JPH05179920A - Oil recover in two-cycle engine - Google Patents
Oil recover in two-cycle engineInfo
- Publication number
- JPH05179920A JPH05179920A JP34484391A JP34484391A JPH05179920A JP H05179920 A JPH05179920 A JP H05179920A JP 34484391 A JP34484391 A JP 34484391A JP 34484391 A JP34484391 A JP 34484391A JP H05179920 A JPH05179920 A JP H05179920A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- check valve
- engine
- chamber
- intake system
- 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.)
- Granted
Links
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
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
Landscapes
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、２サイクルエンジンの
クランク室の底部に溜まる潤滑用のオイルを回収する装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for collecting lubricating oil that collects at the bottom of a crank chamber of a two-cycle engine.
【０００２】[0002]
【従来の技術】２サイクルエンジンにおいては、混合気
と共に供給されたオイル、又は給油路を経て潤滑部に供
給されたオイルがクランク室の底部に溜まるので、該オ
イルを回収して吸気系に戻し、再度エンジンに供給する
ことが知られている。例えば実開平２−６１１０８号の
考案においては、クランク室の底部と気化器の絞り弁の
エンジン側弁摺動面との間を、所定の圧力差になったと
きだけ絞り弁方向に開放する逆止弁を介して連通し、溜
まっているオイルを吸気に吸込ませて再利用している。2. Description of the Related Art In a two-cycle engine, the oil supplied together with an air-fuel mixture or the oil supplied to a lubrication section through an oil supply passage accumulates at the bottom of a crank chamber. Therefore, the oil is recovered and returned to an intake system. , Is known to feed the engine again. For example, in the invention of Japanese Utility Model Laid-Open No. 2-61108, the reverse is such that the bottom portion of the crank chamber and the engine-side valve sliding surface of the throttle valve of the carburetor are opened in the throttle valve direction only when a predetermined pressure difference is reached. It communicates through a stop valve, sucks the accumulated oil into the intake air, and reuses it.
【０００３】しかし、この手段を用いると、エンジン停
止中にエンジン内部に付着したオイルがクランク室の底
部に集まって、運転継続時より多量のオイルが溜まり、
この状態でエンジンを始動すれば、始動時及びこれに続
くアイドリング時は絞り弁部とクランク室の圧力差が大
きいため、溜まっていたオイルが混合気と共に直ちにエ
ンジンに再供給される。ところがエンジンは、始動直後
は低温で発生熱量も低いため、オイルが完全に燃焼でき
ず、白煙となって排気と共に排出されるおそれがある。However, when this means is used, the oil that has adhered to the inside of the engine when the engine is stopped collects at the bottom of the crank chamber, and a larger amount of oil accumulates than during continuous operation.
If the engine is started in this state, the difference in pressure between the throttle valve portion and the crank chamber is large at the time of starting and idling thereafter, so that the accumulated oil is immediately re-supplied to the engine together with the air-fuel mixture. However, since the engine is low in temperature immediately after starting and the amount of heat generated is low, the oil may not be completely combusted, and white smoke may be emitted together with the exhaust gas.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、簡単な手段
で前記の不都合が生じるのを防止することを課題とす
る。SUMMARY OF THE INVENTION An object of the present invention is to prevent the above-mentioned inconvenience from occurring by a simple means.
【０００５】[0005]
【課題を解決するための手段】本発明における前記課題
を解決するための第１の手段は、請求項１に記載したと
おり、クランク室底部より吸気系に連らなる連通路の途
中に、吸気系側に開く逆止弁を備える２サイクルエンジ
ンのオイル回収装置において、前記連通路の下流側を気
化器の絞り弁の上流側に連通したことを特徴とする。The first means for solving the above-mentioned problems in the present invention is, as described in claim 1, the intake air in the middle of the communication passage extending from the bottom of the crank chamber to the intake system. In a two-cycle engine oil recovery device having a check valve that opens on the system side, the downstream side of the communication passage is connected to the upstream side of the throttle valve of the carburetor.
