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146428

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

424WCB

Dimenson D24

1.06 in
27 mm

Dimenson D25

1.75 in
44 mm

Dimenson D29

0.250 in
6.4 mm

Dimenson D46

1.38 in
35 mm

Dimenson D43

4.13 in
105 mm

Dimenson G1

29.998 in
761.9 mm

Number of Bolt Holes H3

12

Bolt Hole Size H3

1 1/8-7 in
1 1/8-7 mm

Bolt Circle Diameter H32

27.875 in
708.0 mm

Dimension H10

12.75 in
324 mm

Dimension H133

24.375 in
619.1 mm

Dimension J1

11.50 in
292 mm

Dimension J24

30.62 in
778 mm

Number H4

6

Size H4

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

Bolt Circle H4

12.250 in
311.2 mm

Small Piston Inlet Thread Size O2

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

Large Piston Inlet Bolt Circle Diameter

20.500 in
521 mm

Small Piston Inlet Thread Size O2

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

Small Piston Inlet Bolt Circle Diameter

14.500 in
368 mm

Minimum Bore Size

6.00 in
152 mm

Maximum Bore Size

9.38 in
238 mm

Dimension D1

28.50 in
724 mm

Dimension D2

21.43 in
544 mm

Number of Coolant Ports O5

16

Coolant Port Thread Size6

3/4 SAE ORB

Gear Part Number

413195

Dynamic Torque Rating7

400000 lb-in @ 80 psi
45194 Nm @ 5.5 bar

Dynamic Torque Rating – Large Piston Only

32766 Nm @ 5.5 bar

Dynamic Torque Rating – Small Piston Only

12315 Nm @ 5.5 bar

Thermal Rating8

1080 hp
805 kW

Water Flow9

108 gpm
409 dm³/min

Maximum Slip Speed10

715 rpm

Maximum Free Wheeling Speed11

1200

Housing Weight

1180 lb
534 kg

Disc Gear Weight

347767

Housing Inertia

1222 lb·ft²
51.5 kg·m²

Disc Gear Inertia

13.4318

Water Volume

640 in³
10.5 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).