{"id":600,"date":"2026-05-29T06:51:55","date_gmt":"2026-05-29T06:51:55","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?post_type=product&p=600"},"modified":"2026-05-29T06:53:02","modified_gmt":"2026-05-29T06:53:02","slug":"ep-ap-apk-curvic-plate-planetary-gearbox","status":"publish","type":"product","link":"https:\/\/planetary-gearboxes.com\/ru\/product\/ep-ap-apk-curvic-plate-planetary-gearbox\/","title":{"rendered":"EP-AP \/ EP-APK Series Curvic Plate Rack-Drive Planetary Gearbox"},"content":{"rendered":"

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EP-AP \/ EP-APK Series \u2014 Curvic Plate Rack-Drive Planetary Gearbox up to 14,010 N\u00b7m<\/h2>\n
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\"EP-AP<\/p>\n

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14,010
\nN\u00b7m<\/div>\n
Max output torque<\/div>\n<\/div>\n
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Curvic
\nPlate \u2605<\/div>\n
1-screw self-centring<\/div>\n<\/div>\n
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\u22641\u20132′<\/div>\n
Backlash (arcmin)<\/div>\n<\/div>\n
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Rack
\nOptimised<\/div>\n
Linear drive system<\/div>\n<\/div>\n<\/div>\n

\n\u2190 Browse All Planetary Gearbox Series
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\u2605 14,010 N\u00b7m + Curvic Plate \u2014 Highest Torque in the Korea Ever-Power Range, Built for Rack Drives<\/div>\n

EP-AP delivers 14,010 N\u00b7m \u2014 exceeding even the New Line AH\/AHK planetary gearbox<\/a> maximum of 9,585 N\u00b7m. The output pinion connects to the gearbox via a patented Curvic Plate: a single screw clamps a curved-tooth face-gear interface that self-centres the pinion automatically, enabling rapid pinion replacement in rack-and-pinion linear systems without removing the gearbox from the machine.<\/p>\n<\/div>\n

The EP-AP series Curvic Plate rack-drive planetary gearbox<\/strong> is the Korea Ever-Power product engineered specifically for large-format rack-and-pinion linear drive systems \u2014 gantry machine tools, large laser cutters, panel handling systems, and heavy portal cranes where the gearbox drives a rack-mounted pinion that traverses a linear axis. The Curvic Plate’s self-centring single-screw design solves the most operationally demanding maintenance requirement of rack-and-pinion systems: rapid, repeatable pinion replacement when the pinion tooth flank wears, without removing the gearbox or disturbing the servo motor cable connections.<\/p>\n

Four variants cover the installation geometry range: AP<\/strong> inline and APC<\/strong> compact inline for coaxial motor-to-pinion layouts, and APK<\/strong> right-angle and APCK<\/strong> compact right-angle for machines where the servo motor must be positioned perpendicular to the rack axis. All variants share the same Curvic Plate output interface, the same 090\u2013450 mm frame size range, the same \u22641 to 2 arcmin backlash specification, and the same 315\u201314,010 N\u00b7m output torque range.<\/p>\n

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\ud83d\udd27 1-Screw Pinion<\/div>\n
Curvic Plate replaces pinion in minutes \u2014 no gearbox removal.<\/div>\n<\/div>\n
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\ud83d\udcd0 \u22641\u20132 Arcmin<\/div>\n
Precision grade at 14,010 N\u00b7m \u2014 no compromise between torque and accuracy.<\/div>\n<\/div>\n
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\ud83d\udccf Up to 450 mm<\/div>\n
8 frame sizes, 090\u2013450 mm body. Same maximum as AH\/AHK.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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The Curvic Plate \u2014 Why One Screw Changes Rack-Drive Maintenance<\/h2>\n
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CONVENTIONAL PINION CONNECTION<\/p>\n

[Gearbox] \u2500\u2500\u2500\u2500 [Spline\/Key]
\n\u2502
\n[Pinion Gear]
\n\u2502
\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 RackReplacement requires:
\n\u2022 Servo cable disconnect
\n\u2022 Gearbox removal from carriage
\n\u2022 Spline extraction tool
\n\u2022 Realignment after installation
\n\u2192 2\u20134 hours downtime<\/div>\n

CURVIC PLATE \u2014 EP-AP\/APK<\/p>\n

[Gearbox] \u2500\u2500\u2500\u2500 [Curvic Plate \u2699]
\n\u2195 1 screw only
\n[Pinion Gear]
\n\u2502
\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 RackReplacement:
\n\u2022 Loosen 1 screw
\n\u2022 Slide off old pinion
\n\u2022 Slide on new pinion
\n\u2022 Tighten 1 screw \u2192 self-centres
\n\u2192 15\u201330 minutes downtime<\/div>\n<\/div>\n<\/div>\n

