Reducer

Focusing on the design, manufacturing processes, heat treatment techniques, and key quality control points for all types of standard and non-standard gears.

NMRV gearbox

Standard worm gear reducers (based on the internationally common NMRV/RV series) are right-angle, crossed-axis transmission units. They utilize a worm to drive a tin-bronze worm gear to achieve high reduction ratios; combining a compact structure with cost-effectiveness, they are widely used in light-duty conveying, packaging machinery, and automated assembly lines.

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Product Description

High Reduction Ratios & Compact Footprint: Single-stage ratios range from 7.5:1 to 100:1. With input and output shafts oriented at a 90° right angle, it dramatically reduces horizontal installation footprint compared to parallel-shaft gearboxes of equivalent power.
Low Vibration & Quiet Operation: Continuous helical sliding tooth engagement ensures significantly lower operating noise than standard spur gears, delivering smooth motion control and superior shock absorption.
Static Self-Locking Capability: At higher reduction ratios (typically single-stage ratios $i \ge 40$ ) with a small lead angle, the unit provides static self-locking to prevent back-driving or load slip, serving as an added safety margin.
Rugged, Lightweight Housing: Smaller frame sizes (025–090) utilize die-cast aluminum alloy for optimal heat dissipation and lightweight handling; larger frames (110–150) feature high-tensile cast iron housings to withstand heavy-duty shock loads.

Internal Construction & Materials

Worm Shaft: Made of forged alloy steel (20Cr / 20CrMnTi), carburized, quenched, and precision profile-ground. Surface hardness reaches HRC 56–62 to ensure maximum wear resistance and bending fatigue strength.
Worm Wheel: Cast with premium wear-resistant tin bronze (ZCuSn10Pb1 / CuSn12) on a ductile iron core, minimizing friction coefficients and preventing scuffing under continuous sliding contact.
Bearings & Seals: Fitted with precision deep-groove ball bearings and heavy-duty tapered roller bearings. Critical shaft journals feature dual-lip NBR skeleton oil seals (or high-temperature FKM/Viton seals) to completely eliminate oil seepage.

Typical Applications & Mounting Configurations

Target Industries:
- Logistics & conveying systems (belt conveyors, roller tracks, chain bucket elevators)
- Food & beverage packaging (shrink wrappers, automated fillers, capping and labeling machines)
- Factory automation, woodworking CNC equipment, and textile finishing lines
- Actuators, stage rigging systems, and wastewater treatment agitators/clarifiers
Mounting Flexibility:
- Hollow output shaft with keyway, single/double solid output shafts
- Side output flanges (short/long flange patterns) or torque arm mounting
- Full universal 360° mounting orientation compatibility (B3, B8, V5, V6, etc.)

Parameter Information

Parameter	Value
Series	NMRV (Bore Input with Input Flange)
Centre Distance	25 mm
Frame Sizes	NMRV 025 / 030 / 040 / 050 / 063 / 075 / 090 / 110 / 130 / 150
Input Power Rating	0.06 kW to 15 kW (Compatible with standard IEC B5 / B14 motor flanges)
Reduction Ratios	5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100
Rated Input Power	Up to 0.06 kW
Output Speed Range	14 to 280 r/min (at 1400 r/min input)
Max Output Torque	1,006 N·m
Housing Material	Die-cast aluminium alloy (corrosion-resistant)
Worm Wheel Material	Phosphor bronze
Worm Shaft Material	20CrMnTi alloy steel, case hardened, ground
IEC Input Flanges	56B5, 56B14
Mounting Positions	B3, B6, B7, B8, V5, V6
Lubrication	Oil bath / grease, dual-lip oil seal
Protection Class	IP54
Ambient Temperature	-10°C to +40°C

Our Core Strengths

Standardized Production Process Flow

Raw Material Forging & Normalizing
Premium alloy steel (20CrMnTi / 40Cr) forgings undergo strict normalizing and ultrasonic flaw detection to eliminate internal stress, optimize grain structure, and ensure superior core impact resistance.

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Precision CNC Machining & Gear Hobbing
Multi-axis CNC lathes complete high-precision turning of reference datums and end faces. High-speed CNC gear hobbing and shaping machines precisely form the initial tooth profile with strict geometric allowances.
Controlled Carburizing & Heat Treatment
Processed in multi-purpose atmosphere-controlled furnace lines. Surface carburizing and quenching achieve a wear-resistant surface hardness of HRC 58–62, while preserving tough, shock-absorbing cores.

