Choosing a Shaft Coupling for Motor-Gear-Wheel Connection

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SUMMARY

This discussion focuses on selecting the appropriate shaft coupling for connecting a motor to a gear and subsequently to a wheel. The motor shaft measures 11 mm, while the gear shaft is 24 mm, with a maximum torque of 2 Nm and a maximum speed of 70 rpm. The gear shaft outputs to a 32 mm wheel shaft, which has a maximum torque of 112.5 Nm and a maximum speed of approximately 1.24 rpm. Recommendations include using SAE splined flexible spider shaft couplings for budget-friendly options, while bellows couplings are suggested for higher stiffness, albeit with less flexibility.

PREREQUISITES
  • Understanding of shaft coupling types, specifically helical and bellows couplings
  • Knowledge of torque and speed specifications in mechanical systems
  • Familiarity with motor and gear assembly configurations
  • Awareness of material properties, particularly regarding aluminum couplings
NEXT STEPS
  • Research the specifications and applications of SAE splined flexible spider shaft couplings
  • Investigate the advantages and disadvantages of bellows couplings in mechanical assemblies
  • Explore the impact of material selection on coupling performance, focusing on fatigue resistance
  • Learn about proper alignment techniques for motor and gear assemblies to enhance coupling efficiency
USEFUL FOR

Mechanical engineers, design engineers, and technicians involved in motor and gear system design, particularly those focused on optimizing coupling performance and assembly precision.

Mr Zakaria
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Hi guyz,

I need some help in choosing the shaft couplings to connect the motor to the gear and from gear to the wheel.

The motor shaft is 11 mm and the gear shaft is 24 mm. (Max torque 2 Nm, Max speed 70 rpm)
Output of the gear shaft is 32 mm and the wheel shaft is 30 mm. (Max torque 112.5 Nm, Max speed about 1.24 rpm)

I've come across two types of couplings which are helical and below shaft couplings. Which one is better? Or do you guyz have better recommendations?

Thank you very much.
 
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I have had the most success with SAE splined flexible spider shaft couplings.
 
It depends on your budget. I'm not sure what you mean by "below shaft". Do you mean "bellows" coupling? So named because they have a bellow shape.

If cost is not an issue, a bellows coupling will be much stiffer than a helical coupling. The drawback is it is not as flexible. If you don't have a very precise assembly and aren't as concerned with compliance, a helical coupling should work fine.

Stay away from aluminum couplings though. Especially if it is helical. Fatigue is a major consideration and I've had aluminum helical couplings fail on me.
 

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