JPH0792019B2 - Cylinder block for outboard motor - Google Patents
Cylinder block for outboard motorInfo
- Publication number
- JPH0792019B2 JPH0792019B2 JP12802186A JP12802186A JPH0792019B2 JP H0792019 B2 JPH0792019 B2 JP H0792019B2 JP 12802186 A JP12802186 A JP 12802186A JP 12802186 A JP12802186 A JP 12802186A JP H0792019 B2 JPH0792019 B2 JP H0792019B2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder block
- hole
- outboard motor
- casting hole
- casting
- 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 - Lifetime
Links
- 238000005266 casting Methods 0.000 claims description 29
- 239000013585 weight reducing agent Substances 0.000 claims description 3
- 238000005304 joining Methods 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 238000010422 painting Methods 0.000 description 6
- 238000000576 coating method Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 3
- 230000002000 scavenging effect Effects 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 230000000740 bleeding effect Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007591 painting process Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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
- F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
- F02B61/04—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
- F02B61/045—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for marine engines
Landscapes
- Engineering & Computer Science (AREA)
- Ocean & Marine Engineering (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】 〔発明の目的〕 （産業上の利用分野） この発明は、アッセンブリ後に脱脂、脱酸、塗装などに
よって表面を処理するようにした船外機のシリンダブロ
ックに関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a cylinder block for an outboard motor, the surface of which is treated by degreasing, deoxidizing, painting after assembly.
（従来の技術） 船外機に組込まれているエンジン部分のアルミダイキャ
スト製シリンダブロックには、駄肉を減らすためにいく
つかの鋳抜き穴が配置されている。この鋳抜き穴は、ク
ランクケースとの合せ面に開口し、組付後は密閉室にな
るように設定される。その理由は、この種のアルミ製品
が海水に侵されやすいので、マリン処理あるいは塗装を
するのが普通であるが、鋳抜き穴に上記処理剤や塗料あ
るいは前処理用の脱脂、脱酸液が侵入して残溜すると却
って腐食が促進されるのでこれを防ぐためで、上記表面
処理は、アッセンブリ後に行なうのが前提である。(Prior Art) Several die-cast holes are arranged in an aluminum die-cast cylinder block of an engine portion which is incorporated in an outboard motor in order to reduce the useless meat. The casting hole is opened on the mating surface with the crankcase, and is set so as to be a closed chamber after assembly. The reason for this is that this type of aluminum product is easily corroded by seawater, so it is common to perform marine treatment or painting. If it invades and remains, it rather promotes corrosion, which is to prevent it. Therefore, it is premised that the above surface treatment is performed after assembly.
ところが、シリンダブロックは製品後高温になるため密
閉室内圧が上昇し、接触しているガスケットを破損させ
る心配がある。一般的にはこの種の空腔にエア抜き孔を
設けておくことで解決するが、上記のように、アッセン
ブリ後に塗装されるものでは、処理剤残留を防ぐために
この解決策は採用できない。このため、この種の船外機
のシリンダブロックのように温度変化の激しい部品には
密閉した室を設けないように設計され、したがって軽量
化のための減肉が制限されるという問題があった。However, since the temperature of the cylinder block becomes high after the product is manufactured, the pressure in the closed chamber rises, which may damage the gasket in contact. In general, this problem is solved by providing an air vent hole in this type of cavity, but as described above, this solution cannot be adopted in the case of coating after assembly to prevent the treatment agent from remaining. For this reason, there is a problem in that it is designed so that a closed chamber is not provided in a part that has a large temperature change, such as a cylinder block of an outboard motor of this type, and therefore the thickness reduction for weight reduction is limited. .
一方、上記エア抜き孔をアッセンブリ塗装後に穿孔加工
することが考えられるが、大きな部品に対して小さな孔
を複数個加工するのは作業性がよくないと同時に、Ｖ型
多気筒エンジンシリンダブロックの相対面に穿孔するの
は極めて困難であるという問題があって、量産品には解
決策になり得ないものであった。On the other hand, it is conceivable to form the air vent holes after assembly coating, but it is not workable to form a plurality of small holes for large parts, and at the same time, the relative size of the V-type multi-cylinder engine cylinder block is reduced. There was a problem that it was extremely difficult to perforate the surface, and it could not be a solution for mass-produced products.
