JPH0148387B2 - - Google Patents
Info
- Publication number
- JPH0148387B2 JPH0148387B2 JP25663984A JP25663984A JPH0148387B2 JP H0148387 B2 JPH0148387 B2 JP H0148387B2 JP 25663984 A JP25663984 A JP 25663984A JP 25663984 A JP25663984 A JP 25663984A JP H0148387 B2 JPH0148387 B2 JP H0148387B2
- Authority
- JP
- Japan
- Prior art keywords
- cooling
- cylinder head
- outlet
- cooling air
- cooling fan
- 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
- 238000001816 cooling Methods 0.000 claims description 120
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000003780 insertion Methods 0.000 description 6
- 230000037431 insertion Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P1/00—Air cooling
- F01P1/02—Arrangements for cooling cylinders or cylinder heads, e.g. ducting cooling-air from its pressure source to cylinders or along cylinders
-
- 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
- F02F1/28—Cylinder heads having cooling means for air cooling
- F02F1/30—Finned cylinder heads
- F02F1/34—Finned cylinder heads with means for directing or distributing cooling medium
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】
産業上の利用分野
この発明は、空冷式内燃機関のシリンダヘツド
に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a cylinder head for an air-cooled internal combustion engine.
従来の技術
従来、空冷式内燃機関の冷却方式としては、冷
却フアンと反対側より冷却風を吸込んで、該冷却
フアン側へ向けて冷却風を流す吸込み型の冷却方
式と、逆に冷却フアン側よりその反対側へ冷却風
を流す押込み型冷却方式とがある。例えば、防音
ケース等によつて囲まれていない標準型の内燃機
関では押込み型の冷却方式が、他方、防音ケース
によつて囲まれた防音型内燃機関においては、吸
込み型の冷却方式が用いられている。Conventional technology Conventionally, the cooling methods for air-cooled internal combustion engines include a suction type cooling method in which cooling air is sucked in from the side opposite to the cooling fan and the cooling air is directed toward the cooling fan, and a suction type cooling method in which the cooling air is directed toward the cooling fan side. There is also a push-in type cooling system in which the cooling air is directed to the opposite side. For example, a standard internal combustion engine that is not surrounded by a soundproof case uses a push-in type cooling system, while a soundproof internal combustion engine that is surrounded by a soundproof case uses a suction type cooling system. ing.
また、シリンダヘツドには、該シリンダヘツド
内を通る冷却風通路が形成されて、冷却フアンに
よる冷却風をこの冷却風通路を通つて流すように
しているが、この場合、押込み型冷却方式と吸込
み型冷却方式とでは、該冷却風通路の形状も異な
つたものとしなければならない。即ち、一般に押
込み型方式の場合には、冷却フアンによつてエネ
ルギーを与えられた動圧のため冷却風の直進性が
強く、そのため、最も熱負荷の大きい弁間部側へ
冷却風を導くよう、この弁間部へ向けて通路を形
成する必要がある。他方、吸込み型冷却方式にお
いては、冷却風自体はエネルギーを与えられてい
ないため、吸込み側即ち入口部分の面積を出来る
だけ多くして、冷却風量を多くする必要がある。 In addition, a cooling air passage is formed in the cylinder head, and the cooling air from the cooling fan is made to flow through this cooling air passage. Depending on the mold cooling method, the shape of the cooling air passage must also be different. In other words, in the case of a push-in type system, the cooling air is generally directed in a straight line due to the dynamic pressure given energy by the cooling fan, and therefore the cooling air is directed toward the area between the valves where the heat load is greatest. , it is necessary to form a passage toward this valve space. On the other hand, in the suction type cooling system, since the cooling air itself is not given energy, it is necessary to increase the area of the suction side, that is, the inlet portion, to increase the amount of cooling air.
