In a multi-cylinder reciprocating internal combustion engine, an optimal angle of crank arrangement that reduces vibrating force caused in the engine is obtained. Where Fm is the sum of an unbalanced force of order m that acts as vibrating force in the mul...

In order to suppress axial vibration in a crank system, prevent knocking sound, and reduce vibration noise, a flywheel (1) which is mounted onto the crankshaft of an engine (E) is made into a spoked form having an uneven number of spokes (5). This prevents...

A rotor has a main body (42). A weight guide (45, 49, 51, 53, 55, 57) is recessed in the main body (42). A weight accommodated in the weight guide contacts with and rolls on a weight guiding surface. The weight swings like a pendulum about a second axis th...

The engine has a crankshaft with n crank throws connected to pistons, and arranged in set angle positions to form a crank star. The throws are located in the star in such a way, that the firing sequence belonging to this star, among all possible firing seq...