WO2019154908A1 - Piston pour un moteur à combustion interne et procédé de fabrication d'un piston - Google Patents

Piston pour un moteur à combustion interne et procédé de fabrication d'un piston Download PDF

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Publication number
WO2019154908A1
WO2019154908A1 PCT/EP2019/052996 EP2019052996W WO2019154908A1 WO 2019154908 A1 WO2019154908 A1 WO 2019154908A1 EP 2019052996 W EP2019052996 W EP 2019052996W WO 2019154908 A1 WO2019154908 A1 WO 2019154908A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
depth
ring groove
region
internal combustion
Prior art date
Application number
PCT/EP2019/052996
Other languages
German (de)
English (en)
Inventor
Johannes Trost
Original Assignee
Federal-Mogul Nürnberg 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 Federal-Mogul Nürnberg GmbH filed Critical Federal-Mogul Nürnberg GmbH
Publication of WO2019154908A1 publication Critical patent/WO2019154908A1/fr

Links

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
    • F02F3/00—Pistons 
    • 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
    • F16J1/09—Pistons; Trunk pistons; Plungers with means for guiding fluids
    • 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
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/22—Rings for preventing wear of grooves or like seatings

Definitions

  • Piston for an internal combustion engine and method for
  • the invention relates to a piston for an internal combustion engine, and a method for producing such a piston.
  • Pistons of internal combustion engines are usually provided with piston rings, wherein a lowermost, that is from the piston head, which limits the combustion chamber, the farthest located piston ring is usually designed as an oil scraper ring.
  • a sufficient oil drainage is ensured, which is often ensured by the fact that the lower groove flank of the associated Kolbenringnut has interruptions.
  • this can disadvantageously degrade the guidance of the piston ring.
  • catch piston rings in the described interruptions are disadvantageous in that they require an additional manufacturing step and thus incur costs.
  • DE 10 2005 041 002 A1 relates to a piston with a groove bottom which has a variable depth.
  • the invention has for its object to provide a cost-producible piston create, which is improved in terms of oil drainage and / or the management of an oil scraper ring.
  • the piston according to the invention has at least one piston ring groove whose depth, measured relative to the piston axis, varies over the circumference.
  • the groove bottom which is conventionally largely in the shape of a circular cylinder, is "out of round" with mountains and valleys along its circumferential extent, and the transition between these mountains and valleys can be formed in a steady course
  • Such a breakthrough is comparatively inexpensive to produce and also provides for good oil drainage.
  • the cost-effective manufacturability also applies to the piston ring groove with a depth that varies over the circumference.
  • such a groove can be formed by oscillation of a tool
  • the oil drainage can be improved without altering or interrupting the lower groove flank, in other words, preferably as a continuous annular surface with one NEM provided substantially constant outer diameter.
  • the groove with the varying depth is preferably the lowermost, in particular the third piston ring groove.
  • a particularly good oil drainage behavior can be achieved if at least one breakthrough is provided in at least one region with a comparatively large depth of the piston ring groove. Due to the larger groove volume in this area, the oil is led in the direction of the breakthrough during the accumulation in the groove, so that the drainage can be ensured.
  • the groove with a depth varying over the circumference is preferably formed by oscillation of a tool used for piercing the piston ring groove. It should also be mentioned that all the measures preferred for the piston according to the invention are applicable to the method described herein and vice versa.
  • FIG. 1 shows a bottom view of a cut in the region of the bottom piston ring groove piston.
  • the piston 10 has two skirt wall sections 12 and 14, and two piston pin bosses 16, in the region of which the depth T of a piston ring groove is smaller than between these regions.
  • the greater depth may in this case be up to twice as great as the smaller depth, and typically the difference is more than 2 mm or even more than 4 mm.
  • the piston axis is located approximately in the center of the piston shown and extends perpendicular to the plane of the drawing. Accordingly, the depth T "is measured towards the piston axis", as can be seen in addition in the figure.
  • the groove bottom can also be viewed in the direction of the piston axis and, as can be seen in the figure, run straight or have a convex curvature, but less than that in the region of the wave crests inventive piston from the conventional, cylindrical groove bottom, characterized in that the radius of the "cylinder” changes.
  • With 18 pockets are indicated below the ring field, to which oil by unrecognizable breakthroughs, which are preferably present in the areas of greater depth, are passed can.
  • the width of the skirt wall sections 12 and 14 differs in the circumferential direction, so that the connecting walls 20 adjoining the narrower skirt wall 14 have a smaller angle to the piston pin axis (running from top to bottom in the figure) , as the other two connecting walls 22, which adjoin the wider skirt wall 12.
  • the piston shown is known as "Elastoval" piston.

