INVOLUTE GEARING Russian patent published in 2000 - IPC

FIELD: mechanical engineering. SUBSTANCE: involute gearing has gear and wheel with shifted initial contour caused by profiling interference. Diameter of lower point of gear tooth involute profile is equal to diameter of gear main circumference due to selection of shifting coefficient of initial contour by dependence x₁= d_b1-(d₁-2h*a

•m)/2m, where d_b1 is diameter of gear main circumference; d₁ is gear pitch diameter; h*a= 1 is coefficient of depth of gear tooth head; m is gearing modulus. Shifting coefficient is rounded off in direction of smaller values up to first sign after point. Radial clearance between surfaces of gear tooth spaces and wheel tooth points is enlarged by half the shift of gear initial contour due to reduction of rated diameter of wheel tooth points. In this case, actual diameter of wheel tooth points is determined by dependence d_a2act= d₂+m[2(h*a+x₂)-x₁], where d₂ is wheel pitch diameter; x₂ is shifting coefficient of wheel initial contour. EFFECT: enhanced durability and load- carrying capacity. 1 dwg