Is there a name for pulleys & belts with teeth?
- Thread starter 5 Horse Fan
- Start date
- Tags belts pulleys teeth?
HTD is one type. Gates makes what they dubed "8mm" because the "teeth" are half of an 8mm circle. They are, like chain sprockets and regular gears, made in a large number of "pitches" which is the number of teeth per inch. The HTD types have more or less square teeth. The pulleys are usually refered to as belt sprockets. What is the application? You planning on haveing the first belt drive mini? Any industrial bearing supply house will have all the info you will require.
I take it you mean to place one engine infront or the other. "V" belts will work. Useing 3L or A section belts the sheaves would have to be around 4 inches pitch diameter to handle the torque to be expected from the two engines. The slippage in the V belts will be an advantage not a problem. The toothed belts are not all that expevsive but the belt sprockets are really expensive. So unless you wish to spend a lot of extra loot use V belts. Stay away from chain for coupling the engines together. It will be nothing but trouble.
A litte searching might find better pics of a twin engine setup
The Thing - 1954 Twin Knucklehead Drag Bike - Cruiser Custom Builder - Motorcycle USA
The Thing - 1954 Twin Knucklehead Drag Bike - Cruiser Custom Builder - Motorcycle USA
Iron Horse
I'm not attempting to be uncivil. Honest. Just speaking from experiance redarding multi engine cycles. The first was many years ago when a friend and I decided to streach the frame on a early Royal Enfield 500 thumper and install a second engine. We used a HD 45 trans that only used 2nd and 3rd gears. Drag bike. [It was pretty slow for a full liter of displacement]. Clutch and chains turned out to be the problem. We solved it. Chains will work. The higher output the engine the more senseable it is to use chains. One problem would be that the cog belt would get rather wide as the torque went up. Agreed.
However if we are talking about a couple of Briggs motors the situation changes. The pictured triple engine mini originally had chains. I should have known better than to try. Could have make it work with a lot of trouble. The cure would be splined output shafts. Stock Briggs have a simple keyway. Splines will handle 'reversing' forces that will certinally be there. A simple key will handle reversing toruque only very poorly. Lock-Tite, Shaft-Tite, double and triple set screws...nothing would last more than minutes. I took everything off and threw it on the floor and used belts with perfect results. The slip and give of a V belt drive softens up the back and forth problem. Harley engines have splined output shafts. [A 41 Harley has a tapered output shaft but everything later carried splines].
I'm not attempting to be uncivil. Honest. Just speaking from experiance redarding multi engine cycles. The first was many years ago when a friend and I decided to streach the frame on a early Royal Enfield 500 thumper and install a second engine. We used a HD 45 trans that only used 2nd and 3rd gears. Drag bike. [It was pretty slow for a full liter of displacement]. Clutch and chains turned out to be the problem. We solved it. Chains will work. The higher output the engine the more senseable it is to use chains. One problem would be that the cog belt would get rather wide as the torque went up. Agreed.
However if we are talking about a couple of Briggs motors the situation changes. The pictured triple engine mini originally had chains. I should have known better than to try. Could have make it work with a lot of trouble. The cure would be splined output shafts. Stock Briggs have a simple keyway. Splines will handle 'reversing' forces that will certinally be there. A simple key will handle reversing toruque only very poorly. Lock-Tite, Shaft-Tite, double and triple set screws...nothing would last more than minutes. I took everything off and threw it on the floor and used belts with perfect results. The slip and give of a V belt drive softens up the back and forth problem. Harley engines have splined output shafts. [A 41 Harley has a tapered output shaft but everything later carried splines].
I didn`t mean to imply that you were being uncivil, I just want to masintain civility. I`ve seen nasty arguments over hot rodding theories.
You raise an interestring point about Harley switching from a tapered shaft to splines. The introduction of the splined shaft coincides with the introduction of the " Compensationg Sprocket" or " Compensator" in the vernacular. I`ve been running the idea around in the back of my mind about trying to build a torque compensatimg sprocket for mini-bike apps to smooth out drive train vibrations.
You raise an interestring point about Harley switching from a tapered shaft to splines. The introduction of the splined shaft coincides with the introduction of the " Compensationg Sprocket" or " Compensator" in the vernacular. I`ve been running the idea around in the back of my mind about trying to build a torque compensatimg sprocket for mini-bike apps to smooth out drive train vibrations.
Basically that was my concern. I was thinking a rubber belt might be better with all the pushing and pulling going on.
I would think that using a v-belt would require some good tensioners........
I would think that using a v-belt would require some good tensioners........
Have you decided on how to start the bad boy? Pull both ropes at once? That won't work too good unless you got a helper. But I suppose pulling just one rope will get the job done. I've never tried it. I cheated and mounted an electric starter.
Throttle cables can also become a pain but I know you can do that.
As a Briggs commonly blows its exhaust straight back the first engine will be blowing smoke on the second. I mounted some curved pipes to avoid that.
The minibike frame will be getting kinda long to accomodate the two engines and the jackshaft. I decided to use thin wall 1" X 2" rectangular tube as the bottom frame rails thinking that the usual material, 7/8" or 1" OD tube, would be too weak. Didn't do no 'finite element anaylisis' or any other high zoot stuff but I'm thinking you should look at that regidity issue.
Good Luck!