JPH0361610A - Lead valve device for two-cycle engine - Google Patents

Lead valve device for two-cycle engine

Info

Publication number
JPH0361610A
JPH0361610A JP19434289A JP19434289A JPH0361610A JP H0361610 A JPH0361610 A JP H0361610A JP 19434289 A JP19434289 A JP 19434289A JP 19434289 A JP19434289 A JP 19434289A JP H0361610 A JPH0361610 A JP H0361610A
Authority
JP
Japan
Prior art keywords
valve
shape
reed valve
valve device
reed
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
Application number
JP19434289A
Other languages
Japanese (ja)
Other versions
JP2850384B2 (en
Inventor
Yoshinori Yokoi
横井　義則
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzuki Motor Corp
Original Assignee
Suzuki Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Suzuki Motor Corp filed Critical Suzuki Motor Corp
Priority to JP1194342A priority Critical patent/JP2850384B2/en
Publication of JPH0361610A publication Critical patent/JPH0361610A/en
Application granted granted Critical
Publication of JP2850384B2 publication Critical patent/JP2850384B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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

  • Check Valves (AREA)

Abstract

PURPOSE:To increase the opening area of a valve port without increasing the installation space by forming the valve ports on the outside surface and the intermediate recessed part side surface of a lead valve body whose sectional surface is formed into nearly M-figure shape. CONSTITUTION:As for the lead valve device 16, the intermediate part of a lead valve body 20 is formed into a recessed form having a V-figure shape or U-figure shape, and the sectional surface is formed into a nearly M-figure shape as a whole. A valve port 21 is formed on the outside surface of the lead valve body 20, and valve port 22 is formed also on the side surface of the recessed part, and the valve ports 21 and 22 are covered by the valve plates 23-26 as valve body which are installed into cantilever form. Further, each valve seat is formed on the periphery of the valve ports 21 and 22, and the opening/closing operation of the valve plates 23-26 is guided by the valve guides 27-30 which are curved smoothly. Therefore, the opening area of the lead valve device 16 can be increased without increasing the installation space, and the air intake resistance can be reduced.

Description

【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） この発明は、２サイクルエンジンのリードバルブ装置に
係り、特にエンジンクランクケースに取り付けられたリ
ードバルブ装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a reed valve device for a two-stroke engine, and particularly to a reed valve device attached to an engine crankcase.

（従来の技術） 自動２輪車に搭載される２サイクルエンジンでは、キャ
プレタからの混合気を直接クランク室に充填できるよう
にクランクケースにリードバルブ装置を装着している。(Prior Art) In a two-stroke engine mounted on a two-wheeled motor vehicle, a reed valve device is installed in the crankcase so that the air-fuel mixture from the capretor can be directly filled into the crank chamber.

このリードバルブ装置はピストンパルプのように吸気行
程において抵抗になるものがなく、混合気の高い充填効
率を確保でき、高回転域での高性能とハイレスポンスを
達成できることが知られている。It is known that this reed valve device has no resistance during the intake stroke like piston pulp, can ensure high air-fuel mixture filling efficiency, and can achieve high performance and high response in the high rotation range.

クランクケースに取り付けられる従来のリードバルブ装
置は、第７図に示すように構成され、リードバルブ本体
１を断面ほぼＶ形状に形成し、Ｖ字状外側面に弁ポート
２を形成し、この弁ポート２を開閉自在に覆うバルブプ
レート３を片持梁状に取り付けている。バルブプレート
３の開閉動作はバルブガイド４により案内されるように
なっている。A conventional reed valve device attached to a crankcase is constructed as shown in FIG. A valve plate 3 that covers the port 2 so as to be openable and closable is attached in a cantilever shape. The opening and closing operations of the valve plate 3 are guided by a valve guide 4.

