Fig. 4-38. Spur gear tooth. Combination modes: Tooth bending impact (top); tooth shear (bottom). Arrows indicate direction of applied force. More

Fig. 1.31 Chart of gear tooth errors of a typical gear when run with a specified gear in a rolling fixture More

Fig. 6 Spiral bevel gear tooth failure. Tooth-bending fatigue with origin at the apex of the drilled bolt hole, which terminated just below the root radius. Original magnification at 0.5× More

Fig. 30 Spur-gear tooth showing combination failure modes. (a) Tooth-bending impact. (b) Tooth shear. Arrows indicate direction of applied force. More

Fig. 4-8. Spiral bevel gear tooth, 0.7×. Tooth bending fatigue with origin at the apex of the drilled bolt hole, which terminated just below the root radius. More

Fig. 4-49. Spiral bevel gear tooth. Internal rupture lifting the entire top of a tooth. More

Fig. 6.9 (a) View of dislocated tooth. (b) Gear tooth microhardness profile More

Fig. 1.29 An indication of cooling times for gear shapes. (a) Time for gear tooth fillet surface to cool from 800 to 400 °C during oil quenching. (b) Time for gear tooth center on the root circle diameter to cool from 800 to 400 °C during oil quenching. (c) Time for rim or body center to cool More

Fig. 1.29 An indication of cooling times for gear shapes. (a) Time for gear tooth fillet surface to cool from 800 to 400 °C during oil quenching. (b) Time for gear tooth center on the root circle diameter to cool from 800 to 400 °C during oil quenching. (c) Time for rim or body center to cool More

Fig. 1.29 An indication of cooling times for gear shapes. (a) Time for gear tooth fillet surface to cool from 800 to 400 °C during oil quenching. (b) Time for gear tooth center on the root circle diameter to cool from 800 to 400 °C during oil quenching. (c) Time for rim or body center to cool More

Fig. 16.9 Crack origin subsurface in a gear tooth section due to rolling-contact fatigue. Progression was parallel to surface and inward away from surface. Not etched. Original magnification: 60× More

Fig. 12.30 Mandrel to flow form an internal gear tooth form. Source: Ref 12.2 More

Fig. 24 Ion-carburized gear tooth, 2H2N4A steel, ion carburized at 920 °C (1690 °F), austenitized at 830 °C (1525 °F), oil quenched and tempered at 150 °C (300 °F). Source: Ref 12 More

Fig. 6 Chipping at the pressure point of a gear tooth. Courtesy of Pye Metallurgical Consulting, Inc. More

Fig. 1 Schematic of typical gear tooth nomenclature More

Fig. 6 Schematic of an involute gear tooth. Source: Ref 1 More

Fig. 20 Diagramatic stress areas on basic spur gear tooth. Source: Ref 2 More

Fig. 8 Plot of film thickness versus pinion roll angle for gear tooth geometry of a scuffed gearset. Minimum specific film thickness, λ min , 0.073; probability of wear, >95% More

Fig. 9 Plot of contact temperature versus pinion roll angle for gear tooth geometry of scuffed gearset. Maximum T c , 226 °C (439 °F); scuffing probability, 63% More

Fig. 10 Plot of film thickness versus pinion roll angle for gear tooth geometry that was optimized for maximum scuffing resistance. λ min , 0.097; probability of wear, 94% More