JPH05306653A - Engine oil pan - Google Patents
Engine oil panInfo
- Publication number
- JPH05306653A JPH05306653A JP11129092A JP11129092A JPH05306653A JP H05306653 A JPH05306653 A JP H05306653A JP 11129092 A JP11129092 A JP 11129092A JP 11129092 A JP11129092 A JP 11129092A JP H05306653 A JPH05306653 A JP H05306653A
- Authority
- JP
- Japan
- Prior art keywords
- oil pan
- inner box
- gap
- oil
- vibration
- 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.)
- Pending
Links
Landscapes
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明は主として自動車用に用
いられる小型エンジン用として好適なオイルパンの改良
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an oil pan suitable for a small engine mainly used for automobiles.
【0002】[0002]
【従来の技術】一般に上記エンジンのオイルパンは鋼板
をプレス成形して形成され、シリンダブロックの下面に
ボルト止めされている。そこで、一般に鋳造品が用いら
れるシリンダブロックに比して肉厚が薄い上に、密度が
高いため振動が伝わり易い傾向を持つ。すなわち、鋼板
製のオイルパンからはエンジン内部で発生した振動音が
透過し易いため透過音が高い。また、シリンダブロック
の振動が直接にオイルパンへ伝導され、オイルパン自体
が振動してそれ自体が騒音源となる、いわゆる放射音を
生じる。2. Description of the Related Art Generally, an engine oil pan is formed by pressing a steel plate and is bolted to the lower surface of a cylinder block. Therefore, compared with a cylinder block that is generally used as a cast product, the wall thickness is thin and the density is high, so that vibration tends to be transmitted easily. That is, since the vibration sound generated inside the engine is easily transmitted from the oil pan made of steel plate, the transmitted sound is high. Further, the vibration of the cylinder block is directly transmitted to the oil pan, and the oil pan itself vibrates to generate a so-called radiated sound which itself becomes a noise source.
【0003】そこで、従来はエンジン騒音がオインパン
から外部へ放散されることがないよう、オイルパンを内
外に二重構造にしたり、固有振動数の異なる材料を貼着
して構成した制振鋼板を用いたりすることが行われてい
る。殊に、前記二重構造にするものでは、図3で示すよ
うに、オイルパンAの外面にゴムなどの緩衝材Bでシリ
ンダブロックやオイルパンから浮かせた外箱Cを設ける
ものゝ他、内壁を設けるもの(例えば、実公昭56−2
2035号公報)が知られている。Therefore, in order to prevent engine noise from being radiated to the outside from the oil pan, a vibration damping steel plate having a double structure inside and outside or pasting materials having different natural frequencies has been conventionally used. It is used and used. Particularly, in the case of the double structure, as shown in FIG. 3, the outer wall of the oil pan A is provided with an outer box C floated from the cylinder block or the oil pan by a cushioning material B such as rubber. (For example, Jitsuko Sho 56-2)
No. 2035) is known.
【0004】[0004]
【発明が解決しようとする課題】しかしながら、前者、
すなわち、オイルパンの外側にさらに防音箱を被せる形
式のものでは、概して構造が複雑で外観が大きくなった
り、オイルパンと防音箱との間に水が入り易く腐食の原
因となることがあった。また、後者、すなわち、オイル
パンの内側に相似形の内壁を設けるものでは、内外が二
重壁となるため透過音に対しては効果があったが、内外
壁の間に油が自由に出入りできるため放射音については
ほとんど効果がなかった。[Problems to be Solved by the Invention] However, the former,
That is, in the type in which the soundproof box is further covered on the outside of the oil pan, the structure is generally complicated and the appearance is large, and water may easily enter between the oil pan and the soundproof box, which may cause corrosion. .. The latter, that is, the one with a similar inner wall inside the oil pan, was effective for transmitted sound because the inner and outer walls were double walls, but oil could freely enter and leave between the inner and outer walls. Because it was possible, it had almost no effect on radiated sound.
【0005】この発明は上記問題点に鑑みて、鋼板製の
オイルパンの内側に内箱を設けて内外二重壁として透過
音の減少を図ると同時に、シリンダブロックから伝えら
れる振動によってオイルパンが振動して生じる放射音の
放散を可及的に低減することを目的とするものである。In view of the above problems, the present invention provides an inner box inside a steel plate oil pan to reduce the transmitted sound as an inner and outer double wall, and at the same time, the oil pan is vibrated by the vibration transmitted from the cylinder block. The purpose is to reduce radiation noise generated by vibration as much as possible.
