Redutor de engrenagem helicoidal com entrada por eixo EP-NRV | Entrada por eixo maciço

EP-NMRV — IEC Motor Flange Input

The motor bolts directly to an IEC flange on the gearbox housing — no coupling required. Fast, alignment-free motor attachment. Requires an IEC-flanged motor (56B14, 63B14, 71B14, 80B14, etc.). The most common configuration for standard AC motor + redutor de engrenagem helicoidal combinations.

✓ Best for: standard AC motor + gearbox directly coupled

EP-NRV — Solid Shaft Input

A solid input shaft extends from the worm shaft — any drive source that can be connected via shaft coupling (jaw coupling, rigid coupling, chain drive) can drive this redutor de engrenagem helicoidal. No IEC flange restriction. Accepts petrol engines, hydraulic motors, servo motors with non-IEC output, or inline shaft connections from other machines.

✓ Best for: non-IEC drives, engines, coupling-connected motors

worm gear reducer working principle — solid shaft drives worm shaft; worm wheel provides right-angle reduction

Connect Any Drive Source

Any motor, engine, or shaft with a standard shaft diameter and keyway can drive this redutor de engrenagem helicoidal via shaft coupling. Petrol engine, hydraulic motor, servo motor with non-IEC shaft, DC motor, or upstream machine shaft — no IEC flange pattern restriction.

Hollow Shaft Output — No Output Coupling

The standard hollow shaft output slides directly onto the driven equipment shaft — eliminating the output coupling and reducing drive length. The same hollow shaft advantage as the NMRV series, but with a solid shaft input on this redutor de engrenagem helicoidal instead of a flange input.

Self-Locking at ≥ 20:1

Same self-locking characteristic as the NMRV series — output holds position when motor power is removed at ratios of 20:1 and above. Useful for positioning mechanisms, vertical actuators, and agricultural equipment where load-hold without a separate brake is needed from this compact redutor de engrenagem helicoidal.

All Mounting Orientations

The aluminium housing can be mounted in all orientations — horizontal, vertical, inverted, or inclined. The worm shaft tail extension option (VS variant) adds dual-input capability to the NRV frame — encoder and hand-wheel mounting at the shaft extension while the solid input shaft connects the drive source.

What is the main difference between EP-NRV and EP-NMRV worm gear reducers?

EP-NMRV = IEC motor flange input (motor bolts directly to the housing without a coupling). EP-NRV = solid shaft input (a shaft coupling connects any drive source to the worm shaft). Internal gears, ratios, output configurations, and housing dimensions are identical at the same frame size. Choose EP-NMRV for standard IEC motors; choose EP-NRV for any other drive source or when a coupling connection is preferred for easier motor replacement on this redutor de engrenagem helicoidal.

Can the EP-NRV accept a servo motor?

Yes. A servo motor with a shaft output connects to the NRV via a zero-backlash or low-backlash coupling. For precision servo applications where backlash matters, note that the standard EP-NRV redutor de engrenagem helicoidal is a general-purpose unit — it does not have the certified backlash classes (Standard/A/AR) of the VRV030 precision series. For precision servo drives requiring ≤0.13° or ≤0.066° backlash, the VRV030 series is the appropriate choice.

Is the EP-NRV available with a worm shaft tail extension (VS variant)?

Yes — the EP-NRV-VS variant combines solid shaft input with a worm shaft tail extension, creating a dual-accessible-end shaft on the NRV frame. This adds encoder or hand-wheel mounting capability to the shaft input configuration. Contact Korea Ever-Power for the NRV-VS variant specifically — it provides the same VS functionality as the NMRV-VS but on the solid shaft input redutor de engrenagem helicoidal frame.

What coupling type is recommended for the EP-NRV input shaft?

For standard AC motor connection: jaw coupling with polyurethane spider — low cost, adequate for most conveyor and packaging drives. For higher torque transmission or where shock loading is present: rigid flange coupling or chain coupling. For precision speed control with VFD: flexible disc coupling to minimise angular misalignment contribution to drive irregularity. Provide motor shaft diameter, NRV input shaft diameter, and maximum torque when contacting Korea Ever-Power for coupling confirmation.

