EP-ZDWF Series Right-Angle Input Square-Flange Precision Planetary Gearbox

The EP-ZDWF series right-angle square-flange precision planetary gearbox and servo gear reducer from Korea Ever-Power is the intersection of the EP-ZDWE and EP-ZDF series in a single unit. It carries the right-angle 90° bevel input stage of EP-ZDWE — positioning the servo motor perpendicular to the output shaft to reduce total axial depth — and replaces the round output housing of EP-ZDWE with the square output flange (□60–□175 mm) of EP-ZDF, enabling direct flat-plate bolt-down mounting without a precision bore. All internal gear stages, torque ratings, backlash specifications, efficiency values, and lifetime lubrication characteristics are identical to EP-ZDWE.

Korean OEM machine builders who design machines around laser-cut flat-plate chassis or welded box-section frames — common in Korean AGV manufacturers, collaborative robot frame builders, and compact conveyor system integrators — find EP-ZDWF the optimal specification when the design brief simultaneously constrains both available axial depth behind the drive axis and the available machine shop operations for boring.

When Both Constraints Apply — EP-ZDWF Is the Correct Specification

⚠ Installation Cautions: Motor input direction is fixed at manufacture — specify correctly when ordering. Square flange face must have full contact with the machine plate — a gap concentrates bolt load and risks flange fatigue. Do not apply axial force to the bevel input shaft during motor installation. Never exceed 4,500 rpm input speed. The sealed housing has no grease port — do not add lubricant externally.

✔ Zero Maintenance — Both Stages Covered: The factory-sealed lifetime lubrication covers both the bevel input stage and the planetary gear stages in a single housing. No separate bevel gear oil, no scheduled lubrication, no re-greasing required over the 20,000-hour rated life. Re-check the 4 flange mounting bolts at the first 5,000-hour inspection alongside the visual lip seal check — this is the only periodic maintenance action for EP-ZDWF.

Low-Profile AGV Drive Modules — Laser-Cut Chassis, Minimal Height

Korean AGV manufacturers building low-profile warehouse AMRs with a chassis height of 100–150 mm use EP-ZDWF-60 and EP-ZDWF-80 for drive wheel servo reductions. The square flange bolts to the bottom chassis plate through 4 laser-cut holes — no boring, no secondary machining — and the motor exits upward into the chassis interior through the available 100–150 mm chassis height. Total gearbox axial depth below the chassis plate is the L1 dimension only (150–184.5 mm for 60–80 frame, 1-stage), which places the drive wheel at the correct height relative to the floor. Korean AGV manufacturers in Hwaseong, Incheon, and Ansan report EP-ZDWF enabling low-profile AMR designs that compete directly with purpose-built AGV gear units at a fraction of the custom tooling cost.

Welded-Frame Compact Special-Purpose Machines

Korean special-purpose machine builders fabricating welded steel box frames for dedicated assembly, testing, or material handling equipment use EP-ZDWF where both the axial space and the bore machining capability are unavailable. A laser-cut insert plate welded into the frame provides the flat mounting surface for EP-ZDWF's square flange. The right-angle bevel input positions the motor within the frame depth rather than projecting beyond the frame boundary. This is particularly common in Korean EV battery module assembly machines, where the machine footprint is tightly constrained by the production cell layout and bore machining of welded assemblies is impractical.

Aluminium Profile Automation Cells — No Secondary Machining

Korean automation system integrators building reconfigurable assembly and dispensing cells from 80×80 or 120×120 mm aluminium profile framing specify EP-ZDWF for servo drive axes on the profile structure. The square flange bolts to an end-plate or gusset attached to the profile — no bore possible in the profile itself — and the motor exits along the profile section axis, keeping the overall drive package within the profile grid without oversized brackets. For the round-flange right-angle variant used with custom-bored profile blocks, see the EP-ZDWE series right angle planetary gearbox.

Collaborative Robot Wrist — Square-Flange Plate-Mount Structure

Korean collaborative robot manufacturers using laser-cut carbon-fibre or aluminium plate assemblies for robot arm structure (rather than cast or machined arm links) use EP-ZDWF for wrist roll and wrist pitch joints. The square flange bolts to the plate assembly without requiring a precision bore that would be impractical in thin-plate composite structures. The right-angle input routes the motor parallel to the arm link, controlling the wrist outer diameter to the gearbox body size (□60–□90 mm). For applications where the arm structure can accommodate a round bore, the EP-ZDWE round-flange version planetary gearbox provides equivalent performance.

