Final Drive - Checking Tooth Contact Pattern

TO CHECK THE TOOTH CONTACT PATTERN
Sparingly paint eight or ten of the drive gear teeth with a stiff mixture of marking raddle or engineers blue.

Move the painted gear teeth in mesh with the pinion until a good impression of the total contact is obtained.

The result should conform with the ideal tooth contact pattern.

A The HEEL is the larger outer end of the tooth.
B The TOE is the small or inner end of the tooth.
C The DRIVE side of the drive gear tooth is convex.
D The COAST side of the drive gear tooth is concave.




Fig 1 Ideal tooth contact pattern.



Fig 2 High tooth contact pattern.



Fig 3 Low tooth contact pattern.



Fig 4 Toe contact pattern.



Fig 5 Heel contact pattern.