JPS59126031A - Intake apparatus for internal-combustion engine - Google Patents

Abstract

PURPOSE:To reduce the size of an intake apparatus of an internal-combustion engine, by constituting a throttle valve by a plurality of slide plates, forming an opening communicated with at least one of a plurality of intake passages in each of the slide plates, and thereby reducing the stroke of the slide plates. CONSTITUTION:At the time of low-speed operation of an engine, control rods 51, 52 of diaphragm means 43, 44 are pulled respectively by return springs 53, 54, and a downstream-side slide plate 29 is made to slide to the right in the drawing while an upstream-side slide plate 30 is made to slide to the left, so that only the central intake passage 23 is opened through the overlap of openings 31 and 32. Accordingly, intake air is drawn into a combustion chamber efficiently at a high speed. Subsequently, when a primary throttle valve 18 is opened through operation of the throttle valve and the flow rate of intake air is increased, a solenoid valve 49 is opened by a control section 21 in response to the output of a section 20 for detecting the quantity of intake air, and the control rod 51 of the diaphragm means 43 is projected. Resultantly, the slide plate 29 is made to slide in the direction C by a sector-shaped gear 38, etc. and a third intake passage 24 is opened.

Description

【発明の詳細な説明】 本発明は単一の燃焼室に複数本の吸気通路を連通させる
とともに、これら吸気通路の少なくとも１つに絞シ弁を
設け、この絞り弁を機関の運転状況に応じて開閉するこ
とによシ全回転領域に亘って高トルクを得るようにした
内燃機関の吸気装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention allows a plurality of intake passages to communicate with a single combustion chamber, and a throttle valve is provided in at least one of these intake passages, and the throttle valve is controlled according to the operating conditions of the engine. The present invention relates to an intake system for an internal combustion engine that obtains high torque over the entire rotation range by opening and closing the intake system.

４サイクル内燃機関の吸気装置として、単一の燃焼室に
連通させた２本の吸気通路に夫々絞り弁を設け、一方の
絞り弁を全運転領域に亘って開閉作動させるとともに、
他方の絞シ弁を高負荷運転時にのみ開作動させるように
したものが知られている。このものによると、低、中負
荷運転時には、片方の吸気通路のみから燃焼室内に吸気
が供給されるので、吸気流速が増加して燃焼室内での渦
流が強まυ、燃滓効率が向上する。また、高負荷運転時
には両方の吸気通路から吸気が供給されるから、吸気効
率が向上し、最高出力が増大する利点がある。As an intake system for a four-stroke internal combustion engine, a throttle valve is provided in each of two intake passages communicating with a single combustion chamber, and one throttle valve is opened and closed over the entire operating range, and
It is known that the other throttle valve is opened only during high load operation. According to this, during low to medium load operation, intake air is supplied into the combustion chamber from only one intake passage, so the intake air velocity increases, the vortex flow in the combustion chamber becomes stronger υ, and the combustion efficiency improves. . Furthermore, since intake air is supplied from both intake passages during high-load operation, there is an advantage that intake efficiency is improved and maximum output is increased.

ところで、この種吸気装置の絞り弁として、特開昭５７
−１０２５１６号公報に示されている如く、吸気通路を
横切るように設けた１枚の弁板に開口を形成し、この弁
板をスライドさせることにより、吸気通路の開口面積を
加減するスライド形の絞シ弁が知られている。しかしな
がらこのスライド形絞り弁の場合、吸気通路の開口面積
は弁板側の開口形状とこの弁板のスライド量によって決
定されるため、吸気通路の数や間隔あるいは通路幅が増
すと、その分弁板のスライド量（ストローク）も増大す
ることになシ、したがって吸気装置が大形化する等の難
点がある。By the way, as a throttle valve for this type of intake device, Japanese Patent Application Laid-Open No. 57
As shown in Japanese Patent Publication No. 102516, a slide-type valve plate is provided in which an opening is formed in a single valve plate provided across the intake passage, and the opening area of the intake passage is adjusted by sliding the valve plate. The choke valve is known. However, in the case of this slide type throttle valve, the opening area of the intake passage is determined by the opening shape on the valve plate side and the amount of sliding of this valve plate, so if the number, spacing, or width of the intake passages increases, the valve opening area will change accordingly. There is a problem that the sliding amount (stroke) of the plate also increases, resulting in an increase in the size of the intake device.