Narrow-Profile Packaging Machine Bracket Modules

Korean packaging machinery OEMs designing servo-actuated filling and sealing stations for narrow-pitch carousel or chain-conveyor packaging lines use EP-ZDWF-60 and EP-ZDWF-80 for bracket-mounted servo actuators where both the bracket footprint and the available depth behind the mounting plate are constrained. The square flange enables the entire motor-gearbox module to be replaced as a bolted assembly in a single maintenance operation — without removing the bracket from the machine or performing any bore-alignment procedure. The right-angle bevel input routes the motor along the machine structure rather than projecting it into the operator access zone.

Solar Tracker Slew Drives — Flat-Plate Mounting, Lateral Motor

Korean solar tracker manufacturers designing single and dual-axis trackers with flat steel tube or angle-iron mounting structures for utility-scale solar farms in Korea, Vietnam, and Southeast Asia use EP-ZDWF-120 and EP-ZDWF-160 for the azimuth and elevation axis drives. The square flange bolts directly to a flat mounting plate welded onto the tracker torque tube assembly — no machined bore on the field-fabricated steel structure. The right-angle bevel input routes the servo motor laterally along the torque tube rather than projecting it perpendicular to the tracker panel surface, reducing wind load on the drive assembly and keeping the motor within the tracker's structural shadow. IP54 sealing and the −25°C to +90°C operating range cover Korean outdoor tracker operating conditions year-round.

• ✔Right-angle servo gearbox bevel stage and square flange face flatness verified per production batch
• ✔Backlash measured per unit at ±3% of rated output torque — measurement certificate with every order
• ✔Full-load torque test 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-ZDWF-60 at 10:1 single-stage for a 130 mm chassis-height low-profile AMR. Our chassis is laser-cut 4 mm aluminium plate — the bolt holes for EP-ZDWF are included in the cutting file at zero additional cost. Previous design used a competitor right-angle gearbox with a round output bore that required a precision-bored adapter plate; adding that adapter plate added 18 mm to the chassis height, pushing us over our 130 mm target. EP-ZDWF bolts directly to the chassis plate without the adapter, keeping us at 129 mm. We're producing 300+ AMR units per year; at this volume, eliminating the adapter plate saves 12 minutes of assembly time and approximately 850 KRW per unit in hardware cost. Korea Ever-Power confirmed our chassis plate hole pattern was compatible in 3 hours.

EP-ZDWF-80 at 20:1 two-stage for a battery module stacking robot on a welded steel base frame. Frame is fabricated from 100×100 mm welded box section — no machining facility on-site. We needed a servo gear reducer for the stacking head Z-axis drive where both the column depth (220 mm available) and the bore machining capability were unavailable. EP-ZDWF-80 with motor-right input direction fit exactly within 202.5 mm (2-stage L1), motor exiting into the available lateral space within the column. We welded a 10 mm laser-cut insert plate into the frame, drilled 4 holes, bolted the gearbox — total installation time 45 minutes per axis including motor coupling. 14 machines deployed, now running 18 months with zero gearbox issues.

EP-ZDWF-60 at 16:1 two-stage for the wrist pitch joint of a carbon-fibre plate robot arm. Our arm structure is CNC-milled 3 mm CFRP plate — precision boring is impractical in thin CFRP. EP-ZDWF square flange bolts to a titanium insert bonded into the plate assembly, the motor exits along the forearm axis via the right-angle input. The Korea Ever-Power application team provided the input direction (motor-up) and the exact input flange for our Delta servo motor within 6 hours of sending the motor drawing. Wrist pitch joint outer dimension: 74 mm — previously impossible with inline drive at this torque level. Now 11 months in operation on a food-grade coating robot; lifetime sealed grease is essential for our cleanroom compliance.

EP-ZDWE — Right-Angle, Round Flange

Same right-angle bevel input and torque/backlash specifications as EP-ZDWF, with a round (circular) output flange for bore-mount installation. Choose EP-ZDWE when axial space saving is the priority but a precision bore is available — round flange provides better radial load support in some designs.

