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1. US20120192828 - Multi-part piston for an internal combustion engine and method for the production thereof

Office United States of America
Application Number 13383682
Application Date 29.06.2010
Publication Number 20120192828
Publication Date 02.08.2012
Grant Number 08991046
Grant Date 31.03.2015
Publication Kind B2
IPC
B23P 15/10
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
POTHER WORKING OF METAL; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
15Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
10pistons
F02F 3/00
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
FCYLINDERS, PISTONS, OR CASINGS FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
3Pistons
F02B 23/06
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
23Other engines characterised by special shape or construction of combustion chambers to improve operation
02with compression ignition
06the combustion space being arranged in working piston
CPC
F02F 3/003
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
3Pistons
0015Multi-part pistons
003the parts being connected by casting, brazing, welding or clamping
F02B 23/0672
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
23Other engines characterised by special shape or construction of combustion chambers to improve operation
02with compression ignition
06the combustion space being arranged in working piston
0672Omega-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
F02B 23/0693
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
23Other engines characterised by special shape or construction of combustion chambers to improve operation
02with compression ignition
06the combustion space being arranged in working piston
0678Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets
0693the combustion space consisting of step-wise widened multiple zones of different depth
Y02T 10/125
Y10T 29/49252
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
29Metal working
49Method of mechanical manufacture
49229Prime mover or fluid pump making
49249Piston making
49252Multi-element piston making
Y10T 29/49256
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
29Metal working
49Method of mechanical manufacture
49229Prime mover or fluid pump making
49249Piston making
49256with assembly or composite article making
Applicants Joachim Schulz
MAHLE International GmbH
Jochen Kortas
Inventors Joachim Schulz
Jochen Kortas
Agents Collard & Roe, P.C.
Priority Data 10 2009 032 941 14.07.2009 DE
Title
(EN) Multi-part piston for an internal combustion engine and method for the production thereof
Abstract
(EN)

The present invention relates to a method for producing a multi-part piston (10, 110) for an internal combustion engine, comprising the following method steps: producing an upper piston part (11) and a lower piston part (12), each having an inner support element (22, 26; 122, 126) having joining surfaces (24, 28; 124, 128) and an outer support element (23, 27; 123, 127) having joining surfaces (25, 29; 125, 129), applying a high-temperature solder material in the area of at least one joining surface (24, 28 or 25, 29; 124, 128 or 125, 129), assembling the upper piston part (11) and the lower piston part (12) to form a piston body by establishing a contact between the joining surfaces (24, 28 or 25, 29; 124, 128 or 125, 129), placing the piston body in a vacuum furnace and evacuating the vacuum furnace; heating the piston body at a pressure of at most 10−2 mbar to a soldering temperature of at most 1300° C.; cooling the soldered piston (10, 110) at a pressure of at most 10−2 mbar until the high-temperature solder material is completely solidified. The present invention further relates to a piston (10, 110) that can be produced by means of the method.