Shimano CB-E110 Coaster Brake Hub Internal Kit | bike-hubs

That is likely a clone of a Shimano coaster brake style hub (CB-E110). (It may be a real one.) Anyway, it should have three bearings and two brake shoes. I would just replace everything. The easiest way to fix it is to buy a coaster brake hub on Amazon for under 20 bucks. (First link below.) Take it apart, while taking pictures of the process with your phone. Re-assemble into your hub. The second link shows what the internals should look like. https://www.amazon.com/ZZRSDAN-Silver-Bicycle-Coaster-Stainless/dp/B0F9V86G6F/ref=sr_1_4 https://www.amazon.com/Coaster-Brake-Shimano-Repair-E110/dp/B00288N5AO/ref=sr_1_24 You will need to use a screwdriver to take off the clip holding the sprocket on to the old hub.