Heli Worm Gearbox
What is a S-series Heli Worm Gearbox?
The Heli Worm Gearbox-also known as the S-series helical-worm right-angle gear reducer-is a commonly used industrial component for 90-degree power transmission and directional changes. Featuring a perpendicular layout between the input and output shafts, it is specifically designed to meet operational needs where space is limited and power transmission requires a change in direction. As a modular unit with hardened gear surfaces, it is widely adopted in automation production lines both domestically and internationally.





Common models
AS Series - Foot-mounted
ASF Series – Flange-mounted
ASA Series- Hollow shaft
ASAF Series – B5 Flange-mounted with hollow shaft
Optional models
ASH Series – Hollow shaft and shrink disk
ASHF Series – B5 Flange-mounted with hollow shaft and shrink disk
ASAZ Series – B14 Flange-mounted with hollow shaft
ASHZ Series – B14 Flange-mounted with hollow shaft and shrink disk

| Model | Output Shaft Dia. (mm) | Power | Ratio | Max. Torque | |
| Solid Shaft | Hollow Shaft | (kW) | (i) | (Nm) | |
| S37 | 20mm | 20mm | 0.18~0.75 | 10.27~152 | 90 |
| S47 | 25mm | 25/30mm | 0.18~1.5 | 11.46~244.74 | 170 |
| S57 | 30mm | 30/35mm | 0.18~3 | 10.78~196.21 | 295 |
| S67 | 35mm | 40/45mm | 0.25~5.5 | 11.55~22 | 520 |
| S77 | 45mm | 50/60mm | 0.55~7.5 | 9.96~241.09 | 1270 |
| S87 | 60mm | 60/70mm | 0.75~15 | 11.83~222 | 2280 |
| S97 | 70mm | 70/90mm | 1.5~22 | 12.75~230.48 | 4000 |

90-degree right-angle redirection saves installation space.
With a vertical input-output layout, the unit allows for compact equipment arrangement and easy installation in tight spaces, such as on assembly lines or within machine frames.
Low operating noise and minimal vibration.
Precision-meshed helical gears combined with a vibration-absorbing cast-iron housing ensure quieter operation than standard worm gear reducers, making them ideal for noise-sensitive workshop environments.
Built-in self-locking function prevents back-driving when stopped.
The worm gear drive offers inherent self-locking capabilities; lifting and conveying equipment will not slip or drift when stopped, eliminating the need for an additional brake.
Compound Drive Structure
The speed reducer employs a two-stage compound drive system combining helical gears and a worm gear set. The first stage utilizes helical gears to achieve initial speed reduction and torque multiplication, while the second stage uses a worm gear set to execute a 90-degree output turn. This design balances transmission efficiency with right-angle redirection; unlike single-stage worm gear reducers, it offers superior torque-bearing capacity.


| Model | S series Heli Worm Gearbox |
| Input power | 0.12kW~22kW |
| Altitude | 1000 m |
| Max rated torque | Up to 4200Nm |
| Efficiency | ≦91% |
| Input type | Flange, motor, solid shaft |
| Warranty | 12 month / 1 year |





























Q1: How to choose between the S-series right-angle gear reducer and the K-series bevel gear reducer?
A1: For applications requiring self-locking, a moderate budget, and low speed/low power: choose the S-series helical-worm right-angle gear reducer. For high-speed, high-power applications involving long-term, continuous full-load operation where self-locking is not required: prioritize the K-series helical-bevel gear reducer.
Q2: Can S-series gear reducers rotate in reverse?
A2: It supports normal bidirectional operation (forward and reverse); however, the reverse direction features a self-locking limit function that prevents free rotation, thereby enhancing the safety of the lifting equipment.
Q3: Can it directly replace an imported SEW right-angle gear reducer of the same specifications?
A3: The S Series adheres to international IEC modular standards, featuring universal mounting dimensions and flange interfaces that allow for direct unit-for-unit replacement without requiring modifications to the mounting frame.
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