JPH02128988A - Motorcycle - Google Patents
MotorcycleInfo
- Publication number
- JPH02128988A JPH02128988A JP28308188A JP28308188A JPH02128988A JP H02128988 A JPH02128988 A JP H02128988A JP 28308188 A JP28308188 A JP 28308188A JP 28308188 A JP28308188 A JP 28308188A JP H02128988 A JPH02128988 A JP H02128988A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- drive shaft
- shaft
- axis
- front wheel
- 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
Links
- 230000005484 gravity Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 description 3
- 101000776612 Homo sapiens Cilia- and flagella-associated protein 73 Proteins 0.000 description 1
- 101001012669 Homo sapiens Melanoma inhibitory activity protein 2 Proteins 0.000 description 1
- 102100029778 Melanoma inhibitory activity protein 2 Human genes 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
- F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Automatic Cycles, And Cycles In General (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は自動二輪車に関し、特に低重心化及び前１後輸
の軸間距離（ホイルベース）の短縮を図ることができる
ようにしたエンジン構造の改善に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to motorcycles, and particularly to an engine structure that can lower the center of gravity and shorten the distance between the front and rear axles (wheelbase). Regarding improvement.
ボディを搭載するとともに、該クランクケース内に変速
歯車装置を一体に組み込んだエンジンユニットを搭載す
るのが一般的である。そしてこのようなエンジンユニッ
トを搭載した自動二輪車において、走行安定性、操縦性
を向上させるには、重心を低くすること及び前、後輪の
軸間距離を短縮することが重要である。In addition to mounting a body, it is common to mount an engine unit that has a transmission gear unit integrated into the crankcase. In a motorcycle equipped with such an engine unit, in order to improve running stability and maneuverability, it is important to lower the center of gravity and shorten the distance between the front and rear wheels.
上述の低重心化を図るには、特に４サイクルエンジンの
場合、シリンダボディ、シリンダヘッド部分の重量が大
きいことから、このシリンダボディ等を前傾させること
が有効である（例えば実開昭５９−１７００１８公報参
照）。In order to lower the center of gravity as described above, especially in the case of a 4-stroke engine, since the weight of the cylinder body and cylinder head is large, it is effective to tilt the cylinder body forward (for example, (Refer to Publication No. 170018).
しかしながらシリンダボディ等を極端に前傾させると、
それだけエンジン全長が長くなり、その結果軸間距離が
長（なる問題がある。またシリンダヘッドの前側壁に排
気管を接続するタイプのエンジンの場合、排気管が路面
に近接し過ぎないように小さな曲げＲで屈曲させる必要
があり、排気管の取り回しか困難になるとともに、排気
流の抵抗が大きくなり、かつ十分な排気管長を確保でき
ないという問題もある。However, if the cylinder body etc. is tilted forward extremely,
This increases the overall length of the engine, and as a result, the distance between the shafts becomes long.Also, in the case of an engine that connects the exhaust pipe to the front wall of the cylinder head, the exhaust pipe must be small so that it is not too close to the road surface. It is necessary to bend the exhaust pipe at the bend R, which makes it difficult to route the exhaust pipe, increases the resistance of the exhaust flow, and has the problem that a sufficient length of the exhaust pipe cannot be ensured.
本発明は、上記従来の状況に鑑みてなされたもので、上
記低重心化、軸間距離の短縮、及び排気管取り回しの容
易化の要請にバランスよく応えることのできる自動二輪
車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-mentioned conventional situation, and it is an object of the present invention to provide a motorcycle that can meet the above-mentioned demands for a lower center of gravity, a shortened distance between axles, and easier exhaust pipe routing in a well-balanced manner. The purpose is
そこで本発明に係る自動二輪車は、シリンダ軸線の延長
線が本戦時にヘッドパイプの下端と前輪の上縁との間を
通るようにシリンダボディ、シリンダヘッド及びヘッド
カバーを前傾させてなる４サイクルエンジンユニツトを
車体フレームに搭載し、該エンジンユニットのメイン軸
をクランク軸とドライブ軸と結ぶ線より上方に配置して
、車両右側面から見て上記ドライブ軸、メイン軸、クラ
ンク軸及びシリンダ軸線を結ぶ線が略Ｎ字形を成すよう
に構成したことを特徴としている。Therefore, the motorcycle according to the present invention has a four-stroke engine unit in which the cylinder body, cylinder head, and head cover are tilted forward so that the extension line of the cylinder axis passes between the lower end of the head pipe and the upper edge of the front wheel during the main race. is mounted on the vehicle body frame, and the main shaft of the engine unit is located above the line connecting the crankshaft and the drive shaft, and the line connecting the drive shaft, main shaft, crankshaft, and cylinder axis when viewed from the right side of the vehicle. It is characterized in that it is constructed so as to form a substantially N-shape.
