Electric Bobby-Car

As the old steering wheel is designed for kids and will not withstand the acceleration of the motors and adults, it needs to reinforced with a 3D printed part. The files can be found on the files tab.

On the lower side, there are 2 inlets for aluminium parts with inner threads, that you can use to fasten the steel steering rod with 2 M6 screws:

On the top side, the original plastic steering wheel fits the 3D printed part perfectly. There are also 4 cable channels which can be used for the joysticks and the display and further accessories.

When everything is assembled you have a bobbycar with a stronger steering wheel:

Now, you can also print the display holder parts and mount a standard 2.2" SPI display:

For the throttle pedals, I used xbox 360 controller trigger buttons:

The RJ45 connector is used for the 3.3V to the display and the SPI pins. There is no actual ethernet on this cable, but it still looks like a "power over ethernet" system

The display is freely programmable.

To convert the front wheels to electric, I first 3D printed adapters, which can be used to mount the motors on the plastic frame:

The aluminium parts reinforce the 3D print:

Together with the other part it looks like this:

Now it will just replace the original plastic steering system:

The original plastic part that holds everything together can still be used:

Also the steering is still done with the original 10mm bent steel rod:

To convert the bobby car to electric , I did remove the original plastic wheels and replaced them with 6.5" BLDC hub motors which can be found on hoverboards.

First, I used a saw to remove some plastic from there area where the original rear wheels were and made 2 aluminium plates, one with 2 grooves for the motors and a lot of screw holes.

The grooves and M8 screw holes are needed for the hub motors:

The aluminium plates are screw onto a wooden block, that is also mounted on the plastic frame of the original Bobby-Car.

The bottom of the whole Bobby-Car now looks like this:

The cutout in the middle is needed for the electronics, which will be added later.