JPS6339766B2 - - Google Patents
Info
- Publication number
- JPS6339766B2 JPS6339766B2 JP13664280A JP13664280A JPS6339766B2 JP S6339766 B2 JPS6339766 B2 JP S6339766B2 JP 13664280 A JP13664280 A JP 13664280A JP 13664280 A JP13664280 A JP 13664280A JP S6339766 B2 JPS6339766 B2 JP S6339766B2
- Authority
- JP
- Japan
- Prior art keywords
- refrigerant
- exhaust
- passage
- cylinder head
- valve
- 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
- 239000003507 refrigerant Substances 0.000 claims description 30
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 8
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】
この発明は自動二輪車として好適な四行程多弁
式内燃機関に関するものであり、特にシリンダヘ
ツドを有効に冷却することを目的とするものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a four-stroke multi-valve internal combustion engine suitable for use in a motorcycle, and particularly aims to effectively cool a cylinder head.
多弁式内燃機関は、吸排気が容易であるため高
出力機関に用いられる。しかしながら、シリンダ
ヘツドの構造が複雑となりこれを空冷しようとし
ても十分な量の放熱面が得られず、排気弁の周辺
が過熱する傾向がある。 Multi-valve internal combustion engines are used for high-output engines because intake and exhaust are easy. However, the structure of the cylinder head is complicated, and even if an attempt is made to cool it with air, a sufficient amount of heat dissipation surface cannot be obtained, and the area around the exhaust valve tends to overheat.
そこで、シリンダヘツドを液冷することが考え
られるが、単にシリンダヘツドに冷媒を流す構造
では必ずしも排気弁付近の効果的な冷却が行えな
いおそれがある。 Therefore, it is conceivable to liquid-cool the cylinder head, but a structure in which refrigerant simply flows through the cylinder head may not necessarily be able to effectively cool the vicinity of the exhaust valve.
この発明は、シリンダヘツドの燃焼室近傍にジ
ヤケツトを設けて液冷にし、ジヤケツトをシリン
ダヘツド排気弁側の流入路および吸気弁側の流出
路を介して冷媒通路に連通すると共に、そこへ冷
媒を供給するポンプおよび冷媒タンクをシリンダ
ヘツドに設けて、ポンプを動弁カム機構を利用し
て駆動することにより、機関外形の大型化を最少
にしたものである。 This invention provides liquid cooling by providing a jacket near the combustion chamber of the cylinder head, communicates the jacket with a refrigerant passage through an inflow passage on the exhaust valve side of the cylinder head, and an outflow passage on the intake valve side, and also supplies refrigerant thereto. A supply pump and a refrigerant tank are provided in the cylinder head, and the pump is driven using a valve drive cam mechanism, thereby minimizing the increase in the external size of the engine.
以下、図示の実施例によつて本発明を説明す
る。図中1は機関の本体を示す。本体1はクラン
ク室2、シリンダ3およびシリンダヘツド4から
なつている。5はシリンダヘツド4へ接続された
吸気管、6は排気管である。シリンダヘツド4の
一側部の排気弁側には冷媒タンク7が配設されて
おり、吸気弁側にはトロコイド形のポンプ8が配
設されており、車体枠(図示してない)前方に設
置されるラジエータ9との間を冷媒通路11a,
11bによつて互に連通させてある。8aはポン
プ8の吸入通路、8bは吐出通路である。なお、
この実施例では冷媒として機関の潤滑油と同種の
油を用いている。 The present invention will be explained below with reference to illustrated embodiments. 1 in the figure indicates the main body of the engine. The main body 1 consists of a crank chamber 2, a cylinder 3 and a cylinder head 4. 5 is an intake pipe connected to the cylinder head 4, and 6 is an exhaust pipe. A refrigerant tank 7 is disposed on the exhaust valve side of one side of the cylinder head 4, and a trochoid-type pump 8 is disposed on the intake valve side. A refrigerant passage 11a,
11b. 8a is a suction passage of the pump 8, and 8b is a discharge passage. In addition,
In this embodiment, the same type of oil as the lubricating oil of the engine is used as the refrigerant.
