DKS Series (WPDKS) worm gear reducer

DKS Series (WPDKS) worm gear reducer

The DKS Series (WPDKS) represents the most comprehensive specification within the WP family for heavy-duty, hollow-shaft units featuring a coupler-free design. It features an IEC B5 flange input (without an input coupling), a WPS-class deep hollow-shaft output (130–435 mm, without an output coupling), and incorporates tapered roller bearings starting from size 80. The series covers sizes 50 through 175, with speed ratios ranging from 10:1 to 60:1.

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Description

The DKS Series (WPDKS) worm gear reducer is the WP family’s definitive coupling-free heavy-duty shaft-mount specification — combining an IEC B5 motor-mounting flange (no input coupling) with a WPS-class deep hollow bore output and tapered roller output bearings from size 80 upward. No other WP-family single-stage worm reducer eliminates couplings at both interfaces while simultaneously providing the WPS-class bearing arrangement — making the WPDKS the correct specification whenever an IEC-frame motor must mount directly to the reducer and the driven shaft carries shock, chain tension, or heavy reversing loads that would exceed the WPDKA’s output bearing capacity. Covering sizes 50–175, input powers 0.18–7.5 kW, bore diameters Ø20–Ø80 mm, and ratios 10:1–60:1, the WPDKS is stocked and dispatched in 5–10 business days throughout Australia from Ever-Power Worm Gear Reducer Co., Ltd. (Australia), 27 Harley Crescent, Condell Park NSW 2200.

Technical Specifications — DKS Series (WPDKS)

★ = tapered roller output bearing. Bore tolerance H7/DIN 286. All per ISO 9001:2015, AGMA 6034, and IEC 60034-7.

Size Power (kW) Ratio A (mm) B (mm) H (mm) HL (mm) Flange LA (mm) Bore Ø (mm) Weight (kg)
50 0.18 10:1–60:1 155 107 180 130 115 Ø20 8
60 0.37 10:1–60:1 170 117 205 150 130 Ø25 10.5
70 0.37–0.75 10:1–60:1 206 131 235 175 130 Ø30 17
80 ★ 0.75–1.5 10:1–60:1 232 144 265 200 165 Ø35 26
100 ★ 1.5 10:1–60:1 266 175 327 250 165 Ø40 38
120 ★ 2.2–3.0 10:1–60:1 340 200 388 300 215 Ø45 60
135 ★ 3.0–4.0 10:1–60:1 375 212 445 350 215 Ø60 85
155 ★ 5.5 10:1–60:1 442 312 483 390 265 Ø70 120
175 ★ 7.5 10:1–60:1 465 334 550 435 265 Ø80 150

Four Defining Features of the WPDKS — Why It Stands Apart

① IEC B5 Motor Flange Input

Motor bolts directly to the housing input face — machined to 0.03 mm TIR concentricity. No coupling, no motor base, no alignment procedure. Motor swap in under 20 minutes.

② WPS-Class Deep Hollow Bore

Bore depths 130–435 mm — 150–250% deeper than the WPDKA at the same frame size. Halves keyway contact stress at equivalent torque. Eliminates bore fretting under shock and reversing loads.

③ Tapered Roller Output Bearing (80+)

From size 80 upward — carries combined radial and axial loads from the torque arm reaction. Maintains bore alignment under variable heavy loading. Extends output bearing L10 life vs ball bearings by 30–40%.

④ Foot-Mount Base (WPS-Class Housing)

Four-bolt foot-mount base provides stable machine positioning while the motor cantilevered on the input flange. WPS-class housing dimensions — wider bearing span than WPDKA for higher bearing life under heavy loads.

WPDKS Installation Workflow — Step-by-Step for Australian Site Engineers

Pre-Installation Checks (before opening the box):

  1. Confirm WPDKS bore Ø matches driven shaft diameter (H7 to h6 fit)
  2. Confirm WPDKS bore depth HL is adequate for your shaft engagement length
  3. Confirm IEC motor flange size matches the WPDKS input flange (same pilot diameter and bolt-circle diameter)
  4. Confirm foot-mount base bolt pattern matches machine base hole pattern

Installation Sequence:

  1. Mount WPDKS on driven shaft first — slide bore over shaft (with key and anti-fretting compound), torque setscrews or install shrink disc
  2. Connect torque arm — bolt bracket to housing, connect pivot pin to machine frame with 3–5 mm free movement
  3. Mount WPDKS to machine base — four foot-mount bolts, confirm level
  4. Mount IEC motor to input flange — four bolts, self-aligning via pilot bore. No dial gauge needed
  5. Oil fill — ISO VG 220 to sight glass centre for your mounting orientation
  6. Run-in — 30 min unloaded, 2 hr at 50% load, full load after

WPDKS IEC flange input deep bore output installation detail
DKS Series (WPDKS) worm gear reducer-2

Replacing SEW-Eurodrive, Bonfiglioli, and Nord with WPDKS in Australia

The WPDKS is dimensionally compatible with competing brands’ IEC-flange + deep hollow bore units at common frame sizes. For like-for-like replacement, confirm the following parameters against the existing unit before ordering:

Original Unit Key Parameters to Match WPDKS Equivalent
SEW-Eurodrive WS-DA (hollow bore, IEC flange) Centre distance, bore Ø, bore depth HL, IEC frame WPDKS at matching centre distance
Bonfiglioli VF-KS (hollow bore + flange) Centre distance, bore Ø, IEC flange frame WPDKS — confirm bore Ø (may differ ±2 mm)
Nord SK compact flange + hollow bore Centre distance, bore Ø, IEC flange, foot-mount WPDKS — confirm foot-mount hole pattern
Motovario TS-DA (flange + hollow bore) Centre distance, bore Ø, HL depth, foot pattern WPDKS — confirm all four parameters

Provide Ever-Power with the nameplate data (centre distance, bore Ø, IEC motor frame, bore depth HL) for a confirmed interchange check before ordering. Ever-Power’s engineering team delivers written interchange confirmation within one business day at no charge.

WPDKS Applications — Where Australian Engineers Specify It

  • Chain Conveyor Head Shaft Drives (Sydney, Melbourne, Brisbane): 1.5–3.0 kW IEC 90–112B5 motor flanged directly to WPDKS 100–120 at 20:1–30:1, with the 250–300 mm bore depth accommodating the full chain-loaded head shaft engagement without fretting.
  • Grain Auger Drives (QLD, NSW, SA, WA): WPDKS 80–120 at 20:1–40:1 with 0.75–3.0 kW motors — the IEC motor flanges directly in the grain shed’s confined overhead space, and the deep bore handles stone-strike shock loads that destroy standard WPDKA bores in a single harvest season.
  • Mining Feeder and Screen Drives (WA, QLD): WPDKS 135–175 in Pilbara iron ore and Queensland coal operations where IEC brake motors must mount directly to the reducer (no coupling in dusty underground conditions) and the tapered roller bearings plus deep bore handle sustained shock loading from ore impact.
  • Food Mixer Shaft Drives (Sydney, Adelaide): WPDKS 100 at 40:1–60:1 with IP65 IEC motor flanged direct — zero coupling surfaces for AS/NZS 4696 food safety compliance, and the deep bore handles paddle mixer start-under-load impulses without bore damage.

DKS Series (WPDKS) worm gear reducer-3

What Australian Customers Say About the WPDKS

★★★★★

“WPDKS 120 on our grain auger in SA — the 300 mm bore depth at size 120 handles our stone-strike loads that destroyed two WPDKA units in 14 months. 22 months in, perfect. IEC motor direct mount saves us 45 minutes per motor swap.”

— Lisa B., Agricultural Engineer, Yorke Peninsula SA

★★★★★

“WPDKS 100 on our Brisbane chain conveyor drives — 250 mm bore depth handles the full shaft engagement and chain tension. 16 months without bore fretting. IEC motor flange made installation 70 minutes instead of 3 hours. The Ever-Power engineering team confirmed our selection before we ordered.”

— Brett M., Conveyor Engineer, Brisbane QLD

★★★★☆

“WPDKS 80 on WA vibrating screen shaft drives. Deep bore + tapered rollers handles the shock impact. IEC motor flanges direct — clean installation in confined drive bay. 4 stars as the custom Ø38 bore needed 3 weeks, but standard bores (Ø35) were available same week.”