【０００６】また第２の手段は、請求項２に記載したと
おり、クランク室底部より吸気系に連らなる連通路の途
中に小容積の回収室を配置し、該回収室の下流側に吸気
系側に開く逆止弁を備える２サイクルエンジンのオイル
回収装置において、回収室の下流に上昇管を連設し、該
上昇管における回収室の通常走行時の液面よりも高い位
置に逆止弁を設けたことを特徴とする。In the second means, as described in claim 2, a small-capacity recovery chamber is disposed in the middle of the communication passage extending from the bottom of the crank chamber to the intake system, and the intake chamber is provided downstream of the recovery chamber. In a two-cycle engine oil recovery device equipped with a check valve that opens to the system side, a riser pipe is connected downstream of the recovery chamber, and a check valve is provided at a position higher than the liquid level of the recovery chamber during normal traveling in the riser pipe. It is characterized by having a valve.
【０００７】[0007]
【作用】前記第１の手段によれば、エンジンの始動時及
び不整燃焼時は、吸気系の負圧が小さいので、連通路の
差圧が小さく、オイルが逆止弁を超えることができず、
オイルの再供給は行なわれない。そして、エンジン速度
が上昇すると吸気の流速が上昇するため、吸気系の静圧
が低下し、オイルは逆止弁を超えて吸気系に流入し再供
給が行なわれるが、エンジンの発生熱量が大きいためオ
イルは完全燃焼して白煙は生じない。According to the first means, since the negative pressure of the intake system is small at the time of starting the engine and at the time of irregular combustion, the differential pressure in the communication passage is small, and the oil cannot exceed the check valve. ,
No oil resupply is done. Then, as the engine speed increases, the flow velocity of intake air increases, so the static pressure of the intake system decreases, and oil flows past the check valve into the intake system to be resupplied, but the amount of heat generated by the engine is large. Therefore, the oil burns completely and white smoke does not occur.
【０００８】また前記第２の手段によれば、オイルが逆
止弁を通過する圧力差は、立上り管の高さによって規定
され、所望の圧力差で再供給される。Further, according to the second means, the pressure difference at which the oil passes through the check valve is defined by the height of the rising pipe, and is re-supplied at a desired pressure difference.
【０００９】[0009]
【実施例】以下、本発明の実施例を図面に従って説明す
る。図１で１は２サイクルエンジン、２はクランク室、
３はシリンダ、４は吸気管側の掃気口、５は排気口であ
る。Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a 2-cycle engine, 2 is a crank chamber,
3 is a cylinder, 4 is a scavenging port on the intake pipe side, and 5 is an exhaust port.
【００１０】掃気口４の近くにはクランク室２に臨むリ
ード弁６が設けられ、その上流に吸気管７と気化器８が
連設され、気化器８の中心には絞り弁９が上下方向に摺
動自在に設けられてケーブル１０で操作される。A reed valve 6 facing the crank chamber 2 is provided near the scavenging port 4, an intake pipe 7 and a carburetor 8 are connected upstream of the reed valve 6, and a throttle valve 9 is vertically provided at the center of the carburetor 8. It is slidably mounted on and is operated by the cable 10.
【００１１】クランク室２には概念的に図示するクラン
ク軸１１が支承され、そのクランクピン１１ａにコンロ
ッド１２及びピストン１３が順に接続され、略半円形の
クランクウエブ１２ｂとクランク室２の内周面との間に
は間隙１４が形成されている。A crankshaft 11, which is conceptually illustrated, is supported in the crank chamber 2, a connecting rod 12 and a piston 13 are sequentially connected to a crank pin 11a thereof, and a substantially semicircular crank web 12b and an inner peripheral surface of the crank chamber 2 are provided. A gap 14 is formed between
【００１２】そして、クランク軸１１の回転は、図外の
一次減速ギヤ及び主クラッチを介して変速機１５に伝達
されて負荷を駆動する。The rotation of the crankshaft 11 is transmitted to the transmission 15 via a primary reduction gear and a main clutch (not shown) to drive a load.
【００１３】クランク室２の底部１６は、オイルを捕集
し易いように前記間隙１４が少し拡げられており、また
回転方向下流側にはクランクウエブ１２ｂの外周面に極
めて近接するスクレパ１７が突設され、クランクウエブ
１２ｂの外周に付着したオイルを掻き落して底部１６に
流すようになっている。At the bottom portion 16 of the crank chamber 2, the gap 14 is slightly widened so that oil can be easily collected, and a scraper 17 which is extremely close to the outer peripheral surface of the crank web 12b projects on the downstream side in the rotation direction. The oil adhered to the outer periphery of the crank web 12b is scraped off and flowed to the bottom portion 16.
