Fluid Couplings
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Fluid Couplings

Fluid couplings are designed to provide smooth power transmission and controlled equipment startup in industrial drive systems. During startup, power is transferred gradually through the fluid and impeller, helping prevent shock loads that can damage motors, gearboxes, conveyors, crushers, and other rotating equipment.

By adjusting the internal oil level through the oil inlet or outlet, the coupling can precisely regulate startup performance under different working conditions. This allows the system to start in a more controlled manner while reducing sudden torque impact, vibration, and mechanical stress. It also provides reliable overload protection to help improve overall system operating life.

  • Dual fusible plug protection Two fusible plugs are installed on the coupling to help protect the equipment from overheating caused by overload conditions originating from the driven machine or motor system.
  • Optional proximity sensor system An optional proximity sensor can help prevent fluid leakage and allows the safety switch to be reset during frequent overload situations.
  • Optional thermal trip protection An optional replaceable thermal trip breaker connected to a switch system can automatically stop fluid leakage under excessive temperature conditions.
Applications

Suitable for a wide range of industrial drive systems, including belt conveyors, scraper conveyors, bucket elevators, ball mills, winches, crushers, excavators, mixers, straightening machines, cranes, and other heavy-duty industrial machinery

Selection guide

Under standard operating conditions and without special requirements, the fluid coupling model can be selected according to the motor speed (input speed of the coupling) and required transmission power based on the model selection table. The coupling uses oil as the transmission medium.

