WDK Series Worm Gear Reducer_0029_01

WDK Series worm gear reducer

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Description

The WDK Series worm gear reducer closes the one gap the W family previously left open: a genuinely zero-coupling hollow-bore unit within the W-series dimensional convention, where the IEC B5 motor flange on the input face completely replaces the through-shaft — not as an addition to it — and the hollow bore output seats directly onto the driven shaft with no output coupling required. Where the FCWK retains a shaft extension on the non-flange input side (providing secondary access for an encoder or hand-wheel), the WDK eliminates that shaft entirely: the housing input face is a clean IEC flange, the output face is a clean hollow bore, and there are no external rotating shaft elements anywhere on the unit except where they interface with the driven machine. For Australian plant engineers in Sydney, Melbourne, Brisbane, Perth, and Adelaide who operate W-convention machinery and need the maximum coupling elimination — without the through-shaft configuration of the FCWK — the WDK is the correct specification. Covering sizes 50–155, input powers 0.18–5.5 kW, bore diameters Ø20–Ø70 mm, and ratios 10:1–60:1. Manufactured to ISO 9001:2015, designed per AGMA 6034, and supplied by Ever-Power Worm Gear Reducer Co., Ltd. (Australia), 27 Harley Crescent, Condell Park NSW 2200.


WDK worm reducer range and applications Ever-Power Australia
WDK worm reducer complete assembly with motor flanged and shaft-mount output

Technical Specifications — WDK Series Worm Gear Reducer

All parameters per ISO 9001:2015, AGMA 6034, and IEC 60034-7. Bore H7/DIN 286. IEC B5 flange machined concentric with worm shaft to 0.03 mm TIR.

Size Power (kW) Ratio A (mm) B (mm) H (mm) HL (mm) Flange LZ (mm) Input Pilot Ø Q (mm) Bore Ø S (mm) Weight (kg)
50 0.18 10:1–60:1 165 107 150 35 140 25 Ø20 7
60 0.37 10:1–60:1 185 117 177 42 160 35 Ø25 11
70 0.37–0.75 10:1–60:1 209 131 215 55 160–200 35–45 Ø30 14
80 0.75–1.5 10:1–60:1 242 144 250 65 200 45 Ø35 22
100 1.5 10:1–60:1 310 175 310 80 200 55 Ø40 36
120 2.2–3.0 10:1–60:1 361 200 370 95 250 65 Ø45 63
135 3.0–4.0 10:1–60:1 412 212 425 105 250 65 Ø60 80
155 5.5 10:1–60:1 442 312 461 103 300 85 Ø70 114

What Makes the WDK Different from FCWK and WPDKA?

Feature FCWK (W family) WDK (W family) WPDKA (WP family)
Input IEC flange + secondary shaft stub IEC flange only — no shaft extension IEC flange only
Output Hollow bore (W-class) Hollow bore (W-class) Hollow bore (WP-class bore Ø)
Secondary input access Yes — encoder/hand-wheel possible No — cleanest housing envelope No
Bore Ø (size 100) Ø40 mm (W-class) Ø40 mm (W-class) Ø40 mm (WP-class)
Dimensional convention W series W series WP/IEC series
Choose when Need IEC flange + encoder/hand-wheel access Need cleanest zero-coupling W-convention unit WP/IEC convention, IEC flange + hollow bore

WDK worm reducer IEC flange input face and hollow bore output detail
WDK worm gear reducer full range sizes 50 to 155