【0006】[0006]
【課題を解決するための手段】上記問題点を解決するた
めの本発明のエンジンのオイルパンは、オイルパンとそ
の内面に取付けられる内箱とからなり、その内箱の外面
形状をオイルパンの内面形状と略相似形に形成して、内
箱とオイルパンの内面との間に僅少な間隙を形成し、そ
の間隙に緩衝材を介在させると共に、その隙間に面した
内箱の上部に息抜孔と下部に通油孔とを設けて内箱の内
部の潤滑油を隙間の中へ導くように構成したものであ
る。An engine oil pan according to the present invention for solving the above problems comprises an oil pan and an inner box attached to the inner surface of the oil pan. Formed in a shape similar to the inner surface shape, a small gap is formed between the inner box and the inner surface of the oil pan, a cushioning material is interposed in the gap, and the upper part of the inner box facing the gap is breathed. The vent hole and the oil passage hole are provided in the lower part to guide the lubricating oil inside the inner box into the gap.
【0007】[0007]
【作 用】オイルパンの内面には、それと略相似形の外
面を持つ内箱を取り付けたから、両者の間には僅少な隙
間ができる。その隙間には内箱に設けた通油孔から内部
の潤滑油が入り、隙間の空気は上部の息抜孔から内箱内
へ逃げる。隙間の中における潤滑油の液面は隙間が小さ
いため表面張力によって内箱の内部より高くなる。エン
ジン内部で生じた騒音やシリンダブロックの振動によっ
てオイルパンを構成する鋼板が加振されると、必然的に
隙間の大きさを変化させようとして隙間の中にある潤滑
油を移動させる。しかしながら、前記隙間が比較的小さ
いため、隙間内を充填した潤滑油が迅速に移動できない
上に、その移動によって潤滑油と壁面との間の流動抵抗
により騒音エネルギーが消費され、オイルパンの外面を
なす広い面の振動が制止される。[Operation] The inner box of the oil pan has an outer surface that is similar to the inner box, so there is a slight gap between them. Lubricating oil inside enters into the gap through oil passage holes provided in the inner box, and air in the gap escapes into the inner box through the breather hole in the upper portion. The liquid level of the lubricating oil in the gap is higher than that in the inner box due to the surface tension because the gap is small. When the steel plate forming the oil pan is vibrated by noise generated inside the engine or vibration of the cylinder block, the lubricating oil inevitably moves in an attempt to change the size of the gap. However, since the gap is relatively small, the lubricating oil filled in the gap cannot move quickly, and the movement consumes noise energy due to the flow resistance between the lubricating oil and the wall surface. Vibration of a wide surface is stopped.
【0008】[0008]
【実 施 例】以下、図示の実施例によってこの発明を
説明する。図1中、1は鋼板をプレス成形し、防錆塗装
を施した、いわゆる鋼板製のオイルパンである。オイル
パン1の底部1aは一側が浅く、他側が深く構成され、
その深い部分に図示してないオイルポンプの吸入口が開
口する。1bはシリンダブロック2へ取付けるためのフ
ランジ面、1cはボルト孔である。[Examples] The present invention will be described below with reference to illustrated examples. In FIG. 1, reference numeral 1 denotes a so-called steel plate oil pan in which a steel plate is press-molded and anticorrosive coating is applied. The bottom portion 1a of the oil pan 1 is configured such that one side is shallow and the other side is deep,
A suction port of an oil pump (not shown) opens in the deep portion. 1b is a flange surface for attaching to the cylinder block 2, and 1c is a bolt hole.
【0009】この発明においては、オイルパン1の内面
には、その内面と略相似形の外面を持つ、同じく鋼板製
の内箱3が取付けられている。図2で示すように、オイ
ルパン1と内箱3とはゴム状の緩衝部材4を挟んでスペ
ーサ4aとボルト4bとを介してシリンダブロック2の
下面にボルト止めされている。よって、オイルパン1と
内箱3との間には狭い間隙5が形成される。In the present invention, an inner box 3 made of the same steel plate is attached to the inner surface of the oil pan 1 and has an outer surface having a shape similar to that of the inner surface. As shown in FIG. 2, the oil pan 1 and the inner box 3 are bolted to the lower surface of the cylinder block 2 via a spacer 4a and bolts 4b with a rubber-like cushioning member 4 interposed therebetween. Therefore, a narrow gap 5 is formed between the oil pan 1 and the inner box 3.
