US20160061326A1 - Joined connection on a two-piece steel piston and joining method - Google Patents

Joined connection on a two-piece steel piston and joining method Download PDF

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Publication number
US20160061326A1
US20160061326A1 US14/422,852 US201314422852A US2016061326A1 US 20160061326 A1 US20160061326 A1 US 20160061326A1 US 201314422852 A US201314422852 A US 201314422852A US 2016061326 A1 US2016061326 A1 US 2016061326A1
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US
United States
Prior art keywords
piston
joining
piston upper
joining process
wall
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US14/422,852
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English (en)
Inventor
Eberhard Weiss
Emmerich Ottliczky
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KS Kolbenschmidt GmbH
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
Publication of US20160061326A1 publication Critical patent/US20160061326A1/en
Abandoned legal-status Critical Current

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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 
    • F02F3/0015—Multi-part pistons
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • 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
    • F16J1/005—Pistons; Trunk pistons; Plungers obtained by assembling several pieces
    • 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
    • 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
    • F16J1/01—Pistons; Trunk pistons; Plungers characterised by the use of particular materials

Definitions

  • the disclosure relates to a piston for an internal combustion engine and a method for producing a piston for an internal combustion engine.
  • pistons for internal combustion engines consist of at least two parts. These two parts are firstly a ring section that forms the upper land, amongst other things, and includes at least one, or two or more ring grooves, and a base section that, in an intrinsically known way, forms the piston pin bore, the piston bosses, and the piston skirt. These two parts are joined in a suitable shape. The ring element and the base section are shaped in such a manner that a cooling gallery is formed after the two parts are joined.
  • the piston may, but does not have to, include a combustion bowl.
  • DE 10 2010 056 220 A1 discloses a welded connection for producing a piston consisting of at least two individual parts. Assembling the parts of the piston in the correct location is extremely complex in this instance because a positioning device is lacking.
  • DE 10 2007 036 236 A1 discloses an assembled, specifically two-part, piston for an internal combustion engine having a piston upper part and a piston lower part that are joined by means of a thread.
  • joining the piston parts by means of a threaded connection is extremely labor-intensive and therefore extremely cost-intensive.
  • Known joining methods are, for example, press-fitting, soldering, welding, bolting, pinning, or similar. It is essential that a single-piece piston is created from the two individual parts mentioned (ring section and base section) after the two parts are joined, where this single-piece piston gives rise to an operational piston after it is completed in the usual way with rings, pins, pin lock rings and similar parts.
  • ring element and base part also called the lower part
  • a joined connection in particular, a material-to-material joined connection, for example, soldering or welding
  • the present disclosure relates to a piston, in particular a cooling-gallery piston for an internal combustion engine, having a piston lower part and a piston upper part that are joined to form one piston in a joining process, wherein the piston upper part has at least one ring belt and an inner wall, wherein provision is made for the piston lower part to have a radially circumferential oblique surface at the end facing the piston upper part that interacts with the inner wall of the piston upper part to bring about a centering action during the joining process.
  • the piston upper part can be designed such that it includes the subsequent ring belt and the subsequent edge zone of the bowl.
  • This piston upper part is designed as a ring with an inverted U-shaped profile having legs of different lengths. The longer, outer leg later forms the ring belt. The subsequent edge zone of the bowl is formed by the shorter, inner leg. The advantage of this is that a suitable material differing from the piston lower part can be used in highly stressed areas.
  • the piston lower part can have at least one sliding surface that interacts with the inner wall of the piston upper part during the joining process.
  • This at least one sliding surface offers the advantage that low force is to be applied during the joining of the piston lower part and the piston upper part.
  • At least one seat in the area of at least one joint seam at least one seat can be provided to create a gap. As the result of the at least one seat, a gap is created with defined dimensions.
  • the gap adjacent the seat to serve to receive brazing material.
  • a repository can be provided to receive soldering material.
  • the gap forms a reservoir for process media in conjunction with the seat. It is advantageous that this reservoir can be filled selectively, for example, before the joining process. After the joining, the process medium, for example, soldering material, is available at the effective location in the correct dosage. After carrying out a soldering process, for example, to join the piston parts, the excess soldering material can be removed along with partial areas of the reservoir.
  • a circumferential collar is provided on the piston upper part interacting with a seat as a limit during the joining process.
  • the precise, subsequent (height) dimension of the piston is defined by the collar.
  • the precise dimension of the piston can also be adjusted by removing the collar.
  • the collar acts as an aid in finding the exact position of the piston lower part and the piston upper part with respect to each other in the joining process and it can be removed after joining.
  • the piston upper part can form at least one ring belt after the joining procedure.
  • the ring belt serves to receive piston rings in a known manner.
