How to Calculate Gear Speed in RPM?

  • Context: Automotive 
  • Thread starter Thread starter The Jargon
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    Gear Rpm Speed
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SUMMARY

To calculate gear speed in RPM, one must understand the relationship between input shaft speed, output shaft speed, gear ratios, and tire size. The input shaft speed, typically from the engine, directly influences the output shaft speed based on the gear ratio. For accurate calculations, it is essential to clarify that the term "gear speed" refers to the rotational speed of the shafts, particularly the transmission input shaft. Understanding these parameters allows for precise RPM calculations in automotive applications.

PREREQUISITES
  • Understanding of input and output shaft dynamics
  • Knowledge of gear ratios and their impact on speed
  • Familiarity with RPM calculations in mechanical systems
  • Basic concepts of automotive transmission systems
NEXT STEPS
  • Research how to calculate RPM using gear ratios
  • Learn about the relationship between engine speed and transmission input shaft speed
  • Explore the effects of tire size on vehicle speed calculations
  • Study automotive transmission types and their operational principles
USEFUL FOR

Automotive engineers, mechanics, and students studying mechanical engineering who are interested in understanding gear dynamics and RPM calculations in vehicles.

The Jargon
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Hi guys,

How would I go about calculating gear speed in rpm? If I know the input shaft speed, output shaft speed, gear ratios and tyre size.

Thanks.
 
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What do you mean by 'gear speed' in rpm?
 
xxChrisxx said:
What do you mean by 'gear speed' in rpm?

How fast the gear is spinning.
 
Well they'd be spinning at the same speed as the shafts.
 
Sorry I meant engine speed haha, don't know why I said gear speed.
 
By input shaft, I assume you mean transmission input shaft.

What is driving / controlling the speed of this shaft?
 

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