ANSI B92.1-1970(R1993) SAE花键标准(外文版)

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ANSI B92.1-1970(R1993) SAE花键标准(外文版)

Form Circle is the circle which defines the deepest points of involute form control of thetooth profile. This circle along with the tooth tip circle (or start of chamfer circle) deter-mines the limits of tooth profile requiring control. It is located near the major circle on theinternal spline and near the minor circle on the external spline.
Form Clearance ( cF) is the radial depth of involute profile beyond the depth of engage-ment with the mating part. It allows for looseness between mating splines and for eccen-tricities between the minor circle (internal)， the major circle (external)， and their respectivepitch circles.
Form Diameter (DFe， DFi) the diameter of the form circle.
Internal Spline is a spline formed on the inner surface of a cylinder.
Involute Spline is one having teeth with involute profiles.
Lead Variation is the variation of the direction of the spline tooth from its intended direc-tion parallel to the reference axis， also including parallelism and alignment variations (seeFig. 1a ). Note: Straight (nonhelical) splines have an infinite lead.
Length of Engagement ( Lq) is the axial length of contact between mating splines.
Machining Tolerance ( m ) is the permissible variation in actual space width or actualtooth thickness.
Major Circle is the circle formed by the outermost surface of the spline. It is the outsidecircle (tooth tip circle) of the external spline or the root circle of the internal spline.
Major Diameter ( Do， Dri) is the diameter of the major circle.
Minor Circle is the circle formed by the innermost surface of the spline. It is the root cir-cle of the external spline or the inside circle (tooth tip circle) of the internal spline.
Minor Diameter ( Dre， Di) is the diameter of the minor circle.
Nominal Clearance is the actual space width of an internal spline minus the actual tooththickness of the mating external spline. It does not define the fit between mating members，because of the effect of variations.
Out of Roundness is the variation of the spline from a true circular configuration.