cvt without springs = 0 rpm engage?

[hacksign23]

As title says,
If I have a comet torque converter and take out the springs, will it engage at 0 rpms? I'm considering this because I have an electrical motor so the clutch is somewhat pointless.

Thanks!
-hacksign23

 

[devino246]

As title says,
If I have a comet torque converter and take out the springs, will it engage at 0 rpms? I'm considering this because I have an electrical motor so the clutch is somewhat pointless.

Thanks!
-hacksign23

Not necessarily. It would still take some rpm to throw the weights out, although Im pretty sure the springs keep the weights oriented correctly.

 

[hacksign23]

I see. So do you think it's safe to have it without springs? Or should I just test it and see what happens? thanks.

 

[B man]

I see. So do you think it's safe to have it without springs? Or should I just test it and see what happens? thanks.

just leave them. theres no harm there.

 

[hacksign23]

well I would if it was that easy. I need to have my motor start at 0 rpms, not 2200 rpms. (it's electric!)

 

[Doc Sprocket]

Are you capable (equipped) to vary the motor's speed from 0-max RPM, or do you plan to use it in an ON/OFF capacity only?

 

[wall gator]

electric motor? no need for clutch,sprocket on motor and rear sprocket all you need.

 

[hacksign23]

yes, i can vary the motor's speed (motor control = pwm).
also, i'm using it because of the cvt qualities it has. if not, i would've just put it direct.

 

[r_chez_08]

If you have a tav2, 30 series or tav30 (all the same driver) you could possibly use a weak spring from a hardware shop to allow it to engage at much lower rpm.

 

[hacksign23]

i see. I'm not too familiar with these clutch things (as I make electric vehicles, not gas). Can you point me out to an online store that has these springs? Do they have to be Comet springs, or can it be any general type of spring (I just looked at mfgsupply.com, they only carry green springs) ? I just noticed that there were two types of clutch systems... what's the difference between comet 20 and comet 30 series?

Thanks guys! Sorry for the silly questions :|

 

[racerc2000]

why not just delete the springs and shoes all together. and weld it solid. youde get a TC with 0rpm engagement then.

or just buy a driven TC pulley and use a standard pulley as the driver.

 

[devino246]

why not just delete the springs and shoes all together. and weld it solid. youde get a TC with 0rpm engagement then.

or just buy a driven TC pulley and use a standard pulley as the driver.

The weights in the driver control engagement AND ratio variation. Eliminating the weights and welding the driver would result in a simple pulley.

 

[racerc2000]

If I remember correctly. the driver consists of a friction clutch and a spring to move the pulley.

if you weld the clutch half it will engage at 0rpm.

and as long as the driven pulley functions correctly it will still move the driver as normal.

the driver controls engagement. the driven controls the ratio.
due to the driver having the clutch it only contains a spring to put tension on the pulley and help it to return to the base position.

the springs that were mentioned are inside the clutch to control the engagement. not the pulley spread. pulley spread would be adjusted if possible on the driven pulley.

so thus locking the friction clutch into a direct drive cvt would be possible

 

[devino246]

If I remember correctly. the driver consists of a friction clutch and a spring to move the pulley.

if you weld the clutch half it will engage at 0rpm.

and as long as the driven pulley functions correctly it will still move the driver as normal.


the driver controls engagement. the driven controls the ratio.
due to the driver having the clutch it only contains a spring to put tension on the pulley and help it to return to the base position.

the springs that were mentioned are inside the clutch to control the engagement. not the pulley spread. pulley spread would be adjusted if possible on the driven pulley.

so thus locking the friction clutch into a direct drive cvt would be possible

Your remembering incorrectly. The driver controls both engagement and ratio. Centrifugal force pushes the weights in the driver out and brings the two halves of the driver together. As the halves get closer, the belts grips, or in other words, it engages. As engine RPM increases, the halves continue to move closer, forcing the belt to ride higher on the driver halves. As the driver essentially becomes a larger pulley, the belt is forced to ride lower in the driven, changing the ratio.