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All Categories > Clutches and Brakes > Tension Brakes > Airflex® Water Cooled Brakes > WCBD Disc Brake Elements > Item # 146421  
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Item # 146421, WCBD Dual 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  · General Description  · Where Used  · Features  · Note

Specifications

Size
118WCB

Dimension D24
0.93 in
24 mm

Dimension D25
1.47 in
37 mm

Dimension D29
0.250 in
6.4 mm

Dimension D46
1.25 in
32 mm

Dimension D43
3.14 in
80 mm

Dimension 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

Large 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
2.88 in
73 mm

Maximum Bore Size
5.56 in
141 mm

Dimension D
9.00 in
229 mm

Dimension D1
2.50 in
64 mm

Dimension D2
7.32 in
186 mm

Number of Coolant Ports (O)5
4

Coolant Port Thread Size6
1/2-14 NTP

Gear Part Number
302813

Dynamic Torque Rating7
48800 lb-in @ 80 psi
5514 Nm @ 5.5 bar

Dynamic Torque Rating - Large Piston Only
4113 Nm @ 5.5 bar

Dynamic Torque Rating - Small Piston Only
1390 Nm @ 5.5 bar

Thermal Rating8
120 hp
89.5 kW

Water Flow9
12 gpm
45.4 dm³/min

Maximum Slip Speed10
955 rpm

Maximum Freewheeling Speed11
1600

Housing (Weight)
284 lb
129 kg

Disc & Gear (Weight)
41
91

Housing (Inertia)
170 lb·ft²
7.16 kg·m²

Disc & Gear (Inertia)
0.84
20

Water Volume
65 in³
1.1 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).


General Description
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.


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.
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.


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WCB2/WBCD Disc Brake Elements Component Parts
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