JPH0232849Y2 - - Google Patents
Info
- Publication number
- JPH0232849Y2 JPH0232849Y2 JP1931785U JP1931785U JPH0232849Y2 JP H0232849 Y2 JPH0232849 Y2 JP H0232849Y2 JP 1931785 U JP1931785 U JP 1931785U JP 1931785 U JP1931785 U JP 1931785U JP H0232849 Y2 JPH0232849 Y2 JP H0232849Y2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder head
- bracket
- pivot shaft
- head
- cooling air
- 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 38
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【考案の詳細な説明】
《産業上の利用分野》
本考案は空冷頭上弁エンジンのスキツシユエリ
ア冷却装置に関する。[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to a squish area cooling device for an air-cooled overhead valve engine.
《従来例》
従来、この種のものとして例えば実公昭57−
45365号公報に示すものがある。《Conventional example》 Conventionally, this kind of thing, for example,
There is one shown in Publication No. 45365.
これは第４図Ｂ及び第５図に示すように空冷頭
上弁エンジン１のシリンダヘツド４の内面の前部
に燃焼室１０、後部にスキツシユエリア１２を設
け、シリンダヘツド４の前側に吸・排気弁１４，
１５、後部にプツシユロツド２２、中間部にロツ
カアーム２３をそれぞれ一対づつ設け、両ロツカ
アーム２３を枢支軸２６を介してブラケツト２４
に揺動自在に枢支し、ブラケツト２４をシリンダ
ヘツド４の上面にヘツドボルト５で固定し、吸・
排気弁１４，１５とプツシユロツド２２との間の
シリンダヘツド４の中間肉壁部にスキツシユエリ
ア冷却風路２９を左右向きに貫通して構成し、図
外の送風装置から送給される冷却風を冷却風路２
９に通風してスキツシユエリア１２を冷却するよ
うにしてある。そして、ブラケツト２４を固定す
るヘツドボルト５はロツカアーム２３の両外側で
枢支軸２６の前側に位置させてある。 As shown in FIGS. 4B and 5, a combustion chamber 10 is provided at the front of the inner surface of the cylinder head 4 of the air-cooled overhead valve engine 1, and a squish area 12 is provided at the rear. exhaust valve 14,
15. A pair of push rods 22 are provided at the rear and a pair of locking arms 23 are provided at the intermediate portion, and both locking arms 23 are connected to a bracket 24 via a pivot shaft 26.
The bracket 24 is fixed to the top surface of the cylinder head 4 with a head bolt 5, and the suction
A squish area cooling air passage 29 is formed by penetrating left and right in the middle wall of the cylinder head 4 between the exhaust valves 14, 15 and the push rod 22, and is configured to pass cooling air from a blower device (not shown). Cooling air passage 2
The stocking area 12 is cooled by ventilation. Head bolts 5 for fixing the bracket 24 are located on both outer sides of the rocker arm 23 and in front of the pivot shaft 26.
《考案が解決しようとする問題点》
上記のように構成したものでは、枢支軸２６の
ブラケツト２４を固定するヘツドボルト５が枢支
軸２６より吸・排気弁１４，１５側に設けられる
ことから、第４図に示すようにヘツドボルト５と
吸・排気弁１４，１５との間の寸法Ｓが小さく、
この間のシリンダヘツド４の肉壁内に形成される
冷却風路２９を広く形成することができず、スキ
ツシユエリア１２を充分に冷却することがむずか
しかつた。その結果、エンジン１を高圧縮化又は
高速化する場合に、スキツシユエリア１２の過熱
で燃焼室１０内の混合気が早期着火してノツキン
グ起すという問題が生じる。<<Problems to be solved by the invention>> In the structure as described above, the head bolt 5 for fixing the bracket 24 of the pivot shaft 26 is provided closer to the intake/exhaust valves 14 and 15 than the pivot shaft 26. , the dimension S between the head bolt 5 and the intake/exhaust valves 14, 15 is small, as shown in FIG.
During this time, the cooling air passage 29 formed within the wall of the cylinder head 4 could not be made wide, making it difficult to sufficiently cool the squish area 12. As a result, when increasing the compression or speed of the engine 1, a problem arises in that the air-fuel mixture in the combustion chamber 10 is prematurely ignited due to overheating of the squish area 12, causing knocking.
