EP-WPDS 0.12 to 15 kW Input Power Single Speed Reducer

Unlike conventional foot-mount worm reducers, the EP-WPDS integrates the motor mounting directly into the reducer housing via a precision-machined IEC-standard flange (LA × LB × LC × LE geometry), with a 4-LZ bolt pattern that locks the motor face securely to the reducer input. This arrangement eliminates the misalignment issues associated with separate motor bases and flexible couplings — the motor shaft engages the worm input bore directly, producing a rigid, compact drive unit that is quicker to install and easier to align than a traditional base-and-coupling setup.

Frame sizes run from 40 through 250 mm center distance, with each size accommodating one or more input power levels reflecting the torque capacity of the worm wheel at that frame. The smallest size 40 handles 0.12 kW; the largest, size 250, accommodates 11.0 kW and 15.0 kW input options. Gear ratios span 1/5 through 1/60 depending on the frame, covering the full range of output speeds useful in packaging, material handling, food processing, and general industrial automation. All six shaft direction configurations (A through F) are available, giving machine designers considerable flexibility in how the worm speed reducer output integrates with the driven equipment layout.

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EP-WPDS Single Speed Reducer — 0.12 to 15 kW Input Power Range

The EP-WPDS is a motor-flanged single speed reducer featuring an integrated IEC flange face on the input side, allowing direct face-mount coupling to a standard electric motor without a separate adapter or coupling hub. Designed for right-angle worm gear reduction across a wide power band, the WPDS series covers input ratings from 0.12 kW through 15 kW across ten frame sizes — making it one of the most versatile motor-coupled single stage speed reducer platforms in this output class.

Technical Specifications — EP-WPDS Series

Full dimensional and performance data for the EP-WPDS single speed reducer series is listed below. Motor flange dimensions (LA, LB, LC, LE, LZ) follow IEC standards. Input hole dimensions (Q, U, T×V) refer to the motor-shaft bore. Output shaft dimensions (LS, S, W×Y) are the reducer output shaft parameters. All dimensions in mm; input power in kW; weight in kg. Scroll horizontally on mobile to view all columns.

Size	Power (kW)	Ratio	A	AB	BB	CC	H	LL	M	N	E	F	G	Z	LA	LB	LC	LE	LZ	Q	U	T×V	LS	S	W×Y	Wt (kg)
40	0.12	—	135	75	74	40	141	60	90	100	70	80	13	10	115	95	140	4	M8	31	11	4×12.8	28	14	5×3	5
50	0.18	—	151	83	97	50	176	80	120	140	95	110	15	12	115	95	140	4	M8	31	11	4×12.8	40	17	5×3	8
60	0.37	—	167	91	112	60	202	90	130	150	105	120	20	12	130	110	160	4	M8	33	14	5×16.3	50	22	7×4	11
70	0.37	1/5	200	109	131	70	238	105	150	190	115	150	20	15	130	110	160	4	M8	40	14	5×16.3	60	28	7×4	17
70	0.75	1/5	200	109	131	70	238	105	150	190	115	150	20	15	165	130	200	4	M10	42	19	6×21.8	60	28	7×4	17
80	0.75	1/10	202	111	142	80	273	120	170	220	135	180	20	15	165	130	200	4.5	M10	48	19	6×21.8	65	32	10×4.5	22
80	1.5	1/15 1/20	202	111	142	80	273	120	170	220	135	180	20	15	165	130	200	4.5	M10	52	24	8×27.3	65	32	10×4.5	22
100	1.5	1/20	225	125	169	100	280	150	190	270	155	220	25	15	165	130	200	4.5	M10	52	24	8×27.3	75	38	10×4.5	38
100	2.2	1/20	225	125	169	100	280	150	190	270	155	220	25	15	165	130	200	4.5	M10	52	24	8×27.3	75	38	10×4.5	38
120	2.2	1/25 1/30	280	148	190	120	334	180	230	320	180	260	30	18	215	180	250	5	M12	63	28	8×31.3	85	45	12×4.5	64
120	3.0	215	280	148	190	120	334	180	230	320	180	260	30	18	180	250	5	M12	63	28	8×31.3		85	45	12×4.5	64
135	3.0	1/40	333	181	210	135	375	202	215	482	250	350	200	290	30	18	215	180	250	5	M12	63	28	8×31.3	95	55	16×6	85
135	4.0	215	333	181	210	135	375	202	215	482	250	350	200	290	30	18	180	250	5	M12	63	28	8×31.3		95	55	16×6	85
155	5.5	1/50	375	202	252	155	448	247	235	541	275	390	220	320	35	21	265	230	300	5	M12	83	38	10×41.3	110	60	18×7	118
175	5.5	1/60	481	262	255	175	600	260	260	310	430	250	350	40	21	265	230	300	5	M12	83	38	10×41.3	110	65	18×7	165
175	7.5	265	481	262	255	175	600	260	260	310	430	250	350	40	21	230	300	5	M12	83	38	10×41.3		110	65	18×7	165
200	11.0	—	543	285	319	200	677	290	360	480	290	390	40	24	300	250	350	6	M16	114	42	12×45.3	125	70	20×7.5	236
250	11.0	—	615	330	385	250	824	350	460	560	380	480	45	28	300	250	350	6	M16	114	42	12×45.3	155	90	25×9	396
250	15.0	—	615	330	385	250	824	350	460	560	380	480	45	28	300	250	350	6	M16	114	42	12×45.3	155	90	25×9	396

