ring gear

Engines with manual tranny usually have a heavy flywheel, typically 5 to 40 kg of cast iron, with the starter band gear shrunk onto the exterior.
That is done by heating the ring to around 200 °C to expand the ring which is then rapidly positioned onto the flywheel, often held in firmly against a location shoulder until coolin in calm air . The interference match between ring gear inside dia. and flywheel, usually ranging from 0.20mm to 0.50mm, renders the starter band firmly attached to the flywheel.

1. Heating must be performed as uniform as feasible and never with a gas burner, as this process causes great temperature variations to the pieces.

2. the temperature should be 200°C. A temperature planetary gearbox higher than 350°C will affect the apparatus tooth hardness.

3. Do not utilize compressed air or coolant to cool down the ring.

4. An accurate centering and flattening of the parts in the flywheel is an absolutely essential condition.

5. The initial center distance should be maintained.

6. Chilly power press system should be avoided due to a substantial stress caused to the hardened region.

Engines with automatic transmissions instead have a pressed steel plate with the starter band equipment usually welded onto the exterior of the plate.


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