The R97 heavy duty gear reducer is a large-frame member of the WGT R series. Designed around a 97 mm centre distance, it delivers high torque on the machine axis while its helical gearing keeps efficiency high. Plants use it where a quiet, slow, high-torque gearbox must run for years with minimal attention - think thickeners, large agitators, blowers and quarry conveyors.
Frame Size and Construction
- Precision-machined cast-iron or ductile-iron housing, HBS190-240, one-setup boring for shaft alignment
- 20CrMnTi gears carburised to HRC58~62; 42CrMo shafts quenched and tempered to HRC25~30
- Noise 60~68 dB; vibration 20 μm or less; backlash 20 arcmin or less
- Lubrication: GB L-CKC220~460 or Shell Omala 220~460; NAK oil seals standard
- Mounting: foot, flange or shaft; M1-M6 positions; two- and three-stage builds
Technical Data Sheet
| 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 |
Industries that buy this model most often:
- Cement, lime and aggregate plants
- Food processing and packaging lines
- Extruders and plastics machinery
- Pumps, fans and blowers
- Paper, textile and light industry
Purchase Information
WGT supplies the R97 factory-direct with transparent EXW pricing and full pre-shipment test records. Standard lead time is 5-10 weeks; urgent orders can be prioritised. Every unit is guaranteed for one year, with seal and bearing spares available from stock, and interface dimensions matching the R97 frame family keep existing couplings and foundations in place. Share your ratio, torque and mounting data for a same-day quotation and drawing package.
Available Frames and Their Typical Duty
| Model | Centre distance | Output | Typical duty |
|---|
| R97 | 97 mm | solid shaft, foot | thickeners, blowers |
| R17 | 17 mm | solid shaft, foot | small conveyors, dosing screws |
| R27 | 27 mm | solid shaft, foot | packaging, light agitators |
| R37 | 37 mm | solid shaft, foot | belt conveyors, small mixers |
| R47 | 47 mm | solid shaft, foot | screw conveyors, feeders |
| R57 | 57 mm | solid shaft, foot | mixers, aeration blowers |
| R67 | 67 mm | solid shaft, foot | mixers, extruders |
| R77 | 77 mm | solid shaft, foot | extruders, heavy conveyors |
| R87 | 87 mm | solid shaft, foot | screw conveyors, agitators |
| R107 | 107 mm | solid shaft, foot | aerators, heavy conveyors |
| R137 | 137 mm | solid shaft, foot | mill drives, large hoists |
| R147 | 147 mm | solid shaft, foot | mill drives, heavy hoists |
| R167 | 167 mm | solid shaft, foot | heaviest inline drives |
Note that R and RF model numbers of the same frame size are fully interchangeable in terms of gearing; only the output interface and mounting differ. That keeps your stock of spare internals small.
Questions and Answers
What payment terms do you accept?
We normally work on 30% deposit and 70% against the bill-of-lading copy for sea freight, or 100% before dispatch for small orders. Other terms can be discussed for framework or repeat business.
Can you manufacture a custom ratio or a special shaft?
Beyond the catalogue ratios we can quote special ratios and custom output shafts - splined, extended, special keyways or drilled - for OEM volumes. Tooling is amortised across the order, so unit cost falls as quantity rises.
What is the maximum overhung load on the output shaft?
The permissible overhung load depends on frame size, output speed and the distance from the shaft shoulder - all listed in the catalogue. If you drive a chain sprocket or V-belt pulley direct on the output shaft, send us the load and pitch diameter and we will confirm the limit.
Installation Examples
Stacker-reclaimer travel drive
A bulk terminal drives the travel gear of a stacker-reclaimer with units. Long-travel duty with frequent direction changes is smoothed by the ground gearing, and backlash stays within 20 arcmin over the full rail length.
Automatic parking system
A parking equipment manufacturer uses reducers on its puzzle-type car stackers. The hollow shaft takes the drive axle directly, and the quiet 60-68 dB operation suits installations inside residential buildings.
![gear box application map for industry]()
From quarries to food plants - one right-angle drive concept.
Selection Example: Cooling-tower fan drive
Take a 15 kW motor at 960 rpm turning a fan at 24 rpm. The ratio follows directly: 960 / 24 = 40, so i=40 is chosen. In this case quiet running at 60~68 dB suits installations near occupied buildings. The ratio is the easy part. The service factor for the shock level is what makes the selection safe, and we check that for you at no charge.
![how to choose a speed reducer model]()
Ratio first, then torque, then frame size: the standard selection route.
Design Review, Datasheet and Price - Same Day
Planning a new machine? The WGT Motor & Gearbox Online Selection System covers motor power, ratio and mounting on one screen - enter your numbers and see the model immediately.
Send the interface drawing or the frame dimensions you need to match, and we return a 2D drawing and 3D STEP model with the quotation, so your design review is not held up waiting on the supplier. Looking for a gearbox for crusher? Tell us the duty point and we will confirm the model in writing.