（発明が解決しようとする問題点） 以上のように、アルミダイキャスト製の船外機のシリン
ダブロックでは、減肉用の鋳抜き穴が、塗装工程では密
閉され、製品化された後はエア抜き孔を必要とする問題
点と、塗装後の穴あけ作業が困難であるという問題点が
ある。この発明は、この問題点を解決するもので、密閉
状態に形成した鋳抜き穴に塗装後極めて簡単にエア抜き
孔を付加できるようにした船外機のシリンダブロックを
提供することを目的とする。(Problems to be Solved by the Invention) As described above, in the cylinder block of the aluminum die-cast outboard motor, the casting hole for reducing the wall thickness is sealed in the coating process, and after being commercialized, the air is removed. There are problems that a hole is required and that it is difficult to make a hole after painting. The present invention solves this problem, and an object of the present invention is to provide an outboard motor cylinder block in which an air vent hole can be very easily added to a cast hole formed in a sealed state after painting. .
（問題点を解決するための手段） 上記の目的を達成するため、この発明の船外機のシリン
ダブロックでは、クランクケースなどとの接合によって
密閉される重量軽減用の鋳抜き穴を持つ船外機のシリン
ダブロックにおいて、その鋳抜き穴と外表との間のシリ
ンダブロック壁の外表面に、奥底面に薄肉を残した小径
の鋳抜き穴を形成した構成をとる。(Means for Solving the Problems) In order to achieve the above object, in the cylinder block of the outboard motor of the present invention, an outboard outboard having a casting hole for weight reduction which is sealed by joining with a crankcase or the like. In a cylinder block of a machine, a small diameter casting hole having a thin wall is formed on the inner bottom surface on the outer surface of the cylinder block wall between the casting hole and the outer surface.
（作用） 上記のように構成したので、このシリンダブロックに設
けた鋳抜き穴は、アッセンブリ当初には密閉室となって
障害を残すことなく塗装工程を終えることができ、塗装
後に外表に付加した鋳抜き穴にポンチなどを挿入して奥
底部の薄肉を破ることによってエア抜き孔が容易に形成
される。(Operation) With the above-mentioned configuration, the casting hole provided in this cylinder block becomes a closed chamber at the beginning of the assembly so that the coating process can be completed without leaving any obstacles. The air vent hole is easily formed by inserting a punch or the like into the casting hole and breaking the thin wall at the bottom.
（実施例） 以下この発明の実施例を示す図に就いて詳しく説明す
る。(Embodiment) A detailed description will be given below of a drawing showing an embodiment of the present invention.
第１図は原理的に示したもので、アルミダイキャスト製
シリンダブロック１は同じくアルミダイキャスト製のク
ランクケース２にガスケット３を挟んでボルト４により
接合される。シリンダブロック１には接合面に開口する
減肉による重量軽減のための鋳抜き穴5aが形成され、同
様にクランクケース２にも接合面に開口する鋳抜き穴5b
が形成されている。シリンダブロック１とクランクケー
ス２を上記のように接合したときは、両鋳抜き穴5a,5b
は合体して密閉した空腔として形成される。FIG. 1 shows the principle, and an aluminum die-cast cylinder block 1 is joined to a crankcase 2 also made of aluminum die-cast by a bolt 4 with a gasket 3 interposed therebetween. The cylinder block 1 is formed with a casting hole 5a opened on the joint surface for reducing the weight by reducing the thickness, and similarly, the crankcase 2 is also formed with a casting hole 5b which is opened on the joint surface.
Are formed. When the cylinder block 1 and the crankcase 2 are joined as described above, both casting holes 5a, 5b
Are united to form a closed cavity.
