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Cylindrical Gear Boxes

Crane Duty Helical Gearboxes

The crane duty helical gearbox is developed on the basis of hardened reducer for crane.The crane duty gearbox is welded with steel plate, the box is annealed to remove stress, the gear is made of high quality low carbon alloy steel, the tooth surface is carburized and quenched, and grinded. The product is stable in quality and reliable in performance.
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Crane Duty Helical Gearboxes

1. Product description

Concept:QJ series crane duty helical gearbox is suitable for crane operation mechanism, also widely used in transportation, metallurgy, mining, chemical industry, light industry and other mechanical equipment transmission machinery.

Material of gears and bearings:20CrMnTi/40Cr/42CrMo

Hardness of gears and bearings:58~62 HRC/217~255HB

Gear handling method:Carburizing and quenching treatment

                                   Hardness of Tooth Surface 58~62 HRC

                                   Core Hardness 30~42 HRC

2. Characteristics

 1). Wide range of deceleration ratio, nominal speed ratio 10-200

 2). High efficiency of mechanical transmission, 96% in the second level and 94% in the third level.

 3). Smooth operation and low noise

 4). Because 42CrMo and 35CrMo are forged and tempered to make gear shafts and gears respectively, their service life is long.

 5). Easy to disassemble and install.

 6). Small size and light weight

 7). Use multi-series to reduce single-stage speed ratio. It can open the center distance, reduce the whole height of reducer, and meet the requirements of crane agencies.

3. Applicable Conditions

 1). Gear circumferential velocity not more than 20m/s

 2). Speed of high speed shaft is not more than 1500r/min

 3). The working environment temperature is - 40℃- 45℃.

 4). It can operate in both positive and negative directions.

4. Model and Speed Ratio

 Model Speed ratio
QJR/QJR-D  10/12.5/16/20/25/31.5



5.Sign and order symbol 

Example:QJS type crane duty helical gearbox QJS3560-50-III-CW.


Note:three-stage transmission of crane reducer, nominal center distance A1 = 560mm, nominal transmission ratio 50. Assembly type III, output shaft end of gear, horizontal installation.

6. Packaging & Delivery

Packing details: To be packed in wooden cases.

Loading Port: Shanghai or Ningbo,China

Delivery time: Within 25-35 working days after we have received the full payment. 

包装图片 2工厂包装0_副本

7. Our advantage 

  We can understand the drawing with tolerance,material and process way correctly.and we have experienced and professional team control the quality.

8. Supply Ability

   3000 set per Month. 

9. Our service

 l Quick and safe delivery .

 l ISO certificate .

 l More than 10 years reducer and motor sale experience .

 l Chinese motor and reducer golden supplier .

 l Good after-sales service .

 l 1 year warranty period .

10. Product Pictures





11.  Recommend Products:

S主新R seriesK series

     Worm Helical Gearbox             Helical Gearbox                          Helical Bevel Gearbox


Parallel Shaft Helical Gear Motor       Conveyor Drive Pulley     Polygon Hard-Tooth-Faced Gear Motors

12. Our Factory

13. Our Certificate

sts certificate.jpg

14. FAQ

1.What is your terms of payment ?
  30% advance payment by T/T after signing the contract.70% before delivery.

2.How to choose a gearbox which meets our requirement?

  You can refer to our catalogue to choose the gearbox.

3.If you can help on selecting a right model for me ?

  Yes. we offer customized service for customers.

15.How to contact us?


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