Product Description
RV Series Worm Gear Boxes Gearbox Speed Reducer with Electric Motors
Input Configurations | Double or single input shaft (NRV) |
Round Input Flange for IEC B5/B14 motor (NMRV) | |
| Square Input Flange for Servo Motor (NMRV) | |
Output Configurations
| Double Output Shaft (AB) or Single Output Shaft (AS) |
Output flange |
Specification
Model | Motor Input Flange (circle) | Transmission Ratio | Power (kw) | Ratio (i) | Nominal Torque (Nm) | |||||||||||||||
PAM / IEC | Internal Dia. | Dis. Between Diagonal Screw Holes | External Dia. | Width of Key Slot | 5 | 7.5 | 10 | 15 | 20 | 25 | 30 | 40 | 50 | 60 | 80 | 100 | ||||
N | M | P | E | Diamter of Input Shaft | ||||||||||||||||
NMRV25 | 56B14 | 50 | 65 | 80 | 3 | 9 | – | 9 | – | 0.06 | 7.5-60 | 2.6-14 | ||||||||
NMRV30 | 63B5 | 95 | 115 | 140 | 4 | 11 | – | 0.06-0.18 | 7.5-80 | 2.6-14 | ||||||||||
63B14 | 60 | 75 | 90 | |||||||||||||||||
56B5 | 80 | 100 | 120 | 3 | 9 | – | ||||||||||||||
56B14 | 50 | 65 | 80 | |||||||||||||||||
NMRV40 | 71B5 | 110 | 130 | 160 | 5 | 14 | – | 0.09-0.37 | 7.5-100 | 11-53 | ||||||||||
71B14 | 70 | 85 | 105 | |||||||||||||||||
63B5 | 95 | 115 | 140 | 4 | 11 | |||||||||||||||
63B14 | 60 | 75 | 90 | |||||||||||||||||
56B5 | 80 | 100 | 120 | 3 | – | 9 | ||||||||||||||
NMRV50 | 80B5 | 130 | 165 | 200 | 6 | 19 | – | 0.12-0.75 | 7.5-100 | 21-89 | ||||||||||
80B14 | 80 | 100 | 120 | |||||||||||||||||
71B5 | 110 | 130 | 160 | 5 | 14 | – | ||||||||||||||
71B14 | 70 | 85 | 105 | |||||||||||||||||
63B5 | 95 | 115 | 140 | 4 | – | 11 | ||||||||||||||
NMRV63 | 90B5 | 130 | 165 | 200 | 8 | 24 | – | 0.25-1.5 | 7.5-100 | 56-166 | ||||||||||
90B14 | 95 | 115 | 140 | |||||||||||||||||
80B5 | 130 | 165 | 200 | 6 | 19 | – | ||||||||||||||
80B14 | 80 | 100 | 120 | |||||||||||||||||
71B5 | 110 | 130 | 160 | 5 | – | 14 | ||||||||||||||
71B14 | 70 | 85 | 105 | |||||||||||||||||
NMRV75 | 100/112B5 | 180 | 215 | 250 | 8 | – | 28 | – | 0.55-4 | 7.5-100 | 90-269 | |||||||||
100/112B14 | 110 | 130 | 160 | |||||||||||||||||
90B5 | 130 | 165 | 200 | 8 | 24 | – | ||||||||||||||
90B14 | 95 | 115 | 140 | |||||||||||||||||
80B5 | 130 | 165 | 200 | 6 | – | 19 | ||||||||||||||
80B14 | 80 | 100 | 120 | |||||||||||||||||
71B5 | 110 | 130 | 160 | – | – | 14 | ||||||||||||||
NMRV90 | 100/112B5 | 180 | 215 | 250 | 8 | – | 28 | – | 0.55-4 | 7.5-100 | 101-458 | |||||||||
100/112B14 | 110 | 130 | 160 | |||||||||||||||||
90B5 | 130 | 165 | 200 | 8 | 24 | – | ||||||||||||||
90B14 | 95 | 115 | 140 | |||||||||||||||||
80B5 | 130 | 165 | 200 | 6 | – | 19 | ||||||||||||||
80B14 | 80 | 100 | 120 | |||||||||||||||||
NMRV110 | 132B5 | 230 | 265 | 300 | 10 | – | 38 | – | 1.1-7.5 | 7.5-100 | 242-660 | |||||||||
132B14 | 130 | 165 | 200 | – | ||||||||||||||||
100/112B5 | 180 | 215 | 250 | 8 | 28 | – | ||||||||||||||
90B5 | 130 | 165 | 200 | – | 24 | |||||||||||||||
90B14 | 95 | 115 | 140 | – | ||||||||||||||||
80B5 | 130 | 165 | 200 | – | 19 | |||||||||||||||
NMRV130 | 132B5 | 230 | 265 | 300 | 10 | – | 38 | – | 2.2-7.5 | 7.5-100 | 333-1596 | |||||||||
132B14 | 130 | 165 | 200 | – | ||||||||||||||||
100/112B5 | 180 | 215 | 250 | 8 | – | 28 | ||||||||||||||
90B5 | 130 | 165 | 200 | – | – | 24 | ||||||||||||||
90B14 | 95 | 115 | 140 | |||||||||||||||||
NMRV150 | 160B5 | 250 | 300 | 350 | 12 | – | 42 | – | 2.2-15 | 7.5-100 | 570-1760 | |||||||||
132B5 | 230 | 265 | 300 | 10 | – | 38 | – | |||||||||||||
132B14 | 130 | 165 | 200 | – | ||||||||||||||||
100/112B5 | 180 | 215 | 250 | 8 | – | 28 | ||||||||||||||
Company profile
Scenario
Packing
FAQ
Q1: I want to buy your products, how can I pay?
A: You can pay via T/T(30%+70%), L/C ,D/P etc.
Q2: How can you guarantee the quality?
A: One year’s warranty against B/L date. If you meet with quality problem, please send us pictures or video to check, we promise to send spare parts or new products to replace. Our guarantee not include inappropriate operation or wrong specification selection.
Q3: How we select models and specifications?
A: You can email us the series code (for example: RC series helical gearbox) as well as requirement details, such as motor power,output speed or ratio, service factor or your application…as much data as possible. If you can supply some pictures or drawings,it is nice.
Q4: If we don’t find what we want on your website, what should we do?
A: We offer 3 options:
1, You can email us the pictures, drawings or descriptions details. We will try to design your products on the basis of our
standard models.
2, Our R&D department is professional for OEM/ODM products by drawing/samples, you can send us samples, we do customized design for your bulk purchasing.
3, We can develop new products if they have good market. We have already developed many items for special using successful, such as special gearbox for agitator, cement conveyor, shoes machines and so on.
Q5: Can we buy 1 pc of each item for quality testing?
A: Yes, we are glad to accept trial order for quality testing.
Q6: How about your product delivery time?
A: Normally for 20’container, it takes 25-30 workdays for RV series worm gearbox, 35-40 workdays for helical gearmotors.
| Application: | Motor, Machinery, Agricultural Machinery, Material Handling Machines |
|---|---|
| Hardness: | Hardened Tooth Surface |
| Installation: | B3, B6, B7, B8, V5, V6 |
| Step: | Single-Step |
| Type: | Worm Reducer |
| Rated Power: | 3.0 Kw |
| Customization: | Available | Customized Request |
|---|

