JPH0729631B2 - Vehicle exhaust system - Google Patents
Vehicle exhaust systemInfo
- Publication number
- JPH0729631B2 JPH0729631B2 JP61020149A JP2014986A JPH0729631B2 JP H0729631 B2 JPH0729631 B2 JP H0729631B2 JP 61020149 A JP61020149 A JP 61020149A JP 2014986 A JP2014986 A JP 2014986A JP H0729631 B2 JPH0729631 B2 JP H0729631B2
- Authority
- JP
- Japan
- Prior art keywords
- engine
- vehicle body
- spark plug
- expansion pipe
- exhaust expansion
- 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.)
- Expired - Fee Related
Links
Landscapes
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Description
【発明の詳細な説明】 (産業上の利用分野) 本発明は、車体中央付近に車体幅方向に並設された2つ
の気筒を有する2サイクルエンジンを搭載し、車体上部
に跨座式運転シートを配設した前輪2個付きの3、4輪
の小型の車輛における排気装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention mounts a two-cycle engine having two cylinders arranged side by side in the vehicle width direction in the vicinity of the center of a vehicle body, and has a straddle-type operation seat above the vehicle body. The present invention relates to an exhaust device for a small vehicle having three or four wheels with two front wheels provided with a.
(発明の背景) 車体中央付近にエンジンを、また車体上部に跨座式運転
シートをそれぞれ配設した前輪付きの3、4輪の小型の
車輛が従来よりある。この種の車輛で、エンジンを2つ
の気筒が車体幅方向に並設された2サイクルエンジンと
した場合には、エンジン性能を向上させるために各気筒
毎に独立に排気膨張管を設ける必要がある。この排気膨
張管はその径が大きく長いため、エンジンの前方からエ
ンジンの下方あるいは両側方の低い位置を通したので
は、路面の障害物が排気膨張管に当たり易くなる。また
エンジン上部の両側方を通したのでは、エンジン上部の
両側方が左右の排気膨張管で塞がれることになり、シリ
ンダ上面の点火栓の着脱作業が困難になるという問題が
生じる。(Background of the Invention) There have conventionally been small vehicles having three or four wheels with front wheels in which an engine is arranged near the center of the vehicle body and a straddle-type driving seat is arranged above the vehicle body. In this type of vehicle, when the engine is a two-cycle engine in which two cylinders are arranged side by side in the vehicle width direction, it is necessary to independently provide an exhaust expansion pipe for each cylinder in order to improve engine performance. . Since the diameter of the exhaust expansion pipe is large and long, obstacles on the road surface are likely to hit the exhaust expansion pipe when the exhaust expansion pipe is passed from the front of the engine to a lower position on the lower side or both sides of the engine. Further, if the engine is passed through both sides of the upper part of the engine, both sides of the upper part of the engine are blocked by the left and right exhaust expansion pipes, which makes it difficult to attach and remove the spark plug on the upper surface of the cylinder.
(発明の目的) 本発明はこのような事情に鑑みなさたれたものであり、
車体幅方向の2つの気筒を有する2サイクルエンジンを
車体中央付近に搭載したにもかかわらず、路面の障害物
が当たって排気膨張管を傷めるおそれが無く、排気膨張
管の冷却性も良い、シリンダ上面の点火栓の着脱作業性
も良い車輛の排気装置を提供することを目的とする。(Object of the Invention) The present invention has been made in view of such circumstances,
Although the two-cycle engine having two cylinders in the width direction of the vehicle body is mounted near the center of the vehicle body, there is no risk of the exhaust expansion pipe being damaged by an obstacle on the road surface, and the cooling performance of the exhaust expansion pipe is good. It is an object of the present invention to provide an exhaust system for a vehicle, which has good workability for attaching and detaching a spark plug on the upper surface.
(発明の構成) 本発明によればこの目的は、2つの前輪と、車体中央付
近に搭載され車体幅方向に並設された2つの気筒にそれ
ぞれ車体両外側方へ着脱する点火栓を有する2サイクル
エンジンと、車体上部に配設された跨座式運転シートと
を備える車輛において、前記エンジンの前方から側面視
前記両前輪と重なるように両前輪間に進入されエンジン
の上側方を通って後方へのびる左右一対の排気膨張管を
備え、これら両排気膨張管の最大径部を前記エンジンの
前方に位置させ、前記エンジン上部の少なくとも点火栓
より後方で前記排気膨張管の上縁をシリンダ上面付近に
位置させて前記排気膨張管の上方に車体外側方に向って
開く左右一対の点火栓着脱空間を形成したことを特徴と
する車輛の排気装置、により達成される。(Structure of the Invention) According to the present invention, the object is to have two front wheels and spark plugs that are attached to and detached from both sides of the vehicle body in two cylinders mounted near the center of the vehicle body and arranged in parallel in the vehicle body width direction. In a vehicle including a cycle engine and a straddle-type driving seat arranged on an upper part of a vehicle body, a front side of the engine is inserted between both front wheels so as to overlap with the both front wheels in a side view, and a rear side is passed through an upper side of the engine. A pair of left and right exhaust expansion pipes extending to each other are provided, the maximum diameter portions of these exhaust expansion pipes are located in front of the engine, and the upper edge of the exhaust expansion pipe is near the upper surface of the cylinder behind at least the spark plug at the upper part of the engine. And a pair of left and right spark plug attachment / detachment spaces which are located above the exhaust expansion pipe and open toward the outer side of the vehicle body.
(実施例) 第1図は本発明の一実施例である不整地走行用4輪車の
側面図、第2図はその要部の平面図、第3図は膨張管を
第1図におけるIII−III線で断面してその配置を示す正
面図である。(Embodiment) FIG. 1 is a side view of a four-wheeled vehicle for traveling on rough terrain, which is an embodiment of the present invention, FIG. 2 is a plan view of a main portion thereof, and FIG. 3 is an expansion pipe in FIG. FIG. 3 is a front view showing a cross section taken along line III-III.
これらの図で符号10は車体フレームであり、左右一対の
下チューブ12,12と、下チューブ12の前後端に結合され
上方へ凸となるように折曲された左右一対の上チューブ
14,14と、上チューブ14の上後部から後方へのびる左右
一対のシートレール16,16と、バックチューブ18,18と、
両下チューブ12,12をつなぐクロスチューブ20,22,24
と、両上チューブ14,14をつなぐクロスチューブ26,28,3
0,32と、上下クロスチューブ22,28をつなぐ左右一対の
ダウンチューブ34,34と、クロスチューブ26と下チュー
ブ12とをつなぐ左右一対の前立チューブ36(一方のみ図
示)とを備える。ダウンチューブ34,34は第3図に示す
ように上部でその間隙が狭くなっている。In these drawings, reference numeral 10 denotes a body frame, which is a pair of left and right lower tubes 12, 12 and a pair of left and right upper tubes which are connected to the front and rear ends of the lower tube 12 and are bent so as to be convex upward.
14,14, a pair of left and right seat rails 16,16 extending rearward from the upper rear portion of the upper tube 14, and back tubes 18,18,
Cross tube 20,22,24 connecting both lower tubes 12,12
And cross tubes 26,28,3 that connect both upper tubes 14,14
0, 32, a pair of left and right down tubes 34, 34 connecting the upper and lower cross tubes 22, 28, and a pair of left and right upright tubes 36 (only one shown) connecting the cross tube 26 and the lower tube 12. As shown in FIG. 3, the down tubes 34, 34 have a narrow gap at the upper portion.
38は左右一対の前緩衝器(一方のみ図示)であり、その
上端は上チューブ14に支持され、その下端はロアアーム
40により上下動自在に保持されている。各緩衝器38の下
端には左右一対の前輪42(一方のみ図示)が操舵可能に
取付けられ、ストラット型前輪独立懸架装置が形成され
る。44は操向軸、46は操向バーハンドルである。38 is a pair of left and right front shock absorbers (only one is shown), the upper end of which is supported by the upper tube 14, and the lower end of which is the lower arm.
It is held vertically by 40. A pair of left and right front wheels 42 (only one of which is shown) is steerably attached to the lower end of each shock absorber 38 to form a strut-type front wheel independent suspension device. Reference numeral 44 is a steering shaft, and 46 is a steering bar handle.
48はリヤアームであり、その前端は車体フレーム10に上
下揺動自在に軸着され、その後端に回転自在に保持され
た後輪軸50の左右端にはそれぞれ後輪52(一方のみ図
示)が固定されている。このリヤアーム48はリンク54、
56を介して後緩衝器58により下方への復帰力が付与され
ている。これら前輪42および後輪52には幅広超低圧タイ
ヤ(いわゆるバルーンタイヤ)が装着されている。48 is a rear arm, the front end of which is pivotally attached to the body frame 10 so as to be vertically swingable, and rear wheels 52 (only one of which is shown) are fixed to the left and right ends of a rear wheel shaft 50 which is rotatably held at the rear end thereof. Has been done. This rear arm 48 has a link 54,
A rear shock absorber 58 provides a downward restoring force via 56. Wide ultra-low pressure tires (so-called balloon tires) are mounted on the front wheels 42 and the rear wheels 52.