加えて、ブラケツト２４がロツカアーム２３，
２３の両外側の枢支軸２６の端部に取付けられる
ことから、ブラケツト２３，２３同士間が長くな
り、大形化してしまうという問題があつた。 In addition, the bracket 24 is connected to the rocker arm 23,
Since the brackets 23 are attached to the ends of the pivot shafts 26 on both outer sides of the brackets 23, the distance between the brackets 23 and 23 becomes long, resulting in an increase in size.
本考案は上記問題点に鑑み提案されたもので、
スキツシユエリアを冷却する冷却風路を大きく形
成できるようにすることを主たる目的とする。 This invention was proposed in view of the above problems.
The main purpose is to be able to form a large cooling air passage to cool the stocking area.
《問題点を解決するための手段》
本考案は、上記目的を達成するために、例えば
第１図乃至第３図に示すように、ブラケツト２４
の前部に軸受孔２５を左右に貫通するとともに、
後部に取付孔２７を上下に貫通し、軸受孔２５に
枢支軸２６を左右に突出して枢支するとともに、
枢支軸２６の左右の各突出部に各ロツカアーム２
３，２３を枢支し、複数のうちの一本のヘツドボ
ルト５をスキツシユエリア冷却風路２９の後ろ側
で左右方向の略中央部に位置させるとともに、こ
のヘツドボルト５に取付孔２７を外嵌しブラケツ
ト２４をヘツドボルト５でシリンダヘツドの上面
に固定したものである。<<Means for Solving the Problems>> In order to achieve the above object, the present invention provides a bracket 24 as shown in FIGS. 1 to 3, for example.
A bearing hole 25 is passed through the front part from left to right, and
A mounting hole 27 is passed through the rear part vertically, and a pivot shaft 26 is protruded left and right into the bearing hole 25 to be pivotally supported.
Each rocker arm 2 is attached to each protrusion on the left and right sides of the pivot shaft 26.
3 and 23, one of the head bolts 5 is positioned approximately at the center in the left-right direction on the rear side of the skid area cooling air passage 29, and the mounting hole 27 is externally fitted to the head bolt 5. A bracket 24 is fixed to the upper surface of the cylinder head with head bolts 5.
《作用》
上記のように構成したスキツシユエリア冷却装
置は、枢支軸２６を支承するブラケツト２３の取
付孔２７が軸受孔２５より後方に設けられるの
で、軸受孔２７に挿通されるヘツドボルト５と
吸・排気弁１４，１５との間の寸法Ｓが大きく、
ここに形成するスキツシユエリア冷却用の冷却風
路２９を広く形成できる。<<Function>> In the skid area cooling device configured as described above, the mounting hole 27 of the bracket 23 that supports the pivot shaft 26 is provided rearward of the bearing hole 25, so that the head bolt 5 inserted into the bearing hole 27 and The dimension S between the intake and exhaust valves 14 and 15 is large,
The cooling air passage 29 for cooling the squish area formed here can be formed wide.
これにより、エンジン１の運転時にフライホイ
ルフアン２８で起風した冷却風が冷却路２９に多
量に供給されて、スキツシユエリア１２を強力に
冷却する。 As a result, a large amount of cooling air generated by the flywheel fan 28 during operation of the engine 1 is supplied to the cooling path 29, thereby powerfully cooling the squish area 12.
《実施例》
以下、本考案の実施例を図面に基づき説明す
る。<<Example>> Hereinafter, an example of the present invention will be described based on the drawings.
第１図はロツカアーム室の側面図、第２図はシ
リンダヘツドの燃焼室側の側面図、第３図は強制
頭上弁エンジンの横断平面図を示す。 1 shows a side view of the rocker arm chamber, FIG. 2 shows a side view of the cylinder head on the side of the combustion chamber, and FIG. 3 shows a cross-sectional plan view of the forced overhead valve engine.
図において、符号１はエンジン全体を示し、こ
のエンジン１はクランクケース２の左方にシリン
ダブロツク３を一体に形成し、シリンダブロツク
３の左側面にシリンダヘツド４を載置し、複数の
ヘツドボルト５で固定してある。 In the figure, reference numeral 1 indicates the entire engine, and this engine 1 includes a cylinder block 3 integrally formed on the left side of a crankcase 2, a cylinder head 4 mounted on the left side of the cylinder block 3, and a plurality of head bolts 5. It is fixed at
シリンダブロツク３のシリンダ６内にはピスト
ン７を上下摺動自在に収容してあり、このピスト
ン７はクランクケース２に回転自在に枢支したク
ランク軸８にコネクテイングロツド９で連結して
ある。 A piston 7 is housed in the cylinder 6 of the cylinder block 3 so as to be able to slide up and down, and the piston 7 is connected to a crankshaft 8 rotatably supported on the crankcase 2 by a connecting rod 9. .
