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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 118WCB

Dimension D24

 N/A 0.93 in24 mm

Dimension D25

 N/A 1.47 in37 mm

Dimension D29

 N/A 0.250 in6.4 mm

Dimension D46

 N/A 1.25 in32 mm

Dimension D43

 N/A 3.14 in80 mm
Dimension G1 N/A 23.25 in590.6 mm

Number of Bolt Holes H3

 N/A 12

Bolt Hole Size H3

 N/A 3/4-10
Bolt Circle Diameter H32 N/A 21.750 in552.4 mm

Dimension H10

 N/A 11.00 in279 mm
Dimension H133 N/A 18.250 in463.5 mm

Dimension J1

 N/A 8.50 in216 mm
Dimension J24 N/A 23.86 in606 mm

Number H4

 N/A 6

Size H4

 N/A 3/8-16 in3/8-16 mm

Bolt Circle H4

 N/A 9.125 in231.8 mm

Single Piston Size

 N/A 1/2-14

Piston Inlet Bolt Circle Diameter

 N/A 15.25 in387 mm

Minimum Bore Size

 N/A 2.88 in73 mm

Maximum Bore Size

 N/A 5.56 in141 mm

Dimension D

 N/A 9.00 in229 mm

Dimension D1

 N/A 2.50 in64 mm

Dimension D2

 N/A 7.32 in186 mm
Number of Coolant Ports (O)5 N/A 4
Coolant Port Thread Size6 N/A 1/2-14 NTP

Gear Part Number

 N/A 302813
Dynamic Torque Rating7 N/A 48800 lb-in @ 80 psi 5514 Nm @ 5.5 bar
Thermal Rating8 N/A 120 hp89.5 kW
Water Flow9 N/A 12 gpm45.4 dm³/min
Maximum Slip Speed10 N/A 955 rpm
Maximum Freewheeling Speed11 N/A 1600

Housing (Weight)

 N/A 284 lb129 kg

Disc & Gear (Weight)

 N/A 41 91

Disc & Gear (Inertia)

 N/A 0.84 20

Housing (Inertia)

 N/A 170 lb·ft²7.16 kg·m²

Water Volume

 N/A 65 in³1.1 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).