JPS6330485B2 - - Google Patents
Info
- Publication number
- JPS6330485B2 JPS6330485B2 JP54100717A JP10071779A JPS6330485B2 JP S6330485 B2 JPS6330485 B2 JP S6330485B2 JP 54100717 A JP54100717 A JP 54100717A JP 10071779 A JP10071779 A JP 10071779A JP S6330485 B2 JPS6330485 B2 JP S6330485B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- plate
- exhaust
- cylinder
- exhaust passage
- 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
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000002265 prevention Effects 0.000 description 2
- 230000002000 scavenging effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/028—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation for two-stroke engines
- F02D13/0284—Variable control of exhaust valves only
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
この発明はエンジンの回転速度に対応して排気
タイミングが可変できる２サイクルエンジンの排
気バルブ装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to an exhaust valve device for a two-stroke engine that can vary the exhaust timing in accordance with the rotational speed of the engine.
従来の技術
２サイクルエンジンにおいて、シリンダ壁に開
口された排気口上縁部に排気タイミングを変化さ
せる制御弁を設け、この制御弁をエンジンの回転
速度に対応して作動させることにより、全回転域
にわたつて高い出力を得ようとするものがある。
その一例を示すと実開昭51−74623号公報に示す
ようなものである。Prior Art In a two-stroke engine, a control valve that changes the exhaust timing is provided at the upper edge of the exhaust port opened in the cylinder wall, and by operating this control valve in accordance with the rotational speed of the engine, the control valve can be operated over the entire rotational speed range. There are those who try to obtain high output by crossing.
An example of this is shown in Japanese Utility Model Application Publication No. 51-74623.
即ち、シリンダの内周壁にピストンによつて開
閉される排気口および掃気口を形成した２サイク
ルエンジンの前記排気口を有する排気通路にスロ
ツトル弁と連動して排気通路の上部を開閉する回
動制御弁を設けた吹抜け防止装置において、前記
制御弁の胴部表面を軸方向にはシリンダ内周壁の
横断面に沿う凹弧状に形成し、前記胴部をその表
面が可及的に排気口に近接するように設置した２
サイクルエンジンの吹抜け防止装置、
がある。 That is, a two-cycle engine has an exhaust port and a scavenging port that are opened and closed by a piston on the inner circumferential wall of the cylinder, and a rotation control that opens and closes the upper part of the exhaust passage in conjunction with a throttle valve is applied to the exhaust passage having the exhaust port. In a blow-through prevention device provided with a valve, the surface of the body of the control valve is formed in a concave arc shape along the cross section of the inner peripheral wall of the cylinder in the axial direction, and the surface of the body is as close to the exhaust port as possible. 2 installed so that
There is a blow-through prevention device for cycle engines.
発明が解決しようとする問題点
前記従来例にものにおいては、その制御弁が円
板状をなした両端部を備えた胴部と両端部から外
側に延びる軸部からなり、胴部表面を軸方向には
シリンダ内周壁の横断面に沿う凹弧状に形成する
と共に一部をえぐつたものとなつているため、
胴部と軸部が一体構造であり且つ胴部のえぐり
作業を必要とする等からしてその製造が容易でな
く、また該弁が焼損、破損した場合には弁装置全
体を取り替えなければならない、という問題点が
あつた。Problems to be Solved by the Invention In the conventional example, the control valve is composed of a disc-shaped body with both ends and a shaft extending outward from both ends. Since the cylinder is formed in a concave arc shape along the cross section of the cylinder's inner circumferential wall and is partially hollowed out, the body and shaft are integrally constructed, and the body requires gouging. Therefore, there are problems in that it is not easy to manufacture, and if the valve burns out or breaks, the entire valve device must be replaced.
問題点を解決するための手段
この発明は、前記制御弁をバルブ回転軸と板状
バルブの２つの部品によつて構成して、その製造
を容易になし得るようにすると共にバルブの焼
損、破損時には板状バルブのみを簡単に取り替え
得るようにして製造コストの低減をも図つたもの
であり、具体的には、
排気口に近接した排気通路上部にバルブ回転軸
を軸支すると共に、該軸に板状バルブを脱着可能
に取付け、該板状バルブの先端縁をシリンダ内面
と略同一の曲率を有するようにし、且つ該バルブ
の開放時におけるバルブ底面を排気通路の上縁と
略面一とした２サイクルエンジンの排気バルブ装
置、
である。Means for Solving the Problems This invention configures the control valve with two parts, a valve rotating shaft and a plate-shaped valve, so that it can be manufactured easily, and the valve can be easily damaged by burnout or damage. In some cases, it is possible to easily replace only the plate-shaped valve to reduce manufacturing costs. Specifically, the valve rotating shaft is supported on the upper part of the exhaust passage near the exhaust port, and the shaft is A plate valve is removably attached to the plate valve, the tip edge of the plate valve has approximately the same curvature as the inner surface of the cylinder, and the bottom surface of the valve when the valve is opened is approximately flush with the upper edge of the exhaust passage. This is an exhaust valve device for a two-stroke engine.
