EP-AFHK Series Right-Angle Multi-Stage Heavy-Duty Planetary Gearbox

The EP-AFHK series right-angle multi-stage heavy-duty planetary gearbox extends the Korea Ever-Power right-angle precision range beyond the two-stage maximum of the EP-AFR series into configurations that deliver both high output torque up to 3,800 N·m और extreme reduction ratios up to 10,000:1 at a 90-degree output direction. Where EP-AFR covers two-stage inline-plus-bevel combinations up to i=200, EP-AFHK is the product specified when the torque, ratio, or both exceed what a single bevel-stage right-angle unit can achieve.

The series comprises four configurations: AFHK two-stage for moderate ratios up to 100:1, AFHKA three-stage for high-torque outputs above 1,650 N·m up to 1,000:1, AFHKB three-stage for the widest torque range (55–3,345 N·m) at the same 1,000:1 maximum, and AFHK four-stage for extreme ratios to 10,000:1 in the 1,975–3,800 N·m torque class. All configurations share the seven frame sizes AFHK060 through AFHK240, a standard backlash of ≤2 arcmin, and the high-rigidity enlarged output shaft for direct-mounted radial loads.

Best for: Heavy right-angle drives where ratio ≤100:1 is sufficient — heavy rotary tables, large conveyor head drives, and industrial positioners requiring high torque at moderate reduction ratios from a perpendicular motor arrangement.

Best for: Very high-torque right-angle applications at high reduction ratios — heavy crane slewing drives, large industrial turntable drives, and port equipment where both maximum torque and high ratio are simultaneously specified and the motor must be perpendicular to the output axis.

Best for: Wide torque range three-stage applications where the lower torque end (55 N·m) is relevant — machine families spanning from light to heavy configurations using the same gearbox series. AFHKB starts at a much lower minimum torque than AFHKA, making it suitable for medium-torque machines that also need ratios above 100:1.

Best for: Extreme-ratio right-angle drives — solar tracker orientation drives, large antenna positioning systems, crane slewing mechanisms requiring very slow rotation at high torque from a standard servo or induction motor, and any application where 10,000:1 reduction in a single right-angle sealed unit replaces a gearbox-plus-chain-reducer compound system.

Solar and CPV Tracker Azimuth Drives — AFHK 4-Stage at 10,000:1

Utility-scale solar tracking systems — concentrated photovoltaic (CPV) and dual-axis heliostat arrays — require azimuth drives that rotate very slowly (sub-0.1 rpm) with high torque to overcome wind loading, from a motor positioned perpendicular to the tracker azimuth axis. EP-AFHK 4-stage at 10,000:1 achieves this from a standard servo motor without additional gearbox stages or chain reduction, in a single sealed right-angle unit. The ≤2 arcmin right-angle output backlash maintains optical concentration accuracy. Korean and Southeast Asian solar energy installations use EP-AFHK140 and AFHK180 four-stage for arrays above 1 MWp. Pairs with precision CV drive shafts for tracker arrays where the AFHK output drives multiple rows through a common shaft.

Heavy Industrial Crane Slewing — AFHKA 3-Stage

Korean shipyard and heavy industry overhead cranes require slewing mechanism drives that carry the full crane rotation torque at 90 degrees from the drive motor — the motor positioned vertically inside the crane carriage structure, the slewing output driving horizontally through the slewing ring. AFHKA three-stage at 1,650–3,800 N·m covers the torque demands of crane slewing at reduction ratios up to 1,000:1, delivering slow precise rotation speed from a standard servo input while the high-rigidity enlarged shaft handles the slewing ring contact forces.

Steel Plant Heavy Conveyor Head — AFHK 2-Stage

Korean steel service centre blast furnace burden conveyor head drives require right-angle drives at very high torques — the head sprocket must be driven at 90 degrees from the motor which is positioned across the conveyor width. AFHK two-stage at 24–3,340 N·m handles conveyor head torques up to 100:1 reduction with the enlarged shaft carrying the conveyor chain sprocket radial force directly. EP-AFHK180 and AFHK210 two-stage cover the torque range of Korean blast furnace and continuous casting conveyor head drives.

