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Gear Noise

Related Links : 齿轮的噪音 - 中文版

1-9 Gear Noise

This figure indicates the results of a survey conducted by a manufacturer that produces gears for automobile, machine tools and speed reducers.
cause of vibration
Cause of noise and vibration :

  1. Accuracy of gears
  2. Accuracy of assembly
  3. Tooth surface finish
  4. Configuration of gearbox
  5. Lubrication of gears
  6. Bearing
  7. Material of gears
  8. Design of gears
  9. Motor and variation of load
  10. Driving condition
  11. Shaft and shaft alignment
  12. Configuration of gears
  13. Wear of gears
  14. Surface damage on gears
  15. Others

Broken down by the factors contributing to gear noise, it becomes :

Causes (Items assumed to have effects on noise) :

In order to manufacture gears that minimize noise during operation :

To improve surface finish, gears are generally shaved or ground. Spiral bevel gears are lapped or ground.
Left : Crowning of tooth
Right : Chamfering of tooth
edge contact
Example of edge contact

This figure shows an example of data regarding noise level as a result of test on KHK stock gears.
▲ - ▲ : S45C without heat treatment
(SS2.5-24, SS2.5-48)
△ - △ : Plastic
(PS2.5-24, PS2.5-48)
● - ● : S45C Tooth surface high-frequency induction hardened and ground
(SSG2.5-24, SSG2.5-48)
○ - ○ : SCM415 Overall carburizing and quenching, tooth surface ground
(MSGB2.5-24, MSGB2.5-48)

noise level
Noise level of KHK stock gears  1984 - 1985
Vertical line – Decibel (db)
Horizontal line – n 1(rpm)

Related links :
Spur Gears – Main page of spur gears
How to reduce Gear Noise – A page of Gear Technical Reference

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