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High-Precision CNC Gear Grinding
Advanced CNC profile gear grinding machines eliminate heat-treatment micro-distortions. Tooth flanks are precisely modified with crowning to achieve DIN Class 5–6 accuracy, ensuring whisper-quiet running.
Housing Machining & Clean Modular Assembly
Gearbox housings are machined on CNC horizontal machining centers for micron-level bore concentricity. Assembled in a clean workshop with top-tier bearings (SKF/NSK/C&U) and dual-lip oil seals to guarantee zero oil leakage.

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100% Comprehensive Testing & Export Packaging
Every unit undergoes 100% full inspection: gear measurement center (CMM), dynamic running test (vibration, noise, temperature rise) and sealing test before multi-layer anti-rust film and solid plywood case packaging.

Core Advantage

Ultra-Silent Transmission

High-precision gear grinding delivers tooth surface roughness as low as Ra 0.4, with tight meshing, low vibration and noise for smoother equipment operation.

Extended Service Life

Premium materials matched with precise heat treatment ensure wear-resistant tooth surfaces and impact-resistant core, cutting maintenance and replacement costs.

All-Condition Adaptation

Custom solutions for high-speed heavy load, corrosion resistance and food-grade scenarios, eliminating trial-and-error costs in product selection.

Cost-Effective & Reliable Delivery

Scaled production supports tiered pricing for bulk orders with consistent quality; full-process control guarantees stable lead time and complete after-sales support.

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Logistics and After-Sales Service

Global Logistics & Export Packaging

VCI Anti-Rust & Solid Plywood Packaging

Internal VCI vacuum anti-rust packaging combined with seaworthy, non-fumigation plywood crates to guarantee zero corrosion during long ocean transit.

Flexible Multi-Modal Shipping

Supporting Sea Freight, Air Cargo, and Railway Express (FOB, CIF, DDP/DDU) with real-time tracking for punctual delivery.

Complete Export Documentation

Full clearance support including Certificate of Origin (CO/Form E), CE certificates, and factory dynamic test reports.

After-Sales Service & Technical Warranty

12-Month Full Quality Warranty

100% free replacement or repair for any manufacturing-related defects under standard operating conditions within 12 months.

24/7 Rapid Engineering Support

Professional technical team provides 2-hour response for model selection, installation guidance, and troubleshooting.

Lifetime Spare Parts Availability

Sufficient inventory of standardized modular parts (gears, shafts, seals, bearings) ensuring rapid worldwide dispatch.

Frequently Asked Questions (FAQ)

Can your gearboxes directly replace international brands like SEW, Flender, or Bonfiglioli?

Yes. Our modular gearboxes (R, F, K, S series and planetary units) are designed to standard international mounting dimensions. They can achieve 1:1 direct interchangeability in mounting hole positions, shaft diameters, input flanges, and gear ratios without modifying your existing machinery.

What technical parameters do I need to provide to select the right gearbox?

To help our engineering team calculate the ideal model, please provide: input motor power (kW/HP), input/output speed (RPM) or gear ratio, required output torque (Nm), mounting position (horizontal/vertical), and the specific application or working environment.

What is the typical lead time for standard and customized gearboxes?

For standard modular models (R/F/K/S series and cycloidal gearboxes), lead time is typically 7–15 days. For customized units with special ratios, shafts, or special flanges, lead time is usually 20–30 days. Emergency spare parts are dispatched within 48 hours.

How do you guarantee zero oil leakage and transmission durability?

All gearboxes utilize precision-machined CNC housings for micro-level bore concentricity, premium dual-lip skeleton oil seals, and top-tier bearings (SKF/NSK/C&U). Every unit undergoes a 100% dynamic running test (vibration, noise, temperature rise) and sealing test before export packing.

What is your MOQ, warranty policy, and do you supply test reports?

Our MOQ is 1 unit (sample order supported). All products come with a 12-month comprehensive warranty. Each shipment can be provided with full documentation, including dynamic test records, material certificates, CMM gear inspection reports, and CE/ISO compliance certificates.