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.

■ Certifié ISO 9001:2000

Chaque unité est fabriquée selon la norme de gestion de la qualité ISO 9001:2000. L'inspection des matières premières, les contrôles en cours de production et les tests finaux sont tous documentés et traçables grâce au numéro de série de chaque unité.

Marquage CE — Directive européenne 2006/42/CE relative aux machines

La conformité totale aux normes CE confirme le respect des normes européennes de sécurité et de conception pour la transmission de puissance mécanique, favorisant ainsi l'exportation vers les marchés de l'UE, du Royaume-Uni, de l'Australie et de la Nouvelle-Zélande.

■ Tests avant expédition : bruit, fuite, couple

Chaque unité subit trois tests avant expédition : niveau sonore inférieur à 68 dB(A) à charge nominale, test d’étanchéité sous pression de 30 minutes et transmission du couple à ±5% de la valeur nominale. Les unités non conformes sont remises en état et ne sont pas expédiées.

■ Certification des matériaux FC20+

Les pièces moulées des carters sont vérifiées par des certificats d'usine pour la nuance FC20 : résistance à la traction minimale de 220 MPa, dureté de 160 à 200 HB. Un contrôle par ultrasons des défauts est effectué sur les pièces de taille 135 et supérieure.

“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.”