JPH09301271A - Intake device for engine for small planing boat - Google Patents

Intake device for engine for small planing boat

Info

Publication number
JPH09301271A
JPH09301271A JP8121224A JP12122496A JPH09301271A JP H09301271 A JPH09301271 A JP H09301271A JP 8121224 A JP8121224 A JP 8121224A JP 12122496 A JP12122496 A JP 12122496A JP H09301271 A JPH09301271 A JP H09301271A
Authority
JP
Japan
Prior art keywords
intake
engine
carburetor
duct
box
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP8121224A
Other languages
Japanese (ja)
Other versions
JP2754371B2 (en
Inventor
Yoshinobu Tanaka
義信 田中
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.)
Kawasaki Heavy Industries Ltd
Original Assignee
Kawasaki Heavy Industries 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 Kawasaki Heavy Industries Ltd filed Critical Kawasaki Heavy Industries Ltd
Priority to JP8121224A priority Critical patent/JP2754371B2/en
Publication of JPH09301271A publication Critical patent/JPH09301271A/en
Application granted granted Critical
Publication of JP2754371B2 publication Critical patent/JP2754371B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide an intake device for an engine for a small planing boat which improved engine performance based on intake inertia by increasing length of an intake tube efficiently and in which direction between a carburetor and an intake port is not changed and also response of which is not damaged. SOLUTION: An engine mounted in an engine room 10 of a small planing boat 1 is connected with one end of an intake tube 6 and a carburetor 7 is connected with the other end of the intake tube and a base end of an intake duct 9 is connected with an upstream opening of the carburetor 7. The intake duct 9 is inserted into an intake box 8 and a metal mesh shaped frame arrester 8a is disposed nearly vertical center of the intake box 8 and a tip side opening 9a of the intake duct 9 is passed through this frame arrester 8a and projected downward to extend length of the intake duct 9. The intake port 8b is disposed at opposite side(upward) with the frame arrester 8a held between.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、小型(水上)滑走艇用
エンジンの排気装置に関するもので、詳しくは、エンジ
ンの吸気ポートに、吸気管、気化器又は電子燃料噴射
器、吸気ダクト、およびフレームアレスタを備えた吸気
箱が上流側にかけて順に接続された吸気装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust system for a small (waterborne) personal watercraft engine, and more particularly, to an intake pipe, a carburetor or an electronic fuel injector, an intake duct, The present invention relates to an intake device in which intake boxes provided with a flame arrestor are sequentially connected to an upstream side.

【0002】[0002]

【従来の技術】小型滑走艇のエンジンルームに搭載され
るエンジンは、気化器又は電子燃料噴射器(インジェク
ションスロットルボディともいう)の上流側に、金網状
のフレームアレスタ(スパークアレスタともいう)を取
り付けることが義務づけられている。これは、バックフ
ァイヤーのエンジンルーム内への吹き出しを阻止するた
めで、従来は、図4に示すように、気化器21から上流
側に接続された吸気ダクト22が吸気箱23内に挿入さ
れているが、吸気ダクト22の先端はフレームアレスタ
24の手前(上方)に位置し、フレームアレスタ24を
挟んで下方に吸気箱23の吸気口25が設けられてい
る。
2. Description of the Related Art An engine mounted in an engine room of a personal watercraft has a wire mesh frame arrester (also called a spark arrestor) upstream of a carburetor or an electronic fuel injector (also called an injection throttle body). Is required. This is to prevent the backfire from blowing into the engine room. Conventionally, as shown in FIG. 4, an intake duct 22 connected upstream from a carburetor 21 is inserted into an intake box 23. However, the tip of the intake duct 22 is located before (upper) the frame arrester 24, and the intake port 25 of the intake box 23 is provided below the frame arrester 24.

