Gearbox design-Is this design possible to make the output shaft thin?

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SUMMARY

The discussion centers on the feasibility of designing a thin output shaft for a gearbox, emphasizing the importance of proper bearing alignment and support. It highlights that there is no singular correct design, as multiple solutions exist depending on specific requirements such as power transmission, RPM, and torque calculations. Key considerations include the use of flexible couplings and the need for careful alignment to ensure longevity and performance. The conversation also suggests utilizing self-aligning bearings and a compression strut to manage belt tension effectively.

PREREQUISITES
  • Understanding of gearbox design principles
  • Familiarity with bearing types and their applications
  • Knowledge of torque calculations and shaft diameter requirements
  • Experience with belt drive systems and their mechanics
NEXT STEPS
  • Research "torque calculation methods for shafts" to determine minimum shaft diameter
  • Explore "self-aligning bearing applications" for effective load management
  • Learn about "flexible coupling designs" to enhance gearbox performance
  • Investigate "belt tension analysis techniques" to optimize drive systems
USEFUL FOR

Mechanical engineers, gearbox designers, and anyone involved in the design and optimization of belt-driven systems will benefit from this discussion.

a61098417
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TL;DR
The output shaft of the gearbox undergoes torque and bending force(tensile force of the belt)(I use belt after gearbox). If I mount/fix the pulley on other things instead of the output shaft, the belt won't bend the shaft. Thus, the output shaft gets torque only. Is my design correct?
Is this design correct?
 
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a61098417 said:
Is this design correct?
There are many solutions. There is no one correct design.

Where an additional bearing is provided, it must be positioned and aligned correctly, or it will not carry the required forces without increasing stresses in the shaft. Will you have a flexible coupling between the gearbox and the pulley shaft?

The problem with supporting the output shaft on both sides of the belt pulley is that you are restricted to a mounting that enables you to change the belts quickly, without special tools.

What does the belt drive? A compression strut, floating in spherical self-aligning bearings, between two shafts, can counter the belt tension, while making it possible to change the belt quickly.

Specify the power to be transmitted.
Specify the RPM of the output shaft.
Compute the torque in the shaft.
Specify the pulley diameter and the tension in the belt.

The minimum possible shaft diameter to consider must satisfy that torque requirement.
Now analyse the bending due to belt tension with one or two support pulleys.
 
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