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WCB elements are disc type, externally cooled units. They are designed to absorb and dissipate the thermal loads associated with the most severe clutch and brake applications. The WCB friction couple was developed specifically for continuous slip service and has a dynamic coefficient of friction that is greater than its static coefficient of friction. Also available, special high coefficient linings, which provide 50% higher torque than standard friction linings and provide a 1:1 dynamic to static torque ratio. Element construction and operation is illustrated. Pressurizing the cylinder causes the piston to clamp the friction disc between the water jackets. Heat generated at the friction interface is quickly transferred to the circulating coolant. Element sizes are indicated by the number of friction discs and the disc diameter in inches. For instance, size 224WCB has two (2) friction discs 24 inches in diameter.
Unit of Measure

Specifications

Size

 N/A 436WCBEP

Dimension D24

 N/A 1.52 in39 mm

Dimension D25

 N/A 2.58 in65 mm

Dimension D29

 N/A 0.280 in7.1 mm

Dimension D46

 N/A 2.38 in60 mm

Dimension D43

 N/A 4.97 in126 mm
Dimension G1 N/A 44.498 in1130.2 mm

Number of Bolt Holes H3

 N/A 16

Bolt Hole Size H3

 N/A 1 3/8-6
Bolt Circle Diameter H32 N/A 41.500 in1054.1 mm

Dimension H10

 N/A 16.50 in419 mm
Dimension H133 N/A 18.375 in932.1 mm

Dimension J1

 N/A 16.50 in419 mm
Dimension J24 N/A 44.86 in1139 mm

Number H4

 N/A 6

Size H4

 N/A 1/2-13 in1/2-13 mm

Bolt Circle H4

 N/A 14.500 in444.5 mm

Single Piston Size

 N/A 3/4-14

Piston Inlet Bolt Circle Diameter

 N/A 28.00 in711 mm

Minimum Bore Size

 N/A 8.50 in216 mm

Maximum Bore Size

 N/A 11.75 in298 mm

Dimension D

 N/A 35.00 in889 mm

Dimension D1

 N/A 18.00 in457 mm

Dimension D2

 N/A 27.39 in696 mm
Number of Coolant Ports (O)5 N/A 16
Coolant Port Thread Size6 N/A 1 1/4 SAE ORB

Gear Part Number

 N/A 416537
Dynamic Torque Rating7 N/A 1180000 lb-in @ 80 psi 133322 Nm @ 5.5 bar
Thermal Rating8 N/A 3120 hp2326.6 kW
Water Flow9 N/A 312 gpm1181 dm³/min
Maximum Slip Speed10 N/A 475 rpm
Maximum Freewheeling Speed11 N/A 700

Housing (Weight)

 N/A 5300 lb2404 kg

Disc & Gear (Weight)

 N/A 1655 751

Disc & Gear (Inertia)

 N/A 1353 57.02

Housing (Inertia)

 N/A 9125 lb·ft²384.53 kg·m²

Water Volume

 N/A 2205 in³36.2 dm³

Manufacturer

 N/A Eaton-Airflex

Actuation

 N/A Air Applied

Where Used

N/A

  • Drilling rigs
  • Dynamometer
  • Logging equipment
  • Marine mooring systems
  • Slip clutches
  • Tension brakes
  • Unwind stands

Features

N/A Patented piston design
Single or dual piston provides wider range of applied tension with greater control.

Drop in powerhead package
Standard single piston elements can be retrofitted with a dual piston powerhead to provide increased control.

Split wear spacers
The split wear spacers allow for wear adjustment without disassembly of the brake to minimize downtime and maintenance costs.

Unique friction couple
A specially formulated friction material, interfacing with a copper alloy surface, eliminates the stick-slip characteristic associated with ordinary frictional devices.

Rapid heat dissipation
The copper interface conducts heat rapidly to the circulating coolant.

Open or closed loop coolant systems
The element works equally well with open or closed loop circulating systems. On mobile equipment, the engine’s cooling system can be tapped to provide coolant to the element.

Optional corrosion protection
For marine environment applications, protective coatings are available to minimize corrosion.

Note

N/A Basic part number only. Order gear separately.

  • 1 Tolerance Sizes 8WCB thru 24WCB
    +0.000/-0.003 (+0.00/-0.08)
    36WCB +0.000/-0.005 (+0.00/-0.13)
    48WCB +0.000/-0.005 (+0.00/-0.13)
  • 2 American National Standard for Unified Screw Threads
  • 3 Tolerance +0.003/-0.000 in.(0.08/-0.00 mm)
  • 4 Maximum diameter of "as cast" surfaces
  • 5 American National Pipe Thread
  • 6 American National Pipe Thread
  • 7 Exact torque rating is dependent upon applied pressure. Maximum allowable pressure is 150 psi (10.3 bar).
  • 8 Exact torque rating is dependent upon applied pressure. Maximum allowable pressure is 150 psi (10,3 bar).maximum allowable outlettemperatures are 150ºF (65ºC) for fresh water; 165ºF (74ºC) for 70/30 and 60/40 water glycol mixes; and 170ºF (77ºC) for 50/50 water glycol mixes.
  • 9 To insure proper cooling, inlet port must be at the six o’clock position. Flow rates shown are for fresh water, flow rates for water glycol mixes must increase to achieve the ratings in the Thermal Rating column. Maximum allowable inlet pressure - 65 psi
  • 10 Based upon a continuous slip velocity of 4500 fpm (22.9 mps).
  • 11 Maximum freewheeling velocity is 7500 fpm (38.1 mps).