PRV040+PMRV090 Two-Stage Worm Gear Unit | Combined Reducer Without Motor | Ratio 300-5000:1
PRV040+PMRV090 | PRV+PMRV Combined Worm Gear Unit | Motor-Free Two-Stage Reducer
The PRV040+PMRV090 combined worm gear unit integrates the PRV040 standalone worm reducer as first stage with the PMRV090 worm output stage in a factory-assembled two-stage configuration. Produces up to 610 Nm with a radial output load capacity of 8,180 N | combining two worm stages in a standalone housing for high-reduction, high-torque industrial drive applications.
The PRV040+PMRV090 PRV+PMRV combined reducer | ultra-high ratio two-stage worm drive with flexible motor coupling for OEM applications.
📈 Product Overview | PRV040+PMRV090
The PRV040+PMRV090 combined worm gear unit (also: PRV-PMRV combined reducer, motor-free two-stage worm gearbox) provides combined ratios from 300-5000:1 and output torques up to 610 Nm with complete motor independence.
Unlike the PMRV-PMRV series, the PRV040 first stage accepts any motor via flexible coupling, giving machine builders complete freedom to select motor brands and frame sizes without being constrained to IEC flange options.
Learn more about our product portfolio and global capabilities.
📋 Technical Specifications
| Parameter | Value |
|---|---|
| Combined Ratio Range (i) | 300-5000 |
| Max Output Torque (M2) | 610 Nm |
| Max Radial Load Fr2 | 8,180 N |
| First Stage | PRV040 | standalone worm gear unit |
| Second Stage | PMRV090 | worm geared motor |
| Housing Material | Die-Cast Aluminium |
| Input Configuration | Flexible coupling to any IEC motor |
| Certifications | ISO 9001:2015, CE |
Two independently precision-manufactured worm stages are factory-aligned and tested as a single unit for consistent quality.
⚙️ Working Principle
The PRV040+PMRV090 operates as a cascade of two worm stages. Motor input drives the worm shaft of the PRV040 first stage, producing intermediate speed at the first-stage output. This intermediate shaft connects to the input worm of the PMRV090 second stage, further reducing speed and multiplying torque. Total ratio: i_total = i_PRV | i_PMRV. Both stages independently self-lock. The motor-agnostic input of the PRV first stage enables coupling to any drive source.
⚡ Core Advantages
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Motor-Agnostic Input The PRV040 input accepts any motor via standard coupling | maximum OEM flexibility for global motor sourcing and custom drive configurations. |
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Ultra-High Combined Ratios Ratios from 300-5000:1 enable the slowest output speeds required in solar tracking, valve actuation, and precision positioning. |
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Dual Self-Locking Stages Both worm stages self-lock independently | exceptional load holding under static conditions without electrical or mechanical brakes. |
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Factory-Aligned Assembly Both stages aligned, assembled, and tested as a unit in our facility | no field alignment required. |
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Independent Stage Maintenance Each stage has its own oil fill/drain access points | independent oil changes without full unit disassembly. |
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Standard PRV Dimensions The PRV040 input and PMRV090 output interfaces are identical to standalone PRV/PMRV units | compatible with existing fixturing and coupling designs. |
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Proven Industrial Deployment PRV-PMRV combined units are deployed in water treatment, solar farms, and industrial automation across 80+ countries. |
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Cost-Efficient High Ratio Combining two standard worm stages is more cost-effective than custom high-ratio single-stage solutions with equivalent ratio output. |
Each PRV040+PMRV090 unit undergoes load testing and dimensional inspection at our ISO 9001:2015 certified facility.
🏭 Structure & Material Craftsmanship
First Stage (PRV040): Full PRV standalone worm gear unit | die-cast aluminium housing, phosphor bronze worm wheel, 20CrMnTi case-hardened worm shaft. Input shaft accepts coupling, sprocket, or motor via PAM adapter. Second Stage (PMRV090): Full PMRV worm geared motor body. Input (worm shaft) is driven from first-stage output via precision coupling adapter | concentricity within 0.02 mm TIR. Factory Assembly: Assembled on precision fixture; axial and radial alignment confirmed by CMM measurement; run-in and load-tested before dispatch.
