Metric Module Involute Splines Machinery's Handbook, 31st Edition
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Table 12. Comparison of Symbols Used in ANSI B92.2M-1980 (R1989) and Those in ANSI B92.1-1996 Symbol Meaning of Symbol Symbol Meaning of Symbol B92.2M B92.1 B92.2M B92.1 c … theoretical clearance m … module c v c v effective clearance … P diametral pitch c F c F form clearance … P s stub pitch = 2 P D D pitch diameter P b … base pitch DB D b base diameter p p circular pitch d ce D ce pin contact diameter, external spline π π 3.141592654 d ci D ci pin contact diameter, internal spline rfe r f fillet rad., ext. spline DEE D o major diam., ext. spline rfi r f fillet rad., int. spline DEI D ri major diam., int. spline E bsc s v min basic circular space width DFE D Fe form diam., ext. spline E max s max. actual circular space width DFI D Fi form diam., int. spline E min s min. actual circular space width DIE D re minor diam., ext. spline EV s v effective circular space width DII D i minor diam., int. spline S bsc t v max basic circular tooth thickness DRE d e pin diam., ext. spline S max t max. actual circular tooth thick. DRI d i pin diam., int. spline S min t min. actual circular tooth thick. h s … see Fig. 6a, Fig. 6b, Fig. 6c, and Fig. 6d SV t v effective circular tooth thick. λ λ effective variation α φ pressure angle INV α … involute α= tan α − arc α α D φ D standard pressure angle KE K e change factor, ext. spline α ci φ ci press. angle at pin contact diameter, internal spline
press. angle at pin contact diameter, external spline press. angle at pin center, internal spline press. angle at pin center, external spline press. angle at form diameter, external spline press. angle at form diameter, internal spline ext. spline cir. tooth thick. modification for required fit class = c v min (Table 14 ) tooth thick, size modifiers (called fundamental deviation in ISO R286), Table 14 space width size modifier (called fundamental deviation in ISO R286), Table 14
change factor, int. spline
KI
K i
φ ce
α ce
spline length
g
L
φ i
α i
…
active spline length
g w
φ e
α e
…
length of engagement
g γ
φ F
α Fe
machining tolerance
T
m
φ F
α Fi
meas. over 2 pins, ext. spline
…
es
MRE
M e
h, f, e, or d
meas. bet. 2 pins, int. spline
…
MRI
M i
H
…
number of teeth
Z
N
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