Patent ID: 6415848
Filing Date: 2002-07-09
Classification: B22D,F02B,F02F,F05C

Abstract:
A metal mold arrangement for producing a closed deck type cylinder block made from an aluminum alloy, the cylinder block having a plurality of cylinder bores juxtaposed with each other to form a cylinder array and formed with a water jacket surrounding the cylinder array, the cylinder block also having a top deck at which one end of the water jacket is define as an open end, a plurality of bridge portions partly covering the open end, and a crankcase side end face opposite the top deck; the arrangement comprising:a cylinder block forming die including at least a first wall portion defining a configuration of the top deck, a cylindrical protruding sections for defining an inner configuration of the cylinder block, a second wall portion defining a configuration of the crankcase side face, and a water jacket die portion positioned to surround the cylindrical protruding sections for defining a configuration of the water jacket, the water jacket die portion being formed with a plurality of recesses extending in an axial direction of the cylinder bores and opening at the crankcase side face, each recess being a rectangular shape having a pair of side wall surfaces, an opening positioned at the crankcase side face, and a bottom wall surface opposite the opening, the bottom wall surface extending in a direction intersecting with the axial direction and oblique to a direction of the array of the cylinders, the bottom surface being partly open to the first wall portion; and, a plurality of separate cores each having a solid structure and made from a metal and having a rectangular shape complementary to each recess, each single one of the separate cores being insertable into each recess in the axial direction from its opening, each separate core having a top deck side slant end face serving as a first draft and a crankcase side slant end face serving as a second draft, the top deck side face and the crankcase side face being slanted in opposite direction against each other such that a distance between the top deck side slant end face and the crankcase side slant end face in the axial direction of the cylinder is gradually increased toward a circumferential direction of the cylinder, an inclination of the bottom wall surface of each recess being coincident with an inclination of the top deck side slant end face.