JP2002195042A - Structure of cylinder fuel injection type internal- combustion engine - Google Patents
Structure of cylinder fuel injection type internal- combustion engineInfo
- Publication number
- JP2002195042A JP2002195042A JP2000398300A JP2000398300A JP2002195042A JP 2002195042 A JP2002195042 A JP 2002195042A JP 2000398300 A JP2000398300 A JP 2000398300A JP 2000398300 A JP2000398300 A JP 2000398300A JP 2002195042 A JP2002195042 A JP 2002195042A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- fuel injection
- fuel
- valve
- injection valve
- 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
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
- F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
- F02B23/104—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder the injector being placed on a side position of the cylinder
-
- 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
- F02B75/12—Other methods of operation
- F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、燃料をシリンダ内
に直接的に噴射供給するようにした筒内燃料噴射型内燃
機関の構造に関するものである。The present invention relates to a structure of an in-cylinder fuel injection type internal combustion engine in which fuel is directly injected and supplied into a cylinder.
【０００２】[0002]
【従来の技術】この種の筒内燃料噴射型の内燃機関に
は、燃料の噴射供給を、吸気行程中において行うことに
よって、均一な混合気を形成して、点火栓にて燃焼する
方式（均質燃焼方式）のものと、燃料の噴射供給を、圧
縮行程の末期において行うことによって、点火栓の付近
に混合気を層状に形成して燃焼する方式（成層燃焼方
式）のもの、更には、前記均質燃焼方式と成層燃焼方式
とを併用したものとが存在する。2. Description of the Related Art In an in-cylinder fuel injection type internal combustion engine, a uniform fuel-air mixture is formed by performing fuel injection during an intake stroke, and the fuel is combusted by an ignition plug. (Homogeneous combustion system), and fuel injection and supply performed at the end of the compression stroke to form a stratified mixture in the vicinity of the ignition plug (stratified combustion system). There is a combination of the homogeneous combustion system and the stratified combustion system.
【０００３】このいずれの場合においても、ピストンの
頂面に、キャビティを凹み形成し、燃料をこのキャビテ
ィ内に向かって噴射することによって、ピストンが上死
点に来たとき、点火栓の回りに燃料を可及的に多く集め
るように構成しているが、このようにピストンの頂面に
キャビティを凹み形成することは、ピストンが上死点に
達したときにおける燃焼室の内容積が、キャビティの内
容積だけ増大することになるから、所定の圧縮比を得る
ことができないことになるし、また、キャビティを凹み
形成することによってピストンの表面積が増大するの
で、熱損失が大きくなり、熱効率の低下を招来すること
にもなる。[0003] In each case, a cavity is formed in the top surface of the piston, and fuel is injected into the cavity so that when the piston reaches the top dead center, around the spark plug. Although it is configured to collect as much fuel as possible, forming the cavity in the top surface of the piston in this way reduces the internal volume of the combustion chamber when the piston reaches the top dead center. Therefore, the predetermined compression ratio cannot be obtained, and the surface area of the piston is increased by forming the cavity, so that the heat loss is increased and the heat efficiency is increased. It also leads to a decline.
【０００４】そこで、先行技術としての特開２０００−
１０４５５０号公報は、ピストンの頂面の左右両側に、
左右一対の衝立部を設けて、この両衝立部の間に、凹み
溝を、シリンダの軸線方向から見て燃料噴射弁における
燃料噴射の方向に延びるように形成し、この凹み溝内に
おける一端部に、燃料噴射弁からの燃料を、当該凹み溝
が延びる方向に噴射することにより、前記キャビティに
よる欠点を改善することを提案している。Therefore, Japanese Patent Application Laid-Open No. 2000-2000 discloses a prior art.
No. 104550 discloses that the left and right sides of the top surface of the piston are
A pair of left and right partitions is provided, and a recessed groove is formed between the two partitions so as to extend in the direction of fuel injection in the fuel injection valve when viewed from the axial direction of the cylinder, and one end in the recessed groove is formed. In addition, it has been proposed that fuel from a fuel injection valve is injected in a direction in which the concave groove extends, thereby improving a defect caused by the cavity.
