WO2015104013A1 - Piston pour moteur à combustion interne et son procédé de fabrication - Google Patents

Piston pour moteur à combustion interne et son procédé de fabrication Download PDF

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Publication number
WO2015104013A1
WO2015104013A1 PCT/DE2014/000651 DE2014000651W WO2015104013A1 WO 2015104013 A1 WO2015104013 A1 WO 2015104013A1 DE 2014000651 W DE2014000651 W DE 2014000651W WO 2015104013 A1 WO2015104013 A1 WO 2015104013A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
bowl
combustion
wall
depression
Prior art date
Application number
PCT/DE2014/000651
Other languages
German (de)
English (en)
Inventor
Rainer Scharp
Klaus Keller
Daniel Mock
Original Assignee
Mahle International 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 Mahle International Gmbh filed Critical Mahle International Gmbh
Publication of WO2015104013A1 publication Critical patent/WO2015104013A1/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 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • 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 
    • F02F3/0015—Multi-part pistons
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • F02F2003/0061—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by welding
    • 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 
    • F02F3/0076—Pistons  the inside of the pistons being provided with ribs or fins

Definitions

  • the present invention relates to a piston for an internal combustion engine, comprising a piston main body and a piston bowl element, wherein the piston main body has a bottom portion and a part of the well wall of a combustion recess having a dome and a piston skirt, wherein the piston recess element at least a portion of a piston crown and a part of the well wall the combustion bowl, wherein the piston base body and the piston bowl element form a circumferential cooling channel, and wherein the piston body and the piston bowl element in the region of the trough wall of the combustion bowl are non-detachably connected to each other via a laser weld.
  • a generic piston is known, for example, from DE 10 2011 013 113 A1 and is also referred to as "piston with thermally decoupled piston shaft.” Such pistons are characterized by high strength and high heat resistance due to the thermal decoupling of the piston head and piston shaft ,
  • the generic piston has a comparatively low compression height. This has the disadvantage in laser welding that the laser beam must be controlled so that it does not touch the dome of the combustion bowl.
  • the weld is therefore arranged very steeply and in the vicinity of the bottom of the combustion bowl, where the piston base body and the piston bowl element have different material volumes in the region of their joining surfaces. Especially in the case of the piston main body, the material volumes in this area are very different. Therefore, there is a risk that the material of the piston main body and the piston bowl element melts unevenly in the region of the laser weld seam. This leads to stresses in the material structure, which can cause cracking in the piston.
  • the object of the present invention is to develop a generic piston so that the occurrence of stresses in the material structure after laser welding is at least reduced.
  • the average height H of the part of the trough wall is 4% to 12% of the largest diameter of the combustion bowl and that the laser weld includes an angle ⁇ of at least 5 ° with a tangent applied from the laser weld on the dome.
  • the idea according to the invention thus consists in setting the parameters according to the invention of mean height H and angle ⁇ such that, independently of the individual dimensions of the individual piston, the laser weld seam is arranged as close as possible to a region of the depression wall in which its thickness is constant.
  • the essential prerequisite is met that during laser welding, the materials of the piston main body and the piston recess element melt as evenly as possible on both sides of the laser weld, especially over the circumference of the joining surfaces and cool, so that the occurrence of stresses in the laser weld reduces or even is avoided.
  • Another advantage of the idea according to the invention is that the laser weld runs as flat as possible in order to reduce the welding length and the necessary welding energy. At the same time, it is advantageous to arrange the laser weld in as large a distance as possible from the highly loaded bowl edge region.
  • the angle ⁇ can be up to 20 ° in order to effect a sufficient distance of the laser beam from the dome of the combustion bowl.
  • the largest diameter D of the combustion bowl can be for example 100 mm.
  • the height H of the part of the trough wall on the piston main body is 4mm to 12mm.
  • the laser weld is located exactly in the region of the well wall in which its thickness is constant. In this case, the material of both the piston base body and the piston bowl element during laser welding is always uniformly melted on both sides of the laser weld seam.
  • the piston according to the invention may have a cooling channel which is open at the bottom and closed by a closure element.
  • the piston bowl element in addition to the part of the bowl wall, encompasses the entire piston crown, the circumferential top land and the circumferential ring part.
  • closure element is integrally formed on the piston body. Thus, no separate closure element must be made and mounted on the piston.
  • the integrally formed with the piston body body closure element is preferably designed as a circumferential, extending to the piston bowl element flange which bears in a particularly expediently tension-free in an undercut formed on the piston bowl element.
  • the piston according to the invention can also have a closed cooling channel.
  • a piston depression element which, in addition to the part of the depression wall, merely comprises a part of the piston crown, is sufficient.
  • the present invention is particularly suitable for pistons whose compression height is at most 55% of the piston diameter.
  • Figure 1 shows a first embodiment of a piston according to the invention in section, wherein the right half opposite the left half is shown rotated by 90 °;
