Tyre Couplings

Polydrive Tyre couplings provide all the desirable features of an ideal flexible coupling, including Taper Lock fixing in India. The Polydrive Tyre coupling is a “torsionally elastic” coupling offering versatility to designers and engineers with a choice of flange combinations to suit most applications.
The flanges are available in either F or H version Taper Lock fitting or bored to size B.
With the addition of a spacer flange, the coupling can be used to accommodate standard distance between shaft ends and facilitate pump maintenance.
Polydrive Tyre couplings can accommodate simultaneous maximum misalignment in all planes without imposing undue loads on adjacent bearings and the excellent shock-absorbing properties of the flexible tyre reduce vibrations and torsional oscillations.
Polydrive tyres are available in natural rubber compounds for use in ambient temperatures between -50°C to +50°C Neoprene rubber compounds are available for use in adverse operating conditions e.g. oil or grease contaminations and can be used in temperatures of – 15°C to + 70°C
F.R.A.S. tyres are available for use when fire-resistance and antistatic (F.R.A.S.) properties are required.

Torque-bore range :

The range includes couplings with torque capacity upto 12606 Nm. and bore diameters upto 190 mm.

Misalignment :

Handles parallel, angular and axial displacements, either singly or in any combination. They can accommodate parallel misalignment upto 6 mm, angular misalignment upto 4O and end float upto 8 mm.

Torsionally Soft :

Cushions against destructive shock loads protecting the complete system, preventing expensive breakdowns and lengthens machine life.

Torque-bore range :

The range includes couplings with torque capacity upto 12606 Nm. and bore diameters upto 190 mm.

Misalignment :
Handles parallel, angular and axial displacements, either singly or in any combination. They can accommodate parallel misalignment upto 6 mm, angular misalignment upto 4O and end float upto 8 mm.
Torsionally Soft :
Cushions against destructive shock loads protecting the complete system, preventing expensive breakdowns and lengthens machine life.
Free of Backlash :
Does not create ‘snatch’ on take up of the drive.
Installation :
Requires neither special tools nor skilled labour to assemble. Alignment is quickly checked by placing a straight edge across outside diameter of flanges. The split flexible tyre is then positioned in the flanges and the screws tightened into place.
Damping :
Reduces vibration and torsional oscillations developed in internal combustion engines, the amplitude of which increases greatly at critical points in the speed range. Polydrive Tyre coupling dampens these destructive vibrations.
Maintenance :
Because there are no moving parts, no lubrication is required. Periodic visual inspection of the tyre is all that is necessary.
Easy Element Replacement :
To replace flexible element simply loosen the clamping screws, remove the tyre and replace with a new one. It is not necessary to move either driver or driven machine or coupling flanges.
Environment :
Use of natural or Neoprene rubber compounds makes the Polydrive Tyre coupling suitable for use in most conditions. For fire hazard areas the F.R.A.S. tyre is recommended. This allows free flow of electricity between the two shafts to avoid static electricity build up.

Details required for coupling selection

  • Type of driven machine and operating hours per day.
  • Speed and power absorbed by driven machine (if absorbed power is not known, calculate on power rating of prime mover).
  • Diameters of shafts to be connected.

Procedure

  • Service Factor : Determine the required service factor from table 1.
  • Design Power : Multiply the normal running power by the service factor. This gives the design power which is used as a basis for selecting the coupling.
  • Coupling Size : Refer to table 3 (page 5) and from the appropriate speed, read across until a power greater than that required in step (b) is found. The size of Polydrive Tyre Coupling required is given at the head of that column.
  • Bore Size : Check from dimension tables that chosen flanges can accommodate required bores.

Example

A Polydrive Tyre Coupling is required to transmit 45 kW from an A.C. Electric Motor which runs at 1440 rev/min to a rotary screen for 12 hours a day. The motor shaft is 60 mm diameter and the screen shaft is 55 mm diameter.

