The Rowland Company - WCBD Disc Brake Elements

Products Catalog

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.

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Unit of Measure

Items	146415 WCBD Dual Piston	146416 WCBD Dual Piston	146417 WCBD Dual Piston	146418 WCBD Dual Piston	146419 WCBD Dual Piston
Size	N/A 108WCB	N/A 208WCB	N/A 308WCB	N/A 114WCB	N/A 214WCB
Dimension D₂₄	N/A 0.81 in21 mm	N/A 0.81 in21 mm	N/A 0.81 in21 mm	N/A 0.91 in23 mm	N/A 0.91 in23 mm
Dimension D₂₅	N/A 1.25 in32 mm	N/A 1.25 in32 mm	N/A 1.25 in32 mm	N/A 1.41 in36 mm	N/A 1.41 in36 mm
Dimension D₂₉	N/A 0.250 in6.4 mm
Dimension D₄₆	N/A
Dimension D₄₃	N/A 2.62 in67 mm	N/A 2.62 in67 mm	N/A 2.62 in67 mm	N/A 2.90 in74 mm	N/A 2.90 in74 mm
Dimension G¹	N/A 12.125 in308.0 mm	N/A 12.125 in308.0 mm	N/A 12.125 in308.0 mm	N/A 18.750 in476.3 mm	N/A 18.750 in476.3 mm
Number of Bolt Holes H₃	N/A 8
Bolt Hole Size H₃	N/A 1/2-13 in1/2-13 mm	N/A 1/2-13 in1/2-13 mm	N/A 1/2-13 in1/2-13 mm	N/A 3/4-10 in3/4-10 mm	N/A 3/4-10 in3/4-10 mm
Bolt Circle Diameter H₃²	N/A 10.875 in276.2 mm	N/A 10.875 in276.2 mm	N/A 10.875 in276.2 mm	N/A 17.000 in431.8 mm	N/A 17.000 in431.8 mm
Dimension H₁₀	N/A 4.12 in106 mm	N/A 4.12 in106 mm	N/A 4.12 in106 mm	N/A 7.12 in181 mm	N/A 7.12 in181 mm
Dimension H₁₃³	N/A 8.375 in212.7 mm	N/A 8.375 in212.7 mm	N/A 8.375 in212.7 mm	N/A 14.375 in365.1 mm	N/A 14.375 in365.1 mm
Dimension J₁	N/A 3.12 in79 mm	N/A 3.12 in79 mm	N/A 3.12 in79 mm	N/A 6.00 in152 mm	N/A 6.00 in152 mm
Dimension J₂⁴	N/A 12.24 in311 mm	N/A 12.24 in311 mm	N/A 12.24 in311 mm	N/A 18.94 in481 mm	N/A 18.94 in481 mm
Number H₄	N/A 3
Size H₄	N/A 1/4-20 in1/4-20 mm	N/A 1/4-20 in1/4-20 mm	N/A 1/4-20 in1/4-20 mm	N/A 3/8-16 in3/8-16 mm	N/A 3/8-16 in3/8-16 mm
Bolt Circle H₄	N/A 3.500 in88.9 mm	N/A 3.500 in88.9 mm	N/A 3.500 in88.9 mm	N/A 6.500 in165.1 mm	N/A 6.500 in165.1 mm
Single Piston Size	N/A 3/8-18	N/A 3/8-18	N/A 3/8-18	N/A 1/2-14	N/A 1/2-14
Bolt Circle O₂⁵	N/A 6.63 in168 mm	N/A 6.63 in168 mm	N/A 6.63 in168 mm	N/A 11.5 in292 mm	N/A 11.5 in292 mm
Large Piston Inlet Thread Size O₂	N/A TBD inTBD mm	N/A TBD inTBD mm	N/A TBD inTBD mm	N/A 1/2-14 in1/2-14 mm	N/A 1/2-14 in1/2-14 mm
Large Piston Inlet Bolt Circle Diameter	N/A TBD inTBD mm	N/A TBD inTBD mm	N/A TBD inTBD mm	N/A 13.25 in337 mm	N/A 13.25 in337 mm
Small Piston Inlet Thread Size O₂	N/A TBD inTBD mm	N/A TBD inTBD mm	N/A TBD inTBD mm	N/A 3/8-18 in3/8-18 mm	N/A 3/8-18 in3/8-18 mm
Small Piston Inlet Bolt Circle Diameter	N/A TBD inTBD mm	N/A TBD inTBD mm	N/A TBD inTBD mm	N/A 8.250 in210 mm	N/A 8.250 in210 mm
Minimum Bore Size	N/A 1.50 in38 mm	N/A 1.75 in44 mm	N/A 2.00 in51 mm	N/A 2.25 in57 mm	N/A 2.75 in70 mm
Maximum Bore Size	N/A 2.56 in65 mm	N/A 2.63 in67 mm	N/A 2.50 in64 mm	N/A 4.50 in114 mm	N/A 4.38 in111 mm
Dimension D	N/A 7.000 in178 mm	N/A 9.75 in248 mm	N/A 12.88 in327 mm	N/A 8.00 in203 mm	N/A 11.50 in292 mm
Dimension D₁	N/A 1.75 in44 mm	N/A 4.00 in102 mm	N/A 7.75 in196 mm	N/A 2.88 in73 mm	N/A 4.38 in111 mm
Dimension D₂	N/A 5.69 in145 mm	N/A 8.31 in211 mm	N/A 10.95 in278 mm	N/A 6.59 in167 mm	N/A 9.50 in241 mm
Number of Coolant Ports (O)⁶	N/A 4	N/A 6	N/A 8	N/A 4	N/A 6
Coolant Port Thread Size⁷	N/A 3/8-18 NTP	N/A 3/8-18 NTP	N/A 3/8-18 NTP	N/A 1/2-14 NTP	N/A 1/2-14 NTP
Gear Part Number	N/A 415313	N/A 415314	N/A 416457	N/A 415454	N/A 415302
Dynamic Torque Rating⁸	N/A 5700 lb-in @ 80 psi 644 Nm @ 5.5 bar	N/A 11400 lb-in @ 80 psi 1288 Nm @ 5.5 bar	N/A 17100 lb-in @ 80 psi 1932 Nm @ 5.5 bar	N/A 21500 lb-in @ 80 psi 2429 Nm @ 5.5 bar	N/A 43000 lb-in @ 80 psi 4858 Nm @ 5.5 bar
Dynamic Torque Rating - Large Piston Only	N/A 328 Nm @ 5.5 bar	N/A 667 Nm @ 5.5 bar	N/A 1006 Nm @ 5.5 bar	N/A 1808 Nm @ 5.5 bar	N/A 3627 Nm @ 5.5 bar
Dynamic Torque Rating - Small Piston Only	N/A 305 Nm @ 5.5 bar	N/A 610 Nm @ 5.5 bar	N/A 915 Nm @ 5.5 bar	N/A 610 Nm @ 5.5 bar	N/A 1220 Nm @ 5.5 bar
Thermal Rating⁹	N/A 30 hp22.4 kW	N/A 60 hp44.7 kW	N/A 90 hp67.2 kW	N/A 60 hp44.7 kW	N/A 120 hp89.5 kW
Water Flow¹⁰	N/A 3 gpm11.4 dm³/min	N/A 6 gpm22.7 dm³/min	N/A 9 gpm34.2 dm³/min	N/A 6 gpm22.7 dm³/min	N/A 12 gpm45.4 dm³/min
Pressure Drop Coefficient C1¹¹	N/A 3.20E-04 6.7E-02	N/A 1.7E-0212 8.20E-05	N/A 7.40E-03 7.4E-02	N/A 1.20E-04 2.4E-02	N/A 2.90E-05 6.0E-03
Pressure Drop Coefficient C2¹²	N/A 0
Engaging Volume New Single Piston or both Pistons Together¹³	N/A 3 in³0.05 dm³	N/A 7 in³0.11 dm³	N/A 10 in³0.16 dm³	N/A 13 in³0.21 dm³	N/A 27 in³0.44 dm³
Engaging Volume Worn Single Piston or both Pistons Together¹⁴	N/A 20 in³0.33 dm³	N/A 24 in³0.39 dm³	N/A 27 in³0.44 dm³	N/A 64 in³1.05 dm³	N/A 77 in³1.26 dm³
Engaging Volume New Dual Piston Large Piston Only¹⁵	N/A 2 in³0.03 dm³	N/A 4 in³0.07 dm³	N/A 5 in³0.08 dm³	N/A 10 in³0.16 dm³	N/A 20 in³0.33 dm³
Engaging Volume Worn Dual Piston Large Piston Only¹⁶	N/A 11 in³0.18 dm³	N/A 12 in³0.2 dm³	N/A 14 in³0.23 dm³	N/A 48 in³0.79 dm³	N/A 58 in³0.95 dm³
Engaging Volume New Dual Piston Small Piston Only¹⁷	N/A 2 in³0.03 dm³	N/A 3 in³0.05 dm³	N/A 5 in³0.08 dm³	N/A 3 in³0.05 dm³	N/A 7 in³0.11 dm³
Engaging Volume Worn Dual Piston Small Piston Only¹⁸	N/A 10 in³0.16 dm³	N/A 11 in³0.18 dm³	N/A 13 in³0.21 dm³	N/A 16 in³0.26 dm³	N/A 19 in³0.31 dm³
Maximum Slip Speed¹⁹	N/A 2150 rpm	N/A 2150 rpm	N/A 2150 rpm	N/A 1260 rpm	N/A 1260 rpm
Maximum Freewheeling Speed²⁰	N/A 3400	N/A 3400	N/A 3400	N/A 2100	N/A 2100
Housing (Weight)	N/A 61 lb28 kg	N/A 82 lb37 kg	N/A 120 lb54 kg	N/A 217 lb98 kg	N/A 284 lb129 kg
Disc & Gear (Weight)	N/A 19 9	N/A 17 39	N/A 27 59	N/A 22 48	N/A 39 86
Center of Gravity housing²¹	N/A 3.17 in81 mm	N/A 4.44 in113 mm	N/A 5.55 in141 mm	N/A 3.69 in94 mm	N/A 5.26 in134 mm
Center of Gravity Disc & Gear²²	N/A 2.05 52	N/A 3.38 86	N/A 116 4.55	N/A 2.42 61	N/A 3.83 97
Housing (Inertia)	N/A 9 lb·ft²0.38 kg·m²	N/A 12 lb·ft²0.51 kg·m²	N/A 15 lb·ft²0.64 kg·m²	N/A 64 lb·ft²2.7 kg·m²	N/A 83 lb·ft²3.5 kg·m²
Disc & Gear (Inertia)	N/A 0.3 0.8	N/A 0.6 1.5	N/A 0.04 2.33	N/A 0.27 6.4	N/A 0.53 12.6
Water Volume	N/A 12 in³0.2 dm³	N/A 24 in³0.4 dm³	N/A 36 in³0.6 dm³	N/A 40 in³0.7 dm³	N/A 75 in³1.2 dm³
Lining Wear Volume	N/A 10	N/A 20	N/A 30	N/A 29	N/A 58
General Description	N/A 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	N/A Drilling rigs Dynamometer Logging equipment Marine mooring systems Slip clutches Tension brakes Unwind stands
Features	N/A 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	N/A 1.00 in (25 mm) for 108WCB 1.38 in (35 mm) for 208WCB 0.857 in (4.8 mm) for 308WCB 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.	N/A 1.00 in (25 mm) for 108WCB 1.38 in (35 mm) for 208WCB 0.857 in (4.8 mm) for 308WCB 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.	N/A 1.00 in (25 mm) for 108WCB 1.38 in (35 mm) for 208WCB 0.857 in (4.8 mm) for 308WCB 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.	N/A 1.06 in (27 mm) for 114WCB & 314WCB 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.	N/A 1.06 in (27 mm) for 114WCB & 314WCB 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.
Manufacturer	N/A Eaton-Airflex
Actuation	N/A 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 American National Pipe Thread ⁸ Exact torque rating is dependent upon applied pressure. Maximum allowable pressure is 150 psi (10.3 bar). ⁹ 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. ¹⁰ 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 ¹¹ Pressure drop coefficient based on maximum pressure drop across brake. Pressure Drop = C₁ x Flow² + C₂ x Flow ¹² Pressure drop coefficient based on maximum pressure drop across brake. Pressure Drop = C₁ x Flow² + C₂ x Flow ¹³ Absolute volume of cylinder at contact with new and worn friction discs. ¹⁴ Absolute volume of cylinder at contact with new and worn friction discs. ¹⁵ Absolute volume of cylinder at contact with new and worn friction discs. ¹⁶ Absolute volume of cylinder at contact with new and worn friction discs. ¹⁷ Absolute volume of cylinder at contact with new and worn friction discs. ¹⁸ Absolute volume of cylinder at contact with new and worn friction discs. ¹⁹ Based upon a continuous slip velocity of 4500 fpm (22.9 mps). ²⁰ Maximum freewheeling velocity is 7500 fpm (38.1 mps). ²¹ Located from mounting flange surface. ²² Located from mounting flange surface.

4900 North 20th St. Philadelphia, PA 19144
P: (800) 925-8824 P: (215) 455-4900
F: (215) 455-8888 rowland@rowland2.com

Since 1732, The Rowland Company is a specialty distributor/fabricator of industrial power transmission components. The Rowland Company specializes in providing solutions to our customers, tailored to their specific needs. Typically, the products used in these applications are brakes, clutches, couplings, universal joints, gear boxes, variable speed drives, friction material, crane electrification and other related items.