  • the method for producing a piston comprises the following steps:
  • the piston upper part and piston lower part slide on each other into the correct final position to complete the joining process. Centering ensures that the midpoint toward the piston stroke axis of the piston upper part lies above the midpoint toward the piston stroke axis of the piston lower part.
  • At least one seat for the joining procedure is removed in at least one additional operational step.
  • the seat serves to find a defined position of piston lower part to piston upper part and can therefore be removed after the joining process is completed.
  • the two components to be joined may consist of the same material or of different materials.
  • the two components can be produced by the same method or by different methods (e.g. forging, casting or similar).
  • FIG. 1 shows a sectional view of a first aspect of the piston prior to joining
  • FIG. 2 shows a sectional view of the piston after being joined
  • FIG. 3 shows a sectional view of a completed piston
  • FIG. 4 shows a sectional view of a second aspect of the piston
  • FIG. 5 shows a sectional view of the piston of FIG. 4 after being joined
  • FIG. 6 shows a sectional view of the piston of FIG. 5 prior to the groove being closed
  • FIG. 7 shows a sectional view of the finished piston shown in FIGS. 4-6 .
  • FIGS. 1 to 3 show a first aspect of a piston 1
  • FIGS. 4 to 7 show a further second-aspect of a piston 3 .
  • identical reference numerals are used for identical elements.
  • FIG. 1 shows a piston 1 consisting of a piston lower part 2 and a piston upper part 3 designed as a ring prior to joining.
  • the piston upper part 3 has a seat 4 .
  • the piston upper part 3 may have a repository 5 that can serve to hold soldering paste, for example.
  • the piston lower part 2 has an oblique surface 6 running radially around the outer circumference.
  • F identifies the direction for joining the piston lower part 2 and the piston upper part 3 .
  • the ring-shaped piston upper part 3 has a collar 14 , oriented radially circumferential to the piston center.
  • a radially circumferential stop 15 is located in the upper end area of the piston lower part 2 .
  • the joining procedure is complete when the lower area of the inner wall makes contact with the oblique surface 6 and the collar 14 makes contact with the stop 15 .
  • the oblique surface 6 assumes the function of a centering device during the joining procedure. Additional materials, such as solder paste, may be, but do not have to be, introduced into the repository 5 prior to the joining procedure. It is also conceivable to include materials or substances in the repository 5 that serve for the later material-to-material connection between the piston lower part 2 and the piston upper part 3 .
  • FIG. 2 shows the later piston 1 after the joining procedure of the piston lower part 2 and the piston upper part 3 .
  • the inner wall 7 of the ring-shaped piston upper part 3 has made contact with the radially circumferential oblique surface 6 of the piston lower part 2 .
  • the radially circumferential collar 14 of the piston upper part 3 has made contact with the similarly radially circumferential stop 15 of the piston lower part 2 .
  • a radially circumferential open space has formed that can act as a cooling gallery 13 .
  • the piston lower part 2 has a bowl 11 in which the combustion process takes place when the internal combustion engine is operating.
  • FIG. 3 shows the now finished, one-piece piston 1 .
  • Joining seams 17 are clearly recognizable that designate the transition zone between the former piston lower part 2 and the piston upper part 3 .
  • the piston 1 was machined in one area 18 such that a radially circumferential flat surface was created to the greatest extent possible. To achieve this, the collar 14 and parts of the stop 15 were removed.
  • a radially circumferential ring belt 16 was introduced in the upper area of the piston 1 .
  • a material-to-material joint can be made in the area between the oblique surface 6 of the piston lower part 2 and the piston upper part 3 , for example, by welding or soldering.
  • a tight join between the piston upper part 3 and the piston lower part 2 is advantageous in order to prevent the escape of cooling medium from the cooling gallery 13 .
  • a piston lower part 32 again has a radially circumferential oblique surface 6 .
  • the ring-shaped piston upper part 33 has the shape of an inverted “U” with legs 19 , 20 of unequal length.
  • the longer, outer leg 19 is used to form the ring belt 16 after the joining procedure.
  • the shorter leg 20 is used to form a bowl edge ring 12 after the joining procedure.
  • the piston lower part 32 has a radially circumferential web 21 in the area of a bowl 11 formed after the joining process.
  • a sliding surface 8 and an oblique surface 6 are formed at the upper outer circumference of the piston lower part 32 .
  • FIG. 5 shows the piston 31 after the joining process.
  • An optional contact surface 9 can be provided between the web 21 and the lower end of the leg 20 to form a soldering gap.
  • Centering 10 of the piston upper part 33 and the piston lower part 32 is carried out through the interaction of the oblique surface 6 with the lower end of the inner wall 7 .
  • a positive-locking, friction-locking or material-to-material joint between the piston lower part 32 and the piston upper part 33 can be made, for example, a soldered or welded joint can be provided.
  • FIGS. 6 and 7 the completed piston 31 is shown in FIGS. 6 and 7 . It can be seen that centering has been maintained after the machining. During the machining of the edge zone of the bowl 11 , the contact surface 9 for the solder gap, where it existed, was removed. The joint seams 17 between the piston lower part 32 and the piston upper part 33 are visible. A ring belt 16 was likewise created. The bowl 11 has been given its functional profile.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
US14/422,852 2012-08-23 2013-08-23 Joined connection on a two-piece steel piston and joining method Abandoned US20160061326A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102012215043.9 2012-08-23
DE102012215043 2012-08-23
PCT/EP2013/067559 WO2014029878A1 (de) 2012-08-23 2013-08-23 Fügeverbindung an einem zweiteiligen stahlkolben und fügeverfahren

