JPH064004Y2 - Starting decompression device for internal combustion engine - Google Patents
Starting decompression device for internal combustion engineInfo
- Publication number
- JPH064004Y2 JPH064004Y2 JP1989011090U JP1109089U JPH064004Y2 JP H064004 Y2 JPH064004 Y2 JP H064004Y2 JP 1989011090 U JP1989011090 U JP 1989011090U JP 1109089 U JP1109089 U JP 1109089U JP H064004 Y2 JPH064004 Y2 JP H064004Y2
- Authority
- JP
- Japan
- Prior art keywords
- chamber
- internal combustion
- seat opening
- combustion engine
- cylinder
- 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 - Lifetime
Links
Landscapes
- Valve Device For Special Equipments (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Description
【考案の詳細な説明】 産業上の利用分野 本考案は内燃機関の始動減圧装置に関する。TECHNICAL FIELD The present invention relates to a starting pressure reducing device for an internal combustion engine.
従来の技術 内燃機関の始動時にピストンの圧縮行程で生じる抵抗を
減少して内燃機関の始動を容易する減圧装置が知られて
いるが、従来の減圧装置は、内燃機関の始動時に装置を
手で操作するものや、電動で装置を作動させるもの等で
あり、人力や電力を必要とし、操作者の熟練を要し、ま
た構造が複雑になって製作に多大の費用を要する等の不
都合があった。2. Description of the Related Art A decompression device that reduces the resistance generated in the compression stroke of a piston at the time of starting an internal combustion engine to facilitate starting of the internal combustion engine is known, but the conventional decompression device manually operates the device when starting the internal combustion engine. There are inconveniences such as those to be operated and those to operate the device electrically, which require human power and electric power, require skill of the operator, and have a complicated structure which requires a great deal of cost for manufacturing. It was
考案が解決しようとする課題 そこで、本考案はこのような従来の技術の不都合を取除
くためになされたものであり、人力や電力を必要とせず
に、シリンダ室内の圧力変化によって自動的に作動し、
さらに構造が小型であり、機関出力の損失を最小限にお
さえ、且つカーボンの付着を防止して耐久性を高めた内
燃機関の始動減圧装置を提供することを目的とする。DISCLOSURE OF THE INVENTION Therefore, the present invention has been made in order to eliminate such inconveniences of the conventional technology, and automatically operates according to the pressure change in the cylinder chamber without requiring human power or electric power. Then
Another object of the present invention is to provide a starting decompression device for an internal combustion engine, which has a small structure, minimizes engine output loss, and prevents carbon from adhering to improve durability.
課題を解決するための手段 即ち、本考案に係る内燃機関の始動減圧装置は、内燃機
関のシリンダに取付けられる本体に筒状室を形成し、該
筒状室内にピストン弁体を摺動可能に配置し、前記シリ
ンダのシリンダ室に近接する前記本体の前端部に前弁座
開口を形成すると共に前記筒状室内に後弁座開口を形成
し、前記ピストン弁体に前記前弁座開口及び後弁座開口
をそれぞれ開閉する前弁部及び後弁部を設け、前記内燃
機関の停止時には前記前弁部を開状態に維持し且つ前記
後弁部を閉状態に維持するように前記ピストン弁体に作
用するばねを設け、機関始動時には前記ピストン弁体を
前記ばねの作用に抗して移動させて前記前弁部及び後弁
部の両方を開状態にして前記シリンダ室を前記筒状室と
外部へ連通し、機関正常運転時には前記ピストン弁体を
前記ばねの作用に抗して更に移動させて前記前弁部を前
記前弁座開口に圧着させて閉状態にする構成を特徴とす
る。Means for Solving the Problems That is, the starting decompression device for an internal combustion engine according to the present invention forms a cylindrical chamber in a main body attached to a cylinder of the internal combustion engine, and allows a piston valve element to slide in the cylindrical chamber. And a front valve seat opening is formed in the front end portion of the main body adjacent to the cylinder chamber of the cylinder, and a rear valve seat opening is formed in the cylindrical chamber, and the front valve seat opening and the rear valve seat are formed in the piston valve body. A front valve portion and a rear valve portion that open and close the valve seat openings are provided, and the piston valve body is configured to maintain the front valve portion in the open state and the rear valve portion in the closed state when the internal combustion engine is stopped. A spring that acts on the cylinder chamber and the cylindrical chamber as the cylindrical chamber when the engine is started, the piston valve body is moved against the action of the spring to open both the front valve portion and the rear valve portion. Communicates to the outside, and when the engine is operating normally, the fix The valve body is further moved against the action of the spring to press the front valve portion against the front valve seat opening so as to be in a closed state.
