The Rowland Company - Dual Narrow VC Elements

Unit of Measure

Items	142112 Dual Narrow VC Elements	142114 Dual Narrow VC Elements	142115 Dual Narrow VC Elements	142116 Dual Narrow VC Elements	142117 Dual Narrow VC Elements
Size	N/A 11.5VC500	N/A 14VC500	N/A 16VC600	N/A 20VC600	N/A 24VC650
Torque Rating (75 psi/5.5 bar)	N/A 54000 lb·in6100 Nm	N/A 78400 lb·in8860 Nm	N/A 130000 lb·in14690 Nm	N/A 186000 lb·in21010 Nm	N/A 270000 lb·in30500 Nm
Maximum Speed¹	N/A 1800 rpm	N/A 1500 rpm	N/A 1400 rpm	N/A 1200 rpm	N/A 1050 rpm
Centrifugal Loss C_s	N/A 1.59 E-06 bar/rpm² 23 E-06 psi/rpm²	N/A 1.93 E-06 bar/rpm² 28 E-06 psi/rpm²	N/A 2.00 E-06 bar/rpm² 29 E-06 psi/rpm²	N/A 2.76 E-06 bar/rpm² 40 E-06 psi/rpm²	N/A 3.38 E-06 bar/rpm² 49 E-06 psi/rpm²
Inertia	N/A 86 lb·ft²3.61 kg·m²	N/A 156 lb·ft²6.55 kg·m²	N/A 230 lb·ft²9.66 kg·m²	N/A 386 lb·ft²16.21 kg·m²	N/A 738 lb·ft²31 kg·m²
Weight	N/A 197 lb89 kg	N/A 258 lb117 kg	N/A 307 lb139 kg	N/A 363 lb164 kg	N/A 497 lb225 kg
Friction Area	N/A 332 in²2141 cm²	N/A 410 in²2645 cm²	N/A 566 in²3651 cm²	N/A 760 in²4902 cm²	N/A 932 in²6011 cm²
New Friction	N/A 0.32 in8 mm	N/A 0.32 in8 mm	N/A 0.32 in8 mm	N/A 0.32 in8 mm	N/A 0.44 in11 mm
Worn Lining Thickness	N/A 0.16 in4 mm
Air Tube Cavity²	N/A 140 in³2.3 dm³	N/A 190 in³3.12 dm³	N/A 240 in³3.94 dm³	N/A 280 in³4.59 dm³	N/A 400 in³6.56 dm³
Minimum Drum Diameter	N/A 11.41 in11.41 mm	N/A 13.91 in13.91 mm	N/A 15.91 in15.91 mm	N/A 19.88 in19.88 mm	N/A 23.88 in23.88 mm
Dimension D₂	N/A 12.75 in324 mm	N/A 12.69 in322 mm	N/A 15.19 in386 mm	N/A 15.19 in386 mm	N/A 15.94 in405 mm
Dimension D₃	N/A 0.23 in6 mm	N/A 0.31 in8 mm	N/A 0.31 in8 mm	N/A 0.31 in8 mm	N/A 0.39 in10 mm
Dimension D₂₅	N/A 0.56 in14 mm	N/A 0.56 in14 mm	N/A 0.56 in14 mm	N/A 0.56 in14 mm	N/A 0.63 in16 mm
Dimension G	N/A 19.625 in498.5 mm	N/A 23.500 in596.9 mm	N/A 25.500 in647.7 mm	N/A 29.500 in749.3 mm	N/A 34.000 in863.6 mm
Tolerance for Sizes (G)	N/A +0.000/-0.005 in+0.00/-0.13 mm	N/A +0.000/-0.005 in+0.00/-0.13 mm	N/A +0.000/-0.005 in+0.00/-0.13 mm	N/A +0.000/-0.005 in+0.00/-0.13 mm	N/A +0.000/-0.008 in+0.00/-0.20 mm
Dimension H₂	N/A 18.875 in479.4 mm	N/A 22.500 in571.5 mm	N/A 24.375 in619.1 mm	N/A 28.375 in720.7 mm	N/A 32.750 in831.9 mm
Dimension H₆	N/A 11.63 in295 mm	N/A 14.22 in361 mm	N/A 16.22 in412 mm	N/A 20.22 in514 mm	N/A 24.22 in615 mm
Dimension H₇	N/A 18.88 in479 mm	N/A 22.25 in565 mm	N/A 24.38 in619 mm	N/A 28.38 in721 mm	N/A 32.50 in826 mm
Number of Hole L	N/A 16	N/A 8	N/A 12	N/A 12	N/A 16
Dimension L Diameter	N/A 0.375 in9.5 mm	N/A 0.500 in12.7 mm	N/A 0.500 in12.7 mm	N/A 0.500 in12.7 mm	N/A 0.625 in15.9 mm
Tolerance for L	N/A +0.005/-0.000 in+0.13/-0.00 mm
O₃ Number	N/A 2	N/A 4	N/A 4	N/A 4	N/A 4
Size O₃	N/A 0.31 in8 mm	N/A 0.38 in10 mm	N/A 0.38 in10 mm	N/A 0.38 in10 mm	N/A 0.50 in13 mm
Angle Q	N/A 11.250 º	N/A 22.500 º	N/A 15.000 º	N/A 15.000 º	N/A 11.250 º
Dimension V	N/A 0.56 in14 mm	N/A 0.56 in14 mm	N/A 0.69 in17 mm	N/A 0.69 in17 mm	N/A 0.59 in15 mm
Number of Friction Shoes	N/A 16	N/A 16	N/A 16	N/A 20	N/A 24
Friction Shoe Width (W)	N/A 11.63 in295 mm	N/A 11.57 in294 mm	N/A 13.81 in351 mm	N/A 13.81 in351 mm	N/A 14.75 in375 mm