【０００５】[0005]
【発明が解決しようとする課題】しかし、この先行技術
のように構成した場合、凹み溝内の一端部に、当該凹み
溝が延びる方向に噴射された燃料におけるその噴射方向
と直角への広がりは、両衝立部に阻止することができる
ものの、噴射燃料の大部分は、噴射時の勢いをもったま
ま前記凹み溝内を他端部に向かって吹き抜けて、反対側
におけるシリンダの内面に付着するおそれが大きくな
り、その結果、点火栓の回りに集めることができる燃料
が少なくなるという問題があった。However, in the case of this prior art, the fuel injected in the direction in which the concave groove extends at one end in the concave groove has a spread perpendicular to the injection direction. Although most of the injected fuel can be blocked by the two partitions, most of the injected fuel blows through the recessed groove toward the other end while retaining the momentum during injection, and adheres to the inner surface of the cylinder on the opposite side. There has been a problem that the risk increases, and as a result, less fuel can be collected around the spark plug.
【０００６】本発明は、この先行技術のものが有する前
記問題を解消することを技術的課題とするものである。An object of the present invention is to solve the above-mentioned problems of the prior art.
【０００７】[0007]
【課題を解決するための手段】この技術的課題を達成す
るため本発明の請求項１は、「ピストンが往復動するシ
リンダの頂部におけるシリンダヘッドに、点火栓、吸気
弁及び排気弁を装着するとともに、先端部に燃料を前記
シリンダ内に斜め下向きに噴出する噴孔を有する燃料噴
射弁を、その先端部がシリンダの内面に近い部位におい
てシリンダ内にのぞむように装着して成る筒内燃料噴射
型内燃機関において、前記ピストンの頂面に、左右両側
からの登り勾配を有する二つの傾斜面をシリンダの軸線
方向から見て前記燃料噴射弁における燃料噴射の方向と
直角の方向に一直線状に延びる稜線において交わるよう
にした山形部を設け、この山形部における両傾斜面のう
ち前記燃料噴射弁側における一つの傾斜面の中腹部に、
前記燃料噴射弁からの噴射燃料が当たるように構成する
一方、前記山形部に、その稜線を横断する方向に延びて
前記両傾斜面を連通する凹み溝を、当該山形部における
稜線の両端に衝立部を残すように設けたことを特徴とす
る。」ものである。In order to achieve this technical object, a first aspect of the present invention is to provide a cylinder head at the top of a cylinder in which a piston reciprocates, which is provided with a spark plug, an intake valve, and an exhaust valve. In-cylinder fuel injection having a fuel injection valve having a nozzle at its tip for injecting fuel obliquely downward into the cylinder, with the tip of the fuel injection valve being viewed in the cylinder at a position near the inner surface of the cylinder. In the internal combustion engine, on the top surface of the piston, two inclined surfaces having ascending slopes from both the left and right sides extend in a straight line in a direction perpendicular to the direction of fuel injection at the fuel injection valve when viewed from the axial direction of the cylinder. A chevron is provided so as to intersect at the ridge line, and of the two slopes of the chevron, at the middle of one slope on the fuel injection valve side,
While the injection fuel from the fuel injection valve is configured to hit the same, the concave portion extending in the direction traversing the ridge line and communicating the two inclined surfaces is formed on the chevron portion at both ends of the ridge line in the chevron portion. It is characterized by being provided so as to leave a part. Is the thing.
【０００８】また、請求項２は、「前記請求項１の記載
において、前記シリンダの軸線を挟んで前記燃料噴射弁
側に吸気弁を、他方側に排気弁を各々配設する一方、前
記山形部における両傾斜面を、前記吸気弁及び排気弁の
先端面と略平行にして、その間に、ピストン上死点の位
置において吸気弁及び排気弁が開くことを許容するよう
にした隙間を形成したことを特徴とする。」ものであ
る。According to a second aspect of the present invention, in the first aspect, the intake valve is disposed on the fuel injection valve side and the exhaust valve is disposed on the other side with respect to the axis of the cylinder. The two inclined surfaces in the portion were substantially parallel to the tip surfaces of the intake valve and the exhaust valve, and a gap was formed between the inclined surfaces to allow the intake valve and the exhaust valve to open at the position of the piston top dead center. It is characterized by that. "
【０００９】[0009]
【発明の作用・効果】この構成において、燃料噴射弁に
おける噴孔より噴射された燃料は、山形部における一方
の傾斜面に当たり、次いで、凹み溝内に、当該凹み溝が
延びる方向に導かれることになる。In this configuration, the fuel injected from the injection hole of the fuel injection valve hits one inclined surface of the chevron, and is then guided into the concave groove in the direction in which the concave groove extends. become.
