JP2006090255A - Forced air-cooled engine - Google Patents

Forced air-cooled engine Download PDF

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JP2006090255A
JP2006090255A JP2004279188A JP2004279188A JP2006090255A JP 2006090255 A JP2006090255 A JP 2006090255A JP 2004279188 A JP2004279188 A JP 2004279188A JP 2004279188 A JP2004279188 A JP 2004279188A JP 2006090255 A JP2006090255 A JP 2006090255A
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case
forced air
fan
crankcase
cylinders
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JP4332484B2 (en
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Masaharu Ono
雅治 大野
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Kubota Corp
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Kubota Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a forced air-cooled engine for facilitating cleaning work of front faces of cylinder heads. <P>SOLUTION: In this forced air-cooled engine, cylinders 2 and 2 are arranged in an upper part of a crankcase 1; the cylinder heads 3 and 3 are installed in an upper part of these cylinders 2 and 2; a cooling fan 4 is arranged in front of the crankcase 1; this cooling fan 4 is covered with a fan case 5; and when viewed in the parallel direction to the crankshaft axis 6, the respective front faces of the crankcase 1, the cooling fan 4, the cylinders 2 and 2 and the cylinder heads 3 and 3 are overlapped with the fan case 5. The fan case 5 is formed into a divided structure composed of a lower case 7 and an upper case 8. When viewed in the parallel direction to the crankshaft axis 6, the respective front faces of the crankcase 1, the cooling fan 4 and the cylinders 2 and 2 are overlapped with the lower case 7, and the front faces of the cylinder heads 3 and 3 are overlapped with the upper case 8. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、強制空冷エンジンに関し、詳しくは、シリンダヘッドの前面の清掃作業が容易になる強制空冷エンジンに関するものである。   The present invention relates to a forced air cooling engine, and more particularly, to a forced air cooling engine that facilitates cleaning of the front surface of a cylinder head.

従来の強制空冷エンジンとして、本発明と同様、クランクケースの上部にシリンダを設け、このシリンダの上部にシリンダヘッドを組み付け、クランクケースの前方に冷却ファンを配置し、この冷却ファンをファンケースで覆い、クランク軸中心軸線と平行な向きに見て、クランクケースと冷却ファンとシリンダとシリンダヘッドの各前面をファンケースとオーバーラップさせたものがある(例えば、特許文献１参照)。   As a conventional forced air cooling engine, as in the present invention, a cylinder is provided at the top of the crankcase, a cylinder head is assembled at the top of the cylinder, a cooling fan is disposed in front of the crankcase, and the cooling fan is covered with the fan case. In some cases, the front surfaces of the crankcase, the cooling fan, the cylinder, and the cylinder head are overlapped with the fan case when viewed in a direction parallel to the center axis of the crankshaft (see, for example, Patent Document 1).

しかし、上記従来の強制空冷エンジンでは、ファンケースが単一構造であるため、問題が生じている。   However, the conventional forced air cooling engine has a problem because the fan case has a single structure.

特開平５−２６０３８号公報(図１、図２参照)Japanese Patent Laid-Open No. 5-26038 (see FIGS. 1 and 2)

上記従来技術では、次の問題がある。
《問題》 シリンダヘッドの前面の清掃作業が煩雑である。
ファンケースが単一構造であるため、切草等の異物が溜まり易いシリンダヘッドの前面の清掃作業を行う場合でも、ファンケース全体を着脱する必要がある。このため、ファンケース上部の締結具の着脱はもとより、ファンケース下部の締結具の着脱も必要とし、着脱する締結具の数が多いうえ、ファンケース下部の締結具は、エンジンマウント付近の奥まった位置に配置されるため、手が届きにくく、着脱作業が困難である。このため、シリンダヘッドの前面の清掃作業が煩雑である。 The above prior art has the following problems.
<< Problem >> Cleaning of the front surface of the cylinder head is complicated.
Since the fan case has a single structure, it is necessary to attach and detach the entire fan case even when cleaning the front surface of the cylinder head where foreign matter such as cut grass tends to accumulate. For this reason, it is necessary not only to attach and detach the fasteners at the top of the fan case, but also to attach and detach the fasteners at the bottom of the fan case. Since it is arranged at a position, it is difficult to reach and it is difficult to attach and detach. For this reason, the cleaning operation of the front surface of the cylinder head is complicated.

