Червячный редуктор MRV050 | Червячная коробка передач

Compact Drive Solution for Smart Door & Window Automation

The MRV050 is a modified RV-frame червячный редуктор built for the precise, low-noise duty cycles you find behind sliding gates, automatic curtain walls, motorised skylights and architectural louvre systems. Within a single housing under 215 mm of mounting depth, this compact worm gear reducer carries motor inputs from 0.06 kW up to 7.5 kW, supports twelve standard ratios from i=5 through i=100, and delivers up to 280 Nm of output torque at the i=100 / 80B14 configuration.

Compared with XRV-frame units, the MRV050 worm gear reducer offers more flexible flange combinations (71B14 and 80B14 simultaneously available), an IP67-rated body for outdoor terrace and rooftop installations, and a 12–25 arc-min backlash window tight enough for closed-loop door positioning. It is well suited as a direct replacement for standard NMRV050 worm gear reducers on door operators, intelligent drive cabinets and small conveying lines. Within our broader NMRV worm gearbox lineup, the MRV050 sits as the go-to choice for low-noise architectural automation.

Performance Specifications & Ratio Chart

The data tables below list every standard ratio the MRV050 worm gear reducer ships with, along with output speed n₂, output torque Mn₂, allowable radial load Fr₂, matched motor power P₁ and total assembly length L. Use these worm gear reducer numbers directly for sizing — they reflect tested catalogue values, not theoretical maxima. The mounting-dimension table further down covers both IP56 and IP67 motor flange variants for 71B14 and 80B14 frames.

Symbols: i = total reduction ratio, n₂ = output speed (rpm), Mn₂ = output torque (Nm), Fr₂ = allowable radial load on output shaft (N), P₁ = matched motor input power (kW), L = total length with motor mounted (mm).

How a Worm Drive Moves a 300 kg Sliding Door

Inside the MRV050 worm gear reducer housing, a hardened-steel worm shaft meshes with a tin-bronze worm wheel at a 90-degree axis crossing. As the input shaft turns, the worm thread slides against the bronze wheel teeth, converting high-RPM motor rotation into low-speed, high-torque output. With a single mesh stage, the worm gear reducer reaches 100:1 reduction — a ratio that would normally demand two helical stages and twice the gearbox length.

For a 300 kg motorised sliding door running on a 6 m track, a typical MRV050 worm gear reducer setup uses a 0.37 kW motor, an i=30 ratio and a 24 mm hollow output shaft. From the spec table, that combination delivers about 47 rpm at the drive pinion and 71–94 Nm of output torque depending on motor frame — enough to break track friction even when grease has stiffened in winter. The worm geometry also produces inherent damping: when the motor stops, the door does not coast, which is critical for safety on heavy gates.

Why MRV050 Outperforms a Standard NMRV050 on Door Duty

The MRV050 worm gear reducer was developed specifically to address weaknesses that surface when a generic NMRV worm reducer is dropped into door, gate and louvre actuators: noise on quick reversals, water ingress at outdoor terminals, and limited motor-flange flexibility. Each of the four advantages below has a measurable impact on the bill-of-material cost of a finished door operator.

Where the MRV050 Worm Gear Reducer Earns Its Place

Although named for electric doors and windows, the MRV050 worm gear reducer is deployed across a wider spread of low-to-medium-power motion control niches in Korea, Japan and Southeast Asia. The five most common application areas, with the typical drive configuration each calls for, are summarised below.

Sliding Doors & Automatic Gate Operators

For sliding gates up to 600 kg leaf weight, an MRV050 worm gear reducer with i=30 paired with a 0.55 kW brake motor produces the right balance of starting torque and creep speed. Worm self-damping eliminates the end-of-travel rebound common with helical drives — the door stops cleanly even if the limit switch fires late.

Architectural Skylights & Louvre Walls

Pivoting glass louvre walls in Seoul and Busan high-rises typically run the MRV050 worm gear reducer at i=80 with a 0.25 kW motor, delivering ~17 rpm at the parallel-linkage drive shaft. IP67 sealing matters here — facade exposure to driven rain is constant, and the gearbox sits inside the wall cavity where servicing is awkward.

Pharmaceutical & Cleanroom Conveyors

Wash-down vial-handling and unit-dose lines pair the IP67 worm gear reducer housing with 0.18–0.37 kW motors at i=15 or i=20, producing 90–140 rpm to match line indexing speeds. The synthetic PAG fill is H1 food-grade certified, which keeps validation paperwork simpler.

Packaging & Small-Format Carton Lines

Wraparound case packers and carton glue stations run the MRV050 worm gear reducer at i=10 or i=12 with 0.37–0.55 kW motors. Operators in Daegu food plants report zero registration drift after months of three-shift use — credit goes to the worm geometry's positive engagement and tight backlash window.

