WO2020054276A1 - Intake valve of internal combustion engine - Google Patents

Intake valve of internal combustion engine Download PDF

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Publication number
WO2020054276A1
WO2020054276A1 PCT/JP2019/031126 JP2019031126W WO2020054276A1 WO 2020054276 A1 WO2020054276 A1 WO 2020054276A1 JP 2019031126 W JP2019031126 W JP 2019031126W WO 2020054276 A1 WO2020054276 A1 WO 2020054276A1
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Prior art keywords
valve
umbrella
intake
intake valve
control valve
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PCT/JP2019/031126
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French (fr)
Japanese (ja)
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裕高 河津
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本田技研工業株式会社
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Priority to JP2018-170169 priority
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Publication of WO2020054276A1 publication Critical patent/WO2020054276A1/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/44Multiple-valve gear or arrangements, not provided for in preceding subgroups, e.g. with lift and different valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/06Valve members or valve-seats with means for guiding or deflecting the medium controlled thereby, e.g. producing a rotary motion of the drawn-in cylinder charge
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/20Shapes or constructions of valve members, not provided for in preceding subgroups of this group
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies

Abstract

Provided is an intake valve of an internal combustion engine, comprising an intake valve body 31 that is slidably supported by a valve guide 15 and that is provided with an umbrella part 33 at one end of a shaft part 32, with a peripheral edge 33c of the umbrella part 33 of the intake valve body 31 being abutted to a valve seat 14 disposed on a peripheral edge 11b of an outlet 11a of an intake port 11, wherein the intake valve is characterized: by being provided with a trumpet-shaped control valve body 50 that has a cylinder part 51 which is slidably guided on the shaft part 32 of the intake valve body 31 and an umbrella cover part 52 that covers an umbrella back surface 33b of the umbrella part 33 from the periphery of the shaft part 32; and in that a peripheral edge 52a of the umbrella cover part 52 of the control valve body 50 extends to the vicinity of a valve seat abutting section 33d of the umbrella part 33. Due to this configuration, backflow of burnt gas within the cylinder into the intake port is suppressed, exhaust efficiency is improved, unburnt fuel discharge in the exhaust gas is reduced, and deterioration of emission is prevented.

Description

内燃機関の吸気弁Intake valve of internal combustion engine
 本発明は、内燃機関の吸気弁に関する。 The present invention relates to an intake valve of an internal combustion engine.
 従来、内燃機関の吸気弁開時において、吸気ポート内圧力が燃焼室内圧力よりも低い場合には、シリンダ内の既燃ガスが吸気ポート内へ逆流して排気効率が低下し、燃焼速度の低下等の燃焼悪化を招いて未燃燃料の排出が増加してエミッションが悪化することを防止することが課題となる。 Conventionally, when the intake valve of an internal combustion engine is open, if the pressure in the intake port is lower than the pressure in the combustion chamber, the burned gas in the cylinder flows back into the intake port, reducing the exhaust efficiency and reducing the combustion speed. It is an object to prevent deterioration of emission due to increase in unburned fuel emission due to deterioration of combustion.
特開2010-174722JP 2010-174722 A
 本発明は、内燃機関の吸気弁開時において、吸気ポート内圧力が燃焼室内圧力よりも低い場合に、シリンダ内の既燃ガスが吸気ポート内へ逆流することを抑制し、排気効率を向上させ、排気ガス中の未燃燃料排出を減少させてエミッションの悪化を防止することである。 The present invention suppresses the backflow of burned gas in the cylinder into the intake port when the pressure in the intake port is lower than the pressure in the combustion chamber when the intake valve of the internal combustion engine is open, and improves the exhaust efficiency. Another object of the present invention is to reduce the emission of unburned fuel in exhaust gas to prevent emission deterioration.
 本発明は、前記課題を解決することを目的として、吸気ポートの出口に設けられ、バルブガイドにより摺動可能に支持され、燃焼室への吸気の流入を開閉面に対して垂直に開閉し、軸部の一端に傘部が設けられた吸気弁体を備え、
 前記吸気ポートの前記出口の周縁に、前記吸気弁体の傘部の周縁が当接されるバルブシートが配設された内燃機関の吸気弁において、
 前記吸気弁体の前記軸部に摺動自在にガイドされる筒部と、前記軸部の周囲から前記傘部の傘裏面を覆う傘カバー部と、を有したラッパ形状の制御弁体を備え、
 前記制御弁体の前記傘カバー部の周縁は、前記吸気弁体の前記傘部の前記バルブシートと当接するバルブシート当接部の近傍まで延びていることを特徴とする内燃機関の吸気弁である。
The present invention is provided at an outlet of an intake port, is slidably supported by a valve guide, and opens and closes an inflow of intake air to a combustion chamber perpendicularly to an opening and closing surface for the purpose of solving the above problems. An intake valve body provided with an umbrella portion at one end of the shaft portion,
In an intake valve of an internal combustion engine, a valve seat in which a peripheral edge of an umbrella portion of the intake valve body abuts on a peripheral edge of the outlet of the intake port is provided.
A trumpet-shaped control valve body having a tubular portion slidably guided by the shaft portion of the intake valve body, and an umbrella cover portion that covers the back surface of the umbrella portion from around the shaft portion. ,
A peripheral edge of the umbrella cover portion of the control valve body extends to a vicinity of a valve seat contact portion that comes into contact with the valve seat of the umbrella portion of the intake valve body. is there.
 本発明は前記したように構成されているので、吸気ポート内圧力が燃焼室内圧力よりも低い場合に、シリンダ内の既燃ガスが吸気ポート内へ逆流することを抑制し、排気効率を向上させ、排気ガス中の未燃燃料排出を減少させてエミッションの悪化を防止することができる。 Since the present invention is configured as described above, when the pressure in the intake port is lower than the pressure in the combustion chamber, the burned gas in the cylinder is prevented from flowing back into the intake port, and the exhaust efficiency is improved. In addition, the emission of unburned fuel in the exhaust gas can be reduced to prevent the emission from deteriorating.
 本発明の好適な実施形態では、前記制御弁体の前記傘カバー部の周縁は、前記バルブシートと接する位置まで延びている。 In a preferred embodiment of the present invention, a peripheral edge of the umbrella cover portion of the control valve body extends to a position in contact with the valve seat.
 この実施形態によれば、吸気弁体と制御弁体との隙間の管理が容易になり、制御弁体の傘カバー部の周縁とバルブシートとの間のシール性、耐久性が向上する。 According to this embodiment, the gap between the intake valve body and the control valve body can be easily managed, and the sealing performance and durability between the periphery of the umbrella cover of the control valve body and the valve seat are improved.
 本発明の好適な実施形態では、前記制御弁体は、前記筒部の上端部が前記バルブガイドによって、摺動自在に位置決めされる。 In a preferred embodiment of the present invention, the control valve body is slidably positioned at an upper end of the cylindrical portion by the valve guide.
 この実施形態によれば、吸気弁体の軸部に制御弁体のストッパーを加工することが不要となり、構造の簡素化およびコストの削減をすることできる。 According to this embodiment, it is not necessary to machine the stopper of the control valve body on the shaft portion of the intake valve body, so that the structure can be simplified and the cost can be reduced.
