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

 325DBB

Dimension D

 16.69 in424 mm

Dimension D1

 9.31 in236 mm

Dimension W4

 15.19 in386 mm

Dimension D31

 1.75 in44 mm

Dimension D44

 0.25 in6 mm

Dimension D45

 0.75 in19 mm

Dimension H16

 11.50 in292 mm
Dimension J1 30.630 in778.0 mm

Dimension J1

 24.375 in619.1 mm

Dimension J2

 30.89 in785 mm

Dimension O2

 1/2-14 NPT

Minimum Bore

 5.38 in137 mm

Maximum Bore

 7.50 in191 mm

Dynamic Torque Rating

 303000 lb·in34237 Nm

Disc & Gear (Inertia)

 139 lb·ft²5.84 kg·m²

Disc & Gear (Weight)

 403 lb183 kg

Housing (Weight)

 1120 lb508 kg
Minimum Releasing Pressure2 60 psi4.1 bar

Maximum Speed

 1400 rpm

Manufacturer

 Eaton-Airflex

Actuation

 Spring Applied, Air Release

Note

N/A 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

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