How to Select the WDK — Step-by-Step Guide

  1. Confirm W-convention bore requirement: WDK bore diameters (Ø20–Ø70 mm) follow the W series convention — the same bore diameters as the WA/WS at equivalent frame sizes. If your driven shaft is sized to a W-convention bore, specify WDK. If your shaft is sized to a WP-convention bore (e.g., Ø40 mm at size 100), which matches the WPDKA, also check — at size 100 the bore diameters are the same (both Ø40 mm). Confirm by measuring your existing bore before ordering.
  2. Confirm IEC motor frame: The WDK input flange (LZ dimension) accepts standard IEC B5 motor frames. Typical pairings: WDK-60 → 63B5; WDK-80 → 71B5, 80B5; WDK-100 → 90B5; WDK-120/135 → 112B5; WDK-155 → 132B5. Provide your motor’s IEC frame designation to Ever-Power for confirmed compatibility.
  3. Calculate torque and frame size: WDK rated output torques follow the W-series convention at each frame size. Apply service factor (SF 1.25–2.0) and select accordingly.
  4. Check bore engagement: Confirm shaft engagement length ≥ 1.2 × bore Ø (minimum per DIN 6885). WDK bore depths (HL) are comparable to WA-class at each frame. For shock loads requiring deeper engagement, enquire about a WDKS variant (WDK + WS-class deep bore) — contact Ever-Power for availability.
  5. Installation sequence: Mount WDK on driven shaft first (bore engagement), then connect torque arm to machine frame, then bolt IEC motor to input flange. Oil fill before first start.

Accessories We Also Supply: W-family torque arm kits (WDK-specific), shrink disc assemblies (Ø35+ bores), motor support brackets (frame 100+), IEC adaptor rings for non-standard motor frames, and DIN 6885 parallel keys. Contact Ever-Power Australia.

WDK Applications in Australian W-Convention Machinery

  • Legacy machine IEC motor upgrades (all states): W-convention machinery that previously used WA or WS with coupled motors can be upgraded to WDK when IEC motor direct mount is desired — the WDK’s W-series bore dimensions match the existing driven shaft, and the IEC flange replaces the coupling at the motor side.
  • Compact packaging and conveyor drives (Sydney, Melbourne): WDK at sizes 60–80 for W-convention conveyor and packaging line shaft drives where the cleanest possible installation is required — no coupling housing, no coupling guard, no shaft extension on the motor side of the housing.
  • Food processing mixer shaft drives (Brisbane, Adelaide): WDK at sizes 80–120 on agitator and ribbon-blender shaft drives in W-convention food machinery where IP65 IEC motors must mount directly and the hollow bore output passes directly over the agitator shaft — zero external coupling surfaces for AS/NZS 4696 food safety compliance.
  • Agricultural shaft drives (QLD, NSW, SA): WDK at sizes 70–100 on W-convention implement drives where compact drive geometry and IEC motor compatibility are both required and through-shaft secondary access is not needed.
WDK worm reducer range and applications Ever-Power Australia

What Australian Customers Say About the WDK Series

★★★★★

“WDK 100 replaced WA 100 units in our Sydney food plant — matched the W-convention bore dimensions exactly and eliminated the input coupling. Motor swap went from 2 hours to 20 minutes. The clean housing with no shaft extension on the back is exactly what we needed for the tight machine envelope.”

— Lisa P., Engineering Manager, Sydney NSW

★★★★★

“WDK 80 on our Brisbane packaging conveyor shaft drives. IEC 80B5 brake motor flanges straight on, conveyor shaft into the Ø35 bore. Zero external couplings in our W-convention machine. IP65 motor plus WDK passes our food safety audit. 18 months without issues.”

— Nathan B., Production Engineer, Brisbane QLD

★★★★☆

“WDK 120 for our Melbourne W-convention grain conveyor upgrade — needed IEC motor direct mount and the W-convention Ø45 bore. Clean, compact installation. 4 stars only because I needed the WDKS variant (deeper bore) which required a 3-week lead time. Standard WDK bore depth was fine for this application though.”

— James C., Conveyor Engineer, Melbourne VIC

★★★★★

“WDK 135 at 40:1 on our SA grain auger drive. IEC 112B5 motor flanges straight on, Ø60 W-convention bore over the auger shaft. The WDK matched our W-family housing dimensions perfectly — no machine modification. Ever-Power’s technical team confirmed the bore compatibility before we committed. Excellent support.”