【００１０】この場合において、噴射燃料が当たる一方
の傾斜面は、登り勾配であることにより、この登り勾配
の傾斜面への吹き当たりにより、その噴射の勢いがある
程度弱められることになる。[0010] In this case, the one inclined surface to which the injected fuel is applied has an uphill slope, and the momentum of the injection is weakened to some extent by the hitting of the uphill slope.
【００１１】つまり、燃料噴射弁より噴射された燃料
を、その噴射の勢いを前記一方の傾斜面にてある程度弱
めたのち凹み溝内に導入することができるから、噴射燃
料のうち凹み溝内を吹き抜けて反対側におけるシリンダ
の内面に付着するものを確実に少なくすることができる
のである。In other words, the fuel injected from the fuel injection valve can be introduced into the concave groove after the momentum of the injection is reduced to some extent by the one inclined surface, so that the fuel injected into the concave groove is injected into the concave groove. It is possible to surely reduce the amount of air that blows through and adheres to the inner surface of the cylinder on the opposite side.
【００１２】ところで、この種の内燃機関においては、
ピストンが上死点に位置した状態で、吸気弁及び排気弁
を開くように構成することが必要てあり、このために、
ピスト側には、その上死点位置での吸気弁及び排気弁の
開を許容するバルブリセスを凹み形成しているが、この
バルブリセスを設けることでピストンの表面積が広くな
るから、熱損失が大きくなり、熱効率の低下を招来する
ことになる。By the way, in this type of internal combustion engine,
It is necessary to configure the intake valve and the exhaust valve to be opened with the piston located at the top dead center.
On the piston side, a valve recess is formed to allow the intake and exhaust valves to open at the top dead center position.However, providing this valve recess increases the surface area of the piston, thus increasing heat loss. This leads to a decrease in thermal efficiency.
【００１３】これに対して、請求項２に記載したように
構成することにより、ピストン側に吸気弁及び排気弁に
対するバルブリセスを設けることを省略できるから、ピ
ストンの表面積が広くなることによる熱損失の増大、ひ
いては熱効率の低下を確実に低減できるのである。[0013] On the other hand, according to the second aspect of the present invention, it is possible to omit the provision of the valve recesses for the intake valve and the exhaust valve on the piston side. The increase and, consequently, the decrease in thermal efficiency can be reliably reduced.
【００１４】[0014]
【発明の実施の形態】以下、本発明の実施の形態を、均
質燃焼方式に適用した場合を示す図１〜図４の図面につ
いて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to FIGS.
【００１５】この図において、符号１は、シリンダ２を
有するシリンダブロックを、符号３は、前記シリンダブ
ロック１の上面に前記シリンダ２を塞ぐように締結した
シリンダヘッドを各々示し、前記シリンダヘッド３の下
面のうち前記シリンダ２の部分には燃焼室４が凹み形成
されている。In this figure, reference numeral 1 denotes a cylinder block having a cylinder 2, and reference numeral 3 denotes a cylinder head fastened to the upper surface of the cylinder block 1 so as to close the cylinder 2. A combustion chamber 4 is recessed in the cylinder 2 on the lower surface.
【００１６】また、前記シリンダヘッド３のうち前記シ
リンダ２の軸線２ａを挟んで一方側には、前記燃焼室４
への開口部に吸気弁５を備えた二つの吸気ポート６が、
他方側には、同じく前記燃焼室４への開口部に排気弁７
を備えた二つの排気ポート８とが設けられ、且つ、前記
二つの吸気弁５と二つの排気弁７との間の部位、つま
り、シリンダ２の略中心の部位には、点火栓９が燃焼室
４内にのぞむように装着されている。One side of the cylinder head 3 across the axis 2a of the cylinder 2 is provided with the combustion chamber 4
Two intake ports 6 with intake valves 5 in the openings to
On the other side, an exhaust valve 7 is also provided at the opening to the combustion chamber 4.
Are provided, and a spark plug 9 is provided at a portion between the two intake valves 5 and the two exhaust valves 7, that is, at a substantially central portion of the cylinder 2. It is installed so as to look into the room 4.
