Effects of Excessive or Insufficient Gear Backlash

1. Effects of Excessive Backlash

• Large backlash causes significant lost motion, resulting in poor positioning accuracy, especially for precision machinery.

• Produces heavy noise, vibration and impact during reversing, leading to tooth surface fatigue, pitting, chipping or even tooth breakage.

• Unstable transmission and reduced transmission rigidity.

2. Effects of Insufficient Backlash

• No enough space for lubricating oil film, causing serious heating, wear and scoring of gear teeth.

• Thermal expansion during operation may lead to jamming or seizing.

• Increased friction and accelerated wear, greatly shortening service life.

• Abnormal noise and extra load on bearings.

3. Summary

• Excessive backlash: Noise, impact, poor positioning, easy tooth breakage.

• Insufficient backlash: Heating, wear, jamming, scoring, short service life.

• Proper backlash: Ensures lubrication, compensates thermal expansion, avoids interference and controls positioning error.