{"id":1882,"date":"2026-06-26T06:11:31","date_gmt":"2026-06-26T06:11:31","guid":{"rendered":"https:\/\/speed-reducer-gearbox.com\/product\/ea-series-double-worm-gear-reducer\/"},"modified":"2026-06-26T06:11:32","modified_gmt":"2026-06-26T06:11:32","slug":"ea-series-double-worm-gear-reducer","status":"publish","type":"product","link":"https:\/\/speed-reducer-gearbox.com\/en\/product\/ea-series-double-worm-gear-reducer\/","title":{"rendered":"EA Series Double Worm Gear Reducer"},"content":{"rendered":"
\n

EA Series Double Worm Gear Reducer — Ultra-High Ratios<\/h2>\n

When a single worm stage cannot deliver the reduction ratio your process demands, the EA Series steps in with two cascaded worm gear pairs housed in a bolted dual-casing assembly. Total ratios from 200:1 to 900:1 produce extremely low output speeds — as slow as 1.7 r\/min from a standard 1,500 r\/min motor — with output torques reaching up to 9,066 N·m on the largest frame combination. This makes the EA a purpose-built solution for crane travel drives, kiln rotators, heavy gate actuators, and any application where a very slow, very powerful, and inherently self-locking gear reducer<\/strong> is required. Nine frame combinations (WP40–70 through WP155–250) cover inputs from 0.12 kW fractional motors up to 5.5 kW industrial drives, and the foot-mounted housing bolts to a standard machine base without special adapters.<\/p>\n

\"EA<\/div>\n

How Double-Stage Reduction Works<\/h2>\n

Inside the EA, the first-stage worm shaft meshes with a first-stage bronze worm wheel, reducing the motor speed by a factor of 10:1 to 30:1. The first-stage worm wheel shares a common shaft with the second-stage worm, which then meshes with a second bronze worm wheel at an additional 10:1 to 30:1. The total ratio is the product of the two individual ratios: a 15:1 first stage times a 20:1 second stage produces a total 300:1 output ratio. Because both worm sets operate at moderate individual ratios, each stage sits within its peak efficiency band, and the combined self-locking threshold is far lower than what a single stage would need — meaning the EA locks under virtually any load at any of its standard ratios.<\/p>\n

Performance Specifications<\/h2>\n

The table below shows key data for the EA Series at 1,500 r\/min input. Frame combinations pair a smaller first-stage housing with a larger second-stage housing. All units use the same WP-platform worm gear reducer<\/strong> castings, bearings, and worm-wheel alloy found across the single-stage range, so spare parts are interchangeable per frame size. For full dimensional data, contact us<\/a> with your required frame combination and ratio.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n
Frame Combination<\/th>\nInput Motor (kW)<\/th>\nRatio Range<\/th>\nOutput Torque at 300:1 (N·m)<\/th>\nMax Output Torque (N·m)<\/th>\n<\/tr>\n<\/thead>\n
WP40–70<\/td>\n0.12<\/td>\n200:1 – 900:1<\/td>\n88<\/td>\n177<\/td>\n<\/tr>\n
WP60–100<\/td>\n0.37<\/td>\n200:1 – 900:1<\/td>\n276<\/td>\n561<\/td>\n<\/tr>\n
WP80–135<\/td>\n1.5<\/td>\n200:1 – 900:1<\/td>\n880<\/td>\n1,811<\/td>\n<\/tr>\n
WP100–155<\/td>\n1.5<\/td>\n200:1 – 900:1<\/td>\n—<\/td>\n—<\/td>\n<\/tr>\n
WP120–175<\/td>\n2.2 – 3<\/td>\n200:1 – 900:1<\/td>\n2,340<\/td>\n4,463<\/td>\n<\/tr>\n
WP135–200<\/td>\n3 – 4<\/td>\n200:1 – 900:1<\/td>\n—<\/td>\n—<\/td>\n<\/tr>\n
WP155–250<\/td>\n5.5<\/td>\n200:1 – 900:1<\/td>\n4,087<\/td>\n9,066<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Industry Applications<\/h2>\n

Crane and Hoist Travel Drives<\/h3>\n

Overhead bridge cranes and gantry cranes from Demag, Konecranes, and SWF often use double-stage worm reducers on the travel-wheel drive. A WP120–175 EA at 400:1 turns a 1,500 r\/min motor into a 3.75 r\/min output, producing the slow, controlled bridge movement that heavy-lift operations demand. The dual self-locking stages hold the bridge in position the moment the motor stops, without relying on the motor brake alone — an important safety redundancy.<\/p>\n

Rotary Kilns and Dryers<\/h3>\n

Cement kilns, lime kilns, and rotary dryers rotate at 1–5 r\/min under enormous torque loads. The WP155–250 EA generates over 9,000 N·m of continuous output torque — enough to turn a loaded kiln shell through a pinion gear. The industrial gearbox<\/strong> construction of the EA handles the thermal cycling and vibration inherent in kiln-drive environments, and the foot-mounted housing bolts to the concrete drive pedestal alongside the kiln bearing blocks.<\/p>\n

Flood Gates and Dam Sluices<\/h3>\n

Municipal and irrigation dam gates need very slow, very strong drives that hold position without power. The EA’s inherent self-locking at every ratio eliminates the need for a separate gate-locking mechanism. Frame combinations WP80–135 and WP100–155 are commonly specified for gate-leaf widths up to 4 metres, paired with a screw-jack or rack-and-pinion output stage.<\/p>\n