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Three Engineering Advantages the Curvic Plate Delivers<\/h3>\n
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\u2460 Rapid Pinion Replacement \u2014 From Hours to Minutes<\/strong><\/p>\n

In a rack-and-pinion linear drive, the pinion tooth flanks wear over millions of cycles \u2014 particularly at high feed rates in Korean gantry machine tools, large-format laser cutting systems, and heavy steel plate handling gantries. Conventional gearboxes require disconnecting the servo motor, removing the gearbox from the machine carriage, extracting the pinion from a spline or key connection with specialised tools, and realigning the entire assembly after reinstallation. The Curvic Plate reduces this to: loosen one screw, slide off the worn pinion, slide on the new pinion, tighten one screw. The curved-tooth face-gear geometry self-centres the new pinion automatically \u2014 no alignment tool, no runout check, no downtime beyond the screw operation itself.<\/p>\n<\/div>\n

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\u2461 Repeatable Self-Centring \u2014 Same Accuracy After Every Replacement<\/strong><\/p>\n

The Curvic Plate’s curved-tooth face-gear geometry produces a centering force when the screw is tightened \u2014 the pinion self-locates to the same centreline position every time, regardless of the installation sequence or operator technique. This means the rack-to-pinion mesh geometry, centre distance, and pitch line contact remain constant after every replacement. In Korean machine tool applications where the X-axis linear position repeatability is the machine’s primary accuracy metric, Curvic Plate’s repeatable self-centring directly maintains axis accuracy through the maintenance cycle without a machine re-calibration after each pinion change.<\/p>\n<\/div>\n

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\u2462 No Gearbox Removal \u2014 Servo Motor Stays Connected<\/strong><\/p>\n

Because the Curvic Plate replaces the pinion from the output side \u2014 not the motor side \u2014 the servo motor, encoder cable, power cable, and brake cable remain connected throughout the pinion replacement procedure. On Korean machine tools where the servo cable bundle runs through a cable chain and the motor mounting requires careful torque sequencing on reassembly, eliminating the motor disconnection step removes the risk of cable damage during maintenance and eliminates the subsequent motor re-calibration step that would otherwise be required.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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AP Curvic Plate vs Standard Planetary for Rack-and-Pinion Systems<\/h3>\n
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Criterion<\/th>\nEP-AP Curvic Plate \u2605<\/th>\nStandard Planetary (AB\/AF\/AH)<\/th>\n<\/tr>\n<\/thead>\n
Pinion replacement method<\/td>\n1 screw \u2014 15\u201330 minutes, no gearbox removal<\/td>\nSpline\/key extraction \u2014 2\u20134 hours, gearbox removal<\/td>\n<\/tr>\n
Pinion self-centring<\/td>\nAutomatic \u2014 Curvic face-gear geometry<\/td>\nManual alignment required after each reinstallation<\/td>\n<\/tr>\n
Servo motor disconnect<\/td>\nNot required \u2014 pinion replaced from output side<\/td>\nRequired \u2014 gearbox removal means motor disconnect<\/td>\n<\/tr>\n
Axis accuracy after replacement<\/td>\nMaintained \u2014 self-centring restores original position<\/td>\nRequires re-calibration and accuracy verification<\/td>\n<\/tr>\n
Max output torque<\/td>\n14,010 N\u00b7m \u2014 highest in Korea Ever-Power range<\/td>\n3,805 N\u00b7m (precision) \/ 9,585 N\u00b7m (New Line)<\/td>\n<\/tr>\n
Backlash \/ Efficiency \/ IP<\/td>\nComparable \u2014 \u22641\u20132 arcmin \u00b7 \u226597% single-stage \u00b7 IP65 \u00b7 \u221210 to +90 \u00b0C<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n

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Four Variants \u2014 AP, APC, APK, APCK<\/h2>\n
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EP-AP \u2014 Inline Standard<\/h3>\n
Motor \u2500\u2500[Gearbox]\u2500\u2500\u25b6 Curvic Plate \u2500\u2500\u25b6 Pinion \u2192 Rack<\/div>\n

Standard inline configuration \u2014 motor and Curvic Plate output share a common axis. Used in Korean gantry machine tools and large laser cutting systems where the servo motor is coaxial with the rack drive axis. Backlash \u22641 to 2 arcmin (1\u20133 stage configurations).<\/p>\n<\/div>\n

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EP-APC \u2014 Compact Inline<\/h3>\n
Motor \u2500\u2500[Compact Gearbox]\u2500\u2500\u25b6 Curvic \u2500\u2500\u25b6 Pinion \u2192 Rack<\/div>\n

