EP2890884A1 - Piston pour un moteur à combustion interne - Google Patents

Piston pour un moteur à combustion interne

Info

Publication number
EP2890884A1
EP2890884A1 EP13753266.9A EP13753266A EP2890884A1 EP 2890884 A1 EP2890884 A1 EP 2890884A1 EP 13753266 A EP13753266 A EP 13753266A EP 2890884 A1 EP2890884 A1 EP 2890884A1
Authority
EP
European Patent Office
Prior art keywords
piston
cooling channel
central axis
circumferential
region
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.)
Withdrawn
Application number
EP13753266.9A
Other languages
German (de)
English (en)
Inventor
Timo Linke
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.)
Mahle International GmbH
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 EP2890884A1 publication Critical patent/EP2890884A1/fr
Withdrawn legal-status Critical Current

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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0672—Omega-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder center axis
    • 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
    • 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
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a piston for an internal combustion engine with a piston head and a piston skirt, wherein the piston has a piston main body and a piston ring element and wherein the piston head has a combustion bowl.
  • German patent application DE 10 2011 111 319.7 discloses a piston of reduced overall height, which is composed of a piston body and a piston ring member and having a combustion bowl, wherein the piston body and the piston ring member in the combustion recess have a circumferential joint seam, via which they are inextricably linked are.
  • the problem here is that it is very difficult to impossible to introduce more structures to improve the cooling performance in the cooling channel.
  • the object of the present invention is to further develop a generic piston so that a piston with improved cooling performance in the region of the piston head can be produced with the simplest possible means.
  • the solution consists in that the piston ring element has a part of a piston crown, a circumferential land and a ring groove provided with annular grooves, the piston main body and the piston ring element form a circumferential cooling channel which between an inner circumferential surface in the region of the combustion bowl and an outer lateral surface in the area the ring part is formed, in the cooling channel on the outer lateral surface at least one flow guide and / or on the inner circumferential surface at least one heat conducting element is provided and the piston main body and the piston ring member in the region of the piston head have a circumferential joining seam, via which they are inextricably linked.
  • the idea according to the invention consists in providing a piston with a piston ring element designed as a separate component, wherein the circumferential cooling channel is formed partly by the piston main body and partly by the piston ring element and wherein the joint seam is arranged in the region of the piston head.
  • This construction makes it possible to machine the piston main body and the piston ring element separately in the area of the later cooling duct so that the internal structure of the cooling duct and thus its cooling capacity can be adapted to the most diverse requirements of modern internal combustion engines.
  • At least one flow-guiding element is provided, which forms a constriction, which causes swirling of the cooling oil and / or acceleration of the flow of cooling oil, so that the cooling capacity of the cooling channel is increased even more.
  • At least one heat-conducting element is provided, which delivers the heat load, which is particularly high at the combustion recess or at the piston head, specifically to the cooling oil in the cooling channel.
  • the thermally particularly heavily loaded areas of the piston according to the invention are preferably cooled.
  • the joint seam arranged in the region of the piston crown runs parallel to the center axis of the piston.
  • the cooling channel may be formed as a closed cooling channel, so that the piston main body and the piston ring element are inextricably linked to each other in the region of a hub connection via a second circumferential joint seam.
  • This second seam can also run parallel to the center axis of the piston to simplify the production process.
  • cooling channel can also be designed to be open in the direction of the piston skirt and closed with a separate closure element.
  • the closure element is preferably held in the region of the ring part on the piston ring element, where it can be fastened in a particularly simple manner.
  • a preferred embodiment provides that between the piston head and the piston skirt, a circumferential recess is formed.
  • a piston with thermally decoupled shaft is characterized by high load capacity.
  • the cooling channel can be designed to be open in the direction of the piston shaft in a manner known per se and closed by a separate closure element.
