JP3131888B2 - Siamese type cylinder block casting method - Google Patents
Siamese type cylinder block casting methodInfo
- Publication number
- JP3131888B2 JP3131888B2 JP05006872A JP687293A JP3131888B2 JP 3131888 B2 JP3131888 B2 JP 3131888B2 JP 05006872 A JP05006872 A JP 05006872A JP 687293 A JP687293 A JP 687293A JP 3131888 B2 JP3131888 B2 JP 3131888B2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder block
- cylinder
- casting
- curvature
- radius
- 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 - Fee Related
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
- F02F1/02—Cylinders; Cylinder heads having cooling means
- F02F1/10—Cylinders; Cylinder heads having cooling means for liquid cooling
- F02F1/108—Siamese-type cylinders, i.e. cylinders cast together
-
- 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
- F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
- F02B75/18—Multi-cylinder engines
- F02B2075/1804—Number of cylinders
- F02B2075/1816—Number of cylinders four
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
【０００１】[0001]
【産業上の利用分野】本発明はサイアミーズ型シリンダ
ブロックの鋳造方法に関し、特に内部に複数のシリンダ
スリーブを保持した金型にクランクケース側から溶湯を
注入することにより、前記シリンダスリーブの周囲を薄
肉の包被部で鋳包むとともに、この包被部の周囲を囲繞
するウオータジャケットに、隣接する一対のシリンダス
リーブの対向部間に楔状に入り込む谷形領域を形成して
なるサイアミーズ型シリンダブロックの鋳造方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for casting a siamese type cylinder block, and more particularly to a method of casting a molten metal from a crankcase side into a mold holding a plurality of cylinder sleeves therein, thereby thinning the periphery of the cylinder sleeve. Casting of a siamese-type cylinder block in which a water jacket surrounding the periphery of the wrapped portion is formed with a valley-shaped region that enters a wedge shape between opposed portions of a pair of adjacent cylinder sleeves. About the method.
【０００２】[0002]
【従来の技術】かかるサイアミーズ型シリンダブロック
の鋳造は、金型のキャビティ内に突出するボアピンの外
周に予めシリンダスリーブを保持させた状態で、シリン
ダブロックのクランクケース側から溶湯を注入し、前記
シリンダスリーブの周囲を包被部で鋳包むことにより行
われる。2. Description of the Related Art Such a Siamese type cylinder block is cast by injecting molten metal from a crankcase side of a cylinder block in a state where a cylinder sleeve is held in advance on an outer periphery of a bore pin projecting into a cavity of a mold. This is performed by casting around the sleeve with a covering portion.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記従
来の鋳造方法では、鋳造時にクランクケース側に設けた
湯口から注入された溶湯が次第に温度を下げながらデッ
キ面側に流入するため、シリンダスリーブの周囲を鋳包
む包被部の湯回りがデッキ面の近傍において不充分にな
り、その部分に巣孔等の鋳造不良が発生する問題があっ
た。However, in the above-mentioned conventional casting method, the molten metal injected from the gate provided on the crankcase side at the time of casting flows into the deck surface side while gradually lowering the temperature. There is a problem that the run of the molten metal in the wrapping portion for casting is insufficient in the vicinity of the deck surface, and casting defects such as burrows occur in that portion.
【０００４】本発明は前述の事情に鑑みてなされたもの
で、サイアミーズ型シリンダブロックのデッキ面の近傍
の湯回りを良好にして鋳造不良の発生を防止することを
目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to prevent poor casting by improving the run of water near the deck surface of a Siamese type cylinder block.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、内部に複数のシリンダスリーブを保持し
た金型にクランクケース側から溶湯を注入することによ
り、前記シリンダスリーブの周囲を薄肉の包被部で鋳包
むとともに、この包被部の周囲を囲繞するウオータジャ
ケットに、隣接する一対のシリンダスリーブの対向部間
に楔状に入り込む谷形領域を形成してなるサイアミーズ
型シリンダブロックの鋳造方法において、デッキ面に連
なる所定範囲における前記谷形領域先端の曲率半径を、
前記所定範囲よりもクランクケース側の部分における前
記谷形領域先端の曲率半径よりも小さく形成したことを
特徴とする。In order to achieve the above object, the present invention provides a mold having a plurality of cylinder sleeves therein by injecting a molten metal from a crankcase side into a mold. A siamese-type cylinder block in which a water jacket surrounding the periphery of the wrapped portion is formed with a valley-shaped region that enters a wedge shape between opposed portions of a pair of adjacent cylinder sleeves, while being cast-cast with a thin wrapped portion. In the casting method, the radius of curvature of the trough-shaped region tip in a predetermined range connected to the deck surface,
It is characterized in that it is formed to be smaller than the radius of curvature of the tip of the valley-shaped region in a portion closer to the crankcase than the predetermined range.
