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All Categories > Clutches and Brakes > Tension Brakes > Airflex® Water Cooled Brakes > WCB2 Disc Brake Elements > Item # 146458  
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Item # 146458, 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

114WCB

Dimension D24

0.91 in
23
mm

Dimension D25

1.41 in
36
mm

Dimension D29

0.250 in
6.4
mm

Dimension D43

2.90 in
74
mm

Dimension G1

18.750 in
476.3
mm

Number of Bolt Holes H3

8

Bolt Hole Size H3

3/4-10

Bolt Circle Diameter H32

17.000 in
431.8
mm

Dimension H10

7.12 in
181
mm

Dimension H133

14.375 in
365.1
mm

Dimension J1

6.00 in
152
mm

Dimension J24

18.94 in
481
mm

Number H4

3

Size H4

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

Bolt Circle H4

6.500 in
165.1
mm

Single Piston Size

1/2-14

Piston Inlet Bolt Circle Diameter

11.5 in
292
mm

Minimum Bore Size

2.25 in
57
mm

Maximum Bore Size

4.50 in
114
mm

Dimension D

8.00 in
203
mm

Dimension D1

2.88 in
73
mm

Dimension D2

6.59 in
167
mm

Number of Coolant Ports (O)5

4

Coolant Port Thread Size6

1/2-14 NTP

Gear Part Number

415454

Dynamic Torque Rating7

21500 lb-in @ 80 psi
2429 Nm @ 5.5 bar

Thermal Rating8

60 hp
44.7
kW

Water Flow9

6 gpm
22.7
dm³/min

Maximum Slip Speed10

1260 rpm

Maximum Freewheeling Speed11

2100

Housing (Weight)

217 lb
98
kg

Disc & Gear (Weight)

48
22

Disc & Gear (Inertia)

0.27
6.4

Housing (Inertia)

64 lb·ft²
2.7
kg·m²

Water Volume

40 in³
0.7
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
1.06 in (27 mm) for 114WCB & 314WCB
Basic part number only. Order gear separately.



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