  • Service Factor : From table 1, the service factor is 1.4.
  • Design Power : Design Power = 45×1.4 = 63 kW.
  • Coupling Size : By reading across from 1440 rev/min in table 3 (page 5) the first power figure to exceed the required 63 kW in step (b) is 76.1 kW. The size of coupling is F100.
  • Bore Size : By referring to table 2 (page 4) it can be seen that both shaft diameters fall within the bore range available.
Special Cases Type of Driving Unit
For applications where substantial shock, vibration and torque fluctuations occur and for reciprocating machines e.g. internal combustion engines, piston pumps and compressors, refer to Fenner with all machine details for torsion analysis Electric Motors
Steam Turbines		 Internal
Combustion Engines
Steam Engines
Water Turbines

TABLE 1: Service Factors

Type of Driven Machine Operational hours per day
10
and
under		 Over 10
to 16
inclusive		 over
16		 10
and
under		 Over 10
to 16
inclusive		 over
16
CLASS 1
Agitators, Brewing machinery Centrifugal compressors and pumps, Belt conveyors, Dynamometers, Line shafts, Fans upto 7.5 kW, Blowers and Exhausters
(except positive displacement) Generators.		 0.8 0.9 1.0 1.3 1.4 1.5
CLASS 2
Clay working machinery, General Machine tools, Paper mill beaters and winders, Rotary pumps, Rubber extruders, Rotary screens, Textile machinery,
Marine propellers and fans over 7.5 kW.		 1.3 1.4 1.5 1.8 1.9 2.0
CLASS 3
Bucket elevators, Cooling tower fans, Piston compressors and pumps, Foundry machinery, Metal presses, Paper mill calendars, Pulverisers and Positive displacement blowers.		 1.8 1.9 2.0 2.3 2.4 2.5
CLASS 4
Reciprocating conveyors, Gyratory crushers, Mills (ball, pebble and rod), Rubber machinery (Banbury mixers and mills) and Vibratory screens		 2.3 2.4 2.5 2.8 2.9 3.0

TABLE 2 : Dimensions "F&H" and "B" type Couplings

  • Weights given are for min. bore complete coupling.
  • M is the distance between flanges.
  • #Shaft ends, although normally located ‘M’ apart – can project beyond the flanges as shown. In this event, allow       sufficient space between shaft ends for the float and misalignment.
  •  G is the amount by which clamping screws need to be withdrawn to release tyre.
  •  is the wrench clearance to allow for tightening and loosening the bush on the shaft. The use of shortened       wrench will allow this dimension to be reduced.
Size   A C G M No. of screws per flange
Bush No. Max Bore
L
D
E
F
J		 * Approx Weight Kg Max Bore Min Bore
L
D
E
F		 Set Screw on key * Approx Weight Kg
PF40 1008 25 67 - 22 33.5 29 1.4 30 11.00 67 - 22 33.5 M5 2.0 104.0 82 43 23 4
PF45 1108 28 67 - 22 33.5 29 3.0 32 11.00 73 - 25 36.5 M5 2.2 120.0 94 43 23 4
PF50 1210 32 78 79.0 25 39.0 38 3.1 38 16.00 92 79 32 46.0 M5 4.0 133.5 100 43 28 4
PF60 1610 42 86 103.0 25 43.0 38 5.2 48 16.00 112 73 38 43.0 M6 5.0 165.0 125 43 36 5
PF70 1610 42 92 76.0 25 50.0 38 7.4 55 19.05 132 82 45 50.5 M6 8.0 197.0 144 10 42 5
PF80 2012 50 111 95.0 32 53.0 47 9.2 65 25.40 149 95 51 53.0 M10 12.0 211.0 167 10 47 6
PF85 2012 50 112 103.0 32 53.5 47 12.5 70 31.75 154 103 53 53.5 M12 14.0 222.0 179 13 48 6
PF90 2517 60 140 110.0 45 59.5 50 15.0 76 31.75 164 110 57 59.5 M12 15.0 235.0 188 13 50 6
PF100 2517 60 148 124.0 45 61.5 50 20.0 85 31.75 178 124 60 61.5 M12 21.0 254.0 216 13 58 6
PF110 2517 60 140 134.0 45 63.5 50 26.5 90 31.75 180 134 65 53.5 M12 28.0 279.0 233 14 50 6
PF120 3020 75 157 152.0 51 70.0 68 35.5 102 38.10 207 152 76 70.0 M12 41.0 312.0 264 14 55 6
PF140 3535 90 204 194.0 89 76.0 89 67.2 120 75.00 204 195 89 76.0 M20 61.0 359.0 313 14 26 8
PF160 4040 100 220 216.0 102 78.0 110 91.0 140 75.00 220 216 102 78.0 M20 86.0 402.0 345 19 16 8
PF180 4545 110 258 266.0 114 94.0 126 146.0 150 75.00 258 266 114 94.0 M20 141.0 470.0 398 19 30 10
PF200 4545 110 278 266.0 114 103.0 126 182.0 150 75.00 276 266 114 103.0 M20 179.0 508.0 429 19 48 12
PF220 5050 127 312 267.0 127 118.0 140 320.0 160 90.00 312 267 127 118.0 M20 312.0 562.0 474 20 56 12
PF250 - - - - - - - - 190 100.00 360 290 150 125.0 M20 500.0 628.0 532 25 60 12

