Balancing of three-cylinder engine through the action of reactive torque

The improvement of the balance of reciprocating internal combustion engines is an important task of improving the design, the solution of which allows to improve the environmental properties of the automobile by reducing vibration and noise. Perturbations from the action of overturning (reactive) torque are substantially different from the action of inertial forces and moments. Its common quantitative evaluation in existing methods of analysis is missing, which complicates a general analysis of the balance. The authors proposed to use as the same for all sources of imbalance the measures of perturbation value the maximum for the period of the pulse value, developed a software system that allow to perform such an assessment of unbalance for three-cylinder reciprocating engine type L3 with the specified weight and size characteristics and modes of operation. The mechanism is proposed to partially balance the reactive torque of the engine, the optimal parameters for the field of specified modes of operation was found. Using the developed complex the analytical quantification of unbalance from the action of overturning moment of three-cylinder engine with typical mass-dimensional parameters as when balancing with proposed method and without it was made. For a typical scheme of moment partial balancing of forces of inertia of the first order in considered engine the assessments of disturbances were made and their effect on different modes was studied. It was found out that in the engine of L3 type unbalance from the action of reactive torque at low and medium frequencies of rotation makes a major contribution to vibroactivity of engine surpassing in values of the impulse contribution from the residual unbalance from the moment of inertia of the first order inherent to typical designs. The mechanism allows to decrease this imbalance several times.

three-cylinder engine, engine balancing, overturning torque, engine torque, balancing mechanism, optimization of trim, quantitative assessment of balance, momentum perturbations