EP-TNR Right-Angle Round-Flange Helical Planetary Gearbox

When a machine design requires the servo motor to exit perpendicular to the load axis και the load must bolt directly to a large-diameter flange face — rather than clamp to a shaft — the EP-TNR is the correct configuration. A robot arm link that bolts to the gearbox output face, a CNC rotary table with a round-bore housing that the gearbox pilot register seats into, a direct-drive indexing head mounting flange: these applications need a bolt circle, not a shaft end, and they need the motor out of the axial envelope. The EP-TNR delivers both requirements in a single sealed unit across six frame sizes from 060 to 220 mm.

Three gearbox configurations are available in this product family. Each solves a different spatial constraint. Understanding why a machine designer reaches for EP-TNR rather than EP-TNF or EP-TMR requires understanding the exact geometric conflict each configuration resolves.

⚠ Input direction is permanent: The motor input direction (left / right / up / down) is set at manufacture. Do not attempt to rotate the bevel housing to change the input direction after delivery — the bevel gear mesh geometry is calibrated for one specific orientation. Any attempt to change input direction in the field voids the warranty.

✔ Single sealed housing — no separate bevel maintenance: The spiral bevel stage and helical planetary stage share one factory-sealed grease housing. There is no separate oil reservoir for the bevel gears, no oil level window, and no scheduled lubrication for the bevel stage. The sealed grease fill covers both stages for the full 20,000-hour rated life.

The EP-TNR integrates six precision subsystems in a single sealed unit. The first three are shared with the EP-TNF inline family. Components four through six are specific to the right-angle configuration and govern the bevel stage performance that distinguishes the EP-TNR from both the EP-TNF and the keyed-shaft EP-TMR.

① Korean 5-Axis CNC B-Axis — Depth-Constrained Column

Korean compact 5-axis machining centre builders facing a hard column depth limit behind the B-axis rotary table reach for TNR090/115 at i=25–50. The motor exits laterally within the column width; the large-diameter output flange (Ø116 or Ø152 mm) seats directly in the table housing bore. The result is a B-axis assembly 60–90 mm shorter than the equivalent EP-TNF + motor inline, allowing a narrower column cross-section and measurable machine weight reduction across a production batch.

② Korean Cobot Wrist Roll Joint — ISO 9409 Direct Mount

Korean collaborative robot developers designing 6-axis cobots for the general-industry market specify TNR060 at i=16–20 for the J4 wrist roll axis. The Ø80 mm output flange matches the ISO 9409-1 size 50 robot flange interface, allowing standard end-effector tool flanges to bolt directly to the gearbox output face. The motor exits perpendicular to the forearm axis, keeping the forearm outer diameter at 72–78 mm — achievable with EP-TNR, not possible with an inline EP-TNF at the same torque level.

③ Korean Precision Indexing Head — Direct Coupling Without Adapter Ring

Korean machine tool accessory manufacturers building direct-drive indexing heads specify TNR090/115 at i=20–40. The output flange pilot register centres the indexing head spindle directly — no intermediate adapter ring, no accumulated alignment error from ring machining tolerances. For multi-station assembly machines running 24/7, the elimination of an intermediate coupling component also eliminates one failure-mode item from the maintenance schedule. Achievable positional accuracy at the indexing table face depends on the EP-TNR output flange runout (≤0.02 mm) plus the indexing head spindle bearing preload — typically ≤0.05 mm total at the table rim.

④ Korean Pharmaceutical Conveyor Side Drive — Hygiene Zone

Korean pharmaceutical blister pack and liquid fill conveyor systems require drives that mount flush to the conveyor side frame — the product zone above must be clear of all mechanical projections. TNR060/090 with motor-down or motor-up configuration mounts flush, the round flange seats in the conveyor frame side plate bore, and the motor drops below or rises above the conveyor top surface. IP65 sealing handles CIP wash-down cleaning. The sealed grease fill produces no particle generation — an explicit cleanroom conveyor requirement that rules out open oil-bath reducers.

⑤ Korean Semiconductor EFEM — Robot Theta Axis

Equipment Front End Modules in Korean fab tool sets use TNR060 for the wafer transport robot theta (rotational) axis. The compact housing — 153 mm axial depth with the motor exiting sideways — fits within the EFEM equipment footprint constraint that governs the fab aisle tool pitch. The round output flange centres the robot turret directly with sub-0.02 mm runout, contributing to the wafer slot alignment repeatability required by SEMI E84 AMHS load-port standards.

⑥ Agricultural Equipment — Precision Seeding Carriage Rotation

Modern GPS-guided precision seeders use servo-controlled row unit carriages that rotate to follow field contours and headland turns. TNR090 at i=25–50 positions the motor along the carriage frame while delivering output flange torque directly to the carriage pivot bearing. Downstream agricultural multi-output gearboxes then distribute power to the individual row unit drives from the single TNR output, keeping the servo motor count minimal and the control system simple. IP65 sealing and −10°C to +90°C temperature range cover all seasonal field operating conditions.

