JP4649372B2 - Air-cooled tilt engine - Google Patents
Air-cooled tilt engine Download PDFInfo
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- JP4649372B2 JP4649372B2 JP2006155925A JP2006155925A JP4649372B2 JP 4649372 B2 JP4649372 B2 JP 4649372B2 JP 2006155925 A JP2006155925 A JP 2006155925A JP 2006155925 A JP2006155925 A JP 2006155925A JP 4649372 B2 JP4649372 B2 JP 4649372B2
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Description
本発明は、空冷傾斜エンジンに関し、詳しくは、燃料タンクが加熱されるのを防止することができる傾斜エンジンに関するものである。 The present invention relates to an air-cooled tilt engine, and more particularly to a tilt engine that can prevent a fuel tank from being heated.
従来の空冷傾斜エンジンとして、本発明と同様、クランク軸中心軸線と平行な向きに見て、クランクケースからシリンダを斜め上向きに突出させ、このシリンダの突出端にシリンダヘッドを組み付け、クランクケースの上方に燃料タンクを配置し、燃料タンクの横でシリンダヘッドの上方に排気マフラのマフラ本体を配置し、
クランク軸中心軸線の架設方向を前後方向、その一方を前として、クランクケースの前部にファンケースを取付け、このファンケースからシリンダ周壁とシリンダヘッド周壁とに沿ってエンジン冷却風通路を設け、このエンジン冷却風通路の終端でエンジン後部にエンジン冷却排風出口を設け、シリンダヘッドの後面に排気マフラの排気導入管を取り付け、排気導入管の後部に管カバーを取り付け、管カバー後壁をシリンダ冷却排風出口にその後方から臨ませ、マフラ本体に下面を開口させたマフラカバーを被せ、エンジン冷却排風出口から排出されたエンジン冷却排風を管カバーでマフラカバー内に案内するようにしたものがある(例えば、特許文献１参照)。
この種のエンジンでは、マフラカバー内に導入されたエンジン冷却排風でマフラ本体を冷却し、排気マフラから放出される排気の膨張率を低下させることにより排気騒音を低減することができる。
As a conventional air-cooled tilt engine, as in the present invention, the cylinder is protruded obliquely upward from the crankcase when viewed in a direction parallel to the center axis of the crankshaft, and a cylinder head is assembled to the protruding end of the cylinder. A fuel tank, and a muffler body of an exhaust muffler on the side of the fuel tank and above the cylinder head.
A fan case is attached to the front of the crankcase with the erection direction of the center axis of the crankshaft as the front and rear direction, and one of them is the front, and an engine cooling air passage is provided from the fan case along the cylinder peripheral wall and cylinder head peripheral wall. An engine cooling exhaust outlet is provided at the rear of the engine at the end of the engine cooling air passage, an exhaust muffler exhaust pipe is attached to the rear of the cylinder head, a pipe cover is attached to the rear of the exhaust pipe, and the rear wall of the pipe cover is cooled by the cylinder. A muffler cover that faces the exhaust air outlet from behind and covers the lower surface of the muffler body, and the engine cooling exhaust air discharged from the engine cooling exhaust air outlet is guided into the muffler cover by the tube cover. (For example, refer to Patent Document 1).
In this type of engine, exhaust noise can be reduced by cooling the muffler body with engine cooling exhaust air introduced into the muffler cover and reducing the expansion rate of the exhaust discharged from the exhaust muffler.
しかし、上記従来の空冷傾斜エンジンでは、マフラ冷却排風がマフラカバーの下開口のみからマフラカバー外に排出される構造になっているため、問題が生じている。 However, the conventional air-cooled inclined engine has a problem in that the exhaust air from the muffler is exhausted only from the lower opening of the muffler cover to the outside of the muffler cover.
上記従来技術では、次の問題がある。
《問題》 燃料タンクが加熱される。
マフラ冷却排風がマフラカバーの下開口のみからマフラカバー外に排出される構造になっているため、高温のマフラ冷却排風の多くがマフラカバーの下開口から燃料用タンク側に排出され、燃料タンクの壁に接し、燃料タンクが加熱される。このため、蒸発した燃料で燃料供給経路にベーバーロックが生じ、燃料供給不足により、エンストが起こりやすい。
The above prior art has the following problems.
<Problem> The fuel tank is heated.
Since the muffler cooling exhaust air is exhausted only from the lower opening of the muffler cover to the outside of the muffler cover, most of the hot muffler cooling exhaust air is discharged from the lower opening of the muffler cover to the fuel tank side, and the fuel The fuel tank is heated in contact with the tank wall. For this reason, vaporized fuel causes a Baber lock in the fuel supply path, and engine stall is likely to occur due to insufficient fuel supply.
本発明は、上記問題点を解決することができる傾斜エンジン、すなわち、燃料タンクが加熱されるのを防止することができる傾斜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 tilt engine that can solve the above-described problems, that is, a tilt engine that can prevent the fuel tank from being heated.
