Gear Design Seminar Content
1. Basic introduction to gear rating theory and
Standardized AGMA/ISO Analyses Methods including theoretical models for
strength, durability, wear, and scoring hazard.
2. Practical considerations and limitations associated
with the application of Standard AGMA/ISO durability rating
analyses.
a. The theoretical surface contact stress model and its application
to gear tooth contact conditions.
3. Investigation of the differences in stress states
among the various surface durability failure modes including pitting,
spalling, case crushing, and subcase fatigue.
4. Extended load capacity analysis techniques (beyond
the AGMA/ISO Standard methods) including:
a. Subsurface shear stress analysis for the determination
of optimum effective case depth & relation to subcase fatigue and
case crushing
b. Conversion of subsurface shear stress profile into required
subsurface hardness profile
5. Consideration of friction in the calculation of
Surface Compressive stresses
a. The relation between pure Hertz type compressive stress
and pitting
b. The relationship between spalling and the occurrence of a
combined tension and compression state at the tooth surface due to mesh
friction effects
6. Practical considerations and limitations associated
with the application of Standard AGMA/ISO strength rating analyses.
a. The theoretical strength stress model and its
application to gear tooth bending stress evaluation.
b. Correspondence between calculated stress numbers and actual
measured tooth root stresses
7. The effect of gear blank rim thickness on the tooth
root stress state.
a. Rim bending participation
b. The rim thickness factor – development and limitations
8. Discussion of differences between fatigue, time
dependent, and time independent failure modes as related to gear tooth
design.
a. Durability & Strength
b. Wear
c. Scoring
9. Wear evaluation by the application of
Elastohydrodynamic analyses
a. Basis of the analysis development
b. Probabilistic nature of wear evaluation
c. Time dependent, non-fatigue nature of wear progression
d. Self propagating mechanism
10. Scoring Hazard evaluation by the application of
Blok’s Critical Temperature Theory
a. Basis of the analysis development
b. Probabilistic nature of the problem
c. Time independent nature of failures
11. Optimization of gear tooth detail design parameters
including:
a. Considerations for minimum roll angles
b. Effect of and design for specific sliding (slip ratio) and
entraining velocity
c. Stress balanced or life balanced gear pinion and gear relative
design
d. Influence of geometric characteristics such as tooth top land,
tooth thickness, etc. on optimized tooth design
12. Considerations of fillet geometry in the avoidance
of fillet interference and excessive stress concentrations due to
adverse fillet geometry.
Computer generated animated graphics will be used for examining mesh
action and tooth interaction. Each section discussion will be followed
by a brief question and answer period. The registration fee will include
all meeting materials, scheduled meal functions and an opening evening
networking reception. A certificate will be awarded to each
attendee upon completion of the seminar.
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