作 用
高速運転時におけるバルブの開放時には、板状
バルブの先端縁がシリンダ内面と略同一の位置に
あり且つ該バルブの底面が排気通路の上縁と略面
一となつているため、排気通路内に格別の流通抵
抗を生じさせるものがなく、バルブ装置が存在す
るにもかかわらずこれが高速運転時の弊害にもな
らない。また低速運転時等においては、エンジン
の回転速度に対応してバルブを順次閉鎖方向に移
動させることにより、排気タイミングを連続的に
変化させるものであるが、この際も前記板状バル
ブの先端縁がシリンダ内面に略沿つて移動するの
で、バルブ閉鎖は正確・迅速となる。Function: When the valve is opened during high-speed operation, the tip edge of the plate-shaped valve is at approximately the same position as the inner surface of the cylinder, and the bottom surface of the valve is approximately flush with the upper edge of the exhaust passage. There is nothing inside that causes particular flow resistance, and even though there is a valve device, this does not cause any problems during high-speed operation. Furthermore, during low-speed operation, the exhaust timing is continuously changed by sequentially moving the valves in the closing direction in accordance with the rotational speed of the engine. Since the valve moves approximately along the inner surface of the cylinder, valve closing is accurate and rapid.
しかも、該バルブ装置はバルブ回転軸と板状バ
ルブの２つの部品によつて構成し、バルブ回転軸
に板状バルブを脱着可能に取付けたものであるか
ら、各部品毎に製造することができ、且つ板状バ
ルブの焼損、破損時には板状バルブのみを簡単に
取り替え得るものである。 Moreover, since the valve device is composed of two parts, the valve rotation shaft and the plate-shaped valve, and the plate-shaped valve is detachably attached to the valve rotation shaft, each part can be manufactured individually. Moreover, when the plate-shaped bulb is burnt out or damaged, only the plate-shaped bulb can be easily replaced.
実施例
この発明の実施例を以下図面を参照して説明す
る。Embodiments Examples of the present invention will be described below with reference to the drawings.
図において、符号１で示すものはシリンダブロ
ツクで、このシリンダブロツク１には２サイクル
エンジンのシリンダとしてよく知られているよう
に、吸入口２に連通する吸入通路３、排気口４に
連通する排気通路５および掃気口６，７が設けら
れ、これらの各開口２，４，６，７はピストン８
の上下動によつて開閉される。９はクランクケー
ス、１０はシリンダヘツドで、このシリンダヘツ
ド１０には燃焼室１１の臨む点火プラグ１２が螺
着されている。 In the figure, the reference numeral 1 indicates a cylinder block, and this cylinder block 1 has an intake passage 3 communicating with an intake port 2 and an exhaust passage communicating with an exhaust port 4, as is well known as a cylinder of a two-stroke engine. A passage 5 and scavenging ports 6, 7 are provided, each of these openings 2, 4, 6, 7 being connected to a piston 8.
It is opened and closed by the vertical movement of. 9 is a crankcase, 10 is a cylinder head, and a spark plug 12 facing a combustion chamber 11 is screwed into the cylinder head 10.
２０は本発明に係る排気バルブ装置を示し、こ
のバルブ装置２０は、排気口４に近接した排気通
路５の上部に軸支されたバルブ回転軸２１と、該
軸に取付けられた板状バルブ２２とによつて構成
されている。このバルブ回転軸２１は、シリンダ
ブロツク１の側方から排気口４に近接して穿設さ
れた軸孔１ａ，１ｂに挿入され軸支される小径部
２１ａと大径部２１ｂを有し、この大径部２１ｂ
には前記排気通路５の内面の一部を構成するのに
役立つ切欠部２１ｃが設けられている。なお２３
は排気の漏出を阻止するためのＯリング、２４は
Ｏリングホルダである。一方、このバルブ回転軸
２１に固定される板状バルブ２２は、その先端縁
２２ａがシリンダ１内面と略同一の曲率を有する
ように形成され、またその両側縁２２ｂは排気通
路５の内壁面に略沿うような曲面をもつて形成さ
れている。そして、この板状バルブ２２は、前記
バルブ回転軸２１の切欠部２１ｃにねじ２５によ
つてバルブの開放時におけるバルブ２２の底面が
排気通路５の上縁と略面一となるように取付けら
れている。 Reference numeral 20 indicates an exhaust valve device according to the present invention, and this valve device 20 includes a valve rotation shaft 21 pivotally supported at the upper part of the exhaust passage 5 near the exhaust port 4, and a plate-shaped valve 22 attached to the shaft. It is composed of: This valve rotation shaft 21 has a small diameter portion 21a and a large diameter portion 21b which are inserted and supported in shaft holes 1a and 1b that are bored from the side of the cylinder block 1 in the vicinity of the exhaust port 4. Large diameter part 21b
A notch 21c is provided in the exhaust passage 5 to form a part of the inner surface of the exhaust passage 5. Note 23
24 is an O-ring for preventing leakage of exhaust gas, and 24 is an O-ring holder. On the other hand, the plate-shaped valve 22 fixed to the valve rotating shaft 21 is formed so that its tip edge 22a has approximately the same curvature as the inner surface of the cylinder 1, and its both side edges 22b are formed on the inner wall surface of the exhaust passage 5. It is formed with a curved surface that roughly follows it. The plate-shaped valve 22 is attached to the notch 21c of the valve rotation shaft 21 with a screw 25 so that the bottom surface of the valve 22 is substantially flush with the upper edge of the exhaust passage 5 when the valve is opened. ing.
