Piston for a combustion engine and casting method for the...

Details Piston for a combustion engine and casting method for the... Piston for a combustion engine and casting method for the...

2007-05-08

2007-05-08

McMahon, Marguerite (Department: 3747)

Internal-combustion engines

Particular piston and enclosing cylinder construction

Piston

C123S041350, C164S132000, C029S888047

Reexamination Certificate

active

10559884

ABSTRACT:
The invention relates to a piston (1), which is comprised of an approximately circular cylindrical upper area (5) and of a lower area (6), having two hubs (7), which are set back toward the piston central axis (8) so that, in the upper area (5), recesses (12, 12′) can be made, which are open toward the lower area (6), in the vicinity of the hubs (7). In order to make relief cuts (13, 13′) in the area between the hubs (7) and the upper area (5), a salt mold part (15) is placed on the respective window insert (14). The salt mold part (15) serves to produce the recesses (12, 12′) as well as the relief cuts (13, 13′) when casting the piston (1) and is washed out after the piston (1) has been cast.

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