JPH06344779A - Soundproof and cooling system of engine room - Google Patents
Soundproof and cooling system of engine roomInfo
- Publication number
- JPH06344779A JPH06344779A JP15452193A JP15452193A JPH06344779A JP H06344779 A JPH06344779 A JP H06344779A JP 15452193 A JP15452193 A JP 15452193A JP 15452193 A JP15452193 A JP 15452193A JP H06344779 A JPH06344779 A JP H06344779A
- Authority
- JP
- Japan
- Prior art keywords
- engine room
- under cover
- engine
- air
- sound
- 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
Landscapes
- Body Structure For Vehicles (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明はフォークリフトやショ
ベルローダ等のエンジン式産業車両のエンジンルームの
防音・冷却装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproofing / cooling device for an engine room of an engine type industrial vehicle such as a forklift or shovel loader.
【0002】[0002]
【従来の技術】エンジンルームの下側を開放した構造を
有する従来の産業車両では、エンジンルームから放出す
る騒音(主にエンジン音)が大きく、かつエンジンルー
ム内の諸設備の汚損等の不具合があり、この不具合の解
決手段として図5,図6に示すアンダーカバーCによっ
てエンジンルーム下面を覆った低騒音仕様のものが提供
されている。 図7は標準仕様のフォークリフトの全体
を示す側面図である。従来エンジンルーム下面を覆う産
業車両のアンダーカバーの構造に関しては例えば実開昭
62−125648号、実開平2−88826号の各公
報に示すようなものが提供されている。すなわち実開昭
62−125648号ではサイドフレームの下端部に取
り付けられるアンダーカバーの前端縁を斜め下方へ折り
曲げて、空気導入部を形成している。そしてアンダーカ
バーには、図4に示した複数個の空気導入部を前後に併
設して冷却効果を高めるようにしたものである。また実
開平2−88826号では、エンジンルーム内への空気
はアンダーカバーに形成された取り入れ口から行なわ
れ、取り入れ口から流入した空気を、作動油タンクの壁
面に向けて流動させる案内部材を設けたことで、作動油
タンク壁面に対する冷却空気の接触を積極化し、作動油
の放熱作用を積極的に行なうものであった。さらにアン
ダーカバーには図3に示した複数個の空気導入部を前後
に併設もしていた。図3,図4,図5,図6,図7にお
いてeはエンジン、dは吸音材、cはアンダーカバー、
sはサイドフレーム、rはラジエータ、wはカウンタウ
エイト、fはファン、pは排気孔を示す。2. Description of the Related Art In a conventional industrial vehicle having a structure in which the lower side of an engine room is opened, noise (mainly engine sound) emitted from the engine room is large, and problems such as pollution of various facilities in the engine room occur. As a solution to this problem, a low noise specification in which the lower surface of the engine room is covered with an under cover C shown in FIGS. 5 and 6 is provided. FIG. 7 is a side view showing the entire standard specification forklift. Conventionally, as a structure of an undercover of an industrial vehicle that covers a lower surface of an engine room, for example, those disclosed in Japanese Utility Model Publication No. 62-125648 and Japanese Utility Model Publication No. 2-88826 are provided. That is, in Japanese Utility Model Laid-Open No. 62-125648, the air inlet is formed by bending the front edge of the under cover attached to the lower end of the side frame obliquely downward. The plurality of air introducing portions shown in FIG. 4 are provided side by side on the under cover to enhance the cooling effect. In Japanese Utility Model Laid-Open No. 2-88826, air is introduced into the engine room through an intake port formed in the undercover, and a guide member is provided for causing the air flowing from the intake port to flow toward the wall surface of the hydraulic oil tank. Therefore, the contact of the cooling air with the wall surface of the hydraulic oil tank is positively performed, and the heat radiation of the hydraulic oil is positively performed. Further, a plurality of air introduction parts shown in FIG. 3, FIG. 4, FIG. 5, FIG. 6, and FIG. 7, e is an engine, d is a sound absorbing material, c is an under cover,
s is a side frame, r is a radiator, w is a counterweight, f is a fan, and p is an exhaust hole.
