Machine Design
Scanning for ideas:Caliper Brakes Engage Using Springs But Disengage Using Hydraulics

Scanning for ideas:Caliper Brakes Engage Using Springs But Disengage Using Hydraulics

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A new set of brakes from Nexen Group, Vadnais Heights, Minn. (, uses spring engagement and hydraulic disengagement to provide reliable dynamic braking and static holding.

Fixed-point pivots ensure braking forces are applied to both sides of the brake rotor. And each pivot point uses oilless bearings, which reduces maintenance. A relatively large friction surface on the brake area minimizes facing pressure, which should extend the face life. Quick-release pins that make it easy to remove the brake shoes from the actuator arms and replace the friction pads further streamline maintenance.

Four actuator settings let users adjust clamping forces from 600 to 3,100 lb. Users also have the flexibility of mounting the actuators on either side of the brake, thanks to interchangeable actuator locations. And adjustment screws on both sides of the brake hold the arm position to maintain facing/disc clearance in vertical applications. A novel, nested spring minimizes spring-force losses while letting users modify the braking torque.

Large ports ensure quick brake activation, even when hydraulic fluid is at a low temperature, so the brake operates despite temperatures as low as –30°F. Traditional pneumatic brakes and clutches don’t work below 32°F.

A manual disengagement option (kit not shown) lets technicians safely service the brakes.

© 2011 Penton Media, Inc.

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