EP1995418B1 - Entlüftervorrichtung für das kurbelgehäuse eines viertaktmotors - Google Patents

Entlüftervorrichtung für das kurbelgehäuse eines viertaktmotors Download PDF

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Publication number
EP1995418B1
EP1995418B1 EP07702208A EP07702208A EP1995418B1 EP 1995418 B1 EP1995418 B1 EP 1995418B1 EP 07702208 A EP07702208 A EP 07702208A EP 07702208 A EP07702208 A EP 07702208A EP 1995418 B1 EP1995418 B1 EP 1995418B1
Authority
EP
European Patent Office
Prior art keywords
cylinder head
oil
crankcase
gas
way valve
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.)
Not-in-force
Application number
EP07702208A
Other languages
English (en)
French (fr)
Other versions
EP1995418A4 (de
EP1995418A1 (de
Inventor
Henglin Xiao
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.)
Wuxi Kipor Power Co Ltd
Original Assignee
Wuxi Kipor Power 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 Wuxi Kipor Power Co Ltd filed Critical Wuxi Kipor Power Co Ltd
Publication of EP1995418A1 publication Critical patent/EP1995418A1/de
Publication of EP1995418A4 publication Critical patent/EP1995418A4/de
Application granted granted Critical
Publication of EP1995418B1 publication Critical patent/EP1995418B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F01M13/0416—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil arranged in valve-covers
    • 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
    • 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
    • F01M2013/0488—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil with oil trap in the return conduit to the crankcase