〔作用〕
本発明に係る自動二輪車では、シリンダボディをそのシ
リンダ軸線がヘッドパイプ下端と前輪上縁との間を遣る
ように前傾させたので、ヘッドパイプ下端より上側を向
いた、つまり略直立の従来エンジンに比較して、シリン
ダボディ等の重量物の位置が低くなる分だけ低重心化を
図ることができる。一方、このように前傾させると上記
直立エンジンに比較してエンジン全長が長くなるが、本
発明では、ドライブ軸、メイン軸、クランク軸を、これ
らの軸とシリンダ軸線とが略Ｎ字形をなすように配置し
たので、上記３本の軸を同一直線上に配置した場合に比
較してクランクケース長が短縮され、これにより上記エ
ンジン長の延長分を吸収でき、上記直立エンジンと同程
度の軸間距離に保持できる。[Function] In the motorcycle according to the present invention, the cylinder body is tilted forward so that the cylinder axis extends between the lower end of the head pipe and the upper edge of the front wheel, so that the cylinder body faces upward from the lower end of the head pipe, that is, it is approximately upright. Compared to conventional engines, the center of gravity can be lowered by lowering the position of heavy objects such as the cylinder body. On the other hand, if the engine is tilted forward in this way, the overall length of the engine becomes longer than that of the above-mentioned upright engine, but in the present invention, the drive shaft, main shaft, and crankshaft are arranged so that these shafts and the cylinder axis form a substantially N-shape. As a result, the length of the crankcase is shortened compared to when the three shafts are arranged on the same straight line, and the length of the engine can be absorbed. Can be maintained at a distance.
また、本発明は、前輪上縁より下側を向いた、つまり略
水平の従来エンジンに比較して排気管の取り回しか容易
になるとともに、エンジン全長が短くてすみ、軸間距離
を短縮できる。なお、この略水平の従来エンジンの場合
、本発明よりさらに低重心化を図ることができる訳であ
るが、エンジン全長が太軸に長くなり、この延長分は、
上述のメイン軸等の配置を工夫しても吸収困難である。Further, in the present invention, compared to a conventional engine which is oriented downward from the upper edge of the front wheels, that is, is substantially horizontal, it is easier to route the exhaust pipe, the overall length of the engine can be shortened, and the distance between the shafts can be shortened. In addition, in the case of this approximately horizontal conventional engine, it is possible to lower the center of gravity even further than the present invention, but the overall length of the engine becomes longer due to the thick axis, and this extension is
Even if the arrangement of the above-mentioned main shafts etc. is devised, it is difficult to absorb it.
そのため低重心化、及び軸間距離の短縮の両方を図ると
いう目的を達成できない。Therefore, the objectives of lowering the center of gravity and shortening the distance between the axes cannot be achieved.
以下、本発明の実施例を図について説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
図面は本発明の一実施例による自動二輪車を説明するた
めの図である。The drawings are diagrams for explaining a motorcycle according to an embodiment of the present invention.
図において、ｌは自動二輪車であり、これの車体フレー
ム２は、ヘッドバイブ２ａに一本のタンクレール２ｂを
接続し、該レール２ｂの後端から下方に延びる左、右一
対のシートピラーチューブ２Ｃと上記ヘッドパイプ２ａ
から下方に延びる左。In the figure, l is a motorcycle, and its body frame 2 has a head vibrator 2a connected to one tank rail 2b, and a pair of left and right seat pillar tubes 2C extending downward from the rear end of the rail 2b. and the above head pipe 2a
The left extending downward from.
右一対のダウンチューブ２ｄを車両下方で接続した構成
となっている。The right pair of down tubes 2d are connected below the vehicle.
