WO2014080656A1 - Oil separator - Google Patents

Oil separator Download PDF

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Publication number
WO2014080656A1
WO2014080656A1 PCT/JP2013/065908 JP2013065908W WO2014080656A1 WO 2014080656 A1 WO2014080656 A1 WO 2014080656A1 JP 2013065908 W JP2013065908 W JP 2013065908W WO 2014080656 A1 WO2014080656 A1 WO 2014080656A1
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Prior art keywords
plate
oil separator
oil
notch
cylinder head
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PCT/JP2013/065908
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French (fr)
Japanese (ja)
Inventor
山崎　伸司
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三桜工業 株式会社
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Publication of WO2014080656A1 publication Critical patent/WO2014080656A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • F01M13/0405—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil arranged in covering members apertures, e.g. caps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • F01M2013/0461—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil with a labyrinth

Definitions

  • the present invention relates to an engine oil separator. More specifically, the present invention relates to a baffle type oil separator.
  • blow-by gas that has flowed into a crankcase is guided to a cylinder head cover, and is returned from the cylinder head cover to a downstream side of a throttle valve in an intake pipe.
  • an oil separator is interposed in the blow-by gas recirculation system, the oil is removed by the oil separator, and the air is recirculated to the intake pipe.
  • a baffle plate type oil that separates oil by forming a separator chamber in a cylinder head cover, erecting a baffle plate in the chamber, and causing blow-by gas passing through the chamber to collide with the baffle plate
  • a separator for example, Patent Documents 1 and 2.
  • the baffle plate type oil separator as described above has a configuration shown in FIG. 6 particularly in a small cylinder engine such as a motorcycle. That is, the synthetic resin cylinder head cover 51 configured to cover the cylinder head from the side is formed with a concave portion 52 that opens to the side as shown in FIG. 6, and the baffle plate 53 is erected in the concave portion 52. As shown in FIG. 6B, there is a baffle plate type oil separator 50 that covers a recess opening and covers a synthetic resin plate 54 to define a separator chamber 55. In such an oil separator 50, as shown in FIG. 6A, the plate 54 is fixed to the periphery of the opening of the recess 52 with screws 56 or the like.
  • an object of the present invention is to provide an oil separator that prevents oil from entering the separator chamber as much as possible.
  • the present invention provides the following oil separators [1] to [3].
  • An oil separator in which a recess is formed in the cylinder head cover and a baffle plate is erected inside, and a plate is placed over the opening of the recess to define a separator chamber, and a notch is provided around the opening periphery of the recess.
  • An oil separator wherein the plate is attached to the notch.
  • the plate is mounted on the notch formed in the opening of the recess defining the separator chamber of the oil separator, so that the labyrinth is formed by the wall surface of the notch and the peripheral surface of the plate. Even if a seal is formed and the plate is deformed to form a gap between the cylinder head cover and the plate, the oil can be prevented from flowing into the separation chamber. Further, the plate can be joined to the cylinder head cover, for example, by point joining, and simplification of the manufacturing process can be expected. Further, according to the oil separator [2] described above, since the plate is buried in the notch, the improvement of the sealing effect can be further expected. Furthermore, according to the above oil separator [3], deformation such as warpage of the plate can be prevented as much as possible.
  • FIG. 1 is a view showing an engine equipped with an oil separator according to the present invention.
  • FIG. 2 is a conceptual external view of a cylinder head cover provided with an oil separator according to the present invention.
  • 3 is a view showing the inside of the cylinder head cover of FIG. 2, wherein (a) is a longitudinal sectional perspective view of a portion along line AA in FIG. 2, and (b) is in FIG. It is an enlarged view of a circle part.
  • 4 is a cross-sectional view of a portion along the line BB in FIG. 5A and 5B are perspective views showing the plate, in which FIG. 5A shows the front side (separator chamber side), and FIG. 5B shows the back side. 6A and 6B show a state where the plate is attached to a conventional oil separator.
  • FIG. 6A is a bottom view as viewed from the cylinder head side
  • FIG. 6B is a portion along line CC in FIG.