Definitions

  • the present invention relates to a crankcase scavenging mechanism for a four-stroke engine in the technical field of power device, in particular to a crankcase scavenging mechanism which can effectively prevent the lubricating oil from entering the suction system while oil mist separation effect is well during the operation of the engine.
  • the scavenging mechanism should effectively expel the exhaust gases and separate the oil mist well to prevent the lubricating oil from entering into the suction system.
  • the scavenging mechanism is located such that it is well separated from the lubricating oil during the operation of the engine.
  • the scavenging mechanism tends to have no good effect of oil-returning; furthermore, the one-way valve is of wafer type, which the one-way valve is not opened or can not be reset due to occurrence of abrasion, aging, deformation or losing elasticity, so that the leakage of the engine oil is caused.
  • EP 0341770 discloses a cover for the valve rocker compartment of internal combustion engines.
  • the cover comprises a hollow shaped casing for closing the compartment containing the rockers which operate the engine intake and exhaust valves, and a duct system which connects said shaped casing to the engine air intake manifold.
  • the duct system is intercepted by a valving member which is kept in the open position by an elastic member of predetermined load, but closes said duct system when the vacuum in the manifold reaches an undesirable value.
  • the internal combustion engine has an auxiliary equipment mounted on side wall of the cylinder block through a reinforcement bracket so that a breather chamber is formed between the side wall of the cylinder block and the reinforcement bracket.
  • the auxiliary equipment would cause the increasing of parts number and the complexity of structure, which is not advantageous to light-weight design.
  • an objective of the present invention is to provide a compact and reliable scavenging mechanism for an engine, in which the remained gases in the crankcase can be sucked into the suction tube via a communication passage and then enter into the combustion chamber for combustion during the operation of the engine, while the lubricating oil can be prevented from entering the suction system by air-fuel separation and oil-returning effect is well.
  • the scavenging mechanism is totally arranged inside the engine with better space utilization efficiency so as not to enlarge dimensions of the engine, while ensuring weight-reducing of the four-stroke engine with the scavenging mechanism.
  • a main body 1 according to the present invention of the engine comprises a casing 7, a cylinder sleeve 8 and a cylinder head 9; wherein a crankcase 6 of the engine is assembled from the casing 7 and a crankcase cover 2, the crankcase 6 being provided with a rotatable support crankshaft 4 therein and containing lubricating oil 35; a valve operating chamber 5 is assembled from the cylinder head 9 and a cylinder head cover 3 and is communicated with the crankcase 6; a piston 10 is connected to a crankpin of the crankshaft 4 via a connecting rod 11; the cylinder head 9 is communicated with a combustion chamber 19; a suction system 20 is held on the cylinder head 9 to communicate with a gas inlet 17 of the cylinder head 9; the cylinder head cover 3 is arranged on the cylinder head 9; the present invention is characterized in that the cylinder head cover 3 is provided with a gas-oil separating cavity 23 on the top thereof, the gas-oil separating cavity 23 being of labyrin
  • the present invention has the following advantages:
  • the crankcase scavenging mechanism for a four-stroke engine in the present invention has a simple, compact and reasonable structure. Secondly, the remained gases in the crankcase can be sucked into the suction tube via a communication passage and then enter into the combustion chamber for combustion during the operation of the engine, while the lubricating oil can be prevented from entering the suction system by air-fuel separation and oil-returning effect is well. Finally, the scavenging mechanism is totally arranged inside the engine with better space utilization efficiency so as not to enlarge dimensions of the engine, while ensuring light-weight of the four-stroke engine with the scavenging mechanism.
  • the present invention comprises a main body 1 of the engine, a crankcase cover 2, a cylinder head cover 3, a crankshaft 4, a valve operating chamber 5, a crankcase 6, an engine casing 7, a cylinder sleeve 8, a cylinder head 9, a piston 10, a connecting rod 11, a connecting-rod cap 12 for big-end of the connecting rod, an oil-scattering needle 13, ball bearings 15 and 16, a gas inlet 17, a gas outlet 18, a combustion chamber 19, a suction system 20, an air filter 21, a carburetor 22, a gas-oil separating cavity 23, a bolt 24, a partition plate 25, an oil-gas separation chamber 26, a one-way valve 27, a one-way valve hole 28, a valve seat 29, a plastic ball 30, a cylindrical pin 31, a seal ring 32, a cylinder head cover passage 33, an oil-returning hole 34, lubricating oil 35, labyrinth-forming walls 36, a passage 37, an inclined orifice 38, a plug 39, a
  • the present invention is directed to a four-stroke engine.
  • the main body 1 of the engine comprises the casing 7, the cylinder sleeve 8 and the cylinder head 9.
  • the crankcase 6 of the engine is assembled from the casing 7 and the crankcase cover 2.
  • the crankcase 6 contains lubricating oil 35 and is provided with a rotatable support crankshaft 4 therein which is oriented horizontally during the operation of the engine.
  • the valve operating chamber 5 is assembled from the cylinder head 9 and the cylinder head cover 3 and is communicated with the crankcase 6.
  • the piston 10 is connected to the crankpin of the crankshaft 4 via the connecting rod 11.
  • the oil-scattering needle 13 integrally formed on the connecting-rod cap 12 for big-end of the connecting rod is used for scattering the lubricating oil 35 in the crankcase 6. Both ends of the crankshaft 4 are supported by the ball bearing 15 and bearing block 16.
  • the cylinder head 9 comprises the gas inlet 17 and the gas outlet 18 which are communicating with the combustion chamber 19.
  • the suction system 20 comprises the air filter 21 and the carburetor 22 and is held on the cylinder head 9 to communicate with the gas inlet 17.
  • the cylinder head cover 3 is arranged on the cylinder head 9 and is provided with the gas-oil separating cavity 23 on the top thereof.
  • the gas-oil separating cavity 23 is of labyrinth formed by three labyrinth-forming walls 36 and is communicated with the valve operating chamber 5 via the passage 37; furthermore, the gas-oil separating cavity 23 is connected to the partition plate 25 by the bolt 24 to form the oil-gas separation chamber 26.
  • the one-way valve 27 is provided on the oil-gas separation chamber 26 and installed in the one-way valve hole 28.
  • the one-way valve 27 comprises the valve seat 29, the plastic ball 30 within the valve seat 29, the cylindrical pin 31 and the seal ring 32.
  • the cylinder head cover passage 33 is located above the one-way valve 27.
  • a portion of the passage 33 is in a form of the inclined orifice 38, one end of which is blocked by the plug 39, the other end of which communicates with the cylinder head 9 through the hollow pin 40 and further communicates with suction tube 14 through the cylinder head communication passage 41.
  • the oil-returning hole 34 is formed between the inclined orifice 38 of the passage 33 and the oil-gas separation chamber 26 so as to separate the lubricating oil and thereby prevent the lubricating oil from entering into the suction system.
  • the oil-scattering needle 13 on the connecting-rod cap 12 for big-end of the connecting rod scatters the lubricating oil 35 and then the lubricating oil 35 in a form of oil mist reaches the valve operating room 5 via the crankcase 6.
  • the scavenging gas appeared in the crankcase 6 also enters into the valve operating room 5 and further into the oil-gas separation chamber 26 via the passage 37.
  • the plastic ball 30 of the one-way valve 27 is pushed out so that the scavenging gas enters into the cylinder head cover passage 33 and then into the suction tube 14 through the hollow pin 40 and the cylinder head communication passage 41 and finally into the combustion chamber 19 via an intake valve.
  • the scavenging gas goes through the gas-oil separating cavity 23, the oil mist is separated from the oil gas mixture by the labyrinth-forming walls 36 and then returns to the crankcase 6 via the passage 37.
  • the oil mist will be separated again and returns to the oil-gas separation chamber 26 via the oil-returning hole 34, thereby enhancing the capability of oil mist separation. Additionally, when the one-way valve 27 installed in the one-way valve hole 28 is closed, the seal ring 32 of the one-way valve 27 can reliably prevent the oil mist from entering into the cylinder head cover passage 33.
  • the plastic ball 30 can move freely in the valve seat 29 and can self-return due to its gravity so as to prevent the redundant gas sucked by the suction system 20 from entering into the crankcase 6.
  • the scavenging mechanism is totally arranged inside the engine with better space utilization efficiency so as not to enlarge dimensions of the engine, which can also be utilized for any four-stroke engine.
  • the remained gases in the crankcase can be sucked into the suction tube via a communication passage and then enter into the combustion chamber for combustion, while the lubricating oil can be prevented from entering the suction system by oil mist separation and oil-returning effect is well.

