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Constricting Type Clutches and Brakes

Constricting Type Clutches and Brakes
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Constricting Type Clutches and Brakes - 1

Airflex® Constricting Type Clutches and Brakes Section B EATON Airflex® Clutches & Brakes 10M1297GP November 2012

Constricting Type Clutches and Brakes - 2

Airflex® Constricting Features Section B How They Work CB, CM and VC elements utilize a rugged tire-like neoprene and cord tube that expands radially inward when pressurized. The constricting tube forces friction shoes against an outer cylindrical drum surface. The rate at which the tube is pressurized determines the rate at which element torque increases. Final tube pressure determines the element torque capacity. Design Features Plate Clutch • Force applied at maximum radius from axis Airflex constricting elements concentrates the frictional force on the outside drum diameter thereby...

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Constricting Type Clutches and Brakes - 3

Airflex® Constricting Features Section B As friction surfaces wear, the tube constricts further and compensates for the wear. Normal wear will not reduce torque capacity. There are no close fitting sliding components which require lubrication. • Centrifugal force assists clutch disengagement Upon release of tube pressure, centrifugal force, acting on the friction shoes at the rotating element, helps retract the shoes away from the drum surface. The centrifugal effect expels the tube pressurizing media and minimizes the possibility of disengaged friction shoe drag. The constricting design...

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Constricting Type Clutches and Brakes - 4

Airflex® Element Descriptions Section B Elements are described by the number and type of fitting used to make the connection from the tube valve to the rim flange, the type of friction material and any special rim features. Since most of the special rim features pertain to CB elements only, the CB cross section has been used in the illustrations. A glossary of commonly used descriptive terms with their abbreviations in parenthesis follow: Drilling in both anges Dual drilled (DD) - Both flanges of the rim are drilled for air and/or mounting connections. Required for one of the elements used...

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Constricting Type Clutches and Brakes - 5

Airflex® Element Descriptions Section B Single Flange Single flange (SGL FL) - A CB description for rims having one flange. Element sizes 3CB150 thru 10CB300 have one flange. Element sizes 12CB350 and 14CB400 can be furnished single or dual flanged. Slotted rim (SLOT) - A U-shaped cutout in the rim flange providing clearance for piping directly to the valve. Used with pipe adapter and in the small CB clutch applications which incorporate tapered bushings. Flange Machined off Turned down flange (TDF) - Applies to CB elements only. Element sizes 16CB500 thru 45CB525 have dual flange rims....

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Constricting Type Clutches and Brakes - 6

Airflex® CB Construction Section B Single Flange Element The type CB element assembly is designed and built to provide dependable clutch or brake service in the most exacting industrial applications. It is suited to high speed, cyclic operations, as well as for coupling and general power transmission. CB design, construction and operation is quite simple. A neoprene rubber tube reinforced with several plys of cord is bonded on its outside diameter to a steel rim. Friction shoes are attached to the tube’s inside diameter by pins which in turn are held in position by lock wires, except for...

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Constricting Type Clutches and Brakes - 7

Airflex® CB Features Section B Split Elements The tube is the only moving component. There are no springs or sliding parts. Element sizes 6CB200 and up are available in a split configuration. They are used in applications where there is limited axial space for maintenance or where the drum is mounted between bearings and the shaft cannot be moved for maintenance. Sizes through the 10CB300 can only be used as brakes. Larger sizes can also be used in relatively low-speed clutch applications. Note that split tubes are not as durable as standard continuous tube. The following pages give...

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Constricting Type Clutches and Brakes - 8

Airflex® CB Component Descriptions Section B Component Description 1 Elbow Assembly 1A Optional -Quick Release Valve Assembly 1B Optional -Quick Release Valve Muffler 2 Compression Ring 3 Air Connection Tube 4 Air Connection Gasket 5 Friction Shoe Assembly 6 Air Tube Group (Dual Mounted) 7 Spacer Group (Dual Mounted) 8 Shoe Pin 9 Lockwire 5, 8 & 9 Friction Shoe Replacement Kit Notes: This option not available for sizes 3 thru 14. These items are not applicable to sizes 3 thru The friction material is bonded to the rubber tube and is not replaceable. EATON Airflex® Clutches & Brakes...

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Constricting Type Clutches and Brakes - 9

Airflex® CB Element Part Numbers A double alpha suffix is added to the basic element part num- ber to completely describe the element configuration. The basic element part number is shown on the element cat- alog pages. Alphas for the more common element configura- tions are shown on this page. The element part number used in the above example identifies a 16CB500 element equipped with standard friction linings and one side connection. Alpha Suffixes for 3 thru 14 CB Elements Side Connec- Special Rim tions, or QRV's Type of Lining Features Alpha Suffixes Valves only With Side Connections...

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Constricting Type Clutches and Brakes - 10

Airflex® CB Element Part Numbers Alpha Suffixes for 16 thru 45 CB Elements_ Side Connec- Special Rim tions, or QRV's Type of Lining Features Alpha Suffixes with Side with Valves only Connections QRV's 1 Standard Dual Drilled KS LH LJ ~ 1 Cork Dual Drilled LR 2 Cork Dual Drilled LY KL ~ 4 Standard Dual Drilled LS KT KU ~ 4 Cork Dual Drilled LT LU hi Alpha Suffixes for Dual 12 thru 45 CB Elements © tions or QRV's Type of Lining Alpha Suffixes with Side with Connections QRV's O Not available for sizes 3 thru 5. © Dual sizes 12 and 14 elements only available with suffixes DA and DF. EATON...

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Constricting Type Clutches and Brakes - 11

Airflex® Single CB Elements Form CB-401 Technical Data — Sizes 3 to 14 Section B Mr Part Torque Maximum Size Number Rating Speed Cs Centrifugal Wk2 Weight Minimum Loss Friction Friction Lining Air Tube Drum Constant J Mass Area Thickness Cavity Diameter Notes: Refers to basic part number only. When ordering, the number of air inlets and type of connection must be specified. Dynamic torque shown, static torque approximately 25% greater. Torque in each application is dependent upon air pressure and speed. Tolerance for sizes: 3 thru 5 +0.000/-0.003 in (+0,00/-0,08 mm) 6 and larger...

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