v belt drives

1. WELCOME
TO
SEMINAR
ON
V-BELTS & DRIVES

2. V-BELTS
RAW EDGE
COGGED BELTS
SPACE SAVER
WEDGE BELTS
POLY-V BELTS

3. TOP RUBBER
LOAD CARRYING CORDS
BASE RUBBER
RUBBER IMPREGNATED
FABRIC JACKET
INCLUDED ANGLE40º
CROSS–SECTION OF V-BELT

4. STIFF YET FLEX-CRACK RESISTANT POLYMER POLY FLOCK
(POLY-F) COMPOUND FOR HIGHER LIFE
RUBBERISED POLYESTER-COTTON BLENDED JACKET FOR
FLEXIBILITY, BETTER TRACTION, FLEX & WEAR
RESISTANCE
 NEOPRENE IMPREGNATION & SPECIAL ADDITIVES
MAKE BELTS HEAT RESISTANT, OIL RESISTANT & ANTI-STATIC
SPECIAL ‘HMLS’ (HIGH MODULUS LOW STRETCH) POLYESTER
CORDS CARRY HIGHER LOADS WITH MINIMUM STRETCH
THE UNIQUE “HSS” PROCESS OF HEAT STRETCHING &
LENGTH SETTING ENSURES THAT BELTS RETAIN THE
TENSION AND STAY MATCHED NOT ONLY IN STORAGE BUT
ALSO ‘ON THE DRIVE’.
BELTS REQUIRE `ONE SHOT TENSIONING’
SO YOU CAN ‘FIT THEM & FORGET THEM’……..

5. TYPES OF V-BELTS & SECTION

6. SPACE SAVER WEDGE BELTS

7. • Wedge Belts drives are extraordinarily compact as they are
capable of handling more power in a given space over Classical
V-Belts of A, B, C, D & E Sections.
• Narrower in cross section increases support for
tension members in Wedge Belts and hence can not buckle.
• Due to wedge belt pulley compactness reduce overhung thus
improving the bearing life and in totality reducing the initial
drive cost
SPACE SAVER WEDGE BELTS

8. Option-1 Option-2
Motor Pulley size 660 mm Pitch Dia. with 34
Grooves of E-Section
660 mm Pitch Dia. with 36
Grooves of SPC-Section
725 mm Pitch Dia. with 32
Grooves of SPC-Section
Pulley Face
Width 1540 mm. 935 mm. 832 mm.
Weight (approx.) 1500 Kg. 915 Kg. 850 Kg.
COST (approx.) Rs. 1.75 Lac Rs. 1.45 Lac. Rs. 1.30 Lac
Driven Pulley
size
1575 mm Pitch Dia. with 34
Grooves of E-Section
1575 mm Pitch Dia. with 36
Grooves of SPC-Section
1735 mm Pitch Dia. with 32
Grooves of SPC-Section
Pulley Face
Width 1540 mm. 935 mm. 832 mm.
Weight (approx.) 4100 Kg. 2780 Kg. 2544 Kg.
COST (approx.) Rs. 5.50 Lac Rs. 4.40 Lac Rs. 3.90 Lac
Belt Size E-418 / E-10710 x 34 Pcs. SPC-10600 x 36 Pcs. SPC-10600 X 32 Nos.
COST (approx.) Rs. 2.65 Lac @ 7835/- Rs. 1.30 Lac @ 3631/-
Rs. 1.16 Lac @3631
TOTAL COST Rs. 9.90 Lac Rs. 7.15 Lac Rs. 6.36 Lac
Description E-Section V-Belt Drive SPC-Section Wedge Belt Drive
For a 1500 HP drive with 740 R.P.M. Motor and Driven speed of 310 R.P.M.,
The conventional E-section drive Vs SPC-Section Wedge Belt Drive details :-

9. The distinct benefits of the Wedge Belt Drive are :-
1. The total Pulley-Belt package cost reduces by
∀• Option –1 : 28% (approx.)
∀• Option – 2 : 36% (approx.)
2. The replacement cost of belts would reduce by
∀• Option – 1 : 51% (approx.)
∀• Option – 2 : 56% (approx.)
3. Reduces shaft Bending moments & Bearing loads improving the Bearing life
substantially due to lighter weight / lesser face width of SPC Wedge belt pulleys.
4. Improves power transmission efficiency.