All dimensions in mm. Input power in kW. Weight in kg. Multiple power options share housing dimensions where shown. Specifications subject to factory confirmation for non-standard configurations.

Five Key Advantages of the EP-WPDS Single Speed Reducer

① Integrated Motor Flange — No Coupling Required

The machined IEC flange input face accepts a standard motor directly, cutting installation time and eliminating the alignment procedure that external coupling setups demand. This is particularly beneficial in high-volume OEM assembly environments where building a single speed reducer into a machine line needs to be fast, repeatable, and free of field alignment variables.

② Six Shaft Direction Options (A–F)

With shaft direction configurations A through F — including dual-input options — the WPDS accommodates a wider range of machine layout orientations than most standard single stage right-angle worm-gear speed reducers. This eliminates the need for direction-change sprockets or additional right-angle gear pairs in complex machine frames where motor placement is constrained.

③ Wide Input Power Coverage

A single product series covering 0.12 kW through 15 kW lets procurement teams standardize on one worm gear reducer platform from small auxiliary drives through to medium-power production machinery. Multiple power options within the same frame size — for example, 0.75 kW and 1.5 kW both fitting the size 80 housing — add further flexibility for system designers working across machine variants.

④ Compact Drive Train Footprint

Eliminating the coupling and motor support base from the drive train produces a significantly shorter overall axial length compared to a conventionally mounted worm gear speed reducer and separate motor assembly. This space saving is directly usable in compact machine frames — common in packaging, labeling, and conveyor equipment where machine width is constrained by production line width standards.

⑤ Direct Foot-Mount Base

Standard foot-mount base with 4-bolt Z pattern allows the WPDS to be bolted directly to a machine frame or base plate — the same mounting approach used by conventional foot-mount reducers, so existing machine structures need no modification. Combined with the flange-input motor mounting, the WPDS provides a complete speed reducer worm gearbox installation in a single bolt-up operation per side.

How the WPDS Single Speed Reducer Works

At its mechanical core, the EP-WPDS operates on the same worm-and-wheel principle shared by all right-angle single reduction worm reducers: a helically threaded worm shaft meshes with a bronze worm wheel, converting high-speed rotary input into lower-speed, higher-torque output at a 90° change of shaft direction. The ratio is determined by the number of worm wheel teeth divided by the worm's lead (number of thread starts). At 1/5, the worm has five starts and the wheel 25 teeth. At 1/60, a single-start worm drives a 60-tooth wheel — all within the same basic housing geometry.

