Description
EWDKO Series — Full-Feature Double Worm Gear Reducer
The EWDKO is the most comprehensively equipped model in the WP double-stage worm reducer family. It combines a universal (multi-angle) first-stage housing, an IEC motor flange for direct motor mounting, a keyed hollow output shaft for coupling-free installation on the driven machine shaft, and a vertical-upward output axis — all in one unit. This full-feature configuration addresses the most demanding layout challenges in gate actuators, vertical screw drives, and overhead positioning systems where the motor angle, driven-shaft connection method, and output direction are all constrained by the surrounding structure. Five frame combinations from WP40–70 through WP155–250, with ratios from 200:1 to 900:1 and output torques up to 9,066 N·m, provide broad coverage across industrial speed reducer gearbox applications.
Applications Requiring Full Flexibility
Complex Penstock and Gate Installations
Large dam gates and flood-control structures often have motor platforms at awkward angles relative to the gate stem. The EWDKO’s universal input accommodates whatever motor angle the civil works dictate, the hollow bore slides directly over the gate-stem shaft, and the vertical output aligns naturally with the lifting axis. Dual self-locking worm gearbox stages hold the gate at any position without power — a critical safety requirement.
Heavy Industrial Turntables
Rail-car turntables, shipyard rotating platforms, and CNC pallet-changer rings rotate massive loads at very low speeds. The EWDKO at 600:1 or 900:1 delivers the necessary torque while the hollow bore connects directly to the turntable king-pin shaft, eliminating the flexible coupling that would otherwise be a maintenance item. Frame combinations WP120–175 and WP155–250 handle the torque requirements of platforms up to 30-tonne capacity.
Specifications
Torque data below applies at 1,500 r/min input under continuous duty. The EWDKO uses the same gear pair geometry and WP-platform castings as the entire double-stage range, maintaining full parts interchangeability with the EA, EDA, EDO, EO, and EWA models. For dimensional details, contact us with your frame combination and shaft orientation.
| Frame Combo | Motor (kW) | Ratios | Torque at 300:1 (N·m) | Peak Torque (N·m) |
|---|---|---|---|---|
| WP40–70 | 0.12 | 200:1 – 900:1 | 88 | 177 |
| WP60–100 | 0.37 | 200:1 – 900:1 | 276 | 561 |
| WP80–135 | 1.5 | 200:1 – 900:1 | 880 | 1,811 |
| WP120–175 | 2.2 – 3 | 200:1 – 900:1 | 2,340 | 4,463 |
| WP155–250 | 5.5 | 200:1 – 900:1 | 4,087 | 9,066 |
Universal input, hollow bore, and vertical output detail
Ordering Workflow
The EWDKO’s many configuration options mean precise specification is important. Follow the four steps below to ensure a correct first-time order.
Analyse the Layout
Map the motor position, driven-shaft axis, and available clearances. The EWDKO adapts to tight, angled installations that standard reducers cannot serve.
Size for Torque & Ratio
Calculate required output torque and speed. Select the frame combination whose rated torque exceeds the load after applying correction factors for duty cycle and ambient temperature.
Specify Orientation
Choose the input angle (A, S, O, X, T, or V) that best fits your motor position. Confirm the hollow-bore diameter matches the driven shaft.
Submit for Quote
Email the full model string and motor details to [email protected]. We confirm availability and pricing within 24 hours.
Components and Spare Parts
Every major component inside this reducer is available as an individual spare part, so a worn gear set or leaking seal never means replacing the entire unit. Our spare-parts inventory covers the full WP-platform range and ships from our Condell Park, NSW warehouse. The EWDKO draws from the same parts pool as all WP-platform reducers. First-stage components match the universal WPW range; second-stage components match the standard WP range by frame size.
Worm Shaft
Case-hardened 20CrMnTi alloy steel, thread-ground to Ra 0.8 μm finish
Worm Wheel
Centrifugally cast ZCuSn10Pb1 tin-bronze, hobbed full-depth involute profile
Bearings
Tapered roller bearings handling combined radial and axial loads on both shafts
Seal & Gasket Kit
Double-lipped NBR oil seals, housing gaskets, breather plugs, and O-rings
Individual components available for order: worm shaft, bronze wheel, bearings, and seal kits
Thermal Management
The EWDKO places the highest thermal demand of any model in the WP range because it combines double-stage heat generation with a vertical output that raises the upper bearing temperature. Synthetic ISO VG 220 gear oil is strongly recommended for all duty cycles. Ensure both housings have adequate airflow — avoid enclosing the unit in un-ventilated cabinets. Monitor housing surface temperature during commissioning; stable operation below 95 °C is acceptable. Oil changes follow a 2,000-hour or annual cycle after the initial 100-hour break-in drain.
Customer Reviews
The EWDKO solved a layout problem we had been wrestling with for weeks. Universal input plus hollow vertical output — no other off-the-shelf reducer offered that combination. Commissioning was seamless.
Andrew Clarke
Design Engineer, Automation Integrator
We specified the WP155–250 combo for a large sluice gate. The hollow bore slid directly onto the gate stem and the universal input let us angle the motor around an existing pipe run. Excellent engineering.
Raj Patel
Senior Engineer, Water Infrastructure
Arrived well-packed and on time. The mounting flexibility is genuinely useful — we repositioned the motor once during install without needing a new gearbox. Would order again.
Tom Brennan
Workshop Foreman, Regional Council
Partner with Ever-Power Australia
Ever-Power Transmission Australia Pty Ltd supplies the EWDKO and every other WP-platform variant from our Condell Park, NSW warehouse. We also carry VRV063 worm gearbox for printing equipment for precision printing and web-tension applications. ISO 9001-certified, factory-tested, and supported by our Sydney engineering team. Call +61 2 9708 3322 or visit our About Us page.
Run-in testing and dimensional verification
