JP2000104624A - Engine cylinder head - Google Patents
Engine cylinder headInfo
- Publication number
- JP2000104624A JP2000104624A JP10271468A JP27146898A JP2000104624A JP 2000104624 A JP2000104624 A JP 2000104624A JP 10271468 A JP10271468 A JP 10271468A JP 27146898 A JP27146898 A JP 27146898A JP 2000104624 A JP2000104624 A JP 2000104624A
- Authority
- JP
- Japan
- Prior art keywords
- water
- cylinder head
- jacket
- ceiling
- engine
- 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
- 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
- F02F1/40—Cylinder heads having cooling means for liquid cooling cylinder heads with means for directing, guiding, or distributing liquid stream
-
- 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
- F02F1/242—Arrangement of spark plugs or injectors
-
- 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
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、エンジンのシリン
ダヘッドに関する。The present invention relates to a cylinder head for an engine.
【０００２】[0002]
【従来の技術】熱負荷の高い４弁ディーゼルエンジンに
おいてエキゾーストバルブシート部、インジェクタノズ
ル部の冷却は大変重要である。従来、特開平８−２８３
４５号公報にあるように、隔壁を設けて、冷却水の流れ
をエキゾーストバルブシート部、インジェクタノズル部
に導くことが知られている。2. Description of the Related Art In a four-valve diesel engine having a high heat load, cooling of an exhaust valve seat portion and an injector nozzle portion is very important. Conventionally, Japanese Patent Application Laid-Open No. 8-283
As disclosed in Japanese Patent Application Publication No. 45-45, it is known to provide a partition and guide the flow of cooling water to an exhaust valve seat portion and an injector nozzle portion.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来構造で
は、エンジン冷却水は通路断面積の広いジャケット天井
側を流れ、下面側にはほとんど流れない。実際に冷却し
たい部分は、シリンダヘッドのうち高温となる燃焼室に
近い部分であるので、ジャケット下面側での流速が低い
従来構造では効果的なシリンダヘッド冷却が得られな
い。本発明の目的は、エキゾーストバルブシート部、イ
ンジェクタノズル部の冷却において、熱負荷の高いウォ
ータジャケット下面側の冷却を促進できるエンジンのシ
リンダヘッドを提供することにある。However, in the conventional structure, the engine cooling water flows on the ceiling side of the jacket having a large passage cross-sectional area, and hardly flows on the lower side. The part to be actually cooled is a part of the cylinder head that is close to the combustion chamber where the temperature becomes high, so that the conventional structure in which the flow velocity on the lower surface side of the jacket is low cannot provide effective cylinder head cooling. An object of the present invention is to provide a cylinder head of an engine capable of promoting cooling of a lower surface side of a water jacket having a high heat load in cooling an exhaust valve seat portion and an injector nozzle portion.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成する本発
明は、つぎの通りである。気筒当たり４弁を有するシリ
ンダヘッドのウォータジャケットの少なくともエキゾー
ストポート側半分を上層ウォータジャケットと下層ウォ
ータジャケットとの２層構造とし、前記下層ジャケット
の天井をインジェクタまたは点火栓の取付部を構成する
円柱部の外周上で最も低くなるような円錐面に形成した
エンジンのシリンダヘッド。The present invention to achieve the above object is as follows. At least the exhaust port side half of the water jacket of the cylinder head having four valves per cylinder has a two-layer structure of an upper water jacket and a lower water jacket, and the ceiling of the lower jacket has a cylindrical portion forming a mounting portion of an injector or an ignition plug. Engine cylinder head formed on a conical surface that is lowest on the outer circumference of the engine.
