Patent ID: 6945213
Filing Date: 2005-09-20
Classification: F02B,F02F

Abstract:
1. A cylinder block of a multicylinder engine, comprising: a cylinder main body; a plurality of cylinder bores provided in said cylinder main body in parallel in an axial direction of a crankshaft, each of said cylinder bores having a piston slide surface to slide a piston in an inner periphery thereof; a crankcase having a plurality of journal walls rotatably supporting at least a half part of said crankshaft, said crankcase being integrally provided with said cylinder main body; a plurality of communication holes provided in said cylinder main body and said crank case and extending in parallel to the axial line of said crankshaft while at least a part of one of the plurality of communication holes is opened in an inner periphery of each of said plurality of cylinder bores; and a cut-processed member, said cut-processed member being formed expanding outward from said piston slide surface and along a radial direction of the plurality of cylinder bores and in at least a portion of an inner surface of each of said plurality of cylinder bores in a direction of said piston at an open edge of one of said plurality of communication holes, wherein upper most edges of the plurality of communications holes are below the position where the cut-processed member extends outward from said piston slide surface.