The location of the contact patch in the engagement of the main transmission gears
I – forward side;
II – reverse side;
a and b – incorrect contact in the gear engagement: move the drive gear away from the driven gear by reducing the thickness of the adjusting ring;
c and d – incorrect contact: move the drive gear closer to the driven gear by increasing the thickness of the adjusting ring;
e – correct contact in gear engagement
1. For the final test of the quality of the main gear engagement on the stand:
- install the adjusted gearbox on the stand and lubricate the working surfaces of the driven gear teeth with a thin layer of lead oxide;
- launch the stand; use the stand levers to slow down the rotation of the installed axle shafts so that under load, traces of contact with the teeth of the drive gear remain on the surfaces of the teeth of the driven gear;
- change the direction of rotation of the stand and, by braking, obtain contact marks on the other side of the driven gear teeth, which corresponds to the backward movement of the car.
2. The engagement is considered normal if on both sides of the driven gear teeth the contact spot is evenly distributed closer to the narrow end of the tooth, occupying two thirds of its length and not extending to the top and base of the tooth – e. Cases of incorrect divergence of the contact spot on the working surface of the tooth – a, b, c, d.
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3. To adjust the correct position of the drive gear with replacement of the ring, it is necessary to disassemble the unit.
4. When assembling, repeat all operations for pre-tensioning the roller bearings of the drive gear, checking the torque of resistance to rotation, pre-tensioning the roller bearings of the differential box and adjusting the lateral clearance of the engagement of the gears of the main transmission.