JPS61145307A - Starter device for two-cycle engine - Google Patents
Starter device for two-cycle engineInfo
- Publication number
- JPS61145307A JPS61145307A JP26646284A JP26646284A JPS61145307A JP S61145307 A JPS61145307 A JP S61145307A JP 26646284 A JP26646284 A JP 26646284A JP 26646284 A JP26646284 A JP 26646284A JP S61145307 A JPS61145307 A JP S61145307A
- Authority
- JP
- Japan
- Prior art keywords
- engine
- combustion chamber
- compression
- air
- 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.)
- Pending
Links
- 239000007858 starting material Substances 0.000 title description 2
- 238000002485 combustion reaction Methods 0.000 claims abstract description 10
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 abstract description 26
- 238000007906 compression Methods 0.000 abstract description 26
- 239000000203 mixture Substances 0.000 abstract description 10
- 239000000446 fuel Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 230000002000 scavenging effect Effects 0.000 description 3
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 2
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/36—Valve-gear or valve arrangements, e.g. lift-valve gear peculiar to machines or engines of specific type other than four-stroke cycle
- F01L1/38—Valve-gear or valve arrangements, e.g. lift-valve gear peculiar to machines or engines of specific type other than four-stroke cycle for engines with other than four-stroke cycle, e.g. with two-stroke cycle
-
- 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
-
- 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
- F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/004—Aiding engine start by using decompression means or variable valve actuation
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は２サイクル機関の始動装置に関し、詳しくは、
火花点火式または圧縮着火式等の２サイクル機関の始動
時に高い圧縮温度と圧力が得られ、その始動を容易にす
る２サイクル機関の始動装置に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a starting device for a two-stroke engine, and in detail,
The present invention relates to a starting device for a two-stroke engine, such as a spark ignition type or a compression ignition type engine, which can obtain high compression temperature and pressure when starting the engine, and facilitates the starting of the engine.
第５図に示すごとく、ピストン７を往復動させる燃焼室
１内に点火プラグ２を有し、かつ矢印空気Ａと燃料Ｆの
混合気を吸気ポート３に導入する気化器４を有し、クラ
ンク室５に連通する掃気ポート６及び排気Ｅを排出する
排気ポート８からなる火花点火式２サイクル機関におい
て、低オクタン価燃料を使用する場合、通常負荷運転時
においてはその圧縮比を高くずとノッキングが起るため
、圧縮比を低（押さえなければならない。または、気化
器を持たず燃料噴射を有するディーゼル機関等では構造
的にまた通常負荷運転時の筒内最高圧力を過度に上げ過
ぎないようにするために圧縮比を低くおさえなければな
らない。As shown in FIG. 5, it has a spark plug 2 in a combustion chamber 1 in which a piston 7 reciprocates, and a carburetor 4 that introduces a mixture of air A and fuel F into an intake port 3, and a crankshaft. In a spark-ignition two-stroke engine consisting of a scavenging port 6 that communicates with the chamber 5 and an exhaust port 8 that discharges the exhaust gas E, when using low octane fuel, knocking should be avoided unless the compression ratio is set high during normal load operation. To avoid this, the compression ratio must be kept low.Alternatively, in diesel engines that do not have a carburetor and have fuel injection, structural measures must be taken to avoid excessively increasing the maximum pressure in the cylinder during normal load operation. To achieve this, the compression ratio must be kept low.
しかしながら、上記従来の２サイクル機関の低温始動時
には圧縮比が低いために着火性が悪く、始動が困難であ
り、これを改善するため吸気を加熱する方式も使用され
ているが、圧縮開始時期までは大部分の熱を奪われるた
め、大容量のヒータを設けない限り効果が少ないという
問題があった。However, when starting the conventional two-stroke engine at low temperature, the compression ratio is low, so ignitability is poor and starting is difficult.To improve this, methods are used to heat the intake air, but until the compression starts, Since most of the heat is taken away, there is a problem that the effect is low unless a large-capacity heater is installed.
