WPEA 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 WPEA 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.

Both reduction stages share a single FC20+ dual-chamber cast iron housing. No intermediate coupling shaft, no external m… 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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■ Two Worm Stages in One Housing — No Intermediate Shaft

Both reduction stages share a single FC20+ dual-chamber cast iron housing. No intermediate coupling shaft, no external mounting frame between stages — the complete ultra-high-ratio reducer in a single bolt-down unit.

■ Ratio 1/200 to 1/900+ — Standard Motor Input

A standard 1,450 rpm motor input becomes 1.6–7.3 rpm at size 40–70 ratio 1/900. Covers the full ultra-low output speed requirement without custom gearing or planetary add-on stages.

■ Output Torque to 6,050 Nm — Size 155–250

The largest size combination (155–250 mm) delivers up to 6,050 Nm at the highest available ratio — matching the torque demands of heavy-duty solar tracker drives and large valve actuators.

■ Matched Tin-Bronze Worm Wheels — Both Stages

Both worm wheel pairs use the same ZCuSn10Pb1 tin-bronze alloy and precision hobbing process, ensuring consistent mesh efficiency and noise performance across the two-stage reduction.

■ Bilateral A-Type Input — Standard Motor Coupling

The A-type solid input shaft accepts standard motor couplings from either side. No special motor adaptor required — the WPEA installs with the same motor connection hardware as a standard WPA.

■ FC20+ Dual-Chamber Cast Iron Housing — Full Rigidity

The dual-chamber housing is machined from a single FC20+ casting to maintain precise inter-stage alignment. No bolted split between stages — the worm shaft centreline geometry is set permanently at manufacture.

☀ Solar Tracker Drives

WPEA ratios from 1/500 to 1/900 reduce standard motor speed to the 1–5 rpm range required for photovoltaic panel tracking drives. Single-unit installation eliminates the multi-stage drive train complexity of alternative approaches.

⚒ Industrial Valve Actuators

Gate valves, butterfly valves, and sluice gates requiring ultra-low output speed and high output torque are standard WPEA applications. Size 100–155 at 1/800 delivers 2,100 Nm from a standard 3.69 kW motor input.

⚙ Slow-Speed Conveyor Drives

Cooling conveyors, curing conveyors, and controlled-rate feed systems requiring belt speeds below 0.1 m/s use WPEA double-stage reduction to achieve the necessary output speed without VFD controls.

☷ Antenna & Satellite Positioning

WPEA extreme-ratio reductions provide the fine angular control needed for large antenna and satellite dish positioning systems where backlash and ratio precision are both critical.

■ 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.

“WPEA-80–135 on our solar tracker drives. Ratio 1/600 from a standard motor gives us exactly the panel rotation speed we need. One unit, one mounting frame, no intermediate coupling — clean installation.”

“Used WPEA on our industrial valve actuators. The 1/800 ratio from a small motor delivers the torque we need for large gate valves. Far simpler than the multi-stage drive system we previously used.”

“WPEA on our curing conveyor drives. Ultra-slow belt speed with standard motor input — no VFD needed. The dual-stage unit is more compact than the equivalent two-reducer configuration.”

“Good double-stage reducer for extreme ratio applications. WPEA-100–155 on our antenna positioning drives. Precise ratio, good torque. Would appreciate tighter backlash specification for demanding positioning applications.”