10. LENGTH STABLE
POLYESTER CORD
MOULDED COG
FABRIC
POWERFLEX RAW EDGE COGGED BELTS

11. POWERFLEX RAW EDGE COGGED BELTS

12. POWERFLEX RAW EDGE COGGED BELTS
Features
 Very high flexibility due to moulded cogs.
 Excellent transverse rigidity because of Polychloroprene
rubber based compound with an-isotropic fiber orientation.
 Very low stretch due to use of length stable polyester cords
prepared with special adhesives.
 Higher power rating of up to 30% over wrapped V-Belts. Three
times more life. The higher power rating of Power flex means that
they have more kW hours built into them. So they last 3 times
longer when replacing wrapped V-belts utilising existing pulleys.
 Low slip due to better arc of contact and pulley to belt
geometrical relationship.
 Energy loss reduced to an absolute minimum.
 Drive ratios of 1:12 are possible which can eliminate multi-stage drives.

13. PRODUCT DETAILS
CAN BE PRODUCED IN HIGH POWER CONSTRUCTIONS ALSO.
N - SPECIFIES THE NO. OF BELTS PER BAND
BELT CROSS-SECTION
66" - 148"
66" - 148"
66" - 590"
66" - 148"
SIZE RANGE
BANDED BELTS - CLASSICAL & WEDGE
3V
SECTION
C
B
A
MAX. NO. OF BELTS/BANDTHICKNESS, mm
10.30 x N
25.40 x N
19.05 x N
15.38 x N
BELT WIDTH, mm
10.00
17.00
13.00
10.00
10.30
25.40
19.05
15.38
PITCH, mm
6
4
6
8
5V 105" - 175" 17.50 x N 16.00 17.50 6
525.5021.0025.50 x N105" - 590"SPC
176" - 590"5V 17.50 x N 16.00 17.50 5
BANDED V BELTS

14.  ELIMINATE BELT WHIP, BELT TWIST AND BELT
TURN OVER
 IDEAL FOR DRIVES WHERE PULSATING
LOADS ARE PRESENT
 DO NOT REQUIRE SPECIAL PULLEYS
BANDED V BELTS

15. POLY-V BELTS

16. POLY-V BELTS
 COMPACT DRIVE
Poly-V belt is highly flexible and hence can be used with smaller pulley
diameter – lighter and compact drive.
 HIGHER POWER
Higher power rating per unit width compared to conventional V-belt -
40% higher
 ZERO SLIPPAGE
Eliminates the slippage due to maximum wedge contact on the pulleys.
 REAR SIDE CAN ALSO DRIVE
Being thinner the rear side can be used to drive additional accessories /
idlers without affecting life.
 HIGHER BEARING LIFE
Lesser static tension gives higher bearing life.
 SILENT DRIVE
Gives vibration and noise free power transmission in
every application.

17.  SINGLE BELT
Eliminates the necessity to use multiple / matched set
belts.
 HIGHER SPEED
Can be used at higher speed more than 40 m/sec.
 LONGER LIFE
Gives less wear and longer life to the pulleys due to
less static tension and belt slippage.
 LOW DOWNTIME & REPLACEMENT COST
Reduces down time and also belt replacement cost.
POLY-V BELTS

18. DO’S & DONT’S OF V-BELTS
Drive Designing
When assessing the power requirements of the drive, do not forget to apply
the appropriate service factor for the combination of prime mover and driven
machine.
Consider not only the running characteristics of the machines(I.e. smooth,
heavy shock, pulsating), but also any abnormal loads applied during starting
by high torque motors, or the inertia of the driven machine.
Pulley Diameter Selection
Pulley diameters should be proportionate to the other components in the
drive. Minimum diameter pulleys cause an unnecessary flexing of the belts
and may lead to premature bearing failure on the machines. Large pulleys
have obvious space and cost disadvantages.
Minimum Recommended Pulley Diameters
Given below are the minimum recommended pulley diameters for various
sections of the belts for improved flex life.
A B C D E SPZ SPA SPB SPC
80 125 200 315 500 67 90 160 224

19. DO’S & DONT’S OF V-BELTS
Belt Guards
Drives should not be completely enclosed by
guards. Open mesh guards which allow normal air
circulation but prevent any accidental contact with
the drive are recommended.
Belt Storage
Belts should not be subjected to extremes of heat
and cold. Standard belts can tolerate a considerable
range of temperatures between –18 Deg C & +60 Deg
C without damage. Drives designed outside this
range will require special belts. Certain belts have a
flame-resisting ability and will self-extinguish
quickly in the case of fire. These belts should be
used wherever there is danger of explosion.
Alignment of pulleys and belts
Check sheave alignment. Misalignment of sheave
will shorten the belt life. Keep deflection angle less
then 1/3 degree