Port Equipment and Marine Slewing — Multi-Stage at High Torque

Korean port container crane slewing, harbour pilot boat davit drives, and offshore handling equipment require right-angle drives in the 1,000–3,800 N·m output range with reduction ratios above what a two-stage unit provides. AFHKB three-stage covers the 55–3,345 N·m range at up to 1,000:1 — bridging the gap between AFHK two-stage (up to 100:1) and AFHK four-stage (which requires 1,975 N·m minimum) for port equipment that specifies moderate-to-high torques with high ratios. Self-locking gravity holding via worm gear reducers for vertical port equipment axes.

Large Agricultural Machinery — AFHKB 3-Stage

Korean large-scale agricultural machinery — combine harvester main drive transmission, sugarcane harvester head drives, and precision tillage equipment — requires right-angle drives where the main power input shaft must turn a corner to reach the working head. AFHKB three-stage covers the wide 55–3,345 N·m range relevant to different machine sizes within a product family, with up to 1,000:1 reduction from a high-speed motor input to a slow-turning working head. Integration with agricultural bevel gearboxes for multi-output power distribution from the AFHKB right-angle output shaft.

Large Precision Rotary Tables — AFHK 2-Stage Heavy

Korean heavy industrial rotary tables for large steel and aluminium fabrication — 2 m diameter tables carrying 5,000 kg workpieces — require right-angle side-entry drives at torques above the EP-AFH inline capacity. AFHK two-stage at up to 3,340 N·m with 90-degree output and ≤2 arcmin backlash drives large tables from a motor positioned beside the table column, with the enlarged shaft carrying the table rim gear mesh force as a radial load. EP-AFHK240 two-stage covers the top torque requirement for Korean heavy industrial table side-entry drives.

• ✔Backlash ≤2 arcmin verified at right-angle output shaft — all stage counts, per batch
• ✔AFHK060 ≤3 arcmin separately verified per batch — distinct specification confirmed
• ✔Full-load torque test at rated output — critical at high-torque AFHK210/AFHK240 frames
• ✔IP65 ingress test per IEC 60529 — single sealed housing covering all gear stages
• ✔Material certificate and dimensional drawing with every delivery

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EP-AFHK180 four-stage for the azimuth drive on a 2 MWp CPV tracker array — the motor is positioned vertically inside the mounting structure, output shaft driving the azimuth gear horizontally at 90 degrees. Required: 2,500 N·m, ratio ~8,000:1 from a 3,000 rpm servo to 0.37 rpm tracker azimuth. The four-stage AFHK covered this in a single sealed unit — no chain reduction, no compound gearbox. Korea Ever-Power's application team confirmed the exact stage configuration and available ratio values within the four-stage AFHK180 range before we placed the order. Three years, 24 tracker arrays, zero gearbox failures through three typhoon seasons.

EP-AFHKA180 three-stage for the slewing ring drive on a 50-ton overhead crane — motor vertical inside the crane bridge, AFHKA output horizontal driving the slewing pinion. Required: 3,200 N·m, ratio 600:1. Previous arrangement used an inline precision gearbox plus a separate bevel pair — two procurement lines, two maintenance points, two sets of seals to inspect. AFHKA replaced both with a single unit. The ≤2 arcmin backlash was confirmed by measurement on delivery. 26 months, 3 cranes, no slewing ring premature wear (the previous bevel pair had caused wear from backlash-induced shock loads at reversal).

EP-AFHKB140 three-stage for a continuous casting conveyor corner drive — motor perpendicular to the conveyor chain axis, AFHKB right-angle output driving the corner sprocket. Used AFHKB rather than AFHKA because our torque was 820 N·m — well below AFHKA's 1,650 N·m minimum. AFHKB starts at 55 N·m, which allowed us to select AFHKB140 at 820 N·m and 450:1 reduction without oversizing to a larger series. The enlarged shaft carries the chain tension; no outboard bearing in the corner station. 20 months continuous three-shift operation, no maintenance interventions.