  • the positioning of the joint seam in the region of the piston crown has in a piston with thermally decoupled shaft and in the direction of the piston head open trained cooling channel also has the advantage that when joining piston body and piston ring element possibly occurring welding residues (eg., Welding beads in the course of a laser welding process) not later Adhere cooling channel, but can escape from the not yet closed opening of the cooling channel.
  • the embodiment of the piston according to the invention also makes it possible without problems to produce a piston with a piston center axis radially offset and / or tilted combustion bowl, since the combustion bowl completely formed by the piston body. It is thus possible to connect such an asymmetrically designed piston body with a rotationally symmetrical piston ring element.
  • the combustion bowl offset by up to 3 mm relative to the central axis of the piston, which is not possible with conventional pistons.
  • the central axis of the combustion bowl may be at an acute angle ⁇ of up to 10 ° with the central axis of the piston.
  • An inner wall of the cooling channel can run parallel to the central axis of the piston.
  • the inner wall of the cooling channel can also run parallel to the center axis of the combustion bowl. This optimizes the cooling capacity of the cooling channel.
  • Figure 1 shows a first embodiment of a piston according to the invention in
  • Figure 2 is an enlarged partial view of another embodiment of a piston according to the invention in section;
  • Figure 3 is an enlarged partial view of another embodiment of a piston according to the invention in section;
  • Figure 4 is an enlarged partial view of another embodiment of a piston according to the invention in section.
  • FIG. 1 shows a particularly preferred exemplary embodiment of a piston 10 according to the invention.
  • the piston 10 has a piston main body 11 and a piston ring element 12. Both components can be made of any metallic material that is suitable for joining the components.
  • the piston main body 11 and the piston ring element 12 together form the piston head 13 and the piston shaft 14 of the piston 10.
  • the piston 10 is a piston with a so-called thermally decoupled piston shaft, i. that between the piston head 13 and the piston shaft 14, a circumferential recess 15 is provided.
  • the present invention is also applicable to pistons without thermally decoupled piston shaft (see Figures 3 and 4).
  • the piston shaft 14 has in known manner hubs 16 with hub bores 17 for receiving a piston pin (not shown) and the hubs 16 connecting treads 18.
  • the piston base body 11 also forms in the region of the piston head 13 an inner part 19a of a piston crown and a combustion bowl 21.
  • the combustion bowl 21 is radially offset from the central axis M of the piston 10. To illustrate dash-dotted lines the arrangement of a non-offset combustion bowl in the piston head 13 is indicated. The radial offset d can be up to 3 mm.
  • the combustion bowl 21 is tilted with respect to the center axis M of the piston 10.
  • the central axis M of the piston 10 and the center axis A of the combustion bowl 21 include an acute angle ⁇ of preferably up to 10 °.
  • the radial offset d also causes the inner part 19a of the piston crown to vary in the circumferential direction in its radial width. Further, the radial thickness of the vertical wall 21a of the combustion bowl 21 may vary in the circumferential direction.
  • the piston may also have a combustion bowl, which is radially offset only to the central axis M of the piston or tilted only about the central axis M of the piston.
  • the piston ring member 12 forms in the region of the piston head 13 an outer part 19b of the piston crown and further comprises a peripheral land land 22 and a circumferential ring portion 23 for receiving piston rings (not shown).
  • the piston main body 11 and the piston ring element 12 together form a circumferential cooling channel 24, which is formed between an inner circumferential surface 25 in the region of the combustion bowl 21 and an outer lateral surface 26 in the region of the annular portion 23. Since the embodiment shown here is a piston with a thermally decoupled piston shaft, the cooling channel 24 is closed in a manner known per se with a closure element 27. The closure element 27 is held in the embodiment in the region of the ring portion 15 on the piston ring member 12.
  • the cross section of the cooling channel 24 in the circumferential direction varies in size.
  • the outer lateral surface 26 of the cooling channel 24 preferably runs parallel to the center axis M of the piston channel. At least one lateral surface 25, 26 of the cooling channel 24 can also run parallel to the center axis A of the combustion bowl 21.
  • the piston ring member 12 is completely symmetrical, i. rotationally symmetrical, formed.
  • the radial width of the outer part 19b of the piston crown is constant in the circumferential direction. This means that such a piston ring element 12 can be combined with asymmetrically designed piston bodies of different degrees.
  • the piston base body 11 and the piston ring element 12 are joined together by joining, in the exemplary embodiment preferably by means of laser welding.
  • a joining seam 28 is formed between the inner part 19a and the outer part 19b of the piston crown, which joint runs parallel to the central axis M of the piston 10 in this particularly preferred embodiment.
