The KNOTT Hybrid Brake solution is a magnetic-mechanical brake assembly that combines a small packaging envelope with minimum power consumption and maximum braking power.
- Well suited for use in forklift trucks
- Internally a compact electromagnetic single-disc brake activates the actual main drum brake
- Braking impulse from the operator via the potentiometer brake pedal magnetizes by current a circular floating soft iron ring
- Magnetic circuit is open and is only closed by an armature washer, which rotates while the soft iron ring is swivel-mounted
- During braking process, it rubs against the armature washer, which it constantly touches during freewheeling as well
- Friction lining at center of U-section maintains the coefficient of friction of the electromagnetic brake
- Retention force that develops between the magnet and the armature washer can be controlled by regulating the current flowing through it
- Magnet ring can rotate both clockwise and anti-clockwise through a fixed arc
- Two actuating cams mounted integrally absorb friction forces from magnet braking effect
- Actuating cams apply friction in such a way that the two brake shoes are separated apart from each other, thus increasing their diameter and braking the drum
- Increased braking current leads to more powerful action of brake and doubles self-energizing effect
- Offers large amount of braking torque and remains energy efficient in the process because the braking effect is achieved with current
- Symmetrical design of brake assembly applies braking forces equally in both directions of rotation of the wheel
- Available in two basic versions that cover a wide range of inner transmissions: one with fixed jack stands inside the activating cams, one with them on the outside
- Leverage ratios can be configured differently according to specific machine requirements
- Fine-tuning of braking power is achieved by an electronic control unit (ECU), integrated in the electronic architecture of the vehicle
- ECU offers flexible programmable outputs that adjusts the impulses of electric potentiometer brake pedal to a wide variety of vehicles
- Standard on-board operating voltage is 24V DC
- Allows adjustment for lower and higher voltages
- Size and power of the entire brake assembly can be adjusted to suit a wide variety of different vehicles and requirements
- Does not require readjustment of air gap clearance of brake shoes to the drum surface to accommodate lining wear as in a conventional drum brakes
- Air gap between soft iron ring and rotating armature washer is effectively zero, which is ensured by low force compression springs
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