シリンダヘツド４の内面のピストン７に対面す
る部分には凹入して形成した燃焼室１０と偏平な
スキツシユ面１１とを左右に並べて形成してあ
り、ピストン６の上面とスキツシユ面１１とでシ
リンダ５内にスキツシユエリア１２が形成され
る。燃焼室１０には点火栓１３と吸・排気弁１
４，１５とがそれぞれ設けてあり、吸・排気弁１
４，１５はシリンダヘツド４の上方のロツカアー
ム室１６に内装された動弁機構１７で開閉制御さ
れ、吸・排気ポート１８，１９と燃焼室１０との
連通を断続するようになつている。 A recessed combustion chamber 10 and a flat squishing surface 11 are formed side by side on the inner surface of the cylinder head 4 in a portion facing the piston 7. A squish area 12 is formed within 5. The combustion chamber 10 includes a spark plug 13 and an intake/exhaust valve 1.
4 and 15 are provided respectively, and the intake/exhaust valve 1
4 and 15 are controlled to open and close by a valve operating mechanism 17 housed in a rocker arm chamber 16 above the cylinder head 4, thereby opening and closing communication between the intake and exhaust ports 18 and 19 and the combustion chamber 10.
動弁機構１７はクランク軸８の回転に連動して
回転する動弁カム２０と動弁カム２０でタペツト
２１を介して突き上げ駆動されるプツシユロツド
２２及びプツシユロツド２２で揺動され吸・排気
弁１４，１５を押し下げるロツカアーム２３で構
成される。 The valve mechanism 17 includes a valve cam 20 that rotates in conjunction with the rotation of the crankshaft 8, a push rod 22 that is driven upward by the valve cam 20 through a tappet 21, and a push rod 22 that is oscillated by the push rod 22 to open the intake/exhaust valves 14, It is composed of a rocker arm 23 that pushes down 15.
このロツカアーム２３は、ロツカアーム室１６
に１本のヘツドボルト５でブラケツト２４を固定
し、ブラケツト２４に明けた軸受孔２５に枢支軸
２６を貫通させて支持させ、軸受孔２５から両外
方へ突出する枢支軸部分に揺動可能に枢支させて
ある。 This locking arm 23 is connected to the locking arm chamber 16.
The bracket 24 is fixed with one head bolt 5, and the pivot shaft 26 is passed through the bearing hole 25 formed in the bracket 24 to be supported, and the pivot shaft portion protruding outward from the bearing hole 25 swings. It is supported as possible.
ブラケツト２４を固定するヘツドボルト５はブ
ラケツト２４のプツシユロツド２２側の側面に形
成した取付孔２７から挿通され、シリンダヘツド
４を貫通し、シリンダブロツク３に螺締される。 A head bolt 5 for fixing the bracket 24 is inserted through a mounting hole 27 formed in the side surface of the bracket 24 on the push rod 22 side, passes through the cylinder head 4, and is screwed onto the cylinder block 3.
スキツシユ面１１とロツカアーム室１６との間
のシリンダヘツド４の肉壁内には、クランク軸８
の先端に固着した冷却フアン２８で起風した冷却
風の一部を通風してスキツシユエリア１２を冷却
するためと冷却風路２９が設けられている。 A crankshaft 8 is disposed within the wall of the cylinder head 4 between the locking surface 11 and the rocker arm chamber 16.
A cooling air passage 29 is provided to cool the stock area 12 by passing through a portion of the cooling air generated by a cooling fan 28 fixed to the tip of the cooling fan 28 .
この冷却風路２９は、シリンダヘツド４を前後
に貫通する状態に形成してあり、通路巾Ｗはブラ
ケツト２４を固定するヘツドボルト５の近傍から
吸・排気ポート１８，１９近傍に亘るスキツシユ
エリア１２の上方に形成してある。 This cooling air passage 29 is formed to pass through the cylinder head 4 in the front and rear directions, and the passage width W is the width of the passageway 29 extending from the vicinity of the head bolt 5 that fixes the bracket 24 to the vicinity of the intake/exhaust ports 18 and 19 in the skid area 12. It is formed above.
