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146424

WCBD Disc Brake Elements

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.

Specifications

Size

418WCB

Dimenson D24

0.93 in
24 mm

Dimenson D25

1.47 in
37 mm

Dimenson D29

0.250 in
6.4 mm

Dimenson D46

1.25 in
32 mm

Dimenson D43

3.14 in
80 mm

Dimenson G1

23.25 in
590.6 mm

Number of Bolt Holes H3

12

Bolt Hole Size H3

3/4-10 in
3/4-10 mm

Bolt Circle Diameter H32

21.750 in
552.4 mm

Dimension H10

11.00 in
279 mm

Dimension H133

18.250 in
463.5 mm

Dimension J1

8.50 in
216 mm

Dimension J24

23.86 in
606 mm

Number H4

6

Size H4

3/8-16 in
3/8-16 mm

Bolt Circle H4

9.125 in
231.8 mm

Small Piston Inlet Thread Size O2

1/2-14 in
1/2-14 mm

Large Piston Inlet Bolt Circle Diameter

15.75 in
400 mm

Small Piston Inlet Thread Size O2

3/8-18 in
3/8-18 mm

Small Piston Inlet Bolt Circle Diameter

11.630 in
295 mm

Minimum Bore Size

4.63 in
117 mm

Maximum Bore Size

6.13 in
156 mm

Dimension D1

21.50 in
546 mm

Dimension D2

17.34 in
440 mm

Number of Coolant Ports O5

16

Coolant Port Thread Size6

1/2-14 NTP

Gear Part Number

414111

Dynamic Torque Rating7

195200 lb-in @ 80 psi
22055 Nm @ 5.5 bar

Dynamic Torque Rating – Large Piston Only

16473 Nm @ 5.5 bar

Dynamic Torque Rating – Small Piston Only

5570 Nm @ 5.5 bar

Thermal Rating8

480 hp
358 kW

Water Flow9

48 gpm
182 dm³/min

Maximum Slip Speed10

955 rpm

Maximum Free Wheeling Speed11

1600

Housing Weight

665 lb
302 kg

Disc Gear Weight

174383

Housing Inertia

320 lb·ft²
13.48 kg·m²

Disc Gear Inertia

3.378

Water Volume

245 in³
4.0 dm³

Manufacturer

Eaton-Airflex

Actuation

Air Applied

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

Notes

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.
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).