 本発明の好適な実施形態では、前記制御弁体は、前記傘カバー部の周縁が前記吸気弁の前記傘部の傘裏面に当接する傘当接部を備えている。 で は In a preferred embodiment of the present invention, the control valve body includes an umbrella contact portion where a peripheral edge of the umbrella cover portion contacts an umbrella back surface of the umbrella portion of the intake valve.
 この実施形態によれば、吸気弁体の開弁時の吸気流により制御弁体が摺動する時の特別なストッパー構造が不要となり、構造の簡素化およびコストの低減を図ることができる。 According to this embodiment, a special stopper structure is not required when the control valve body slides due to the intake air flow when the intake valve body is opened, so that the structure can be simplified and the cost can be reduced.
 本発明の好適な実施形態では、前記傘当接部は折り返し部により、周囲に弾性を持たせた構造である。 で は In a preferred embodiment of the present invention, the umbrella contact portion has a structure in which the periphery is made elastic by a folded portion.
 この実施形態によれば、傘当接部は折り返し部により周囲に弾性が持たされているので、シリンダの気密性が向上するとともに、制御弁体の耐久性が向上する。 According to this embodiment, since the umbrella contact portion is provided with elasticity around the folded portion, the airtightness of the cylinder is improved and the durability of the control valve body is improved.
 本発明の好適な実施形態では、前記折り返し部内に補強部材が配置されている。 で は In a preferred embodiment of the present invention, a reinforcing member is disposed in the folded portion.
 この実施形態によれば、制御弁体を薄肉軽量化することが可能となり、応答性向上と耐久性を確保することができる。 According to this embodiment, it is possible to reduce the thickness and weight of the control valve body, and it is possible to improve responsiveness and ensure durability.
 本発明の好適な実施形態では、前記制御弁体の前記傘カバー部のバルブシート当接面が前記バルブシートに当接する際に、前記制御弁体の前記筒部の上端部は前記バルブガイドに当接する。 In a preferred embodiment of the present invention, when the valve seat contact surface of the umbrella cover portion of the control valve body abuts on the valve seat, an upper end portion of the cylindrical portion of the control valve body is connected to the valve guide. Abut
 この実施形態によれば、吸気弁体の閉じた状態において、上下で制御弁体の位置規制が行え、制御弁体の負荷を低減され、耐久性および軽量化を図ることが可能となり、さらに制御弁体の応答性を向上することができる。 According to this embodiment, when the intake valve body is closed, the position of the control valve body can be regulated up and down, the load on the control valve body can be reduced, and the durability and weight can be reduced. The responsiveness of the valve body can be improved.
 本発明の好適な実施形態では、前記吸気弁体は、前記傘部の周縁の近傍に位置して放射状に形成された溝部を有する。 In a preferred embodiment of the present invention, the intake valve body has a radially located groove located near the periphery of the umbrella.
 この実施形態によれば、吸気弁体の開き始めにおいて、既燃ガスが燃焼室から溝部を通って吸気弁体と制御弁体との間に流れ込むので、吸気弁体の開き始めにおける制御弁体の作動性が向上する。 According to this embodiment, since the burned gas flows from the combustion chamber through the groove and between the intake valve body and the control valve body at the start of opening of the intake valve body, the control valve body at the start of opening of the intake valve body Operability is improved.
 本発明の内燃機関の吸気弁は、吸気ポート内圧力が燃焼室内圧力よりも低い場合に、シリンダ内の既燃ガスが吸気ポート内へ逆流することを抑制し、排気効率を向上させ、排気ガス中の未燃燃料排出を減少させてエミッションの悪化を防止することができる。 The intake valve of the internal combustion engine of the present invention suppresses the burned gas in the cylinder from flowing back into the intake port when the pressure in the intake port is lower than the pressure in the combustion chamber, improves the exhaust efficiency, and improves the exhaust gas. The emission of unburned fuel can be reduced to prevent deterioration of emission.
本発明の一実施の形態の吸気弁が適用された内燃機関の縦断面図である。1 is a longitudinal sectional view of an internal combustion engine to which an intake valve according to one embodiment of the present invention is applied. 吸気弁体および制御弁体の腰部拡大縦断面図である。It is a waist enlarged longitudinal sectional view of an intake valve body and a control valve body. 吸気弁体および制御弁体の要部拡大断面図である。It is an important section expanded sectional view of an intake valve body and a control valve body. 吸気弁が閉じた状態の内燃機関の要部拡大断面図である。FIG. 3 is an enlarged sectional view of a main part of the internal combustion engine in a state where an intake valve is closed. 吸気弁体が開き制御弁体が閉じた状態の内燃機関の要部拡大断面図である。FIG. 2 is an enlarged sectional view of a main part of the internal combustion engine in a state where an intake valve body is opened and a control valve body is closed. 吸気弁体および制御弁体が開いた状態の内燃機関の要部拡大断面図である。FIG. 2 is an enlarged sectional view of a main part of the internal combustion engine in a state where an intake valve body and a control valve body are open. 吸気弁体を示した斜視図である。It is the perspective view which showed the intake valve body. 制御弁体を示した斜視図である。It is the perspective view which showed the control valve body. クランク角と燃焼室内圧力、クランク角と吸気弁および排気弁のリフト量のそれぞれの関係を示したグラフである。4 is a graph showing a relationship between a crank angle and a pressure in a combustion chamber, and a relationship between a crank angle and lift amounts of an intake valve and an exhaust valve.
 以下、本発明の一実施例の内燃機関の吸気弁について、図1ないし図9を参照して説明する。 Hereinafter, an intake valve of an internal combustion engine according to an embodiment of the present invention will be described with reference to FIGS.
 図1は、本発明の内燃機関の吸気弁が適用された吸気弁30を備えた内燃機関1の動弁装置周辺の従断面図が示されたものである。内燃機関1は、4バルブ式の4ストローク内燃機関であって、クランクケース(不図示)の上にシリンダブロック2が重ねられ、さらにシリンダブロック2の上にシリンダヘッド3が重ねられて、ボルト(不図示)によりクランクケース、シリンダブロック2およびシリンダヘッド3が一体に締結されている。シリンダヘッド3の上方はヘッドカバー4に覆われている。 FIG. 1 is a sectional view showing the vicinity of a valve gear of an internal combustion engine 1 including an intake valve 30 to which the intake valve of the internal combustion engine of the present invention is applied. The internal combustion engine 1 is a four-valve, four-stroke internal combustion engine in which a cylinder block 2 is superimposed on a crankcase (not shown), and a cylinder head 3 is superimposed on the cylinder block 2, and bolts ( (Not shown), the crankcase, the cylinder block 2 and the cylinder head 3 are integrally fastened. The upper part of the cylinder head 3 is covered with a head cover 4.
