US20090078080A1 - Connecting Rod for an Internal Combustion Engine and Method for Its Production - Google Patents

Connecting Rod for an Internal Combustion Engine and Method for Its Production Download PDF

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Publication number
US20090078080A1
US20090078080A1 US12/086,738 US8673806A US2009078080A1 US 20090078080 A1 US20090078080 A1 US 20090078080A1 US 8673806 A US8673806 A US 8673806A US 2009078080 A1 US2009078080 A1 US 2009078080A1
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United States
Prior art keywords
connecting rod
coating
bore
rod eye
solid lubricant
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Abandoned
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US12/086,738
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English (en)
Inventor
Peter Kemnitz
Klaus Keller
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Mahle International GmbH
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Mahle International GmbH
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Assigned to MAHLE INTERNATIONAL GMBH reassignment MAHLE INTERNATIONAL GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KEMNITZ, PETER, KELLER, KLAUS
Publication of US20090078080A1 publication Critical patent/US20090078080A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
    • F16C33/1045—Details of supply of the liquid to the bearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/40—Distributing applied liquids or other fluent materials by members moving relatively to surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0218—Pretreatment, e.g. heating the substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
    • F16C23/02—Sliding-contact bearings
    • F16C23/04—Sliding-contact bearings self-adjusting
    • F16C23/041—Sliding-contact bearings self-adjusting with edge relief
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
    • F16C33/106—Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid
    • F16C33/1065—Grooves on a bearing surface for distributing or collecting the liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • F16C33/208—Methods of manufacture, e.g. shaping, applying coatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C9/00—Bearings for crankshafts or connecting-rods; Attachment of connecting-rods
    • F16C9/04—Connecting-rod bearings; Attachments thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/10—Connection to driving members
    • F16J1/14—Connection to driving members with connecting-rods, i.e. pivotal connections
    • F16J1/16—Connection to driving members with connecting-rods, i.e. pivotal connections with gudgeon-pin; Gudgeon-pins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J7/00—Piston-rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/26—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2223/00—Surface treatments; Hardening; Coating
    • F16C2223/30—Coating surfaces
    • F16C2223/42—Coating surfaces by spraying the coating material, e.g. plasma spraying
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F16C2360/22—Internal combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
    • F16C33/103—Construction relative to lubrication with liquid, e.g. oil, as lubricant retained in or near the bearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • F16C33/201—Composition of the plastic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
    • F16C7/02—Constructions of connecting-rods with constant length
    • F16C7/023—Constructions of connecting-rods with constant length for piston engines, pumps or the like
    • 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
    • Y10T29/49288—Connecting rod making
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2142—Pitmans and connecting rods
    • Y10T74/2162—Engine type

