EP1655460B1 - Engine - Google Patents

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Publication number
EP1655460B1
EP1655460B1 EP04747366A EP04747366A EP1655460B1 EP 1655460 B1 EP1655460 B1 EP 1655460B1 EP 04747366 A EP04747366 A EP 04747366A EP 04747366 A EP04747366 A EP 04747366A EP 1655460 B1 EP1655460 B1 EP 1655460B1
Authority
EP
European Patent Office
Prior art keywords
breather
decompression
cam
camshaft
rotating body
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.)
Expired - Lifetime
Application number
EP04747366A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1655460A1 (en
EP1655460A4 (en
Inventor
Ryuji c/o Yamaha Hatsudoki Kabushiki Kaisha Inoue
Tatsuya c/o Yamaha Hatsudoki Kabushiki Kaisha Masuda
Shoutarou c/o Yamaha Hatsudoki Kabushiki Kaisha Tanaka
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.)
Yamaha Motor Co Ltd
Original Assignee
Yamaha 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 Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Publication of EP1655460A1 publication Critical patent/EP1655460A1/en
Publication of EP1655460A4 publication Critical patent/EP1655460A4/en
Application granted granted Critical
Publication of EP1655460B1 publication Critical patent/EP1655460B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/08—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio
    • 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
    • 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
    • F01M2013/0422—Separating oil and gas with a centrifuge device
    • 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
    • F01M2013/045—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil using compression or decompression of the gas

