EP1403497A1 - Nockenwellenlagerstruktur für eine Brennkraftmaschine mit oben liegenden Nockenwellen - Google Patents

Nockenwellenlagerstruktur für eine Brennkraftmaschine mit oben liegenden Nockenwellen Download PDF

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Publication number
EP1403497A1
EP1403497A1 EP20030020860 EP03020860A EP1403497A1 EP 1403497 A1 EP1403497 A1 EP 1403497A1 EP 20030020860 EP20030020860 EP 20030020860 EP 03020860 A EP03020860 A EP 03020860A EP 1403497 A1 EP1403497 A1 EP 1403497A1
Authority
EP
European Patent Office
Prior art keywords
camshaft
cam chain
internal combustion
combustion engine
type internal
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
EP20030020860
Other languages
English (en)
French (fr)
Other versions
EP1403497B1 (de
Inventor
Koji Terada
Hirotaka Haze
Eiko Shiozaki
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
Publication of EP1403497A1 publication Critical patent/EP1403497A1/de
Application granted granted Critical
Publication of EP1403497B1 publication Critical patent/EP1403497B1/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/022—Chain drive
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F01L1/0532—Camshafts overhead type the cams being directly in contact with the driven valve
    • 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
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • 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
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • F01M9/102—Lubrication of valve gear or auxiliaries of camshaft bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/26—Cylinder heads having cooling means
    • F02F1/36—Cylinder heads having cooling means for liquid cooling
    • F02F1/38—Cylinder heads having cooling means for liquid cooling the cylinder heads being of overhead valve type
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F01L2001/0537—Double overhead camshafts [DOHC]
    • 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
    • F01M1/00—Pressure lubrication
    • F01M1/06—Lubricating systems characterised by the provision therein of crankshafts or connecting rods with lubricant passageways, e.g. bores
    • F01M2001/064—Camshaft with passageways
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]