60は車体の中央付近に搭載された水令式2サイクル2気
筒エンジンである。このエンジン60は車体幅方向に並設
された2つの気筒を備え、各気筒を含むシリンダ62はク
ランクケース64から斜め上前方へ起立している。このシ
リンダ62の後面には2つの気化器66、66が車体幅方向に
並設されている。The 60 is a water-operated two-cycle two-cylinder engine mounted near the center of the vehicle body. The engine 60 includes two cylinders arranged side by side in the vehicle body width direction, and a cylinder 62 including each cylinder stands obliquely upward and forward from a crankcase 64. On the rear surface of the cylinder 62, two carburetors 66, 66 are arranged side by side in the vehicle width direction.
68,68は左右一対の排気膨張管である。エンジン60の各
気筒の排気口はシリンダ前面にあって、左右のダウンチ
ューブ34,34間から斜め下前方を指向して開口してい
る。膨張管68、68はこれら排気口に接続され、ダウンチ
ューブ34,34間から斜め下前方にのび、エンジン60の前
方で上方へ立上った後エンジン60の上部側方を通り後方
へのびている。これら両排気膨張管68、68は第1図から
明らかなように、両前輪42、42の間へ進入し、側面視両
前輪42、42と重ねるようにしてその長さを十分に確保し
ている。ここに両膨張管68,68の最大径部A、Aはエン
ジン60の前方に位置し、その下流側はエンジン60の側方
で次第に縮径し、上チューブ14,14の間を前後方向に通
る排気管70,70に接続されている。この排気管70,70の下
流側はマフラー72,72に接続されている。68 and 68 are a pair of left and right exhaust expansion pipes. The exhaust port of each cylinder of the engine 60 is located on the front surface of the cylinder, and is open obliquely downward and forward from between the left and right down tubes 34, 34. The expansion pipes 68, 68 are connected to these exhaust ports, extend obliquely downward and forward from between the down tubes 34, 34, rise upward in front of the engine 60, and then pass rearward through the upper side of the engine 60. . As is apparent from FIG. 1, the exhaust expansion pipes 68, 68 enter between the front wheels 42, 42 and overlap with the front wheels 42, 42 in a side view to secure a sufficient length. There is. Here, the maximum diameter portions A, A of both the expansion pipes 68, 68 are located in front of the engine 60, and the downstream side thereof is gradually reduced in diameter laterally of the engine 60, so that the space between the upper tubes 14, 14 extends in the front-rear direction. It is connected to the exhaust pipes 70, 70 passing through. Downstream sides of the exhaust pipes 70, 70 are connected to mufflers 72, 72.
第1、2図で74,74はシリンダ62の上面に取付けられた
点火栓である。前記各膨張管68,68は第1図に明らかな
ように、この点火栓74,74より後方において膨張管68,68
の上縁がシリンダ62の上面より下方に位置する。また上
チューブ14はシリンダ62の上面との間に十分大きな間隙
を有する。この結果エンジン60の上部の少なくとも点火
栓74より後方には、車体の左右の外側方に向って開く点
火栓着脱空間B,Bが形成される。In FIGS. 1 and 2, 74 and 74 are spark plugs attached to the upper surface of the cylinder 62. As is apparent from FIG. 1, the expansion tubes 68, 68 are located behind the spark plugs 74, 74.
The upper edge of the cylinder 62 is located below the upper surface of the cylinder 62. Further, the upper tube 14 has a sufficiently large gap with the upper surface of the cylinder 62. As a result, spark plug attachment / detachment spaces B, B that open toward the left and right outer sides of the vehicle body are formed at least above the spark plug 74 in the upper portion of the engine 60.
第1図で76は操向軸44の前方に配設されたラジエタであ
り、このラジエタ76はエンジン60の冷却液を冷却するも
のである。78は前後方向に長い跨座式運転シートであ
り、車体の上部すなわちシートレール16の上方から上チ
ューブ14の後部上方にかけて位置する。80、80は左右一
対の足置台であり、エンジン60の下側方に位置するよう
に下チューブ12、12に固定されている。また82は前輪42
を覆う前フェンダ、84は後輪52を覆う後フェンダ、86は
燃料タンク(図示せず)を覆うタンクカバーである。In FIG. 1, reference numeral 76 denotes a radiator disposed in front of the steering shaft 44, and the radiator 76 cools the cooling fluid of the engine 60. Reference numeral 78 denotes a straddle-type operation seat that is long in the front-rear direction, and is located above the vehicle body, that is, from above the seat rail 16 to above the rear portion of the upper tube 14. Reference numerals 80, 80 denote a pair of left and right footrests, which are fixed to the lower tubes 12, 12 so as to be located below the engine 60. Also 82 is the front wheel 42
Is a front fender that covers the rear wheel 52, 84 is a rear fender that covers the rear wheel 52, and 86 is a tank cover that covers a fuel tank (not shown).