【0003】[0003]
【発明が解決しようとする課題】しかし上述したアンダ
ーカバーによる閉塞構造の場合は、図6に示す構造とな
り、空気取り入れが不十分であることから、エンジン冷
却不足によるエンジンオーバーヒートを誘発する原因と
なっており、冷却効果を高めるための図3,図4に示し
た空気導入部や案内部材を設けるが、そこから外部へ放
射される騒音が、路面で反射してオペ耳騒音や周囲騒音
を大きくしてしまうという課題があった。すなわち実開
昭62−125648号では、複数個の空気導入部から
騒音源であるエンジン壁面から放出された音が直接外部
に伝搬し、路面で反射されてオペ耳騒音、周囲騒音を大
きくしてしまい、実開平2−88826号でも同様に、
作動油タンクは冷却されるものの、アンダーカバーに形
成された空気取り入れ口から騒音源であるエンジン壁面
から放射された音が直接外部に伝搬し、路面で反射され
てオペ耳騒音、周囲騒音を大きくしてしまっていた。However, in the case of the above-mentioned closed structure with the undercover, the structure shown in FIG. 6 is obtained, and the air intake is insufficient, which causes engine overheat due to insufficient engine cooling. In order to enhance the cooling effect, the air introduction part and the guide member shown in Fig. 3 and Fig. 4 are provided. However, the noise radiated to the outside is reflected on the road surface and the operation ear noise and ambient noise are increased. There was a problem of doing it. That is, in Japanese Utility Model Laid-Open No. 62-125648, sound emitted from a plurality of air introduction sections from the engine wall surface, which is a noise source, directly propagates to the outside and is reflected on the road surface to increase operation ear noise and ambient noise. In fact, the same is true for Kaikaihei 2-88826.
Although the hydraulic oil tank is cooled, the noise radiated from the engine wall, which is a noise source, directly propagates to the outside from the air intake port formed in the under cover, and is reflected on the road surface to increase operation ear noise and ambient noise. I had done it.
【0004】[0004]
【課題を解決するための手段】この発明は上記の課題に
鑑みなされたもので、アンダーカバーによる低騒音仕様
の産業車両において、車両の走行による外気を積極的に
エンジンルーム内に導入すると共に、かつエンジンの壁
面から放射された音が、空気導入部から直接外部に伝搬
することを防止するようにした構造、すなわちアンダー
カバーの前方向に、アンダーカバーを斜め下方に折り曲
げると共に、斜め下方に折り曲げた部分と前後方向にラ
ップさせて、その上側を上方に折り曲げ、上下方向にあ
る間隔を持った空気導入部を形成したアンダーカバーを
使用する。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in an industrial vehicle of low noise specification with an undercover, outside air is actively introduced into the engine room while the vehicle is running, and And the structure that prevents the sound radiated from the wall of the engine from directly propagating to the outside from the air introduction part, that is, the under cover is bent diagonally downward in the front direction of the under cover and is also bent diagonally downward. The undercover is used by wrapping it in the front-back direction and bending the upper side upward so as to form an air introduction part with a certain interval in the vertical direction.
【0005】[0005]
【作用】この発明は上述の構造を持つアンダーカバーの
ため、エンジンルームへの外気の導入を数箇所の空気導
入部により積極的に行なうことができる外、空気導入部
の通路の両面に接着された吸音材により直接音の低減と
反射音を吸収して、直接音、反射音の外部への伝搬を防
止し、騒音の漏れを可及的に低減できるもので、周囲騒
音の低減に効果が大きい。Since the present invention has the under cover having the above-mentioned structure, the outside air can be positively introduced into the engine room by the air introducing portions at several places, and the air is adhered to both sides of the passage of the air introducing portion. The sound absorbing material reduces the direct sound and absorbs the reflected sound, prevents the direct sound and the reflected sound from propagating to the outside, and reduces the noise leakage as much as possible, which is effective in reducing the ambient noise. large.
【0006】[0006]
【実施例】以下この発明の実施例について図面により説
明する。図1はこの発明によるアンダーカバー7の実施
例を示す構造図で、図2は図1の実施例において、エン
ジン4の壁面から放出された音波がアンダーカバー7の
空気導入部11から外部へ伝搬する過程を示す模式図で
ある図1に示すように、アンダーカバー7には2箇所の
空気導入部11が設けてあり、適宜間隔をおいて車幅方
向に長く開口したスリット12は、スリット12の下側
に斜め前方に傾斜状に突き出したガイド片13と、ガイ
ド片13と前後にラップさせてスリット12上側に、あ
る間隔を持ち、斜め後方に傾斜状になったガイド片14
とからなる空気導入部11を形成している。そのため車
両走行時には矢印で示すように、アンダーカバー7の空
気導入部11のスリット12の、上下それぞれのガイド
片13、14で形成される隙間を、外気が案内されてア
ンダーカバー7上面に導かれる。すなわちエンジンルー
ムに走行時空気が積極的に取り入れられ、その空気はエ
ンジン4下部からエンジン4壁面へと導かれ、ラジエー
タ6を通り、排気孔3aから車体後方へ排出される。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a structural diagram showing an embodiment of an under cover 7 according to the present invention, and FIG. 2 is a view showing that in the embodiment of FIG. 1, sound waves emitted from the wall surface of the engine 4 propagate to the outside from the air introduction portion 11 of the under cover 7. As shown in FIG. 1 which is a schematic view showing the process of forming the slits, the under cover 7 is provided with two air introducing portions 11, and the slits 12 that are long at the appropriate intervals in the vehicle width direction are the slits 12. A guide piece 13 that projects obliquely forward to the lower side, and a guide piece 14 that wraps around the guide piece 13 in the front-rear direction and has a certain interval on the upper side of the slit 12 and is inclined obliquely rearward.