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、クランク軸中心軸線(１)と平行な向きに見て、クランクケース(２)からシリンダ(３)を斜め上向きに突出させ、このシリンダ(３)の突出端にシリンダヘッド(４)を組み付け、クランクケース(２)の上方に燃料タンク(５)を配置し、燃料タンク(５)の横でシリンダヘッド(４)の上方に排気マフラ(６)のマフラ本体(７)を配置し、
図３に例示するように、クランク軸中心軸線(１)の架設方向を前後方向、その一方を前として、クランクケース(２)の前部にファンケース(８)を取り付け、図１に例示するように、このファンケース(８)からシリンダ周壁とシリンダヘッド周壁とに沿ってエンジン冷却風通路(９)を設け、このエンジン冷却風通路(９)の終端でエンジン後部にエンジン冷却排風出口(１０)を設け、シリンダヘッド(４)の後面にマフラ本体(７)の排気導入管(１１)を取り付け、この排気導入管(１１)の後部に管カバー(１２)を取り付け、管カバー後壁(１２ａ)をエンジン冷却排風出口(１０)にその後方から臨ませ、マフラ本体(７)に下面を開口させたマフラカバー(１４)を被せ、エンジン冷却排風出口(１０)から排出されたエンジン冷却排風(１５)を管カバー(１２)でマフラカバー(１４)内に案内するようにした、空冷傾斜エンジンにおいて、
図１に例示するように、マフラカバー(１４)の燃料タンク寄り側壁(１６)とマフラ本体(７)との間に横通風隙間(１７)を設け、エンジン冷却排風出口(１０)から排出されたエンジン冷却排風(１５)を管カバー(１２)で横通風隙間(１７)の後端入口部(１８)に案内するようにし、図２または図７に例示するように、マフラカバー(１４)の前端に横通風隙間(１７)の前端出口部(１９)と連通するマフラ冷却排風出口(２０)をあけ、
図１及び図５に例示するように、管カバー後壁(１２ａ)をマフラカバー後壁(１４ａ)よりも燃料タンク(５)側の横方向に大きく張り出し、この管カバー後壁(１２ａ)の横張り出し部(２２)の横縁部から前向きに横壁(２３)を導出し、管カバー後壁(１２ａ)の横張り出し部(２２)の上縁部から前向きに天井壁(２４)を導出し、この天井壁(２４)の前端縁から下向きに前壁(２５)を導出し、管カバー後壁(１２ａ)の横張り出し部(２２)の上部前方に、管カバー後壁(１２ａ)の横張り出し部(２２)と天井壁(２４)と前壁(２５)と横壁(２３)で囲まれたエンジン冷却排風(１５)の捕捉空間(２６)を形成し、この捕捉空間(２６)に上記横壁(２３)と対向する横出口(２７)を設け、この横出口(２７)の横に管カバー後壁(１２ａ)の前方に位置する中継空間(２８)を設け、上記横出口(２７)にその横からこの中継空間(２８)を臨ませ、この中継空間(２８)にその上方から前記横通風隙間(１７)の後端入口部(１８)を臨ませた、ことを特徴とする空冷傾斜エンジン。
Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 1, the cylinder (3) is projected obliquely upward from the crankcase (2) when viewed in a direction parallel to the center axis (1) of the crankshaft. The head (4) is assembled, the fuel tank (5) is arranged above the crankcase (2), and the muffler body (7) of the exhaust muffler (6) is placed beside the fuel tank (5) and above the cylinder head (4). )
As illustrated in FIG. 3, a fan case (8) is attached to the front portion of the crankcase (2) with the installation direction of the crankshaft central axis (1) as the front-rear direction and one of the front as the front, and is illustrated in FIG. As described above, an engine cooling air passage (9) is provided from the fan case (8) along the cylinder peripheral wall and the cylinder head peripheral wall, and at the end of the engine cooling air passage (9), an engine cooling exhaust air outlet ( 10), an exhaust introduction pipe (11) of the muffler body (7) is attached to the rear surface of the cylinder head (4), a pipe cover (12) is attached to the rear part of the exhaust introduction pipe (11), and the rear wall of the pipe cover (12a) was exposed to the engine cooling exhaust air outlet (10) from behind, and the muffler body (7) was covered with a muffler cover (14) whose lower surface was opened, and was discharged from the engine cooling exhaust air outlet (10). The engine cooling exhaust air (15) is muffled by the pipe cover (12). And to guide the bar (14), the air-cooled inclined engine,
As illustrated in FIG. 1, a lateral ventilation gap (17) is provided between the side wall (16) near the fuel tank of the muffler cover (14) and the muffler body (7), and exhausted from the engine cooling exhaust air outlet (10). The engine cooling exhaust air (15) is guided by the pipe cover (12) to the rear end inlet (18) of the side ventilation gap (17), and as illustrated in FIG. 2 or FIG. 14) A muffler cooling exhaust outlet (20) communicating with the front end outlet (19) of the side ventilation gap (17) is opened at the front end of 14)
As illustrated in FIGS. 1 and 5, the tube cover rear wall (12a) is extended to the lateral side of the fuel tank (5) side more than the muffler cover rear wall (14a), and the tube cover rear wall (12a) The lateral wall (23) is led forward from the lateral edge of the lateral projection (22), and the ceiling wall (24) is derived forward from the upper edge of the lateral projection (22) of the tube cover rear wall (12a). The front wall (25) is led out downward from the front end edge of the ceiling wall (24), and the side of the tube cover rear wall (12a) is placed in front of the upper portion of the laterally projecting portion (22) of the tube cover rear wall (12a). A capture space (26) for the engine cooling exhaust air (15) surrounded by the overhanging portion (22), the ceiling wall (24), the front wall (25), and the lateral wall (23) is formed, and the capture space (26) A lateral outlet (27) facing the lateral wall (23) is provided, a relay space (28) located in front of the pipe cover rear wall (12a) is provided beside the lateral outlet (27), and The relay space (28) was faced from the side to the side exit (27), and the rear end entrance (18) of the side ventilation gap (17) was faced to the relay space (28) from above. An air-cooled tilt engine characterized by
