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WPEKS Double Speed Cast Iron Worm Reducer — WP Series

WPEKS Double Speed Cast Iron Worm Reducer — WP Series

The WPEKS double speed worm reducer combines two worm stages, S-type overhead input, and K hollow bore output — ratios 1/200 to 1/900+, overhead motor, direct shaft mount, no output coupling. Size combinations 40–70 to 155–250 mm, torque to 6,050 Nm.

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WPEKS Double Speed Cast Iron Worm Reducer — Product Overview

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 WPEKS 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.

The WPEKS is the only WPE unit that simultaneously provides S-type overhead motor entry, K-type hollow bore output, and … 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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WPEKS double speed cast iron worm reducer two-stage ultra-high ratio

WPEKS Double Speed Worm Reducer Specifications

WPEKS double speed worm reducer dimension drawing two-stage size combination

Parameter Specification
Series Double Speed WPE+K+S
Housing Solid integral cast iron, dual-stage
Input Solid shaft — above (S-type)
Output Hollow bore — K-type
Ratio Range 1/200–1/900+
Size Combinations 40–70 to 155–250 mm
Mounting Foot-mount or shaft-mount with torque arm
Housing Material FC20+ grey cast iron, dual-chamber
Worm Wheels Matched pair tin-bronze ZCuSn10Pb1, both stages
Worm Shafts 20CrMnTi case-hardened 55–60 HRC, both stages
Lubrication N220–N320 (−30°C–40°C); N320–N460 (40°C–65°C), both chambers
Max Oil Temp 95°C continuous
Weight Range 20–462 kg
Key Feature Double-stage + K hollow bore + S overhead input — overhead motor, shaft-mount output, extreme ratio

Size Combination & Performance Data

Size Combo Ratio Input (kW) Output Torque (Nm) A (mm) AA (mm) AB (mm) BB (mm) Weight (kg)
40–70 1/200 0.48 250 286 195 153 131 20
50–80 1/300 0.65 350 297 197 144 142 27
60–100 1/400 0.95 500 363 231 175 169 44
70–120 1/500 1.64 840 408 256 193 190 73
80–135 1/600 2.5 1,400 471 298 226 210 101
100–155 1/800 3.69 2,100 555 354 269 252 144
120–175 1/900 5.09 3,050 568 379 287 255 201
135–200 1/900+ 7.22 3,950 662 425 318 319 293
155–250 1/900+ 11.71 6,050 795 510 380 385 462

WPEKS Double Speed Worm Reducer — Core Features

■ K+S+Double Stage — Three Functions: Overhead Motor + Hollow Bore + Extreme Ratio

The WPEKS is the only WPE unit that simultaneously provides S-type overhead motor entry, K-type hollow bore output, and two-stage extreme ratio reduction — the complete feature set for overhead-motor shaft-mount ultra-high-ratio drives.

■ S-Type Top Entry — Motor Overhead, Drive Compact

Overhead motor positioning minimises lateral machine width at extreme ratios where a side-entry motor would project beyond the structural envelope of compact machines and tracker frames.

■ K Hollow Bore — Direct Shaft Connection at 6,050 Nm

Hollow bore output connects the driven shaft directly even at 6,050 Nm maximum output torque (size 155–250). No output coupling hardware — shorter installed length, no coupling fatigue at extreme torque levels.

■ Shaft-Mount Capability — Torque Arm Restraint

The torque arm boss enables WPEKS shaft-mounting directly onto the driven equipment shaft — motor overhead, shaft through bore, no separate mounting frame. The most mechanically integrated configuration in the WPE series.

■ Dual-Stage Ratio to 1/900+ — Standard Motor, Ultra-Slow Output

9 rpm motor input (1,450 rpm / 1/900 / two stages) produces output shaft rotation well below 2 rpm without VFD controls. Single motor, single unit, no intermediate components.

■ Matched Dual-Stage Precision — Consistent Ratio at Both Stages

Both worm wheel stages are precision-matched at manufacture, ensuring inter-stage ratio accuracy is maintained across the service life — essential for positioning drives and solar tracker applications requiring repeatable angular positioning.

