JPH0146703B2 - - Google Patents
Info
- Publication number
- JPH0146703B2 JPH0146703B2 JP26255884A JP26255884A JPH0146703B2 JP H0146703 B2 JPH0146703 B2 JP H0146703B2 JP 26255884 A JP26255884 A JP 26255884A JP 26255884 A JP26255884 A JP 26255884A JP H0146703 B2 JPH0146703 B2 JP H0146703B2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- water jacket
- cylinder block
- water
- closed
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 46
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 8
- 229910001234 light alloy Inorganic materials 0.000 claims description 7
- 238000005266 casting Methods 0.000 description 12
- 239000000498 cooling water Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000004512 die casting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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
- F02F1/02—Cylinders; Cylinder heads having cooling means
- F02F1/10—Cylinders; Cylinder heads having cooling means for liquid cooling
-
- 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
- F02F1/02—Cylinders; Cylinder heads having cooling means
- F02F1/10—Cylinders; Cylinder heads having cooling means for liquid cooling
- F02F2001/106—Cylinders; Cylinder heads having cooling means for liquid cooling using a closed deck, i.e. the water jacket is not open at the block top face
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】
Ａ 発明の目的
(1) 産業上の利用分野
本発明は車両用として好適な水冷式内燃機関の
クローズドデツキ型シリンダブロツクに関するも
のである。DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Industrial Application Field The present invention relates to a closed deck type cylinder block for a water-cooled internal combustion engine suitable for use in a vehicle.
(2) 従来の技術
従来、水冷式内燃機関のクローズドデツキ型シ
リンダブロツクは公知であり、また前記シリンダ
ブロツクを軽合金により形成することも公知であ
る（実公昭59−13319号公報、特開昭58−74851号
公報参照）。(2) Prior Art A closed deck cylinder block for a water-cooled internal combustion engine has been known, and it is also known that the cylinder block is made of a light alloy (see Japanese Utility Model Publication No. 13319/1983, Japanese Patent Laid-Open Publication No. 1983-13319, (See Publication No. 58-74851).
(3) 発明が解決しようとする問題点
一般に水冷式内燃機関のシリンダブロツクにお
いて、該ブロツクの主としてシリンダ部周囲を冷
却するためのウオータジヤケツトは、その上端が
シリンダブロツクの上面、すなわちデツキ面に略
全面に亘つて開放されるオープンデツキ型と、そ
のデツキ面にはシリンダヘツドへの流水路が開口
されて他は閉成されるクローズドデツキ型とが知
られている。(3) Problems to be Solved by the Invention In general, in the cylinder block of a water-cooled internal combustion engine, the water jacket, which mainly cools the surrounding area of the cylinder, has its upper end on the upper surface of the cylinder block, that is, on the deck surface. Two types are known: an open deck type in which almost the entire surface is open, and a closed deck type in which a flow channel to the cylinder head is opened on the deck surface and the rest is closed.
ところでクローズドデツキ型シリンダブロツク
は、その剛性、特にシリンダヘツドへの取付面、
すなわちデツキ面の剛性が大きく、またシリンダ
ブロツクとシリンダヘツド間のガスケツトの耐久
性を高めることができ、車両用高出力多気筒機関
用として好適であるが、これを鋳造する際の技術
的課題が多く、特に車両用多気筒内燃機関のクロ
ーズド型シリンダブロツクがアルミ合金等の軽合
金製の場合には、その鋳造が難しく、またそれが
可能であつてもきわめてコスト高となるという不
都合があり、従来では軽合金製多気筒機関のシリ
ンダブロツクの大多数は、鋳造の比較的容易な前
記オープンデツキ型のものが採用されている。こ
の場合シリンダブロツクは在来のダイキヤスト鋳
造法による鋳造が可能であるので、量産が可能で
あり、コストも嵩まないという利点があるが、こ
のダイキヤスト鋳造法ではウオータジヤケツトが
金型で形成されるため、該ジヤケツトの形状、深
さ等に自から限界があつて所望のウオータジヤケ
ツトが得られず、これがシリンダブロツクの冷却
性に影響を及ぼし出力向上のマイナス要因になる
という問題がある。 By the way, the closed deck type cylinder block has its rigidity, especially the mounting surface to the cylinder head,
In other words, the deck surface is highly rigid, and the gasket between the cylinder block and cylinder head can be made durable, making it suitable for use in high-output multi-cylinder engines for vehicles, but there are technical issues when casting it. In many cases, especially when the closed cylinder block of a multi-cylinder internal combustion engine for a vehicle is made of light alloy such as aluminum alloy, it is difficult to cast it, and even if it is possible, it is extremely costly. Conventionally, the majority of cylinder blocks for multi-cylinder engines made of light alloy have been of the open deck type, which is relatively easy to cast. In this case, the cylinder block can be cast using the conventional die-casting method, which has the advantage of being mass-produced and does not increase costs. Therefore, there are limits to the shape, depth, etc. of the jacket, making it impossible to obtain a desired water jacket, which affects the cooling performance of the cylinder block and becomes a negative factor in improving output.
そこで本出願人は在来のダイキヤスト鋳造法と
は異なる、中子を用いた新規な加圧鋳造法を開発
し、該鋳造法に基づく軽合金製クローズドデツキ
型シリンダブロツクの加圧鋳造方法を既に出願し
ている。 Therefore, the present applicant has developed a new pressure casting method using a core, which is different from the conventional die casting method, and has already developed a pressure casting method for a light alloy closed deck type cylinder block based on this casting method. I have applied.
本発明はかかる新規な加圧鋳造法によつて鋳造
が可能となつたクローズドデツキ型シリンダブロ
ツクに係るもので、そこに形成されるウオータジ
ヤケツトを所望の形状に形成して該ウオータジヤ
ケツトを流れる冷却水はシリンダブロツクを有効
に冷却するとともにシリンダヘツドへも抵抗少な
く円滑に流れるようにして、さらにウオータジヤ
ケツトを成形した後の砂中子の取出しも容易にし
て鋳造性にも優れたシリンダブロツクを提供する
ことを目的とするものである。 The present invention relates to a closed deck type cylinder block that can be cast by such a new pressure casting method, and the water jacket formed therein can be formed into a desired shape to form the water jacket. The flowing cooling water effectively cools the cylinder block and flows smoothly to the cylinder head with little resistance, making it easy to remove the sand core after the water jacket has been molded, resulting in a cylinder with excellent castability. The purpose is to provide blocks.
Ｂ 発明の構成
(1) 問題点を解決するための手段
本発明によれば、前記目的達成のためクローズ
ドデツキ型軽合金製シリンダブロツクにおいて、
そのシリンダ部に形成されるシリンダボアの外周
を囲繞するウオータジヤケツトを、該シリンダボ
アの略全長に亘つて形成し、前記ウオータジヤケ
ツトのシリンダボアの軸方向に沿う上、下両端部
を、その中間部よりも膨大に形成し、さらにウオ
ータジヤケツトの下端部に盲栓で閉じられる砂抜
き孔を開口する。B. Structure of the Invention (1) Means for Solving the Problems According to the present invention, in order to achieve the above object, in a closed deck type light alloy cylinder block,
A water jacket that surrounds the outer periphery of a cylinder bore formed in the cylinder portion is formed over approximately the entire length of the cylinder bore, and both upper and lower ends of the water jacket along the axial direction of the cylinder bore are connected to an intermediate portion thereof. A sand removal hole is formed at the lower end of the water jacket and is closed with a blind plug.
(2) 作用
前記構成によれば、シリンダブロツクのウオー
タジヤケツト内を流れる冷却水は、シリンダブロ
ツクをよく冷却するとともにシリンダヘツド側の
ウオータジヤケツトへも抵抗少なく円滑に流れ、
またウオータジヤケツトの鋳造に際して、これを
成形する砂中子の取出しが容易である。(2) Effects According to the above configuration, the cooling water flowing inside the water jacket of the cylinder block cools the cylinder block well, and also flows smoothly to the water jacket on the cylinder head side with little resistance.
Furthermore, when casting a water jacket, the sand core used to form the water jacket can be easily removed.
(3) 実施例
以下、図面により本発明を直列四気筒内燃機関
のシリンダブロツクに実施した場合の実施例につ
いて説明する。(3) Embodiments Hereinafter, embodiments in which the present invention is applied to a cylinder block of an in-line four-cylinder internal combustion engine will be described with reference to the drawings.
