Design simulation of meshing, tooth contact analysis, and stress analysis of spur and helical gear drives with low levels of noise and improved bearing contact (Spanish text)

New methods of design and manufacture of enhanced spur and helical gear drives with low levels of noise and vibration are proposed. Involute gears are modified by double crowning of tooth surfaces in order to: (i) localize the bearing contact, and (ii) predesign a parabolic function of transmission errors. Localization of the bearing contact allows us to avoid edge contact when missalignments occur. A parabolic function of transmission errors allows the almost lineal functions of transmission errors caused by missalignments to be absorbed. Three methods of generation are proposed based on: (i) plunging of a grinding disk, (ii) plunging of a grinding worm, and (iii) modified roll during the feed motion of the grinding worm. Simulation of meshing and tooth contact analysis show the advantages of the new geometry of modified involute gears for the purpose of reduction of noise and vibration. Stress analysis is performed using the finite element method and shows as well the advantages of application of modified involute gears.; Canonical design of crossed involute helical gears is introduced as a new concept of design that provides an optimal localization of the bearing contact on tooth surfaces. The shift of the bearing contact is determined through an analytical method that calculates the shift of the line of action as a function of the crossing angle and errors of alignment.; Two versions of geometry of face-gear drives with helical pinion are considered based on: (i) a screw involute helicoid, and (ii) a new geometry developed as envelopes of two mismatched parabolic racks of the pinion and the shaper. A method of grinding or cutting by a worm of the face gear has been also developed. Generation of the grinding worm with surfaces free of singularities is considered. Tooth contact analysis and stress analysis show the following advantages for the proposed geometry: (a) existence of a longitudinal bearing contact, (b) avoidance of edge contact, and (c) reduction of contact stresses. A phenomenon of asymmetry of tooth bearing contact for the driving and coast sides has been discovered.