従つて、バルブ回転軸２１をエンジンの回転速
度に対応して第１図において時計方向に回動する
と、板状バルブ２２は順次移動して鎖線の位置と
なる。この結果、排気口４はその上縁側から順次
狭められる。このため、ピストン８が上死点位置
から下降するときにおいては、排気口４が開き始
める時期、即ち排気時期が遅れることになり、そ
の遅れは連続的に調整できる。 Therefore, when the valve rotating shaft 21 is rotated clockwise in FIG. 1 in accordance with the rotational speed of the engine, the plate valve 22 sequentially moves to the position indicated by the chain line. As a result, the exhaust port 4 is gradually narrowed from its upper edge side. Therefore, when the piston 8 descends from the top dead center position, the timing at which the exhaust port 4 begins to open, that is, the exhaust timing is delayed, and this delay can be continuously adjusted.
そして、バルブ回転軸２１の軸端２１ｄをエン
ジンの回転速度に対応してこの回転角を可変する
モータユニツトないし制御系に連結すれば、回転
速度全域にわたつて常にエンジンの最大出力を取
出すことができる。 If the shaft end 21d of the valve rotation shaft 21 is connected to a motor unit or control system that varies the rotation angle in accordance with the rotation speed of the engine, it is possible to always obtain the maximum output of the engine over the entire rotation speed range. can.
更に、板状バルブ２２の焼損、破損時には前記
ねじ２５を抜き取り新しい板状バルブと交換して
ねじ２５止めすればよい。 Furthermore, in the event that the plate-shaped valve 22 is burnt out or damaged, the screw 25 may be removed, replaced with a new plate-shaped bulb, and the screw 25 may be secured.
発明の効果
この発明では、排気口に近接した排気通路上部
にバルブ回転軸を軸支すると共に、該軸に取付け
られた板状バルブの先端縁をシリンダ内面と略同
一の曲率を有するようにしたため、バルブ閉鎖動
作が連続的に可能となり低速運転時等における排
気の制御をエンジン性能が常に最適な状態に連続
して維持されるようにすることができると共に板
状バルブの先端縁がシリンダ内面に略沿つて移動
することからバルブ閉鎖が正確・迅速にできる。Effects of the Invention In this invention, the valve rotating shaft is pivotally supported at the upper part of the exhaust passage near the exhaust port, and the tip edge of the plate-shaped valve attached to the shaft is made to have approximately the same curvature as the inner surface of the cylinder. , the valve can be closed continuously, and the exhaust gas can be controlled during low-speed operation so that the engine performance can be continuously maintained at the optimum state at all times. Since the valve moves almost along the same direction, the valve can be closed accurately and quickly.
また、バルブの開放時におけるバルブ底面を排
気通路の上縁と略面一としたことから、高速運転
時におけるバルブの開放時に排気通路内に格別の
流通抵抗を生じさせるものがなく、排気の排出が
スムーズに行われて、バルブ装置が存在するにも
かかわらずこれが高速運転時の弊害にもならな
い、という利点を有することは勿論のこと、
バルブ装置はバルブ回転軸と板状バルブの２つ
の部品によつて構成し、バルブ回転軸に板状バル
ブを脱着可能に取付けたものであるから、各部品
毎に製造することができてその製造が極めて容易
であると共に製造コストの大幅な低減が図られる
ばかりでなく、板状バルブの焼損、破損時には板
状バルブのみを簡単に取り替え得るものであつて
その取り替えに多くの時間を要せず安価に取り替
えがなされるものである。 In addition, since the bottom of the valve is flush with the upper edge of the exhaust passage when the valve is opened, there is no flow resistance in the exhaust passage when the valve is opened during high-speed operation, and the exhaust gas is discharged. It has the advantage of being able to operate smoothly and not cause any problems during high-speed operation despite the presence of a valve device.The valve device has two parts: the valve rotation shaft and the plate valve. The plate valve is removably attached to the valve rotating shaft, so each part can be manufactured individually, making it extremely easy to manufacture and significantly reducing manufacturing costs. In addition, when the plate-shaped bulb is burnt out or damaged, only the plate-shaped bulb can be easily replaced, and the replacement does not require much time and can be done at low cost.
