエンジンのシリンダヘッド２を例示したが、本発明
はこれに限定されることはなく、例えばスウィングアー
ム式の動弁機構を備えて、油圧バルブリフターの収納孔
がバルブステムの軸芯から離れて設けられたＤＯＨＣエ
ンジンのシリンダヘッドにも適用できる。そしてこの場
合には、油圧バルブリフターの収納孔はシリンダヘッド
の内側に位置させて冬服・排気側動弁機構の支承部に設
けるようにする。In addition, in this embodiment, the storage hole 1 of the hydraulic valve lifter 18
4 is a direct acting type DO that is placed directly above the valve stem.
Although the cylinder head 2 of an HC engine is illustrated, the present invention is not limited thereto. For example, if a swing arm type valve mechanism is provided, and the housing hole of the hydraulic valve lifter is separated from the axis of the valve stem, the present invention is not limited to this. It can also be applied to the cylinder head of a DOHC engine. In this case, the housing hole for the hydraulic valve lifter is located inside the cylinder head and provided in the support part of the winter clothing/exhaust side valve mechanism.
（効 果）
以上要するに本発明によれば、主給油通路よりも上方に
位置されてシリンダヘッドに一体的に貯油室が形成され
、この貯油室を経由して前記主給油通路内にシリンダブ
ロック側の給油通路から潤滑油が送給される。そして潤
滑油中に混入したエアーは貯油室の上部に設けたエアー
抜き孔から上部に排出されるので、主給油通路にエアー
が混入することを可及的に防止することができる。また
オイルポンプの作動が停止されても主給油通路内に潤滑
油を滞留させて保持することができので、主給油通路内
にエアーが混入することを絶えず防止することができ、
エンジンの再始動時の初期においても油圧バルブリフタ
ー内にエアーが吸入される虞がない。さらに、主給油通
路はシリンダヘッドの内側に位置させて吸・排気側動弁
機構の各支承部に形成し、貯油室はその各支承部間のプ
ツトスペースに位置させてシリンダヘッドに一体形成す
るので、吸・排気側の主給油通路のエアー抜き構造を１
つの貯油室で共用させることができ、そのエアー抜き構
造を簡略化させてシリンダヘッドの幅を可及的にコンパ
クトに形成できる。(Effects) In short, according to the present invention, an oil storage chamber is formed integrally with the cylinder head and is located above the main oil supply passage, and the oil is supplied to the cylinder block side into the main oil supply passage via this oil storage chamber. Lubricating oil is supplied from the oil supply passage. Since the air mixed in the lubricating oil is discharged upward from the air vent hole provided in the upper part of the oil storage chamber, it is possible to prevent air from entering the main oil supply passage as much as possible. In addition, even if the oil pump stops operating, the lubricating oil can be retained in the main oil supply passage, so it is possible to constantly prevent air from entering the main oil supply passage.
There is no risk of air being sucked into the hydraulic valve lifter even at the initial stage of restarting the engine. Furthermore, the main oil supply passage is located inside the cylinder head and is formed in each support part of the intake and exhaust valve mechanism, and the oil storage chamber is located in the put space between each support part and is integrally formed with the cylinder head. , the air vent structure of the main oil supply passage on the intake/exhaust side is 1.
The cylinder head can be shared by two oil storage chambers, and its air vent structure can be simplified to make the width of the cylinder head as compact as possible.
第１図は本発明に係るＤＯＨＣエンジンのシリンダヘッ
ド構造の好適な一実施例を示す平面図、第２図は第１図
中の■−■線矢視断面図である。
２・・・・・・シリンダヘッド
４・・・・・・点火プラグ挿入孔
６・・・・・・吸気側動弁機構の支承部８・・・・・・
排気側動弁機構の支承部１０・・・・・・空間部
１４・・・・・・収納孔
１８・・・・・・油圧バルブリフター
２０ａ、２０ｂ・・・・・・主給油通路３２・・・・・
・貯油室
３４ａ、３４ｂ・・・・・・連通路
３８・・・・・・シリンダブロック側の給油通路４０・
・・・・・送油通路
５０・・・・・・エアー抜き孔
特 許 出 願 人 マツダ 株式会社代 理
人 弁理士 −色 健輔同 弁理
士 松本 雅利FIG. 1 is a plan view showing a preferred embodiment of a cylinder head structure for a DOHC engine according to the present invention, and FIG. 2 is a sectional view taken along the line ■-■ in FIG. 2... Cylinder head 4... Spark plug insertion hole 6... Support part 8 of the intake side valve mechanism...