Definitions

  • the present invention relates to bearing structure of a camshaft for an overhead camshaft (OHC) type internal combustion engine.
  • OOC overhead camshaft
  • Patent Literature 1
  • the present invention has been achieved in views of the above-described points, and is aimed to provide camshaft bearing structure for an overhead camshaft type internal combustion engine capable of easily securing the rigidity of the camshaft and preventing beating noise from occurring.
  • camshaft bearing structure for a multi-cylinder overhead camshaft type internal combustion engine, in which on a covered surface of a cylinder head, an intake camshaft and an exhaust camshaft are arranged in parallel with each other, each journal portion is axially supported, disposed and is covered with a head cover, characterized in that substantially at the centers of the intake camshaft and the exhaust camshaft respectively, there are provided cam chain sprockets; adjacent to the cam chain sprocket, bearing portions are formed respectively on the covered surface of the cylinder head; and between each of the bearing portions and each bracket, each journal portion to which the intake camshaft and the exhaust camshaft correspond is axially supported so as to be sandwiched.
  • bearing portions for axially supporting the intake camshaft and the exhaust camshaft respectively are formed adjacent to each cam chain sprocket, even if tension due to a cam chain to be wound around each cam chain sprocket is exerted on the intake camshaft and the exhaust camshaft as a bending force, it is possible to easily secure rigidity of the intake camshaft and the exhaust camshaft.
  • camshaft bearing structure for an overhead camshaft type internal combustion engine specified in Claim 2 characterized in that adj acent to each of the cam chain sprockets, each bearing portion to be formed on a covered surface of the cylinder head is formed only at one side of each of the cam chain sprockets.
  • the bearing portion is formed only at one side of the cam chain sprocket, since the bearing portion is adjacent to the cam chain sprocket, the rigidity of the camshaft can be sufficiently secured.
  • camshaft bearing structure for an overhead camshaft type internal combustion engine specified in Claim 2 or Claim 3, characterized in that the intake camshaft and the exhaust camshaft have cams, each of which directly acts on the intake valve and the exhaust valve respectively.
  • each cam directly acts on the intake valve and the exhaust valve respectively, it is possible to reduce a number of parts and simplify the structure without necessitating any rocker arm.
  • camshaft bearing structure for an overhead camshaft type internal combustion engine specified in Claim 4, characterized in that in the intake camshaft and the exhaust camshaft, there is formed an oil passage therein; oil is introduced from an introducing oil path formed on the bearing portion adjacent to the cam chain sprocket of the cylinder head to the oil passage; and oil is conducted from an conducting oil path formed in each cam lobe and the journal portion.
  • An internal combustion engine 1 is a parallel four-cylinder four-stroke cycle DOHC (Double Overhead Camshaft) type internal combustion engine, and is mounted on a motorcycle transversely.
  • DOHC Double Overhead Camshaft
  • Fig. 1 is a partially longitudinal cross-sectional view showing the internal combustion engine 1, and a cross-sectional view taken on line I-I of Fig. 2; and Fig. 2 is a top view showing a state in which the cylinder head cover has been removed.
  • a piston 4 is fitted in each cylinder bore 3 in such a manner as to be freely slidable.
  • combustion chambers 6 On a cylinder head 5 to be integrally superimposed on the cylinder block 2, there are formed combustion chambers 6 to oppose to each piston 4 respectively, and on the surface of a ceiling of each combustion chamber 6, there are opened a pair of intake ports and a pair of exhaust ports side by side with each other.
  • a valve stem 9a, 10a of an intake valve 9 for opening and closing an opening of an intake port 7 and an exhaust valve 10 for opening and closing an opening of an exhaust port 8 is slidably supported by a valve guide 11, 12 respectively, and between a retainer 13, 14 to be provided at a top end of the valve stem 9a, 10a, and the cylinder head 5, there is interposed a valve spring 15, 16 to bias the intake valve 9 and the exhaust valve 10 in a direction that closes the valve.
  • valve stem 9a, 10a The upper part of the valve stem 9a, 10a is covered with a valve lifter 17, 18 having a bottom and a cylindrical shape, and the end surface of this valve lifter 17, 18 is directly urged by cam lobes 23, 24 of the intake camshaft 21 and the exhaust camshaft 22.
  • the present internal combustion engine is a DOHC type internal combustion engine, and the intake camshaft 21 and the exhaust camshaft 22 are arranged in parallel with each other on a covered surface of the cylinder head 5 and are disposed with each journal portion 25, 26 axially supported, and their upper parts are covered with a cylinder head cover 19.
  • the intake camshaft 21 and the exhaust camshaft 22 are of a center cam chain type, at the substantially central part of which a cam chain sprocket 27, 28 is fitted to.
  • a cylinder head 5 which is rectangular when the top view is viewed as shown in Fig. 4 has, at its central part, a cam chain chamber 30 which has been formed as a rectangular hole in a continuous length in the direction of width.
  • this cam chain chamber 30 On both sides of this cam chain chamber 30, there are disposed two each of combustion chambers 6 for each cylinder, and at the center of each combustion chamber 6, there is formed a plug hole 31 for mounting an ignition plug respectively.
  • abearing portion 34, 35 having a semi-circular arc surface
  • mating surface 36, 37 with the bracket respectively
  • bolt hole 36a, 37a there is provided
  • boss portions 38, 39 for head bolt on both sides of a pair of intake-side lifter holes 32, 32 for each cylinder and on both sides of a pair of exhaust-side lifter holes 33, 33, there are formed boss portions 38, 39 for head bolt.
  • a bearing portion 41, 42 forming a semi-circular arc surface so as to bulge out somewhat further in the cam chain chamber 30 from a boss portion 38, 39 is formed to become coaxial to the bearing portion 34, 35 respectively.
  • the intake camshaft 21 and the exhaust camshaft 22 fit and insert a cam chain sprocket 27, 28 into a cam chain chamber 30 respectively to cause each bearing portion 34, 35 and bearing portion 41, 42 to support a journal portion 25, 26, and brackets 45, 46 andbrackets 51, 52, eachhaving a semi-circular arc surface corresponding to each bearing portion sandwich the journal portion 25, 26 therebetween to axially support the intake camshaft 21 and the exhaust camshaft 22 pivotally (See Figs. 2 and 3).
  • brackets 45, 46 and brackets 51, 52 are fixed by means of bolts 53.
  • a cam lobe 23, 24 of the intake camshaft 21 and the exhaust camshaft 22 abuts against the end surface of a valve lifter 17, 18 which is slidably fitted in the lifter hole 32, 33.
  • oil passes through an oil path 51a (See Fig. 2) formed on a bracket 51 from an introducing oil path 43b opened on a mating surface 43 of the bearing portion 41 adjacent to the cam chain sprocket 27, is introduced into an oil passage 21a of the intake camshaft 21 through an introducing oil path 21b of a journal portion corresponding, and is conducted from a conducting oil path 23a formed on each cam lobe 23 and a conducting oil path 25a formed on a journal portion 25 to supply oil to the cam outer peripheral surface and the bearing for lubrication.
  • oil is introduced from the introducing oil path 43b of the bearing portion 41 located at substantially center of the intake camshaft 21 to the oil passage 21a of the intake camshaft 21, oil is evenly supplied to both sides of left and right.
  • valve system on the exhaust side is also lubricated with similar structure.
  • the present invention has been applied to the DOHC type internal combustion engine, but is capable of being also applied to a SOHC (Single Overhead Camshaft) type internal combustion engine, and is applicable to not only multi-cylinder, but also a single cylinder internal combustion engine.
  • SOHC Single Overhead Camshaft
  • Camshaft bearing structure for an overhead camshaft type internal combustion engine in which on a covered surface of the cylinder head 5, a camshaft 21 is axially supported, disposed and is covered with a head cover, characterized in that the camshaft 21 is provided with a cam chain sprocket 27, adjacent to the cam chain sprocket 27, there is formed a bearing portion 41 on a covered surface of the cylinder head 5, and a journal portion 25 to which the camshaft 21 corresponds is axially