シリンダヘツド4は第3図に示すように、下面
に燃焼室12が壁部材14によつて形成されてい
る。15および16はそれぞれ燃焼室12に通じ
る吸気通路および排気通路であり、吸気弁17と
排気弁18とにより開閉される。吸気弁17と排
気弁18とは第4図、第5図に示すように同時に
作動する2個からなつていて、タペツト19を介
して吸気カム軸21、排気カム軸22により開閉
される。13は弁ばねである。吸気カム軸21と
排気カム軸22にはそれぞれ同一歯数のカムギヤ
23が固設され、中間ギヤ24を介して互に連結
されている。この実施例では中間ギヤ24にはス
プロケツト25が一体に設けられ、タイミングチ
エーン26を介してクランク軸で駆動される。排
気カム軸22の軸端にはポンプ8の主軸8cが係
合し、一体的に回転するようになつている。27
は中間ギヤ24を回動自在に支持する枢軸であ
る。 As shown in FIG. 3, the cylinder head 4 has a combustion chamber 12 formed on its lower surface by a wall member 14. Reference numerals 15 and 16 denote an intake passage and an exhaust passage, respectively, which communicate with the combustion chamber 12, and are opened and closed by an intake valve 17 and an exhaust valve 18. The intake valve 17 and the exhaust valve 18 are two valves that operate simultaneously as shown in FIGS. 4 and 5, and are opened and closed by an intake camshaft 21 and an exhaust camshaft 22 via a tappet 19. 13 is a valve spring. Cam gears 23 having the same number of teeth are fixed to each of the intake camshaft 21 and the exhaust camshaft 22, and are connected to each other via an intermediate gear 24. In this embodiment, a sprocket 25 is integrally provided with the intermediate gear 24 and is driven by a crankshaft via a timing chain 26. The main shaft 8c of the pump 8 is engaged with the shaft end of the exhaust camshaft 22, and rotates integrally with the main shaft 8c of the pump 8. 27
is a pivot shaft that rotatably supports the intermediate gear 24.
壁部材14の上面には区画壁28と周壁29と
によつてジヤケツト31が形成されている。ジヤ
ケツト31は第6図で示すように排気弁側の流入
口と吸気弁側の流出口との間に案内壁34を設け
ることによつて排気弁付近から吸気弁付近に至る
冷媒の流路が形成されており、壁部材が均一に冷
却されるよう配慮してある。35は点火栓36の
外周を囲繞する筒壁である。ジヤケツト31の流
入口は第3図および第7図で示すように、縦孔3
7を通して排気通路16の下側へ通じ、流入路3
8によつて排気通路16の側方に開口している。
ジヤケツト31の流出口も同様に縦孔39によつ
て下方へ伸び、流出路40を通して前記冷媒タン
ク7内に通じている。冷媒タンク7はシリンダヘ
ツド4の側方に設けたカバー41によつて外面が
形成され、カバー41内では上部がシリンダヘツ
ド4内の前記区画壁28の上面に伸びその上面は
ヘツドカバー42によつて形成されている。43
はヘツドカバー42に形成した冷媒の注入口、4
4はそのねじ蓋である。 A jacket 31 is formed on the upper surface of the wall member 14 by a partition wall 28 and a peripheral wall 29. As shown in FIG. 6, the jacket 31 has a guide wall 34 between the inlet on the exhaust valve side and the outlet on the intake valve side, so that the flow path of the refrigerant from the vicinity of the exhaust valve to the vicinity of the intake valve is established. It is designed to ensure that the wall member is cooled uniformly. 35 is a cylindrical wall surrounding the outer periphery of the spark plug 36. The inlet of the jacket 31 is connected to the vertical hole 3 as shown in FIGS. 3 and 7.
7 to the lower side of the exhaust passage 16, and the inflow passage 3
8 opens to the side of the exhaust passage 16.
The outlet of the jacket 31 likewise extends downwardly by a vertical hole 39 and communicates with the refrigerant tank 7 through an outlet passage 40 . The outer surface of the refrigerant tank 7 is formed by a cover 41 provided on the side of the cylinder head 4, and within the cover 41, the upper part extends to the upper surface of the partition wall 28 in the cylinder head 4. It is formed. 43
4 is a refrigerant inlet formed in the head cover 42;
4 is its screw cap.
