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Item # 146148, DBA Brakes


Model DBA 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 DBA uses a rubber diaphragm to form the releasing pressure chamber and to serve as the releasing piston. Brake friction material is attached to stationary components. Brake discs are either solid or ventilated. The disc type is indicated by an S for solid, or V, for ventilated, in the brake model designation. Solid discs are used in applications requiring a heat sink and/or where engagement is infrequent. Ventilated discs are recommended for cyclic applications.

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 nonstandard spring configurations.

Brake sizes are indicated by the number of brake discs and the disc diameter in inches. For instance, size 229DBA has two discs 29 inches in diameter.



Unit of Measure: Imperial Metric Both

Features  · Where Used  · Specifications  · General Description

Features
Large friction area.
Allows brakes to absorb and dissipate high energy loads associated with high cyclic and high inertia stops.

Minimal adjustment required for lining wear.
Single disc units require no wear adjustment and dual disc units require only one wear adjustment during the long life of the friction material.


Where Used
  • Can making machines
  • Draglines
  • Power shovels
  • Conveyors
  • Power presses


Specifications

Model
117DBAV

Dimension D25
2.00 in
51 mm

Dimension H
21.000 in
533 mm

Dimension H11
17.25 in
438 mm

Dimension H13
10.00 in
254 mm

Dimension H16
5.38 in
137 mm

Dimension G1
24.998 in
634.9 mm

Dimension L
0.78 in
20 mm

Dimension O2
1/2-14 NPT

Minimum Bore
2.50 in
64 mm

Maximum Bore
4.25 in
108 mm

Dimension D
12.55 in
319 mm

Dimension D1
11.19 in
284 mm

Dimension D7
4.88 in
124 mm

Dimension D29
1.00 in
25 mm

Dynamic Torque Rating2
20500 lb·in
2320 Nm

Disc & Gear (Inertia)
10 lb·ft²
0.42 kg·m²

Disc & Gear (Weight)
70 lb
32 kg

Housing (Weight)
320 lb
145 kg

Minimum Releasing Pressure
60 psi
4.1 bar

Maximum Speed
1300 rpm

Manufacturer
Eaton-Airflex

Actuation
Spring Applied, Air Release
1 Tolerance +0.000/-0.003 in (+0,00/-0,08 mm)
2 Dynamic torque shown. Static torque approximately 1.15 greater. Torque values are for new linings. Torque decreases with lining wear. At the worn out condition, torque is approximately 0.66 of values shown.


General Description
Model DBA 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 DBA uses a rubber diaphragm to form the releasing pressure chamber and to serve as the releasing piston. Brake friction material is attached to stationary components. Brake discs are either solid or ventilated. The disc type is indicated by an S for solid, or V, for ventilated, in the brake model designation. Solid discs are used in applications requiring a heat sink and/or where engagement is infrequent. Ventilated discs are recommended for cyclic applications.

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 nonstandard spring configurations.

Brake sizes are indicated by the number of brake discs and the disc diameter in inches. For instance, size 229DBA has two discs 29 inches in diameter.


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