従来においては、このような要求に応えるた
め、押込み型冷却方式と吸込み型冷却方式の双方
に合わせてシリンダヘツドを製作し、夫々別のシ
リンダヘツドを用いることとしてこれに対処して
いた。 In the past, in order to meet these demands, cylinder heads were manufactured for both the forced cooling system and the suction cooling system, and separate cylinder heads were used for each.
発明が解決しようとする問題点
しかしながら、上記従来の構造においては、押
込み方式と吸込み方式の双方に合わせて２種類の
シリンダヘツドが必要となり、コスト高となる欠
点を有している。そこで、この発明は、かかる欠
点を解消して、押込み方式と吸込み方式の双方に
同一のシリンダヘツドを兼用できるようにして、
シリンダヘツドの製作コストを低減することを目
的としている。Problems to be Solved by the Invention However, the above-mentioned conventional structure requires two types of cylinder heads for both the push-in type and the suction type, which has the disadvantage of increasing costs. Therefore, the present invention solves this drawback by making it possible to use the same cylinder head for both the push type and the suction type.
The purpose is to reduce the production cost of cylinder heads.
問題点を解決するための手段
このような目的を達成するため、この発明で
は、第１図及び第２図で示すように、シリンダヘ
ツド３の側方に冷却フアン１０を配設し、同じく
シリンダヘツド３の前記冷却フアン１０と反対側
に開口した入口１９，２０，２３から、該冷却フ
アン１０側出口に至る冷却風通路２２，２５を形
成し、上記入口１９，２０，２３から出口２１，
２４を通つて冷却フアン１０側へ冷却風を流す吸
込み型冷却方式に対し、冷却フアン１０から上記
出口２１，２４を通つて入口１９，２０，２３側
へ冷却風を流す押込み型冷却方式のとき、シリン
ダヘツド３内の弁間部側へ冷却風を集中さすべく
前記一部の入口１９，２０を塞ぐことにより、同
一のシリンダヘツド３を吸込み型冷却方式と押込
み型冷却方式の双方へ兼用可能としたことを特徴
としている。Means for Solving the Problems In order to achieve such an object, in the present invention, as shown in FIGS. 1 and 2, a cooling fan 10 is disposed on the side of the cylinder head 3, and Cooling air passages 22, 25 are formed from inlets 19, 20, 23 opened on the opposite side of the cooling fan 10 of the head 3 to an outlet on the side of the cooling fan 10, and from the inlets 19, 20, 23 to the outlet 21,
In contrast to the suction type cooling method in which cooling air flows through the cooling fan 10 side through the cooling fan 10, the push type cooling method in which the cooling air flows from the cooling fan 10 to the inlets 19, 20, and 23 through the above-mentioned outlets 21 and 24. By blocking some of the inlets 19 and 20 in order to concentrate the cooling air to the side between the valves in the cylinder head 3, the same cylinder head 3 can be used for both the suction type cooling system and the push type cooling system. It is characterized by the following.
作 用
押込み方式の場合には、該押込み方式のときに
出口側となる一部の入口１９，２０が塞がれ、そ
のため、冷却フアン１０側より押し出された冷却
風が弁間部を通るよう向きを変更され、他方、吸
込み型冷却方式の場合には、上記入口１９，２０
を開放し、これによつて、入口の開口全面積が増
大され、大量の冷却風を吸込むことができる。In the case of the push-in method, some of the inlets 19 and 20 on the outlet side are blocked, so that the cooling air pushed out from the cooling fan 10 side passes through the valve gap. On the other hand, in the case of a suction type cooling system, the above-mentioned inlets 19, 20
This increases the total area of the inlet opening and allows a large amount of cooling air to be sucked in.
