US20090084342A1 - Crankcase Scavenging Mechanism for a Four-Stroke Engine - Google Patents

Crankcase Scavenging Mechanism for a Four-Stroke Engine Download PDF

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Publication number
US20090084342A1
US20090084342A1 US12/281,800 US28180007A US2009084342A1 US 20090084342 A1 US20090084342 A1 US 20090084342A1 US 28180007 A US28180007 A US 28180007A US 2009084342 A1 US2009084342 A1 US 2009084342A1
Authority
US
United States
Prior art keywords
cylinder head
oil
crankcase
way valve
gas
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.)
Abandoned
Application number
US12/281,800
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English (en)
Inventor
Xiao Henglin
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
Assigned to WUXI KIPOR POWER CO., LTD. reassignment WUXI KIPOR POWER CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: XIAO, HENGLIN
Publication of US20090084342A1 publication Critical patent/US20090084342A1/en
Abandoned legal-status Critical Current

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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.
  • 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 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
  • 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.
  • FIG. 1 is a longitudinal sectional view of the structure of the present invention
  • FIG. 2 is a transversal sectional view of the structure of the present invention
  • FIG. 3 is a bottom view at portion A shown in FIG. 2 ;
  • FIG. 4 is a section view along line A-A shown in FIG. 3 .
  • 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
  • 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)
US12/281,800 2006-03-08 2007-01-25 Crankcase Scavenging Mechanism for a Four-Stroke Engine Abandoned US20090084342A1 (en)

Applications Claiming Priority (3)

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
CN200610038698.1 2006-03-08
PCT/CN2007/000290 WO2007101387A1 (en) 2006-03-08 2007-01-25 Breather device of crankcase for 4-cycle engine

Publications (1)

Publication Number Publication Date
US20090084342A1 true US20090084342A1 (en) 2009-04-02

Family

ID=36918522

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/281,800 Abandoned US20090084342A1 (en) 2006-03-08 2007-01-25 Crankcase Scavenging Mechanism for a Four-Stroke Engine

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)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110067659A1 (en) * 2009-09-24 2011-03-24 Makita Corporation Lubrication system for portable four-stroke engine
US20130118440A1 (en) * 2011-11-14 2013-05-16 Yuki Nakamura Lubrication apparatus for four-stroke engine
CN106795789A (zh) * 2014-10-07 2017-05-31 布鲁斯密封系统有限公司 用于内燃机的通气模块
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

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
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
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

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4667647A (en) * 1984-03-15 1987-05-26 Honda Giken Kogyo Kabushiki Kaisha Crankcase ventilating system and method of removing oil mist from gas in the system
US5129371A (en) * 1991-09-03 1992-07-14 Saturn Corporation Cam cover oil separator for crankcase ventilation
US5183075A (en) * 1986-04-12 1993-02-02 Stein Guenter Check valve
US5829952A (en) * 1995-05-19 1998-11-03 Shadden; Darrel W. Check valve with a reversible valve ball and seat
US5887563A (en) * 1996-03-19 1999-03-30 Honda Giken Kogyo Kabushiki Kaisha Working 4-cycle engine
US20020083934A1 (en) * 2001-01-02 2002-07-04 Ruehlow Gerald C. Breather for internal combustion engine
US7699029B2 (en) * 2007-07-26 2010-04-20 Cummins Filtration Ip, Inc. Crankcase ventilation system with pumped scavenged oil
US7757584B2 (en) * 2005-05-20 2010-07-20 Yamaha Hatsudoki Kabushiki Kaisha Connecting rod and internal combustion engine and automotive vehicle incorporating the same
US7789077B2 (en) * 2006-04-11 2010-09-07 Honda Motor Co., Ltd. Crankcase of internal combustion engine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1221426B (it) 1988-05-13 1990-07-06 Lombardini Fabbr Ital Motori S Coperchio del vano bilancieri delle valvole per motori a combustione interna,con dispositivo antirisucchio dell' olio lubrificante
JP3866394B2 (ja) * 1997-10-22 2007-01-10 本田技研工業株式会社 エンジンのブリーザ装置
JP3967552B2 (ja) * 2001-02-19 2007-08-29 本田技研工業株式会社 エンジン用気液分離装置
CN2499581Y (zh) * 2001-10-12 2002-07-10 常柴股份有限公司 柴油机齿轮室的呼吸器
JP4344579B2 (ja) * 2003-10-15 2009-10-14 株式会社マーレ フィルターシステムズ シリンダヘッドカバーのオイルセパレータ
JP2005201080A (ja) * 2004-01-13 2005-07-28 Toyota Industries Corp シリンダヘッドカバー
CN2727405Y (zh) * 2004-09-15 2005-09-21 重庆宗申技术开发研究有限公司 内燃机呼吸装置

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4667647A (en) * 1984-03-15 1987-05-26 Honda Giken Kogyo Kabushiki Kaisha Crankcase ventilating system and method of removing oil mist from gas in the system
US5183075A (en) * 1986-04-12 1993-02-02 Stein Guenter Check valve
US5129371A (en) * 1991-09-03 1992-07-14 Saturn Corporation Cam cover oil separator for crankcase ventilation
US5829952A (en) * 1995-05-19 1998-11-03 Shadden; Darrel W. Check valve with a reversible valve ball and seat
US5887563A (en) * 1996-03-19 1999-03-30 Honda Giken Kogyo Kabushiki Kaisha Working 4-cycle engine
US20020083934A1 (en) * 2001-01-02 2002-07-04 Ruehlow Gerald C. Breather for internal combustion engine
US7757584B2 (en) * 2005-05-20 2010-07-20 Yamaha Hatsudoki Kabushiki Kaisha Connecting rod and internal combustion engine and automotive vehicle incorporating the same
US7789077B2 (en) * 2006-04-11 2010-09-07 Honda Motor Co., Ltd. Crankcase of internal combustion engine
US7699029B2 (en) * 2007-07-26 2010-04-20 Cummins Filtration Ip, Inc. Crankcase ventilation system with pumped scavenged oil

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110067659A1 (en) * 2009-09-24 2011-03-24 Makita Corporation Lubrication system for portable four-stroke engine
US8701622B2 (en) * 2009-09-24 2014-04-22 Makita Corporation Lubrication system for portable four-stroke engine
US20130118440A1 (en) * 2011-11-14 2013-05-16 Yuki Nakamura Lubrication apparatus for four-stroke engine
US8746203B2 (en) * 2011-11-14 2014-06-10 Makita Corporation Lubrication apparatus for four-stroke engine
CN106795789A (zh) * 2014-10-07 2017-05-31 布鲁斯密封系统有限公司 用于内燃机的通气模块
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

Also Published As

Publication number Publication date
TR200806687T1 (tr) 2009-01-21
CN1818355A (zh) 2006-08-16
ES2386019T3 (es) 2012-08-07
EP1995418B1 (de) 2012-04-25
EP1995418A1 (de) 2008-11-26
WO2007101387A1 (en) 2007-09-13
ATE555277T1 (de) 2012-05-15
AU2007222812A1 (en) 2007-09-13
AU2007222812B2 (en) 2011-06-30
CN100383365C (zh) 2008-04-23
EP1995418A4 (de) 2011-01-05

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Legal Events

Date Code Title Description
AS Assignment

Owner name: WUXI KIPOR POWER CO., LTD., CHINA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:XIAO, HENGLIN;REEL/FRAME:022021/0449

Effective date: 20080821

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION