The K37 helical bevel gear reducer is the smallest frame in the WGT K series - a right-angle gearbox that pairs a helical input stage with a bevel output stage to turn the drive through 90 degrees. Where a worm unit trades efficiency for a compact right angle, the K37 keeps losses low, so motor sizing and running cost stay down. Its 37 mm centre distance and foot-mounted cast-iron housing give it standard interface dimensions that match the K37 frame family.
Design Highlights of the K37
- Right-angle helical-bevel layout - 90 degree output without the losses of a worm drive
- Cast-iron / ductile-iron housing, HBS190-240, machined in one setup for true shaft alignment
- Case-hardened 20CrMnTi gears, ground to precision grade 6~5, running at 60~68 dB
- 42CrMo input and output shafts, quenched and tempered to HRC25~30
- Foot mounting with solid shaft; flange, hollow-shaft and torque-arm variants share the same frame
Technical Data
| 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, cementit-ing, quenching, etc. |
| Efficiency | 94%~96% (depends on the transmission stage) |
| Noise (max) | 60~ 68dB |
| Temp. rise (max) | 40°C |
| Temp. rise (oil) (max) | 5 0°C |
| Vibration | ≤20μm |
| 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 |
Main fields of application:
- Paper and light industry
- Chemical and environmental protection plants
- Conveyors, mixers, agitators and crushers
- Hoist and transport equipment
- Cement and construction machinery
Ordering the K37 from WGT?
Every K37 gear reducer is built on the same tooling as the standard production line and inspected against the frame drawings before dispatch. Units leave the plant with a one-year warranty, an installation manual and a test record covering noise, temperature rise and backlash. Send us the ratio and output speed you need, or a photo of the existing nameplate, and we answer with a firm quotation and delivery date within 24 hours.
Selection Example: Carton sealing conveyor
Take a 1.1 kW four-pole motor (1400 rpm) on a sealing conveyor that must run at 35 rpm. The ratio follows directly: 1400 / 35 = 40, so i=40 is selected. In this case the 37 mm right-angle frame keeps the sealing head drive out of the operator aisle. The same three numbers - motor speed, target output speed, required torque - are all you need; our engineers (or the online selector below) cross-check the service factor for your duty cycle.
![gear reducer selection flow chart - ratio and frame size]()
Figure: from motor data to a confirmed gearbox model in four steps.
Common Models in the K Series
| Model | Centre distance | Output | Typical duty |
|---|
| K37 | 37 mm | solid shaft, foot | small conveyors, hoists |
| K47 | 47 mm | solid shaft, foot | packaging, agitators |
| K57 | 57 mm | solid shaft, foot | belt conveyors, mixers |
| K67 | 67 mm | solid shaft, foot | mixers, feeders, hoists |
| K77 | 77 mm | solid shaft, foot | turntables, elevators |
| K87 | 87 mm | solid shaft, foot | screw conveyors, washers |
| K97 | 97 mm | solid shaft, foot | thickeners, heavy conveyors |
| K107 | 107 mm | solid shaft, foot | heavy material handling |
| K157 | 157 mm | solid shaft, foot | mill drives, large hoists |
| K167 | 167 mm | solid shaft, foot | heaviest right-angle drives |
The table below lists the foot-mounted K frames; naming makes selection easy: K = foot-mounted solid shaft, KA = hollow shaft, KF = flanged, KAF = flange with hollow shaft - all sharing the same gear set and centre distance as the K foot model.
Application Cases
Stone quarry conveyor
A stone quarry runs reducers on its primary conveyor. Shock loads from oversized rock are absorbed by the case-hardened gears (surface HRC58-62), and after two years of continuous duty the units still run within their original 68 dB noise spec.
Flour mill screw conveyors
A flour mill standardised on gear reducers for its screw conveyor network. One spare-part pool now covers fifteen drives, and the smooth helical input stage keeps noise low in the packing hall.
![industrial gearbox applications - conveyor mixer crusher wastewater]()
Figure: typical industries that use the WGT S-series gear reducers.
Frequently Asked Questions
Can this unit mount on my existing installation without redesign?
Yes - the series is manufactured to the same centre distances, shafts and flange dimensions of the common industry frames, so couplings, guards and foundations stay untouched.
Which lubricating oil should be used?
GB L-CKC220~460 or Shell Omala 220~460 as supplied. Under normal duty the housing is lubricated for life; in hot or continuous-duty environments an oil change after the first 400 hours and then every 4000 hours is recommended.
What warranty and documentation come with the gearbox?
A one-year warranty covers material and workmanship. Each unit ships with a test record (noise, temperature rise, backlash), a dimension drawing and an installation manual.
Get Your Drawing and Quotation within 24 Hours
Ready to size your drive? Not sure which model fits? Try our online WGT Motor & Gearbox Online Selection System to match motor power, ratio and mounting in one minute.
Or simply send your motor data (kW, speed, duty) and driven-machine details through the inquiry button - we reply with a completed datasheet, dimension drawing and factory price the same working day. Looking for a gearbox for belt conveyor? Tell us the duty point and we will confirm the model in writing.