【０００５】本発明のエンジンのシリンダヘッドでは、
ウォータジャケットを２層構造としたことにより、１層
構造でウォータジャケット上面側を流れていた冷却水を
ウォータジャケット下面側に引き寄せることができ、ウ
ォータジャケット下面側を冷却できる。また、下層ジャ
ケットの天井を円錐面に形成したので、インジェクタま
たは点火栓の取付部を構成する円柱部の周上で冷却水の
流速を高めることができ、熱伝達係数が大きくなり、イ
ンジェクタまたは点火栓の取付部を構成する円柱部の周
囲を効果的に冷却できる。[0005] In the engine cylinder head of the present invention,
Since the water jacket has a two-layer structure, the cooling water flowing on the upper surface side of the water jacket in the one-layer structure can be drawn to the lower surface side of the water jacket, and the lower surface side of the water jacket can be cooled. In addition, since the ceiling of the lower jacket is formed in a conical surface, the flow rate of the cooling water can be increased around the cylindrical portion constituting the mounting portion of the injector or the ignition plug, the heat transfer coefficient increases, and the injector or the ignition The periphery of the cylindrical portion constituting the mounting portion of the plug can be effectively cooled.
【０００６】[0006]
【発明の実施の形態】図１〜図４は本発明実施例のエン
ジン（ディーゼルエンジンでもガソリンエンジンでもよ
い）のシリンダヘッド１を示す。図２（図４のＡ−Ａ線
と、Ｂ−Ｂ線断面で、Ａ−Ａ線断面が下層ジャケットの
断面に対応し、Ｂ−Ｂ線断面が上層ジャケットに対応す
る）に示すように、エンジンシリンダヘッド１は多気筒
（図示例は４気筒の場合であるが、４気筒以外の多気筒
でもよい）エンジンのシリンダヘッドで、たとえばアル
ミ合金からなり、各気筒に４弁（２インテークバルブと
２エキゾーストバルブ）を有する。８ａ、８ｂは吸気ポ
ートであり、９ａ、９ｂは排気ポートである。４つのポ
ート８ａ、８ｂ、９ａ、９ｂで囲まれた部位には、ディ
ーゼルエンジンの場合にはインジェクタノズル取付け用
の穴部４（ガソリンエンジンの場合には点火栓取付け用
の穴部４）が形成されている。４ａは穴部４をもつ円柱
部であり、４ｂは円柱部の外周面である。1 to 4 show a cylinder head 1 of an engine (either a diesel engine or a gasoline engine) according to an embodiment of the present invention. As shown in FIG. 2 (in the AA line and the BB line cross section in FIG. 4, the AA line cross section corresponds to the lower layer jacket cross section, and the BB line cross section corresponds to the upper layer jacket). The engine cylinder head 1 is a cylinder head of a multi-cylinder engine (in the illustrated example, there are four cylinders, but may be a multi-cylinder other than four cylinders). The cylinder head is made of, for example, an aluminum alloy. 2 exhaust valves). 8a and 8b are intake ports, and 9a and 9b are exhaust ports. In the region surrounded by the four ports 8a, 8b, 9a, 9b, a hole 4 for mounting an injector nozzle in the case of a diesel engine (a hole 4 for mounting a spark plug in the case of a gasoline engine) is formed. Have been. Reference numeral 4a denotes a column having a hole 4, and 4b denotes an outer peripheral surface of the column.
【０００７】図１はシリンダヘッド１を気筒中心を通り
長手方向に延びる面（図２のＣ−Ｃ）で切断して見た断
面図であり、図４はシリンダヘッド１を気筒中心を通り
長手方向と直交する方向に延びる面（図２のＥ−Ｅ）で
切断して見た断面図である。図１、図４に示すように、
シリンダヘッド１は、少なくともエキゾーストポート側
半分を上層ジャケットと下層ジャケットとの２層構造と
したウォータジャケット２、３を有する。図示例では、
エキゾーストポート側半分もインテークポート側半分
も、上下２層ウォータジャケット構造としてある。FIG. 1 is a sectional view of the cylinder head 1 taken along a plane (CC in FIG. 2) extending in the longitudinal direction passing through the center of the cylinder. FIG. 4 shows the cylinder head 1 extending longitudinally through the center of the cylinder. FIG. 3 is a cross-sectional view taken along a plane (EE in FIG. 2) extending in a direction perpendicular to the direction. As shown in FIGS. 1 and 4,
The cylinder head 1 has water jackets 2 and 3 in which at least a half on the exhaust port side has a two-layer structure of an upper layer jacket and a lower layer jacket. In the example shown,
Both the exhaust port side half and the intake port side half have a two-layer upper and lower water jacket structure.