  • the inventive construction of the piston 10 makes it possible to vary the interior of the later cooling channel 24 before joining the piston base body 11 and the piston ring element 12 in order to bring about optimum cooling oil flow and to improve the cooling performance.
  • a flow-guiding element 31 is accommodated in the cooling channel 24, which causes a central constriction of the cross-section of the cooling channel 24.
  • the flow guide 31 is integrally formed on the outer surface 26 prior to the joining of the piston body 11 and the piston ring member 12, i. formed on the piston ring member 12, for example. By casting or forging.
  • the central constriction of the cross section of the cooling channel 24 causes an acceleration of the flow of the cooling oil and a swirling of the cooling oil in the non-narrowed regions of the cooling channel 24, so that an improved heat dissipation from the piston head 13 in the direction of the piston shaft 14 takes place.
  • FIG. 2 shows an enlarged partial representation of a further exemplary embodiment of a piston 110 comprising a piston main body 111 and a piston ring element 112.
  • the piston 110 substantially corresponds to the piston 10 according to FIG that matching structural elements are provided with the same reference numerals and in this regard reference is made to the description of the figures for FIG.
  • a heat-conducting element 132 is formed in the cooling channel 124.
  • the heat-conducting element 132 is formed approximately tapered in cross-section, wherein the tip 132a projects obliquely downward into the cooling channel 124.
  • the sauceleitelement 132 is integrally formed in the inner circumferential surface 125, i. E., Before the joining of piston base 111 and piston ring element 112. in the piston body 111, molded, for example by casting or forging and / or mechanical processing.
  • the heat-conducting element 132 is preferably arranged below the trough edge 121a of the combustion trough 121 and effects a preferred heat removal from the trough edge 121a in the direction of the coolant received in the cooling channel 124 and thus in the direction of the piston stem.
  • the outer circumferential surface 126 extends parallel to the central axis M of the piston 110 in this embodiment.
  • FIG. 3 shows an enlarged partial representation of a further exemplary embodiment of a piston 210 comprising a piston main body 211 and a piston ring element 212.
  • the piston 210 essentially corresponds to the piston 10 according to FIG. 1, so that matching structural elements are provided with the same reference numerals and in this respect to the description of the figures 1 is referenced.
  • the cooling channel 224 is formed closed.
  • the piston main body 211 and the piston ring element 212 are connected to one another via joining seams 28, 233, for example, welded.
  • the joining seam 28 is formed between the inner part 19a and the outer part 19b of the piston crown and extends in this preferred embodiment parallel to the central axis M of the piston 210.
  • the joining seam 233 is formed between the hub connection 234 of the piston main body 211 and the ring part 23 of the piston 210 and also runs parallel to the central axis M of the piston 210.
  • the combustion bowl 221 is not radially offset or tilted with respect to the center axis M of the piston 210.
  • a heat-conducting element 232 is formed in the cooling channel 224.
  • the heat-conducting element 232 is designed to be approximately tapered in cross-section, with the tip 232a protruding obliquely downward into the cooling channel 224.
  • the heat-conducting element 232 is integrally formed in the inner circumferential surface 225, ie in the piston main body 211, before the joining of piston base body 211 and piston ring element 212, for example by casting or forging and / or mechanical processing.
  • the heat-conducting element 232 is preferably arranged below the trough edge 221a of the combustion trough 221 and effects a preferred heat removal from the trough edge 221a in the direction of the coolant received in the cooling channel 224 and thus in the direction of the piston stem.
  • the outer circumferential surface 226 extends parallel to the central axis M of the piston 210 in this embodiment.
  • FIG. 4 shows a further exemplary embodiment of a piston 310 according to the invention.
  • the piston 310 substantially corresponds to the piston 210 according to FIG. 3, so that reference is made to the description of the figures relating to FIG.
  • a flow guide element 331 is accommodated in the cooling channel 324, which causes a central constriction of the cross section of the cooling channel 324.
  • the flow guide 331 is integrally formed with the outer surface 326, i.e., before joining the piston body 311 and piston ring member 312. formed on the piston ring member 312, for example.
  • the central narrowing of the cross section of the cooling channel 324 causes an acceleration of the flow of the cooling oil and a swirling of the cooling oil in the non-narrowed portions of the cooling channel 324, so that an improved heat dissipation from the piston head takes place in the direction of the piston skirt.

