Worm gear reducer technology serves as the backbone for many high-torque, low-speed industrial applications requiring compact footprints and reliable performance. The EP-NMRV series provides a versatile solution for engineers seeking to bridge the gap between high-speed motors and heavy-duty mechanical loads. By utilizing an aluminium worm gearbox design in smaller frame sizes, this equipment offers excellent thermal dissipation and weight advantages for mobile or space-constrained setups. As requirements grow more demanding, larger models transition to robust iron bodies to handle increased stress without compromising structural integrity during continuous operation.

Choosing the right speed reduction solution involves balancing input power, output torque, and spatial constraints within your existing machinery layout. This model series is designed to integrate seamlessly with various motor types, including those requiring a worm gearbox with IEC motor flange compatibility. Whether you are managing a simple conveyor or a complex assembly line, the ability to select specific ratios allows for fine-tuned control over mechanical movement. Ever-Power focuses on providing high-quality components that maintain consistent performance under varying load conditions, making this equipment a dependable choice for international markets including the United States and Germany.

Product Snapshot – Worm Gearbox With IEC Motor Flange

Achieve precise speed control through a wide range of available ratios from 7.5 to 100. Select the ideal frame size based on your specific power needs ranging from 0.09 kW up to 7.5 kW. Ensure long-term reliability by choosing between aluminium or cast iron housing options depending on your environment.

Key figures shown for NMRV worm gearbox.

Rated input power (kW): 0.09~0.55
Output speed at i=7.5, n1=1400 rpm (rpm): 187
Output speed at i=100, n1=1400 rpm (rpm): 14
Output torque at i=7.5, n1=1400 rpm (N·m): 41
Output torque at i=100, n1=1400 rpm (N·m): 29

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Specifications & Parameters – Worm Gear Speed Reducer

The specification table below covers the figures buyers ask about first. Available models include NMRV worm gearbox, worm gear speed reducer, aluminium worm gearbox. Read it alongside your load profile and production plan.

Parameter	EP-NMRV040	EP-NMRV050	EP-NMRV063	EP-NMRV075	EP-NMRV110	EP-NMRV130
Centre distance (mm)	40	50	63	75	110	130
Gear ratio range (i)	7.5~100	7.5~100	7.5~100	7.5~100	7.5~100	7.5~100
Rated input power (kW)	0.09~0.55	0.12~1.5	0.18~2.2	0.25~4.0	0.55~7.5	0.75~7.5
Rated input speeds (rpm)	900 / 1400 / 2800	900 / 1400 / 2800	900 / 1400 / 2800	900 / 1400 / 2800	900 / 1400 / 2800	900 / 1400 / 2800
Output speed at i=7.5, n1=1400 rpm (rpm)	187	187	187	187	187	187
Output speed at i=100, n1=1400 rpm (rpm)	14	14	14	14	14	14
Output torque at i=7.5, n1=1400 rpm (N·m)	41	77	130	235	532	780
Output torque at i=100, n1=1400 rpm (N·m)	29	52	94	206	473	765
Efficiency at i=7.5, n1=1400 rpm (%)	86	88	88	91	90	91
Efficiency at i=100, n1=1400 rpm (%)	48	48	49	63	63	66
Weight (kg)	2.3	3.5	6.2	9	35	48
Housing material	Aluminium case and flanges, steel worm, bronze worm wheel crown	Aluminium case and flanges, steel worm, bronze worm wheel crown	Aluminium case and flanges, steel worm, bronze worm wheel crown	Aluminium case and flanges, steel worm, bronze worm wheel crown	Iron body and flanges, steel worm, bronze worm wheel crown	Grey cast iron G200, protective powder coating
Lubricant	Synthetic ISO VG 320	Synthetic ISO VG 320	Synthetic ISO VG 320	Synthetic ISO VG 320	Synthetic ISO VG 220	Synthetic ISO VG 220
Worm wheel material	ZCuSn10Pb1 tin bronze	ZCuSn10Pb1 tin bronze	ZCuSn10Pb1 tin bronze	ZCuSn10Pb1 tin bronze	ZCuSn10Pb1 tin bronze	ZCuSn10Pb1 tin bronze
Worm shaft material	20CrMnTi, carburized and quenched	20CrMnTi, carburized and quenched	20CrMnTi, carburized and quenched	20CrMnTi, carburized and quenched	20CrMnTi, carburized and quenched	20CrMnTi, carburized and quenched
Output shaft material	Steel 45#	Steel 45#	Steel 45#	Steel 45#	Steel 45#	Steel 45#
Input bore diameter (mm)	Φ9(Φ11,Φ14)	Φ11(Φ14,Φ19)	Φ14(Φ19,Φ24)	Φ14(Φ19,Φ24,Φ28)	Φ19(Φ24,Φ28,Φ38)	Φ24(Φ28,Φ38)
Input shaft diameter (mm)	Φ11	Φ14	Φ19	Φ24	Φ28	Φ30
Output bore diameter (mm)	Φ18(Φ19)	Φ25(Φ24)	Φ25(Φ28)	Φ28(Φ35)	Φ42	Φ45
Output shaft diameter (mm)	Φ18	Φ25	Φ25	Φ28	Φ42	Φ45
Mounting positions	B3, B6, B7, B8, V5, V6	B3, B6, B7, B8, V5, V6	B3, B6, B7, B8, V5, V6	B3, B6, B7, B8, V5, V6	B3, B6, B7, B8, V5, V6	B3, B6, B7, B8, V5, V6
IEC motor flange options	56B14, 63B14, 63B5, 71B14, 80B14, etc	56B14, 63B14, 63B5, 71B14, 80B14, etc	56B14, 63B14, 63B5, 71B14, 80B14, etc	56B14, 63B14, 63B5, 71B14, 80B14, etc	56B14, 63B14, 63B5, 71B14, 80B14, etc	56B14, 63B14, 63B5, 71B14, 80B14, etc

