A drawworks gearbox includes additional braking on the input side of the gearbox to provide a redundant emergency brake and, optionally, a separate parking brake with the drumside brakes being the emergency brake. An air-cooled brake disc is attached to a high speed coupling connected to the gearbox input pinion. A hydraulic-apply, spring-release brake is mounted to the gearbox housing at each pinion location and arranged to act on its respective disc.
DRAWWORKS GEARBOX WITH REDUNDANT BRAKING ON INPUT SIDE
BOITE D'ENGRENAGES DE TREUIL DE FORAGE A FREINAGE REDONDANT SUR LE COTE ENTREE
2018-04-10
Patent
Electronic Resource
English