146434

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	348WCB
Dimenson D₂₄	1.48 in 38 mm
Dimenson D₂₅	2.70 in 69 mm
Dimenson D₂₉	5.80 in 147 mm
Dimenson D₄₆	N/A
Dimenson D₄₃	N/A
Dimenson G¹	56.50 in 1435.0 mm
Number of Bolt Holes H₃	16
Bolt Hole Size H₃	1 3/8-6 in 1 3/8-6 mm
Bolt Circle Diameter H₃²	58.688 in 1490.7 mm
Dimension H₁₀	25.19 in 640 mm
Dimension H₁₃³	N/A
Dimension J₁	23.00 in 584 mm
Dimension J₂⁴	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
Small Piston Inlet Thread Size O₂	1-11.5 in 1-11.5 mm
Large Piston Inlet Bolt Circle Diameter	41.500 in 1054.1 mm
Small Piston Inlet Thread Size O₂	0.5-14 in 0.5-14 mm
Small Piston Inlet Bolt Circle Diameter	31.5 in 800 mm
Minimum Bore Size	10.250 in 260 mm
Maximum Bore Size	16.81 in 427 mm
Dimension D₁	30.70 in 780 mm
Dimension D₂	25.71 in 653 mm
Number of Coolant Ports O⁵	12
Coolant Port Thread Size⁶	1 1/4 SAE ORB
Gear Part Number	416688
Dynamic Torque Rating⁷	2058000 lb-in @ 80 psi 232523 Nm @ 5.5 bar
Dynamic Torque Rating – Large Piston Only	1524000 lb-in @ 80 psi 172189 Nm @ 5.5 bar
Dynamic Torque Rating – Small Piston Only	60334 Nm @ 5.5 bar
Thermal Rating⁸	3900 hp 2908 kW
Water Flow⁹	390 gpm 14763 dm³/min
Maximum Slip Speed¹⁰	360 rpm
Maximum Free Wheeling Speed¹¹	600
Housing Weight	6378 lb 2893 kg
Disc Gear Weight	10812383
Housing Inertia	20398 lb·ft² 859.59 kg·m²
Disc Gear Inertia	186.854434
Water Volume	2100 in³ 34.4 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).