WPEKS Worm Reducer — Industry Applications

WPEKS double speed worm reducer ultra-high ratio industrial applications

☀ Solar Tracker Overhead Motor Shaft-Mount

WPEKS shaft-mounts on the tracker rotation shaft with overhead motor entry — the most mechanically integrated solar drive configuration: no mounting frame, no coupling at either end, overhead motor fits within panel spacing.

⚙ Slow Conveyor Head Shaft Overhead Motor Drive

For narrow conveyor frames where the motor must be overhead and the head shaft is keyed, WPEKS provides direct shaft mounting and overhead motor in a single double-stage unit — output speeds below 3 rpm from standard motor.

⚒ Valve Actuator Shaft-Mount with Overhead Motor

Valve stem shaft insertion through WPEKS K-bore with overhead IEC motor coupling — eliminates both the adaptor plate and the output coupling from the actuator drive. Overhead motor keeps electrical connections above process fluid level.

⚊ Compact Turntable Drives — Overhead + Shaft Through

Central turntable pivot shaft passes through WPEKS hollow bore with the motor overhead — extremely compact turntable drive architecture achieving extreme ratio reduction in the minimum possible envelope.

Ever Power Manufacturing Quality — WPE Double Speed Worm Reducer

Ever Power double speed worm reducer dual-stage manufacturing

■ 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.

WPEKS Double Speed Worm Reducer — Customer Reviews

★★★★★

“WPEKS on our solar tracker rotation shafts with overhead motor configuration. Shaft through K-bore, motor overhead via S-type coupling, 1/600 ratio — most compact tracker drive assembly we have designed. No mounting frame needed.”

Darwin — P.A.
★★★★★

“Used WPEKS on our narrow conveyor head shaft drives. Motor overhead within the frame width, hollow bore on the head shaft, 1/500 ratio. Output belt speed exactly right without VFD. Straightforward installation.”

Christchurch — J.H.
★★★★★

“WPEKS on valve actuator drives with overhead motor requirement. Valve stem through K-bore, motor overhead via S coupling — no coupling hardware in the process area at all. Significant improvement over the previous arrangement.”

Singapore — F.W.
★★★★☆

“Good K+S double-stage unit. WPEKS-70–120 on our turntable drives. Overhead motor, shaft through bore, 1/500 ratio — very compact installation. Would like a torque arm kit available as a standard accessory.”

Osaka — T.N.

Frequently Asked Questions — WPEKS Double Speed Worm Reducer

▶ What distinguishes WPEKS from WPES and WPEKA?
WPES has S-type top input with a solid output shaft. WPEKA has A-type bottom input with K hollow bore. WPEKS combines S-type top input with K hollow bore — overhead motor and coupling-free shaft output simultaneously, at extreme ratios.
▶ What hollow bore diameters are available in the WPEKS?
WPEKS hollow bore diameters are identical to WPEKA: 40–70=18.8 mm, 50–80=22.8 mm, 60–100=28.3 mm, 70–120=33.3 mm, 80–135=38.3 mm, 100–155=43.3 mm, 120–175=48.8 mm, 135–200=64.4 mm, 155–250=90 mm. GB/T 1095 keyways standard.
▶ Can WPEKS be shaft-mounted with the motor overhead?
Yes. This is the primary installation mode for WPEKS. Insert the driven shaft into the K hollow bore, key it, mount the torque arm reaction bracket, then connect the motor coupling to the S-type top-entry shaft overhead. No separate mounting frame, no coupling at either end.
▶ Is the oil circuit adjusted for the S-type top-entry orientation in WPEKS?
Yes. The first-stage oil volume is specified for S-type orientation in the WPEKS lubrication table. The second stage oil volume is the same as other WPE configurations at the equivalent size combination. Fill both chambers independently.
▶ What is the maximum output torque for WPEKS?
WPEKS size combination 155–250 delivers up to 6,050 Nm — identical to WPEA and WPES at the same size, since all A-type and S-type WPE variants share the same worm gear internals and torque ratings. The K-bore and S-input affect only the shaft interface, not the torque.

Get Your WPEKS Quote Today

Tell Ever Power your application requirements — torque, ratio, mounting, and shaft dimensions. Engineering response within 24 hours. OEM specifications, bulk pricing, and global shipping available.

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