JPH0466729A - Two-four cycle switchable engine - Google Patents

Two-four cycle switchable engine

Info

Publication number
JPH0466729A
JPH0466729A JP17932790A JP17932790A JPH0466729A JP H0466729 A JPH0466729 A JP H0466729A JP 17932790 A JP17932790 A JP 17932790A JP 17932790 A JP17932790 A JP 17932790A JP H0466729 A JPH0466729 A JP H0466729A
Authority
JP
Japan
Prior art keywords
slide valve
cycle
engine
switching engine
air
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
Application number
JP17932790A
Other languages
Japanese (ja)
Inventor
Hideo Kawamura
英男 河村
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.)
Isuzu Ceramics Research Institute Co Ltd
Original Assignee
Isuzu Ceramics Research Institute Co Ltd
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 Isuzu Ceramics Research Institute Co Ltd filed Critical Isuzu Ceramics Research Institute Co Ltd
Priority to JP17932790A priority Critical patent/JPH0466729A/en
Publication of JPH0466729A publication Critical patent/JPH0466729A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/18—Other cylinders
    • F02F1/22—Other cylinders characterised by having ports in cylinder wall for scavenging or charging
    • 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
    • F02B69/00—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types
    • F02B69/06—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different cycles, e.g. convertible from two-stroke to four stroke
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

PURPOSE:To increase the response and the reliability when the 2-cycle operation or the 4-cycle operation is converted, by maintaining the condition to block the suction port of a slide valve constantly with a spring, or opening the suction port by applying an air pressure to the end surface to drive the slide valve. CONSTITUTION:In a low speed and a high load condition of this engine, for example, a controller 8 opens an electromagnetic valve 42 so as to open an air chamber 33 to the outside as well as feeding the compressed air from a pressure tank 41 to an air chamber 32. As a result, two slide valves 3 are moved in the direction to contract the air chamber 33 against the extension force of a spring 34 by the pressure in the air chamber 32. And when the slide valves 3 are stopped, suction ports 12 and windows 31 are made coincident, and thereby, the suction air compressed by a turbocharger 7 is fed from the suction ports 12 to a combustion chamber. Consequently, the engine now operates as a uniflow type 2-cycle engine.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、エンジンの回転数及び負荷の変換に応じて２
サイクル運転と４サイクル運転とを切換える２−４サイ
クル切換エンジンに関する。Detailed Description of the Invention (Industrial Field of Application) The present invention provides two
The present invention relates to a 2-4 cycle switching engine that switches between cycle operation and 4-cycle operation.

（従来の技術） 従来のピストン往復式エンジンは、ピストンの１往復、
すなわちクランク軸１回転にて吸入、圧縮、爆発、排気
の行程を行う２サイクルエンジンと、ピストンの２往復
、すなわちクランク軸２回転の間に前記の４行程を行う
４サイクルエンジンとに大別される。(Prior art) A conventional piston reciprocating engine has one reciprocation of the piston,
In other words, they are broadly divided into two-cycle engines, which carry out the suction, compression, explosion, and exhaust strokes in one revolution of the crankshaft, and four-cycle engines, which carry out the four strokes in two reciprocations of the piston, that is, two revolutions of the crankshaft. Ru.

そして、２サイクルエンジンではシリンダスリーブの下
方に吸気ボート（吸気口）を配置し、ピストンの下降時
に圧送された空気により、吸入と排気とを同時に平行し
て行い、クランク軸の１回転毎に爆発が行われるため、
出力軸の回転変動が少なく、高トルクを発生ずることが
できる。In a 2-stroke engine, an intake boat (intake port) is placed below the cylinder sleeve, and the air pumped in when the piston descends causes intake and exhaust to occur simultaneously in parallel, causing an explosion to occur with each rotation of the crankshaft. is carried out,
There is little rotational fluctuation of the output shaft, and high torque can be generated.

