Abstract: The present invention relates to internal combustion engines, particularly to a reciprocating piston type internal combustion engine with a crank and multiple circular slide blocks, formed by substituting connecting rods with circular slide blocks. The engine comprises a crank-and-circular slide block mechanism including a cylinder body, pistons, circular slide blocks, a crankshaft and the like. In the cylinder body, there is a sliding track in which there is a dynamic balance sliding piece. There are at least three circular slide blocks connected into an integral, with the phase difference of the adjacent circular slide blocks being 180.degree., and the circular slide blocks being rotably received in the pistons or the dynamic balance sliding piece and all being sleeved on the same crank pin.

Abstract: The invention relates to a internal-combustion engine, particularly to a reciprocating piston type internal combustion engine having a crank circular slide block which replaces the connecting rod. It comprises the cylinder body; the cylinder, the piston, the crankshaft and the crank circular slide block mechanism with a circular slide block (27) which connects the piston with the crankshaft; a valve actuating mechanism; and a fuel supply system. In the cylinder body there are provided a dynamic balance sliding piece which moves reciprocatingly along a sliding track and a circular slide block (28) which connects the dynamic balance sliding piece with the crankshaft and has 180 degree of phase difference related to the circular slide block and is formed integrally with the circular slide block. The sliding track and the dynamic balance sliding piece can be formed as the structure of cylinder and piston.