WPEKA Double Speed Cast Iron Worm Gearbox — WP Series

Shaft-mounted drives requiring ultra-high reduction ratios far beyond the 1/60 single-stage limit have traditionally needed either a two-gearbox cascade with intermediate coupling, or a custom planetary stage. The WPEKA Double Speed Cast Iron Worm Gearbox eliminates both: K-type hollow bore output (direct shaft mount, no coupling) combined with double-stage worm reduction (1/200–1/900) in one compact cast iron housing. The result is a shaft-mounted drive delivering output torques up to 6,050 Nm at speeds as low as 1.67 RPM, with zero coupling hardware on the output side.

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■ K Hollow Bore + Double-Stage: Shaft-Mount Extreme-Ratio Solution

No single-stage hollow bore gearbox achieves 1/200–1/900. The WPEKA provides both in one unit: K-type hollow bore (shaft inserts directly) and two worm stages (extreme ratio). A unique combination not replicable with single-stage catalogue products.

■ Hollow Bore Diameters: 33.3–90 mm Across Size Range

K-type hollow bore scales from 33.3 mm (size 70–120 combo) to 90 mm (size 155–250 combo) — accommodating the full range of standard industrial driven shaft diameters.

■ Torque Arm Boss for Shaft-Mount Housing Restraint

WPEKA housing includes a torque arm mounting boss for shaft-mount installations where the foot-mount base is not used, providing housing restraint via the torque arm reaction point.

■ Full Double-Stage Torque Through Hollow Bore — No Derating

The hollow bore is rated for identical output torques as the solid-shaft WPEA — up to 6,050 Nm at size 155–250. No torque derating for the K hollow bore option.

■ H7 Tolerance + Hardened Bore Surface

Hollow bore machined to H7 tolerance with hardened surface, preventing bore oval-isation under sustained torque cycling and ensuring precise shaft fit throughout the service life.

■ Dual Oil Chambers with Shaft-Mount Orientation Guidelines

Installation guide provides shaft-mount orientation-specific fill quantities for both chambers, ensuring adequate worm mesh lubrication in all approved shaft-mount installation angles.

⚊ Shaft-Mount Ultra-Slow Conveyor Head Drives

Conveyor head shafts requiring 0.5–5 RPM with very high torque — heavy-duty slow cooling conveyors, drying tunnels — use the WPEKA hollow bore shaft mount at double-stage extreme ratios without external coupling.

☵ High-Viscosity Agitator Shaft Drives

Polymer, adhesive, and specialty chemical agitators operating at 1–3 RPM for viscous mixing use the WPEKA hollow bore directly on the agitator shaft at the extreme ratios these processes require.

⚒ Mining Thickener & Screen Drives

Thickener rake drives, ore screens, and tailings agitators requiring both extreme reduction and hollow bore shaft-mount capability are the WPEKA’s core mining application.

⚔ Solar Tracker & Antenna Shaft Drives

Solar tracking and communication antenna systems requiring 1/900 reduction from standard motors use the WPEKA hollow bore directly onto the tracking shaft — eliminating alignment-critical couplings.

⚛ Bucket Elevator & Vertical Lift Slow Drives

Bucket elevator head shaft-mounts at very slow speeds (2–5 RPM) benefit from the WPEKA’s shaft-mount convenience combined with double-stage torque capacity for heavy bucket chain loads.

✎ ISO 9001:2000 Certified

Every WPEKA is manufactured, assembled, and tested under the ISO 9001:2000 quality management framework. We were among the first in our industry category to achieve this certification.

✎ CE Marking

Full CE marking confirms compliance with EU Machinery Directive 2006/42/EC — covering safety, design standards, and manufacturing quality for mechanical power transmission equipment including double-stage worm gearboxes.

✎ Pre-Shipment Testing (Every Unit)

Noise test (below 72 dB(A) at rated load), oil leak test (30-minute pressurisation, both chambers), torque transmission test (output torque within ±5% of rated). Failed units are reworked — not shipped.

✎ Matched-Pair Manufacturing

Both worm wheel sets for each double-stage unit are manufactured in the same production batch, ensuring tooth profile consistency between primary and secondary stages. This matched-pair quality assurance is unique to our double-stage production process.

“WPEKA on our thickener rake drives. Hollow bore onto the rake shaft at the extreme ratio we needed. Previously had a two-gearbox cascade needing 600mm additional shaft length. The WPEKA saved all of that. Excellent torque consistency, zero seal leaks in 20 months.”

“WPEKA-120/175 drives our ore screen rotation at 2.5 RPM. Hollow bore shaft-mount at 1/600 ratio is perfect. Cast iron housing handles the screener vibration far better than the aluminium alternatives we evaluated.”

“WPEKA hollow bore on our solar tracker azimuth drives. 1/900 ratio with hollow bore shaft mount eliminated the coupling misalignment causing tracking accuracy issues. Tracker accuracy improved from ±0.5° to ±0.1°.”

“WPEKA-80/135 on our indexing conveyor drives. Hollow bore shaft-mount at 1/400 gives exactly 3.75 RPM from our 1,500 RPM motor. Excellent indexing precision. Note: dual oil fill process needs clear multi-language documentation for our maintenance team.”