【０００８】冷却水はウオータポンプ（図示せず）から
シリンダブロック（図示せず）に流入し、シリンダブロ
ックから水穴５、６、７を通ってシリンダヘッド１に流
入し、シリンダヘッドからラジエータへと流れる。水穴
６はシリンダヘッドの長手方向の水の流れの上流側に位
置する水穴であり、水穴５はシリンダヘッドのインテク
ポート側半分にある水穴であり、水穴７、７ａはシリン
ダヘッドのエキゾーストポート側半分にある水穴であ
る。図示例では水穴６はシリンダヘッド最上流部に設け
られているが、長手方向の途中で気筒間の部位にも追加
して設けられてもよい。水穴７、７ａのうち水穴７は最
上流にある水穴であり、水穴７ａは最上流以外にある水
穴である。水穴７の径は水穴７ａの径より大であるよう
に、ヘッドガスケットの穴が調整される。Cooling water flows from a water pump (not shown) into a cylinder block (not shown), flows from the cylinder block into the cylinder head 1 through water holes 5, 6, and 7, and from the cylinder head to the radiator. And flows. The water hole 6 is a water hole located on the upstream side of the flow of water in the longitudinal direction of the cylinder head, the water hole 5 is a water hole in the half of the cylinder head on the intec port side, and the water holes 7 and 7a are cylinder heads. It is a water hole in the exhaust port side half. In the illustrated example, the water hole 6 is provided at the most upstream portion of the cylinder head. However, the water hole 6 may be additionally provided at a portion between the cylinders in the longitudinal direction. Among the water holes 7, 7a, the water hole 7 is a water hole at the most upstream, and the water hole 7a is a water hole other than the most upstream. The hole of the head gasket is adjusted so that the diameter of the water hole 7 is larger than the diameter of the water hole 7a.
【０００９】下層ウォータジャケット３には、４つのポ
ート８ａ、８ｂ、９ａ、９ｂの壁で囲まれた部位に、上
流側から円柱部４に向かってエンジン長手方向に延びる
水路１０と、円柱部４の外周面４ａの沿ってエキゾース
トポート側に半円周状に延びる水路１１（断面積Ｓ1 ）
と、円柱部４から下流側に向かってエンジン長手方向に
延びる水路１０´と、からなる冷却水通路が形成されて
いる。この水路１０、１１、１０´は下層冷却水ジャケ
ット３の一部を構成している。エキゾーストポート９
ａ、９ｂの壁をつないでいる壁には、該壁を貫通し一端
が水路１１に開口する水路１２（断面積Ｓ2 ）が形成さ
れている。図２に示すように、水路１２は、水路１１か
らの水が流入しやすいようにエンジン長手方向に対し９
０°以下の角度で斜めに形成されている。The lower water jacket 3 includes a water passage 10 extending in the longitudinal direction of the engine from the upstream side toward the column 4 at a portion surrounded by walls of the four ports 8a, 8b, 9a, 9b. Channel 11 (cross-sectional area S 1 ) extending semicircularly to the exhaust port side along the outer peripheral surface 4a of
And a water passage 10 ′ extending in the longitudinal direction of the engine from the cylindrical portion 4 toward the downstream side. The water channels 10, 11, 10 'constitute a part of the lower cooling water jacket 3. Exhaust port 9
On the wall connecting the walls a and 9b, a water passage 12 (cross-sectional area S 2 ) penetrating the wall and having one end open to the water passage 11 is formed. As shown in FIG. 2, the water channel 12 has a width of 9 mm with respect to the longitudinal direction of the engine so that water from the water channel 11 can easily flow in.
It is formed obliquely at an angle of 0 ° or less.