 クランクケース内には、クランク軸(不図示)が回転自在に軸受けにより支持されており、シリンダブロック2には上下に貫通するシリンダボア2aが設けられている。シリンダボア2a内にピストン6が上下方向に摺動可能に嵌合されており、クランク軸のクランクピン(不図示)はコンロッド5を介してピストン6と連結されている。シリンダヘッド3には燃焼室7が形成されており、内燃機関1の燃焼室7における燃焼エネルギーは、ピストン6の運動エネルギーへ変換され、これによりピストン6が上下動されて、コンロッド5を介してクランク軸が回転駆動されるようになっている。 ク ラ ン ク In the crankcase, a crankshaft (not shown) is rotatably supported by a bearing, and the cylinder block 2 is provided with a cylinder bore 2a penetrating vertically. A piston 6 is fitted into the cylinder bore 2a so as to be slidable in the vertical direction. A crankpin (not shown) of the crankshaft is connected to the piston 6 via a connecting rod 5. A combustion chamber 7 is formed in the cylinder head 3, and combustion energy in the combustion chamber 7 of the internal combustion engine 1 is converted into kinetic energy of the piston 6, whereby the piston 6 is moved up and down, and The crankshaft is driven to rotate.
 シリンダヘッド3には、燃焼室7の上壁面に開口する吸気弁口8および排気弁口9がそれぞれ2つずつ形成され、吸気弁口8の開口面積は、排気弁口9の開口面積に比べて大きくなるように形成されている。2つの吸気弁口8と2つの排気弁口9の略中央に位置するように点火プラグ13が挿入される点火プラグ孔10が開口している。 The cylinder head 3 is formed with two intake valve ports 8 and two exhaust valve ports 9 each opening on the upper wall surface of the combustion chamber 7. The opening area of the intake valve port 8 is smaller than the opening area of the exhaust valve port 9. It is formed to be large. An ignition plug hole 10 into which the ignition plug 13 is inserted is opened so as to be located substantially at the center between the two intake valve ports 8 and the two exhaust valve ports 9.
 シリンダヘッドに3には、吸気弁口8に通じる吸気ポート11、および排気弁口9に通じる排気ポート12が形成されている。吸気弁口8には吸気弁口8を開閉するための吸気弁30が設けられている。排気弁口9には排気弁口9を開閉するための排気弁40が設けられている。吸気ポート11の出口11aの周縁11b、および排気ポート12の出口12aの周縁12bには、それぞれバルブシート14が圧入されている。 吸 気 The cylinder head 3 has an intake port 11 communicating with the intake valve port 8 and an exhaust port 12 communicating with the exhaust valve port 9. The intake valve port 8 is provided with an intake valve 30 for opening and closing the intake valve port 8. The exhaust valve port 9 is provided with an exhaust valve 40 for opening and closing the exhaust valve port 9. Valve seats 14 are press-fitted into a peripheral edge 11b of an outlet 11a of the intake port 11 and a peripheral edge 12b of an outlet 12a of the exhaust port 12, respectively.
 吸気弁30は、軸部32および傘部33とからなる吸気弁体31(図7参照)と、吸気弁体31の軸部32に摺動自在に取り付けられた制御弁体50(図8参照)を備えている。排気弁40は軸部41と傘部42とから構成されている。傘部33、42はバルブシート14が圧入された吸気弁口8、排気弁口9を開閉する弁体であって、軸部32、41は傘部33、42から燃焼室7の外方に延び、シリンダヘッド3に嵌合されたバルブガイド15に摺動自在に嵌装されている。吸気弁30は吸気ポート11の出口11aに設けられ、排気弁40は排気ポート12の出口12aに設けられている。吸気弁30および排気弁40は、それぞれバルブガイド15により摺動可能に支持され、燃焼室7への吸気の流入・流出を開閉面に対して垂直に開閉するように配設されている。 The intake valve 30 includes an intake valve body 31 (see FIG. 7) including a shaft portion 32 and an umbrella portion 33, and a control valve body 50 (see FIG. 8) slidably attached to the shaft portion 32 of the intake valve body 31. ). The exhaust valve 40 includes a shaft 41 and an umbrella 42. The umbrella portions 33 and 42 are valve bodies for opening and closing the intake valve port 8 and the exhaust valve port 9 into which the valve seats 14 are press-fitted. The shaft portions 32 and 41 extend outward from the combustion chamber 7 from the umbrella portions 33 and 42. It extends and is slidably fitted to the valve guide 15 fitted to the cylinder head 3. The intake valve 30 is provided at an outlet 11a of the intake port 11, and the exhaust valve 40 is provided at an outlet 12a of the exhaust port 12. The intake valve 30 and the exhaust valve 40 are slidably supported by the valve guides 15, respectively, and are disposed so as to open and close the inflow and outflow of intake air to and from the combustion chamber 7 perpendicularly to the opening and closing surface.
 吸気弁体31および排気弁40の軸端部32a、41aはバルブガイド15の上方に突出されている。この軸端部32a、41aは、スプリングリテーナ16に保持されている。スプリングリテーナ16と、これと対向するようにシリンダヘッド3に支持されたバネ受け部材17との間に、吸気弁30および排気弁40の軸部32、41の周りを囲むようにコイル状弁バネ18が圧縮状態で取り付けられている。当該コイル状弁バネ18により吸気弁30および排気弁40は常に閉じられる方向に付勢されている。 The shaft ends 32a and 41a of the intake valve body 31 and the exhaust valve 40 project above the valve guide 15. The shaft ends 32a and 41a are held by the spring retainer 16. A coiled valve spring is provided between the spring retainer 16 and the spring receiving member 17 supported by the cylinder head 3 so as to face the shaft retainer 16 so as to surround the shaft portions 32 and 41 of the intake valve 30 and the exhaust valve 40. 18 is mounted in a compressed state. The intake valve 30 and the exhaust valve 40 are always urged by the coiled valve spring 18 in a direction to be closed.
 吸気弁30および排気弁40の開閉作動をなすための作動機構である動弁装置21が、シリンダヘッド3上部に設けられている。動弁装置21は、吸気カム軸22および該吸気カム軸22と一体に回転する吸気カム24と、排気カム軸23および該排気カム軸23と一体に回転する排気カム25を備えている。吸気カム軸22および排気カム軸23には被駆動ギア(不図示)が一体に回転されるようそれぞれ設けられており、該被駆動ギアと、クランクシャフトと一体回転される駆動ギア(不図示)とに、カムチェーン(不図示)が架け渡されており、クランクシャフトの回転にともない、吸気カム軸22および排気カム軸23が所定タイミングで回転されるようになっている。吸気カム軸22および排気カム軸23の回転により、吸気カム24および排気カム25が回転され、吸気カム24のカム面24aおよび排気カム25のカム面25aの形状に従って、リフタ19およびシム20を介して、吸気弁30および排気弁40が押動され、吸気弁口8および排気弁口9が所定のタイミングで開閉されるようになっている。 弁 A valve operating device 21 as an operating mechanism for opening and closing the intake valve 30 and the exhaust valve 40 is provided above the cylinder head 3. The valve gear 21 includes an intake camshaft 22 and an intake cam 24 that rotates integrally with the intake camshaft 22, and an exhaust camshaft 23 and an exhaust cam 25 that rotates integrally with the exhaust camshaft 23. A driven gear (not shown) is provided on the intake camshaft 22 and the exhaust camshaft 23 so as to be integrally rotated, and the driven gear and a drive gear (not shown) integrally rotated with the crankshaft. At the same time, a cam chain (not shown) is bridged, and the intake camshaft 22 and the exhaust camshaft 23 are rotated at a predetermined timing with the rotation of the crankshaft. By the rotation of the intake cam shaft 22 and the exhaust cam shaft 23, the intake cam 24 and the exhaust cam 25 are rotated, and the lifter 19 and the shim 20 pass through the lifter 19 and the shim 20 according to the shapes of the cam surface 24a of the intake cam 24 and the cam surface 25a of the exhaust cam 25. Then, the intake valve 30 and the exhaust valve 40 are pushed, and the intake valve port 8 and the exhaust valve port 9 are opened and closed at a predetermined timing.
