WO2008107041A1 - Géométrie d'un alésage d'une bielle d'un moteur à combustion interne - Google Patents

Géométrie d'un alésage d'une bielle d'un moteur à combustion interne Download PDF

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Publication number
WO2008107041A1
WO2008107041A1 PCT/EP2008/000397 EP2008000397W WO2008107041A1 WO 2008107041 A1 WO2008107041 A1 WO 2008107041A1 EP 2008000397 W EP2008000397 W EP 2008000397W WO 2008107041 A1 WO2008107041 A1 WO 2008107041A1
Authority
WO
WIPO (PCT)
Prior art keywords
bore
connecting rod
piston
pin
geometry
Prior art date
Application number
PCT/EP2008/000397
Other languages
German (de)
English (en)
Inventor
Hartmut Kamp
Original Assignee
Ks Kolbenschmidt Gmbh
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 Ks Kolbenschmidt Gmbh filed Critical Ks Kolbenschmidt Gmbh
Priority to EP08707131A priority Critical patent/EP2142813A1/fr
Publication of WO2008107041A1 publication Critical patent/WO2008107041A1/fr

Links

Classifications

    • 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
    • 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
    • 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

Definitions

  • the invention relates to a connecting rod with a connecting rod bore according to the features of the preamble of patent claim 1.
  • Pistons with piston stems for an internal combustion engine wherein a pin bore is introduced into the piston skirt as a shaped bore, are basically known. Due to the stresses of the pin bore inner surfaces in which the bolt which connects the piston to the connecting rod is subjected to extremely high loads during operation due to deformations of the bolt during the movement of the piston. To compensate for the deformation of the pin bore (hub bore), it is known in the prior art (for example DE 21 52 462 A1, DE 30 36 062 C2, DE 41 41 279 C2, DE 44 41 450 A1 or DE 102 31 233 A1), along the generatrix of the pin bore segment - or sections - interpret this hub bore oval, circular or cylindrical. As a result, however, the transition from one section of one mold to the other section of another shape results in transitions forming a step which disadvantageously results in additional loading of the hub bore and pin located therein.
  • the invention is therefore based on the object to provide a formed as a shaped bore connecting rod bore of a connecting rod, which avoids the disadvantages described above, that is, with a higher load on the entire system, consisting of piston and connecting rod, can be achieved and acting on the system Forces are reduced.
  • the connecting rod bore has a widening and the widening in the axial direction in the direction of the piston hubs, above a bore axis of the pin bore, relative to a piston stroke axis (in the assembled system consisting of piston, piston pin and connecting rod) is smaller than the widening below the bore axis (or vice versa).
  • this special expansion of the connecting rod bore not only takes into account the deformation of the piston pin, but also the deformation of the connecting rod itself during operation in the internal combustion engine, which was previously disregarded in the prior art. Because of these deformations of both the connecting rod and the piston pin in operation, which are different above and below the pin axis, the invention now allows these loads of the piston pin evenly on the bearing surfaces on the connecting rod bore (especially in the zenith and in the areas around it , relative to the piston stroke axis) and thus to reduce the total load of the system of pin bore and bolt and connecting rod. Thus, a total of a higher load on the entire system can be achieved because with the invention, the deformation of the piston pin is adapted to the deformation of the connecting rod itself (or its connecting rod bore) in the load case.
  • the generatrices of the connecting rod bore are round or oval. Due to these freedoms in the bore geometry over the axial extension, a further adaptation to the deformation of the connecting rod and piston pin in the event of loading can take place.
  • the widening of the connecting rod bore is formed trumpet-shaped in the direction of the connecting rod outer region.
  • the transition from a section having a first shaping to the next section having a different shape is designed to run.
  • the invention achieves in an advantageous manner that the previously known sectional shape of the pin bore is dissolved in the running during processing transitions, for example, from circular to cylindrical, from circular to oval, from cylindrical to oval, from oval to circular, from oval is created with a first radius to an oval shape with a different radius and the like.
  • the list just given is only an example and not restrictive.