  • the oil separator according to the present invention will be described in detail based on the embodiments shown in the drawings.
  • the axial center of the cylinder 2 is installed substantially horizontally, and the cylinder head cover 3 is covered from the side on the cylinder head.
  • the oil separator 10 is installed on the cylinder head cover 3.
  • the ceiling of the cylinder head cover 3 bulges outward, and inside the bulging portion 11 as shown in FIG.
  • a recess 12 is formed that opens to the side (the side in FIG. 3).
  • three baffle plates 13 13a, 13b, 13c are erected on the ceiling wall 11a.
  • the central baffle plate 13b of the baffle plates 13 extends from one side wall 11b toward the opposite side wall 11c, and the tip thereof is positioned with an appropriate gap a from the other side wall 11c.
  • the baffle plates 13a and 13c arranged so as to sandwich the baffle plate 13b extend from the other side wall 11c toward the one side wall 11b facing each other, and the tip thereof is positioned with an appropriate gap a from the one side wall 11b.
  • These baffle plates 13a, 13b, and 13c are arranged such that their tips are inclined downward.
  • an exhaust port 14 is provided in the other side wall 11d defining the recess 12 (upper side wall in FIG.
  • the opening of the recess 12 is closed by a plate 15 as shown in FIG.
  • the plate 15 has notches (blow-by gas inlets) 15a at some corners, and ribs 15b are erected on the back periphery.
  • the ribs 15b are advantageous in terms of strength as long as they are formed on the entire periphery of the plate 15.
  • the ribs 15b may not necessarily be the entire periphery, and may be formed intermittently. Further, when the plate 15 is attached substantially vertically, the rib 15b may be formed only on the peripheral edge of the upper portion.
  • a notch 16 is provided around the periphery of the opening of the recess 12. Then, as shown in FIG. 3 (a), the plate 15 is installed so as to be fitted into the notch 16, and is attached to the opening peripheral edge of the recess 12 by appropriate means such as heat caulking or spot welding, A separator chamber 17 in which blow-by gas flows from below to above is defined. A labyrinth seal 18 is formed between the plate 15 attached in this way and the wall surface of the notch 16 as shown in FIG.
  • the depth W1 of the notch 16 formed in the recess 12 is larger (deeper) than the plate thickness (including the height of the rib 15b when the rib 15b is formed) W2, The sealing effect can be further enhanced.
  • the sealing effect can be further enhanced.
  • the cylinder head cover 3 is covered from the side as described above. Will be. Then, the opening of the recess 12 formed in the cylinder head cover 3 faces sideways, and the plate 15 that closes the recess 12 opening to the side is fitted into the notch 16 almost vertically.
  • the notch 16 acts as an eaves and can effectively prevent the oil dripping from above from entering the gap between the notch 16 and the plate 15, and the sealing effect becomes more prominent.
  • the inner dimension of the notch 16 is substantially the same as the outer dimension of the plate 15 and the plate 15 is fitted into the notch 16 and further fitted by press fitting, the notch with the plate 15 There is no gap for oil to enter between the side walls of 16 and the frictional resistance with the side walls of the notch 16 makes it difficult for deformation such as warpage of the plate 15 to occur, and a higher sealing effect.
  • the blow-by gas in the cylinder head cover 3 is guided to the separator chamber 17 through the blow-by gas inlet 15a of the plate 15 as shown in FIG.
  • the gas is discharged from the exhaust port 14 through a passage defined by the baffle plates 13a, 13b, and 13c.
  • the blow-by gas collides with the baffle plate 13, the course is changed along the baffle plate 13, and the oil in the blow-by gas is separated.
  • the separated oil flows down and returns to the cylinder head cover 3 from the blow-by gas inlet 15a as indicated by the solid arrow.
  • blow-by gas from which the oil has been separated through the passage defined by the baffle plates 13a, 13b, and 13c is returned to the intake pipe 5.
  • the oil separator of the above embodiment shows a case where it is configured in a small cylinder engine mounted on the vehicle body so that the cylinder axis is substantially horizontal, but the present invention has a separator chamber, As long as it is formed by a recess formed in the cylinder head cover and a plate that closes the opening of the recess, the mounting posture of the engine is not limited.
