Industrial Transmission Belts

Product description

ROFLEX-VARI 403 variable speed V-belts, also termed V/S-belts, are temperature and oil resistant as well as antistatic. A special rubber compound with textile fibres oriented across the length of the belt provides high stability and minimizes deflection in the cross section. The moulded cog ensures maximum flexibility and optimum fit in the pulley grooves.
The cord, the power transmitting element, has been designed for heavy power transmission while at the same time ensuring a very high degree of length stability.

Special belts are produced to order, e.g. with Kevlar cord or in a moulded double-cog version.

Application

ROFLEX-VARI 403 variable speed V-belts have been specially designed for infinitely variable gears for industrial machinery. The belt runs vibrationlessly and ensures effective control of speed ratios and long life.

Variable speed V-belts are used in open or closed gear types.

ROULUNDS is the leading European supplier of original equipment variable speed V-belts for variable gears.

Standards

ROFLEX-VARI industrial belts:
ISO 1604, DIN 7719/1, RMA/MPTA IP-25

Programme / Product Range

According to ISO 1604, DIN 7719/1, RMA/MPTA IP-25 or customer specifications; available within the following dimensional ranges:

Section Dimensions

Top Width :		13 - 100 mm
Height :		5 - 32 mm
Belt Angle :		20°- 42° with 2° interval
Outside Length :		500 - 5000 mm

Standard Section Dimensions

ROFLEX-VARI 403 is supplied according to the following standards:

ISO 1604, DIN 7719/1, section dimensions in mm:

Designation	Top width W	Pitch width Wp	Height T
W16	17	16	6
W20	21	20	7
W25	26	25	8
W31,5	33	31,5	10
W40	42	40	13
W50	52	50	16
W63	65	63	20
W71*)	74	70	23
W80	83	80	26
W100	R104	100	32

^*) In DIN 7719 only

ISO 1604 uses datum belt length Ld [mm] which corresponds to pitch length Lp [mm]
DIN 7719/1 uses Richtlänge Lr [mm], which corresponds to datum belt length Ld [mm]

Belt designation:

Datum length Top width Height

2000 mm 42 mm 13 mm

RMA/MPTA IP-25, section dimensions in inches:

Designation	Top width W	Height T
1422V	0.88	0.31
1922V	1.19	0.38
2322V	1.44	0.44
1926V	1.19	0.44
2926V	1.81	0.50
3226V	2.00	0.53
2530V	1.56	0.59
3230V	2.00	0.62
4430V	2.75	0.69
4036V	2.50	0.69
4436V	2.75	0.72
4836V	3.00	0.75

Belt designation:

Pitch belt length in 1/10 inch = 80 inches Designation of variable speed V-belt Pulley angle 30° Top width in 1/16 inch = 1,56 inches

RMA/MPTA IP-25, section dimensions in mm:

Designation	Top width W	Height T
22V / A22	22	8
30V / A22	30	10
37V / A22	37	11
30V / A26	30	11
46V / A26	46	13
51V / A26	51	13
40V / A30	40	15
51V / A30	51	16
70V / A30	70	18
64V / A36	64	18
70V / A36	70	18
76V / A36	76	19

Belt designation:

Pulley angle 30° Effective belt length 2060 mm Designation of variable speed V-belt Top width 40 mm

Calculation of belt length:

Outside belt length		Datum / pitch length + belt height x 1.57
Pitch/datum belt length		Outside length - belt height x 1.57
Inside belt length		Outside length - belt height x 6.283
Effective belt length		Outside belt length
Belt angle		Pulley angle + 2° as a guideline.