Spring Engaged Brakes
SPRING AND AIR ENGAGED FRICTION BRAKES
Pneumatic friction brakes from Mach III provide simple solutions for stopping and holding.
Spring engaged brakes remain engaged in the absence of air pressure. They are often referred to as power-off brakes, fail-safe brakes or holding brakes. These brakes are best suited for applications where they are used to prevent rotary motion of a load and are not suitable for dynamic stopping.
Air engaged brakes are applied with compressed air and release in the absence of air pressure. They are often referred to as power-on brakes. These brakes are best suited for bringing a load to a stop and preventing rotary motion of a load.
SPRING ENGAGED BRAKES
Flange Mounted Friction Brakes for Power Off Holding
Function: Holding, Failsafe (Non-Cycling Applications)
Drive Arrangement: Machine Frame or Bracket to Shaft
- Spring pressure compresses drive and friction discs to produce a fixed amount of torque.
- Air pressure is applied to disengage the brake.
Operation
Spring pressure compresses drive and friction discs to produce a fixed amount of torque.
The brake releases when energized with sufficient air pressure (see table below).
Mounting
The brake flange bolts to a machine frame or other fixture, the shaft inserts into the bore and is fixed with a customer supplied key.
Brake can also be mounted mid-shaft with the flange connected to a bracket.
Spring engaged brakes are designed for horizontal mounting. If vertical mounting is required, consult engineering.
Applications
Spring engaged brakes are designed for holding applications.
Maximum RPM varies by model. Please consult the detail sheets (below). Consult engineering if the intended application exceeds the listed maximum RPM.
Design Features
Spring engaged brakes are made-to-order with any bore size up to the maximum shown for easy installation.
Drilled and slotted flange allows for variable installation arrangements.
Low coefficient friction lining versions are available for applications requiring slip or a narrower torque range. Contact engineering for details.
|
Product Code |
Torque |
Brake Release Pressure |
Maximum Bore with Standard Keyway |
Detail Sheet |
|
D2F3R-STH |
91 lb-in |
60 PSI |
0.500 in (12 mm) |
|
|
D3F3R-STH |
222 lb-in |
60-65 PSI |
0.875 in (21 mm) |
|
|
D4F3R-STH |
497 lb-in |
60-65 PSI |
1.125 in (28 mm) |
|
|
D5F3R-STH |
985 lb-in |
60-65 PSI |
1.438 in (38 mm) |
|
|
D6F3G-STH |
2,296 lb-in |
60-65 PSI |
2.000 in (52 mm) |
|
|
D8F3K-STH |
4,326 lb-in |
60-65 PSI |
2.375 in (66 mm) |
|
|
DAF3K-STH |
8,775 lb-in |
60-65 PSI |
2.750 in (72 mm) |
