Industrial Transmission Belts

ROFLEX-JOINED V-Belts

Product description

ROFLEX-JOINED V-belts, also termed JV-belts, consist of several single belts which are joined into one unit with a band at the top. This design absorbs the natural individual vibrations generated in a belt set.
The belt is temperature and oil resistant as well as antistatic.
Special belts are available in an extra heat resistant type and with a special polyester or Kevlar cord.
Every section of a joined V-belt is able to transmit the same power ratings as the corresponding section of programmes 11 and 15.

ROFLEX-JOINED V-belts are available in three different types, all of which are temperature and oil resistant as well as antistatic.
Quality 383: Reinforced belt design with lowered neutral axis, specially strong polyester cord and wear resistant fabric cover.
Quality 384: High heat resistant, reinforced belt design with lowered neutral axis. The belt is made with chloroprene rubber, specially strong polyester cord and wear resistant fabric cover.
Quality 387: Specially heat resistant, with lowered neutral axis. The belt is made with chloroprene rubber, Kevlar cord and wear resistant fabric cover.

Application

ROFLEX-JOINED V-belts are used for industrial machinery with pulsating/shock loads, e.g. crushers, compressors, etc., as well as for drives in which the natural vibrations of a belt set may have an adverse effect on the operation of the machine, e.g. lathes, cutters and grinders.
On agricultural machinery, and particularly combine harvesters, they are often used as coupling belts, replacing flat belts or instead of belt sets in order to reduce vibration and increase belt life.

Standards

ROFLEX-JOINED V-belts:
ASAE S 211.4, ANSI/RMA IP-20 and RMA/MPTA IP-22

Pulleys:
Joined V-belts require pulleys which comply with the following standards.

Classical sections:
ISO 5291, ASAE S 211.4, ANSI/RMA IP-20.

RMA sections:
ISO 5290, ASAE S 211.4, RMA/MPTA IP-22.
As regards the American standards, please refer to the dimensions stated in inches.

Section Programme


Section
Section
width
[mm]
Belt
Height
[mm]
Length
range
[mm]
HA / A
13
10
1300 - 3550
HB / B
17
13
1300 - 7110
HC / C
22
17
1450 - 12500
3V1) / 9J
9
10
4352) - 11802)
5V1) / 15J
15
16
7502) - 39752)
8V1) / 25J
25
26
12502) - 52002)

Section Dimensions

ASAE S 211.4
ANSI/RMA IP-20
RMA/MPTA IP-22

Z/10
A/13
B/17
C/22
D/32
E/40
Top width
W [mm]
13
17
22
9
15
25
Section height
T [mm]
8
11
14
8

13
23
Total height
H [mm]
10
13
17
10
16
26
Section spacing
e [mm]
15.88
19.05
25.4
10.3
17.5
28.6
Effective belt length
Le Li + [mm]
32
51
68
38
71
125
Outside belt length
La Li + [mm]
64
80
100
66
100
157
Min. pulley effective-diameter
de [mm]  
80
130
210
67
180
315
Weight per section
[kg/m]
0.154
0.237
0.406
0.095
0.250
0.637
Maximum deflection frequency
f [Hz] 
60
Recommended maximum belt speed
v [m/s]
30