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All Categories > Clutches and Brakes > Tension Brakes > Airflex® Water Cooled Brakes > WCB2 Disc Brake Elements > Item # 146475  
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Item # 146475, WCB2 Single Piston


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: Imperial Metric Both

Specifications  · Where Used  · Features  · Note

Specifications

Size
348WCB

Dimension D24
1.48 in
38 mm

Dimension D25
2.70 in
69 mm

Dimension D43
5.80 in
147 mm

Dimension G1
56.50 in
1435.0 mm

Number of Bolt Holes H3
16

Bolt Hole Size H3
1 3/8-6

Bolt Circle Diameter H32
58.688 in
1490.7 mm

Dimension H10
25.19 in
640 mm

Dimension J1
23.00 in
584 mm

Dimension J23
57.09 in
1450 mm

Number H4
3

Size H4
3/4-10 in
3/4-10 mm

Bolt Circle H4
24.500 in
622.3 mm

Single Piston Size
1-11.5

Piston Inlet Bolt Circle Diameter
41.500 in
1054.1 mm

Minimum Bore Size
10.250 in
260 mm

Maximum Bore Size
16.81 in
427 mm

Dimension D
30.70 in
780 mm

Dimension D1
16.75 in
425 mm

Dimension D2
25.71 in
653 mm

Number of Coolant Ports (O)4
12

Coolant Port Thread Size5
1 1/4 SAE ORB

Gear Part Number
416688

Dynamic Torque Rating6
2058000 lb-in @ 80 psi
232523 Nm @ 5.5 bar

Thermal Rating7
3900 hp
2908 kW

Water Flow8
390 gpm
14763 dm³/min

Maximum Slip Speed9
360 rpm

Maximum Freewheeling Speed10
600

Housing (Weight)
6378 lb
2893 kg

Disc & Gear (Weight)
1081
2383

Disc & Gear (Inertia)
186.85
4434

Housing (Inertia)
20398 lb·ft²
859.59 kg·m²

Water Volume
2100 in³
34.4 dm³

Manufacturer
Eaton-Airflex

Actuation
Air Applied
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 Maximum diameter of "as cast" surfaces
4 American National Pipe Thread
5 American National Pipe Thread
6 Exact torque rating is dependent upon applied pressure. Maximum allowable pressure is 150 psi (10.3 bar).
7 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.
8 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
9 Based upon a continuous slip velocity of 4500 fpm (22.9 mps).
10 Maximum freewheeling velocity is 7500 fpm (38.1 mps).


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


Features
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
1.96 in (50 mm) for 148WCB
1.75 in (44 mm) for 248WCB
1.75 in (44 mm) for 348WCB
1.75 in (44 mm) for 448WCB
Basic part number only. Order gear separately.


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WCB2/WBCD Disc Brake Elements Component Parts
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