Composite cylinder block

Abstract

A cylinder block (1) includes a main block body (2) made of a metal material and an outer member (3) made of a resin material and welded to the main block body (2). The main block body (2) has a cylinder wall (13) defining therein a cylinder bore (16) and a second columnar part (14B) formed at a position apart from the cylinder wall (13). The outer member (3) has a second columnar part insertion hole (53) and defines a water jacket between the outer member (3) and the cylinder wall (13). The second columnar part (14B) is placed in the second columnar part insertion hole (53) with a predetermined clearance left between the second columnar part insertion hole (53) and the second columnar part (14B), in a state of being isolated from the water jacket, and extends to a cylinder head.

Dependencies are inferred from the claim text.