Enter the input gear teeth and the output gear teeth into the Calculator. The calculator will evaluate the Speed Increase Ratio. 

Speed Increase Ratio Formula

SIR = IGT / OGT

Variables:

  • SIR is the Speed Increase Ratio ()
  • IGT is the input gear teeth
  • OGT is the output gear teeth

To calculate Speed Increase Ratio,

How to Calculate Speed Increase Ratio?

The following steps outline how to calculate the Speed Increase Ratio.


  1. First, determine the input gear teeth. 
  2. Next, determine the output gear teeth. 
  3. Next, gather the formula from above = SIR = IGT / OGT.
  4. Finally, calculate the Speed Increase Ratio.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

input gear teeth = 20

output gear teeth = 10

FAQs

What is the significance of the Speed Increase Ratio in mechanical systems?

The Speed Increase Ratio (SIR) is crucial in mechanical systems as it helps in determining how much the speed of the output shaft will be increased or decreased relative to the input shaft. This is essential for designing systems that require specific speed outputs, such as in automotive transmissions, machinery, and robotics.

How can incorrect calculations of the Speed Increase Ratio affect a machine’s performance?

Incorrect calculations of the SIR can lead to inefficiencies in the machine’s operation, including excessive wear on components, increased energy consumption, and failure to achieve desired speed outputs. This can result in reduced performance, increased maintenance costs, and potentially the need for costly repairs or adjustments.

Can the Speed Increase Ratio be applied to any type of gears?

Yes, the concept of Speed Increase Ratio can be applied to various types of gears, including spur, helical, bevel, and worm gears. The fundamental principle of calculating the ratio between the input and output gear teeth remains the same, although the specific design and application may influence the efficiency and effectiveness of the speed increase or decrease.

Is there a limit to how much the Speed Increase Ratio can be adjusted in a gear system?

While theoretically, gear ratios can be designed to achieve a wide range of speed increases or decreases, practical limitations exist due to factors such as gear size, strength, and the physical space available within a machine. Extremely high or low ratios may require complex gear arrangements or lead to decreased efficiency and increased wear. Therefore, it’s crucial to balance the desired SIR with these practical considerations.