実施例
以下、この発明の構成を図示の実施例に基づい
て説明すると、第２図は、吸込み型冷却方式を採
用した場合のエンジンの全体を示し、図において
１はクランクケース、２はシリンダボデイ、３
は、該シリンダボデイ２の上部に載置されたシリ
ンダヘツド、４は、該シリンダヘツド３の上部に
取付けられた弁腕室ケースを示している。シリン
ダヘツド３の左右方向の一方、即ち、左側の側面
には、排気管５がそのフランジ６部において取付
けられ、その反対側即ち右側の側面には、吸気管
７が取付けられている。８は、該吸気管７の管端
へ取付けたエアクリーナである。また、この吸気
管７と同じ側には、シリンダヘツド側方下部に、
クランク軸９の端部に冷却フアン１０が取付けら
れている。１１は、この冷却フアン１０の羽根部
分を覆うスクロールであり、更に、このスクロー
ル１１とエンジン本体側との間に跨つてフアンケ
ース１２が取付けられている。１３は、前記冷却
フアン１０の反対側において、エンジンへ連結し
た作業機としての発電機を示している。Embodiment Below, the configuration of the present invention will be explained based on the illustrated embodiment. FIG. 2 shows the entire engine when a suction type cooling system is adopted. ,3
2 shows a cylinder head placed on the top of the cylinder body 2, and 4 shows a valve arm chamber case attached to the top of the cylinder head 3. An exhaust pipe 5 is attached at a flange 6 to one side of the cylinder head 3 in the left and right direction, that is, the left side, and an intake pipe 7 is attached to the opposite side, that is, the right side. 8 is an air cleaner attached to the end of the intake pipe 7. Also, on the same side as this intake pipe 7, at the lower side of the cylinder head,
A cooling fan 10 is attached to the end of the crankshaft 9. Reference numeral 11 denotes a scroll that covers the blade portion of the cooling fan 10, and a fan case 12 is further attached to span between the scroll 11 and the engine main body side. Reference numeral 13 indicates a generator as a working machine connected to the engine on the opposite side of the cooling fan 10.
この吸込み型冷却方式における冷却風は、上記
冷却フアン１０と反対側におけるシリンダヘツド
３の左側側面より、該シリンダヘツド３を通つて
吸気管７に一体形成した冷却風ガイド２９より、
冷却フアンケース１２内へ入り、前記スクロール
１１を通つて外部へ排出される。 In this suction type cooling system, the cooling air flows from the left side of the cylinder head 3 on the side opposite to the cooling fan 10, passes through the cylinder head 3, and flows from the cooling air guide 29 integrally formed with the intake pipe 7.
It enters the cooling fan case 12, passes through the scroll 11, and is discharged to the outside.
第１図が、上記シリンダヘツド３内の構造を示
している。１５，１６は、シリンダヘツド３の中
央部において左右に並設した排気弁挿入穴と吸気
弁挿入穴である。１７は、前記排気弁挿入穴１５
に連通し、かつ、その出口をシリンダヘツド３の
左側側面に開口した排気通路を示している。他
方、吸気弁挿入穴１６に連通して吸気通路１８が
形成され、この吸気通路１８の入口部がシリンダ
ヘツド３の右側側面に開口している。 FIG. 1 shows the structure inside the cylinder head 3. As shown in FIG. Reference numerals 15 and 16 denote an exhaust valve insertion hole and an intake valve insertion hole, which are arranged side by side on the left and right in the center of the cylinder head 3. 17 is the exhaust valve insertion hole 15
The figure shows an exhaust passage that communicates with the cylinder head 3 and has an outlet opening on the left side surface of the cylinder head 3. On the other hand, an intake passage 18 is formed in communication with the intake valve insertion hole 16, and an inlet portion of this intake passage 18 opens on the right side surface of the cylinder head 3.