【００１０】図１に示すように、下層ウォータジャケッ
ト３の天井３ａは、円柱部４ａの外周面４ｂ上で最も低
くなるような円錐面で構成されている。したがって、水
路１０の天井は上流側から円柱部４ａに向かって徐々に
低くなり、水路１１の天井は円柱部４ａの外周面４ｂ上
で一定であり、水路１０´の天井は円柱部４ａから下流
側に向かって徐々に高くなる。また、図３（図２のＤ−
Ｄ線断面）に示すように、水路１０´の天井よりは、エ
キゾーストポートの外側の水路１３の天井の方が（円錐
の中心から外側にあるので）高い。As shown in FIG. 1, the ceiling 3a of the lower water jacket 3 has a conical surface which is the lowest on the outer peripheral surface 4b of the cylindrical portion 4a. Therefore, the ceiling of the waterway 10 gradually lowers from the upstream side toward the cylindrical portion 4a, the ceiling of the waterway 11 is constant on the outer peripheral surface 4b of the cylindrical portion 4a, and the ceiling of the waterway 10 'is downstream from the cylindrical portion 4a. It gradually gets higher toward the side. FIG. 3 (D- of FIG. 2)
As shown in (D section), the ceiling of the water channel 13 outside the exhaust port is higher than the ceiling of the water channel 10 '(because it is located outside the center of the cone).
【００１１】天井高さの最下部を決める水路１１の断面
積Ｓ1 のとりかたであるが、流れの主流を水路１１にも
ってくるために、つぎのように決める。図２に示すよう
に、水穴６、７からの水が出ていく水路は、水路１０の
他に、ヘッドボルト１４とインテークポート８ａの壁間
の水路１５（断面積Ｓ3 ）と、エキゾーストポート９ａ
の壁とヘッドボルトボス１６から延びたリブ１７間の水
路１８（断面積Ｓ4 ）がある。さらには、シリンダヘッ
ド最後尾で上下ジャケット２、３をつなぐ幅木による隙
間１９もあるが、これはかなり小さく設定するのでここ
では無視する。Ｓ1 をＳ2 、Ｓ3 、Ｓ4 に対して Ｓ1 ≧Ｓ2 （ただしＳ1 がＳ2 に近づくようにＳ1 を絞
る。） Ｓ1 ＞２Ｓ3 （または、Ｓ1 ＞Ｓ3 ＋Ｓ4 ） Ｓ1 ＞２Ｓ4 と選定する。The method of setting the cross-sectional area S 1 of the water channel 11 that determines the lowest part of the ceiling height is determined as follows in order to bring the main flow into the water channel 11. As shown in FIG. 2, in addition to the water channel 10, the water channel from which the water from the water holes 6 and 7 flows out is a water channel 15 (cross-sectional area S 3 ) between the head bolt 14 and the wall of the intake port 8 a, and an exhaust Port 9a
There is a water channel 18 (cross-sectional area S 4 ) between the wall of the head and the rib 17 extending from the head bolt boss 16. Further, there is a gap 19 formed by a skirting board connecting the upper and lower jackets 2 and 3 at the rear end of the cylinder head. However, since this gap is set to be considerably small, it is ignored here. The S 1 S 2, S 3, S 1 ≧ S 2 relative to S 4 (provided that S 1 is squeeze S 1 so as to approach the S 2.) S 1> 2S 3 ( or, S 1> S 3 + S 4) selection and S 1> 2S 4.
【００１２】ウォータジャケットの天井に空気溜まりを
作らないようにするために、下層ウォータジャケット３
の天井には水穴２０を天井の最も高くなる部位に設けて
ある（図１、図２参照）。この水穴２０は、また、温度
上昇した冷却水を上層ジャケット２に逃がす働きを合わ
せもつ。水穴２０から流出した水量を補うように新たに
冷たい水を下面水穴７ａから供給することができる。In order to prevent the formation of air pockets on the ceiling of the water jacket, the lower water jacket 3
The ceiling has a water hole 20 at the highest point of the ceiling (see FIGS. 1 and 2). The water hole 20 also has the function of allowing the cooling water whose temperature has risen to escape to the upper jacket 2. Fresh cold water can be supplied from the lower surface water hole 7a so as to compensate for the amount of water flowing out from the water hole 20.