Note: Figures can vary with configuration and operating conditions — confirm against the official technical drawings or with our team before ordering.

Reference Standards & Target Markets:

Target markets for this worm gear reducer line: United States, Germany, Brazil, Australia. Buyers in these markets can request dimensional drawings and the selection data behind the table above before placing an order.

Published engineering standards that apply to this product type. They are listed for selection reference — consult the source document for the authoritative text.

ISO/TR 14521:2010 — Gears — Calculation of load capacity of wormgears. Specifies equations for calculating the load capacity of cylindrical worm gears, covering load ratings associated with wear, pitting, worm deflection, tooth breakage and temperature. Scuffing and other failure modes are not covered. Valid for tooth-surface sliding velocities up to 25 m/s and contact ratios of 2,1 or greater; dimensioning rules apply to centre distances of 50 mm and larger. Source
ISO 1122-2:1999 — Vocabulary of gear terms — Part 2: Definitions related to worm gears geometry. Cited as a normative reference by ISO/TR 14521:2010; defines the geometry terminology used for worm gearing. Source
ISO 701:1998 — International gear notations — Symbols for geometrical data. Cited as a normative reference by ISO/TR 14521:2010; fixes the symbols used for gear geometrical data. Source

Worm Gear Reducer Key Features – NMRV Worm Gearbox

Robust Material Construction

The internal architecture of this machine relies on high-grade materials to prevent premature wear. A steel worm works in tandem with a bronze worm wheel crown, which significantly reduces friction and heat buildup during heavy cycles. The use of carburized and quenched 20CrMnTi for the worm shaft provides the necessary surface hardness to withstand constant contact. This combination of metallurgy ensures that the internal components maintain their profile over long periods of service, even when operating at higher input speeds or under significant mechanical pressure.

Exceptional Stability and Repeatability

Precision is maintained through tight tolerances during the manufacturing process of every unit. The rigid housing, whether made from aluminium or grey cast iron, prevents deflection when the equipment is subjected to sudden torque spikes. This structural stiffness ensures that the gear mesh remains consistent, which directly translates to predictable output speeds and smooth mechanical transitions. Such stability is critical for applications where timing and positioning must be repeated thousands of times per hour without drifting from the intended operational parameters.

High Mechanical Efficiency

Optimizing energy consumption is a primary goal for modern industrial facilities, and this model supports that objective through efficient gear geometry. By minimizing internal losses within the worm gear speed reducer mechanism, more power is effectively transferred from the input to the output shaft. While efficiency naturally varies depending on the selected ratio and speed, the design focuses on maximizing the percentage of energy utilized for work rather than lost as heat. This helps reduce the total thermal load on your system and lowers overall operating costs.

Quiet and Smooth Operation

The smooth interaction between the worm and the wheel results in a machine that operates with minimal acoustic disturbance. Reducing vibration is not just about noise control; it is also about protecting the connected machinery from harmonic resonance that can lead to fatigue. The high-quality synthetic lubricants used in these units help dampen sound and provide a consistent film between moving parts. This leads to a much more pleasant working environment for operators and extends the life of bearings and seals throughout the entire system.

