Drive Train

The power transmission for the Cycleton One is contained in the rear swing arm. In this post I am going to explain as much as I can about the design and build processes without giving away the trade secret goodies.  I will say; however, that the motor is a custom build from Astro Flight and I was heavily inspired by this guy's electric recumbent motor set-up.

The three stage gear reduction system goes from the motor to a timing pulley, then through a jackshaft to the front sprocket and finally to the drive sprocket at the rear wheel.

The motor is fully adjustable in the mount to adjust belt tension and better alignment.

Several iterations of Masonite mock-ups were done to get the design right.

Final parts were water jet cut out of .25" aluminum and then hand milled for precision fit

A special jig was made to mill out press-fit bearing surfaces

Workin' it out

The focal point of the right side of the bike. I did run into some rubbing problems, but I think a smaller diameter timing pulley should rectify the situation.

SU2010 Grad Show sneak preview photos

What a Cycleton boutique showroom might look like

Myself and instructor for the project Bumsuk Lim

Branded Typograform chandelier

Mahogany wedges keep bike in place

The "tank"

The idea for keeping a "gas tank" form incorporated as part of the final design didn't come easily. As a designer, I usually try to ensure that everything is justified by function and this is usually reflected in form. The decision to place a volume where the gas tank usually is, came from the insight that riders expect and need to feel something substantial between their legs. The need is both a function of control in corners and to inspire overall confidence.  The form that you see today went through several tens of iterations from bare essential "knee-paddles" to more traditional forms. Finally I settled on a shape that would offer enough volume and surface area please the rider's ego and hide some electrics; yet, still be minimal and light in appearance and weight.

Tank/seat half way through clay

The process of actually building the seat and tank was long and exhausting. For the sake of staying interesting, I will try to stick to the highlights:

     1.  Build the base and pack on clay.

     2.  CNC the basic SolidWorks model into the clay.
     3.  Make changes in tape wall drawing and then on one-half of the clay.
     4.  Get help from Ryan Black-Macken with mirroring and adding a body line.

Initial hand modifications

     5.  Finalize changes in tank and mirroring.

     6.  Spray clay with magic rubber spray paint.

     7.  Make a three-part mold utilizing soft silicone surface backed by 20 min plaster.

Part sprayed with barrier and beginning to make parting line for mold

                                      

     8.  Cast multiple layers of fiberglass and carbon fiber to ensure strength.

     9.  Clean up edges with die grinder and begin Bondo work.

   10.  Enlist help of paint guru brother Antonio Yorba to tirelessly straiten wavy surfaces

          and fill pin holes.

How the lower fairing looked after removal from mold

      11.   Prime and sand at intervals of 100, 180, 240,320,400,and 600 

              (the last two being wet)..

      12.   Mask and spray interior surfaces with textured paint for

              durability and aesthetics. 

      13.   Mask and spray two tone parting lines for color graphics.

      14.   Paint is three-part base/pearl/clear.

This is pretty much where I am at now.  This still leaves a need for a way to mount the seat and tank on the frame. I have a good idea of how that will happen, and I will be posting sketches and solutions on that as it comes. 

More appropriate tank photos to come