The RINGFEDER® barrel coupling consists of a sleeve, made of reinforced-material, equipped with semi-circular internal teeth and a hub, made of reinforced-material, with semi-circular external teeth of the same shape. In the resulting circular recording hardened steel barrel rollers are used, which serve as power transmission elements. Lock rings on both sides of the barrel rollers serve for their axial guidance. Inner and outer covers, each of which is equipped with a lip seal, effectively prevent foreign matter from entering and lubricant from escaping.

The proven design with hub and housing made of high-strength material allows more torque and higher radial force in the same space

TNK TKV

CAD
Identifier
Size
TKmax
Nm
Frad
N
d1kmax
mm
D
mm
L
mm
Lmin
mm
D1
mm
H2
mm
FK
mm
C
mm
WG7125 25 6500 17500 66 250 95 85 95 42 12 220
WG7128 50 8400 20000 77 280 100 85 110 42 12 250
WG7132 75 10500 21500 88 320 110 95 125 45 15 280
WG7134 100 16000 28000 98 340 125 95 140 45 15 300
WG7136 130 21500 37000 112 360 130 95 160 45 15 320
WG7138 160 27000 42500 126 380 145 95 180 45 15 340
WG7140 200 31500 48000 140 400 170 95 200 45 15 360
WG7142 300 39000 53000 155 420 175 95 220 45 15 380
WG7145 400 53500 75000 183 450 185 120 260 60 20 400
WG7151 500 91000 118000 210 510 220 125 295 60 20 460
WG7155 600 127000 132000 220 550 240 125 310 60 20 500
WG7158 1000 180000 145000 250 580 260 130 350 60 20 530
WG7165 1500 241000 184000 295 650 315 140 415 65 25 600
WG7166 2100 360000 283000 305 665 330 145 430 65 25 615
WG7168 2600 425000 330000 315 680 350 145 445 65 25 630
WG7171 3400 529000 366000 335 710 380 165 475 81 35 660
WG7178 4200 660000 420000 380 780 410 165 535 81 35 730
WG7185 6200 815000 490000 425 850 450 165 600 81 35 800
CAD Identifier
Size
TKmax
ft-lbs
Frad
lbs
d1kmax
inch
D
inch
L
inch
Lmin
inch
D1
inch
H2
inch
FK
inch
C
inch
  WG7125 25 4794 3933 2.598 9.843 3.740 3.346 3.740 1.654 0.472 8.661
  WG7128 50 6196 4495 3.031 11.024 3.937 3.346 4.331 1.654 0.472 9.843
  WG7132 75 7744 4832 3.465 12.598 4.331 3.740 4.921 1.772 0.591 11.024
  WG7134 100 11801 6292 3.858 13.386 4.921 3.740 5.512 1.772 0.591 11.811
  WG7136 130 15858 8315 4.409 14.173 5.118 3.740 6.299 1.772 0.591 12.598
  WG7138 160 19914 9551 4.961 14.961 5.709 3.740 7.087 1.772 0.591 13.386
  WG7140 200 23233 10787 5.512 15.748 6.693 3.740 7.874 1.772 0.591 14.173
  WG7142 300 28765 11911 6.102 16.535 6.890 3.740 8.661 1.772 0.591 14.961
  WG7145 400 39460 16855 7.205 17.717 7.283 4.724 10.236 2.362 0.787 15.748
  WG7151 500 67119 26518 8.268 20.079 8.661 4.921 11.614 2.362 0.787 18.110
  WG7155 600 93671 29665 8.661 21.654 9.449 4.921 12.205 2.362 0.787 19.685
  WG7158 1000 132763 32586 9.843 22.835 10.236 5.118 13.780 2.362 0.787 20.866
  WG7165 1500 177754 41351 11.614 25.591 12.402 5.512 16.339 2.559 0.984 23.622
  WG7166 2100 265525 63599 12.008 26.181 12.992 5.709 16.929 2.559 0.984 24.213
  WG7168 2600 313467 74162 12.402 26.772 13.780 5.709 17.520 2.559 0.984 24.803
  WG7171 3400 390175 82252 13.189 27.953 14.961 6.496 18.701 3.189 1.378 25.984
  WG7178 4200 486796 94387 14.961 30.709 16.142 6.496 21.063 3.189 1.378 28.740
  WG7185 6200 601120 110119 16.732 33.465 17.717 6.496 23.622 3.189 1.378 31.496

Characteristics

RINGFEDER® TNK serie TKV

Barrel couplings made of reinforced-material for use in crane/ hoist applications to support the rope drum.

Characteristics

  • Torsionally rigid, compensate for angular and axial shaft misalignment
  • Torque transmission by hardened, barrel shaped steel rollers
  • Equipped with wear indication
  • Outer diameters up to 850 mm
  • Bores up to 425 mm
  • Torques up to TKmax = 815,000 Nm
  • Maximal radial load Frad = 490,000 N

FEATURES AND APPLICATIONS

The barrel coupling consists of a sleeve, made of reinforced-material, equipped with semi-circular internal teeth and a hub, made of reinforced-material, with semi-circular external teeth of the same shape. In the resulting circular recording hardened steel barrel rollers are used, which serve as power transmission elements. Lock rings on both sides of the barrel rollers serve for their axial guidance. Inner and outer covers, each of which is equipped with a lip seal, effectively prevent foreign matter from entering and lubricant from escaping.

Due to the curved shape of the barrel rollers, it is possible to swing the hub relative to the housing, as a result of which angular alignment errors can be compensated. Depending on the size of the coupling, axial displacements of 3 mm to 8 mm can be accommodated during operation. The torque is transmitted by means of two carrier face on the housing and their counter-carrier face into the drum. The screws, used to connect the drum, support torque transmission.

By using high-strength materials for hub and sleeve, the transmission capability compared to the type TK could be significantly increased.

Barrel couplings are used in material handling technology and especially in crane hoists to connect rope drums to the gear output shaft with minimum axial space. In this application, the barrel coupling transmits high torques and large radial forces and yet acts as a joint. Thus, in a rigid connection of the gear shaft with a lifting drum a three-point bearing (Figure No. 1) and thus a statically indeterminate case would result.

Then a high alignment quality is required. However, unavoidable assembly inaccuracies, deflection of the foundation under load, and wear on the bearing cause enormous additional forces has to be absorbed by the stored gear shaft. Alternating bending stress can cause fatigue failure and bearing and gear damage.

In order to avoid this risk, barrel couplings between the gearbox and the rope drum are positioned, which, due to their characteristics, compensate angular misalignments. With the barrel coupling in a three-point bearings, a statically indeterminate becomes a statically determined drive train, whereby high bending moments and constraining forces are avoided. Figure 3 shows the assembly of a barrel coupling in a hoist. Taking into account that the coupling absorbs displacements and thus acts as a floating bearing, a spherical roller bearing is to be provided as a fixed bearing at the other end of the drum shaft.
Barrel Coupling

In the recommended mounting Fig. 2, the barrel coupling, which is installed between the gearbox and rope drum, performs the function of an articulated joint, thus making the connection statically determinate and avoiding the occurrence of high bending moments.

 

Downloads

Product Paper Barrel Couplings RINGFEDER® TNK

Product Paper Barrel Couplings RINGFEDER® TNK

Tech Paper Barrel Couplings RINGFEDER® TNK TKV

Tech Paper Barrel Couplings RINGFEDER® TNK TKV

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