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All Categories > Clutches and Brakes > Tension Brakes > Airflex® Water Cooled Brakes > WCBD Disc Brake Elements > Item # 146534  
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Item # 146534, 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
136WCBEP

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 in
1 3/8-6 mm

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

Large Piston Inlet Thread Size O2
3/4-14 in
3/4-14 mm

Large Piston Inlet Bolt Circle Diameter
28.000 in
711 mm

Small Piston Inlet Thread Size O2
3/8-18 in
3/8-18 mm

Small Piston Inlet Bolt Circle Diameter
22.250 in
565 mm

Minimum Bore Size
5.63 in
143 mm

Maximum Bore Size
11.250 in
286 mm

Dimension D
17.00 in
432 mm

Dimension D1
5.00 in
127 mm

Dimension D2
12.18 in
309 mm

Number of Coolant Ports (O)5
4

Coolant Port Thread Size6
1 1/4 SAE ORB

Gear Part Number
416538

Dynamic Torque Rating7
295000 lb-in @ 80 psi
33331 Nm @ 5.5 bar

Dynamic Torque Rating - Large Piston Only
25196 Nm @ 5.5 bar

Dynamic Torque Rating - Small Piston Only
8022 Nm @ 5.5 bar

Thermal Rating8
780 hp
581.6 kW

Water Flow9
78 gpm
295.3 dm³/min

Maximum Slip Speed10
475 rpm

Maximum Freewheeling Speed11
700

Housing (Weight)
2650 lb
1202 kg

Disc & Gear (Weight)
213
470

Housing (Inertia)
4922 lb·ft²
207.41 kg·m²

Disc & Gear (Inertia)
13.65
324

Water Volume
600 in³
9.9 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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