JPH1150830A - Gas-liquid separation chamber - Google Patents

Gas-liquid separation chamber

Info

Publication number
JPH1150830A
JPH1150830A JP20875597A JP20875597A JPH1150830A JP H1150830 A JPH1150830 A JP H1150830A JP 20875597 A JP20875597 A JP 20875597A JP 20875597 A JP20875597 A JP 20875597A JP H1150830 A JPH1150830 A JP H1150830A
Authority
JP
Japan
Prior art keywords
gas
oil
liquid
hole
separation chamber
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
Application number
JP20875597A
Other languages
Japanese (ja)
Other versions
JP3904297B2 (en
Inventor
Koji Satake
浩二 佐竹
Toshihito Kasai
聡人 笠井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP20875597A priority Critical patent/JP3904297B2/en
Publication of JPH1150830A publication Critical patent/JPH1150830A/en
Application granted granted Critical
Publication of JP3904297B2 publication Critical patent/JP3904297B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a gas-liquid separation chamber having an oil returning passage for preventing the return of separated oil into blowby gas again. SOLUTION: A liquid accumulating cavity 20, having an opened upper surface, is provided on the vicinity of the lowermost bottom part of the engine side surface of a partitioning wall 17; having a gas passing hole 19 and a liquid passing hole 21 having an area smaller than that of the gas passing hole, and being provided so as to separate between engine and air sides; and the liquid passing hole is to be provided on the inner side of the liquid accumulating cavity. Consequently, an oil returning hole can be submerged in oil constantly, thereby inhibiting the exposure of the returning hole to a blowby gas flow to eliminate splashing the oil into the blowby gas.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、気液分離室に関
し、特にブローバイガス中の油分を分離するための気液
分離室に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-liquid separation chamber, and more particularly to a gas-liquid separation chamber for separating oil from blow-by gas.

【0002】[0002]

【従来の技術】4サイクルエンジンは、クランクケース
内圧の負圧傾向を維持するために、吸入・爆発行程での
ピストン運動で上昇するクランクケース内圧を逃がすよ
うにしている。この際、クランクケース内から流出する
ブローバイガス中にはミスト化したエンジンオイルが含
まれているので、吸気経路の適所に(多くはエアクリー
ナケースのクリーンサイド)、つまり混合気中にブロー
バイガスを還流させることにより、オイルミストが大気
中に放出されることを避けるようにしている。
2. Description of the Related Art In a four-stroke engine, in order to maintain a negative tendency of the internal pressure of the crankcase, the internal pressure of the crankcase, which rises due to the movement of the piston during a suction / explosion stroke, is released. At this time, since the blow-by gas flowing out of the crankcase contains mist engine oil, the blow-by gas is recirculated to an appropriate position in the intake path (mostly the clean side of the air cleaner case), that is, to the air-fuel mixture. By doing so, the oil mist is prevented from being released into the atmosphere.

【0003】一方、吸気中に混入した油分は、吸気管路
や燃料供給系路に付着したり、燃焼室回りにカーボンを
堆積させたりして、性能低下を誘発する要因となるの
で、極力除去されることが望まれる。そのため、ブロー
バイガスの吸気管路への流出口には、気液分離室が設け
られることが一般的である。
On the other hand, oil mixed in the intake air adheres to an intake pipe or a fuel supply system or deposits carbon around a combustion chamber, thereby causing performance deterioration. It is desired to be done. Therefore, a gas-liquid separation chamber is generally provided at the outlet of the blow-by gas to the intake pipe.

【0004】さて、気液分離室で分離されたオイルは、
速やかにオイルパンに戻されることが望ましいが、従
来、ブローバイガスの流入口の面積に比して十分に小さ
いオイル戻し孔を気液分離室の隔壁に設け、この戻し孔
を通してオイルの自重及びクランクケース内の負圧によ
ってオイルパンにオイルを戻すようにしている。
[0004] The oil separated in the gas-liquid separation chamber is
It is desirable that the oil is quickly returned to the oil pan. Conventionally, however, an oil return hole that is sufficiently smaller than the area of the blow-by gas inflow port is provided in the partition of the gas-liquid separation chamber. The oil is returned to the oil pan by the negative pressure in the case.

【0005】[0005]

【発明が解決しようとする課題】しかるに、上記のオイ
ル戻し孔は、面積が小さいとは言ってもブローバイガス
も通過し得るので、分離されたオイルの一部がブローバ
イガス流によって吹き飛ばされることを防止できない。
そのため、折角分離されたオイルが再びブローバイガス
中に戻ってしまうことが起こり得た。
However, since the above-mentioned oil return hole can pass blow-by gas even though its area is small, it is necessary to prevent a part of the separated oil from being blown off by the blow-by gas flow. It cannot be prevented.
For this reason, the separated oil may return to the blow-by gas again.

【0006】本発明は、このような問題点を解消するべ
くなされたものであり、その主な目的は、分離されたオ
イルが再びブローバイガス中に戻ってしまうことを防止
することができる油戻し通路を有する気液分離室を提供
することにある。
The present invention has been made to solve such a problem, and a main object of the present invention is to provide an oil return that can prevent separated oil from returning to the blow-by gas again. It is to provide a gas-liquid separation chamber having a passage.