排気通路１７の後部側には、前後一対の入口１
９，２０がシリンダヘツド３の左側側面に開口形
成され、この２個の入口１９，２０を合流させ
て、前記吸気通路１８の後部側において、シリン
ダヘツド３の右側側面に開口する出口２１へ流れ
る１つの後部側冷却風通路２２を形成している。
他方、排気通路１７と吸気通路１８の前部側に
は、シリンダヘツド３左側側面の入口２３より右
側側面の出口２４へ略直線状に流れる前部側冷却
風通路２５が形成してある。更に、これら後部側
冷却風通路２２と前部側冷却風通路２５とは、上
記排気弁挿入穴１５と吸気弁挿入穴１６間の弁間
部通路２６を介して共に連通されている。 A pair of front and rear inlets 1 are provided on the rear side of the exhaust passage 17.
9 and 20 are formed as openings on the left side of the cylinder head 3, and these two inlets 19 and 20 are merged to flow into an outlet 21 that opens on the right side of the cylinder head 3 at the rear side of the intake passage 18. One rear side cooling air passage 22 is formed.
On the other hand, on the front side of the exhaust passage 17 and the intake passage 18, a front side cooling air passage 25 is formed which flows substantially linearly from an inlet 23 on the left side of the cylinder head 3 to an outlet 24 on the right side. Further, the rear cooling air passage 22 and the front cooling air passage 25 are in communication with each other via an intervalve passage 26 between the exhaust valve insertion hole 15 and the intake valve insertion hole 16.
なお、上記冷却風通路２２，２５の入口１９，
２２，２３及び出口２１，２４の名称は、吸込み
型方式の場合を基準として呼称したものであり、
押込み型の場合は、出口２１，２４が入口とな
り、１部の入口２３が出口となるが、この明細書
では一応の識別のため上記の如く呼称する。 Note that the inlet 19 of the cooling air passages 22, 25,
The names of 22, 23 and the outlets 21, 24 are based on the case of the suction type system,
In the case of the push-in type, the outlets 21 and 24 serve as inlets, and a portion of the inlet 23 serves as an outlet, but in this specification they are referred to as above for the purpose of identification.
さて、この第１図は、前記第２図の場合とは逆
に、押込み型冷却方式に用いる場合を示してお
り、前後の冷却風通路２２，２５のうち、後部側
冷却風通路２２の入口１９，２０は、その一方２
０は、専用の蓋板２７により、他方１９は、排気
管５のフランジ６と一体形成した蓋板２８によつ
て共に閉塞されている。図の実線矢印がこの場合
の冷却風の流れを示しており、冷却フアン１０側
即ちシリンダヘツド３右側側面に形成した出口２
１，２４より入つた冷却風は、前部側冷却風通路
２５においては、その出口２４側より入口２３側
に向けてそのまま略直線状に流れる。他方、後部
側冷却風通路２２においては、その出口である入
口１９，２０が塞がれているため、シリンダヘツ
ド３側面の出口２１より入つた冷却風は、この入
口１９，２０よりは出ることができず、そのた
め、前記弁間部通路２６を通つて、前部側冷却風
通路２３側へ流れ、これによつて弁間部を集中的
に冷却する。即ち、押込み型冷却方式の場合、冷
却風の直進性が強いため、前記蓋板２７，２８を
取付けない場合には、後部側出口２１より入つた
冷却風がそのまま入口１９，２１より流れでて、
弁間部の冷却を充分行ない得ないのであるが、こ
のように各入口１９，２０を塞ぐことによつて弁
間部へ冷却風を集中させるよう導き、冷却効果を
あげることができる。 Now, this FIG. 1 shows a case where the push-in cooling method is used, contrary to the case of FIG. 19 and 20 are on the other hand 2
0 is closed by a dedicated cover plate 27, and the other 19 is closed by a cover plate 28 integrally formed with the flange 6 of the exhaust pipe 5. The solid line arrows in the figure indicate the flow of cooling air in this case, and the outlet 2 is formed on the cooling fan 10 side, that is, on the right side of the cylinder head 3.
