PRV050 Worm Gear Unit | Right-Angle Worm Reducer Without Motor | Center Distance 50 mm
PRV050 | Industrial Worm Reducer Without Motor
The PRV050 worm gear unit provides the same precision and reliability as the NMRV family with complete motor flexibility, The PRV050 offers a maximum output torque of 84 Nm with input radial load capacity of 490 N, suited for belt conveyor drives, agitator systems, and general machinery in food, textile, and packaging sectors.
PRV series standalone worm gear unit | precision bronze worm wheel in a die-cast aluminium housing, ready for flexible motor coupling.
📈 Product Overview | PRV050 Worm Gear Unit
The PRV050 worm gear unit (also: standalone worm reducer, right-angle speed reducer, worm drive unit) is a motor-independent reducer providing maximum flexibility for OEM motor selection and custom coupling configurations.
Designed for center distance 50 mm and max torque 84 Nm, the PRV050 supports single (AS), double (AB), and hollow (F) output shaft configurations, double worm input shaft (VS), and multiple torque arm options.
Discover our manufacturing expertise and global supply capabilities.
📋 Technical Specifications
| Parameter | Value |
|---|---|
| Center Distance | 50 mm |
| Available Ratios (i) | 5-100 |
| Max Output Torque (M2) | 84 Nm |
| Max Output Radial Load Fr2 | 4,280 N |
| Max Input Radial Load Fr1 | 490 N |
| Output Shaft | 25 h6 |
| Input Shaft | 14 j6 |
| Housing Material | Die-Cast Aluminium EN AC-46000 |
| Worm Wheel Material | Phosphor Bronze CuSn10P |
| Lubrication | Synthetic ISO VG320 / Mineral VG320 |
| Protection Class | IP54 standard |
| Mounting Positions | B3, B6, B7, B8, V5 |
| Certifications | ISO 9001:2015, CE |
Precision-machined worm shaft (20CrMnTi, 58-62 HRC) and phosphor bronze worm wheel ensure quiet, efficient power transmission.
⚙️ Working Principle
The PRV050 converts motor rotation through 90| via the meshing of a hardened worm shaft and a bronze worm wheel. Ratio is set by the number of worm thread starts (Z1=1 to 4) and wheel teeth count. Single-start worms give the highest ratios and strongest self-locking; four-start worms give lower ratios with higher efficiency. Dynamic efficiency ranges from 0.44 to 0.90 depending on ratio and model. Separate oil-bath sump ensures continuous lubrication of all gear and bearing surfaces during operation.
⚡ Core Advantages
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Motor-Agnostic Input The PRV050 input shaft accepts any motor via coupling or PAM adapter | maximum OEM flexibility for global motor sourcing. |
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High Torque Density Bronze worm wheel and case-hardened worm deliver 84 Nm maximum torque in the compact 50 mm center-distance housing. |
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Quiet Operation Precision-ground worm geometry and phosphor bronze interaction produce smooth, low-noise transmission below 65 dB(A). |
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Self-Locking High-ratio worm geometry (|30:1) provides inherent self-locking, preventing back-drive without supplementary brakes. |
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Multiple Output Options Single shaft (AS), double shaft (AB), hollow bore (F), double worm input (VS) cover virtually every installation requirement. |
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Global Availability Stocked by authorised distributors in 80+ countries with fast lead times and comprehensive spare part availability. |
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Precision Bearings Pre-loaded deep-groove and tapered roller bearings on all shafts handle high combined loads with minimal heat generation. |
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Proven Track Record Over 20 years of global deployment in food, pharmaceutical, textile, and industrial automation confirms PRV reliability. |
Each PRV050 unit is produced in our ISO 9001:2015 certified facility with full dimensional inspection and run-in testing.
🏭 Structure & Material Craftsmanship
Housing: High-pressure die-cast EN AC-46000 aluminium with CNC-machined mating faces and ribbed exterior for passive cooling. Worm Shaft: 20CrMnTi, carburised and hardened 58-62 HRC, ground to DIN 7 accuracy, right-hand helix standard. Worm Wheel: Phosphor bronze CuSn10P centrifugal-cast rim, press-fitted and pinned to steel spider. Bearings: Deep-groove ball (worm shaft) and needle/tapered roller (wheel shaft), L10 > 20,000 h at rated load. Seals: Double-lip PTFE-coated shaft seals at all exits; oil-resistant O-ring on housing joints; breather plug for thermal equalisation.