Compact housing version of AP \u2014 same inline geometry and Curvic Plate interface, reduced gearbox body length. Used when the carriage assembly depth is constrained and the motor-to-rack dimension must be minimised. Same backlash and torque specification as AP.<\/p>\n<\/div>\n

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EP-APK \u2014 Right-Angle<\/h3>\n
Motor \u2500\u2500[Gearbox]\u2500\u2500\u2510
\n90\u00b0 \u25bc Curvic \u2500\u2500\u25b6 Pinion \u2192 Rack<\/div>\n

Right-angle output \u2014 servo motor perpendicular to the rack axis. Used in Korean heavy portal cranes, panel handling systems, and large gantry structures where the servo motor cannot be positioned coaxially with the rack due to structural clearance. Backlash \u22642 arcmin (2\u20134 stage configurations).<\/p>\n<\/div>\n

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EP-APCK \u2014 Compact Right-Angle<\/h3>\n
Motor \u2500\u2500[Compact]\u2500\u2500\u2510
\n90\u00b0 \u25bc Curvic \u2500\u2500\u25b6 Pinion \u2192 Rack<\/div>\n

Compact housing right-angle variant \u2014 combines the perpendicular motor layout of APK with a reduced gearbox body for space-constrained carriage designs. Same Curvic Plate interface and \u22642 arcmin backlash as APK.<\/p>\n<\/div>\n<\/div>\n

\u25b8 All four variants share: <\/span>
\nThe Curvic Plate single-screw self-centring pinion interface \u00b7 315\u201314,010 N\u00b7m output torque range \u00b7 090\u2013450 mm frame sizes \u00b7 \u221210 \u00b0C to +90 \u00b0C \u00b7 IP65 \u00b7 4:1 to 5,500:1 reduction ratio range across 1\u20134 stage configurations.<\/span><\/div>\n<\/section>\n

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EP-AP \/ APK Series \u2014 Complete Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Common Specifications \u2014 All AP\/APC\/APK\/APCK Variants<\/th>\n<\/tr>\n<\/thead>\n
Output Torque<\/td>\n315 N\u00b7m (AP090) to 14,010 N\u00b7m (AP450) \u2014 highest in Korea Ever-Power range<\/td>\n<\/tr>\n
Output Interface<\/td>\nCurvic Plate \u2014 single-screw self-centring pinion connection (patented)<\/td>\n<\/tr>\n
Backlash \u2014 AP\/APC (inline)<\/td>\n\u22641 to 2 arcmin (1\u20133 stage configurations)<\/td>\n<\/tr>\n
Backlash \u2014 APK\/APCK (right-angle)<\/td>\n\u22642 arcmin (2\u20134 stage configurations)<\/td>\n<\/tr>\n
Backlash grade codes<\/td>\nNone \u2014 fixed specification per stage count. No P0\/P1\/P2 designation.<\/td>\n<\/tr>\n
Stage Configurations<\/td>\n1-stage, 2-stage, 3-stage, 4-stage<\/td>\n<\/tr>\n
Reduction Ratio Range<\/td>\n4:1 (single-stage) to 5,500:1 (four-stage)<\/td>\n<\/tr>\n
Single-Stage Efficiency<\/td>\n\u226597%<\/td>\n<\/tr>\n
Two-Stage Efficiency<\/td>\n\u226594%<\/td>\n<\/tr>\n
Three-Stage Efficiency<\/td>\n\u226592%<\/td>\n<\/tr>\n
Four-Stage Efficiency<\/td>\n\u226590%<\/td>\n<\/tr>\n
\u0420\u0430\u0431\u043e\u0447\u0430\u044f \u0442\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440\u0430<\/td>\n\u221210 \u00b0C to +90 \u00b0C<\/td>\n<\/tr>\n
IP Rating<\/td>\nIP65 standard<\/td>\n<\/tr>\n
Frame Sizes (body \u00d8)<\/td>\n090 \/ 110 \/ 140 \/ 200 \/ 255 \/ 285 \/ 355 \/ 450 mm<\/td>\n<\/tr>\n
Minimum Frame<\/td>\n090 mm \u2014 AP\/APK are large-frame series only. No small frames below 090 mm.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
\u25b8 Minimum 090 mm frame \u2014 AP is a large-frame series: <\/span>
\nEP-AP\/APK starts at 090 mm body diameter, with a minimum output torque of 315 N\u00b7m. This series is not appropriate for small-format or low-torque rack systems. For rack-and-pinion applications with output torque below 315 N\u00b7m or requiring frames smaller than 090 mm, a standard precision series gearbox with a conventional pinion connection is the correct specification. Contact Korea Ever-Power with your rack force and feed rate requirements to confirm the correct AP frame size.<\/span><\/div>\n<\/section>\n

