The RV50 worm gearbox is used in compact industrial drive systems where the motor must turn a machine at a lower speed through a right-angle output. It can be supplied as a reducer or matched with an electric motor as a complete geared motor assembly.
What is an RV50 worm gearbox?
RV50 refers to a size 50 worm gear reducer. Depending on the product naming system, buyers may also see NMRV050. The unit uses a worm shaft and worm wheel to reduce speed and increase usable output torque while changing the drive direction by 90 degrees.
The size designation identifies the product family, not a complete selection. Two RV50 units with different ratios or input flanges can have different operating characteristics. Always confirm the full model code and dimensional drawing.
Common RV50 reduction ratios
Common nominal ratios include:
| 7.5:1 | 10:1 | 15:1 | 20:1 | 25:1 | 30:1 |
|---|---|---|---|---|---|
| 40:1 | 50:1 | 60:1 | 80:1 | 100:1 | Confirm availability |
A higher nominal ratio produces a lower theoretical output speed. It does not automatically mean that the same frame can safely carry every load. Rated torque, efficiency and thermal performance vary with the selected ratio and operating point.
RV50 output-speed examples
| Motor rated speed | Nominal ratio | Theoretical output speed |
|---|---|---|
| 1400 rpm | 10:1 | 140 rpm |
| 1400 rpm | 20:1 | 70 rpm |
| 1400 rpm | 30:1 | 46.7 rpm |
| 1400 rpm | 40:1 | 35 rpm |
| 1400 rpm | 50:1 | 28 rpm |
These are theoretical examples. Use the motor's actual rated rpm rather than synchronous speed. Induction-motor slip and operating load can change actual speed.
For your own operating point, use the worm gearbox ratio, speed and torque calculator.
RV50 features and configuration checks
- Compact right-angle layout
- Aluminum-alloy housing
- Multiple nominal ratios
- Hollow output and optional shaft or flange arrangements, subject to configuration
- IEC motor-ready input options, subject to frame and flange confirmation
- Smooth, relatively quiet operation when correctly installed and loaded
- Multiple mounting positions for machinery layouts
Typical RV50 applications
RV50 gearboxes are considered for conveyor systems, packaging machinery, food-processing equipment, agricultural machinery, mixers, material handling and general automation. Suitability depends on real torque, duty and environmental requirements.
| Application | Important selection check |
|---|---|
| Conveyor | Starting torque, load variation and starts per hour |
| Packaging machine | Cycle frequency, positioning and mounting space |
| Food equipment | Cleaning exposure, temperature and enclosure needs |
| Agricultural machinery | Dust, shock load, ambient conditions and duty |
| Mixer | Peak torque, continuous duty and thermal capacity |
How to select an RV50 gearbox
- Calculate the required ratio. Divide motor rated speed by required machine output speed.
- Determine design torque. Multiply required machine torque by the application service factor.
- Verify the RV50 rating. Compare design torque with the manufacturer's rating at the selected ratio and input speed.
- Check thermal duty. Consider operating hours, ambient temperature, ventilation, starts and nearby heat sources.
- Confirm interfaces. Verify IEC motor frame, flange, pilot, input shaft, output bore or shaft, keyway and mounting orientation.
- Review safety. Do not rely on assumed self-locking for lifting or personnel-safety applications; use an engineered brake or holding device where required.
RV50 quotation checklist
- Machine and application
- Motor power, rated rpm, voltage and frequency
- Required output speed or ratio
- Continuous, starting and peak torque
- Operating hours, starts per hour and reversing
- Mounting position and shaft orientation
- Output bore, shaft or flange requirements
- Ambient temperature, dust, moisture or washdown exposure
- Quantity and delivery destination
Final availability and delivery time depend on ratio, motor, mounting configuration, quantity and stock confirmation.
Frequently asked questions
What ratios are commonly available for RV50?
Common nominal ratios include 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80 and 100. Confirm the selected configuration before ordering.
What is the output speed at 30:1?
With a 1400 rpm rated motor, theoretical output speed is approximately 46.7 rpm.
Can RV50 be supplied with a motor?
Yes. Confirm motor power, speed, IEC frame, flange, voltage, frequency and duty together with the reducer.
Is RV50 suitable for continuous duty?
It may be when mechanical and thermal ratings meet the application. Verify load, ratio, ambient conditions, lubrication and operating hours.
Request RV50 model confirmation
SMK Transmission supplies RV50/NMRV050 worm gearboxes with different ratios, motor interfaces and mounting options. Review the NMRV worm gearbox product range, compare RV25 to RV150 frame sizes, or send application data for an RV50 quotation.