EP0377829A2 - Nockenwellenschmierungsanlage für Brennkraftmaschinen - Google Patents

Nockenwellenschmierungsanlage für Brennkraftmaschinen Download PDF

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Publication number
EP0377829A2
EP0377829A2 EP89122720A EP89122720A EP0377829A2 EP 0377829 A2 EP0377829 A2 EP 0377829A2 EP 89122720 A EP89122720 A EP 89122720A EP 89122720 A EP89122720 A EP 89122720A EP 0377829 A2 EP0377829 A2 EP 0377829A2
Authority
EP
European Patent Office
Prior art keywords
cylinder head
camshafts
lubricant
camshaft
set forth
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
EP89122720A
Other languages
English (en)
French (fr)
Other versions
EP0377829B1 (de
EP0377829B2 (de
EP0377829A3 (en
Inventor
Yoshiaki Sugiura
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=18028248&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0377829(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Publication of EP0377829A2 publication Critical patent/EP0377829A2/de
Publication of EP0377829A3 publication Critical patent/EP0377829A3/en
Publication of EP0377829B1 publication Critical patent/EP0377829B1/de
Application granted granted Critical
Publication of EP0377829B2 publication Critical patent/EP0377829B2/de
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
    • 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
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • 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
    • F01M9/106—Oil reservoirs
    • 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
    • F01L2001/0476—Camshaft bearings
    • 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
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F01M2005/008—Lubrication means facilitating engine starting
    • 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

