EP-ZDE Series Round-Flange Precision Planetary Gearbox — Low Backlash Servo Gearbox

Ο EP-ZDE series precision planetary gearbox for servo motor coupling from Korea Ever-Power is engineered for direct servo motor integration in Korean CNC machining centres, industrial robots, laser cutting systems, semiconductor handling equipment, and automated assembly lines. This πλανητικός μειωτήρας ταχυτήτων mounts via its round output flange into a standard circular bore on the driven machine structure — the most common installation geometry in Korean OEM servo drive designs — with a cylindrical body diameter of Φ40 to Φ160 mm and four G2 mounting screws on the output face.

Internal gears, planetary gears, and the sunwheel are manufactured from case-hardened alloy steel, ground to h7 output shaft tolerances, assembled with matched-pair angular contact bearings. The factory-sealed lifetime lubrication requires no re-greasing over the 20,000-hour rated service life — approximately 8–10 years of two-shift operation in Korean manufacturing environments.

Three Engineering Advantages of the EP-ZDE Clamping Input

⚠ Installation Cautions: Do not apply external impact or axial force to the output shaft or input flange during installation — use proper pressing tools only. Do not operate with the protective end-cap removed. Rated radial and axial forces are measured at output shaft centre position (L/2); loads applied at the shaft end impose higher effective bearing loads. Never exceed 4,500 rpm input speed. The sealed housing has no grease port — do not attempt external lubrication.

✔ Zero Maintenance Confirmation: EP-ZDE uses factory-sealed lifetime lubrication. No re-greasing, no oil changes, no scheduled lubrication intervals are required over the 20,000-hour rated life. The only recommended periodic check is a visual inspection of the output shaft lip seal every 5,000 hours to confirm no contamination ingress. For storage exceeding 6 months before installation, rotate the input shaft by hand monthly to redistribute the grease.

CNC Machining Centres — Rotary Table & Axis Drives

Korean CNC machining centre OEMs use EP-ZDE-120 at 20:1 two-stage for A- and B-axis rotary table drives and 4th-axis indexing heads. The <8 arcmin single-stage backlash at 100–260 N·m rated torque (120-frame) provides the positioning accuracy required for Korean tier-1 automotive mould and aerospace part machining. For right-angle motor layout requirements in compact machine tool headstocks, see the EP-ZDWE right-angle input series.

Industrial Robots — 6-Axis Joint & SCARA Drives

Korean collaborative and industrial robot manufacturers use EP-ZDE-60 and EP-ZDE-80 for wrist and elbow joint drives. The compact cylindrical body (Φ60–Φ80 mm) integrates directly into the robot arm cross-section. At 0.9–2.1 kg for single-stage units, EP-ZDE contributes minimal link weight while delivering 12–120 N·m rated output torque — covering Korean 5 kg to 20 kg payload collaborative robot joint specifications. The <8 arcmin backlash is compliant with ISO 10218-1 joint positioning requirements for Korean safety-rated collaborative robot cells.

Semiconductor & Display Panel Equipment

Korean semiconductor fab equipment engineers specify EP-ZDE-40 and EP-ZDE-60 for wafer handling robot stage drives and die-bonding arm positioning. At 40 mm frame with 0.4 kg weight, EP-ZDE-40 is the lowest-inertia option in the series — critical for high-acceleration, short-stroke wafer transport cycles. The lifetime-sealed grease passes cleanroom particle contamination tests (ISO 14644-1 Class 7 environment), eliminating the re-lubrication events that require temporary cleanroom tenting around the machine in Korean semiconductor facilities in Hwaseong, Icheon, and Pyeongtaek.

Laser Cutting Systems — High-Speed Gantry Axes

Korean fibre laser cutting system manufacturers use EP-ZDE-80 for XY gantry servo drive axes at feed rates of 60–120 m/min. The 4,500 rpm maximum input speed supports high-speed positioning cycles without the gearbox limiting cycle time. IP54 protection resists metallic particulate and oil mist generated at Korean laser cutting installations. For rack-and-pinion gantry configurations requiring rapid pinion replacement.

