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All Categories > Clutches and Brakes > Tension Brakes > Airflex® Water Cooled Brakes > WCB2 Disc Brake Elements > Item # 146540  
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Item # 146540, 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

336WCBEP

Dimension D24

1.52 in
39
mm

Dimension D25

2.58 in
65
mm

Dimension D29

0.280 in
7.1
mm

Dimension D46

2.38 in
60
mm

Dimension D43

4.97 in
126
mm

Dimension G1

44.498 in
1130.2
mm

Number of Bolt Holes H3

16

Bolt Hole Size H3

1 3/8-6

Bolt Circle Diameter H32

41.500 in
1054.1
mm

Dimension H10

16.50 in
419
mm

Dimension H133

18.375 in
932.1
mm

Dimension J1

16.50 in
419
mm

Dimension J24

44.86 in
1139
mm

Number H4

6

Size H4

1/2-13 in
1/2-13
mm

Bolt Circle H4

14.500 in
444.5
mm

Single Piston Size

3/4-14

Piston Inlet Bolt Circle Diameter

28.00 in
711
mm

Minimum Bore Size

7.750 in
197
mm

Maximum Bore Size

11.75 in
298
mm

Dimension D

27.48 in
698
mm

Dimension D1

13.00 in
330
mm

Dimension D2

22.30 in
566
mm

Number of Coolant Ports (O)5

12

Coolant Port Thread Size6

1 1/4 SAE ORB

Gear Part Number

416535

Dynamic Torque Rating7

885000 lb-in @ 80 psi
99992 Nm @ 5.5 bar

Thermal Rating8

2340 hp
1744.9
kW

Water Flow9

234 gpm
885.8
dm³/min

Maximum Slip Speed10

475 rpm

Maximum Freewheeling Speed11

700

Housing (Weight)

4350 lb
1973
kg

Disc & Gear (Weight)

1240
562

Disc & Gear (Inertia)

42.56
1010

Housing (Inertia)

7724 lb·ft²
325.49
kg·m²

Water Volume

1670 in³
27.4
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 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).


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
Basic part number only. Order gear separately.



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