BALANCING DEVICE FOR A PISTON IN-LINE TWO-CYLINDER FOUR-STROKE INTERNAL COMBUSTION ENGINE Russian patent published in 2023 - IPC F16F15/26 

FIELD: engine building.

SUBSTANCE: balancing device is designed for balancing a piston in-line two-cylinder four-stroke internal combustion engine by means of a group of counterweights. The device does not have balance shafts. At least one of the counterweights (5) with a weight m_kr_k is placed on the crankshaft of the engine. Two other counterweights (6), (7) with weights m_b1r_b1 and m_b2r_b2 are placed on the disks of two gears (2), (4) not directly connected to each other, driven from the crankshaft (8), rotating with the same angular velocity in the opposite direction. The axes of the gears (2), (4) are parallel to the crankshaft (8) and offset relative to it by the given values "a" vertically and "b" horizontally. The values "a" and "b" are determined by modelling based on the values of the mass moving back and forth, the radius of the crankshaft crank (8) R, the rotational speed and the resulting impulse of the overturning moment over a period of 360°. The position of the centres of mass of all counterweights corresponds to the angle ϕ of turning the crankshaft crank (8). The weight of the crankshaft (8) m_kr_k is produced using "n" separate counterweights, the values of which are determined based on the condition: Σⁿ_i=1m_ir_i = m_kr_k, Σⁿ_i=1m_ir_ix_i = 0, where m_ir_i are weights of individual counterweights, x_i is the distance from the centre of mass of said counterweights to a plane perpendicular to the axis of the crankshaft passing through the middle of the distance between the axes of the cylinders. The ratio of weight values (6) and (7) m_b1r_b1 and m_b2r_b2 is such that their common centre of mass is also in the same plane, which corresponds to the condition: m_b1r_b1x ₁ = m_b2r_b2x₂, where x₁ and x₂ are the distances from the centres of mass of the counterweights to this plane. The weight values are determined based on the weight and size parameters of a particular balanced motor from the conditions: m_b1r_b1 + m_b2r_b2 = m_kr_k and m_kr_k = M×R where: R is the crank radius of the crankshaft (8), M is the value of the mass of the crank mechanism of one engine cylinder moving back and forth.

EFFECT: ensuring balancing of the forces of inertia of the 1st order from the masses moving back and forth and the precise implementation of the optimal partial balancing of the reactive torque.

2 cl, 3 dwg