  • the oil separator According to the oil separator according to the present invention, it is possible to prevent inconvenient inflow of oil into the separation chamber and to expect simplification of the manufacturing process. Therefore, the oil separator is installed in the blow-by gas recirculation system of the automobile engine. As an oil separator to be used, it can be suitably used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

Provided is an oil separator that prevents the infiltration of oil into a separator chamber as much as possible. In this oil separator a recess part (12) is formed in a cylinder head cover (3), baffle plates (13) are erected therein, and the recess part is covered with a plate (15), thereby defining a separator chamber (17). This oil separator is characterized in that notches (16) are provided at the edge of the opening of the recess part, and the plate (15) is mounted in these notches.

Description

オイルセパレータOil separator
　本発明は、エンジンのオイルセパレータに関するものである。さらに詳しくは、邪魔板式オイルセパレータに関するものである。 The present invention relates to an engine oil separator. More specifically, the present invention relates to a baffle type oil separator.
　例えば、自動車のエンジンでは、クランクケース内に流出したブローバイガスを、シリンダヘッドカバーへ導き、該シリンダヘッドカバーから吸気管におけるスロットルバルブの下流へ還流させている。
　ところで、ブローバイガスには、オイルが混入しているため、ブローバイガス還流系にオイルセパレータを介在させ、該オイルセパレータでオイルを除去して空気を吸気管へ還流させることがなされている。
　このようなオイルセパレータとして、シリンダヘッドカバー内にセパレータ室を形成し、その室内に邪魔板を立設し、室内を通過するブローバイガスをその邪魔板に衝突させることによって、オイルを分離させる邪魔板式オイルセパレータがある（例えば、特許文献１、２）。 For example, in an automobile engine, blow-by gas that has flowed into a crankcase is guided to a cylinder head cover, and is returned from the cylinder head cover to a downstream side of a throttle valve in an intake pipe.
By the way, since oil is mixed in the blow-by gas, an oil separator is interposed in the blow-by gas recirculation system, the oil is removed by the oil separator, and the air is recirculated to the intake pipe.
As such an oil separator, a baffle plate type oil that separates oil by forming a separator chamber in a cylinder head cover, erecting a baffle plate in the chamber, and causing blow-by gas passing through the chamber to collide with the baffle plate There is a separator (for example, Patent Documents 1 and 2).
実開平２−３５９１２号公報Japanese Utility Model Publication No. 2-35912 特開２０００−２７４２２５号公報JP 2000-274225 A
　ところで、上記のような邪魔板式オイルセパレータには、特に二輪車のような小気筒エンジンにおいては、図６に示した構成のものがある。つまり、シリンダヘッドに側方から被せられる構成の合成樹脂製シリンダヘッドカバー５１に、図６に示すように、側方に開口する凹部５２を形成するとともに、該凹部５２内に邪魔板５３を立設し、図６（ｂ）に示すように、凹部開口に合成樹脂製プレート５４を被せて、セパレータ室５５を画成している邪魔板式オイルセパレータ５０がある。
　このようなオイルセパレータ５０では、図６（ａ）に示すように、プレート５４を凹部５２の開口周縁にビス５６等によって固定している。そして、開口縁とプレート５４との合わせ部はほぼ垂直方向に向くこととなる。そのため、プレート５４が反ったりして変形し、シリンダヘッドカバー５１との間に隙間が生じると、その隙間からエンジンで攪拌されたオイルが直接セパレータ室５５に流入し、オイル分離性能が悪化すると言う問題があった。
　本発明は、上記のような事情に鑑みて、セパレータ室へのオイルの侵入を可及的に防止したオイルセパレータを提供することを目的とする。 Incidentally, the baffle plate type oil separator as described above has a configuration shown in FIG. 6 particularly in a small cylinder engine such as a motorcycle. That is, the synthetic resin cylinder head cover 51 configured to cover the cylinder head from the side is formed with a concave portion 52 that opens to the side as shown in FIG. 6, and the baffle plate 53 is erected in the concave portion 52. As shown in FIG. 6B, there is a baffle plate type oil separator 50 that covers a recess opening and covers a synthetic resin plate 54 to define a separator chamber 55.