【0003】この種の吸気装置の先行技術に、特開平7
−237588号公報に記載のものがある。この吸気装
置は、2気筒4サイクルエンジンの各吸気ポートに接続
される2本の吸気管をそれぞれ船体の長手方向に折り曲
げて延設し、それらの前端部に気化器と吸気箱を順に接
続した構造を備えている。そして、各吸気管長を従来よ
りも延長することにより、吸気効率を上げてエンジンの
出力を向上しようとするものである。
The prior art of this type of intake device is disclosed in Japanese Patent Application Laid-Open
No. 237588. In this intake device, two intake pipes connected to each intake port of a two-cylinder four-stroke engine are respectively bent and extended in the longitudinal direction of the hull, and a carburetor and an intake box are sequentially connected to their front ends. It has a structure. Then, the length of each intake pipe is made longer than before so as to increase the intake efficiency and improve the output of the engine.

【0004】小型滑走艇の推進手段としてはウォータジ
ェットポンプやスクリューが使用されるが、その駆動用
のエンジンには、従来、2サイクルエンジンが使用され
ていたが、最近、騒音や環境改善の観点から、小型滑走
艇に関しても上記公報に記載のように4サイクルエンジ
ンの使用可能性が検討され始めている。
A water jet pump or a screw is used as a propulsion means for a personal watercraft, and a two-cycle engine has conventionally been used as an engine for driving the water jet pump or a screw. Accordingly, the possibility of using a four-stroke engine has also been studied for small personal watercraft as described in the above-mentioned publication.

【0005】[0005]

【発明が解決しようとする課題】しかしながら、上記し
た公報に記載の吸気装置では、下記のような点で課題が
生じる。すなわち、イ ) 吸気管を延長してその前端部に気化器を取り付ける
ため、エンジンと気化器との距離が大きくなる。このた
め、エンジンの駆動に連動させて気化器を操作するため
のスロットルワイヤーやリンクなどの機構が長くなって
複雑になる。
However, the intake device described in the above-mentioned publication has the following problems. That is, a) Since the intake pipe is extended and the carburetor is attached to the front end thereof, the distance between the engine and the carburetor is increased. For this reason, a mechanism such as a throttle wire and a link for operating the carburetor in conjunction with the driving of the engine becomes long and complicated.

【0006】ロ) 気化器と吸気ポートとの距離が大きく
なるため、エンジンのレスポンスが低下し、出力向上が
十分に図れないおそれがある。
(B) Since the distance between the carburetor and the intake port is increased, the response of the engine is reduced, and the output may not be sufficiently improved.

【0007】ハ) 気化器回りを簡素化するため、気化器
を一か所にまとめる方法があるが、この場合には、各気
筒に接続された吸気管長が不揃いになり、エンジン性能
が十分に引き出せなくなる。
C) In order to simplify the area around the carburetor, there is a method of putting the carburetor in one place, but in this case, the intake pipe lengths connected to the cylinders are not uniform, and the engine performance is not sufficient. I can't withdraw.

【0008】この発明は上述の点に鑑みなされたもの
で、吸気管長を十分に長くして吸気慣性に基づくエンジ
ン性能の向上を図れ、しかも気化器と吸気ポート間の距
離が変わらず、レスポンスを損なわない、小型滑走艇用
エンジンの吸気装置を提供することを目的としている。
The present invention has been made in view of the above points, and it is possible to improve the engine performance based on the intake inertia by making the intake pipe length sufficiently long, and furthermore, the distance between the carburetor and the intake port is not changed and the response is improved. It is an object of the present invention to provide an air intake device for a small planing boat engine that does not impair.

【0009】[0009]

【課題を解決するための手段】上記の目的を達成するた
めにこの発明の小型滑走艇の吸気装置は、a)小型滑走艇
のエンジンルームに搭載されたエンジンの吸気ポート
に、吸気管、気化器又は電子燃料噴射器、吸気ダクト、
およびフレームアレスタを備えた吸気箱が上流側にかけ
て順に接続された小型滑走艇用エンジンの吸気装置にお
いて、b)前記吸気箱内に挿入した前記吸気ダクトの先端
開口側を延長し、前記フレームアレスタを貫通させて一
方へ突出させ、c)前記フレームアレスタを挟んで前記吸
気ダクトの突出側と反対側に、前記吸気箱の吸気口を設
けている。
In order to achieve the above-mentioned object, an air intake device for a personal watercraft according to the present invention comprises: a) an intake pipe, a carburetor, and a gas inlet port of an engine mounted in an engine room of the personal watercraft. Or electronic fuel injector, intake duct,
And an intake device for a small planing boat engine in which an intake box having a flame arrester is sequentially connected to the upstream side, b) extending the tip opening side of the intake duct inserted in the intake box, The air intake port of the air intake box is provided on the side opposite to the projecting side of the air intake duct with the frame arrester interposed therebetween.

