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AGMA 2003-B97 Document Information:
Title
Rating the Pitting Resistance and Bending Strength of Generated Straight Bevel, Zerol Bevel, and Spiral Bevel Gear Teeth
American Gear Manufacturers Association
Publication Date:
Jan 1, 1997
Scope:
Rating formulas
This standard provides a method by which different gear designs can be
compared.
The formulas in this standard are intended to establish a uniformly
acceptable method for
calculating the pitting resistance and bending strength capacity of
generated straight bevel, zerol
bevel and spiral bevel gear teeth; curved and skewed tooth. They apply
equally to tapered depth and
uniform depth teeth.
The knowledge and judgment required to evaluate the various rating
factors come from years of
accumulated experience in designing, manufacturing and operating gear
units. Empirical factors
given in this standard are general in nature. AGMA application
standards may use other empirical
factors that are more closely suited to the particular field of
application. This standard is
intended for use by the experienced gear designer, capable of
selecting reasonable values for the
factors. It is not intended for use by the engineering public at
large.
Exceptions
The rating formulas in this standard are not applicable to other types
of gear tooth deterioration
such as scuffing, wear, plastic yielding, scoring, case crushing and
welding and are not applicable
when vibratory conditions exceed the limits specified for the normal
operation of the gears (see
ANSI/AGMA 6000-B96, Specification for Measurement of Lateral vibration
on Gear Units).
The formulas of this standard are not applicable when any of the
following conditions exist:
- bevel gears with offset, such as hypoids;
- straight and zerol bevel gears with transverse contact ratios, mp
(εα) less than 1.0;
- bevel gears with modified contact ratios, mo (εo) less than 1.0;
- bevel gears which have a poor contact pattern;
- interference exists between tips of teeth and root fillets;
- teeth are pointed;
- backlash is zero;
- bevel teeth finished by forging, casting or sintering.
Design considerations to prevent fractures emanating from stress
risers on the tooth profile, tip
chipping and failures of the gear blank through the web or hub should
be analyzed by general
machine design methods.
Scuffing
Formulas for scuffing resistance on bevel gear teeth are not included
in this standard. At the
present time, there is insufficient agreement concerning the method
for designing bevel gears to
resist scuffing failure.
Wear
Very little attention and concern have been devoted to the study of
gear tooth wear. This subject
primarily concerns gear teeth with low surface hardness or gears with
improper lubrication. No
attempt has been made to cover gear tooth wear in this standard.
Plastic yielding
This standard does not extend to stress levels above those permissible
for 10³ cycles, since
stresses in this range may exceed the elastic limit of the gear tooth
in bending or in surface
compressive stress. Depending on the material and the load imposed, a
single load cycle exceeding
the stress level for 10³ life cycles (see clause 16) can result
in plastic yielding of the
gear tooth.
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