WO2014001523A2 - Piston pour un moteur à combustion interne - Google Patents

Piston pour un moteur à combustion interne Download PDF

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Publication number
WO2014001523A2
WO2014001523A2 PCT/EP2013/063671 EP2013063671W WO2014001523A2 WO 2014001523 A2 WO2014001523 A2 WO 2014001523A2 EP 2013063671 W EP2013063671 W EP 2013063671W WO 2014001523 A2 WO2014001523 A2 WO 2014001523A2
Authority
WO
WIPO (PCT)
Prior art keywords
piston
piston part
parts
recess
region
Prior art date
Application number
PCT/EP2013/063671
Other languages
German (de)
English (en)
Other versions
WO2014001523A3 (fr
Inventor
Oliver Heinold
Torsten Kunz
Marc Bareis
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2014001523A2 publication Critical patent/WO2014001523A2/fr
Publication of WO2014001523A3 publication Critical patent/WO2014001523A3/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 
    • F02F3/0015—Multi-part pistons
    • 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
    • F02B23/0603—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 at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head
    • 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
    • F02B23/0633—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 the combustion space being almost completely enclosed in the piston, i.e. having a small inlet in comparison to its volume
    • 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
    • F02F3/0023—Multi-part pistons the parts being bolted or screwed together
    • 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
    • F02B23/0603—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 at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head
    • F02B2023/0612—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 at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head the material having a high temperature and pressure resistance, e.g. ceramic
    • 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 invention relates to a piston for an internal combustion engine according to the preamble of claim 1.
  • a piston according to the preamble of claim 1 is known from DE 10 2004 028 459 A1.
  • the two, possibly made of different materials piston parts are connected to each other in a horizontally extending parting plane, the connection via a shrink connection.
  • the upper, a fuel injector facing piston member has a piston head with a trough.
  • a piston with a piston head is known, which is formed in a recess which forms an undercut. The production of such a piston is relatively complicated by the shape of the recess.
  • the invention has the object, a piston for an internal combustion engine according to the preamble of claim 1 such that a manufacturing technology particularly advantageous manufacturing is possible.
  • This object is achieved in a piston for an internal combustion engine with the features of claim 1, characterized in that the piston crown is arranged in the first piston part in the region of a recess having an undercut, and that the two piston parts are interconnected in a horizontal parting plane, at least partially arranged in the region of the recess.
  • Such an arrangement of the parting plane in a two-part piston allows a particularly favorable or easy manufacturability of these two piston parts so- as the recess, since the piston parts form the desired recess with the undercut after their connection.
  • the recess is thus formed divided horizontally.
  • Piston parts made of the same material (in particular aluminum), and that the first piston part is inserted into a recess with a radially encircling edge of the second piston part.
  • Such an embodiment has the advantage of a particularly low weight and a particularly good heat dissipation from the region of the trough collar.
  • the setting behavior of the screw is particularly easy to control.
  • the two piston parts consist of different materials.
  • the two piston parts can be optimized according to the specific requirements.
  • the material of the combustion chamber facing the first piston part relative to the material of the second piston part has a higher strength and temperature resistance
  • the material of the second, the combustion chamber facing away from the piston part has a lower density compared to the material of the first piston part and thus characterized by a very low weight.
  • the piston collar is provided in the first piston part with a heat-resistant gene coating, especially ceramic.
  • a first connection technique for the two piston parts is proposed that the two piston parts are connected by a shrink connection, and that the materials of the two piston parts different Have thermal expansion coefficients, such that with an increase in the temperature increased strength of the shrink joint is caused.
  • Such an increased strength of the shrink-fit connection can be achieved, for example, by the piston part having a greater coefficient of thermal expansion having a radially circumferential web which engages in a correspondingly shaped groove, bore or shoulder on the piston part having a lower coefficient of thermal expansion.
  • the web-shaped region of the first-mentioned piston part therefore expands more than the region of the second piston part, whereby an increased radially acting stress and thus an increased strength is achieved between the two piston parts.
  • a piston according to the invention can be used particularly advantageously in directly injecting internal combustion engines, in particular self-igniting internal combustion engines. use machines. Due to the relatively high injection pressures occurring in such internal combustion engines, for example injection pressures of more than 1800 bar, the recess having an undercut makes it possible to carry out a particularly effective combustion process.
