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Strong Transmission

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screenshot of the scene

Author: s_noonan

Group: Technical

Filesize: 34.04 kB

Date added: 2018-02-26

Rating: 6.1

Downloads: 1557

Views: 493

Comments: 13

Ratings: 3

Times favored: 0

Made with: Algodoo v2.1.0

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This scene senses the output torque, multiplies it by the transmission ratio, and applies it to the brake of the input "gear". It then reads the angVel of the input gear, multiplies it by the transmission ratio, and applies it to hinge motorSpeed of the output "gear". So the input "gear" is actually a brake and the output "gear" is actually a motor, and they don't need to contact in order to work. From the point of view of the motor and wheels, the transmission looks and feels like a low slip CVT.

Rev A: Can now be used as a phunlet. In/out operation reversed with motorOn/motorOff (for using motor braking when coasting down hills).
Last edited at 2018/03/21 08:56:58 by s_noonan
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JakubKubo
2018/02/27 00:07:59
I don´t know why, but under any load, it is freaking out for me:/
Do it have same problem as >this↓<, by generating additional torque?
If not, how you fixed it?
Also, how is code with % working?
n%(2*math.pi) means fraction of full circle right (360°)?
s_noonan
2018/02/27 10:34:34
For me, the output fails at 50,000 N-m. At what load is it "freaking out" for you?
JakubKubo
2018/02/27 14:07:34
- Any N/m, any ratio, just when output torque is same/greater than input torque
For ex. Engine 5000N/m ratio 2:1 output torque 5000N/m, but torque should be 10.
000 (so it is not working like gearbox should)
-Looks too unstable to be used in engines because engines can not produce same torque in all time, and also when no torque is applied to this gearbox, it spins on its own
- I don´t know how to fix it...
P.s.: How did i made that arrow down symbol in link above??? )|( :bonk:
s_noonan
2018/02/28 01:08:25
↓ don't know what you are talking about. I added a few labels to show how it works.;)
Harris
2018/02/28 10:29:34
Hi noonan! Good to see you!:D
JakubKubo
2018/02/28 19:33:51
When you set "Motor" to 2000Nm "Brake" to 4000Nm at ratio 0.5 now,
it will turn ~3s, then stop for ~1s and repeat
(it stops while _sum is negative)
I didn´t look at how it works yet, so i used old +inf friction and +inf adhesion gearbox on my truck, which is also updated, now it use I4 combustion engine
(my first combustion engine that somehow works :lol: )
s_noonan
2018/03/01 10:12:06
Yes, I noticed that. The transmission works fine up until you get to a stall condition. Maybe you can fix that.

Ideally, the transmission would stop when the engine is stalled, but the slow stuttering of the transmission at stall could be considered an indication that you need to down shift.
Kilinich
2018/03/01 21:52:04
I could greately improve it:
1) increase inertiamultiplier to increase torque transmission
2) change density to keep mass of gear
s_noonan
2018/03/02 01:08:45
Then do it.
Kilinich
2018/03/02 20:18:11
naaah, I'm too lazy! =)
s_noonan
2018/03/02 20:37:37
OK. I appreciate your suggestion anyway, but I'm not sure it applies in this case. This scene senses the output torque, multiplies it by the transmission ratio, and applies it to the brake of the input "gear". It then reads the angVel of the input gear, multiplies it by the transmission ratio, and applies it to hinge motorSpeed of the output "gear". So the input "gear" is actually a brake and the output "gear" is actually a motor, and they don't need to contact in order to work. From the point of view of the motor and wheels, the transmission looks and feels like a low slip CVT.
Kilinich
2018/03/05 21:46:17
Oh, sorry, I didn't fully understand how it works. That's pretty cool :tup:
s_noonan
2018/03/05 22:21:17
Thanks for the comment and rating.