NRV-VS Worm Gearbox with Input Shaft
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Technical Specifications
The NRV-VS series reducer is specifically designed for applications requiring a double input shaft. Manufactured with high-quality materials and advanced processes, it features a compact structure, smooth transmission, low noise, and high load capacity. We are committed to providing you with efficient and reliable transmission solutions.
Based on shaft extension input, input speed 1400 r/min.
Performance Parameters
| Model | Input Power (kW) | Output Speed (r/min) | Output Torque (N·m) | Ratio |
|---|---|---|---|---|
| NRV30 | 0.4 | 186.7 | 18 | 7.5 |
| NRV40 | 0.9 | 186.7 | 40 | 7.5 |
| NRV50 | 1.6 | 186.7 | 71 | 7.5 |
| NRV63 | 2.8 | 186.7 | 128 | 7.5 |
| NRV75 | 4.1 | 186.7 | 185 | 7.5 |
| NRV90 | 6.3 | 186.7 | 290 | 7.5 |
| NRV110 | 12 | 186.7 | 552 | 7.5 |
| NRV130 | 16.1 | 186.7 | 750 | 7.5 |
| NRV150 | 25.8 | 186.7 | 1200 | 7.5 |
* This is a partial list. For complete parameters, please refer to the product catalog or contact us.
Installation & Maintenance
Key points to ensure reliable operation and service life.
Installation Points
- The reducer must be installed on a flat, solid base with tight, anti-vibration anchor bolts.
- Shafts of the prime mover, reducer, and working machine must be accurately aligned after installation.
- When mounting sprockets or gears, position them as close to the bearings as possible to reduce bending stress.
- If the motor is oversized, a support structure should be provided.
Usage Notes
- Before use, check all specifications. The worm input speed should not exceed 1500 r/min.
- Apply load gradually upon startup; do not start at full load.
- The maximum allowable oil temperature is 95°C. Stop and inspect if this is exceeded.
- If the reducer has been stored for more than 4–6 months, it’s recommended to replace the oil seals.
Lubrication & Maintenance
- Models 25–90: Shipped with ISO VG320 synthetic oil, no need to add. Change oil after the first 5000 hours, then every 6000 hours.
- Models 110–150: Shipped with ISO VG460 mineral oil. Change oil after the first 400 hours, then every 4000 hours.
Model Explanation
Quick guide to understanding the NRV-VS designation.
To better understand our product models, here is a brief explanation of the NRV-VS designation:
NRV Represents a worm gear reducer with an input shaft for connection. This is a basic structural form connected to the prime mover via a shaft extension.
VS Indicates that the reducer is equipped with a double extension worm shaft. This design allows power input from both ends of the worm, providing greater flexibility in machine design.
For example, the model NRV063-VS denotes a worm gear reducer with a center distance of 63 mm, equipped with a double input shaft.
NRV-VS Double Input Shaft Selection Guide
NRV-VS is the double-extension input-shaft configuration in the NRV family. It is intended for machine layouts that need the worm input shaft to remain accessible from both sides.
Where NRV-VS Fits Best
- Layouts requiring connection access from either side of the reducer.
- Machines that must preserve an existing double-ended input-shaft arrangement.
- Equipment designs where the input-side position may vary between installations.
When NRV-VS May Not Be the Right Choice
Use the simpler NRV single-input model when only one input-shaft extension is required. Compare NMRV-VS when the required frame and interface belong to the compact NMRV family. Do not select NRV-VS until unused shaft extensions can be safely guarded and the dimensional drawing has been checked.
NRV-VS Model FAQ
What does VS identify on this model?
VS identifies the double-extension worm input shaft described for this configuration.
Does NRV-VS have the same installation checks as NRV?
The ratio, mounting pattern, shaft centers, and output interface still require confirmation, with the additional need to check clearance and guarding on both input-shaft ends.
When is the standard NRV model more suitable?
NRV is generally the clearer choice when the machine only requires one external input-shaft connection.
What should be supplied for a replacement enquiry?
Send the existing nameplate, overall and interface dimensions, required ratio, input arrangement, mounting position, operating schedule, and application details.
Final selection and installation interfaces must be confirmed against the approved manufacturer drawing.
NRV and NRV-VS Input Shaft Access Guide
Current model focus: NRV-VS is the configuration to review when input access is required from both sides. Verify both shaft extensions and surrounding clearance on the approved drawing.
NRV: single-ended input access
Use the project drawing to confirm which side must remain accessible for the motor or coupling.
NRV-VS: double-extension input access
Confirm clearance, guarding and the intended connection on each side before ordering.
Need access from one side? Compare the NRV worm gearbox.
Project data to verify before selection
- Operating requirement: input speed, required output speed or ratio, duty cycle and driven load.
- Mechanical interface: mounting position, shaft direction, center height, shaft dimensions, keyway and available clearance.
- Site conditions: ambient environment, access for guarding and maintenance, and the installation arrangement.
Final verification: use the approved ZPGear or manufacturer drawing and the project specification as the source of truth. Ask ZPGear to confirm the selection when load or installation data is uncertain.
Engineering Data and Selection Verification
Use the information on this NRV-VS Worm Gearbox with Input Shaft page for preliminary comparison. Final dimensions, materials, interfaces and operating limits must be confirmed against the current manufacturer catalog or an approved project drawing before purchase, fabrication or installation.
Table scope: each parameter row applies only to the model or size identified in that row. Do not interpolate, combine or transfer values between sizes without manufacturer confirmation.
Required Project Inputs
- Input speed and motor information
- Required output speed or target ratio
- Driven load type, start-stop pattern and operating schedule
- Mounting position, shaft direction and available installation space
- Site environment and maintenance-access requirements
Interfaces to Confirm
- Model size and mounting-hole pattern
- Input and output shaft or bore dimensions
- Flange, keyway, coupling and guarding arrangement
- Shaft center position and surrounding clearance
- Lubrication and inspection access
Reproducible Speed and Ratio Check
Required ratio: input speed ÷ target output speed. Expected output speed: input speed ÷ selected ratio. Record the source of each input value and use consistent units.
This arithmetic check does not confirm torque, power, service factor, temperature, efficiency or life. Ask ZPGear to verify those items from the current manufacturer data for the selected model and operating condition.
Source record: keep the manufacturer name, catalog or drawing number, revision date, selected model size, project inputs and final approval sheet with the order documentation. Send the project information to ZPGear for confirmation.