Is it Possible to Reverse the Direction of a Worm Gearbox?
Yes, it is possible to reverse the direction of a worm gearbox by changing the orientation of either the input or output shaft. However, reversing the direction of a worm gearbox can have some implications that need to be considered:
- Efficiency: Reversing the direction of a worm gearbox can potentially affect its efficiency. Worm gearboxes are typically more efficient in one direction of rotation due to the design of the worm and worm wheel.
- Backlash: Reversing the direction of rotation might lead to increased backlash or play in the gearbox, which can impact precision and smooth operation.
- Lubrication: Depending on the gearbox’s design, reversing the direction could affect lubrication distribution and lead to uneven wear on the gear teeth.
- Load: Reversing the direction might also impact the gearbox’s load-carrying capacity, especially if it’s designed for predominantly one-way operation.
- Noise and Vibration: Direction reversal can sometimes result in increased noise and vibration due to changes in gear engagement and meshing behavior.
If you need to reverse the direction of a worm gearbox, it’s advisable to consult the gearbox manufacturer’s guidelines and recommendations. They can provide insights into whether the specific gearbox model is suitable for reversible operation and any precautions or adjustments needed to ensure proper functioning.

Worm Gearbox vs. Helical Gearbox: A Comparison
Worm gearboxes and helical gearboxes are two popular types of gear systems, each with its own set of advantages and disadvantages. Let’s compare them:
| Aspect | Worm Gearbox | Helical Gearbox |
| Efficiency | Lower efficiency due to sliding friction between the worm and worm wheel. | Higher efficiency due to rolling contact between helical gear teeth. |
| Torque Transmission | Excellent torque transmission and high reduction ratios achievable in a single stage. | Good torque transmission, but may require multiple stages for high reduction ratios. |
| Noise and Vibration | Generally higher noise and vibration levels due to sliding action. | Lower noise and vibration levels due to smoother rolling contact. |
| Backlash | Higher inherent backlash due to the design. | Lower backlash due to meshing of helical teeth. |
| Efficiency at Higher Speeds | Less suitable for high-speed applications due to efficiency loss. | More suitable for high-speed applications due to higher efficiency. |
| Overload Protection | Natural self-locking feature provides some overload protection. | May not have the same level of inherent overload protection. |
| Applications | Commonly used for applications requiring high reduction ratios, such as conveyor systems and heavy-duty machinery. | Widely used in various applications including automotive transmissions, industrial machinery, and more. |
Both worm and helical gearboxes have their place in engineering, and the choice between them depends on the specific requirements of the application. Worm gearboxes are preferred for applications with high reduction ratios, while helical gearboxes are chosen for their higher efficiency and smoother operation.

Types of Worm Gear Configurations and Their Uses
Worm gear configurations vary based on the arrangement of the worm and the gear it engages with. Here are common types and their applications:
- Single Enveloping Worm Gear: This configuration offers high torque transmission and efficiency. It’s used in heavy-duty applications like mining equipment and industrial machinery.
- Double Enveloping Worm Gear: With increased contact area, this type provides higher load capacity and improved efficiency. It’s used in aerospace applications, robotics, and precision machinery.
- Non-Throated Worm Gear: This type has a cylindrical worm without a throat. It’s suitable for applications requiring precise motion control, such as CNC machines and robotics.
- Throated Worm Gear: Featuring a throat in the worm, this configuration offers smooth engagement and higher load capacity. It’s used in conveyors, elevators, and automotive applications.
- Non-Modular Worm Gear: In this design, the worm and gear are a matched set, resulting in better meshing and efficiency. It’s utilized in various industries where customization is essential.
- Modular Worm Gear: This type allows interchangeability of worm and gear components, providing flexibility in design and maintenance. It’s commonly used in conveyors, mixers, and material handling systems.
Selecting the appropriate worm gear configuration depends on factors such as load capacity, efficiency, precision, and application requirements. Consulting gearbox experts can help determine the best configuration for your specific needs.


editor by CX 2023-12-04