EP-WPWEDK Double Speed Reducer
The EP-WPWEDK is a double worm gear reducer with a distinguishing feature shared by very few units in this class: an integrated motor flange face machined directly onto the housing, combined with a hollow output bore that accepts the driven shaft without a separate coupling. This twin advantage — direct motor mounting and through-shaft output — makes the WPWEDK the most installation-friendly unit in the WPWED double-speed family. Input power ratings span 0.12 kW at the compact 40-70 frame through to 5.5 kW at the large 155-250 frame, with the weight range covering 18 kg at the lightest up to 450 kg at the heaviest, giving procurement engineers a single product family that scales from light automation through to continuous heavy-process drives.
The cascaded dual-stage worm mesh produces overall worm gear reduction ratios between 1/200 and 1/900 from a standard AC motor input speed, without any need for external intermediate components. Three shaft direction options — A, B, and C — cover single hollow-bore output and opposing dual-bore arrangements, accommodating a wide variety of machine geometries. The WPWEDK is a natural fit wherever a machine designer wants to mount the motor directly to the gearbox face (eliminating a separate motor bracket and coupling), pass a driven shaft through the output bore, and achieve the very high reduction ratios that only a double worm gear drive can provide in a comparable envelope.
Industrial Power Transmission · Double Speed Series
EP-WPWEDK Double Speed Reducer
A flange-mounted hollow-bore double speed reducer that pairs two worm stages inside a single ribbed cast-iron housing with an integrated motor flange face — spanning 18 kg entry-level frames through to 450 kg heavy-duty configurations and delivering worm gear reduction ratios up to 1/900 for demanding slow-speed industrial drives worldwide.
Technical Specifications — EP-WPWEDK Series Double Speed Reducer
All external dimensions in mm. Weight in kg. Motor flange bolt circle as listed. Input shaft T×V and output bore W×Y dimensions in mm.
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Size |
Power (kW) | Ratio | เอ | AB | B | BE | AC | BC | AD | BD | HL | LL | H | Z×L | Motor Flange (LA×LB) | Input Hole T×V (mm) | Output Bore W×Y (mm) | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 40-70 | 0.12 | 1/200 | 314 | 153 | 130 | 75 | 152 | 86 | 125 | 65 | 200 | 90 | 215 | M10×25 | 115×95 | 4×12.8 | 8×33.3 | 18 |
| 50-80 | 0.18 | 1/200 | 314 | 144 | 150 | 83 | 169 | 102 | 140 | 70 | 235 | 105 | 250 | M12×28 | 115×95 | 4×12.8 | 10×38.3 | 28 |
| 60-100 | 0.37 | 1/200 | 387 | 175 | 160 | 91 | 216 | 117 | 180 | 90 | 290 | 130 | 310 | M12×30 | 130×110 | 5×16.3 | 12×43.3 | 44 |
| 70-120 | 0.37 | 1/300 | 425 | 193 | 175 | 109 | 256 | 124 | 220 | 100 | 345 | 155 | 370 | M14×32 | 130×110 | 5×16.3 | 14×48.8 | 66 |
| 0.75 | 1/400 | 445 | 193 | 175 | 111 | 256 | 124 | 220 | 100 | 345 | 155 | 370 | M14×32 | 165×130 | 6×21.8 | 14×48.8 | 66 | |
| 80-135 | 0.75 | 1/500 | 499 | 226 | 210 | 125 | 296 | 147 | 260 | 110 | 400 | 185 | 425 | M16×35 | 165×130 | 6×21.8 | 18×64.4 | 101 |
| 1.5 | 1/600 | 499 | 226 | 210 | 125 | 296 | 147 | 260 | 110 | 400 | 185 | 425 | M16×35 | 165×130 | 8×27.3 | 18×64.4 | 101 | |
| 100-155 | 1.5 | 1/800 | 570 | 269 | 256 | 148 | 345 | 185 | 280 | 120 | 458 | 203 | 461 | M16×35 | 165×130 | 8×27.3 | 20×74.9 | 139 |
| 120-175 | 2.2 | 1/900 | 631 | 287 | 282 | 181 | 374 | 192 | 320 | 140 | 518 | 223 | 521 | M16×35 | 215×180 | 8×31.3 | 22×85.4 | 196 |
| 3.0 | 1/900 | 631 | 287 | 282 | 181 | 374 | 192 | 320 | 140 | 518 | 223 | 521 | M16×35 | 215×180 | 8×31.3 | 22×85.4 | 196 | |
| 135-200 | 3.0 | —— | 680 | 318 | 320 | 202 | 412 | 230 | 360 | 150 | 580 | 245 | 575 | M20×36 | 215×180 | 8×31.3 | 22×90.4 | 285 |
| 4.0 | —— | 680 | 318 | 320 | 202 | 412 | 230 | 360 | 150 | 580 | 245 | 575 | M20×36 | 215×180 | 8×31.3 | 22×90.4 | 285 | |
| 155-250 | 5.5 | —— | 815 | 380 | 400 | 247 | 500 | 285 | 420 | 180 | 705 | 300 | 700 | M24×42 | 265×230 | 10×41.3 | 28×116.4 | 450 |