What makes the WPDS distinct is how the input is introduced. Rather than a conventional input shaft projecting from the housing for coupling to a separately mounted motor, the WPDS presents a machined IEC flange face — the register diameter (T dimension), bolt pattern (4-LZ holes), and central bore (Q dimension) are all machined to IEC standard tolerances. The motor's own output shaft inserts through the central bore and engages the worm shaft via a precision fit, with the motor face bolted directly to the reducer flange. The result is a rigid, concentric motor-reducer assembly that needs no separate alignment procedure and maintains correct worm-shaft bearing preload because the motor weight is transferred directly into the reducer housing structure rather than hanging from a coupling.

This configuration is particularly suited to applications where a single speed worm gear reducer needs to be installed and commissioned quickly — a common requirement in food and beverage plants, packaging OEM lines, and pharmaceutical processing equipment in regulated production environments across Europe, Australia, and North America.

Materials & Engineering Standards

The housing of each EP-WPDS single speed reducer is cast from high-grade grey iron (HT250 specification), selected for its combination of dimensional stability, vibration damping, and machinability. The motor flange register — the critical dimension that determines motor centering accuracy — is finish-machined after casting to maintain a running clearance fit tolerance that ensures motor shaft and worm input bore remain concentric within the limits required for smooth, vibration-free operation. On frame sizes from 200 upward where motor weight increases significantly, the flange bolt pattern steps up to M16 fasteners (versus M8/M10/M12 on smaller frames) to handle the elevated cantilever load from the motor mass.

The worm shaft is produced from 20CrMnTi alloy steel, carburized and case-hardened to HRC 58–62 surface hardness, with a tough ductile core retained through controlled heat treatment cycling. Ground thread flanks on the worm ensure a consistent tooth-contact pattern across the full face width of the bronze worm wheel. The worm wheel itself is centrifugal-cast from phosphor bronze (CuSn10P) — a material that provides the low sliding-friction coefficient critical in worm drives, where the tooth contact is predominantly sliding rather than rolling. This combination of a hard worm and a softer bronze wheel means the wheel acts as the planned wear component: easily inspected and replaced without affecting housing or shaft serviceability.

Input bore dimensions (Q, U, T×V in the specification table) correspond to standard IEC motor shaft diameter and keyway series, covering the range from 11 mm (M8 flange, size 40) up to 42 mm (M16 flange, size 250). This compliance with IEC motor shaft standards means the EP-WPDS accepts motors from any IEC-compliant manufacturer worldwide — a significant advantage for customers in markets where specific motor brands or local certifications are required, including CE-marked motors for European installations or CSA-approved motors for Canadian industrial projects.

Application Scenarios

The direct motor-flange design of the EP-WPDS makes it a natural fit for applications where integration compactness, fast assembly, and IEC motor compatibility are all required simultaneously. The following scenarios represent the sectors where WPDS units are most commonly deployed.

Automated Packaging Lines

Filling stations, capping heads, and labeling turntables in UK and European packaging lines demand compact, easily serviced single speed reducer units that mount flush to the machine frame. The WPDS integrates a complete motor-reducer assembly in minimal axial space, and the standardized IEC flange allows motor replacement in the field without realigning the reducer — a key advantage in high-uptime production environments.

Food Processing Conveyors

Slat-band conveyors, spiral coolers, and product-transfer belts in Australian and Canadian food processing facilities use the WPDS for its sealed housing and straightforward maintenance profile. The direct-flange motor connection eliminates the exposed flexible coupling that can trap food debris in open conveyor environments, simplifying both cleaning and sanitation compliance.

