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

 438DBBS

Dimension D

 26.34 in669 mm

Dimension D1

 18.00 in457 mm

Dimension D31

 2.45 in62 mm

Dimension D44

 0.25 in6 mm

Dimension D45

 1.00 in25 mm

Dimension H16

 16.50 in419 mm
Dimension J1 44.498 in1135.7 mm

Dimension J1

 36.375 in923.9 mm

Dimension J2

 45.00 in1143 mm

Dimension O2

 3/4-14 NPT

Minimum Bore

 10.38 in264 mm

Maximum Bore

 10.38 in264 mm

Dynamic Torque Rating

 2200000 lb·in248.391 Nm

Worn Torque Multiplier

 0.79

Disc & Gear (Inertia)

 2285 lb·ft²9641 kg·m²

Disc & Gear (Weight)

 2264 lb1.029 kg

Housing (Weight)

 4975 lb2.261 kg
Minimum Releasing Pressure2 90 psi6.2 bar

Maximum Speed

 950 rpm

Manufacturer

 Eaton-Airflex

Actuation

 Spring Applied, Air Release

Note

N/A 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).