EP-ZDF — Inline Input, Square Flange

Same square flange output and torque/backlash specifications as EP-ZDWF, with an inline coaxial motor input. Choose EP-ZDF when no-bore plate mounting is required but axial space is not constrained — and get 96% single-stage efficiency (vs 94% for EP-ZDWF) plus <8 arcmin backlash (vs <25–30 arcmin for EP-ZDWF).

EP-ZDS — High Stiffness, Heavy Load

When EP-ZDWF-160 at 800 N·m is insufficient — EP-ZDS delivers up to 1,800 N·m (190-frame) with inline input, square flange, IP65 protection, torsional stiffness up to 130 N·m/arcmin, and 28,000 N maximum axial force. Note: EP-ZDS is inline input only; for heavy loads with right-angle input requirements, contact Korea Ever-Power for a custom solution.

QWhat is the difference between EP-ZDWF and EP-ZDWE, and when should I choose EP-ZDWF?

EP-ZDWF and EP-ZDWE are identical in all performance specifications — same right-angle bevel input, same torque ratings, same backlash, same efficiency, same input flange. The only difference is the output housing: EP-ZDWF has a square output flange (□60–□175 mm) for direct flat-plate bolt-down mounting, while EP-ZDWE has a round cylindrical body for bore-mount installation. Choose EP-ZDWF when your machine structure is a flat plate, welded frame, aluminium extrusion profile, or any surface where a precision bore is unavailable or impractical. If a precision bore is available and you prefer bore-mount, EP-ZDWE is the equivalent product.

QCan I specify EP-ZDWF when I only need one of the two advantages — axial saving or no-bore?

Yes — EP-ZDWF is technically correct for applications where only one advantage applies. However, if only axial space saving is needed and a bore is available, EP-ZDWE (round flange) may offer better radial load support from the bore fit. If only no-bore mounting is needed and axial space is adequate, EP-ZDF (inline, square flange) provides better efficiency (96% vs 94%) and lower backlash (<8 arcmin vs <25–30 arcmin). Korea Ever-Power's application team provides a recommendation based on your specific installation constraints.

QThe 160ZDWF has L11 = 5 mm flange thickness — is this sufficient for high-torque applications?

Yes — the 5 mm flange thickness of the 160ZDWF is designed for the 160-frame load conditions and has been validated in Korea Ever-Power's full-load torque testing at the rated 800 N·m output. The thinner flange (compared to 15 mm for 120ZDWF) is a design choice based on the 160-frame housing geometry, not a capacity reduction. The output reaction torque is transmitted through the 4 through-bolt clamping force — the bolt pattern and bolt class (8.8 or 10.9 recommended) determine the joint capacity, not the flange thickness alone. If you are designing a new machine using 160ZDWF, Korea Ever-Power can provide the bolt joint calculation for your specific bolt class and plate material on request.

QCan I include the EP-ZDWF bolt-hole pattern in a laser-cut plate cutting file to eliminate secondary drilling?

Yes — this is one of the most common installation methods for Korean AGV and flat-plate machine builders using EP-ZDWF. The 4 through-bolt holes (diameter D9) at the bolt-hole PCD (D8) are standard laser-cuttable features. Korea Ever-Power provides the DXF or STEP file of the EP-ZDWF output flange face on request, which can be imported directly into your plate cutting file. The holes are cut simultaneously with the plate profile at zero additional cutting time. Confirm the D9 hole size from the dimension table for your frame size — e.g. for 80ZDWF, D8 = Φ100 mm PCD, D9 = Φ6.5 mm through-bolt holes.

QDoes EP-ZDWF require any maintenance beyond checking the 4 flange bolts?

No — EP-ZDWF uses factory-sealed lifetime lubrication covering both the bevel input and planetary gear stages. No re-greasing, no oil changes, no lubrication interval scheduling is required over the 20,000-hour rated service life. The recommended periodic checks are: (1) visual inspection of the output shaft lip seal every 5,000 hours to confirm no contamination ingress, and (2) re-torque check of the 4 square flange mounting bolts at the first 5,000-hour inspection to confirm no thermal settling since installation. At the end of the 20,000-hour rated life, replace the gearbox unit — field component replacement is not recommended.