（発明が解決しようとする課題） 従来のリードバルブ装置は■型リードバルブ本体１の外
側面に弁ポート２を形成し、この弁ポ−ト２をバルブプ
レート３で開閉自在に覆うようになっているため、弁ポ
ート２の開口面積を大きくとろうとすると、インテーク
長さが長くなり、取付スペースが増大し、混合気の一次
圧が低下することがあった。(Problems to be Solved by the Invention) A conventional reed valve device has a valve port 2 formed on the outer surface of a ■-type reed valve body 1, and this valve port 2 is covered with a valve plate 3 so as to be openable and closable. Therefore, if an attempt is made to increase the opening area of the valve port 2, the intake length becomes longer, the installation space increases, and the primary pressure of the air-fuel mixture sometimes decreases.

また、同じ取付スペース内で弁ポートの開口面積を増大
させ、吸気抵抗を減少させることに限界があり、より一
層のエンジン出力向上を図る上で問題があった。Furthermore, there is a limit to increasing the opening area of the valve port and reducing intake resistance within the same installation space, which poses a problem in further improving engine output.

この発明は上述した事情を考慮してなされたもので、イ
ンテーク長を長くしたり、取付スペースを増大させるこ
となく、弁ポートの開口面積を大きくシ、吸気抵抗を減
少させて出力の向上を図れるようにした２サイクルエン
ジンのリードバルブ装置を提供することを目的とする。This invention was made in consideration of the above-mentioned circumstances, and it is possible to increase the opening area of the valve port, reduce intake resistance, and improve output without increasing the intake length or installation space. An object of the present invention is to provide a reed valve device for a two-stroke engine.

〔発明の構成〕[Structure of the invention]

（課題を解決するための手段） この発明は、従来技術が有する課題を解決するために、
外側面に弁ポートを形成したリードバルブ本体の中間部
をＶ形状あるいはＵ形状に凹ませて断面ほぼＭ形状に形
成し、上記凹部の側面に弁ポートをそれぞれ形成し、前
記各弁ポートをバルブプレートで開閉自在に覆うととも
に、上記バルブプレートの開閉をバルブガイドで案内し
たものである。(Means for Solving the Problems) In order to solve the problems of the prior art, the present invention has the following features:
The middle part of the reed valve main body, which has valve ports formed on its outer surface, is recessed into a V-shape or a U-shape to form an approximately M-shape in cross section, and valve ports are formed on the side surfaces of the recess, and each of the valve ports is connected to the valve body. It is covered with a plate that can be opened and closed freely, and a valve guide guides the opening and closing of the valve plate.

（作用） この２サイクルエンジンのリードバルブ装置は、リード
バルブ本体の中間部をＶ形状あるいはＵ形状に凹ませて
断面ほぼＭ形状に形成し、上記凹部の側面にも弁ボート
を形成してリードバルブ装置の開口面積を増大させ、吸
気抵抗を大幅に減少させたものであり、これにより、２
サイクルエンジンのエンジン出力の向上を図ることがで
きる。(Function) This reed valve device for a two-stroke engine has a reed valve main body whose middle part is recessed in a V-shape or a U-shape to form an approximately M-shape in cross section, and a valve boat is also formed on the side of the recess to lead the reed valve. The opening area of the valve device has been increased to significantly reduce intake resistance.
It is possible to improve the engine output of a cycle engine.

（実施例） この発明に係る２サイクルエンジンのリードバルブ装置
の一実施例について説明する。(Example) An example of a reed valve device for a two-stroke engine according to the present invention will be described.

第２図は、２サイクルエンジン１０を搭載した例えばレ
ーシング用あるいはモトクロス用自動２輪車１１を示す
。この自動２輪車１１は、２サイクルエンジンＩＯの吸
気側にエアクリーナ１２およびキャプレタ１３が設けら
れ、エンジン吸気系を構成している。FIG. 2 shows a motorcycle 11 for racing or motocross, for example, which is equipped with a two-stroke engine 10. This two-wheeled motor vehicle 11 is provided with an air cleaner 12 and a capretor 13 on the intake side of a two-stroke engine IO, forming an engine intake system.