一方、４サイクルエンジンでは、吸入と排気とがそれぞ
れ独立した行程にて行われるので、充分にガス交換され
るため２サイクルエンジンに比して低負荷低速運転時に
おける排気ガスが清浄であり、特にエンジン回転速度が
高速時における燃料消費率が少ないという利点がある。On the other hand, in a 4-stroke engine, intake and exhaust are performed in separate strokes, so gas is exchanged sufficiently, so the exhaust gas is cleaner during low-load, low-speed operation compared to a 2-stroke engine, especially when operating at low load and low speed. This has the advantage that the fuel consumption rate is low when the engine rotation speed is high.

ところで、一つのエンジンを２サイクル運転または４サ
イクル運転に自在に変化させてそれぞれの特性に適合し
た運転を行う場合、上述のように２サイクル運転時に使
用する吸気ボートを有するため、４サイクル運転の際は
ピストン下降時にシリンダの内外が連通することになり
、エンジンの運転に支障をきたすという問題が生じる。By the way, when one engine is freely changed to 2-cycle operation or 4-cycle operation to suit the characteristics of each engine, as mentioned above, there is an intake boat used during 2-cycle operation, so the 4-cycle operation In this case, when the piston descends, the inside and outside of the cylinder will communicate with each other, causing a problem in which the operation of the engine will be hindered.

そこで本願出願人は、シリンダスリーブの外周面に該吸
気ボートを開閉するスリーブ弁を設け、該スリーブ弁を
リンク等の機構を介して電磁ソレノイドにより駆動し、
該吸気ボートを必要に応じ開閉するサイクル可変エンジ
ンを、特願平１−１１２５０７号として既に出願した。Therefore, the applicant provided a sleeve valve for opening and closing the intake boat on the outer peripheral surface of the cylinder sleeve, and drove the sleeve valve by an electromagnetic solenoid via a mechanism such as a link.
A variable cycle engine that opens and closes the intake boat as required has already been filed as Japanese Patent Application No. 1-112507.

また、上記スリーブ弁に永久磁石を連結し、該永久磁石
を固定電磁石により吸引反発させ、スリーブ弁を駆動す
るサイクル可変エンジンを、特願平１−３２２４２５号
として既に出願した。In addition, a variable cycle engine in which a permanent magnet is connected to the sleeve valve and the permanent magnet is attracted and repelled by a fixed electromagnet to drive the sleeve valve has already been filed as Japanese Patent Application No. 1-322425.

（発明が解決しようとする課題） しかし、上記のようにスリーブ弁をリンク等の機構を介
してｔｌｉＨソレノイドにより駆動する場合には、駆動
装置が複雑となり、また駆動機構の完成や稼動部のガタ
のため応答速度が遅いという問題がある。(Problems to be Solved by the Invention) However, when the sleeve valve is driven by the tliH solenoid via a mechanism such as a link as described above, the drive device becomes complicated, and there is a problem in the completion of the drive mechanism and the looseness of the moving parts. Therefore, there is a problem that the response speed is slow.

また、スリーブ弁に永久磁石を連結したものでは、エン
ジンから伝達される熱により該永久磁石が減磁し上記吸
気ボートの開閉制御が不能になるおそれがあるという問
題がある。Further, in the case where a permanent magnet is connected to the sleeve valve, there is a problem in that the permanent magnet is demagnetized by the heat transferred from the engine, making it impossible to control the opening and closing of the intake boat.

本発明はこのような問題に鑑みてなされたものであり、
その目的はエンジンの回転速度及び負荷の変化に応じて
２サイクル運転または４サイクル運転を切換える際の応
答が俊敏で、かつ高信頼性を有する２−４サイクル切換
エンジンを提供することにある。The present invention was made in view of such problems,
The purpose is to provide a 2-4 cycle switching engine that has quick response when switching between 2-cycle operation and 4-cycle operation in response to changes in engine speed and load, and has high reliability.