  • This invention relates to a camshaft lubricating system for an engine and more particularly to an improved arrangement for insuring that the camshafts and valve train of an internal combustion engine will be lubricated immediately upon starting of the engine.
  • lubrication system for the valve train, particularly with overhead valve overhead camshaft type engines.
  • the lubricant is supplied to the bearings and cam lobes and tappets through a pressure system that delivers the oil to the cam bearings or camshaft frequently through hollow internal passages in the camshaft. Because of the remote location, these components can be subject to high wear on initial start up when the oil has all drained from the cylinder head during long periods of inactivity.
  • This invention is adapted to be embodied in a cylinder head arrangement for an internal combustion engine having first and second camshafts journaled for rotation relative to the cylinder head for operating poppet valves reciprocating in the cylinder head.
  • Means are provided for delivering lubricant to the cylinder head for lubricating the camshafts.
  • means are provided for forming a lubricant dam to trap and retain a volume of lubricant in contact with the camshaft and at least partially submerging the camshaft when the means for delivering lubricant ceases to deliver lubricant due to stopping of the engine.
  • an internal combustion engine constructed in accordance with an embodiment of the invention is shown partially and is identified generally by the reference numeral 11. Since the invention deals primarily with the valve train and lubricating system for it, only this portion of the engine has been illustrated. The remaining components of the engine may be considered to be conventional or those which are well known to those skilled in the art.
  • the engine 11 includes a cylinder block 12 that has one or more cylinder bore 13.
  • the cylinder block 12 is disposed so that the cylinder bores 13 are inclined to the vertical as in conjunction with a slanted engine or one cylinder bank of a V type engine.
  • the invention has particular utility in conjunction with engines wherein the cylinder bores are so oriented.
  • the invention may also be employed in conjunction with engines having vertically aligned cylinder bores, as will become apparent to those skilled in the art.
  • the engine 11 is slanted toward the front of an associated vehicle as indicated by the arrow Fr.
  • Pistons 14 are slidably supported within the cylinder bores 13 and are connected by means of connecting rods (not shown) to a camshaft in a well known manner.
  • a cylinder head assembly indicated generally by the reference numeral 15 is affixed to the cylinder block 12 in any known manner and is formed with individual recesses 16 that cooperate with each of the cylinder bores 13 and pistons 14 to form a combustion chamber of any desired configuration.
  • the cylinder head assembly 15 includes a main cylinder head casting 17 in which the recesses 16 are formed and which slidably support a plurality of intake valves 18. In the illustrated embodiment, there are provided three intake valves per cylinder bore 13. In addition, on generally the opposite side of the cylinder head 17 there are slidably supported two exhaust valves 19.
  • the intake valve 18 and exhaust valves 19 may be disposed in an orientation as shown and described in United States Letters Patent 4,660,529, entitled “Four Cycle Engine", issued April 28, 1987 in the name of Masaaki Yoshikawa and assigned to the Assignee of this application. It is to be understood, however, that the invention may be employed with engines having other numbers of intake and exhaust valves per cylinder.
  • the intake valves 18 have valve stems 21 that are slidably supported in guides 22 that are pressed into the cylinder head casting 17 and which control the flow of an intake charge from a suitable charge former (not shown) through one or more intake passageways 23 into the combustion chamber formed by the recess 16.
  • the exhaust valves 19 have stem portions 24 that are slidably supported within guides 25 and which control the discharge of exhaust gases from the combustion chamber 16 to the atmosphere through exhaust ports 25 and an appropriate exhaust system (not shown).
  • the intake valves 18 are each surrounded by coil compression springs 26 that act against the cylinder head casting 17 and a keeper retainer assembly 27 for urging the intake valves 18 to their closed position.
  • the intake valves 18 are opened by means of an actuating mechanism, to be described, which includes thimble tappets 28 that are slidably supported within bores 29 formed in the cylinder head casting 17 and which cooperate with the tips of the valve stems 21 in a known manner.
  • the exhaust valves 19 are urged to their closed position by means of coil compression springs 31 that encircle their stems 24 and which act against keeper retained assemblies 32 and the cylinder head casting 17 for urging the exhaust valves 19 to their closed positions.
  • Thimble tappets 33 are slidably supported in bores 34 formed in the cylinder head casting 17 for opening the exhaust valves 19 in a manner which will be described.
  • An intake camshaft 35 is supported within the cylinder head assembly 15 and has individual cam lobes 36, 37 and 38 which cooperate with the respective thimble tappets 28 associated with each of the intake valves 21 of the respective cylinder bore 13.
  • Bearing surfaces are formed on the intake camshaft 35 between the cam lobes 36, 37 and 38 and bearing assemblies 39 and 41 cooperate with these bearing surfaces so as to rotatably journal the intake camshaft 35 in the cylinder head assembly 15.
  • the bearing assemblies 39 and 41 are formed respectively by bearing surfaces 42 and 43 formed integrally with the cylinder head casting 17 and with bearing caps 44 and 45 that are affixed to the cylinder head casting 17 by means of studs 46 and nuts 47.
  • oil passages may be formed in the cylinder head for delivering oil to the interior of the camshaft 35 where it is delivered to the bearing assemblies 39 and 41 through cross drilled holes for lubrication of these bearing assemblies.
  • the lubricant will flow to lubricate the cam lobes, 36, 37 and 38 in a manner to be described.
  • the cylinder head casting 17 is provided with a construction for forming an oil well 48 and associated with the cam lobes 36, 37 and 38 of each cylinder.
  • These wells 48 are formed by means of upstanding walls 49 formed integrally with the cylinder head casting 17 and which cooperate with a wall 51 formed by the bearing caps 44 and 45 so that the bearing caps 44 and 45 and wall 51 form a unitary assembly.
  • Lubricant will fill within the wells 48 to a level indicated by the line 52 when the engine is running so as to trap lubricant in the area of the cam lobes 36, 37 and 38 and tappets 28 for their lubrication.
  • This oil is delivered from leakage from the bearing assemblies 39 and 41 and will accumulate during engine running, as aforenoted. Additional oil supplied during running will drain over the top of the walls 51 and can be returned back to the lubricant sump through the normal return drains in the cylinder head 17 (not shown)>
  • cam lobes 36, 37 and 38 rotate through an arc indicated by the line 53 in Figure 1 which will successively immerse and remove the cam lobes 36, 37 and 38 from this lubricant.
  • the wells 48 will trap lubricant. This trapped lubricant will insure lubrication of not only the cam lobes 36, 37 and 38 and tappets 28 on start up, but also the bearing surfaces of the camshaft since it should be readily apparent that they also are immersed.
  • An exhaust camshaft is journaled within the cylinder head assembly 15 in a manner to be described and has pairs of cam lobes 55 and 56 that cooperate with the thimble tappets 33 associated with the exhaust valves 19 for opening these exhaust valves.
  • the exhaust camshaft 54 is journaled by individual bearing assemblies, indicated generally by the reference numeral 57 which cooperate with bearing surfaces formed between the individual cam lobes 55 and 56.
  • These bearing assemblies include a bearing surface 58 formed integrally by the cylinder head casting 17 and a bearing cap 59 that is affixed to the cylinder head casting 17 by means of studs 61 and nuts 62.
  • the studs 61 and nuts 62 are made of a larger diameter than the studs 46 and nuts 47 associated with the intake camshaft 35 so as to insure good hold down relationship.
  • valve assembly now described is contained within a cam tower recess 63 formed by the cylinder head assembly and which is closed by means of a cam cover 64 that is affixed to the cylinder head casting 17 in a known manner.
  • the inclined configuration of the cylinder head assembly 15 also forms a well 65 that is in proximity to the bearings 59 and cam lobes 55 and 56 and in which lubricant which is delivered to the camshaft bearing surfaces through the bearing assembly 59 can accumulate to a level shown by the line 66 in Figure 1. Therefore, like the wells associated with the intake camshaft tappets and bearing surfaces, lubricant will accumulate during running and also will be maintained in this area when the engine is shut down so as to insure immediate lubrication when the engine is restarted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
EP19890122720 1988-12-09 1989-12-08 Nockenwellenschmierungsanlage für Brennkraftmaschinen Expired - Lifetime EP0377829B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP63312355A JP2911463B2 (ja) 1988-12-09 1988-12-09 動弁機構の潤滑構造
JP312355/88 1988-12-09