20. DO’S & DONT’S OF V-BELTS
Pulley grooves
Uneven sheave grooves mismatched belts.
Check grooves for wear. More than 1/32”(0.794
mm) of dished out may lead to shorten belt life.
Installation of V-belts
Slack off on take-up until belts can be places in
grooves without forcing. Never pry the belts
into the sheave grooves to prevent cords
break. Give proper tension on V-belts.
Check bearings or oil

21. Driving
Pulley
Driven
Pulley
SLACK SIDE
TIGHT SIDE
T2e T2e
T1e T1e
TENSIOING OF BELT DRIVES

22. Belt Tension Indicator
10 20 30 40 50 60 14 12 10 8 6 4 2
mm kg
Deflection in mm Deflection Force in kg
Belt Tension Indicator
16mm deflection per metre of span
applied to mid-span

23. As the high performance of V-Belts requires correct tension, we
recommend using the Belt Tension Indicator.
Method of Belt Tensioning
1. Measure the span length
2. Multiply the span length in metres by 16 to obtain the
deflection distance in mm.
3. Set the lower marker ring at the deflection distance required
in mm on the lower scale.
4. Set the upper marker ring against the bottom edge of the top
tube.
5. Place the belt tension indicator on top of the belt at the centre of
span, and apply a force at right angles to the belt deflecting it to
the point where the lower marker ring is level with top of the
adjacent belt.
6. Read off the force value indicated by the top edge of the upper
marker ring.

24. Belt
Section
SPZ SPA SPB SPC Z A B C
Small
Pulley
Dia
(mm)
56
to
95
100
to
140
90
to
132
140
to
220
140
to
224
236
to
315
224
to
355
375
to
560
56
to
100
80
to
140
125
to
200
200
to
400
Newton
(N)
10
to
15
15
to
20
20
to
27
28
to
35
35
to
50
50
to
65
60
to
90
90
to
120
5
to
7.5
10
to
15
20
to
30
40
to
60
Kilogram
- force
(kgf)
1.0
to
1.5
1.5
to
2.0
2.0
to
2.7
2.8
to
3.5
3.5
to
5.1
5.1
to
6.6
6.1
to
9.2
9.2
to
12.2
0.5
to
0.8
1.0
to
1.5
2.0
to
3.1
4.1
to
6.1
If the measured force falls within the values given, the drive will be
satisfactory. A measured force below the lower value indicates under-
tensioning.
A new drive should be tensioned to the higher value to allow for the normal
drop in tension during the running-in period.
After the drive has been running for a few hours the tension should be
checked and re-adjusted to higher the value.

25. EFFECT OF UNDER-BELTING
IN A 5 BELT DRIVE
NO. OF BELTS % UNDER LIFE
BELTING EXPECTANCY
5 NIL 100%
4 20% 45%
3 40% 17%

26. CAUSES OF V-BELTS FAILURE AND REMEDIES

27. CAUSES OF V-BELTS FAILURE AND REMEDIES

28. CAUSES OF V-BELTS FAILURE AND REMEDIES

29. CAUSES OF V-BELTS FAILURE AND REMEDIES

30. CAUSES OF V-BELTS FAILURE AND REMEDIES

31. CAUSES OF V-BELTS FAILURE AND REMEDIES

32. V-BELTS PULLEY’S TYPE

33. DIMENSIONS OF STANDARD V-GROOVED PULLEY
The maximum distance 'L' between the outside edges of the pulley, i.e.
the face width is equal to (x-1) e + 2f (where x is the number grooves)