作用 従って、機関がリコイル式始動器等により始動されてシ
リンダ室中の圧力が高まると、ピストン弁体はばねの作
用に抗して移動して後弁部を開状態にし、シリンダ室内
の始動を困難にせしめるような過大な圧力を外部へ逃し
てシリンダ室内圧を始動適性値まで減圧し、機関が正常
に運転し始めてシリンダ室内の圧力が更に上昇すると、
ピストン弁体は更にばねの作用に抗して移動して前弁部
を閉状態にし、それによりシリンダ室に近接する本体の
前端部においてシリンダ室と外部との連通を遮断して正
常運転中のシリンダ室内の高圧力を維持する。Therefore, when the engine is started by the recoil type starter etc. and the pressure in the cylinder chamber rises, the piston valve body moves against the action of the spring to open the rear valve part and start the cylinder chamber. If the excessive pressure that makes it difficult is released to the outside and the cylinder chamber pressure is reduced to the appropriate value for starting, and the engine starts operating normally and the pressure in the cylinder chamber rises further,
The piston valve body further moves against the action of the spring to close the front valve portion, thereby cutting off the communication between the cylinder chamber and the outside at the front end portion of the main body which is close to the cylinder chamber, and the normal operation is being performed. Maintain high pressure in the cylinder chamber.
実施例 次に、本考案を図面の実施例に基づいて説明する。Embodiment Next, the present invention will be described based on an embodiment of the drawings.
図示した実施例の始動減圧装置１は、空冷二サイクルガ
ソリンエンジン等の内燃機関のシリンダ２に螺着等の適
当な手段によって取付けられた本体３を有し、該本体３
の前部分４は前記シリンダ２に形成された通孔５内に嵌
合されて支持され、前記本体３の後部分６はシリンダ２
から外側へ突出している。前記本体３内には、円形断面
の筒状室７が形成され、この筒状室７内に後述するピス
トン弁体８が配置されている。前記筒状室７は、前記本
体３の前部分４内に配設された小さい内径の前室９と、
前記本体３の後部分６内に配設された大きい内径の後室
１０とを構成し、前記前室９内に前記ピストン弁体８の
中間支持部１１が、その両側に平行面取りによって前後
方向の連通路を形成して、軸線方向へ摺動可能に配置さ
れている。The starting decompression device 1 of the illustrated embodiment has a main body 3 attached to a cylinder 2 of an internal combustion engine such as an air-cooled two-cycle gasoline engine by a suitable means such as screwing.
The front portion 4 of the main body 3 is fitted and supported in the through hole 5 formed in the cylinder 2, and the rear portion 6 of the main body 3 is
Protruding outward from. A cylindrical chamber 7 having a circular cross section is formed in the main body 3, and a piston valve body 8 described later is arranged in the cylindrical chamber 7. The cylindrical chamber 7 includes a front chamber 9 having a small inner diameter arranged in the front portion 4 of the main body 3,
A rear chamber 6 having a large inner diameter is provided in the rear portion 6 of the main body 3, and an intermediate supporting portion 11 of the piston valve body 8 is provided in the front chamber 9 on both sides thereof by parallel chamfering in the front-back direction. And forms a communication passage of, and is slidable in the axial direction.
前記本体３の前部分４は、その前端部１２に前記シリン
ダ２のシリンダ室１３の方へ末広がりの円錐面の前弁座
開口１４を形成しており、該前弁座開口１４は、始動減
圧装置１の前記本体３の前部分４内の前室９をシリンダ
２のシリンダ室１３へ直接に連通している。前記ピスト
ン弁体８は、前記中間支持部１１から軸線方向前方へ延
びる前弁部１６を設けている。該前弁部１６は、前記本
体３の前部分４内の前室９から前記前弁座開口１４を通
して前記シリンダ室１３の方へ突出し、前記前弁部１６
の外周面は、前記前弁座開口１４に密着し得るように、
前記シリンダ室１３の方へ末広がりの円錐面に形成され
ている。The front portion 4 of the main body 3 has a front valve seat opening 14 having a conical surface diverging toward the cylinder chamber 13 of the cylinder 2 at the front end portion 12, and the front valve seat opening 14 is used for starting decompression. The front chamber 9 in the front portion 4 of the body 3 of the device 1 is in direct communication with the cylinder chamber 13 of the cylinder 2. The piston valve body 8 is provided with a front valve portion 16 that extends axially forward from the intermediate support portion 11. The front valve portion 16 projects from the front chamber 9 in the front portion 4 of the main body 3 through the front valve seat opening 14 toward the cylinder chamber 13,
The outer peripheral surface of the so that it can be in close contact with the front valve seat opening 14,
It is formed in a conical surface that widens toward the cylinder chamber 13.