 吸気弁体31は、図7に示されるように、傘状に形成された傘部33と、傘部33から延びた軸部32を備えており、傘部33は燃焼室側の面の傘表面33aと燃焼室7と反対側の面の傘裏面33bからなる。図2および図4に示されるように、傘裏面33bの外周にはバルブシート14に当接される円環状のバルブシート当接部33dが所定テーパ角のテーパ面として形成され、該バルブシート当接部33dの外周からバルブシート当接部33dの外周径と略同径にされ断面形状がR状に形成された周縁33cが形成されている。周縁33cの燃焼室側の端部から燃焼室7側に傘表面33aが形成されている。 As shown in FIG. 7, the intake valve body 31 includes an umbrella portion 33 formed in an umbrella shape, and a shaft portion 32 extending from the umbrella portion 33. The umbrella portion 33 has an umbrella on a surface on the combustion chamber side. It comprises a front surface 33a and an umbrella back surface 33b on the side opposite to the combustion chamber 7. As shown in FIGS. 2 and 4, an annular valve seat contact portion 33d which is in contact with the valve seat 14 is formed on the outer periphery of the umbrella back surface 33b as a tapered surface having a predetermined taper angle. From the outer periphery of the contact portion 33d, a peripheral edge 33c having substantially the same diameter as the outer peripheral diameter of the valve seat contact portion 33d and having an R-shaped cross section is formed. An umbrella surface 33a is formed on the combustion chamber 7 side from the end of the peripheral edge 33c on the combustion chamber side.
 さらに吸気弁体31の傘裏面33bには、傘部33の周縁33cの近傍に位置して放射状に略等間隔に複数個の溝部33eが形成されている。溝部33eにより、本実施の形態では、溝部33eは6個設けられている。溝部33eは、図4に示されるように、傘部33の周縁33c近傍のバルブシート当接部33dより少し内側に入った個所から、傘部33の中心に向かって所定長さに、両端が浅く中央が深くなるように形成されている。溝部33eは、吸気弁体31の開き始めにおいて、既燃ガスを燃焼室7から溝部33eを通って吸気弁体31と後述する制御弁体50との間に流れ込むことを可能とし、制御弁体50の内側を燃焼室内圧力と同一圧にするために設けられている。 Furthermore, a plurality of grooves 33e are formed in the umbrella back surface 33b of the intake valve body 31 at substantially equal intervals radially near the peripheral edge 33c of the umbrella portion 33. In this embodiment, six grooves 33e are provided by the grooves 33e. As shown in FIG. 4, the groove 33e has a predetermined length toward the center of the umbrella portion 33 from a position slightly inside the valve seat contact portion 33d near the peripheral edge 33c of the umbrella portion 33. It is formed so as to be shallow and deep at the center. The groove portion 33e allows the burned gas to flow from the combustion chamber 7 through the groove portion 33e between the intake valve body 31 and a control valve body 50, which will be described later, when the intake valve body 31 starts to open. It is provided to make the inside of 50 the same pressure as the pressure in the combustion chamber.
 図2に示されるように、吸気弁体31の軸部32に、摺動自在に制御弁体50が取り付けられている。制御弁体50は、図8に示されるように、吸気弁体31の軸部32が挿通される筒部51と、筒部51に連なり吸気弁体31の傘部33の傘裏面33bを覆う傘カバー部52を備え、ラッパ形状に形成されている。 制 御 As shown in FIG. 2, a control valve body 50 is slidably mounted on the shaft portion 32 of the intake valve body 31. As shown in FIG. 8, the control valve body 50 covers the cylindrical portion 51 through which the shaft portion 32 of the intake valve body 31 is inserted, and covers the umbrella back surface 33 b of the umbrella portion 33 of the intake valve body 31 that is connected to the cylindrical portion 51. It has an umbrella cover 52 and is formed in a trumpet shape.
 制御弁体50の筒部51は、図2に示されるように、吸気弁体31の軸部32と若干のクリアランスを持って略同径にされており、吸気弁体31の軸部32が制御弁体50の筒部51内で摺動できるようになっている。 As shown in FIG. 2, the cylindrical portion 51 of the control valve body 50 has substantially the same diameter as the shaft portion 32 of the intake valve body 31 with a slight clearance. The control valve body 50 can slide within the cylindrical portion 51.
 制御弁体50の傘カバー部52は、傘部33の傘裏面33bに沿ってかつ傘裏面33bと少しクリアランスを持つ形状に形成されている。傘カバー部52は、吸気弁体31の傘部33の傘裏面33bを覆っている。図4に示されるように、傘カバー部52の周縁52aは、吸気弁体31の傘部33のバルブシート14と当接するバルブシート当接部33dの近傍まで延びて形成されている。 The umbrella cover portion 52 of the control valve element 50 is formed along the umbrella back surface 33b of the umbrella portion 33 and in a shape having a slight clearance with the umbrella back surface 33b. The umbrella cover portion 52 covers the umbrella back surface 33b of the umbrella portion 33 of the intake valve body 31. As shown in FIG. 4, the peripheral edge 52 a of the umbrella cover portion 52 is formed to extend to the vicinity of a valve seat contact portion 33 d that contacts the valve seat 14 of the umbrella portion 33 of the intake valve body 31.
 図4に示されるように、制御弁体50の傘カバー部52の周縁52aは、吸気弁体31の傘部33の傘裏面33bに当接する傘当接部53となっている。傘当接部53は、傘カバー部52の周縁52aが吸気弁体31の傘裏面33b側に向かって折り返された折り返し部53aとなっており、周囲に弾性を持たせた構造となっている。折り返し部53a内には、補強部材としてのリング部材53bが、折り返し部53aにより巻き込まれて配設されている。 As shown in FIG. 4, the peripheral edge 52 a of the umbrella cover 52 of the control valve element 50 is an umbrella contact part 53 that contacts the umbrella back surface 33 b of the umbrella part 33 of the intake valve element 31. The umbrella contact portion 53 is a folded portion 53a in which the peripheral edge 52a of the umbrella cover portion 52 is folded toward the umbrella back surface 33b of the intake valve body 31, and has a structure having elasticity around the umbrella cover portion 52. . In the folded portion 53a, a ring member 53b as a reinforcing member is disposed so as to be wound around by the folded portion 53a.