34. CROSS
SECTION
GROOV
PITCH
WIDTH
(Wp)
MINIMUM
DISTANCE
FROM
OUTSIDE
DIAMETER
TO PITCH
DIAMETER
(b) mm
MINIMUM
GROOVE
DEPTH
BELOW
PITCH
DIAMETER
(h) mm
CENTER TO
CENTER OF
GROOVE
(e) mm
EDGE IF
PULLEY TO
1ST
GROOVE
CENTER
(f) mm
PITCH
DIAMETER
(dp)mm
GROOVE
ANGLE (ө)
MINIMUM
TOP
WIDTH
OF
GROOVE
(g) mm
Z,SPZ 8.5 2 9 12 ± 0.3 8.0 ± 1.0 UPTO 80 34 ± 0.25 9.7
ZX,SPZX OVER 80 38 ± 0.25 9.9
A, SPA 11 2.75 11 15 ± 0.3 10 + 2.0 UPTO 118 34 ± 0.25 12.7
AX, SPAX -1.0 OVER 118 38 ± 0.25 12.9
B,SPB 14 3.5 14 19 ± 0.4 12.5 + 2.0 UPTO 190 34 ± 0.25 16.1
BX,SPBX -1.0 OVER 190 38 ± 0.25 16.4
C,SPC 19 4.8 19 25.5 ± 0.5 17 + 2.0 UPTO 315 34 ± 0.25 21.9
CX,SPCX -1.0 OVER 315 38 ± 0.25 22.3
D 27 8.1 19.9 37 ± 0.6 24 + 3.0 UPTO 475 36 ± 0.25 32.3
-1.0 OVER 475 38 ± 0.25 32.6
E 32 9.6 23.4 44.5 ± 0.7 29 + 4.0 UPTO 610 36 ± 0.25 38.8
-1.0 OVER 610 38 ± 0.25 39.3
3V,3VX 8.9 0.64 8 10.3 ± 0.4 8.7 + 2.0 UPTO 88 36 ± 0.25 10.7
-0.8 88 TO 152 38 ± 0.25 10.8
152 TO 305 40 ± 0.25 10.9
ABOVE 305 42 ± 0.25 11.0
5V,5VX 15.24 1.27 13.7 17.5 ± 0.4 12.7 + 3.0 UPTO 254 38 ± 0.25 18.0
-1.0 254 TO 406 40 ± 0.25 18.18
ABOVE 406 42 ± 0.25 18.36
8V,8VX 25.4 2.54 22.6 28.6 ± 0.4 19 + 6.0 UPTO 406 38 ± 0.25 29.97
-1.5 406 TO 569 40 ± 0.25 30.25
ABOVE 569 42 ± 0.25 30.50

35. NOTE :
1) See figure for symbol.
2) The tolerance on dimension apply to the distance between the centre of any
two grooves whether adjacent or not.
3) It is recommended that the tolerance on dimension should be taken into
account in the alignment of the pulleys.
4) When the pulleys are to be used for V-Belts Z, A, B, C only, dimension 'h'
may be reduced by 20 %.
5) Only above dimension pulleys should be used for Banded belts except for 'A'
section, where e = 15.9 mm.
The tolerance for side wobble and for run out (eccentricity), in mm per
millimeter of pulley diameter shall be as follows :
Pulley diameter < 500 mm ± 0.001 mm
500 mm < Pulley diameter < 1500 mm ± 0.0015 mm
Pulley diameter > 1500 mm ± 0.002 mm

36.  Standard range of metric
pulleys
 Dual duty grooves to perfectly
match Classical ‘V’ & Space
Saver Wedge Belts
 Conform to IS 3142 groove
specifications
Speed ratios up to 1:7
 Standard MOC Cast Iron Grade 20 IS:210
 Pulleys with other grades of Cast Iron and Cast steel
are also offered on request

37. TAPER LOCK BUSHES
Easy & quick ‘shrink fit’ on the shafts by using only
Allen-key.
Available with finished bore & keyway in both metric
& imperial sizes.
Interchangeable between many products such as
Pulleys, Couplings, Sprockets etc.
Accommodates shaft tolerances + 0.051mm(0.002”)
to - 0.127mm(0.005”).

38. TAPER LOCK BUSHES - FIXING
=> Each component has three
similarly located half holes
parallel to the axis.
=>In the hub two these are full
length tapped and
corresponding hole in the taper
lock bush is not tapped or part
way through.
=> When tightened in the two
threaded holes in the hub the
screws touches bottom in the
plain hole of the bush and forcing
it into the taper.
=>To release the taper grip and
withdraw the bush from the hub,
two screws are removed and one
of them is tightened into the

39. Types of coupling misalignment.

40. STANDARD
COUPLING
STANDARD SPACER
COUPLING
EXTERNAL SPIDER
COUPLING
EXTERNAL SPIDER
SPACER COUPLING
ESSEX FLEXIBLE JAW COUPLING

41. CUSHION COUPLING CUSHION SPACER
COUPLING
ESSEX FLEXIBLE JAW COUPLING

42.  Absorbs shocks & damps small amplitude
vibrations.
 Caters incidental angular, parallel & axial
misalignment
Lubrication not required
 Nitrile Rubber elastomeric inserts to withstand
temperatures from - 40 Deg to +100 Deg C
 Spacer coupling with spacer size depending upon
the DBSE
 MOC CI Grade 20 IS:210
ESSEX FLEXIBLE JAW COUPLING

43. Thank you