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 amore
Unit of Measure

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

Specifications

Model

 309DBB

Dimension D

 9.06 in202 mm

Dimension D1

 5.25 in133 mm

Dimension W4

 9.06 in230 mm

Dimension D31

 1.00 in25 mm

Dimension D44

 0.25 in6 mm

Dimension D45

 0.00 in0 mm

Dimension H16

 3.12 in79 mm
Dimension J1 12.125 in308.0 mm

Dimension J1

 8.375 in212.7 mm

Dimension J2

 12.37 in314 mm

Dimension O2

 3/8-18 NPT

Minimum Bore

 2.13 in54 mm

Maximum Bore

 2.63 in67 mm

Dynamic Torque Rating

 19400 lb·in2192 Nm

Disc & Gear (Inertia)

 1.83 lb·ft²0.07 kg·m²

Disc & Gear (Weight)

 27 lb12 kg

Housing (Weight)

 135 lb36 kg
Minimum Releasing Pressure2 60 psi4.1 bar

Maximum Speed

 3000 rpm

Manufacturer

 Eaton-Airflex

Actuation

 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).