（課題を解決するための手段） 本発明によれば、エンジンの運転状態に応じて２サイク
ル作動と４サイクル作動との選択が自在であり、２サイ
クル作動時にはシリンダの下部に設けられた吸入口から
吸気を行なう２−４サイクル切換エンジンにおいて、上
記シリンダの外周部に設けられ上記吸入口を閉塞開放自
在にするスライドバルブと、上記スライドバルブにて吸
入口を閉塞する方向に該スライドバルブをバイアスする
バイアス手段と、２サイクル作動時に上記バイアス手段
のバイアス力に抗してスライドバルブを吸入口開放方向
に駆動する空気圧利用のスライドバルブ駆動手段とを有
することを特徴とする２−４サイクル切換エンジンを提
供できる。(Means for Solving the Problems) According to the present invention, it is possible to freely select between 2-cycle operation and 4-cycle operation according to the operating state of the engine, and during 2-cycle operation, the intake port provided at the bottom of the cylinder In a 2-4 cycle switching engine that takes air from the cylinder, a slide valve is provided on the outer periphery of the cylinder to freely close and open the intake port, and the slide valve is biased in a direction to close the intake port. and a slide valve drive means using pneumatic pressure that drives the slide valve in the direction of opening the intake port against the bias force of the bias means during two-cycle operation. can be provided.

（作用） 本発明の２−４サイクル切換エンジンでは、スライドバ
ルブをスプリングにより常時吸入口が閉鎖する状態で保
持し、２サイクル運転時には該スライドバルブの端面に
空気圧を作用させ、該スライドバルブを駆動し吸入口を
開放する。(Function) In the 2-4 cycle switching engine of the present invention, the slide valve is held in a state in which the intake port is always closed by a spring, and during 2-cycle operation, air pressure is applied to the end face of the slide valve to drive the slide valve. and open the inlet.

（実施例） 以下、本発明の実施例を図面に従って詳細に説明する。(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

第１図は、本発明によりエンジンの断面図である。また
、第２図は、■−■断面図である。尚、第１図は第２図
におけるＩ−Ｉ断面図に相当するものである。FIG. 1 is a cross-sectional view of an engine according to the present invention. Moreover, FIG. 2 is a cross-sectional view taken along the line ■-■. Note that FIG. 1 corresponds to the II sectional view in FIG. 2.

１はエンジン本体であり、該エンジン本体１の内部には
シリンダスリーブ１１が嵌合されている。該シリンダス
リーブ１１の下部には、該エンジンが２サイクル作動す
る際に燃焼室内に吸気を導入する吸入口１２が貫設され
ている。そして、上記エンジン本体１の吸入口１２に対
応する位置には、該吸入口１２へ吸気を導く吸気管１３
が設けられている。上記エンジン本体１には更に、シリ
ンダヘッド部に燃焼室へ吸気を導く吸気管路１４と燃焼
室からの排気ガスを外部へ導く排気管路１５とが設けら
れている。1 is an engine body, and a cylinder sleeve 11 is fitted inside the engine body 1. An intake port 12 is provided in the lower part of the cylinder sleeve 11 to introduce intake air into the combustion chamber when the engine operates in two cycles. At a position corresponding to the intake port 12 of the engine body 1, there is an intake pipe 13 that guides intake air to the intake port 12.
is provided. The engine body 1 is further provided with an intake pipe 14 that guides intake air into the combustion chamber and an exhaust pipe 15 that guides exhaust gas from the combustion chamber to the outside in the cylinder head.

２は、上記シリンダスリーブ１１の内部を往復するピス
トンである。第１図は、該ピストン２が上死点近傍位置
にある状態を示しており、該ピストン２の側面によって
上記吸入口１２は閉鎖されているが、該ピストン２が下
死点まで移動すると吸入口１２は燃焼室側に露出し開口
することになる。2 is a piston that reciprocates inside the cylinder sleeve 11. FIG. 1 shows a state in which the piston 2 is near the top dead center, and the suction port 12 is closed by the side surface of the piston 2, but when the piston 2 moves to the bottom dead center, the suction port 12 is closed. The mouth 12 is exposed and opened toward the combustion chamber side.

