GOBAO ECVT EMTB Mid-Drive Motor

[Astro66]

Once I rode an electric offroad motorbike with regen and was surprised how much range it was generating when riding down a fire road from about 1000m back to the valley.

This is the thing with an EMTB. If you use your legs mostly to accelerate, and only a little bit of assist, then regen for braking. You can capture quite a significant amount of energy, compared to what you are drawing from the battery.

 

[Astro66]

thanks - so the chain ring (ring gear?) would be driven via chain or belt from the rear wheel's inertia (whilst the pedals are disengaged) direct to the output gear - which in turn would force the motor to act as a dynamo
but at the same time the motor creates a braking force that is transmitted back to the rear wheel via the output gear via the belt.
I'm partly there... but maybe I need some diagrams

No, the output gear is where your chain connects. But effectively it is the same, just connected through a gear. Basically where the toy wheel is, is where your chainring goes.

Also. The wheel that says ICE, is where your pedal cranks connect.

Also. Those red planetary gears can spin freely on the ends of those shafts. So if your feet are stationary on the cranks, and the bike is coasting. Those red planetary gears will spin freely, driven by the ring gear, and not drive the pedals.

 

[emtbeast]

There are some limitations on regen can't be implemented in a way that the rear wheel via the chain and rear wheel inertia would enable regen. I think that this not a viable solution for regeneration on an emtb.

1. It would need a fixed rear hub, that adds problems for full suspension.

2. A fast spinning chain that now has tension on the underside not on the top as usually. That would mean slop on the top adding a serious possibility of chain derailment.

I think the only possible way of regen in an parallel ecvt mtb drive(what the versions of Gobao an Avinox due to the shape design most probably are) is only possible with active pedaling. The regen capability being different according to the riding situation.

 

[jeanjean]

Points 1 and 2 exist and are already solved on motorbikes, so it is likely that they can be solved on e-mtb as well.

 

[jeanjean]

Anyway I don't need regen.
I'm never living my house on e-mtb without the solar panels on my backpack

 

[Astro66]

Someone was suggesting a concentric pivot to alleviate suspension issues. Gets rid of the need for a tensioner, as there is no chain or belt growth and obviously, no derailleur. So the chainstay attaches around the output shaft\chainring, on the MGU.

 

[jeanjean]

US20200407016A1 - Power train - Google Patents

A power train for a pedal vehicle includes a main output chainring and a secondary output chainring coupled to the crankset shaft by a first freewheel. The crankset shaft is coupled to the main output chainring via a deformable transmission element and an epicyclic gear.

patents.google.com

See paragraphs 154 and 155

Even small things can cause regeneration...

 

[Ride 2d@y]

You can run a smaller battery. Drop some weight.

Also run lighter brakes too I would think

 

[Ndanger]

Adding regen to a e CVT , which is already complex and likely at a weight disadvantage would compound both challenges . Sadly, hub motors were born to regenerate, simply and at lower weight.