上記ヘッドパイプ２ａによって、下端で前輪４を軸支す
る前フオーク３が左右に回動自在に支持されている。こ
の前フオーク３は左、右一対のフォーク本体３ａを上、
下のブラケフト３ｃ、３ｃで接続するとともに、咳両ブ
ラケット間に操向軸３ｂを配設してなり、該操向軸３ｂ
が上記ヘンドパイブ２ａで軸支されている。また上記シ
ートピラーチューブ２Ｃに固定されたアームブラケット
２ｅによって、後端で後輪６を軸支するリヤアーム５の
前端が上下揺動自在に枢支されている。A front fork 3, which pivotally supports a front wheel 4 at its lower end, is supported by the head pipe 2a so as to be rotatable left and right. In front of this, the fork 3 has a pair of left and right fork bodies 3a above,
The lower brackets 3c and 3c are connected to each other, and a steering shaft 3b is arranged between both brackets.
is pivotally supported by the hend pipe 2a. Further, the front end of the rear arm 5, which pivotally supports the rear wheel 6 at its rear end, is pivotably supported by an arm bracket 2e fixed to the seat pillar tube 2C so as to be vertically swingable.
また、上記車体フレーム２の中央部には、エンジンユニ
ット８が懸架支持されている。このエンジンユニット８
はクランクケース９にシリンダボディ１０を一体的に設
け、該シリンダボディ１゜上にシリンダへラド１１及び
ヘッドカバー１２を積み上げた構成となっている。なお
、ｌｌａは点火プラグ、１３．１４は気化器、エアクリ
ーナである。Further, an engine unit 8 is suspended and supported at the center of the vehicle body frame 2. This engine unit 8
The cylinder body 10 is integrally provided with the crankcase 9, and the cylinder rad 11 and head cover 12 are stacked 1° above the cylinder body. Note that lla is a spark plug, and 13.14 is a carburetor and an air cleaner.
上記シリンダボディ１０に形成されたシリンダ１０ａ内
に摺動自在に挿入されたピストン１５は、上記クランク
ケース９の前部に車幅方向に配置されたクランク軸１７
のクランクピン１７ａにコンロッド１６を介して接続さ
れている。ここで上記シリンダ１０ａの軸線の延長線Ｂ
は、上記クランり軸１７とヘッドパイプ２ａの下端とを
結ぶ直線Ａ１と、前輪４の上縁とを結ぶ直ＭＩＡ２との
略中央を通っている。A piston 15 slidably inserted into a cylinder 10a formed in the cylinder body 10 is connected to a crankshaft 17 disposed in the front part of the crankcase 9 in the vehicle width direction.
is connected to the crank pin 17a of the engine via a connecting rod 16. Here, an extension line B of the axis of the cylinder 10a
passes through approximately the center of a straight line A1 connecting the crank shaft 17 and the lower end of the head pipe 2a and a straight line MIA2 connecting the upper edge of the front wheel 4.
また、上記クランクケース９の後端付近には、ドライブ
軸１９が上記クランク軸１７と略同じ高さに、かつこれ
と平行に配設されており、さらに該ドライブ軸１９．ク
ランク軸１７間で、かつ両軸より上側にはメイン軸１８
が配置されている。Further, near the rear end of the crankcase 9, a drive shaft 19 is disposed at substantially the same height as and parallel to the crankshaft 17, and the drive shaft 19. The main shaft 18 is located between the crankshafts 17 and above both shafts.
is located.
これにより、上記ドライブ軸１９．メイン軸１８゜クラ
ンク軸１７及びシリンダ軸線を結ぶ線は、車両右側から
見ると略Ｎ字形をなしている。なお、上記メイン軸１８
．ドライブ軸１９は変速歯車装置を構成する軸であり、
クランク軸１７の回転がメイン軸１８に伝達され、これ
が該メイン軸１８゜ドライブ軸１９に装着された複数組
の歯車列の何れかを介して該ドライブ軸１９に伝達され
てドライブスプロケット２０から取り出され、チェ７７
を介して後輪スプロケット６ａに伝達される。As a result, the drive shaft 19. A line connecting the main shaft 18° crankshaft 17 and the cylinder axis forms a substantially N-shape when viewed from the right side of the vehicle. In addition, the main shaft 18
．． The drive shaft 19 is a shaft that constitutes a speed change gear device,
The rotation of the crankshaft 17 is transmitted to the main shaft 18, which is then transmitted to the drive shaft 19 through one of the plurality of sets of gear trains attached to the main shaft 18 and the drive shaft 19, and is taken out from the drive sprocket 20. Re, Che77
The signal is transmitted to the rear wheel sprocket 6a via.
