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DBA
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Catalog excerpts

DBA - 1

Model DBA brakes are spring applied, pressure released, disc style brakes. They develop equal torque in either direction of rotation. Their torque and thermal capacities allow them to be used in the most demanding applications. Brake construction and operation Is shown in the figure. Pressurizing the brake compresses the brake springs and withdraws the clamping plates from the brake discs. Standard brakes are furnished with either one or two discs, which are free to move axlally. Model DBA uses a rubber diaphragm to form the releasing pressure chamber and to serve as the releasing piston. Brake friction material Is attached to stationary components. Brake discs are either solid or ventilated. The disc type is indicated by an S for solid, or V, for ventilated, in the brake model designation. Solid discs are used In applications requiring a heat sink and/or where engagement is Infrequent. Ventilated discs are recommended for cyclic applications. Torque ratings listed are for brakes with a standard compliment of springs. The quantity of springs can be varied to customize the torque of the brake to suit a particular application. Consult the factory for brake torque of units with non-standard spring configurations. Brake sizes are indicated by the number of brake discs and the disc diameter In inches. For instance, size 229DBA has two discs 29 Inches Large friction area. Allows brakes to absorb and dissipate high en- ergy loads associated with high cyclic and high inertia stops. Minimal adjustment required for lining wear. Single disc units require no wear adjustment and dual disc units require only one wear ad- justment during the long life of the friction ma- Where used: Power shovels Power presses Copyright Eaton Corporation, 1997, All rights reserved.

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DBA - 2

Airflex DBA Component parts Item Number Description Mounting Flange Clamp Tube Friction Disc Flat Head Screw Pressure Plate Spring Housing Outer Clamp Ring Inner Clamp Ring Spring Retainer Plate Inner Spring Outer Spring Reaction Plate Release Spring Wear Spacer Name Plate Self Tapping Screw Warning Decal Hose Assembly Flow Control Valve Copyright Eaton Corporation, 1997, All rights reserved.

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DBA - 3

Airflex DBA Brake Elements Form DBA808 Dimensional and Technical Data English Dimensions in inches Basic Size English Dimensions in inches Ventilated Disc Types Solid Disc Types O All ventilated disc brakes are furnished with an ap- proximate 15.5 inch (394 mm) length of flexible hose and a flow control valve having a 1-11 1/2 American National Pipe Thread port. © American National Pipe Thread © Minimum bore based on catalog rated torque and n standard spring configuration. © Maximum bore based on catalog rated torque and n Copyright Eaton Corporation, 1997, All rights reserved.

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DBA - 4

Dimensional and Technical Data O Basic part number only. Does not include gear. Gear must be ordered separately with the bore and keyway requirements. 0 Dynamic torque shown. Static torque approxi- mately 1.15 greater. Torque values are for new lin- ings. Torque decreases with lining wear. At the worn out condition, torque is approximately 0.66 © Torque ratings are for units with a standard com- plement of springs. Consult factory for torque rat- ings of units with non-standard spring O Maximum allowable cylinder pressure is 120 psi 0 Absolute volume of releasing cavity. 0 Minimum releasing...

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