Tooth Contact Of HYPOID Gear

1. Adjust until correct teeth contact is obtained.
2. Check tooth contact as follows.

• Tooth contact

  Checking item: Tooth contact pattern is slightly shifted to toe side under no-load rotation. [When loaded, contact pattern moves toward heel.] 

  Fig 1: Checking Tooth Contact

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• Face contact

  Checking item: Backlash is too large. 

  Contact pattern

  Fig 2: Identifying Tooth Contact - Backlash Too Large

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  Corrective action: Reduce thickness of pinion height adjusting washer in order to bring drive pinion closer to driven gear.

  Fig 3: Identifying Driving Pinion And Driven Gear

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• Flank contact

  Checking item: Backlash is too small. 

  Contact pattern

  Fig 4: Identifying Contact Pattern Of Teeth - Backlash Too Small

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  Corrective action: Increase thickness of pinion height adjusting washer in order to bring drive pinion away from driven gear.

  Fig 5: Bringing Drive Pinion Away From Driven Gear

  Courtesy of SUBARU OF AMERICA, INC.
• Toe contact (inside end contact)

  Checking item: Contact area is small. 

  Contact pattern

  Fig 6: Identifying Contact Pattern Of Teeth - Contact Area Small

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  Corrective action: Increase thickness of pinion height adjusting washer in order to bring drive pinion closer to driven gear.

  Fig 7: Identifying Bringing Drive Pinion Closer To Driven Gear

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• Heel contact (outside end contact)

Checking item: Contact area is small. 

Contact pattern

Fig 8: Identifying Tooth Contact Pattern - Contact Area Small

Courtesy of SUBARU OF AMERICA, INC.

Corrective action: Reduce thickness of pinion height adjusting washer in order to bring drive pinion away from driven gear.

Fig 9: Bringing Drive Pinion Away From Driven Gear

Courtesy of SUBARU OF AMERICA, INC.