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Gearbox
Introduction
Main parameters
| Series | PEM300.7.2 |
The crane gear reducer is the core transmission component in the lifting equipment. Its performance characteristics directly affect the operating efficiency, stability and safety of the crane. The following are its main performance characteristics:
Hard tooth surface technology
The gear is made of 20CrMnTi alloy steel carburized and quenched (hardness 58-62 HRC) + precision grinding (ISO level 6 accuracy), and the fatigue resistance is increased by 40%.
Modular design
Supports parallel axis and planetary stage combinations, adaptable to various lifting/running/rotating mechanisms.
Long maintenance-free period
Standard labyrinth seal + double lip oil seal, IP55 protection, maintenance interval ≥8,000 hours.
Good speed regulation performance
Multi-stage reduction ratio: Through multi-stage gear combination (such as three-stage reduction), a wide range of speed ratios (common 5~200) can be achieved to meet the needs of different working conditions such as crane lifting and walking.
Matching with motor: It can be matched with variable frequency motor or hydraulic motor to achieve stepless speed regulation and adapt to precise lifting.

The Gear Reduction Boxs are usually used in conjunction with overhead cranes, gantry cranes, jib cranes and electric hoists, and are widely used in the following scenarios:
The crane hooks, crane wheels,crane pulleys,crane drums, crane couplings,crane electrica!accessories, crane slings and other accessories produced by Weihua Crane are widely used inmajor brands and various types of Port crane products.
parameter
| Parameter item | Standard range |
| Rated output torque (T₂ₙ) | 5,000–300,000 N·m |
| Rated input power (P₁) | 7.5–800kW |
| Transmission ratio (i) | 10–500 |
| Service Factor (SF) | 1.12(A4)–1.8(A8) |
| Center distance (a) | 160–850mm |
| Installation form | Flange type/base type/hollow shaft set |
| Mechanical efficiency | ≥96% (single level) |
| Design life (rated operating conditions) | ≥20,000 hours |
| Working temperature | -25℃ ~ +50℃ |
| Protection level | IP55/IP65 (optional) |
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