（請求項１に係る発明）
《効果》 燃料タンクが加熱されるのを防止することができる。
図１に例示するように、マフラカバー(１４)の燃料タンク寄り側壁(１６)とマフラ本体(７)との間に横通風隙間(１７)を設け、エンジン冷却排風出口(１０)から排出されたエンジン冷却排風(１５)を管カバー(１２)で横通風隙間(１７)の後端入口部(１８)に案内するようにし、図２に例示するように、マフラカバー(１４)の前端に横通風隙間(１７)の前端出口部(１９)と連通するマフラ冷却排風出口(２０)をあけたので、エンジン冷却排風(１５)は、マフラカバー(１４)内で横通風隙間(１７)を前方に向けて通過し、マフラ冷却排風(２９)となって、前方のマフラ冷却排風出口(２０)からマフラカバー(１４)外に放出される。このため、マフラ冷却排風(２９)がマフラカバー(１４)の下開口から燃料タンク(５)側に排出されにくく、高温のマフラ冷却排風で燃料タンク(５)が加熱されるのを防止することができる。また、エンジン冷却排風(１５)が通風隙間(１７)を通過するため、横通風隙間(１７)に熱が停滞せず、横通風隙間(１７)が遮熱空間となって、マフラ本体(７)から燃料タンク(５)への熱の伝達を防止することができる。これらの理由により、燃料タンク(５)が加熱されるのを防止することができる。
《効果》 マフラ本体の冷却効率が高まる。
図１及び図５に例示するように、管カバー後壁(１２ａ)の横張り出し部(２２)の上部前方に、管カバー後壁(１２ａ)の横張り出し部(２２)と天井壁(２４)と前壁(２５)と横壁(２３)で囲まれたエンジン冷却排風(１５)の捕捉空間(２６)を形成し、この捕捉空間(２６)に上記横壁(２３)と対向する横出口(２７)を設け、この横出口(２７)の横に管カバー後壁(１２ａ)の前方に位置する中継空間(２８)を設け、上記横出口(２７)にその横からこの中継空間(２８)を臨ませ、この中継空間(２８)にその上方から前記横通風隙間(１７)の後端入口部(１８)を臨ませたので、管カバー後壁(１２ａ)の横張り出し部(２２)に沿って横に拡散したエンジン冷却排風(１５)は、管カバー後壁(１２ａ)の横張り出し部(２２)に沿って浮上し、捕捉空間(２６)から横出口(２７)と中継空間(２８)とを経て横通風隙間(１７)の後端入口部(１８)に浮上する。このため、多くのエンジン冷却排風(１５)が捕捉空間(２６)に集められ、横通風隙間(１７)に流入し、マフラ本体(７)の冷却効率が高まる。
(Invention according to Claim 1)
<Effect> It is possible to prevent the fuel tank from being heated.
As illustrated in FIG. 1, a lateral ventilation gap (17) is provided between the side wall (16) near the fuel tank of the muffler cover (14) and the muffler body (7), and exhausted from the engine cooling exhaust air outlet (10). The engine cooling exhaust air (15) is guided to the rear end inlet (18) of the side ventilation gap (17) by the pipe cover (12), and as illustrated in FIG. 2, the muffler cover (14) Since the muffler cooling exhaust outlet (20) communicating with the front end outlet portion (19) of the side ventilation gap (17) is opened at the front end, the engine cooling exhaust air (15) is passed through the muffler cover (14). It passes through (17) forward, becomes muffler cooling exhaust air (29), and is discharged out of the muffler cover (14) from the front muffler cooling exhaust air outlet (20). Therefore, the muffler cooling exhaust air (29) is not easily discharged from the lower opening of the muffler cover (14) to the fuel tank (5) side, and the fuel tank (5) is prevented from being heated by the high temperature muffler cooling exhaust air. can do. Further, since the engine cooling exhaust air (15) passes through the ventilation gap (17), heat does not stagnate in the side ventilation gap (17), and the side ventilation gap (17) becomes a heat shield space, and the muffler body ( Heat transfer from 7) to the fuel tank (5) can be prevented. For these reasons, the fuel tank (5) can be prevented from being heated.
<Effect> Cooling efficiency of the muffler body is increased.
As illustrated in FIGS. 1 and 5, in front of the upper portion of the laterally projecting portion (22) of the tube cover rear wall (12a), the laterally projecting portion (22) of the tube cover rear wall (12a) and the ceiling wall (24). A trapping space (26) for engine cooling exhaust air (15) surrounded by the front wall (25) and the lateral wall (23) is formed, and a lateral outlet (26) facing the lateral wall (23) is formed in the trapping space (26). 27), a relay space (28) located in front of the tube cover rear wall (12a) is provided beside the side outlet (27), and the relay space (28) is provided from the side of the side outlet (27). Since the rear end inlet portion (18) of the horizontal ventilation gap (17) is exposed to the relay space (28) from above, the relay space (28) is exposed to the laterally protruding portion (22) of the rear wall (12a) of the pipe cover. The engine cooling exhaust air (15) diffused laterally along the surface floats along the laterally projecting portion (22) of the tube cover rear wall (12a), and relays from the capture space (26) to the lateral outlet (27). During (28) and through the floats rear entrance of the lateral air gap (17) to (18). Therefore, a lot of engine cooling exhaust air (15) is collected in the capture space (26) and flows into the side ventilation gap (17), and the cooling efficiency of the muffler body (7) is increased.
