Motorcycle Enthusiasts

Hi

hi any cao software could do the trick, catia solidworks etc

as for the drawing, I work with a skeleton and then I draw the tubes

@+

You should start from reading books about motorcycle chassis design and selection of desired engine power. As motorcycles are like a jet fighters - built around the engine.

And why do you want in-hub motor? That kind of motors is good only for slow vehicles, like ultra-light mopeds and extra heavy mining trucks.

I already read this book:

https://books.google.ro/books/about/Motorcycle_Handling_and_Chassis_Design.html?id=84hF-qoR5I8C&redir_esc=y

Actually at the moment the in hub motor are quite powerful, of course not like the huge engines with hundreds of horse power.

Based on what I read until now, the hub motor would be nice for a city motorcycle or a cruiser, given the extra space for the battery in the chassis.

The downside is the extra unsprung mass and the CoG which has to be adjusted.

That's why I'm looking at making a frame.

Also for the unsprung part I started reading :https://books.google.ro/books?id=GWR_H3cMRLoC

>>>The downside is the extra unsprung mass

That is the main reason why all proper bikes don't use in-hub motors.

Review design of following manufaturers and models:

• Brammo
• Zero
• KTM E-SX

You can see that separate motor on those bikes is quite compact, so moving a motor into wheel will not save much space for you.

Other reasons for separate electric motor: much easier to hydroisolate it, so rainy and dusty conditions would not shortcircuit your engine, and easier to replace or upgrade your engine at any time.

Btw, good examples:

https://silodrome.com/exodyne-electric-motorcycle/

http://essencemotocycles.com/

First one should better fit to the budget.

Thank you for the examples.

The easiest way to overcome the unsprung mass issue would be using a hardtail design or maybe a soft tail.

Hardtail design aggravates unsprung mass issue to maximum :)

And the "Soft tail" is a suspension design that visually imitates a hard tail.

I want to build an Electric ATV / UTV. I know very little about CAD and just getting started. Any suggestions on how to get started?

Thanks for any suggestions!

Hoi Josh,

Try from AutoDesk " Inventor 2019."

This is the link for downloading the program.

You will get a licence for 3 years.

https://www.autodesk.com/education/free-software/featured

Greetings,

Danny

I would do a 3d sketch in solidworks and use the weldment feature to make it.

Motorcycle geometry is a very complex subject, and just guessing at the location and mounting of the various components is a good way to discover just how difficult it is to get right.

First, do not mount the motor in the rear wheel: the unsprung weight has a significant effect on the compliance of the rear suspension, also causes excessive squat in the rear when the throttle is closed, and the reverse when the throttle is applied, making a smooth transition from on / off quite difficult.

For a succinct video on that subject go here: https://www.youtube.com/watch?v=Nmz1QJTDzO8

And for a comprehensive book on the subject by Tony Foale: https://motochassis.com/

He has been one of the leaders in codifying motorcycle geometry for over fifty years, and still occasionally road races.

Another luminary you may want to check out is Norman Hossack, the inventor of the Hossack front suspension.

https://www.hossack-design.com/

I have made several front suspensions using his concepts, and there are significant advantages to it. In fact, BMW introduced a motorcycle using his design under license, called "Duolever", and Honda is using a similar front suspension on their latest Gold Wing, which is just different enough to skirt his patents. He stated that their efforts with his concepts were a vindication of his design.

My advice is to get a less expensive CAD program and play with it until you have a good grasp of the basics. My preference is Punch! ViaCAD 2D / 3D. It's a good starting program, and since I bought it about twenty years ago it has earned well in excess of 1,000 times it initial cost. Of course Solidworks is the industry standard, but you never own it ... the costs keep piling up!

My qualifications as regards motorcycles started when I was three years old, and continues to this day, spanning over sixty years, riding, roadracing, building from the ground up, modifying, and race prepping motorcycles. Cumulatively 800,000 miles on the street and track. And I have the scars to prove it.

Good luck!

Rob

No ATV's or UTV's here....

MOTORCYCLES=2 wheels

For a rigid frame or a motorcycle, a hub motor drive will have no real-world influence on handling provided it's only used on the rear wheel and the weight distribution is evenly divided between front and rear wheels. Put a hub motor in the front and you're going to have something terrifying to ride (and end up crashing). Motorcycles are very sensitive to polar moment and weight distribution. A hub motor drive is going to severly compromise suspension function that's oriented towards off-road use (long travel suspension).