In order to reduce the noise of a gear drive, two 8-pitch spur gears with 20 and 40 teeth are to be...

Question

In order to reduce the noise of a gear drive, two 8-pitch spur gears with 20 and 40 teeth are to be replaced with helical gears. The new set must have the same velocity ratio and center distance. Specify two helical gears, which will be formed on a hob, to accomplish the task.

David · Accepted Answer

Calculate the velocity ratio as shown:
And calculate centre distance as shown:
Where pitch diameter of gear is  
Determine
Pitch of gear is  
Number of teeth is  
Substitute 8 for  and 20 for and 40 for
So centre distance is,
Calculate the centre distance for helical gears as shown below:

In order to reduce the noise of a gear drive, two 8-pitch spur gears with 20 and 40 teeth are to be replaced with helical gears. The new set must have the same velocity ratio and center distance....

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