To form an air introduction portion 11. Therefore, when the vehicle is traveling, as shown by the arrow, the outside air is guided through the gap formed by the upper and lower guide pieces 13 and 14 of the slit 12 of the air introducing portion 11 of the under cover 7 to be guided to the upper surface of the under cover 7. . That is, air is positively taken into the engine room during traveling, the air is guided from the lower part of the engine 4 to the wall surface of the engine 4, passes through the radiator 6, and is discharged from the exhaust hole 3a to the rear of the vehicle body.
【0007】更に音源(エンジン音、トランスミッショ
ン音等)から放射される音響パワーWoのうち、一部は
透過音のパワーWtとなり、一部はアンダーカバー7の
上面に接着された吸音材16等で吸収されるパワーWa
となり、一部は吸音材16に全く入射しない直接音のパ
ワーWdやアンダーカバー7から反射されて、空気導入
部11のスリット12から漏れる反射音のパワーWrと
なって外部に伝搬する。この関係を示したものが次式で
ある。 Wo=Wt+Wa+Wd+Wr すなわち図2に示したこの発明の構造ではガイド片1
3,14からなる空気導入部11の、通路であるスリッ
ト12の両側に接着された吸音材16によって、直接音
を低減し、反射音を吸収して、直接音、反射音共に外部
に伝搬するのを防止し、騒音の漏れを可及的に低減でき
るので、周囲騒音の低減効果が著しい。Further, of the acoustic power Wo radiated from the sound source (engine sound, transmission sound, etc.), a part thereof becomes the power Wt of the transmitted sound, and a part thereof is the sound absorbing material 16 adhered to the upper surface of the under cover 7. Power absorbed
Therefore, a part of the power Wd of the direct sound that does not enter the sound absorbing material 16 at all or the power Wr of the reflected sound that is reflected from the under cover 7 and leaks from the slit 12 of the air introduction portion 11 propagates to the outside. The following equation shows this relationship. Wo = Wt + Wa + Wd + Wr That is, in the structure of the present invention shown in FIG.
The sound absorbing material 16 adhered to both sides of the slit 12 which is the passage of the air introduction part 11 made of 3, 14 reduces the direct sound, absorbs the reflected sound, and propagates both the direct sound and the reflected sound to the outside. Since the noise can be prevented and the leakage of noise can be reduced as much as possible, the effect of reducing ambient noise is remarkable.
【0008】[0008]
【発明の効果】この発明は以上詳述したように、エンジ
ンルーム下部を覆うアンダーカバーの前後左右に適宜間
隔をおいて、車幅方向に長く開口したスリットとスリッ
ト下側に斜め前方に傾斜状に突き出したガイド片と、ガ
イド片と前後にラップさせて、スリット上側に間隔を持
ち、斜め後方に傾斜状に設けたガイド片からなる空気導
入部を形成しているので、車両走行時には空気導入部か
ら外気をアンダーカバー上方のエンジンルームへ積極的
に取り入れ、エンジンルーム内の熱気を十分に掃気し、
冷却効果を損なうことなく、アンダーカバー上面及び空
気導入部通路の両面に接着された吸音材により、エンジ
ン音やトランスミッション音の直接音を吸収し、外部に
直接音が伝搬するのを防止して、騒音の漏れを可及的に
低減できる。As described above in detail, the present invention has a slit that is long in the vehicle width direction and is inclined obliquely forward to the lower side of the slit, with an appropriate interval in front, back, left and right of the under cover that covers the lower part of the engine room. Since the air guide part is formed by the guide piece protruding to the front and the guide piece that is wrapped back and forth with a gap above the slit and is provided obliquely rearward, it is possible to introduce air when the vehicle is traveling. The outside air is positively taken into the engine room above the undercover from the section, and the hot air in the engine room is sufficiently scavenged.
Without damaging the cooling effect, the sound absorbing material adhered to both the upper surface of the undercover and both sides of the air introduction passage, absorbs the direct sound of the engine sound and the transmission sound, and prevents the direct sound from propagating to the outside. Noise leakage can be reduced as much as possible.
【図1】この発明によるアンダーカバーの実施例を示す
構造図である。FIG. 1 is a structural view showing an embodiment of an undercover according to the present invention.
【図2】図1の実施例において、エンジン壁面から放射
された音波がアンダーカバーの空気導入部から外部へ伝
搬する過程を示す模式図である。FIG. 2 is a schematic diagram showing a process in which a sound wave radiated from an engine wall surface propagates from an air introduction portion of an undercover to the outside in the embodiment of FIG.