本発明はこのような事情にもとづいてなされたもので絞
り弁をスライド形とした場合、吸気通路開閉時のスライ
ド量（ストローク）を削減でき、吸気装置の小形化を実
現できる内燃機関の吸気装置の提供を目的とする。The present invention has been made based on the above circumstances, and provides an intake system for an internal combustion engine that can reduce the amount of slide (stroke) when opening and closing the intake passage when the throttle valve is of a sliding type, thereby realizing miniaturization of the intake system. The purpose is to provide.

すなわち、本発明は上記目的を達成するだめ、絞り弁を
複数枚のスライド板から構成するとともに、各スライド
板には吸気通路の少なくとも１つに連なる開口部を形成
し、これらスライド板をそれぞれ独立して吸気通路を横
切る方向に往復動させるようにしたことを特徴とする。That is, in order to achieve the above object, the present invention consists of a throttle valve composed of a plurality of slide plates, each slide plate is formed with an opening connected to at least one of the intake passages, and these slide plates are arranged independently. It is characterized in that it is made to reciprocate in a direction across the intake passage.

以下本発明を４サイクル４気筒内燃機関に適用した図面
にもとづいて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on drawings in which the present invention is applied to a four-stroke, four-cylinder internal combustion engine.

図中１は４気筒内燃機関のシリンダブロック、２はシリ
ンダヘッドであり、シリンダブロック１内に並設した４
つの気筒３・・・にはピストン４・・・が収容されてい
るとともに、各気筒３・・・の燃焼室５・・・には第２
図に示しだように２個の吸気ポート６．６と２個の排気
ｔ−）７．７とが開設されている。これら吸気ポート６
．６および排気ポート７．７は夫々吸気バルブ８，８お
よび排気バルブ９，９により所定のタイミングで開閉さ
れる。吸気ポート６．６けその上流端において互に連通
されており、この上流端には吸気マニホールド１０が連
結されている。吸気マニホールド１０は各気筒３・・・
に対応する４本の吸気管１ノ・・・を有し、これら吸気
管１ノ・・・の上流端および下流端はフランジ部１２．
１３によって一体に連結されている。そして各吸気管１
１・・・には吸気チャンノ々１４から導出された４本の
吸気分配管１５・・・が接続されている。吸気分配管１
５・・・の下流端つまシ導出端はフランジ部１６によっ
て一体に連結されており、この７ランノ部１６を吸気マ
ニホールド１０のフランジ部１３に衝合してボルト締め
することによシ、吸気チャンバ１４と吸気管１ノ・・・
とが連通されている。In the figure, 1 is a cylinder block of a 4-cylinder internal combustion engine, 2 is a cylinder head, and 4 cylinders are installed in parallel in the cylinder block 1.
Each cylinder 3... houses a piston 4..., and the combustion chamber 5... of each cylinder 3... houses a second piston 4...
As shown in the figure, two intake ports 6.6 and two exhaust ports 7.7 are provided. These intake ports 6
．． 6 and exhaust port 7.7 are opened and closed at predetermined timing by intake valves 8, 8 and exhaust valves 9, 9, respectively. The intake ports 6.6 communicate with each other at their upstream ends, and the intake manifold 10 is connected to this upstream end. The intake manifold 10 has each cylinder 3...
The upstream and downstream ends of these intake pipes 1 are provided with flange portions 12 .
They are integrally connected by 13. and each intake pipe 1
1... are connected to four intake pipes 15 led out from the intake channels 14. Intake pipe 1
The downstream end tabs leading out ends of 5... are integrally connected by a flange part 16, and by bolting this 7 run part 16 against the flange part 13 of the intake manifold 10, the intake Chamber 14 and intake pipe 1...
are in communication.