Definitions

  • This invention relates to an engine according to the preamble of independent claim 1.
  • Such an engine can be taken from the prior art document WO 02/18751 A1 .
  • a camshaft is provided on a side of a cylinder head to open and close an intake valve and an exhaust valve
  • a decompression device is provided axially of the camshaft to open the intake valve or the exhaust valve to release pressure in a combustion chamber when compression should be effected in the combustion chamber, thereby removing resistance at the time of compression
  • a breather device is provided axially of the camshaft to separate an oil and gases from each other (for example, see JP-A-04-298617 and JP-A-05-156917 ).
  • the invention has been thought of in view of the above and has its object to provide an engine capable of making a space, in which a decompression device and a breather device are arranged, compact.
  • an engine characterized in that a rotating member, to which a drive force is transmitted from a crank shaft, is fixed to a camshaft, a breather rotating body constituting a rotating portion of a breather device is fixed outside the rotating member, the breather rotating body has a cylindrical-shaped annular portion, and a decompression device is arranged inside the annular portion.
  • the decompression device comprise a turning portion and the turning portion is arranged inside the annular portion.
  • the decompression device have one end of a decompression cam connected to the turning portion and have the other end of the decompression cam extended toward an exhaust cam.
  • an outermost portion of the decompression device axially of the camshaft be positioned toward the rotating member from a tip end of the annular portion of the breather rotating body axially of the camshaft.
  • an impeller shaft of a water pump device be detachably fitted into an end of the camshaft toward the breather device and the water pump device be arranged outside and adj acent to the breather device.
  • the breather device comprise a breather stationary body to constitute a stationary portion arranged in opposition to the breather rotating body, the breather stationary body be fixed to that partition, which partitions off the side of the breather device and the side of the water pump device, and the impeller shaft be fitted into and latched on the partition.
  • the breather device comprise a breather stationary body to constitute a stationary portion arranged in opposition to the breather rotating body, the breather stationary body be fixed to that partition, which partitions off the side of the breather device and the side of the water pump device, openings be formed on the partition, and gases separated in the breather device go toward an air cleaner through the openings.
  • Figs. 1 to 7 show the embodiment of the invention.
  • the reference numeral 11 in Fig. 1 denotes a single cylinder, four-cycle, four-valve engine provided on a motorcycle as a saddle type vehicle, the engine 11 comprising a cylinder head 16 fixed to an upper portion of a cylinder block (illustration of which is omitted), the cylinder head 16 mounting thereon a breather device 18, a decompression device 19, and a water pump device 20.
  • a camshaft 22 is rotatably provided on the cylinder head 16, the camshaft 22 being connected to a crank shaft (illustration of which is omitted) through a cam chain 23, which serves as a wrapping transmission belt, and the camshaft 22 being rotated through the cam chain 23 by virtue of rotation of the crank shaft.
  • the camshaft 22 is rotated whereby respective exhaust and intake valves 24, 25 are opened and closed in a predetermined timing.
  • the camshaft 22 is constructed such that a connection member 27 is fixed to a camshaft body 26 by means of a bolt 28 as shown in Fig. 1 and a latch member 29 is fitted between the camshaft body 26 and the connection member 27 to have the both rotating together.
  • the camshaft body 26 is formed with an intake cam portion 26a and an exhaust cam portion 26b, and rocker arms 30, 31 are brought into sliding contact with the cam portions 26a, 26b whereby the respective valves 24, 25 are opened and closed through the rocker arms 30, 31.
  • a sprocket 32 as a rotating member, around which the cam chain 23 is trained, is fixed to the connection member 27 of the camshaft 22, and a breather rotating body 33 of the breather device 18 is fixed to an outside of the sprocket 32 so that the breather rotating body 33 rotates together with rotation of the sprocket 32.
  • a substantially cylindrical-shaped annular portion 33a is projectingly formed on the breather rotating body 33, a breather stationary body 34 is provided outside the breather rotating body 33, and a tip end of an annular portion 34a of the breather stationary body 34 is inserted inside a tip end of the annular portion 33a of the breather rotating body 33 such that tip ends of the both annular portions 33a, 34a overlap each other to define a gap C between the annular portion 33a and the annular portion 34a.
  • the breather stationary body 34 is fixed to a partition 36, which partitions off a side of the breather device 18 and a side of the water pump device 20, and onto which a fitting groove 50c of an impeller shaft 50 is fitted and latched.
  • the partition 36 together with the breather stationary body 34 is mounted to a water-pump housing 41 to be sub-assembled to the water pump device 20.
  • the partition 36 is formed with a plurality of openings 36a so that gases separated in the breather device 18 go toward a gas chamber 37 on the side of the water pump device 20 and toward an air cleaner (illustration of which is omitted) through the openings 36a.
  • the gas-liquid mixture passes through the gap C whereby it expands when flowing into the breather device 18 from the gap C and a liquid of the gas-liquid mixture is separated from gases to adhere to an inner wall surface of the breather rotating body 33 due to centrifugal forces generated by rotation of the breather rotating body 33.
  • the liquid as adhered flows down through the gap C to an outside and then flows downward along an inner wall surface 39 of a chain chamber 38 to be returned to an oil pan (a lower portion of the casing) (illustration of which is omitted).
  • the gases separated in the breather device 18 go toward the gas chamber 37 on the side of the water pump device 20 through the openings 36a of the partition 36 as indicated by an arrow b. Since the gases further expand in the gas chamber 37 to be subjected to gas-liquid separation therein, the liquid accumulates on a bottom wall to flow downward along the inner wall surface 39 of the chain chamber 38 via a discharge hole 53 to be returned to an oil tank (illustration of which is omitted) as indicated by an arrow c.
  • the decompression device 19 is arranged in the breather device 18, which serves for gas-liquid separation.
  • the decompression device 19 serves to open the exhaust valve 25 a little in a compression stroke to release pressure, and is arranged inside the breather rotating body 33 of the breather device 18.
  • the decompression device 19 comprises a base side portion 43 constituting a part of a turning portion 42 and pivotally provided on the sprocket 32 through a turning shaft 45, the base side portion being biased clockwise in Fig. 3 by a spring 46.
  • a tip end side portion 44 is fixed to a tip end side of the base side portion 43 to constitute the turning portion 42.
  • a pair of actuation pins 44a are provided on a tip end of the tip end side portion 44 to project therefrom.
  • An outermost portion (the tip end side portion 44) of the decompression device 19 axially of the camshaft is positioned toward the sprocket 32 (inside) from a tip end of the annular portion 33a of the breather rotating body 33 axially of the camshaft.