【図3】従来のアンダーカバーにおいてエンジン壁面か
ら放射された音波がアンダーカバーの空気導入部から伝
搬する過程を示す模式図である。FIG. 3 is a schematic diagram showing a process in which a sound wave radiated from an engine wall surface propagates from an air introducing portion of the under cover in the conventional under cover.
【図4】従来の別のアンダーカバーにおいてエンジン壁
面から放射された音波がアンダーカバーの空気導入部か
ら外部へ伝搬する過程を示す模式図である。FIG. 4 is a schematic diagram showing a process in which a sound wave emitted from an engine wall surface propagates from an air introducing portion of the undercover to the outside in another conventional undercover.
【図5】アンダーカバーの取り付け説明図である。FIG. 5 is an explanatory view of attaching an under cover.
【図6】従来のアンダーカバーの構造説明図である。FIG. 6 is a structural explanatory view of a conventional under cover.
【図7】フォークリフトの全体を示す側面図である。FIG. 7 is a side view showing the entire forklift.
4 エンジン 7 アンダーカバー 11 空気導入部 12スリット 13 ガイド片 14 ガイド片 16 吸音材 4 Engine 7 Undercover 11 Air Inlet 12 Slit 13 Guide Piece 14 Guide Piece 16 Sound Absorbing Material
Claims (3)
バー7の前方向に、アンダーカバー7を斜め下方に折り
曲げてガイド13片とすると共に、斜め下方に折り曲げ
た部分と前後方向にラップさせて、その上側は上方に折
り曲げたガイド片14とし、上下方向にあるスリット1
2を持った空気導入部11を形成するようにしたことを
特徴とする、産業車両におけるエンジンルームの防音・
冷却装置。1. An undercover 7 that covers the lower surface of an engine room is bent diagonally downward to form a guide 13 piece, and the diagonally bent portion is lapped in the front-back direction. The upper side is a guide piece 14 bent upward, and the slit 1 in the vertical direction is used.
A sound insulation of an engine room in an industrial vehicle, characterized in that an air introduction portion 11 having 2 is formed.
Cooling system.
導入部11を前後左右に併設してなる、請求項1記載の
エンジンルームの防音・冷却装置2. The soundproofing / cooling device for an engine room according to claim 1, wherein the undercover 7 is provided with a plurality of air introducing portions 11 arranged side by side in the front-rear direction.
気導入部11のスリット12の両面に吸音材16を接
着、取り付けてなる請求項1または請求項2記載のエン
ジンルームの防音・冷却装置3. The soundproofing / cooling device for an engine room according to claim 1 or 2, wherein the undercover 7 has a sound absorbing material 16 adhered and attached to an upper surface thereof and both sides of the slit 12 of the air introduction portion 11.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15452193A JP3173538B2 (en) | 1993-06-02 | 1993-06-02 | Engine room soundproofing / cooling system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15452193A JP3173538B2 (en) | 1993-06-02 | 1993-06-02 | Engine room soundproofing / cooling system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06344779A true JPH06344779A (en) | 1994-12-20 |
JP3173538B2 JP3173538B2 (en) | 2001-06-04 |
Family
ID=15586076
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15452193A Expired - Fee Related JP3173538B2 (en) | 1993-06-02 | 1993-06-02 | Engine room soundproofing / cooling system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3173538B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008208557A (en) * | 2007-02-23 | 2008-09-11 | Shin Caterpillar Mitsubishi Ltd | Cooling air exhaust structure of working machine |
JP2011126498A (en) * | 2009-12-21 | 2011-06-30 | Daihatsu Motor Co Ltd | Engine-associated structure of vehicle body lower segment |
JP2011240827A (en) * | 2010-05-18 | 2011-12-01 | Toyota Motor Corp | Structure for introducing cooling air |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS578114U (en) * | 1980-06-17 | 1982-01-16 | ||
JPS62125648U (en) * | 1986-02-01 | 1987-08-10 |
-
1993
- 1993-06-02 JP JP15452193A patent/JP3173538B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS578114U (en) * | 1980-06-17 | 1982-01-16 | ||
JPS62125648U (en) * | 1986-02-01 | 1987-08-10 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008208557A (en) * | 2007-02-23 | 2008-09-11 | Shin Caterpillar Mitsubishi Ltd | Cooling air exhaust structure of working machine |
JP2011126498A (en) * | 2009-12-21 | 2011-06-30 | Daihatsu Motor Co Ltd | Engine-associated structure of vehicle body lower segment |
JP2011240827A (en) * | 2010-05-18 | 2011-12-01 | Toyota Motor Corp | Structure for introducing cooling air |
Also Published As
Publication number | Publication date |
---|---|
JP3173538B2 (en) | 2001-06-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |