Gears

This book explores the geometric and kinematic design of the various types of gears most commonly used in practical applications, also considering the problems concerning their cutting processes. The cylindrical spur and helical gears are first considered, determining their main geometric quantities in the light of interference and undercut problems, as well as the related kinematic parameters. Particular attention is paid to the profile shift of these types of gears either generated by rack-type cutter or by pinion-rack cutter. Among other things, profile-shifted toothing allows to obtain teeth shapes capable of greater strength and more balanced specific sliding, as well as to reduce the number of teeth below the minimum one to avoid the operating interference or undercut. These very important aspects of geometric-kinematic design of cylindrical spur and helical gears are then generalized and extended to the other examined types of gears most commonly used in practical applications, such as straight bevel gears; crossed helical gears; worm gears; spiral bevel and hypoid gears. Finally, ordinary gear trains, planetary gear trains and face gear drives are discussed.

LOAD CARRYING CAPACITY OF SPUR AND HELICAL GEARS: INFLUENCE FACTORS AND LOAD ANALYSIS.- SURFACE DURABILITY (PITTING) OF SPUR AND HELICAL GEARS.- TOOTH BENDING STRENGTH OF SPUR AND HELICAL GEARS.- LOAD CARRYING CAPACITY OF BEVEL GEARS: FACTORS INFLUENCING LOAD CONDITIONS.- SURFACE DURABILITY (PITTING) OF BEVEL GEARS.- TOOTH ROOT STRENGTH OF BEVEL GEARS.- SCUFFING LOAD CARRYING CAPACITY OF CYLINDRICAL, BEVEL AND HYPOID GEARS.- SCUFFING LOAD CAPACITY OF CYLINDRICAL, BEVEL AND HYPOID GEARS: INTEGRALTEMPERATURE METHOD.- WEAR LOAD CAPACITY RATING OF GEARS.- MICROPITTING LOAD CAPACITY OF SPUR AND HELICAL GEARS.- TOOTH FLANK BREAKAGE LOAD CARRYING CAPACITY OF SPUR AND HELICAL GEARS.