Spiral bevel gearbox
Wanshsin WTHR spiral bevel gearbox
Right-angle high-radial-load WTH variant using a spiral bevel stage.
Key specifications
| Ingress protection | IP65 |
|---|---|
| Rated torque (max) | 2,050 Nm |
| Peak torque (max) | 6,150 Nm |
| Speed (max) | 6,000 rpm |
| Ratio | 4–200:1 |
| Backlash (max) | 4 arcmin |
| Sizes | 064, 090, 110, 140, 200 |
| Efficiency | >=95% 1-stage, >=92% 2-stage |
| Rated life | 20,000 h |
Series ranges as published; individual models vary. The full datasheet, drawings and CAD models are available on request.
Typical applications
What a spiral bevel gearbox is
A spiral bevel gearbox turns the drive through 90 degrees using bevel gears with curved, spiral teeth. Curved teeth engage gradually, giving smoother, quieter running and higher load capacity than straight bevels. In servo applications, a spiral bevel stage is often combined with a planetary stage to produce a right-angle precision gearbox. Efficiency is typically high, close to that of a planetary, which makes spiral bevel units preferable to worm gears where efficiency and back-drivability matter.
When engineers choose a spiral bevel gearbox
Choose a spiral bevel gearbox when the motor must sit at right angles to the output to save space, such as on gantries, conveyors and robot arms. It gives efficient, precise right-angle transmission. The trade-offs are cost and limited single-stage ratio compared with worm gears, which reach high ratios in one stage. For self-locking or very high ratios at low cost, a worm gear may suit better, but at lower efficiency.
How to specify the Wanshsin WTHR
Send these with your enquiry and an engineer can confirm the right WTHR variant:
- Ratio and output speed (:1, rpm)
- Output torque, nominal and peak (Nm)
- Backlash (arcmin)
- Input speed limit (rpm)
- Output shaft or hollow bore
- Motor interface
- Radial and axial load (N)
Common mistakes to avoid
- Assuming right-angle units match inline torque ratings
- Ignoring noise at high speed
- Not checking the mounting orientation for lubrication
- Overloading the output bearing with side loads
Wanshsin WTHR: frequently asked questions
What is the Wanshsin WTHR?
Right-angle high-radial-load WTH variant using a spiral bevel stage. Published series figures include rated torque 2,050 Nm, peak torque 6,150 Nm, speed 6,000 rpm, ratio 4:1. It is available through our supply network, and our engineers can confirm the right variant for your application.
Who makes the Wanshsin WTHR?
The Wanshsin WTHR is made by Wanshsin (WANSHSIN Seikou (Hunan) Co., Ltd.) available through our supply network. Send us your requirement for pricing, lead time, datasheets and CAD.
What is the rated torque of the Wanshsin WTHR?
The published series maximum rated torque is 2,050 Nm. Individual models and sizes in the WTHR range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Spiral bevel or worm gearbox for a right-angle drive?
Spiral bevel gears are more efficient, run cooler and back-drive freely, which suits servo axes and dynamic motion. Worm gears offer high ratios in one stage and may resist back-driving, but efficiency falls at high ratios. Choose spiral bevel for servo performance, worm for simple low-cost holding.
Is a right-angle gearbox less precise than an inline one?
Not necessarily, but the added bevel stage typically adds a little backlash and reduces stiffness. Precision right-angle planetaries combine a spiral bevel input stage with a planetary output and publish backlash figures. Compare the right-angle unit's figures directly with the inline version.
Further reading: How to select a gearbox · How to select a planetary gearbox · Gearboxes and harmonic drives
Often compared with
Engineers specifying this series often compare it with:
Other spiral bevel gearbox series
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