Machinery's Handbook, 31st Edition
Involute Splines 2333 Diametral Pitch ( P ) is the number of spline teeth per inch of pitch diameter. The diame tral pitch determines the circular pitch and the basic space width or tooth thickness. In conjunction with the number of teeth, it also determines the pitch diameter. (See also Pitch.) Effective Clearance ( c v ) is the effective space width of the internal spline minus the effective tooth thickness of the mating external spline. Effective Space Width ( S v ) of an internal spline is equal to the circular tooth thickness on the pitch circle of an imaginary perfect external spline that would fit the internal spline without looseness or interference considering engagement of the entire axial length of the spline. The minimum effective space width of the internal spline is always basic, as shown in Table 3. Fit variations may be obtained by adjusting the tooth thickness of the external spline. Three Types of Involute Spline Variations
Center Lines of Teeth
Reference Axis
Fig. 1a. Lead Variation
Center Lines of Teeth
Reference Axis
Fig. 1b. Parallelism Variation
Effective Spline Axis
Reference Axis
Fig. 1c. Alignment Variation Effective Tooth Thickness ( t v ) of an external spline is equal to the circular space width on the pitch circle of an imaginary perfect internal spline that would fit the external spline without looseness or interference, considering engagement of the entire axial length of the spline. Effective Variation is the accumulated effect of the spline variations on the fit with the mating part. External Spline is a spline formed on the outer surface of a cylinder. Fillet is the concave portion of the tooth profile that joins the sides to the bottom of the space. Fillet Root Splines are those in which a single fillet in the general form of an arc joins the sides of adjacent teeth. Flat Root Splines are those in which fillets join the arcs of major or minor circles to the tooth sides.
Copyright 2020, Industrial Press, Inc.
ebooks.industrialpress.com
Made with FlippingBook - Share PDF online