US20130199507A1 - Method for Producing a Ventilation Bore in a Thrust Bearing of a Crankcase of a Reciprocating Internal Combustion Engine - Google Patents

Method for Producing a Ventilation Bore in a Thrust Bearing of a Crankcase of a Reciprocating Internal Combustion Engine Download PDF

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Publication number
US20130199507A1
US20130199507A1 US13/837,484 US201313837484A US2013199507A1 US 20130199507 A1 US20130199507 A1 US 20130199507A1 US 201313837484 A US201313837484 A US 201313837484A US 2013199507 A1 US2013199507 A1 US 2013199507A1
Authority
US
United States
Prior art keywords
crankcase
thrust bearing
milling cutter
longitudinal
ventilation bore
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
US13/837,484
Other languages
English (en)
Inventor
Lars TAENZER
Hans-Rainer KROENINGER
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Assigned to BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT reassignment BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KROENINGER, HANS-RAINER, TAENZER, LARS
Publication of US20130199507A1 publication Critical patent/US20130199507A1/en
Priority to US15/047,096 priority Critical patent/US20160177869A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0043—Arrangements of mechanical drive elements
    • F02F7/0053—Crankshaft bearings fitted in the crankcase
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/02—Milling surfaces of revolution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K3/00—Making engine or like machine parts not covered by sub-groups of B21K1/00; Making propellers or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/26—Making square or polygonal holes in workpieces, e.g. key holes in tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P13/00—Making metal objects by operations essentially involving machining but not covered by a single other subclass
    • 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
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0002—Cylinder arrangements
    • F02F7/0007—Crankcases of engines with cylinders in line
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2215/00—Details of workpieces
    • B23C2215/24—Components of internal combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2215/00—Details of workpieces
    • B23C2215/24—Components of internal combustion engines
    • B23C2215/242—Combustion chambers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2220/00—Details of milling processes
    • B23C2220/08—Milling with the axis of the tool perpendicular to the workpiece axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2220/00—Details of milling processes
    • B23C2220/48—Methods of milling not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2220/00—Details of milling processes
    • B23C2220/56—Plunge milling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49231—I.C. [internal combustion] engine making