🎯 Typical Application Scenarios
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General Industrial Conveyor systems, agitator drives, rotary indexers, and cam mechanisms all benefit from the PRV's reliable right-angle output. |
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Agricultural Machinery Augers, belt feeders, and gate actuators use the PRV for its weather-resistant housing and self-locking at high ratios. |
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Marine Deck Equipment Winches, mooring systems, and deck conveyors rely on the PRV for corrosion-resistant, robust speed reduction in salt environments. |
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Construction Equipment Concrete mixers, aggregate screen drives, and lifting mechanisms use PRV for high starting torque and reliable duty. |
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Renewable Energy Solar tracker single-axis and dual-axis drives exploit the PRV's self-locking to hold panel position during wind events. |
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Pharmaceutical & Food Clean-room and washdown-compatible installations in mixing, tableting, and conveying in regulated industries. |
🔎 Selection Guide
| Requirement | Recommendation |
|---|---|
| Match ratio to output speed | n2 = 1,400 / i. Use the PRV performance table (n1=1,400 rpm) to confirm M2 at your ratio exceeds application torque | service factor. |
| Verify radial load limits | Confirm output radial load Fr2 | 4,280 N at the shaft midpoint. Use the Frx formula for off-centre load positions. |
| Axial load considerations | Max allowable axial load = Fr2 / 5. Combined radial and axial loading must be checked against bearing capacity. |
| Hollow bore vs. solid shaft | Use hollow bore (suffix F) for shaft-mount installations to eliminate coupling alignment. Always fit the provided torque arm. |
| Motor selection and coupling | Choose motor frame and power matching your n1 and M1 requirements. Use a PAM adapter from the catalogue for direct IEC motor mounting to PRV050. |
| Lubrication for mounting position | Refer to the lubrication table for oil quantity per mounting position. Never overfill | excess oil causes foaming and leakage. |
🏆 Quality Certifications & Service Commitment
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ISO 9001:2015 Certified Manufacturing processes certified under international quality management standards, ensuring consistency across every unit. |
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CE Marked Full compliance with European Machinery Directive 2006/42/EC, enabling direct sale and use across EU member states. |
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Custom Engineering OEM/ODM: shaft dimensions, flange configs, mounting positions, and finishes tailored on request. |
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Global Logistics Partnerships with major freight forwarders ensure safe, on-time delivery to 80+ countries with full export documentation. |
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24-Month Warranty Every gearbox covered by a 24-month warranty against manufacturing defects, backed by responsive after-sales engineering support. |
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Technical Support Dedicated engineering team available for selection assistance, custom specifications, and field troubleshooting worldwide. |
❓ Frequently Asked Questions
Q: What is the difference between PRV050 and NMRV050?
A: The PRV050 has no motor flange | it is a standalone gear unit coupled to the motor via PAM adapter or custom bell housing. NMRV050 includes IEC B5/B14 flanges for direct motor mounting.
Q: Can I use a PAM adapter with the PRV series?
A: Yes. Standard PAM adapters for all PRV models enable coupling to IEC motors with the same ease as the NMRV series while retaining the standalone gearbox form factor.
Q: What lubrication is recommended?
A: Synthetic ISO VG320 gear oil (e.g., Shell Tivela SC320, Mobil Glygoyle 30) for best efficiency and extended service. Mineral VG320 is acceptable for standard-duty applications.
Q: How do I select the correct ratio?
A: Calculate n2 = n1 / i. Select the ratio placing n2 in your target range, then verify M2 in the PRV performance table (n1=1,400 rpm) exceeds your required output torque.
Q: Are hollow bore output versions available?
A: Yes | the PRV050F suffix denotes a hollow bore unit. A torque arm must be used to prevent housing rotation.
🌎 Case Studies | Engineer Field Notes
🇩🇪 Germany
Application: Automotive assembly conveyor systems
The NMRV series arrived precisely to spec. The aluminium die-cast housing is impressively rigid, and after 18 months of 3-shift operation we have had zero failures. Our procurement team now uses this supplier exclusively.
🇺🇸 United States
Application: Food-grade packaging line drives
Synthetic oil fill and the smooth surface finish made FDA audits straightforward. The gearboxes run quietly and maintain ratio accuracy even after 10,000 operating hours.
🇮🇳 India
Application: Textile spinning frame drives
We replaced three competitor brands with NMRV063 units and saw maintenance calls drop by over 60%. The torque arms for hollow-bore units were also well-engineered and simple to fit.
🇮🇹 Italy
Application: Bottling machine conveyor drives
IEC flanges aligned perfectly with our Siemens motor range. The broad ratio selection meant we could standardise on one gearbox family across our entire machine lineup | a huge inventory simplification.
🇧🇷 Brazil
Application: Agricultural irrigation pump drives
Despite harsh outdoor conditions | high humidity, dust, UV | the sealed aluminium housing and quality seals kept lubricant in and contamination out. Highly recommended for outdoor industrial duty.
🇦🇺 Australia
Application: Mining conveyor belt tensioning systems
The two-stage NMRV-NMRV units gave us the extreme reduction ratios we needed without resorting to expensive custom gearboxes. The technical support team helped with selection | very responsive.
📄 Related Products & Resources
- NMRV050 Series | Motor-integrated version with IEC flanges for direct motor mounting.
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