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How to Select a Transmission Timing Belt 3

[Step 3] Temporarily Select the Belt Type Using the Selection Guide Table
[Step 4] Determine the Number of Teeth for Large and Small Pulleys, Belt Length, and Distance Between Shafts
[Step 5] Determine the Belt Width

[Step 3] Temporarily Select the Belt Type Using the Selection Guide Table

Select the required belt type from the table below, based on the rotational speed (rpm) of the small pulley and the designed power.

Temporarily Select the Belt Type Using the Selection Guide Table_1

Temporarily Select the Belt Type Using the Selection Guide Table_2

Temporarily Select the Belt Type Using the Selection Guide Table_3

Temporarily Select the Belt Type Using the Selection Guide Table_4

Temporarily Select the Belt Type Using the Selection Guide Table_5

Temporarily Select the Belt Type Using the Selection Guide Table_6

Temporarily Select the Belt Type Using the Selection Guide Table_7

[Step 4] Determine the Number of Teeth for Large and Small Pulleys, Belt Length, and Distance Between Shafts

(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.)

**Table 26. Allowable Minimum Number of Teeth**
		Rotational Speed of Small Pulley (rpm)
Belt Type and Minimum Number of Teeth		Rotational Speed of Small Pulley (rpm)						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)

Determine the Number of Teeth for Large and Small Pulleys, Belt Length, and Distance Between Shafts_1

C´: : Tentative distance between shafts

Dp: : Pitch diameter of large pulley (mm)

dp: : Pitch diameter of small pulley (mm)

Lp´: : Approximate belt circumference (mm)

(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.

Determine the Number of Teeth for Large and Small Pulleys, Belt Length, and Distance Between Shafts_2

Dp: : Pitch diameter of large pulley (mm)

dp: : Pitch diameter of small pulley (mm)

Lp: : Belt Circumference (mm)

C: : Distance between shafts

[Step 5] Determine the Belt Width

(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.

Pd: : Designed power

Ps: : Reference transmission capacity…Use the Reference Transmission Capacity Table.

Km: : Mesh correction factor (Table 27)

Wp: : Reference belt width (Table 28)

**Table 27. Mesh Correction Factor (Km)**
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	－	－

Zd: : Number of small-pulley teeth

Dp: : Pitch diameter of large pulley (mm)

C: : Distance between shafts (mm)

θ: : Contact angle (°)

dp: : Pitch diameter of small pulley (mm)

**Table 28. Reference Belt Width (Wp)**
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.

Pd＜Ps ・Km ・Kb

■ For 2GT, 3GT, EV5GT and EV8YU

Pd＜Ps ・Km ・Kb ・KL

Pd: : Designed power

Km: : Mesh correction factor

KL: : Length correction factor (Table 30)

Ps: : Reference transmission capacity

Kb: : Width correction factor (Table 29)

Table 29. Width Correction Factor (Kb)

Belt Type	Belt Width		Width Correction Factor
Belt Type	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
S14M	600	60	0.45

Belt Type	Belt Width		Width Correction Factor
Belt Type	Nominal	mm	Kb
P2M	40	4	1.00
P2M	60	6	1.59
P3M	100	10	1.78
P3M	150	15	2.84
UP5M P5M	100	10	1.00
UP5M P5M	150	15	1.59
UP8M P8M	150	15	1.00
UP8M P8M	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

**Table 30. Length Correction Factor (KL)**
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