【0010】オイルパン1の内面と内箱3の外面との間
隙5は騒音低減効果の点で、できるだけ狭くするのがよ
く、0.5〜1mm程度とするのが好ましい。その間隙
5の中には緩衝材5aとして、数箇所にゴムやゴム状の
合成樹脂が貼着してあり、製作誤差によってオイルパン
1と内箱3が部分的に金属同士で接触してびゞり音を発
生しないように配慮してある。The gap 5 between the inner surface of the oil pan 1 and the outer surface of the inner box 3 is preferably as narrow as possible in terms of noise reduction effect, and is preferably about 0.5 to 1 mm. Rubber or rubber-like synthetic resin is adhered to several places in the gap 5 as a cushioning material 5a. Due to a manufacturing error, the oil pan 1 and the inner box 3 may partially contact each other with metal. Care is taken not to generate a clicking noise.
【0011】この隙間5と内箱3の内面とは内箱3の上
部に設けた息抜孔3aと下部に設けた通油孔3bとで連
通してある。よって、オイルパン1へ給油すると、潤滑
油は内箱3へ入り、次いで隙間5の内にあった空気を息
抜孔3aから内箱3内へ排除しつゝ、下側の通油孔3b
から隙間5内へ流入する。なお、前記息抜孔3aと通油
孔3bの大きさは音が洩れるのを防ぐため、できるだけ
小さく設定するのが好ましい。この実施例において、下
側の通油孔3bはドレインボルト3cの直上に設けられ
ており、潤滑油の交換の際にこの通油孔3bが大きくな
くても、潤滑油の排出が迅速に行われるようにしてあ
る。1dは補強板でオイルパン1の底面に溶着してあ
り、ドレインボルト3cが螺合するボルト孔が設けてあ
る。The gap 5 and the inner surface of the inner case 3 are communicated with each other by a breather hole 3a provided in the upper part of the inner case 3 and an oil passage 3b provided in the lower part. Therefore, when oil is supplied to the oil pan 1, the lubricating oil enters the inner box 3, and then the air present in the gap 5 is removed from the breather hole 3a into the inner box 3 while the lower oil passage 3b is provided.
Flows into the gap 5. The sizes of the breather hole 3a and the oil passage hole 3b are preferably set as small as possible in order to prevent sound from leaking. In this embodiment, the lower oil passage 3b is provided directly above the drain bolt 3c, so that when the lubricating oil is replaced, the lubricating oil can be quickly discharged even if the oil passage 3b is not large. I'm supposed to be. A reinforcing plate 1d is welded to the bottom surface of the oil pan 1 and has a bolt hole into which the drain bolt 3c is screwed.
【0012】この発明に係るオイルパン1は以上のよう
に構成されているから、エンジンの運転中に燃焼音やピ
ストンやクランク軸の打音などエンジンの内部で発生す
る音は内箱3の内面に音圧として作用し、それを振動さ
せようとするが、内箱3の表面が僅かでも動くと、オイ
ルパン1と内箱3の間の間隙5を充たしている潤滑油が
移動する。そのため、潤滑油と壁面との粘着摩擦で騒音
のエネルギーに減衰が生じるので、内部音がオイルパン
1を透過せず、騒音の放出が低減する。Since the oil pan 1 according to the present invention is constructed as described above, the sound generated inside the engine, such as the combustion sound and the sound of the piston or the crankshaft while the engine is operating, is not used for the inner surface of the inner box 3. However, if the surface of the inner box 3 moves even slightly, the lubricating oil filling the gap 5 between the oil pan 1 and the inner box 3 moves. Therefore, the energy of noise is attenuated by the adhesive friction between the lubricating oil and the wall surface, so that the internal sound does not pass through the oil pan 1 and the noise emission is reduced.