Can the EP-NRV be used on mobile or agricultural equipment?

Yes — this is one of the primary advantages of the NRV solid shaft input design. Petrol engines, diesel engines, and PTO shafts all output via a shaft that can couple to the NRV input. The aluminium housing is lightweight (critical for mobile equipment weight budgets) and the self-locking at ≥ 20:1 holds position when the engine stops. Ensure the drive coupling accommodates any misalignment between the engine shaft and the redutor de engrenagem helicoidal input shaft in mobile installations.

What is the maximum input shaft speed for the EP-NRV?

The EP-NRV worm gear reducer is rated for standard industrial motor speeds — nominal 1,000–1,500 rpm input is typical. Maximum input speed varies by frame size and ratio; as a guideline, do not exceed 3,000 rpm input on small frames (025–050) or 1,500 rpm on larger frames (090–150) without confirming with Korea Ever-Power. Higher input speeds increase oil temperature and reduce lubrication effectiveness at the worm mesh. For input speeds above 1,500 rpm, specify synthetic lubricant.

What is the oil fill grade and change interval for the EP-NRV?

ISO VG 220 mineral gear oil for 0–40°C ambient; synthetic ISO VG 220 for higher ambient temperatures or above-rated input speeds. Change at 100 hours (first service — run-in flush). Subsequent changes: every 2,000–3,000 hours or 12 months continuous service. The warranty for this redutor de engrenagem helicoidal is 18 months from shipment under normal operating conditions as defined by Korea Ever-Power. Contact [email protected] for warranty claims with unit serial number and failure description.

"Used EP-NRV050 at 25:1 to replace a worn gearbox on a legacy packaging machine where the motor has a non-IEC output shaft. The NRV solid shaft input accepted a jaw coupling to the existing motor shaft — no motor replacement needed. The worm gear reducer was running within 2 hours of delivery. Perfect retrofit solution."

Cho Hyun-kiMaintenance Engineer, Gyeonggi-do Packaging Plant

"EP-NRV063 at 40:1 for a solar panel positioning mechanism driven by a servo motor without an IEC flange. The solid shaft input accepted a bellows coupling directly. Self-locking holds panel angle at night without power. The worm gear reducer has been on outdoor rooftop installations for 16 months without any corrosion or oil leakage issues."

Park Soo-inSystems Engineer, Incheon Solar Installation Co.

"NRV090 at 20:1 driven by a small petrol engine on mobile agricultural spraying equipment. Hollow shaft output slides onto the spray pump shaft. The shaft input coupling absorbs vibration from the engine. The worm gear reducer has been used seasonally for 3 years, no issues with the aluminium housing or seals despite field conditions."

Kim Tae-ryongEquipment Owner, Chungnam Agricultural Cooperative

"Our lab automation equipment uses a DC brushless motor with a non-IEC output — the EP-NRV030 at 15:1 was the only compact worm gear reducer that accepted our motor via coupling without requiring an adapter flange. The hollow shaft output gave us a compact, coupling-free output connection to the driven stage. Very satisfied with the combination."

Lee Jae-wonR&D Engineer, Daejeon Life Sciences Equipment OEM

"12 units EP-NRV040 at 50:1 for a display rack rotation drive in a retail store — driven by a small DC motor with a 6 mm shaft. The NRV solid shaft input accepted a simple clamp coupling to the 6 mm shaft. Quiet operation below 40 dB(A), self-locking holds the rack between rotation cycles. The compact worm gear reducer fits inside the display pedestal without visibility."

Jung So-yeonProduct Designer, Seoul Retail Display Equipment Co.

"Korea Ever-Power confirmed dimensional drawings for the EP-NRV075 in one business day. The worm gear reducer arrived with the correct bore size and keyway matching our drive shaft exactly. Tin copper worm wheel quality is noticeably better than the previous generic unit — smoother operation, lower noise from day one. Will specify Korea Ever-Power as standard for all future NRV applications."

Ha Min-joonProcurement Engineer, Busan Industrial Automation Co.