This paper demonstrates an application of the tooth interior fatigue fracture (TIFF) analysis method, as implemented in SMT's MASTA software, in which loaded tooth contact analysis (LTCA) results from a specialized 3-D contact model have been utilized to determine the load boundary conditions for analysis of tooth flank fracture (TFF).
The common calculation methods according to DIN 3990 and
ISO 6336 are based on a comparison of occurring stress and
allowable stress. The influence of gear size on the load-carrying
capacity is considered with the size factors YX (tooth root bending)
and ZX (pitting), but there are further influences, which
should be considered.
In the following, major influences of gear size on the load factors
as well as on the permissible tooth root bending and contact
stress will be discussed.
There's no substitute for a good
software package in gear manufacturing.
It's a critical shop floor tool
that provides practical engineering services
that customers appreciate. When
you're in the business of specifying and
procuring high quality gears, the software
needs to meet many objectives including
the consideration of all tolerances of
center distance, tooth thickness and tip
diameters, root diameters, fillets, etc. It's
also imperative that the software updates
include the latest revisions to the gear
standards being used in the industry.
My recent blog on educating kids on gears coincided with a birthday party invitation for a great nephew. Not having grandchildren of our own — I da...
Having read about an automobile race in France, Kohlsaat
decided he'd host America's first auto race in Chicago. The year
was 1895 and automobiles were still a great curiosity. Kohlsaat,
owner/publisher of the Chicago Times Herald, planned to exploit
the growing interest in motoring by sponsoring a 54-mile race
from downtown Chicago to nearby suburb Evanston, Illinois,
and back. The match was open to all comers, foreign or domestic,
whether powered by gas, electricity, or steam. The top prize:
$2,000 (that's 50,000 2016 dollars).
In terms of the tooth thickness, should we use the formulation with
respect to normal or transverse coordinate system? When normalizing
this thickness in order to normalize the backlash (backlash parameter),
we should divide by the circular pitch. Thus, when normalizing, should
this circular pitch be defined in the normal or traverse coordinate
system, depending on which formulation has been used? Is the backlash
parameter always defined with respect to the tangential plane or
normal plane for helical gears?