backlash, a clearance between mating gear teeth, is built into speed reducers to let the gears mesh without binding and to provide space for a film of lubricating oil between the teeth. this
the pinion depth specification for your particular pinion bearing will be stamped on the face of the pinion gear. backlash is how far the ring gear sits from the pinion gear once installed in the differential. you’ll find the backlash specification for your ring gear in the documentation with your gear set.
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backlash is most commonly created by cutting the teeth deeper into the gears than the ideal depth. another way of introducing backlash is by increasing the center distances between the gears. backlash due to tooth thickness changes is typically measured along the pitch circle and is defined by: = − where:
in general, backlash in gears is play between mating teeth. for purposes of measurement and calculation, backlash is defined as the amount by which a tooth space exceeds the thickness of an engaging tooth. it does not include the effect of center-
6.4 gear train and backlash. the discussions so far involved a single pair of gears. now, we are going to discuss two stage gear trains and their backlash. in a two stage gear train, as figure 6.3 shows, jt1 and jt4 represent the backlashes of first stage gear train and second stage gear train respectively.