Page 160 - The Tribology Handbook

B1 Belt drives

Curvilinear tooth belts

The pitches below are de facto but not formal standards
1000
P mm 3 5 8 14 20
H mm* 2.4 3.8 6 10 13.2

dmin mm 9.5 22 56 125 216
1 oa
Di mm > smallest loaded pulley diameter
Lmin mm** 129 245 320 966
L,,, mm** 1863 2525 4400 6860

Wmax mm < smallest pulley diameter 5 io
* Varies slightly with manufacturer.
** Stock lengths, varies with manufacturer, other lengths to
special order.

1

0.1
100 1000 10,000
Fastest pulley rev/rnin
Figure 1.8 Power rating of curvilinear tooth belts

Trapezoidal tooth belts
I 1 I
Section XL L H XH XXH

P mm 5.08 9.52 12.7 22.22 31.75
Hmm 2.3 3.6 4.3 11.2 15.7

dmin mm 16 36 65 156 222
Di, mm > smallest loaded pulley diameter

L,;, mm** 152 314 609 1289 1778
L,,,mm** 685 1524 4318 44445 4572

wmox mm < smallest pulley diameter
** As above.
The dvalues in the Figures 1.8 and 1.9 are nominal. Actual values
give an integral number of teeth per pulley.

100 1000 10.000
Fastest pulley revhin

Figure 1.9 Power rating of trapezoidal tooth belts
61.6