  • FIG. 1 shows a longitudinal section through a piston according to the invention for a
  • FIG. 2 is a perspective view of a lower piston part, as used in the piston of FIG. 1,
  • FIG. 3 is a perspective view of an upper piston part, as used in a piston of FIG. 1,
  • FIG. 4 is a longitudinal section through a comparison with FIG. 1 modified
  • Fig. 5 shows a detail of Fig. 4 in an enlarged view
  • Fig. 6 shows a modified piston, in which the two piston parts consist of the same material, in longitudinal section.
  • FIG. 1 shows a piston 10 according to the invention for use in a preferably direct-injection internal combustion engine, in particular a self-igniting internal combustion engine.
  • the piston 10 has two the connected piston parts 11, 12 on.
  • the two piston parts 1 1, 12 are connected to each other in relation to a longitudinal axis 13 of the piston 10 in a horizontal parting plane 17.
  • the piston 10 has, on the side facing a fuel injector, not shown, a recess 14 which has an approximately circular inlet region 15 which widens radially in the direction of the longitudinal axis 13 to the second piston member 12 in the manner of an undercut.
  • the piston collar 21 delimiting the inlet region 15 can be provided, at least in regions, with a coating which preferably consists at least essentially of ceramic and which can not be seen in the figures.
  • the recess 14 On the side facing the second piston part 12, the recess 14 has, for example, a slightly conical piston crown 16. With regard to the exact geometric design of such a recess 14 on a piston 10, reference is made to the subsequently published DE 10 201 1090 005 A1 of the Applicant, which is intended to be part of this application.
  • the parting plane 17 between the two piston parts 11, 12 comprises two annular regions 18, 19 which are connected to one another via a connection section 20 arranged parallel to the longitudinal axis 13.
  • the region 19 is arranged with respect to the longitudinal axis 13 in the height of the recess 14 and opens radially in this. In the illustrated embodiment, the region 19 extends approximately in the middle height of the recess 14.
  • the second piston member 12 has a radially encircling web 22.
  • the two piston parts 1 1, 12 are preferably made of different materials.
  • the first piston part 11 is made of a material which has greater strength and greater heat resistance than the material of the second piston part 12. Steels or alloyed steels are used in particular.
  • the second piston part 12 is made of a material which has a lower density than the material of the first piston part 11.
  • the two piston parts 1 1, 12 are connected to each other in a first embodiment of the invention by means of a shrink connection in the region of the web 22.
  • the first piston part 11 comprises the second piston part 12 in the region of the web 22 with a portion 23 radially.
  • the screw connection 24 comprises, by way of example, six screws 25 arranged on a common bolt circle, which connect the two piston parts 11, 12 to one another axially using locking edge rings 26.
  • the screw connection 24 comprises, by way of example, six screws 25 arranged on a common bolt circle, which connect the two piston parts 11, 12 to one another axially using locking edge rings 26.
  • the first piston part 1 1 each have a threaded bore 27, and in the second piston part 12, a through hole 28 is formed.
  • the screws 25 are insertable from the side of the second piston part 12 forth in the direction of the threaded bores 27 and radially within the two
  • Piston parts 11, 12 arranged.
  • the longitudinal axes of the screws 25 are parallel to the longitudinal axis 13 of the piston 10th
  • the first piston part 11, on a front face 29 arranged in operative connection with the second piston part 12, has a radially encircling biting edge 30 which, when a material is used for the second piston part 12, the softer than the material of the first piston part 1 1 in forming the
  • Screwed 24 in the opposite end face 31 of the second piston member 12 digs.
  • the biting edge 30 is arranged close to the recess 14, so that the screws 25 are arranged radially outside the biting edge 30.
  • a welded joint can be used instead of the screw 24 between the two piston parts 1 1, 12.
  • These welded joints If necessary, in addition to the mentioned shrinkage connection between the two piston parts 1 1, 12 can be used.
  • the welded joint comprises, as will be shown only in FIG. 4 in the left side of the figure, a radially encircling weld 33, which is formed on the outside of the piston 10 in the region of the parting plane of the two piston parts 11, 12 by way of example. Of course, it is within the scope of the invention to arrange such a weld 33 at a suitable location, in particular not on the outer circumference of the piston 10.
  • FIG. 6 shows a modified embodiment of the invention is shown with a piston 10a, in which both piston parts 11a, 12a made of one and the same material, in particular aluminum.
  • the first piston part 11 a is formed as an insert in the second piston part 12 a.
  • the second piston part 12a has a recess with a bore section 34 in the manner of a counterbore, so that a radially encircling edge region 35 and a bore base 36 are formed on the second piston part 12a, which at the same time forms the parting web 17.
  • the bore base 36 is arranged approximately in the middle height of the recess 14.
  • the first piston part 1 1a is arranged to form a shrink connection.
  • an additional screw 24a is provided with screws 25a, which clamps the two piston parts 11a, 12a axially with each other.