Packaging & Food Processing Lines

Korean food and beverage packaging OEMs specify EP-ZDE-60 and EP-ZDE-80 for servo-driven filling, sealing, and labelling axes. The IP54 sealed housing resists cleaning solution splash and food-grade detergent mist in Korean HACCP-certified production environments. Lifetime lubrication eliminates grease leakage contamination risk — a compliance requirement under Korean Food Safety Management certification. At 3-shift operation, the 20,000-hour rated life corresponds to approximately 5–6 years before scheduled replacement.

Electronic SMT Assembly & PCB Drilling

Korean SMT pick-and-place equipment manufacturers use EP-ZDE-40 for Z-axis placement head vertical drive and theta-axis nozzle rotation. The <12 arcmin backlash (40-frame, 1-stage) at 4.5–6 N·m covers standard SMT chip and connector placement accuracy requirements. For PCB drilling machines, EP-ZDE-60 at 3:1 or 4:1 single-stage drives the drill spindle feed axis. Korean PCB manufacturers in Gumi and Changwon report EP-ZDE-60 achieving >20 months continuous operation between scheduled maintenance checks.

• ✔Backlash measured per unit at ±3% of rated output torque — measurement certificate with every order
• ✔Output shaft h7 tolerance dimensional verification — 100% inspection at manufacture
• ✔Full-load torque test — confirmed at rated output torque for each unit before shipment
• ✔IP54 ingress verification per IEC 60529 — every production batch
• ✔Material certificate and dimensional drawing provided with every delivery

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EP-ZDE-120 at 20:1 two-stage, 1,000 W Panasonic motor — A-axis rotary table on a 5-axis machining centre. The previous competitor gearbox showed backlash drift from 10 arcmin to 18 arcmin after 14 months of mould-machining operation. EP-ZDE-120 measured 11 arcmin at installation; the same unit still measures 11.2 arcmin at 22 months of two-shift operation. Korea Ever-Power provided the input flange drawing for our exact motor frame within 4 hours of inquiry — that response speed is rare in this component category. We have now standardised on EP-ZDE across 8 machine models in our current range.

We integrated EP-ZDE-80 (8:1 single-stage) into the elbow joint of a custom 6-axis collaborative robot for Korean automotive door panel assembly. Peak torque requirement was 90 N·m at 0.5 s — covered by the 2× instant stop torque (90 N·m on a 45 N·m rated unit). Now 31 months in production, backlash has not shifted measurably on our ISO 10218-1 quarterly check. The precision clamping input makes our motor swap procedure approximately 40 minutes faster than the keyed competitor gearbox we used previously — a real-world benefit when field-replacing a motor in a running production cell.

EP-ZDE-60, 5:1 single-stage, wafer handling robot theta-axis — 200 mm wafer transfer, ISO 14644-1 Class 7 cleanroom-adjacent installation. Critical requirement was zero grease outgassing and no particle generation. The factory-sealed EP-ZDE-60 passed our particle contamination evaluation during 72-hour continuous operation with zero particles detected attributable to the gearbox. MTBF in our equipment now exceeds 24 months for this axis. The previous open-greased gearbox required a 6-month re-lubrication interval that forced a temporary cleanroom tent around the machine — that cost alone justified the switch to EP-ZDE.

EP-ZDF Series — Square Flange Output

Identical planetary gear stages and torque ratings as EP-ZDE, with a square output flange (D7 = □45–□175 mm) for face-mount installation on a flat plate. Choose EP-ZDF when the gearbox is bolted to a bracket or plate surface rather than inserted into a round bore. Identical backlash, efficiency, IP54 sealing, and lifetime lubrication to EP-ZDE.

EP-ZDWE Series — Right-Angle Input, Round Flange

Right-angle bevel input with round output flange — the servo motor is perpendicular to the output shaft, saving 30–50% of axial installation depth. Use EP-ZDWE when machine tool headstock depth or robot arm cross-section prevents inline motor placement. Available in 60–160 mm frames with the same lifetime lubrication and IP54 sealing.