Motor flange bolt circle listed as LA×LB (pitch circle diameter × bolt circle diameter, mm). Input hole T×V = keyway width × keyway depth. Output bore W×Y = bore diameter × bore depth. Contact our engineering team for non-standard bore sizes and custom ratios.
Five Key Advantages of the EP-WPWEDK Double Speed Reducer
Integrated Motor Flange Mount
The WPWEDK Double Speed Reducer housing incorporates a machined motor-flange face as a standard feature, allowing a matched IEC motor to bolt directly to the gearbox without an adaptor bracket. This eliminates shaft misalignment risk introduced by a separate motor plate and reduces the overall installed height of the drive assembly — a meaningful advantage in space-constrained machine bases and enclosed enclosure designs.
Hollow Through-Bore Output
The hollow output bore allows the driven shaft to pass directly through the gearbox, removing the need for any output coupling hardware. This design significantly shortens the drivetrain's overall axial dimension compared to a solid-shaft unit fitted with a jaw or disc coupling, and eliminates one of the primary misalignment sources in high-ratio worm drive applications on slow-moving industrial machinery.
Ratios to 1/900 in a Single Unit
Two serially arranged worm meshes within one housing produce overall ratios between 1/200 and 1/900 — a range that would require either a very large single-stage gearbox or two separate units in tandem if achieved by conventional means. For machine builders targeting very low output speeds, the WPWEDK is the most space-efficient solution currently achievable within a worm gear reducer gearbox architecture.
Inherent Self-Locking on Load
The worm thread geometry produces a naturally self-locking output — load on the output shaft cannot reverse-drive the worm — which is particularly valued on gate actuators, vertical lifts, and tension-hold applications where a power failure must not result in uncontrolled movement. This characteristic is built into the drive geometry, not a separately sourced add-on, and requires no additional holding-brake installation on most applications in this category.
18 kg to 450 kg — Full Scale Coverage
Nine frame sizes from 40-70 through 155-250 address every weight and torque tier within the double-stage class. A machine designer can specify a single product family across an entire product line range — from a small lab-scale stirrer up to a heavy aggregate mixer — and access consistent interface dimensions, documentation packages, and spare-part strategies from one source rather than managing multiple suppliers.
Working Principle of the Double Worm Reduction Gearbox
Input power enters through a standard IEC motor flange bolted to the machined face of the WPWEDK Double Speed Reducer housing. The motor shaft engages the primary worm via a keyway connection on the input hole shaft (T×V dimension in the specification table). The primary worm meshes at 90° with the primary phosphor-bronze worm wheel, converting the motor's high-speed rotation into a first-stage reduced rotation on the intermediate shaft. The intermediate shaft carries the secondary worm, which in turn drives the secondary worm wheel — this wheel is keyed to the hollow output bore shaft, producing the final, highly reduced output speed.
Because the overall ratio is the product of the two individual stage ratios, the WPWEDK Double Speed Reducer achieves gear reductions that would be physically impossible in a single worm-and-wheel pair of the same housing size. The arrangement is effectively a double reduction worm gearbox in the truest engineering sense: two mechanically independent reductions in series, sharing a common lubrication reservoir and a common ribbed grey cast iron housing that provides both structural rigidity and sufficient surface area for thermal dissipation in standard-duty cycles. The efficiency of the cascade — typically in the 45–65% range depending on ratio and load — means that for continuous high-power applications, thermal rating must be checked alongside mechanical torque rating before confirming the frame size.