Definitions

  • the present invention relates to a connecting rod for an internal combustion engine, having a small connecting rod eye for accommodating a piston pin, and a large connecting rod eye for accommodating a crank journal, whereby at least one connecting rod eye has at least one geometric deviation from a cylindrical inside contour.
  • the present invention furthermore relates to a method for the production of such a connecting rod.
  • the connecting rod connects the piston of an internal combustion engine with the crankshaft.
  • the small connecting rod eye accommodates the piston pin, while the large connecting rod eye surrounds a crank journal.
  • the small and the large connecting rod eye are provided with slide bearing surfaces, for example in the form of slide bearing layers.
  • the slide bearing surfaces of these components are subject to very great mechanical stress.
  • the piston pin can bend as a result of the tremendous forces that act on the piston during the oscillating movement of the piston.
  • the connecting pin eyes are subject to great stress. Therefore, ways are being sought to relieve stress on the connecting rod eyes. This is done, for example, by means of local geometric changes in the usually cylindrical connecting rod eye, which reduce the mechanical stress.
  • Such geometric changes can be, for example, stress relief pockets, oval, conical or spherical bores. This principle is already known for pin boss bores, see, for example, WO 96/07841 A1. Such geometric changes have been produced by means of complicated precision machining of the connecting rod eyes until now.
  • Connecting rods having connecting rod eyes with slide bearing surfaces are known from the German patent application 10 2004 059 490.2.
  • the slide bearing surfaces are coated with a self-lubricating coating made of a resin with solid lubricant particles embedded in it.
  • the solution consists in a connecting rod having the characteristics of claim 1 and a method having the characteristics of claim 12 .
  • at least one connecting rod eye is formed from a bore having a cylindrical inside contour, that the bore is provided with a coating comprising a resin with solid lubricant particles embedded in it, and that the coating forms the at least one geometric deviation from the cylindrical inside contour of the connecting rod eye.
  • the method according to the invention is characterized in that first, a bore having a cylindrical inside contour is produced, and subsequently, a coating agent comprising a resin with solid lubricant particles embedded in it is applied to the inside surface of this bore, by means of a coating tool, so that the resulting coating forms the at least one geometric deviation from the cylindrical inside contour of the at least one connecting rod eye.
  • connecting rod eyes having at least one geometric deviation from the cylindrical inside contour, and having a self-lubricating coating of their inside surfaces, in one and the same work step.
  • the complicated and very complex cutting machining of the metallic inside surfaces of the connecting rod eyes for the purpose of introducing the at least one geometric deviation is eliminated.
  • bearing bushings or bearing shells are no longer necessary to achieve sufficient lubrication and an anti-seizure effect of the connecting rod eyes. Coating can take place without prior application of an adhesion layer.
  • the desired dimensional accuracy of the coating rod eyes is reliably achieved.
  • the strength and therefore the useful lifetime of the bearing of piston pin and/or crank journal are significantly improved, as a result of the improved lubrication properties as compared with the previously known coatings made of metal alloys.
  • the at least one geometric deviation can be configured as at least one stress-relief pocket and/or ovality (for example as a heightwise or crosswise ovality) and/or as a shaped bore, as it is disclosed in WO 96/07841 A1 for pin bores, for example.
  • At least one oil collection chamber can be provided in the coating, in order to further improve the lubrication of the bearing.
  • the at least one oil collection chamber can be configured as a channel that runs in the direction of the longitudinal axis, as a channel that runs radially with regard to the longitudinal axis, surrounding it entirely or in part, and/or as a pocket-shaped recess.
  • the minimum thickness of the coating depends on the requirements of the individual case and can amount to 5 ⁇ m to 15 ⁇ m, for example.
  • the resin contained in the coating is a thermally cured resin, particularly a polyamide resin, which is very temperature-resistant and can withstand the stresses that the bearing is subject to in operation particularly well.
  • the solid lubricant particles can particularly consist of a material that is selected from the materials group that comprises graphite, molybdenum sulfide, tungsten disulfide, hexagonal boron nitride, and PTFE (polytetrafluoroethylene).
  • the solid lubricant particles consist of only one material.
  • the solid lubricant particles consist of the same material, or if solid lubricant particles that consist of two different materials are mixed, for example solid lubricant particles of graphite with solid lubricant particles of a metal sulfide.