  • Figure 2 shows another embodiment of a piston according to the invention in
  • FIG. 3 is an enlarged view of the piston bowl element and the laser weld seam of the piston according to FIG. 2;
  • Figure 4 is a sectional view of the piston along the line IV - IV according to FIG.
  • FIG. 1 shows a first exemplary embodiment of a piston 10 according to the invention.
  • the piston 10 has a piston main body 11 and a piston depression element 12. Both components can be made of any metallic material that is suitable for joining the components by laser welding.
  • the piston main body 11 and the piston recess element 12 together form the piston head 13 of the piston 10.
  • the piston base body 11 further forms the piston skirt 14 of the piston 10, which is provided in known manner with piston hubs 15 and hub bores 16 for receiving a piston pin (not shown) and with running surfaces 17.
  • the piston head 13 is further provided with a combustion recess 18.
  • the piston body 11 forms a dome 21 having bottom 19 of the combustion bowl 18.
  • the piston body 11 also forms a part 23 of the trough wall 22 of the combustion bowl 18.
  • the piston recess member 12 forms the remaining part 24 of the trough wall 22 and a part of the piston crown 25.
  • the circumferential top land 26 and the annular grooves provided with annular ring portion 27 of the piston 10 are also formed by the piston body 11.
  • the piston main body 11 and the piston recess element 12 form a circulating at the height of the ring portion 27 cooling channel 28th
  • the piston main body 11 and the piston recess element 12 are connected to one another by laser welding. As a result, 25 laser welds 31, 32 are formed in the trough wall 22 and in the piston crown.
  • the height H of the part 23 of the trough wall 22 formed by the piston main body 11 is 4% to 12% of the largest diameter D of the combustion trough 18.
  • the height H is defined as the distance between one from the lowest point of the combustion trough 18 to the lowest point of the cooling duct 28 extending base line and a point which is arranged centrally on the laser weld 31 (see also Figure 3).
  • the laser weld 31 includes an angle ⁇ of at least 5 ° with a tangent T applied from the laser weld 31 on the dome 21.
  • FIGS. 2 and 3 show a further exemplary embodiment of a piston 110 according to the invention.
  • the piston 110 has a piston main body 111 and a piston depression element 112. Both components can be made of any metallic material that is suitable for laser welding of the components.
  • the piston main body 111 and the piston ring element 112 together form the piston head 113 of the piston 110.
  • the piston main body 111 further forms the piston skirt 114 of the piston 110, which is provided in known manner with piston hubs 115 and hub bores 116 for receiving a piston pin (not shown) and with running surfaces 117.
  • the piston head 113 is further provided with a combustion bowl 118.
  • the piston base body 111 forms the dome 121 having bottom 119 of the combustion bowl 118.
  • the piston body 111 also forms a part 123 of Tray wall 122 of the combustion bowl 118.
  • the piston bowl member 112 forms the remaining portion 124 of the well wall 122 and the piston head 125, the peripheral land 126 and the annular groove provided with annular ring portion 127 of the piston 110th
  • the piston main body 111 and the piston recess element 112 form a downwardly open cooling channel 128, which is closed by a closure element 133.
  • the closure element 133 is embodied as a circumferential, integrally formed on the piston main body 111 and extending to the piston recess element 112.
  • the closure element 133 lies stress-free in an undercut 134 formed on the piston depression element 112 (see in particular FIG. 3).
  • the piston skirt 114 is separated from the ring section 127 by a circumferential annular recess 135. Thus, the piston skirt 114 is thermally decoupled from the piston head 113.
  • the piston main body 111 and the piston bowl element 112 are connected to each other by laser welding. As a result, a laser weld seam 131 is formed in the trough wall 122.
  • the height H of the portion 123 of the well wall 122 formed by the piston body 111 is 4% to 12% of the largest diameter D of the combustion bowl 118.
  • the height H is defined as the distance between a lowest point of the combustion bowl 118 and the lowest point of the cooling passage 128 extending base line and a point which is arranged centrally on the laser weld 131 (see Figure 3).
  • the laser weld seam 131 includes an angle ⁇ of at least 5 ° with a tangent T applied from the laser weld seam 131 on the dome 121.
  • heat affected zones 136, 137 are indicated by dashed lines, in which the material of the piston base body 11, 111 and the piston recess element 12, 112 completely or partially melts with the laser welding.
  • the laser weld seam 31, 131 is arranged in a region of the trough wall 22, 122 in which its thickness, in particular also over the circumference of the joining surfaces of the piston main body and the piston trough element, is substantially constant.
  • the essential prerequisite is met that melt during laser welding, the materials of the piston body 11, 111 and the Kolbenmuldenelements 12, 112 on both sides of the laser weld 31, 131 as uniformly as possible and cool, so that the occurrence of stresses in the laser weld 31st 131 is reduced or even avoided.
  • the piston 110 has support ribs 138 in the cooling channel 128 in order to increase its stability.
  • the support ribs 138 are arranged in the direction of the piston crown 125 and extend into the cooling channel 128.
  • the height h of the support ribs 138 is a maximum of half the total height of the cooling channel 128, so that ensures an unobstructed flow of cooling oil remains. By this construction shaker spaces are formed for the cooling oil, which increase the cooling effect.
  • the supporting ribs 138 are, as shown in Figure 4, radially symmetrical ß at an angle with respect to the piston main axes K H, of 45 ° over the circumference of the cooling channel 128 are arranged distributed and can be prepared by mechanical processing, such as machining, or by forging produced become.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