そこで、本発明は前記従来の問題点を解消するため、機
関始動時にのみクランク軸の２回転に１回の爆発をさせ
る４サイクル機関として圧縮行程で加圧され、高温とな
った混合気を一旦空気室にた（ねえ、次の圧縮行程開始
時期に放出させることにより圧縮初期温度を上昇させ、
圧縮温度と圧力を高くして着火性を向上させうる始動装
置を提供することを目的としたものである。Therefore, in order to solve the above-mentioned conventional problems, the present invention is a 4-cycle engine that explodes once every two revolutions of the crankshaft only when the engine is started. By releasing the air into the air chamber at the start of the next compression stroke, the initial compression temperature is increased.
The object of the present invention is to provide a starter device that can improve ignitability by increasing compression temperature and pressure.
即ち、本発明の始動装置は、２サイクル機関の燃焼室に
開閉弁を介して連通ずる空気室を設けると共に、該開閉
弁を該２サイクル機関の始動時においてのみ駆動可能で
、かつクランク軸の回転数の半分の回転数に同期したカ
ム軸からなる動弁装置を設けることにより構成される。That is, the starting device of the present invention includes an air chamber that communicates with the combustion chamber of a two-stroke engine via an on-off valve, and the on-off valve can be driven only when the two-stroke engine is started. It is constructed by providing a valve train consisting of a camshaft synchronized at half the rotational speed.
以下図面を参照して本発明の詳細な説明するが、第１図
は本発明の一実施例における２サイクル機関の始動装置
を示す概略縦断面図であり、この２サイクル機関は第５
図の従来例とほぼ同様の構成及び機能を有する火花点火
式のもので、第５図と同じ部品は同じ部品番号で示して
いる。The present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic longitudinal cross-sectional view showing a starting device for a two-cycle engine according to an embodiment of the present invention, and this two-cycle engine is equipped with a fifth engine.
This is a spark ignition type having almost the same structure and function as the conventional example shown in the figure, and the same parts as in FIG. 5 are indicated by the same part numbers.
そこで２本発明ではピストン７を内臓した燃焼室１の上
部のシリンダヘッド部分に開閉弁９を介して連通ずる空
気室であるサブチャンバ１０を設けており、この開閉弁
９は弁ばね１１により通常は閉鎖された状態としている
。Therefore, in the present invention, a subchamber 10, which is an air chamber, is provided in the upper cylinder head portion of the combustion chamber 1 containing the piston 7 through an on-off valve 9, and this on-off valve 9 is normally operated by a valve spring 11. is in a closed state.
また、このクランク室５内のクランク軸１２に連動し、
かつクランク軸１２の回転数の半分の回転数に同期した
カム軸１３を設け、このカム軸１３により駆動されるタ
ペット１４、ロッド１５及び弁腕１６を介して上記開閉
弁９の開閉を行う動弁装置を構成している。Also, in conjunction with the crankshaft 12 in this crank chamber 5,
A camshaft 13 synchronized with half the rotation speed of the crankshaft 12 is provided, and the on-off valve 9 is opened and closed through a tappet 14, a rod 15, and a valve arm 16 driven by the camshaft 13. It constitutes a valve device.
なお、第２図の拡大図において、１７で示すのはタペッ
トばねであり、機関の通常運転時には、カム軸１３のカ
ム１３Ａとタペット１４とは接触せず、また、弁腕１６
は偏心弁腕軸１６Ａで支持され、手動により機関始動時
にレバー操作を行なうようにしており、これにより上記
の動弁装置は機関始動時にのみ駆動されるようになって
いる。In the enlarged view of FIG. 2, 17 is a tappet spring, and during normal operation of the engine, the cam 13A of the camshaft 13 and the tappet 14 do not come into contact with each other, and the valve arm 16
is supported by an eccentric valve arm shaft 16A, and the lever is operated manually when the engine is started, so that the above-mentioned valve operating device is driven only when the engine is started.