Definitions

  • the invention relates to a method for producing a ventilation bore in a thrust bearing of a crankcase of a reciprocating internal-combustion engine.
  • the milling cutter is an angled-head milling cutter, which is inserted into the crankcase in the direction of a longitudinal cylinder axis, and is moved in the direction of a longitudinal crankcase axis until the thrust bearing has been perforated. Subsequently, the milling cutter is moved back in the direction of the longitudinal crankcase axis, and removed from the crankcase by moving the milling cutter in the direction of the longitudinal cylinder axis.
  • the machining of the ventilation bores takes place in the direction of the longitudinal axis of the crankcase (longitudinal axis of the engine) and thereby prevents the creation of stress peaks (high internal stress as a result of stress concentration), because, in this case, no acute cut-back geometry (pointed edges) is created as a result of the machining course of the tools.
  • the ventilation bore is advantageously produced in only one operation, whereby the production-related expenditures for the making of the ventilation bore are cut almost in half.
  • the machining takes place with a 90°-angled head by use of an end-milling cutter in order to, if possible, minimize further stress.
  • a finished crankcase produced according to the inventive method corresponds to a conventional crankcase and may have a ventilation bore with a circular cross-section.
  • a finished crankcase may also have ventilation bores with a non-circular cross-section, which ventilation bores may provide an optimized flow cross-section, such as a flattened cross-section in an area of a bottom dead center of the cylinder piston.
  • the method according to the invention is particularly suitable for crankcases whose cylinder running surfaces have an LDS coating (wire arc spraying).
  • the ventilation bore is particularly preferably further developed such that the geometry of the ventilation opening is constructed in a shape- and stability-optimized manner, and thereby the deformation of the thrust bearing and, particularly, of the LDS layer, will be avoided.
  • piston rings with lower piston ring prestressing can be used which, because of the lower friction, reduce fuel consumption.
  • FIG. 1 is a sectional view of an exemplary crankcase produced according to the invention.
  • FIG. 1 is a sectional view taken along a longitudinal axis (K) of the crankcase 3 and a longitudinal axis (Z) of a cylinder of the crankcase 3 produced according to the invention.
  • K longitudinal axis
  • Z longitudinal axis
  • the crankcase 3 for a four-cylinder internal-combustion engine is shown, which, however, should not represent a limitation because the method according to the invention can be used for any arbitrary crankcase.
  • the crankcase 3 has four cylinders with cylinder running surfaces 5 , one thrust bearing 2 respectively being arranged between two adjacent cylinders.
  • two ventilation bores 1 are arranged, which are indicated by a surrounding circle.
  • Each cylinder has a longitudinal cylinder axis (Z) indicated by a dash-dotted line; the crankcase 3 has a longitudinal crankcase axis (K) indicated by a double arrow.
  • a bottom dead center (UT) of the piston is indicated by a broken line.
  • the method for producing the ventilation bore 1 in the thrust bearing 2 of the crankcase 3 of a reciprocating internal-combustion engine by milling with a schematically illustrated milling cutter 4 has the following process steps:
  • the milling cutter 4 after the thrust bearing 2 has been perforated, is moved in the direction of a plane perpendicular to the longitudinal axis (K) of the crankcase.
  • this additional process step it becomes possible to produce ventilation bores 1 with a noncircular cross-section.
  • a maximal flow cross-section for the air can be represented, whereby the flow losses are clearly reduced, and the rigidities of the thrust bearing and of the cylinder running surfaces 5 are increased.
  • the ventilation bore 1 has a flattened cross-section in the area of the bottom dead center (UT) of the piston. It thereby becomes possible to move the ventilation bore as closely as possible to the bottom dead center (UT) of the piston and to achieve an optimal flow cross-section.
  • This is particularly preferably used when the cylinder running surface 5 has an LDS coating (wire arc spraying).
  • LDS coating wire arc spraying
  • the invention therefore describes the further development of a ventilation opening 1 such that the geometry of the ventilation opening 1 has a shape- and stability-optimized construction, and the deformation of the thrust bearing 2 and, for example, the LDS layer can thereby be avoided.
  • piston rings with lower piston ring prestressing can be used, which reduce fuel consumption because of the low friction.
  • only the main bearings two and four are machined in order to obtain a deformation that is as low as possible. Because of the higher forces, the main bearing 2 cannot be machined.
  • the machining preferably takes place with a 90°-angled head by use of an end-milling cutter, in order to minimize further stress, if possible.
  • the processing takes place in the direction of the longitudinal crankcase axis (K) and thereby prevents the occurrence of stress peaks (high internal stress concentration), since, in this case, no acute cut-back geometry—as known from the state of the art—is created by the machining course of the tools.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
US13/837,484 2010-10-01 2013-03-15 Method for Producing a Ventilation Bore in a Thrust Bearing of a Crankcase of a Reciprocating Internal Combustion Engine Abandoned US20130199507A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/047,096 US20160177869A1 (en) 2010-10-01 2016-02-18 Method for Producing a Ventilation Bore in a Thrust Bearing of a Crankcase of a Reciprocating Internal Combustion Engine

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102010041840A DE102010041840A1 (de) 2010-10-01 2010-10-01 Verfahren zur Herstellung einer Ventilationsbohrung in einem Lagerstuhl eines Kurbelgehäuses einer Hubkolben-Brennkraftmaschine
DE102010041840.4 2010-10-01
PCT/EP2011/004300 WO2012041429A1 (de) 2010-10-01 2011-08-26 Verfahren zur herstellung einer ventilationsbohrung in einem lagerstuhl eines kurbelgehäuses einer hubkolben-brennkraftmaschine

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/004300 Continuation WO2012041429A1 (de) 2010-10-01 2011-08-26 Verfahren zur herstellung einer ventilationsbohrung in einem lagerstuhl eines kurbelgehäuses einer hubkolben-brennkraftmaschine

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US15/047,096 Continuation US20160177869A1 (en) 2010-10-01 2016-02-18 Method for Producing a Ventilation Bore in a Thrust Bearing of a Crankcase of a Reciprocating Internal Combustion Engine

Publications (1)

Publication Number Publication Date
US20130199507A1 true US20130199507A1 (en) 2013-08-08

Family

ID=44534263

Family Applications (2)

Application Number Title Priority Date Filing Date
US13/837,484 Abandoned US20130199507A1 (en) 2010-10-01 2013-03-15 Method for Producing a Ventilation Bore in a Thrust Bearing of a Crankcase of a Reciprocating Internal Combustion Engine
US15/047,096 Abandoned US20160177869A1 (en) 2010-10-01 2016-02-18 Method for Producing a Ventilation Bore in a Thrust Bearing of a Crankcase of a Reciprocating Internal Combustion Engine