本発明は、上記問題点を解決することができる強制空冷エンジン、すなわち、シリンダヘッド前面の清掃作業が容易になる強制空冷エンジンを提供することを課題とする。   An object of the present invention is to provide a forced air cooling engine that can solve the above-described problems, that is, a forced air cooling engine that facilitates cleaning of the front surface of the cylinder head.

請求項１に係る発明の発明特定事項は、次の通りである。
図１に例示するように、クランクケース(１)の上部にシリンダ(２)(２)を設け、このシリンダ(２)(２)の上部にシリンダヘッド(３)(３)を組み付け、クランクケース(１)の前方に冷却ファン(４)を配置し、この冷却ファン(４)をファンケース(５)で覆い、クランク軸中心軸線(６)と平行な向きに見て、クランクケース(１)と冷却ファン(４)とシリンダ(２)(２)とシリンダヘッド(３)(３)の各前面をファンケース(５)とオーバーラップさせた、強制空冷エンジンにおいて、
ファンケース(５)を下ケース(７)と上ケース(８)からなる分割構造とし、クランク軸中心軸線(６)と平行な向きに見て、クランクケース(１)と冷却ファン(４)とシリンダ(２)(２)の各前面を下ケース(７)とオーバーラップさせ、シリンダヘッド(３)(３)前面を上ケース(８)とオーバーラップさせた、ことを特徴とする強制空冷エンジン。 Invention specific matters of the invention according to claim 1 are as follows.
As shown in FIG. 1, a cylinder (2) (2) is provided at the top of the crankcase (1), and a cylinder head (3) (3) is assembled to the top of the cylinder (2) (2). A cooling fan (4) is arranged in front of (1), this cooling fan (4) is covered with a fan case (5), and viewed in a direction parallel to the crankshaft central axis (6), the crankcase (1) In a forced air cooling engine in which the front surfaces of the cooling fan (4), the cylinder (2) (2) and the cylinder head (3) (3) are overlapped with the fan case (5),
The fan case (5) has a divided structure composed of a lower case (7) and an upper case (8). When viewed in a direction parallel to the crankshaft central axis (6), the crankcase (1) and the cooling fan (4) Forced air-cooled engine characterized in that the front surfaces of the cylinders (2) and (2) overlap with the lower case (7) and the front surfaces of the cylinder heads (3) and (3) overlap with the upper case (8). .

（請求項１に係る発明）
《効果》 シリンダヘッドの前面の清掃作業が容易になる。
図１に例示するように、ファンケース(５)を下ケース(７)と上ケース(８)からなる分割構造とし、クランク軸中心軸線(６)と平行な向きに見て、シリンダヘッド(３)(３)の前面を上ケース(８)とオーバーラップさせたため、切草等の異物が溜まり易いシリンダヘッド(３)(３)の前面の清掃作業を行う場合には、上ケース(８)のみを着脱すればよく、下ケース(７)を着脱する必要はない。このため、着脱する締結具の数が少ないうえ、上ケース(８)の締結具(１１)(１１)(１６)(１６)はエンジンマウントから遠く、手が届き易いため、シリンダヘッド(３)(３)の前面の清掃作業が容易になる。 (Invention according to Claim 1)
<Effect> Cleaning of the front surface of the cylinder head is facilitated.
As illustrated in FIG. 1, the fan case (5) has a divided structure including a lower case (7) and an upper case (8), and is viewed in a direction parallel to the crankshaft central axis (6). ) Since the front of (3) is overlapped with the upper case (8), the upper case (8) is used when cleaning the front of the cylinder head (3) (3) where foreign matter such as cut grass tends to accumulate. It is not necessary to attach or detach the lower case (7). Therefore, the number of fasteners to be attached and detached is small, and the fasteners (11), (11), (16), and (16) of the upper case (8) are far from the engine mount and easily reachable, so that the cylinder head (3) (3) The front surface can be easily cleaned.