Intelligent Drive & Robotics Auxiliaries

Tool-change carousels, AGV lift platforms and small palletising rotaries use the compact 200 mm-deep envelope where larger helical-bevel units cannot fit. The 8024 (P₁=0.75 kW) variant is the popular choice for these auxiliary axes.

Worm vs Helical, Bevel & Planetary — Engineer's Trade-Off Table

Choosing the right reducer family is rarely about which is "best" — it is about matching duty class, axis layout and cost expectation. The comparison below uses single-stage units sized to deliver about 100 Nm output torque, the typical sweet spot for door operators.

For a door operator running roughly 50 cycles per hour, the lower efficiency of the worm gear reducer is not a meaningful energy concern — the duty cycle is too short. Self-locking, low noise and price weigh much more in the decision matrix. That is exactly why door OEMs across the Korean peninsula default to a worm gear reducer, not a planetary or bevel-helical alternative.

How to Size MRV050 for Your Door — Step-by-Step Worksheet

Follow this six-step worksheet before placing an order for an MRV050 worm gear reducer. The same sequence is used by our application engineers when they configure units for Korean integrators, and it catches more than 90% of mismatches at the quotation stage.

1. 1
   Compute door inertia and friction load. Multiply leaf mass by 0.5 (rolling friction coefficient for clean rails) to get the steady-state pull force at the drive pinion. For a 300 kg door, that is roughly 150 N at the rim.
2. 2
   Convert to required output torque. Multiply rim force by drive-pinion radius. A 50 mm pinion driving a 150 N load needs about 7.5 Nm continuous, or roughly 22 Nm with a service-factor of 3 for start-up surge.
3. 3
   Pick a target travel speed. For a 6 m sliding gate completing its stroke in 12 seconds, the linear speed is 0.5 m/s. With a 50 mm pinion, that maps to about 190 rpm at the output shaft.
4. 4
   Match the ratio. With a 1400 rpm motor and 190 rpm target output, the closest ratio is i=7.5 — but at this ratio the worm gear reducer is not self-locking. If self-locking is required for safety, step up to i=15 and pair with a faster motor or accept slower travel.
5. 5
   Confirm motor power. Cross-check the chosen ratio against the P₁ column in the spec table. For i=15 with 22 Nm continuous torque, the 0.37 kW row is sufficient; the 0.55 kW gives extra headroom for cold-morning starts.
6. 6
   Validate radial load. The Fr₂ column gives allowable radial force at the output shaft. For a chain-and-sprocket take-off, keep working load below 60% of Fr₂ to give bearing life beyond 20,000 hours.

Backlash Behaviour & Smooth-Stop Tuning

A common complaint on cheap NMRV-class door drives is end-of-travel jolt: when the limit switch cuts power, the door rebounds 10–15 mm before settling. The MRV050 worm gear reducer housing is built with a backlash window of 12–25 arc-minutes (depending on ratio), tight enough that closed-loop door controllers can position the leaf to within ±2 mm without dithering.

For installations where even tighter positioning is needed — for example automatic darkroom doors or high-speed roll-up curtains — we offer a factory-tightened backlash variant of the MRV050 worm gear reducer at no extra cost when ordered with the unit. Field tightening is also possible via the eccentric bushing on the wheel side, but it requires a 0.05 mm dial gauge and roughly 30 minutes per unit. We document the procedure in the maintenance pack shipped with every order.

Companion Components for a Complete Drive Train

Most door and conveyor projects need more than the gearbox alone. The four companion ranges below ship from the same Korean warehouse and are routinely ordered together with the MRV050 worm gear reducer. As a dedicated Корейский производитель червячных редукторов, we keep paperwork in English with optional Korean translation.

Worm and worm wheel pairs in tin-bronze and phosphor-bronze keep service rebuilds fast — when only the wheel has reached its wear limit, a re-tooth costs less than a full gearbox replacement. Common MRV050 sizes are kept on shelf at our Korean warehouse. Worm and worm wheel pairs documentation includes hardness specs, surface finish data and contact pattern photos.

PTO and CV joint drive shafts are needed when the worm gear reducer sits remotely from the motor — typical of long curtain-wall installations where the motor is hidden in a service riser and the gearbox at the louvre frame. Order matched assemblies via Валы отбора мощности и приводные валы ШРУСов.

Frequently Asked Questions

The questions below cover the topics our applications team answers most often during MRV050 quotations and post-sale support — from motor sizing and self-locking behaviour to lubricant choice and Korean winter operation. Each answer reflects field experience rather than catalogue copy.

What Korean & Asian Customers Are Saying

Below is a sample of customer feedback from across Korea, Japan, Vietnam and Thailand — collected over the past twelve months from MRV050 worm gear reducer installations spanning shipyards, building automation, pharma and small-format packaging. Names and locations are real; the technical details have been preserved word-for-word from the original correspondence with permission.