Support part 10 of exhaust side valve mechanism...Space part 14...Storage hole 18...Hydraulic valve lifter 20a, 20b...Main oil supply passage 32...・・・・・・
・Oil storage chambers 34a, 34b...Communication passage 38...Oil supply passage 40 on the cylinder block side.
...Oil feed passage 50...Air vent hole Patent Applicant Mazda Co., Ltd. Agent
People Patent Attorney - Kensuke Iro Patent Attorney Masatoshi Matsumoto
Claims (1)
の支承部と排気側動弁機構の支承部との間に空間部を有
し、前記各支承部はそれぞれ各気筒毎に吸気側及び排気
側動弁機構の油圧バルブリフターを収納する収納孔及び
カム軸受部より構成され、前記各支承部にはその収納孔
に連通して油圧バルブリフターに潤滑油を供給する主給
油通路がその長手方向に沿って吸気側と排気側に各々形
成されたＤＯＨＣエンジンのシリンダヘッドにおいて、
前記主給油通路を各支承部のシリンダヘッドの内側に位
置させて形成するとともに、各支承部間の空間部には前
記給油通路よりも上方に位置させてシリンダヘッドに一
体的に形成した貯油室を設け、該貯油室にはシリンダブ
ロック側の給油通路に連通する送油通路と前記各主給油
通路に連通する連通路とを接続させ、かつ貯油室の上部
にはエアー抜き孔を備えるプラグを設けたことを特徴と
するＤＯＨＣエンジンのシリンダヘッド構造。A space is provided between the support part of the intake side valve mechanism and the support part of the exhaust side valve mechanism, which are formed along the longitudinal direction of the engine. It is composed of a housing hole for housing the hydraulic valve lifter of the exhaust side valve mechanism and a cam bearing part, and each of the bearing parts has a main oil supply passage along its length that communicates with the housing hole and supplies lubricating oil to the hydraulic valve lifter. In the cylinder head of a DOHC engine, which is formed on the intake side and the exhaust side along the direction,
The main oil supply passage is formed by being located inside the cylinder head of each support part, and an oil storage chamber is formed integrally with the cylinder head and located above the oil supply passage in the space between each support part. The oil storage chamber is provided with an oil supply passage that communicates with the oil supply passage on the cylinder block side and a communication passage that communicates with each of the main oil supply passages, and a plug with an air vent hole is provided in the upper part of the oil storage chamber. The cylinder head structure of a DOHC engine is characterized by the following:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8143188A JP2815861B2 (en) | 1988-04-04 | 1988-04-04 | DOHC engine cylinder head structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8143188A JP2815861B2 (en) | 1988-04-04 | 1988-04-04 | DOHC engine cylinder head structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01253552A true JPH01253552A (en) | 1989-10-09 |
| JP2815861B2 JP2815861B2 (en) | 1998-10-27 |
Family
ID=13746193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8143188A Expired - Lifetime JP2815861B2 (en) | 1988-04-04 | 1988-04-04 | DOHC engine cylinder head structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2815861B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4428681A1 (en) * | 1993-09-30 | 1995-04-06 | Suzuki Motor Co | Structure of a cylinder head assembly |
-
1988
- 1988-04-04 JP JP8143188A patent/JP2815861B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4428681A1 (en) * | 1993-09-30 | 1995-04-06 | Suzuki Motor Co | Structure of a cylinder head assembly |
| US5507259A (en) * | 1993-09-30 | 1996-04-16 | Suzuki Motor Corporation | Structure of cylinder head assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2815861B2 (en) | 1998-10-27 |
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