NRV Worm Gearbox with Input Shaft
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Technical Specifications
The NRV series is our standard worm gear reducer, featuring a shaft extension input structure for easy connection to various power sources via couplings or pulleys. As a fundamental core component for various transmission systems, this series is widely used in different industrial fields for its efficiency, stability, and durability.
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 designation.
To better understand our product models, here is a brief explanation of the NRV designation:
NRV Represents a worm gear reducer with an input shaft. This is a basic structure connected to the prime mover via a shaft extension, offering high versatility as a core unit for various transmission systems.
For example, the model NRV063 refers to a worm gear reducer with a center distance of 63 mm and a standard input shaft.
NRV Single Input Shaft Selection Guide
NRV is the standard shaft-input configuration in this product family. It is intended for layouts where the prime mover connects to one input-shaft extension through a suitable coupling, pulley, or other approved interface.
Where NRV Fits Best
- Machines that use a single external input-shaft connection.
- Replacement projects that must retain the existing shaft-input arrangement.
- Layouts where the motor or power source is mounted separately from the reducer.
When NRV May Not Be the Right Choice
Compare NRV-VS when the machine layout requires access to both ends of the worm input shaft. Compare NMRV when a compact motor-flange input arrangement is preferred. Do not finalize the model when the mounting pattern, shaft dimensions, or approved drawing cannot be matched.
NRV Model FAQ
What distinguishes NRV from NRV-VS?
NRV uses the standard single input-shaft arrangement, while NRV-VS uses a double-extension input shaft.
What should be measured for a replacement?
Confirm the frame size, ratio, input and output shaft dimensions, shaft center position, mounting-hole pattern, and available installation space.
Can NRV be connected to a separately mounted motor?
The shaft-input layout is intended for an external connection, but the coupling method, alignment, guarding, and support arrangement must be confirmed for the machine.
What information is required for model confirmation?
Provide the application, required ratio or output speed, motor speed and power, load condition, operating schedule, mounting position, and dimensional drawing or existing nameplate.
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 is the configuration to review when input access is required from one side. Verify the selected shaft end, keyway and coupling interface 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 both sides? Compare the NRV-VS 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 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.