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Post by Chris Cristini on Aug 24, 2016 12:07:06 GMT -5
Saab did this a long time ago lol there giving the credit to Nissan blasphemy no just kidding Saab VCWould it be beneficial for a 2T? |
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Post by FrankenMech on Aug 24, 2016 19:02:43 GMT -5
I just like the sound of any piston engine.
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Post by 190mech on Aug 24, 2016 19:49:45 GMT -5
The twin row radials make a harley sound like a lawnmower;  |
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Post by Chris Cristini on Aug 24, 2016 20:37:42 GMT -5
Its crazy how much power planes take to fly fast.
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Post by spaz12 on Aug 24, 2016 21:31:30 GMT -5
Another one with a snowmobile engine
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Post by aeroxbud on Aug 25, 2016 4:30:40 GMT -5
The Tul aris gets my vote spaz12 |
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Post by spaz12 on Aug 25, 2016 11:11:04 GMT -5
The Tul aris gets my vote spaz12 It's always so funny when a 4 stroke guy hops on a 2 stroke and then describes his experience.... It's like, DUH, we been tryin to tell you! |
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Post by FrankenMech on Aug 25, 2016 16:24:14 GMT -5
My first ride was a 125-175? 2T along with a 300' long wheelie. I killed it the first time I let out the clutch, the 'ride' came when I gave it more, ah, -gas. The 300' ride back to where I started was uneventful. I did NOT have to clean my shorts.
My next ride was a passenger on a trike with a Porshe engine, wheelies at 130MPH were disturbing. The next was driving a full dress Harley KU police bike running some errands all over lawrence KS. My next ride was on a China 50cc 4t trike. Lets just say my latest impressions have not been overwhelming.
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Post by Chris Cristini on Aug 25, 2016 18:02:26 GMT -5
Here is another Idea A CVT that uses no Belt still trying to figure it out but basically It is a planetary Gear box if you allow the ring gear to rotate the wheel will not turn if you start slowing the rotation of the ring gear the wheel will start to turn and if you stop the ring gear you will get the max ratio of the Gearbox If the ring gear gets rotated in the opposite direction than taller ratios can be achieved. The animation did not process correctly hope you can see the ratio from Input to Output Change.   |
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Post by 190mech on Aug 25, 2016 18:39:48 GMT -5
Need some more edumacation on that design!Looks like Gilmer(cog)belt drive,just a cog pulley on crank??How does it change drive ratios?   |
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Post by thephranc on Aug 25, 2016 18:55:25 GMT -5
43 horsepower? Wow! Hurry up and figure out how to transplant one into our scoots. Don't tempt me. |
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Post by FrankenMech on Aug 26, 2016 2:57:38 GMT -5
Need some more edumacation on that design!Looks like Gilmer(cog)belt drive,just a cog pulley on crank??How does it change drive ratios? Watch that video a few times. Varying the speed of that planetary gear ring gear with that extra shaft varies the ratio of the planetary gear system. A brake or control of some sort on that extra shaft is needed to control the ratio. An automatic transmission uses a band and a servo to stop and start the motion of the ring gear. An automatic transmission normally uses an ON/OFF function rather than allowing slip or motion. Some transmissions may be playing with that ring gear speed nowadays. I am not up on the new transmission setups. I would think if they had figured out some practical way to control that ring gear speed we would not need heavy 11 gear transmissions with piles of clutches and gears. Maybe a simple DC motor or stepper motor could drive or hold that ring gear control shaft on a low power scoot? Someone really good at things could experiment with a planetary gearset out of an auto transmission, a PM DC motor, drive electronics for control (and electrical energy recovery), with an arduino...  |
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Post by Chris Cristini on Aug 26, 2016 7:36:27 GMT -5
Unfortunately this is still the tech of choice for today's transmissions. But it might be what could be used for this application to.  I thought of the motor control for the extra shaft but would it be to Complicated? Sorry John I designed this away from home at families house didn't have Much time to explain It might be the indestructible Transmission we all want  |
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Post by FrankenMech on Aug 26, 2016 19:33:44 GMT -5
That band-servo design is really old tech but it is still in use today. Using friction slip with that band setup would build heat quickly which is wasted energy. The gear ratio control would have to come from some sort of stepper motor or a PM DC motor for speed control and maybe regenerative braking. With control of the ring gear a clutch would not be required either. The ring gear could be allowed to spin freely with no output shaft rotation. Overdrive would also be available but I have not looked at the energy requirements for that. The ring gear motor control function would have to come from a computer with inputs for throttle position and engine RPM, not real complicated.
Just thinking out loud here:
Most transmission ring gears I am familiar with have a smooth exterior surface. I suppose some sort of timing belt pulley could be bored out and pressed over it. I am not sure about finding a large gear to machine out. The gear drive would be noisy. The timing belt would have to be protected from the grease inside the planetary gear. Maybe a #25 chain drive to the control motor, again with noise, but bike chain sprockets are widely available. A chain would not have a problem with grease. Grease could cause problems for the output timing belt but then a #35 drive chain would work there for scoots. If any chain breaks use a larger chain. Chain sprockets in most any size are readily available. Hmmmm, I think a chain drive might be appropriate...
'Silent' chain like the kind used for OEM engine cam drives on old engines is available. It is probably much more expensive to find parts and chain to experiment with.
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Post by Chris Cristini on Aug 26, 2016 20:50:07 GMT -5
That band-servo design is really old tech but it is still in use today. Using friction slip with that band setup would build heat quickly which is wasted energy. The gear ratio control would have to come from some sort of stepper motor or a PM DC motor for speed control and maybe regenerative braking. With control of the ring gear a clutch would not be required either. The ring gear could be allowed to spin freely with no output shaft rotation. Overdrive would also be available but I have not looked at the energy requirements for that. The ring gear motor control function would have to come from a computer with inputs for throttle position and engine RPM, not real complicated. Just thinking out loud here: Most transmission ring gears I am familiar with have a smooth exterior surface. I suppose some sort of timing belt pulley could be bored out and pressed over it. I am not sure about finding a large gear to machine out. The gear drive would be noisy. The timing belt would have to be protected from the grease inside the planetary gear. Maybe a #25 chain drive to the control motor, again with noise, but bike chain sprockets are widely available. A chain would not have a problem with grease. Grease could cause problems for the output timing belt but then a #35 drive chain would work there for scoots. If any chain breaks use a larger chain. Chain sprockets in most any size are readily available. Hmmmm, I think a chain drive might be appropriate... 'Silent' chain like the kind used for OEM engine cam drives on old engines is available. It is probably much more expensive to find parts and chain to experiment with. OK I will design something I think #35 chain would do just fine maybe a little loud but for a prototype who cares lol I am waiting for more parts for PCDI so I have time I am thinking a nice servo Motor with a bit of torque I hope because of the Ratio It will take a small motor to over come the engines power Regen/Overdrive would be completely programmable. |
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