spur gear Flashcards
The gears are termed as medium velocity gears, if their peripheral velocity is
3-15 m/s
The size of gear is usually specified by
pitch circle diameter
A spur gear with pitch circle diameter D has number of teeth T. The module m is defined as
m=d/T
In a rack and pinion arrangement, the rack has teeth of ………… shape.
trapezoidal
The radial distance from the ………… to the clearance circle is called working depth.
addendum circle
The product of the diametral pitch and circular pitch is equal to
π
The backlash for spur gears depends upon
module and pitch line velocity
The contact ratio for gears is
greater than one
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle
increases
The form factor of a spur gear tooth depends upon
number of teeth and the system of teeth
Lewis equation in spur gears is used to find the
compressive stress in bending
The minimum number of teeth on the pinion in order to avoid interference for 20° stub system is
14
The allowable static stress for steel gears is approximately ……… of the ultimate tensile stress.
one-third
Lewis equation in spur gears is applied
to weaker of the pinion or gear
The static tooth load should be ______ the dynamic load.
greater than