（請求項２に係る発明）
請求項１に係る発明の効果に加え、次の効果を奏する。
《効果》 シリンダヘッドの前面の清掃作業が容易になる効果が顕在化する。
図１に例示するように、一対のシリンダ(２)(２)の上部に組み付けた一対のシリンダヘッド(３)前面に吸気ポート入口(９)(９)をあけ、この吸気ポート入口(９)(９)間にインテークマニホルド(１０)を架設したＶ型エンジンに適用した場合には、インテークマニホルド(１０)によって切草等の異物がシリンダヘッド(３)(３)の前面に溜まり易いため、シリンダヘッド(３)の前面の清掃作業が容易になる効果が顕在化する。 (Invention according to Claim 2)
In addition to the effect of the invention according to claim 1, the following effect is achieved.
<Effect> The effect of facilitating the cleaning work of the front surface of the cylinder head becomes obvious.
As illustrated in FIG. 1, an intake port inlet (9) (9) is opened in front of a pair of cylinder heads (3) assembled on top of a pair of cylinders (2) and (2), and the intake port inlet (9) (9) When applied to a V-type engine having an intake manifold (10) installed between them, foreign matter such as cut grass tends to accumulate on the front surface of the cylinder head (3) (3) due to the intake manifold (10). The effect of facilitating cleaning of the front surface of the cylinder head (3) becomes obvious.

（請求項３に係る発明）
請求項２に係る発明の効果に加え、次の効果を奏する。
《効果》 シリンダヘッドとインテークマニホルドとの間の清掃作業も容易になる。
図１に例示するように、クランク軸中心軸線(６)と平行な向きに見て、インテークマニホルド(１０)の前面を上ケース(８)とオーバーラップさせたため、上ケース(７)を外せば、シリンダヘッド(３)(３)とインテークマニホルド(１０)とが前方に露出する。このため、シリンダヘッド(３)(３)とインテークマニホルド(１０)との間の清掃作業も容易になる。 (Invention according to claim 3)
In addition to the effect of the invention according to claim 2, the following effect is achieved.
<Effect> Cleaning between the cylinder head and the intake manifold is also facilitated.
As illustrated in FIG. 1, the front surface of the intake manifold (10) is overlapped with the upper case (8) when viewed in a direction parallel to the crankshaft central axis (6), so that the upper case (7) is removed. The cylinder heads (3) and (3) and the intake manifold (10) are exposed forward. For this reason, the cleaning operation between the cylinder heads (3) and (3) and the intake manifold (10) is also facilitated.

（請求項４に係る発明）
請求項１から請求項３のいずれかに係る発明の効果に加え、次の効果を奏する。
《効果》 燃料噴射用インジェクタの冷却性能が高い。
図１に例示するように、インテークマニホルド(１０)の前部に一対の燃料噴射用インジェクタ(１２)(１２)を配置し、この燃料噴射用インジェクタ(１２)(１２)を上ケース(８)内に収容したため、燃料噴射用インジェクタ(１２)(１２)の冷却性能が高い。 (Invention of Claim 4)
In addition to the effects of the invention according to any one of claims 1 to 3, the following effects are provided.
<Effect> The cooling performance of the fuel injection injector is high.
As illustrated in FIG. 1, a pair of fuel injectors (12) and (12) are arranged in the front portion of the intake manifold (10), and the fuel injectors (12) and (12) are connected to the upper case (8). Since it is housed inside, the fuel injection injectors (12) and (12) have high cooling performance.

《効果》 インジェクタの周囲の清掃も容易になる。
図１に例示するように、インテークマニホルド(１０)の前部に一対の燃料噴射用インジェクタ(１２)(１２)を配置し、この燃料噴射用インジェクタ(１２)(１２)を上ケース(８)内に収容したため、上ケース(８)を取り外せば、燃料噴射用インジェクタ(１２)(１２)が露出するため、燃料噴射用インジェクタ(１２)(１２)の周囲の清掃も容易になる。 <Effect> Cleaning around the injector becomes easy.
As illustrated in FIG. 1, a pair of fuel injectors (12) and (12) are arranged in the front portion of the intake manifold (10), and the fuel injectors (12) and (12) are connected to the upper case (8). When the upper case (8) is removed, the fuel injectors (12) and (12) are exposed, so that the area around the fuel injectors (12) and (12) can be easily cleaned.

