Английский язык. Теория механизмов и машин. Профессиональная составляющая языковой подготовки. Горбенко М.В - 41 стр.

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41
Table III.2
Tooth Sizes in General Uses
Quantity* Formula Quantity* Formula
Addendum
n
P
00.1
External
gears:
Table III.4
Standard
Tooth
Proportions
for Helical
Gears
Dedendum
n
P
25.1
Standard
center
distance
2
dD +
Diametral Pitch
Coarse 2, 2.25, 2.5, 3, 4, 6, 8, 10, 12, 16
Fine 20, 24, 32, 40, 48, 64, 80, 96, 120, 150,
200
Modules
Preferred 1,1.25, 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10,12.16,
20, 25, 32, 40, 50
Next
Choice
1.125, 1.375, 1.75, 2.25, 2.75, 3.5,4.5, 5.5,
7, 9, 11, 14, 18, 22, 28, 36, 45
Item Formula
Working
depth
Ph
k
/0.2
=
Clearance
in002.0)/188.0(
+
=
P
c
Addendum
of gear
2
90
)(
460.054.0
mP
P
a
G
+=
Gear ratio
PGG
NNm /
=
Equivalent
90° ratio
G
mm
=
90
when
o
90=Σ
Γ
γ
=
cos
cos
90 G
mm
when
o
90≠Σ
Face width
3
o
A
F =
or
P
F
10
=
, whichever is
smaller
Table III.3
Tooth Proportions for
20° Straight Bevel-
Gear Teeth
Minimum
number of
teeth
Pinion 16 15 14 13
Gear 16 17 20 30

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