２サイクルエンジン１０のクランクケース１４内には、
キャブレタ１３からの混合気を直接クランク室１５に充
填させるリードバルブ装置１６が設置される。このリー
ドバルブ装置１６は第３図に示すように、エンジン吸気
系の吸気通路１７を横断するように取り付けられる。Inside the crankcase 14 of the two-stroke engine 10,
A reed valve device 16 is installed to directly fill the crank chamber 15 with the air-fuel mixture from the carburetor 13. As shown in FIG. 3, this reed valve device 16 is installed so as to cross an intake passage 17 of an engine intake system.

リードバルブ装置１６は、第１図に示すように、リード
バルブ本体２０の中間部がＶ形状あるいはＵ形状に凹設
され、全体として断面ほぼＭ形状に形成される。リード
バルブ本体２０の外側面には、例えば片側に４葉ずつ８
葉の弁ポート２１が形成される一方、前記凹部の側面に
も両側に例えば８葉の弁ポー）２２．２２が形成され、
各弁ポート２１；２２は片持梁状に取り付けられた弁体
としてのバルブプレー）２３．　２４°；２５，２６に
より覆われている。各弁ポート２１．２２の葉数は上述
したものに限定されず、種々の変形が可能である。弁ポ
ート２１；２２の周りにはバルブシートが形成される一
方、バルブプレート２３，２４；２５．２６の開閉動作
は滑かに湾曲した片持梁状のバルブガイド２７，２８；
２９．ａｏにより案内され、バルブプレート２３〜２６
の折損等が防止される。As shown in FIG. 1, the reed valve device 16 has a reed valve main body 20 having a recessed middle portion in a V shape or a U shape, and the reed valve device 16 as a whole is formed in a substantially M shape in cross section. On the outer surface of the reed valve body 20, there are, for example, 8 leaves, 4 on each side.
While a leaflet valve port 21 is formed, for example, eight leaflet valve ports 22, 22 are formed on both sides of the recess,
Each valve port 21; 22 is a valve plate as a cantilever-mounted valve body)23. 24°; covered by 25, 26. The number of leaves in each valve port 21, 22 is not limited to the above-mentioned number, and various modifications are possible. A valve seat is formed around the valve ports 21; 22, while the opening and closing operations of the valve plates 23, 24; 25, 26 are controlled by smoothly curved cantilever-shaped valve guides 27, 28;
29. guided by ao, valve plates 23-26
This prevents breakage, etc.

その際、リードバルブ本体２０の両性側面に取り付けら
れるパルププレー）２４，２４と中間凹部に取り付けら
れるパルププレー）２５，２６は弁の長さを異にし、開
閉タイミングや固有振動数をそれぞれ変えることができ
る。なお、リードバルブ本体２０の中間凹部に形成され
るバルブガイド２９．３０は一体構造物としても、胴体
構造物であってもよい。In this case, the pulp plates (24, 24, attached to both sides of the reed valve body 20) and the pulp plates (25, 26), attached to the intermediate recess, have different valve lengths, and the opening/closing timing and natural frequency can be changed respectively. I can do it. Note that the valve guides 29 and 30 formed in the intermediate recessed portion of the reed valve body 20 may be an integral structure or a body structure.

次に、この発明の詳細な説明する。Next, the present invention will be explained in detail.

この２サイクルエンジンにおいては、第４図に示すよう
に、エアクリーナ１２を通った空気は、キャプレタ１３
で燃料と混合せしめられて混合気となり、この混合気は
インテークパイプ３１によりリードバルブ装置１６を通
り、エンジンクランク室１５に吸入される。なお、第４
ｖｉ！Ｊにおいて、符号３２はサスペンションであり、
この場合のサスペンション３２はリードバルブ装置１６
に近接した位置に取り付けられた例を示している。In this two-stroke engine, as shown in FIG.
The air-fuel mixture is mixed with fuel to form an air-fuel mixture, which is sucked into the engine crank chamber 15 through the intake pipe 31 and the reed valve device 16 . In addition, the fourth
vi! In J, numeral 32 is a suspension;
The suspension 32 in this case is the reed valve device 16
An example is shown in which the device is installed in a location close to.