In the front side cooling air passage 25, the cooling air entering from the front cooling air passages 1 and 24 flows in a substantially straight line from the outlet 24 side to the inlet 23 side. On the other hand, in the rear side cooling air passage 22, the inlets 19 and 20, which are its outlets, are blocked, so the cooling air that enters through the outlet 21 on the side of the cylinder head 3 cannot exit through these inlets 19 and 20. Therefore, the air flows through the inter-valve passage 26 to the front side cooling air passage 23, thereby intensively cooling the inter-valve area. That is, in the case of the push-in type cooling system, since the cooling air tends to move straight, if the cover plates 27 and 28 are not attached, the cooling air that entered from the rear side outlet 21 will flow out from the inlets 19 and 21 as it is. ,
Although the area between the valves cannot be sufficiently cooled, by blocking each inlet 19, 20 in this way, the cooling air is directed to be concentrated in the area between the valves, thereby increasing the cooling effect.
他方、このシリンダヘツド３を吸込み型冷却方
式に用いる場合には、上記蓋板２７，２８を外
し、入口１９，２０を開口させる。このようにす
ることによつて、入口１９，２９，２３の全開口
面を増大させて、大量の冷却風を吸込み、吸込み
方式に必要とされる充分な冷却風を流すことがで
きる。この場合の冷却風の流れを１点鎖線で示
す。 On the other hand, when this cylinder head 3 is used in a suction type cooling system, the cover plates 27 and 28 are removed and the inlets 19 and 20 are opened. By doing so, the total opening area of the inlets 19, 29, 23 can be increased, a large amount of cooling air can be sucked in, and a sufficient amount of cooling air required for the suction method can flow. The flow of cooling air in this case is shown by a dashed line.
第３図以下は、上記出口２１，２４側に取付け
る冷却風ガイドの構造とその取付け構造を示して
いる。 FIG. 3 and subsequent figures show the structure of the cooling air guide attached to the outlets 21 and 24 and its mounting structure.
第３図は、吸込み型冷却方式の場合のガイド２
９，２９を示しており、これらのガイド２９，２
９は、夫々吸気管７の前後両側に一体に形成され
ており、吸気管７の取付けに際し、両ガイド２
９，２９が、シリンダヘツド３の出口２１，２４
全面を覆うようにして取付けられる。なお、シリ
ンダヘツド３側には、前部側出口２４の前部側口
端部が切欠３１されて、上記前部側ガイド２９を
この出口２４へ合致させると、この部分に隙間を
生じるようにしている。これは、シリンダヘツド
３の前部側に冷却の必要な燃料タンク（図示せ
ず）が位置している場合において、この燃料タン
ク側へも冷却風を流すためであり、したがつて、
そのような冷却の必要な部品がない場合には、こ
の部分をグロメツト等によつて塞いでおく。 Figure 3 shows guide 2 for the suction type cooling system.
9,29, and these guides 29,2
9 are integrally formed on both the front and rear sides of the intake pipe 7, and when installing the intake pipe 7, both guides 2
9, 29 are the outlets 21, 24 of the cylinder head 3
It can be installed to cover the entire surface. Furthermore, on the cylinder head 3 side, a notch 31 is formed at the front end of the front side outlet 24, so that when the front side guide 29 is aligned with this outlet 24, a gap is created in this part. ing. This is because when a fuel tank (not shown) that requires cooling is located on the front side of the cylinder head 3, cooling air is also flowed to this fuel tank side.
If there are no parts that require such cooling, close this part with a grommet or the like.
第４図は、押込み型冷却方式の場合に用いられ
るガイド３２，３２を示しており、前記と同様
に、この場合のガイド３２，３２も吸気管７の前
後両側に一体に形成されるが、前部側ガイド３２
は吸込み型の場合の前部側ガイド２９に比較して
その高さを低くしてある。従つて、この押込み型
冷却方式の場合のガイド３２，３２を取付けた場
合、前部側出口２４と前部側ガイド３２との間に
は、その上端部分に開口隙間３３を生ずる。この
ようにした理由は次のとおりである。 FIG. 4 shows the guides 32, 32 used in the case of the push-in type cooling system, and similarly to the above, the guides 32, 32 in this case are also integrally formed on both the front and rear sides of the intake pipe 7. Front side guide 32
The height of the guide 29 is lower than that of the front guide 29 of the suction type. Therefore, when the guides 32, 32 for this push type cooling system are attached, an opening gap 33 is created between the front side outlet 24 and the front side guide 32 at the upper end thereof. The reason for doing this is as follows.