 吸気弁口8の周縁に圧入されたバルブシート14は、吸気弁体31の傘部33のバルブシート当接部33dが当接される吸気弁体当接面14aと、該吸気弁体当接面14aより内径の小さい段部14bが形成されている。制御弁体50の周縁52aのバルブシート当接面52bが、段部14bの制御弁体当接面14cに当接されるようになっている。 The valve seat 14 press-fitted into the peripheral edge of the intake valve port 8 has an intake valve element contact surface 14a with which the valve seat contact part 33d of the umbrella part 33 of the intake valve element 31 contacts, and the intake valve element contact. A step 14b having a smaller inner diameter than the surface 14a is formed. The valve seat abutment surface 52b of the peripheral edge 52a of the control valve body 50 abuts on the control valve body abutment surface 14c of the step portion 14b.
 制御弁体50の筒部51の上端部51aは、図3に示されるように、折り返された形状に形成されている。図2に示されるように、制御弁体50の傘カバー部52の周縁52aがバルブシート14の制御弁体当接面14cと当接している場合に、制御弁体50の筒部51の上端部51aの頂部51bはバルブガイド15の下端部15aに当接される長さに設定されている。 上端 The upper end 51a of the cylindrical portion 51 of the control valve body 50 is formed in a folded shape as shown in FIG. As shown in FIG. 2, when the peripheral edge 52 a of the umbrella cover 52 of the control valve body 50 is in contact with the control valve body contact surface 14 c of the valve seat 14, the upper end of the cylindrical portion 51 of the control valve body 50 The top 51b of the portion 51a is set to have a length that abuts against the lower end 15a of the valve guide 15.
 図9に、制御弁体50を備えた本発明の実施の形態の吸気弁30と、制御弁体を具備しない従来の吸気弁について、内燃機関1の1サイクルにおいてクランク角ごとに計測した燃焼室内圧力と吸気ポート内圧力の変化、および吸気弁30と排気弁40のバルブリフト量を示した。図9を参照して、本発明の吸気弁30と従来の吸気弁との作動状態を比較して説明する。本発明の吸気弁30と従来の吸気弁とは、制御弁体50を具備するか否かが異なるが、他の構成は略同じ構成にされている。 FIG. 9 shows the combustion chamber measured for each crank angle in one cycle of the internal combustion engine 1 for the intake valve 30 of the embodiment of the present invention having the control valve body 50 and the conventional intake valve having no control valve body. Changes in pressure and pressure in the intake port, and valve lift amounts of the intake valve 30 and the exhaust valve 40 are shown. With reference to FIG. 9, the operation states of the intake valve 30 of the present invention and the conventional intake valve will be compared and described. The intake valve 30 of the present invention is different from the conventional intake valve in whether or not the control valve body 50 is provided, but other configurations are substantially the same.
 図9(a)のグラフでは、制御弁体50を備えた本発明の吸気弁30を用いた内燃機関の吸気ポート内圧力の変化を実線により示し、制御弁体50を具備しない従来の吸気弁を用いた内燃機関の吸気ポート内圧力の変化を一点鎖線により示している。さらに、燃焼室内圧力の変化を点線において示している。図9(b)のグラフでは、クランク角ごとの吸気弁および排気弁のバルブリフト量を示している。 In the graph of FIG. 9A, the change in the pressure in the intake port of the internal combustion engine using the intake valve 30 of the present invention having the control valve body 50 is indicated by a solid line, and the conventional intake valve without the control valve body 50 is shown. The change in the pressure in the intake port of the internal combustion engine using the dashed line is indicated by a dashed line. Further, a change in the pressure in the combustion chamber is indicated by a dotted line. The graph in FIG. 9B shows the valve lift of the intake valve and the exhaust valve for each crank angle.
 内燃機関1は、クランク角0度、360度において上死点となり、180度、540度において下死点となっている。排気弁40は、180度の下死
点の手前で開弁を開始し、360度の上死点の後に閉弁する。吸気弁30は、360度の上死点の手前で開弁を開始し、540度の下死点の後に閉弁する。排気弁40および吸気弁30は、360度の上死点の前後でオーバーラップして開弁している。
The internal combustion engine 1 has a top dead center at a crank angle of 0 degrees and 360 degrees, and has a bottom dead center at 180 degrees and 540 degrees. The exhaust valve 40 starts opening just before the bottom dead center of 180 degrees and closes after the top dead center of 360 degrees. The intake valve 30 starts opening just before the top dead center of 360 degrees and closes after the bottom dead center of 540 degrees. The exhaust valve 40 and the intake valve 30 overlap and open before and after the top dead center of 360 degrees.
 制御弁体50を具備しない吸気弁を用いた従来の吸気弁の作動および吸気ポート内圧力の変化について、図9を参照して説明する。 The operation of the conventional intake valve using the intake valve without the control valve body 50 and the change in the pressure in the intake port will be described with reference to FIG.
 吸気弁のリフトが開始すると、従来の吸気弁は制御弁体を具備しないので、燃焼室と吸気ポートとが連通される。図9(a)の一点鎖線および点線で示されるように、燃焼室内圧力が吸気ポート内圧力より高い特定のエンジン回転域においては、燃焼室内圧力と吸気ポート内圧力の差圧分、燃焼室7内の既燃ガスが吸気ポート11から燃焼室7へと流れ、燃焼室内圧と吸気ポート内圧力が一致するまで流入する。その後、ピストン6が下降し燃焼室内圧力が低下し、吸気ポート11から燃焼室7へと吸気が送られるようになる。 (4) When the lift of the intake valve starts, the combustion chamber and the intake port communicate with each other because the conventional intake valve has no control valve body. As shown by the one-dot chain line and the dotted line in FIG. 9A, in a specific engine rotation region where the pressure in the combustion chamber is higher than the pressure in the intake port, the difference between the pressure in the combustion chamber and the pressure in the intake port is calculated by the difference between the pressure in the combustion chamber 7 The burned gas inside flows from the intake port 11 to the combustion chamber 7 and flows in until the pressure in the combustion chamber matches the pressure in the intake port. Thereafter, the piston 6 descends, the pressure in the combustion chamber decreases, and intake air is sent from the intake port 11 to the combustion chamber 7.
 このように、従来の吸気弁では、開弁開始時に既燃ガスが燃焼室から吸気ポート11へと逆流するので、燃焼室7内の排気効率が低下して燃焼悪化を招ねくこととなり、主に燃焼速度が低下する。この影響により排気弁開時までに燃焼が完了しないサイクルが発生し、未燃燃料排出が増加することで、エミッション悪化を招く。 As described above, in the conventional intake valve, the burned gas flows back from the combustion chamber to the intake port 11 at the start of the valve opening, so that the exhaust efficiency in the combustion chamber 7 is reduced and the combustion is deteriorated. Mainly the burning rate decreases. Due to this effect, a cycle in which combustion is not completed by the time the exhaust valve is opened occurs, and the emission of unburned fuel increases, resulting in deterioration of emission.
