WPKA Single Speed Cast Iron Worm Reducer — WP Series

Conventional solid-output worm reducers require a shaft coupling between the reducer and the driven equipment — adding installation time, alignment risk, and ongoing coupling maintenance. The WPKA eliminates all three: its K-type hollow bore slides directly over the driven shaft and locks via key and keyway, creating a rigid, zero-coupling drive in a single assembly step.

This clean mechanical integration makes the WPKA the standard choice for shaft-mounted conveyor head drives, mixer agitators, and rotating platform drives across mining, chemical processing, and bulk handling industries. The same FC20+ cast iron housing as the solid-output WPA ensures identical vibration damping and thermal performance — the hollow bore does not compromise structural rigidity.

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■ K-Type Through-Bore — Zero Coupling Hardware

The H7-tolerance through-bore with GB/T 1095 keyway accepts the driven shaft directly. Rigid keyed connection transmits full rated torque without coupling elements — no coupling lubrication schedule, no coupling fatigue failure risk.

■ Bore Diameters 18.8–90 mm Across 12 Sizes

From 18.8 mm (size 40) for small conveyor stub shafts to 90 mm (size 250) for large agitator main shafts — covering the complete range of standard industrial shaft diameters in a single product series.

■ Torque Arm Boss — Housing Rotation Prevented

A machined torque arm boss on the housing accepts a standard reaction arm to prevent housing rotation when shaft-mounted. Multiple anchor point orientations accommodate varied installation geometries.

■ FC20+ Cast Iron — Full Structural Integrity Retained

The hollow output bore does not reduce housing rigidity. The WPKA retains the same FC20+ cast iron construction as the solid-output WPA, with identical 95°C continuous oil temperature rating.

■ Double-Lip Oil Seal on Both Bore Ends

Seals on both sides of the hollow bore prevent lubricant leakage onto the driven shaft and block contaminant ingress into the gear mesh — critical in food processing and chemical environments.

■ Bilateral Solid Input Shaft Maintained

Despite the hollow output bore, the input remains a standard solid shaft with bilateral connection, maintaining full WPA-series motor mounting compatibility.

⚊ Shaft-Mounted Conveyor Head Drives

The WPKA slides onto the conveyor head shaft, eliminating the external coupling and shaft-to-shaft alignment that accounts for a large share of conveyor drive maintenance issues. The torque arm handles the housing restraint.

☵ Agitator & Mixer Drives

Vessel agitator shafts drop straight through the WPKA hollow bore. No exposed coupling in corrosive process environments means no coupling fatigue failures and no coupling lubrication maintenance.

⚒ Bucket Elevator Head Drives

The shaft-mount configuration handles the sustained radial loads of bucket elevator drives better than solid-output units with external couplings that introduce additional bending moments on the shaft.

⚛ Fan & Blower Drives

Industrial fan shafts mount directly into the WPKA bore, removing coupling hub mass from the shaft overhang and improving dynamic balance in high-speed fan applications.

■ ISO 9001:2000 Certified

Every unit is manufactured under ISO 9001:2000 quality management. Raw material inspection, in-process checks, and final testing are all documented and traceable to each unit’s serial number.

■ CE Marking — EU Machinery Directive 2006/42/EC

Full CE compliance confirms adherence to European safety and design standards for mechanical power transmission, supporting export to EU, UK, Australian, and New Zealand markets.

■ Pre-Shipment Testing: Noise, Leak, Torque

Every unit passes three tests before shipping: noise below 68 dB(A) at rated load, 30-minute pressurisation leak test, and torque transmission within ±5% of rated value. Non-conforming units are reworked — not shipped.

■ FC20+ Material Certification

Housing castings are verified by mill certificates for FC20 grade: minimum 220 MPa tensile strength, 160–200 HB hardness. Ultrasonic defect testing is performed on size 135 and above.

“Replaced all belt conveyor head drives with WPKA shaft-mount units at our mine. Eliminated coupling failures entirely — zero drive-related stoppages in two years. Hollow bore installation takes 20 minutes per unit.”

“WPKA drives our reactor agitator shafts. Hollow bore goes straight onto the agitator shaft — no coupling exposed to our corrosive process atmosphere. Zero leaks after 36 months continuous operation.”

“Used WPKA-135 on bucket elevator head drives. Shaft-mount design reduced installed drive height by 180 mm versus solid-output unit plus coupling. Significant clearance improvement.”

“WPKA on steriliser cage conveyor in a wet steam environment. Cast iron durability outlasted the aluminium hollow-shaft units we previously used. Would appreciate Viton seal option as standard on these sizes.”