EP-WPWA-S Universal-Geschwindigkeitsreduzierer
The EP-WPWA-S is a compact, heavy-duty universal speed reducer built on the well-established WPW worm gear architecture. Available in two primary housing configurations — WPWA (horizontal input, solid base mount) and WPWS (flange-input variant) — this series covers frame sizes from 40 through 250, output torque ranges extending to the 350 kg load class, and reduction ratios from 1/5 to 1/60. The result is a single product family that handles the majority of industrial and agricultural low-speed, high-torque drive requirements without needing custom engineering for each application.
The defining mechanical feature of any worm gear speed reducer in this class is the 90-degree shaft angle between input and output. This geometry lets the EP-WPWA-S fit into drive train layouts where inline or parallel reducers are simply impractical — between a motor and a conveyor drive at a right angle, or as the turn-point in a multi-axis packaging line. The worm gear reduction ratio also provides inherent back-drive resistance, which in many applications eliminates the need for a separate brake mechanism and reduces both component count and maintenance overhead.
Shaft direction flexibility is one of the defining practical advantages of the WPW series. Five standard shaft direction configurations — labelled A through E — cover combinations of input-left/output-right, input-top, dual-output, and extended shaft arrangements. This means the same housing can serve multiple installation orientations across different plant layouts, reducing the number of unique spare part numbers an engineering or maintenance team needs to stock. The EP-WPWA-S is supplied as a standalone Schneckengetriebe unit or combined with a matched electric motor as a motorized worm reducer drive package, depending on the customer’s system integration requirements.
EP-WPWA-S Universal-Geschwindigkeitsreduzierer
WPW Series Worm Gear Speed Reducer — Size 40–250 | Ratio 1/5–1/60 | Up to 350 kg Load Capacity
EP-WPWA-S Technical Specifications — Dimensional Data
| Größe | Verhältnis | A | AB | B | BB | AC | BC | CC | HL | LL | H | M | N | E | F | G | Z | HS | U | T×V | Gewicht (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 40 | 1/5 | 143 | 87 | 114 | 74 | 95 | 61 | 40 | 45 | 60 | 135 | 100 | 130 | 80 | 110 | 10 | 10 | 25 | 12 | 4×2,5 | 4.5 |
| 50 | 1/10 | 175 | 108 | 150 | 97 | 111 | 68 | 50 | 50 | 80 | 165 | 120 | 140 | 95 | 110 | 12 | 12 | 30 | 12 | 5×3 | 7.5 |
| 60 | 1/15 | 198 | 120 | 168 | 112 | 127 | 76 | 60 | 60 | 93 | 195 | 130 | 150 | 105 | 120 | 18 | 12 | 40 | 15 | 5×3 | 11.5 |
| 70 | 1/20 | 231 | 140 | 194 | 131 | 152 | 86 | 70 | 73 | 108 | 233 | 150 | 190 | 115 | 150 | 18 | 15 | 40 | 18 | 5×3 | 15.5 |
| 80 | 1/25 | 261 | 160 | 214 | 142 | 169 | 102 | 80 | 83 | 123 | 268 | 170 | 220 | 135 | 180 | 18 | 15 | 50 | 22 | 7×4 | 24 |
| 100 | 1/30 | 322 | 190 | 254 | 169 | 216 | 117 | 100 | 100 | 150 | 330 | 200 | 270 | 155 | 220 | 20 | 15 | 50 | 28 | 10×4,5 | 39 |
| 120 | 1/40 | 371 | 219 | 282 | 190 | 256 | 124 | 120 | 120 | 180 | 305 | 230 | 320 | 180 | 260 | 25 | 18 | 65 | 30 | 7×4 | 57 |
| 135 | 1/50 | 422 | 249 | 317 | 210 | 296 | 147 | 135 | 135 | 215 | 455 | 250 | 350 | 200 | 290 | 30 | 18 | 75 | 35 | 10×4,5 | 85 |
| 155 | 1/60 | 497 | 295 | 382 | 252 | 345 | 185 | 155 | 155 | 235 | 493 | 280 | 380 | 220 | 320 | 32 | 20 | 85 | 40 | 18×7 | 110 |
| 175 | 1/60 | 534 | 314 | 373 | 255 | 374 | 192 | 175 | 160 | 260 | 558 | 310 | 410 | 250 | 350 | 37 | 21 | 85 | 45 | 14×5,5 | 152 |
| 200 | 1/60 | 580 | 342 | 426 | 319 | 412 | 230 | 200 | 175 | 290 | 620 | 355 | 445 | 290 | 390 | 45 | 24 | 95 | 50 | 20×7,5 | 216 |
| 250 | 1/60 | 705 | 420 | 552 | 385 | 500 | 285 | 250 | 200 | 350 | 750 | 460 | 560 | 380 | 480 | 50 | 28 | 110 | 60 | 25×9 | 350 |
Five Key Advantages of the EP-WPWA-S Universal Speed Worm Reducer
① Wide Frame Size Range
Eleven frame sizes from 40 to 250 allow engineers to match the physical envelope and output torque precisely to the driven machine — without the over-specification that drives up cost and weight. A size 40 unit weighs 4.5 kg; a size 250 weighs 350 kg. That spread covers everything from a small conveyor drive in a food processing plant to a heavy-duty mixing paddle in a chemical reactor vessel.
