Reductor assembly for MY1020 motor

grabcad

I made this assembly design for a little kid buggy. It had this little Aliexpress gearbox (1:5 ratio) attached on the original gas powered motor. I adapted an electric 3kW 72V MY1020 motor on it. Can be usefull cause gear ratio is often a point when you uses this kind of motor and there is almost nothing available on the shelf. All made of 3D print parts, laser cut and welding. Works well.Reductor link: https://fr.aliexpress.com/item/1005002592616722.html?spm=a2g0o.order_list.order_list_main.21.433f5e5b56jbkE&gatewayAdapt=glo2fraMotor/controller link: https://fr.aliexpress.com/item/1005004128870655.html?spm=a2g0o.productlist.main.5.46902c3cbNacue&algo_pvid=e89cfa4f-0ebe-47ae-8f97-bbcea8dfe166&aem_p4p_detail=202311010647332882885286411740001049252&algo_exp_id=e89cfa4f-0ebe-47ae-8f97-bbcea8dfe166-2&pdp_npi=4%40dis%21EUR%21239.78%21143.87%21%21%21247.55%21%21%40211b618e16988464538607669e01e7%2112000028131006421%21sea%21FR%212459087300%21&curPageLogUid=6bj4TYKagn8J&search_p4p_id=202311010647332882885286411740001049252_3 (I used the 72V 3000W set1)WARNING: as expected, the bearing in the little gearbox are shit. Advise you to replace with good quality, here the sizes:Input shaft => 629-Z + 6000-Z SPY 10mm / 22mm / th7mmOutput shaft => 6002-Z (X2) + SPY 15mm / 25mm / th7mmMotor => 6001-2RS (X2)I also used 428 chain standard instead of the T8F that comes with the gearbox. T8F is too light to support the torque. I Lasercut the sprockets and welded 13T 428 the little T8F so it fits with the shaft.