Family Applications After (1)

Application Number Title Priority Date Filing Date
US15/047,096 Abandoned US20160177869A1 (en) 2010-10-01 2016-02-18 Method for Producing a Ventilation Bore in a Thrust Bearing of a Crankcase of a Reciprocating Internal Combustion Engine

Country Status (6)

Country Link
US (2) US20130199507A1 (zh)
EP (1) EP2622197B1 (zh)
JP (1) JP2013538973A (zh)
CN (1) CN103124842B (zh)
DE (1) DE102010041840A1 (zh)
WO (1) WO2012041429A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130025124A1 (en) * 2011-07-27 2013-01-31 Grob-Werke Gmbh & Co. Kg Method and Machining Installation for the Finishing of a Crankshaft Bearing Bore

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103464817B (zh) * 2013-09-17 2015-11-11 中北大学 弧形方孔切削加工装置及加工弧形方孔的方法
FR3024954B1 (fr) * 2014-08-19 2017-03-03 Peugeot Citroen Automobiles Sa Procede d'usinage de palier de bute laterale pour arbre a cames dans une culasse par fraisage hemispherique
US10792737B1 (en) 2019-03-18 2020-10-06 Caterpillar Inc. Cutting machine and method

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US3542000A (en) * 1969-05-22 1970-11-24 Brunswick Corp Two cycle engine ports and method of making the same
US5481084A (en) * 1991-03-18 1996-01-02 Aluminum Company Of America Method for treating a surface such as a metal surface and producing products embodying such including lithoplate
US6022175A (en) * 1997-08-27 2000-02-08 Kennametal Inc. Elongate rotary tool comprising a cermet having a Co-Ni-Fe binder
US6062928A (en) * 1997-08-14 2000-05-16 Sanshin Kogyo Kabushiki Kaisha Crankcase ventillation system for four cycle outboard motor
US20030079344A1 (en) * 2001-09-14 2003-05-01 Kioritz Corporation Cylinder and method for manufacturing a cylinder for an internal combustion engine
US20040062619A1 (en) * 2002-08-16 2004-04-01 Ruko Gmbh Prazisionswerkzeuge Multiple-stage drilling tool
US20040107571A1 (en) * 2002-11-30 2004-06-10 Martin Leiendecker Arrangement for forming control windows in a cylinder wall
US20050045121A1 (en) * 2003-08-27 2005-03-03 Yuichi Kawamoto Multicylinder four-cycle combustion engine
US20050166396A1 (en) * 2002-09-19 2005-08-04 Klaus Brockel Method for making a cylinder
US20050214082A1 (en) * 2004-03-23 2005-09-29 Dasch Jean M Lubricants in cutting tools for dry machining
US20060026830A1 (en) * 2004-08-06 2006-02-09 Jens Boehm Process for the fluid blasting of cylinder bearing surfaces which are subsequently to be thermally coated
US7415958B2 (en) * 2004-08-06 2008-08-26 Daimler Ag Process for processing cylinder crankcases having sprayed cylinder barrels
US20090013982A1 (en) * 2007-06-28 2009-01-15 Tsuneyoshi Yuasa Two-cycle engine cylinder and method for manufacturing the same
US20090087275A1 (en) * 2005-08-02 2009-04-02 David Goulbourne Twist drill
US7584735B2 (en) * 2004-08-06 2009-09-08 Daimler Ag Process for the chip-forming machining of thermally sprayed cylinder barrels
DE102008058583A1 (de) * 2008-11-22 2010-05-27 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verfahren zum Bearbeiten einer Gehäusewandung eines Kurbelgehäuses zwecks Herstellung einer Ventilationsöffnung
US20120063860A1 (en) * 2009-06-11 2012-03-15 Tungaloy Corporation Drilling Tool

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US5080056A (en) * 1991-05-17 1992-01-14 General Motors Corporation Thermally sprayed aluminum-bronze coatings on aluminum engine bores
US5820938A (en) * 1997-03-31 1998-10-13 Ford Global Technologies, Inc. Coating parent bore metal of engine blocks
JP3420566B2 (ja) * 2000-12-04 2003-06-23 本田技研工業株式会社 Ｖ型多気筒エンジン
EP1392262A1 (en) * 2001-05-24 2004-03-03 Alexza Molecular Delivery Corporation Delivery of drug esters through an inhalation route
JP4640262B2 (ja) * 2006-05-31 2011-03-02 日産自動車株式会社 多気筒エンジンのクランクケース
DE102006028801B4 (de) 2006-06-23 2017-10-12 Bayerische Motoren Werke Aktiengesellschaft Kurbelgehäuse mit einer Ventilationsbohrung