② Flexible Shaft Direction Configurations
Five shaft direction options (A–E) are built into the same housing family. Whether the installation requires a standard left-in/right-out layout, a top-input arrangement, or a dual-output extension, the EP-WPWA-S universal speed reducer accommodates it without custom tooling. This is a significant advantage for OEMs designing machinery for export to multiple markets where installation space constraints vary.
③ Broad Reduction Ratio Selection
Six standard reduction ratios — 1/5, 1/10, 1/15, 1/20, 1/25, 1/30, 1/40, 1/50, 1/60 — allow precise output speed tuning without intermediate gear stages. In applications where a worm gear reduction ratio of 1/60 is selected, the inherent self-locking tendency of the worm thread geometry also provides functional back-drive resistance, removing the need for a separate holding brake in many vertical-load or gravity-assisted conveyor applications.
④ Cast Iron Housing for Rigidity and Heat Dissipation
The ribbed cast iron housing does two jobs simultaneously: it provides structural rigidity under the bending moments imposed by shaft overhang loads, and the external fin geometry increases surface area for passive heat dissipation during continuous-duty operation. In ambient temperatures up to 40°C — standard in many industrial environments across Southeast Asia, the Middle East, and equatorial Africa — the WPW housing maintains acceptable sump temperatures without forced cooling.
⑤ Direct Motor Flange Mounting
The WPWS variant is designed with an IEC-standard input flange that accepts direct motor face-mount without a coupling or intermediate bracket. This compact motorized worm reducer configuration reduces axial length, eliminates shaft alignment requirements, and cuts installation time significantly — a practical advantage for machine builders in Europe, Australia, and North America where assembly labour is a significant portion of machine cost.
How Does a Worm Gear Reducer Work — EP-WPWA-S Operating Principle
The operating principle of a universal speed reducer in the WPW family starts with the worm shaft — the input element. The worm is a helical thread machined onto a hardened steel shaft, and it meshes at 90 degrees with a worm wheel: a bronze or cast iron gear with curved tooth forms that wrap around the worm thread profile. As the worm rotates, each thread lead advances the worm wheel by one tooth pitch per revolution — creating the speed reduction and corresponding torque multiplication that defines worm gear drive behaviour.
The worm gear reduction ratio is determined by the number of worm wheel teeth divided by the number of worm thread starts. A single-start worm meshing with a 60-tooth wheel produces a 1/60 ratio — sixty motor revolutions for every one output revolution, with a corresponding 60-fold increase in torque (minus efficiency losses). The EP-WPWA-S universal speed reducer is engineered across its ratio range with lead angles and pressure angles selected to balance mechanical efficiency against self-locking behaviour, because those two characteristics trade off against each other as the ratio increases.
At higher reduction ratios, the lead angle becomes shallower, friction increases, and the gear set approaches a self-locking condition where back-torque from the load cannot rotate the input shaft. This is useful in lifting or indexing applications but comes with lower forward efficiency. At lower ratios — 1/5, 1/10 — efficiency is higher and the set is back-drivable. Understanding this trade-off is what distinguishes a correctly specified worm speed reducer from one that either overheats under load or requires an unnecessary holding brake. The EP-WPWA-S universal speed reducer datasheet provides efficiency curves across the ratio range for this reason.
Materials & Manufacturing Standards
The EP-WPWA-S universal speed reducer housing is cast in grey iron to GB/T 9439 HT200 specification — the same grade used in heavy-duty machine tool beds, chosen here for its excellent vibration-damping properties and machinability. After casting, the housing undergoes precision boring on a machining centre with positional tolerances held to ±0.02 mm on the bearing bore centres, which ensures correct shaft parallelism and worm-to-wheel contact geometry throughout the housing's service life regardless of mounting orientation.
