What does the inside of an Electric Drill Look Like?

What does the inside of an Electric Drill Look Like?

I recently broke an electric drill, by trying to drill through thick metal plate, using a very large drill bit. Some grinding noises came out of the drill and it stopped working.

 This images shows the strange spiral gear at drive the large steel gear, attached to chuck.

 The gear attached to the chuck had become damaged with some of the teeth being ground down, and no longer engaging properly with spiral gear.

In working from the supply side of the drill to the delivery side, in this instance there was:

1. Plug
2. Lead
3. Clamp and Seal (Upon Entry to Drill)
4. Rectifier (turns AC to DC)
5. Trigger (Variable Resistor)
6. Carbon Brushes
7. Electric Motor. Spindle supported in plastic drill casing.
8. Cooling Fan / impeller
9. Simple Gear box
10. chuck.

There is a hammer drill setting on this drill and appear to involve two lumpy plates rubbing on top of one another to create vibrations. 

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