Description
EDO Series — Vertical-Output Double Worm Gear Reducer
The EDO Series pairs a double-stage worm gear train with a vertical-upward output shaft and an IEC motor flange, creating a purpose-built drive for applications where the load axis runs straight up: sluice gates, vertical screw lifts, overhead trolley hoists, and tilting platforms. Reduction ratios from 200:1 to 900:1 deliver extremely slow, high-torque output — as low as 1.7 r/min from a 1,500 r/min motor — while dual self-locking worm stages hold the load immovably when the motor is de-energised. Five frame combinations from WP40–70 through WP155–250 cover output torques up to 9,066 N·m, giving engineers a compact, coupling-free vertical-drive solution from a single worm gear reducer package.
Vertical-Drive Applications
Dam Gates and Penstock Actuators
Penstock gates on hydroelectric dams and irrigation weirs must lift against water pressure and hold position indefinitely if power is lost. The EDO’s vertical output shaft connects directly to the gate-stem screw, and the dual self-locking worm gearbox stages ensure zero back-drive under any load. Frame combinations WP120–175 and WP155–250 match the torque demands of gate widths up to 4 metres, replacing the motor-coupling-reducer-bevel chain with a single compact unit.
Vertical Screw Lifts and Jacking Systems
Industrial platform lifts, theatre stage elevators, and mezzanine jacking systems require slow, precise vertical motion with absolute position-holding. An EDO at 400:1 or 600:1 converts motor speed into the 2–4 r/min output that screw-jack mechanisms need, while the inherent self-locking eliminates external brakes and simplifies the safety circuit.
Performance Data
Torque values below apply at 1,500 r/min input under continuous duty at 10–25 °C ambient. The EDO shares the same dual WP-platform gear train as the EA and EDA Series. All frame combinations use interchangeable worm wheels and bearings from the standard speed reducer gearbox inventory.
| Frame Combo | Motor (kW) | Ratios | Torque at 300:1 (N·m) | Max 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 |
Dual-housing layout and vertical output shaft orientation
Engineering and Construction
The EDO housing consists of two bolted cast-iron casings — a smaller first-stage unit and a larger second-stage unit — with the second-stage output bore machined vertically upward. The first stage carries a B5/B14 IEC motor flange for direct motor connection. Both stages use case-hardened 20CrMnTi alloy-steel worm shafts and centrifugally cast tin-bronze (ZCuSn10Pb1) worm wheels. Tapered roller bearings support both shafts in each stage, and double-lipped NBR oil seals on every shaft penetration prevent lubricant loss even in the vertical-output orientation where the lower seal sits under a column of oil.
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. For double-stage models, each stage has its own worm pair and bearing set, so you can service one stage without disturbing the other.
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
Maintenance and Lubrication
Use ISO VG 220–320 EP gear oil for ambient temperatures up to 40 °C; switch to synthetic ISO VG 220 (Mobil SHC 630 or Shell Omala S4 GX 220) for continuous duty above six hours. Because the output points upward, the second-stage housing requires a higher oil fill than horizontal installations — consult the frame-specific fill chart in the installation manual. First oil change at 100 hours, then every 2,000 hours or annually. Inspect both magnetic drain plugs for metal particles at each service interval.
Customer Reviews
We fitted four EDO units on our bin-gate actuators two years ago. Not a single seal leak or gear issue since commissioning. The vertical output saved us from adding a separate right-angle coupling stage.
Mark Henderson
Maintenance Manager, NSW Quarry
The self-locking function is exactly what we needed for our vertical screw-lift platforms. Load holds rock-solid with the motor off. Ordering spares from Ever-Power was straightforward and fast.
Yuki Tanaka
Plant Engineer, Food Processing Co.
Good value for the torque output. We use the WP120–175 combo on our sluice-gate drives. Delivery to regional Victoria took five business days, which was faster than expected.
David Rawlings
Project Engineer, Water Treatment
Source from Ever-Power Australia
Ever-Power Transmission Australia Pty Ltd stocks popular EDO frame combinations at our Condell Park, NSW warehouse for rapid dispatch. Every unit ships with ISO 9001 documentation, factory oil fill, and mounting hardware. We also carry SRV138 worm gearbox for saw machines for specialised cutting-machine drives. contact us or call +61 2 9708 3322 for sizing and quotation.
ISO 9001-certified production and testing facility