鋳抜き穴5aとシリンダブロック外表面６とを隔てるシリ
ンダブロック壁７の外表面には、内部へ凹陥し、奥底面
に薄肉８を残した小径の鋳抜き穴９が形成されている。
この鋳抜き穴９の存在によっても、シリンダブロック１
とクランクケース２を接合したときの鋳抜き穴5a,5bの
密閉は崩れない。こうしてアッセンブリした形で塗装工
程やマリン処理工程に送られるが、鋳抜き穴5a,5b内に
は前処理のため脱脂液、脱酸液あるいは表面処理液が侵
入しない。塗装あるいは表面処理の後、第２図に示すよ
うに、ポンチ10を鋳抜き穴９に打ち込んで薄肉８を抜き
とることによって鋳抜き穴5a,5bにエア抜き孔が備えら
れる。これにより温度変化によっても内圧が変化するこ
となく、ガスケット３の破損などを防ぐことができる。On the outer surface of the cylinder block wall 7 that separates the cast hole 5a and the cylinder block outer surface 6, a small diameter cast hole 9 is formed that is recessed inward and leaves a thin wall 8 on the inner bottom surface.
Due to the presence of the casting hole 9, the cylinder block 1
When the crankcase 2 and the crankcase 2 are joined, the sealing of the cast holes 5a and 5b does not collapse. Although the assembled form is sent to the coating process or the marine treatment process, the degreasing liquid, the deoxidizing liquid or the surface treatment liquid does not enter the casting holes 5a and 5b due to the pretreatment. After painting or surface treatment, as shown in FIG. 2, the punch 10 is driven into the casting hole 9 and the thin wall 8 is removed, so that the casting holes 5a and 5b are provided with air vent holes. As a result, the internal pressure does not change even if the temperature changes, and damage to the gasket 3 can be prevented.
次に、第３図はＶ型多気筒エンジンの構成を示す縦断側
面図、第４図は第３図Ａ矢視のシリンダブロック後面
図、第５図は同じくＢ矢視のシリンダブロック底面図で
ある。Next, FIG. 3 is a vertical sectional side view showing the structure of a V-type multi-cylinder engine, FIG. 4 is a rear view of the cylinder block as viewed in the direction of arrow A of FIG. 3, and FIG. is there.
シリンダブロック11はアルミダイキャスト製で、シリン
ダスリーブと挿嵌されたボア12a,12b,12cが並設され
る。13a,13b,13cは吸気通路、14a,14b,14cは掃気通路で
ある。隣り合ったボア12aと12bおよび12bと12cの間で吸
気通路13aと掃気通路14bおよび吸気通路13bと掃気通路1
4cを隔てる肉厚部には下面のクランクケース15との接合
面16に開口する減肉用の鋳抜き穴17が形成されている。
この鋳抜き穴17はクランクケース15が接合されたときは
密閉室となる。The cylinder block 11 is made of aluminum die cast, and the cylinder sleeve and the bores 12a, 12b, 12c inserted therein are arranged in parallel. 13a, 13b and 13c are intake passages, and 14a, 14b and 14c are scavenging passages. The intake passage 13a and the scavenging passage 14b and the intake passage 13b and the scavenging passage 1 are provided between the adjacent bores 12a and 12b and 12b and 12c.
A casting hole 17 for reducing the wall thickness is formed in the thick portion separating the 4c and is opened in the joint surface 16 with the crankcase 15 on the lower surface.
The cast hole 17 becomes a closed chamber when the crankcase 15 is joined.
次に、上記鋳抜き穴17とシリンダブロック11外表面とを
隔てるシリンダブロック壁18のその外表面19には、奥底
面に薄肉20を残した小径の鋳抜き穴21が形成される。Next, on the outer surface 19 of the cylinder block wall 18 that separates the casting hole 17 from the outer surface of the cylinder block 11, a small diameter casting hole 21 with a thin wall 20 left on the inner bottom surface is formed.
上記構成は後バンクシリンダ11aにおいても同様であ
る。Ｖ型に組付けられたときは、前バンク、後バンクシ
リンダブロック11a,11bは対称的に配置され、したがっ
て鋳抜き穴21は両者の対向面に向き合って位置する。塗
装工程には鋳抜き穴17を密閉したアッセンブリの形で行
なわれる。塗装後にポンチによって薄肉20を打ち抜き、
鋳抜き穴21は鋳抜き穴17のエア抜き穴（第３図示）に変
化する。上記のように鋳抜き穴21がＶ型配置の狭い空間
に配置されていても、ポンチでの打抜き作業が容易であ
る。The above configuration is the same for the rear bank cylinder 11a. When assembled in a V-shape, the front bank and rear bank cylinder blocks 11a, 11b are symmetrically arranged, and therefore the casting hole 21 is positioned so as to face the opposing surfaces of the two. The painting process is performed in the form of an assembly in which the casting hole 17 is sealed. After painting, punch out the thin 20 with a punch,
The casting hole 21 is changed to an air bleeding hole (shown in FIG. 3) of the casting hole 17. Even if the casting hole 21 is arranged in the narrow space of the V-shaped arrangement as described above, the punching work with the punch is easy.