— Bruce P., Agricultural Engineer, SA Riverland

Why Choose Ever-Power for WDK Worm Reducers in Australia?

Ever-Power Worm Gear Reducer Co., Ltd. (Australia) at 27 Harley Crescent, Condell Park NSW 2200 stocks WDK units across common frame sizes for 5–10 business day dispatch. We confirm IEC flange compatibility and W-convention bore diameter match in one written recommendation. Visit About Us and worm-gearbox.top.

Frequently Asked Questions — WDK Series Worm Gear Reducer

1. Why does the WDK not have a secondary shaft extension on the non-flange input side?+
The WDK is specifically designed for applications where the cleanest possible housing envelope is required — no rotating shaft elements on the motor-side housing face beyond the IEC flange bore itself. In the WDK, the worm shaft terminates inside the housing at the IEC flange face: the motor shaft enters the flange bore and drives the worm shaft directly via a half-coupling or direct key-and-keyway connection inside the flange engagement. There is no secondary stub shaft extension, which means no secondary encoder or hand-wheel can be attached to the WDK input side. If secondary input access is required, specify FCWK (which retains a shaft stub on the non-flange side).
2. Is WDK bore Ø identical to WPDKA bore Ø at the same frame number?+
At sizes 60–100, WDK and WPDKA bore diameters happen to be the same value (e.g., both Ø25 mm at size 60, both Ø40 mm at size 100). However, the housing external dimensions differ between W-convention (WDK) and WP-convention (WPDKA), so the units are NOT interchangeable for legacy machine replacement — the mounting bolt pattern, foot-mount base dimensions, and housing height differ. At size 50, WDK bore is Ø20 mm while WPDKA bore is also Ø20 mm; at size 135, WDK bore is Ø60 mm and WPDKA bore is also Ø60 mm. Despite matching bore diameters at many frame sizes, confirm the housing external dimensions and mounting pattern before substituting one for the other on an existing machine.
3. Does the WDK include a torque arm, and which frame of torque arm fits it?+
A standard WDK-specific torque arm kit is included with every WDK unit as standard. The torque arm attachment bolt pattern follows the W-series housing convention — it is NOT the same as the WP-family torque arm and the two must not be substituted. The WDK torque arm is rated for the full WDK output torque at each frame size. Stainless steel torque arm kits for food/washdown environments are available as an option for WDK sizes 60–155 at time of order. For motor frame sizes 100+ (motor weight ≥20 kg), a motor support bracket is recommended as an additional accessory to prevent resonant vibration at the IEC flange under motor weight.
4. What is the self-locking behaviour of WDK at different ratios?+
WDK worm mesh is self-locking at ratios 20:1 and above (worm lead angle ≤ approximately 6°). At these ratios, the output bore and driven shaft hold their position without power — the static self-locking torque is approximately equal to the rated output torque. At ratios 10:1 and 15:1, the mesh is not reliably self-locking and a separate mechanical brake is required for gravity-loaded or positioning applications per AS 4024. The IEC motor flange on the WDK makes IEC brake motor selection straightforward — an IEC brake motor bolted to the WDK flange provides both motor torque and mechanical braking in a single compact unit without any additional hardware.
5. Can WDK be ordered with a shrink disc for the output bore?+
Yes — shrink disc engagement is available for WDK bore sizes Ø35 mm and above (sizes 80–155). A shrink disc provides zero-clearance, zero-backlash engagement and generates a friction torque capacity 20–30% higher than a keyed connection, while completely eliminating bore fretting by removing the micro-movement that causes it. For WDK applications with shock loading or reversals (conveyor head shafts, reversible mixer drives), the shrink disc option is strongly recommended. Specify at order time with the driven shaft diameter — Ever-Power supplies the matched shrink disc for all WDK bore sizes.

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