３は、上記シリンダスリーブ１１の外周面に沿って湾曲
した帯状のスライドバルブであり、シリンダスリーブ１
１の外周に摺動自在に２個配設されている。該スライド
バルブ３は窒化珪素等のセラミック焼結体のように耐熱
性に優れ、変形がなく、かつ軽量である材料で形成され
ており、上記吸入口１２と同一ピッチで窓部３１が貫設
されている。3 is a band-shaped slide valve curved along the outer peripheral surface of the cylinder sleeve 11;
Two pieces are slidably arranged on the outer periphery of 1. The slide valve 3 is made of a material that has excellent heat resistance, does not deform, and is lightweight, such as a ceramic sintered body such as silicon nitride, and has window portions 31 extending through it at the same pitch as the suction port 12. has been done.

該２個のスライドバルブ３は互いの間に気室３２と気室
３３とを形成し、該気室３３には該気室３３を拡張する
方向、すなわち気室３２を減縮する方向に上記スライド
バルブ３を付勢するスプリング３４が配設されている。The two slide valves 3 form an air chamber 32 and an air chamber 33 between them. A spring 34 is provided to bias the valve 3.

そして、上記エンジン本体１には該気室３２と連通する
送気管３５と、気室３３と連通ずる送気管３６とが設け
られている。The engine body 1 is provided with an air pipe 35 communicating with the air chamber 32 and an air pipe 36 communicating with the air chamber 33.

そして、上記送気管３５には、外部からの信号により上
記気室３２に圧縮空気を供給し、また該気室３２を外部
に対して開放する圧力タンク４１が接続されている。A pressure tank 41 is connected to the air supply pipe 35 for supplying compressed air to the air chamber 32 in response to a signal from the outside and for opening the air chamber 32 to the outside.

また、上記送気管３６には外部からの信号により上記気
室３３を外部に対して開放する電磁バルブ４２が接続さ
れている。Further, an electromagnetic valve 42 is connected to the air supply pipe 36, which opens the air chamber 33 to the outside in response to an external signal.

５は、上記吸気管路１４と燃焼室との間に配設された吸
気バルブであり、該吸気バルブ５は外部からの信号によ
り該吸気バルブ５を自在に開閉駆動する吸・気バルブ駆
動装置５１に連結されている。Reference numeral 5 denotes an intake valve disposed between the intake pipe line 14 and the combustion chamber, and the intake valve 5 is provided with an intake/air valve driving device that freely opens and closes the intake valve 5 based on external signals. 51.

６は、上記排気管路１５と燃焼室との間に配設された排
気バルブであり、該排気バルブ６は外部からの信号によ
り該排気バルブ６を自在に開閉駆動する排気バルブ駆動
装置６１に連結されている。Reference numeral 6 denotes an exhaust valve disposed between the exhaust pipe line 15 and the combustion chamber, and the exhaust valve 6 is driven by an exhaust valve driving device 61 that freely opens and closes the exhaust valve 6 based on an external signal. connected.

尚、上記吸気バルブ駆動装置５１及び排気バルブ駆動装
置６１は共に、吸気バルブ５及び排気バルブ６に連結さ
れた磁性体を固定電磁石にて吸弓あるいは排斥して各バ
ルブを駆動するものであり、例えば特願昭６３−３３４
９６０号等に記載されているものと同様の構成を有して
いる。Note that both the intake valve driving device 51 and the exhaust valve driving device 61 drive each valve by sucking or repelling a magnetic body connected to the intake valve 5 and the exhaust valve 6 using a fixed electromagnet. For example, patent application 1986-334
It has the same configuration as that described in No. 960 and the like.