吸気チャンバ１４の上流に連なる空気導入路１７内には
、第２図に示しだように吸入空気量を制御する１次絞り
弁１８が設けられており、この１次絞り弁１８はスロッ
トル操作に連動して開閉作動される。捷た各吸気管１ノ
・・・の下流端には電子制御式の燃料噴射弁１９・・・
が装着されており、この燃料噴射弁１９・・・は吸入空
気量に応じた量の燃料を噴射するようになっている。す
なわち、１次絞り弁１８上流の吸入空気量を検知部２０
で検知するとともに、この検知部２０は吸入空気量に応
じた電気信号をマイクロコンピュータ等の制御部２１に
出力し、この制御部２ノでは上記電気信号にもとづいて
燃料噴射弁１９・・・に吸入空気量に応じた溶料を噴射
すべく指令信号を与えるようになっている。As shown in FIG. 2, a primary throttle valve 18 for controlling the amount of intake air is provided in the air introduction path 17 connected upstream of the intake chamber 14, and this primary throttle valve 18 is used for throttle operation. They are opened and closed in conjunction with each other. At the downstream end of each cut intake pipe 1... there is an electronically controlled fuel injection valve 19...
is installed, and the fuel injection valves 19 are configured to inject fuel in an amount corresponding to the amount of intake air. That is, the detection unit 20 detects the amount of intake air upstream of the primary throttle valve 18.
At the same time, this detection section 20 outputs an electric signal corresponding to the amount of intake air to a control section 21 such as a microcomputer, and this control section 2 outputs an electric signal to the fuel injection valve 19 based on the electric signal. A command signal is given to inject solvent according to the amount of intake air.

ところで、上記吸気管１１・・・および吸気分配管１５
・・・内には、第２図に示したように夫々吸気ポート６
．６と吸気チャン・ぐ１４とを連通させる第１．第２お
よび第３の吸気通路２２゜２３．２４が３本並設されて
おシ、これら吸気通路２２，２３．２４の途中には流速
制御用の２次絞シ弁２５が設けられている。すなわち、
吸気マニホールド１０のフランジ部１３および吸気分配
管１５・・・のフランジ部１６の夫々の衝合面には、吸
気通路２２，２３．２４の並設方向に沿う細長状の凹部
２６．２７が形成されており、これら凹部２６，２７は
互に対向されてフランジ部１３．１６間に摺動室２８を
構成している。摺動室２８内には夫々第１のスライド板
２９と第２のスライド板３０が上記方向、つまり吸気通
路２２，２３．２４を横切る方向にスライド可能に収容
されており、これら両スライド板２９．３０は摺動室２
８内において摺動自在に衝合されている。第１および第
２のスライド板２９．３０には各気筒３・・・の吸気通
路２２゜２３．２４を取シ囲む略矩形状をなした４個の
開口部３１・・・および３２・・・が間隔を存して開設
されておシ、このため、上記両スライド板２９゜３０上
には開口部３１・・・、３２・・・と非開口部３３・・
・、３４・・・とがスライド方向に沿って交互に位置さ
れている。そして第１のスライド板２９の開口部３ノ・
・・と第２のスライド板３ｏの開口部３２とでは、その
開口位置がスライド方向反対側に互いに偏位されており
、したがって両スライド板２９．３０の開口部３１・・
・および３２・・・が対向合致された状態においては、
第３図に示しだように両スライド板２９．３Ｑの両側部
は丁度単一の吸気通路２２，２３．２４の幅に相当する
長さ２分だけ互に側方にずれている。また摺動室２８の
下面中央は下方に凹んでおり、との凹所３５内には第１
および第２のスライド板２９．３０の下面中央に設けた
歯部３６　、３７に噛合する扇形歯車３８．３９が収容
されている。扇形歯車３８．３９は駆動軸４０．４１の
一端部に固定されており、これら駆動軸４０゜４１の仲
、端はフランジ部１３．１６を貫通して外方に導出され
ている。なお、駆動軸４０　、４１の貫通部分には上記
摺動室２８内の気密を保つシール部側４２，４２が取着
されている。そして駆動軸４０．４１は夫々ダイヤフラ
ムアクチュエータ４３．４４によって個別に軸回シ方向
に回動される。ダイヤフラムアクチュエータ４３゜４４
については既に知られているので詳図しないが、第４図
に示したようにダイヤフラム４５゜４６によって区画さ
れた負圧室４７．４ｇが電磁弁４９．５０を介して上記
吸気チャンツク１４に連通されており、ダイヤフラム４
５．４６が吸気チャンバ１４内の負圧によって撓み変形
されると、このダイヤフラム４５．４６に連なる作動子
５１．５２が復帰スプリング５３．５４の付勢力に抗し
て夫々突出されるようになっている。この作動子５１．
５２は上記駆動軸４０゜４１の導出端部に、作動子５１
．５２の往復運動を回転運動に変換するリンクプレート
５５゜５６を介して連結され、ダイヤフラムアクチュエ
ータ４３．４４が作動子５１．５２を突出する方向に作
動されると、駆動軸４０．４１を中心として扇形歯車３
８．３９が矢印Ａ、Ｂ方向に夫々回動変位され、このた
め扇形歯車３８゜３９とかみ合うスライド板２９．３０
が摺動室２８内を互に逆向き（矢印Ｃ，Ｄ方向）にスラ
イドされるようになっている。なお、電磁弁４９゜５０
は機関が低速回転佃域から中速回転および高速回転領域
に移行した際に、上記制御部２ノからの指令信号にもと
づいて開作動され、これによってダイヤフラムアクチュ
エータ４３．４４の負圧室４７．４Ｂと吸気チャンバ１
４とが段階的に連通されるようになっている。By the way, the intake pipe 11... and the intake pipe 15
...There are intake ports 6 inside each as shown in Fig. 2.
．． 6 and the intake channel 14 are connected to each other. Three second and third intake passages 22, 23, 24 are arranged in parallel, and a secondary throttle valve 25 for flow velocity control is provided in the middle of these intake passages 22, 23, 24. . That is,
Elongated recesses 26.27 are formed in the abutting surfaces of the flange portion 13 of the intake manifold 10 and the flange portions 16 of the intake pipes 15, respectively, along the direction in which the intake passages 22, 23.24 are arranged side by side. These recesses 26 and 27 are opposed to each other to form a sliding chamber 28 between the flange portions 13 and 16. A first slide plate 29 and a second slide plate 30 are housed in the sliding chamber 28 so as to be slidable in the above-mentioned direction, that is, in a direction across the intake passages 22, 23, and 24. .30 is sliding chamber 2
8 and are slidably abutted. The first and second slide plates 29.30 have four openings 31, 32, etc. each having a substantially rectangular shape surrounding the intake passages 22, 23, 24 of each cylinder 3...・are opened at intervals, therefore, on both slide plates 29° 30, there are openings 31..., 32... and non-openings 33...
. , 34 . . . are arranged alternately along the sliding direction. Then, the opening 3 of the first slide plate 29 is
... and the opening 32 of the second slide plate 3o are offset from each other in the sliding direction, so that the opening 31 of both slide plates 29, 30...
In the state where ・and 32... are matched against each other,
As shown in FIG. 3, the sides of both sliding plates 29.3Q are offset laterally from each other by a length of two minutes, which corresponds exactly to the width of a single intake passage 22, 23.24. In addition, the center of the lower surface of the sliding chamber 28 is recessed downward, and the recess 35 includes a first
A sector gear 38.39 that meshes with teeth 36 and 37 provided at the center of the lower surface of the second slide plate 29.30 is housed. The sector gears 38, 39 are fixed to one end of the drive shaft 40, 41, and the middle and ends of these drive shafts 40, 41 pass through the flange portion 13, 16 and are led out. Note that seal portions 42, 42 are attached to the penetrating portions of the drive shafts 40, 41 to keep the inside of the sliding chamber 28 airtight. The drive shafts 40, 41 are individually rotated in the shaft rotation direction by diaphragm actuators 43, 44, respectively. Diaphragm actuator 43°44
Since this is already known, it will not be illustrated in detail, but as shown in FIG. and diaphragm 4
5.46 are bent and deformed by the negative pressure in the intake chamber 14, the actuators 51.52 connected to the diaphragms 45.46 are respectively protruded against the biasing force of the return springs 53.54. ing. This actuator 51.
Reference numeral 52 denotes an actuator 51 at the lead-out end of the drive shaft 40°41.
．． When the diaphragm actuator 43.44 is actuated in the direction of protruding the actuator 51.52, the diaphragm actuator 43.44 rotates around the drive shaft 40.41. sector gear 3
8.39 is rotationally displaced in the directions of arrows A and B, respectively, and thus the slide plate 29.30 meshes with the sector gear 38°39.
are slid in the sliding chamber 28 in opposite directions (directions of arrows C and D). In addition, the solenoid valve 49°50
are opened based on a command signal from the control section 2 when the engine shifts from a low speed rotation range to a medium speed rotation range and a high speed rotation range, thereby opening the negative pressure chambers 47. of the diaphragm actuators 43 and 44. 4B and intake chamber 1
4 are communicated in stages.

