PolyChain® GT Timing Belts - Walther Flender

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 13
Rim flanges
Rim flanges for belt guidance
Poly Chain® timing belt pulley drive systems are designed with
a double flanged pulley for guiding the timing belt. To reduce
costs, the smaller timing belt pulley is frequently provided for this
purpose.
It should be noted, however, that the driven timing belt pulley
should always be equipped with double flanges, since this makes
it easier to guide the slack side. For very large centre distances
of axes (> 8 · d) and transmission ratios of 1 : 3 or higher and for
vertical shaft positions, both timing belt pulleys should have
double flanges.
We offer an extensive standard line of galvanized steel flanges;
please use the rim flange dimensions in the following tables for
your design.
The rim flanges are bevelled for better guidance of the timing
belt when it runs onto the pulley. Straight rim flanges sometimes
have the disadvantage that, if the shaft is not aligned precisely,
the belt tooth can run onto the inside edge of the flange, resulting
in premature wear. Therefore, we do not recommend using straight
rim flanges without a bevel.
Poly Chain® 8M
Number of teeth Code A (mm) B (mm) C (mm) s (mm)
22 18 L 48 54 60 1.5
23 14 H 47 57 63 1.5
24 15 H 51 60.5 66.5 1.5
25 16 H 53 64 71 1.5
26 – 27 17 H 57 68 75 1.5
28 – 29 18 H 60 72 79 1.5
30 19 H 64 76 83 1.5
31 – 32 20 H 68 79 87 1.5
33 21 H 73 84 91 1.5
34 – 35 22 H 76 88 93 1.5
36 23 H 79 91 97 1.5
37 – 38 24 H 82.5 96 103 1.5
39 – 40 25 H 87 100 106 1.5
41 – 42 26 H 91 105 111 1.5
43 27 H 97 109 115 1.5
44 – 45 28 H 99 114 119 1.5
46 – 48 30 H 107 121 127 1.5
49 – 51 32 H 116 129 135 1.5
52 – 53 33 H 120 134 140 1.5
54 – 55 34 H 126 139 146 1.5
56 – 57 36 H 132 145 152 1.5
58 – 61 38 H 140 154 160 1.5
62 – 64 40 H 148 161 168 1.5
65 – 67 42 H 156 170 176 1.5
68 – 70 44 H 164 177 184 1.5
71 – 73 46 H 172 186 192 1.5
74 – 77 48 H 180 195 200 1.5
78 – 83 L216 190 – 216 2
84 – 92 L238 200 – 238 2
93 L260 210 – 260 2.5
94 – 99 L260 S 230 – 260 2
100 – 107 L280 230 – 280 2.5
xmin = 6.0 mm
Ø C ± 0.5
D min = 0.5
Ø B ± 0.5
Ø A ± 0.15
D
8°min
25°max
S
x min.
Outer Ø
D min : Minimum material overlap for functional rolling of rim flange
Note: depending on the angle, the outer edge of the rim flange
may not be flush with the front face of the timing belt pulley!
Poly Chain® 14M
Number of teeth Code A (mm) B (mm) C (mm) s (mm)
28 L138 105 – 138 2.5
29 – 30 L142 90 – 142 2.5
31 – 32 L156 105 – 156 2.5
33 – 34 L172 115 – 172 2.5
35 – 38 L186 130 – 186 2.5
39 – 43 L200 144 – 200 2.5
44 – 46 L215 160 – 215 2.5
47 – 49 L230 190 – 230 2.5
50 – 52 L242 185 – 242 2.5
53 – 55 L260 210 – 260 2.5
56 – 59 L280 230 – 280 2.5
60 – 64 L300 250 – 300 2.5
65 – 68 L320 260 – 320 2.5
69 – 73 L340 280 – 340 2.5
74 – 79 L372 300 – 372 2.5
80 – 84 L385 330 – 385 2.5
85 – 92 L420 360 – 420 2.5
> 92 no standard flange, flange has to be adapted.
xmin = 6.0 mm