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)

Abstract

L'invention concerne un piston (10) pour un moteur à combustion interne comprenant au moins une rainure de segment de piston, dont la profondeur (T), mesurée en direction de l'axe du piston, varie sur toute la circonférence, au moins une ouverture étant formée dans la zone de cette rainure de segment de piston. Selon un procédé correspondant de fabrication d'un piston pour un moteur à combustion interne, au moins une rainure de segment de piston est pourvue d'une profondeur variant sur toute la circonférence, mesurée en direction de l'axe de piston, et au moins une ouverture est formée dans la zone de cette rainure de segment de piston.
PCT/EP2019/052996 2018-02-07 2019-02-07 Piston pour un moteur à combustion interne et procédé de fabrication d'un piston WO2019154908A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018201881.2A DE102018201881A1 (de) 2018-02-07 2018-02-07 Kolben für einen Verbrennungsmotor und Verfahren zur Herstellung eines Kolbens
DE102018201881.2 2018-02-07

Publications (1)

Publication Number Publication Date
WO2019154908A1 true WO2019154908A1 (fr) 2019-08-15

Family

ID=65363288

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/052996 WO2019154908A1 (fr) 2018-02-07 2019-02-07 Piston pour un moteur à combustion interne et procédé de fabrication d'un piston

Country Status (2)

Country Link
DE (1) DE102018201881A1 (fr)
WO (1) WO2019154908A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE904607C (de) * 1950-06-22 1954-02-22 Mahle Kg Kolben fuer Brennkraftmaschinen
JPH01158541U (fr) * 1988-04-15 1989-11-01
JPH11101159A (ja) * 1997-09-29 1999-04-13 Nissan Diesel Motor Co Ltd 内燃機関のピストン
JP2004308568A (ja) * 2003-04-08 2004-11-04 Nissan Motor Co Ltd 内燃機関のピストン
DE102005041002A1 (de) 2005-08-29 2007-03-01 Ks Kolbenschmidt Gmbh Leichtbaukolben
WO2015113839A1 (fr) * 2014-02-03 2015-08-06 Federal-Mogul Nürnberg GmbH Piston pour moteur à combustion interne
DE102017205152A1 (de) 2016-03-30 2017-10-05 Electro-Motive Diesel Inc. Kolben mit nutboden variabler tiefe

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6152016A (en) * 1999-01-29 2000-11-28 Daimlerchrysler Corporation Piston with cast passages
JP4177174B2 (ja) * 2003-05-29 2008-11-05 株式会社日立製作所 内燃機関用ピストン
JP4405441B2 (ja) * 2005-07-20 2010-01-27 アイシン精機株式会社 内燃機関のピストン
JP2013160129A (ja) * 2012-02-03 2013-08-19 Toyota Motor Corp 内燃機関のピストン及び内燃機関

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE904607C (de) * 1950-06-22 1954-02-22 Mahle Kg Kolben fuer Brennkraftmaschinen
JPH01158541U (fr) * 1988-04-15 1989-11-01
JPH11101159A (ja) * 1997-09-29 1999-04-13 Nissan Diesel Motor Co Ltd 内燃機関のピストン
JP2004308568A (ja) * 2003-04-08 2004-11-04 Nissan Motor Co Ltd 内燃機関のピストン
DE102005041002A1 (de) 2005-08-29 2007-03-01 Ks Kolbenschmidt Gmbh Leichtbaukolben
WO2015113839A1 (fr) * 2014-02-03 2015-08-06 Federal-Mogul Nürnberg GmbH Piston pour moteur à combustion interne
DE102017205152A1 (de) 2016-03-30 2017-10-05 Electro-Motive Diesel Inc. Kolben mit nutboden variabler tiefe

Also Published As

Publication number Publication date
DE102018201881A1 (de) 2019-08-08

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