At the upper end of the mid RX range sits the RX127 helical gear reducer - a 127 mm centre-distance, all-helical unit built for the toughest continuous duties. Its large output bearings and ground gearing make it the natural choice for existing RX127 installations on thickeners, kiln drives, aerators and heavy material-handling systems.
The Large-Frame Answer
Because every stage is helical, the RX127 speed reducer stays efficient at high ratios where a worm unit would lose ground - and it runs cool enough for 24-hour duty without extra cooling. Keeping the drive on one axis also means the motor and gearbox share a single mounting face, which simplifies the baseplate and often cuts installed cost.
RX127 Ratings and Materials
| Housing material | Cast iron / ductile iron |
| Housing hardness | HBS190-240 |
| Gear material | 20CrMnTi alloy steel |
| Surface hardness of gears | HRC58~62 |
| Gear core hardness | HRC33~40 |
| Input / output shaft material | 42CrMo alloy steel |
| Input / output shaft hardness | HRC25~30 |
| Machining precision of gears | precision grinding, grade 6~5 (ISO 1328) |
| Lubricating oil | GB L-CKC220~460 / Shell Omala 220~460 |
| Heat treatment | tempering, carburising, quenching, etc. |
| Efficiency | 94%~96% (depends on the transmission stage) |
| Noise (max) | 60~68 dB |
| Temp. rise (max) | 40 C |
| Temp. rise (oil) (max) | 50 C |
| Vibration | ≤20 µm |
| Backlash | ≤20Arcmin |
| Brand of bearings | HRB/LYC/ZWZ/C&U (SKF, FAG, INA, NSK optional) |
| Brand of oil seal | NAK -- Taiwan or other brands requested |
Duties this frame size is regularly chosen for:
- Wastewater treatment and water supply
- Cement, lime and aggregate plants
- Paper, textile and light industry
- Extruders and plastics machinery
- Mining and bulk material handling
Ordering the RX127 from WGT
Send the driven-machine data - torque, ratio, duty cycle, ambient temperature - and WGT engineers confirm the RX127 selection and quote within one working day. Units ship in reinforced wooden crates via NINGBO or SHANGHAI with full test documentation. One-year warranty, worldwide spare-part support and OEM batch pricing are all available direct from the factory.
Selection Example: Quarry primary conveyor
Take a 37 kW motor at 980 rpm driving the conveyor at 24 rpm. The ratio follows directly: 980 / 24 = 40.8, so i=42 is selected. In this case the large frame absorbs the shock of a loaded belt start. Work through the same three steps - speed, output speed, torque - and the model number falls out; we verify it against the duty class before quoting.
![gear reducer ratio calculation steps]()
From duty point to model number - the same four steps every time.
Applications in Industry
Mining slurry pump drive
At a mineral processing site, hollow-shaft reducers drive slurry pump agitators. The hollow bore takes the pump shaft with no coupling, so a pump change-out no longer means re-aligning a separate drive.
Palm oil mill fruit elevator
A palm oil mill powers its fruit elevator with reducers. The humid, oily atmosphere is handled by FKM seals, and the compact frame fits between the steriliser and the threshing drum.
![gear reducer industries served - WGT]()
Industry map: the sectors where the RX series is most common.
Buyer Questions and Answers
What paint finish and corrosion protection is applied?
Housings are shot-blasted and finished with a two-component industrial paint in RAL colours, giving good protection for indoor and sheltered outdoor duty. For aggressive or coastal sites, ask for the heavy-duty coating option.
Do you supply spare parts such as seals and bearings?
Seal kits, bearings, output shafts and covers are available from stock or on short lead time. We keep the drawings for every unit we ship, so a replacement part ten years from now is still traceable to your original order.
RX Series Model Overview
| Model | Centre distance | Output | Typical duty |
|---|
| RX127 | 127 mm | solid shaft, foot | mill drives, large hoists |
| RX57 | 57 mm | solid shaft, foot | small conveyors, dosing screws |
| RX67 | 67 mm | solid shaft, foot | packaging, light mixers |
| RX77 | 77 mm | solid shaft, foot | mixers, extruders |
| RX87 | 87 mm | solid shaft, foot | screw conveyors, agitators |
| RX97 | 97 mm | solid shaft, foot | thickeners, blowers |
| RX107 | 107 mm | solid shaft, foot | aerators, heavy conveyors |
| RX157 | 157 mm | solid shaft, foot | heaviest inline drives |
The series is sized by centre distance rather than by motor power, so one frame can serve several motor sizes and ratios. The RX / RXF / RXS suffixes describe mounting and shaft style, not capacity.
Fast Quotation for OEM and Repeat Orders
Buying one unit or one hundred? Run your duty point through the WGT Motor & Gearbox Online Selection System first: it saves a round of emails and gets you to a firm price faster.
Single units ship on the same production route as batch orders, with no minimum-order surcharge. For OEM programmes we hold framework pricing and reserve capacity for your scheduled call-offs. Looking for a gear reducer for food processing machine? Tell us the duty point and we will confirm the model in writing.