【００１７】符号１０は、前記シリンダ２内のピストン
１１が下降動する吸気行程中においてシリンダ２内に燃
料噴射するようにした燃料噴射弁を示し、この燃料噴射
弁１０は、前記シリンダヘッド３のうち、前記シリンダ
２の軸線２ａの方向から見た平面視（図２）において前
記両吸気弁５間の部分で、且つ、側面視（図１）におい
て前記吸気ポート６とシリンダヘッド３の下面との間の
部位に、当該燃料噴射弁１０における先端部１０ａを前
記シリンダ２の内周面に近い部位においてシリンダ２内
にのぞませるように装着されており、しかも、この燃料
噴射弁１０は、その軸線１０ｂが、平面視（図２）にお
いて前記シリンダ２の中心Ｏ又は略中心に向かう方向
で、且つ、側面視（図１）において前記シリンダ２の軸
線２ａに対して外向きに傾斜するようにしてシリンダヘ
ッド３に装着されている。Reference numeral 10 denotes a fuel injection valve for injecting fuel into the cylinder 2 during an intake stroke in which the piston 11 in the cylinder 2 moves downward. The portion between the intake valves 5 in a plan view (FIG. 2) viewed from the direction of the axis 2 a of the cylinder 2 and the lower surface of the cylinder head 3 in the side view (FIG. 1). The fuel injection valve 10 is mounted so that the tip 10a of the fuel injection valve 10 can be seen inside the cylinder 2 at a position near the inner peripheral surface of the cylinder 2. The axis 10b is directed in a direction toward the center O or substantially the center of the cylinder 2 in plan view (FIG. 2), and outwardly with respect to the axis 2a of the cylinder 2 in side view (FIG. 1). It is mounted on the cylinder head 3 so as to tilt in.
【００１８】この燃料噴射弁１０における先端部１０ａ
には、燃料を、矢印Ａで示すように、前記シリンダ２の
軸線２ａに対して適宜角度θで斜め下向きに噴射するよ
うにした噴孔（図示せず）が穿設されている。The tip 10a of the fuel injection valve 10
Is provided with an injection hole (not shown) for injecting fuel obliquely downward at an appropriate angle θ with respect to the axis 2a of the cylinder 2 as shown by an arrow A.
【００１９】前記シリンダ２内を往復動する前記ピスト
ン１１の頂面１１ａには、左右両側からの比較的緩やか
な登り勾配を有する二つの傾斜面１３，１４をシリンダ
２の軸線２ａ方向から見て前記燃料噴射弁１０における
燃料噴射の方向と直角の方向に一直線状に延びる稜線１
５において交わるようにした山形部１２を一体的に設
け、この山形部１２における両傾斜面１３，１４のうち
前記燃料噴射弁１０側における一つの傾斜面１３の中腹
部に、前記燃料噴射弁１０から矢印Ａで示すように噴射
される燃料が当たるように構成する。On the top surface 11a of the piston 11 reciprocating in the cylinder 2, two inclined surfaces 13, 14 having a relatively gentle ascending slope from both the left and right sides are viewed from the direction of the axis 2a of the cylinder 2. A ridgeline 1 extending straight in a direction perpendicular to the direction of fuel injection in the fuel injection valve 10
5, the angled portion 12 that intersects at 5 is integrally provided. Of the two inclined surfaces 13, 14 of the angled portion 12, the fuel injection valve 10 , So that the fuel injected as shown by the arrow A from FIG.
【００２０】一方、前記山形部１２には、その稜線１５
を横断する方向に延びて前記両傾斜面１３，１４を連通
する凹み溝１６を、当該山形部１２における稜線１５の
両端に衝立部１７を残すように設ける。On the other hand, the chevron 12 has a ridge 15
Are provided so as to extend in the direction crossing the vertical direction and communicate the two inclined surfaces 13 and 14 at both ends of the ridgeline 15 in the angled portion 12 so as to leave the partition portions 17.
【００２１】また、前記山形部１２における両傾斜面１
３，１４を、前記両吸気弁５の先端面５ａ及び両排気弁
７の先端面７ａと略平行にする一方、前記両傾斜面１
３，１４と、両吸気弁５の先端面５ａ及び両排気弁７の
先端面７ａとの間に、ピストン１１が二点鎖線で示す上
死点に位置する状態で、前記両吸気弁５及び両排気弁７
が開き得るようにした隙間を形成する。Further, both inclined surfaces 1 of the chevron 12
3 and 14 are made substantially parallel to the front end face 5a of both intake valves 5 and the front end face 7a of both exhaust valves 7, while the two inclined faces 1
In the state where the piston 11 is located at the top dead center indicated by the two-dot chain line between the front end faces 5a of the intake valves 5 and the front end faces 7a of the exhaust valves 7, Both exhaust valves 7
To form a gap that can be opened.
