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Select the required belt type from the table below, based on the rotational speed (rpm) of the small pulley and the designed power.
(1) Select the number of teeth for the large and small pulleys that satisfy the gear ratio
already determined.
*Please refer to the following to select timing belts.
(However, for small pulleys, select teeth numbers greater than the allowable minimum number of teeth shown in Table 26.)
Rotational Speed of Small Pulley (rpm) | |||||||
---|---|---|---|---|---|---|---|
Belt Type and Minimum Number of Teeth | Up to 900 |
Over 900 Up to 1,200 |
Over 1,200 Up to 1,800 |
Over 1,800 Up to 3,600 |
Over 3,600 Up to 4,800 |
Over 4,800 Up to 10,000 |
|
MXL | 12 | 15 | 15 | 16 | - | - | |
XL | 11 | 11 | 12 | 16 | 16 | - | |
L | 14 | 14 | 16 | 19 | 20 | - | |
H | 16 | 18 | 20 | 24 | 24 | - | |
S2M | 16 | 16 | 18 | 20 | 20 | 20 | |
S3M | 16 | 16 | 18 | 20 | 20 | 20 | |
S5M | 16 | 20 | 24 | 24 | 24 | 26 | |
S8M | 24 | 25 | 28 | 30 | 32 | - | |
S14M | - | 40 | 48 | - | - | - | |
P2M | 14 | 14 | 14 | 16 | 18 | 20 | |
P3M | 14 | 14 | 14 | 18 | 20 | 28 | |
P5M | 18 | 20 | 24 | 28 | 30 | 40 | |
P8M | 22 | 24 | 26 | 28 | 28 | - | |
UP5M | 18 | 20 | 24 | 28 | 30 | 40 | |
UP8M | 22 | 24 | 26 | 28 | 30 | - | |
MTS8M | 24 | 24 | 26 | 28 | 28 | - | |
T5 | 12 | 14 | 16 | 18 | 18 | - | |
T10 | 16 | 18 | 20 | 22 | 22 | - | |
2GT | 12 | 14 | 16 | 18 | 20 | - | |
3GT | 14 | 14 | 16 | 20 | 20 | - | |
EV5GT | 18 | 20 | 24 | 28 | 30 | - | |
EV8YU | 26 | 28 | 32 | 36 | - | - |
(2) Determine the approximate belt circumference (Lp´) based on the tentative distance between shafts (C´), the diameter of the large pulley (Dp), and the diameter of the small pulley (dp). (Calculate pulley diameter with P.D. dimensions)
(3) Determine a belt circumference (Lp) closest to the approximate belt circumference (Lp´), and
calculate the exact distance between shafts using the following formula.
For belts, please refer to the product pages.
(1) Calculate the approximate belt width (Bw′: mm) using the formula below, and select a belt width that is closest to the approximate belt width.
Number of Meshing Teeth Zm | 6 or more | 5 | 4 | 3 | 2 |
---|---|---|---|---|---|
Km | 1.0 | 0.8 | 0.6 | 0.4 | 0.2 |
Km *1 | 1.0 | 0.7 | 0.5 | - | - |
Belt Type | MXL | XL | L | H | S2M | S3M | S5M | S8M | S14M | MTS8M | P2M | P3M | P5M | P8M | T5 | T10 | 2GT | 3GT | EV5GT | EV8YU |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Reference | 6.4 | 25.4 | 25.4 | 25.4 | 4 | 6 | 10 | 60 | 120 | 60 | 4 | 6 | 10 | 15 | 10 | 10 | 4 | 6 | 15 | 20 |
(2) Check if the designed power (Pd) satisfies the following formula.
(If not, re-select a belt width one size larger.)
*For belt types P□M and UP□M, substitute the value of *Km for the mesh correction factor.
■ For 2GT, 3GT, EV5GT and EV8YU
Table 29. Width Correction Factor (Kb)
Belt Type | Belt Width | Width Correction Factor | |
---|---|---|---|
Nominal | mm | Kb | |
MXL | 019 | 4.8 | 0.72 |
025 | 6.4 | 1.00 | |
037 | 9.5 | 1.57 | |
050 | 12.7 | 2.18 | |
XL | 025 | 6.4 | 0.15 |
031 | 7.9 | 0.21 | |
037 | 9.5 | 0.28 | |
050 | 12.7 | 0.42 | |
L | 050 | 12.7 | 0.42 |
075 | 19.1 | 0.71 | |
100 | 25.4 | 1.00 | |
150 | 38.1 | 1.56 | |
H | 075 | 19.1 | 0.71 |
100 | 25.4 | 1.00 | |
150 | 38.1 | 1.56 | |
200 | 50.8 | 2.14 | |
S2M | 040 | 4 | 1.00 |
060 | 6 | 1.59 | |
100 | 10 | 2.84 | |
S3M | 060 | 6 | 1.00 |
100 | 10 | 1.79 | |
150 | 15 | 2.84 | |
S5M | 100 | 10 | 1.00 |
150 | 15 | 1.59 | |
250 | 25 | 2.84 | |
S8M MTS8M |
150 | 15 | 0.21 |
250 | 25 | 0.37 | |
300 | 30 | 0.45 | |
400 | 40 | 0.63 | |
S14M | 400 | 40 | 0.29 |
600 | 60 | 0.45 |
Belt Type | Belt Width | Width Correction Factor | |
---|---|---|---|
Nominal | mm | Kb | |
P2M | 40 | 4 | 1.00 |
60 | 6 | 1.59 | |
P3M | 100 | 10 | 1.78 |
150 | 15 | 2.84 | |
UP5M P5M |
100 | 10 | 1.00 |
150 | 15 | 1.59 | |
UP8M P8M |
150 | 15 | 1.00 |
250 | 25 | 1.79 | |
T5 | 100 | 10 | 1.00 |
150 | 15 | 1.60 | |
200 | 20 | 2.30 | |
250 | 25 | 2.90 | |
T10 | 150 | 15 | 1.60 |
200 | 20 | 2.30 | |
250 | 25 | 2.90 | |
300 | 30 | 3.50 | |
400 | 40 | 4.60 | |
500 | 50 | 5.80 | |
2GT | 4 | 4 | 1.00 |
6 | 6 | 1.67 | |
9 | 9 | 2.67 | |
3GT | 6 | 6 | 1.00 |
9 | 9 | 1.66 | |
15 | 15 | 2.97 | |
EV5GT | 9 | 9 | 0.53 |
12 | 12 | 0.76 | |
15 | 15 | 1.00 | |
EV5GT | 15 | 15 | 0.71 |
20 | 20 | 1.00 | |
25 | 25 | 1.29 |
Length correction factor (KL) | 0.80 | 0.90 | 1.00 | 1.10 | 1.20 |
---|---|---|---|---|---|
2GT Belt Length (mm) | Up to 130 | 131~182 | 183~280 | 281~419 | 420 or more |
3GT Belt Length (mm) | Up to 190 | 191~260 | 261~400 | 401~599 | 600 or more |
EV5GT Belt Length (mm) | Up to 440 | 441~550 | 551~800 | 801~1100 | 1,101 or more |
EV8YU Belt Length (mm) | Up to 600 | 601~900 | 901~1250 | 1251~1799 | 1,800 or more |
Notes