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3542000A (en) * 1969-05-22 1970-11-24 Brunswick Corp Two cycle engine ports and method of making the same
US5481084A (en) * 1991-03-18 1996-01-02 Aluminum Company Of America Method for treating a surface such as a metal surface and producing products embodying such including lithoplate
US6062928A (en) * 1997-08-14 2000-05-16 Sanshin Kogyo Kabushiki Kaisha Crankcase ventillation system for four cycle outboard motor
US6022175A (en) * 1997-08-27 2000-02-08 Kennametal Inc. Elongate rotary tool comprising a cermet having a Co-Ni-Fe binder
US20030079344A1 (en) * 2001-09-14 2003-05-01 Kioritz Corporation Cylinder and method for manufacturing a cylinder for an internal combustion engine
US6729274B2 (en) * 2001-09-14 2004-05-04 Kioritz Corporation Cylinder and method for manufacturing a cylinder for an internal combustion engine
US20040062619A1 (en) * 2002-08-16 2004-04-01 Ruko Gmbh Prazisionswerkzeuge Multiple-stage drilling tool
US20050166396A1 (en) * 2002-09-19 2005-08-04 Klaus Brockel Method for making a cylinder
US7159314B2 (en) * 2002-09-19 2007-01-09 Andreas Stihl Ag & Co. Kg Method for making a cylinder
US20040107571A1 (en) * 2002-11-30 2004-06-10 Martin Leiendecker Arrangement for forming control windows in a cylinder wall
US7096843B2 (en) * 2003-08-27 2006-08-29 Kawasaki Jukogyo Kabushiki Kaisha Multicylinder four-cycle combustion engine
US20050045121A1 (en) * 2003-08-27 2005-03-03 Yuichi Kawamoto Multicylinder four-cycle combustion engine
US20050214082A1 (en) * 2004-03-23 2005-09-29 Dasch Jean M Lubricants in cutting tools for dry machining
US20060026830A1 (en) * 2004-08-06 2006-02-09 Jens Boehm Process for the fluid blasting of cylinder bearing surfaces which are subsequently to be thermally coated
US7415958B2 (en) * 2004-08-06 2008-08-26 Daimler Ag Process for processing cylinder crankcases having sprayed cylinder barrels
US7584735B2 (en) * 2004-08-06 2009-09-08 Daimler Ag Process for the chip-forming machining of thermally sprayed cylinder barrels
US20090087275A1 (en) * 2005-08-02 2009-04-02 David Goulbourne Twist drill
US20090013982A1 (en) * 2007-06-28 2009-01-15 Tsuneyoshi Yuasa Two-cycle engine cylinder and method for manufacturing the same
DE102008058583A1 (de) * 2008-11-22 2010-05-27 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verfahren zum Bearbeiten einer Gehäusewandung eines Kurbelgehäuses zwecks Herstellung einer Ventilationsöffnung
US20120063860A1 (en) * 2009-06-11 2012-03-15 Tungaloy Corporation Drilling Tool

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130025124A1 (en) * 2011-07-27 2013-01-31 Grob-Werke Gmbh & Co. Kg Method and Machining Installation for the Finishing of a Crankshaft Bearing Bore
US8925198B2 (en) * 2011-07-27 2015-01-06 Nagel Maschinen-Und Werkzeugfabrik Gmbh Method and machining installation for the finishing of a crankshaft bearing bore

Also Published As

Publication number Publication date
DE102010041840A1 (de) 2012-04-05
CN103124842A (zh) 2013-05-29
JP2013538973A (ja) 2013-10-17
EP2622197A1 (de) 2013-08-07
CN103124842B (zh) 2016-04-06
EP2622197B1 (de) 2019-01-23
US20160177869A1 (en) 2016-06-23
WO2012041429A1 (de) 2012-04-05

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AS Assignment

Owner name: BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT, GERMA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TAENZER, LARS;KROENINGER, HANS-RAINER;REEL/FRAME:030295/0096

Effective date: 20130416

STCB Information on status: application discontinuation

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