Contact us today:800.925.8824 Email
REQUEST FOR QUOTE
Search Catalog
        
 All Categories    WCBD Disc Brake Elements
All Categories > Clutches and Brakes > Tension Brakes > Airflex® Water Cooled Brakes > WCBD Disc Brake Elements > Item # 146425  
Download PDF Download PDF     Printable Page     Email Email This Page     Save To Favorites Save To Favorites

Item # 146425, 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
124WCB

Dimension D24
1.06 in
27 mm

Dimension D25
1.75 in
44 mm

Dimension D29
0.250 in
6.4 mm

Dimension D46
1.38 in
35 mm

Dimension D43
4.13 in
105 mm

Dimension G1
29.998 in
761.9 mm

Number of Bolt Holes H3
12

Bolt Hole Size H3
1 1/8-7 in
1 1/8-7 mm

Bolt Circle Diameter H32
27.875 in
708.0 mm

Dimension H10
12.75 in
324 mm

Dimension H133
24.375 in
619.1 mm

Dimension J1
11.50 in
292 mm

Dimension J24
30.62 in
778 mm

Number H4
6

Size H4
3/8-16 in
3/8-16 mm

Bolt Circle H4
12.250 in
311.2 mm

Large Piston Inlet Thread Size O2
1/2-14 in
1/2-14 mm

Large Piston Inlet Bolt Circle Diameter
20.500 in
521 mm

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

Small Piston Inlet Bolt Circle Diameter
14.500 in
368 mm

Minimum Bore Size
3.75 in
95 mm

Maximum Bore Size
7.25 in
184 mm

Dimension D
11.00 in
279 mm

Dimension D1
3.50 in
89 mm

Dimension D2
9.26 in
235 mm

Number of Coolant Ports (O)5
4

Coolant Port Thread Size6
3/4 SAE ORB

Gear Part Number
411672

Dynamic Torque Rating7
100000 lb-in @ 80 psi
11298 Nm @ 5.5 bar

Dynamic Torque Rating - Large Piston Only
8135 Nm @ 5.5 bar

Dynamic Torque Rating - Small Piston Only
3051 Nm @ 5.5 bar

Thermal Rating8
270 hp
201.3 kW

Water Flow9
27 gpm
102.2 dm³/min

Maximum Slip Speed10
715 rpm

Maximum Freewheeling Speed11
1200

Housing (Weight)
445 lb
202 kg

Disc & Gear (Weight)
208
94

Housing (Inertia)
622 lb·ft²
26.21 kg·m²

Disc & Gear (Inertia)
3.29
78

Water Volume
160 in³
2.6 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.


 MORE IMAGES 

·  WCB2 Disc Brake Elements Mounting Circles


 DOWNLOADS 

WCB2/WBCD Disc Brake Elements Component Parts
(PDF, 213KB)


Site created by Thomas Web Solutions© 2014, The Rowland Company