Overview
Motovario B153 28.23:1 bevel gearbox with a 90mm hollow bore output and 225B5 IEC motor input, suited to industrial right-angle drive applications where controlled speed reduction and efficient torque transfer are required.
Manufactured for dependable plant and OEM use, it provides steady operating performance, reliable torque delivery, and durable gearbox operation in continuous-duty service.
Medium Reduction: Designed for applications requiring moderate speed reduction with consistent torque output, supporting reliable performance in packaging, conveying, and plant automation equipment.
This arrangement combines a 90mm hollow output bore with a 225B5 IEC motor input, helping create a secure and practical drive solution for packaging equipment, conveying systems, transfer lines, and general industrial machinery.
With its 225B5 IEC flange input, the gearbox can be matched with larger IEC motors, supporting flexible drive selection while preserving a compact right-angle format and robust industrial capability.
Included in the modular Motovario B Series bevel helical gearbox family, this unit is designed for adaptable mounting, straightforward motor integration, and long-term reliable service.
Key Specifications
Regulations: No
Bevel Helical: PAM B
Size: 153
Housing Version: U-Universal
Output Shaft Version: C-Hollow Shaft
Ratio (i): 28.23
Input Dim: Ø450 x 60 (IEC225 B5)
Output Shaft Dim: Ø90
Rotation Direction: Standard
ON-Oil Plugs: Breather-Drain-Level (Standard)
Mounting Position: B3
ON-Output Oil Seal: NBR-Nitrile
ON-Input Oil Seal: NBR-Nitrile
ON-Output Bearings: Taper Roller Bearings
ON-Lubrication: Without Oil
Paint: RAL 5010 Blue
Output Speed (4-Pole vs 2-Pole Motors)
Calculated nominal output speed using a standard IEC motor:
| Motor Type | Input Speed (rpm) | Estimated Output Speed (rpm) |
|---|---|---|
| 4-Pole | 1400 | ~50 rpm |
| 2-Pole | 2800 | ~99 rpm |
Need torque confirmation? Output torque depends on motor power (kW), gearbox efficiency, and service factor. Use our Gearbox Service Factor Calculator or contact us for verified torque figures.
Motor Input Chart (IEC Flange Details)
This gearbox is supplied with a 225B5 IEC motor input. Confirm flange compatibility below:
| Motor Input | IEC Standard | Input Dimensions |
|---|---|---|
| 225B5 | IEC 60072 / IEC 60034 (B5 flange) | Ø450 x 60 |
If you’re unsure whether your motor is B5 or B14, contact our technical team and we’ll confirm compatibility.
Internal Links & Compatible Options
Same ratio, different motor input: jump to the B153 28.23:1 variant you need with a 90mm bore.
Need a different ratio? Explore the closest B153 90mm bore ratios to this version.
More B153 options: Browse all Motovario B153 gearbox ratios
Explore the full B Series range: Motovario B Series bevel gearboxes
Helpful calculators: Gearbox Ratio & Speed Calculator | Output Torque Calculator
Need the non-standard 80mm bore option?
If your application requires a 80mm output bore instead of the standard 90mm, we can supply this as a non-standard configuration. View available B103 options and request the 80mm version here: Motovario B153 Gearbox.
Ratio Selection Tips
Best for: applications needing controlled speed reduction and reliable torque delivery, including conveyors, packaging systems, production lines, and general industrial automation.
Selection tip: a 28.23:1 ratio is a practical option where moderate reduction is needed to improve torque output while still maintaining efficient machine speed. It works well in compact drive systems that need dependable continuous-duty performance without moving to a much slower final output speed. Always assess starting conditions, running load, and service demands before selection.
FAQ
Will this ratio be too fast for my application?
A 28.23:1 ratio is typically selected when a balanced output speed is preferred. If your application requires a very slow shaft speed or higher torque concentration, choosing a higher ratio may provide a better match.
Can I run this with a VFD?
Yes — a VFD can be used to give smoother starts, better speed control, and more flexibility in operation. As always, extended low-speed operation should be checked for motor cooling suitability.
Configuration Notes
Input flange note: the 225B5 IEC input flange supports compatibility with larger IEC motors, making this configuration suitable for industrial duties where motor size and mounting stability matter.
Output bore note: the 90mm hollow bore provides a robust connection point for larger driven shafts, supporting effective torque transfer and dependable mechanical engagement.
Application example: ideal for packaging lines, conveyors, and handling systems where compact right-angle installation, steady torque transfer, and moderate reduction are required.
Need help selecting the correct ratio, bore size, or motor input?
Contact our gearbox specialists for sizing support, torque checks, and availability confirmation.
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