Publications (4)

Publication Number Publication Date
EP0377829A2 true EP0377829A2 (de) 1990-07-18
EP0377829A3 EP0377829A3 (en) 1990-08-16
EP0377829B1 EP0377829B1 (de) 1992-07-22
EP0377829B2 EP0377829B2 (de) 1998-03-11

Family

ID=18028248

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890122720 Expired - Lifetime EP0377829B2 (de) 1988-12-09 1989-12-08 Nockenwellenschmierungsanlage für Brennkraftmaschinen

Country Status (3)

Country Link
EP (1) EP0377829B2 (de)
JP (1) JP2911463B2 (de)
DE (1) DE68902226T3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0821144A1 (de) * 1996-07-26 1998-01-28 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Zylinderkopfanordnung einer Brennkraftmaschine
WO2015104499A1 (fr) 2014-01-13 2015-07-16 Rdmo Moteur a explosion comportant des augets de graissage des cames
US10309563B2 (en) 2013-11-12 2019-06-04 Bayerische Motoren Werke Aktiengesellschaft Drive unit, internal combustion engine, spacer element for a fluid line arrangement, and tool kit for mounting a spacer element

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2546615Y2 (ja) * 1990-12-28 1997-09-03 富士重工業株式会社 Ｄｏｈｃエンジンのカム潤滑装置
JP4355633B2 (ja) * 2004-08-23 2009-11-04 株式会社クボタ 頭上弁エンジン
JP5135052B2 (ja) * 2008-05-08 2013-01-30 ヤマハ発動機株式会社 エンジン及びスクータ型自動二輪車

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2737901C2 (de) * 1977-08-23 1983-01-05 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart Gehäuse für eine Nockenwelle einer Brennkraftmaschine für Kraftfahrzeuge
US4329949A (en) * 1980-06-30 1982-05-18 Ford Motor Company Cylinder head for an internal-combustion engine
US4660529A (en) * 1981-04-22 1987-04-28 Yamaha Hatsudoki Kabushiki Kaisha Four-cycle engine
JPS62105314U (de) * 1985-12-21 1987-07-04
JP2527312B2 (ja) * 1986-10-03 1996-08-21 ヤマハ発動機株式会社 Ｖ形エンジンのシリンダブロツク構造

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0821144A1 (de) * 1996-07-26 1998-01-28 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Zylinderkopfanordnung einer Brennkraftmaschine
US10309563B2 (en) 2013-11-12 2019-06-04 Bayerische Motoren Werke Aktiengesellschaft Drive unit, internal combustion engine, spacer element for a fluid line arrangement, and tool kit for mounting a spacer element
WO2015104499A1 (fr) 2014-01-13 2015-07-16 Rdmo Moteur a explosion comportant des augets de graissage des cames
FR3016409A1 (fr) * 2014-01-13 2015-07-17 Rdmo Moteur a explosion comprenant des augets de graissage des cames
CN106030055A (zh) * 2014-01-13 2016-10-12 Rdmo公司 包括凸轮润滑槽的内燃机

Also Published As

Publication number Publication date
EP0377829B1 (de) 1992-07-22
DE68902226T2 (de) 1992-12-10
JPH02157408A (ja) 1990-06-18
DE68902226D1 (de) 1992-08-27
EP0377829B2 (de) 1998-03-11
EP0377829A3 (en) 1990-08-16
JP2911463B2 (ja) 1999-06-23
DE68902226T3 (de) 1998-06-10

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