Agricultural Machinery Auxiliaries

Seed metering drives, fertilizer spreader discs, and irrigation pivot motor drives in agricultural equipment frequently use a worm reducer motor assembly where compact size and weatherproof housing are mandatory. The WPDS sealed oil-bath construction and foot-mount base handle the vibration and environmental exposure typical of field equipment duty cycles in South American and Southeast Asian agricultural markets.

Pharmaceutical & Laboratory Equipment

Mixing vessels, reactor drives, and dispensing pumps in pharmaceutical facilities require a single speed worm gear reducer that accepts precisely specified IEC motors (often with ATEX or clean-room requirements) without custom machined adapters. The WPDS flange interface accommodates these specialty motors on the same housing used for standard industrial applications — simplifying validation documentation for FDA or EMA regulated facilities.

Textile & Printing Machinery

Warp beam drives, fabric tensioning rolls, and ink metering pumps in textile and commercial printing plants across France, South Korea, and Southeast Asia rely on the low-noise worm mesh to deliver smooth, jitter-free output speed that prevents product quality issues. The WPDS motor-direct configuration also reduces the machine noise floor compared to belt-and-coupling alternatives — an important factor in multi-shift textile mill environments.

Gate, Valve & Actuator Drives

Automated gate actuators, valve stem drives, and positioning turntables use the WPDS at high ratios (1/40–1/60) where the worm drive's back-driving resistance eliminates the need for a separate position-holding brake. For municipal infrastructure and industrial plant automation projects in Brazil and the Middle East, this passive position-locking characteristic is a direct cost saving in the actuator drive system design.

About Our Manufacturing Operation

With more than a decade of hands-on experience in mechanical power transmission, our engineering and production team has built substantial depth across a broad product range. We design and produce agricultural gearboxes, worm gear reducers, planetary gear drives, power take-off shafts, hydraulic cylinders, gears, chains, and motors — entirely within our own manufacturing facility, with full control over materials, machining processes, and quality verification at each stage.

Our facility holds ISO 9001:2015 certification, and production covers a comprehensive range of standard and non-standard gearboxes and assemblies in ductile iron, cast iron, cast steel, precision cast steel, and cast aluminum. We manufacture gears, sprockets, worm gears, pulleys, worms, shafts, and precision mechanical components to both catalogue specifications and custom OEM drawings. As a direct source rather than a trading intermediary, we can respond to customized single speed reducer requests — modified shaft dimensions, special coatings, altered mounting patterns — without the lead time or cost overhead of a third-party sourcing chain.

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Related Products

The EP-WPDS accepts standard IEC motors and fits into a broader drive system that we supply from a single source. Pairing the reducer with a matched motor or a compatible gearbox variant from our catalogue eliminates interface uncertainty and simplifies spare parts management across your machine fleet.

Electric Motors

Our electric motors are produced to IEC frame dimensions and cover the complete shaft diameter and keyway range that the WPDS input bore series accommodates — from 11 mm at size 40 through 42 mm at size 250. Specifying the motor and worm reducer motor assembly together from our facility means the register fit, keyway dimensions, and shaft length are verified against each other before shipment, eliminating the trial-and-error that can occur when sourcing reducer and motor separately.

Complete Worm Gearbox Range

The WPDS sits alongside the WPA, WPS, WPX, WPO, and NMRV series in our broader worm gearbox portfolio. If your application requires a different mounting configuration — standard foot-mount without flange input, hollow-shaft output, or a compact NMRV worm reducer for very tight spaces — our range provides an appropriate match. All series use the same bronze wheel and hardened worm architecture and are available as premium worm reducer variants with synthetic gear oil for extended service intervals in high-temperature or high-cycle duty applications.

Frequently Asked Questions

What makes the WPDS single speed reducer different from a standard foot-mount worm gearbox when building a compact packaging machine line in the UK?