７は、ターボチャージャであり、上記排気管路１５から
の排気ガスにより駆動されるタービン７２と、該タービ
ン７２の回転力により吸気を圧縮し上記吸気管１３及び
吸気管路１４に供給するコンプレッサ７１と、該コンプ
レッサ７１とタービン７２を連結する回転軸に配設され
た回転電機７３とを有している。また、該回転電機７３
はインバータ／コンバータ７４が接続されており、外部
からの信号により電動機として、あるいは発電機として
作動する。Reference numeral 7 denotes a turbocharger, which includes a turbine 72 driven by exhaust gas from the exhaust pipe 15, and a compressor 71 which compresses intake air by the rotational force of the turbine 72 and supplies it to the intake pipe 13 and the intake pipe 14. and a rotating electrical machine 73 disposed on a rotating shaft that connects the compressor 71 and the turbine 72. In addition, the rotating electric machine 73
is connected to an inverter/converter 74, and operates as an electric motor or a generator depending on an external signal.

８はコントローラであり、上記圧力タンク４１、電磁バ
ルブ４２、吸気バルブ駆動装置５１、排気バルブ駆動装
置６１、インバータ／コンバータ７４に連結し、これら
に対して制御信号を出力する。A controller 8 is connected to the pressure tank 41, electromagnetic valve 42, intake valve drive device 51, exhaust valve drive device 61, and inverter/converter 74, and outputs control signals to these.

尚、該コントローラ８はマイクロコンピュータからなり
、演算処理を行う中央制御装置、演算処理手順や制御手
順などを格納する各種メモリ、入／出力ボートなどを備
えている。The controller 8 is composed of a microcomputer, and includes a central control unit for performing arithmetic processing, various memories for storing arithmetic processing procedures, control procedures, etc., an input/output board, and the like.

次に、上記構成によるエンジンの作動について説明する
。Next, the operation of the engine with the above configuration will be explained.

第３図は、スライドバルブの作動を示す斜視図である。FIG. 3 is a perspective view showing the operation of the slide valve.

エンジンの回転速度が所定速度以下で、かつエンジンへ
の負荷が所定値以上の場合、すなわち低速高負荷状態の
場合には、上記コントローラ８はエンジンを２サイクル
作動させるため、吸気バルブ駆動装置５１の作動を停止
させ吸気バルブ５を閉鎖状態にて保持すると共に、排気
バルブ駆動装置６１を制御し排気バルブを１回転毎に開
放する。When the rotational speed of the engine is below a predetermined speed and the load on the engine is above a predetermined value, that is, when the engine is in a low speed and high load state, the controller 8 operates the intake valve drive device 51 in order to operate the engine for two cycles. The operation is stopped and the intake valve 5 is held in a closed state, and the exhaust valve driving device 61 is controlled to open the exhaust valve every rotation.

更にコントローラ８は、第３図のＡにて示す圧力タンク
４１からの圧縮空気を気室３２に供給する。また、ｉ磁
バルブ４２を開放し気室３３を外部に対して開放する。Furthermore, the controller 8 supplies compressed air from the pressure tank 41 shown at A in FIG. 3 to the air chamber 32. Further, the i-magnetic valve 42 is opened to open the air chamber 33 to the outside.

すると、気室３２内部の圧力により２個のスライドバル
ブ３はスプリング３４の拡張力に抗して気室３３を減縮
する方向に移動する。このとき気室３３内部の空気は第
３図のＢに示すように排出される。Then, due to the pressure inside the air chamber 32, the two slide valves 3 move in a direction to contract the air chamber 33 against the expansion force of the spring 34. At this time, the air inside the air chamber 33 is exhausted as shown at B in FIG.

そして、スライドバルブ３が停止すると吸入口１２と窓
部３１とが一致するためターボチャージャ７によって圧
縮された吸気は、該吸入口１２から燃焼室へと供給され
る。Then, when the slide valve 3 stops, the intake port 12 and the window 31 coincide with each other, so that the intake air compressed by the turbocharger 7 is supplied from the intake port 12 to the combustion chamber.

よって、本エンジンはユニフロー式の２サイクルエンジ
ンとして作動することになる。Therefore, this engine operates as a uniflow two-stroke engine.