【0007】[0007]

【課題を解決するための手段】このような目的を果たす
ために、本発明の気液分離室においては、気体通過孔
と、該気体通過孔より小さな面積の液体通過孔とを有
し、エンジン側と大気側とを隔てるように設けられた隔
壁のエンジン側の面の最下底部近傍に、上面が開放され
た液溜め窪みを設け、該液溜め窪みの内側に液体通過孔
を設けるものとした。これにより、オイルの戻し孔は常
にオイル中に没入することとなるので、戻し孔がブロー
バイガス流に曝されなくなり、オイルがブローバイガス
中に吹き飛ばされることが無くなる。
In order to achieve such an object, a gas-liquid separation chamber according to the present invention has a gas passage hole and a liquid passage hole having a smaller area than the gas passage hole, and is provided with an engine. A liquid reservoir recess having an open top surface, and a liquid passage hole provided inside the liquid reservoir recess, near the bottom bottom of the engine-side surface of the partition wall provided so as to separate the fuel tank from the atmosphere. did. As a result, the oil return hole is always immersed in the oil, so that the return hole is not exposed to the blow-by gas flow, and the oil is not blown into the blow-by gas.

【0008】[0008]

【発明の実施の形態】以下に添付の図面に示された実施
例を参照して本発明の構成について詳細に説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described below in detail with reference to embodiments shown in the accompanying drawings.

【0009】図1は、本発明が適用される4サイクル単
気筒エンジンを示している。このエンジン1は、クラン
ク軸2を垂直配置した所謂バーチカルクランク軸型エン
ジンであり、シリンダブロック3の図における左端にシ
リンダヘッド4が、右端にクランクケース5がそれぞれ
結合され、スタータモータ6がクランクケース5に隣接
して配設され、クランク軸2の下端側にオイルパン7が
結合され、そしてスタータモータ6のピニオン8に噛み
合うリングギヤ9を有するフライホイール10がクラン
ク軸2の上端に固着されている。
FIG. 1 shows a four-cycle single-cylinder engine to which the present invention is applied. This engine 1 is a so-called vertical crankshaft engine in which a crankshaft 2 is vertically arranged. A cylinder head 4 is coupled to a left end of the cylinder block 3 in the drawing, and a crankcase 5 is coupled to a right end, and a starter motor 6 is connected to the crankcase. 5, an oil pan 7 is connected to the lower end of the crankshaft 2, and a flywheel 10 having a ring gear 9 that meshes with a pinion 8 of the starter motor 6 is fixed to the upper end of the crankshaft 2. .

【0010】シリンダヘッド4には、動弁機構11が設
けられ、動弁機構11はヘッドカバー12で覆われてい
る。
A valve mechanism 11 is provided on the cylinder head 4, and the valve mechanism 11 is covered with a head cover 12.

【0011】クランクケース5内とヘッドカバー12内
とは、シリンダブロック3に形成された通路(図示せ
ず)を介して互いに連通している。
The inside of the crankcase 5 and the inside of the head cover 12 communicate with each other via a passage (not shown) formed in the cylinder block 3.

【0012】ヘッドカバー12には、上向きにホース口
13が突設されており、ヘッドカバー12内は、エアク
リーナとスロットル弁との間の吸気通路(図示せず)に
ゴムホース14を介して連通している。
A hose port 13 projects upward from the head cover 12, and the inside of the head cover 12 communicates with an intake passage (not shown) between the air cleaner and the throttle valve via a rubber hose 14. .

【0013】ヘッドカバー12の内側は、吸気通路に連
通するブリーザ室15と、クランクケース5に連通する
動弁機構室16とに隔壁17で隔てられている。この隔
壁17には、図2に示すように、クランクケース内圧が
高まると押しのけられるリード弁18で塞がれた通気孔
19が設けられている。
The inside of the head cover 12 is separated by a partition 17 from a breather chamber 15 communicating with the intake passage and a valve mechanism chamber 16 communicating with the crankcase 5. As shown in FIG. 2, the partition wall 17 is provided with a vent hole 19 closed by a reed valve 18 which is pushed away when the internal pressure of the crankcase increases.

【0014】隔壁17におけるヘッドカバー12の最下
底部に対応する位置には、動弁機構室16側に突出し、
かつ上面が開放した液溜め窪み20が設けられている。
そしてこの窪み20の内側に、オイルが通過する油戻し
孔21が設けられている。この油戻し孔21は、ブロー
バイガスが通過する通気孔19に比して十分に小さい面
積にされている。
At a position corresponding to the lowermost bottom portion of the head cover 12 in the partition wall 17, it projects toward the valve mechanism chamber 16;
In addition, a liquid reservoir recess 20 having an open upper surface is provided.
An oil return hole 21 through which oil passes is provided inside the depression 20. The oil return hole 21 has an area sufficiently smaller than the vent hole 19 through which the blow-by gas passes.