In such an oil separator 50, as shown in FIG. 6A, the plate 54 is fixed to the periphery of the opening of the recess 52 with screws 56 or the like. And the joint part of an opening edge and the plate 54 will face a substantially perpendicular direction. Therefore, when the plate 54 is warped and deformed and a gap is formed between the plate 54 and the cylinder head cover 51, the oil stirred by the engine from the gap directly flows into the separator chamber 55, and the oil separation performance deteriorates. was there.
In view of the above circumstances, an object of the present invention is to provide an oil separator that prevents oil from entering the separator chamber as much as possible.
　上記した目的を達成するため、本発明は、次の〔１〕~〔３〕のオイルセパレータとした。
　〔１〕シリンダヘッドカバーに凹部を形成するとともに内部に邪魔板を立設し、前記凹部の開口にプレートを被せてセパレータ室を画成するオイルセパレータにおいて、前記凹部の開口周縁に切欠きを周設し、該切欠きに前記プレートを装着させたことを特徴とする、オイルセパレータ。
　〔２〕上記切欠きの深さを、上記プレートの厚みよりも深くしたことを特徴とする、〔１〕に記載のオイルセパレータ。
　〔３〕上記プレートの周縁にリブを形成したことを特徴とする、〔１〕又は〔２〕に記載のオイルセパレータ。 In order to achieve the above object, the present invention provides the following oil separators [1] to [3].
[1] An oil separator in which a recess is formed in the cylinder head cover and a baffle plate is erected inside, and a plate is placed over the opening of the recess to define a separator chamber, and a notch is provided around the opening periphery of the recess. An oil separator, wherein the plate is attached to the notch.
[2] The oil separator according to [1], wherein a depth of the notch is deeper than a thickness of the plate.
[3] The oil separator according to [1] or [2], wherein a rib is formed on a peripheral edge of the plate.
　上記した〔１〕のオイルセパレータによれば、プレートがオイルセパレータのセパレータ室を画成する凹部の開口に形成された切欠きに装着されるので、切欠きの壁面とプレートの周面とによってラビリンスシールが形成され、プレートが変形してシリンダヘッドカバーとプレート間に隙間が生じたとしても、オイルのセパレート室への流入を防ぐことができる。また、プレートのシリンダヘッドカバーへの接合も、例えば、点接合も可能になり、製造工程の簡略化が期待できる。
　また、上記した〔２〕のオイルセパレータによれば、プレートが切欠きに埋没するので、シール効果の向上をより期待できる。
　さらに、上記した〔３〕のオイルセパレータによれば、プレートの反り等の変形を可及的に防止することができる。 According to the above oil separator of [1], the plate is mounted on the notch formed in the opening of the recess defining the separator chamber of the oil separator, so that the labyrinth is formed by the wall surface of the notch and the peripheral surface of the plate. Even if a seal is formed and the plate is deformed to form a gap between the cylinder head cover and the plate, the oil can be prevented from flowing into the separation chamber. Further, the plate can be joined to the cylinder head cover, for example, by point joining, and simplification of the manufacturing process can be expected.
Further, according to the oil separator [2] described above, since the plate is buried in the notch, the improvement of the sealing effect can be further expected.
Furthermore, according to the above oil separator [3], deformation such as warpage of the plate can be prevented as much as possible.
　図１は、本発明に係るオイルセパレータを搭載したエンジンを示した図である。
　図２は、本発明に係るオイルセパレータを設置したシリンダヘッドカバーの概念的な外観図である。
　図３は、図２のシリンダヘッドカバーの内部を示した図であって、（ａ）図は図２におけるＡ−Ａ線に沿う部分の縦断面斜視図、（ｂ）図は（ａ）図における円部の拡大図である。
　図４は、図２におけるＢ−Ｂ線に沿う部分の横断面図である。
　図５は、プレートを示した斜視図で、（ａ）図は表面側（セパレータ室側）を示し、（ｂ）図は裏面側を示している。
　図６は、従来のオイルセパレータにおけるプレートの取り付け状態を示したもので、（ａ）図はシリンダヘッド側から視た底面図、（ｂ）図は（ａ）図におけるＣ−Ｃ線に沿う部分の縦断面図である。 FIG. 1 is a view showing an engine equipped with an oil separator according to the present invention.