【００１４】底部１６に捕集されたオイルを吸気系に戻
すために、回収装置２０が用いられ、該回収装置２０
は、本体２１、蓋体２２及び隔板２３を備え、本体２１
には回収室２４が設けられる。該回収室２４は、エンジ
ンを長持間放置したとき溜まるオイル量より若干大きい
容積をもち、流入管２５で前記底部１６に連通される。
回収室２４の下部側面には出口路２６が設けられ、本体
２１と蓋体２２に隔板２３を挾んで立上がる上昇路２７
と容積の大きい下降路２８が形成され、隔板２３に両路
２７、２８の上部を連通する逆止弁２９が設けられる。
該逆止弁２９は、回収室２４内の通常走行時のオイルＯ
の油面Ｌよりｈだけ上方に配置され、図２に示すように
小孔２９ａ、弁板２９ｂ、舌片状の４枚のストッパ２９
ｃを備え、弁板２９ｂを加圧するためのスプリングは設
けない。そして、下降路２８の下端から気化器８の絞り
弁９の上流側に開口する連通路３０が設けられる。A recovery device 20 is used to return the oil collected in the bottom portion 16 to the intake system.
Includes a main body 21, a lid body 22 and a partition plate 23.
A recovery chamber 24 is provided in the. The recovery chamber 24 has a volume slightly larger than the amount of oil accumulated when the engine is left standing for a long time, and is connected to the bottom portion 16 by an inflow pipe 25.
An outlet path 26 is provided on the lower side surface of the recovery chamber 24, and an ascending path 27 that rises by sandwiching the partition plate 23 between the main body 21 and the lid 22.
A descending path 28 having a large volume is formed, and a check valve 29 that connects the upper parts of the paths 27 and 28 to the partition plate 23 is provided.
The check valve 29 is used for the oil O during normal traveling in the recovery chamber 24.
2 is arranged above the oil surface L of the above, and as shown in FIG. 2, a small hole 29a, a valve plate 29b, and four tongue-shaped stoppers 29.
c, and no spring is provided to pressurize the valve plate 29b. A communication passage 30 that opens from the lower end of the descending passage 28 to the upstream side of the throttle valve 9 of the carburetor 8 is provided.
【００１５】このエンジン１は、上部から後方にかけて
ハンガーボス３１、３２、３３を有し、図３の自動二輪
車Ｍに搭載される。各ハンガーボスは、該自動二輪車Ｍ
の主フレーム３５に固定具３６、３７、３８によって固
定され、出力スプロケット３９の回転をチェーン４０を
介して後輪４２のスプロケット４２ａに伝える。そし
て、シート４３の下方に設けたエヤクリーナ４４から吸
気管４５を経て気化器８に空気が供給され、図外の燃料
タンクとオイルタンク４６から該気化器８に燃料とオイ
ルが供給される。そして、回収装置２０は、前記のとお
りエンジン１の下部に設けられ、連通路３０で気化器８
の吸気管４５側に連通される。The engine 1 has hanger bosses 31, 32, 33 extending from the upper part to the rear and is mounted on the motorcycle M of FIG. Each hanger boss is the motorcycle M
The main frame 35 is fixed to the main frame 35 by fixing members 36, 37, 38, and the rotation of the output sprocket 39 is transmitted to the sprocket 42a of the rear wheel 42 via the chain 40. Air is supplied to the carburetor 8 from the air cleaner 44 provided below the seat 43 through the intake pipe 45, and fuel and oil are supplied to the carburetor 8 from the fuel tank and the oil tank 46 (not shown). Then, the recovery device 20 is provided in the lower portion of the engine 1 as described above, and the recovery device 20 is provided in the communication passage 30.
To the intake pipe 45 side.
【００１６】図１において、ピストン１３の下降により
クランク室２から回収室２４に作用する圧力をＰ1、吸
気系から下降室２８に作用する圧力をＰ2とし、Ｐ1−Ｐ
2＝△Ｐの圧力差で高さｈの油柱が形成されるとする
に、圧力差が△Ｐ以下のときは、回収室２４内の油量が
多くてもオイルは逆止弁２９を越えることができない。In FIG. 1, the pressure acting from the crank chamber 2 to the recovery chamber 24 by the lowering of the piston 13 is P 1 , and the pressure acting from the intake system to the descending chamber 28 is P 2 , where P 1 -P
2 = ΔP pressure difference forms an oil column of height h. However, when the pressure difference is less than ΔP, the check valve 29 is used even if the amount of oil in the recovery chamber 24 is large. I can't cross it.