  • advantageously in the respective geometry over the bore circumference transition shape different radii so that the longitudinal axes of the respective sections are designed with their particular shape both perpendicular and parallel to the piston axis with over the circumference of different expansion.
  • a particular embodiment of the invention provides that, starting from the zenith of the pin bore in the direction of a combustion chamber of the engine facing the region of the piston, the generatrix with over the axial extent and the circumference of the pin bore elliptical with varying radii are formed.
  • the shape (geometry) of the pin bore can have an oval, circular (cylindrical) and again oval geometry steplessly with freely selected orientation and length of the ovality axes.
  • the choice of the orientation and length of the ovality axes depends on the geometries of the piston, in particular the axial extent and the diameter of the bolt and in particular on the diameter and the piston height of the piston.
  • the invention provides an optimized, i. the deformation forces adapted shaping of the pin bore to minimize the friction in the pin hub while ensuring the lubrication of the piston pin over the entire lateral surface.
  • the invention makes it possible to lubricate the piston crown over the entire lateral surface, which was not possible in the previous embodiments according to the prior art.
  • the inventive design of the geometry of the pin bore leads to a reduction of the risk of breakage of piston or piston pin, a weight reduction while maintaining the strength and a further reduction of frictional forces.
  • a pin bore 2 is introduced, which has a bore axis 3.
  • a right-hand area when viewing the figure is denoted by 4 and a left-hand area by 9, so that the one not-shown piston hub is located to the right of the connecting rod 1 when looking at the figure.
  • the pin bore 2 starts from the middle 11 in the direction of the right portion 4 and the left portion 9 due to the symmetry of the system piston / pin / conrod expands identically and a trumpet-shaped (or comparable ) Course.
  • the generatrices 5 or 6 of the expanding pin bore 2 may have different dimensions and are depending on the connecting rod geometry round or oval with in the axial course (in the direction of the area 4 and area 9) changing diameter or changing small and large semi-axes of the oval.
  • an upper axis 7, with respect to the bore axis 3, is smaller than the lower axis 8 below the bore axis 3 (or vice versa).
  • the shape of the widening pin bore starting from the middle 11 is a trumpet shape (or a comparable shape) and from the middle 11 in the direction of area 4 symmetrical to the course of the middle 11 to 9 area.
  • the invention thus has the advantages that the friction in the entire system, consisting of piston, piston pin and connecting rod, is reduced, that improved lubrication is given and the risk of breakage of the components involved, in particular the piston pin is reduced.
  • the present invention thus solves the hitherto known cylindrical shape of the connecting rod bore by creating transitions in the course of machining from circular to cylindrical and oval shape. Furthermore, the shapes merging into the oval geometry over the bore circumference have different radii, so that the longitudinal axes of the ovality are designed both vertically and also parallel to the piston stroke axis with different dimensions over the circumference. This freedom in the bore geometry over the bore length and the lateral surface thus allow only an exact adaptation to the deformation in the load case of the entire system.
  • a special embodiment of the invention provides, starting from the zenith of the connecting rod bore to the outer area towards the generatrices with over the bore length as elliptical with varying radii over the bore circumference, so that the bore shape has an oval, circular and again oval geometry steplessly with freely selected orientation and length of the ovality axes.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

L'invention concerne une bielle (1) dans laquelle est disposé un alésage d'axe (2) pour recevoir un axe de piston. Selon l'invention, un élargissement au-dessus d'un axe d'alésage (3), relativement à un axe (10) de course de piston, est plus petit qu'un élargissement en dessous de l'axe d'alésage (3), ou réciproquement.
PCT/EP2008/000397 2007-03-07 2008-01-19 Géométrie d'un alésage d'une bielle d'un moteur à combustion interne WO2008107041A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08707131A EP2142813A1 (fr) 2007-03-07 2008-01-19 Géométrie d'un alésage d'une bielle d'un moteur à combustion interne

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007011488A DE102007011488A1 (de) 2007-03-07 2007-03-07 Verlaufende Bohrungsgeometrie einer Pleuelbohrung eines Pleuels einer Brennkraftmaschine
DE102007011488.7 2007-03-07

Publications (1)

Publication Number Publication Date
WO2008107041A1 true WO2008107041A1 (fr) 2008-09-12

