Granted Patent B2

US 7,438,117 · App. 11/335,000 · Granted Oct 21, 2008

Abstract

Claims (27)

1. A vent window core comprising:

a main body adapted to be assembled with one of a crankcase chill and an integral barrel crankcase core of a mold package, said main body having a substantially planar lower surface;

a shoulder extending laterally outwardly from a side of said main body and at an angle with respect to the lower surface of the main body, a cross-sectional shape of said shoulder determining a final shape of a vent window formed in a bulkhead of an engine cylinder block, and wherein said shoulder has a length which is substantially equal to a desired depth of the window; and

a recess formed in an outer surface of said main body adjacent said shoulder, said recess formed by a semicircular upper wall and a substantially planar side wall and adapted to receive an extension of the crankcase chill therein when assembled in the mold package.

2. The vent window core according to claim 1 , wherein said shoulder is disposed at an angle of 45 degrees with respect to the lower surface.

3. The vent window core according to claim 1 , including a transition section disposed between said main body and said shoulder.

4. The vent window core according to claim 3 , wherein an outer surface of said transition section is rounded.

5. The vent window core according to claim 1 , wherein said shoulder has an elongated substantially oval cross-sectional shape.

6. A mold package for casting of an engine cylinder block comprising:

a crankcase chill;

an integral barrel crankcase core adapted to be disposed on said crankcase chill; and

a vent window core adapted to be disposed between said crankcase chill and said integral barrel crankcase core, said vent window core further comprising:

a main body having a substantially planar lower surface;

a shoulder extending laterally outwardly from a side of said main body and at an angle with respect to the lower surface of the main body, a cross-sectional shape of said shoulder determining a final shape of a window formed in a bulkhead of an engine cylinder block; and

a recess formed in an outer surface of said main body adjacent said shoulder, said recess formed by a semicircular upper wall and a substantially planar side wall and adapted to receive an extension of the crankcase chill therein.

7. The mold package according to claim 6 , wherein said shoulder is disposed at an angle of 45 degrees with respect to the lower surface.

8. The mold package according to claim 6 , including a transition section disposed between said main body and said shoulder.

9. The mold package according to claim 8 , wherein said transition section has a rounded outer surface.

10. The vent window core according to claim 6 , wherein said shoulder has an elongated substantially oval cross-sectional shape.

11. A method of producing a cylinder block casting, the method comprising the steps of:

providing a mold package;

providing a vent window core including a main body having a substantially planar lower surface, a shoulder extending laterally outwardly from a side of the main body and at an angle with respect to the lower surface of the main body, a shape of the shoulder determining a final shape of a window formed in a bulkhead of the engine cylinder block, and a recess formed in an outer surface of said main body adjacent said shoulder, said recess formed by a semicircular upper wall and a substantially planar side wall;

assembling the vent window core with the mold package;

filling the mold package with molten metal; and

removing the cylinder block casting from the mold package.

12. The method according to claim 11 , further comprising the step of assembling the vent window core in a crankcase chill prior to assembly with the mold package.

13. The method according to claim 11 , further comprising the step of assembling the vent window core in an integral barrel crankcase core prior to assembly with the mold package.

Assignments (12)