Design of the limit profile of crankshaft balancer for 12V190 gas engine
To solve the difficulty in designing the shape of the balance block caused by the need to increase the mass-semidiameter of the crankshaft balance block when increasing the stroke of a 12V190 gas internal combustion engine,the displacement formula of the piston relative to the balance block is derived,and the motion envelope of the piston skirt bottom is drawn to determine the limit contour of the balance block.Use 3D software for motion simulation to verify the correctness of the limit contour of the balance block.The results indicate that the bottom of the piston group and the balance block do not interfere and are tightly fitted.According to the structure of the 12V190 gas internal combustion engine and the processing technology of the balance block,the limit outer contour of the balance block is modified from an ellipse to a circular arc,and an avoidance arc is designed at the bottom of the piston to shift the center of gravity of the balance block outward and obtain a larger mass diameter product.
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