Item # 142739, Single Wide VC Elements On The Rowland Company

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	Item # 142739, Single Wide VC Elements

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Form VC-503

Unit of Measure: Imperial Metric Both

Specifications · General Description · Features · Where Used · Note

Specifications

Size

38VC1200

Torque Rating (75 psi/5.5 bar)

680 lb·in
7683 Nm

Maximum Speed¹

740 rpm

Centrifugal Loss C_s

5.66 E-06 bar/rpm²
82 E-06 psi/rpm²

WK²

2330 lb·ft²

Dimension J

97.86 kg·m²

Weight

684 lb
310 kg

Friction Area

1360 in²
8772 cm²

New Friction

0.57 in
14 mm

Worn Lining Thickness

0.38 in
10 mm

Air Tube Cavity²

755 in³
12.4 dm³

Minimum Drum Diameter

37.81 in
960 mm

Dimension D₂

13.75 in
349 mm

Dimension D₃

0.47 in
12 mm

Dimension D₂₄

3.13 in
79 mm

Dimension D₂₅

0.69 in
18 mm

Dimension G

49.375 in
1254.1 mm

Tolerance for Sizes (G)

+0.000/-0.010 in
+0.00/-0.25 mm

Dimension H₂

47.875 in
1216 mm

Dimension H₆

38.22 in
971 mm

Dimension H₇

48.00 in
1219 mm

Number of Hole L

Dimension L Diameter

0.750 in
19.1 mm

Tolerance for L

+0.005/-0.000 in
+0.13/-0.00 mm

Dimension O₃

0.63 in
16 mm

O₄ Number

Size O₄

3/4-14 NPT

Angle Q

9.000 º

Dimension V

0.88 in
22 mm

W Number

Friction Shoe Width (W)

12 in
305 mm

Manufacturer

Eaton-Airflex

Actuation

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.

General Description

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

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

Grinding Mills
Marine Propulsion
Metal Forming Machinery
Oil Field Machinery

Note

Part Number refers to basic part number only. When ordering, the number of air inlets and type of connection must be specified.

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Item # 142739, Single Wide VC Elements