（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》 エンジンの搭載条件が緩和される。
図３に例示するように、シリンダヘッド(４)の前方にエアクリーナ(２１)を配置することにより、エンジンの前部にマフラ冷却排風出口(２０)とファンケース(８)とエアクリーナ(２１)とを集合させたので、ボンネットの一方にのみ外気連通口がある機械であっても、エンジンの前部を外気連通口に臨ませて、エンジンをボンネット内に収容すれば、この一方の外気連通口を介して、マフラ冷却排風の排出と、ファンケース(８)への冷却風の取り入れと、エアクリーナ(２１)への吸気の取り入れとを行うことができる。このため、エンジンの搭載条件が緩和される。
(Invention according to Claim 2)
In addition to the effect of the invention according to claim 1, the following effect is achieved.
<Effect> Engine mounting conditions are eased.
As shown in FIG. 3, by arranging an air cleaner (21) in front of the cylinder head (4), a muffler cooling exhaust air outlet (20), a fan case (8), and an air cleaner (21) are provided at the front of the engine. Therefore, even if the machine has an outside air communication port only on one side of the bonnet, if the front part of the engine faces the outside air communication port and the engine is housed in the bonnet, this one outside air communication The exhaust of the muffler cooling exhaust air, the intake of the cooling air into the fan case (8), and the intake air into the air cleaner (21) can be performed through the mouth. For this reason, the mounting conditions of the engine are eased.
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５は本発明の実施形態に係る空冷傾斜エンジンを説明する図、図６から図１０は本発明の参考形態に係る空冷傾斜エンジンを説明する図で、この実施形態と参考形態では、単気筒の空冷傾斜ガソリン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 5 are diagrams illustrating an air-cooled tilt engine according to an embodiment of the present invention, and FIGS. 6 to 10 are diagrams illustrating an air-cooled tilt engine according to a reference embodiment of the present invention. In this embodiment and the reference embodiment , FIG. A single-cylinder air-cooled inclined gasoline engine will be described.
本発明の実施形態の概要は、次の通りである。
図１に示すように、クランク軸中心軸線(１)と平行な向きに見て、クランクケース(２)からシリンダ(３)を斜め上向きに突出させ、このシリンダ(３)の突出端にシリンダヘッド(４)を組み付け、クランクケース(２)の上方に燃料タンク(５)を配置し、燃料タンク(５)の横でシリンダヘッド(４)の上方に排気マフラ(６)のマフラ本体(７)を配置している。
The outline of the embodiment of the present invention is as follows.
As shown in FIG. 1, when viewed in a direction parallel to the center axis (1) of the crankshaft, the cylinder (3) protrudes obliquely upward from the crankcase (2), and a cylinder head is formed at the protruding end of the cylinder (3). (4) is assembled, the fuel tank (5) is arranged above the crankcase (2), and the muffler body (7) of the exhaust muffler (6) above the cylinder head (4) beside the fuel tank (5). Is arranged.
排気マフラの冷却手段の構成は、次の通りである。
図３に示すように、クランク軸中心軸線(１)の架設方向を前後方向、その一方を前として、クランクケース(２)の前部にファンケース(８)を取り付け、図１に示すように、このファンケース(８)からシリンダ周壁とシリンダヘッド周壁とに沿ってエンジン冷却風通路(９)を設け、このエンジン冷却風通路(９)の終端でエンジン後部にエンジン冷却排風出口(１０)を設けている。シリンダヘッド(４)の後面にマフラ本体(７)の排気導入管(１１)を取り付け、この排気導入管(１１)の後部に管カバー(１２)を取り付け、管カバー後壁(１２ａ)をエンジン冷却排風出口(１０)にその後方から臨ませている。マフラ本体(７)に下面を開口させたマフラカバー(１４)を被せ、エンジン冷却排風出口(１０)から排出されたエンジン冷却排風(１５)を管カバー(１２)でマフラカバー(１４)内に案内するようにしている。
The configuration of the cooling means for the exhaust muffler is as follows.
As shown in FIG. 3, a fan case (8) is attached to the front portion of the crankcase (2) with the erection direction of the crankshaft central axis (1) being the front-rear direction and one of them as the front, as shown in FIG. An engine cooling air passage (9) is provided from the fan case (8) along the cylinder peripheral wall and the cylinder head peripheral wall, and an engine cooling exhaust air outlet (10) is provided at the rear of the engine at the end of the engine cooling air passage (9). Is provided. The exhaust introduction pipe (11) of the muffler body (7) is attached to the rear surface of the cylinder head (4), the pipe cover (12) is attached to the rear part of the exhaust introduction pipe (11), and the rear wall (12a) of the pipe cover is attached to the engine. It faces the cooling exhaust outlet (10) from behind. The muffler body (7) is covered with a muffler cover (14) whose bottom surface is opened, and the engine cooling exhaust air (15) discharged from the engine cooling exhaust air outlet (10) is covered with the pipe cover (12). I will guide you inside.