（請求項５に係る発明）
請求項１から請求項４のいずれかに係る発明の効果に加え、次の効果を奏する。
《効果》 吸気装置をコンパクトに配置できる。
図１０、図１１に例示するように、インテークマニホルド(１０)の中央部の後方にスロットル弁を設けたスロットル通路(１３)を配置し、このスロットル通路(１３)の後部で、図７に例示するように、一対のシリンダ(２)(２)間に吸気導入管(１４)を配置し、図１に例示するように、この吸気導入管(１４)にエアクリーナ(１５)を接続したため、吸気装置をコンパクトに配置できる。 (Invention according to claim 5)
In addition to the effects of the invention according to any one of claims 1 to 4, the following effects are provided.
<Effect> The intake device can be arranged in a compact manner.
As illustrated in FIGS. 10 and 11, a throttle passage (13) provided with a throttle valve is disposed behind the central portion of the intake manifold (10), and the rear portion of the throttle passage (13) is illustrated in FIG. As shown in FIG. 1, the intake air intake pipe (14) is disposed between the pair of cylinders (2) and (2), and the air cleaner (15) is connected to the intake air intake pipe (14) as illustrated in FIG. The device can be arranged compactly.

本発明の実施の形態を図面に基づいて説明する。図１から図１１は本発明の実施形態に係る強制空冷エンジンを説明する図で、この実施形態では、Ｖ型２気筒のガソリン噴射式の強制空冷エンジンについて説明する。   Embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 11 are views for explaining a forced air-cooled engine according to an embodiment of the present invention. In this embodiment, a V-type 2-cylinder gasoline-injected forced air-cooled engine will be described.

このエンジンの概要は、次の通りである。
図９に示すように、このエンジンは、クランク軸中心軸線(６)と平行な向きに見て、クランクケース(１)から一対のシリンダ(２)(２)を左右斜め上向きに突出させ、一対のシリンダ(２)(２)の上部に一対のシリンダヘッド(３)(３)を組み付け、この一対のシリンダヘッド(３)(３)の上部に一対のヘッドカバー(１７)(１７)を組み付けている。図１０に示すように、クランクケース(１)内にはクランク軸(２７)と動弁カム軸(２８)とを架設している。図１に示すように、クランクケース(１)の横一側にはスタータモータ(２９)を、横他側にはオイルフィルタ(３０)を配置している。 The outline of this engine is as follows.
As shown in FIG. 9, this engine has a pair of cylinders (2) and (2) protruding obliquely upward and leftward from the crankcase (1) when viewed in a direction parallel to the crankshaft central axis (6). A pair of cylinder heads (3) and (3) are assembled to the upper parts of the cylinders (2) and (2), and a pair of head covers (17) and (17) are assembled to the upper parts of the pair of cylinder heads (3) and (3). Yes. As shown in FIG. 10, a crankshaft (27) and a valve camshaft (28) are installed in the crankcase (1). As shown in FIG. 1, a starter motor (29) is arranged on one side of the crankcase (1), and an oil filter (30) is arranged on the other side.

このエンジンの空冷装置の概要は、次の通りである。
図１０に示すように、クランクケース(１)の前方に冷却ファン(４)を配置し、この冷却ファン(４)をファンケース(５)で覆い、図１に示すように、クランク軸中心軸線(６)と平行な向きに見て、クランクケース(１)と冷却ファン(４)とシリンダ(２)(２)とシリンダヘッド(３)(３)の各前面をファンケース(５)とオーバーラップさせている。冷却ファン(４)は、図１中の矢印の向きに回転する。 The outline of the air cooling device of this engine is as follows.
As shown in FIG. 10, a cooling fan (4) is disposed in front of the crankcase (1), and this cooling fan (4) is covered with the fan case (5). As shown in FIG. When viewed parallel to (6), the front of each of the crankcase (1), cooling fan (4), cylinder (2) (2), and cylinder head (3) (3) is over the fan case (5). Wrapping. The cooling fan (4) rotates in the direction of the arrow in FIG.

