JPS6132143Y2 - - Google Patents
Info
- Publication number
- JPS6132143Y2 JPS6132143Y2 JP313881U JP313881U JPS6132143Y2 JP S6132143 Y2 JPS6132143 Y2 JP S6132143Y2 JP 313881 U JP313881 U JP 313881U JP 313881 U JP313881 U JP 313881U JP S6132143 Y2 JPS6132143 Y2 JP S6132143Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- decompression
- lever
- exhaust
- decompression device
- 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
- 230000006837 decompression Effects 0.000 claims description 33
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Landscapes
- Valve Device For Special Equipments (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、ハンドル、ロープ等による手起動の
デイーゼルエンジンで、起動の容易化を図るため
にデコンプ装置を備えたものに関し、特にこのデ
コンプ装置を使用することによる低温の起動性を
向上させるものに関する。[Detailed description of the invention] [Field of industrial application] The present invention relates to a diesel engine that is manually started using a handle, rope, etc. and is equipped with a decompression device to facilitate starting. This invention relates to improving low-temperature start-up performance by using.
手起動のデイーゼルエンジンでは圧縮圧力が非
常に高くてクランク軸の回転に多大な力を要し、
起動が困難であることからデコンプ装置が装備さ
れている。そして、起動時にデコンプ装置により
排気弁を開いてシリンダ内を減圧するこによりク
ランク軸の手回しを容易に行い、勢い良く回転し
てフライホイールにエネルギーが充分貯えられた
ところで、デコンプ解除して圧縮を急激に行い着
火するようになつている。
In hand-started diesel engines, the compression pressure is very high and it takes a lot of force to rotate the crankshaft.
Because it is difficult to start, it is equipped with a decompression device. At startup, the decompression device opens the exhaust valve and reduces the pressure inside the cylinder, making it easy to turn the crankshaft by hand.When the flywheel rotates vigorously and enough energy has been stored, the decompression is released and compression begins. It is starting to occur rapidly and ignite.
しかるに、低温起動時には空気の粘度が低下
し、オイルの粘度が増して圧縮温度が上昇しにく
く、このため上述のデコンプ装置を使用しても起
動が非常に難しくなる。
However, during low-temperature startup, the viscosity of the air decreases and the viscosity of the oil increases, making it difficult to increase the compression temperature, making startup extremely difficult even if the above-mentioned decompression device is used.
この点に関し、実開昭55−35391号公報に記載
の先行技術では、デコンプ時に吸気通路内の空気
を加熱することで低温時の起動性向上を図つてい
るが、これは吸気通路内に予熱器を備える必要が
あり、構造が複雑で高価なものとなる。 Regarding this point, the prior art described in Japanese Utility Model Application Publication No. 55-35391 aims to improve startup performance at low temperatures by heating the air in the intake passage during decompression. It is necessary to prepare a container, which results in a complicated and expensive structure.