次に本実施例の作用効果について説明する。Next, the effects of this embodiment will be explained.
本実施例では、シリンダ軸線の延長線Ｂがヘンドパイブ
２ａの下端〜前輪４の上縁開領域Ａを通るようにシリン
ダボディ１０．シリンダへラド１１及びヘッドカバー１
２をＲ［頃させたので、シリンダ軸線をヘッドパイプ下
端より起立させた従来の略直立のエンジンに比較して、
重量物の位置が低くなり、それだけ低重心化が図られる
。一方、本実施例エンジンは上記従来の直立エンジンに
比較して前傾角が増えた分だけエンジン全長が延びるこ
ととなるが、本実施例では、ドライブ軸１９゜メイン軸
１８．クランク軸１７をシリンダ軸線とで略Ｎ字形をな
すように配置したので、クランク軸１７とドライブ軸１
９との間隔が狭くなった分だけクランクケース長が短縮
され、上述の前傾による延長分を吸収でき、前、後輪の
軸間距離の延長を抑制できる。In this embodiment, the cylinder body 10 is arranged such that the extension line B of the cylinder axis passes from the lower end of the hend pipe 2a to the upper edge open area A of the front wheel 4. Cylinder head 11 and head cover 1
2 is around R[, compared to a conventional almost upright engine in which the cylinder axis stands up from the lower end of the head pipe.
The position of heavy objects is lowered, which lowers the center of gravity. On the other hand, compared to the conventional upright engine, the overall length of the engine is longer due to the increased forward inclination angle. Since the crankshaft 17 is arranged so as to form a substantially N shape with the cylinder axis, the crankshaft 17 and the drive shaft 1
The length of the crankcase is shortened by the narrower distance from the front wheel 9, and the length of the crank case due to the above-mentioned forward tilt can be absorbed, and the distance between the front and rear wheels can be suppressed from increasing.
また、前輪上縁より下方にさらに前傾させた従来の略水
平のエンジンに比較すれば、軸間距離を大幅に短縮でき
、かつ該従来エンジンに比較して、排気管の曲げＲを大
きくとることができるので、排気管の取り口しか容易と
なり、排気ガスの流動抵抗を軽減できるとともに、十分
な排気管長を確保できる。In addition, compared to a conventional nearly horizontal engine that is tilted forward further downwards from the upper edge of the front wheels, the distance between the axles can be significantly shortened, and the bending radius of the exhaust pipe can be increased compared to the conventional engine. As a result, it is possible to easily install the exhaust pipe, reduce the flow resistance of the exhaust gas, and ensure a sufficient length of the exhaust pipe.
さらにまた、ヘッドカバー１２がヘッドパイプ２ａと前
輪４との間を臨んでいるので、該部分の空間が広（なり
、点火プラグｌｌａの交換等のメンテナンスがやり易い
、また、場合によっては、車両前方からヘッドパイプと
前輪との間を通してＭ長尺のプラグレンチを挿入するこ
とにより、プラグの交換作業を行うこともできる。Furthermore, since the head cover 12 faces between the head pipe 2a and the front wheel 4, the space in this area is wide (this makes maintenance such as replacing the spark plug lla easy to perform, and in some cases, the front of the vehicle The plug can also be replaced by inserting an M-long plug wrench between the head pipe and the front wheel.
なお、上記実施例では、シリンダ軸線の延長線Ｂがヘッ
ドパイプ下端〜前輪上縁間領域Ａの中央を通るようにし
たが、本発明では該領域Ａ内であればどこを通るように
してもよく、上記実施例と略同様の効果が得られる。In the above embodiment, the extension line B of the cylinder axis was arranged to pass through the center of the region A between the lower end of the head pipe and the upper edge of the front wheel, but in the present invention, the extension line B of the cylinder axis can pass anywhere within the region A. Generally, substantially the same effects as in the above embodiment can be obtained.