 次に、本実施の形態の吸気弁30の作動について、図2ないし図6および図9に基づいて説明する。吸気弁30が閉弁状態の時には、図4に示されるように、バルブシート14の吸気弁体当接面14aに吸気弁30の傘部33のバルブシート当接部33dが押し付けられるとともに、バルブシート14の制御弁体当接面14cに制御弁体50の傘カバー部52のバルブシート当接面52bが押し付けられており、吸気ポート11からシリンダ26内への吸気の流入が遮断されるとともに、シリンダ26から吸気ポート11へガスが逆流することがない。 Next, the operation of the intake valve 30 according to the present embodiment will be described with reference to FIGS. 2 to 6 and FIG. When the intake valve 30 is in the closed state, as shown in FIG. 4, the valve seat contact portion 33d of the umbrella portion 33 of the intake valve 30 is pressed against the intake valve body contact surface 14a of the valve seat 14, and The valve seat abutment surface 52b of the umbrella cover 52 of the control valve body 50 is pressed against the control valve abutment surface 14c of the seat 14, and the flow of intake air from the intake port 11 into the cylinder 26 is shut off. Gas does not flow backward from the cylinder 26 to the intake port 11.
 吸気弁30が開弁を開始して吸気弁体31が燃焼室7側に移動すると、図5に示されるように、吸気弁体31のバルブシート当接部33dが、バルブシート14の吸気弁体当接面14aから離れ始める。その際、図9(a)に示されるように燃焼室内圧力が吸気ポート内圧力よりも高い状態となっており、図5に示されるように、シリンダ26内の既燃ガスが、吸気弁体31のバルブシート当接部33dとバルブシート14の吸気弁体当接面14aとの隙間を通過して、吸気弁体31の傘部33の傘裏面33bと制御弁体50の内側の間に流入して、制御弁体50の内側は燃焼室内圧力と同圧となる。 When the intake valve 30 starts to open and the intake valve body 31 moves to the combustion chamber 7 side, as shown in FIG. 5, the valve seat contact portion 33d of the intake valve body 31 Start to separate from the body contact surface 14a. At that time, as shown in FIG. 9A, the pressure in the combustion chamber is higher than the pressure in the intake port, and as shown in FIG. 31 passes through the gap between the valve seat contact portion 33d of the valve seat 31 and the intake valve body contact surface 14a of the valve seat 14, and between the umbrella back surface 33b of the umbrella portion 33 of the intake valve body 31 and the inside of the control valve body 50. After flowing in, the inside of the control valve body 50 becomes the same pressure as the pressure in the combustion chamber.
 燃焼室内圧力が吸気ポート内圧力よりも高いので、制御弁体50の傘カバー部52のバルブシート当接面52bがバルブシート14の制御弁体当接面14cに押し付けられ、吸気弁体31は開弁しているが、制御弁体50は閉じられ、既燃ガスがシリンダ26から吸気ポート11に逆流することを阻止する。また図3に示されるように、制御弁体50は制御弁体50の筒部51の上端部51aは、バルブガイド15の下端部15aに押し付けられて、制御弁体50の軸方向の移動が規制される。 Since the pressure in the combustion chamber is higher than the pressure in the intake port, the valve seat contact surface 52b of the umbrella cover portion 52 of the control valve member 50 is pressed against the control valve member contact surface 14c of the valve seat 14, and the intake valve member 31 Although the valve is open, the control valve element 50 is closed to prevent the burned gas from flowing back from the cylinder 26 to the intake port 11. As shown in FIG. 3, the control valve body 50 is configured such that the upper end 51 a of the cylindrical portion 51 of the control valve body 50 is pressed against the lower end 15 a of the valve guide 15 so that the control valve body 50 moves in the axial direction. Be regulated.
 シリンダ26内の排気が進むとともにピストンが下降し、燃焼室内圧力が吸気ポート内圧力と同じになりさらに吸気ポート内圧力よりも低くなると、図6に示されるように、制御弁体50が、吸気ポート内圧力により、シリンダ26側に向かって制御弁体50の傘当接部53が吸気弁30の傘部33の傘裏面33bに当接するまで移動し、制御弁体50も開弁して吸気ポート11からシリンダ26への吸気が開始される。下死点を過ぎ吸気弁30が閉じられると、シリンダ26内のガスは圧縮されて燃焼室内圧力は上昇する。 When the exhaust gas in the cylinder 26 advances and the piston descends, and the pressure in the combustion chamber becomes equal to the intake port pressure and becomes lower than the intake port pressure, as shown in FIG. Due to the pressure in the port, the umbrella contact portion 53 of the control valve body 50 moves toward the cylinder 26 until the umbrella back surface 33b of the umbrella portion 33 of the intake valve 30 comes into contact. The intake from the port 11 to the cylinder 26 is started. When the intake valve 30 is closed past the bottom dead center, the gas in the cylinder 26 is compressed, and the pressure in the combustion chamber increases.
 本実施の形態の吸気弁30は前記したように構成されているので、以下の効果を奏する。 吸 気 Since the intake valve 30 of the present embodiment is configured as described above, the following effects are obtained.
 本発明の実施の形態の吸気弁30は、吸気ポート11の出口11aに設けられ、バルブガイド15により摺動可能に支持され、燃焼室7への吸気の流入を開閉面に対して垂直に開閉し、軸部32の一端に傘部33が設けられた吸気弁30を備え、吸気ポート11の出口11aの周縁11bに、吸気弁30の傘部33の周縁33cが当接されるバルブシート14が配設され、吸気弁30の軸部32に摺動自在にガイドされる筒部51と、軸部32の周囲から傘部33の傘裏面33bを覆う傘カバー部52とを有したラッパ形状の制御弁体50を備え、制御弁体50の傘カバー部52の周縁52aは、吸気弁30の傘部33のバルブシート14と当接するバルブシート当接部33dの近傍まで延びている。 The intake valve 30 according to the embodiment of the present invention is provided at the outlet 11a of the intake port 11, is slidably supported by the valve guide 15, and opens and closes the flow of intake air into the combustion chamber 7 perpendicularly to the opening and closing surface. The valve seat 14 includes an intake valve 30 having an umbrella portion 33 at one end of a shaft portion 32, and a peripheral edge 33c of the umbrella portion 33 of the intake valve 30 abutting against a peripheral edge 11b of an outlet 11a of the intake port 11. A trumpet shape having a tubular portion 51 slidably guided by a shaft portion 32 of the intake valve 30 and an umbrella cover portion 52 that covers the umbrella back surface 33b of the umbrella portion 33 from around the shaft portion 32 The peripheral edge 52a of the umbrella cover portion 52 of the control valve body 50 extends to the vicinity of the valve seat contact portion 33d that contacts the valve seat 14 of the umbrella portion 33 of the intake valve 30.
