Item # 146373, DBB Brakes On The Rowland Company

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	Item # 146373, DBB Brakes

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

320DBBS

Dimension D

16.63 in
422 mm

Dimension D₁

10.31 in
262 mm

Dimension D₃₁

1.50 in
38 mm

Dimension D₄₄

0.38 in
10 mm

Dimension D₄₅

1.00 in
25 mm

Dimension H₁₆

8.50 in
216 mm

Dimension J¹

23.250 in
590.6 mm

Dimension J₁

18.250 in
463.5 mm

Dimension J₂

23.82 in
605 mm

Dimension O₂

1/2-14 NPT

Minimum Bore

4.88 in
124 mm

Maximum Bore

5.75 in
146 mm

Dynamic Torque Rating

224000 lb·in
25.290 Nm

Disc & Gear (Inertia)

120 lb·ft²
506 kg·m²

Disc & Gear (Weight)

357 lb
162 kg

Housing (Weight)

720 lb
327 kg

Minimum Releasing Pressure²

90 psi
6.2 bar

Maximum Speed

2200 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 +0.120/-0.120 in (+3.00/-3.00 mm)
Brake in disengaged position.
Basic part number only. Does not include gear. Gear must be ordered separately with bore and keyway requirements.

MORE IMAGES


	· DBB - Single/Dual Disc Brakes

	· DBBS - Non-Cyclic Solid Disc Brakes Single/Dual Disc Element

	· DBBS - Non-Cyclic Solid Disc Brakes Mounting Circles

DOWNLOADS


		DBBS - Non-Cyclic Solid Disc Brakes (PDF, 75KB)

Item # 146373, DBB Brakes