文件名称:
ANSI B92.1-1970(R1993) SAE花键标准.pdf
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详细说明：Form Circle is the circle which defines the deepest points of involute form control of the
tooth profile. This circle along with the tooth tip circle (or start of chamfer circle) determines the limits of tooth profile requiring control. It is located near the major circle on the
internal spline and near the minor circle on the external spline.
Form Clearance (cF) is the radial depth of involute profile beyond the depth of engagement with the mating part. It allows for looseness between mating splines and for eccentricities between the minor circle (internal), the major circle (external), and their respective
pitch 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 direction parallel to the reference axis, also including parallelism and alignment variations (see
Fig. 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 actual
tooth thickness.
Major Circle is the circle formed by the outermost surface of the spline. It is the outside
circle (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 circle 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 tooth
thickness of the mating external spline. It does not define the fit between mating members,
because of the effect of variations.
Out of Round
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