  • the solid lubricant particles have a particle size of 1 ⁇ m to 3 ⁇ m.
  • the at least one geometric deviation can be configured by means of varying the amount of the coating agent given off by the coating tool and/or by means of varying the advance of the coating tool in the bore to be coated.
  • a possible alternative consists in applying the coating agent in a uniform thickness and configuring the at least one geometric deviation by means of subsequent working of the resulting coating.
  • this is significantly more complicated than making the at least one geometric deviation directly during the coating process.
  • the result namely a connecting rod having connecting rod eyes whose coating forms the at least one geometric deviation from the cylindrical inside contour of the connecting rod eyes, is the same.
  • the coating agent is applied to inside surfaces of the bores with a surface roughness of Ra (average roughness value) ⁇ 0.8 ⁇ m, in order to achieve particularly good adhesion.
  • the inside surfaces of the bores can be pre-heated before and/or during application of the coating agent, preferably up to a temperature of 50° C. to 80° C.
  • the coating agent can be applied by means of rotation atomization from a rotating nozzle introduced into the bore, for example.
  • rotation atomization from a rotating nozzle introduced into the bore, for example.
  • a preferred further development of the method according to the invention consists in using a thermally curing coating agent and subjecting same to heat treatment immediately after completing the application, preferably at a temperature of 200° C.
  • FIG. 1 a front view of an embodiment of a connecting rod according to the invention
  • FIG. 2 a section along the line II-II in FIG. 1 ;
  • FIG. 3 a schematic representation of a coating tool.
  • FIGS. 1 and 2 show an exemplary embodiment of a connecting rod 10 according to the invention.
  • the connecting rod 10 consists, in known manner, of steel, for example.
  • the connecting rod 10 has a connecting rod shaft 11 , a small connecting rod eye 20 , and a large connecting rod eye 30 .
  • the small connecting rod eye 20 accommodates the piston pin of a piston (not shown), while the large connecting rod eye 30 accommodates a crank journal of a crankshaft (not shown).
  • the connecting rod eyes 20 , 30 are shaped bores having a defined inside contour 21 , 31 that deviates from the cylinder shape, as it is disclosed, for example, in WO 96/07841 A1.
  • This configuration serves to relieve stress on the mechanical system of piston pin, connecting rod 10 , and crank journal, during operation, in order to avoid the risk of cracks around the connecting rod eyes 20 , 30 .
  • Other configurations of a connecting rod eyes that serve the same purpose are, for example, bores provided with ovality (heightwise and/or crosswise) or with stress relief pockets (not shown). These configurations are already known for pin bores.
  • the two connecting rod eyes 20 , 30 are configured, according to the invention, in such a manner that they are composed of a cylindrical bore 22 and 32 , respectively, and a coating 23 and 33 , respectively.
  • the surface contour of the coating 23 or 33 is structured in such a manner that the desired inside contour 21 and 31 , respectively, of the connecting rod eye 20 and 30 , respectively, which deviates from the cylinder shape, is obtained.
  • ovality or a stress relief pocket can also be formed by the surface structure of the coating 23 or 33 (not shown).
  • the coating 23 or 33 essentially consists of a resin with solid lubricant particles embedded in it, and is thus a self-lubricating coating.
  • the coating 23 or 33 is furthermore provided with oil collection chambers in the form of a channel 24 or 34 that extends in the direction of the longitudinal axis L of the connecting rod eye 20 or 30 , in each instance, from which channel pockets 25 and 35 , respectively, extend radially.
  • oil collection chambers serve to further improve the lubrication of the bearing of piston pin or crank journal, respectively, in each instance.
  • they can be configured for any desired application, in any desired shape and size, and can be disposed relative to one another in any desired form.
  • the cylindrical bore 22 or 32 is made in the connecting rod shaft 11 , and mechanically finished in known manner.
  • the surface roughness Ra (average roughness value) can correspond to the one indicated in DE 41 11 368 A1, whereby in general, the Ra values amount to 0.63 ⁇ m or less for bore diameters of less than 30 mm, and Ra values of 0.8 ⁇ m or less are achieved for bore diameters between 30 mm and 60 mm.
  • the bore diameter is selected, before coating, in such a manner that the piston pin or the crank journal, respectively, has a diametral play of 10 ⁇ m to 40 ⁇ m in the finished connecting rod eye 20 or 30 , respectively.
  • the cylindrical bore 22 or 32 should be cleaned in such a manner that chips, other particles, machining oils and the like are completely removed.
  • the inside surface of the cylindrical bore 22 or 32 can also be phosphatized.
  • cover templates are affixed in the cylindrical bore 22 or 32 before coating takes place, in known manner.
  • the cover templates prevent coating of the covered regions of the cylindrical bore 22 or 32 .
