Industrial Transmission Belts

ROFLEX-VARI Agricultural V-Belts

Product description

ROFLEX-VARI 401 variable speed V-belts are temperature and oil resistant. 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. A special rubber compound with textile fibres oriented across the length of the belt provides high stability and minimizes deflection in the transverse direction. The moulded cog ensures maximum flexibility and optimum fit in the pulley grooves.

ROFLEX-VARI 404 is a reinforced version of 401. For example, the cord has been replaced by Kevlar cord which ensures better power transmission and a higher ultimate tensile strength.


ROFLEX-VARI 486 has the same characteristics as type 404 with Kevlar cord but is in double cog construction.

ROFLEX-VARI 488 has the same characteristics as type 404 but is in double cog construction reinforced with special cord fabric.

Application

ROFLEX-VARI 401 has been specially designed for the various infinitely variable transmissions of the combine harvesters.
The belt has been designed to absorb shock loads and large lateral pressures. It serves as a coupling belt in the event of blockings, yet the adapted friction level means that the belt pulls better through and causes fewer blockings.

ROFLEX-VARI 404 is recommended for cylinder drives where the demand for power transmission is particularly pronounced.

ROFLEX-VARI 486 and 488 is recommended for cylinder drives where the demand for power transmission is particularly pronounced.The reinforced variable speed belt is designed for heavy load cylinder drives and is highle resistant towards blockades due to carefully controlled friction features.

Standards

ROFLEX-VARI variable speed V-belts:
ISO 3410, ASAE S 211.4

Programme / Product Range

According to ISO 3410 and ASAE S 211.4 or according to customer specifications; available within the following dimensional ranges:

Top Width :
16 - 100 mm
Height :
8 - 25 mm, Double cog 8 - 33 mm
Belt Angle :
20°- 42° with 2° interval
Outside Length :
600 - 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
HG*)
HH*)
HI
HJ
HK
HL
HM
HN
HO
Top width W
16.5
20.4
25.4
31.8
38.1
44.5
50.8
57.2
63.5
Height T
8
10
12.7
15.1
17.5
19.8
22.2
23.9
25.4
*) On request only

ISO 3410 uses datum belt length Ld [mm] which corresponds to pitch belt length Lp [mm]

Belt designation:


Datum length 2800 mm

ASAE S 211.4*), section dimensions in inches:

Designation
HI
HJ
HK
HL
HM
HN
HO
Top width W
1.00
1.25
1.50
1.75
2.00
2.25
2.50
Height T
0.50
0.59
0.69
0.78
0.88
0.94
1.00
Length reduction **)
0.94
1.16
1.41
1.63
1.88
2.14
2.36
*) ASAE specifies effective belt length Le in inches.


Belt designation:


Effective belt length 80 inches
Section 2.00 x 0.88 inch

**) Conversion into datum belt length Ld with the above-mentioned reducion
Example: HM 80. Effective belt length 80 inches, datum belt length Ld 80 - 1.88 78.12"


ASAE S 211.4, section dimensions in mm:

Designation
25 FV
32 FV
38 FV
44 FV
51 FV
57 FV
63 FV
Top width W
25
32
38
44
51
57
6
Height T
13
15
18
20
22
24
26
Length reduction **)
24
30
36
41
48
54
60
*) ASAE specifies effective belt length Le in mm


Belt designation:


Effective belt length 2030 mm
Section 51 x 22 mm

**) Conversion into datum belt length Ld with the above-mentioned reduction.
Example: 51FV 2030. Effective belt length 2030 mm, datum belt length Ld 2030 - 48 1982 mm.


Calculation of belt length:

Outside belt length Datum length + belt height x 2.094
Pitch/datum belt length Outside length - belt height x 2.094
Inside datum belt length Outside length - belt height x 6.283
Effective outside belt length Outside belt length
Belt angle Pulley angle + 2º as a guideline.