一方、前記本体３の後部分６は、前記前室９に近い後室
１０の内周面に後方へ末広がりの円錐面の後弁座開口１
７を形成しており、前記後室１０の前記後弁座開口１７
に隣接した下側壁には、前記後室１０の内部を外部へ連
通する通孔１８が形成されている。前記ピストン弁８の
前記中間支持部１１から後方へ延びるピストン軸１５の
後端に、前記後室１０内をその軸線に沿って前後に摺動
自在な後弁部１９を設けており、該後弁部１９は、止め
輪又はナット等の適当な固定具によって前記ピストン軸
１５に固定されている。そして、前記後弁部１９のその
前端外周面は、前記後弁座開口１７に密着し得るように
後方へ末広がりの円錐面に形成されている。前記本体３
の後部分６の後端のばね座２０が固定されており、該ば
ね座２０の中央部には、前記後室１０の内部を外部へ連
通する通孔２１を形成してピストン弁体８の前後方向へ
の摺動に支障を与えぬ様配慮している。このばね座２０
と前記ピストン弁体８の後弁部１９との間に圧縮コイル
ばね２２が設けられている。該圧縮コイルばね２２は、
前記ピストン弁体８全体を図示した前方位置へ押圧し、
その位置で後弁部１９を後弁座開口１７に圧着して筒状
室７の前室９及び後室１０の間を閉鎖する閉状態に維持
して、外部からほこり等が侵入せぬ様にすると同時に、
前弁部１６を前弁座開口１４から前方へ離して前室９を
シリンダ室１３へ開いた開状態に維持する。On the other hand, the rear portion 6 of the main body 3 has a conical surface rear valve seat opening 1 that spreads backward toward the inner peripheral surface of the rear chamber 10 near the front chamber 9.
7 is formed, and the rear valve seat opening 17 of the rear chamber 10 is formed.
A through hole 18 that communicates the inside of the rear chamber 10 to the outside is formed on the lower side wall adjacent to. At the rear end of the piston shaft 15 extending rearward from the intermediate support portion 11 of the piston valve 8, there is provided a rear valve portion 19 slidable back and forth in the rear chamber 10 along the axis thereof. The valve portion 19 is fixed to the piston shaft 15 by a suitable fixing tool such as a retaining ring or a nut. The outer peripheral surface of the front end of the rear valve portion 19 is formed into a conical surface that widens rearward so as to be in close contact with the rear valve seat opening 17. The main body 3
A spring seat 20 at the rear end of the rear portion 6 is fixed, and a through hole 21 for communicating the inside of the rear chamber 10 to the outside is formed in the central portion of the spring seat 20 to form the piston valve body 8 Care is taken not to hinder sliding in the front-back direction. This spring seat 20
A compression coil spring 22 is provided between and the rear valve portion 19 of the piston valve body 8. The compression coil spring 22 is
The entire piston valve body 8 is pushed to the illustrated front position,
At that position, the rear valve portion 19 is pressure-bonded to the rear valve seat opening 17 to maintain a closed state in which the front chamber 9 and the rear chamber 10 of the cylindrical chamber 7 are closed so that dust or the like does not enter from the outside. At the same time
The front valve portion 16 is moved forward from the front valve seat opening 14 to maintain the front chamber 9 in the open state in which it is opened to the cylinder chamber 13.
