Search Results for gear-tooth

Fig. 17 Spiral bevel gear tooth. Tooth-bending fatigue with origin at the apex of the drilled bolt hole, which terminated just below the root radius. 0.5× More

Fig. 33 Spur-gear tooth showing combination failure modes. (a) Tooth-bending impact. (b) Tooth shear. Arrows indicate direction of applied force. More

Fig. 18 (a) Pitch and (b) radius deviations in the gear tooth crest and tooth root regions. Source: Ref 35 More

Fig. 19 Midheight of the gear tooth at the middle of the gear thickness. This is a frequently specified standard test position for case depth of gears. It is not possible to tell from this view whether the middle position of the gear thickness is the actual test surface. More

Fig. 18 Spur-gear tooth. An internal crack originating at an oxide-type inclusion below the surface at the pitchline. A pit is being formed. Nital etch. 90× More

Fig. 20 Helical-gear tooth. Pitting initiated along and immediately above the pitchline. In some areas, the progression has been continuous. Actual size More

Fig. 23 Gear-tooth section. Rolling-contact fatigue. Crack origin subsurface. Progression was parallel to surface and inward away from surface. Not etched. 60× More

Fig. 24 Gear-tooth section. Rolling-contact fatigue. Crack origin subsurface. Progression was parallel with surface, inward, and finally to the surface to form a large pit or spall. Not etched. 60× More

Fig. 25 Gear-tooth section. Rolling-contact fatigue distinguished by subsurface shear parallel to surface. Note the undisturbed black oxides at the surface, indicating no surface-material movement. Not etched. 125× More

Fig. 29 Subsurface cracking that subsequently resulted in spalling at a gear-tooth edge. Unetched section of a carburized AMS 6260 steel gear tooth. Cracking initiated in the transition zone between the carburized case and the core. 500× More

Fig. 35 Case crushing at midprofile of a spiral bevel gear tooth. Progression is from the subcase area into the core and outward to the surface. More

Fig. 41 An internal rupture in a gear tooth at the case/core transition zone. The rupture does not reach the surface. This condition can be discovered by ultrasonic testing. More

Fig. 42 Spiral bevel gear tooth. Internal rupture is lifting the entire top of a tooth. More

Fig. 7 Unetched metallographic cross section through gear tooth showing subsurface fatigue crack formed by rolling contact. 132×. Source: Ref 12 More

Fig. 4 Gear-tooth section. Rolling-contact fatigue. Crack origin subsurface. Progression was parallel to surface and inward away from surface. Not etched. 60× More

Fig. 5 Gear-tooth section. Rolling-contact fatigue. Crack origin subsurface. Progression was parallel with surface, inward, and finally to the surface to form a large pit or spall. Not etched. 60× More

Fig. 6 Gear-tooth section. Rolling-contact fatigue distinguished by subsurface shear parallel to surface. Note the undisturbed black oxides at the surface, indicating no surface-material movement. Not etched. 125× More

Fig. 25 Plot of hardness across the carburized layer of a gear tooth made by using a micro-indentation hardness tester with a Vickers indenter. The equivalent Rockwell C hardness is shown on the right. The effective depth of hardness is indicated by the broken line cutting the hardness plot More

Fig. 43 (a) A fatigue crack initiating close to the flank surface of the gear tooth. (b) Multiple cracks within the carburized surface layer of the tooth in another area More

Fig. 85 Dendritic microsegregation in a fractured gear tooth. 2×. Source: Ref 30 More