The worm shaft is manufactured from 20CrMnTi case-hardening steel, carburised and hardened to a case depth of 0.8–1.2 mm and a surface hardness of 58–62 HRC. This hardness level, combined with the carburised case's compressive residual stress, gives the worm thread flanks high resistance to abrasive wear even under boundary lubrication conditions that occur during start-stop cycling. The worm wheel rim material is phosphor bronze (ZCuSn10Pb1) centrifugally cast onto a ductile iron hub — the bronze provides low friction and good conformability to the hardened worm flank, while the ductile iron hub handles the torsional load transfer to the output shaft without risk of brittle fracture.
Input and output shaft bearings are deep-groove ball bearings on the worm shaft and taper roller bearings on the worm wheel shaft in sizes 100 and above, where axial load capacity becomes the governing factor under shaft overhang conditions. All bearings are supplied with rated C3 internal clearance for operation at elevated temperatures, and the bearing housings include integral oil seals rated for the mineral gear oil used in the EP-WPWA-S universal speed reducer sump. The IEC-standard input flange on the WPWS variant is machined to a fit tolerance that accepts direct face-mount motors without shimming.
Application Scenarios — Where the EP-WPWA-S Universal Speed Reducer Is Used
Food & Beverage Conveyor Drives — Europe & Australia
Hygienic conveyor lines in food processing facilities in Germany, France, and Australia use the EP-WPWA-S universal speed reducer at 1/20–1/40 ratios to drive belt and slat conveyors at controlled speeds. The cast iron housing accepts washdown cleaning without ingress concerns at the shaft seal points, and the 90-degree geometry keeps the motor clear of the product zone — a layout advantage in the tight floor plans of bottling and packaging halls.
Agricultural Machinery Drive Trains — US & Brazil
Grain auger drives, seed metering systems, and fertiliser spreaders across the US and Brazilian agricultural equipment sector rely on compact worm speed reducers to step down PTO or electric motor speed to the low-RPM, high-torque output that soil-engaging or grain-handling mechanisms require. The EP-WPWA-S universal speed reducer at sizes 70–120 covers the torque range needed for most mid-scale agricultural implement applications.
Material Handling & Lifting Equipment — Southeast Asia
In manufacturing and warehouse facilities across Malaysia, Vietnam, and Thailand, the EP-WPWA-S at 1/50–1/60 ratios with self-locking capability replaces mechanical brakes on vertical-axis lifting and gate-raising drives. The inherent back-drive resistance of a high-ratio worm drive gearbox holds load positions without powered braking — reducing electrical consumption and eliminating brake maintenance on multi-shift operations.
Chemical & Water Treatment Plant Drives — Middle East & South Korea
Sludge agitator drives, valve actuators, and chemical dosing pump drives in water and wastewater treatment plants across South Korea and the Gulf states use heavy-duty worm drive gearboxes at the larger frame sizes. The EP-WPWA-S size 175–250 range handles the continuous-duty torque loads of slow-speed mixing applications, where the low output RPM and high torque multiplication of the 1/60 ratio eliminates the need for additional speed reduction stages.
Worm Gear Reducer Manufacturer
Our production facility has operated for more than ten years manufacturing mechanical power transmission equipment across a broad product range: agricultural gearboxes, worm gear reducers, planetary gear drives, power take-off shafts, hydraulic cylinders, gears, sprockets, and custom assemblies. The facility holds ISO 9001:2015 certification, and quality control is integrated throughout the process — from incoming material inspection of casting blanks through to final output torque and backlash testing on finished gearbox units.
We design and manufacture in ductile iron, cast iron, cast steel, precision cast steel, and cast aluminium, producing both standard catalogue products and non-standard mechanical parts to customer drawings. The same machining infrastructure that produces worm gear housings to ±0.02 mm bore tolerances also manufactures gears, sprockets, worm gears, pulleys, worm shafts, and other drive components — all under one roof. This vertical integration means dimensional consistency across mating parts and a single point of technical accountability for the entire drivetrain.
Werkstatt
Compatible Products — Complete Drive System from One Source
The EP-WPWA-S is designed to interface directly with standard IEC motor frames and our full range of drivetrain accessories — no custom adapters needed.
Pairing the EP-WPWA-S with a matched electric motor creates a motorized worm reducer drive unit ready for direct installation. Our electric motor range covers single-phase and three-phase IEC-frame motors from 0.18 kW to 22 kW — sized to deliver the rated input speed and power for each WPW frame size and reduction ratio.
Beyond the WPW series, our full worm gearbox range extends across NMRV, RV, WD, and CW housing types — covering reduction ratios from 1:5 to 1:100 in both compact aluminium and heavy-duty cast iron housings. For applications where the EP-WPWA-S operating ratio or mounting configuration does not fit exactly, our technical team can identify an alternative from the broader worm reducer gearbox catalogue without switching suppliers.