  • the finished coating 23 or 33 can subsequently be worked, and can be provided with oil collection chambers in this way.
  • the coating agent selected in the exemplary embodiment is formed from a thermally curable resin with solid lubricant particles of one or more of the materials graphite, molybdenum sulfide, tungsten disulfide, hexagonal boron nitride, and PTFE embedded in it.
  • the resin is a very temperature-resistant polyamide imide
  • the solid lubricant is a mixture of molybdenum sulfide and graphite particles having a particle size of 1 ⁇ m to 3 ⁇ m.
  • the amount of the solid lubricant is selected in such a manner that the finished coating contains about 50 to 60 wt.-% solid lubricant particles.
  • the viscosity of the coating agent is adjusted in such a manner that droplet formation is prevented in the case of sufficient application.
  • a device 40 for rotation atomization serves to apply the coating to the inside surface of the cylindrical bore 22 or 32 , in the exemplary embodiment.
  • the device 40 has a base body 41 that is connected with a nozzle body 42 .
  • the nozzle body 42 is mounted to rotate on the base body, by means of a bearing 43 .
  • the nozzle body 42 is with a nozzle 44 having an exit opening 45 .
  • the base body 41 possesses feed channels 46 , 47 , in each instance, which are intended for the liquid coating material and for compressed air, and end in a mixing chamber 48 for mixing and metering.
  • An exit channel 49 extends from the mixing chamber 48 , through the nozzle body 42 , and opens into the exit opening 45 .
  • a baffle plate 51 is disposed perpendicular to the exit opening 45 , so that a ring-shaped gap 52 having a width of 0.5 mm in the exemplary embodiment is formed between the baffle plate 51 and the nozzle body 42 .
  • the coating agent/air mixture exits through the gap 52 , in the form of a spray jet 53 , radially and at a distance from the nozzle body 42 .
  • the nozzle body 42 is put into rotation by means of a drive 54 , and rotates in the speed of rotation range from 14,000 to 18,000 rotations per minute in the exemplary embodiment.
  • the coating agent/air mixture that exits from the exit opening 45 is accelerated by the centripetal forces that occur at the exit opening 45 , in such a manner that it exits radially as a disk-shaped spray jet 53 . Since the spray jet 53 is configured narrow in the direction of the longitudinal axis L, the inside surface of the cylindrical bore 22 or 32 that is to be coated can be sharply delimited, in the direction of the longitudinal axis L, by means of simple feed control of the coating agent/air mixture.
  • nozzles 44 having a diameter in the range between 5 and 25 mm and having depths up to 50 mm are available, so that it is possible to coat cylindrical bores 22 , 32 for connecting rods of all engine types with the device 40 .
  • the diameter of the nozzle 44 is generally selected in such a manner that it approximately corresponds to half the diameter of the cylindrical bore 22 or 32 .
  • a centrifuge device S-520 from Sprimag in Kirchheim is also suitable for carrying out the coating method.
  • application of the coating agent/air mixture takes place onto the inside surface of the cylindrical bore 22 and/or 32 , which has been pre-heated to 50° C. to 80° C.
  • the nozzle 44 is introduced centrally into the cylindrical bore 22 or 32 , from the outside to the inside.
  • the advance of the nozzle 44 is varied in a range of 10 to 20 mm/s, for example.
  • the amount of the coating agent/air mixture exiting from the exit opening 45 of the nozzle 44 can be varied.
  • the device 40 works with computer control.
  • cover templates are provided in the cylindrical bore 22 or 32 to produce oil collection chambers, the feed of the coating agent/air mixture is shut off when such a template is reached, so that residues of the spray jet are sprayed onto the cover template. When the end of the cover template has been reached, the feed of the coating agent/air mixture is achieved again.
  • the coating agent When the coating agent has been applied, it is thermally hardened, in that the connecting rod, i.e. the connecting rod component that has the coated connecting rod eyes 20 and/or 30 , is placed in an oven and held at a temperature of 200° C. between 10 and 20 minutes there, in the exemplary embodiment.
  • the finished coating 23 or 33 is approximately 5 ⁇ m to 20 ⁇ m thick at its thinnest point, and the diametral pin play of the piston pin or crank journal amounts to about 10 ⁇ m to 20 ⁇ m. This close play is particularly advantageous for avoiding noise development.
  • the coating 23 or 33 furthermore guarantees that despite the close play, no seizing occurs.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Manufacturing & Machinery (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Sliding-Contact Bearings (AREA)
US12/086,738 2005-12-21 2006-12-15 Connecting Rod for an Internal Combustion Engine and Method for Its Production Abandoned US20090078080A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE102005061062.5 2005-12-21
DE102005061062 2005-12-21
DE102006013399.4 2006-03-23
DE102006013399A DE102006013399A1 (de) 2005-12-21 2006-03-23 Pleuel für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
PCT/DE2006/002258 WO2007073720A1 (de) 2005-12-21 2006-12-15 Pleuel für einen verbrennungsmotor und verfahren zu seiner herstellung