 このように構成されているので、図9に示されるように吸気弁30の開弁開始時に吸気ポート内圧力が燃焼室内圧力よりも低い場合に、図5に示されるように吸気弁30のバルブシート当接部33dがバルブシート14の吸気弁体当接面14aから離れて、吸気弁30が開弁を始める。吸気弁30が開弁を始めると、シリンダ26内の既燃ガスが、吸気弁30のバルブシート当接部33dとバルブシート14の吸気弁体当接面14aとの隙間を通過して、吸気弁30の傘部33の傘裏面33bと、制御弁体50の内側の間に流入して、制御弁体50の内側は燃焼室内圧力と同じなる。
 一方、制御弁体50の外側は燃焼室内圧力より低い吸気ポート内圧力と同じ圧になっているので、制御弁体50の上端部51aはバルブガイド15の下端部15aに押し付けられるとともに、制御弁体50のバルブシート当接面52bがバルブシート14の吸気弁体当接面14aに押し付けられる。このように吸気弁30が開弁しても制御弁体50が閉弁しているので、シリンダ26内の既燃ガスが吸気ポート11内へ逆流することを抑制し、排気効率を向上させ、排気ガス中の未燃燃料排出を減少させてエミッションの悪化を防止することができる。
With this configuration, when the pressure in the intake port is lower than the pressure in the combustion chamber at the start of opening of the intake valve 30 as shown in FIG. 9, the valve of the intake valve 30 as shown in FIG. The seat contact portion 33d separates from the intake valve body contact surface 14a of the valve seat 14, and the intake valve 30 starts to open. When the intake valve 30 starts to open, the burned gas in the cylinder 26 passes through a gap between the valve seat contact portion 33d of the intake valve 30 and the intake valve body contact surface 14a of the valve seat 14, and It flows between the umbrella back surface 33b of the umbrella portion 33 of the valve 30 and the inside of the control valve body 50, and the inside of the control valve body 50 becomes the same as the pressure in the combustion chamber.
On the other hand, since the outside of the control valve body 50 has the same pressure as the intake port pressure lower than the combustion chamber pressure, the upper end 51a of the control valve body 50 is pressed against the lower end 15a of the valve guide 15, and The valve seat contact surface 52b of the body 50 is pressed against the intake valve body contact surface 14a of the valve seat 14. Since the control valve body 50 is closed even when the intake valve 30 is opened in this way, the burned gas in the cylinder 26 is suppressed from flowing back into the intake port 11, and the exhaust efficiency is improved. The emission of unburned fuel in the exhaust gas can be reduced to prevent emission deterioration.
 さらに、制御弁体50の傘カバー部52の周縁52aは、バルブシート14と接する位置まで延びているので、吸気弁30と制御弁体50との隙化の管理が容易になり、制御弁体50の傘カバー部52の周縁52aのバルブシート当接面52bとバルブシート14との間のシール性、耐久性が向上する。 Further, since the peripheral edge 52a of the umbrella cover 52 of the control valve body 50 extends to a position in contact with the valve seat 14, the management of the gap between the intake valve 30 and the control valve body 50 becomes easy, and the control valve body Sealability and durability between the valve seat 14 and the valve seat contact surface 52b of the peripheral edge 52a of the 50 umbrella cover 52 are improved.
 また、制御弁体50は、筒部51の上端部51aがバルブガイド15によって、摺動自在に位置決めされているので、吸気弁30の軸部32に制御弁体50の位置決めのためのストッパーを加工することが不要となり、構造の簡素化およびコストの削減をすることできる。 In addition, since the control valve body 50 is slidably positioned at the upper end portion 51a of the cylindrical portion 51 by the valve guide 15, a stopper for positioning the control valve body 50 is provided on the shaft portion 32 of the intake valve 30. Processing becomes unnecessary, and the structure can be simplified and the cost can be reduced.
 さらにまた、制御弁体50は、傘カバー部52の周縁52aが吸気弁30の傘部33の傘裏面33bに当接する傘当接部53を備えているので、吸気弁30の開弁時の吸気ポート11からの吸気流により制御弁体50が摺動する時の特別なストッパー構造が不要となり、構造の簡素化およびコストの低減を図ることができる。 Furthermore, since the control valve body 50 includes the umbrella contact portion 53 in which the peripheral edge 52a of the umbrella cover portion 52 contacts the umbrella back surface 33b of the umbrella portion 33 of the intake valve 30, A special stopper structure is not required when the control valve element 50 slides due to the intake air flow from the intake port 11, so that the structure can be simplified and the cost can be reduced.
 また、制御弁体50の傘当接部53は折り返し部53aにより、周囲に弾性を持たせた構造であるので、折り返し部53aと吸気弁30およびバルブシート14とがより密着し、シリンダ26の気密性が向上するとともに、制御弁体50の耐久性が向上する。 Further, since the umbrella contact portion 53 of the control valve element 50 has a structure in which the periphery is made elastic by the folded portion 53a, the folded portion 53a and the intake valve 30 and the valve seat 14 are more closely attached to each other, and The airtightness is improved, and the durability of the control valve body 50 is improved.
 さらに、折り返し部53a内に補強部材としての金属製のリング部材53bが配置されているので、強度を維持しつつ制御弁体50を薄肉軽量化することが可能となり、制御弁体50の応答性向上と耐久性を確保することができる。 Furthermore, since the metal ring member 53b as a reinforcing member is disposed in the folded portion 53a, the thickness and weight of the control valve body 50 can be reduced while maintaining strength, and the responsiveness of the control valve body 50 can be improved. Improvement and durability can be ensured.
 さらにまた、制御弁体50の傘カバー部52のバルブシート当接面52bが前記バルブシート14に当接する際に、制御弁体50の筒部51の上端部51aはバルブガイド15に当接されるように、制御弁体50が構成されているので、吸気弁30の閉じた状態において、上下で制御弁体50の位置規制が行え、制御弁体50の負荷を低減され、耐久性および軽量化を図ることが可能となり、さらに制御弁体50の応答性を向上することができる。 Furthermore, when the valve seat contact surface 52b of the umbrella cover portion 52 of the control valve body 50 comes into contact with the valve seat 14, the upper end portion 51a of the tubular portion 51 of the control valve body 50 comes into contact with the valve guide 15. As described above, since the control valve element 50 is configured, the position of the control valve element 50 can be regulated up and down in a state where the intake valve 30 is closed, the load on the control valve element 50 is reduced, and the durability and light weight are reduced. Therefore, the response of the control valve element 50 can be further improved.
 さらに、吸気弁体31は、前記傘部33の周縁33cの近傍に位置して放射状に形成された溝部33eを有するので、吸気弁体31の開き始めにおいて、既燃ガスが燃焼室から溝部33eを通って吸気弁体31と制御弁体50との間に流れ込むので、吸気弁体31の開き始めにおける制御弁体50の作動性が向上する。 Further, since the intake valve body 31 has a radially formed groove portion 33e located near the peripheral edge 33c of the umbrella portion 33, when the intake valve body 31 starts to open, the burned gas flows from the combustion chamber into the groove portion 33e. As a result, the air flows between the intake valve element 31 and the control valve element 50 through the valve, so that the operability of the control valve element 50 when the intake valve element 31 starts to open is improved.
 以上、本発明の一実施形態につき説明したが、本発明の態様が上記実施形態に限定されず、本発明の要旨の範囲で、多様な態様で実施されるものを含むことは勿論である。
 例えば、本発明の自動二輪車用内燃機関は、各請求項の要件を備える自動二輪車用内燃機関であれば、実施形態のものに限定されず気筒数を問わず、自動二輪車は実施形態に示す自動二輪車に限定されない。
As mentioned above, although one Embodiment of this invention was described, the aspect of this invention is not limited to the said Embodiment, Of course, what is implemented in various aspects is included in the range of the summary of this invention.
For example, the motorcycle internal combustion engine of the present invention is not limited to the embodiment as long as it is a motorcycle internal combustion engine having the requirements of each claim, regardless of the number of cylinders. It is not limited to motorcycles.