本発明は、このような点に鑑みてなされたもの
で、デコンプ装置による減圧作用時に排出される
ガスも或る程度圧縮されて温度上昇している点に
着目し、排気弁以降の排気系に開閉弁を設け、デ
コンプ装置による減圧作用時に開閉弁を閉じて排
出されるガスを滞留し、燃焼室回りの予熱等に利
用することで低温の起動性を向上するようにした
デイーゼルエンジンの起動装置を提供するもので
ある。
The present invention has been made in view of these points, and focuses on the fact that the gas discharged during the decompression action of the decompression device is also compressed to a certain extent and the temperature rises. A starting device for a diesel engine that is equipped with an on-off valve and is designed to improve starting performance at low temperatures by closing the on-off valve and retaining the exhausted gas when the decompression device reduces pressure, and using it for preheating the combustion chamber and other purposes. It provides:
以下、図面を参照して本考案の一実施例を具体
的に説明すると、図において符号１はデイーゼル
エンジンのシリンダヘツドであり、このシリンダ
ヘツド１の排気ポート２に排気弁３が設けられる
と共に、図示しない吸気及び燃料噴射等の機構が
装備され、シリンダヘツド１に被冠されるロツカ
カバー４内に動弁機構５が設けられる。動弁機構
５はロツカ軸６にロツカアーム７が略中心を回転
自在に嵌合して天秤式に支持され、このロツカア
ーム７の一端の下部に上記排気弁３のステムエン
ドが当接し、その他端の調整ねじ８にカム軸から
のプツシユロツド９が連設する。また、排気弁３
のステムエンド側には弁ばね受１０が取付けられ
て、この弁ばね受１０とシリンダヘツド１の間に
弁ばね１１が排気弁３を閉じる方向にばね力を付
勢すべく、介設され、プツシユロツド９の押上げ
によりロツカアーム７を揺動し、排気弁３を弁ば
ね１１に抗して下げることで開くようになつてい
る。
Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, reference numeral 1 is a cylinder head of a diesel engine, and an exhaust valve 3 is provided at an exhaust port 2 of the cylinder head 1. A valve operating mechanism 5 is provided within a rocker cover 4 which is equipped with mechanisms such as intake and fuel injection (not shown) and which is covered with the cylinder head 1. The valve mechanism 5 is supported in a scale-like manner with a rocker arm 7 fitted around the rocker shaft 6 so as to be rotatable approximately at its center.The stem end of the exhaust valve 3 is in contact with the lower part of one end of the rocker arm 7, and A push rod 9 from the camshaft is connected to the adjustment screw 8. In addition, exhaust valve 3
A valve spring holder 10 is attached to the stem end side of the exhaust valve 3, and a valve spring 11 is interposed between the valve spring holder 10 and the cylinder head 1 in order to apply a spring force in a direction to close the exhaust valve 3. By pushing up the push rod 9, the rocker arm 7 is swung, and the exhaust valve 3 is opened by lowering it against the valve spring 11.
そこでこのような動弁機構５にデコンプ装置１
２が設けられるもので、このデコンプ装置１２は
ロツカアーム７のプツシユロツド９側の端部にデ
コンプ調整ねじ１３が螺着され、このねじ１３の
下にデコンプレバー１４を有するデコンプ軸１５
の先端の切欠き１５ａの部分が対向して設置され
る。これによりデコンプレバー１４が図のように
略垂直に立つている場合は切欠き１５ａがねじ１
３と対向することでロツカアーム７をフリーの状
態にし、デコンプレバー１４を矢印の方向に倒す
とデコンプ軸１５の円周部１５ｂがねじに接して
それを押上げるようになり、このため排気弁３が
下り、プツシユロツド９の昇降に関係なく開いた
状態に保持してシリンダ内の減圧を行う。 Therefore, a decompression device 1 is installed in such a valve mechanism 5.
This decompression device 12 has a decompression adjustment screw 13 screwed onto the end of the rocker arm 7 on the push rod 9 side, and a decompression shaft 15 having a decompression lever 14 under the screw 13.
The notch portions 15a at the tips of the two are placed opposite to each other. As a result, when the decompression lever 14 is standing approximately vertically as shown in the figure, the notch 15a is connected to the screw 1.
3, the rocker arm 7 is freed, and when the decompression lever 14 is tilted in the direction of the arrow, the circumferential portion 15b of the decompression shaft 15 comes into contact with the screw and pushes it up. is lowered, and the pressure inside the cylinder is reduced by keeping it open regardless of whether the push rod 9 is raised or lowered.
このような構成において本考案によると、排気
系の例えば排気ポート２出口付近の内部に開閉弁
１６が取付けられて弁軸１６ａの回転により排気
ポート２を開閉するようにしてあり、弁軸１６ａ
にレバー１７が一体的に連設される。そして、シ
リンダヘツド１側のばね受１８とレバー１７との
間に戻しばね１９が開閉弁１６を開く方向にばね
力を付勢すべく介設され、レバー１７はロツド２
０を介して上記デコンプ装置１２のデコンプレバ
ー１４に減圧操作の場合に開閉弁１６を閉じ、そ
の減圧解除の場合に開閉弁１６を開くように連動
構成される。更に、レバー１７は開閉弁１６を開
いた運転位置でストツパ２１に当接してその状態
を保持するようになつている。 In such a configuration, according to the present invention, an on-off valve 16 is installed inside the exhaust system, for example near the outlet of the exhaust port 2, and the exhaust port 2 is opened and closed by rotation of the valve shaft 16a.