\"Internal<\/p>\n

Dual worm-wheel assemblies and hardened worm shafts<\/p>\n<\/div>\n

Thermal Management and Lubrication<\/h2>\n

Double-stage worm reducers generate more heat than single-stage units because two sliding-contact gear meshes operate in series. For continuous duty above six hours, we recommend a synthetic ISO VG 220 gear oil (such as Mobil SHC 630 or Shell Omala S4 GX 220) to lower operating temperature by 10–20 °C compared with mineral oil. Ensure adequate airflow around both housings — avoid enclosing the EA in an un-ventilated cabinet. The first oil change is at 100 hours; subsequent changes follow a 2,000-hour or annual cycle (shorter than the single-stage 2,500-hour interval) because thermal stress degrades the lubricant faster. Monitor the housing surface temperature during commissioning; a stabilised reading below 95 °C indicates healthy operation.<\/p>\n

\"Worm<\/p>\n

Double-stage reducer assembly and load-testing area<\/p>\n<\/div>\n

Sourcing from Ever-Power Australia<\/h2>\n

Ever-Power Transmission Australia Pty Ltd supplies the EA Series and the motor-flange EDA variant from our Condell Park, NSW warehouse. We carry popular frame combinations in stock and can fulfil custom-ratio orders within 3–4 weeks from our manufacturing base. For applications where helical-gear pre-staging would boost system efficiency, consider pairing the EA with our KM helical-hypoid gearboxes<\/a> line. Reach out via contact us<\/a>, call +61 2 9708 3322, or email sales@speed-reducer-gearbox.com for sizing assistance and quotations.<\/p>\n

Frequently Asked Questions<\/h2>\n
\n1. What ratios does the EA Series cover? +<\/span><\/summary>\n
Standard double-stage ratios start at 200:1<\/strong> and reach 900:1<\/strong>. By cascading two single-stage worm pairs in series, the EA achieves total ratios that no single-stage reducer can match — ideal for extremely slow output speeds of 1–7 r\/min from a 1,500 r\/min motor.<\/div>\n<\/details>\n
\n2. Why are the frame sizes listed as combinations like “WP80–135”? +<\/span><\/summary>\n
A double-stage unit pairs a smaller first-stage housing with a larger second-stage housing. “WP80–135” means the first worm set sits in a WP80 casing and the second in a WP135 casing. The larger second stage handles the multiplied torque at the output.<\/div>\n<\/details>\n
\n3. Is the EA Series self-locking? +<\/span><\/summary>\n
Yes. Both worm stages are individually self-locking at the ratios used in double-stage configurations (each stage typically runs at 15:1 to 30:1). The combined effect makes back-driving virtually impossible under any load condition, providing a passive holding function.<\/div>\n<\/details>\n
\n4. How efficient is a double-stage worm reducer? +<\/span><\/summary>\n
Overall efficiency is the product of the two individual stage efficiencies. At a total ratio of 300:1 (roughly 17:1 × 17:1), expect 55–65 %<\/strong> end-to-end efficiency. The remainder is dissipated as heat, so adequate ventilation or a synthetic lubricant is recommended for continuous duty above six hours.<\/div>\n<\/details>\n
\n5. Can I motorise the EA directly with a flange motor? +<\/span><\/summary>\n
The standard EA uses a foot-mounted input with a coupling or belt connection. If you want a direct motor flange, order the EDA Series<\/strong>, which adds the IEC motor flange to the first-stage input shaft while retaining the same double-stage gear train.<\/div>\n<\/details>\n
\n

Ready to Get Started?<\/p>\n

Call +61 2 9708 3322<\/strong>  |  Email sales@speed-reducer-gearbox.com<\/strong><\/p>\n

Request a Quote<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

The EA Series is a double-stage worm gear reducer that cascades two worm gear pairs in series to achieve ultra-high reduction ratios from 200:1 to 900:1. Nine frame combinations (WP40\u201370 through WP155\u2013250) deliver continuous output torque up to 9,066 N\u00b7m from motors as small as 0.12 kW up to 5.5 kW. Dual self-locking stages hold the output immovably in any position when the motor is off, providing a built-in holding function for crane travel drives, kiln rotators, and heavy gate actuators. This reducer can replace Bonfiglioli VF-EP series and Sew-Eurodrive S..DV double-stage worm reducers with matching housing footprints and IEC input configurations.<\/p>\n","protected":false},"featured_media":1777,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_cat":[2900],"product_tag":[],"class_list":["post-1882","product","type-product","status-publish","has-post-thumbnail","product_cat-double-worm-gear-reducer","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/speed-reducer-gearbox.com\/en\/wp-json\/wp\/v2\/product\/1882","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/speed-reducer-gearbox.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/speed-reducer-gearbox.com\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/speed-reducer-gearbox.com\/en\/wp-json\/wp\/v2\/comments?post=1882"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/speed-reducer-gearbox.com\/en\/wp-json\/wp\/v2\/media\/1777"}],"wp:attachment":[{"href":"https:\/\/speed-reducer-gearbox.com\/en\/wp-json\/wp\/v2\/media?parent=1882"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/speed-reducer-gearbox.com\/en\/wp-json\/wp\/v2\/product_cat?post=1882"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/speed-reducer-gearbox.com\/en\/wp-json\/wp\/v2\/product_tag?post=1882"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}