JPS6369725U - - Google Patents

Description

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

第１図は本考案の実施例の平面図、第２図は各
吸気弁の動作時期及びリフトと、燃料噴射弁の噴
射時期とを示す線図、第３図は第１及び第２のス
ロツトル弁の開度とエンジン負荷との関係を示す
線図である。 １…第１吸気通路、２…第１スロツトル弁、３
…第１吸気ポート、４…第２吸気ポート、５…第
２吸気通路、６…第２スロツトル弁、７…第３吸
気ポート、１０…第１吸気弁、１１…燃焼室、１
２…第２吸気弁、１３…吸気制御弁、１４…第３
吸気弁、１５…燃料噴射弁、１６…点火栓、１９
…流量調整用スクリユー、２０…バイパス通路。 FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a diagram showing the operating timing and lift of each intake valve, and the injection timing of the fuel injection valve, and FIG. 3 is a diagram showing the first and second throttle valves. FIG. 3 is a diagram showing the relationship between valve opening and engine load. 1...First intake passage, 2...First throttle valve, 3
...first intake port, 4...second intake port, 5...second intake passage, 6...second throttle valve, 7...third intake port, 10...first intake valve, 11...combustion chamber, 1
2...Second intake valve, 13...Intake control valve, 14...Third
Intake valve, 15...Fuel injection valve, 16...Ignition plug, 19
...Screw for flow rate adjustment, 20...Bypass passage.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 燃焼室内へ供給する吸気にスワールを発生させ
る常時開放の第１の吸気ポートと、エンジンの高
負荷運転域においてのみ開放する吸気制御弁を有
しかつ燃焼室内にストレートの吸気を供給する第
２の吸気ポートと、燃料噴射弁を設けた第３の吸
気ポートとを具備し、これら第１、第２及び第３
の各吸気ポートを、第１、第２及び第３の吸気弁
を介して燃焼室にそれぞれ開口し前記第３の吸気
弁の開弁時期を前記第１の吸気弁の開弁時期より
遅らせた複吸気弁エンジンにおいて、前記第１及
び第２の吸気ポートの上流側を共に第１の吸気通
路に連通させ、前記第３の吸気ポートの上流側を
第２の吸気通路に連通させ、前記第１の吸気通路
に第１のスロツトル弁を、第２の吸気通路に第２
のスロツトル弁をそれぞれ設け、また前記第２の
吸気通路には前記第２のスロツトル弁をバイパス
する小流量のバイパス通路を設け、前記第２のス
ロツトル弁は前記第１のスロツトル弁が全開した
時から開弁し始めるよう構成したことを特徴とす
る複吸気弁エンジン。 A first intake port that is always open to generate a swirl in the intake air supplied into the combustion chamber, and a second intake port that has an intake control valve that is opened only in a high-load operating range of the engine and that supplies straight intake air into the combustion chamber. It comprises an intake port and a third intake port provided with a fuel injection valve, and these first, second and third intake ports are provided.
Each of the intake ports is opened to the combustion chamber through a first, second, and third intake valve, and the opening timing of the third intake valve is delayed from the opening timing of the first intake valve. In the dual intake valve engine, upstream sides of the first and second intake ports are both communicated with a first intake passage, an upstream side of the third intake port is communicated with a second intake passage, and the upstream side of the third intake port is communicated with the second intake passage; A first throttle valve is installed in one intake passage, and a second throttle valve is installed in a second intake passage.
throttle valves are respectively provided, and the second intake passage is provided with a small flow bypass passage that bypasses the second throttle valve, and the second throttle valve is opened when the first throttle valve is fully opened. A dual intake valve engine characterized by being configured such that the valve starts opening from .