【0010】上記の構成を有するこの発明にかかる小型
滑走艇の吸気装置によれば、上記b)の構成により吸気ダ
クトの延長された長さだけ吸気管長が延長されるから、
吸気慣性が高くなることによってエンジンの低速域にお
ける性能が向上する。また吸気ポートと気化器(又は電
子燃料噴射器)との距離は変化しない(短い)から、気
化器の吸気口部への燃料の吸い出しが遅延せず、レスポ
ンスが損なわれない。さらに、上記c)の構成により、吸
気ダクトを延長したにも拘わらず、吸気箱内の吸気口か
ら吸気ダクト入口に至るまでの空気容積(空気量)が十
分に確保されているので、吸気ダクト内への空気の吸引
時に十分な量の空気が円滑に吸引され、優れたレスポン
ス性が得られる。また吸気箱内の吸気口から吸気ダクト
入口に至るまでの吸気通路が従来のそれに比べて複雑に
なり、吸気音が低減される。
According to the intake system for a personal watercraft according to the present invention having the above configuration, the length of the intake pipe is extended by the extended length of the intake duct by the configuration of b).
By increasing the intake inertia, the performance of the engine in a low speed range is improved. Further, since the distance between the intake port and the carburetor (or the electronic fuel injector) does not change (is short), the suction of fuel to the intake port of the carburetor is not delayed, and the response is not impaired. Furthermore, due to the configuration of c), the air volume (air amount) from the air inlet in the air intake box to the air inlet of the air intake duct is sufficiently ensured despite the air intake duct being extended. A sufficient amount of air is smoothly sucked when air is sucked into the inside, and excellent responsiveness is obtained. Further, the intake passage from the intake port in the intake box to the intake duct inlet is more complicated than the conventional one, and the intake noise is reduced.

【0011】請求項2記載のように、前記吸気ダクトが
複数の場合に、それらのうちの一部を延長するととも
に、前記吸気ダクトの全てを前記フレームアレスタを貫
通させることができる。
When the number of the intake ducts is plural, a part of them can be extended and all of the intake ducts can pass through the frame arrester.

【0012】請求項2に記載の吸気装置によれば、吸気
ダクトの空気吸込位置が吸気ダクトの長さ方向にずれて
いるから、空気吸込時に干渉しにくく吸込効率が向上
し、エンジンの性能がアップする。
According to the second aspect of the present invention, since the air suction position of the air intake duct is displaced in the length direction of the air intake duct, the air intake position is less likely to interfere and the air intake efficiency is improved, and the engine performance is improved. Up.

【0013】[0013]

【発明の実施の形態】以下、本発明の小型滑走艇の吸気
装置についてその実施の形態を図面に基づいて説明す
る。
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an air intake device for a personal watercraft according to the present invention.

【0014】図1および図2は本発明の一実施例を示
す。この例は小型滑走艇とこれに搭載される4サイクル
エンジンの吸気装置に関するもので、図1は小型滑走艇
のエンジンルーム内を示すエンジンなどを後方から見た
縦断面図である。図2は図1の吸気装置を示す正面視断
面図である。
FIG. 1 and FIG. 2 show an embodiment of the present invention. This example relates to a personal watercraft and an intake device for a four-stroke engine mounted on the personal watercraft. FIG. 1 is a longitudinal sectional view of an engine and the like in an engine room of the personal watercraft viewed from the rear. FIG. 2 is a front sectional view showing the intake device of FIG.