【０００６】[0006]
【実施例】以下、図面に基づいて本発明の実施例を説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【０００７】図１はサイアミーズ型シリンダブロックＷ
を鋳造するための金型Ｄを示すものである。金型Ｄは固
定型１、可動型２、上型３及び下型４からなり、固定型
１はクランクケースＷ1 の内面を形成するための中子５
を備えるとともに、可動型２はシリンダブロックＷに鋳
包まれるシリンダスリーブＳを保持するボアピン６とウ
オータジャケットＪを形成するための中子７とを備え
る。固定型１にはキャビティに溶湯を注入する湯口（図
示せず）が設けられており、従って湯口から注入された
溶湯は、シリンダブロックＷのクランクケースＷ1 側か
らシリンダヘッドとの接合面であるデッキ面Ｗ2 側に向
けて流入する。FIG. 1 shows a Siamese type cylinder block W.
1 shows a metal mold D for casting a steel sheet. Mold D is fixed mold 1, the movable die 2 consists of an upper mold 3 and a lower mold 4, the fixed mold 1 core for forming the inner surface of the crankcase W 1 5
The movable mold 2 includes a bore pin 6 for holding a cylinder sleeve S cast and encapsulated in a cylinder block W, and a core 7 for forming a water jacket J. The fixed mold 1 and sprue is injected (not shown) is provided a molten metal into the cavity, the molten metal injected from the sprue therefore, is a joint surface between the cylinder head from the crankcase W 1 of the cylinder block W and it flows toward the deck surface W 2 side.
【０００８】図２は前記金型Ｄによって鋳造されたシリ
ンダブロックＷを示すものである。シリンダブロックＷ
のデッキ面Ｗ2 には、直列に配設された４個のシリンダ
スリーブＳ…の上端が露出しており、これらシリンダス
リーブＳ…の周囲が略一定厚さを有する包被部Ｗ3 で覆
われるとともに、この包被部Ｗ3 の周囲に略一定幅のウ
オータジャケットＪが形成される。隣接する一対のシリ
ンダスリーブＳ…間において包被部Ｗ3 に食い込むウオ
ータジャケットＪの谷形領域Ｊ1 は、その先端の曲率半
径がシリンダスリーブＳ…の長手方向に沿って変化す
る。FIG. 2 shows a cylinder block W cast by the mold D. Cylinder block W
On the deck surface W 2 is exposed four cylinder sleeves S ... upper end of which is arranged in series, covering these cylinder sleeves S ... surrounding is in envelope section W 3 having a substantially uniform thickness with cracking, water jacket J of substantially constant width around the envelope part W 3 are formed. Valley shaped region J 1 of the water jacket J biting into the envelope part W 3 in the adjacent pair of cylinder sleeves S ... between the radius of curvature of the tip varies along the longitudinal direction of the cylinder sleeve S ....
【０００９】即ち、図３及び図４から明らかなように、
シリンダブロックＷのデッキ面Ｗ2からの所定範囲Ｌ
（Ｌは１０ｍｍ以下が適切である）における谷形領域Ｊ
1 先端の曲率半径Ｒ1 は、クランクケースＷ1 側の他の
部分における谷形領域Ｊ1 先端の曲率半径Ｒ2 よりも小
さく形成される。従って、デッキ面Ｗ2 の近傍では包被
部Ｗ3 の厚さが局部的に薄くなる。That is, as is apparent from FIGS. 3 and 4,
Predetermined range L from the deck surface W 2 of the cylinder block W
(L is suitably 10 mm or less) in the valley-shaped region J
The radius of curvature R 1 at one end is formed smaller than the radius of curvature R 2 at the end of the valley-shaped region J 1 in the other part of the crankcase W 1 . Therefore, the thickness of the Tsutsumihi portion W 3 is locally thinner in the vicinity of the deck surface W 2.