図１に示すように、エンジン冷却風通路(９)は、シリンダ(３)の上寄りに配置した上冷却風ガイド板(３６)の内側と、シリンダ(３)の下寄りに配置した下冷却風ガイド板(３７)の内側に形成されている。上冷却風ガイド板(３６)はシリンダ周壁とシリンダヘッド周壁の上側から後側に沿って形成され、下冷却風ガイド板(３７)はシリンダ周壁とシリンダヘッド周壁の下側から後側に沿って形成されている。エンジン冷却排風出口(１０)は、上冷却風ガイド板(３６)と下冷却風ガイド板(３７)の各終端縁の間に形成されている。 As shown in FIG. 1, the engine cooling air passage (9) includes an inner cooling air guide plate (36) disposed on the upper side of the cylinder (3) and a lower cooling air disposed on the lower side of the cylinder (3). It is formed inside the wind guide plate (37). The upper cooling air guide plate (36) is formed from the upper side to the rear side of the cylinder peripheral wall and the cylinder head peripheral wall, and the lower cooling air guide plate (37) is formed from the lower side to the rear side of the cylinder peripheral wall and the cylinder head peripheral wall. Is formed. The engine cooling exhaust air outlet (10) is formed between the end edges of the upper cooling air guide plate (36) and the lower cooling air guide plate (37).
排気マフラの冷却手段の工夫は、次の通りである。
図２に示すように、マフラカバー(１４)の燃料タンク寄り側壁(１６)とマフラ本体(７)との間に横通風隙間(１７)を設け、エンジン冷却排風出口(１０)から排出されたエンジン冷却排風(１５)を管カバー(１２)で横通風隙間(１７)の後端入口部(１８)に案内するようにし、マフラカバー(１４)の前端に横通風隙間(１７)の前端出口部(１９)と連通するマフラ冷却排風出口(２０)をあけている。
The device for cooling the exhaust muffler is as follows.
As shown in FIG. 2, a lateral ventilation gap (17) is provided between the side wall (16) near the fuel tank of the muffler cover (14) and the muffler body (7), and is discharged from the engine cooling exhaust air outlet (10). The engine cooling exhaust air (15) is guided by the pipe cover (12) to the rear end inlet (18) of the side ventilation gap (17), and the side ventilation gap (17) is formed at the front end of the muffler cover (14). A muffler cooling exhaust outlet (20) communicating with the front end outlet (19) is opened.
図１に示すように、マフラカバー(１１)はマフラ本体(７)に固定している。図５に示すように、マフラカバー(１１)は、下開口を有する矩形箱型で、天井壁の前部(３０)はマフラ冷却排風出口(２０)に向けて下り傾斜させている。図２に示すように、マフラカバー後壁(１４ａ)とマフラ本体(７)との間に後通風隙間(３８)を設け、マフラカバー(１４)の反燃料タンク側壁(３１)とマフラ本体(７)との間に第２の横通風隙間(３２)を設け、エンジン冷却排風出口(１０)から排出されたエンジン冷却排風(１５)を管カバー(１２)で後通風隙間(３８)に案内し、更にマフラカバー後壁(１４ａ)で第２の通風隙間(３２)の後端入口部(３３)に案内するようにし、この第２の横通風隙間(１７)の前端出口部(３４)とマフラカバー(１４)の前端のマフラ冷却排風出口(２０)を連通させている。この第２の通風隙間(３２)よりも燃料タンク寄りの通風隙間(１７)の方が横幅が大きく、通路断面積も大きい。また、マフラカバー(１４)の天井壁(１４ｂ)とマフラ本体(７)との間に上通風隙間(３９)を設け、エンジン冷却排風出口(１０)から排出されたエンジン冷却排風(１５)を管カバー(１２)で後通風隙間(３８)に案内し、更にマフラカバー後壁(１４ａ)で上通風隙間(３９)の後端入口部に案内するようにし、この上通風隙間(３９)の前端出口部とマフラカバー(１４)の前端のマフラ冷却排風出口(２０)を連通させている。 As shown in FIG. 1, the muffler cover (11) is fixed to the muffler body (7). As shown in FIG. 5, the muffler cover (11) has a rectangular box shape with a lower opening, and the front part (30) of the ceiling wall is inclined downward toward the muffler cooling exhaust air outlet (20). As shown in FIG. 2, a rear ventilation gap (38) is provided between the muffler cover rear wall (14a) and the muffler body (7), and the anti-fuel tank side wall (31) of the muffler cover (14) and the muffler body ( 7) is provided with a second side ventilation gap (32), and the engine cooling exhaust air (15) discharged from the engine cooling exhaust air outlet (10) is passed through the pipe cover (12) to the rear ventilation gap (38). To the rear end inlet portion (33) of the second ventilation gap (32) with the rear wall (14a) of the muffler cover, and the front end outlet portion of the second side ventilation gap (17) ( 34) and the muffler cooling exhaust air outlet (20) at the front end of the muffler cover (14) are communicated with each other. The lateral clearance and the passage cross-sectional area of the ventilation gap (17) closer to the fuel tank are larger than those of the second ventilation gap (32). Further, an air ventilation gap (39) is provided between the ceiling wall (14b) of the muffler cover (14) and the muffler body (7), and the engine cooling exhaust air (15) discharged from the engine cooling exhaust air outlet (10). ) Is guided to the rear ventilation gap (38) by the pipe cover (12), and is further guided to the rear end inlet of the upper ventilation gap (39) by the rear wall (14a) of the muffler cover. ) And the muffler cooling exhaust outlet (20) at the front end of the muffler cover (14) are communicated with each other.
管カバーの具体的構造は、次の通りである。
図１及び図５に示すように、管カバー後壁(１２ａ)をマフラカバー後壁(１４ａ)よりも燃料タンク(５)側の横方向に大きく張り出している。この管カバー後壁(１２ａ)の横張り出し部(２２)の横縁部から前向きに横壁(２３)を導出し、管カバー後壁(１２ａ)の横張り出し部(２２)の上縁部から前向きに天井壁(２４)を導出し、この天井壁(２４)の前端縁から下向きに前壁(２５)を導出している。管カバー後壁(１２ａ)の横張り出し部(２２)の上部前方に、管カバー後壁(１２ａ)の横張り出し部(２２)と天井壁(２４)と前壁(２５)と横壁(２３)で囲まれたエンジン冷却排風(１５)の捕捉空間(２６)を形成している。この捕捉空間(２６)に上記横壁(２３)と対向する横出口(２７)を設け、この横出口(２７)の横に管カバー後壁(１２ａ)の前方に位置する中継空間(２８)を設けている。上記横出口(２７)にその横からこの中継空間(２８)を臨ませ、この中継空間(２８)にその上方から前記通風隙間(１７)の後端入口部(１８)を臨ませている。なお、管カバー後壁(１２ａ)の反燃料タンク側の横縁から前向きに横壁(３５)を導出している。また、マフラカバー(１４)はマフラ本体(７)の天井と左右側壁に設けたスペーサステー(７ａ)にボルトで固定している。管カバー(１２)は排気導入管(１１)のカバー取付座(１１ａ)にボルトで固定している。
The specific structure of the tube cover is as follows.
As shown in FIGS. 1 and 5, the pipe cover rear wall (12a) protrudes more in the lateral direction on the fuel tank (5) side than the muffler cover rear wall (14a). The lateral wall (23) is led forward from the lateral edge of the laterally projecting portion (22) of the tube cover rear wall (12a), and is directed forward from the upper edge of the laterally projecting portion (22) of the tubular cover rear wall (12a). The ceiling wall (24) is led out from the front wall, and the front wall (25) is led down from the front edge of the ceiling wall (24). In front of the upper portion of the laterally projecting portion (22) of the tube cover rear wall (12a), the laterally projecting portion (22), the ceiling wall (24), the front wall (25), and the lateral wall (23) of the tube cover rear wall (12a) A trapping space (26) for the engine cooling exhaust air (15) surrounded by is formed. A lateral outlet (27) facing the lateral wall (23) is provided in the trapping space (26), and a relay space (28) positioned in front of the tube cover rear wall (12a) is provided beside the lateral outlet (27). Provided. The relay outlet (27) faces the relay space (28) from the side, and the relay space (28) faces the rear end inlet (18) of the ventilation gap (17) from above. The horizontal wall (35) is led forward from the horizontal edge of the tube cover rear wall (12a) on the side opposite to the fuel tank. The muffler cover (14) is fixed to the spacer stay (7a) provided on the ceiling and the left and right side walls of the muffler body (7) with bolts. The tube cover (12) is fixed to the cover mounting seat (11a) of the exhaust introduction tube (11) with a bolt.
他の工夫は、次の通りである。
図４に示すように、シリンダヘッド(４)の前方にエアクリーナ(２１)を配置することにより、エンジンの前部にマフラ冷却排風出口(２０)とファンケース(８)とエアクリーナ(２１)とを集合させている。
Other ideas are as follows.
As shown in FIG. 4, by arranging an air cleaner (21) in front of the cylinder head (4), a muffler cooling exhaust outlet (20), a fan case (8), and an air cleaner (21) are provided at the front of the engine. Are gathered.
本発明の参考形態は、実施形態とは管カバーの具体的構造が異なる。
すなわち、図６及び図１０に示すように、マフラカバー後壁(１４ａ)と管カバー後壁(１２ａ)とを一体化させている。管カバー(１２ａ)の燃料タンク(５)側の横縁部はマフラカバー後壁(１４ａ)の燃料タンク(５)側の横縁部から横方向に張り出してはおらず、実施形態の捕捉空間は設けていない。他の構造と機能は実施形態と同じであり、図６から図１０中、実施形態と同一の要素には同一の符号を付しておく。例えば、図６に示すように、マフラカバー(１４)をマフラ本体(７)に固定し、管カバー(１２)を排気マフラ(６)の排気導入管(１１)に固定している点は、実施形態と同じである。
この参考形態では、図６及び図１０に示すように、マフラカバー後壁(１４ａ)と管カバー後壁(１２ａ)とを一体化させ、マフラカバー(１４)をマフラ本体(７)に固定し、管カバー(１２)をマフラ本体(７)の排気導入管(１１)に固定したので、エンジンの振動時に、マフラカバー後壁(１４ａ)と管カバー後壁(１２ａ)の連結部分にかかる負荷の分だけ、マフラ本体(７)と排気導入管(１１)との連結部分にかかる負荷が軽減されるため、マフラ本体(７)と排気導入管(１１)との連結部分の損傷が起こりにくい。
Reference embodiment of the present invention, specifically the structure of the tube sleeve is different from the embodiment.
