| 摘要 |
FIELD: mechanical engineering. SUBSTANCE: design parameters of engagement of spur gears are modified to decrease level of vibration in gear train caused by nonuniform thermal expansion of gearbox housing. Chordal addendum in engaged spur gears is increased by definite value basing on calculated relative radial displacement of its axes caused by nonuniform thermal expansion to create modified meshing of increased outer diameter spur gears. Such meshing provides effective axial distance in drive, and tooth overlap factor in engaged spur gears at engine starting exceeds design factor. With gear drive run-in, working tooth overlap factor of spur gears becomes practically equal to design factor at the cost of nonuniform thermal expansion of gearbox housing. Moreover, angle of helix line of action of spur gears is materially increased to counteract influence of nonuniform thermal expansion of gearbox housing. EFFECT: enhanced operation reliability. 6 dwg |