A lever 17 is integrally connected to the lever 17. A return spring 19 is interposed between the spring receiver 18 on the cylinder head 1 side and the lever 17 in order to bias the spring force in the direction of opening the on-off valve 16, and the lever 17 is connected to the rod 2.
0 to the decompression lever 14 of the decompression device 12 so that the on-off valve 16 is closed when the pressure is reduced and the on-off valve 16 is opened when the pressure reduction is released. Furthermore, the lever 17 is adapted to abut against the stopper 21 and maintain that state in the operating position where the on-off valve 16 is open.
本考案はこのように構成されているから、起動
時デコンプ装置１２のデコンプレバー１４を矢印
の方向に押して倒すと、上述のようにデコンプ軸
１５の円周部１５ｂによる押上げ作用で排気弁３
が開いた状態に保持されて、シリンダ内が減圧さ
れクランク軸の手回しが容易に行われ得る。一方
このときデコンプレバー１４に連動してロツド２
０が移動することにより、レバー１７と共に開閉
弁１６の弁軸１６ａが回つて開閉弁１６は排気ポ
ート２を閉じるようになり、シリンダから排気口
を介して排気ポート２内に出入するガスの熱慣性
により排気ポート２内の温度が上り、また、シリ
ンダで或る程度圧縮して温度上昇したガスが、排
気ポート２内に滞留してシリンダヘツド１の排気
ポート、燃焼室周囲を予熱するようになる。従つ
て低温時エンジン本体と共に吸入される空気が冷
えている場合に、空気の圧縮温度の上昇が促進さ
れるのであり、更に排気ポート２に排出してそこ
に滞留するガスは未着火のもので空気中に燃料が
多量に混入されていて、これが開いている排気弁
３を経て燃焼室側に逆流する等して再利用される
ようにもなり、非常に着火起動し易い状態にな
る。 Since the present invention is configured in this way, when the decompression lever 14 of the decompression device 12 is pushed in the direction of the arrow at the time of start-up and brought down, the exhaust valve 3 is pushed up by the circumferential portion 15b of the decompression shaft 15 as described above.
is held open, the pressure inside the cylinder is reduced, and the crankshaft can be easily rotated by hand. On the other hand, at this time, the rod 2 is moved in conjunction with the decompression lever 14.
0 moves, the valve shaft 16a of the on-off valve 16 rotates together with the lever 17, so that the on-off valve 16 closes the exhaust port 2, and the heat of the gas flowing in and out of the exhaust port 2 from the cylinder via the exhaust port is removed. The temperature inside the exhaust port 2 rises due to inertia, and the gas, which has been compressed to some extent in the cylinder and whose temperature has risen, stays in the exhaust port 2 and preheats the exhaust port of the cylinder head 1 and the surroundings of the combustion chamber. Become. Therefore, when the air that is taken in with the engine body is cold at low temperatures, the compression temperature of the air is accelerated, and furthermore, the gas that is discharged to the exhaust port 2 and remains there is not ignited. A large amount of fuel is mixed in the air, which flows back into the combustion chamber through the open exhaust valve 3 and is reused, making it very easy to start ignition.
