Casting with optimal bearing surfaces for receiving a mechanical tightening element such as a screw or washer

摘要

The casting (1) comprises an optimal bearing surface that receives a screw or disc type machine tightening element intended for fixing a member of an opening (2) of the casting and is registered in an annular zone forming a circumference of the opening. The optimal bearing surface is made of three supports (11-13) distributed in the annular zone, where each support is in a form of an annular segment. The annular segments are distributed angularly at angle of lower than 45[deg] in a regular way. The casting is produced by a molding method such as lost pattern. The casting (1) comprises an optimal bearing surface that receives a screw or disc type machine tightening element intended for fixing a member of an opening (2) of the casting and is registered in an annular zone forming a circumference of the opening. The optimal bearing surface is made of three supports (11-13) distributed in the annular zone, where each support is in a form of an annular segment. The annular segments are distributed angularly at angle of lower than 45[deg] in a regular way. The casting is produced by a molding method such as lost pattern. The casting integrates with a water outlet case of an engine in a single-piece manner. The optimal contact surface is a surface of the water outlet case for supporting a plate for fixing a housing of a thermostat controlled water outlet.