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Post by wannabebuilderuk on May 14, 2020 19:55:13 GMT -5
I thinking the other night and had an idea so was wondering what you guys think - if you were to use a compact differential (standard design no limited slip etc) would it be possible to use it like a clutch where the input to the diff is connected to the reduction gear output of the free power turbine, then one of the diff outputs goes to the drive chain/shaft and other has a large disk brake.
Initially all power goes to disk side when stationary and when you engage the brake to slow output 2 then output 1 on the drive side starts spinning due to how the diff works?
My main reason behind this is it uses common components and is mechanically simple so would keep the cost and maintenance down however one potential downside I can see is that eventually the brakes might stick to the disk if you do loads of hard starts i.e drag races but otherwise to me this seems like a viable option?
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Post by racket on May 14, 2020 20:22:48 GMT -5
Mmmm...........not quite sure what you're trying to achieve here .
Are you going to use the disc brake as a "slipping clutch" to allow the freepower to rotate whilst the vehicle is stationary so that the freepower is producing horsepower rather than just torque , then at takeoff the vehicle brakes are released and the discbrake firmly applied ?
A high stall speed auto torque convertor might be an easier proposition and has been considered previously as an option .
Cheers
John
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Post by wannabebuilderuk on May 15, 2020 5:12:05 GMT -5
Sort of yea, when stationary the power will flow to the rotating disk brake, but once the brake is engaged the core of the differential will divert the power from the brake side to the other side. Like how the dif is used in this power hammer www.anvilfire.com/power/jyh/jyh-port.jpgAs you can see in the above picture the motor is constantly spinning but the hammer doesn't rise until the brake on the left is engaged to transfer the power. Whilst you could just use a auto torque converter the setup and mounting of it isn't easy I'm guessing? Was just an idea I was thinking about as for some who doesn't want to spend a lot they could easily get a dif for free and since it's all self contained the mounting would be fairly easy too. I know I'm basically trying to reinvent the wheel but was just a thought anyway haha Ben |
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Post by racket on May 15, 2020 16:55:02 GMT -5
Hi Ben We run into problems when using a freepower turbine because it doesn't have a "running speed" like an electric motor , an unloaded freepower could rev to destruction , they're a different animal . A freepower turbine needs to have a load on it at all times to prevent overspeed , this is normally achieved by having the gearbox permanently engaged , no clutch required due to the torque convertor characteristics of a freepower turbine , it turns out twice the torque at stall as at max rpm , so for most applications a single gear ratio is all thats required . At idle gas producer power with ~5-7 psi P2 , the freepower turbine doesn't produce sufficient torque to get the vehicle moving , but an increase in throttle and it does , similar to an auto car transmission . Anders bike works this way www.youtube.com/watch?v=yD8YEGD6TW4 www.youtube.com/watch?v=g4c5by5LPxQ Cheers John |
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Post by wannabebuilderuk on May 16, 2020 16:28:58 GMT -5
So the engine is at idle and and the free power doesn't turn until you rev It Up?
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Post by racket on May 16, 2020 18:09:37 GMT -5
Yep, the freepower is always permanently engaged to the back wheel , so when moving the bike around with the engine not operating , the freepower turbine wheel will be spinning at ~14 times the bikes wheel . Its a very simple arrangement , check out the info here jetandturbineowners.proboards.com/thread/1260/turbine-torque , we can have the gas producer at full power whilst the bike is stationary with the brakes on hard , the freepower turbine wheel will be producing maximum torque , but no horsepower , horsepower is only produced once the freepower wheel starts turning Cheers John |
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Post by wannabebuilderuk on May 17, 2020 7:27:17 GMT -5
Interesting, I assumed that it was always spinning so the blades aren't just getting cooked sitting still. Then again stator turbine blades in a axial jet engine are fixed..
Thanks,
Ben
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Post by racket on May 17, 2020 16:49:02 GMT -5
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