WPES Double Speed Cast Iron Worm Gearbox — WP Series

Overhead motor configurations — where the motor sits above the gearbox with its shaft entering from above — combined with ultra-high reduction ratios are required by process plants with fixed overhead motor platforms, clean room equipment with ceiling-mount motors, and reactor buildings where motors must be above the drive. A single-stage WPS delivers maximum 1/60. The WPES Double Speed Cast Iron Worm Gearbox combines S-type input (motor from above) with double-stage worm reduction, delivering ratios from 1/200 to 1/900 with overhead motor geometry — eliminating a second gearbox stage from every elevated slow process drive.

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■ S-Input (Overhead Motor) + Double-Stage: Both Challenges in One Unit

WPES solves two challenges simultaneously: S-type upward input shaft for overhead motor configuration, and double-stage worm reduction for 1/200–1/900 ratio. Previously requiring a separate S-input adaptor plus a second gearbox stage.

■ Oil Circuit Validated for S-Input + Double-Stage Geometry

Internal oil channels, fill ports, and air vents are specifically positioned for the S-input double-stage geometry — unlike improvised solutions using standard gearboxes in non-rated orientations.

■ Same Output Torques as WPEA — No Compromise for S-Input

The S-input orientation does not reduce WPES output torque rating. Maximum torques are identical to the WPEA for the same size combination — up to 6,050 Nm at size 155–250.

■ Vertical Motor Bracket System Compatible

The WPES housing geometry accommodates standard vertical motor mounting brackets, providing complete overhead motor configuration support without custom fabrication.

■ Bilateral Input Shaft in S-Orientation

Even in the S-type overhead configuration, the input shaft accepts motor coupling from either left or right, giving installation flexibility for overhead motor positioning in confined plant spaces.

■ Primary Stage Bearings Calibrated for S-Type Input Loads

The S-type input shaft orientation places specific axial and radial loads on the primary stage input bearings. The WPES bearing selection and preload specification accounts for these S-input loads at the full double-stage torque rating.

⚔ Overhead Motor Slow Process Equipment

Process plants with fixed overhead motor positions use the WPES double-stage to achieve slow output speeds without adding floor-level gearbox stages — maintaining the overhead motor layout specified by the building structure.

☵ Slow Mixing Vessels — Overhead Motor Layout

Batch vessels where overhead motor mounting is the specified design and slow agitation (1–10 RPM) is required use the WPES for a clean vertical motor stack with double-stage ratio in one housing.

⚒ Tunnel Dryer Conveyor — Overhead Motor Position

Tunnel dryer conveyor drives with overhead motor mounting and very slow belt speeds use the WPES for the S-type overhead motor geometry at extreme reduction ratios.

⚊ Elevated Platform Drive Stations

Process plant elevated motor platforms where the motor is positioned above the gearbox as a safety and maintenance requirement use the WPES double-stage for all ultra-slow drive positions.

⚛ Ceiling-Mount Slow Equipment — Restricted Floor Space

Facilities where floor space is strictly limited and motors must be ceiling-mounted above all equipment use the WPES for extreme ratio reduction with overhead motor geometry.

✎ ISO 9001:2000 Certified

Every WPES 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.

“WPES double-stage on our crystalliser overhead drives. S-input geometry gave us the overhead motor configuration our building structure required, and double-stage ratio gave us the 2 RPM agitation speed our process needs. One unit solved two problems. Excellent reliability for 24 months.”

“Our overhead motor drives needed double-stage ratio — a combination we could not find in any other standard catalogue. The WPES was specified and delivered exactly to our drawing. S-input oil circuit validation gave our process engineers confidence the unit was engineered for this orientation.”

“We standardised on WPES for all our overhead motor slow process drives. S-input double-stage combination was previously impossible from one standard product. Consistency across multiple orders is perfect — every unit matches the specification data precisely.”

“WPES-80/135 on our overhead slow mixer drives. Overhead motor + 1/600 ratio in one unit — exactly what our plant layout required. Solid cast iron quality. First oil fill instructions for S-orientation double-stage could be clearer, but unit performance is excellent.”