【0015】小型滑走艇1のエンジン2としては、図1
に示すように、4サイクル・直列4気筒のものを搭載し
ている。エンジン2の運転時の振動が船体に直接伝わら
ないように、船底ハル3の上にダンパー4を介して支持
パイプ4aを架設し、この支持パイプ4a(長手方向に
複数本配置する)にエンジン2を取り付けている。エン
ジン2の上部にはシリンダヘッド2aがあり、それより
下にシリンダ2bやクランクケース2c・オイルパン2
dが備わっている。シリンダヘッド2aのうちには吸気
ポート2eと排気ポート2fがあり、各ポート2e・2
fを開閉するバルブとともに、カムやタイミングチェー
ンなどの動弁機構2gが組み込まれ、点火プラグ2hも
取り付けられている。吸気ポート2eの上流側には吸気
箱8や気化器7などからなる吸気装置5が接続され、排
気ポート2fの下流側には排気管(排気マニホールド)
11やサイレンサー(消音器)などの排気装置12が接
続されている。また、シリンダ2bの内側には、クラン
ク軸2jに連結されたピストン2kが上下に摺動可能な
ように配置されており、クランク軸2jは、軸受を介し
てクランクケース2cにより支えられている。そしてク
ランクケース2cの最低部分には、オイルを溜めるオイ
ルパン2dが密に取り付けてあり、その窪みになった下
部に円筒状のストレーナ2mが配置され、それが給油ポ
ンプ(図示せず)に接続されている。なお、クランク軸
2jには発電機やスタータなどが接続されている。
As the engine 2 of the personal watercraft 1, FIG.
As shown in the figure, a four-cycle, in-line four-cylinder engine is mounted. A support pipe 4a is installed on the bottom hull 3 via a damper 4 so that vibration during operation of the engine 2 is not directly transmitted to the hull, and the engine 2 is mounted on the support pipe 4a (a plurality of pipes are arranged in the longitudinal direction). Is installed. Above the engine 2, there is a cylinder head 2a, below which a cylinder 2b, a crankcase 2c and an oil pan 2
d is provided. The cylinder head 2a has an intake port 2e and an exhaust port 2f.
A valve mechanism 2g such as a cam and a timing chain is incorporated with a valve that opens and closes f, and an ignition plug 2h is also attached. An intake device 5 including an intake box 8 and a carburetor 7 is connected upstream of the intake port 2e, and an exhaust pipe (exhaust manifold) is located downstream of the exhaust port 2f.
An exhaust device 12 such as 11 or a silencer (silencer) is connected. A piston 2k connected to a crankshaft 2j is arranged inside the cylinder 2b so as to be slidable up and down, and the crankshaft 2j is supported by a crankcase 2c via a bearing. An oil pan 2d for storing oil is densely attached to the lowest part of the crankcase 2c, and a cylindrical strainer 2m is arranged in the recessed lower part, which is connected to an oil supply pump (not shown). Have been. Note that a generator, a starter, and the like are connected to the crankshaft 2j.

【0016】小型滑走艇1のエンジンルーム10内に
は、以上のように4サイクルエンジン2を、図1のとお
り推進用の機関として搭載している。すなわち、4気筒
のエンジン2をいわゆる縦置き(クランク軸2jを船体
の前後方向に向け、シリンダ2bをそれに沿って並べ
る)としてそのクランク軸2jを船体幅の中央に位置さ
せるとともに、当該エンジン2の全シリンダ2bをエン
ジンルーム10内の右側(進行方向右側)へ傾斜させ、
その反傾斜側であるエンジンルーム10内の左側に吸気
装置5を配置している。また排気装置12のうち図示し
ていないサイレンサーや水マフラなどは、エンジンルー
ム10内のうちエンジン2の位置よりも後方に配置して
いる。
In the engine room 10 of the personal watercraft 1, the four-stroke engine 2 is mounted as a propulsion engine as shown in FIG. That is, the four-cylinder engine 2 is placed in a so-called vertical position (the crankshaft 2j is oriented in the longitudinal direction of the hull, and the cylinders 2b are arranged along the same), and the crankshaft 2j is positioned at the center of the hull width. All the cylinders 2b are inclined rightward (rightward in the traveling direction) in the engine room 10,
The intake device 5 is arranged on the left side in the engine room 10 on the opposite side of the inclination. Further, a silencer, a water muffler, and the like (not shown) in the exhaust device 12 are arranged in the engine room 10 rearward of the position of the engine 2.