Family

ID=39322377

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/000397 WO2008107041A1 (fr) 2007-03-07 2008-01-19 Géométrie d'un alésage d'une bielle d'un moteur à combustion interne

Country Status (3)

Country Link
EP (1) EP2142813A1 (fr)
DE (1) DE102007011488A1 (fr)
WO (1) WO2008107041A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011018142A1 (fr) * 2009-08-11 2011-02-17 Ks Kolbenschmidt Gmbh Profil de trou pour un montage d'axe de piston

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2152462A1 (de) 1971-10-21 1973-04-26 Schmidt Gmbh Karl Kolben fuer verbrennungskraftmaschinen
DE3036062C2 (de) 1980-09-25 1984-06-07 Karl Schmidt Gmbh, 7107 Neckarsulm Kolben für Verbrennungskraftmaschinen
DE2756878C2 (de) 1976-12-20 1986-06-12 Dana Corp., Toledo, Ohio Verfahren zur Herstellung der Bohrung in einem Kolben zur Aufnahme eines Kolbenbolzens
DE4441450A1 (de) 1994-11-22 1996-05-23 Kolbenschmidt Ag Leichtmetallkolben für Brennkraftmaschinen
WO2000034696A1 (fr) 1998-12-11 2000-06-15 Cummins Engine Company, Inc. Bielle a alesage profile pour un pouvoir porteur accru
EP1167737A2 (fr) 2000-06-26 2002-01-02 Volkswagen Aktiengesellschaft Bielle
DE4141279C2 (de) 1991-12-14 2002-11-07 Mahle Gmbh Leichtmetallkolben für Verbrennungsmotoren mit speziell geformten Nabenbohrungen
DE10231233A1 (de) 2002-07-11 2004-02-05 Mahle Gmbh Kolben für einen Verbrennungsmotor
DE10305461A1 (de) 2003-02-04 2004-08-12 Federal-Mogul Wiesbaden Gmbh & Co. Kg Pleuelstange mit einer optimierten Lagerung, insbesondere für Verbrennungskraftmaschinen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10247130B4 (de) * 2002-10-09 2005-04-14 Maschinenfabrik Gehring Gmbh & Co Verfahren zur Herstellung einer Pleuelstange

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2152462A1 (de) 1971-10-21 1973-04-26 Schmidt Gmbh Karl Kolben fuer verbrennungskraftmaschinen
DE2756878C2 (de) 1976-12-20 1986-06-12 Dana Corp., Toledo, Ohio Verfahren zur Herstellung der Bohrung in einem Kolben zur Aufnahme eines Kolbenbolzens
DE3036062C2 (de) 1980-09-25 1984-06-07 Karl Schmidt Gmbh, 7107 Neckarsulm Kolben für Verbrennungskraftmaschinen
DE4141279C2 (de) 1991-12-14 2002-11-07 Mahle Gmbh Leichtmetallkolben für Verbrennungsmotoren mit speziell geformten Nabenbohrungen
DE4441450A1 (de) 1994-11-22 1996-05-23 Kolbenschmidt Ag Leichtmetallkolben für Brennkraftmaschinen
WO2000034696A1 (fr) 1998-12-11 2000-06-15 Cummins Engine Company, Inc. Bielle a alesage profile pour un pouvoir porteur accru
EP1167737A2 (fr) 2000-06-26 2002-01-02 Volkswagen Aktiengesellschaft Bielle
DE10231233A1 (de) 2002-07-11 2004-02-05 Mahle Gmbh Kolben für einen Verbrennungsmotor
DE10305461A1 (de) 2003-02-04 2004-08-12 Federal-Mogul Wiesbaden Gmbh & Co. Kg Pleuelstange mit einer optimierten Lagerung, insbesondere für Verbrennungskraftmaschinen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2142813A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011018142A1 (fr) * 2009-08-11 2011-02-17 Ks Kolbenschmidt Gmbh Profil de trou pour un montage d'axe de piston

Also Published As

Publication number Publication date
EP2142813A1 (fr) 2010-01-13
DE102007011488A1 (de) 2008-09-11

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