運転者は第1図に示すように足置台80、80に両足を置い
て運転シート78に着座する。排気膨張管68の最大径部A
はエンジン60の前方に位置し、エンジン60の上部側方で
縮径している。このため最大径部Aは運転者の足より前
方に大きく離れることになり、またエンジン60の側方に
おける膨張管68の側方への突出量も小さくなる。As shown in FIG. 1, the driver places both feet on the footrests 80, 80 and sits on the driver's seat 78. Maximum diameter A of exhaust expansion pipe 68
Is located in front of the engine 60 and has a reduced diameter on the upper side of the engine 60. Therefore, the maximum diameter portion A is largely separated from the driver's foot, and the lateral projection amount of the expansion pipe 68 on the side of the engine 60 is also small.
また排気膨張管68,68は、点火栓74の後方においてシリ
ンダ62上面より下方に位置し、シリンダ62の上部側方に
車体外側方に開く左右一対の点火栓着脱空間B,Bを形成
したから、この空間B,Bからレンチ等の工具を入れて点
火栓74,74を着脱できる。Further, since the exhaust expansion pipes 68, 68 are located below the upper surface of the cylinder 62 behind the spark plug 74, and form a pair of left and right spark plug attachment / detachment spaces B, B that open to the outside of the vehicle body on the upper side of the cylinder 62. The spark plugs 74, 74 can be attached and detached by inserting a tool such as a wrench from the spaces B, B.
本実施例ではエンジン60は2気筒でるが、本発明は前シ
リンダに2気筒を有するV型3、4気筒の2サイクルエ
ンジンの場合にも適用でき、このようなものも包含す
る。In the present embodiment, the engine 60 has two cylinders, but the present invention can be applied to the case of a V-type three or four cylinder two-cycle engine having two cylinders in the front cylinder, and includes such one.
また2つの前輪42、42の間を利用して排気膨張管を両前
輪間に入るようにエンジンから前方へ大きく膨出させる
ことができ、エンジン性能を最大限引き出し得る大容積
の膨張管とすることが可能となる。In addition, the exhaust expansion pipe can be greatly expanded forward from the engine so as to be located between the front wheels by utilizing the space between the two front wheels 42, 42, and the expansion pipe has a large volume capable of maximizing the engine performance. It becomes possible.
(発明の効果) 本発明は以上のように、左右一対の排気膨張管をエンジ
ンの前方からエンジンの上側方を通って後方にのびるよ
うに配設したから、排気膨張管をエンジンの下方付近に
配置する場合のように路面の障害物が排気膨張管に当た
るおそれがなく、障害物により排気膨張管を傷める心配
がない。(Effects of the Invention) As described above, according to the present invention, the pair of left and right exhaust expansion pipes are arranged so as to extend from the front of the engine to the rear through the upper side of the engine. There is no risk that an obstacle on the road surface will hit the exhaust expansion pipe as in the case of disposing, and there is no concern that the exhaust expansion pipe will be damaged by the obstacle.
また排気膨張管を両前輪の間に進入させることにより、
最大径部をエンジンより前方に位置させ、少くとも点火
栓より後方で径を小さくして排気膨張管の上縁をシリン
ダの上面付近に位置させて車体外側方に開く左右一対の
点火栓着脱空間を形成することが可能になる。このため
点火栓の着脱作業性が良好になる。さらに排気膨張管を
左右の前輪間に進入させるから十分に長くでき、エンジ
ン性能を最大限引き出し得る大容量の膨張管とすること
が可能である。さらにまた両前輪間の空間を利用して走
行風を排気膨張管に導き、排気膨張管の冷却性を向上さ
せることも可能である。また少くとも点火栓より後方で
排気膨張管の上縁をシリンダの上面付近に位置させて車
体外側方に向って開く点火栓着脱空間を左右に形成した
から、点火栓の着脱作業性も良好になる。In addition, by inserting the exhaust expansion pipe between both front wheels,
A pair of left and right spark plug attachment / detachment spaces where the maximum diameter part is located in front of the engine and the diameter is reduced at least behind the spark plug to position the upper edge of the exhaust expansion pipe near the top surface of the cylinder and open to the outside of the vehicle. Can be formed. Therefore, the workability of attaching and detaching the spark plug is improved. Further, since the exhaust expansion pipe is made to enter between the left and right front wheels, it can be made sufficiently long and can be a large-capacity expansion pipe that can maximize engine performance. Furthermore, it is possible to improve the cooling performance of the exhaust expansion pipe by guiding the traveling wind to the exhaust expansion pipe by utilizing the space between the front wheels. Also, since the upper edge of the exhaust expansion pipe is located near the upper surface of the cylinder behind the spark plug and the spark plug attachment / detachment space that opens to the outside of the vehicle body is formed on the left and right, the workability of attaching / detaching the spark plug is also improved. Become.