  • a pushed pin 47a (one end) of a decompression cam 47 is inserted between and connected to the actuation pins 44a, 44a.
  • the decompression cam 47 comprises, as shown in Fig. 5 , a columnar-shaped cam body 47b, the pushed pin 47a projecting from the cam body 47b, and a semi-circular decompression-cam portion 47c formed at a tip end of the cam body 47b.
  • the cam body 47b of the decompression cam 47 is inserted into a through-hole 27a of the connection member 27 and an insertion hole 26c of the exhaust cam portion 26b of the camshaft body 26.
  • the decompression cam 47 is turned a predetermined angle whereby the decompression-cam portion 47c (the other end) having a semi-circular cross sectional shape projects and sinks from a surface of the exhaust cam portion 26b.
  • the bias of the spring 46 causes the turning portion 42 to turn to a position indicated by a solid line in Fig. 3 .
  • the decompression-cam portion 47c rotates to be put in a state, inwhichits semi-circular shape stands upright and decompression is effected.
  • the turning portion 42 since centrifugal forces of the turning portion 42 become large when the engine 11 revolves at high speed, the turning portion 42 turns counterclockwise against the bias of the spring 46 to a position indicated by a two-dot chain line from the position indicated by the solid line in Fig. 3 . Thereby, the pair of actuation pins 44a move the pushed pin 47a to turn the decompression cam 47, so that the decompression-cam portion 47c is caused to sink from the surface of the exhaust cam portion 26b. Thereby, there comes a state, in which decompression is released.
  • one end 50a of the impeller shaft 50 is connected to the bolt 28 and an impeller 52 is provided at the other end 50b of the impeller shaft 50 and accommodated in a pump chamber 51.
  • a pump-side cooling water passage extended from the pump chamber 51 is connected directly to a head-side cooling water passage formed in the cylinder head 16.
  • the impeller 52 revolves to draw a cooling water into the pump chamber 51 from a radiator side to supply the same to the head-side cooling water passage of the cylinder head 16 via the pump-side cooling water passage from the pump chamber 51.
  • the turning portion 42 of the decompression device 19 is arranged inside the annular portion 33a of the breather rotating body 33 of the breather device 18 whereby an axial width of the camshaft 22 can be made as short as possible.
  • a space, in which the decompression device 19 and the breather device 18 are arranged, can be made compact.
  • the decompression device 19 having an irregular shape rotates in the breather device 18, it is possible to improve the function of gas-liquid separation.
  • the decompression device 19 is arranged in the annular portion 33a of the breather rotating body 33, the turning portion 42 of the decompression device 19 abuts against the annular portion 33a prior to the provision of the spring 46 to enable the annular portion 33a to function as a stopper for the turning portion 42.
  • the decompression device 19 enables a drive force from the turning portion 42 of the decompression device 19, which is arranged in the breather device 18, to be surely transmitted to the exhaust cam portion 26b via the decompression cam 47.
  • the decompression device 19 since the outermost portion (the tip end side portion 44) of the decompression device 19 axially of the camshaft is positioned toward the sprocket 32 (inside) from the tip end of the annular portion 33a of the breather rotating body 33 axially of the camshaft, the decompression device 19 is completely accommodated in the breather rotating body 33, so that specifically in a state prior to mounting of the decompression device 19 to the sprocket 32, it is possible to perform the work of storage, mounting, or the like with the decompression device 19 accommodated in the breather rotating body 33, thus enabling protecting the decompression device 19.
  • the impeller shaft 50 of the water pump device 20 is detachably fitted into an end of the camshaft 22 on a side of the breather device 18 and the water pump device 20 is arranged outside and adjacent to the breather device 18, an axial width of the camshaft 22 can be made as short as possible even in a constitution, in which the water pump device 20 is arranged outside the breather device 18.
  • the partition 36 since the breather stationary body 34 of the breather device 18 is fixed to that partition 36, whichpartitions off the side of the breather device 18 and the side of the water pump device 20, and the impeller shaft 50 is fitted into and latched on the partition 36, the partition 36, to which the breather stationary body 34 of the breather device 18 is fixed, can efficiently prevent the impeller shaft 50 from coming off.
  • the embodiment applies the invention to the engine 11 for motorcycles, the invention is of course applicable to engines for other uses.
  • engines are not limited to single cylinder, four-valve ones but may be of other type.
  • the sprocket 32 is adopted as "rotating member", it is not limitative but it is possible to use a pulley in place of the sprocket 32 and a belt in place of the cam chain 23. Also, it is possible to adopt gears in place of the sprocket 32 so that a drive force from the crank shaft can be transmitted by means of a plurality of gears.
  • the decompression device is arranged inside the annular portion of the breather rotating body of the breather device to thereby enable making an axial width of the camshaft as short as possible, so that a space, in which the decompression device and the breather device are arranged, can be made compact.
  • the decompression device having an irregular shape rotates in the breather device, it is possible to improve the function of gas-liquid separation.
  • the decompression device is arranged in the annular portion of the breather rotating body, the turning portion of the decompression device abuts against the annular portion to enable the annular portion to function as a stopper for the turning portion.
  • the decompression device since one end of the decompression cam is connected to the turning portion and the other end of the decompression cam is extended to the exhaust cam portion, the decompression device enables a drive force from the turning portion of the decompression device arranged in the breather device to be surely transmitted to the exhaust cam portion via the decompression cam.
  • the decompression device since the outermost portion of the decompression device axially of the camshaft is positioned toward the rotating member from the tip end of the annular portion of the breather rotating body axially of the camshaft, the decompression device is completely accommodated in the breather rotating body, so that specifically in a state prior to mounting of the decompression device to the rotating member, it is possible to perform the work of storage, mounting, or the like with the decompression device accommodated in the breather rotating body, thus enabling protecting the decompression device.
  • an axial width of the camshaft can be made as short as possible even in a constitution, in which the water pump device is arranged outside the breather device.
  • the partition to which the breather stationary body of the breather device is fixed, can efficiently prevent the impeller shaft from coming off.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP04747366A 2003-07-10 2004-07-06 Engine Expired - Lifetime EP1655460B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2003195210 2003-07-10
JP2004080057 2004-03-19
PCT/JP2004/009898 WO2005005793A1 (ja) 2003-07-10 2004-07-06 エンジン

