ring gear

Engines with manual transmitting usually have a heavy flywheel, typically 5 to 40 kg of cast iron, with the starter ring gear shrunk onto the outside.
That is done by planetary gearbox 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 spot 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 carried out as uniform as feasible rather than with a gas burner, as this process causes great temperature variations to the pieces.

2. the temperature should be 200°C. A temperature greater than 350°C will affect the gear tooth hardness.

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

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

5. The original center distance should be maintained.

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

Engines with automatic transmissions instead possess a pressed metal plate with the starter band equipment usually welded onto the outside of the plate.

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