【００１３】冷却水ギャラリ２１は、図２、図３に示す
ように、インテークポート８（８ａ、８ｂ）の下方にあ
って、シリンダヘッド１の長手方向に延びている。ここ
へは、水穴５から水が流入してきて水穴２２から上層ウ
ォータジャケット２へ流出していく。水穴２２の流れで
グロープラグ２３部位の冷却をする。The cooling water gallery 21 extends below the intake ports 8 (8a, 8b) in the longitudinal direction of the cylinder head 1, as shown in FIGS. Here, water flows in from the water hole 5 and flows out from the water hole 22 to the upper water jacket 2. The glow plug 23 is cooled by the flow of the water hole 22.
【００１４】つぎに、本発明実施例の作用を説明する。
冷却水は下面水穴５、６、７（７ａ）を通ってシリンダ
ブロック（図示せず）から下層ウォータジャケット３へ
供給される。流量を決定するのは、ヘッドガスケット
（図示せず）の水穴径である。水穴６と水穴７からの流
量が多い。Next, the operation of the embodiment of the present invention will be described.
Cooling water is supplied from the cylinder block (not shown) to the lower water jacket 3 through the lower water holes 5, 6, 7 (7a). It is the water hole diameter of the head gasket (not shown) that determines the flow rate. The flow rate from the water holes 6 and 7 is large.
【００１５】水穴６と水穴７からの水はインテークポー
ト８ａとエキゾーストポート９ａの間の水路１０に集合
し、円柱部外周面４ａとエキゾーストポート９ａの間の
水路１１に近づくにつれて流速を上げ、水路１１に至っ
て流速を最も流速を上げる。これは、下層ウォータジャ
ケット３の天井下面３ａが円錐状とされているため、水
路１１に向かって水路断面積が徐々に絞られているから
である。この流速増加によって、円柱部外周面４ａ、エ
キゾーストポート９ａ、９ｂのまわりを効果的に冷却で
きる。The water from the water holes 6 and 7 collects in the water channel 10 between the intake port 8a and the exhaust port 9a, and the flow velocity increases as it approaches the water channel 11 between the outer peripheral surface 4a of the cylindrical portion and the exhaust port 9a. , Reaching the water channel 11 and increasing the flow velocity the most. This is because the lower surface of the ceiling 3a of the lower water jacket 3 has a conical shape, so that the cross-sectional area of the water channel is gradually narrowed toward the water channel 11. By this increase in the flow velocity, it is possible to effectively cool around the cylindrical portion outer peripheral surface 4a and the exhaust ports 9a and 9b.
【００１６】十分に流速を上げた水流はエキゾーストポ
ート９ａ、９ｂの間の水路１２に突入する。一般に水路
１２の断面積は小さく、従来では水路１１の流れはほと
んど水路１２に流れ込まないが、本発明実施例のように
Ｓ1 をＳ2 に近づける程に絞りこんで水路１０、１１で
流速を上げることにより、水路１２に流すことができ、
エキゾーストポート９ａ、９ｂの間を効果的に冷却する
ことができる。しかも、水路１２の軸線はシリンダヘッ
ド１の長手方向に対し９０°より小さい角度で交差する
ので、流れが水路１２に入り込みやすくなっている。こ
のようにして、熱負荷の高いエキゾーストポート９ａ、
９ｂや円柱部４の近傍を効果的に冷却することができ
る。The water flow having a sufficiently increased flow velocity enters the water passage 12 between the exhaust ports 9a and 9b. In general the cross-sectional area of the channel 12 is small, the flow of the waterway 11 in the conventional but not flow almost waterway 12, the flow rate at the water 10, 11 is narrowed down enough to approach the S 1 to S 2 as in the present invention embodiment By raising, it can be flowed into the water channel 12,
The space between the exhaust ports 9a and 9b can be effectively cooled. Moreover, since the axis of the water passage 12 intersects with the longitudinal direction of the cylinder head 1 at an angle smaller than 90 °, the flow easily enters the water passage 12. In this manner, the exhaust port 9a having a high heat load,
9b and the vicinity of the column portion 4 can be effectively cooled.
