BALANCING DEVICE FOR A PISTON IN-LINE TWO-CYLINDER FOUR-STROKE INTERNAL COMBUSTION ENGINE Russian patent published in 2022 - IPC F16F15/26 

FIELD: internal combustion engines.

SUBSTANCE: invention can be used in internal combustion engines. The balancing device of a piston in-line two-cylinder four-stroke internal combustion engine is carried out by means of a group of counterweights, at least one of which, with an imbalance M₀r₀, is connected to the crankshaft of the engine, and the other two - with imbalances (2), (5) M₁r₁ and M₂r₂ - one on each of two balancing shafts kinematically connected with the crankshaft with the possibility of rotation with the same angular velocity in the opposite direction. The balancing shafts are placed symmetrically to the axis (7) of the crankshaft with a given vertical offset "a" of their axes. The centers of mass of all three counterweights are located in a plane perpendicular to the axis (7) of the crankshaft and passing through its middle, so that the position of the centers of mass of the counterweights of the balancing shafts corresponds to the angle φ of rotation of the crankshaft crank. The values of displacement "a" and imbalances M₁r₁, M₂r₂ and M₀r₀ are determined based on the condition M₁r₁ + M₂r₂ = M₀r₀ and M₀r₀ = MЧR, where R is the radius of the crankshaft crankshaft, M is the reciprocating mass of the crank mechanism of one engine cylinder. The counterweights of the balancing shafts are made with different imbalances (M₁r₁ ≠ M₂r₂) and, at the same time, the ratio of the values of these imbalances is sufficient to achieve optimal balancing of the reactive torque. The displacement values "a" of the shaft axes are determined according to the values of the mass of the reciprocating masses, the radius of the crank R, the rotational speed and the value of the engine torque for a period of 720°, the resulting impulse of the overturning moment for this period. The crankshaft imbalance M₀r₀ is obtained by using "n" counterweights. The values of the elements are determined from the condition:

,

where are the imbalances of individual counterweights, is the distance from the center of mass of the indicated elements to the plane perpendicular to the axis of the crankshaft and passing through its middle.

EFFECT: simplifying the process of realizing the balancing of a two-cylinder four-stroke engine.

1 cl, 1 dwg