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PUFlex GS Couplings

PUFLEX GS couplings are the three piece assembly of 2 no. Aluminium Alloy or Steel hubs and one Special Grade Polyurethane Spider. These three pieces are co-axially and with certain positive pre-stress are assembled to complete the PUFLEX GS coupling. After assembly these couplings becomes sufficient flexible, backlash-free, positive motion and power transmitting fail safe coupling elements. Due to polyurethane spider, both the metallic hubs are separated from each other to avoid there physical contact. This helps to avoid the electrical and frequency isolation of both the connected driver and driven elements.

Download PUFlex GS Couplings Catalogue

 

APPLICATION

  • Shaft Encoders
  • Tacho-generators
  • Servo Motors
  • Stepper Motors
  • Ball-screws
  • CNC machines
  • X-Y slides
  • Medical Equipment’s
  • Precise Spindles,
    and much more precise backlash-free motion and power transmission applications.

BENIFITS

  • Flexible
  • Backlash-free
  • No maintenance
  • No Lubrication
  • Failsafe
  • Uniform & Positive motion and power transmission
  • Electrical and frequency isolation
  • Available in Unbored
  • pilot bore and finish bore and key-ways.

HUB & SPIDER DETAILS


HUB DETAILS

  • PUFLEX GS hubs are available in Aluminium and Steel Material.
  • PUFLEX GS sizes from 9 to 38 are made from Aluminium Alloy material.
  • PUFLEX GS sizes from 42 to 65 are made from Steel.
  • PUFLEX GS hubs are manufactured with high precision machining.
  • The jaws are machined with concave shape and entry chamfer for easy assembly.
  • The concave shape in jaws of hub and the convex shape on the polyurethane spider allows for better angular, parallel and axial misalignment.
  • These hubs are available in un-bored, pilot bored, finish bore & key-ways, and with different styles of clamping arrangements as per customer requirements.

SPIDER DETAILS

  • PUFLEX GS spiders are manufactured from high grade polyurethane.
  • PUFLEX GS are available in three different hardness as 80 Shore A, 92 Shore A, and 98 Shore A. This different hardness’s are made available to suit different applications.
The details are as below.

Spider Type
Shore Hardness
Colour Material Temperature Range ° C  Available sizes Application
Normal working Maximum
80 Shore A Blue Polyurethane from -50 to + 80 from -60 to + 120 PUFlex 5 to 24 Low torque,
more mis-alignment
92 Shore A Yellow Polyurethane from -40 to + 90 from -50 to + 120 PUFlex 5 to 55 Medium torque,
medium mis-alignment
98 Shore A Red Polyurethane from -30 to + 90 from -40 to + 120 PUFlex 5 to 65 More torque,
less mis-alignment

TECHNICAL DETAILS




Dimentional details

Size
PUFlex
GS
Bore Sizes 
mm
Overall Dimentions  Set Screw Type Clamping Hub Type Screw
Tightening 
Torque
Minimum Maximum Outer 
Dia.
Spider
I.D.
Total
Length
Hub
Length
Space
Betⁿ
Hubs
Spider
Width
Isolation
Gap
Spider
Wall

Thickness
Screw
Size
Distance
from
edge
Screw
Size
Distance
from
edge
Max.
Dia.
Set
Screw 
Clamping 
  d1 d2 d2 d3 l₁ &l₂ E b a l₃ S l₄ Dmax Ts Nm
9 4 11 9 20 7 30 10 10 8 1 1.5 M4 5 M3 5 23.4 1.5
14 6 16 14 30 10.5 35 11 13 10 1.5 2 M4 5 M3 5 32.2 1.5
19/24 6 24 24 40 18 66 25 16 12 2 3 M5 10 M6 12 45.5 10.5
24/28 8 28 28 55 27 78 30 18 14 2 3 M5 10 M6 12 56.4 10.5
28/38 10 38 38 65 30 90 35 20 15 2.5 4 M6 15 M8 14 72.6 10.5
38/45 12 45 45 80 38 114 45 24 18 3 4 M8 15 M8 20 83.3 25
42 14 55 55 95 46 126 50 26 20 3 4 M8 20 M8 20 79 25
48 15 62 62 105 51 140 56 32 28 3.5 4 M8 20 M10 22 91 70
55 22 70 70 120 60 160 65 30 22 4 4.5 M10 20 M12 25 105 120


Technical Details

Size Spider 
Hardness
Rated
Torque

Nm
Max RPM Dynamic
Torsional

Stiffness

Nm/rad
Radial
Stiffness

N/mm
Weight
Kg
Moment
of 
Inertia
Kgcm²
Set Screw Clamping Hub
9 80 Shore A 1.8 28000 22500 52 125 0.019 0.011
9 92 Shore A 3 28000 22500 95 262 0.019 0.011
9 98 Shore A 5 28000 22500 155 518 0.019 0.011
14 80 Shore A 4 15900 12700 180 153 0.05 0.062
14 92 Shore A 7.5 15900 12700 344 336 0.05 0.062
14 98 Shore A 12.5 15900 12700 513 604 0.05 0.062
19/24 80 Shore A 4.9 11900 9550 1030 582 0.16 0.39
19/24 92 Shore A 10 11900 9550 1720 1120 0.16 0.39
19/24 98 Shore A 17 11900 9550 2580 2010 0.16 0.39
24/28 92 Shore A 35 8850 6950 4296 1480 0.33 1.60
24/28 98 Shore A 60 8850 6950 6189 2560 0.33 1.60
28/38 92 Shore A 95 7350 5850 6876 1780 0.56 3.80
28/38 98 Shore A 160 7350 5850 10314 3200 0.56 3.80
38/45 92 Shore A 190 5950 4750 13752 2350 1.10 10.00
38/45 98 Shore A 325 5950 4750 21486 4400 1.10 10.00
42 92 Shore A 265 5000 4000 14490 2430 1.85 22.50
42 98 Shore A 450 5000 4000 48000 5570 1.85 22.50
48 92 Shore A 310 4550 3600 18055 2580 2.50 46.00
48 98 Shore A 525 4550 3600 55925 5930 2.50 46.00
55 92 Shore A 410 3950 3150 21850 2980 4.10 85.25
55 98 Shore A 685 3950 3150 59500 6686 4.10 85.25

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