その際、リードバルブ装置１６は、リードバルブ本体２
０を断面Ｍ形状に形威し、外側面および中間凹部の側面
にそれぞれ弁ポート２１．２２を形成したので、取付ス
ペースを増大させなくても、リードバルブ装置１６の開
口面積を大きくとることができ、吸気抵抗を小さくるす
ことができる。At that time, the reed valve device 16
Since the reed valve device 16 has an M-shaped cross section and valve ports 21 and 22 are formed on the outer surface and the side surface of the intermediate recess, the opening area of the reed valve device 16 can be increased without increasing the installation space. It is possible to reduce the intake resistance.

また、リードバルブ装置１６はリードバルブ本体２０を
断面Ｍ形状とすることにより、リードバルブのインテー
ク長さを小さくすることができる。Moreover, the reed valve device 16 can reduce the intake length of the reed valve by making the reed valve main body 20 M-shaped in cross section.

リードバルブ装置１６をこのようなレイアウト構造とす
ることにより、リードバルブ本体２０の外側面に取り付
けられるバルブで現状のリードバルブの弁機能を発揮さ
せることができ、かつ中間凹部に取り付けられるバルブ
で固有振動数を変えることができ、２サイクルエンジン
は力強い高速パワーと安定した低速パワーを得ることが
できる。By making the reed valve device 16 have such a layout structure, the valve installed on the outer surface of the reed valve body 20 can perform the valve function of the current reed valve, and the valve installed in the intermediate recess can perform the valve function uniquely. By changing the vibration frequency, the 2-cycle engine can provide powerful high-speed power and stable low-speed power.

なお、この発明の一実施例においては、リードバルブ装
置はリードバルブ本体の中間部にＶ字状凹部を形成した
断面ほぼＭ形状に形成した例を示したが、第６図に示す
ようにリードバルブ装置１６Ａはリードバルブ本体２０
Ａの中間部にＵ字状凹部を形成して断面ほぼＭ形状とし
てもよく、さらに、深いＶ字状となるように大きく凹ま
せてＷ形状に近いＭ断面形状にリードバルブ本体を構成
してもよい。In one embodiment of the present invention, the reed valve device has an approximately M-shaped cross section with a V-shaped recess formed in the middle part of the reed valve body, but as shown in FIG. The valve device 16A is a reed valve body 20
A U-shaped recess may be formed in the middle part of A to give the reed valve a substantially M-shaped cross section, and the reed valve body may also be formed into a deep V-shaped recess to have an M cross-sectional shape close to a W-shape. Good too.

〔発明の効果〕〔Effect of the invention〕

以上に述べたようにこの発明に係る２サイクルエンジン
のリードバルブ装置においては、外側面に弁ポートを形
成したリードバルブ本体の中間部をＶ形状あるいはＵ形
状に凹ませて断面ほぼＭ形状に形成し、上記凹部の側面
に弁ポートをそれぞれ形成し、前記各弁ポートをバルブ
プレートで開閉自在に覆うとともに、上記バルブプレー
トの開閉をバルブガイドで案内したので、リードバルブ
の開口面積を大きくとることができ、インテーク長さを
長くしたり、取付スペースを増大させることなく、吸気
抵抗を小さくすることができ、エンジンの出力向上を図
ることができる。As described above, in the reed valve device for a two-stroke engine according to the present invention, the intermediate portion of the reed valve body, which has a valve port formed on the outer surface, is recessed in a V shape or a U shape to have an approximately M shape in cross section. In addition, valve ports are formed on the side surfaces of the recessed portions, each of the valve ports is covered with a valve plate so as to be openable and closable, and the opening and closing of the valve plate is guided by a valve guide, so that the opening area of the reed valve can be increased. This makes it possible to reduce intake resistance and improve engine output without increasing the intake length or installation space.

