How to remove the drill chuck of the old electric drill with aluminum shell?

At present, the structure of wrench drill chuck in the market can be roughly divided into two types, one is that the bevel gear shell is integrated, and the other is that the stamping shell and bevel gear are static fit. The first kind of disassembly of the drill chuck of the integral bevel gear is generally to put something on the back of the integral bevel gear, and directly tap the core of the drill chuck, so that the inner ring of the bevel gear can be detached from the two bevel thread rings which are statically matched with it. The second is the disassembly of the static fit between the stamping shell and the bevel gear (the inner ring of the bevel gear is tapered thread ring). Tap the joint between the stamping shell and the two bevel gears with a small flat shovel to separate them, and then the drill chuck can be completely disassembled.