【0013】同様に、エンジンの燃焼振動や動弁系の振
動のようにシリンダブロック2を通じてオイルパン1へ
振動が伝えられると、オイルパン1と内箱3とは固有振
動数が相違するため、異なる位相や周期で振動しようと
するので、前記間隙5が大小に変化し、その変化に追従
するべく移動する潤滑油と壁面との粘着摩擦で騒音エネ
ルギーに減衰が生じ、その結果、放散される騒音が低減
する。Similarly, when the vibration is transmitted to the oil pan 1 through the cylinder block 2 like the combustion vibration of the engine or the vibration of the valve train, the natural frequency of the oil pan 1 is different from that of the inner box 3. Since the gap 5 changes in size and magnitude because it tries to vibrate in different phases and periods, the noise energy is attenuated by the adhesive friction between the lubricating oil and the wall surface that move to follow the change, and as a result, it is dissipated. Noise is reduced.
【0014】[0014]
【発明の効果】この発明は以上のように、オイルパン1
の内面と内箱3の外面との間に僅少な間隙5を設け、そ
の間隙5に潤滑油を満たすと共に、オイルパン1、ある
いは内箱3のいずれかがエンジンの内部音や振動によっ
て共振しようとするとき、間隙5に介在させた潤滑油の
粘性でそれを減衰させようとするもので、その騒音低減
効果が顕著であり、且つ、構造が単純で使用による消耗
もなく長期に亘ってその効果を維持できる実用上の効果
が大きいものである。As described above, according to the present invention, the oil pan 1
A small gap 5 is provided between the inner surface of the inner casing 3 and the outer surface of the inner casing 3, and the gap 5 is filled with lubricating oil, and either the oil pan 1 or the inner casing 3 will resonate due to internal sound or vibration of the engine. In this case, the viscosity of the lubricating oil intervening in the gap 5 is used to damp it, and its noise reduction effect is remarkable, and the structure is simple and there is no wear and tear for a long time. This is a great practical effect that can maintain the effect.
【図1】この発明に係るオイルパン1の斜視図である。FIG. 1 is a perspective view of an oil pan 1 according to the present invention.
【図2】エンジンのオイルパン部分の断面図である。FIG. 2 is a sectional view of an oil pan portion of the engine.
【図3】従来例を示す図2相当の断面図である。FIG. 3 is a sectional view corresponding to FIG. 2 showing a conventional example.
1 オイルパン 2 シリンダブ
ロック 3 内箱 3a 息抜孔 3b 通油孔 4 緩衝部材 5 狭い間隙1 oil pan 2 cylinder block 3 inner box 3a breather hole 3b oil passage hole 4 cushioning member 5 narrow gap
Claims (1)
箱とからなり、その内箱の外面形状をオイルパンの内面
形状と略相似形に形成して、内箱とオイルパンの内面と
の間に僅少な間隙を形成し、その間隙に緩衝材を介在さ
せると共に、その隙間に面した内箱の上部に息抜孔と下
部に通油孔とを設けて内箱の内部の潤滑油を隙間の中へ
導くように構成したエンジンのオイルパン。1. An oil pan and an inner box attached to the inner surface of the oil pan, wherein the outer surface of the inner box is formed in a shape substantially similar to the inner surface of the oil pan, and between the inner box and the inner surface of the oil pan. A small gap is formed in the inner space, a cushioning material is interposed in the gap, and a breather hole and an oil passage hole are formed in the upper part of the inner box facing the gap and the lubricating oil inside the inner box is filled in the gap. An oil pan for the engine that is configured to lead inside.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11129092A JPH05306653A (en) | 1992-04-30 | 1992-04-30 | Engine oil pan |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11129092A JPH05306653A (en) | 1992-04-30 | 1992-04-30 | Engine oil pan |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05306653A true JPH05306653A (en) | 1993-11-19 |
Family
ID=14557477
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11129092A Pending JPH05306653A (en) | 1992-04-30 | 1992-04-30 | Engine oil pan |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH05306653A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7481196B2 (en) | 2005-06-09 | 2009-01-27 | Mann & Hummel Gmbh | Oil pan useful for an internal combustion engine |
KR20190083083A (en) * | 2018-01-03 | 2019-07-11 | 두산인프라코어 주식회사 | Oil pan assembly for engine |
-
1992
- 1992-04-30 JP JP11129092A patent/JPH05306653A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7481196B2 (en) | 2005-06-09 | 2009-01-27 | Mann & Hummel Gmbh | Oil pan useful for an internal combustion engine |
KR20190083083A (en) * | 2018-01-03 | 2019-07-11 | 두산인프라코어 주식회사 | Oil pan assembly for engine |
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