Double NMRV Two-Stage Worm Gearbox Ultra-Low Speed Reducer

Double NMRV Two-Stage Worm Gearbox Ultra-Low Speed Reducer

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Double NMRV Two-Stage Worm Gearbox Ultra-Low Speed Reducer

The Double NMRV Two-Stage Worm Gearbox is an advanced ultra-low-speed reduction solution, combining two NMRV worm gear units in series to achieve extremely high gear reduction ratios in a compact and efficient configuration. Designed for precision, high-torque output, and space-saving integration, this reducer is ideal for demanding applications that require controlled motion at speeds as low as a few revolutions per minute—or even less.

Utilizing high-performance worm gears and an aluminum alloy modular housing, the double-stage NMRV gearbox offers exceptional versatility and mechanical efficiency while keeping noise and vibration at a minimum. The sealed, maintenance-free design supports 24/7 operation in industrial automation, packaging systems, robotics, and other motion-critical systems.

Whether you’re building a conveyor system, a rotary indexing table, or a low-speed torque application, the Double NMRV reducer delivers long-term performance with quiet operation and reliable precision.

Double Worm Reduction Gearbox Size Chart:

NMRV+NMRV
　 025-030 025-040 030-040 030-050 030-063 040-075 040-090 050-110 063-130 063-150
A 70 70 80 80 80 100 100 120 144 144
B 45 45 55 55 55 70 70 80 95 95
G1 63 78 78 92 112 120 140 155 170 200
H 40 50 50 60 72 86 103 127.5 147.5 170
I 30 40 40 50 63 75 90 110 130 150
R 57 71.5 71.5 84 102 119 135 167.5 187.5 230
H2 35 35 40 40 40 50 50 60 72 72
I2 25 25 30 30 30 40 40 50 63 63
N2 22.5 22.5 29 29 29 36.5 36.5 43.5 53 53
R2 48 48 57 57 57 71.5 71.5 84 102 102
Z 100 115 122 132 145 167.5 184.5 226 245 275
Kg 1.9 3 3.5 4.7 7.4 11.3 15.3 38.5 54.2 90.2
Kg/Weight without motor

Double Worm Reduction Gearbox Mounting Position:

AS1, AS2, BS1, BS2, VS1, VS2, PS1, and PS2 for options to meet different installation conditions.

Double Worm Reduction Gearbox Specifications Parameter: 

*n1=1400rpm
i n2 kW1   M2
(Nm)		 i1 i2 i n2 kW1   M2
(Nm)		 i1 i2
NRV
030/040		 300 4.7 0.08   73 10 30 NRV
040/090		 300 4.7 0.56   610 7.5 40
400 3.5 0.06   65 10 40 400 3.5 0.43   610 10 40
500 2.8 0.04   61 20 25 500 2.8 0.34   560 10 50
600 2.3 0.04   73 20 30 600 2.3 0.3   610 15 40
750 1.9 0.04   73 25 30 750 1.9 0.23   560 15 50
900 1.6 0.03   73 30 30 900 1.6 0.19   505 15 60
1200 1.2 0.02   65 30 40 1200 1.2 0.17   610 30 40
1500 0.9 0.02   73 50 30 1500 0.93 0.14   560 30 50
1800 0.8 0.02   73 60 30 1800 0.78 0.11   505 30 60
2400 0.58 0.01   65 60 40 2400 0.58 0.11   610 60 40
3200 0.4 0.01   65 80 40 3000 0.47 0.08   560 60 50
4000 0.4 0.01   33 50 80 4000 0.35 0.08   460 50 80
5000 0.28 0.01   29 50 100 5000 0.28 0.06   410 50 100
NRV
030/050		 300 4.7 0.15   145 10 30 NRV
050/110		 300 4.7 0.95   1100 10 30
400 3.5 0.1   124 10 40 400 3.5 0.69   1030 10 40
500 2.8 0.09   120 10 50 500 2.8 0.56   1000 10 50
600 2.3 0.08   145 20 30 600 2.3 0.48   1030 15 40
750 1.9 0.07   145 25 30 750 1.9 0.43   1100 25 30
900 1.6 0.06   145 30 30 900 1.6 0.38   1100 30 30
1200 1.2 0.04   124 30 40 1200 1.2 0.27   1030 30 40
1500 0.93 0.04   145 50 30 1500 0.93 0.28   1100 50 30
1800 0.78 0.04   145 60 30 1800 0.78 0.23   1100 60 30
2400 0.6 0.03   124 60 40 2400 0.58 0.17   1030 60 40
3000 0.5 0.02   120 60 50 3000 0.47 0.14   1000 60 50
4000 0.35 0.02   82 50 80 4000 0.35 0.12   780 50 80
4800 0.29 0.02 82 60 80 5000 0.28 0.09 710 50 100
NRV
030/063		 300 4.7 0.24 230 7.5 40 NRV
063/130		 300 4.7 1.48 1760 10 50
400 3.5 0.19 230 10 40 400 3.5 1.09 1650 10 40
500 2.8 0.15 216 10 50 500 2.8 0.86 1550 10 50
600 2.3 0.13 230 15 40 600 2.3 0.76 1650 15 40
750 1.9 0.11 216 15 50 750 1.9 0.66 1760 25 30
900 1.6 0.09 198 15 60 900 1.6 0.58 1760 30 30
1200 1.2 0.08 230 30 40 1200 1.2 0.43 1650 30 40
1500 0.93 0.06 216 30 50 1500 0.93 0.39 1760 50 30
1800 0.78 0.05 198 30 60 1800 0.78 0.35 1760 60 30
2400 0.58 0.05 230 60 40 2400 0.58 0.25 1650 60 40
3000 0.47 0.04 216 60 50 3000 0.47 0.2 1550 60 50
4000 0.35 0.03 172 50 80 4000 0.35 0.15 1220 50 80
5000 0.28 0.02 150 50 100 5000 0.28 0.11 1100 50 100
NRV
040/075		 300 4.7 0.36 390 10 30 NRV
063/150		 150 9.3 3.4 2340 10 15
400 3.5 0.27 360 10 40 200 7 2.7 2340 10 20
500 2.8 0.21 320 10 50 250 5.6 1.9 2050 10 25
600 2.3 0.19 390 20 30 300 4.7 1.9 2340 10 30
750 1.9 0.16 390 25 30 400 3.5 1.8 2670 10 40
900 1.6 0.14 390 30 30 500 2.8 1.4 2330 10 50
1200 1.2 0.11 360 30 40 600 2.3 1.3 2670 15 40
1500 0.93 0.1 390 50 30 750 1.9 1 2330 25 30
1800 0.78 0.09 390 60 30 900 1.6 0.7 2100 30 30
2400 0.58 0.07 360 60 40 1200 1.2 0.7 2670 50 40
3000 0.47 0.05 320 60 50 1800 0.8 0.4 2100 60 30
4000 0.35 0.04 250 50 80 2400 0.6 0.5 2670 60 40
5000 0.28 0.03 230 50 100 3000 0.5 0.3 2330 60 50
4000 0.4 0.2 1880 50 80
5000 0.3 0.2 1650 50 100