ピストン弁体８の前弁部１６及び後弁部１９の配置関係
並びに圧縮コイルばね２２の強さは、ピストン弁体８が
次のように作動するように選ばれる。即ち、機関停止時
には、ピストン弁体８を図示した前方位置に保持する
が、機関始動操作時に、シリンダ２のシリンダ室１３内
の圧力が、例えば、リコイル式始動器を備えた小排気量
の二サイクル内燃機関において、約０．８Kg/cm2に達す
ると、手動始動操作が容易にできる程度のこの低い圧力
でも後弁部１９には大きな力として作用し、ピストン弁
体８全体を後方へ容易に移動させて後弁部１９を後弁座
開口１７から離し始め、前弁部１６及び後弁部１９の両
方を開状態にし、それによりシリンダ室１３内の圧力を
前弁座開口１４、前室９、中間支持部１１の外周に成形
された連通路、後弁座開口１７、後弁部１９の先頭部外
周に形成された環状空間２３及び通孔１８を通して外部
へ解放し、シリンダ室１３内の上昇する圧力を低減させ
て機関始動を容易にし、機関が連続回転してシリンダ室
１３内の圧力が正常運転圧力、例えば約２〜２．２Kg/c
m2以上に上昇すると、ピストン弁体８は圧縮コイルばね
２２の作用に抗して更に後方へ移動して、前弁部１６を
前弁座開口１４へ圧着させて前弁部１６で通路を閉状態
にし、シリンダ室１３は密閉され、以後内燃機関は正常
に運転される。なお、内燃機関が停止してシリンダ室１
３内の圧力が低下すると、圧縮コイルばね２２の付勢力
によってピストン弁体８が前方へ移動し、前弁部１６側
の通路は開き、後弁部１９側の通路１８は閉じられ、内
部へごみ等が侵入するのを防止する。このようにして、
本考案による始動減圧装置１は、人力及び電力等を必要
とせずに自動的に作動して機関始動を容易にし、機関始
動後はシリンダ室１３に近接する本体３の前端１２の前
弁部１６でシリンダ室１３を密閉するので、機関出力の
損失を最小限におさえることができ、且つ始動減圧装置
１内へのカーボンの付着を防止して耐久性を高めること
ができる。The positional relationship between the front valve portion 16 and the rear valve portion 19 of the piston valve body 8 and the strength of the compression coil spring 22 are selected so that the piston valve body 8 operates as follows. That is, when the engine is stopped, the piston valve body 8 is held at the front position shown in the figure, but when the engine is started, the pressure in the cylinder chamber 13 of the cylinder 2 is, for example, two small displacements provided with a recoil type starter. In a cycle internal combustion engine, when the pressure reaches about 0.8 kg / cm 2 , even at such a low pressure that a manual starting operation can be easily performed, it acts as a large force on the rear valve portion 19, so that the entire piston valve body 8 can be easily moved backward. To start separating the rear valve portion 19 from the rear valve seat opening 17, and open both the front valve portion 16 and the rear valve portion 19 to open the pressure in the cylinder chamber 13 to the front valve seat opening 14, The chamber 9, the communication passage formed on the outer periphery of the intermediate support portion 11, the rear valve seat opening 17, the annular space 23 formed on the outer periphery of the front portion of the rear valve portion 19, and the through hole 18 are released to the outside, and the cylinder chamber 13 is opened. Reduce the rising pressure in the machine It facilitates the starting of the engine, the engine continuously rotates, and the pressure in the cylinder chamber 13 is the normal operating pressure, for example, about 2 to 2.2 kg / c.
When the piston valve element 8 is moved upwards to m 2 or more, the piston valve element 8 moves further rearward against the action of the compression coil spring 22, and the front valve portion 16 is crimped to the front valve seat opening 14 to open the passage in the front valve portion 16. The cylinder chamber 13 is closed and the internal combustion engine is normally operated thereafter. In addition, when the internal combustion engine is stopped, the cylinder chamber 1
When the pressure in 3 decreases, the piston valve body 8 moves forward by the urging force of the compression coil spring 22, the passage on the side of the front valve portion 16 opens, and the passage 18 on the side of the rear valve portion 19 closes. Prevent dust from entering. In this way
The starting decompression device 1 according to the present invention automatically operates without requiring human power and electric power to facilitate engine starting, and after starting the engine, the front valve portion 16 of the front end 12 of the main body 3 close to the cylinder chamber 13 is started. Since the cylinder chamber 13 is hermetically closed by the above, loss of engine output can be minimized, and carbon can be prevented from adhering to the inside of the starting decompression device 1 to improve durability.
考案の効果 以上説明した本考案の構成により、本考案は、機関始動
時に人力や電力等を必要とせずに、シリンダ室内を自動
的に減圧して機関始動を容易にし、機関の正常運転中は
シリンダ室に近接する前弁部でシリンダ室を遮断するの
で、機関出力の損失をふせぎ、装置へのカーボンの付着
を防止して耐久性を高め、また前弁部をシリンダ内に配
置したので、構造が小型軽量であり且つ製作が容易であ
る等の効果を奏する。Effect of the Invention With the configuration of the present invention described above, the present invention automatically depressurizes the cylinder chamber to facilitate engine start without requiring human power or electric power when starting the engine, and during normal operation of the engine. Since the front valve part close to the cylinder chamber shuts off the cylinder chamber, it prevents loss of engine output, prevents carbon from adhering to the device and improves durability, and because the front valve part is located inside the cylinder, The structure is small and lightweight, and the manufacturing is easy.
第１図は本考案に係わる一実施例を示す内燃機関始動減
圧装置の断面図である。 １……始動減圧装置、２……シリンダ、 ３……本体、７……筒状室、８……ピストン弁体、 １２……本体の前端部、１３……シリンダ室、 １４……前弁座開口、１６……前弁部、 １７……後弁座開口、１９……後弁部、 ２２……圧縮コイルばね。FIG. 1 is a sectional view of an internal combustion engine starting decompression device showing an embodiment according to the present invention. 1 ... Start-up pressure reducing device, 2 ... Cylinder, 3 ... Main body, 7 ... Cylindrical chamber, 8 ... Piston valve body, 12 ... Front end of main body, 13 ... Cylinder chamber, 14 ... Front valve Seat opening, 16 ... front valve part, 17 ... rear valve seat opening, 19 ... rear valve part, 22 ... compression coil spring.
───────────────────────────────────────────────────── フロントページの続き (72)考案者 松林 龍彦 東京都三鷹市下連雀７丁目５番１号 株式 会社共立内 (56)参考文献 特開 昭58−23246（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Tatsuhiko Matsubayashi 7-5-1, Shimorenjaku, Mitaka-shi, Tokyo Kyoritsuuchi, Inc. (56) References JP-A-58-23246 (JP, A)
Claims (1)
本体（３）に筒状室（７）を形成し、該筒状室内にピス
トン弁体（８）を摺動可能に配置し、前記シリンダのシ
リンダ室（１３）に近接する前記本体の前端部（１２）
に前弁座開口（１４）を形成すると共に前記筒状室内に
後弁座開口（１７）を形成し、前記ピストン弁体に前記
前弁座開口及び後弁座開口をそれぞれ開閉する前弁部
（１６）及び後弁部（１９）を設け、前記内燃機関の停
止時には前記前弁部を開状態に維持し且つ前記後弁部を
閉状態に維持するように前記ピストン弁体に作用するば
ね（２２）を設け、機関始動時には前記ピストン弁体を
前記ばねの作用に抗して移動させて前記前弁部及び後弁
部の両方を開状態にして前記シリンダ室を前記筒状室と
外部へ連通し、機関正常運転時には前記ピストン弁体を
前記ばねの作用に抗して更に移動させて前記前弁部を前
記前弁座開口に圧着させて閉状態にすることを特徴とす
る内燃機関の始動減圧装置。1. A cylindrical chamber (7) is formed in a main body (3) attached to a cylinder (2) of an internal combustion engine, and a piston valve body (8) is slidably arranged in the cylindrical chamber, Front end (12) of the body close to the cylinder chamber (13) of the cylinder
A front valve seat opening (14) formed in the cylindrical chamber and a rear valve seat opening (17) formed in the cylindrical chamber, and the piston valve body opens and closes the front valve seat opening and the rear valve seat opening, respectively. (16) and a rear valve portion (19) are provided, and the spring acts on the piston valve body so as to maintain the front valve portion in the open state and the rear valve portion in the closed state when the internal combustion engine is stopped. (22) is provided, and when the engine is started, the piston valve body is moved against the action of the spring to open both the front valve portion and the rear valve portion so that the cylinder chamber and the cylinder chamber are external. Internal combustion engine characterized in that the piston valve body is further moved against the action of the spring during normal operation of the engine to press the front valve portion against the front valve seat opening and close the state. Starting decompression device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989011090U JPH064004Y2 (en) | 1989-02-01 | 1989-02-01 | Starting decompression device for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989011090U JPH064004Y2 (en) | 1989-02-01 | 1989-02-01 | Starting decompression device for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02105504U JPH02105504U (en) | 1990-08-22 |
| JPH064004Y2 true JPH064004Y2 (en) | 1994-02-02 |
Family
ID=31219335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989011090U Expired - Lifetime JPH064004Y2 (en) | 1989-02-01 | 1989-02-01 | Starting decompression device for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH064004Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2501175Y2 (en) * | 1991-03-04 | 1996-06-12 | 川崎重工業株式会社 | Engine decompressor |
| JP2556276Y2 (en) * | 1991-06-04 | 1997-12-03 | 川崎重工業株式会社 | Engine start decompression device |
| JP2010164023A (en) * | 2009-01-19 | 2010-07-29 | Mitsui Eng & Shipbuild Co Ltd | Hydraulic passage structure of hydraulic cylinder block |
-
1989
- 1989-02-01 JP JP1989011090U patent/JPH064004Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02105504U (en) | 1990-08-22 |
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| LAPS | Cancellation because of no payment of annual fees |