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US 2006/0048911 A1Published application
Cylinder bore liners for cast engine cylinder blocks
AssigneeGeneral Motors Corporation
InventorThomas Newcomb
Life of this patent
Estimating the term…
Abstract
A cast-in-place cylinder bore liner (15) is disclosed for use in sand casting of engine cylinder blocks, the cylinder bore liner (15) having a protuberant portion (60) adjacent a first end (61) thereof, whereby accuracy in the positioning of cast-in-place bore liners (15) is maximized.
Claims18
A cast-in-place cylinder bore liner for forming a cylinder wall in an engine block comprising:
- a hollow cylindrical main body (15) having a substantially circular cross section, a first end (61), and a second end (65), the first end (61) of said main body (15) having a radially inwardly extending protuberant portion (60) formed thereon to facilitate an alignment of said main body (15) on an associated cylinder barrel (50), an inner wall (62) of said main body (15) having a substantially uniform diameter.
A mold for sand casting of engine cylinder blocks comprising:
- at least one cylinder barrel (50) extending outwardly from a base end (47) to terminate at a free end (51), an outer wall (49) of said at least one cylinder barrel (50) being tapered from the base end (47) to the free end (51);
- and
- a bore liner (15) having a substantially circular cross section, a first end (61), and a second end (65), said bore liner (15) disposed on said at least one cylinder barrel (50), the first end (61) of said bore liner (15) having a radially inwardly extending protuberant portion (60) formed thereon to facilitate an alignment of said bore liner (15) on said cylinder barrel (50), an inner wall (62) of said bore liner (15) being non-tapered in an axial direction of said bore liner (15).
A mold for sand casting of engine cylinder blocks comprising:
- an integral barrel crankcase core (14) adapted to be assembled in a mold package (10), said integral barrel crankcase core (14) including a crankcase core region (52);
- a plurality of spaced apart cylinder barrels (50) arranged to form at least one row and extending outwardly from a base end (47) disposed on the crankcase core region (52) to terminate at a free end (51);
- and
- a plurality of hollow cast-in-place bore liners (15) having a substantially circular cross section, a first end (61), and a second end (65), one of said bore liners (15) disposed on each of said cylinder barrels (50), the first end (61) of said bore liners (15) having a radially inwardly extending protuberant portion (60) formed thereon to facilitate an alignment of said bore liners (15) on said cylinder barrels (50), an inner wall (62) of said bore liners (15) being non-tapered in an axial direction of said bore liners (15).
1 more element
Dependencies are inferred from the claim text.