Gear boxes are used as a part of drives of all crane mechanisms, mainly for drives of hoists and travels. The connection ends of input and output shafts are performed according the drive type and according to the overall solution of mechanism.
Gear box generally consists of driving and driven shaft, gear assembly and case. Case consists principally of cover and sump. Case of gear box can be designed as casting or weldment, eventually their combination. Lubrication is performed by oil. It can be either forced lubrication (by means of oil gear pump) or splash lubrication.
The size is dependant mainly on motor torque, which is necessary to be transferred from motor to the own driven crane gear.