The hollow output bore of the double speed reducer is machined to H7 tolerance, ensuring a reliable interference or transition fit with standard shaft diameters. The output shaft bore W×Y dimension (bore diameter × bore depth in mm, as listed in the parameter table) defines the maximum driven shaft size the unit can accept. Keyway dimensions on both input hole (Q, U, T×V) and output bore (S, W×Y) are standardised across the full WPWEDK Double Speed Reducer range, simplifying shaft and key selection at the design stage.
Double Speed Reducer Material Specification & Build Quality
The WPWEDK Double Speed Reducer housing is produced from high-grade grey cast iron, selected for its combination of good machinability, vibration damping, and dimensional stability under the cyclic thermal loading that continuous industrial operation imposes. Heavier frame sizes — particularly 135-200 and 155-250 — can be specified in ductile iron or cast steel where elevated shock resistance or higher ambient temperatures create conditions that push the thermal and mechanical margins of standard grey iron. Cast aluminium housings are also available for the lighter frame sizes in applications where overall drive weight is a constraint, such as overhead-mounted agitator drives in the food sector.
Both worm shafts are forged and machined from 20CrMnTi or equivalent alloy case-hardening steel, carburised to a case depth of 0.8–1.2 mm and hardened to 58–62 HRC at the worm thread flanks. Thread grinding after heat treatment brings the helical flank to DIN 3975 accuracy, which directly governs contact stress distribution and noise level in service. Worm wheels are centrifugally cast in a high-tin phosphor bronze alloy (typically ZCuSn10P1 equivalent), hobbed to mesh geometry, and interference-fitted on the shaft with a parallel key. This steel-on-bronze pairing is standard across worm gear reducer manufacturers internationally and has a well-documented combination of controlled run-in behaviour and consistent long-term friction coefficient.
The hollow output bore is finished to H7 tolerance and the bore keyway to JS9, consistent with ISO 286 fits guidance for light press or sliding fits with standard commercial shafting. Deep-groove ball bearings are used at the primary worm shaft, and tapered or angular-contact roller bearings at the intermediate and output positions to handle the combined radial and axial loading imposed when the driven shaft transmits both torque and bending load through the bore. The external paint system — primer plus topcoat — is available in standard green, and in white or blue variants for facilities where drive-system colour coding supports maintenance or safety programmes.
Double Speed Reducer Application Scenarios
The WPWEDK double speed reducer is particularly well suited to applications where the machine layout benefits from the motor bolted directly to the gearbox face and the driven shaft passing through the output bore — a configuration that eliminates two coupling elements and reduces the number of structural alignment checks during installation and maintenance. The following represent the highest-volume applications across our global customer base.
🌀 Paddle & Ribbon Mixers
Bulk powder mixers, ribbon blenders, and paddle dryers used in the pharmaceutical, food processing, and chemical sectors mount the WPWEDK directly on the mixer frame with the motor bolted to the gearbox flange face. The high-ratio output provides the very low agitator shaft RPM these processes require — typically 3–20 RPM — while the hollow bore accepts the mixer shaft without an outboard coupling that would complicate the sealed-shaft sealing arrangements common in hygienic or hazardous-atmosphere versions used across the Netherlands and UK.
🏗️ Crane & Hoist Auxiliary Drives
Slow-speed slewing auxiliary drives, cable drum traverses, and maintenance-access platforms on overhead cranes in Australian ports and Brazilian steelworks use the WPWEDK's self-locking characteristic to hold position under load when not powered. The heavy duty worm drive gearbox in the 120-175 and 135-200 frame sizes handles the sustained radial loading these applications impose without bearing fatigue over the typical 15-year operational lifespan expected for crane auxiliary systems.
🌾 Forage & Feed Processing
Silage turners, fodder mix augers, and pelleting press infeed conveyors on dairy and livestock farms in Canada and Australia operate under intermittent shock loading from material bridging and compaction events. The WPWEDK's thick-section cast housing and oversized bearing seats handle these transient overloads reliably across seasonal operational cycles, and the integrated motor flange simplifies gearbox replacement during harvest-season maintenance windows when downtime must be minimised.
