The WPES elongated two-stage housing features cast-integral longitudinal fins on the top and outer side faces — the faces with the highest natural convection exposure in a foot-mounted installation. Both worm gear stages share the single oil bath, and the expanded fin array ensures that heat generated by both gear meshes can be dissipated by natural convection without exceeding the 95°C maximum sump temperature limit even in 40°C+ ambient conditions.

Solves the Two-Stage Heat Problem

Two gear meshes means two sources of friction heat in one housing. The WPES fin array is sized to dissipate the combined thermal output of both worm pairs at rated load, preventing the cumulative heating that causes premature lubricant degradation and seal failure in smooth-body two-stage units. Keywords: thermally stable two-stage worm gearbox, double speed reducer with cooling.

~18°C Lower Temperature vs WPEA

At rated load and 40°C ambient, the WPES oil sump temperature is approximately 18°C lower than the equivalent WPEA — a greater differential than the ~15°C achieved by the WPS single-stage fin variant, because the WPES fins must manage dual-stage heat generation. This margin keeps the unit within the 95°C maximum limit even in hot cement, metallurgical, and outdoor environments.

Cast-Integral Fins — Permanent Performance

The cooling fins are cast as part of the housing in a single foundry pour, ensuring maximum thermal conductivity and permanent bond to the housing body. Unlike bolt-on heat sink accessories, there is no risk of fin loosening under the vibration and thermal cycling inherent in cement plant and mining environments.

Extended Lubricant Life in Two-Stage Applications

Two-stage worm units run hotter than single-stage equivalents at the same input power. The WPES fin array reduces this temperature excess, extending ISO VG 320 mineral oil drain intervals from the 2,500-hour standard up to 3,500–4,000 hours in many continuous applications — a meaningful reduction in maintenance intervention frequency for remote or difficult-to-access drives.

Drop-In Thermal Upgrade from WPEA

The WPES shares the identical base footprint, shaft dimensions, and shaft-direction options with the WPEA. Where an installed WPEA is experiencing overtemperature issues in a hot plant room, the WPES is the minimum-disruption upgrade — verify the available height clearance for the fin array (HL difference) and swap in place.

Five Shaft-Direction Options

Standard positions A through E provide full installation flexibility for the WPES in the demanding environments where it is most needed — mine drives, cement plants, and chemical process lines — without requiring angle-drive accessories.

Cement & Lime ProductionKiln slow drives, clinker conveyor drives, and raw mill auxiliaries in hot cement plants where the WPES handles dual-stage heat generation in ambient temperatures up to 50°C without supplemental cooling.

Metallurgy & Rolling MillsRolling mill main drive auxiliaries, bloom transfer table drives, and blast furnace charging equipment where continuous operation in high-ambient-temperature steel plant environments demands thermally stable two-stage drives.

Mining — Hot Climate ApplicationsUnderground mine conveyors in deep hot mines (West Africa, India, Australia) and surface mineral processing plants in desert environments where ambient temperatures regularly exceed 40°C.

Chemical Process — Continuous LinesContinuous stirred-tank reactor (CSTR) drives and large agitator systems in chemical plants operating at 90%+ duty cycle in enclosed, poorly-ventilated plant rooms.

24/7 Heavy Industrial ProcessesGlass furnace batch charger drives, rubber vulcanisation line auxiliaries, and any continuous industrial process operating three shifts per day where two-stage gearbox overheating has been a recurring maintenance issue.

Outdoor & Tropical ApplicationsIrrigation pump station drives, sugar mill conveyor drives, and biomass processing equipment in tropical and subtropical regions where outdoor ambient temperatures exceed 45°C during summer production periods.

ISO 9001:2015 & CE

Full ISO 9001:2015 QMS. CE Declaration of Conformity per shipment. Fin casting quality is inspected at the foundry stage — incomplete fin fill, voids, or geometric deviation from spec are grounds for rejection before any machining commences.

️ Dual-Stage Thermal Run Test

Each WPES undergoes a 90-minute thermal stability run at 110% rated torque with oil sump temperature measured at both gear stages. Temperature must stabilise below 95°C and the differential between the two stages must be within 8°C of each other, confirming that fin cooling is uniformly effective across the full two-stage housing length.

️ Material & Fin Standards

Housing: FC25 cast iron (≥250 MPa). Both worm shafts: 20CrMnTi (≥58 HRC). Wheel rims: ZCuSn10Pb1 tin-bronze. Fin pitch, height, and wall thickness verified against drawing spec. Third-party SGS/BV inspection available for cement, steel, and chemical industry quality audits.

We supply WPES thermally optimised two-stage worm gearboxes to cement OEMs, steel mill equipment builders, and chemical plant machinery manufacturers in the UK, Korea, India, Australia, and beyond. Our in-house foundry applies dedicated quality control for the WPES fin casting — fin geometry is verified at casting stage, not just after machining — ensuring consistent thermal performance across every unit.

• ✅ Foundry-stage fin geometry inspection — before machining, not after
• ✅ Dual-stage thermal run test as standard — 90-minute at 110% rated torque
• ✅ Thermal simulation capability — model your duty cycle and ambient temperature
• ✅ OEM supply for cement & steel OEMs — batch consistency across production programmes
• ✅ 20+ years export experience — UK, Korea, India, Australia and beyond

“We upgraded our kiln slow drive from WPEA to WPES after experiencing recurrent overtemperature trips during Queensland summer. The difference is substantial — the WPES runs 16°C cooler on the same duty cycle and we have had zero thermal trips in 14 months since the upgrade. The fin array on the two-stage housing is clearly doing its job.”

Patrick L., Drive Systems Engineer
Cement Works, Queensland, Australia

“We use WPES-100/155 units on our rolling mill auxiliary conveyor drives in a plant room where ambient temperatures regularly reach 48°C. The units run continuously three shifts per day and have been thermally stable throughout two years of operation. Oil change intervals have extended to 3,500 hours as our lubrication team predicted. Excellent product.”

Ian S., Maintenance Manager
Integrated Steel Works, South Wales, United Kingdom

“We operate continuous chemical process lines at near-100% duty cycle in enclosed plant rooms. The WPES-80/135 units on our heavy agitator drives have maintained stable sump temperatures through our hottest summer production season. The two-stage drive with fins is exactly the right combination for our application. Very satisfied with Ever-power quality and support.”

Park J., Senior Engineer
Chemical Process Plant, Ulsan, South Korea

“We use WPES gearboxes on our limestone crusher conveyor drives. Rajasthan summer temperatures exceed 45°C and our plant rooms are poorly ventilated. The finned two-stage units handle these conditions far better than our previous smooth-body units. One documentation delay on a batch order but resolved satisfactorily by Ever-power.”

Ramesh P., Plant Engineer
Limestone Processing Plant, Rajasthan, India