ROSTA Tensioner Devices

ROSTA Tensioner Devices
Maintenance-free tensioner systems for belt and chain drives
Easy to install – available in 7 standard sizes – wide range of
accessories available
ROSTA
Customer Benefits from using ROSTA
SE
• Guarantees the lowest possible maintenance outlay
• Is tensioned “for life” (belts)
• Transmits a constant torque
• Gentle belt handling – longer service life
• Prevents the polygon effect in the slack side
• Increases the chain contact arc
• Excludes any jumping of the chain links
• Causes the slack side to run tautly and almost silently
SE-F
• Offers continuous contact pressure
• Compensates for wear on the scrapers
• Effectively dampens vibrations in the belt band
• Guarantee for clean conveyor belts
SE-W
4.2
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Tensioner Devices in Belt and Chain Drives
SE-B
• Offers an extremely quiet chain run
• Reduces wear on rollers and bearings
• Effectively dissipates vibrations
• 3-fold slack compensation with “Boomerang® ”
• Compensates for belt lengthening
• Prevents excessive slippage and over-heating
• Offers constant torque transfer
• Guarantees longer belt lifetimes
SE-I
• Offers an exactly defined contact pressure
• Accurately transports workpieces
• Maintenance-free and long lasting
• Is a cost-effective alternative to pressure cylinders
SE-G
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4.3
Selection table
Standard
component
Steel parts ROSTA blue painted.
Rubber quality Rubmix 10.
SE-G
Oil resistant
Steel parts galvanized.
Rubber quality Rubmix 20.
Marked with yellow dot.
SE-W
Heat resistant
Steel parts ROSTA blue painted.
Rubber quality Rubmix 40.
Marked with red dot.
Tension force 40% less than SE.
SE-R
Reinforced
lever arm
Arm and inner core especially welded for use
on combustion engines and compressors.
Steel parts ROSTA blue painted.
Marked with white ring.
SE-I
Stainless steel
For the use in food- and pharmaceutic industries.
Material: GX5CrNi19-10.
Exception: SE-I 40 made out of X5CrNi18-10.
SE-F
Front
mountingdevice
For installations on blind-hole frames
(fixation from the front only).
Steel parts ROSTA blue painted.
Hex socket screw quality 12.9.
SE-B
Boomerang ®
For the tensioning of very long chain and belt drives
(triple compensation).
Steel parts ROSTA blue painted.
Accessories chain drives
Accessories belt drives
Sprocket wheel N
Chain rider set P
Chain rider P
Tensioning roller R
Housing and inner core made out of steel.
SE
Sprocket wheel set N
Tensioner Devices
Characteristics
Housing and inner core made out of steel, inserts Rubmix 10.
Additional tensioner devices
Standard tensioner devices
Identification
Working temperature
Details
– 40 ° to + 176 ° F
Page 4.6 – 22 ° to + 194 ° F
Page 4.6
+ 176 ° to + 248 ° F
max.
Page 4.6
Page 4.6
Page 4.6
– 40 ° to + 176° F
Page 4.7
Page 4.7
Allows accurate positioning of relevant chain track.
Ball-bearings 2Z/C3, permanently lubricated.
– 40 ° to + 212° F
Page 4.8 For double sided use.
Max. allowed chain speed 59 in/sec.
Material: POM-H.
– 40 ° to + 212 ° F
Page 4.9
Material: PA 6.
Ball-bearings 2Z/C3, permanently lubricated.
– 31 ° to + 212 ° F
Page 4.10
Further information to customized elements and installation examples as from page 4.12.
4.4
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Illustration
General technology
F
F
pretension
infinitely variable
in the positions
“normal” or “hard”
The ROSTA tensioners should be installed on a stiff, even
and clean machine part by means of the central bolt. The
frictional connection on flange is usually fully suffi­cient for
final positioning. The positioning notch on flange can be
used to assure the tensioner additionally on uneven and
dirty surfaces by setting a roller-pin.
adjustable
chain track
shock absorption
Tensioning force F
The tensioning force can be continuously adjusted. The max.
pre-tensioning angle is + 30° out of neutral position. Tensioning
force table for types SE / SE-G / SE-R / SE-F / SE-I by using holeposition “normal” for sprocket-, rider- and roller fixation.
Size SE
Pre-tension  10°
F [lb]
s [in]
Pre-tension  20°
F [lb]
s [in]
torsion angle scale
360 ° position
flexibility
MA
positioning notch
one bolt central
mounting on
front or base
Pre-tension  30°
F [lb]
s [in]
11
3.4
0.55
9.0
1.10
18.0
1.57
15
5.6
0.67
14.6
1.34
30.3
1.97
18
16.9
0.67
40.5
1.34
78.7
1.97
27
33.7
0.87
85.4
1.73
179.8
2.56
3.43
38
65.2
1.18
164.1
2.36
337.2
45
112.4
1.54
292.3
3.07
584.5
4.41
50
168.6
1.69
483.3
3.39
944.2
4.92
Tightening torque MA
for attachment screw
Table mentioning the tightening moment for the
central screw (included in scope of delivery).
SE-I 40:same tensioning force like SE 38.
SE-W: 40 % lower tensioning force than standard versions
(Rubmix 40 inserts).
When fixing the sprockets, riders and rollers in
arm-position “hard”, tensioning force will increase
on about 25 %.
Quality 8.8
Quality 12.9
only with SE-F
M6
7.4 lb ft
12.5 lb ft
30.2 lb ft
M8
18.4 lb ft
M10
36.1 lb ft
61.2 lb ft
M12
63.4 lb ft
106.9 lb ft
M16
154.9 lb ft
261.8 lb ft
M20
302.4 lb ft
508.9 lb ft
M24
553.2 lb ft
Mounting instructions
Z-configuration of sprockets or riders
Use of SE-B Boomerang ® tensioners
Tensioner mounting
If there is the need to install sprockets, riders or rollers on the outer arm-side of the
tensioner, then the distance “Z” should be
as little as possible to avoid a misalignment in element parallelism. Furthermore
the pre-tension force should not exceed
50 % of the capacity = max. pre-tension
angle of ~ 20 °.
Z
In very long chain and belt drives it was Tighten the flange screw slightly. Grip
recommendable to install on the slack-side the housing with flat-wrench and set
several tension­ers, in order to compensate needful pre-tension by rotating the
occurring elongation. The “Boomerang” housing in the required direction. Tightwith its bent double-arm equipped with en the central screw according the
two chain sprockets or a combina­tion of above mentioned tighten­
ing moment
grooved pulley and flat-roller (belt-drives) M A.
offers a triple-compensation of
chain and belt elongations, due to
S-shape contact-arc.
position flat-wrench
Tensioner Devices
For further mounting instructions please consult the pages 4.9 / 4.11.
close by the flangebottom
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4.5
Tensioner Devices
Type SE/SE-G/SE-W
Type SE-R
Type SE-I
T
normal
F
L
J1
U
H
Art. No.
SE 11
SE 11
SE 11-G
06011061**
D
E
K
J2
M
O
Standard Tensioner Devices Types SE / SE-G / SE-W
Type
T
hard
øD
MA
s normal
G
P
N
E
G
H
J1
J2
K
L
M
N
O
P
T
U
Weight
[lb]
61030002*
1.38
2.01 – 0.020
+0.039
0.20
M6
3.15
2.36
0.79
3.54
0.79
0.87
0.24
0.31 0.39*** 0.65
0.4
1.77
2.52
+0.039
– 0.020
0.20
M8
3.94
3.15
0.98
4.43
0.98
1.18
0.31
0.33 0.53*** 0.82
0.9
3.11 – 0.020
+0.059
0.28
M10
3.94
3.15
1.18
4.53
1.18
1.38
0.41
0.33 0.53*** 1.00
1.3
+0.079
– 0.020
0.31
M12
5.12
3.94
1.97
6.10
1.57
2.05
0.59
0.41 0.53*** 1.35
3.7
61030009
SE 15
SE 15
06011062**
61030003*
SE 15-G
61030010
SE 15-W
61030016
SE 18
SE 18
06011063**
SE 18-G
61030011
SE 18-W
61030017
SE 27
SE 27
06011064**
SE 27-G
61030012
SE 27-W
61030018
61030004*
2.28
61030005*
SE 38
61030006*
SE 38-G
61030013
SE 38-W
61030019
SE 45
61030007*
SE 45-G
61030014
SE 45-W
61030020
SE 50
61030008*
SE 50-G
61030015
SE 50-W
61030021
3.07
4.25
3.74
5.51 – 0.020
+0.079
0.39
M16
6.89
5.51
2.36
8.07
1.57
2.60
0.59
0.49
0.81
1.65
7.9
4.53
7.87 – 0.039
+0.118
0.47
M20
8.86
7.09
2.76
10.24
1.97
3.15
0.71
0.49
0.81
2.05
14.1
5.12
8.27
+0.118
– 0.039
0.79
M24
9.84
7.87
3.15
11.42
2.36
3.43
0.79
0.67
0.81
2.26
19.8
Tensioner Devices
* Tensioning elements with idler hardware.
** Tensioning elements without idler hardware/other sizes available upon request.
*** Also holes for metric bolts available (special order).
SE-R
Tensioning element with strengthened tensioning arm
Type
Art. No.
SE-R 15
61030022
SE-R 18
SE-I
61030023
D
1.77
2.28
E
G
H
J1
J2
K
L
M
N
O
P
T
U
Weight
[lb]
2.52
+0.039
– 0.020
0.20
M8
3.94
3.15
0.98
4.43
0.98
1.18
0.31
0.33
0.41
0.82
0.9
3.11
+0.059
– 0.020
0.28
M10
3.94
3.15
1.18
4.53
1.18
1.38
0.41
0.33
0.41
1.00
1.3
J2
K
L
M
N
O
P
T
U
Weight
[lb]
Tensioning element made out of stainless steel, INOX
Type
Art. No.
D
E
G
H
J1
SE-I 15
61030024
1.77
2.52
+0.039
– 0.020
0.20
M8
3.94
3.15
0.98
4.43
0.98
1.18
0.31
0.33
0.41
0.82
0.9
SE-I 18
61030025
2.28
3.11
+0.059
– 0.020
0.28
M10
3.94
3.15
1.18
4.53
1.18
1.38
0.41
0.33
0.41
1.00
1.5
0.31
M12
5.12
3.94
1.97
6.10
1.57
2.05
0.59
0.41
0.49
1.35
4.6
0.39
M16
6.89
5.51
2.76
8.07
1.57
2.76
0.59
0.47
0.81
1.63
8.4
SE-I 27
61030026
3.07
4.25
+0.079
– 0.020
SE-I 40
61030027
3.94
5.51
+0.079
– 0.020
Further product and performance data on pages 4.4–4.5.
4.6
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F
Tensioner Devices
s normal
F
T
normal
F
F
F
J1
L
Type SE-F
T
hard
U
H
R
øD
K
J2
M
MA
O
screwquality 12.9
G
E
P
N
Tensioning element with front mounting
G
H
J 1
J 2
K
L
M
ca.
N
O
P
+0.039
– 0.020
0.20
M6
3.94
3.15
0.98
4.43
0.47
1.18
0.31
0.33
0.39 0.53*** 0.82
0.9
3.11
+0.059
– 0.020
0.28
M8
3.94
3.15
1.18
4.53
0.71
1.38
0.41
0.33
0.43 0.53*** 1.00
1.5
4.25
+0.079
– 0.020
0.31
M10
5.12
3.94
1.97
6.10
0.67
2.05
0.59
0.41
0.59 0.53*** 1.35
4.2
0.39
M12
6.89
5.51
2.36
8.07
0.63
2.60
0.59
0.49
0.67
0.81
1.65
8.2
Type
Art. No.
D
E
SE-F 15
61030028
1.77
2.52
SE-F 18
61030029
2.28
SE-F 27
61030030
3.07
R
T
Weight
[lb]
U
SE-F 38
61030031
3.74
5.51
+0.079
– 0.020
SE-F 45
61030032
4.53
7.87
+0.118
– 0.039
0.47
M16
8.86
7.09
2.76
10.24
1.26
3.15
0.71
0.49
0.94
0.81
2.05
15.2
SE-F 50
61030033
5.12
8.27
+0.118
– 0.039
0.79
M20
9.84
7.87
3.15
11.42
0.91
3.43
0.79
0.67
1.06
0.81
2.26
22.3
*** Also holes for metric bolts available (special order)
K
Type SE-B
Boomerang ®
s normal
T
M
U
12
0°
F
J2
J1
L
T
2
J
1
K
J
G
L
E
Type
Art. No.
D
SE-B 18
06021003
2.28
3.07
SE-B 27
06021004
3.07
4.25
G
H
J1
J2
K
L
M
N
O
P
T
U
Weight
[lb]
+0.059
– 0.020
0.24
M10
3.94
3.15
1.18
4.53
1.18
1.38
0.41
0.33
0.41
1.00
1.8
+0.079
– 0.020
0.31
M12
5.12
3.94
1.97
6.10
1.57
2.05
0.59
0.41
0.49
1.35
4.6
E
Tensioner Devices
T
O
T
N
P
H
øD
MA
Further product and performance data on pages 4.4–4.5.
www.rosta.com
4.7
Accessories
Sprocket wheel set type N
Sprocket wheel type N
Simplex “S”
Duplex “D”
W
L
R
Sprocket wheel type N
Number
of teeth
Bore
A
Length thru Bore
B
Element type
61030000
61030034
61030035
61030036
61030037
61030038
61030039
61030040
61030041
20
19
18
18
17
15
12
11
9
3/8
1/2
1/2
1/2
1/2
1/2
3/4
3/4
3/4
5/16
3/8
7/16
7/16
7/16
7/16
39/64
39/64
19/32
SE 11
SE 15
SE 18
SE 18
SE 27
SE 27
SE 38
SE 45/50
SE 45/50
61030043
61030044
61030045
61030046
61030047
19
18
17
15
12
1/2
1/2
1/2
5/8
3/4
7/16
7/8
1
1 21/64
1 45/64
SE 15
SE 18
SE 27
SE 27
SE 38
Type
Art. No.
N 1/4" N 3/8" N 1/2" N 1/2" N 5/8" N 3/4" N 1" N 1 1/4" N 1 1/2“ N 3/8" N 1/2" N 5/8" N 3/4" N 1" ∅ A
Chain
ANSI
Simplex “S”
25BB
35BB
40BB
41BB
50BB
60BB
80BB
100BB
120BB
B
B
Tensioner Devices
35-2
40-2
50-2
60-2
80-2
4.8
www.rosta.com
∅ A
Duplex “D”
Simplex “S”
Z
Z
Z
Z
W
W
W
For an ideal positioning of the chain rider/s
on the threaded rod we do recommend to
position them on each side by means of two
nuts, secured against each other, with some
play for swivelling into working position.
Z
0°
.9
ax
R
Y
X
Z
L
L
of r
ide
rm
Chain rider type P
Duplex “D”
L
W
L
Glide angle
Chain Drives
R
R
R
Chain rider set type P
Roller chain
ANSI
Type
Art. No.
W
L
X
Y
Z
Torque
hex nut 0.5 d
[lb ft]
Adjusting
range track
R
Element
Type
P3/8" – 8 S
P1/2" –10 S
P5/8" –10 S
P3/4" –12 S
06550001
06550002
06550003
06550004
M8
M10
M10
M12
1.77
2.17
2.17
3.15
2.91
3.78
4.96
5.83
1.46
1.89
2.48
2.83
0.40
0.55
0.65
0.77
8.1
14.8
14.8
25.8
0.75 - 1.34
0.91 - 1.61
0.94 - 1.54
1.18 - 2.40
SE 11
SE 15/18
SE 18
SE 27
P3/8" – 8 D
P1/2" –10 D
P5/8" –10 D
P3/4" –12 D
06560001
06560002
06560003
06560004
M8
M10
M10
M12
1.77
2.17
2.76
3.15
2.91
3.78
4.96
5.83
1.46
1.89
2.48
2.83
0.40
0.55
0.65
0.77
8.1
14.8
14.8
25.8
0.98 - 1.18
1.18 - 1.34
1.34 - 1.81
1.57 - 2.05
SE 11
SE 15 /18
SE 18
SE 27
Simplex “S”
35
40
50
60
Duplex “D”
35
40
50
60
Mounting instructions for Chain Drives
See also complementary mounting instructions on page 4.5.
The ROSTA tensioning device should be placed on the
slack-side of the chain drive,
close by the smaller sprocket
wheel in order to enlarge its
contact-arc, therefore contact
application from outer side of
drive. In mounted position the tensioner-arm should stay
close to parallel to the chain run, in drain direction. By
ex­tremely long chain drives it is recommendable to install several tensioners or the type “Boomerang®” in order to enlarge the slack compensation.
Reversible chain drive
By reversible chain transmis­sions it is recommendable to install
a tensioner on each side of
the chain-strands. Due to the
alternate occurring of the
slack, both tensioners should
only be pre-tensioned up to
max. 20°, in order to retain a
reset-path of 10°, when strains are changing from slack span
on working span in reversible applications.
Sprocket teeth in mesh
By the initial tensioning of the chain at
least three teeth of the tensioner sprocket wheel should be in mesh with the
rollers. The min. distance between
sprocket wheel of the tensioner to the
next sprocket wheel in the chain drive
should be at least four chain-pitches.
C
Adjustment of chain-track
The wheel of the sprocket wheel set is adjustable according to the position of the
chain drive track. The wheel is positioned
between two nuts on the threaded shaft.
In changing the adjustment band “R”, the
track of the tensioner wheel can be set according to relevant strand course. After
positioning of sprocket, re-tighten the two
nuts on the side. The counter-nut “B” remains always tightened.
www.rosta.com
B
Tensioner Devices
Standard positioning
R
4.9
Accessories belt drives
CD
B
E
Type
R 11
R 15/18
R 27
R 38
R 45
Art. No.
06580001
06580002
06580003
06580004
06580005
Max.
belt width
A
B
C
D
E
max.
F
Torque
hex nut
[lb ft]
Size SE
Weight
[lb]
8000
8000
6000
5000
4500
1.18
1.57
2.17
3.35
5.12
1.18
1.57
2.36
3.15
3.54
1.38
1.77
2.36
3.54
5.31
0.08
0.24
0.31
0.31
0.39
0.55
0.63
0.67
0.98
1.06
0.20
0.28
0.31
0.39
0.47
M8
M10
M12
M20
M20
14.8
14.8
25.8
118.0
118.0
11
15/18
27
38
45
0.18
0.37
0.88
2.54
3.86
Type
Art. No.
Overall
Width
Flat Surface
Width
Pulley OD
Bore
CB4
06585001
1 7/16
1
4 3/4
1/2
Length Thru
Bore
23/32
Tensioner Devices
V Belt Pulley Idler
Type
Art. No.
Belt Size
Pitch
Diam.
Pulley OD
Bore
Length Thru
Bore
A3
B5
B7
06586002
06586001
61030042
A
B-C
B-C
2 1/2
3 3/4
6
3
5 1/16
7 5/16
3/8
1/2
1/2
27/32
23/32
23/32
www.rosta.com
F
Max. speed
[ rpm ]
Flat Belt or Quiet Chain Idler
4.10
øA
Tensioning roller
Type R
Instructions for belt drives
a) Selection of the adequate ROSTA Tensioner size
Selection table mentioning the most conventional V-belt types.
Size SE* (without SE-W and SE-B)
V-belt type
Width
[in]
Height
[in]
Diam. of smaller
pulley [in]
Initial operation
test-force FI** [lb]
Operational testforce FO** [lb]
1 belt
2 belts
3 belts
4 belts
5 belts
XPZ, SPZ
0.39
0.31
2.20 - 2.80
2.95 - 3.54
3.74 - 4.92
≥ 4.92
4.5
4.9
5.6
6.3
3.6
4.0
4.5
5.0
11
11
15
15
18
18
18
18
18
18
18
18
18
18
18
27
18
27
27
27
XPA, SPA
0.51
0.39
3.15 - 3.94
4.17 - 5.51
5.91 - 7.87
≥ 7.87
6.3
8.5
10.1
11.2
5.0
6.8
8.1
9.0
15
15
18
18
18
18
18
18
18
27
27
27
27
27
27
27
27
27
27
38
XPB, SPB
0.63
0.51
4.41 - 6.30
6.69 - 8.82
9.29 - 13.98
≥ 13.98
11.2
13.9
17.3
18.2
9.0
11.2
13.8
14.6
18
18
18
18
18
27
27
27
27
27
38
38
27
38
38
38
38
38
38
38
XPC, SPC
0.87
0.71
8.82 - 9.84
10.43 - 13.98
≥ 14.76
19.6
25.9
32.4
15.6
20.7
25.9
18
27
27
27
38
38
38
38
38
38
45
45
38
45
45
Z
0.39
0.24
2.20 - 3.94
1.1 - 1.7
11
11
11
15
15
A
0.51
0.31
3.15 - 5.51
2.2 - 3.4
11
15
18
18
18
B
0.67
0.39
4.92 - 7.87
4.5 - 6.7
15
18
18
27
27
C
0.87
0.47
7.87 - 15.75
9.0 - 13.5
18
27
27
38
38
D
1.26
0.75
13.98 - 23.62
15.7 - 23.6
18
27
38
38
45
* General basic selection criteria:
F resulting tensioning force by a pre-tension angle of 20° (see table page 4.5)
FI initial operation test-force according guidelines of the belt manufacturer
z quantity of belts in drive
2 multiplier for the compensation of belt-slippage and/or of centrifugal force generated on belt strands.
**required test-force for belt deflection of 0.63 inch per 39.37 inch of centre distance.
The relevant deflection by shorter or longer centre distance has to be interpolated accordingly.
b) Modalities of tensioning
F = FI · z · 2
0.63 inch belt deflection
per 39.37 inch centre distance
Tensioning from “inside” of the belt drive with grooved pulley
– Installation in slack span of the belt drive, make sure that the belts are
maintaining sufficient contact-arc on the driver- and driven-pulley.
– By extremely long centre distances between driver and driven pulley it is recommendable to use on the tensioner a deep-grooved
pulley to avoid excessive slack beating.
Tensioner Devices
See also complementary mounting instructions on page 4.5.
Tensioning with flat roller on belt back
– The diameter of the flat tensioning roller should at least measure 2 ⁄3
of the diameter of the smallest pulley in the drive.
– The width of the tensioning roller should be at least 20% wider than
the overall width of the belt set.
– Installation on the belt back in the slack span, make sure that the
belts are maintaining sufficient contact-arc on the driver and driven
pulley.
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4.11
ROSTA Tensioner Devices and
Accessories to meet individual
customer requirements
J
H
N
A
Support bracket type WS
M
B
O
For the easy mounting of all
standardized ROSTA Tensioners (except SE 50).
C
D
G
E
F
L
K
Type
Art. No.
WS 11
WS 15
WS 18
WS 27
WS 38
WS 45
06590001
06590002
06590003
06590004
06590005
06590006
suitable to
A
B
C
D
E
F
G
H
J
K
L
M
N
O
0.26
0.33
0.41
0.49
0.65
0.81
0.22
0.26
0.33
0.41
0.49
0.49
0.28
0.28
0.37
0.45
0.55
0.71
0.30
0.30
0.39
0.49
0.59
0.79
1.18
1.57
1.97
2.56
3.15
3.94
0.51
0.51
0.61
0.85
0.94
1.18
0.45
0.53
0.65
0.83
0.83
1.02
1.06
1.34
1.69
2.24
2.60
3.15
0.16
0.20
0.24
0.31
0.31
0.39
1.77
2.17
2.76
3.54
4.33
5.51
1.18
1.26
1.50
2.05
2.17
2.60
1.81
2.28
2.91
3.86
4.57
5.51
1.38
1.73
2.17
2.95
3.35
4.33
0.39
0.47
0.79
0.98
1.38
1.57
Size SE
11
15
18
27
38
45
Safety Sockets SS 27 and SS 38
Tensioner Devices
By uneven surfaces and/or by paint
coatings, which are giving insuffi­
cient friction locking, the positioning
and further re-tensioning can be
made with these standardized Safety
Sockets.
4.12
suitable to
Type
Art. No.
SS 27
SS 38
06618400
27
06618394
38
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Size SE
A
E
F
Weight
B
C
D
4.09
5.12
2.36
0.51
0.31
3.11
0.8
5.04
6.34
2.95
0.67
0.39
3.80
1.4
[lb]
Weight
[lb]
0.2
0.3
0.6
1.5
2.0
4.0
Guide roller suspensions with tensioners SE and
pre-tensioning devices VS
For the accurate definition of the required pre-tension and
limitation of the roller travel we do recommend the use of
our pre-tensioning clamp VS allowing angle adjustments
from 0 – 15° (for all SE-sizes available).
DAT (Double Arm Tensioner)
Tensioner Devices
For the transfer of very high tension-forces we do recommend to use this double arm tensioner, avoiding any misalignment or fault of parallelism between tensioner housing
and inner square-core-generating belt eating angular off-set
of the tensioning pulley.
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4.13
Elastic suspension of conveyor belt scrapers with tensioner devices SE
The ROSTA suspension is offering continuous and wear compensating cleaning
pressure on conveyor belt scrapers to abrade small particle sizes.
For belt widths:
– 15.75 - 23.62 in = 2 units SE 18
– 23.62 - 31.50 in = 2 units SE 27
– 31.50 - 39.37 in = 2 units SE 38
– 39.37 - 51.18 in = 2 units SE 45
ROSTA Tensioner Devices type SE-F (W) 38
for the Bus Industries
Today, nearly all busses for passenger transport are
equipped with an air-conditioning system.
Tensioner Devices
The Diesel engine of the bus serves thereby as energy source of the cooling compressor. The piston- or
rotation compressors are driven via V- or Poly-V-belts
from the spur wheel of the main engine. This belt
transmission requires a slippage-free power train to
ensure the full capacity of the cooling compressors.
4.14
ROSTA designed for this specific application a heat
resistant tensioner – powerful, compact with a long
compensation travel.
Different versions available. Please do not hesitate to
contact ROSTA directly.
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ROSTA belt and chain tensioners …
… a success story!
These simple, maintenance-free and automatic re-tensioning ROSTA machine components very quickly became
established in general machinery and system construction, and, thanks to good marketing, demand from all
over the world increased rapidly. Even today, several
hundred thousands of these blue tensioning elements are
being manufactured at ROSTA AG and by two licensees
every year.
Original ROSTA belt and chain tensioners – often copied but never
matched!
Tensioner Devices
In the year 1961, a foreman at ROSTA AG became annoyed about the tedious and ever recurring re-tensioning
of the belt on a large ventilator. Without a moment’s hesitation, he sawed an old ROSTA rubber suspension axle
in two and fitted a ten­sion roller onto the lever arm – the
automatic belt tensioner was born. People at ROSTA AG
were very happy about this “inven­tion” by the foreman –
but it took a full 2 years before the owner of the company had the idea of commercialising this application, and
of offering standardized chain and belt ten­sioners worldwide.
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4.15
Strained Applications!
Tensioner Devices
A few examples:
Changes regarding contents reserved.
Any reprint, also in extracts, requires our explicit and confirmed approval.
ROSTA USA Corp.
1425 Kalamazoo Street
South Haven, MI 49090
Toll-free:888-506-1634
Phone: 269-841-5448
Fax:269-924-0952
E-Mail: info@rosta.com
Internet:www.rosta.com
T2014.871
ROSTA