【００１７】一方、円錐面状天井３ａは、円柱部外周面
４ａから離れるほど天井高さを増すので、流路の抵抗を
下げる効果をもつ。ここで、水路１３は水路１２の下流
側になっていて、水路１３の断面積が小さいと水路１２
を閉塞する作用を生じるため本発明実施例のように水路
１３の天井が高くて水路が広いことは抵抗減少上都合が
よい。また、水路１１の断面積Ｓ1 を決める天井高さで
一様な平面天井を作るとすると、下層ウォータジャケッ
ト３を形成する中子は薄くて長いものになってしまい中
子自体の強度を落とし生産性が悪くなる。しかし、本発
明実施例では、円錐面状天井のため、中子の節となるボ
ア間部で十分な厚さとなることができるので、シリンダ
ヘッド鋳造上も望ましい。On the other hand, the conical ceiling 3a has an effect of lowering the resistance of the flow path because the ceiling height increases as the distance from the outer peripheral surface 4a of the cylindrical portion increases. Here, the water channel 13 is on the downstream side of the water channel 12, and if the cross-sectional area of the water channel 13 is small, the water channel 12
In order to reduce the resistance, it is advantageous for the ceiling of the water channel 13 to be high and the water channel to be wide as in the embodiment of the present invention. Also, dropping When making the ceiling height in a uniform plane ceiling which determines the cross-sectional area S 1 of the channel 11, the strength of the core itself becomes what longer core is thin to form the lower water jacket 3 Productivity decreases. However, in the embodiment of the present invention, since the conical ceiling is used, a sufficient thickness can be obtained at the portion between the bores that serve as the nodes of the core.
【００１８】また、Ｓ1 ≧Ｓ2 、Ｓ1 ＞２Ｓ3 、Ｓ1 ＞
２Ｓ4 （Ｓ1 ＞２Ｓ3 は、またＳ1＞Ｓ3 ＋Ｓ4 で置き
換えてもよい）と選定したので、流れの主流を水路１
０、１１にもってくることができる。円錐面状天井によ
って、下層ウォータジャケット３に凹凸ができるが、空
気抜きとなる水穴２０を天井の最も高くなる部位に設け
たので、空気が溜まることを防止できる。S 1 ≧ S 2 , S 1 > 2S 3 , S 1 >
2S 4 (S 1 > 2S 3 may also be replaced by S 1 > S 3 + S 4 ), so the main flow is channel 1
0 and 11 can be brought. The conical ceiling makes the lower water jacket 3 uneven, but since the water hole 20 for venting air is provided at the highest point of the ceiling, the accumulation of air can be prevented.
【００１９】一般に、インジェクタ底部にかかる燃焼圧
が円柱部４をもち上げると、円柱部４ａは上下ウォータ
ジャケット２、３の隔壁である天井に連結されているの
で、燃焼圧で天井の上面側で引張応力、下面側で圧縮応
力が生じる。しかし、本発明実施例では、円錐状の天井
としてあるので、上面側の引張応力が圧縮側へ移行し、
天井壁の疲労強度が向上し、シリンダヘッド１の耐久性
が向上する。In general, when the combustion pressure applied to the bottom of the injector raises the cylindrical portion 4, the cylindrical portion 4a is connected to the ceiling, which is the partition wall of the upper and lower water jackets 2, 3, so that the combustion pressure causes the upper surface of the ceiling to be closed. Tensile stress and compressive stress occur on the lower surface side. However, in the embodiment of the present invention, since the ceiling is a conical ceiling, the tensile stress on the upper surface shifts to the compression side,
The fatigue strength of the ceiling wall is improved, and the durability of the cylinder head 1 is improved.