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2006/002258 A-371-Of-International WO2007073720A1 (de) 2005-12-21 2006-12-15 Pleuel für einen verbrennungsmotor und verfahren zu seiner herstellung

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US14/250,463 Division US9726223B2 (en) 2005-12-21 2014-04-11 Method for the production of a connecting rod for an internal combustion engine

Publications (1)

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US20090078080A1 true US20090078080A1 (en) 2009-03-26

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US12/086,738 Abandoned US20090078080A1 (en) 2005-12-21 2006-12-15 Connecting Rod for an Internal Combustion Engine and Method for Its Production
US14/250,463 Expired - Fee Related US9726223B2 (en) 2005-12-21 2014-04-11 Method for the production of a connecting rod for an internal combustion engine

Family Applications After (1)

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US14/250,463 Expired - Fee Related US9726223B2 (en) 2005-12-21 2014-04-11 Method for the production of a connecting rod for an internal combustion engine

Country Status (6)

Country Link
US (2) US20090078080A1 (ja)
EP (1) EP1963692A1 (ja)
JP (1) JP5260306B2 (ja)
BR (1) BRPI0620382A2 (ja)
DE (1) DE102006013399A1 (ja)
WO (1) WO2007073720A1 (ja)

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US20090165743A1 (en) * 2005-12-21 2009-07-02 Peter Kemnitz Piston for an Internal Combustion Engine and Method for Its Production
US20100050432A1 (en) * 2006-09-15 2010-03-04 Thyssenkrupp Technologies Ag Method for producing a connecting rod
US20120066888A1 (en) * 2009-03-16 2012-03-22 Alfing Kessler Sondermaschinen Gmbh Method for joining two components of a unit
US20130091980A1 (en) * 2011-10-17 2013-04-18 David Domanchuk Thermal spray coating for connecting rod small end
US8870462B2 (en) 2010-02-11 2014-10-28 Mahle International Gmbh Bearing bush
WO2014202610A3 (en) * 2013-06-17 2015-05-07 Mahle International Gmbh Connecting rod with bearing-less large end
AU2015204340A1 (en) * 2014-09-26 2016-04-14 Honda Motor Co., Ltd. Connecting rod for internal combustion engine
US9599148B2 (en) 2011-10-17 2017-03-21 Mahle International Gmbh Thermal spray coating for connecting rod small end
US9714677B2 (en) * 2014-01-24 2017-07-25 Ford Global Technologies, Llc Coated connecting rod and method of making the same
US9835200B2 (en) * 2015-04-15 2017-12-05 Siemens Energy, Inc. Generator bearing assembly and a method for lubricating a generator bearing assembly
US10054162B2 (en) 2015-02-27 2018-08-21 Taiho Kogyo Co., Ltd. Sliding bearing