このとき、ブラケツト２４を固定するヘツドボ
ルト５の取付孔２７がプツシユロツド２２側のブ
ラケツト２４側に設けてあることから、ヘツドボ
ルト５と吸・排気弁１４，１５との間Ｓが広く形
成され、ここに形成される冷却風路２９の通路巾
Ｗは大きく形成することができる。 At this time, since the mounting hole 27 for the head bolt 5 that fixes the bracket 24 is provided on the bracket 24 side on the push rod 22 side, a wide space S is formed between the head bolt 5 and the intake/exhaust valves 14 and 15, The passage width W of the cooling air passage 29 formed can be made large.
また、冷却風路２９の高さＨは、スキツシユエ
リア１２の近くから、ロツカアーム室１６の底部
近くに亘つて高く形成され、前述の広い巾とで冷
却風路２９の通路断面積は広く大きく形成され
る。 Further, the height H of the cooling air passage 29 is formed high from near the squish area 12 to near the bottom of the rocker arm chamber 16, and due to the aforementioned wide width, the passage cross-sectional area of the cooling air passage 29 is wide and large. It is formed.
上記のように構成したスキツシユエリア冷却装
置は、冷却フアン２８で起風され、第３図想像線
Ａで示すようにシリンダヘツド４に供給された冷
却風の一部が冷却風路２９を流れ、シリンダヘツ
ド４のスキツシユ面１１を強力に冷却する。 In the squish area cooling device configured as described above, a part of the cooling air generated by the cooling fan 28 and supplied to the cylinder head 4 flows through the cooling air passage 29 as shown by the imaginary line A in FIG. , the squishing surface 11 of the cylinder head 4 is strongly cooled.
このとき、冷却風路２９の通路断面積が大きく
形成されていることから、多量の冷却風が冷却風
路２９を通風するのでスキツシユエリアを強力に
冷却する。 At this time, since the cooling air passage 29 has a large passage cross-sectional area, a large amount of cooling air passes through the cooling air passage 29, thereby powerfully cooling the squeezing area.
尚、第１図中、符号３０はブラケツトの吸・排
気弁１４，１５側に設けられたブラケツト位置決
め手段である。 In FIG. 1, reference numeral 30 is a bracket positioning means provided on the intake/exhaust valves 14, 15 side of the bracket.
《効果》
本考案は上記のように構成され作用するので次
の効果を奏する。<<Effects>> Since the present invention is constructed and operates as described above, it has the following effects.
即ち、スキツシユエリア冷却風路を広く形成す
ることができ、冷却風路に多量の冷却風を流して
スキツシユエリアを強力に冷却することができ
る。 That is, the squish area cooling air passage can be formed wide, and a large amount of cooling air can be flowed through the cooling air passage to powerfully cool the squish area.
これにより、スキツシユエリアの冷却不足によ
る早期着火を防止することができ、エンジンの高
圧縮化、高速回転化を図ることができる。 This makes it possible to prevent early ignition due to insufficient cooling of the squeezing area, and it is possible to achieve higher compression and higher speed rotation of the engine.
加えて、ブラケツトが吸・排気弁の間の枢支軸
の中央部に設けてあるので、吸・排気弁の外方で
枢支軸の両端部にブラケツトを設けた従来のもの
に較べて、枢支軸の軸心方向の巾を小さく形成す
ることができる。これにより、ロツカアーム室を
小さく形成して、エンジンを小形化することがで
きる。 In addition, since the bracket is provided at the center of the pivot shaft between the intake and exhaust valves, compared to the conventional system in which brackets are provided at both ends of the pivot shaft outside the intake and exhaust valves, The width of the pivot shaft in the axial direction can be made small. Thereby, the rocker arm chamber can be formed small and the engine can be downsized.