EP-ZDS Series — High Stiffness, Heavy Load

When EP-ZDE-160 at 800 N·m is not sufficient — EP-ZDS delivers up to 1,800 N·m (190-frame) with IP65 protection, torsional stiffness up to 130 N·m/arcmin, and 28,000 N maximum axial force. Specify EP-ZDS for heavy robot joints, large CNC pallet changers, and high-force servo press applications in Korean tier-1 automotive and heavy industry facilities.

QWhat is the difference between EP-ZDE and EP-ZDF — when should I choose each?

Both EP-ZDE and EP-ZDF use identical planetary gear stages, bearing arrangements, rated output torques, and backlash specifications — they are the same low-backlash planetary gearbox with different output housings. EP-ZDE has a cylindrical round body (D7 = Φ40–Φ160 mm) that inserts into a circular bore in the machine frame, held by 4×G2 screws on the output face — the standard installation method for CNC spindle heads, robot joints, and bore-mounted machine drives in Korean OEM servo drive designs. EP-ZDF planetary gearbox has a square output flange (D7 = □45–□175 mm) with 4 through-bolts that attach directly to a flat mounting plate — preferred for conveyor drives, bracket-mounted actuators, and applications where a flat-face bolted connection is mechanically more convenient than a bore fit.

QCan I mount the EP-ZDE in any orientation without affecting the lubrication or performance?

Yes — the EP-ZDE series planetary reducer can be installed in any orientation: horizontal, vertical shaft-up, vertical shaft-down, inverted, or at any inclined angle. The lifetime lubrication design uses factory-sealed grease, not oil, so there is no oil sump level that changes with orientation. The sealed grease remains uniformly distributed across gear and bearing contact surfaces regardless of mounting angle. This is a key advantage for Korean robot joint drives and inclined conveyor applications where the gearbox orientation changes dynamically or is fixed at a non-standard angle that would require oil level modifications in conventional lubricated gearboxes.

QWhich servo motor brands are compatible with the EP-ZDE input flange?

The EP-ZDE input flange is customised to match the specific servo motor model. Korea Ever-Power provides standard input flanges matched to the most common brands in the Korean and Asian market: LS Mecapion, Panasonic MINAS A6/A5, Yaskawa Σ-7/Σ-V, Mitsubishi HG/HC series, Delta ECMA series, Siemens 1FK7/1FT7, Inovance SV660, and others. Provide the motor model number when ordering and Korea Ever-Power confirms the input flange square size (Q3), motor shaft diameter, and mounting hole pattern before manufacture. Custom flanges for non-standard motors are available with 2–3 business days lead time from drawing confirmation.

QHow do I select the correct EP-ZDE frame size and gear ratio for my application?

Select the frame size from the rated output torque: calculate required output torque = load torque × service factor (1.5–2.0 for dynamic or shock loads). Match this to the rated output torque table for your target gear ratio. Then verify the ratio: divide the motor rated speed by the required output shaft speed. For single-stage (higher efficiency, lower backlash, ratio 3–10), two-stage (higher ratio still <12 arcmin at frames 60–160, ratio 9–64), or three-stage (up to 512:1, ratio 60–512), select accordingly. Korea Ever-Power provides a free ratio selection calculation worksheet in Korean — supply your motor power, speed, load torque, and application type to receive a confirmed frame and ratio recommendation.

QDoes the EP-ZDE require any scheduled maintenance over its 20,000-hour rated life?

No scheduled lubrication maintenance is required. The EP-ZDE πλανητικός μειωτήρας ταχυτήτων uses factory-sealed lifetime grease that lasts the full 20,000-hour rated service life without re-greasing. The housing has no grease nipple, drain port, or oil fill port — do not attempt to add lubricant. The only recommended periodic check is a visual inspection of the output shaft lip seal every 5,000 hours (approximately 2–3 years for two-shift operation) to confirm no contamination ingress into the housing. At the end of the 20,000-hour rated life, replace the gearbox unit — internal component replacement in the field is not recommended.