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TNR115 i=40 dual-stage for the B-axis of our new compact 5-axis VMC. Previous machine generation used an EP-TNF115 with the Yaskawa motor inline — total assembly was 337 mm, pushing us to a wider column than we wanted. With EP-TNR115 the axial depth is 266 mm and the motor exits to the left within the column. Column cross-section reduced by 65 mm, saving 9 kg per machine. Korea Ever-Power sent the full dimensional drawing and confirmed the input flange for our Yaskawa SGMGV-09A motor within 4 hours of my enquiry.

EP-TNR060 i=16 two-stage for the J4 wrist roll joint. Target forearm outer diameter was 76 mm — with a standard inline gearbox at this torque the forearm would have been at least 95 mm diameter. EP-TNR060 (Ø80 mm flange body) let us achieve 74 mm forearm OD. The ISO 9409-1 flange match meant our standard tool quick-change adapters fit without any modification. The ≤10 arcmin P2 backlash is fully within tolerance for our closed-loop wrist position control. 22 units deployed across two cobot models — no field issues in 11 months.

EP-TNR090 i=20 single-stage, motor-down configuration, for blister pack conveyor head drives in our KFDA-compliant production facility. Previous worm reducer at this position required quarterly oil changes — a 40-minute procedure per conveyor head that accumulated to significant maintenance hours across a 24-line facility. EP-TNR sealed grease eliminated the oil change schedule entirely. IP65 handles our daily CIP foam wash. After 14 months operation and three scheduled audits, all 28 units remain within the delivery certificate backlash value.

EP-TNF — Round Flange, Inline

Same round flange output face as EP-TNR. Motor coaxial behind the output. Lower backlash (P1 ≤5 arcmin) because no bevel stage. Choose EP-TNF when axial depth allows the motor inline and minimum backlash is the priority.

EP-TMR — Right-Angle, Keyed Shaft

90° right-angle, same motor direction flexibility as EP-TNR, but outputs through a round/keyed shaft rather than a bolt-circle flange. Choose EP-TMR for rack-and-pinion, coupling-connected ball screw, or conveyor pulley shaft applications.

EP-TM — Inline, Keyed Shaft

Highest efficiency (≥97% L1), lowest backlash (P0 ≤1 arcmin), no bevel stage. The baseline helical planetary for all applications where axial depth is not constrained and inline motor placement is possible.

EP-TEG — Ultra-Precision P0

P0 ≤1 arcmin inline flange output. For semiconductor equipment, precision optics, and CNC ultra-precision rotary tables where EP-TNR backlash exceeds the system error budget.

QMy machine currently uses an EP-TNF. Can I swap to an EP-TNR to save axial depth without changing the output-side machine drawings?

Yes — the EP-TNR output flange diameter, bolt circle diameter, thread specification, pilot register diameter, and shaft tolerance are identical to the EP-TNF at the same frame size. You keep all output-side machine drawings unchanged. The only changes required are the motor adapter side (the perpendicular input flange dimensions differ) and the motor cable routing (motor now exits sideways rather than rearward). Confirm the available space in the motor-exit direction before specifying the input direction (left / right / up / down). Korea Ever-Power provides a dimensional drawing confirming the fit before order at no charge.

QFor a robot wrist joint requiring ISO 9409-1 compatibility, does the EP-TNR output flange match the standard directly?

The EP-TNR output flange dimensions are compatible with ISO 9409-1 robot wrist interface dimensions for several frame sizes, but the bolt circle diameter and pilot register must be confirmed against your specific ISO 9409-1 size designation before ordering. The TNR060 Ø80 mm flange is geometrically compatible with ISO 9409-1 size 50; TNR090 Ø116 mm with size 80. Korea Ever-Power confirms the specific bolt circle, pilot register, and thread specification against your ISO 9409-1 size requirement — and manufactures custom output flanges for non-standard interfaces with 3–4 week lead time for Korean cobot OEM programmes.

QIs EP-TNR backlash ≤10 arcmin adequate for a closed-loop servo axis with a motor-shaft encoder?

For the majority of Korean industrial servo axes — conveyor, packaging, material handling, robot joint drives — where the position encoder is on the motor shaft and the servo loop closes at the motor, the answer is yes. The servo drive compensates for gearbox backlash by actively tracking the encoder position; the 10 arcmin of dead zone in the gearbox appears as a small velocity lag at direction reversal, not as a positional error in steady-state operation. For axes where positional accuracy at the output flange matters independently of encoder compensation — open-loop stepper drives, direct metrology applications, or wafer positioning — the EP-TNF (≤5 arcmin) or EP-TEG (≤1 arcmin) is the more appropriate specification. Korea Ever-Power provides application-specific backlash impact analysis at no charge for any EP-TNR enquiry.

QWhat is the delivery lead time for EP-TNR units, and are they held in stock?

Standard EP-TNR configurations — frames 060 through 142, ratios i=5/10/20/25, P2 grade, motor-left and motor-right directions — are held in stock with same-week delivery. TNR180/220 large frames, P1 precision grade on all frames, non-standard ratios, and motor-up / motor-down input directions carry a 2–4 week production lead time from the input direction specification. Confirm your required input direction, frame, and ratio with Korea Ever-Power before committing to a machine design timeline — stock status changes with production schedules and is confirmed at the time of enquiry.