Landscapes

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

Abstract

Piston (10, 110, 210, 310) pour un moteur à combustion interne, qui comporte une tête de piston (13) et une jupe de piston (14), le piston (10, 110, 210, 310) comportant un corps de base (11, 111, 211, 311) et un élément segment de piston (12, 112, 212, 312), ladite tête de piston (13) comportant une cavité de combustion (21, 121, 221). Ledit piston est caractérisé en ce que l'élément segment de piston (12, 112, 212, 312) comporte une partie (19b) d'un fond de piston, un cordon de feu périphérique (22) et une partie de segment (23) périphérique pourvue de rainures, en ce que le corps de base (11, 111, 211, 311) et l'élément segment de piston (12, 112, 212, 312) forment un canal de refroidissement (24, 124, 224, 324) périphérique situé entre une surface latérale interne (25, 125, 225) se trouvant dans la zone de la cavité de combustion (21, 121, 221) et une surface latérale externe (26, 126, 226, 326) se trouvant dans la zone de la partie de segment (23), en ce qu'au moins un élément de guidage d'écoulement (31, 331) est situé dans le canal de refroidissement (24, 124, 224, 324) sur la surface latérale externe (26, 226) et/ou qu'au moins un élément thermoconducteur (132, 232) est situé sur la surface latérale interne (125, 225), et en ce que le corps de base (11, 111, 211, 311) et l'élément segment de piston (12, 112, 212, 312) comportent dans la zone du fond de piston (19a, 19b) une soudure de liaison (28) périphérique grâce à laquelle ils sont reliés à demeure l'un à l'autre.
EP13753266.9A 2012-07-18 2013-07-18 Piston pour un moteur à combustion interne Withdrawn EP2890884A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012014193.9A DE102012014193A1 (de) 2012-07-18 2012-07-18 Kolben für einen Verbrennungsmotor
PCT/DE2013/000405 WO2014012532A1 (fr) 2012-07-18 2013-07-18 Piston pour un moteur à combustion interne

Publications (1)

Publication Number Publication Date
EP2890884A1 true EP2890884A1 (fr) 2015-07-08

Family

ID=49036399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13753266.9A Withdrawn EP2890884A1 (fr) 2012-07-18 2013-07-18 Piston pour un moteur à combustion interne

Country Status (7)

Country Link
US (1) US20150184613A1 (fr)
EP (1) EP2890884A1 (fr)
JP (1) JP2015522138A (fr)
CN (1) CN104541044A (fr)
BR (1) BR112015001027A2 (fr)
DE (1) DE102012014193A1 (fr)
WO (1) WO2014012532A1 (fr)

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US10240556B2 (en) * 2015-01-30 2019-03-26 Tenneco Inc. Piston with cooling gallery cooling insert and method of construction thereof
DE102017205716A1 (de) * 2017-04-04 2018-10-04 Mahle International Gmbh Kolben einer Brennkraftmaschine
DE102017205717A1 (de) * 2017-04-04 2018-10-04 Mahle International Gmbh Kolben einer Brennkraftmaschine
CN107084069A (zh) * 2017-05-22 2017-08-22 无锡华星机电制造有限公司 一种发动机活塞
CN109931178B (zh) * 2017-12-19 2021-10-15 强莉莉 一种活塞及其成型方法
US10704491B2 (en) 2018-10-11 2020-07-07 Tenneco Inc. Piston cooling gallery shaping to reduce piston temperature
US10926362B2 (en) * 2018-12-13 2021-02-23 Caterpillar Inc. Remanufactured engine piston and method
CN109500361A (zh) * 2019-01-22 2019-03-22 马勒汽车技术（中国）有限公司 盐芯和活塞
DE102019213953A1 (de) * 2019-09-12 2021-03-18 Mahle International Gmbh Kolben für eine Brennkraftmaschine
US11326549B2 (en) * 2020-01-21 2022-05-10 Ford Global Technologies, Llc 218-0266 volcano-shaped inlet of piston oil-cooling gallery
EP4256193A2 (fr) * 2020-12-03 2023-10-11 Cummins, Inc. Piston, ensemble bloc et procédé de refroidissement
CN114810410B (zh) * 2022-05-10 2023-08-18 潍柴动力股份有限公司 一种活塞及发动机

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Also Published As

Publication number Publication date
JP2015522138A (ja) 2015-08-03
CN104541044A (zh) 2015-04-22
DE102012014193A1 (de) 2014-05-15
US20150184613A1 (en) 2015-07-02
WO2014012532A1 (fr) 2014-01-23
BR112015001027A2 (pt) 2017-06-27

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