【００１７】したがって気化器８を通る空気の流速が低
い始動時、アイドリング時又は不整燃焼時には、オイル
が連通路３０から気化器８に流れることは防止される。
また、ピストン１３の上昇によりクランク室２内が減圧
されるときは、逆止弁２９の閉鎖によりオイルの逆流は
防止される。しかし、絞り弁９の開放により気化器８を
通る空気の流速が増大して静圧が減少し、圧力差△Ｐが
増大して該圧力差△Ｐによる油柱がｈ以上になろうとす
ると、オイルは、逆止弁２９を通って下降室２８内に落
ち、かつ回収室２４の油面Ｌが低下すると、混合気が流
出して落ちたオイルを吹き上げて吸気系に再供給する。Therefore, oil is prevented from flowing from the communication passage 30 to the carburetor 8 at the time of start-up when the flow velocity of the air passing through the carburetor 8 is low, idling, or irregular combustion.
Further, when the inside of the crank chamber 2 is depressurized by the rise of the piston 13, the check valve 29 is closed to prevent the reverse flow of oil. However, when the throttle valve 9 is opened, the flow velocity of the air passing through the carburetor 8 is increased, the static pressure is reduced, the pressure difference ΔP is increased, and the oil column due to the pressure difference ΔP is about h or more. The oil passes through the check valve 29 into the descending chamber 28, and when the oil level L in the recovery chamber 24 decreases, the air-fuel mixture flows out and the dropped oil is blown up to be supplied again to the intake system.
【００１８】図４は差圧△Ｐと回収油量Ｑの関係を示
し、前記高さｈの油柱が生じる差圧を△Ｐ0とすると、
線ｌを境として△Ｐ＜△Ｐ0の領域ではオイルは回収室
２４に溜り、△Ｐ＞△Ｐ0の領域では回収油の再供給が
行なわれる。そして落差ｈをもつ差圧△Ｐ0で再供給が
行なわれるものにおいては、差圧の増大により線ｑ0の
ように再供給量が変化し、ｈ＞ｈ1で差圧△Ｐ1で流出す
るものは線ｑ1に示すように流量Ｑが変化し、ｈ＜ｈ2で
△Ｐ2で流出するものは線ｑ2のように変化する。FIG. 4 shows the relationship between the differential pressure ΔP and the recovered oil amount Q, where ΔP 0 is the differential pressure generated by the oil column having the height h.
The oil is accumulated in the recovery chamber 24 in the region of ΔP <ΔP 0 with the line 1 as a boundary, and the recovered oil is re-supplied in the region of ΔP> ΔP 0 . Then, in the case where the re-supply is performed at the differential pressure ΔP 0 having the drop h, the re-supply amount changes as shown by the line q 0 due to the increase in the differential pressure, and when h> h 1 the outflow occurs at the differential pressure ΔP 1 . ones the flow rate Q changes as shown in line q 1, h <those flowing in h 2 at △ P 2 changes as the line q 2.
【００１９】図５は、エンジンの出力と回収油再供給ゾ
ーンの関係を示し、Ｌ1は△Ｐ＝Ｐ2−Ｐ1＝ｈの差圧が
小さい領域の上限を示し、Ｌ2は全開出力で、このとき
△Ｐ＝Ｐ2−Ｐ1＞ｈの関係を有する。またＬ3は走行抵
抗を示す。図において線Ｌ1とＬ2に囲まれた領域Ａが回
収オイルの再供給域となり、Ｌ1とＬ2の高さの差が再供
給量に略比例する。図から明らかなようにエンジン回転
及び出力が低いとき再供給量は少なく、高回転、高出力
になると再供給量は増大する。FIG. 5 shows the relationship between the output of the engine and the recovered oil resupply zone, L 1 is the upper limit of the region where the differential pressure of ΔP = P 2 -P 1 = h is small, and L 2 is the fully open output. Then, at this time, there is a relation of ΔP = P 2 −P 1 > h. L 3 represents running resistance. In the figure, the area A surrounded by the lines L 1 and L 2 is the re-supply area for the recovered oil, and the height difference between L 1 and L 2 is approximately proportional to the re-supply amount. As is apparent from the figure, the re-supply amount is small when the engine speed and the output are low, and the re-supply amount increases when the engine speed and the output are high.