Landscapes

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

Abstract

L'invention concerne un piston (10; 10a) pour un moteur à combustion interne, comprenant une première partie (11; 11a) de piston présentant un culot (16) de piston et une deuxième partie (12; 12a) de piston reliée à la première partie (11; 11a) de piston. Selon l'invention, le culot (16) de piston est disposé dans la première partie (11: 11a) de piston dans la région d'un évidement (14) présentant une contre-dépouille et les deux parties (11; 11a; 12; 12a) de piston sont reliées ensemble dans un plan de séparation (17) horizontal qui est disposé en partie à hauteur de l'évidement (14) par rapport à un axe longitudinal (13).
PCT/EP2013/063671 2012-06-29 2013-06-28 Piston pour un moteur à combustion interne WO2014001523A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102012211294 2012-06-29
DE102012211294.4 2012-06-29
DE102012213532.4A DE102012213532A1 (de) 2012-06-29 2012-08-01 Kolben für eine Brennkraftmaschine
DE102012213532.4 2012-08-01

Publications (2)

Publication Number Publication Date
WO2014001523A2 true WO2014001523A2 (fr) 2014-01-03
WO2014001523A3 WO2014001523A3 (fr) 2014-03-20

Family

ID=49754189

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2013/063671 WO2014001523A2 (fr) 2012-06-29 2013-06-28 Piston pour un moteur à combustion interne

Country Status (2)

Country Link
DE (1) DE102012213532A1 (fr)
WO (1) WO2014001523A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT519583B1 (de) * 2017-01-26 2018-11-15 Mahle Koenig Kg Gmbh & Co Kg Kolben zum Einsatz in Verbrennungskraftmaschinen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19621635B4 (de) 1996-05-30 2004-02-05 Audi Ag Diesel-Brennkraftmaschine
DE102004028459A1 (de) 2004-06-11 2005-12-29 Mahle Gmbh Gebauter Kolben für einen Verbrennungsmotor
DE102011090005A1 (de) 2011-12-28 2013-07-04 Robert Bosch Gmbh Direkteinspritzende Brennkraftmaschine und Kraftstoffeinspritzventil

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1207152B (de) * 1959-10-02 1965-12-16 Schmidt Gmbh Karl Fluessigkeitsgekuehlter Kolben geschmiedeter oder gepresster Ausfuehrung fuer Brennkraftmaschinen
DE3932563A1 (de) * 1989-09-29 1991-04-11 Kolbenschmidt Ag Leichtmetallkolben fuer verbrennungskraftmaschinen
DE10128737B4 (de) * 2001-06-13 2005-08-18 Federal-Mogul Nürnberg GmbH Kolben mit dispersionsgehärtetem Kolbenoberteil
US9970384B2 (en) * 2009-11-06 2018-05-15 Federal-Mogul Llc Steel piston with cooling gallery and method of construction thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19621635B4 (de) 1996-05-30 2004-02-05 Audi Ag Diesel-Brennkraftmaschine
DE102004028459A1 (de) 2004-06-11 2005-12-29 Mahle Gmbh Gebauter Kolben für einen Verbrennungsmotor
DE102011090005A1 (de) 2011-12-28 2013-07-04 Robert Bosch Gmbh Direkteinspritzende Brennkraftmaschine und Kraftstoffeinspritzventil

Also Published As

Publication number Publication date
WO2014001523A3 (fr) 2014-03-20
DE102012213532A1 (de) 2014-01-02

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