なお、第２図に示すように、サブチャンバ１０内、また
はその周囲にヒータ１８を設けて圧縮温度の上昇をはか
ることもできる。Note that, as shown in FIG. 2, a heater 18 may be provided in or around the subchamber 10 to increase the compression temperature.
次に、上記の構成からなる本発明の２サイクル機関の始
動装置の作動原理を第３−Ａ図から第３−Ｆ図までに従
って説明するは、まず、第３−Ａ図はＲ方向に回転する
クランク軸１２の回転に連動して往復動するピストン７
を内蔵した燃焼室１の爆発・膨張行程を示し、第３−Ｂ
図の第１掃気行程では矢印Ｓからの混合気により矢印Ｅ
の排気を排気ポート８から掃気する。Next, the operating principle of the starting device for a two-stroke engine of the present invention having the above configuration will be explained according to FIGS. 3-A to 3-F. First, FIG. 3-A shows rotation in the R direction. A piston 7 that reciprocates in conjunction with the rotation of the crankshaft 12.
3-B shows the explosion and expansion stroke of the combustion chamber 1 with a built-in
In the first scavenging stroke in the figure, the air-fuel mixture from arrow S causes arrow E to
The exhaust gas is scavenged from the exhaust port 8.
次に、第３−Ｃ図の第１圧縮行程においては、開閉弁９
が開いて、サブチャンバ１０内に第３−Ｂ図における掃
気用の混合気Ｓが充気し、第３−り同第２掃気行程で更
に次の混合気Ｓ′が燃焼室１内に充満した後、第３−Ｅ
図の圧縮始めの充気行程でサブチャンバ１０の開閉弁９
が再び開いて、サブチャンバ１０内に充気されていた高
温高圧の混合気Ｓと接触し、第３−Ｆ図の第２圧縮行程
の後、第３−Ａ図の爆発・膨張工程に入り、上記の作動
を繰り返すことになるが、第３−Ｆ図にてＳ“で示すの
は、吸気ボート３から導入される次の混合気である。Next, in the first compression stroke in Fig. 3-C, the on-off valve 9
opens, the subchamber 10 is filled with the scavenging air mixture S shown in FIG. After that, 3rd-E
The on-off valve 9 of the subchamber 10 during the charging stroke at the beginning of compression shown in the figure.
opens again and comes into contact with the high-temperature, high-pressure mixture S that was filled in the subchamber 10, and after the second compression stroke shown in Figure 3-F, enters the explosion/expansion stage shown in Figure 3-A. , the above operation is repeated, but what is shown by S" in FIG. 3-F is the next air-fuel mixture introduced from the intake boat 3.
そこで、本発明の始動装置におけるサブチャンバ１０の
開閉弁９の動弁装置における開弁タイミングを第４図の
線図において示しているが、上の線図は燃焼室１のシリ
ンダの内圧とピストン７の下死点ＢＤＣ及び上死点ＴＤ
Ｃとの関係を示し、下の線図はカムリフトによるサブチ
ャンバ１０への混合気Ｓの充気Ａ及びサブチャンバに充
気された混合気Ｓのシリンダ内への放出Ｂをそれぞれ示
している６
〔発明の効果〕
従って、本発明の始動装置は、機関始動時にのみクラン
ク軸の２回転に１回の爆発をさせる４サイクル機関とし
て圧縮行程で加圧され高温となった混合気を一旦空気室
にだ（わえ、次の圧縮行程開始時期に放出させることに
より、圧縮初期温度を上昇させ、圧縮温度と圧力を高く
して、着火性を向上させうるという効果がある。Therefore, the valve opening timing in the valve operating system of the on-off valve 9 of the subchamber 10 in the starting device of the present invention is shown in the diagram of FIG. 7 bottom dead center BDC and top dead center TD
The diagram below shows the filling A of the mixture S into the subchamber 10 by the cam lift and the discharge B of the mixture S filled in the subchamber into the cylinder 6 [Effects of the Invention] Therefore, the starting device of the present invention operates as a 4-cycle engine that causes one explosion every two revolutions of the crankshaft only when starting the engine, and once the mixture that has become pressurized and heated during the compression stroke is transferred to the air chamber. Moreover, by releasing it at the start of the next compression stroke, it has the effect of increasing the initial compression temperature, increasing the compression temperature and pressure, and improving ignitability.