Available Models

Primary Stage (Input) Secondary Stage (Output) Combined Ratios Available
NMRV030 NMRV030 / 040 100:1 ~ 1200:1
NMRV040 NMRV050 / 063 200:1 ~ 2000:1
NMRV063 NMRV075 / 090 300:1 ~ 5000:1
NMRV075 NMRV090 / 110 400:1 ~ 10,000:1

Key Product Features of Double Worm Gearbox:

Ultra-Low Speed Output

With combined worm gear stages, this worm gearbox can reduce speed to under 1 RPM, making it ideal for precise motion control, slow conveyor drive, or rotating platforms.

Compact Double-Stage Design

Despite its high reduction ratio, the worm gearbox remains lightweight and compact, making it easy to install in tight spaces or modular machines.

Whisper-Quiet Operation

Worm gear drives are naturally smooth and quiet due to sliding contact. With two worm stages and precise machining, noise is minimized even under load.

Maintenance-Free Construction

Factory-filled with synthetic lubricant, the worm gearbox requires no oil change or inspection for up to 10,000 hours of operation in normal conditions.

Strong, Corrosion-Resistant Housing

Die-cast aluminum alloy ensures good mechanical rigidity while providing corrosion resistance, even in slightly humid or chemically exposed environments.

Flexible Input and Output Options

Available in shaft input, IEC/NEMA flange input, solid or hollow output shafts, as well as torque arm mounting for universal applications.

Double Worm Reduction Gearbox Application:

RV Series Worm Gearbox Application

The Double NMRV Two-Stage Worm Gearbox is engineered for industrial environments that demand slow, powerful, and precise rotary motion. Common applications include:

  • Rotary Indexing Tables: Used in machining centers, automation systems, or inspection stations requiring precise, timed movement.
  • Low-Speed Conveyors: Essential for moving fragile materials, packaging components, or in food processing environments where slow speed ensures control and safety.
  • Winches and Lifting Systems: Excellent for slow-lifting hoists or platform elevators where torque is critical, and speed must be tightly controlled.
  • Agricultural Equipment: In seeders, spreaders, or crop-handling systems, where low-speed rotation with consistent torque is crucial.
  • Solar Panel Positioning Systems: Used in solar trackers where slow, continuous angle adjustment is necessary based on the sunlight angle.
  • Printing, Textile & Labeling Machines: For smooth, slow feed motion without jerk or vibration.
  • Medical & Laboratory Devices: Ultra-low-speed drives needed for mixing, sample handling, or sensitive movement environments.

Installation Instructions

Proper installation is key to achieving optimal performance and long service life of the double-stage worm gearbox.

1. Preparation

  • Unpack and inspect both NMRV units.

  • Ensure both worm gearboxes are the correct size and reduction ratio for your application.

  • Verify the input type (shaft or flange) and output shaft configuration.

2. Mounting Configuration

  • Determine desired mounting orientation: horizontal (B3), vertical (V5/V6), or flange (B5).

