Worm Gears & Worm Shafts
Sango precision Worm Gears and Thread-Ground Worm Shafts deliver high single-stage reduction ratios (5:1 to 100:1), self-locking safety capability, and whisper-quiet power transfer between non-intersecting perpendicular shafts.
Sango Automation Limited is a recognized Chinese manufacturer of high-precision worm gearing. Combining centrifugal cast CuSn12 bronze worm wheels with CNC thread-ground alloy steel worm shafts, we deliver exceptional durability and smooth sliding mesh.
Features & Advantages
Engineered for high reduction ratios, self-locking safety, and ultra-quiet operation under heavy sliding loads.
Centrifugally Cast Bronze Worm Wheels (CuSn12Ni2)
Dense, defect-free microstructures offer exceptional anti-friction properties and high resistance to adhesive wear and galling.
CNC Thread-Ground Carburized Worm Shafts (Ra ≤ 0.2 μm)
Ground on Klingelnberg CNC worm grinders to DIN 4 accuracy with mirror surface polish, minimizing friction coefficient and maximizing service life.
Optional Duplex Anti-Backlash Dual-Lead Design
Progressive dual-lead thread profile enables precise axial backlash adjustment down to < 1 arcmin without altering center distances.
Inherent Self-Locking Static Holding
Low lead angles (<5°) provide natural mechanical self-locking, preventing back-driving and eliminating external mechanical brake requirements in hoists.
Technical Specifications
Standard manufacturing parameters and precision classes for custom worm wheels and worm shafts.
| Core Parameters | Standard Commercial Worm Set | Precision Duplex / Ground Grade |
|---|---|---|
| Module Range | 0.5 – 10.0 Module | 0.4 – 16.0 Module (Custom) |
| Thread Starts (z1) | 1, 2, 3, 4 Starts | 1, 2, 3, 4, 6 Starts (Duplex available) |
| Reduction Ratio Range | 10:1 to 100:1 | 5:1 to 120:1 (Single Stage) |
| Worm Wheel Material | Phosphor Bronze (CuSn10P1) | Centrifugal Tin Bronze (CuSn12Ni2) / Al-Bronze |
| Worm Shaft Material | 40Cr / 45# Hardened | 20CrMnTi / 18CrNiMo7-6 (HRC 58–62 Ground) |
| Shaft Thread Accuracy | ISO 6 / DIN 6 | ISO 4 / DIN 4 (Klingelnberg Ground) |
| Backlash Standard | 4 – 8 arcmin | < 1 arcmin (Adjustable Duplex) |
Standard Worm Sets vs. Duplex Anti-Backlash Worm Sets
Comparing standard constant-pitch worm drives with high-precision adjustable duplex worm drives.
| Feature Metric | Standard Worm Set | Duplex Anti-Backlash Worm Set |
|---|---|---|
| Thread Geometry | Constant pitch throughout worm length | Dual lead: differing pitches on right and left flanks |
| Backlash Adjustability | Fixed backlash; increases with wear | Adjustable axially to compensate for backlash & wear |
| Positional Accuracy | Standard (±2–4 arcmin) | High Precision (<1 arcmin) for rotary tables |
| Manufacturing Method | Standard thread milling / hobbing | Specialized CNC dual-lead thread grinding |
| Primary Applications | Lifts, conveyors, general speed reducers | CNC 4th/5th axis rotary tables, radar positioners |
Application Scenarios
Worm drives are widely used in CNC rotary indexers, stage rigging hoists, elevator gearboxes, packaging machinery, solar trackers, and steering mechanisms.