即ち、第１図で示すように、押込み型冷却のと
き、この前部側出口２４より入つた冷却風は、そ
のまま略直線状に流れて前部側入口２３より外部
へ排出される。他方、後部側出口２１より入つた
冷却風は、途中で直角方向に屈曲されて弁間部通
路１６を通り、前部側冷却風通路２５へ合流して
共に入口２３より配置されるが、このとき、前部
側冷却風通路２３の冷却風量が多く直進性が強い
と、弁間部通路２６を通つて流れてくる風量が減
少し、そのため、該弁間部の冷却風を充分行ない
得なくなる。そこで、この実施例では、この直進
側前部側冷却風通路２５の出口２４（入口）面積
を減少させ、これによつて、該前部側冷却風通路
２５の流量を少なくしたものである。 That is, as shown in FIG. 1, during push-in cooling, the cooling air that enters from the front side outlet 24 flows in a substantially straight line and is discharged to the outside from the front side inlet 23. On the other hand, the cooling air that enters from the rear outlet 21 is bent at right angles on the way, passes through the intervalve passage 16, joins the front cooling air passage 25, and is disposed from the inlet 23. At this time, if the amount of cooling air in the front side cooling air passage 23 is large and the straightness is strong, the amount of air flowing through the valve space passage 26 decreases, and therefore, the cooling air cannot be sufficiently cooled in the space between the valves. . Therefore, in this embodiment, the area of the outlet 24 (inlet) of the straight forward cooling air passage 25 is reduced, thereby reducing the flow rate of the front cooling air passage 25.
発明の効果
以上の如く、この発明によれば、押込み型冷却
方式の場合には、その出口側となる一部の入口を
塞ぐことによつて弁間部側へ冷却風量を多く流
し、他方、吸込み型冷却方式の場合には、前記入
口を開放することによつて、該吸込み方の場合に
必要される風量を充分確保できるから、仮に、上
記入口を塞ぐための蓋板やガイド等を取り替える
必要があるとしてもこれらは小物部品であり、シ
リンダヘツド自身を取り替える場合に比較して、
遥かに低コストで製作できるという効果がある。Effects of the Invention As described above, according to the present invention, in the case of a push-in type cooling system, a large amount of cooling air is allowed to flow toward the valve gap side by blocking a part of the inlet serving as the outlet side, and, on the other hand, In the case of a suction type cooling method, by opening the inlet, the air volume required for the suction method can be secured sufficiently, so temporarily replace the cover plate, guide, etc. to block the inlet. Even if necessary, these are small parts, and compared to replacing the cylinder head itself,
The effect is that it can be produced at a much lower cost.
第１図は本発明シリンダヘツドの水平断面図、
第２図はエンジン全体の要部縦断正面図、第３図
はシリンダヘツドへのガイドの取付け構造を示す
分解斜視図、第４図は押込み型冷却方式の場合の
ガイドの斜視図である。
３……シリンダヘツド、１０……冷却フアン、
１９，２０，２３……入口、２１，２４……出
口、２２，２５……冷却風通路、２６……弁間部
通路、２９，３２……ガイド。
FIG. 1 is a horizontal sectional view of the cylinder head of the present invention;
FIG. 2 is a longitudinal sectional front view of essential parts of the entire engine, FIG. 3 is an exploded perspective view showing the mounting structure of the guide to the cylinder head, and FIG. 4 is a perspective view of the guide in the case of the push type cooling system. 3...Cylinder head, 10...Cooling fan,
19, 20, 23... Inlet, 21, 24... Outlet, 22, 25... Cooling air passage, 26... Valve passage, 29, 32... Guide.