【００１０】而して、金型Ｄのキャビティに溶湯を注入
してシリンダブロックＷを鋳造する際に、シリンダブロ
ックＷのクランクケースＷ1 側から注入された溶湯はデ
ッキ面Ｗ2 に向けて流れ、その過程でシリンダスリーブ
Ｓ…と中子７との間に流入してシリンダスリーブＳ…を
鋳包む包被部Ｗ3 を形成する。このとき、湯口を有する
クランクケースＷ1 から遠ざかるにつれて、溶湯の温度
が次第に低下するために湯回りが悪くなり、包被部Ｗ3
のデッキ面Ｗ2 近傍に巣孔が発生し易くなる。しかしな
がら、デッキ面Ｗ2 から所定距離Ｌにおけるウオータジ
ャケットＪの谷形領域Ｊ1 先端の曲率半径Ｒ1 を他の部
分の曲率半径Ｒ2 よりも小さく形成したことにより、溶
湯の流路がデッキ面Ｗ2 の近傍で急激に狭まるため、溶
湯がデッキ面Ｗ2 に隣接する包被部Ｗ3 に加速度的に流
入し、その部分に巣孔が発生する不具合が解消される。[0010] In Thus, when casting the cylinder block W by injecting molten metal into the cavity of the mold D, the molten metal injected from the crankcase W 1 of the cylinder block W toward the deck surface W 2 stream , to form the envelope section W 3 to wrap casting a cylinder sleeve S ... and flows between the cylinder sleeve S ... and the core 7 in the process. In this case, as the distance from the crankcase W 1 having a sprue, molten metal is poor because the temperature of the melt is lowered gradually, the envelope section W 3
Deck surface W 2 Suana near tends to occur in. However, by having the radius of curvature R 1 of the valley-type region J 1 tip of the water jacket J is smaller than the radius of curvature R 2 of the other portion from the deck surface W 2 at a predetermined distance L, the flow path deck surface of the molten metal because narrowed sharply in the vicinity of the W 2, melt acceleration to flow into the envelope section W 3 adjacent to the deck surface W 2, Suana a defect which occurs is eliminated in that portion.
【００１１】以上、本発明の実施例を詳述したが、本発
明は前記実施例に限定されるものでなく、種々の設計変
更を行うことが可能である。Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made.
【００１２】例えば、実施例のシリンダブロックＷは複
数の独立したシリンダスリーブＳ…を有するが、本発明
は複数のシリンダスリーブＳ…を相互に連結したシリン
ダスリーブ集合体を有するシリンダブロックＷに対して
も適用可能である。For example, the cylinder block W of the embodiment has a plurality of independent cylinder sleeves S. However, the present invention relates to a cylinder block W having a cylinder sleeve assembly in which a plurality of cylinder sleeves S are interconnected. Is also applicable.
【００１３】[0013]
【発明の効果】以上のように本発明によれば、隣接する
一対のシリンダスリーブの対向部間に楔状に入り込むウ
オータジャケットの谷形領域先端の曲率半径を、デッキ
面に連なる所定範囲でクランクケース側における前記谷
形領域先端の曲率半径よりも小さく形成したことによ
り、クランクケース側から流入する溶湯をデッキ面に隣
接する包被部に加速度的に充填することができる。これ
により、溶湯の温度低下にも関わらずデッキ部近傍の包
被部の湯回りを向上させ、この部分に巣孔が発生するの
を防止することができる。As described above, according to the present invention, the radius of curvature of the tip of the valley-shaped region of the water jacket that enters the wedge between the opposing portions of the pair of adjacent cylinder sleeves is set within a predetermined range continuous with the deck surface. By making the radius of curvature smaller than the radius of curvature of the tip of the valley region on the side, the molten metal flowing in from the crankcase side can be filled into the wrapping portion adjacent to the deck surface at an accelerated rate. This makes it possible to improve the flow of molten metal around the deck in the vicinity of the deck despite the decrease in the temperature of the molten metal, and to prevent burrows from being generated in this part.
【図１】シリンダブロックを鋳造する金型の断面図FIG. 1 is a sectional view of a mold for casting a cylinder block.
【図２】図１の２−２線断面図FIG. 2 is a sectional view taken along line 2-2 of FIG.