次に、エンジンの運転状態が低速低負荷時もしくは高速
時には、圧力タンク４１から気室３２への圧縮空気の供
給を停止し該気室３２を外部に開放する。すると、スプ
リング３４の拡張力によりスライドバルブ３を摺動させ
吸入口１２と窓部３１とが一致しない状態にし、吸入口
１２を閉鎖する。そして、上記吸気バルブ駆動装置５１
と排気バルブ駆動装置６１とにより通常の４サイクル作
動を行う。Next, when the engine is operating at low speed and low load or at high speed, the supply of compressed air from the pressure tank 41 to the air chamber 32 is stopped and the air chamber 32 is opened to the outside. Then, the expansion force of the spring 34 causes the slide valve 3 to slide so that the suction port 12 and the window portion 31 do not coincide with each other, thereby closing the suction port 12. Then, the intake valve drive device 51
and exhaust valve drive device 61 to perform normal four-cycle operation.

尚、上記回転電機７３は、急加速時等、エンジンに高出
力が要求される際には電動機として作動し過給作動を付
勢すると共に、高速運転時等の場合には発電機として作
動し、排気ガスの熱エネルギを電気エネルギに変換して
回収する。The rotating electrical machine 73 operates as an electric motor to energize supercharging operation when high output is required from the engine, such as during sudden acceleration, and operates as a generator during high-speed operation. , converts and recovers the thermal energy of exhaust gas into electrical energy.

上記において、本発明の実施例について詳細に説明した
が、本発明の精神から逸れないかぎりで、種々の異なる
実施例は容易に構成できるから、本発明は上記特許請求
の範囲において記載した限定以外、特定の実施例に制約
されるのものではない。Although the embodiments of the present invention have been described in detail above, various different embodiments can be easily constructed without departing from the spirit of the invention, and therefore, the present invention is not limited to any limitations other than those set forth in the claims. , and is not limited to any particular implementation.

（発明の効果） 以上説明したように、本発明によれば、本発明の２−４
サイクル切換エンジンでは、スライドバルブをスプリン
グにより常時吸入口が閉鎖する状態で保持し、２サモ ルブの端面に空気圧を作用させ、該スライドバルブを駆
動し吸入口を開放するので、エンジンの回転速度及び負
荷の変化に応じて２サイクル運転または４サイクル運転
を切換える際の応答が俊敏で、かつ高信頼性を有する２
−４サイクル切換エンジンを提供できる。(Effects of the Invention) As explained above, according to the present invention, 2-4 of the present invention
In a cycle switching engine, the slide valve is held in a state in which the intake port is always closed by a spring, and air pressure is applied to the end face of the two-thermal valve to drive the slide valve and open the intake port, so the rotational speed and load of the engine are controlled. 2 with quick response and high reliability when switching between 2-cycle operation or 4-cycle operation in response to changes in
- A four-cycle switching engine can be provided.

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

第１図は、本発明によりエンジンの断面図、第２図は、
■−■断面図、第３図は、スライドバルブの作動を示す
斜視図である。 １・・・エンジン本体、２・・・ピストン、３・・・ス
ライドバルブ、５・・・吸気バルブ、６・・・排気バル
ブ、７・・・ターボチャージャ、８・・・コントローラ
、１２・・・吸入口、３１・・・窓部、３４・・・スプ
リング。 特許出願人　株式会社いすヌセラミックス研究所代　　
理　　人　　弁理士　　　辻　　　　　　　　實第２ 図FIG. 1 is a sectional view of an engine according to the present invention, and FIG.
3 is a perspective view showing the operation of the slide valve. DESCRIPTION OF SYMBOLS 1... Engine body, 2... Piston, 3... Slide valve, 5... Intake valve, 6... Exhaust valve, 7... Turbocharger, 8... Controller, 12...・Intake port, 31...window, 34...spring. Patent applicant: Isunu Ceramics Laboratory Co., Ltd.
Attorney: Patent Attorney Minoru Tsuji Figure 2