FIG. 2 is a conceptual external view of a cylinder head cover provided with an oil separator according to the present invention.
3 is a view showing the inside of the cylinder head cover of FIG. 2, wherein (a) is a longitudinal sectional perspective view of a portion along line AA in FIG. 2, and (b) is in FIG. It is an enlarged view of a circle part.
4 is a cross-sectional view of a portion along the line BB in FIG.
5A and 5B are perspective views showing the plate, in which FIG. 5A shows the front side (separator chamber side), and FIG. 5B shows the back side.
6A and 6B show a state where the plate is attached to a conventional oil separator. FIG. 6A is a bottom view as viewed from the cylinder head side, and FIG. 6B is a portion along line CC in FIG. FIG.
　以下、上記した本発明に係るオイルセパレータを、図面に示した実施の形態に基づいて、詳細に説明する。
　図１に示したエンジン１は、シリンダ２の軸心がほぼ水平に設置され、シリンダヘッドにシリンダヘッドカバー３が側方から被せられている。そして、オイルセパレータ１０は、シリンダヘッドカバー３に設置されている。
　このシリンダヘッドカバー３では、図２に示すように、シリンダヘッドカバー３の天井が外方に膨出され、その膨出部１１の内部に、図３（ａ）に示すように、エンジンのカムシャフト４側（図３において、側方側）に開口する凹部１２が形成されている。この凹部１２には、天井壁１１ａに３枚の邪魔板１３（１３ａ，１３ｂ，１３ｃ）が立設されている。
　図４に示すように、邪魔板１３のうち中央の邪魔板１３ｂは、一方の側壁１１ｂから対向する他方の側壁１１ｃに向けて延び、その先端が他方の側壁１１ｃと適宜な間隙ａをもって位置されている。この邪魔板１３ｂを挟むようにして配置される邪魔板１３ａ，１３ｃは、他方の側壁１１ｃから対向する一方の側壁１１ｂに向けて延び、その先端が一方の側壁１１ｂと適宜な間隙ａをもって位置されている。そして、これらの邪魔板１３ａ，１３ｂ，１３ｃは、先端がそれぞれ下方に向けて傾斜するようにして配置されている。
　また、凹部１２を画成する他の側壁（図４において、上部側壁）１１ｄには排気ポート１４が貫設され、該排気ポート１４に接続したホース４によって吸気管５のスロットルバルブ６の上流に連通されている（図１参照）。
　凹部１２の開口は、図３に示すように、プレート１５によって閉塞されている。このプレート１５は、図５に示すように、一部の隅部に切欠き（ブローバイガス導入口）１５ａが形成され、背面周縁にリブ１５ｂが立設されている。なお、リブ１５ｂは、プレート１５の全周縁に形成されていれば強度的に有利であるが、必ずしも全周でなくてもよく、また断続的に形成されていてもよい。また、プレート１５がほぼ垂直に取り付けられるものである場合には、上方部の周縁のみにリブ１５ｂを形成したものとしてもよい。
　凹部１２の開口周縁には、切欠き１６が周設されている。そして、プレート１５は、図３（ａ）に示すように、この切欠き１６内に嵌め込まれるようにして設置され、熱カシメ，点溶着等の適宜な手段によって凹部１２の開口周縁に取り付けられ、ブローバイガスが下方から上方に向かって流れるセパレータ室１７が画成される。
　このようにして取り付けられたプレート１５は、図３（ｂ）に示すように、切欠き１６の壁面との間にラビリンスシール１８が構成される。ここで、凹部１２に形成された切欠き１６の深さＷ１を、プレート１５の板厚（リブ１５ｂが形成されている場合は、その高さを含む）Ｗ２よりも大きく（深く）すれば、シール効果をより高めることができる。また、プレート１５を切欠き１６の側壁との間隙を可及的に小さくすれば、やはりシール効果をより高めることができる。
　特に、図１に示すように、シリンダ２の軸心がほぼ水平になるようにして車体に登載された小気筒エンジン１においては、シリンダヘッドカバー３は、先にも記載したように側方から被せられることとなる。そして、該シリンダヘッドカバー３に形成された凹部１２の開口は側方を向くこととなり、該側方に開口する凹部１２を閉塞するプレート１５は、ほぼ垂直に切欠き１６に嵌め込まれることとなる。この場合、上記したように切欠き１６の深さＷ１を、プレート１５の板厚Ｗ２よりも大きいものとすれば、プレート１５は切欠き１６から突出することなく埋没することとなるので、切欠き１６がひさしの作用を果たし、上方から垂れてきたオイルが切欠き１６とプレート１５との隙間に入り込むことを効果的に阻止することができ、シール効果がより顕著にあらわれる。