【００２２】この構成において、燃料噴射弁１０の先端
部１０ａにおける噴孔より矢印Ａで示すように噴射され
た燃料は、山形部１２における一方の傾斜面１３に当た
り、次いで、凹み溝１６内に、当該凹み溝１６が延びる
方向に導かれる一方、この凹み溝１６内における横方向
への燃料の広がりは、両衝立部１７にて阻止できて、点
火栓９の回りに多くの燃料を集めることができる。In this configuration, the fuel injected from the injection hole at the tip end 10a of the fuel injection valve 10 as shown by the arrow A hits one inclined surface 13 of the chevron 12 and then enters the concave groove 16. While the groove 16 is guided in the extending direction, the spread of fuel in the groove 16 in the lateral direction can be prevented by the two partitions 17, so that a large amount of fuel can be collected around the ignition plug 9. it can.
【００２３】前記一方の傾斜面１３は、登り勾配である
ことにより、この登り勾配の傾斜面１３への吹き当たり
によって、その噴射の勢いがある程度弱められることに
なるから、前記燃料噴射弁１０より噴射された燃料を、
その噴射の勢いを前記一方の傾斜面１３にてある程度弱
めたのち凹み溝１６内に導入することができるから、噴
射燃料のうち凹み溝１６内を吹き抜けて反対側における
シリンダ２の内面に付着するものを確実に少なくでき
る。Since the one inclined surface 13 has an uphill slope, the momentum of the injection is reduced to some extent by the blow of the uphill slope 13 against the inclined surface 13. The injected fuel
Since the momentum of the injection can be reduced to some extent by the one inclined surface 13 and then introduced into the concave groove 16, the injected fuel blows through the concave groove 16 and adheres to the inner surface of the cylinder 2 on the opposite side. Things can be reliably reduced.
【００２４】この場合において、前記凹み溝１６におけ
る底面１６ａを、水平面に対して一方の傾斜面１３から
他方の傾斜面１４に向かって比較的緩やかな角度αの登
り勾配を有する傾斜面に形成することにより、噴射燃料
の勢いをこの登り勾配の底面１６ａにて弱めることがで
きるから、反対側におけるシリンダ２の内面に対する燃
料付着防止の効果をより助長することができる。In this case, the bottom surface 16a of the concave groove 16 is formed as an inclined surface having a relatively gentle inclination α from one inclined surface 13 to the other inclined surface 14 with respect to the horizontal plane. Accordingly, the momentum of the injected fuel can be weakened at the bottom surface 16a of the upward slope, so that the effect of preventing fuel adhesion to the inner surface of the cylinder 2 on the opposite side can be further promoted.
【００２５】なお、本発明においては、成層燃焼方式に
適用することができることはいうまでもない。It is needless to say that the present invention can be applied to a stratified combustion system.
【図１】本発明の実施の形態を示す要部縦断正面図であ
る。FIG. 1 is a vertical sectional front view of a main part showing an embodiment of the present invention.
【図２】図１のII−II視平断面図である。FIG. 2 is a plan sectional view taken along line II-II of FIG.
【図３】図１のIII −III 視断面図である。FIG. 3 is a sectional view taken along line III-III in FIG.
【図４】ピストンの頂部を示す斜視図である。FIG. 4 is a perspective view showing a top of a piston.