Versatile Configuration Options

Adaptability is a core strength of this series, allowing it to fit into diverse mechanical ecosystems. Users can choose from various mounting positions such as B3 or V5 to suit their specific installation geometry. The availability of different input bore diameters and IEC motor flange options means that the equipment can be matched to a vast array of standard motors without requiring expensive custom adapters. This flexibility simplifies the procurement process and allows for easier replacements when upgrading existing production lines or expanding capacity.

Industries Served by Worm Gear Reducer:

This equipment finds its primary utility across a wide spectrum of sectors, including food processing, packaging, and material handling. In environments where space is at a premium, the compact nature of an aluminium worm gearbox allows for dense machine layouts without sacrificing power density. For heavier industrial tasks such as lifting or large-scale mixing, the larger iron-bodied models provide the necessary mass and strength to manage significant loads. Matching the specific frame size and ratio to your application duty ensures that you achieve the required torque while maintaining the desired rotational speed for optimal productivity.

Worm Gear Reducer Operation Guide:

How to select, install and maintain a worm gear reducer.

Secure Mounting and Alignment

Begin by preparing a flat, stable mounting surface that matches the specified orientation of the equipment. Use high-grade fasteners to secure the housing to the base or machine frame according to the technical drawings. It is vital to ensure that the mounting surface is perfectly level to prevent any axial stress on the output shaft during operation. Proper alignment at this stage prevents premature bearing wear and reduces unnecessary vibration throughout the entire mechanical assembly.

Coupling Input and Output Shafts

Connect the motor to the input bore using the appropriate flange or coupling method specified for your model. When attaching the driven component to the output shaft, ensure that the connection is rigid and correctly centered. If you are using a custom worm gear reducer setup, double-check that all clearances are maintained. A precise coupling prevents misalignment, which is one of the leading causes of seal failure and internal gear damage in high-torque applications.

Initial Operation and Run-In

Once installed, perform a manual rotation check to ensure there is no unexpected resistance or binding. After connecting power, start the machine at a reduced speed if possible to allow the synthetic lubricant to distribute evenly across all gear teeth. During this initial run-in period, monitor the temperature of the housing closely. This phase allows any microscopic surface irregularities to settle, establishing a smooth contact pattern between the worm and the wheel for long-term reliability.

Continuous Performance Monitoring

During standard production cycles, regularly observe the output speed and torque levels to ensure they align with your calculated requirements. Listen for any changes in the acoustic signature of the machine, as unusual noises can indicate lubrication issues or component fatigue. Using thermal imaging or contact thermometers to check housing temperatures is also a highly effective way to detect potential overheating before it leads to a critical failure. Consistent monitoring helps in transitioning from reactive to proactive maintenance.

Routine Maintenance Procedures

Establish a scheduled maintenance program that includes checking oil levels and inspecting seals for any signs of leakage. Depending on the specific model, you may need to replace or top up the synthetic lubricant at set intervals to maintain optimal protection. Inspecting the input and output shafts for any signs of wear or deformation should also be part of your routine. Following these simple steps ensures that the equipment continues to operate at peak efficiency throughout its intended service life.

Quality Inspection Process:

1. Verify all incoming raw materials against the required metallurgical standards.
2. Perform precise dimensional checks on the housing and shaft diameters.
3. Conduct a thorough assembly check to ensure internal gear alignment.
4. Execute a load test to confirm torque and speed accuracy.
5. Complete a final pre-shipment inspection of all mounting surfaces.

Development Trends of Worm Gear Reducer:

The industry is seeing a significant shift toward higher efficiency standards and more integrated control systems. Manufacturers are increasingly focusing on advanced metallurgy and specialized coatings to extend component life while reducing friction. This evolution is driven by the global demand for energy-efficient production processes and sustainable manufacturing practices.

Furthermore, there is a growing trend toward modularity in gear design. As automation becomes more prevalent, the ability to quickly configure or replace speed reduction components with standardized interfaces is becoming essential. We expect to see more emphasis on smart monitoring capabilities that allow machines to communicate their health status directly to central control systems.

Our After-Sales Commitment:

Ever-Power is committed to supporting your operations long after the initial purchase. Our team provides comprehensive technical support to assist with installation and integration challenges. We guarantee a reply within 24 hours to any inquiry, ensuring your downtime is minimized. Additionally, we offer extensive drawings and customization support for unique projects, alongside a reliable supply of spare parts to maintain your equipment's performance.

