JPH0217160Y2 - - Google Patents
Info
- Publication number
- JPH0217160Y2 JPH0217160Y2 JP16038783U JP16038783U JPH0217160Y2 JP H0217160 Y2 JPH0217160 Y2 JP H0217160Y2 JP 16038783 U JP16038783 U JP 16038783U JP 16038783 U JP16038783 U JP 16038783U JP H0217160 Y2 JPH0217160 Y2 JP H0217160Y2
- Authority
- JP
- Japan
- Prior art keywords
- noise
- cover
- gap
- prevention cover
- noise prevention
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000002265 prevention Effects 0.000 claims description 13
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 description 5
- 239000011358 absorbing material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Description
【考案の詳細な説明】
本考案は、内燃機関から外部に伝播する騒音を
防ぐ内燃機関の騒音防止用カバーに関し、さらに
具体的には、エンジン本体と付属機器類との隙間
に発生する定在波対策としての緩衝材の充填を不
要とした内燃機関の騒音防止用カバーに関する。[Detailed description of the invention] The present invention relates to a noise prevention cover for an internal combustion engine that prevents noise propagating from the internal combustion engine to the outside. This invention relates to a noise prevention cover for an internal combustion engine that does not require filling with a buffer material as a countermeasure against waves.
従来、シリンダボデイやオイルパンを二重カバ
ーと称する防音カバーで掩蔽し、騒音が外部に漏
れることを防止していたが、これだけでは効果が
低いため、防音カバーの内部に吸音材を充填する
ことが提案されている（例えば実開昭51−97636、
実開昭55−177030）。しかし、防音カバーの内部
に吸音材等を充填したにも拘らず騒音は減少せ
ず、効果が低いため、この原因を追及した結果、
エンジン本体とこれに付属装着する機器類との隙
間に定在波が発生し、これが騒音原因となつてい
ることが解明された。 Conventionally, the cylinder body and oil pan were covered with a soundproof cover called a double cover to prevent noise from leaking to the outside, but this alone was not very effective, so the inside of the soundproof cover was filled with sound-absorbing material. has been proposed (for example, Utility Model Application Publication No. 51-97636,
Jitsukai 55-177030). However, despite filling the inside of the soundproof cover with sound-absorbing materials, the noise did not decrease and the effect was low.As a result of investigating the cause of this, we found that
It was discovered that standing waves were generated in the gap between the engine itself and the equipment attached to it, and that this was the cause of the noise.
そこで、本願出願人は、前記定在波の発生を阻
止する手段としてエンジン本体と付属機器類との
隙間に緩衝材を充填し、騒音を防止する技術を提
案した（実開昭53−75647）。この隙間への緩衝材
充填はほぼ完全に騒音を防止できるが、作業性が
悪く、コスト高をまぬがれない点に難点がある。 Therefore, the applicant proposed a technology to prevent noise by filling the gap between the engine body and the attached equipment with a buffer material as a means to prevent the generation of the standing waves (Utility Model Application Publication No. 53-75647). . Filling this gap with cushioning material can almost completely prevent noise, but it has the drawbacks of poor workability and high costs.
この問題の解消に取組んだ本考案者は、研究を
重ねた結果、エンジン本体を掩蔽するカバーと付
属機器との隙間が通常30〜40mmあり、ここに定在
波が発生するが、この隙間を小さくして例えば２
〜３mm程度とすると定在波の発生を見なくなると
の知見を得るに至つた。 The inventor of the present invention, who worked on solving this problem, found out after repeated research that there is usually a gap of 30 to 40 mm between the cover that covers the engine body and the attached equipment, and standing waves are generated here. For example, reduce it to 2
We have come to the conclusion that if the thickness is set to about 3 mm, no standing waves will occur.
本考案の目的は、コスト高をまぬがれない定在
波発生阻止のための緩衝材充填に代る確実で低コ
スト化可能な防音手段を提供するにあり、前記に
知見に基いて、エンジン本体を掩蔽する騒音防止
用カバーの外形により目的達成を図つた点に特徴
がある。 The purpose of the present invention is to provide a reliable and low-cost soundproofing means that can replace the filling of cushioning material to prevent the generation of standing waves, which inevitably increases the cost. It is distinctive in that the purpose was achieved by the external shape of the noise prevention cover.
以下、本考案の一実施例について図面を参照し
ながら説明する。第１図には本考案の実施例を縦
断正面図で示してある。 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the invention in a longitudinal sectional front view.