Table 3 : Physical Characteristics

Size  

A

C		 G M No. of screws per flange
Bush No. Max Bore
L
D
E
F
J		 * Approx Weight Kg Max Bore Min Bore
L
D
E
F		 Set Screw on key * Approx Weight Kg
PF40 1008 25 67 - 22 33.5 29 1.4 30 11.00 67 - 22 33.5 M5 2.0 104.0 82 43 23 4
PF45 1108 28 67 - 22 33.5 29 3.0 32 11.00 73 - 25 36.5 M5 2.2 120.0 94 43 23 4
PF50 1210 32 78 79.0 25 39.0 38 3.1 38 16.00 92 79 32 46.0 M5 4.0 133.5 100 43 28 4
PF60 1610 42 86 103.0 25 43.0 38 5.2 48 16.00 112 73 38 43.0 M6 5.0 165.0 125 43 36 5
PF70 1610 42 92 76.0 25 50.0 38 7.4 55 19.05 132 82 45 50.5 M6 8.0 197.0 144 10 42 5
PF80 2012 50 111 95.0 32 53.0 47 9.2 65 25.40 149 95 51 53.0 M10 12.0 211.0 167 10 47 6
PF85 2012 50 112 103.0 32 53.5 47 12.5 70 31.75 154 103 53 53.5 M12 14.0 222.0 179 13 48 6
PF90 2517 60 140 110.0 45 59.5 50 15.0 76 31.75 164 110 57 59.5 M12 15.0 235.0 188 13 50 6
PF100 2517 60 148 124.0 45 61.5 50 20.0 85 31.75 178 124 60 61.5 M12 21.0 254.0 216 13 58 6
PF110 2517 60 140 134.0 45 63.5 50 26.5 90 31.75 180 134 65 53.5 M12 28.0 279.0 233 14 50 6
PF120 3020 75 157 152.0 51 70.0 68 35.5 102 38.10 207 152 76 70.0 M12 41.0 312.0 264 14 55 6
PF140 3535 90 204 194.0 89 76.0 89 67.2 120 75.00 204 195 89 76.0 M20 61.0 359.0 313 14 26 8
PF160 4040 100 220 216.0 102 78.0 110 91.0 140 75.00 220 216 102 78.0 M20 86.0 402.0 345 19 16 8
PF180 4545 110 258 266.0 114 94.0 126 146.0 150 75.00 258 266 114 94.0 M20 141.0 470.0 398 19 30 10
PF200 4545 110 278 266.0 114 103.0 126 182.0 150 75.00 276 266 114 103.0 M20 179.0 508.0 429 19 48 12
PF220 5050 127 312 267.0 127 118.0 140 320.0 160 90.00 312 267 127 118.0 M20 312.0 562.0 474 20 56 12
PF250 - - - - - - - - 190 100.00 360 290 150 125.0 M20 500.0 628.0 532 25 60 12
  • Weights given are for min. bore complete coupling.
  • M is the distance between flanges.
  • #Shaft ends, although normally located ‘M’ apart – can project beyond the flanges as shown. In this event, allow       sufficient space between shaft ends for the float and misalignment.
  •  G is the amount by which clamping screws need to be withdrawn to release tyre.
  •  is the wrench clearance to allow for tightening and loosening the bush on the shaft. The use of shortened       wrench will allow this dimension to be reduced.
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