WPES Double Speed Cast Iron Worm Reducer — WP Series

Single-stage worm reducers achieve ratios up to 1/60. When applications demand 1/200, 1/500, or 1/900 — solar trackers, valve actuators, slow-speed conveyors, and positioning drives — a second worm stage is the engineering answer. The WPES places two matched worm stages in tandem in a single cast iron housing, delivering ratios from 1/200 to over 1/900 in one compact, foot-mount unit with no intermediate shafting, no external coupling between stages, and no additional mounting frame.

Combines two worm stages with S-type top-entry input, enabling the motor to mount overhead while achieving ratios that n… The dual-stage architecture uses matched tin-bronze worm wheels and 20CrMnTi worm shafts at both stages, providing consistent mesh quality and noise performance across the full ultra-high ratio range.

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■ S-Type Top-Entry + Double Stage — Overhead Motor at 1/200–1/900+

Combines two worm stages with S-type top-entry input, enabling the motor to mount overhead while achieving ratios that no single-stage reducer can reach. Reduces lateral machine footprint at ultra-high ratio.

■ Same Torque Ratings as WPEA — S Input Does Not Reduce Capacity

S-type top-entry designation changes input shaft direction only. WPES worm gear internals and torque ratings are identical to the WPEA — up to 6,050 Nm from size combination 155–250.

■ Matched Dual-Stage Worm Wheels — Both Stages

Both reduction stages use precision-matched ZCuSn10Pb1 tin-bronze worm wheel pairs for consistent inter-stage ratio accuracy across the full 1/200–1/900+ range.

■ Overhead Motor Reduces Lateral Footprint

S-type input positions the motor vertically above the dual-stage reducer. In confined-width installations where lateral motor projection would exceed available space, WPES resolves the constraint without sacrificing ratio capability.

■ Bilateral Input Option Maintained

The S-type top-entry input shaft extends on both sides, accepting coupling connections from either direction — the same flexibility as the standard WPS single-stage unit.

■ FC20+ Dual-Chamber Cast Iron Housing

Single-cast dual-chamber housing from FC20+ grey cast iron maintains inter-stage alignment across the operating temperature range. No bolted joint between stages — worm shaft centreline geometry is set at manufacture.

☀ Overhead-Motor Solar Tracker Drives

WPES combines ultra-high ratio reduction with overhead motor geometry — reducing the lateral projection of the drive assembly on solar tracker frames where horizontal space between panels is constrained.

⚒ Valve Actuators in Tight Lateral Spaces

In pipe galleries and valve manifolds where lateral clearance beside the actuator drive is limited, WPES overhead motor positioning achieves the required 1/200–1/900+ ratio within the available installation envelope.

⚙ Slow-Speed Drives in Narrow Machine Frames

Machinery with constrained lateral width — narrow conveyors, slim elevator frames, compact processing lines — uses WPES to achieve ultra-high ratio reduction while keeping the motor above the frame rather than beside it.

⚊ Overhead-Driven Positioning Systems

Where the mechanical design requires the motor to be above the driven equipment and the output speed must be below 5 rpm, WPES is the standard double-stage solution.

■ ISO 9001:2000 Certified — Dual-Stage Assembly

Every WPE double speed unit undergoes ISO 9001:2000 quality management at both worm stage assembly levels. Inter-stage alignment and combined ratio accuracy are verified before final assembly.

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

Full CE compliance for mechanical power transmission equipment supports export to EU, UK, Australian, and New Zealand markets without re-certification.

■ Pre-Shipment Testing: Noise, Leak, Torque

Noise below 68 dB(A) at rated load, 30-minute pressurisation leak test on both gear chambers, and output torque within ±5% of rated. Non-conforming units reworked before shipment.

■ FC20+ Material Certification — Both Housings

Both the primary and secondary worm housings are verified by FC20 mill certificates: minimum 220 MPa tensile strength, 160–200 HB hardness. Ultrasonic defect testing on size combinations 135–200 and above.

“WPES on our solar panel tracker drives where horizontal clearance between panel arrays is limited. Overhead motor plus 1/600 ratio gives us the tracking speed we need in a narrower drive envelope than the WPEA configuration.”

“Used WPES on our narrow-frame conveyor drives. Motor overhead keeps the drive within the frame width. 1/500 ratio gives us correct belt speed from a standard 4-pole motor. Good solution.”

“WPES on valve actuator drives in our pipe gallery. Limited lateral clearance made WPES the only workable option. Overhead motor, 1/800 ratio, correct torque output for the valve size. Works well.”

“Good S-type double-stage unit for overhead motor applications. WPES-80–135 on our positioning drives. Overhead motor reduces machine width. Would appreciate a combined S+K variant for shaft-mount applications.”