An internal combustion engine (1) having: a crankshaft (3); camshafts (37) that activate intake and exhaust valves; an auxiliary shaft (7), which rotates in an opposite direction with respect to the crankshaft (3) and is unbalanced so as to act as balancin...

A V-type block of a crank circular slider mechanism, comprising a piston with a circular slider receiving hole and a circular slider received in the receiving hole, the block having a main journal hole and comprising a group of adjacent cylinders arranged ...