ファンケースの構造は、次の通りである。
図１〜図５に示すように、ファンケース(５)を下ケース(７)と上ケース(８)からなる分割構造とし、図１に示すように、クランク軸中心軸線(６)と平行な向きに見て、クランクケース(１)と冷却ファン(４)とシリンダ(２)(２)の各前面を下ケース(７)とオーバーラップさせ、シリンダヘッド(３)(３)の前面とインテークマニホルド(１０)の前面を上ケース(８)とオーバーラップさせている。図１中の太い破線がした下ケース(７)の上縁を示しており、上ケース(８)を取り外すと、下ケース(７)の上縁より上の部分が露出する。 The structure of the fan case is as follows.
As shown in FIGS. 1 to 5, the fan case (5) is divided into a lower case (7) and an upper case (8), and is parallel to the crankshaft center axis (6) as shown in FIG. Looking in the direction, the front of the crankcase (1), cooling fan (4) and cylinder (2) (2) overlap the lower case (7), and the front of the cylinder head (3) (3) and intake The front surface of the manifold (10) is overlapped with the upper case (8). The upper edge of the lower case (7) indicated by a thick broken line in FIG. 1 is shown. When the upper case (8) is removed, a portion above the upper edge of the lower case (7) is exposed.

下ケースの構造は、次の通りである。
図２に示すように、下ケース(７)は、前面に防塵構造の冷却風入口(１８)を備え、冷却ファン(４)を収容している。冷却ファン(４)は遠心ファンで、図４(Ａ)に示すように、下ケース(７)の内部には上と横に一対の締め切り部(１９)(１９)を設け、下ケース(７)の上部には左右一対の冷却風出口(２０)(２０)を設けている。この冷却風出口(２０)(２０)から上カバー(８)で覆われた一対のシリンダヘッド(３)(３)に冷却風を供給する。図１に示すように、クランクケース(１)には左右に一対のブラケット(２３)(２３)を取り付け、この一対のブラケット(２３)(２３)に、上左右一対の締結具(２１)(２１)と下左右一対の締結具(２２)(２２)とで、下ケース(７)を取り付けている。図４に示すように、下ケース(７)の締結具取付部は、下ケース(７)の横壁に設けた後開口の切り欠き(２４)で、下ケース(７)の着脱は、上左右一対の締結具(２１)(２１)と下左右一対の締結具(２２)(２２)を緩め、下ケース(７)を前後方向にスライドさせて行う。 The structure of the lower case is as follows.
As shown in FIG. 2, the lower case (7) has a dust-proof cooling air inlet (18) on the front surface and accommodates a cooling fan (4). The cooling fan (4) is a centrifugal fan, and as shown in FIG. 4 (A), a pair of cut-off portions (19) and (19) are provided inside the lower case (7) on the upper side and the side, and the lower case (7 ) Is provided with a pair of left and right cooling air outlets (20) and (20). Cooling air is supplied from the cooling air outlets 20, 20 to the pair of cylinder heads 3, 3 covered with the upper cover 8. As shown in FIG. 1, a pair of brackets (23) and (23) are attached to the left and right sides of the crankcase (1), and a pair of upper and left and right fasteners (21) ( 21) and a pair of lower left and right fasteners (22) and (22) attach the lower case (7). As shown in FIG. 4, the fastener mounting portion of the lower case (7) is a notch (24) in the rear opening provided on the lateral wall of the lower case (7). The pair of fasteners (21) and (21) and the pair of lower left and right fasteners (22) and (22) are loosened, and the lower case (7) is slid back and forth.

上ケースの構造は、次の通りである。
図１に示すように、上ケース(８)は、一対のシリンダヘッド(３)(３)の前面を覆い、前左右一対の締結具(１１)(１１)でインテークマニホルド(１０)に取り付けるとともに、横左右一対の締結具(１６)(１６)で下カバー(８)に取り付けている。図５に示すように、上ケース(８)の締結具取付部は、前左右一対のものが上ケース(８)の前壁に設けた丸孔(２５)(２５)で、横左右一対のものが上ケース(８)の横壁に設けた後開口の切り欠き(２６)(２６)で、上ケース(８)の着脱は、前一対の締結具(１１)(１１)を取り外しておき、横左右一対の締結具(１６)(１６)を緩め、上ケース(８)を前後にスライドさせて行う。 The structure of the upper case is as follows.
As shown in FIG. 1, the upper case (8) covers the front surfaces of the pair of cylinder heads (3) and (3) and is attached to the intake manifold (10) with a pair of front and right fasteners (11) and (11). The left and right pair of fasteners (16) and (16) are attached to the lower cover (8). As shown in FIG. 5, the fastener mounting portion of the upper case (8) has a pair of front left and right round holes (25) and (25) provided in the front wall of the upper case (8). A thing is a notch (26) (26) of the rear opening provided on the lateral wall of the upper case (8), and the upper case (8) is attached and detached by removing the front pair of fasteners (11) (11), Loosen the pair of lateral and left and right fasteners (16) and (16) and slide the upper case (8) back and forth.

吸気装置の構成は、次の通りである。
図１に示すように、一対のシリンダ(２)(２)の上部に組み付けた一対のシリンダヘッド(３)の前面に吸気ポート入口(９)(９)をあけ、この吸気ポート入口(９)(９)間にインテークマニホルド(１０)を架設している。図１０に示すように、インテークマニホルド(１０)の中央部の後方にスロットル弁を設けたスロットル通路(１３)を配置し、このスロットル通路(１３)の後部で、一対のシリンダ(２)(２)間に吸気導入管(１４)を配置し、この吸気導入管(１４)にエアクリーナ(１５)を接続している。 The configuration of the intake device is as follows.
As shown in FIG. 1, an intake port inlet (9) (9) is opened in front of a pair of cylinder heads (3) assembled on top of a pair of cylinders (2) and (2). (9) An intake manifold (10) is installed between them. As shown in FIG. 10, a throttle passage (13) provided with a throttle valve is arranged behind the central portion of the intake manifold (10), and a pair of cylinders (2), (2) is provided at the rear of the throttle passage (13). ) Between the air intake pipe (14), and an air cleaner (15) is connected to the air intake pipe (14).

燃料供給装置の構成は、次の通りである。
インテークマニホルド(１０)の前部に一対の燃料噴射用インジェクタ(１２)(１２)を配置し、この燃料噴射用インジェクタ(１２)(１２)を上ケース(８)内に収容している。燃料噴射用インジェクタ(１２)(１２)は、弁アクチュエータを備えている。燃料噴射用インジェクタ(１２)(１２)には、燃料タンクの燃料を燃料圧送ポンプで供給し、弁アクチュエータで弁を開閉して、所定タイミングで所定量の燃料噴射を行う。 The configuration of the fuel supply device is as follows.
A pair of fuel injectors (12), (12) is disposed in the front portion of the intake manifold (10), and the fuel injectors (12), (12) are accommodated in the upper case (8). The fuel injection injectors (12) and (12) include a valve actuator. The fuel injection injectors (12) and (12) are supplied with fuel in the fuel tank by a fuel pump, and are opened and closed by a valve actuator to inject a predetermined amount of fuel at a predetermined timing.

図１１は上記実施形態の変更例を示している。この変更例では、燃料供給を燃料噴射用インジェクタ(１２)(１２)で行うことに代えて、キャブレータ(３１)で行う。このため、スロットル通路(１３)はキャブレータ(３１)内に形成される。他の構成は、図１０のものと同一である。図１１中、図１０と同一の要素には、同一の符号を付しておく。   FIG. 11 shows a modification of the above embodiment. In this modified example, fuel is supplied by the carburetor (31) instead of the fuel injection injectors (12) and (12). For this reason, the throttle passage (13) is formed in the carburetor (31). The other configuration is the same as that of FIG. In FIG. 11, the same elements as those in FIG.

本発明の実施形態に係る強制空冷エンジンの各部品を重ねた正面図である。It is the front view which piled up each component of the forced air cooling engine which concerns on embodiment of this invention. 図１のエンジンの正面図である。It is a front view of the engine of FIG. 図１のエンジンに用いるファンケースをインテークマニホルドに取り付けた状態の背面図である。It is a rear view of the state which attached the fan case used for the engine of FIG. 1 to the intake manifold. 図１のエンジンに用いる下ケースを説明する図で、図４(Ａ)は背面図、図４(Ｂ)は平面図、図４(Ｃ)は側面図、図４(Ｄ)は底面図である。FIG. 4A is a rear view, FIG. 4B is a plan view, FIG. 4C is a side view, and FIG. 4D is a bottom view. is there. 図１のエンジンに用いる上ケースを説明する図で、図５(Ａ)は背面図、図５(Ｂ)は平面図、図５(Ｃ)は側面図である。FIG. 5A is a rear view, FIG. 5B is a plan view, and FIG. 5C is a side view, illustrating an upper case used in the engine of FIG. 1. 図１のエンジンのシリンダヘッドと吸気装置を省略した側面図である。FIG. 2 is a side view in which a cylinder head and an intake device of the engine of FIG. 1 are omitted. 図１のエンジンのエアクリーナを省略した平面図である。It is the top view which abbreviate | omitted the air cleaner of the engine of FIG. 図１のエンジンの背面図である。It is a rear view of the engine of FIG. 図１のエンジンの縦断背面図である。It is a vertical rear view of the engine of FIG. 図１のエンジンの縦断側面図である。It is a vertical side view of the engine of FIG. 図１のエンジンの変更例の縦断側面図である。It is a vertical side view of the example of a change of the engine of FIG.

符号の説明Explanation of symbols

(１)…クランクケース、(２)…シリンダ、(３)…シリンダヘッド、(４)…冷却ファン、(５)…ファンケース、(６)…クランク軸中心軸線、(７)…下ケース、(８)…上ケース、(９)…吸気ポート入口、(１０)…インテークマニホルド、(１１)…締結具、(１２)…燃料噴射用インジェクタ、(１３)…スロットル通路、(１４)…吸気導入管、(１５)…エアクリーナ。

(1) ... Crank case, (2) ... Cylinder, (3) ... Cylinder head, (4) ... Cooling fan, (5) ... Fan case, (6) ... Crankshaft center axis, (7) ... Lower case, (8) ... Upper case, (9) ... Intake port inlet, (10) ... Intake manifold, (11) ... Fastener, (12) ... Injector for fuel injection, (13) ... Throttle passage, (14) ... Intake Introducing tube, (15) Air cleaner.

Claims (5)

クランクケース(１)の上部にシリンダ(２)(２)を設け、このシリンダ(２)(２)の上部にシリンダヘッド(３)(３)を組み付け、クランクケース(１)の前方に冷却ファン(４)を配置し、この冷却ファン(４)をファンケース(５)で覆い、クランク軸中心軸線(６)と平行な向きに見て、クランクケース(１)と冷却ファン(４)とシリンダ(２)(２)とシリンダヘッド(３)(３)の各前面をファンケース(５)とオーバーラップさせた、強制空冷エンジンにおいて、
ファンケース(５)を下ケース(７)と上ケース(８)からなる分割構造とし、クランク軸中心軸線(６)と平行な向きに見て、クランクケース(１)と冷却ファン(４)とシリンダ(２)(２)の各前面を下ケース(７)とオーバーラップさせ、シリンダヘッド(３)(３)の前面を上ケース(８)とオーバーラップさせた、ことを特徴とする強制空冷エンジン。 Cylinders (2) and (2) are provided at the top of the crankcase (1), the cylinder heads (3) and (3) are assembled to the top of the cylinders (2) and (2), and a cooling fan is placed in front of the crankcase (1). (4) is placed, this cooling fan (4) is covered with a fan case (5), and viewed in a direction parallel to the crankshaft central axis (6), the crankcase (1), the cooling fan (4) and the cylinder (2) In a forced air cooling engine in which the front faces of (2) and cylinder heads (3) and (3) overlap with a fan case (5),
The fan case (5) has a divided structure composed of a lower case (7) and an upper case (8). When viewed in a direction parallel to the crankshaft central axis (6), the crankcase (1) and the cooling fan (4) Forced air cooling, characterized in that the front surfaces of the cylinders (2) and (2) overlap the lower case (7) and the front surfaces of the cylinder heads (3) and (3) overlap the upper case (8). engine. 請求項１に記載した強制空冷エンジンにおいて、
クランク軸中心軸線(６)と平行な向きに見て、クランクケース(１)から一対のシリンダ(２)(２)を左右斜め上向きに突出させ、一対のシリンダ(２)(２)の上部に組み付けた一対のシリンダヘッド(３)の前面に吸気ポート入口(９)(９)をあけ、この吸気ポート入口(９)(９)間にインテークマニホルド(１０)を架設したＶ型エンジンに適用した、ことを特徴とする強制空冷エンジン。 The forced air cooling engine according to claim 1,
The pair of cylinders (2) and (2) are projected obliquely upward and leftward from the crankcase (1) when viewed in a direction parallel to the crankshaft central axis (6), and above the pair of cylinders (2) and (2). This was applied to a V-type engine in which intake port inlets (9) and (9) were opened in front of a pair of assembled cylinder heads (3), and an intake manifold (10) was installed between the intake port inlets (9) and (9). , A forced air-cooled engine characterized by that. 請求項２に記載した強制空冷エンジンにおいて、
上ケース(８)の前面に配置した締結具(１１)(１１)で、上ケース(８)をインテークマニホルド(１０)に取り付け、クランク軸中心軸線(６)と平行な向きに見て、インテークマニホルド(１０)の前面を上ケース(８)とオーバーラップさせた、ことを特徴とする強制空冷エンジン。 The forced air cooling engine according to claim 2,
Attach the upper case (8) to the intake manifold (10) with the fasteners (11) and (11) arranged on the front surface of the upper case (8), and look at the direction parallel to the center axis (6) of the crankshaft. A forced air cooling engine characterized in that the front surface of the manifold (10) overlaps the upper case (8). 請求項２または請求項３に記載した強制空冷エンジンにおいて、インテークマニホルド(１０)の前部に一対の燃料噴射用インジェクタ(１２)(１２)を配置し、この燃料噴射用インジェクタ(１２)(１２)を上ケース(８)内に収容した、ことを特徴とする強制空冷エンジン。 In the forced air-cooled engine according to claim 2 or 3, a pair of fuel injection injectors (12) (12) are arranged in front of the intake manifold (10), and the fuel injection injectors (12) (12) ) Is housed in the upper case (8). 請求項２から請求項４のいずれかに記載した強制空冷エンジンにおいて、
インテークマニホルド(１０)の中央部の後方にスロットル弁を設けたスロットル通路(１３)を配置し、このスロットル通路(１３)の後部で、一対のシリンダ(２)(２)間に吸気導入管(１４)を配置し、この吸気導入管(１４)にエアクリーナ(１５)を接続した、ことを特徴とする強制空冷エンジン。

In the forced air cooling engine according to any one of claims 2 to 4,
A throttle passage (13) provided with a throttle valve is disposed behind the center of the intake manifold (10), and an intake air intake pipe (between a pair of cylinders (2) and (2) is disposed at the rear of the throttle passage (13). 14), and an air cleaner (15) is connected to the intake pipe (14).

JP2004279188A 2004-09-27 2004-09-27 Forced air cooling engine Expired - Fee Related JP4332484B2 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008045489A (en) * 2006-08-16 2008-02-28 Honda Motor Co Ltd General purpose internal combustion engine
JP2008138614A (en) * 2006-12-04 2008-06-19 Kubota Corp Air-cooled v-type engine
JP2008138613A (en) * 2006-12-04 2008-06-19 Kubota Corp Air-cooled v-type engine
US7523726B2 (en) 2006-12-04 2009-04-28 Kubota Corporation Air-cooled V-shaped engine
TWI405899B (en) * 2011-05-23 2013-08-21 Sanyang Industry Co Ltd Cleaning device for stepless speed change system
US10107239B2 (en) 2015-12-21 2018-10-23 Kubota Corporation Air-cooled V-type engine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008045489A (en) * 2006-08-16 2008-02-28 Honda Motor Co Ltd General purpose internal combustion engine
JP2008138614A (en) * 2006-12-04 2008-06-19 Kubota Corp Air-cooled v-type engine
JP2008138613A (en) * 2006-12-04 2008-06-19 Kubota Corp Air-cooled v-type engine
US7523726B2 (en) 2006-12-04 2009-04-28 Kubota Corporation Air-cooled V-shaped engine
JP4682123B2 (en) * 2006-12-04 2011-05-11 株式会社クボタ Air-cooled V-type engine
JP4682124B2 (en) * 2006-12-04 2011-05-11 株式会社クボタ Air-cooled V-type engine
TWI405899B (en) * 2011-05-23 2013-08-21 Sanyang Industry Co Ltd Cleaning device for stepless speed change system
US10107239B2 (en) 2015-12-21 2018-10-23 Kubota Corporation Air-cooled V-type engine

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