The Rowland Company
The Rowland Company
4900 North 20th St.
Philadelphia, PA 19144
Toll Free: (800) 925-8824
Phone: (215) 455-4900
Fax: (215) 455-8888
Email: rowland@rowland2.com
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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.
Eaton DBB Brake Pic.jpg
Unit of Measure
Items Image
146333
DBB Brakes 		Image
146334
DBB Brakes 		Image
146380
DBB Brakes 		Image
146222
DBB Brakes 		Image
146337
DBB Brakes
Features N/A 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 N/A
  • Bottling equipment
  • Power Shovels
  • Conveyors
  • Shears
  • Power Presses
Model N/A 109DBB N/A 209DBB N/A 309DBB N/A 115DBB N/A 215DBB
Dimension D N/A 7.26 in184 mm N/A 8.70 in221 mm N/A 9.06 in202 mm N/A 4.38 in242 mm N/A 11.16 in283 mm
Dimension D1 N/A 1.75 in44 mm N/A 4.00 in102 mm N/A 5.25 in133 mm N/A 2.88 in73 mm N/A 4.38 in111 mm
Dimension W4 N/A 6.06 in154 mm N/A 7.53 in191 mm N/A 9.06 in230 mm N/A 7.52 in191 mm N/A 9.23 in235 mm
Dimension D31 N/A 1.00 in25 mm N/A 1.00 in25 mm N/A 1.00 in25 mm N/A 1.47 in37 mm N/A 1.47 in37 mm
Dimension D44 N/A 0.25 in6 mm N/A 0.25 in6 mm N/A 0.25 in6 mm N/A 0.38 in10 mm N/A 0.38 in10 mm
Dimension D45 N/A 0.50 in13 mm N/A 0.25 in6 mm N/A 0.00 in0 mm N/A 0.38 in10 mm N/A 0.38 in10 mm
Dimension H16 N/A 3.12 in79 mm N/A 3.12 in79 mm N/A 3.12 in79 mm N/A 6.00 in152 mm N/A 6.00 in152 mm
Dimension J1 N/A 12.125 in308.0 mm N/A 12.125 in308.0 mm N/A 12.125 in308.0 mm N/A 18.375 in466.7 mm N/A 18.375 in466.7 mm
Dimension J1 N/A 8.375 in212.7 mm N/A 8.375 in212.7 mm N/A 8.375 in212.7 mm N/A 14.375 in365.1 mm N/A 14.375 in365.1 mm
Dimension J2 N/A 12.37 in314 mm N/A 12.37 in314 mm N/A 12.37 in314 mm N/A 18.94 in481 mm N/A 18.94 in481 mm
Dimension O2 N/A 3/8-18 NPT N/A 3/8-18 NPT N/A 3/8-18 NPT N/A 1/2-14 NPT N/A 1/2-14 NPT
Minimum Bore N/A 1.68 in43 mm N/A 1.94 in49 mm N/A 2.13 in54 mm N/A 2.13 in54 mm N/A 3.06 in78 mm
Maximum Bore N/A 2.50 in64 mm N/A 2.56 in65 mm N/A 2.63 in67 mm N/A 2.50 in64 mm N/A 4.25 in108 mm
Dynamic Torque Rating N/A 7500 lb·in847 Nm N/A 14000 lb·in1581 Nm N/A 19400 lb·in2192 Nm N/A 30000 lb·in3387 Nm N/A 57000 lb·in6435 Nm
Worn Torque Multiplier N/A
Disc & Gear (Inertia) N/A 0.50 lb·ft²0.02 kg·m² N/A 1 lb·ft²0.04 kg·m² N/A 1.83 lb·ft²0.07 kg·m² N/A 5 lb·ft²0.21 kg·m² N/A 10 lb·ft²0.42 kg·m²
Disc & Gear (Weight) N/A 9 lb4 kg N/A 18 lb8 kg N/A 27 lb12 kg N/A 35 lb16 kg N/A 64 lb29 kg
Housing (Weight) N/A 115 lb52 kg N/A 145 lb66 kg N/A 135 lb36 kg N/A 225 lb102 kg N/A 275 lb125 kg
Minimum Releasing Pressure2 N/A 60 psi4.1 bar
Maximum Speed N/A 3000 rpm N/A 3000 rpm N/A 3000 rpm N/A 2400 rpm N/A 2400 rpm
Manufacturer N/A Eaton-Airflex
Actuation N/A Spring Applied, Air Release
Note N/A Tolerance +0.000/-0.003 in (+0.00/-0.08 mm)
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
  • 1 Tolerance +0.000/-0.005 in (+0.00/-0.08 mm)
  • 2 Maximum allowable cylinder pressure is 120 psi (8.3 bar).