The Rowland Company
The Rowland Company
4900 North 20th St.
Philadelphia, PA 19144
Toll Free: (800) 925-8824
Phone: (215) 455-4900
Fax: (215) 455-8888
Email: rowland@rowland2.com
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The type VC element assembly is specifically designed and built for severe clutch or brake applications in which large inertia loads and sustained slippage would normally result in loss of torque and reduced operating life.
Form VC-501
Single Narrow VC Elements
Unit of Measure
Items Single Narrow VC Elements
142639
Single Narrow VC Elements 		Single Narrow VC Elements
143829
Single Narrow VC Elements 		Single Narrow VC Elements
142640
Single Narrow VC Elements 		Single Narrow VC Elements
142641
Single Narrow VC Elements 		Single Narrow VC Elements
142642
Single 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 27 lb·in3.05 Nm N/A 39.2 lb·in4.43 Nm N/A 65 lb·in7.34 Nm N/A 93 lb·in10.505 Nm N/A 135 lb·in15.25 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 Cs 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 43 lb·ft²1.81 kg·m² N/A 78 lb·ft²3.28 kg·m² N/A 115 lb·ft²4.83 kg·m² N/A 193 lb·ft²8.11 kg·m² N/A 369 lb·ft²15.5 kg·m²
Weight N/A 96 lb43 kg N/A 128 lb58 kg N/A 151 lb68 kg N/A 179 lb81 kg N/A 246 lb111 kg
Friction Area N/A 166 in²1071 cm² N/A 205 in²1322 cm² N/A 283 in²1825 cm² N/A 380 in²2451 cm² N/A 466 in²3006 cm²
Friction Lining Thickness N/A 0.32 in N/A 0.32 in N/A 0.32 in N/A 0.32 in N/A 0.44 in
New Friction Lining Thickness N/A 8 mm N/A 8 mm N/A 8 mm N/A 8 mm N/A 11 mm
Worn Friction Lining Thickness N/A 0.16 in4 mm
Air Tube Cavity2 N/A 70 in³1.15 dm³ N/A 95 in³1.56 dm³ N/A 120 in³1.97 dm³ N/A 140 in³2.3 dm³ N/A 200 in³3.28 dm³
Minimum Drum Diameter N/A 11.41 in290 mm N/A 13.91 in353 mm N/A 15.91 in404 mm N/A 19.88 in505 mm N/A 23.88 in607 mm
Dimension D2 N/A 6.13 in156 mm N/A 6.13 in156 mm N/A 7.38 in187 mm N/A 7.38 in187 mm N/A 7.69 in195 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 D24 N/A 2.38 in60 mm N/A 2.88 in73 mm N/A 2.88 in73 mm N/A 2.88 in73 mm N/A 2.88 in73 mm
Dimension D25 N/A 0.38 in10 mm N/A 0.58 in15 mm N/A 0.59 in15 mm N/A 0.59 in15 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/-0.20 mm N/A +0.000/-0.005 in+0.00/-0.20 mm N/A +0.000/-0.005 in+0.00/-0.20 mm N/A +0.000/-0.005 in+0.00/-0.20 mm N/A +0.000/-0.010 in+0.00/-0.25 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
Diameter L 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
Dimension 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
Dimension O4 (Number) N/A 2 N/A 4 N/A 4 N/A 4 N/A 4
Dimension O4 (Size) N/A 3/8-18 NPT N/A 3/8-18 NPT N/A 3/8-18 NPT N/A 3/8-18 NPT N/A 1/2-14 NPT
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 in0.56 mm N/A 0.56 in0.56 mm N/A 0.69 in0.69 mm N/A 0.69 in0.69 mm N/A 0.59 in0.59 mm
W Number N/A 8 N/A 8 N/A 8 N/A 10 N/A 12
Friction Shoe Width (W) N/A 5.00 in127 mm N/A 5.00 in127 mm N/A 6.00 in152 mm N/A 6.00 in152 mm N/A 6.50 in165 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 Part Number refers to basic part number only. When ordering, the number of air inlets and type of connection must be specified.
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.