Publications (3)

Publication Number Publication Date
EP1655460A1 EP1655460A1 (en) 2006-05-10
EP1655460A4 EP1655460A4 (en) 2010-12-08
EP1655460B1 true EP1655460B1 (en) 2013-03-27

Family

ID=34067332

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04747366A Expired - Lifetime EP1655460B1 (en) 2003-07-10 2004-07-06 Engine

Country Status (4)

Country Link
EP (1) EP1655460B1 (ja)
JP (1) JP4197522B2 (ja)
ES (1) ES2402686T3 (ja)
WO (1) WO2005005793A1 (ja)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4887200B2 (ja) * 2006-08-08 2012-02-29 本田技研工業株式会社 デコンプ装置を備えたエンジン
JP4536697B2 (ja) * 2006-09-28 2010-09-01 本田技研工業株式会社 デコンプ装置付きカム機構
JP4884279B2 (ja) 2007-03-30 2012-02-29 本田技研工業株式会社 ブリーザ装置を備える内燃機関
JP5601135B2 (ja) * 2010-10-05 2014-10-08 スズキ株式会社 エンジンのデコンプ装置
DE102016008299B4 (de) * 2016-07-06 2020-12-31 Neander Motors Ag Ölabscheideeinrichtung für eine Brennkraftmaschine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10128465A1 (de) * 2001-06-12 2003-01-02 Mtu Friedrichshafen Gmbh Ölseparator zur Kurbelgehäuse-Entlüftung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02139306U (ja) * 1989-04-25 1990-11-21
JPH04153514A (ja) * 1990-10-17 1992-05-27 Toyota Autom Loom Works Ltd ブローバイガスのオイル分離装置
JPH04191408A (ja) * 1990-11-22 1992-07-09 Suzuki Motor Corp 四サイクルエンジンのオートデコンプ装置
JP3042635B2 (ja) * 1991-01-22 2000-05-15 ヤマハ発動機株式会社 自動二輪車のブリーザ装置
JPH04298617A (ja) * 1991-03-27 1992-10-22 Suzuki Motor Corp エンジンのデコンプ装置
JP4441069B2 (ja) * 2000-06-19 2010-03-31 本田技研工業株式会社 エンジンにおけるブリーザ構造
CA2431567A1 (en) * 2000-09-01 2002-03-07 Bombardier-Rotax Gmbh & Co. Kg Blow-by gas separator and decompressor for an internal combustion engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10128465A1 (de) * 2001-06-12 2003-01-02 Mtu Friedrichshafen Gmbh Ölseparator zur Kurbelgehäuse-Entlüftung

Also Published As

Publication number Publication date
EP1655460A1 (en) 2006-05-10
WO2005005793A1 (ja) 2005-01-20
JPWO2005005793A1 (ja) 2006-08-24
ES2402686T3 (es) 2013-05-07
EP1655460A4 (en) 2010-12-08
JP4197522B2 (ja) 2008-12-17

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