Four Wheels Velomobile Gearbox and differential.

Quadri-mobile project.
http://www.amidesign.ch/en_hpv-velo-mobile.htm
In July 2008, I decided to build a quadricycle.
This is the gearbox and the differentail in action.

Category:

Autos & Vehicles

Tags:

• Recumbent bicycle
• recumbent trike
• recumbent
• velomobile
• velomobil
• trike
• quadricycle
• pedal car
• HPV
• vehicle
• streamliner
• homemade
• fairing
• disc brake
• blender design
• sprocket
• double wishbone
• 20 mm thru axle

[Samqdf]

Here is an idea for you, on my 3x3 trike I am making I instead of having a differential am going to have freewheeling hubs. The easy way to do it in an application as shown in the video would be to have a BMX freewheel for either axle with two chains powering them together. So when going around a corner the outside wheel can spped up. The down side is the inside wheel won't slow down so it will temporarily get harder to pedal. Hey can you post a vid of what you have now instead?

[amidesign]

@Samqdf

Now, for my velomobile with four wheels I adopted the two freewheels solution instead the conventional differential

I chooses freewheels based on roller bearings

They are much lighter than BMX parts

[Samqdf]

@amidesign one way needle bearings? I looked into it but I wasn't sure it was enough to hold up with the stress, so they work ok?

[amidesign]

@Samqdf

I discover your thread 3x3 trike in the Bentrider forum

Very nice work !

[ChrisLuxembourg]

Salut!

Perfect design! My idea, what's about if you take 2 normal hubs at the drivesystem? Example, you steer left, then the right wheel is currently not powered. After steering the balance of the power is equal again. Take a look again into "ENFORCER 6x2inox", there I've got a transmission axle that splits the power the left hub and the right hub. You only must remove the coaster brake, because if you run back the one breaks the other! Greetings, Chris

[amidesign]

Thanks for the comment.

I have changed my mind : I abandoned the differential systeme. Now I have two half axle and I can choose wich I drive. With a little lever and a cable I can put the chaine on the right wheel when I turn left and I can put the power on left wheel when I turn right. I can choose wich wheel is driven when I drive in strait line.

I never will drive on mud or grass and the differential is not needful.

[Samqdf]

@amidesign thanks but it would be more impressive if all the parts I have made so far would take up more space than an ice-cream bucket! oh well I will keep at it. I might do a video myself when I have finished the rough model I am making as a rest run, it's just bits welded together to see if it will all fit ok and be comfortable.

[amidesign]

Hello,

You have right. All waht I have designed is very heavy. The front axle weight is 10 kg. The rear axle is also 10 or 15 kg. The body also 15 kg for a total weight off 40 kg.

I am now thinking to simplifie and optimise the velomobile.

You can see some pics on my Web Site

on page velomobile.

[ReisendeEuropa]

I've been thinking of building a quad as well. Your design is a bit complex and heavy looking for a velomobile. How much would this weigh? Think of something simpler. I've figured out a very simple one that uses standard bike parts, but I haven't built it yet.