アルミ合金製直列四気筒シリンダブロツクＢ
は、本出願人の開発した加圧鋳造法により一体に
鋳造され、上半のシリンダ部１と下半のクランク
ケース部２とよりなる。シリンダ部１には四つの
シリンダボア３…が直列され、それらのシリンダ
ボア３…は、それらの隣接境界壁５にウオータジ
ヤケツトのない、所謂サイアミーズ型に形成され
る。 Aluminum alloy in-line four-cylinder cylinder block B
is integrally cast by a pressure casting method developed by the applicant, and consists of an upper cylinder portion 1 and a lower crankcase portion 2. Four cylinder bores 3 are arranged in series in the cylinder portion 1, and these cylinder bores 3 are formed in a so-called Siamese type without a water jacket on their adjacent boundary walls 5.
各シリンダボア３には、それぞれシリンダライ
ナ４が嵌挿支持される。 A cylinder liner 4 is fitted and supported in each cylinder bore 3, respectively.
またシリンダ部１には、相隣れるシリンダボア
３間の隣接境界壁５を除いて、各シリンダボア３
を囲繞するようにウオータジヤケツト６が形成さ
れる。このウオータジヤケツト６はシリンダボア
の略全長に亘つて長く形成され、その上、下両端
部６ｕ、６ｄは、その中間部６ｍよりも膨大に形
成される。そしてその下端部６ｄは、その上端部
６ｕよりも、より大きな膨大部となつている。し
たがつてウオータジヤケツト６の上端部６ｕ、中
間部６ｍおよび下端部６ｄの横断面積A1、A2お
よびA3の大きさはA2＜A1＜A3となる。シリンダ
ブロツクＢをクローズドデツキ型とすべく、該シ
リンダブロツクＢのウオータジヤケツト６上には
所定の壁厚の上壁７が形成され、この上壁７の上
面は、シリンダヘツドＨを接合すべきデツキ面８
に形成される。前記上壁７には、多数の流水路９
が穿設され、この流水路９を通してウオータジヤ
ケツト６はデツキ面８に開口され、ガスケツトＧ
を介してシリンダヘツドＨが接合されるとき、前
記ウオータジヤケツト６は前記流水路９を通して
シリンダヘツドＨ側のウオータジヤケツトと連通
される。而してウオータジヤケツト６の上端部６
ｕを膨大に形成することによりそこに貯留される
冷却水容量が多くなるとともに前記流水路９の開
口面積を大きくすることができ、シリンダブロツ
クＢ側のウオータジヤケツト６からシリンダヘツ
ドＨ側の水ジヤケツト（図示せず）への流通冷却
水量を多くすることができ、かつそこを流れる冷
却水の流動抵抗を低減することができる。 In addition, each cylinder bore 3 is provided in the cylinder portion 1, except for the adjacent boundary wall 5 between adjacent cylinder bores 3.
A water jacket 6 is formed to surround the. This water jacket 6 is formed long over substantially the entire length of the cylinder bore, and furthermore, both lower end portions 6u and 6d are formed to be larger than the middle portion 6m. The lower end portion 6d is a larger enlarged portion than the upper end portion 6u. Therefore, the sizes of the cross-sectional areas A 1 , A 2 and A 3 of the upper end 6u, middle portion 6m and lower end 6d of the water jacket 6 are A 2 <A 1 <A 3 . In order to make the cylinder block B a closed deck type, an upper wall 7 of a predetermined wall thickness is formed on the water jacket 6 of the cylinder block B, and the upper surface of this upper wall 7 is to be connected to the cylinder head H. Deck surface 8
is formed. The upper wall 7 has a large number of flow channels 9.
The water jacket 6 is opened to the deck surface 8 through this flow channel 9, and the gasket G is opened to the deck surface 8.
When the cylinder head H is joined via the water jacket 6, the water jacket 6 is communicated with the water jacket on the cylinder head H side through the flow channel 9. Therefore, the upper end 6 of the water jacket 6
By forming u to be enormous, the capacity of the cooling water stored there increases and the opening area of the flow channel 9 can be increased, allowing water to flow from the water jacket 6 on the cylinder block B side to the cylinder head H side. The amount of cooling water flowing through the jacket (not shown) can be increased, and the flow resistance of the cooling water flowing therethrough can be reduced.