Landscapes

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

Claims (3)

  1. Viertaktmotor mit einem Kurbelgehäusespülungsmechanismus, mit:
    einem Hauptkörper (1) mit einem Gehäuse (7), einer Zylinderbuchse (8) und einem Zylinderkopf (9);
    einem Kurbelgehäuse (6), das aus dem Gehäuse (7) und einer Kurbelgehäuseabdeckung (2) zusammengesetzt ist, wobei im Kurbelgehäuse (6) eine Kurbelwelle (4) und Schmieröl (35) angeordnet sind;
    einer Ventilbetriebskammer (5), die aus dem Zylinderkopf (9) und einer Zylinderkopfabdeckung (3) zusammengesetzt ist und mit dem Kurbelgehäuse (6) kommuniziert;
    einem Kolben (10), der über eine Verbindungsstange (11) mit einem Kurbelzapfen der Kurbelwelle (4) verbunden ist, wobei der Zylinderkopf (9) mit einer Verbrennungskammer (19) kommuniziert;
    einem Ansaugsystem (20), das auf dem Zylinderkopf (9) gehalten wird und mit einem Gaseinlass (17) kommuniziert; wobei
    die Zylinderkopfabdeckung (3) auf dem Zylinderkopf (9) angeordnet ist,
    auf der Zylinderkopfabdeckung (3) ein Gas/Öl-Trennungshohlraum (23) angeordnet ist,
    der Gas/Öl-Trennungshohlraum (23) über einen Kanal (37) mit der Ventilbetriebskammer (5) kommuniziert und mit einer Trennplatte (25) verbunden ist, um die Öl/Gas-Trennkammer (26) zu bilden,
    auf der Öl/Gas-Trennkammer (26) ein Einwegventil (27) angeordnet ist, wobei das Einwegventil (27) in einem Einwegventilloch (28) angeordnet ist, und
    ein über dem Einwegventil (27) ausgebildeter Kanal (33) eine schräge Öffnung (38) aufweist;
    dadurch gekennzeichnet, dass
    ein Ende der schrägen Öffnung (38) durch einen Verschluss (39) blockiert ist und das andere Ende der schrägen Öffnung (38) mit dem Zylinderkopf (9) kommuniziert und ferner über einen Zylinderkopfkommunikationskanal (41) mit einem Ansaugrohr (14) kommuniziert; und
    ein Ölrücklaufloch (34) zwischen der schrägen Öffnung (38) des Kanals (33) und der Öl/Gas-Trennkammer (26) ausgebildet ist.
  2. Kurbelgehäusespülungsmechanismus für den Viertaktmotor nach Anspruch 1, dadurch gekennzeichnet, dass der Öl/Gas-Trennungshohlraum (23) ein durch drei labyrinthbildende Wände (36) gebildetes Labyrinth ist.
  3. Kurbelgehäusespülungsmechanismus für den Viertaktmotor nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass
    das Einwegventil (27) einen Ventilsitz (29), eine Kunststoffkugel (30), einen zylindrischen Zapfen (31) und einen Dichtungsring (32) aufweist,
    wobei die Kunststoffkugel (30) und der Dichtungsring im Ventilsitz (29) angeordnet sind.
EP07702208A 2006-03-08 2007-01-25 Entlüftervorrichtung für das kurbelgehäuse eines viertaktmotors Not-in-force EP1995418B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNB2006100386981A CN100383365C (zh) 2006-03-08 2006-03-08 四冲程发动机的曲轴箱换气结构
PCT/CN2007/000290 WO2007101387A1 (fr) 2006-03-08 2007-01-25 Ventilateur de carter pour moteur à 4 temps