以上のように本発明に係る自動二輪車によれば、シリン
ダ軸線の延長線がヘッドパイプ下端〜前輪上縁間を通る
ように前傾させるとともに、ドライブ軸、メイン軸、ク
ランク軸を、これらの軸とシリンダ軸線とで略Ｎ字形を
なすように配置したので、低重心化、軸間距離の短縮及
び排気管の取り廻しをバランスよく改善できる効果があ
る。As described above, according to the motorcycle according to the present invention, the extension line of the cylinder axis is tilted forward so as to pass between the lower end of the head pipe and the upper edge of the front wheel, and the drive shaft, main shaft, and crankshaft are Since the cylinder and cylinder axis are arranged to form a substantially N-shape, the center of gravity can be lowered, the distance between the shafts can be shortened, and the exhaust pipe routing can be improved in a well-balanced manner.
図面は本発明の一実施例による自動二輪車の右側面図で
ある。
図において、１は自動二輪車、２は車体フレーム、２ａ
はヘッドバイブ、４は前輪、８はエンジンユニット、１
０はシリンダブロック、１１はシリンダヘッド、１２は
シリンダカバー、１７はクランク軸、１８はメイン軸、
１９はドライブ軸、Ｂはシリンダ軸線の延長線である。
特許出願人 ヤマハ発動機株式会社
代理人 弁理士 下車 努The drawing is a right side view of a motorcycle according to an embodiment of the present invention. In the figure, 1 is a motorcycle, 2 is a body frame, 2a
is the head vibe, 4 is the front wheel, 8 is the engine unit, 1
0 is the cylinder block, 11 is the cylinder head, 12 is the cylinder cover, 17 is the crankshaft, 18 is the main shaft,
19 is a drive shaft, and B is an extension of the cylinder axis. Patent Applicant Yamaha Motor Co., Ltd. Agent Patent Attorney Tsutomu Shimo
Claims (1)
下端と前輪の上縁との間を通るようにシリンダボディを
前傾させてなる４サイクルエンジンユニットを車体フレ
ームに搭載し、該エンジンユニットのメイン軸をクラン
ク軸とドライブ軸と結ぶ線より上方に配置して、車両右
側面から見て上記ドライブ軸、メイン軸、クランク軸及
びシリンダ軸線を結ぶ線が略Ｎ字形を成すように構成し
たことを特徴とする自動二輪車。(1) A four-stroke engine unit is mounted on the vehicle body frame, and the cylinder body is tilted forward so that the extension line of the cylinder axis passes between the lower end of the head pipe and the upper edge of the front wheel when mounted on the vehicle. The main shaft is arranged above the line connecting the crankshaft and the drive shaft, so that the line connecting the drive shaft, main shaft, crankshaft and cylinder axis forms a substantially N-shape when viewed from the right side of the vehicle. A motorcycle featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63283081A JP2870644B2 (en) | 1988-11-09 | 1988-11-09 | Motorcycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63283081A JP2870644B2 (en) | 1988-11-09 | 1988-11-09 | Motorcycle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02128988A true JPH02128988A (en) | 1990-05-17 |
| JP2870644B2 JP2870644B2 (en) | 1999-03-17 |
Family
ID=17660966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63283081A Expired - Fee Related JP2870644B2 (en) | 1988-11-09 | 1988-11-09 | Motorcycle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2870644B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2174710A1 (en) * | 1999-06-24 | 2002-11-01 | Honda Giken Kogyo Kavushiki Ka | Power unit for motorcycle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5471853U (en) * | 1977-10-25 | 1979-05-22 | ||
| JPS60116825A (en) * | 1983-11-29 | 1985-06-24 | Yamaha Motor Co Ltd | Two-cycle engine of motorcycle |
-
1988
- 1988-11-09 JP JP63283081A patent/JP2870644B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5471853U (en) * | 1977-10-25 | 1979-05-22 | ||
| JPS60116825A (en) * | 1983-11-29 | 1985-06-24 | Yamaha Motor Co Ltd | Two-cycle engine of motorcycle |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2174710A1 (en) * | 1999-06-24 | 2002-11-01 | Honda Giken Kogyo Kavushiki Ka | Power unit for motorcycle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2870644B2 (en) | 1999-03-17 |
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