English
Supply capacity: 600 sets/month Delivery time: 5-10 weeks Packing: Standard export wooden crate Port: NINGBO / SHANGHAI PORT Warranty: one year
When a drive needs more muscle than the small RX frames can give, the RX87 helical gearbox steps in: 87 mm centre distance, robust 42CrMo shafts and a housing section designed for continuous load. The unit follows the standard interface dimensions of the RX87 frame family and is widely used on screw conveyors, industrial washers, agitators and water-treatment scrapers.
Helical teeth in rolling contact keep losses low and heat generation modest, which is what lets the RX87 run long shifts without an oil cooler. Surface hardness reaches HRC58~62 over a ductile HRC33~40 core; the maximum temperature rise is 40 C on the housing and 50 C on the oil, both verified in factory run-in tests.
| 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 |
Selected application examples:
Specify ratio, output speed, mounting position (M1-M6) and shaft direction; WGT returns a selection confirmation with torque limits and a firm price. Sampling units for OEM validation are welcome. Production lead time is normally 5-10 weeks with sea or air freight from NINGBO / SHANGHAI, and all RX87 gear reducers carry a one-year warranty and lifetime technical support.
| Model | Centre distance | Output | Typical duty |
|---|---|---|---|
| RX87 | 87 mm | solid shaft, foot | screw conveyors, agitators |
| 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 |
| RX97 | 97 mm | solid shaft, foot | thickeners, blowers |
| RX107 | 107 mm | solid shaft, foot | aerators, heavy conveyors |
| RX127 | 127 mm | solid shaft, foot | mill drives, large hoists |
| RX157 | 157 mm | solid shaft, foot | heaviest inline drives |
Frame numbers follow the centre distance. Mounting variants do not change performance: foot, flanged and shaft-mounted versions of a given frame all use identical gearing and the same internal parts.
An environmental-equipment plant uses reducers on the rotary valve feeders of its dust-extraction systems. Compact size, quiet running and food-grade oil options made the approval easy.
On the run-out table of a small steel mill, units handle the repeated starts and stops of hot billet handling. The 42CrMo output shafts tolerate the thermal cycling, and torque-arm mounting keeps the drive clear of the roller frames.
Conveyor, mixer, crusher and wastewater duties share the same gear family.
Take a 7.5 kW motor at 960 rpm turning a wash drum at 16 rpm. The ratio follows directly: 960 / 16 = 60, so i=60 is chosen. In this case the 87 mm frame shrugs off the reversing load of the wash cycle. Motor speed over target speed gives the ratio; the driven machine decides the service factor, and the two together decide the model.
The four inputs the online selector asks for.
Not sure where to start? Work out the ratio, torque and frame size yourself with the WGT Motor & Gearbox Online Selection System, then send the result - we confirm it in writing.
A photo of the nameplate, the motor power and the output speed you need are enough to start. We confirm the frame size, ratio and mounting style and return a written quotation the same day. Looking for a speed reducer for bucket elevator? Tell us the duty point and we will confirm the model in writing.
Backlash is the small free rotation between input and output. We hold it within 20 arcmin - tight enough for indexing tables, positioning drives and reversing applications, without the cost of a precision servo gearbox.
We can supply food-grade lubricant, FKM (Viton) oil seals and stainless fasteners for washdown areas. These units are common in bakeries, dairies and packaging halls where hygiene and moisture are daily concerns.
Packing: Standard export wooden crate Port: NINGBO / SHANGHAI PORT Supply capacity: 600 sets/month Warranty: one year Delivery time: 5-10 weeks
Delivery time: 5-10 weeks Warranty: one year Supply capacity: 600 sets/month Port: NINGBO / SHANGHAI PORT Packing: Standard export wooden crate
Packing: Standard export wooden crate Port: NINGBO / SHANGHAI PORT Supply capacity: 600 sets/month Warranty: one year Delivery time: 5-10 weeks
Delivery time: 5-10 weeks Warranty: one year Supply capacity: 600 sets/month Port: NINGBO / SHANGHAI PORT Packing: Standard export wooden crate
Packing: Standard export wooden crate Port: NINGBO / SHANGHAI PORT Supply capacity: 600 sets/month Warranty: one year Delivery time: 5-10 weeks
Delivery time: 5-10 weeks Warranty: one year Supply capacity: 600 sets/month Port: NINGBO / SHANGHAI PORT Packing: Standard export wooden crate
Supply capacity: 600 sets/month Delivery time: 5-10 weeks Packing: Standard export wooden crate Port: NINGBO / SHANGHAI PORT Warranty: one year
Packing: Standard export wooden crate Port: NINGBO / SHANGHAI PORT Supply capacity: 600 sets/month Warranty: one year Delivery time: 5-10 weeks
Founded in 1988, WGT Weigao Transmission is a professional R&D and manufacturing enterprise of gearboxes, reducers, motors and generator sets, and a member of the China Industrial Machinery Transmission Industry Association. With over 30 years of industry experience, we focus on technological innovation and strict quality control, delivering reliable transmission products and solutions for global industrial customers.