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2013/067559 A-371-Of-International WO2014029878A1 (de) 2012-08-23 2013-08-23 Fügeverbindung an einem zweiteiligen stahlkolben und fügeverfahren

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US15/802,739 Continuation US11098800B2 (en) 2012-08-23 2017-11-03 Joined connection on a two-part piston and joining method

Publications (1)

Publication Number Publication Date
US20160061326A1 true US20160061326A1 (en) 2016-03-03

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US14/422,852 Abandoned US20160061326A1 (en) 2012-08-23 2013-08-23 Joined connection on a two-piece steel piston and joining method
US15/802,739 Active US11098800B2 (en) 2012-08-23 2017-11-03 Joined connection on a two-part piston and joining method

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US15/802,739 Active US11098800B2 (en) 2012-08-23 2017-11-03 Joined connection on a two-part piston and joining method

Country Status (4)

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US (2) US20160061326A1 (de)
EP (1) EP2888466A1 (de)
DE (1) DE102013216854A1 (de)
WO (1) WO2014029878A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106979329A (zh) * 2017-05-23 2017-07-25 湖南江滨机器（集团）有限责任公司 一种全钢活塞
US20180369955A1 (en) * 2017-06-27 2018-12-27 Mahle International Gmbh Method for producing a piston for an internal combustion engine consisting of a piston upper part and of a piston lower part
US10801438B2 (en) * 2017-07-05 2020-10-13 Mahle International Gmbh Method for producing a piston

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MX2018004720A (es) * 2015-11-17 2018-07-06 Ks Kolbenschmidt Gmbh Piston para un motor de combustion interna.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070295299A1 (en) * 2006-06-12 2007-12-27 Mahle Technology, Inc. Piston for a combustion engine
US8991046B2 (en) * 2009-07-14 2015-03-31 Mahle International Gmbh Multi-part piston for an internal combustion engine and method for the production thereof

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE123962C (de)
FR1451838A (fr) * 1965-10-28 1966-01-07 Tsni Dizelny I Piston perfectionné pour moteurs à combustion interne
DD123962A1 (de) 1975-12-24 1977-01-26
WO2007093289A1 (de) * 2006-02-17 2007-08-23 Ks Kolbenschmidt Gmbh Mehrteiliger stahlkolben für einen verbrennungsmotor mit einem kühlkanal
DE102007036236A1 (de) 2007-08-02 2009-02-05 Mahle International Gmbh Gebauter Kolben
DE102007044106A1 (de) * 2007-09-15 2009-03-19 Mahle International Gmbh Zweiteiliger Kolben für einen Verbrennungsmotor
DE102010056220A1 (de) 2010-12-24 2012-06-28 Mahle International Gmbh Kolben für einen Verbrennungsmotor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070295299A1 (en) * 2006-06-12 2007-12-27 Mahle Technology, Inc. Piston for a combustion engine
US8991046B2 (en) * 2009-07-14 2015-03-31 Mahle International Gmbh Multi-part piston for an internal combustion engine and method for the production thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106979329A (zh) * 2017-05-23 2017-07-25 湖南江滨机器（集团）有限责任公司 一种全钢活塞
US20180369955A1 (en) * 2017-06-27 2018-12-27 Mahle International Gmbh Method for producing a piston for an internal combustion engine consisting of a piston upper part and of a piston lower part
US10919109B2 (en) * 2017-06-27 2021-02-16 Mahle International Gmbh Method for producing a piston for an internal combustion engine consisting of a piston upper part and of a piston lower part
US10801438B2 (en) * 2017-07-05 2020-10-13 Mahle International Gmbh Method for producing a piston

Also Published As

Publication number Publication date
US11098800B2 (en) 2021-08-24
US20180051805A1 (en) 2018-02-22
WO2014029878A1 (de) 2014-02-27
EP2888466A1 (de) 2015-07-01
DE102013216854A1 (de) 2014-02-27

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