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    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) 

    VIEW PDF 

    D3F3R-STH 

    222 lb-in 

    60-65 PSI 

    0.875 in (21 mm) 

    VIEW PDF 

    D4F3R-STH 

    497 lb-in 

    60-65 PSI 

    1.125 in (28 mm) 

    VIEW PDF 

    D5F3R-STH 

    985 lb-in 

    60-65 PSI 

    1.438 in (38 mm) 

    VIEW PDF 

    D6F3G-STH 

    2,296 lb-in 

    60-65 PSI 

    2.000 in (52 mm) 

    VIEW PDF 

    D8F3K-STH 

    4,326 lb-in 

    60-65 PSI 

    2.375 in (66 mm) 

    VIEW PDF 

    DAF3K-STH 

    8,775 lb-in 

    60-65 PSI 

    2.750 in (72 mm) 

    VIEW PDF 

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