Abstract: Using electric contact method
via embedded wire in a small hole drilled on gear tooth surface,
the turning angles of the gear at open and close circuit can be
obtained respectively and the width of instantaneous contact
locus then be converted. The measured widths of contact locus of
gears with different helical angles and under different loads
may be formularized, and the equation of contact stress is then
derived. The teeth surface contact fatique test of 16 gears made
of tempered 45 steel and 14 gears made of tempered 40Cr steel
are performed on a test stand with lock-in torque whose center
distance being of 120mm; their limited contact fatigue stresses
obtained in the test can be used, combining with the stress
equation in calculation on contact fatigue strength of model
JB2940-81 W-N gears.
Key words:
W-N
gears Contact locus Contact stress Fatigue test Limited stress
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