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146318

WCS Disc Brake Elements

Element construction and operation is illustrated in the figure. Pressurizing the unit compresses the brake springs and withdraws the water jackets from the brake discs. Heat generated at the friction interfaces 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 224WCS has two friction discs 24 inches in diameter.

Specifications

Size

218WCS

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

23.250 in
590.6 mm

Dimension H10

11.00 in
279 mm

Dimension H13

18.250 in
463.5 mm

Dimension J1

8.50 in
216 mm

Dimension J2

23.69 in
602 mm

Inlet Port Thread Size O22

1/2/2014

Inlet Bolt Circle Diameter

15.25 in
387 mm

Minimum Bore Range3

3.38 in
86 mm

Maximum Bore Range4

5.88 in
149 mm

Dimension D1

5.63 in
143 mm

Dimension D

13.33 in
339 mm

Dimension D2

12.55 in
319 mm

Number of Coolant Ports O5

6

Coolant Port Thread Size

1/2-14 NPT

Gear Port Number

302907

Torque Rating

76000 lb·in
8580 Nm

Release Pressure

80 psi
5.5 bar

Thermal Rating6

240 hp
179 kW

Water Flow Rate7

24 gpm
90.9 dm³/min

Housing Inertia

220 lb·ft²
9.27 kg·m²

Disc Gear Weight

179395

Disc Gear Inertia

2.6203966

Maximum Slip Speed8

955 rpm

Maximum Free Wheeling Speed9

1600

Housing Weight

548 lb
167 kg

Water Volume

1252.05

Manufacturer

Eaton-Airflex

Actuation

Spring Applied, Air Release

Where Used

Logging Equipment
Marine Mooring Systems
Drilling rigs

Features

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.

1 Tolerance Sizes 8WCS thru 24 WCS +0.000/0.003 (+0.00/-0.08) 36WCS +0.000/-0.005 (+0.00/-0.13)
2 American National Pipe Thread.
3 Maximum bore sizes are based on flat keys, allow able gear hub stresses and torque ratings with a full complement of springs.
4 Maximum bore sizes are based on flat keys, allow able gear hub stresses and torque ratings with a full complement of springs.
5 American National Pipe Thread.
6 Based upon a 70 ºF (21 ºC) fresh water inlet temperature and a 50 ºF (28 ºC) temperature rise between inlet and outlet. See cooling requirements.
7 To insure proper cooling, inlet port must be located at the six o’clock position. Maximum allowable inlet pressure is 45 psi (3.1 bar).
8 Based upon a continuous slip velocity of 4500 fpm (22.9 mps).
9 Maximum freewheeling velocity is 7500 fpm (38.1 mps)