【0015】ブローバイガスは、動弁機構室16から通
気孔19を通過してブリーザ室15に入る。ここでブリ
ーザ室15の容積でブローバイガスの流速が急激に低下
するので、慣性質量の差によってブローバイガス中のオ
イルミストが大粒子化し、ブリーザ室15の内壁に付着
する。分離したオイルは、ヘッドカバー12の最下底部
に溜まり、油戻し孔21を経て動弁機構室16側の液溜
め窪み20内に流入し、窪み20の上面開口からオーバ
ーフローして動弁機構室16内に自然落下し、かつクラ
ンクケース5内の負圧に引かれてオイルパン7へと戻
る。
The blow-by gas enters the breather chamber 15 from the valve mechanism chamber 16 through the vent hole 19. Here, since the flow velocity of the blow-by gas rapidly decreases due to the volume of the breather chamber 15, oil mist in the blow-by gas becomes large particles due to the difference in inertial mass and adheres to the inner wall of the breather chamber 15. The separated oil accumulates in the lowermost bottom portion of the head cover 12, flows through the oil return hole 21 into the liquid reservoir recess 20 on the valve mechanism chamber 16 side, overflows from the upper opening of the recess 20, and overflows. And falls back to the oil pan 7 due to the negative pressure in the crankcase 5.

【0016】[0016]

【発明の効果】このように本発明によれば、油戻し通路
が常時オイル中に没入しているので、ブローバイガスで
吹き上げられることが無く、一旦分離したオイルが再び
ガス中に飛散するおそれが無くなる。従って、吸気中に
流入するブローバイガス中の油分を飛躍的に減少させる
ことができるので、長期間にわたって安定した性能を維
持する上に大きな効果が得られる。
As described above, according to the present invention, since the oil return passage is always immersed in the oil, it is not blown up by the blow-by gas, and the oil once separated may be scattered again in the gas. Disappears. Therefore, the oil content in the blow-by gas flowing into the intake air can be drastically reduced, so that a great effect can be obtained in maintaining stable performance over a long period of time.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明が適用されたバーチカルクランク軸型エ
ンジンの断面図。
FIG. 1 is a sectional view of a vertical crankshaft engine to which the present invention is applied.

【図2】ヘッドカバーの図1中のII−II線矢視図。FIG. 2 is a view of the head cover taken along line II-II in FIG. 1;

【図3】図2中のIII−III線に沿う断面図。FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

【符号の説明】[Explanation of symbols]

1 エンジン 2 クランク軸 3 シリンダブロック 4 シリンダヘッド 5 クランクケース 6 スタータモータ 7 オイルパン 8 ピニオン 9 リングギア 10 フライホイール 11 動弁機構 12 ヘッドカバー 13 ホース口 14 ゴムホース 15 ブリーザ室 16 動弁機構室 17 隔壁 18 リード弁 19 通気孔 20 液溜め窪み 21 油戻し孔 DESCRIPTION OF SYMBOLS 1 Engine 2 Crankshaft 3 Cylinder block 4 Cylinder head 5 Crankcase 6 Starter motor 7 Oil pan 8 Pinion 9 Ring gear 10 Flywheel 11 Valve train mechanism 12 Head cover 13 Hose port 14 Rubber hose 15 Breather chamber 16 Valve train mechanism room 17 Partition wall 18 Reed valve 19 Vent hole 20 Reservoir dent 21 Oil return hole

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 気体通過孔と、該気体通過孔より小さな
面積の液体通過孔とが設けられた隔壁でエンジン側と大
気側とを隔ててなる気液分離室であって、 前記隔壁のエンジン側の面の最下底部近傍に、上面が開
放された液溜め窪みを設け、該液溜め窪みの内側に前記
液体通過孔を設けたことを特徴とする気液分離室。
1. A gas-liquid separation chamber which is provided with a gas passage hole and a liquid passage hole having a smaller area than the gas passage hole and separates an engine side and an atmosphere side from each other. A liquid reservoir dent having an open upper surface near the lowermost bottom of the side surface, and the liquid passage hole provided inside the liquid reservoir dent.
JP20875597A 1997-08-04 1997-08-04 Gas-liquid separation chamber Expired - Fee Related JP3904297B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20875597A JP3904297B2 (en) 1997-08-04 1997-08-04 Gas-liquid separation chamber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20875597A JP3904297B2 (en) 1997-08-04 1997-08-04 Gas-liquid separation chamber

Publications (2)

Publication Number Publication Date
JPH1150830A true JPH1150830A (en) 1999-02-23
JP3904297B2 JP3904297B2 (en) 2007-04-11

Family

ID=16561552

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20875597A Expired - Fee Related JP3904297B2 (en) 1997-08-04 1997-08-04 Gas-liquid separation chamber

Country Status (1)

Country Link
JP (1) JP3904297B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013151905A (en) * 2012-01-25 2013-08-08 Toyota Motor Corp Oil separator of blowby gas processing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013151905A (en) * 2012-01-25 2013-08-08 Toyota Motor Corp Oil separator of blowby gas processing device

Also Published As

Publication number Publication date
JP3904297B2 (en) 2007-04-11

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