【0017】エンジン2の吸気ポート2eに吸気管6の
一端を接続し、他端に気化器7を接続し、気化器7の上
流側開口に吸気ダクト9の基端を接続している。吸気ダ
クト9は先端がラッパ状に開口し、吸気箱8内に挿入さ
れている。吸気箱8内の上下方向のほぼ中間に金網状の
フレームアレスタ8aが配設され、このフレームアレス
タ8aを貫通して吸気ダクト9の先端側開口9aを下方
に突出させて吸気ダクト9の管長を延長している。この
ため、従来の吸気箱の吸気口の位置(図4参照)では、
吸気口8bと吸気ダクト9の先端側開口9aとの間にフ
レームアレスタ8aが存在しなくなり、また吸気ダクト
9の開口9aと吸気口8bとが近くなり過ぎて、吸込空
気量を十分に確保できなくなるおそれがある。そこで、
吸気口8bをフレームアレスタ8aを挟んで反対側(上
方)に設けている。このように吸気口8bを上方に移動
したことにより、吸気箱8内に水が侵入しにくくなり、
また仮に吸気箱8内に水が侵入した状態で小型滑走艇1
が反転しても、吸気箱8内の水が吸気口8bから排出さ
れ、吸気ダクト9内には入らない。
One end of an intake pipe 6 is connected to an intake port 2e of the engine 2, a carburetor 7 is connected to the other end, and a base end of an intake duct 9 is connected to an upstream opening of the carburetor 7. The intake duct 9 has a front end opened in a trumpet shape, and is inserted into the intake box 8. A wire net-like frame arrester 8a is disposed substantially at the center of the intake box 8 in the up-down direction. It is extended. Therefore, at the position of the intake port of the conventional intake box (see FIG. 4),
The frame arrester 8a does not exist between the intake port 8b and the front end opening 9a of the intake duct 9, and the opening 9a of the intake duct 9 is too close to the intake port 8b, so that a sufficient amount of intake air can be secured. It may disappear. Therefore,
The intake port 8b is provided on the opposite side (upper side) of the frame arrester 8a. By moving the intake port 8b upward in this way, it becomes difficult for water to enter the intake box 8,
Also, if the water has entered the intake box 8, the personal watercraft 1
Is reversed, the water in the suction box 8 is discharged from the suction port 8b and does not enter the suction duct 9.

【0018】上記のように構成された本実施例の吸気装
置5によれば、吸気ダクト9が延長された分だけ吸気管
全体の長さが延びて吸気慣性が上がり、とくに低回転域
におけるエンジン性能が向上する。しかも、気化器7と
吸気ポート2eの距離は従来と変わらないから、シリン
ダ2b内への燃料ガスの吸込効率や吸込時のレスポンス
は低下しない。また気化器7とエンジン2間の距離も変
わらず短いから、エンジン2と気化器7とを連動するた
めの図示していないスロットルワイヤーやリンク等が複
雑にならない。
According to the intake device 5 of the present embodiment configured as described above, the entire length of the intake pipe is extended by the extension of the intake duct 9, so that the intake inertia is increased. Performance is improved. In addition, since the distance between the carburetor 7 and the intake port 2e is not different from the conventional one, the efficiency of suction of the fuel gas into the cylinder 2b and the response at the time of suction do not decrease. In addition, since the distance between the carburetor 7 and the engine 2 remains unchanged, the throttle wires and links (not shown) for linking the engine 2 and the carburetor 7 do not become complicated.

【0019】図3は本発明の吸気装置の他の実施例を示
すものである。図3に示すように、本例の吸気装置5’
では、4本の吸気ダクト9のうち左右の吸気ダクト9’
を他の2本の吸気ダクト9に比べて短くして、空気の吸
込位置をずらしている。これに伴って、左右のフレーム
アレスタ8aの位置も上方にずらして吸気ダクト9’の
先端開口9a’を下方へ突出させている。なお、他の吸
気ダクト9に比べて短くする吸気ダクト9’は、空気の
吸込がほぼ同時に(連続して)行われる吸気ダクトが隣
接している場合の一方とするから、とくに左右に限定さ
れない。その他の構成については共通するので、共通す
る部材は同一の符号を用いて示し、説明を省略する。
FIG. 3 shows another embodiment of the intake device of the present invention. As shown in FIG. 3, the intake device 5 'of this example
Then, of the four intake ducts 9, the left and right intake ducts 9 ′
Is made shorter than the other two intake ducts 9 to shift the air suction position. Along with this, the positions of the left and right frame arresters 8a are also shifted upward, so that the tip openings 9a 'of the intake ducts 9' project downward. Note that the intake duct 9 ', which is shorter than the other intake ducts 9, is one of the cases where the intake ducts in which air is sucked almost simultaneously (continuously) are adjacent to each other, and is not particularly limited to the left and right. . Since other configurations are common, common members are denoted by the same reference numerals and description thereof is omitted.