【００２０】[0020]
【発明の効果】請求項１のエンジンのシリンダヘッドに
よれば、ウォータジャケットを２層構造としたことによ
り、１層構造でウォータジャケット上面側を流れていた
冷却水をウォータジャケット下面側に引き寄せることが
でき、ウォータジャケット下面側を冷却できる。また、
下層ジャケットの天井を円錐面に形成したので、インジ
ェクタまたは点火栓の取付部を構成する円柱部の周上で
冷却水の流速を高めることができ、熱伝達係数が大きく
なり、インジェクタまたは点火栓の取付部を構成する円
柱部の周囲を効果的に冷却できる。According to the engine cylinder head of the present invention, since the water jacket has a two-layer structure, the cooling water flowing on the upper surface of the water jacket in the one-layer structure is drawn to the lower surface of the water jacket. And the lower surface of the water jacket can be cooled. Also,
Because the ceiling of the lower jacket is formed as a conical surface, the flow rate of cooling water can be increased around the cylindrical portion that forms the mounting portion of the injector or the ignition plug, the heat transfer coefficient increases, and the The periphery of the cylindrical portion constituting the mounting portion can be effectively cooled.
【図１】本発明実施例のエンジンのシリンダヘッドの円
柱部近傍の（図２のＣ−Ｃ線に沿う）断面図である。FIG. 1 is a cross-sectional view (along line CC in FIG. 2) of the vicinity of a cylindrical portion of a cylinder head of an engine according to an embodiment of the present invention.
【図２】本発明実施例のエンジンのシリンダヘッドの
（図４のＡ−Ａ線とＢ−Ｂ線に沿う）断面図である。FIG. 2 is a cross-sectional view (along line AA and line BB in FIG. 4) of the cylinder head of the engine according to the embodiment of the present invention;
【図３】本発明実施例のエンジンのシリンダヘッドの
（図２のＤ−Ｄ線に沿う）断面図である。FIG. 3 is a cross-sectional view (along line DD in FIG. 2) of the cylinder head of the engine according to the embodiment of the present invention;
【図４】本発明実施例のエンジンのシリンダヘッドの
（図２のＥ−Ｅ線に沿う）断面図である。FIG. 4 is a cross-sectional view (along line EE in FIG. 2) of the cylinder head of the engine according to the embodiment of the present invention;
１ シリンダヘッド ２ 上層ウォータジャケット ３ 下層ウォータジャケット ４ 穴部 ４ａ 円柱部 ４ｂ 円柱部外周面 ５ 水穴 ６ 水穴 ７、７ａ 水穴 ８ａ、８ｂ インテークポート ９ａ、９ｂ エキゾーストポート １０、１０´ 水路 １１ 水路 １２ 水路 １３ 水路 １４ ヘッドボルトボス １５ 水路 １７ リブ １８ 水路 DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Upper water jacket 3 Lower water jacket 4 Hole 4a Cylindrical part 4b Cylindrical part outer peripheral surface 5 Water hole 6 Water hole 7, 7a Water hole 8a, 8b Intake port 9a, 9b Exhaust port 10, 10 'Water path 11 Water path 12 waterway 13 waterway 14 head bolt boss 15 waterway 17 rib 18 waterway
Claims (1)
のウォータジャケットの少なくともエキゾーストポート
側半分を上層ウォータジャケットと下層ウォータジャケ
ットとの２層構造とし、前記下層ジャケットの天井をイ
ンジェクタまたは点火栓の取付部を構成する円柱部の外
周上で最も低くなるような円錐面に形成したエンジンの
シリンダヘッド。1. A water jacket of a cylinder head having four valves per cylinder has a two-layer structure of an upper water jacket and a lower water jacket at least on an exhaust port side half, and a ceiling of the lower jacket has an injector or spark plug mounting portion. An engine cylinder head formed in a conical surface that is the lowest on the outer periphery of the cylindrical portion constituting the cylinder head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27146898A JP3596305B2 (en) | 1998-09-25 | 1998-09-25 | Engine cylinder head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27146898A JP3596305B2 (en) | 1998-09-25 | 1998-09-25 | Engine cylinder head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000104624A true JP2000104624A (en) | 2000-04-11 |
| JP3596305B2 JP3596305B2 (en) | 2004-12-02 |
Family