前記ウオータジヤケツト６の底壁１０は、その
壁厚dbが薄く形成され、これがウオータジヤケ
ツト６の内側壁１１の壁厚diおよびその外側壁１
２の壁厚doと略等しい。 The bottom wall 10 of the water jacket 6 is formed to have a thin wall thickness db, which increases the wall thickness di of the inner wall 11 of the water jacket 6 and the outer wall 1 thereof.
It is approximately equal to the wall thickness do of 2.
そしてその許容される寸法差の範囲は10％以内
である。 The allowable dimensional difference is within 10%.
シリンダブロツクＢのクランクケース部２に
は、シリンダボア３の配列方向に沿つて複数のジ
ヤーナル壁１３が一体に形成され、それらのジヤ
ーナル壁１３の下面中央部にクランク軸Ｓを支承
するための軸受半部１４が形成される。 A plurality of journal walls 13 are integrally formed in the crankcase portion 2 of the cylinder block B along the arrangement direction of the cylinder bores 3, and a bearing half for supporting the crankshaft S is provided at the center of the lower surface of the journal walls 13. A section 14 is formed.
而して前記ウオータジヤケツト６は、シリンダ
ブロツクＢの鋳造時に、中子によつて形成される
もので、ウオータジヤケツト６の下端部６ｄには
シリンダブロツクＢの外側壁１２に開口する砂抜
き孔１５が開口され、鋳造後の砂中子は、この砂
抜き孔１５を通して外部に取出される。この場合
ウオータジヤケツト６の下端部６ｄは膨大に形成
されることにより砂抜き部の容量を大きくするこ
とができる。そして鋳造後の前記砂抜き孔１５は
盲栓１６によつて閉じられる。 The water jacket 6 is formed by a core during casting of the cylinder block B, and the lower end 6d of the water jacket 6 has a sand drain hole opened in the outer wall 12 of the cylinder block B. The hole 15 is opened, and the sand core after casting is taken out to the outside through the sand removal hole 15. In this case, the lower end 6d of the water jacket 6 is formed to have a large size, thereby increasing the capacity of the sand removal section. After casting, the sand removal hole 15 is closed with a blind plug 16.
なお、図中１７は、シリンダブロツクＢ上にシ
リンダヘツドＨを固着するためのボルト孔であ
る。 Note that 17 in the figure is a bolt hole for fixing the cylinder head H onto the cylinder block B.
前述のように構成されるクローズドデツキ型シ
リンダブロツクＢを用いた内燃機関が運転されれ
ば、図示しないラジエタからの冷却水はウオータ
ジヤケツト６内に流入し、該シリンダブロツクＢ
の主としてシリンダ部１を冷却する。この場合ウ
オータジヤケツト６の上端部６ｕは膨大に形成さ
れ、その容量が大きくなつているので、前記流水
路９の開口面積を大きくすることができシリンダ
ブロツクＢ側のウオータジヤケツト６と、シリン
ダヘツドＨ側ウオータジヤケツト間を流通する単
位時間当りの冷却水量を多くすることができ、か
つその流動抵抗が低減される。 When an internal combustion engine using the closed deck type cylinder block B configured as described above is operated, cooling water from a radiator (not shown) flows into the water jacket 6 and the cylinder block B
The cylinder portion 1 is mainly cooled. In this case, the upper end 6u of the water jacket 6 is formed to be enormous and has a large capacity, so that the opening area of the flow channel 9 can be increased, and the water jacket 6 on the cylinder block B side and the cylinder The amount of cooling water flowing between the head H side water jackets per unit time can be increased, and the flow resistance thereof can be reduced.
