. Maryland institute handbook . .P.). The addendum is equal to ^ = Power Transmission 47 .3183 and likewise the bottom clearance = , () ()and the dedendum becomes * * + or 20 + = = and the whole depth of tooth = (.3183 + .3683) = .6866 The outside diameter of gear blank = Pitch diameter+() or Pitch diameter+.6366XCP. The thickness of tooth for rough gears = ., and the width of the space = .52 X The sum of which equals In first-class finished gears, the thickness of t
. Maryland institute handbook . .P.). The addendum is equal to ^ = Power Transmission 47 .3183 and likewise the bottom clearance = , () ()and the dedendum becomes * * + or 20 + = = and the whole depth of tooth = (.3183 + .3683) = .6866 The outside diameter of gear blank = Pitch diameter+() or Pitch diameter+.6366XCP. The thickness of tooth for rough gears = ., and the width of the space = .52 X The sum of which equals In first-class finished gears, the thickness of the tooth and space, each equal . or —~ The center to center distance between shafts =Sum of the pitch diameters TOOTH CURVES Two general systemsare used for finding theproper curves for theshaping of the teeth—theCycloidaland the In-volute are such Cycloidal system(see Fig. 18) is based onfinding a circle, calledgenerating circle, which c/cloidal is alternately rolled on the [inside and outside of the. 48 Power Transmission pitch circles with a trace point, which describes twocurves for each wheel, an Epicycloid Curve for the face,and a Hypocycloid Curve for the flank. The diameter of the generating circle is found by takingone-half the diameter of a 12-tooth pinion and of thepitch being used (see Fig. 18). A generating circle basedon the 12-tooth pinion generally is used, for with it theflanks of the teeth become radial. THE INVOLUTE SYSTEM In this system (see Fig. 19) a line drawn at an angle of75§° to the line of gear centers defines the angle ofapproach of the teeth of the two wheels. This line crosses the line of centersat the point of tangency^ .. of the two pitch circle inside and concen-tric with the pitch circledrawn tangent to the lineof contact is called thebase circle. An involutecurve starting from thepoint of intersection be-tween the base circle and INVOLUTE. i« e r i —— line of centers lorms the curve for the addendum,
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectmechanics, bookyear19