General Description	N/A VC design and construction is different from the CB and CM elements in that the torque is transmitted by torque bars rather than the sidewalls of the actuating tube. The loose actuating tube is contained within a housing formed by a rim and two side plates. and is replaceable. The torque bars, which are held in position by the side plates, pass through cavities in the backing plates of the friction shoes. Pressurizing the actuating tube forces the friction shoes to engage around a cylindrical drum. Leaf springs in the torque bar cavities of the backing plates retract the friction shoes when the actuating tube pressure is released. Element torque capacity is dependent upon the applied pressure and rotating speed. Catalog ratings are given at 75 psi (5.2 bar) and zero rpm. Maximum recommended pressure is 125 psi (8.6 bar). Adjustment for pressure and speed is explained under Selection Procedure. VC elements are available in 24 sizes which are identified by the drum diameter in inches on which they constrict and the width in inches of its friction lining. For a given drum diameter it is possible to have two different lining widths. For this reason, the elements are grouped by lining width into a narrow series and a wide series. As an example, the narrow series 20VC600 and the wide series 20VC1000 both constrict on a 20 inch diameter drum. But, the narrow unit has a lining width of 6 inches, and the wide unit has a lining width of 10 inches. The smallest VC element will constrict on a 11.5 inch (292 mm) diameter drum and the largest on a 76 inch (1930 mm) diameter drum. Two elements of a narrow series can be bolted together to form a dual element having twice the torque capacity of a single element. With the exception of the 14VC1000 element, the wide series elements can also be dualed. The large drum hub diameter and small drum diameter restricts the radial space available for mechanically connecting the drums to the hub and makes dualing the 14VC1000 elements impractical. The VC design offers the following features in addition to the constricting features described earlier in this section.
Features	N/A Ventilated Construction Friction shoe backing plates have large air passages through their entire length. This construction coupled with scalloped side plates allows cooling air to flow through the element. In addition, the large exposed inside diameter assures the coolest possible operation. None of the heat is generated deep in the element's internal parts where it can be trapped. The open construction assures rapid heat dissipation. Serviceability The VC clutch can be dismantled on the shaft to gain access to its component parts. All parts are available as replacement parts. A limited number of element sizes are available in a split configuration. They are used in applications having limited axial access for element maintenance. The following pages give additional descriptive information, selection procedures and common clutch and brake arrangements for the complete VC product line.
Where Used	N/A Grinding Mills Marine Propulsion Metal Forming Machinery Oil Field Machinery
Note	N/A Refers to basic part number only. When ordering, the number of air inlets and type of connection must be specified. Sizes 11.5 available with one or two inlets. All other sizes have four inlets.
Manufacturer	N/A Eaton-Airflex
Actuation	N/A Air Applied
¹ Maximum rpm is dependent upon operating conditions and varies for each application. Consult factory for applications exceeding these speeds. ² Drum contact with worn shoes.