Fig. 17 Mating crossed-axes helical gears More

Fig. 1 Failure regions of industrial and automotive spur and helical gears. (a) Through hardened, 180-350 HB. (b) Precision gears, surface hardened More

Fig. 1.5 Offset parallel gearbox with (a) single and (b) double helical gears. (c) Epicyclic gearbox More

Fig. 1.11 Advantages and disadvantages of double helical gears More

Fig. 1.12 Schematic of apex runout in double helical gears More

Fig. 10 Sections of a helical gear (a) and a helical rack (b) More

Fig. 23.14 Helical gear cup formed using the MF-7500 [ Nakano, 1997 ] More

Fig. 4.43 Helical gear inductor. Source Ref 12 More

Fig. 21 Secondary stresses set up in associated parameters of a helical gear due to the side thrust action of the helix. Source: Ref 2 More

Fig. 34 Honing of helical gear teeth More

Fig. 3.68 Extruded bars with helical gear teeth in case-hardening steel (Source: ASEA) More

Fig. 16 Pitting initiated along and immediately above the pitchline in helical gear teeth. In some areas, the progression has been continuous. Shown at actual size More

Fig. 10 Helical gear with serious ledge wear due to micro- and macropitting More

Fig. 1-2. Helical gear and pinion. More

Fig. 1-10. Secondary stresses set up in associated parameters of a helical gear due to the side thrust action of the helix. More

Fig. 1-16. Helical gear. All tooth characteristics were “perfect.” Field failure had been matched with pinion showing lead pattern of Fig. 1-15(d) . More

Fig. 3-4. Helical gear carburized and hardened to 60-63 HRC. A chattering tooth grinding wheel has “burned” small consecutive spots the full length of the profile on several teeth. Discovered by nital etching. More

Fig. 4-6. Helical gear, 1.12×. Tooth bending fatigue followed by tooth bending impact. Origin is off-center of the tooth midpoint but is directly above the center of the web. More

Fig. 4-13. Helical gear teeth, 2×. Pitting initiated along the pitchline and just above the pitchline. In some areas, the progression has been continuous. More

Fig. 5-1. Helical gear tooth, 1×. Pitting/spalling mode originating at a pit caused by subsurface fatigue around a small nonmetallic inclusion. Only one tooth affected. An isolated, random case. More