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Item # 146296, DBB Brakes


Image 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.



Unit of Measure: Imperial Metric Both

Features  · Where Used  · Specifications  · Note

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

Model
238DBB

Dimension D
19.05 in
484 mm

Dimension D1
9.000 in
229 mm

Dimension W4
17.05 in
433 mm

Dimension D31
2.45 in
62 mm

Dimension D44
0.25 in
6 mm

Dimension D45
1.25 in
32 mm

Dimension H16
16.50 in
419 mm

Dimension J1
44.750 in
1136.7 mm

Dimension J1
36.375 in
923.9 mm

Dimension J2
45.01 in
1143 mm

Dimension O2
3/4-14 NPT

Minimum Bore
7.38 in
187 mm

Maximum Bore
11.00 in
279 mm

Dynamic Torque Rating
800000 lb·in
90320 Nm

Disc & Gear (Inertia)
562 lb·ft²
23.60 kg·m²

Disc & Gear (Weight)
340 lb
154 kg

Housing (Weight)
2325 lb
1055 kg

Minimum Releasing Pressure2
60 psi
4.1 bar

Maximum Speed
950 rpm

Manufacturer
Eaton-Airflex

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


Note
Tolerance +/- 0.12
Basic part number only. Does not include gear. Gear must be ordered separately with the bore and keyway requirements.
All DBB brakes can be supplied plumbed as shown with a flow control valve having American National Pipe thread ports of 1/2-14 for size 9DBB, 3/4-14 for sizes 15DBB, 20 DBB, 25DBB and 1-11 1/2 for size 38DBB


 MORE IMAGES 

·  DBB - Single/Dual Disc Brakes

·  DBB - Spring Allied and Pressure Released Disc Brakes Drawing

·  DBB - Spring Allied and Pressure Released Disc Brakes Mounting Circles


 DOWNLOADS 

DBB Components
(PDF, 78KB)


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