次に上記構成の作用について説明する。Next, the operation of the above configuration will be explained.

機関の回転数がアイドリング時のように低い場合には、
ダイヤフラムアクチュエータ４３゜４４０作動子５１．
５２が復帰スプリング５３゜５４の付勢力により引張ら
れており、このだめ１流側のスライド板２９は第４図中
右側にスライドされ、かつ上流側のスライド板３θは左
側にスライドされた状態にある。この場合、第５図に示
すように３本の吸気通路２２，２３．２４の内、左端の
第１の吸気通路２２上にはスライド板３０の排量口部３
４が、また右端の第３の吸気通路２４上にはスライド板
２９の非開口部３３が丁度位置されて、これら両吸気通
路２２゜２４は閉塞された状態にある。これに対して、
中央の第２の吸気通路２３には両スライド板２９゜３０
０開口部３１．３２が重なり合っているため、この吸気
通路２３のみが開かれており、結局吸気は第２の吸気通
路２３のみを通って吸気ポート６．６に導びかれる。し
だがって、吸気の流速が高められ、吸気バルブ８，８が
開いた際には燃焼室５内に吸気が効率良く吸入されると
ともに、燃焼室５内に強い渦流が発生し、燃焼効率が高
められる。When the engine speed is low, such as when idling,
Diaphragm actuator 43°440 actuator 51.
52 is pulled by the urging force of return springs 53 and 54, and the slide plate 29 on the first stream side of the tank is slid to the right in FIG. 4, and the slide plate 3θ on the upstream side is slid to the left. be. In this case, as shown in FIG.
4, and the non-opening portion 33 of the slide plate 29 is located exactly above the third intake passage 24 at the right end, and both intake passages 22 and 24 are in a closed state. On the contrary,
Both sliding plates 29° and 30° are installed in the central second intake passage 23
Owing to the overlapping of the zero openings 31.32, only this intake channel 23 is open, and the intake air is ultimately led only through the second intake channel 23 to the intake port 6.6. Therefore, the flow velocity of the intake air is increased, and when the intake valves 8, 8 are opened, the intake air is efficiently drawn into the combustion chamber 5, and a strong vortex is generated within the combustion chamber 5, which improves the combustion efficiency. is enhanced.