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Applications \u2014 Rack-and-Pinion Linear Drives in Korean Industry<\/h2>\n
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Gantry Machine Tools \u2014 AP on Both X-Axis Sides<\/h3>\n

Korean large-format gantry machining centres \u2014 5-axis gantry mills for aerospace structural parts, large mould machining centres, bridge-type machining centres \u2014 use EP-AP on the X-axis rack drive on both sides of the gantry bridge. Gantry synchronisation requires the same pinion-to-rack mesh geometry on both sides after every maintenance event. Curvic Plate’s self-centring guarantees that both sides restore to the same mesh position after pinion replacement, maintaining gantry synchronisation accuracy without a re-calibration run across the full X-axis travel. AP200\u2013AP285 cover the torque range of Korean aerospace and mould-making gantry machine tool X-axis drives. For offset motor mounting configurations, pairs with precision CV drive shafts for dual-drive carriage synchronisation.<\/p>\n<\/div>\n

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Large-Format Laser Cutting Systems \u2014 APC Compact<\/h3>\n

Korean large-format fibre laser cutting systems for steel plate and structural section cutting \u2014 4 m \u00d7 20 m working area, cutting heads travelling at 60\u2013150 m\/min \u2014 require rack-drive gearboxes on the long-axis carriage that minimise the carriage profile depth while delivering the torque needed for high-speed acceleration. EP-APC compact inline Curvic Plate reduces carriage depth compared to standard AP while maintaining the single-screw pinion replacement capability. At Korean laser cutting production rates (multiple shifts, high feed rates), pinion wear intervals are measured in months rather than years; the Curvic Plate replaces a multi-hour downtime maintenance event with a 30-minute procedure that does not interrupt the production shift.<\/p>\n<\/div>\n

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Heavy Portal Cranes \u2014 APK Right-Angle for High Rack Force<\/h3>\n

Korean shipyard and heavy industry portal cranes traversing on rack-and-pinion rail systems \u2014 handling loads up to 500 tonnes over 100 m travel distances \u2014 require rack drive gearboxes at the upper range of EP-AP: APK200 to APK450, right-angle configuration with the drive motor positioned across the crane bridge perpendicular to the travel direction. At 14,010 N\u00b7m maximum output, APK450 addresses the highest crane rack drive torque in the Korea Ever-Power range. The \u221210 \u00b0C lower temperature limit covers outdoor Korean winter crane operation.<\/p>\n<\/div>\n

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Automated Panel Handling \u2014 APCK Compact Right-Angle<\/h3>\n

Korean flat-panel display and semiconductor substrate automated material handling systems \u2014 large panel transport carriages, glass substrate handling gantries \u2014 use EP-APCK compact right-angle on the linear drive axes. The compact housing reduces carriage height for under-gantry clearance requirements, the right-angle layout places the motor within the carriage structure perpendicular to the travel axis, and the Curvic Plate provides the rapid pinion replacement capability needed in cleanroom-adjacent maintenance environments where extended on-machine work is restricted.<\/p>\n<\/div>\n

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Plasma and Waterjet Cutting Gantries \u2014 AP for Heavy Plate<\/h3>\n

Korean heavy plate cutting operations \u2014 plasma cutting of 100 mm structural steel, waterjet cutting of composite structures \u2014 use rack-driven gantry systems with EP-AP for the long-axis drive. Heavy plate cutting imposes high cutting reaction forces on the rack drive; AP’s torque capacity up to 14,010 N\u00b7m absorbs these forces while the Curvic Plate’s single-screw pinion allows maintenance on the shop floor without specialist tooling. AP140 and AP200 cover the torque range of Korean standard plasma and waterjet heavy-plate gantry drives.<\/p>\n<\/div>\n

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Renewable Energy Manufacturing \u2014 Long-Axis Gantry Drives<\/h3>\n

Korean wind turbine blade manufacturing gantries and large solar panel frame fabrication systems use rack-driven long axes up to 50 m travel. EP-AP on these systems benefits from the Curvic Plate maintenance capability, since gantry systems in production environments run at multi-shift utilisation rates that accelerate pinion wear cycles. Downstream integration with agricultural bevel gearboxes is not typical for this application class, but gravity-hold braking via worm gear reducers is used on vertical gantry axes where rack-driven Z-columns must hold position on power-off.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Quality Certifications & Testing Standards<\/h2>\n
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ISO 9001<\/div>\n
Quality Management<\/div>\n<\/div>\n
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CE<\/div>\n
EU Machinery Directive<\/div>\n<\/div>\n
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KS<\/div>\n
Korean Industrial Standard<\/div>\n<\/div>\n
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RoHS<\/div>\n
Hazardous Substance Free<\/div>\n<\/div>\n<\/div>\n