EP 0327595 B1 19900425 - SINGLE-PIECE, LIGHTWEIGHT AND LOW-FRICTION LIGHT-METAL PISTON FOR INTERNAL COMBUSTION ENGINES
Title (en)
SINGLE-PIECE, LIGHTWEIGHT AND LOW-FRICTION LIGHT-METAL PISTON FOR INTERNAL COMBUSTION ENGINES
Publication
Application
Priority
DE 3644188 A 19861223
Abstract (en)
[origin: WO8804724A1] The technical problem is to reduce the operating noise of such a piston. It is solved by means of a piston having the following dimensions: a) A = (0.45-0.65) D; b) H = (0.25-0.4) D; c) A = (0.3-0.4) D; d) A greater than or equal to B; e) T = (0.45-0.8) D; f) the piston ribs between the annular grooves (2, 3, 4) and the rod region with a very narrow operating clearance have, in the case of a hot operating piston, approximately the same clearance in relation to the cylinder operating path. An additional improvement consists in inserting an annular jacket in the piston head in the radial region behind the annular grooves, said jacket consisting of a material having a thermal expansion factor less than that of the basic piston material. In a hot operating internal combustion engine, the piston has, in the region of the ribs, a clearance which, in the direction pressure/counter-pressure reaches approximately only 3-5 times the clearance in the very narrow clearance region of the piston rod.
IPC 1-7
IPC 8 full level
F02F 3/00 (2006.01); F02F 3/02 (2006.01); F02F 3/08 (2006.01); F16J 1/00 (2006.01)
CPC (source: EP US)
F02F 3/02 (2013.01 - EP US); F02F 3/08 (2013.01 - EP US); F02F 2200/06 (2013.01 - EP US); F05C 2201/021 (2013.01 - EP US); F05C 2201/0448 (2013.01 - EP US); F05C 2251/042 (2013.01 - EP US)
Citation (examination)
DE 1078387 B 19600324 - SCHMIDT GMBH KARL
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
WO 8804724 A1 19880630; BR 8707926 A 19891031; DE 3762445 D1 19900531; EP 0327595 A1 19890816; EP 0327595 B1 19900425; JP 2716492 B2 19980218; JP H02501758 A 19900614; US 5048398 A 19910917
DOCDB simple family (application)
DE 8700593 W 19871216; BR 8707926 A 19871216; DE 3762445 T 19871216; EP 88900342 A 19871216; JP 50050788 A 19871216; US 36829889 A 19890607