🎯 Typical Application Scenarios
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Solar Panel Tracking Single- and dual-axis solar tracker drives exploit the extreme self-locking ratios for maintenance-free panel positioning. |
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Industrial Valve Actuators Large gate, ball, and butterfly valve actuators use the enormous mechanical advantage for reliable, safe valve operation. |
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Water & Wastewater Treatment Sludge scrapers, belt filter presses, and rotating biological contactors operate at ultra-slow speeds achievable only with multi-stage reduction. |
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Heavy Industrial Positioning Large workpiece positioners, crane slewing rings, and assembly turntables use the unit for precise slow-speed positioning under heavy loads. |
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Amusement & Entertainment Slowly rotating scenic elements, Ferris wheel drives, and stage platforms use the self-locking for safe, controlled slow rotation. |
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Scientific Instruments Telescope mounts, goniometers, and precision calibration rigs use ultra-high ratio units for sub-arcminute angular positioning. |
🔎 Selection Guide
| Requirement | Recommendation |
|---|---|
| Calculate required ratio | i_total = n1_motor / n2_output. Use PRV-PMRV parameter table to find i? and i? combinations. PRV040+PMRV090 supports 300-5000:1. |
| Verify output torque sufficiency | Confirm M2 in the performance table exceeds your required torque | service factor. Max available M2: 610 Nm. |
| Check radial load on output shaft | Application output shaft radial load must not exceed 8,180 N at the shaft midpoint. |
| Motor coupling selection | Choose a jaw coupling, flange coupling, or PAM adapter for the PRV040 input shaft matching your motor output shaft diameter and rated torque. |
| Mounting position and oil fill | Fill each stage with the oil quantity specified in the lubrication table for your chosen mounting position. |
| Service factor and duty cycle | Apply the service factor chart and verify that the selected unit's M2 | f.s. | catalogue M2 at the chosen ratio. |
🏆 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: How does PRV040+PMRV090 differ from PMRV equivalent?
A: The PRV040 input accepts any motor via flexible coupling, giving OEM machine builders complete freedom to select motor brands and frame sizes without being constrained to IEC flange options.
Q: What is the motor coupling method?
A: The PRV040 input shaft is coupled to the motor via standard coupling (jaw, flange, or PAM adapter). Both stages are factory-assembled and tested as a unit.
Q: Are mounting positions the same as PMRV-PMRV?
A: Yes. The PRV-PMRV combination supports the same range of mounting positions with appropriate oil fill quantities per position.
Q: Can I use a PAM adapter for standard IEC motors?
A: Yes. Standard PAM adapters for the PRV040 input enable coupling to IEC motors in B5 or B14 configuration | same ease of motor mounting as the PMRV series.
Q: What is the maximum input power?
A: Depends on the first-stage PRV040 model and selected sub-ratio. Refer to the PRV performance tables at n1=1,400 rpm for specific P1 values at each ratio.
🌎 Case Studies | Engineer Field Notes
🇩🇪 Germany
Application: Automotive assembly conveyor systems
The PMRV 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 PMRV063 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 PMRV-PMRV 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
- PMRV-PMRV Series | Motor-integrated two-stage worm gearbox with IEC flanges.
- PC-PMRV Series | Helical pre-stage plus PMRV for better efficiency at high ratios.
- PRV040 Standalone | Single PRV stage for ratios up to 100:1 without motor.
Contact us for engineering support and custom OEM solutions.
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Join thousands of engineers and procurement professionals worldwide who trust our worm gearbox solutions. Our technical team is ready to help you select the right model, customise specifications, and ensure on-time delivery.
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