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
  • 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
  • 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 bearing block of a crankcase of a reciprocating internal combustion engine having the features of the preamble of patent claim 1.
• the object of the present invention is o. G. To avoid disadvantages.
• the ventilation bores are machined in the direction of the longitudinal axis of the crankcase (motor longitudinal axis) and thus prevent the occurrence of stress peaks (high internal stress due to notch effect), since in this case no sharp boundary geometry (sharp edges) due to the machining process of the tools arises.
• the ventilation hole is made in only a single operation in an advantageous manner, whereby the production-technical effort for the production of the ventilation hole bei-, is nearly halved.
• the processing is done with a 90 ° angle head with a milling cutter to minimize further stress as possible.
• the finished crankcase according to claim 3 corresponds to a conventional, but inventively produced crankcase.
• the crankcase according to the claims 4 and 5 have ventilation holes with an optimized flow cross-section.
• the crankcase according to claim 6 is a particularly preferred embodiment of the manufacturing method according to the invention.
• the method according to the invention is particularly suitable for crankcases whose cylinder surfaces have an LDS coating (arc wire spraying).
• the ventilation hole is designed such that the geometry of the ventilation opening is designed to be dimensionally stable and strength-optimized, and thus the deformation of the bearing block and in particular of the LDS layer is avoided.
• piston rings can be used with a lower piston ring preload, which lead to savings in fuel consumption due to the lower friction.
• Alloy cylinders are used in the crankcase, which guarantees a particularly low-friction operation. It replaces the liners, which usually provide a durable surface of the cylinder liner.
• Fig. 1 shows a section through an inventively produced
• crankcase 3 shows a section along a longitudinal axis of the crankcase (K) and a cylinder longitudinal axis (Z) through a crankcase 3 produced according to the invention.
• the crankcase 3 is shown by way of example for a four-cylinder internal combustion engine, but this is not meant to be limiting, since the invention Method can be used for any crankcase.
• the crankcase 3 has correspondingly four cylinders with cylinder surfaces 5, wherein between two adjacent cylinders in each case a bearing block 2 is arranged. In the second and in the fourth bearing chair 2, two ventilation holes 1 shown encircled are arranged.
• Each cylinder has a cylinder-longitudinal axis (Z) shown in phantom, the crankcase has a crankcase longitudinal axis (K) represented by a double-headed arrow.
• a lower piston dead center (UT) is shown in dashed lines.
• the inventive method for producing the ventilation hole 1 in the bearing block 2 of the crankcase 3 of a reciprocating internal combustion engine by milling with a cutter 4 shown schematically comprises the following method steps:
• the milling cutter 4 is moved in the direction of a plane perpendicular to the crankcase longitudinal axis (K) after the bearing block 2 has been broken through.
• this additional process step it is possible to represent ventilation holes 1 with a non-circular cross-section.
• a maximum flow cross section for the air can be displayed in an advantageous manner, whereby the flow losses significantly reduced and the rigidity of the bearing block and the cylinder surfaces 5 are increased.
• the ventilation hole 1 in the region of the lower piston dead center (UT) has a flattened cross-section. This makes it possible to bring the ventilation hole 1 closest possible to the lower piston dead center (UT) and to achieve an optimum flow cross-section.
• This is particularly preferably used when the cylinder surfaces 5 have an LDS coating (arc wire spraying). This embodiment allows advantageously to process only crankcase material and no raceway coating, as this is bad for the life of the tools due to the very hard LDS layer.
• the invention thus describes the design of a ventilation opening 1 in such a way that the geometry of the ventilation opening 1 is embodied in a shape-optimized and strength-optimized manner, and thus the deformation of the bearing block 2 and, at the same time, For example, the LDS layer can be avoided.
• piston rings can be used with a lower Koibenringvorschreib that lead to savings in fuel consumption due to the low friction.
• a 4-cylinder reciprocating internal combustion engine only the main bearings two and four are processed to get the least possible deformation. Processing of the main bearing 3 is not possible due to the higher forces.
• the processing is preferably carried out with a 90 ° angle head with end mill to minimize further stress as possible.
• the processing takes place in the direction of the crankcase longitudinal axis (K) and thereby prevents the development of stress peaks (high internal stress due to notch effect), since in this case no sharp waste geometry - as is known from the prior art - is created by the processing curve 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)

Priority Applications (5)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

Family

ID=44534263

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (3)

Citations (6)

Family Cites Families (18)

• 2010
  • 2010-10-01 DE DE102010041840A patent/DE102010041840A1/de not_active Withdrawn
• 2011
  • 2011-08-26 CN CN201180046681.XA patent/CN103124842B/zh active Active
  • 2011-08-26 JP JP2013530596A patent/JP2013538973A/ja active Pending
  • 2011-08-26 EP EP11749742.0A patent/EP2622197B1/de active Active
  • 2011-08-26 WO PCT/EP2011/004300 patent/WO2012041429A1/de not_active Ceased
• 2013
  • 2013-03-15 US US13/837,484 patent/US20130199507A1/en not_active Abandoned
• 2016
  • 2016-02-18 US US15/047,096 patent/US20160177869A1/en not_active Abandoned

Patent Citations (6)

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