上記の通り、この発明に係る船外機のシリンダブロック
は、減肉用の鋳抜き穴に対し、外表部面から薄肉を残し
た小径の鋳抜き穴を臨ませたもので、塗装工程などでは
密閉状態を保持し、後に簡単にエア抜き孔に形成するこ
とができ、複雑な形状を持つ船外機のシリンダブロック
にエア抜き孔を備えた多様の減肉用鋳抜き穴を作業性よ
く配置することができ、船外機エンジンのシリンダブロ
ックの軽量化、コストダウンに大いに役立つ効果があ
る。As described above, the cylinder block of the outboard motor according to the present invention is a casting hole for thinning, which has a small-diameter casting hole facing the outer surface and is left thin. Maintains a closed state and can be easily formed into an air vent hole later, and arranges various thinning casting holes with air vent holes in the cylinder block of an outboard motor with a complicated shape with good workability. It is possible to reduce the weight and cost of the cylinder block of the outboard engine.
第１図はこの発明に係る船外機のシリンダブロック実施
例を原理的に示した要部の縦断面図、第２図は上記シリ
ンダブロックのエア抜き孔部の拡大した断面図、第３図
はこの発明の実施例を示すもので船外機のＶ型多気筒エ
ンジンの要部を示す縦断面図、第４図は第３図Ａ矢視の
シリンダブロック後面図、第５図は第３図Ｂ矢視のシリ
ンダブロック底面図である。 1,11……シリンダブロック、2,15……クランクケース、
5a,5b,17……鋳抜き穴、8,20……薄肉、9,21……（エア
抜き用）鋳抜き穴、10……ポンチ。FIG. 1 is a longitudinal sectional view of an essential part showing in principle an embodiment of a cylinder block of an outboard motor according to the present invention, FIG. 2 is an enlarged sectional view of an air vent hole portion of the cylinder block, and FIG. Shows an embodiment of the present invention and is a longitudinal sectional view showing a main part of a V-type multi-cylinder engine of an outboard motor, FIG. 4 is a rear view of a cylinder block as viewed in the direction of arrow A of FIG. 3, and FIG. It is a cylinder block bottom view of the arrow B of FIG. 1,11 …… Cylinder block, 2,15 …… Crankcase,
5a, 5b, 17 …… Casting hole, 8,20 …… Thin wall, 9,21 …… (for air bleeding) Casting hole, 10 …… Punch.
Claims (1)
される重量軽減用の鋳抜き穴を持つ船外機のシリンダブ
ロックにおいて、その鋳抜き穴と外表との間のシリンダ
ブロック壁の外表面に、奥底面に薄肉を残した小径の鋳
抜き穴を形成してなることを特徴とする船外機のシリン
ダブロック。1. A cylinder block of an outboard motor having a casting hole for weight reduction, which is hermetically sealed by joining with a crankcase or the like, in an outer surface of a cylinder block wall between the casting hole and the outer surface, A cylinder block for an outboard motor, characterized in that a small-diameter cast hole having a thin wall is formed on the inner bottom surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12802186A JPH0792019B2 (en) | 1986-06-04 | 1986-06-04 | Cylinder block for outboard motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12802186A JPH0792019B2 (en) | 1986-06-04 | 1986-06-04 | Cylinder block for outboard motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62284945A JPS62284945A (en) | 1987-12-10 |
| JPH0792019B2 true JPH0792019B2 (en) | 1995-10-09 |
Family
ID=14974525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12802186A Expired - Lifetime JPH0792019B2 (en) | 1986-06-04 | 1986-06-04 | Cylinder block for outboard motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0792019B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4570495B2 (en) * | 2005-03-24 | 2010-10-27 | 本田技研工業株式会社 | Air vent structure for water-cooled internal combustion engine |
-
1986
- 1986-06-04 JP JP12802186A patent/JPH0792019B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62284945A (en) | 1987-12-10 |
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