ring gear

Engines with manual transmitting usually have much flywheel, typically 5 to 40 kg of cast iron, with the starter band gear shrunk onto the outside.
This is done by heating the ring to around 200 °C to expand the ring which is then rapidly placed onto the flywheel, often held in firmly against a location shoulder until coolin in calm air . The interference fit between ring equipment inside dia. and flywheel, usually ranging from 0.20mm to 0.50mm, renders the starter band firmly mounted on the flywheel.

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

2. the temperature ought to be 200°C. A temperature greater than 350°C will affect the apparatus tooth hardness.

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

4. A precise centering and flattening of the pieces in the flywheel is an absolutely essential condition.

5. The planetary gearbox initial center distance should be maintained.

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

Engines with automated transmissions instead have a pressed metal plate with the starter ring gear usually welded onto the outside of the plate.