以上のように構成された冷却装置は機関が運転
されると、次のように動作する。排気カム軸22
に駆動されてポンプ8が動作すると、ポンプ8は
吸入通路8aによつて冷媒タンク7から冷媒を吸
入し、吐出通路8bから冷媒通路11aを経てラ
ジエータ9に給送する。車両が走行すると走行風
がラジエータ9に作用し冷媒を冷却する。冷却し
た冷媒は通路11bを経て流入路38から排気通
路16下面へ流入し、そこを冷却しつゝ縦孔37
を上昇し、タペツト19の下方を通過してジヤケ
ツト31内へ流入する。第6図で示すように冷媒
は温度が低い状態において排気弁18と案内壁3
4に案内されて排気弁18および点火栓36付近
を冷却しながら図中で一旦上方へ流れ、そこで転
向して吸気弁17と案内壁34との間を吸気弁1
7付近を冷却しながら下方へ流れて縦孔39に至
る。この間、壁部材14はむらなく均一に冷却さ
れる。壁部材14を冷却して熱せられた冷媒は縦
孔39内を下降して流出路40から冷媒タンク7
内へ還流する。なお、ジヤケツト31を形成する
周壁29の外面に放熱フイン45を形成すると、
冷媒はラジエータ9において冷却される他、放熱
フイン45に作用する走行風によつて直接に冷却
される。 The cooling device configured as described above operates as follows when the engine is operated. Exhaust camshaft 22
When the pump 8 is driven to operate, the pump 8 sucks refrigerant from the refrigerant tank 7 through the suction passage 8a, and supplies it to the radiator 9 through the refrigerant passage 11a from the discharge passage 8b. When the vehicle is running, the running wind acts on the radiator 9 and cools the refrigerant. The cooled refrigerant flows into the lower surface of the exhaust passage 16 from the inlet passage 38 through the passage 11b, and cools it while passing through the vertical hole 37.
rises, passes under the tappet 19 and flows into the jacket 31. As shown in FIG. 6, the refrigerant passes through the exhaust valve 18 and the guide wall 3 when the temperature is low
4 and flows upward in the figure while cooling the vicinity of the exhaust valve 18 and the ignition plug 36, where it turns and flows between the intake valve 17 and the guide wall 34.
It flows downward while cooling the vicinity of 7 and reaches the vertical hole 39. During this time, the wall member 14 is evenly and uniformly cooled. The refrigerant heated by cooling the wall member 14 descends in the vertical hole 39 and flows from the outlet passage 40 to the refrigerant tank 7.
Reflux into the inside. Note that if the heat dissipation fins 45 are formed on the outer surface of the peripheral wall 29 forming the jacket 31,
The refrigerant is not only cooled in the radiator 9 but also directly cooled by the traveling wind acting on the heat radiation fins 45 .
この発明は以上のように、シリンダヘツドに動
弁カム軸に連動するポンプを設け、シリンダヘツ
ド冷却用の冷媒をジヤケツトとラジエータとの間
で循環するものである。機関はシリンダヘツドの
みを液冷するからラジエータが小型で済み設置が
容易である。また、シリンダヘツド一側部の排気
弁側にポンプを配設し吸気弁側に冷媒タンクを配
設すると共に、ジヤケツトとラジエータとを排気
弁側の流入路および吸気弁側の流出路を介して冷
媒通路で連通したから、シリンダヘツド、ポン
プ、冷媒タンクの各部材を互いに近接させること
ができるだけでなく、冷媒を排気弁側から吸気弁
側へ流すことができる。したがつて、冷媒通路を
可及的に短縮することができ、しかも多弁式内燃
機関において最も冷却が困難な燃焼室頂部の壁部
材を冷却する、特に加熱し易い排気弁付近を効果
的に冷却することができる。 As described above, the present invention provides a cylinder head with a pump linked to a valve operating camshaft, and circulates a refrigerant for cooling the cylinder head between the jacket and the radiator. Since the engine liquid-cools only the cylinder head, the radiator is small and easy to install. In addition, a pump is provided on the exhaust valve side of one side of the cylinder head, and a refrigerant tank is provided on the intake valve side, and the jacket and radiator are connected via an inflow path on the exhaust valve side and an outflow path on the intake valve side. Since they are communicated through the refrigerant passage, not only can the cylinder head, pump, and refrigerant tank be brought close to each other, but also the refrigerant can flow from the exhaust valve side to the intake valve side. Therefore, the refrigerant passage can be shortened as much as possible, and the wall member at the top of the combustion chamber, which is the most difficult to cool in a multi-valve internal combustion engine, can be cooled, and in particular, the area around the exhaust valve, which is easily heated, can be effectively cooled. can do.