また、本発明は特に火花点火式機関でオクタン価の低い
燃料を用いるときに圧縮比を高くできない場合や、圧縮
着火機関においても、その冷態始動性の向上をはかるこ
とができるが、その通常運転時には従来の２サイクル機
関と全く等しい運転が可能であるのはいうまでもない。Furthermore, the present invention can improve the cold startability of spark ignition engines, especially when the compression ratio cannot be increased when using fuel with a low octane number, and compression ignition engines, but it is also possible to improve the cold startability of the engine during normal operation. Needless to say, it is sometimes possible to operate the engine in exactly the same way as a conventional two-stroke engine.
第１図は本発明の一実施例における２サイクル機関の始
動装置の概略縦断面図、第２図は第２図の始動装置の要
部拡大図、第３−Ａ図から第３−Ｆ図までは第１図の始
動装置の作動状態を示す一連の説明図、第４図は本発明
の始動装置の開弁タイミングを示す線図、第５図は従来
の２サイクル機関の概略縦断面図である。
１・・・燃焼室、９・・・開閉弁、１０・・・サブチャ
ンバ、１１・・・弁ばね、１２・・・クランク軸、１３
・・・カム軸、１４・・・タペット、１５・・・ロッド
、１６・・・弁腕、１６Ａ・・・偏心弁腕軸、１７・・
・タペットばね。Fig. 1 is a schematic vertical sectional view of a starting device for a two-cycle engine according to an embodiment of the present invention, Fig. 2 is an enlarged view of main parts of the starting device in Fig. 2, and Figs. 3-A to 3-F. The figures up to 1 are a series of explanatory diagrams showing the operating state of the starting device shown in FIG. 1, FIG. 4 is a diagram showing the valve opening timing of the starting device of the present invention, and FIG. 5 is a schematic vertical cross-sectional view of a conventional two-stroke engine. It is. DESCRIPTION OF SYMBOLS 1... Combustion chamber, 9... Opening/closing valve, 10... Subchamber, 11... Valve spring, 12... Crankshaft, 13
...Camshaft, 14...Tappet, 15...Rod, 16...Valve arm, 16A...Eccentric valve arm shaft, 17...
・Tappet spring.
Claims (1)
室を設けると共に、該開閉弁を該２サイクル機関の始動
時においてのみ駆動可能で、かつクランク軸の回転数の
半分の回転数に同期したカム軸からなる動弁装置を設け
たことを特徴とする２サイクル機関の始動装置。An air chamber is provided that communicates with the combustion chamber of the two-stroke engine via an on-off valve, and the on-off valve can be driven only when the two-stroke engine is started, and is synchronized to a rotation speed that is half the rotation speed of the crankshaft. A starting device for a two-stroke engine, characterized in that it is equipped with a valve train consisting of a camshaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26646284A JPS61145307A (en) | 1984-12-19 | 1984-12-19 | Starter device for two-cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26646284A JPS61145307A (en) | 1984-12-19 | 1984-12-19 | Starter device for two-cycle engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61145307A true JPS61145307A (en) | 1986-07-03 |
Family
ID=17431262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26646284A Pending JPS61145307A (en) | 1984-12-19 | 1984-12-19 | Starter device for two-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61145307A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104074660A (en) * | 2013-03-28 | 2014-10-01 | 比亚迪股份有限公司 | Car engine starting method, car engine starting system and car |
-
1984
- 1984-12-19 JP JP26646284A patent/JPS61145307A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104074660A (en) * | 2013-03-28 | 2014-10-01 | 比亚迪股份有限公司 | Car engine starting method, car engine starting system and car |
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