第１図はこの発明に係る実施例の縦断面図、第
２図はその−断面図、第３図は第２図の−
断面図を示す。
１……シリンダブロツク、４……排気口、５…
…排気通路、２１……バルブ回転軸、２２……板
状バルブ、２２ａ……先端縁。
FIG. 1 is a longitudinal cross-sectional view of an embodiment according to the present invention, FIG. 2 is a cross-sectional view thereof, and FIG. 3 is a cross-sectional view of FIG.
A cross-sectional view is shown. 1...Cylinder block, 4...Exhaust port, 5...
...Exhaust passage, 21...Valve rotating shaft, 22...Plate valve, 22a...Tip edge.
Claims (1)
軸を軸支すると共に、該軸に板状バルブを脱着可
能に取付け、該板状バルブの先端縁をシリンダ内
面と略同一の曲率を有するようにし、且つ該バル
ブの開放時におけるバルブ底面を排気通路の上縁
と略面一としたことを特徴とする２サイクルエン
ジンの排気バルブ装置。1. A valve rotating shaft is pivotally supported in the upper part of the exhaust passage near the exhaust port, and a plate-shaped valve is removably attached to the shaft, and the tip edge of the plate-shaped valve has approximately the same curvature as the inner surface of the cylinder. An exhaust valve device for a two-stroke engine, characterized in that the bottom surface of the valve is substantially flush with the upper edge of the exhaust passage when the valve is opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10071779A JPS5627014A (en) | 1979-08-09 | 1979-08-09 | Exhaust valve device of two-cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10071779A JPS5627014A (en) | 1979-08-09 | 1979-08-09 | Exhaust valve device of two-cycle engine |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17836087A Division JPS6325313A (en) | 1987-07-17 | 1987-07-17 | Exhaust valve device for two-cycle engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5627014A JPS5627014A (en) | 1981-03-16 |
| JPS6330485B2 true JPS6330485B2 (en) | 1988-06-17 |
Family
ID=14281391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10071779A Granted JPS5627014A (en) | 1979-08-09 | 1979-08-09 | Exhaust valve device of two-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5627014A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60219413A (en) * | 1984-04-16 | 1985-11-02 | Yamaha Motor Co Ltd | Blow-bye preventive device of two-cycle engine |
| DE3668348D1 (en) * | 1985-07-22 | 1990-02-22 | Honda Motor Co Ltd | DEVICE FOR CONTROLLING THE EXHAUST TIME OF AN INTERNAL COMBUSTION ENGINE. |
| JPS6229435U (en) * | 1985-08-07 | 1987-02-23 | ||
| EP0210829B1 (en) * | 1985-07-22 | 1989-11-02 | Honda Giken Kogyo Kabushiki Kaisha | Exhaust timing control apparatus |
| JPH0635832B2 (en) * | 1985-09-11 | 1994-05-11 | 本田技研工業株式会社 | Exhaust timing control device for 2-cycle engine |
| JPS62174514A (en) * | 1986-01-29 | 1987-07-31 | Honda Motor Co Ltd | Exhaust timing control device for two-cycle engine |
| JPS62267515A (en) * | 1986-05-14 | 1987-11-20 | Honda Motor Co Ltd | Exhaust timing control device for two-cycle engine |
| EP0246877A3 (en) * | 1986-05-20 | 1989-02-01 | Honda Giken Kogyo Kabushiki Kaisha | Exhaust timing control device for two-cycle engines |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5218333A (en) * | 1975-08-04 | 1977-02-10 | Canon Inc | Heating device |
| JPH0613299U (en) * | 1992-07-20 | 1994-02-18 | オンキヨー株式会社 | Speaker |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5139112U (en) * | 1974-09-17 | 1976-03-24 | ||
| JPS587060Y2 (en) * | 1975-06-20 | 1983-02-07 | ヤマハ発動機株式会社 | 2 Cycle Ninen Kikan |
-
1979
- 1979-08-09 JP JP10071779A patent/JPS5627014A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5218333A (en) * | 1975-08-04 | 1977-02-10 | Canon Inc | Heating device |
| JPH0613299U (en) * | 1992-07-20 | 1994-02-18 | オンキヨー株式会社 | Speaker |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5627014A (en) | 1981-03-16 |
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