 1…内燃機関、2…シリンダブロック、7…燃焼室、8…吸気弁口、9…排気弁口、11…吸気ポート、11a…出口、11b…周縁、12…排気ポート、14…バルブシート、15…バルブガイド、26…シリンダ、30…吸気弁、31…吸気弁体、32…軸部、33…傘部、33b…傘裏面、33c…周縁、33d…バルブシート当接部、33e…溝部、50…制御弁体、51…筒部、51a…上端部、51b…頂部、52…傘カバー部、52a…周縁、52b…バルブシート当接面、53…傘当接部、53a…折り返し部、53b…リング部材。 DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 2 ... Cylinder block, 7 ... Combustion chamber, 8 ... Intake valve port, 9 ... Exhaust valve port, 11 ... Intake port, 11a ... Outlet, 11b ... Peripheral edge, 12 ... Exhaust port, 14 ... Valve seat, 15 ... valve guide, 26 ... cylinder, 30 ... intake valve, 31 ... intake valve body, 32 ... shaft part, 33 ... umbrella part, 33 b ... umbrella back surface, 33 c ... peripheral edge, 33 d ... valve seat contact part, 33 e ... groove part , 50 ... control valve element, 51 ... cylinder part, 51a ... upper end part, 51b ... top part, 52 ... umbrella cover part, 52a ... peripheral edge, 52b ... valve seat contact surface, 53 ... umbrella contact part, 53a ... folded part , 53b ... a ring member.

Claims (7)

  1.  吸気ポート(11)の出口(11a)に設けられ、バルブガイド(15)により摺動可能に支持され、燃焼室(7)への吸気の流入を開閉面に対して垂直に開閉し、軸部(32)の一端に傘部(33)が設けられた吸気弁体(31)を備え、
     前記吸気弁体(31)の前記傘部(33)の周縁(33c)は、前記吸気ポート(11)の前記出口(11a)の周縁(11b)に配設されたバルブシート(14)に当接される内燃機関の吸気弁において、
     前記吸気弁体(31)の前記軸部(32)に摺動自在にガイドされる筒部(51)と、前記軸部(32)の周囲から前記傘部(33)の傘裏面(33b)を覆う傘カバー部(52)と、を有したラッパ形状の制御弁体(50)を備え、
     前記制御弁体(50)の前記傘カバー部(52)の前記周縁(52a)は、前記吸気弁体(31)の前記傘部(33)の前記バルブシート(14)と当接するバルブシート当接部(33d)の近傍まで延びていることを特徴とする内燃機関の吸気弁。
    It is provided at the outlet (11a) of the intake port (11), is slidably supported by the valve guide (15), and opens and closes the inflow of intake air to the combustion chamber (7) perpendicularly to the opening and closing surface. An intake valve body (31) provided with an umbrella part (33) at one end of (32),
    A peripheral edge (33c) of the umbrella portion (33) of the intake valve body (31) corresponds to a valve seat (14) disposed on a peripheral edge (11b) of the outlet (11a) of the intake port (11). In the intake valve of the internal combustion engine that is in contact,
    A cylindrical portion (51) slidably guided by the shaft portion (32) of the intake valve body (31), and an umbrella back surface (33b) of the umbrella portion (33) from around the shaft portion (32). An umbrella cover part (52), and a trumpet-shaped control valve body (50) having
    The peripheral edge (52a) of the umbrella cover portion (52) of the control valve body (50) is in contact with the valve seat (14) of the umbrella portion (33) of the intake valve body (31). An intake valve for an internal combustion engine extending to a vicinity of a contact portion (33d).
  2.  前記制御弁体(50)は、前記筒部(51)の上端部(51a)が前記バルブガイド(15)によって、摺動自在に位置決めされることを特徴とする請求項1に記載の内燃機関の吸気弁。 The internal combustion engine according to claim 1, wherein the control valve body (50) is slidably positioned at an upper end (51a) of the cylindrical portion (51) by the valve guide (15). Intake valve.
  3.  前記制御弁体(50)は、前記傘カバー部(52)の周縁(52a)が前記吸気弁(30)の前記傘部(33)の傘裏面(33b)に当接する傘当接部(53)を備えることを特徴とする請求項1または請求項2に記載の内燃機関の吸気弁。 The control valve body (50) includes an umbrella contact portion (53) in which a peripheral edge (52a) of the umbrella cover portion (52) contacts an umbrella back surface (33b) of the umbrella portion (33) of the intake valve (30). The intake valve for an internal combustion engine according to claim 1 or 2, further comprising:
  4.  前記傘当接部(53)は折り返し部(53a)により、周囲に弾性を持たせた構造であることを特徴とする請求項3に記載の内燃機関の吸気弁。 4. The intake valve for an internal combustion engine according to claim 3, wherein the umbrella contact portion (53) has a structure having elasticity around a folded portion (53a).
  5.  前記折り返し部(53a)内に補強部材(53b)を配置したことを特徴とする請求項4に記載の内燃機関の吸気弁。 The intake valve for an internal combustion engine according to claim 4, wherein a reinforcing member (53b) is disposed in the folded portion (53a).
  6.  前記制御弁体(50)の前記傘カバー部(52)のバルブシート当接面(52b)が前記バルブシート(14)に当接する際に、前記制御弁体(50)の前記筒部(51)の上端部(51a)は前記バルブガイド(15)に当接することを特徴とした請求項1に記載の内燃機関の吸気弁。 When the valve seat contact surface (52b) of the umbrella cover portion (52) of the control valve body (50) comes into contact with the valve seat (14), the tubular portion (51) of the control valve body (50) The intake valve according to claim 1, wherein an upper end (51a) of the intake valve abuts on the valve guide (15).
  7.  前記吸気弁体(31)は、前記傘部(33)の周縁(33c)の近傍に位置し、放射状に形成された溝部(33e)を有することを特徴とする請求項1に記載の内燃機関の吸気弁。 The internal combustion engine according to claim 1, wherein the intake valve body (31) is located near a peripheral edge (33c) of the umbrella portion (33) and has a radially formed groove portion (33e). Intake valve.
PCT/JP2019/031126 2018-09-12 2019-08-07 Intake valve of internal combustion engine WO2020054276A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS521229A (en) * 1975-06-24 1977-01-07 Toyota Motor Corp Suction valve having inverse flow prevention mechanism
JPS5792006U (en) * 1980-11-26 1982-06-07
JPH0575407U (en) * 1992-03-23 1993-10-15 日産ディーゼル工業株式会社 Intake valve for internal combustion engine
US7523733B2 (en) * 2007-03-20 2009-04-28 Ralph Moore Dual intake valve assembly for internal combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS521229A (en) * 1975-06-24 1977-01-07 Toyota Motor Corp Suction valve having inverse flow prevention mechanism
JPS5792006U (en) * 1980-11-26 1982-06-07
JPH0575407U (en) * 1992-03-23 1993-10-15 日産ディーゼル工業株式会社 Intake valve for internal combustion engine
US7523733B2 (en) * 2007-03-20 2009-04-28 Ralph Moore Dual intake valve assembly for internal combustion engine

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