The WPDS integrates an IEC motor flange directly into the reducer housing, allowing the motor to bolt face-to-face onto the reducer without a separate coupling, coupling guard, or motor support base. In a UK packaging machine layout where machine width is constrained by line spacing standards, this configuration cuts the axial drive train length by typically 80–120 mm compared to a conventional foot-mount reducer and separate motor. It also eliminates motor alignment as a field service procedure — the flange register self-centres the motor on the worm input bore automatically.

Which input power level and gear ratio should I specify for a seed metering drive on an Australian broadacre seeder running a 0.75 kW motor at 1450 rpm?

For a 0.75 kW, 1450 rpm input on an Australian broadacre seeder, the WPDS size 80 is the appropriate starting frame — it accommodates 0.75 kW input and offers ratios of 1/10 and 1/15. The correct ratio depends on the target metering disc speed: at 1/10 the output is approximately 145 rpm; at 1/15 approximately 97 rpm. Most broadacre seeder metering systems run between 40–100 rpm at operating speed, so the 1/15 ratio is typical. For demanding field duty with high vibration and ingress risk, specifying IP55 motor protection and checking the lubricant grade for the ambient temperature range encountered in southern Australia is also recommended.

How do I correctly install and align a WPDS worm gear speed reducer with a direct-coupled motor for a Brazilian food processing conveyor application?

Installation begins by verifying that the motor's output shaft diameter and keyway match the WPDS input bore dimensions (Q, U, T×V) listed in the specification table for the selected frame size. Slide the motor shaft into the input bore, engage the key, and bring the motor face squarely up to the flange register. Tighten the flange bolts evenly in a cross pattern to the specified torque for the bolt grade and size. No further alignment is needed — the register diameter controls concentricity. After installation, check that the output shaft rotates freely by hand before energizing, and confirm the oil fill level is at the correct mark for the chosen mounting orientation.

What are the main disadvantages of using a worm gear reducer in a high-duty-cycle Canadian industrial conveyor application running continuously at full load?

The primary limitation is mechanical efficiency. A single reduction worm reducer at ratios of 1/20 or higher typically delivers 70–80% mechanical efficiency, meaning 20–30% of the motor's input power is dissipated as heat at the worm mesh. In a Canadian industrial conveyor running continuously at full load, this efficiency shortfall increases both operating energy cost and thermal load on the lubricant, requiring more frequent oil monitoring in high-ambient or poorly ventilated installations. For very high duty cycles where energy efficiency is the dominant design criterion, a helical or bevel-helical reducer may offer a better life-cycle cost — but the worm reducer's self-locking characteristic, compactness, and lower up-front cost remain compelling for intermittent or moderate-duty conveyor applications.

Where can an OEM in France source a customized WPDS single speed reducer with a modified output shaft length for a pharmaceutical mixing vessel drive application?

As a direct manufacturer, we handle customized single speed reducer requests including extended output shaft lengths, modified bore diameters, and non-standard keyway profiles. For a French pharmaceutical OEM application, we can supply WPDS units with extended S-dimension output shafts that clear the vessel mounting structure, and can provide material certificates and dimensional inspection reports to support the equipment validation documentation required under EMA-regulated manufacturing environments. Submit your shaft length requirement alongside the frame size selection and required output torque, and our engineering team will confirm feasibility and lead time without additional tooling charges for most standard customizations.

When should I choose the WPDS single speed reducer over an NMRV worm reducer for a compact gate actuator drive in a South Korean industrial automation project?

The NMRV is the right choice when envelope size is the overriding constraint — it uses an aluminum alloy housing and is typically 30–40% lighter than a cast iron WPDS at the same frame size, making it preferable for lightweight or panel-mounted actuator installations. The WPDS is more appropriate when input power exceeds 0.75 kW, when the application involves impact or shock loading that benefits from cast iron housing rigidity, or when the customer requires a direct IEC flange-mount interface to a specific motor frame. For South Korean industrial automation gate drives at larger motor sizes (1.5 kW and above), the WPDS is generally the more robust and dimensionally stable choice.

Editor: PXY