  • Mount gearbox on a clean, flat, and vibration-free surface.

  • Use high-tensile mounting bolts (grade 8.8 or above) and torque to specifications.

  • Avoid mounting the gearbox near heat sources or in enclosed, non-ventilated areas.

3. Input Motor Connection

  • If using a flange motor, ensure alignment between the motor shaft and the gearbox bore.

  • Secure the motor using the proper mounting bolts and anti-loosening washers.

  • For shaft input, use flexible couplings and ensure radial/axial alignment.

4. Output Shaft Setup

  • For hollow shafts: insert the driven shaft completely and secure with a key and locking ring.

  • For solid output shafts, ensure a tight-fit coupling or mechanical integration.

  • Optional torque arms or output flanges can be used depending on the mounting style.

5. Ventilation and Lubrication

  • Remove the red oil plug and install the supplied breather plug in the topmost position.

  • Make sure air circulation is not blocked, especially around cooling fins.

  • Do not open or refill oil unless operating under abnormal conditions.

6. Start-Up & Inspection

  • Manually rotate the input shaft to ensure smooth gear engagement.

  • Gradually start the drive to monitor noise and vibration.

  • Recheck bolt tightness after 100 hours of operation.

Customer Feedback:

“This gearbox is perfect for our rotary welding positioners—smooth, reliable, and the low speed gives us total control.”
— Carlos M., Automation Engineer, Spain

“We run a labeling system with a 0.5 RPM rotation, and the double-stage reducer gave us everything we needed. No vibration, no maintenance.”
— Emily L., Packaging Line Manager, Canada

“We’ve installed over 20 units in our solar tracking systems. Zero failures in 2 years, even in outdoor environments.”
— Zhou Y., Green Energy Project Manager, China

Frequently Asked Questions (FAQ)

Q1: Why choose a double-stage worm gearbox instead of a planetary reducer?

A: Worm gears offer better damping, quieter operation, and cost-effectiveness at ultra-low speeds. They’re ideal for non-reversible motion and are often more compact than planetary setups for high reduction.

Q2: How do I calculate the total gear ratio?

A: Multiply the ratio of the first stage by the ratio of the second. Example: 40:1 (stage 1) × 100:1 (stage 2) = 4000:1 total.

Q3: Can I mount this gearbox vertically?

A: Yes. Vertical and horizontal mounting are both supported. Make sure to install the breather plug in the correct location based on orientation.

Q4: Is it suitable for reversing motion?

A: Worm gear reducers are not ideal for high-frequency reversing due to sliding friction. For slow, intermittent reversing, they can work but may wear faster.

Q5: Is this gearbox self-locking?

A: At high ratios, many worm gear reducers exhibit self-locking characteristics, preventing back-driving. However, always confirm based on application torque and load.

About Ever-Power Transmission Group

Worm Gearbox Factory 1

Ever-Power is a global manufacturer and exporter of mechanical power transmission products. With more than 15 years of experience in gear technology, we specialize in worm gearboxes, helical reducers, planetary drives, couplings, and complete transmission systems.

Worm Gearbox Factory 2

Our Advantages:

  • ✅ ISO 9001:2015 Certified

  • ✅ In-house design and machining capability

  • ✅ Large inventory for fast shipping

  • ✅ OEM & ODM support for custom solutions

  • ✅ Global logistics network & technical support

We serve clients in industrial automation, agriculture, renewable energy, food processing, and more.

Gear Reducers

World class gear manufacturing capabilities, quality material suppliers, and a state of the art quality process allows EPT to offer the highest level of precision, durability and endurance. The EPT Planetary Reducers are designed and built for advanced high speed low backlash applications. The EPT manufacturing processes allows us to offer exceptional shock load capacities and various mounting options.

Surface Treatment

Annealing, natural canonization, heat treatment, polishing, nickel plating, chrome plating, zinc plating,yellow passivization, gold passivization, satin, Black surface painted etc.

Processing Method

CNC machining, punch,turning, milling, drilling, grinding, broaching, welding and assembly

QC & Certificate

Technicians self-check in production,final-check before package by professional Quality inspector
ISO9001:2008 , ISO14001:2001,ISO/TS 16949:2009

Package & Lead Time

Size: Drawings
Wooden Case/Container and pallet, or as per customized specifications.
15-25days samples. 30-45days offcial order
Port: Shanghai/Ningbo port

FAQ

Q: Are you trading company or manufacturer ?
A: Our group consists in 3 factories and 2 abroad sales corporations.

Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but do not pay the cost of freight.

Q: How long is your delivery time ? What is your terms of payment ?
A: Generally it is 40-45 days. The time may vary depending on the product and the level of customization. For standard products, the payment is: 30% T/T in advance ,balance before shipment.

Q: What is the exact MOQ or price for your product ?
A: As an OEM company, we can provide and adapt our products to a wide range of needs.Thus, MOQ and price may greatly vary with size, material and further specifications; For instance, costly products or standard products will usually have a lower MOQ. Please contact us with all relevant details to get the most accurate quotation.

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