Torque-Limiting Fluid Coupling (Oil Medium)
Model 600r/m 7200r/m 9700r/m 14500r/m 17500r/m
Transmitted Power (HP)
YOX360 2.5~5 6~12 20~40 35~70
YOX380 3~7 8~16 25~50 45~90
YOX400 5~10 12~25 30~65 55~120
YOX420 6~12 13~26 40~80 70~140
YOX450 9~18 20~40 60~120 110~220
YOX500 15~30 35~65 90~200 150~325
YOX510 16~32 36~72 100~205 170~340
YOX562 25~50 60~120 180~360 300~600
YOX600 35~65 80~150 240~480 350~700
TVA650 50~100 120~240 320~640 450~900
TVA750 48~100 90~190 220~440 500~1000 800~1000
TVA866 90~190 180~360 410~825 1020~1450
YOX1000 190~400 360~800 825~1450
YOX1150 400~825 780~1600
YOX1250 600~1250 1200~2450
YOX1320 800~1600 1450~3200
YOX1550 1600~3450
YOX series torque-limiting fluid coupling (standard edition) data table notes
YOX series torque-limiting fluid coupling (standard edition) data table notes
  • When H1 or H2 exceeds the listed maximum values (H1MAX / H2MAX), the corresponding L dimension can be increased accordingly.
  • The set screw inside the shaft bore shown in the drawing is an optional component.
Model Lmin D Input Bore Output Bore Oil Filling (gal) Weight w/o Oil (lb) Max. Speed (r/min) Overload Ratio
D1max H1max D2max H2max Max. Min.
YOX360 12.20 Ø 16.54 Ø 2.17 4.33 Ø 2.17 4.33 1.87 0.94 108 1450 2~2.5
YOX380 12.60 Ø 17.72 Ø 2.36 5.51 Ø 2.36 5.51 2.22 1.11 128 1450 2~2.5
YOX400 14.02 Ø 18.90 Ø 2.36 5.51 Ø 2.36 5.91 2.46 1.23 143 1450 2~2.5
YOX420 14.49 Ø 19.49 Ø 2.36 5.51 Ø 2.36 6.30 3.17 1.58 154 1450 2~2.5
YOX450 15.63 Ø 20.87 Ø 2.95 5.51 Ø 2.76 5.51 3.43 1.72 154 1450 2~2.5
YOX500 16.18 Ø 23.23 Ø 3.35 6.69 Ø 3.35 5.71 5.07 2.53 231 1450 2~2.5
YOX510 16.77 Ø 23.23 Ø 3.35 6.69 Ø 3.35 7.28 5.02 2.51 262 1450 2~2.5
YOX562 17.68 Ø 24.96 Ø 3.94 6.69 Ø 4.33 6.69 7.92 3.96 288 1450 2~2.5
YOX600 18.66 Ø 27.36 Ø 3.54 6.69 Ø 3.94 7.09 9.50 4.75 352 1450 2~2.5
TVA650 21.10 Ø 29.13 Ø 4.92 8.86 Ø 5.12 7.87 12.14 6.07 482 1450 2~2.5
TVA750 24.37 Ø 33.15 Ø 5.51 9.84 Ø 5.91 9.84 17.95 8.98 730 1450 2~2.5
TVA866 27.72 Ø 38.50 Ø 6.30 11.02 Ø 6.30 10.43 29.30 14.65 1034 1450 2~2.5
YOX1000 29.29 Ø 44.29 Ø 6.30 9.84 Ø 6.30 11.02 38.02 19.01 1320 970 2~2.5
YOX1150 33.46 Ø 50.98 Ø 7.09 11.81 Ø 7.09 11.81 58.08 29.04 2002 720 2~2.5
YOX1250 35.43 Ø 55.35 Ø 7.87 13.78 Ø 7.87 13.78 71.28 35.64 2565 720 2~2.5
YOX1320 37.52 Ø 58.46 Ø 7.87 13.78 Ø 7.87 13.78 86.59 43.30 3168 720 2~2.5
YOXE series torque-limiting fluid coupling
YOXE series torque-limiting fluid coupling
  • The YOXE series combines the standard fluid coupling structure with an elastic coupling design, making alignment, installation, and maintenance more convenient during operation and equipment servicing.
Model D E A F L1 L2min I J d1max D2max Oil Filling (gal) Weight w/o Oil (lb) Max. Speed (r/min) Overload Ratio
Max. Min.
YOXE400 Ø 18.90 0.20 12.95 0.24 1.77 2.17 Ø 7.48 Ø 5.51 Ø 2.36 Ø 2.36 2.46 1.23 132 1450 2~2.5
YOXE420 Ø 19.49 0.20 12.95 0.24 1.77 2.17 Ø 7.48 Ø 5.51 Ø 2.36 Ø 2.36 3.17 1.58 176 1450 2~2.5
YOXE450 Ø 20.87 0.24 14.65 0.24 1.77 2.17 Ø 8.66 Ø 6.69 Ø 2.76 Ø 2.76 3.43 1.72 308 1450 2~2.5
YOXE500 Ø 23.23 0.20 14.45 0.24 2.17 2.76 Ø 7.87 Ø 7.68 Ø 3.35 Ø 3.35 5.07 2.53 297 1450 2~2.5
YOXE510 Ø 23.23 0.20 15.87 0.24 2.17 2.76 Ø 10.24 Ø 7.68 Ø 3.35 Ø 3.35 5.02 2.51 352 1450 2~2.5
YOXE562 Ø 24.96 0.20 16.06 0.31 2.17 3.15 Ø 11.22 Ø 8.46 Ø 3.94 Ø 3.94 7.92 3.96 528 1450 2~2.5
YOXE600 Ø 27.36 0.24 18.27 0.39 2.76 3.74 Ø 12.99 Ø 9.65 Ø 4.33 Ø 3.94 9.50 4.75 539 1450 2~2.5
TVAE650 Ø 29.13 0.20 18.66 0.24 2.76 3.74 Ø 12.20 Ø 9.06 Ø 4.33 Ø 3.54 12.14 6.07 572 1450 2~2.5
TVAE750 Ø 33.15 0.24 21.26 0.24 3.54 4.33 Ø 14.17 Ø 10.43 Ø 4.72 Ø 4.13 17.95 8.98 880 1450 2~2.5
TVAE866 Ø 38.50 0.28 24.29 0.47 3.54 4.33 Ø 16.14 Ø 12.20 Ø 6.30 Ø 6.30 29.30 14.65 1254 970 2~2.5
YOXE1000 Ø 44.29 0.39 28.70 0.47 4.25 8.27 Ø 22.44 Ø 17.72 Ø 6.30 Ø 6.30 38.02 19.01 2618 720 2~2.5
YOXE1150 Ø 50.98 0.31 32.68 0.47 5.12 8.27 Ø 22.44 Ø 17.72 Ø 7.09 Ø 9.45 58.08 29.04 3784 720 2~2.5
YOXSQ series dual-chamber torque-limiting fluid coupling
YOXSQ series dual-chamber torque-limiting fluid coupling
  • The power transmission capacity of the YOXSQ series is twice that of the standard model with the same specification.
  • The set screw inside the shaft bore shown in the drawing is an optional component.
Model Lmin D Input Bore Output Bore Oil Filling (gal) Weight w/o Oil (lb) Max. Speed (r/min) Overload Ratio
D1max H1max D2max H2max Max. Min.
YOXSQ400 18.50 Ø18.90 Ø2.36 5.51 Ø2.36 5.91 4.75 2.38 264 1450 2~2.5
YOXSQ450 19.69 Ø20.87 Ø2.95 5.51 Ø2.76 5.91 6.60 3.30 308 1450 2~2.5
YOXSQ500 22.05 Ø23.23 Ø3.35 6.69 Ø3.35 6.69 9.50 4.75 396 1450 2~2.5
YOXSQ562 24.02 Ø25.59 Ø3.54 6.69 Ø3.94 7.09 13.20 6.60 572 1450 2~2.5
YOXSQ600 25.20 Ø27.36 Ø3.54 6.69 Ø3.94 7.09 18.48 9.24 660 1450 2~2.5
TVASQ650 27.95 Ø29.13 Ø4.72 8.86 Ø5.12 7.87 23.76 11.88 880 1450 2~2.5
TVASQ750 31.50 Ø33.15 Ø5.51 9.84 Ø5.51 8.27 33.79 16.90 1430 1450 2~2.5
YOXB series torque-limiting fluid coupling with brake wheel
YOXB series torque-limiting fluid coupling with brake wheel

The YOXB series integrates a brake wheel structure into the fluid coupling system, making it suitable for industrial drive applications requiring controlled braking and power transmission functions.
Brake wheel dimensions can be customized according to application requirements.

