-ZQA series is medium-hardness-tooth crane gearbox, are mainly used as drive units for crane or hoisting, also widely in mining, cranes, conveyors, textile, and chemical industry, etc. The gearboxes can be supplied as motor gearbox units assembled on baseplates for convenience. Electromagnetic brakes, back stops, clutches, couplings and other mechanical devices can be incorporated in the design to give a complete drive unit.

- Structures: horizontal foot-mounted with solid shaft output or toothed coupling;

 

- Gears made of high-quality low-carbon alloy steel 35CrMo, shafts made of steel C45 of DIN (or 1045 of ASTM, the gearbox housing made of high-strength casting iron HT250;

 

- High efficiency up to 98%per stage, low noise <75-90dB, and temperature rise <45-55℃, and high precision grade up to 6 or better of ISO1328;

 

- Gears and gear shafts through carburizing and quenching to improve stability and transmit power more efficiently, gearbox housing through aging treatment then annealing to relieve stress twice, therefore the bearing capacity very high;

 

- Best China bearings used on products, may apply other bearings like SKF, NSK and FAG, and double-lip oil seal make sure no oil leak;

 

- Every gearbox 100 percent tested prior to delivery;