図面は本発明の一実施例を示すもので、第1図
は冷却装置の概略を示す全体図、第2図は要部の
拡大側面図、第3図は断面図、第4図は第3図中
の−断面図、第5図は−断面図、第6図
は−断面図、第7図は−断面図である。
7……冷媒タンク、8……ポンプ、9……ラジ
エータ、14……壁部材、17……吸気弁、18
……排気弁、21……吸気カム軸、22……排気
カム軸、31……ジヤケツト。
The drawings show one embodiment of the present invention, in which Fig. 1 is an overall view schematically showing the cooling device, Fig. 2 is an enlarged side view of the main parts, Fig. 3 is a cross-sectional view, and Fig. 5 is a sectional view, FIG. 6 is a sectional view, and FIG. 7 is a sectional view. 7... Refrigerant tank, 8... Pump, 9... Radiator, 14... Wall member, 17... Intake valve, 18
...exhaust valve, 21...intake camshaft, 22...exhaust camshaft, 31...jacket.
Claims (1)
との一方を複数個配置した多弁式内燃機関におい
て、シリンダヘツド4に前記各弁を駆動する吸気
カム軸21および排気カム軸22を設け、シリン
ダヘツド一側部の排気弁側に前記排気カム軸22
に連動されたポンプ8を配設し吸気弁側に冷媒タ
ンク7を配設すると共に、燃焼室12を形成する
壁部材14の外周にジヤケツト31を形成し、こ
のジヤケツト31とラジエータ9とをシリンダヘ
ツド4の排気弁側に設けた流入路38および吸気
弁側に設けた流出路40を介して連通する冷媒通
路中に前記ポンプ8および冷媒タンク7を介在さ
せてなる多弁式内燃機関の冷却装置。1 At least an intake valve 5 and an exhaust valve 6 in one cylinder
In a multi-valve internal combustion engine, the cylinder head 4 is provided with an intake camshaft 21 and an exhaust camshaft 22 for driving the respective valves, and the exhaust camshaft is provided on the exhaust valve side of one side of the cylinder head. 22
A pump 8 linked to the combustion chamber 12 is disposed, and a refrigerant tank 7 is disposed on the intake valve side.A jacket 31 is formed on the outer periphery of the wall member 14 forming the combustion chamber 12, and the jacket 31 and the radiator 9 are connected to the cylinder. A cooling system for a multi-valve internal combustion engine in which the pump 8 and the refrigerant tank 7 are interposed in a refrigerant passage that communicates with the head 4 through an inlet passage 38 provided on the exhaust valve side and an outlet passage 40 provided on the intake valve side. .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13664280A JPS5762911A (en) | 1980-09-29 | 1980-09-29 | Cooling device of multi-valve type internal combustion engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13664280A JPS5762911A (en) | 1980-09-29 | 1980-09-29 | Cooling device of multi-valve type internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5762911A JPS5762911A (en) | 1982-04-16 |
JPS6339766B2 true JPS6339766B2 (en) | 1988-08-08 |
Family
ID=15180079
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13664280A Granted JPS5762911A (en) | 1980-09-29 | 1980-09-29 | Cooling device of multi-valve type internal combustion engine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5762911A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0517384Y2 (en) * | 1986-08-05 | 1993-05-11 | ||
JPS6371457U (en) * | 1986-10-29 | 1988-05-13 | ||
JP2782548B2 (en) * | 1990-04-20 | 1998-08-06 | ヤマハ発動機株式会社 | Engine cooling system |
US8074614B2 (en) * | 2008-09-12 | 2011-12-13 | GM Global Technology Operations LLC | Integrated hydraulic cooler and return rail in camless cylinder head |
-
1980
- 1980-09-29 JP JP13664280A patent/JPS5762911A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS5762911A (en) | 1982-04-16 |
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