こうしてクランク軸が勢い良く回転しフライホ
イールにエネルギが充分貯えられ、更に燃焼室側
で着火し易い状態になつたところで、デコンプレ
バー１４の押し倒しを解く。すると、戻しばね１
９によりレバー１７と開閉弁１６の弁軸１６ａが
逆に回つて戻り、開閉弁１６が開くと同時に、デ
コンプレバー１４が略垂直に起立してストツパ２
１によりこの状態が保持されるのであり、これに
より排気弁３が閉じて減圧が解除され、燃焼室で
容易に着火することでエンジンの運転が開始す
る。 In this way, the crankshaft rotates vigorously, enough energy is stored in the flywheel, and when the combustion chamber side becomes more likely to ignite, the decompression lever 14 is released. Then, return spring 1
9, the lever 17 and the valve shaft 16a of the on-off valve 16 are rotated back in the opposite direction, and at the same time the on-off valve 16 opens, the decompression lever 14 stands up substantially vertically and the stopper 2
1, this state is maintained, and as a result, the exhaust valve 3 closes, the reduced pressure is released, and the engine starts operating by easily igniting in the combustion chamber.
このように本考案によると、起動時或る程度圧
縮して温度上昇したガスが従来は単に外部に排出
されていたのであるが、排気ポート２等の内部に
設けた開閉弁１６で滞留して燃焼室回りの予熱及
び燃焼ガスに再利用し着火し易い状態にするの
で、低温の際の起動性が非常に良くなる。開閉弁
１６はデコンプ装置１２の操作に連動して開閉す
るので操作性が良いと共に動作が確実であり、実
施例ではデコンプ装置１２の操作が手動である
が、これを自動で行う場合は一層操作性が向上
し、クランキングに専念することもできる。
In this way, according to the present invention, the gas that has been compressed to a certain degree at startup and whose temperature has risen, which conventionally was simply discharged to the outside, is retained in the on-off valve 16 provided inside the exhaust port 2, etc. Since it is reused for preheating around the combustion chamber and combustion gas to make it easier to ignite, starting performance at low temperatures is greatly improved. The on-off valve 16 opens and closes in conjunction with the operation of the decompression device 12, so it is easy to operate and operates reliably.In the embodiment, the decompression device 12 is operated manually, but if this is done automatically, the operation will be even easier. This improves your performance and allows you to concentrate on cranking.
第１図は本考案による装置の一実施例を一部断
面して示す正面図、第２図は同要部の側面図であ
る。
１……シリンダヘツド、２………排気ポート、
３……排気弁、５……動弁機構、７……ロツカア
ーム、１２……デコンプ装置、１４……デコンプ
レバー、１５……デコンプ軸、１６……開閉弁、
１７……レバー、２０……ロツド。
FIG. 1 is a partially sectional front view showing an embodiment of the device according to the present invention, and FIG. 2 is a side view of the main parts thereof. 1...Cylinder head, 2...Exhaust port,
3... Exhaust valve, 5... Valve mechanism, 7... Rocker arm, 12... Decompression device, 14... Decompression lever, 15... Decompression shaft, 16... Open/close valve,
17...lever, 20...rod.
Claims (1)
より押上げて上記排気弁を開くことで減圧作用す
るデコンプ装置を備えたデイーゼルエンジンにお
いて、上記排気弁以降の排気系に開閉弁を設け、
該開閉弁を上記デコンプ装置に減圧作用する場合
に閉じるように連動構成したことを特徴とするデ
イーゼルエンジンの起動装置。 In a diesel engine equipped with a decompression device that reduces pressure by pushing up the opposite side of the Rocker arm with a decompression shaft to open the exhaust valve, an on-off valve is provided in the exhaust system after the exhaust valve,
A starting device for a diesel engine, characterized in that the opening/closing valve is configured to be closed when a pressure reduction action is applied to the decompression device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP313881U JPS6132143Y2 (en) | 1981-01-12 | 1981-01-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP313881U JPS6132143Y2 (en) | 1981-01-12 | 1981-01-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57115910U JPS57115910U (en) | 1982-07-17 |
| JPS6132143Y2 true JPS6132143Y2 (en) | 1986-09-18 |
Family
ID=29801570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP313881U Expired JPS6132143Y2 (en) | 1981-01-12 | 1981-01-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6132143Y2 (en) |
-
1981
- 1981-01-12 JP JP313881U patent/JPS6132143Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57115910U (en) | 1982-07-17 |
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