Frequently Asked Questions (FAQ):

How do I choose the right model for my line?

Selecting the correct model depends on your required torque, speed, and available space. You should evaluate your motor’s output power and the load requirements of your driven equipment. Reviewing our technical data for frame sizes like EP-NMRV040 through EP-NMRV130 will help you match the center distance and torque capacity to your specific application needs.

What are the different housing options available?

We offer several housing configurations to suit various environments. Smaller models like the EP-NMRV040, EP-NMRV050, EP-NMRV063, and EP-NMRV075 feature an aluminium case and flanges for lightweight applications. For heavier duties, the EP-NMRV110 uses an iron body, while the EP-NMRV130 is constructed from grey cast iron G200 with a protective powder coating.

Can I use this with a standard IEC motor?

Yes, this equipment is designed for high compatibility. Many models are available as a worm gearbox with IEC motor flange options, such as 56B14 or 71B14. This allows you to connect the machine directly to standard industrial motors without needing additional adapters, simplifying your installation process significantly.

What is the gear ratio range for these units?

The EP-NMRV series offers a consistent and wide selection of ratios to provide precise speed control. For all models from the EP-NMRV040 up to the EP-NMRV130, the gear ratio range (i) is 7.5~100. This allows you to fine-tune the output speed and torque according to your specific mechanical requirements.

How much does a custom configuration cost?

Pricing for our equipment depends entirely on your specific configuration, including frame size, ratio, and material requirements. Because every industrial setup is unique, we do not provide flat rates. Please contact us to request a formal quotation based on the technical specifications of your intended application.

What materials are used for the internal gears?

To ensure durability, the worm shaft is made from 20CrMnTi that has been carburized and quenched. The worm wheel crown is crafted from ZCuSn10Pb1 tin bronze. This specific combination of steel and bronze is industry-standard for reducing wear and managing heat during continuous high-torque operation.

What input speeds can the machine handle?

The equipment is designed to work efficiently with standard motor speeds. For all models in this series, including the EP-NMRV040 through EP-NMRV130, the rated input speeds are 900 / 1400 / 2800 rpm. This compatibility ensures smooth operation across a variety of common electrical drive configurations.

Which lubricant should I use in the gearbox?

The type of lubricant depends on the frame size to ensure optimal protection. Smaller models like EP-NMRV040, EP-NMRV050, EP-NMRV063, and EP-NMRV075 use Synthetic ISO VG 320. Larger models such as EP-NMRV110 and EP-NMRV130 utilize Synthetic ISO VG 220 for better performance under higher thermal loads.

What are the available mounting positions?

We provide several mounting options to accommodate different machine layouts. All models in this series support various positions, including B3, B6, B7, B8, V5, and V6. This versatility allows engineers to integrate the equipment into vertical or horizontal orientations as required by their specific mechanical design.

How do I know if the torque capacity is sufficient?

You must compare your application’s peak load against our published output torque values. For example, at i=7.5 and n1=1400 rpm, an EP-NMRV075 provides 235 N·m, while an EP-NMRV130 provides 780 N·m. Always consult the full technical specification sheet to ensure your chosen model can handle your maximum required torque.

What is the weight of the larger models?

The weight varies significantly based on the frame size and housing material. For instance, the EP-NMRV040 weighs 2.3 kg, whereas the much larger EP-NMRV130 weighs 48 kg. Knowing these weights is essential for calculating the total load on your mounting structures and designing your machine’s support system correctly.

Is there support for custom input bore sizes?

Yes, we offer various input bore diameters to match different motor shafts. For example, the EP-NMRV040 offers Φ9(Φ11,Φ14) while the EP-NMRV130 provides Φ24(Φ28,Φ38). If your requirements fall outside these standard options, please contact us to discuss how we can provide a custom solution for your specific needs.

The EP-NMRV series represents a sophisticated balance of durability, efficiency, and versatile design for modern industrial needs. Whether you require a compact aluminium unit or a heavy-duty cast iron model, Ever-Power provides the engineering precision necessary to keep your operations running smoothly. We invite you to contact our technical team to discuss your specific requirements or to request detailed documentation. Our experts are ready to help you select the perfect configuration for your unique application and ensure your success.

Worm Gear Speed Reducers

Worm Gear Reducer Manufacturer & Factory Supplier