That is, as shown in FIGS. 6 and 10, the muffler cover rear wall (14a) and the tube cover rear wall (12a) are integrated. Fuel tank (5) side of the lateral edges is Orazu is protruding laterally from the lateral edges of the fuel tank (5) side of the muffler cover rear wall (14a) of the tube sleeve (12a), trapping space of the embodiment Not provided. Other structure and function are the same as the embodiment, in FIG. 10 from FIG. 6, the same components as the embodiment previously designated by the same reference numerals. For example, as shown in FIG. 6, the muffler cover (14) is fixed to the muffler body (7), and the tube cover (12) is fixed to the exhaust introduction pipe (11) of the exhaust muffler (6). This is the same as the embodiment .
In this reference embodiment, as shown in FIGS. 6 and 10, the muffler cover rear wall (14a) and the tube cover rear wall (12a) are integrated, and the muffler cover (14) is fixed to the muffler body (7). Since the pipe cover (12) is fixed to the exhaust introduction pipe (11) of the muffler body (7), the load applied to the connecting portion between the muffler cover rear wall (14a) and the pipe cover rear wall (12a) during engine vibration. Therefore, the load applied to the connecting portion between the muffler main body (7) and the exhaust introduction pipe (11) is reduced, so that the connecting portion between the muffler main body (7) and the exhaust introduction pipe (11) is hardly damaged. .
(１) クランク軸中心軸線
(２) クランクケース
(３) シリンダ
(４) シリンダヘッド
(５) 燃料タンク
(６) 排気マフラ
(７) マフラ本体
(８) ファンケース
(９) エンジン冷却風通路
(１０) エンジン冷却排風出口
(１１) 排気導入管
(１２) 管カバー
(１２ａ) 管カバー後壁
(１４) マフラカバー
(１４ａ) マフラカバー後壁
(１５) エンジン冷却排風
(１６) 燃料タンク寄り側壁
(１７) 横通風隙間
(１８) 後端入口部
(１９) 前端出口部
(２０) マフラ冷却排風出口
(２１) エアクリーナ
(２２) 横張り出し部
(２３) 横壁
(２４) 天井壁
(２５) 前壁
(２６) 捕捉空間
(２７) 横出口
(２８) 中継空間
(1) Crankshaft center axis
(2) Crankcase
(3) Cylinder
(4) Cylinder head
(5) Fuel tank
(6) Exhaust muffler
(7) Muffler body
(8) Fan case
(9) Engine cooling air passage
(10) Engine cooling exhaust outlet
(11) Exhaust pipe
(12) Tube cover
(12a) Tube cover rear wall
(14) Muffler cover
(14a) Muffler cover rear wall
(15) Engine cooling exhaust
(16) Side wall near the fuel tank
(17) Horizontal draft clearance
(18) Rear end entrance
(19) Front end exit
(20) Muffler cooling exhaust outlet
(21) Air cleaner
(22) Side overhang
(23) Side wall
(24) Ceiling wall
(25) Front wall
(26) Capture space
(27) Side exit
(28) Relay space
Claims (2)
クランク軸中心軸線(１)の架設方向を前後方向、その一方を前として、クランクケース(２)の前部にファンケース(８)を取り付け、このファンケース(８)からシリンダ周壁とシリンダヘッド周壁とに沿ってエンジン冷却風通路(９)を設け、このエンジン冷却風通路(９)の終端でエンジン後部にエンジン冷却排風出口(１０)を設け、シリンダヘッド(４)の後面にマフラ本体(７)の排気導入管(１１)を取り付け、この排気導入管(１１)の後部に管カバー(１２)を取り付け、管カバー後壁(１２ａ)をエンジン冷却排風出口(１０)にその後方から臨ませ、マフラ本体(７)に下面を開口させたマフラカバー(１４)を被せ、エンジン冷却排風出口(１０)から排出されたエンジン冷却排風(１５)を管カバー(１２)でマフラカバー(１４)内に案内するようにした、空冷傾斜エンジンにおいて、
マフラカバー(１４)の燃料タンク寄り側壁(１６)とマフラ本体(７)との間に横通風隙間(１７)を設け、エンジン冷却排風出口(１０)から排出されたエンジン冷却排風(１５)を管カバー(１２)で横通風隙間(１７)の後端入口部(１８)に案内するようにし、マフラカバー(１４)の前端に横通風隙間(１７)の前端出口部(１９)と連通するマフラ冷却排風出口(２０)をあけ、
管カバー後壁(１２ａ)をマフラカバー後壁(１４ａ)よりも燃料タンク(５)側の横方向に大きく張り出し、この管カバー後壁(１２ａ)の横張り出し部(２２)の横縁部から前向きに横壁(２３)を導出し、管カバー後壁(１２ａ)の横張り出し部(２２)の上縁部から前向きに天井壁(２４)を導出し、この天井壁(２４)の前端縁から下向きに前壁(２５)を導出し、管カバー後壁(１２ａ)の横張り出し部(２２)の上部前方に、管カバー後壁(１２ａ)の横張り出し部(２２)と天井壁(２４)と前壁(２５)と横壁(２３)で囲まれたエンジン冷却排風(１５)の捕捉空間(２６)を形成し、この捕捉空間(２６)に上記横壁(２３)と対向する横出口(２７)を設け、この横出口(２７)の横に管カバー後壁(１２ａ)の前方に位置する中継空間(２８)を設け、上記横出口(２７)にその横からこの中継空間(２８)を臨ませ、この中継空間(２８)にその上方から前記横通風隙間(１７)の後端入口部(１８)を臨ませた、ことを特徴とする空冷傾斜エンジン。 Seen in a direction parallel to the center axis (1) of the crankshaft, the cylinder (3) protrudes obliquely upward from the crankcase (2), and the cylinder head (4) is assembled to the protruding end of the cylinder (3). The fuel tank (5) is disposed above the case (2), the muffler body (7) of the exhaust muffler (6) is disposed beside the fuel tank (5) and above the cylinder head (4),