スロットル操作にもとづいて１次絞り弁１８が開かれる
と、吸入空気量が増すので検知部２０は制御部２ノに信
号を与える。制御部２１はこの信号にもとづいて電磁弁
４９に作動指令信号を出力し、電磁弁４９が開操作され
る。このため一方のダイヤフラムアクチュエータ４３の
負圧室４７が吸気チャンバ１４に導通されるから、ダイ
ヤフラム４５が撓んで作動子５ノを突出させ、リンクプ
レート５５および駆動軸４０を通じて一方の扇形歯車３
８を矢印入方向に回動させるうそうすると、下流側のス
ライド板２９が摺動室２８内を矢印Ｃ方向にスライドす
るので、第６図および第７図に示したように今まで閉じ
られていた第３の吸気通路２４にスライド板２９の開口
部３１が重なり合いこの吸気通路２４が開かれる。よっ
て吸気は第２の吸気通路２３に加えて第３の吸気通路２
４内も流ノすることになシ、吸気効率が向上する。When the primary throttle valve 18 is opened based on throttle operation, the amount of intake air increases, so the detection section 20 gives a signal to the control section 2. Based on this signal, the control section 21 outputs an operation command signal to the solenoid valve 49, and the solenoid valve 49 is opened. For this reason, the negative pressure chamber 47 of one diaphragm actuator 43 is electrically connected to the intake chamber 14, so that the diaphragm 45 is bent and the actuator 5 protrudes, passing through the link plate 55 and the drive shaft 40 to the one sector gear 3.
8 in the direction of arrow C, the slide plate 29 on the downstream side slides in the direction of arrow C within the sliding chamber 28, so that the slide plate 29 that has been closed until now will slide inside the sliding chamber 28 in the direction of arrow C. The opening 31 of the slide plate 29 overlaps the third intake passage 24, and this intake passage 24 is opened. Therefore, the intake air flows through the third intake passage 2 in addition to the second intake passage 23.
4 will also flow, improving intake efficiency.

壕だ、上記１次絞り弁１８がさらに大きく開かれると、
吸入空気量が一段と増すので制御部２ノは検知部２０か
らの信号にもとづいて、残りの電磁弁５０にも作動指令
信号を出力する。Well, when the primary throttle valve 18 is opened even wider,
Since the amount of intake air increases further, the control section 2 outputs an operation command signal to the remaining solenoid valves 50 based on the signal from the detection section 20.

電磁弁５０が開操作されると他方のダイヤ７ラムアクチ
ユエータ４４の負圧室４８も吸気チャンバ１４に導通さ
れるから、同様に作動子５２が突出されて他の扇形歯車
３９を矢印Ｂ方向に回動させる。そうすると上流側の第
２のスライド板３０が摺動室２８内を逆方向、つまり矢
印り方向にスライドするので、第８図および第９図に示
したように、今まで閉じられていた第１の吸気通路２２
にスライド板３θの開口部３２が重なり合い、このため
両スライド板２９．３０の開口部３１・・・、３２・・
・が完全に重なるので、３本の吸気通路２２，２３．２
４が全て開かれる。よって、通路面積が大幅に増加する
から吸気量が増し、最高出力の向上に寄与する。When the solenoid valve 50 is opened, the negative pressure chamber 48 of the other diamond 7-ram actuator 44 is also connected to the intake chamber 14, so the actuator 52 is similarly protruded and the other sector gear 39 is moved in the direction of arrow B. direction. Then, the second slide plate 30 on the upstream side slides inside the sliding chamber 28 in the opposite direction, that is, in the direction indicated by the arrow, so that the first intake passage 22
The openings 32 of the slide plates 3θ overlap with each other, and therefore the openings 31..., 32... of both slide plates 29, 30 overlap.
・Since they completely overlap, the three intake passages 22, 23.2
All 4 are opened. Therefore, since the passage area increases significantly, the amount of intake air increases, contributing to an increase in maximum output.

このような構成の吸気装置によると、１対のスライド板
２９．３０を夫々独立してスライドさせることにより、
３本の吸気通路２２　、２３゜２４に対する開口部３１
・・・、３２・・・の位置を変化させて、これら吸気通
路２２，２３．２４を開閉するように１７だので、従来
の１枚のスライド板で吸気通路を開閉する構造に比べて
個々のスライド板２９．３０のスライド量が少なくて済
む。特にこの実施例のように３本の吸気通路２２．２３
．２４を備えるものにおいては、各スライド板２９．ｓ
ｏのスライド量は吸気通路２２と２４の幅１個分でよく
、したがって吸気流速の変化を短時間のうちに円滑に移
行させることができるのはもちろん、吸気装置の小型化
を実現できる。According to the intake device having such a configuration, by sliding the pair of slide plates 29 and 30 independently,
Opening 31 for three intake passages 22, 23° 24
..., 32... 17 to open and close these intake passages 22, 23, 24 by changing the positions of the intake passages 22, 23, 24. The amount of sliding of the slide plates 29 and 30 is small. Especially in this embodiment, there are three intake passages 22, 23.
．． 24, each slide plate 29. s
The sliding amount of o can be equal to one width of the intake passages 22 and 24, and therefore, it is possible to smoothly change the intake air flow rate in a short time, and it is also possible to downsize the intake device.