Claims (7)

【特許請求の範囲】[Claims] （１）エンジンの運転状態に応じて２サイクル作動と４
サイクル作動との選択が自在であり、２サイクル作動時
にはシリンダの下部に設けられた吸入口から吸気を行な
う２−４サイクル切換エンジンにおいて、上記シリンダ
の外周部に設けられ上記吸入口を閉塞開放自在にするス
ライドバルブと、上記スライドバルブにて吸入口を閉塞
する方向に該スライドバルブをバイアスするバイアス手
段と、２サイクル作動時に上記バイアス手段のバイアス
力に抗してスライドバルブを吸入口開放方向に駆動する
空気圧利用のスライドバルブ駆動手段とを有することを
特徴とする２−４サイクル切換エンジン。(1) 2-cycle operation and 4-cycle operation depending on the engine operating condition
In a 2-4 cycle switching engine that can freely select between cycle operation and takes air from an intake port provided at the bottom of the cylinder during 2-cycle operation, the intake port provided on the outer periphery of the cylinder can be freely closed and opened. a slide valve that biases the slide valve in a direction in which the slide valve closes the inlet; and a bias means that biases the slide valve in a direction in which the inlet is closed by the slide valve, and a slide valve in a direction in which the inlet is opened against the bias force of the bias means during two-cycle operation. 1. A 2-4 cycle switching engine, comprising: a pneumatic slide valve driving means. （２）上記スライドバルブは上記シリンダの外周面に沿
って湾曲した曲板形状であることを特徴とする請求項（
１）記載の２−４サイクル切換エンジン。(2) Claim (2) characterized in that the slide valve has a curved plate shape that is curved along the outer peripheral surface of the cylinder.
1) The 2-4 cycle switching engine described above. （３）上記バイアス手段は、上記スライドバルブの一方
の端面に押接されたスプリングであることを特徴とする
請求項（２）記載の２−４サイクル切換エンジン。(3) The 2-4 cycle switching engine according to claim 2, wherein the biasing means is a spring pressed against one end face of the slide valve. （４）上記スライドバルブ駆動手段は、上記スライドバ
ルブの他方の端面に空気圧を直接作用せしめ該スライド
バルブを駆動することを特徴とする請求項（２）記載の
２−４サイクル切換エンジン。(4) The 2-4 cycle switching engine according to claim 2, wherein the slide valve driving means drives the slide valve by applying air pressure directly to the other end face of the slide valve. （５）上記スライドバルブはセラミックからなることを
特徴とする請求項（１）記載の２−４サイクル切換エン
ジン。(5) The 2-4 cycle switching engine according to claim 1, wherein the slide valve is made of ceramic. （６）上記セラミックは窒化珪素であることを特徴とす
る請求項（５）記載の２−４サイクル切換エンジン。(6) The 2-4 cycle switching engine according to claim 5, wherein the ceramic is silicon nitride. （７）上記スライドバルブは上記シリンダの外周面に沿
って湾曲した２枚の曲板からなることを特徴とする請求
項（１）記載の２−４サイクル切換エンジン。(7) The 2-4 cycle switching engine according to claim 1, wherein the slide valve is comprised of two curved plates curved along the outer peripheral surface of the cylinder.
JP17932790A 1990-07-06 1990-07-06 Two-four cycle switchable engine Pending JPH0466729A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17932790A JPH0466729A (en) 1990-07-06 1990-07-06 Two-four cycle switchable engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17932790A JPH0466729A (en) 1990-07-06 1990-07-06 Two-four cycle switchable engine

Publications (1)

Publication Number Publication Date
JPH0466729A true JPH0466729A (en) 1992-03-03

Family

ID=16063903

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17932790A Pending JPH0466729A (en) 1990-07-06 1990-07-06 Two-four cycle switchable engine

Country Status (1)

Country Link
JP (1) JPH0466729A (en)

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