第1図は本発明の一実施例である不整地走行用4輪車の
側面図、第2図はその要部の平面図、第3図は膨張管を
第1図におけるIII−III線で断面してその配置を示す正
面図である。 60…エンジン、62…シリンダ、68…排気膨張管、74…点
火栓、78…跨座式運転シート、B…点火線着脱空間。FIG. 1 is a side view of a four-wheeled vehicle for traveling on rough terrain, which is an embodiment of the present invention, FIG. 2 is a plan view of a main portion thereof, and FIG. 3 is an expansion tube taken along line III-III in FIG. It is a front view which shows a cross section and its arrangement. 60 ... Engine, 62 ... Cylinder, 68 ... Exhaust expansion pipe, 74 ... Spark plug, 78 ... Straddle-type operation seat, B ... Ignition wire attachment / detachment space.
Claims (1)
体幅方向に並設された2つの気筒にそれぞれ車体両外側
方へ着脱する点火栓を有する2サイクルエンジンと、車
体上部に配設された跨座式運転シートとを備える車輛に
おいて、 前記エンジンの前方から側面視前記両前輪と重なるよう
に両前輪間に進入されエンジンの上側方を通って後方へ
のびる左右一対の排気膨張管を備え、これら両排気膨張
管の最大径部を前記エンジンの前方に位置させ、前記エ
ンジン上部の少なくとも点火栓より後方で前記排気膨張
管の上縁をシリンダ上面付近に位置させて前記排気膨張
管の上方に車体外側方に向って開く左右一対の点火栓着
脱空間を形成したことを特徴とする車輛の排気装置。1. A two-cycle engine having two front wheels, two cylinders mounted in the vicinity of the center of the vehicle body and arranged side by side in the width direction of the vehicle body, each having a spark plug attached to and detached from both sides of the vehicle body, and disposed on the upper portion of the vehicle body. In a vehicle provided with a straddle-type operation seat that has been set, a pair of left and right exhaust expansion pipes that enter from between the front wheels of the engine in a side view and overlap with the front wheels and extend rearward through the upper side of the engine. The exhaust expansion pipe has a maximum diameter portion located in front of the engine, and an upper edge of the exhaust expansion pipe is located near a cylinder upper surface at least behind the spark plug in the upper portion of the engine. An exhaust system for a vehicle, characterized in that a pair of left and right spark plug attachment / detachment spaces that open upward toward the outside of the vehicle body are formed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61020149A JPH0729631B2 (en) | 1986-02-03 | 1986-02-03 | Vehicle exhaust system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61020149A JPH0729631B2 (en) | 1986-02-03 | 1986-02-03 | Vehicle exhaust system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS62178489A JPS62178489A (en) | 1987-08-05 |
JPH0729631B2 true JPH0729631B2 (en) | 1995-04-05 |
Family
ID=12019094
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61020149A Expired - Fee Related JPH0729631B2 (en) | 1986-02-03 | 1986-02-03 | Vehicle exhaust system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0729631B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4546310B2 (en) * | 2005-03-31 | 2010-09-15 | 川崎重工業株式会社 | Exhaust system for motorcycle engine |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58101885A (en) * | 1981-12-09 | 1983-06-17 | ヤマハ発動機株式会社 | Motorcycle loading v-engine |
JPS58176023U (en) * | 1982-05-21 | 1983-11-25 | 本田技研工業株式会社 | Exhaust equipment for motorcycles, etc. |
JPS59104824U (en) * | 1982-12-29 | 1984-07-14 | 本田技研工業株式会社 | Motorcycle silencer support structure |
JPS60128927U (en) * | 1984-02-07 | 1985-08-29 | スズキ株式会社 | Motorcycle muffler wall sound reduction device |
-
1986
- 1986-02-03 JP JP61020149A patent/JPH0729631B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPS62178489A (en) | 1987-08-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |