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WPKS Hollow Shaft Single Speed Worm Gear Reducer with Cooling Fins — Thermally Stable Direct-Mount Drive for Food, Beverage & Packaging Lines
Food and beverage production lines present two simultaneous gearbox challenges: the need for a clean, coupling-free drive connection that simplifies machine hygiene and maintenance, and the thermal demands of continuous high-frequency operation in warm production environments. The WPKS hollow shaft worm gear reducer addresses both challenges simultaneously — delivering the installation simplicity of a direct shaft-mount hollow bore combined with the enhanced thermal performance of an integral cooling fin array.
The WPKS maintains oil temperatures up to 15°C lower than the smooth-body WPKA at equivalent load — extending lubricant service life, reducing seal wear, and ensuring reliable continuous operation during long production shifts. Available in 12 frame sizes (40–250 mm) with ratios 1/5 to 1/60 and an H7 precision hollow bore for coupling-free shaft mounting. เกี่ยวกับเอเวอร์พาวเวอร์ | ขอใบเสนอราคา
Technical Specifications
WPKS shares the WPKA base footprint with increased housing height (HL) due to the integral cooling fins. S = hollow bore diameter; W×Y = bore keyway. All dimensions in mm; reference input speed 1500 r/min.
| Size | Ratio | เอ | AB | B | CC | H | HL | M | N | E | F | G | Z | HS | U | T×V | S(bore) | W×Y(keyway) | Wt(kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 40 | 1/5–1/60 | 143 | 87 | 85 | 40 | 141 | 60 | 90 | 100 | 70 | 80 | 13 | 10 | 25 | 12 | 4×2.5 | 16 | 6×18.8 | 4 |
| 50 | 175 | 108 | 105 | 50 | 180 | 80 | 120 | 140 | 95 | 110 | 15 | 12 | 30 | 12 | 4×2.5 | 20 | 6×22.8 | 7 | |
| 60 | 198 | 120 | 110 | 60 | 207 | 90 | 130 | 150 | 105 | 120 | 20 | 11 | 40 | 15 | 5×3 | 25 | 8×28.3 | 10.5 | |
| 70 | 231 | 140 | 130 | 70 | 238 | 105 | 150 | 190 | 115 | 150 | 20 | 15 | 40 | 18 | 5×3 | 30 | 8×33.3 | 14.5 | |
| 80 | 261 | 160 | 150 | 80 | 270 | 120 | 170 | 220 | 135 | 180 | 20 | 15 | 50 | 22 | 7×4 | 35 | 10×38.3 | 22 | |
| 100 | 322 | 190 | 160 | 100 | 331 | 150 | 193 | 270 | 155 | 220 | 25 | 15 | 50 | 25 | 7×4 | 40 | 12×43.3 | 36 | |
| 120 | 371 | 219 | 175 | 120 | 423 | 180 | 233 | 320 | 180 | 260 | 30 | 18 | 65 | 30 | 7×4 | 45 | 14×48.8 | 63 | |
| 135 | 422 | 249 | 210 | 135 | 482 | 215 | 253 | 350 | 200 | 290 | 30 | 18 | 75 | 35 | 10×4.5 | 60 | 18×64.4 | 80 | |
| 155 | 497 | 295 | 256 | 155 | 541 | 235 | 275 | 390 | 220 | 320 | 35 | 21 | 85 | 40 | 12×5 | 70 | 20×74.9 | 114 | |
| 175 | 534 | 314 | 282 | 175 | 600 | 260 | 310 | 430 | 250 | 350 | 40 | 20 | 85 | 45 | 14×5.5 | 80 | 22×85.4 | 150 | |
| 200 | 580 | 342 | 320 | 200 | 677 | 290 | 360 | 480 | 290 | 390 | 40 | 22 | 95 | 50 | 14×5.5 | 85 | 22×90.4 | 218 | |
| 250 | 705 | 420 | 400 | 250 | 824 | 350 | 460 | 560 | 380 | 480 | 45 | 28 | 110 | 60 | 18×7 | 110 | 28×90 | 365 |
* HL = total height including cooling fin array. WPKS shares the identical base footprint (A, B, CC) with WPKA — it is a thermal upgrade with the same hollow bore dimensions.