【図面の簡単な説明】[Brief explanation of drawings]

第１図はこの発明に係る２サイクルエンジンのリードバ
ルブ装置の一実施例を示す斜視図、第２図は上記リード
バルブ装置を備えた自動２輪車の全体図、第３図は前記
リードバルブ装置を搭載した２サイクルエンジンを示す
断面図、第４図はレーシングやモトクロス用２サイクル
エンジンの吸気系のレイアウト図、第５図はこの発明の
２サイクルエンジンのリードバルブ装置の側断面図、第
６図はこの発明の他の実施例を示す側断面図、第７図は
従来の２サイクルエンジンのリードバルブ装置を示す全
体斜視図である。 １０・・・２サイクルエンジン、１２・・・エアクリー
ナ、１３・・・キャプレタ、１４・・・クランクケース
、１５・・・クランク室、１６・・・リードバルブ装置
、２０・・・リードバルブ本体、２１．２２・・・弁ポ
ート、２３〜２６・・・バルブプレート（弁体）、２７
〜３０・・・バルブガイド。 第 を 図 第４図 第 ３ 図 第 図FIG. 1 is a perspective view showing an embodiment of a reed valve device for a two-stroke engine according to the present invention, FIG. 2 is an overall view of a two-wheeled motor vehicle equipped with the reed valve device, and FIG. 4 is a layout diagram of the intake system of a 2-stroke engine for racing and motocross; FIG. 5 is a side sectional view of the reed valve device for a 2-stroke engine of the present invention; FIG. 6 is a side sectional view showing another embodiment of the present invention, and FIG. 7 is an overall perspective view showing a conventional reed valve device for a two-stroke engine. DESCRIPTION OF SYMBOLS 10... Two-stroke engine, 12... Air cleaner, 13... Capretor, 14... Crank case, 15... Crank chamber, 16... Reed valve device, 20... Reed valve body, 21.22...Valve port, 23-26...Valve plate (valve body), 27
~30... Valve guide. Figure 4 Figure 3 Figure 3

Claims (1)

【特許請求の範囲】[Claims] 外側面に弁ポートを形成したリードバルブ本体の中間部
をＶ形状あるいはＵ形状に凹ませて断面ほぼＭ形状に形
成し、上記凹部の側面に弁ポートをそれぞれ形成し、前
記各弁ポートをバルブプレートで開閉自在に覆うととも
に、上記バルブプレートの開閉をバルブガイドで案内し
たことを特徴とする２サイクルエンジンのリードバルブ
装置。The middle part of the reed valve main body, which has valve ports formed on its outer surface, is recessed into a V-shape or a U-shape to form an approximately M-shape in cross section, and valve ports are formed on the side surfaces of the recess, and each of the valve ports is connected to the valve body. A reed valve device for a two-stroke engine, characterized in that the reed valve device is covered with a plate so as to be openable and closable, and the opening and closing of the valve plate is guided by a valve guide.
JP1194342A 1989-07-28 1989-07-28 Reed valve device for two-cycle engine Expired - Fee Related JP2850384B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1194342A JP2850384B2 (en) 1989-07-28 1989-07-28 Reed valve device for two-cycle engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1194342A JP2850384B2 (en) 1989-07-28 1989-07-28 Reed valve device for two-cycle engine

Publications (2)

Publication Number Publication Date
JPH0361610A true JPH0361610A (en) 1991-03-18
JP2850384B2 JP2850384B2 (en) 1999-01-27

Family

ID=16322994

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1194342A Expired - Fee Related JP2850384B2 (en) 1989-07-28 1989-07-28 Reed valve device for two-cycle engine

Country Status (1)

Country Link
JP (1) JP2850384B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7028649B1 (en) 2004-03-04 2006-04-18 Polaris Industries Inc. High flow reed valve assembly for a two-cycle engine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57119127A (en) * 1972-08-22 1982-07-24 Performance Industries 2-cycle crankcase compression type internal combustion engine
JPS63164674U (en) * 1987-04-15 1988-10-26

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57119127A (en) * 1972-08-22 1982-07-24 Performance Industries 2-cycle crankcase compression type internal combustion engine
JPS63164674U (en) * 1987-04-15 1988-10-26

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7028649B1 (en) 2004-03-04 2006-04-18 Polaris Industries Inc. High flow reed valve assembly for a two-cycle engine

Also Published As

Publication number Publication date
JP2850384B2 (en) 1999-01-27

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