Häufig gestellte Fragen
Q1. How does a worm gear reducer work, and what makes the EP-WPWA-S suited for continuous-duty industrial drives in Southeast Asia?
A worm gear reducer converts high-speed, low-torque motor rotation into low-speed, high-torque output through the meshing of a hardened worm shaft against a bronze worm wheel at 90 degrees. Each rotation of the worm advances the wheel by one tooth pitch — producing the speed reduction and torque multiplication that defines the drive. The EP-WPWA-S universal speed reducer suits continuous-duty applications in warm industrial environments like those in Malaysia, Vietnam, and Thailand because the ribbed cast iron housing passively dissipates heat during extended operation, the phosphor bronze wheel material maintains good conformability under sustained load, and the taper roller bearings used in larger frame sizes handle the sustained axial loads of conveyor and agitator drives without requiring frequent adjustment.
Q2. What is the purpose of a universal speed reducer in an agricultural machinery drive system on a US or Brazilian farm?
In agricultural equipment, the purpose of a universal speed reducer is to translate the high-speed output of an electric motor or PTO shaft into the much lower RPM and higher torque that soil-engaging or grain-handling mechanisms need to operate correctly. A seed metering wheel that runs at 1500 rpm will miss-feed; one that runs at 25 rpm — the output of a 1/60 ratio worm drive speed reducer — spaces seed accurately. The EP-WPWA-S universal speed reducer is used in grain auger drives, fertiliser distribution systems, and conveyor transfer points across the US Midwest and Brazilian cerrado farming regions because its compact 90-degree geometry fits within the tight implement frames of tractor-mounted and trailed equipment.
Q3. Which worm gear reduction ratio should a European food processing plant engineer select for a belt conveyor running at 15 metres per minute?
The correct ratio depends on the input motor speed and the drive sprocket or pulley diameter on the output shaft — the engineer calculates required output RPM first, then divides input speed by that figure to find the ratio. For a 1400 rpm motor driving a 200 mm diameter pulley at 15 m/min, the required output RPM is approximately 24 rpm, giving a target ratio of roughly 1/58 — closest standard selection in the EP-WPWA-S universal speed reducer range is 1/60.
Q4. Where can an Australian plant engineer find a replacement universal speed reducer that matches WPW series shaft dimensions and mounting bolt patterns?
The WPW series is a standardised housing family manufactured to consistent dimensional specifications across producers — centre distance, shaft diameter, keyway dimensions, and bolt patterns are defined in the standard rather than varying by brand. A replacement universal speed reducer in WPW size 100, for example, will have an A dimension of 322 mm, output shaft diameter of 50 mm, and T×V keyway of 10×4.5 mm regardless of which factory produced the original unit. For Australian plant engineers sourcing a direct drop-in replacement, confirming the size number and ratio from the nameplate of the existing unit is sufficient to specify a compatible EP-WPWA-S universal speed reducer without requiring on-site measurement of every dimension.
Q5. Do worm gears reduce speed effectively enough for slow-speed mixing and agitation applications in South Korean chemical plants?
Yes — worm gears are among the most effective single-stage speed reduction mechanisms for reaching very low output RPM from a standard-speed motor input. At a 1/60 ratio, a 1400 rpm motor produces roughly 23 rpm at the output shaft in a single reduction stage, without intermediate gears. For chemical plant mixing and agitation drives in South Korea — where sludge thickening and chemical dosing processes require sustained low-speed torque — the EP-WPWA-S universal speed reducer at size 175 or 200 delivers the combination of low output speed, high torque multiplication, and self-braking resistance that makes it the practical preferred choice over parallel-shaft reducers requiring two reduction stages to reach equivalent output speeds.
Q6. When is worm gear reducer installation best carried out, and what oil fill procedure should maintenance teams in the Middle East follow for hot ambient conditions?
Worm gear reducer installation is best completed before the driven machine is assembled around it — giving access to the mounting bolts and shaft coupling from all sides without obstruction. In hot ambient conditions typical of Gulf state industrial plants (40–50°C), the EP-WPWA-S universal speed reducer sump should be filled with ISO VG 220 or VG 320 mineral gear oil rather than the standard VG 150 recommendation, as higher viscosity compensates for the viscosity reduction that occurs at elevated sump temperatures.
Specify Your EP-WPWA-S Universal Speed Reducer
Tell us your input speed, required output torque, ratio, and shaft direction — we will confirm the correct size and configuration for your application.
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