— Shane O., Site Eng., Pilbara WA

★★★★★

“WPDKS 100 food mixer drives in Sydney. IP65 IEC motor flanges to the WPDKS, mixer shaft into the deep bore. No coupling surfaces. Passed food safety audit first time. The tapered rollers at size 100 handle our start-under-load pudding mix torques without complaint.”

— Michelle R., Plant Engineer, Sydney NSW

Why Specify Ever-Power WPDKS for Your Australian Application?

Ever-Power Worm Gear Reducer Co., Ltd. (Australia) at 27 Harley Crescent, Condell Park NSW 2200 offers: free dual-interface engineering verification (IEC flange + bore engagement) delivered in one business day; WPDKS stock across all nine frame sizes for 5–10 day dispatch; shrink disc assemblies matched to every standard bore; and written interchange confirmations against SEW, Bonfiglioli, and Nord units. Visit About Us. Technical data at worm-gearbox.top.

Frequently Asked Questions — DKS Series (WPDKS)

1. How do I confirm whether my application needs WPDKS vs WPDKA before ordering?+
Send Ever-Power three figures: (1) required output torque in N·m (motor kW × 9,550 / output rpm × efficiency); (2) service factor (1.25 smooth, 1.5 moderate shock, 2.0 heavy shock); and (3) chain or belt overhung force F_OH = (2 × torque) / sprocket PCD. We compare these against WPDKA and WPDKS rated values at your chosen frame size and confirm in writing which unit provides adequate safety margin — at no charge, within one business day.
2. Can WPDKS be used without oil — with grease lubrication?+
No — the WPDKS uses oil bath lubrication for both the worm gear mesh and the tapered roller output bearing (sizes 80+), which share the same sump. Grease lubrication is not suitable as it cannot provide the continuous film renewal and heat dissipation that the worm mesh requires under sustained load, and cannot carry the combined axial and radial loads on the tapered roller bearing at operating temperature. Always fill with ISO VG 220 mineral or synthetic oil before first start. For mounting orientations other than horizontal input shaft, consult the oil fill orientation guide supplied with each unit, or contact Ever-Power for your specific mounting orientation oil port location.
3. What is the minimum bore engagement for WPDKS 100 at Ø40 mm bore?+
Minimum bore engagement per DIN 6885 key engagement guidelines is 1.2 × bore diameter = 1.2 × 40 = 48 mm for WPDKS 100 Ø40 mm bore. The WPDKS 100 bore depth HL is 250 mm — so the driven shaft can engage anywhere from the minimum 48 mm to the full 250 mm depth. Maximum fretting resistance is achieved at full depth engagement. If your shaft only protrudes 80–100 mm from the machine face, the WPDKS 100 still provides 2× the minimum engagement ratio — significantly better than the WPDKA 100 whose HL of 100 mm at full engagement equals only 2.5× minimum, while the WPDKS at 250 mm provides 6.25× minimum engagement.
4. Does the WPDKS torque arm come included with purchase?+
Yes — a standard WPS-class torque arm kit (bracket, rubber bush pivot, and M10/M12 pin) is included with every WPDKS unit as standard. The torque arm is pre-assembled and rated for the full WPDKS output torque at each frame size. For WPDKS units requiring a stainless steel torque arm (food/washdown applications), specify “stainless torque arm” at time of order — available for sizes 70–155. For motor frame sizes 100+ where motor weight may cause resonant vibration at the flange, specify a motor support bracket as an additional accessory — this is not included as standard but is stocked by Ever-Power for all WPDKS frame sizes.
5. What is the WPDKS warranty and what does it cover in Australian conditions?+
Ever-Power provides a 12-month warranty against manufacturing defects in materials and workmanship from date of dispatch for all WPDKS units supplied through the Australian office. The warranty covers worm gear mesh failures, casting cracks, bearing failures due to manufacturing defects, and dimensional non-conformance confirmed by inspection. It does not cover failures resulting from incorrect selection (overloading beyond the rated torque or bore engagement design limit), incorrect oil type or level, ambient temperature exceeding the stated thermal rating, bore fretting on standard-keyed units subjected to shock loads beyond the service factor used in selection, or modifications made to the unit in the field. Contact Ever-Power Australia with the unit serial number and failure description for warranty assessment.

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