The Rowland Company
The Rowland Company
4900 North 20th St.
Philadelphia, PA 19144
Toll Free: (800) 925-8824
Phone: (215) 455-4900
Fax: (215) 455-8888
Email: rowland@rowland2.com
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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 308WCB

Dimension D24

 N/A 0.81 in21 mm

Dimension D25

 N/A 1.25 in32 mm

Dimension D29

 N/A 0.250 in6.4 mm

Dimension D43

 N/A 2.62 in67 mm
Dimension G1 N/A 12.125 in308.0 mm

Number of Bolt Holes H3

 N/A 8

Bolt Hole Size H3

 N/A 1/2-13 in1/2-13 mm
Bolt Circle Diameter H32 N/A 10.875 in276.2 mm

Dimension H10

 N/A 4.12 in106 mm
Dimension H133 N/A 8.375 in212.7 mm

Dimension J1

 N/A 3.12 in79 mm
Dimension J24 N/A 12.24 in311 mm

Number H4

 N/A 3

Size H4

 N/A 1/4-20 in1/4-20 mm

Bolt Circle H4

 N/A 3.500 in88.9 mm

Large Piston Inlet Thread Size O2

 N/A TBD inTBD mm

Large Piston Inlet Bolt Circle Diameter

 N/A TBD inTBD mm

Small Piston Inlet Thread Size O2

 N/A TBD inTBD mm

Small Piston Inlet Bolt Circle Diameter

 N/A TBD inTBD mm

Minimum Bore Size

 N/A 2.00 in51 mm

Maximum Bore Size

 N/A 2.50 in64 mm

Dimension D

 N/A 12.88 in327 mm

Dimension D1

 N/A 7.75 in196 mm

Dimension D2

 N/A 10.95 in278 mm
Number of Coolant Ports (O)5 N/A 8
Coolant Port Thread Size6 N/A 3/8-18 NTP

Gear Part Number

 N/A 416457
Dynamic Torque Rating7 N/A 17100 lb-in @ 80 psi 1932 Nm @ 5.5 bar

Dynamic Torque Rating - Large Piston Only

 N/A 1006 Nm @ 5.5 bar

Dynamic Torque Rating - Small Piston Only

 N/A 915 Nm @ 5.5 bar
Thermal Rating8 N/A 90 hp67.2 kW
Water Flow9 N/A 9 gpm34.2 dm³/min
Maximum Slip Speed10 N/A 2150 rpm
Maximum Freewheeling Speed11 N/A 3400

Housing (Weight)

 N/A 120 lb54 kg

Disc & Gear (Weight)

 N/A 27 59

Housing (Inertia)

 N/A 15 lb·ft²0.64 kg·m²

Disc & Gear (Inertia)

 N/A 0.04 2.33

Water Volume

 N/A 36 in³0.6 dm³

Manufacturer

 N/A Eaton-Airflex

Actuation

 N/A Air Applied

General Description

N/A 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.

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 1.00 in (25 mm) for 108WCB
1.38 in (35 mm) for 208WCB
0.857 in (4.8 mm) for 308WCB
Basic part number only.Order gear separately.
Some high torque applications of three or four disc elements require additional torsonial support on the cylinder end of the unit. Contact your Airflex representative for more details.

  • 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).