La présente invention concerne un piston (10, 110), destiné à un moteur à combustion interne, qui comprend un corps de base de piston (11, 111) et une cavité de piston (12, 112), le corps de base de piston (11, 111) comportant une zone de fond (19, 119) et une partie (23, 123) de la paroi (22, 122) d'une cavité de combustion (18, 118), pourvue d'un dôme (21, 121), ainsi qu'une tige de piston (14, 114), la cavité de piston (12, 112) comportant au moins une partie de fond de piston (25, 125) et une partie (24, 124) de la paroi (22, 122) de la cavité de combustion (18, 118), le corps de base de piston (11, 111) et la cavité de piston (12, 112) formant un conduit de refroidissement périphérique (28, 128), et le corps de base de piston (11, 111) et la cavité de piston (12, 112) étant reliés entre eux de manière non amovible au niveau de la paroi de cavité (22, 122) de la cavité de combustion (18, 118) par le biais d'un cordon de soudure au laser (31, 131). Selon l'invention, au niveau du corps de base de piston (11, 111), la hauteur moyenne (H) de la partie (23, 123) de la paroi de cavité (22, 122) représente 4% à 12% du plus grand diamètre (D) de la cavité de combustion (18, 118) et le cordon de soudure au laser (31, 131) fait avec une tangente (T) au dôme (21, 121), à partir du cordon de soudure au laser (31, 131), un angle (a) d'au moins 5°.
PCT/DE2014/000651 2014-01-08 2014-12-30 Piston pour moteur à combustion interne et son procédé de fabrication WO2015104013A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014000253.5A DE102014000253A1 (de) 2014-01-08 2014-01-08 Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
DE102014000253.5 2014-01-08

Publications (1)

Publication Number Publication Date
WO2015104013A1 true WO2015104013A1 (fr) 2015-07-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2014/000651 WO2015104013A1 (fr) 2014-01-08 2014-12-30 Piston pour moteur à combustion interne et son procédé de fabrication

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DE (1) DE102014000253A1 (fr)
WO (1) WO2015104013A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015213689A1 (de) * 2015-07-21 2017-01-26 Federal-Mogul Nürnberg GmbH Kolben für einen Verbrennungsmotor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011013143A1 (de) * 2011-03-04 2012-09-06 Mahle International Gmbh Kolben für einen Verbrennungsmotor sowie Verfahren zu seiner Herstellung
DE102011013113A1 (de) 2011-03-04 2012-09-06 Mahle International Gmbh Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
DE102012008682A1 (de) * 2011-07-12 2013-01-17 Mahle International Gmbh Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
DE102011107656A1 (de) * 2011-07-12 2013-01-17 Mahle International Gmbh Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor sowie Kolben für einen Verbrennungsmotor
US20130068096A1 (en) * 2011-09-21 2013-03-21 Dieter Gabriel Laser welded piston assembly
DE102012216367A1 (de) * 2011-09-28 2013-03-28 Ks Kolbenschmidt Gmbh Zweiteiliger Stahlkolben für Brennkraftmaschinen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10325914B4 (de) * 2003-06-07 2012-08-02 Mahle Gmbh Kolben für einen Verbrennungsmotor
DE102004058968A1 (de) * 2004-12-08 2006-06-14 Mahle International Gmbh Zweiteiliger Kolben für einen Verbrennungsmotor
JP2007270812A (ja) * 2006-03-31 2007-10-18 Yamaha Motor Co Ltd 内燃機関用ピストン
US9856820B2 (en) * 2010-10-05 2018-01-02 Mahle International Gmbh Piston assembly

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011013143A1 (de) * 2011-03-04 2012-09-06 Mahle International Gmbh Kolben für einen Verbrennungsmotor sowie Verfahren zu seiner Herstellung
DE102011013113A1 (de) 2011-03-04 2012-09-06 Mahle International Gmbh Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
DE102012008682A1 (de) * 2011-07-12 2013-01-17 Mahle International Gmbh Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
DE102011107656A1 (de) * 2011-07-12 2013-01-17 Mahle International Gmbh Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor sowie Kolben für einen Verbrennungsmotor
US20130068096A1 (en) * 2011-09-21 2013-03-21 Dieter Gabriel Laser welded piston assembly
DE102012216367A1 (de) * 2011-09-28 2013-03-28 Ks Kolbenschmidt Gmbh Zweiteiliger Stahlkolben für Brennkraftmaschinen

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