Publications (3)

Publication Number Publication Date
EP1995418A1 EP1995418A1 (de) 2008-11-26
EP1995418A4 EP1995418A4 (de) 2011-01-05
EP1995418B1 true EP1995418B1 (de) 2012-04-25

Family

ID=36918522

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07702208A Not-in-force EP1995418B1 (de) 2006-03-08 2007-01-25 Entlüftervorrichtung für das kurbelgehäuse eines viertaktmotors

Country Status (8)

Country Link
US (1) US20090084342A1 (de)
EP (1) EP1995418B1 (de)
CN (1) CN100383365C (de)
AT (1) ATE555277T1 (de)
AU (1) AU2007222812B2 (de)
ES (1) ES2386019T3 (de)
TR (1) TR200806687T1 (de)
WO (1) WO2007101387A1 (de)

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SE0602508L (sv) * 2006-11-27 2007-08-28 Atlas Copco Constr Tools Ab Tvåtaktsförbränningsmotor
CN101280704B (zh) * 2008-05-06 2013-07-31 孙鹤鸣 任意翻转四冲程发动机
JP5463111B2 (ja) * 2009-09-24 2014-04-09 株式会社マキタ 携帯型４サイクルエンジンの潤滑装置
CN101943078A (zh) * 2010-08-24 2011-01-12 重庆长安汽车股份有限公司 一种内燃机的气缸盖
CN102192041B (zh) * 2010-12-31 2016-08-17 宁波易能动力科技有限公司 手持工具用四冲程内燃机
JP2013104357A (ja) * 2011-11-14 2013-05-30 Makita Corp ４ストロークエンジンの潤滑装置
EP2937533B1 (de) * 2014-04-24 2017-12-20 BRUSS Sealing Systems GmbH Entlüftungsmodul für einen Verbrennungsmotor
CN104500176A (zh) * 2014-12-29 2015-04-08 无锡华源凯马发动机有限公司 一种单缸风冷柴油机气缸盖罩呼吸器结构
CN104791048A (zh) * 2015-03-17 2015-07-22 浙江亚特电器有限公司 一种发动机润滑系统余气利用装置
CN109763875A (zh) * 2019-01-04 2019-05-17 山东华盛农业药械有限责任公司 汽油机润滑系统的油气分离装置
CN114542239A (zh) * 2022-03-09 2022-05-27 广西玉柴机器股份有限公司 呼吸器低机油含量的发动机

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Also Published As

Publication number Publication date
ES2386019T3 (es) 2012-08-07
ATE555277T1 (de) 2012-05-15
US20090084342A1 (en) 2009-04-02
WO2007101387A1 (fr) 2007-09-13
TR200806687T1 (tr) 2009-01-21
EP1995418A4 (de) 2011-01-05
AU2007222812A1 (en) 2007-09-13
CN100383365C (zh) 2008-04-23
EP1995418A1 (de) 2008-11-26
CN1818355A (zh) 2006-08-16
AU2007222812B2 (en) 2011-06-30

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