【0020】また、上記実施例では気化器7を備えてい
るが、気化器7に代えて電子燃料噴射器を使用する場合
にも同様に適用できることはいうまでもない。
In the above embodiment, the carburetor 7 is provided. However, it goes without saying that the present invention can be similarly applied to a case where an electronic fuel injector is used in place of the carburetor 7.

【0021】[0021]

【発明の効果】以上説明したことから明らかなように、
本発明の小型滑走艇の吸気装置には、次のような効果が
ある。
As is apparent from the above description,
The air intake device for a personal watercraft according to the present invention has the following effects.

【0022】1) 吸気ダクトの延長によって吸気管全体
の長さが延びるから、吸気慣性が上がってエンジンの低
速域における性能が向上する。また吸気ポートと気化器
(又は電子燃料噴射器)間の距離は変化しない(短い)
から、シリンダ内への燃料ガスの吸い込みが遅れず、レ
スポンスが損なわれない。さらに吸気箱内の吸気口から
吸気ダクト入口に至るまでの空気容積が十分に確保され
ているので、吸気時に十分な量の空気が円滑に吸引さ
れ、優れたレスポンス性が得られる。さらにまた吸気箱
内の吸気口から吸気ダクト入口に至るまでの吸気通路が
従来のそれに比べて複雑になるので、吸気音が低減され
る。
1) Since the entire length of the intake pipe is extended by extending the intake duct, the inertia of the intake is increased, and the performance of the engine in a low speed range is improved. The distance between the intake port and the carburetor (or electronic fuel injector) does not change (short)
Therefore, the suction of the fuel gas into the cylinder is not delayed, and the response is not impaired. Furthermore, a sufficient volume of air from the intake port in the intake box to the intake duct entrance is ensured, so that a sufficient amount of air is smoothly sucked in during intake and excellent responsiveness is obtained. Furthermore, since the intake passage from the intake port in the intake box to the intake duct inlet is more complicated than the conventional one, intake noise is reduced.

【0023】2) 請求項2記載の吸気装置では、吸気ダ
クトの吸込位置がその長さ方向にずれているから、隣接
する吸気ダクトが空気吸込時に干渉しにくく、吸込効率
が向上し、エンジンの性能が十分に発揮される。
2) In the intake device according to the second aspect, since the intake position of the intake duct is shifted in the longitudinal direction, adjacent intake ducts are unlikely to interfere with each other at the time of air intake, the intake efficiency is improved, and the engine efficiency is improved. Performance is fully demonstrated.

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

【図1】本発明の実施例にかかる吸気装置を備えた小型
滑走艇のエンジンルーム内を示す、エンジンなどを後方
から見た縦断面図である。
FIG. 1 is a longitudinal sectional view showing the inside of an engine room of a personal watercraft equipped with an intake device according to an embodiment of the present invention, when an engine and the like are viewed from behind.

【図2】図1の吸気装置を示す正面視断面図である。2 is a front sectional view showing the intake device of FIG. 1. FIG.

【図3】図3は本発明の吸気装置の他の実施例を示すも
ので、図3(a)は図3(b)のA−A線断面図、図3(b)
は正面視断面図である。
3 shows another embodiment of the intake device of the present invention. FIG. 3 (a) is a sectional view taken along line AA of FIG. 3 (b), and FIG. 3 (b).
FIG.

【図4】図4は従来の吸気装置における吸気箱を示すも
ので、図4(a)は側方視断面図、図4(b)は図4(a)の
正面視断面図である。
4A and 4B show an intake box in a conventional intake device. FIG. 4A is a side sectional view, and FIG. 4B is a front sectional view of FIG. 4A.