Claims (1)
し、同じくシリンダヘツドの前記冷却フアンと反
対側に開口した入口から該冷却フアン側出口に至
る冷却風通路を形成し、上記入口から出口を通つ
て冷却フアン側へ冷却風を流す吸込み型冷却方式
に対し、冷却フアンから上記出口を通つて入口側
へ冷却風を流す押込み型冷却方式のとき、シリン
ダヘツド内の弁間部側へ冷却風を導くよう前記一
部の入口を塞ぐことにより、同一のシリンダヘツ
ドを吸込み型冷却方式と押込み型冷却方式の双方
へ兼用可能としたことを特徴とする空冷式内燃機
関のシリンダヘツド。 ２ シリンダヘツドの前記出口側側面へ、該出口
と冷却フアンとを連絡するガイドを取付けるもの
において、上記出口の全面積を冷却フアン側へ連
絡させる吸込み型冷却方式用のガイドと、同じく
出口の一部のみ冷却フアン側へ連絡させる押込み
型冷却方式用のガイドとを選択取付けすることを
特徴とする特許請求の範囲第１項記載の空冷式内
燃機関のシリンダヘツド。[Scope of Claims] 1. A cooling fan is disposed on the side of the cylinder head, and a cooling air passage is formed from an inlet opening on the side opposite to the cooling fan of the cylinder head to an outlet on the side of the cooling fan. In contrast to the suction type cooling system in which cooling air flows from the inlet to the cooling fan side through the outlet, in the case of the push type cooling system in which cooling air flows from the cooling fan to the inlet side through the above-mentioned outlet, the area between the valves in the cylinder head. A cylinder head for an air-cooled internal combustion engine, characterized in that the same cylinder head can be used for both a suction type cooling system and a forced type cooling system by blocking said part of the inlet so as to guide cooling air to the side. . 2. A guide for connecting the outlet and the cooling fan is attached to the side surface of the cylinder head on the outlet side, and a guide for the suction type cooling system that connects the entire area of the outlet to the cooling fan side and a guide for the suction type cooling system that connects the entire area of the outlet to the cooling fan side, 2. A cylinder head for an air-cooled internal combustion engine according to claim 1, wherein a guide for a push-in type cooling system is selectively attached so that only a portion of the cylinder head communicates with a cooling fan side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25663984A JPS61135960A (en) | 1984-12-04 | 1984-12-04 | Cylinder head for air-cooled type internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25663984A JPS61135960A (en) | 1984-12-04 | 1984-12-04 | Cylinder head for air-cooled type internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61135960A JPS61135960A (en) | 1986-06-23 |
| JPH0148387B2 true JPH0148387B2 (en) | 1989-10-19 |
Family
ID=17295395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25663984A Granted JPS61135960A (en) | 1984-12-04 | 1984-12-04 | Cylinder head for air-cooled type internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61135960A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1775442B1 (en) * | 2004-07-22 | 2010-09-08 | Yanmar Co., Ltd. | Engine |
| CN101818701B (en) * | 2010-04-26 | 2015-05-27 | 隆鑫通用动力股份有限公司 | Valve arrangement structure for cylinder head of air-cooled diesel engine |
| CN101943076B (en) * | 2010-10-19 | 2011-12-28 | 无锡开普动力有限公司 | Cylinder cover cooling structure of engine |
| CN102400811B (en) * | 2011-12-19 | 2013-03-20 | 力帆实业(集团)股份有限公司 | Air cylinder head for three-air-valve engine |
-
1984
- 1984-12-04 JP JP25663984A patent/JPS61135960A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61135960A (en) | 1986-06-23 |
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| LAPS | Cancellation because of no payment of annual fees |