GEBE And Friction Drive Combination

[TREEWK]

2pedal,
HERE`S SOME PIC`S OF MY START OF A BELT DRIVE. MACHINE SHOP CUT THE TINY LITTLE 9 TOOTH SPROCKET OFF (#25 CHAIN) AND TRIMMED IT BACK SO THE COG JUST CLEARS THE CLUTCH BELL HOUSING.

THEY DRILLED AND TAPPED IT ON THE LATHE SO IT ALL RUNS TRUE AT THE SAME TIME.
I ALSO HAVE THE BELL HOUSINGS THAT HAVE THE OUTER BEARING. THE COG WOULD HAVE TO BE NARROWED AND THE SET SCREW MACHINED ON THE OUTER END TO FIT IN THE SMALL OUTER BRG.

RON

 

[Tanaka40]

Nice machine work

That's some nice machine shop work.

 

[5-7HEAVEN]

Good job, Ron!

It's nice to see tinkerers working outside of the box, trying to make a better(or cheaper) mousetrap.

Keep up the good work, TREEWK!

 

[TREEWK]

Thanks Guy`s,

I Needed That As My Titan Shifter Got Bad Review`s Today On This Forum.

The Little People Brought Laughter!! Lol, What Would We Do Without Them??

Got Full Of Myself And Posted Many Word`s And Pic`s To Impress The -them (word Change Took Place). My Bad, Bad, Need To Get A Grip.

You Guy`s Made My Day! Am Whole Again! Your Check`s Are In The Mail.

Ron

 

[5-7HEAVEN]

Let me inspect your Titan shifter thread.

Ah'lll be bahk....

Okay, I'm back.

It's very similar to Scooterguy's frame-mount-thru-the-gears, which I'm in the process of installing.

FWIW, it's one of very few ways to run a utility engine thru the bike's gears without a big-sss gearbox. The 5:1 pocketbike trans is the key.

Very soon, there will come a time when the Titan?Honda/Mitsubishi engines will mount midframe with aesthetic appropriateness(look good).

And Ron and I will be there to frame-mount our engines.

Right, TREEWK?!

 

[2Fat2Pedal]

Outstanding Ron. The non-kit projects are definitely the most interesting. When my busted shoulder heals (several months) I may copy you and continue with my belt-drive attempt...or maybe copy 5-7. I've got a new Tanaka TC-47 waiting to be used.

Also love the Scooter-guy shifter design. For me function trumps form.

2Fat

 

[5-7HEAVEN]

The pulley I ordered from ebay arrived; it fit perfectly onto the BMP shaft and has two 6-32 setscrews.

I emailed GEBE about my project; Julia was kind enough to offer information. She said that their HTD drive ring should work okay with my XL aluminum drive pulley. That's good to know. I just need to install and measure for the belt.

Also awaiting a response from a pulley manufacturer. My contact says that they can make one to my specs, heat-treated and keyed.

I'm stoked. so far it's a very inexpensive prototype. Hopefully the custom pulley doesn't break the budget.

 

[5-7HEAVEN]

The saga continues...

My HTD belts arrived. I needed one measuring 1524mm. None was available, so I ordered a 1500mm belt. The next size up was a 1595mm belt. Each cost $10. The 1500mm belt is too short, so the friction housing sits below horizontal. Even with the belt adjusted tightly, the jackshaft rests atop the tire.

I just realized that I can exert extreme tension onto the belt by adjusting the friction housing's rear struts. HOWEVER, methinks this will shift the GEBE drive ring off its center.

Time to change to the 1595mm belt, because the 1500mm one is WAY too short. Also time to fab a simple belt tensioner.

Also received steel 14-tooth and 15-tooth HTD pulleys via air mail. Each cost $8.00. The 15-tooth pully that was on the bike has an XL-pitch, so its teeth don't match the HTD-pitch belt and drive ring. Julia at GEBE said it'd work, but I don't wanna take that chance. These pulleys have 1/4" bore; they need to be bored to 1/2" and cut for keyway.

I replaced the BMP axle with 1/2" keyed shaft. My friend tried to machine and tap it for the clutch drum, but it came out crooked. A machine shop will correct that and modify the pulleys.

Also drilled motor mount holes on the opposite side of the friction housing.

So far, it will cost $70 in parts to duplicate my efforts, plus shipping and minor machine work.

Okay, so I changed the 1500mm to the 1595mm belt. The friction housing sits perfectly, the jackshaft is 5/8" off the tire and of course the belt is almost 4" longer.

This is going to look like a serpentine belt, once the tensioner is in place.

I'm almost done...

 

[vegaspaddy]

good work 5-7, the hardest part is always waiting for the parts to arrive, can't wait to see the results of you mods, be sure to get some pics up....

 

[Tanaka40]

The 15-tooth pully that was on the bike has an XL-pitch, so its teeth don't match the HTD-pitch belt and drive ring.:

Hey why not use the 15 tooth as a tensioner for at least the prototype stage. later on you could swap it out for a bearing or a delrin grooved idler.