⚙️ Slow-Speed Conveyor Tail Drives
Flight conveyors, en-masse conveyors, and underground drag-chain conveyors in the mining and aggregate sector rely on the WPWEDK's high torque worm gearbox output at very low shaft speed to ensure controlled product movement without slipping or piling. The hollow bore conveniently accepts the conveyor tail shaft, and the gearbox can be mounted on the tail-drum frame without needing a separate motor-support structure on either side of the conveyor in South Korean and Colombian mineral processing operations.
🚰 Pump & Valve Actuators
Slow-speed pump drives for viscous media — molasses, adhesive slurries, bitumen — and multi-turn valve actuator mechanisms in refineries and water treatment plants use smaller WPWEDK Double Speed Reducer frames (40-70 through 80-135) where the double output worm gearbox provides a precise, stable output speed that open-loop process controllers can rely on without encoder feedback. The self-locking output holds valve position reliably during power interruptions, which is a critical functional requirement on safety-rated shutoff valve installations across the UK and Netherlands.
About us - Double Speed Reducer Manufacturer
More than ten years of production experience in mechanical power transmission informs every decision we make — from raw material selection through to the final assembly torque check. Our manufacturing range extends across agricultural gearboxes, worm speed reducers, planetary drives, power take-off shafts, hydraulic cylinders, precision gears, roller chains, sprockets, and electric motors, giving us the system-level understanding to advise on how a double speed worm gear reducer integrates into the machine drivetrain rather than simply selling a catalogue component in isolation.
Production operates under ISO 9001:2015 certification, covering all stages from incoming material inspection through casting, machining, heat treatment, assembly, and pre-shipment testing. Housing materials available include ductile iron, cast iron, cast steel, precision cast steel, and cast aluminium — all produced or sourced under documented material specifications with traceable mill certificates. Gear components — worm shafts, worm wheels, sprockets, pulleys, and worms — are produced in-house or under closely managed subcontract arrangements, with dimensional inspection records maintained for each production batch. Custom specifications — non-standard bore sizes, special ratios, modified mounting feet, and non-catalogue colour finishes — are accepted as routine engineering requests across all WPWEDK frame sizes.
เวิร์กช็อป
Related Products & System Components
The WPWEDK's integrated motor flange is designed to accept standard IEC frame motors directly, and the full single-reduction worm reducer gearbox range covers the lower-ratio applications that sit alongside the double-stage unit in most plant catalogues. Sourcing both from the same facility simplifies documentation, reduces lead time variation, and ensures flange dimensional compatibility without site-measured adaptors.
มอเตอร์ไฟฟ้า
IEC-frame induction motors in B5 and B14 flange-mount configurations, sized to match the WPWEDK's input flange dimensions across the full 0.12 kW to 5.5 kW power range. When ordered as a matched electrical motors double speed worm gear reducer assembly, the motor shaft-to-gearbox input-hole alignment and key engagement are factory-verified before shipment, removing the risk of site assembly errors that commonly occur when motors and gearboxes are sourced separately.
Single-Stage Worm Gearbox Range
For applications where a ratio between 1/5 and 1/100 satisfies the speed requirement, the single-reduction NMRV, WP, and WPS families offer a more compact and more efficient solution than the double-stage WPWEDK. The premium worm reducer and nmrv worm reducer lines share the same motor-flange standards as the WPWEDK, making it straightforward to specify the lowest-cost solution at each ratio point across a product line. Browse the complete worm gearbox range for full specifications.
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Q1 — What is the advantage of an integrated motor flange on a double speed reducer compared to a separate motor bracket for a mixer drive application in a UK food processing plant?
An integrated motor flange machined directly into the gearbox housing maintains motor-shaft-to-worm concentricity to within the housing's own bore tolerances, typically better than 0.05 mm TIR. A separate bracket introduces additional stack-up tolerances at each bolted joint — bracket-to-gearbox, motor-to-bracket — which can result in radial loads on the primary worm bearing from misalignment. In food-grade applications in the UK, where IP65 or higher-rated motor enclosures must mate cleanly to the gearbox, the integrated flange also simplifies the sealed-joint engineering at the motor-gearbox interface by reducing the number of separate sealing surfaces.
