Poly
Belts
" DARWIN "
Introduction
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DARWIN
Multi-Rib poly belt is a cable cord reinforced transmission belt with 'V'
shaped ribs along the circumference of the belt. It is flexible,
with high power capacity per unit width and is designed on
completely integrated construction. The ribbed surface provides
maximum area of contact and reduced face pressure.
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The poly belt is
gaining wide acceptance in the automotive field due to the advantages it
exhibits over conventional V-belts. Poly Belts are particularly good for high speed
and/or high ratio applications which conventional belts are unable to
handle. The smooth, vibration free performance and excellent reverse bend
characteristics of this belt enable the design of single belt, compact
drive systems.
Poly Belts have been selected for use on many applications.
These applications range from the single multi-rib accessory drive concept
(SMAC) for passenger cars to water pump, alternator, and air conditioning
drives on heavy trucks. In addition, some fan drives on construction
equipment are being placed in production.
Construction
Features of DARWIN Poly Belts
Poly
Belt sections which are designated by the letter "K" and
"J" are easily identifiable below by measuring the distance between
the adjacent ribs within a belt. The "J" section belt has a
smaller rib than the "K" belt and the overall thickness of the
"J" is less than the "K".
| Profile |
Pitch:
P
(mm) |
Height
of Rib: ht
(mm) |
Height
of Belt: H
(mm) |
| H |
1.6 |
1.1 |
3.0
±0.15 |
| J |
2.34 |
1.8 |
3.9
±0.25 |
| K |
3.56 |
2.4 |
5.5
±0.30 |
| L |
4.7 |
4.6 |
9.0
±0.40 |
| M |
9.4 |
9.4 |
16.0
±0.60 |
DARWIN POLY BELTS are
available in various sizes for automotive sector.
Notation
Example :
| 6 |
PK |
1220 |
| No.
of ribs |
Section |
Effective
length
in mm |
Special Features
-
Highly
flexible and can be used with smaller pulley diameter resulting in
lighter and compact drive.
-
Higher
power rating per unit width compared to conventional belt - 40%
higher.
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Almost
eliminates the slippage due to maximum wedge contact on the pulleys.
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Being
thinner, the rear side can be used to drive additional accessories /
idlers without affecting belt life.
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Gives
noise-free power transmission in every application.
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Eliminates
the necessity to use multiple / matched set of belts.
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Can be
used at higher speed more than 40 m/sec.
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Gives
lesser wear and longer life to the pulleys due to lesser static
tension and belt slippage.
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Reduces
down time and hence belt replacement cost.
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The
design of the Poly V belt allows placement of the tensile member
across the total width of the belt, therefore obvious that the Poly V
belt will exhibit superior strength to a V-belt of equal width.
Maximum tolerance of effective lengths
| Effective
length |
Maximum
tolerance ( mm) |
| H |
J |
K |
L |
M |
| 375
< Le <= 750 |
+5
-10 |
+5
-10 |
+5
-10 |
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| 750
< Le <= 1000 |
+6
-12 |
+6
-12 |
+6
-12 |
+6
-12 |
|
| 1000
< Le <= 1500 |
+8
-16 |
+8
-16 |
+8
-16 |
+8
-16 |
|
| 1500
< Le <= 2000 |
+10
-20 |
+10
-20 |
+10
-20 |
+10
-20 |
|
| 2000
< Le <= 3000 |
+12
-24 |
+12
-24 |
+12
-24 |
+12
-24 |
+12
-24 |
| 3000
< Le <= 4000 |
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+15
-30 |
+15
-30 |
| 4000
< Le <= 6000 |
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+20
-40 |
+20
-40 |
| 6000
< Le <= 8000 |
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+30
-60 |
+30
-60 |
| 8000
< Le <= 12500 |
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+45
-90 |
| 12500
< Le <= 17000 |
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+60
-120 |
Note:
1. Maximum tolerance of effective length can
be calculated approximately as follows:
top tolerance= +0.004 x Le and bottom tolerance =
-0.008 x Le (Le: effective length)
2. Maximum tolerance of effective length
conforms to what is stipulated in ISO/CD 9982-1995.
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