Global Patent Index - EP 0432810 B1

EP 0432810 B1 19940119 - Pressure cast light metal piston for internal combustion engines.

Title (en)

Pressure cast light metal piston for internal combustion engines.

Title (de)

Pressgegossener Leichtmetallkolben für Verbrennungskraftmaschinen.

Title (fr)

Piston à métal léger, coulé sur pression, pour un moteur à combustion interne.

Publication

EP 0432810 B1 19940119 (DE)

Application

EP 90202262 A 19900822

Priority

DE 3937616 A 19891111

Abstract (en)

[origin: JPH03194157A] PURPOSE: To improve durability by forming a piston with high-temperature magnesium alloy, by providing its skirt with a chemically applied or electrodeposited metallic sliding layer which has given thickness and hardness, and by coating the inside surface of the piston with a plastic cracker. CONSTITUTION: A piston 1 is formed with pressure-diecast of magnesium alloy belonging to a material group Mg5Nd, a skirt reinforced by 20 vol.% of aluminum oxide fiber is coated with a chemically applied nickel layer (sliding layer) 3 which has a thickness of about 10-30 μm (preferably 16-24 μm) and a hardness of about 740-850 HV0.01 . The inside surface of the piston 1 is coated with a layer 2 formed with a plastic cracker having a thickness of 15 μm. Particles of chromium oxide or similar ceramic oxide material is buried in the sliding layer 3, and the magnesium alloy 2 contains 2-6% of neodymium.

IPC 1-7

F02F 3/10; F02F 7/00; F02B 77/02

IPC 8 full level

F02F 3/00 (2006.01); B22D 18/00 (2006.01); B22D 19/08 (2006.01); C22C 23/06 (2006.01); C22C 47/00 (2006.01); C22C 49/00 (2006.01); C22C 49/04 (2006.01); C22C 49/06 (2006.01); C23C 30/00 (2006.01); F02B 77/02 (2006.01); F02F 3/10 (2006.01); F02F 7/00 (2006.01); F16J 1/01 (2006.01); F16J 1/02 (2006.01)

CPC (source: EP US)

C22C 23/06 (2013.01 - EP US); C22C 49/04 (2013.01 - EP US); C23C 30/00 (2013.01 - EP US); F02F 3/10 (2013.01 - EP US); F02F 2200/04 (2013.01 - EP US); F05C 2201/021 (2013.01 - EP US); F05C 2201/028 (2013.01 - EP US); F05C 2201/043 (2013.01 - EP US); F05C 2251/042 (2013.01 - EP US); F05C 2253/16 (2013.01 - EP US)

Citation (examination)

Designated contracting state (EPC)

DE

DOCDB simple family (publication)

DE 3937616 A1 19910516; DE 59004332 D1 19940303; EP 0432810 A1 19910619; EP 0432810 B1 19940119; JP H03194157 A 19910823; US 5063894 A 19911112

DOCDB simple family (application)

DE 3937616 A 19891111; DE 59004332 T 19900822; EP 90202262 A 19900822; JP 30587490 A 19901109; US 60929490 A 19901105