　また、切欠き１６の内寸法をプレート１５の外寸法とほぼ同一のものとし、プレート１５を切欠き１６に嵌入、更には圧入することにより装着するものとした場合には、プレート１５と切欠き１６の側壁との間にオイルが侵入するような隙間がないものとなるとともに、切欠き１６の側壁との摩擦抵抗によりプレート１５の反り等の変形が生じ難いものとなり、更にシール効果の高いものとなる。
　このように構成されたオイルセパレータ１０では、シリンダヘッドカバー３内のブローバイガスが、図４に示すように、プレート１５のブローバイガス導入口１５ａを介してセパレータ室１７に導かれ、点線の矢印で示したように、邪魔板１３ａ，１３ｂ，１３ｃによって画成される通路を経て排気ポート１４から排出される。その間に、ブローバイガスは、邪魔板１３に衝突し、邪魔板１３に沿って進路が変更され、ブローバイガス中のオイルが分離される。そして、分離されたオイルは、実線の矢印で示したように、下方に流れ落ちてブローバイガス導入口１５ａからシリンダヘッドカバー３内に戻される。また、邪魔板１３ａ，１３ｂ，１３ｃによって画成される通路を通過して、オイルが分離されたブローバイガスは、吸気管５に還流される。
　以上、本発明に係るオイルセパレータの実施の形態を説明したが、本発明は、何ら既述の実施の形態に限定されるものではなく、請求の範囲に記載した本発明の技術的思想の範囲内において、種々の変形及び変更が可能であることは当然である。
　例えば、上記実施の形態のオイルセパレータは、シリンダの軸心がほぼ水平になるようにして車体に登載された小気筒エンジンに構成された場合を示しているが、本発明は、セパレータ室が、シリンダヘッドカバーに形成した凹部と、その凹部の開口を閉塞するプレートとによって形成されるものであれば、エンジンの搭載姿勢等に限定されない。 Hereinafter, the oil separator according to the present invention will be described in detail based on the embodiments shown in the drawings.
In the engine 1 shown in FIG. 1, the axial center of the cylinder 2 is installed substantially horizontally, and the cylinder head cover 3 is covered from the side on the cylinder head. The oil separator 10 is installed on the cylinder head cover 3.
In this cylinder head cover 3, as shown in FIG. 2, the ceiling of the cylinder head cover 3 bulges outward, and inside the bulging portion 11 as shown in FIG. A recess 12 is formed that opens to the side (the side in FIG. 3). In this recess 12, three baffle plates 13 (13a, 13b, 13c) are erected on the ceiling wall 11a.
As shown in FIG. 4, the central baffle plate 13b of the baffle plates 13 extends from one side wall 11b toward the opposite side wall 11c, and the tip thereof is positioned with an appropriate gap a from the other side wall 11c. ing. The baffle plates 13a and 13c arranged so as to sandwich the baffle plate 13b extend from the other side wall 11c toward the one side wall 11b facing each other, and the tip thereof is positioned with an appropriate gap a from the one side wall 11b. . These baffle plates 13a, 13b, and 13c are arranged such that their tips are inclined downward.