１ シリンダブロック ２ シリンダ ２ａ シリンダの軸線 ３ シリンダヘッド ４ 燃焼室 ５ 吸気弁 ７ 排気弁 ９ 点火栓 １０ 燃料噴射弁 １０ａ 燃料噴射弁の先端部 １０ａ′ 噴孔 １１ ピストン １１ａ ピストンの頂面 １２ 山形部 １３，１４ 傾斜面 １５ 稜線 １６ 凹み溝 １７ 衝立部 DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Cylinder 2a Cylinder axis 3 Cylinder head 4 Combustion chamber 5 Intake valve 7 Exhaust valve 9 Ignition plug 10 Fuel injection valve 10a Top end of fuel injection valve 10a 'Injection hole 11 Piston 11a Top surface of piston 12 Peak portion 13 , 14 Inclined surface 15 Ridge line 16 Depression groove 17 Screen part
Claims (2)
けるシリンダヘッドに、点火栓、吸気弁及び排気弁を装
着するとともに、先端部に燃料を前記シリンダ内に斜め
下向きに噴出する噴孔を有する燃料噴射弁を、その先端
部がシリンダの内面に近い部位においてシリンダ内にの
ぞむように装着して成る筒内燃料噴射型内燃機関におい
て、 前記ピストンの頂面に、左右両側からの登り勾配を有す
る二つの傾斜面をシリンダの軸線方向から見て前記燃料
噴射弁における燃料噴射の方向と直角の方向に一直線状
に延びる稜線において交わるようにした山形部を設け、
この山形部における両傾斜面のうち前記燃料噴射弁側に
おける一つの傾斜面の中腹部に、前記燃料噴射弁からの
噴射燃料が当たるように構成する一方、前記山形部に、
その稜線を横断する方向に延びて前記両傾斜面を連通す
る凹み溝を、当該山形部における稜線の両端に衝立部を
残すように設けたことを特徴とする筒内燃料噴射型内燃
機関の構造。1. A fuel having a spark plug, an intake valve and an exhaust valve mounted on a cylinder head at the top of a cylinder in which a piston reciprocates, and having an injection hole at a tip end for injecting fuel obliquely downward into the cylinder. An in-cylinder fuel injection type internal combustion engine in which an injection valve is mounted such that its tip end is close to the inner surface of the cylinder and looks into the cylinder, wherein the top surface of the piston has an ascending slope from both left and right sides. When viewed from the axial direction of the cylinder, the two inclined surfaces are provided with a chevron portion that intersects at a ridge line that extends linearly in a direction perpendicular to the direction of fuel injection in the fuel injection valve,
Of the two inclined surfaces in the chevron, the fuel injection valve from the fuel injection valve hits the middle of one inclined surface on the fuel injection valve side, while the chevron,
A structure of an in-cylinder fuel injection type internal combustion engine, wherein a concave groove extending in a direction crossing the ridge line and communicating the two inclined surfaces is provided so as to leave partitions at both ends of the ridge line in the chevron. .
ダの軸線を挟んで前記燃料噴射弁側に吸気弁を、他方側
に排気弁を各々配設する一方、前記山形部における両傾
斜面を、前記吸気弁及び排気弁の先端面と略平行にし
て、その間に、ピストンの上死点の位置において吸気弁
及び排気弁の開を許容するようにした隙間を形成したこ
とを特徴とする筒内燃料噴射型内燃機関の構造。2. The fuel injection valve according to claim 1, wherein an intake valve is disposed on the fuel injection valve side and an exhaust valve is disposed on the other side with respect to the axis of the cylinder. A cylinder substantially parallel to the tip surfaces of the intake valve and the exhaust valve, and a gap formed between them so as to allow the intake valve and the exhaust valve to open at the position of the top dead center of the piston. Structure of internal fuel injection type internal combustion engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000398300A JP3637279B2 (en) | 2000-12-27 | 2000-12-27 | Structure of in-cylinder fuel injection internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000398300A JP3637279B2 (en) | 2000-12-27 | 2000-12-27 | Structure of in-cylinder fuel injection internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002195042A true JP2002195042A (en) | 2002-07-10 |
| JP3637279B2 JP3637279B2 (en) | 2005-04-13 |
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ID=18863296
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000398300A Expired - Fee Related JP3637279B2 (en) | 2000-12-27 | 2000-12-27 | Structure of in-cylinder fuel injection internal combustion engine |
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| Country | Link |
|---|---|
| JP (1) | JP3637279B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004065824A1 (en) | 2003-01-17 | 2004-08-05 | Nsk Ltd. | Worm wheel and method of manufacturing the worm wheel |
-
2000
- 2000-12-27 JP JP2000398300A patent/JP3637279B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004065824A1 (en) | 2003-01-17 | 2004-08-05 | Nsk Ltd. | Worm wheel and method of manufacturing the worm wheel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3637279B2 (en) | 2005-04-13 |
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