Q2 — How do I determine the right WPWEDK Double Speed Reducer frame size for a ribbon blender running at 5 RPM output in a Netherlands pharmaceutical mixing facility?
Start with the motor speed — a standard 4-pole 50 Hz motor runs at approximately 1440 RPM — and divide by the target output speed to get the required ratio: 1440 ÷ 5 = 288, so a 1/300 ratio WPWEDK Double Speed Reducer is the closest standard option. Next, calculate the output torque your blender shaft requires at 5 RPM and verify that the selected frame size's rated output torque exceeds this by at least your service factor (1.25 for smooth uniform load, 1.5 for variable or reversing duty in pharmaceutical batch blending). Finally, confirm that the output bore W×Y dimension accommodates your blender shaft diameter with the keyway engagement length sufficient for the transmitted torque.
Q3 — Which shaft direction configuration of the EP-WPWEDK Double Speed Reducer is best suited for an overhead paddle mixer mounted on a processing tank in an Australian dairy plant?
Configuration A — with the hollow output bore pointing downward and the motor flange face on top — is the standard arrangement for overhead-mounted vertical agitator drives. This places the motor's weight directly above the gearbox centre of gravity, keeps the motor away from process splashes and steam, and presents the hollow bore vertically downward to accept the agitator shaft with the simplest possible keyway engagement. In Australian dairy applications where CIP (clean-in-place) wash-down is routine, the vertical motor-top mounting also keeps motor ventilation slots away from the high-pressure water spray directed at the gearbox underside.
Q4 — When is a double worm reduction gearbox the better choice over a helical-bevel gearbox for a slow-speed conveyor drive in a Colombian aggregate processing facility?
เดอะ double worm reduction gearbox wins on total purchase cost, ratio range, and inherent self-locking at very high reduction ratios — typically above 1/100. A helical-bevel unit of equivalent ratio and torque capacity is a more complex multi-stage design with higher efficiency (typically 85–95%) but significantly higher unit cost, larger footprint in two of three axes, and no inherent self-locking, meaning a separate brake must be specified for inclined conveyors. In Colombian aggregate processing, where equipment total-cost-of-ownership is weighted heavily against performance overkill, the WPWEDK Double Speed Reducer's combination of adequate torque capacity, self-locking output, competitive pricing, and simple maintenance profile makes it the practical choice for conveyor tail drives running below 5 RPM output.
Q5 — What lubrication type and change interval should be specified for a WPWEDK double speed reducer operating in a South Korean packaging line running two shifts at elevated ambient temperature?
For a two-shift duty cycle with ambient temperatures in the 35–45 °C range typical of un-air-conditioned South Korean packaging facilities in summer, a synthetic polyalphaolefin (PAO) ISO VG 220 gear oil is recommended over mineral oil. Synthetic oil maintains its viscosity index at elevated operating temperatures, reducing internal friction and lowering the gearbox running temperature by 8–12 °C compared to mineral oil of the same viscosity grade — which directly extends bearing and seal life. Change interval with synthetic oil is typically 6,000–8,000 hours versus 3,000–4,000 hours for mineral oil under the same operating conditions. Lip seal inspection at each oil change remains the single highest-return maintenance activity regardless of oil type.
Q6 — Where should procurement teams in Brazil source a certified replacement double speed worm gear reducer for an existing agitator drive with full dimensional drawings and material documentation?
The most reliable approach for sourcing a replacement double speed worm gear reducer in Brazil is to contact an ISO 9001:2015 certified manufacturing facility directly, providing the original unit's nameplate data — frame size, ratio, input power, shaft direction, and key dimensions — along with photographs of the mounting arrangement and output bore connection. A certified manufacturer will confirm dimensional compatibility against their production drawings, issue a formal dimensional confirmation document, and provide the material certificates and inspection records required under Brazilian supplier qualification procedures for plant equipment in the chemical, food, and mining sectors. Always request a factory test record showing no-load running before dispatch on any replacement unit intended for critical-path process equipment.
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