CV Joint Drive Shafts

For solar tracker arrays where a single EP-AFHK four-stage unit drives multiple tracker rows through a common drive shaft — and for dual-motor heavy table configurations — precision heavy-duty CV joint drive shafts transmit the high torque from the EP-AFHK right-angle output to offset load positions without adding backlash at the connection.

Worm Gear Reducers

For vertical EP-AFHK applications in crane hoist mechanisms, vertical column drives, and port davit systems where gravity load holding is required on power-off, heavy-duty self-locking worm gear reducers downstream of EP-AFHK provide position holding at any position without an electromagnetic brake — the worm stage also extends the total reduction ratio beyond the EP-AFHK output for ultra-low speed applications.

Agricultural Gearboxes

For large-scale Korean agricultural machinery where EP-AFHKB provides the right-angle multi-stage reduction and downstream agricultural bevel gearboxes distribute power to multiple working heads — combine harvester main drive systems, large tillage implement drives — Korea Ever-Power's agricultural bevel gearboxes provide the multi-output stage matched to the high torque range of EP-AFHKB output shafts.

क्यूWhat is the difference between AFHKA and AFHKB three-stage? Both go to 1,000:1 and appear similar.

Both AFHKA and AFHKB are three-stage right-angle configurations reaching a maximum of 1,000:1 reduction, but they differ in their output torque range. AFHKA starts at a minimum of 1,650 N·m — it is the configuration for very high-torque three-stage applications. AFHKB starts at a much lower 55 N·m minimum, making it suitable for the wide range of medium-to-heavy applications where 100:1 (the AFHK two-stage maximum) is insufficient but where the application torque may be as low as 55 N·m. If your three-stage application torque is above 1,650 N·m, either AFHKA or AFHKB may apply — contact Korea Ever-Power for the specific frame recommendation. If it is below 1,650 N·m, AFHKB is the correct three-stage configuration.

क्यूDoes EP-AFHK offer P0 or P1 backlash grades?

No — EP-AFHK does not use P0/P1/P2 grade designation. The backlash specification is fixed at ≤2 arcmin for all configurations on all frames, with the sole exception of AFHK060 two-stage which specifies ≤3 arcmin. This is not a precision grade system — it is a single fixed specification. If sub-2 arcmin backlash precision is required at a right-angle output, the EP-AFR series (which provides P0 ≤1 arcmin) is the alternative, subject to EP-AFR's 2,000 N·m torque and i=200 ratio limits.

क्यूMy required ratio is 500:1 with 800 N·m output torque. Which configuration applies?

Your torque of 800 N·m and ratio of 500:1 together point to AFHKB three-stage: the AFHK two-stage maximum ratio is 100:1 (insufficient for 500:1), and AFHKA three-stage starts at 1,650 N·m (above your 800 N·m requirement). AFHKB three-stage covers 55–3,345 N·m at up to 1,000:1, which fits 800 N·m at 500:1 directly. Contact Korea Ever-Power with the exact ratio and torque to confirm the available AFHKB frame size and the specific available ratio combinations within the three-stage AFHKB configuration at AFHK100 or AFHK140 frames.

क्यूIs the EP-AFHK output shaft the same enlarged high-rigidity design as EP-AFR and EP-AFH?

Yes — the EP-AFHK output shaft is the same enlarged diameter high-rigidity design as EP-AFR and EP-AFH. This means direct gear, pulley, sprocket, or cam mounting is supported at the right-angle output without a separate outboard bearing housing, across all four AFHK configurations. As with EP-AFR, confirm the specific radial force at the output shaft with Korea Ever-Power's Korean application team before specifying — the force depends on the transmitted torque, the load radius, and the distance from the gearbox face to the load centre.

क्यूAre EP-AFHK210 and EP-AFHK240 available from stock, or made to order?

Large-frame EP-AFHK units — particularly AFHK210 and AFHK240 in multi-stage configurations — are typically produced to order rather than held in standard stock, given their specialised nature and the range of stage-count and ratio combinations available. Lead times for these configurations are longer than small and medium frames. Korea Ever-Power recommends engaging the Korean application engineering team early in the design phase to provide torque requirement, required ratio, and application description so that lead-time implications can be incorporated into the project schedule well before the required delivery date.