Product Structure — Hollow Bore + Integral Fin System
The WPKS integrates three distinct engineering features: an H7 precision hollow output bore with keyway, an integral longitudinal fin array on the housing top and side faces, and the proven FC25 grey cast iron body carrying the worm gear set. The fins and bore are both integral to the casting — no secondary bonding or bolt-on components — ensuring permanent performance and vibration resistance.
| Output Bore | H7 precision hollow bore with keyway — 16 mm (size 40) to 110 mm (size 250) |
| ครีบระบายความร้อน | Cast-integral longitudinal fins; up to +40% surface area vs WPKA; ~15°C temperature reduction |
| Housing | FC25 grey cast iron; same base footprint as WPKA — direct thermal upgrade |
| Input Shaft | Solid shaft with keyway; 5 direction positions (A–E) |
| Lubrication | Splash oil bath; N220–N460 mineral or PG synthetic |
| Bore Retention | Set screw standard; shrink disc optional for heavy or reversing loads |
✅ Key Features & Benefits
Dual Benefit: Hollow Bore + Thermal Fins
The WPKS is the only unit in the WP series combining hollow shaft coupling-free output with integral cooling fins. This dual specification delivers both machine simplification (no coupling) and thermal resilience (lower sustained temperature) in a single gearbox — eliminating two separate engineering compromises simultaneously. Keywords: hollow shaft worm gearbox with cooling, thermally stable hollow bore reducer.
Coupling-Free H7 Direct Shaft Mount
The precision H7 hollow bore mates directly to a driven shaft ground to h6/js6 tolerance. No coupling, no hub, no alignment tooling required. For packaging and food processing OEMs, this reduces machine assembly time and eliminates the coupling maintenance call that interrupts high-value production runs.
~15°C Lower Operating Temperature
Integral longitudinal fins increase external surface area by up to 40% vs the WPKA, reducing sustained oil sump temperature by approximately 15°C under equivalent load. In food production environments where ambient temperatures can reach 30–35°C, this thermal margin ensures the gearbox stays well within its 95°C maximum oil temperature limit across full production shifts.
Same Footprint as WPKA — Direct Thermal Upgrade
The WPKS shares the identical base footprint and bore dimensions with the WPKA. Where an existing WPKA installation is experiencing thermal issues in a food or packaging environment, the WPKS is a direct thermal upgrade with no mounting plate or shaft modification required. Verify the increased HL height clears the machine structure before ordering.
Precision Worm Pair — Quiet, Efficient Transmission
Ground 20CrMnTi worm and ZCuSn10Pb1 bronze wheel to ISO 1328 Grade 7 tolerances deliver ≤72 dB(A) noise — important in food production facilities with operator noise regulations. Efficiency of 60–90% per ratio ensures competitive energy costs across continuous production runs.
12 Frame Sizes, Full Ratio Range
Bore diameters from 16 mm (size 40) to 110 mm (size 250), with nine ratios (1/5–1/60), cover the driven shaft sizes and speed requirements found across the full range of food, beverage, and packaging processing equipment.
การประยุกต์ใช้ในอุตสาหกรรม
The WPKS is specified for food, beverage, and packaging applications requiring both direct shaft mounting and thermal resilience during continuous production:
Beverage Bottling LinesBottle washer conveyor drives, filling carousel auxiliaries, and labelling machine feed systems where continuous high-speed operation in warm, humid environments requires thermally stable hollow shaft drives.
Bakery & Food ProcessingDough feeder screw drives, conveyor oven band drives, and portioning machine feed shafts where the hollow bore mounts directly onto process equipment shafts in environments with ambient temperatures up to 40°C.
เครื่องจักรบรรจุภัณฑ์Carton erector conveyor drives, form-fill-seal machine feed rollers, and palletiser conveyor drives requiring coupling-free, thermally stable drive units with long service intervals.
Dairy & Liquid FoodCream separator auxiliaries, mixer vessel drives, and filling line conveyors in dairy plants where production runs may span 16–20 hours and thermal stability is essential to avoid unexpected stops.
Cosmetics ManufacturingHigh-capacity mixing vessel drives and blending machine feed shafts in cosmetics factories that run multiple shifts in warm, enclosed production rooms.
Brewing & WinemakingWort transfer pump auxiliaries, rotary drum dryer drives, and bottle conveyor systems in breweries and wineries requiring reliable drive units that maintain thermal stability during continuous seasonal production.
Quality Control & Certification
ISO 9001:2015 & CE
Full ISO 9001:2015 QMS with CE Declaration of Conformity per shipment. Hollow bore verified to H7 tolerance by calibrated plug gauge at final inspection. CE compliance covers EU Machinery Directive 2006/42/EC and Australian market requirements.
️ Thermal Run + Bore Test
Each WPKS undergoes a 60-minute thermal stability run at 110% rated torque, verifying oil sump temperature stabilises below 95°C. The hollow bore is subsequently measured for roundness and keyway position to confirm no thermal distortion during the run test.
Material Standards
Housing: FC25 cast iron (≥250 MPa). Worm: 20CrMnTi (≥58 HRC). Wheel: ZCuSn10Pb1 tin-bronze. All materials traceable; food-grade lubricant compatibility confirmed on request for food contact machinery documentation.
Why Choose Ever-power for WPKS Gearboxes
We supply WPKS hollow shaft finned gearboxes to food processing OEMs, packaging machinery builders, and beverage equipment manufacturers in Italy, the USA, Saudi Arabia, Australia, and beyond. Our in-house hollow bore grinding and fin casting capabilities allow us to maintain dimensional consistency and thermal performance across large OEM supply programmes.
- ✅ H7 bore + thermal run test — two-in-one quality verification at final inspection
- ✅ Food-grade lubricant compatibility confirmed for USDA/FDA machine documentation
- ✅ Custom bore diameters available for non-standard shaft sizes
- ✅ Shrink-disc output option for high-torque continuous production drives
- ✅ Rapid delivery — stock maintained across key sizes, 7–15 working day lead time
⭐ Customer Reviews
“We upgraded our bottle washer conveyor drives from WPKA to WPKS after experiencing oil temperature issues during peak summer production. The difference is significant — the WPKS runs 13°C cooler on the same duty cycle. The hollow bore dimensions are identical, so it was a completely painless swap.”
Rachel T., Process Engineer
Beverage Bottling Line OEM, Melbourne, Australia
“We use WPKS-80 and WPKS-100 on our continuous pasta processing lines. The combination of hollow bore direct mounting and cooling fins is exactly what we need for 20-hour production runs at 30°C ambient. Excellent build quality, consistent bore dimensions, and reliable delivery from Ever-power.”
Giovanni F., Design Engineer
Food Processing Equipment, Milan, Italy
“We specified WPKS for our form-fill-seal machine conveyor drives after our engineering team calculated that the WPKA would be borderline on temperature in the sealed cabinet environment. The WPKS gives us comfortable thermal headroom. Clean H7 bore, correct keyway position, zero rejects across three batches.”
Nate J., Applications Engineer
Packaging Systems OEM, Wisconsin, USA
“WPKS gearboxes for bakery conveyor drives in Saudi Arabia — ambient temperatures regularly exceed 40°C and the lines run 20+ hours per day. The cooling fins genuinely make a difference here. Quality is consistent and the technical support team confirmed lubricant selection for our high-temperature conditions.”
Tariq A., Procurement Manager
Food Equipment Supplier, Jeddah, Saudi Arabia
❓ Frequently Asked Questions
What is the difference between WPKS and WPKA?
The WPKS and WPKA are identical in base footprint, hollow bore diameter (S), keyway dimensions, input shaft dimensions, and torque ratings. The sole difference is the housing height: the WPKS has a taller body with integral cooling fins (higher HL dimension) that provides approximately 15°C lower sustained oil temperature. Choose WPKA for standard duty; choose WPKS for continuous, high-duty-cycle, or high-ambient-temperature applications.
Is the WPKS suitable for food-grade or washdown environments?
The standard WPKS with grey cast iron housing and NBR seals is not rated for high-pressure washdown or direct food-contact applications. For food-grade applications, we recommend using a food-safe lubricant (e.g. NSF H1 registered oil) and requesting an epoxy-coated housing option which prevents corrosion from occasional water contact. For full washdown, contact us about stainless steel output shaft and sealed breather options.
Can I replace an WPKA with a WPKS without machine modification?
In most cases yes — the WPKS shares the identical base footprint and bore dimensions with the WPKA. The only dimensional change is the increased housing height (HL) due to the cooling fins. Measure the available vertical clearance above your existing WPKA and compare to the WPKS HL value. If clearance is sufficient, it is a direct swap with no shaft or mounting changes needed.
What is the maximum bore diameter available for the WPKS?
The largest standard WPKS bore is 110 mm for size 250. For size 200, it is 85 mm; for size 175, it is 80 mm. Custom bore diameters between standard sizes are available for OEM orders. If your driven shaft diameter is 95 mm, for example, we can bore the size 200 WPKS to 95 mm H7 tolerance — contact us for a quotation.
Does the cooling fin array need any special maintenance?
For standard industrial environments, no special maintenance is required. In dusty environments (grain processing, animal feed, cement), inspect the fin channels annually and clean with compressed air if dust accumulation is visible — blocked fins reduce thermal performance. In food production environments with steam or condensation, ensure the fin channels drain freely and do not accumulate water that could promote corrosion.
Thermally Stable Hollow Shaft Drive for Your Production Line
If your food or packaging line needs coupling-free direct shaft mounting combined with reliable thermal performance across full production shifts, the WPKS delivers both. Request a bore compatibility check and fast quotation today.