Ｃ 発明の効果
以上の実施例により明らかなように本発明によ
れば、クローズドデツキ型軽合金製シリンダブロ
ツクにおいて、そのシリンダ部に形成されるシリ
ンダボアの外周を囲繞するウオータジヤケツト
を、該シリンダボアの略全長に亘つて形成し、前
記ウオータジヤケツトのシリンダボアの軸方向に
沿う上、下両端部を、その中間部よりも膨大に形
成し、さらにウオータジヤケツトの下端部に盲栓
で閉じられる砂抜き孔を開口したので、シリンダ
ブロツク自体の水冷却性がよい上に、シリンダブ
ロツク側ウオータジヤケツトとシリンダヘツド側
ウオータジヤケツト間を流れる冷却水の単位時間
当りの流量を多くするとともにそれら間の流動抵
抗を低減させることができ、全体として機関全体
の水冷却性能を大幅に向上させることができる。
またシリンダブロツクの鋳造に際して、シリンダ
ブロツク側ウオータジヤケツトの成形する砂中子
の取出作業性を高め、シリンダブロツクの鋳造能
率の向上を図ることができる。C. Effects of the Invention As is clear from the above embodiments, according to the present invention, in a closed deck type light alloy cylinder block, a water jacket surrounding the outer periphery of a cylinder bore formed in the cylinder portion is attached to the cylinder bore. Sand is formed over almost the entire length of the water jacket, has both upper and lower ends along the axial direction of the cylinder bore of the water jacket larger than the middle part, and is further closed with a blind plug at the lower end of the water jacket. Since the vent hole is opened, the water cooling performance of the cylinder block itself is good, and the flow rate of cooling water per unit time between the water jacket on the cylinder block side and the water jacket on the cylinder head side is increased, and the flow rate between them is increased. Flow resistance can be reduced, and the water cooling performance of the entire engine can be significantly improved as a whole.
Further, when casting the cylinder block, it is possible to improve the workability of removing the sand core formed by the water jacket on the cylinder block side, thereby improving the efficiency of casting the cylinder block.
図面は本発明水冷式内燃機関のシリンダブロツ
クの一実施例を示すもので、第１図はその平面
図、第２図はその−線断面図である。
Ｂ……シリンダブロツク、１……シリンダ部、
３……シリンダボア、６……ウオータジヤケツ
ト、１５……砂抜き孔、１６……盲栓。
The drawings show an embodiment of a cylinder block for a water-cooled internal combustion engine according to the present invention, and FIG. 1 is a plan view thereof, and FIG. 2 is a sectional view thereof taken along the line -2. B...Cylinder block, 1...Cylinder part,
3...Cylinder bore, 6...Water jacket, 15...Sand removal hole, 16...Blind plug.
Claims (1)
クにおいて、そのシリンダ部に形成されるシリン
ダボアの外周を囲繞するウオータジヤケツトを、
該シリンダボアの略全長に亘つて形成し、前記ウ
オータジヤケツトのシリンダボアの軸方向に沿う
上、下両端部を、その中間部よりも膨大に形成
し、さらにウオータジヤケツトの下端部に盲栓で
閉じられる砂抜き孔を開口してなることを特徴と
する水冷式内燃機関のシリンダブロツク。1. In a closed deck type light alloy cylinder block, the water jacket surrounding the outer periphery of the cylinder bore formed in the cylinder part is
The water jacket is formed over approximately the entire length of the cylinder bore, and both upper and lower ends of the water jacket along the axial direction of the cylinder bore are formed to be larger than the middle part thereof, and a blind plug is provided at the lower end of the water jacket. A cylinder block for a water-cooled internal combustion engine characterized by having an open sand removal hole that can be closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26255884A JPS61138861A (en) | 1984-12-12 | 1984-12-12 | Cylinder block of water-cooled internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26255884A JPS61138861A (en) | 1984-12-12 | 1984-12-12 | Cylinder block of water-cooled internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61138861A JPS61138861A (en) | 1986-06-26 |
| JPH0146703B2 true JPH0146703B2 (en) | 1989-10-11 |
Family
ID=17377474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26255884A Granted JPS61138861A (en) | 1984-12-12 | 1984-12-12 | Cylinder block of water-cooled internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61138861A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6379452U (en) * | 1986-11-13 | 1988-05-25 | ||
| EP1361355B1 (en) * | 2001-02-15 | 2013-11-06 | Yanmar Co., Ltd. | Cylinder block of engine |
| DE102017216694B4 (en) * | 2017-09-20 | 2022-02-03 | Bayerische Motoren Werke Aktiengesellschaft | Internal combustion engine housing with cylinder cooling |
-
1984
- 1984-12-12 JP JP26255884A patent/JPS61138861A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61138861A (en) | 1986-06-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |