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Electro Thrust (Model ET) Shoe Brakes
Introduction to ET Series Brakes and General Description
 

Design

The Series ET style of shoe brakes are spring set and electrically released by a continuously rated, sealed electrohydrolic actuator. This brake provides smooth brake setting due to the response of the actuator. This inherent cushion effect is desirable for many brake applications. Rugged construction makes this brake suitable for steel mill cranes, container cranes, stacker reclaimers, lock and dam gates, and other heavy-duty applications.

Standard Brake Features Include:

Electro-Thrust actuator Self-aligning cast iron shoes Self-centering shoes Over-the-wheel tie rod Asbestos-free bonded linings External torque spring Floor mounting Torque indicator Adjustable setting time

Optional Features Offered Are:

Time delays for brake release and/or brake setting Enclosures for both NEMA 4 and NEMA 3R ratings Heater/Thermostat assemblies for use with enclosures Limit switch for indication of "brake set" and/or "brake released" Self-adjust mechanism Auxiliary hydraulic cylinder Hand release (latching or non-latching) Limit switch for indication of "hand release latched"

Brake Actuator Operation

The Electro-Hydraulic actuator has a standard 56C motor that drives and impeller inside a heavy duty cast aluminum housing. Energizing the motor rotates the impeller, which hydraulically extends a cylinder. This in turn releases the brake by overcoming the main brake spring.   The design of the impeller allows operation of the motor in either direction. And adjustable setting valve is provided as a standard feature to allow delayed brake setting.   Employing a "standard" 56C motor results in 460 volt, 3 phase, 60Hz. operation or 230 V.D.C. operation. Other voltages available depending on motor availability.   The Electro-Thrust actuator provides a trouble-free brake operation. There are no magnets involved that traditionally accumulate dirt and other debris. The actuator is completely enclosed in a mill duty style housing with a large reservoir for heat dissipation.