Further, an exhaust port 14 is provided in the other side wall 11d defining the recess 12 (upper side wall in FIG. 4), and the hose 4 connected to the exhaust port 14 is provided upstream of the throttle valve 6 of the intake pipe 5. It is connected (refer FIG. 1).
The opening of the recess 12 is closed by a plate 15 as shown in FIG. As shown in FIG. 5, the plate 15 has notches (blow-by gas inlets) 15a at some corners, and ribs 15b are erected on the back periphery. The ribs 15b are advantageous in terms of strength as long as they are formed on the entire periphery of the plate 15. However, the ribs 15b may not necessarily be the entire periphery, and may be formed intermittently. Further, when the plate 15 is attached substantially vertically, the rib 15b may be formed only on the peripheral edge of the upper portion.
A notch 16 is provided around the periphery of the opening of the recess 12. Then, as shown in FIG. 3 (a), the plate 15 is installed so as to be fitted into the notch 16, and is attached to the opening peripheral edge of the recess 12 by appropriate means such as heat caulking or spot welding, A separator chamber 17 in which blow-by gas flows from below to above is defined.
A labyrinth seal 18 is formed between the plate 15 attached in this way and the wall surface of the notch 16 as shown in FIG. Here, if the depth W1 of the notch 16 formed in the recess 12 is larger (deeper) than the plate thickness (including the height of the rib 15b when the rib 15b is formed) W2, The sealing effect can be further enhanced. Further, if the gap between the plate 15 and the side wall of the notch 16 is made as small as possible, the sealing effect can be further enhanced.
In particular, as shown in FIG. 1, in the small cylinder engine 1 mounted on the vehicle body so that the axis of the cylinder 2 is substantially horizontal, the cylinder head cover 3 is covered from the side as described above. Will be. Then, the opening of the recess 12 formed in the cylinder head cover 3 faces sideways, and the plate 15 that closes the recess 12 opening to the side is fitted into the notch 16 almost vertically. In this case, if the depth W1 of the notch 16 is larger than the plate thickness W2 of the plate 15 as described above, the plate 15 will be buried without protruding from the notch 16, so the notch 16 acts as an eaves and can effectively prevent the oil dripping from above from entering the gap between the notch 16 and the plate 15, and the sealing effect becomes more prominent.
Further, when the inner dimension of the notch 16 is substantially the same as the outer dimension of the plate 15 and the plate 15 is fitted into the notch 16 and further fitted by press fitting, the notch with the plate 15 There is no gap for oil to enter between the side walls of 16 and the frictional resistance with the side walls of the notch 16 makes it difficult for deformation such as warpage of the plate 15 to occur, and a higher sealing effect. It becomes.
In the oil separator 10 configured as described above, the blow-by gas in the cylinder head cover 3 is guided to the separator chamber 17 through the blow-by gas inlet 15a of the plate 15 as shown in FIG. As described above, the gas is discharged from the exhaust port 14 through a passage defined by the baffle plates 13a, 13b, and 13c. Meanwhile, the blow-by gas collides with the baffle plate 13, the course is changed along the baffle plate 13, and the oil in the blow-by gas is separated. The separated oil flows down and returns to the cylinder head cover 3 from the blow-by gas inlet 15a as indicated by the solid arrow. Further, the blow-by gas from which the oil has been separated through the passage defined by the baffle plates 13a, 13b, and 13c is returned to the intake pipe 5.
Although the embodiment of the oil separator according to the present invention has been described above, the present invention is not limited to the embodiment described above, and the scope of the technical idea of the present invention described in the claims. Of course, various modifications and changes are possible.
For example, the oil separator of the above embodiment shows a case where it is configured in a small cylinder engine mounted on the vehicle body so that the cylinder axis is substantially horizontal, but the present invention has a separator chamber, As long as it is formed by a recess formed in the cylinder head cover and a plate that closes the opening of the recess, the mounting posture of the engine is not limited.