エンジン本体１を掩蔽する本考案騒音防止用カ
バー２は、例えばインジエクシヨンポンプ３、ス
タータ４等の付属機器類に２〜３mmの範囲の間隙
をへだてて、接触せず、これらの附属機器の形状
に可及的に沿つた凹凸外径の形状に形成してあ
る。必要に応じ充填材５を内部に収納し、シール
ラバー６により充填材を密封している。 The noise prevention cover 2 of the present invention, which covers the engine body 1, is provided with a gap of 2 to 3 mm to the auxiliary equipment, such as the injection pump 3 and the starter 4, without coming into contact with the auxiliary equipment. It is formed into a shape with an uneven outer diameter that follows the shape as much as possible. A filler 5 is housed inside as required, and the filler is sealed with a seal rubber 6.
本考案騒音防止用カバー２は鋼板のプレス成形
品であつてもよいし、合成樹脂成形品であつても
よい。 The noise prevention cover 2 of the present invention may be a press molded product of a steel plate or a synthetic resin molded product.
前記の構成からなる本考案騒音防止用カバー２
を実機に装着し、実験を行なつたところ、第２図
に示す線図の結果が得られた。 Noise prevention cover 2 of the present invention having the above configuration
When this was installed on an actual machine and an experiment was conducted, the results shown in the diagram shown in Figure 2 were obtained.
この線図は縦軸を騒音レベル（デジベル）と
し、横軸をエンジンスピードとしてあつて、線Ａ
で示す従来のカバーにおけるよりも線Ｂで示す如
く、全スピードにおいていずれも数デシベル以上
の騒音減少を立証している。 In this diagram, the vertical axis represents the noise level (decibels), the horizontal axis represents the engine speed, and line A
Both demonstrate a noise reduction of several decibels or more at all speeds, as shown by line B, compared to the conventional cover shown in FIG.
第３図はカバーと附属機器の間隙と騒音レベル
との関係を示すググラフであり、全負荷、
3000RPMの条件下で間隙が２〜３mmの範囲にお
いて騒音レベルが減少することを示している。 Figure 3 is a graph showing the relationship between the gap between the cover and attached equipment and the noise level.
It is shown that the noise level is reduced in the gap range of 2 to 3 mm under the condition of 3000 RPM.
以上の説明から明らかなように、本考案騒音防
止用カバーは緩衝材を充填することなく、定在波
の発生を阻止できて、低コストに大幅な騒音防止
効果をもたらすことができる優れた利点を有す
る。 As is clear from the above explanation, the noise prevention cover of the present invention has the excellent advantage of being able to prevent the generation of standing waves without being filled with cushioning material, and providing a significant noise prevention effect at a low cost. has.
第１図は本考案騒音防止用カバーの実施例を使
用状態で示した縦断正面図、第２図は従来の騒音
防止用カバーと本考案騒音防止用カバーを使用し
た場合の騒音レベルを示す線図、第３図はカバー
と附属機器の間隙と騒音レベルとの関係を示すグ
ラフである。
１……エンジン本体、２……騒音防止用カバ
ー、３……インジエクシヨンポンプ、４……スタ
ータ。
Figure 1 is a longitudinal sectional front view showing an embodiment of the noise prevention cover of the present invention in use, and Figure 2 is a line showing the noise level when using the conventional noise prevention cover and the noise prevention cover of the present invention. 3 are graphs showing the relationship between the gap between the cover and the attached equipment and the noise level. 1...Engine body, 2...Noise prevention cover, 3...Injection pump, 4...Starter.
Claims (1)
附属機器類に接触せず、定在波が発生しない２〜
３mmの範囲の間隙で附属機器形状に可及的に沿つ
た凹凸形状を形成したことを特徴とする内燃機関
の騒音防止用カバー。 Covers the engine body, does not come into contact with nearby auxiliary equipment, and does not generate standing waves 2-
A noise prevention cover for an internal combustion engine, characterized by forming an uneven shape that follows the shape of attached equipment as much as possible with a gap in the range of 3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16038783U JPS6066836U (en) | 1983-10-17 | 1983-10-17 | Noise prevention cover for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16038783U JPS6066836U (en) | 1983-10-17 | 1983-10-17 | Noise prevention cover for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6066836U JPS6066836U (en) | 1985-05-11 |
| JPH0217160Y2 true JPH0217160Y2 (en) | 1990-05-14 |
Family
ID=30352785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16038783U Granted JPS6066836U (en) | 1983-10-17 | 1983-10-17 | Noise prevention cover for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6066836U (en) |
-
1983
- 1983-10-17 JP JP16038783U patent/JPS6066836U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6066836U (en) | 1985-05-11 |
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