A fan case (8) is attached to the front part of the crankcase (2) with the installation direction of the crankshaft center axis (1) as the front-rear direction and one of them as the front, and the cylinder peripheral wall and cylinder head peripheral wall from this fan case (8) And an engine cooling air passage (9), an engine cooling exhaust air outlet (10) is provided at the rear of the engine at the end of the engine cooling air passage (9), and a muffler body ( 7) The exhaust introduction pipe (11) is attached, a pipe cover (12) is attached to the rear part of the exhaust introduction pipe (11), and the rear wall (12a) of the pipe cover is connected to the engine cooling exhaust air outlet (10) from behind. Cover the muffler body (7) with a muffler cover (14) whose bottom surface is open, and cover the engine cooling exhaust air (15) discharged from the engine cooling exhaust air outlet (10) with the pipe cover (12). (14) Air-cooled slanted air that is guided inside In
A side ventilation gap (17) is provided between the fuel tank side wall (16) of the muffler cover (14) and the muffler body (7), and the engine cooling exhaust air (15) discharged from the engine cooling exhaust outlet (10). ) Is guided by the tube cover (12) to the rear end inlet portion (18) of the side ventilation gap (17), and the front end outlet portion (19) of the side ventilation gap (17) is connected to the front end of the muffler cover (14). Open the communicating muffler cooling exhaust outlet (20) ,
The tube cover rear wall (12a) is greatly protruded in the lateral direction on the fuel tank (5) side than the muffler cover rear wall (14a), and the tube cover rear wall (12a) is extended from the lateral edge portion of the laterally projecting portion (22). The horizontal wall (23) is led out forward, the ceiling wall (24) is led out from the upper edge of the laterally projecting portion (22) of the rear wall (12a) of the tube cover, and the front wall of the ceiling wall (24) is led out. The front wall (25) is led out downward, and the horizontal overhanging portion (22) and the ceiling wall (24) of the tube covering rear wall (12a) are placed in front of the horizontal overhanging portion (22) of the tube covering rear wall (12a). A trapping space (26) for engine cooling exhaust air (15) surrounded by the front wall (25) and the lateral wall (23) is formed, and a lateral outlet (26) facing the lateral wall (23) is formed in the trapping space (26). 27), a relay space (28) located in front of the tube cover rear wall (12a) is provided next to the side outlet (27), and the side outlet (27) is located in the middle from the side. To face the space (28), rear inlet has to face (18), air-cooled inclined engine, characterized in that said from above to the relay space (28) transverse ventilation gap (17).
シリンダヘッド(４)の前方にエアクリーナ(２１)を配置することにより、エンジンの前部にマフラ冷却排風出口(２０)とファンケース(８)とエアクリーナ(２１)とを集合させた、ことを特徴とする空冷傾斜エンジン。 The air-cooled tilt engine according to claim 1,
By arranging the air cleaner (21) in front of the cylinder head (4), the muffler cooling exhaust outlet (20), the fan case (8) and the air cleaner (21) are assembled at the front of the engine. A featured air-cooled tilt engine.
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| JP2006155925A JP4649372B2 (en) | 2006-06-05 | 2006-06-05 | Air-cooled tilt engine |
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| JP2006155925A JP4649372B2 (en) | 2006-06-05 | 2006-06-05 | Air-cooled tilt engine |
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| JPS5515366U (en) * | 1978-07-18 | 1980-01-31 | ||
| JPS60209634A (en) * | 1984-04-02 | 1985-10-22 | Honda Motor Co Ltd | Portable type engine-driven work machine |
| JPH11210457A (en) * | 1998-01-27 | 1999-08-03 | Mitsubishi Heavy Ind Ltd | Exhaust pipe cover mounting structure of engine |
| JP2005226556A (en) * | 2004-02-13 | 2005-08-25 | Kubota Corp | Air-cooled engine |
-
2006
- 2006-06-05 JP JP2006155925A patent/JP4649372B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5515366U (en) * | 1978-07-18 | 1980-01-31 | ||
| JPS60209634A (en) * | 1984-04-02 | 1985-10-22 | Honda Motor Co Ltd | Portable type engine-driven work machine |
| JPH11210457A (en) * | 1998-01-27 | 1999-08-03 | Mitsubishi Heavy Ind Ltd | Exhaust pipe cover mounting structure of engine |
| JP2005226556A (en) * | 2004-02-13 | 2005-08-25 | Kubota Corp | Air-cooled engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007321722A (en) | 2007-12-13 |
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