しかも、この構成によれば、作動子５１．５２の往復運
動をスライド板２９．３０に伝えるのに際して、摺動室
２８内にスライド板２９．３０とかみ合う扇形歯車３８
．３９を収容するとともに、この扇形歯車３８．３９が
固定された駆動軸４０．４１を摺動室２８から外方に導
出させ、この導出端部と作動子５１．５２とを作動子５
１．５２の往復運動を回転運動に変換するリンクプレー
ト５５．５６によって連結したから、摺動室２８内をス
ライド板２９．３０が往復動するにも拘わらず、との摺
動室２８を貫通するのは軸回り方向に回動する駆動軸４
０　、４．１のみであり、よって摺動室２８内の気密保
持を容易に行なえる利点がある。Moreover, according to this configuration, when transmitting the reciprocating motion of the actuator 51.52 to the slide plate 29.30, the sector gear 38 that meshes with the slide plate 29.30 in the sliding chamber 28
．． 39, and the drive shaft 40.41 to which this sector gear 38.39 is fixed is led out from the sliding chamber 28, and this lead-out end and the actuator 51.52 are connected to the actuator 5.
Since they are connected by link plates 55 and 56 that convert the reciprocating motion of 1.52 into rotational motion, even though the slide plates 29 and 30 reciprocate within the sliding chamber 28, What does this is the drive shaft 4 that rotates around the axis.
0 and 4.1, which has the advantage that the inside of the sliding chamber 28 can be easily maintained airtight.

なお、本発明は上述した実施例に制約されない。Note that the present invention is not limited to the embodiments described above.

例えば上記実施例では、３本の吸気通路のうち中央の第
２の吸気通路を常時開口させたが、左右両側の第１又は
第３の吸気通路を常時開口させるようにしてもよく、ま
たスライド板は互に逆方向に往復動させるものに限らず
、開口の位置を適宜設定すれば同方向に往復動させるこ
ともできる。For example, in the above embodiment, the central second intake passage out of the three intake passages is always open, but the first or third intake passages on both the left and right sides may be always open, or the slide The plates are not limited to being reciprocated in opposite directions; they can also be reciprocated in the same direction by appropriately setting the positions of the openings.

さらに各スライド板駆動用の駆動軸をスロットルに連動
させ、吸入空気量の流量制御用として利用しても良い。Furthermore, the drive shaft for driving each slide plate may be linked to the throttle and used for controlling the intake air amount.

壕だ、上記実施例ではダイヤフラムアクチュエータを吸
気チャンバ内の負圧によって作動させるようにしたが、
例えば排気圧力を利用しても良いし、かつダイヤフラム
アクチュエータに限らず、電磁式等信の駆動手段を用い
ても良い。In the above example, the diaphragm actuator was actuated by the negative pressure in the intake chamber.
For example, exhaust pressure may be used, and not only a diaphragm actuator but also an electromagnetic drive means may be used.

さらに吸気通路は３本に限らず、２本あるいは４本であ
っても良いとともに、本発明に係る内燃機関は４気筒の
ような多気筒に限らず、単気筒であっても良い。Further, the number of intake passages is not limited to three, but may be two or four, and the internal combustion engine according to the present invention is not limited to a multi-cylinder engine such as four cylinders, but may be a single-cylinder engine.

