Product:Twiflex VKSD Spring-Applied, Hydraulically-Released Caliper Brakes
A major elevator OEMspecifies Twiflex VKSD disc brakesfor use on high-performance elevator drives installed in skyscrapers.The dual function brakesstop the elevator cars precisely at the correct floor level and also decelerate the carsin an emergency (such as a malfunction). Two calipermodules are used on each elevator drive to provide the required redundant safety.
Unlike electromagnetically actuated brakesfound in conventional elevators, the VKSD brakes are hydraulically actuated since each caliper’s clamping force exceeds 100 kN.A dedicated dual-circuit hydraulic unit (also supplied by Twiflex) generatesthe necessary oil pressure for both brake calipers.
The brake systemis designed to dissipate the large amount of kinetic energy(whichmay exceed 2 kWh) generated bythis high rise elevator application. Brake disc temperature can rise bymore than 100K during an emergency stop.
The Twiflex VKSD disc brake caliper range is available in a standard configuration comprising two springmodules acting on each side of the disc or, asshown above, as a 'floating' brake. The minimum disc thickness is 20mm, minimum disc diameter is 1000mm. Rated braking force extends from 28 kN to 119 kN, with a nominal coefficient of friction mu = 0.4.
Download Application Profile |