【図３】図２の３部拡大図FIG. 3 is an enlarged view of a part of FIG. 2;
【図４】図３の４−４線断面図FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;
Ｄ 金型 Ｊ ウオータジャケット Ｊ1 谷形領域 Ｌ 所定範囲 Ｒ1 曲率半径 Ｒ2 曲率半径 Ｓ シリンダスリーブ Ｗ1 クランクケース Ｗ2 デッキ面 Ｗ3 包被部D Mold J Water jacket J 1 Valley area L Predetermined range R 1 Radius of curvature R 2 Radius of curvature S Cylinder sleeve W 1 Crankcase W 2 Deck surface W 3 Envelope
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B22D 19/08 F02F 1/00 F02F 1/16 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) B22D 19/08 F02F 1/00 F02F 1/16
Claims (1)
保持した金型（Ｄ）にクランクケース（Ｗ1 ）側から溶
湯を注入することにより、前記シリンダスリーブ（Ｓ）
の周囲を薄肉の包被部（Ｗ3 ）で鋳包むとともに、この
包被部（Ｗ3）の周囲を囲繞するウオータジャケット
（Ｊ）に、隣接する一対のシリンダスリーブ（Ｓ）の対
向部間に楔状に入り込む谷形領域（Ｊ1 ）を形成してな
るサイアミーズ型シリンダブロックの鋳造方法におい
て、 デッキ面（Ｗ2 ）に連なる所定範囲（Ｌ）における前記
谷形領域（Ｊ1 ）先端の曲率半径（Ｒ1 ）を、前記所定
範囲（Ｌ）よりもクランクケース側（Ｗ1 ）の部分にお
ける前記谷形領域（Ｊ1 ）先端の曲率半径（Ｒ2 ）より
も小さく形成したことを特徴とする、サイアミーズ型シ
リンダブロックの鋳造方法。1. A cylinder (S) having a plurality of cylinder sleeves (S) held therein by injecting molten metal from a crankcase (W 1 ) side into a mold (D).
Around with wrap cast in a thin envelope section (W 3) of the water jacket (J) surrounding the periphery of the envelope part (W 3), between the opposed portions of a pair of adjacent cylinder sleeves (S) In a method for casting a siamese cylinder block in which a valley region (J 1 ) is formed into a wedge shape, a curvature of a tip of the valley region (J 1 ) in a predetermined range (L) connected to a deck surface (W 2 ) A radius (R 1 ) is formed to be smaller than a radius of curvature (R 2 ) at the tip of the valley-shaped region (J 1 ) in a portion on the crankcase side (W 1 ) from the predetermined range (L). A method of casting a Siamese type cylinder block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05006872A JP3131888B2 (en) | 1993-01-19 | 1993-01-19 | Siamese type cylinder block casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05006872A JP3131888B2 (en) | 1993-01-19 | 1993-01-19 | Siamese type cylinder block casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06210432A JPH06210432A (en) | 1994-08-02 |
| JP3131888B2 true JP3131888B2 (en) | 2001-02-05 |
Family
ID=11650327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05006872A Expired - Fee Related JP3131888B2 (en) | 1993-01-19 | 1993-01-19 | Siamese type cylinder block casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3131888B2 (en) |
-
1993
- 1993-01-19 JP JP05006872A patent/JP3131888B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06210432A (en) | 1994-08-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5188071A (en) | Cylinder block structure | |
| JPH0929416A (en) | Method of cooling molten metal for die and device therefor and molten metal cooling pin for die | |
| JP3131888B2 (en) | Siamese type cylinder block casting method | |
| US4831712A (en) | Method for manufacturing siamese-type cylinder block and apparatus for casting blank for such cylinder block | |
| JPH02192870A (en) | Method and apparatus for manufacturing cylinder block | |
| JP2798604B2 (en) | Casting method and casting apparatus | |
| JP2813947B2 (en) | Siamese type cylinder block and casting method therefor | |
| JPS5894622A (en) | Manufacture of connecting rod for use in internal combustion engine | |
| EP0869270A2 (en) | Cylinder block with welded bridge-elements | |
| JP2789150B2 (en) | Semi-finished cylinder block, method of manufacturing cylinder block, and mold for semi-finished cylinder block | |
| JP2653841B2 (en) | Casting manufacturing method | |
| JP2599668B2 (en) | Semi-finished cylinder block, method of manufacturing cylinder block, and mold for semi-finished cylinder block | |
| US5474119A (en) | Method of and mold for casting a combined engine block and cylinder head for a twin piston engine | |
| JPS5924848Y2 (en) | Cylinder block cooling system | |
| JPH05321751A (en) | Cylinder sleeve aggregate for multi-cylinder internal combustion engine | |
| JP3535384B2 (en) | Casting mold | |
| JPH08206814A (en) | Metallic mold casting method | |
| JPH02307658A (en) | Manufacture of cylinder block | |
| JPH0417942A (en) | Metallic mold for casting | |
| JPH0724550A (en) | Pin for hole as cast for casting | |
| JP3052723B2 (en) | Method for manufacturing cooling passage of cylinder block in internal combustion engine | |
| JPS61229441A (en) | Continuous casting method for preventing cavity in central part | |
| JP2003230943A (en) | Mold structure | |
| JP3215520B2 (en) | Casting method of cylinder block | |
| US3238578A (en) | Chill mold casting method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20071124 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081124 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081124 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091124 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091124 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101124 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101124 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20111124 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20111124 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20121124 Year of fee payment: 12 |
|
| LAPS | Cancellation because of no payment of annual fees |