ID=17500466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27146898A Expired - Fee Related JP3596305B2 (en) | 1998-09-25 | 1998-09-25 | Engine cylinder head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3596305B2 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003074349A (en) * | 2001-09-03 | 2003-03-12 | Honda Motor Co Ltd | Water-cooled four cycle engine |
| US6681727B2 (en) | 2001-01-29 | 2004-01-27 | Avl List Gmbh | Cylinder head for a plurality of cylinders |
| JP2005535819A (en) * | 2002-06-21 | 2005-11-24 | エフエーファオ モトレンテクニーク ゲゼルシャフト ミット ベシュレンクテル ハフツング | Cooling cylinder head for piston engine |
| DE102004040227A1 (en) * | 2004-08-18 | 2006-02-23 | Bayerische Motoren Werke Ag | Cylinder head for a water-cooled multi-cylinder internal combustion engine |
| WO2006072333A1 (en) * | 2004-12-24 | 2006-07-13 | Fev Motorentechnik Gmbh | Cylinder head with reinforcement |
| CN103266961A (en) * | 2013-05-27 | 2013-08-28 | 安徽江淮汽车股份有限公司 | Engine cylinder cover |
| CN103291487A (en) * | 2013-05-27 | 2013-09-11 | 安徽江淮汽车股份有限公司 | Cooling water system for cylinder heads of engine |
| JP2014114710A (en) * | 2012-12-07 | 2014-06-26 | Nissan Motor Co Ltd | Cooling structure of cylinder head |
| CN104074621A (en) * | 2014-07-07 | 2014-10-01 | 广西玉柴机器股份有限公司 | Water jacket for cylinder cover |
| CN108999716A (en) * | 2018-08-28 | 2018-12-14 | 中国北方发动机研究所(天津) | A kind of engine cylinder cap casting cooling water jacket structure |
| CN109915275A (en) * | 2019-03-28 | 2019-06-21 | 广西玉柴机器股份有限公司 | A kind of three way type cylinder cap cooling structure of exhaust duct part necking |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6681727B2 (en) | 2001-01-29 | 2004-01-27 | Avl List Gmbh | Cylinder head for a plurality of cylinders |
| JP4494684B2 (en) * | 2001-09-03 | 2010-06-30 | 本田技研工業株式会社 | Water-cooled 4-stroke engine |
| JP2003074349A (en) * | 2001-09-03 | 2003-03-12 | Honda Motor Co Ltd | Water-cooled four cycle engine |
| JP2005535819A (en) * | 2002-06-21 | 2005-11-24 | エフエーファオ モトレンテクニーク ゲゼルシャフト ミット ベシュレンクテル ハフツング | Cooling cylinder head for piston engine |
| DE102004040227A1 (en) * | 2004-08-18 | 2006-02-23 | Bayerische Motoren Werke Ag | Cylinder head for a water-cooled multi-cylinder internal combustion engine |
| US8001935B2 (en) | 2004-12-24 | 2011-08-23 | Fev Motorentechnik Gmbh | Cylinder head with reinforcement |
| WO2006072333A1 (en) * | 2004-12-24 | 2006-07-13 | Fev Motorentechnik Gmbh | Cylinder head with reinforcement |
| JP2014114710A (en) * | 2012-12-07 | 2014-06-26 | Nissan Motor Co Ltd | Cooling structure of cylinder head |
| CN103266961A (en) * | 2013-05-27 | 2013-08-28 | 安徽江淮汽车股份有限公司 | Engine cylinder cover |
| CN103291487A (en) * | 2013-05-27 | 2013-09-11 | 安徽江淮汽车股份有限公司 | Cooling water system for cylinder heads of engine |
| AU2013391199B2 (en) * | 2013-05-27 | 2016-03-17 | Anhui Jianghuai Automobile Group Corp., Ltd. | Water cooling system for a cylinder head of an engine |
| CN104074621A (en) * | 2014-07-07 | 2014-10-01 | 广西玉柴机器股份有限公司 | Water jacket for cylinder cover |
| CN108999716A (en) * | 2018-08-28 | 2018-12-14 | 中国北方发动机研究所(天津) | A kind of engine cylinder cap casting cooling water jacket structure |
| CN109915275A (en) * | 2019-03-28 | 2019-06-21 | 广西玉柴机器股份有限公司 | A kind of three way type cylinder cap cooling structure of exhaust duct part necking |
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