Model Lmin D L1 Input Bore Output Bore Brake Pulley Oil Filling (gal) Weight w/o Oil (lb) Max. Speed (r/min) Overload Ratio
d1max H1max d2max H2max D1 B Max. Min.
YOXB400 21.89 Ø18.90 0.39 Ø2.76 5.51 Ø2.76 5.51 Ø12.40 5.91 2.46 1.23 240 1450 2~2.5
YOXB450 22.83 Ø20.87 0.39 Ø2.95 5.51 Ø2.76 5.51 Ø12.40 5.91 3.43 1.72 275 1450 2~2.5
YOXB500 26.14 Ø23.23 0.39 Ø3.54 6.69 Ø3.54 6.69 Ø15.75 7.48 5.07 2.53 330 1450 2~2.5
YOXB562 28.98 Ø25.59 0.39 Ø3.94 8.27 Ø3.94 8.27 Ø15.75 7.48 7.13 3.56 442 1450 2~2.5
YOXB600 31.10 Ø27.36 0.59 Ø3.94 8.27 Ø4.33 8.27 Ø19.69 8.27 9.50 4.75 572 1450 2~2.5
TVAB650 32.64 Ø29.13 0.59 Ø4.92 8.86 Ø5.12 8.86 Ø19.69 8.27 12.14 6.07 843 1450 2~2.5
TVAB750 37.01 Ø33.15 0.59 Ø5.51 9.84 Ø5.91 9.84 Ø24.80 10.43 17.95 8.98 1052 1450 2~2.5
TVAB866 40.94 Ø38.50 0.79 Ø5.91 9.84 Ø5.91 9.84 Ø24.80 10.43 29.30 14.65 1419 1450 2~2.5
YOXB1000 44.88 Ø44.29 0.98 Ø5.91 9.84 Ø5.91 9.84 Ø27.56 11.81 38.02 19.01 1863 720 2~2.5
YOXB1150 51.18 Ø50.98 1.18 Ø6.69 13.78 Ø6.69 13.78 Ø31.50 13.39 58.08 29.04 2314 720 2~2.5
YOXY series extended rear chamber torque-limiting fluid coupling
YOXY series extended rear chamber torque-limiting fluid coupling
  • The YOXY series features an extended rear auxiliary chamber, allowing a longer oil filling time from the auxiliary chamber to the working chamber. This design helps reduce starting torque and extend startup time, making it suitable for belt conveyors and other machinery requiring smoother startup performance. It also helps reduce impact on conveyor belts and extend belt service life.
  • The set screw inside the shaft bore shown in the drawing is an optional component.
Model Lmin D Input Bore Output Bore Oil Filling (gal) Weight w/o Oil (lb) Max. Speed (r/min) Overload Ratio
D1max H1max D2max H2max Max. Min.
YOXY360 14.17 Ø16.54 Ø2.17 4.33 Ø2.17 4.33 1.87 0.94 108 1450 1.2~2.35
YOXY400 15.35 Ø18.90 Ø2.36 5.51 Ø2.36 5.91 2.46 1.23 143 1450 1.2~2.35
YOXY450 17.52 Ø20.87 Ø2.95 5.51 Ø2.76 5.51 3.43 1.72 154 1450 1.2~2.35
YOXY500 20.08 Ø23.23 Ø3.35 6.69 Ø3.35 5.71 5.07 2.53 231 1450 1.2~2.35
YOXY562 20.87 Ø24.96 Ø3.54 6.69 Ø3.94 7.09 7.13 3.56 308 1450 1.2~2.35
YOXY600 22.64 Ø27.36 Ø3.54 6.69 Ø3.94 7.09 9.50 4.75 352 1450 1.2~2.35
TVAY650 25.59 Ø29.13 Ø4.92 8.86 Ø5.12 7.87 12.14 6.07 482 1450 1.2~2.35
TVAY750 26.77 Ø33.15 Ø5.51 9.65 Ø5.91 9.45 17.95 8.98 730 1450 1.2~2.35
TVAY866 32.28 Ø38.50 Ø6.30 11.02 Ø6.30 10.43 29.30 14.65 1034 1450 1.2~2.35
YOXY1000 33.27 Ø44.29 Ø6.30 8.27 Ø6.30 11.02 38.02 19.01 1320 970 1.2~2.35
YOXY1150 37.80 Ø50.98 Ø7.09 8.66 Ø7.09 11.81 58.08 29.04 2002 720 1.2~2.35
YOXY1320 42.32 Ø58.46 Ø7.87 9.45 Ø7.87 13.78 86.59 43.30 3036 720 1.2~2.35