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US8613137B2 (en) 2004-11-16 2013-12-24 Mahle International Gmbh Connecting rod lubrication recess
US8424445B2 (en) 2009-06-02 2013-04-23 Mahle International Gmbh Connecting rod bore
US8245687B2 (en) 2010-01-07 2012-08-21 Mahle International Gmbh Profiled connecting rod bore with micro-dimples
FR2983867B1 (fr) * 2011-12-09 2014-08-22 Total Raffinage Marketing Lubrifiant moteur pour vehicules a motorisation hybride ou micro-hybride
JP5910438B2 (ja) * 2012-09-28 2016-04-27 大豊工業株式会社 半割りスラスト軸受
EP2998594A1 (en) * 2014-09-19 2016-03-23 ThyssenKrupp Metalúrgica Campo Limpo Ltda. Connecting rod
JP5916829B1 (ja) * 2014-10-28 2016-05-11 ヤマハ発動機株式会社 コンロッド、内燃機関、自動車両およびコンロッドの製造方法
JP6090303B2 (ja) * 2014-12-24 2017-03-08 マツダ株式会社 エンジン
DE102015202631B4 (de) * 2015-02-13 2018-02-15 Schaeffler Technologies AG & Co. KG Lager und Verfahren
EP3093514A1 (de) * 2015-05-12 2016-11-16 Siemens Aktiengesellschaft Radialgleitlager mit versetzten schmiertaschen
DE102015217111A1 (de) * 2015-09-08 2017-03-09 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Lagern eines ersten Bauteils an einem zweiten Bauteil eines Kraftfahrzeugs
EP3587844A1 (en) 2018-06-21 2020-01-01 ThyssenKrupp Metalúrgica Campo Limpo Ltda. Connecting rod
WO2022269122A1 (en) * 2021-06-24 2022-12-29 Wärtsilä Finland Oy Bearing element, lubrication arrangement and piston engine

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8181623B2 (en) 2005-12-21 2012-05-22 Mahle International Gmbh Piston for an internal combustion engine
US20090165743A1 (en) * 2005-12-21 2009-07-02 Peter Kemnitz Piston for an Internal Combustion Engine and Method for Its Production
US20100050432A1 (en) * 2006-09-15 2010-03-04 Thyssenkrupp Technologies Ag Method for producing a connecting rod
US8234785B2 (en) * 2006-09-15 2012-08-07 Thyssenkrupp Technologies Ag Method for producing a connecting rod
US20120066888A1 (en) * 2009-03-16 2012-03-22 Alfing Kessler Sondermaschinen Gmbh Method for joining two components of a unit
US8870462B2 (en) 2010-02-11 2014-10-28 Mahle International Gmbh Bearing bush
US8893580B2 (en) * 2011-10-17 2014-11-25 Mahle International Gmbh Thermal spray coating for connecting rod small end
CN104126076A (zh) * 2011-10-17 2014-10-29 马勒国际公司 用于连杆小端的热喷涂层
US20130091980A1 (en) * 2011-10-17 2013-04-18 David Domanchuk Thermal spray coating for connecting rod small end
US9599148B2 (en) 2011-10-17 2017-03-21 Mahle International Gmbh Thermal spray coating for connecting rod small end
WO2014202610A3 (en) * 2013-06-17 2015-05-07 Mahle International Gmbh Connecting rod with bearing-less large end
US9714677B2 (en) * 2014-01-24 2017-07-25 Ford Global Technologies, Llc Coated connecting rod and method of making the same
RU2669540C2 (ru) * 2014-01-24 2018-10-11 ФОРД ГЛОУБАЛ ТЕКНОЛОДЖИЗ, ЭлЭлСи Шатун с покрытием, узел двигателя и способ нанесения покрытия на шатун
AU2015204340A1 (en) * 2014-09-26 2016-04-14 Honda Motor Co., Ltd. Connecting rod for internal combustion engine
AU2015204340B2 (en) * 2014-09-26 2016-11-17 Honda Motor Co., Ltd. Connecting rod for internal combustion engine
US10054162B2 (en) 2015-02-27 2018-08-21 Taiho Kogyo Co., Ltd. Sliding bearing
US9835200B2 (en) * 2015-04-15 2017-12-05 Siemens Energy, Inc. Generator bearing assembly and a method for lubricating a generator bearing assembly

Also Published As

Publication number Publication date
JP5260306B2 (ja) 2013-08-14
US9726223B2 (en) 2017-08-08
US20140242277A1 (en) 2014-08-28
WO2007073720A1 (de) 2007-07-05
JP2009520926A (ja) 2009-05-28
BRPI0620382A2 (pt) 2011-11-08
EP1963692A1 (de) 2008-09-03
DE102006013399A1 (de) 2007-07-05

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