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP03020860A 2002-09-30 2003-09-15 Nockenwellenlagerstruktur für eine Brennkraftmaschine mit oben liegenden Nockenwellen Expired - Fee Related EP1403497B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002287251 2002-09-30
JP2002287251A JP4017488B2 (ja) 2002-09-30 2002-09-30 頭上カム軸式内燃機関のカム軸軸受構造

Publications (2)

Publication Number Publication Date
EP1403497A1 true EP1403497A1 (de) 2004-03-31
EP1403497B1 EP1403497B1 (de) 2007-10-31

Family

ID=31973438

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03020860A Expired - Fee Related EP1403497B1 (de) 2002-09-30 2003-09-15 Nockenwellenlagerstruktur für eine Brennkraftmaschine mit oben liegenden Nockenwellen

Country Status (3)

Country Link
EP (1) EP1403497B1 (de)
JP (1) JP4017488B2 (de)
DE (1) DE60317150T2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2034141A1 (de) 2007-09-05 2009-03-11 Mazda Motor Corporation Schmierungsvorrichtung, damit ausgerüsteter Motor und Schmierungsverfahren
CN102140948A (zh) * 2011-03-29 2011-08-03 奇瑞汽车股份有限公司 一种可变气门升程汽车发动机偏心轴
CN104061032A (zh) * 2013-03-22 2014-09-24 马勒国际有限公司 内燃机的支承架或气缸盖罩
CN105370334A (zh) * 2015-11-23 2016-03-02 重庆祥吉机械制造有限公司 一种新型凸轮轴结构

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1946786A1 (de) 2007-01-19 2008-07-23 Coloplast A/S Spülsystem mit Pumpe
CN101922320A (zh) * 2010-09-29 2010-12-22 奇瑞汽车股份有限公司 一种汽车发动机凸轮轴
CN105351032A (zh) * 2015-11-18 2016-02-24 重庆小康工业集团股份有限公司 凸轮轴润滑系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4630580A (en) * 1984-09-14 1986-12-23 Suzuki Motor Co., Ltd. Oil passage usable for an engine
US4632073A (en) * 1984-05-16 1986-12-30 Yamaha Hatsudoki Kabushiki Kaisha Camshaft mounting mechanism for DOHC engine of motorcyle
US4658769A (en) * 1985-04-17 1987-04-21 Toyota Jidosha Kabushiki Kaisha V-type internal combustion engine with centrally located drive gears coupling double overhead camshafts
EP0322572A1 (de) * 1987-12-28 1989-07-05 Yamaha Hatsudoki Kabushiki Kaisha Ventilsteuervorrichtung für Mehrventil-Brennkraftmaschine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3859046B2 (ja) * 1998-12-29 2006-12-20 スズキ株式会社 内燃機関のオイル通路
US6024063A (en) * 1999-06-14 2000-02-15 Ford Global Technologies, Inc. Camshaft lash adjustment process and system for internal combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4632073A (en) * 1984-05-16 1986-12-30 Yamaha Hatsudoki Kabushiki Kaisha Camshaft mounting mechanism for DOHC engine of motorcyle
US4630580A (en) * 1984-09-14 1986-12-23 Suzuki Motor Co., Ltd. Oil passage usable for an engine
US4658769A (en) * 1985-04-17 1987-04-21 Toyota Jidosha Kabushiki Kaisha V-type internal combustion engine with centrally located drive gears coupling double overhead camshafts
EP0322572A1 (de) * 1987-12-28 1989-07-05 Yamaha Hatsudoki Kabushiki Kaisha Ventilsteuervorrichtung für Mehrventil-Brennkraftmaschine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2034141A1 (de) 2007-09-05 2009-03-11 Mazda Motor Corporation Schmierungsvorrichtung, damit ausgerüsteter Motor und Schmierungsverfahren
US7926458B2 (en) 2007-09-05 2011-04-19 Mazda Motor Corporation Lubricating device
CN101382080B (zh) * 2007-09-05 2012-05-23 马自达汽车株式会社 润滑装置
CN102140948A (zh) * 2011-03-29 2011-08-03 奇瑞汽车股份有限公司 一种可变气门升程汽车发动机偏心轴
CN104061032A (zh) * 2013-03-22 2014-09-24 马勒国际有限公司 内燃机的支承架或气缸盖罩
CN104061032B (zh) * 2013-03-22 2017-10-24 马勒国际有限公司 内燃机的支承架或气缸盖罩
CN105370334A (zh) * 2015-11-23 2016-03-02 重庆祥吉机械制造有限公司 一种新型凸轮轴结构
CN105370334B (zh) * 2015-11-23 2018-01-16 重庆祥吉机械制造有限公司 一种凸轮轴结构

Also Published As

Publication number Publication date
EP1403497B1 (de) 2007-10-31
DE60317150D1 (de) 2007-12-13
DE60317150T2 (de) 2008-02-21
JP2004124746A (ja) 2004-04-22
JP4017488B2 (ja) 2007-12-05

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