【符号の説明】[Explanation of symbols]

1 小型滑走艇 2 4サイクルエンジン 5・5’吸気装置 6 吸気管 7 気化器 8 吸気箱 8aフレームアレスタ 8b吸気口 9・9’吸気ダクト 10 エンジンルーム 1 small planing boat 2 4 cycle engine 5.5 'intake system 6 intake pipe 7 carburetor 8 intake box 8a flame arrester 8b intake port 9.9' intake duct 10 engine room

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 小型滑走艇のエンジンルームに搭載され
たエンジンの吸気ポートに、吸気管、気化器又は電子燃
料噴射器、吸気ダクト、およびフレームアレスタを備え
た吸気箱が上流側にかけて順に接続された小型滑走艇用
エンジンの吸気装置において、 前記吸気箱内に挿入した前記吸気ダクトの先端開口側を
延長し、前記フレームアレスタを貫通させて一方へ突出
させ、 前記フレームアレスタを挟んで前記吸気ダクトの突出側
と反対側に、前記吸気箱の吸気口を設けたことを特徴と
する小型滑走艇用エンジンの吸気装置。
An intake box provided with an intake pipe, a carburetor or an electronic fuel injector, an intake duct, and a frame arrester is connected to an intake port of an engine mounted in an engine room of the personal watercraft in an upstream order. In the air intake device for a personal watercraft engine, the front end opening side of the air intake duct inserted into the air intake box is extended, penetrates the frame arrester and protrudes to one side, and the air intake duct is sandwiched by the frame arrester. An intake device for an engine for a personal watercraft, wherein an intake port of the intake box is provided on a side opposite to a protruding side of the engine.
【請求項2】 前記吸気ダクトが複数の場合に、それら
のうちの一部を延長するとともに、前記吸気ダクトの全
てを前記フレームアレスタを貫通させた請求項1記載の
小型滑走艇用エンジンの吸気装置。
2. An air intake system for a personal watercraft engine according to claim 1, wherein when there are a plurality of said intake ducts, a part of them is extended, and all of said intake ducts pass through said frame arrester. apparatus.
JP8121224A 1996-05-16 1996-05-16 Aircraft intake system for small planing boat engines Expired - Fee Related JP2754371B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8121224A JP2754371B2 (en) 1996-05-16 1996-05-16 Aircraft intake system for small planing boat engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8121224A JP2754371B2 (en) 1996-05-16 1996-05-16 Aircraft intake system for small planing boat engines

Publications (2)

Publication Number Publication Date
JPH09301271A true JPH09301271A (en) 1997-11-25
JP2754371B2 JP2754371B2 (en) 1998-05-20

Family

ID=14805979

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8121224A Expired - Fee Related JP2754371B2 (en) 1996-05-16 1996-05-16 Aircraft intake system for small planing boat engines

Country Status (1)

Country Link
JP (1) JP2754371B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6312299B1 (en) * 1998-12-10 2001-11-06 Yamaha Hatsudoki Kabushiki Kaisha Induction system for watercraft engine
US6435924B2 (en) 1999-12-09 2002-08-20 Sanshin Kogyo Kabushiki Kaisha Air induction system for small watercraft
US7232351B2 (en) * 2001-10-30 2007-06-19 Honda Giken Kogyo Kabushiki Kaisha Personal watercraft

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3995433B2 (en) 2001-07-19 2007-10-24 本田技研工業株式会社 Dry sump engine for small planing boat

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6312299B1 (en) * 1998-12-10 2001-11-06 Yamaha Hatsudoki Kabushiki Kaisha Induction system for watercraft engine
US6435924B2 (en) 1999-12-09 2002-08-20 Sanshin Kogyo Kabushiki Kaisha Air induction system for small watercraft
US6623321B2 (en) 1999-12-09 2003-09-23 Yamaha Marine Kabushiki Kaisha Air induction system for small watercraft
US7232351B2 (en) * 2001-10-30 2007-06-19 Honda Giken Kogyo Kabushiki Kaisha Personal watercraft

Also Published As

Publication number Publication date
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