【００２０】[0020]
【発明の効果】以上のとおり、本発明の第１の手段によ
れば、クランク室と吸気系の差圧が、エンジンの低出力
時は小で、高出力時は大であることを利用し、該差圧に
応じてクランク室に溜るオイルを再供給するので、エン
ジン温度及び発熱量の低い低出力時に再供給量を少なく
したので、オイルの不完全燃焼量を少なくできる効果を
奏する。As described above, according to the first means of the present invention, it is utilized that the differential pressure between the crank chamber and the intake system is small at low engine output and large at high engine output. Since the oil accumulated in the crank chamber is re-supplied in accordance with the differential pressure, the re-supplied amount is reduced when the engine temperature and the calorific value are low and thus the incomplete combustion amount of the oil can be reduced.
【００２１】また第２の手段によれば、回収室に続く上
昇路の高さにより、再供給開始時の差圧を決めることが
できるから、所望の出力を発生するとき再供給を開始で
き、これによりオイルの不完全燃焼を防止できる効果を
奏する。According to the second means, the differential pressure at the start of re-supply can be determined by the height of the ascending path continuing to the recovery chamber, so that re-supply can be started when a desired output is generated, This has the effect of preventing incomplete combustion of oil.
【図１】 本発明を実施したエンジンの縦断面図FIG. 1 is a longitudinal sectional view of an engine embodying the present invention.
【図２】 逆止弁の縦断面図FIG. 2 is a vertical sectional view of a check valve.
【図３】 本発明のエンジンを搭載した自動二輪車の側
面図FIG. 3 is a side view of a motorcycle equipped with the engine of the present invention.
【図４】 オイル回収量説明図[Figure 4] Oil recovery amount explanatory diagram
【図５】 オイル回収域説明図[Fig. 5] Illustration of oil recovery area
２ クランク室 ８ 気化器 ２０ 回収装置 ２４ 回収室 ２７ 上昇路 ２８ 下降路 ２９ 逆止弁 ３０ 連通路 2 Crank chamber 8 Vaporizer 20 Recovery device 24 Recovery chamber 27 Upward path 28 Downward path 29 Check valve 30 Communication path
Claims (2)
通路の途中に、吸気系側に開く逆止弁を備える２サイク
ルエンジンのオイル回収装置において、前記連通路の下
流側を気化器の絞り弁の上流側に連通したことを特徴と
する、２サイクルエンジンのオイル回収装置。1. An oil recovery device for a two-cycle engine, comprising a check valve opening to the intake system in the middle of a communication passage extending from the bottom of a crank chamber to the intake system, wherein the downstream side of the communication passage is a carburetor. An oil recovery device for a two-cycle engine, which is connected to the upstream side of the throttle valve.
通路の途中に小容積の回収室を配置し、該回収室の下流
側に吸気系側に開く逆止弁を備える２サイクルエンジン
のオイル回収装置において、回収室の下流に上昇管を連
設し、該上昇管における回収室の通常走行時の液面より
も高い位置に逆止弁を設けたことを特徴とする、２サイ
クルエンジンのオイル回収装置。2. A two-cycle engine having a small-capacity recovery chamber arranged in the middle of a communication passage extending from the bottom of the crank chamber to the intake system, and provided with a check valve opening to the intake system downstream of the recovery chamber. In the oil recovery device, a two-cycle engine characterized in that a riser pipe is connected downstream of the recovery chamber, and a check valve is provided at a position higher than the liquid level of the riser pipe during normal traveling of the recovery chamber. Oil recovery device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3344843A JP3052099B2 (en) | 1991-12-26 | 1991-12-26 | Oil recovery device for two-stroke engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3344843A JP3052099B2 (en) | 1991-12-26 | 1991-12-26 | Oil recovery device for two-stroke engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05179920A true JPH05179920A (en) | 1993-07-20 |
| JP3052099B2 JP3052099B2 (en) | 2000-06-12 |
Family
ID=18372411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3344843A Expired - Fee Related JP3052099B2 (en) | 1991-12-26 | 1991-12-26 | Oil recovery device for two-stroke engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3052099B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100768376B1 (en) * | 2005-08-30 | 2007-10-18 | 혼다 기켄 고교 가부시키가이샤 | Internal-combustion engine |
-
1991
- 1991-12-26 JP JP3344843A patent/JP3052099B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100768376B1 (en) * | 2005-08-30 | 2007-10-18 | 혼다 기켄 고교 가부시키가이샤 | Internal-combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3052099B2 (en) | 2000-06-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |