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146378

Model DBB 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 axially.

Model DBB uses a conventional piston design to release the brake discs.

The rotating component of the DBB style brake is a very low inertia friction disc core with riveted on friction discs. The low inertia of the rotating components coupled with the high heat sink capacity of the stationary members allow these units to provide superior performance in high cyclic applications. In applications requiring higher speed operation or where precise balance of the rotating components is required, the DBBS style is offered, which utilizes a solid rotor and stationary friction material. Similar to the DBAS design, the DBBS should only be used for applications where brake engagement is non-cyclic.

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 225DBB has two discs 25 inches in diameter.

Features
Low inertia friction disc assembly.
Reduces the overall inertia that must be stopped.

Optional split friction discs.
Allows removal of friction discs without disturbing other components of drive system in mid-shaft brake arrangement.

Long wearing, self lubricating PolyPak seals.
Eliminates premature twisting failure and requires no external lubrication.

Where Used
Bottling equipment
Power Shovels
Conveyors
Shears
Power Presses

Specifications

Gear Part Number

416304

Dynamic Torque Rating

149500 lb·in
16879 Nm

Model

320DBB

Dimension D

15.21 in
386 mm

Dimension D1

8.25 in
210 mm

Dimension W4

13.68 in
347 mm

Dimension D31

1.50 in
38 mm

Dimension D44

0.38 in
10 mm

Dimension D45

1.00 in
25 mm

Dimension H16

8.50 in
216 mm

Dimension J1

23.250 in
590.6 mm

Dimension J1

18.250 in
463.5 mm

Dimension J2

23.82 in
605 mm

Dimension O2

1/2-14 NPT

Minimum Bore

4.25 in
108 mm

Maximum Bore

5.88 in
149 mm

Worn Torque Multiplier

N/A

Disc Gear Inertia

49 lb·ft²
2.06 kg·m²

Disc Gear Weight

213 lb
97 kg

Housing Weight

590 lb
277 kg

Minimum Releasing Pressure2

60 psi
4.1 bar

Maximum Speed

1850 rpm

Manufacturer

Eaton-Airflex

Actualtion

Spring Applied, Air Release

Notes

Tolerance +0.000/-0.005 in (+0.00/-0.08 mm)
Brake in disengaged position.
Basic part number only. Does not include gear. Gear must be ordered separately with bore and keyway requirements.

1 Tolerance +0.000/-0.005 in (+0.00/-0.08 mm)
2 Maximum allowable cylinder pressure is 120 psi (8.3 bar).