以上詳述した本発明によれば、絞り弁を複数枚のスライ
ド板から構成するとともに、各スライド板には複数の吸
気通路の少なくとも１つに連なる開口部を形成し、これ
らスライド板を夫々独立して吸気通路を横切る方向にス
ライドさせるようにしたから、従来の１枚のスライド板
で吸気通路を開閉する構造に比べて個々のスライド板の
スライド量が少なくて済み、吸気装置の小形化を実現で
きる。According to the present invention described in detail above, the throttle valve is constituted by a plurality of slide plates, each slide plate is formed with an opening connected to at least one of the plurality of intake passages, and these slide plates are independent of each other. Since the intake passage is slid in the direction across the intake passage, compared to the conventional structure in which the intake passage is opened and closed using a single slide plate, the amount of sliding of each individual slide plate is smaller, and the intake system can be made more compact. realizable.

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

図面は本発明の一実施例を示し、第１図は断面図、第２
図は一部断面して示す平面図、第３図は各スライド板お
よびそのストロークを示す正面図、第４図は第１図中Ｉ
Ｖ−ＩＶ線に沿う矢視図、第５図は第４図中Ｖ−Ｖ線に
沿う断面図、第６図は吸気通路が２個開かれた状態を示
す作動説明図、第７図は、第６図中■−■線に沿う断面
図、第８図は吸気通路が全開の状態を示す作動説明図、
第９図は第８図中ＩＸ−ＩＸ線に沿う断面図である。 ５・・・燃焼室、２２，２３．２４・・・吸気通路、２
５・・・スライド形絞り弁（２次絞り弁）、２９゜３０
・・・スライド板、３１．３２・・・開口部。 出願人代理人　弁理士　鈴　江　武　彦特許庁長″ｒｉ
′　　　行　杉　和　夫　　殿１．事件の表示 特願昭５８　８２５号 ２、発明の名称 内燃１幾関の吸電装置 ３、補正をする者 事件との関係　　　特、ｉ’Ｆ　出願人（ＡＯ７）　　
ヤマハ発動機株式会社 ４、代理人The drawings show one embodiment of the present invention, with FIG. 1 being a sectional view and FIG.
The figure is a partially sectional plan view, Figure 3 is a front view showing each slide plate and its stroke, and Figure 4 is I in Figure 1.
Fig. 5 is a cross-sectional view taken along line V-V in Fig. 4, Fig. 6 is an operation explanatory diagram showing a state in which two intake passages are opened, and Fig. 7 is a view taken along line V-IV. , a sectional view taken along the line ■-■ in Fig. 6, Fig. 8 is an operation explanatory diagram showing the state in which the intake passage is fully open;
FIG. 9 is a sectional view taken along line IX-IX in FIG. 8. 5... Combustion chamber, 22, 23.24... Intake passage, 2
5...Slide type throttle valve (secondary throttle valve), 29°30
...Slide plate, 31.32...Opening. Applicant's agent Patent attorney Takehiko Suzue, Director of the Japan Patent Office
' Line Kazuo Sugi 1. Display of the case Japanese Patent Application No. 1982 825 2, Title of the invention Internal combustion 1 Electric absorption device 3, Person making the amendment Relationship to the case Patent, i'F Applicant (AO7)
Yamaha Motor Co., Ltd. 4, agent

Claims (1)

【特許請求の範囲】[Claims] 単一の燃焼室に複数の吸気通路を連通させ、これら吸気
通路の少なくとも１つをスライド形絞り弁により開閉す
るようにした内燃機関において、上記絞シ弁は複数枚の
スライド板を上記吸気通路を横切る方向に互に独立して
往復動可能に設けて構成するとともに、これら各スライ
ド板には上記吸気通路の少なくとも１つに連なる開口部
を形成し、これらスライド板を夫々独立して往復動させ
ることによシ、上記吸気通路を開閉するようにしたこと
を特徴とする内燃機関の吸気装置。In an internal combustion engine in which a plurality of intake passages are communicated with a single combustion chamber, and at least one of these intake passages is opened and closed by a sliding throttle valve, the throttle valve connects a plurality of slide plates to the intake passage. Each of these slide plates is provided with an opening connected to at least one of the intake passages, and each of these slide plates is configured to be able to independently reciprocate in a transverse direction. An intake system for an internal combustion engine, characterized in that the intake passage is opened and closed by opening and closing the intake passage.