第１図乃至第３図は本考案の実施例を示し、第
１図はロツカアーム室の側面図、第２図はシリン
ダヘツドの底面図、第３図は強制空冷縦軸エンジ
ンの横断平面図であり、第４図及び第５図は従来
例を示す第１図及び第３図相当図である。
１……エンジン、４……シリンダヘツド、１０
……燃焼室、１２……スキツシユエリア、１４，
１５……吸・排気弁、２２……プツシユロツド、
２３……ロツカアーム、２４……ブラケツト、２
５……軸受孔、２６……枢支軸、２７……取付
孔、２９……冷却風路。
Figures 1 to 3 show an embodiment of the present invention, with Figure 1 being a side view of the rocker arm chamber, Figure 2 being a bottom view of the cylinder head, and Figure 3 being a cross-sectional plan view of the forced air-cooled vertical shaft engine. 4 and 5 are views corresponding to FIGS. 1 and 3 showing a conventional example. 1...Engine, 4...Cylinder head, 10
... Combustion chamber, 12 ... Squeeze area, 14,
15... Intake/exhaust valve, 22... Push rod,
23...Rotsuka arm, 24...Bracket, 2
5...Bearing hole, 26...Pivot shaft, 27...Mounting hole, 29...Cooling air path.
Claims (1)
面の前部に燃焼室１０、後部にスキツシユエリア
１２を設け、シリンダヘツド４の前側に吸・排気
弁１４，１５、後部にプツシユロツド２２、中間
部にロツカアーム２３をそれぞれ一対づつ設け、
両ロツカアーム２３を枢支軸２６を介してブラケ
ツト２４に揺動自在に枢支し、ブラケツト２４を
シリンダヘツド４の上面にヘツドボルト５で固定
し、吸・排気弁１４，１５とプツシユロツド２２
との間のシリンダヘツド４の中間肉壁部にスキツ
シユエリア冷却風路２９を左右向きに貫通して構
成した空冷頭上弁エンジンのスキツシユエリア冷
却装置において、ブラケツト２４の前部に軸受孔
２５を左右に貫通するとともに、後部に取付孔２
７を上下に貫通し、軸受孔２５に枢支軸２６を左
右に突出して枢支するとともに、枢支軸２６の左
右の各突出部に各ロツカアーム２３，２３を枢支
し、複数のうちの一本のヘツドボルト５をスキツ
シユエリア冷却風路２９の後ろ側で左右方向の略
中央部に位置させるとともに、このヘツドボルト
５に取付孔２７を外嵌してブラケツト２４をヘツ
ドボルト５でシリンダヘツドの上面に固定したこ
とを特徴とする空冷頭上弁エンジンのスキツシユ
エリア冷却装置。 A combustion chamber 10 is provided at the front of the inner surface of the cylinder head 4 of the air-cooled overhead valve engine 1, and a squish area 12 is provided at the rear.Intake/exhaust valves 14, 15 are provided at the front of the cylinder head 4, a push rod 22 is provided at the rear, and a push rod 22 is provided at the intermediate portion. A pair of rocker arms 23 are provided,
Both rocker arms 23 are swingably supported on a bracket 24 via a pivot shaft 26, and the bracket 24 is fixed to the upper surface of the cylinder head 4 with a head bolt 5.
In the squish area cooling device for an air-cooled overhead valve engine, in which a squish area cooling air passage 29 is passed through the middle wall of the cylinder head 4 in the left and right direction between the cylinder head 4 and the There are two mounting holes at the rear.
7 vertically, and a pivot shaft 26 protrudes left and right into the bearing hole 25 to be pivotally supported, and each rocker arm 23, 23 is pivotally supported on each of the left and right protrusions of the pivot shaft 26. One head bolt 5 is positioned approximately at the center in the left and right direction behind the skid area cooling air passage 29, the mounting hole 27 is fitted onto the head bolt 5, and the bracket 24 is attached to the upper surface of the cylinder head with the head bolt 5. A squeezing area cooling system for an air-cooled overhead valve engine, characterized in that it is fixed to the air-cooled overhead valve engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1931785U JPH0232849Y2 (en) | 1985-02-14 | 1985-02-14 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1931785U JPH0232849Y2 (en) | 1985-02-14 | 1985-02-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61136155U JPS61136155U (en) | 1986-08-25 |
| JPH0232849Y2 true JPH0232849Y2 (en) | 1990-09-05 |
Family
ID=30508781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1931785U Expired JPH0232849Y2 (en) | 1985-02-14 | 1985-02-14 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0232849Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7966987B2 (en) | 2005-06-23 | 2011-06-28 | Honda Motor Co., Ltd. | Air-cooled engine |
-
1985
- 1985-02-14 JP JP1931785U patent/JPH0232849Y2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7966987B2 (en) | 2005-06-23 | 2011-06-28 | Honda Motor Co., Ltd. | Air-cooled engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61136155U (en) | 1986-08-25 |
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