　本発明に係るオイルセパレータによれば、オイルのセパレート室への不都合な流入を防ぐことができ、また、製造工程の簡略化も期待できるものであるので、自動車のエンジンのブローバイガス還流系に設置されるオイルセパレータとして、好適に利用することができる。 According to the oil separator according to the present invention, it is possible to prevent inconvenient inflow of oil into the separation chamber and to expect simplification of the manufacturing process. Therefore, the oil separator is installed in the blow-by gas recirculation system of the automobile engine. As an oil separator to be used, it can be suitably used.
　１　エンジン
　２　シリンダ
　３　シリンダヘッドカバー
　４　ホース
　５　吸気管
　６　スロットルバルブ
　１０　オイルセパレータ
　１１　膨出部
　１１ａ　天井壁
　１１ｂ~１１ｄ　側壁
　１２　凹部
　１３，１３ａ~１３ｃ　邪魔板
　１４　排気ポート
　１５　プレート
　１５ａ　切欠き（ブローバイガス導入口）
　１５ｂ　リブ
　１６　切欠き
　１７　セパレータ室
　Ｗ１　切欠きの深さ
　Ｗ２　プレートの板厚 DESCRIPTION OF SYMBOLS 1 Engine 2 Cylinder 3 Cylinder head cover 4 Hose 5 Intake pipe 6 Throttle valve 10 Oil separator 11 Expansion part 11a Ceiling wall 11b-11d Side wall 12 Recess 13, 13a-13c Baffle plate 14 Exhaust port 15 Plate 15a Notch (Blow-by gas introduction) mouth)
15b Rib 16 Notch 17 Separator chamber W1 Notch depth W2 Plate thickness

Claims (3)

  1. 　シリンダヘッドカバーに凹部を形成するとともに内部に邪魔板を立設し、前記凹部の開口にプレートを被せてセパレータ室を画成するオイルセパレータにおいて、前記凹部の開口周縁に切欠きを周設し、該切欠きに前記プレートを装着させたことを特徴とする、オイルセパレータ。 In the oil separator in which a recess is formed in the cylinder head cover and a baffle plate is erected, and a separator chamber is defined by covering the opening of the recess with a plate, a notch is provided around the periphery of the opening of the recess. An oil separator, wherein the plate is mounted in a notch.
  2. 　前記切欠きの深さを、前記プレートの厚みよりも深くしたことを特徴とする、請求項１に記載のオイルセパレータ。 The oil separator according to claim 1, wherein a depth of the notch is deeper than a thickness of the plate.
  3. 　前記プレートの周縁にリブを形成したことを特徴とする、請求項１または２に記載のオイルセパレータ。 The oil separator according to claim 1 or 2, wherein a rib is formed on a peripheral edge of the plate.
PCT/JP2013/065908 2012-11-21 2013-06-04 Oil separator WO2014080656A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012-254962 2012-11-21
JP2012254962A JP5394558B1 (en) 2012-11-21 2012-11-21 Oil separator

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WO2014080656A1 true WO2014080656A1 (en) 2014-05-30

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5754643U (en) * 1980-09-17 1982-03-30
JPS59167906U (en) * 1983-04-26 1984-11-10 愛知機械工業株式会社 Oil separation device for internal combustion engine rocker cover
JPS61169218U (en) * 1985-04-10 1986-10-20
JPS6226515U (en) * 1985-07-31 1987-02-18
JPH0783020A (en) * 1993-09-16 1995-03-28 Nissan Motor Co Ltd Oil separater structure of internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5754643U (en) * 1980-09-17 1982-03-30
JPS59167906U (en) * 1983-04-26 1984-11-10 愛知機械工業株式会社 Oil separation device for internal combustion engine rocker cover
JPS61169218U (en) * 1985-04-10 1986-10-20
JPS6226515U (en) * 1985-07-31 1987-02-18
JPH0783020A (en) * 1993-09-16 1995-03-28 Nissan Motor Co Ltd Oil separater structure of internal combustion engine

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JP2014101828A (en) 2014-06-05

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