Help! with V belt sizing

   #1  

ArlyA

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Folks, I'm not a ME and don't play one on YouTube. :eek: I'm putting together a 35hp power drive and need it to be clutched. Since the engine could also use some load shock protection, I thought a few V belts attached right on the engine might work. Lets say 5" sheave on the output shaft but any size could be used, and 5" also on the secondary shaft. Of course an idler would be used and actuated, so as to give it a clutch. This would be operating at 3000rpm or nominal gas engine speeds and in cool temps, like below freezing. Bad or good idea?? And what size V-belt (more than one?) should be used? Thanks!
 

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PILOON

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It will work but also will wear over time.
Alignment will be critical and you'll also want some sort of guides the keep the belt/s in position.

What U describe is a fairly common procedure.

There also exists centrifugal clutches that accomplish the chore but at 35 hp ??? ($$)

I'd suggest looking at snowmobile clutching systems as they are in your HP range.
 
  
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ArlyA

ArlyA

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We do not want or need a CTV transmission like sleds have. Thanks

It will work but also will wear over time.
Alignment will be critical and you'll also want some sort of guides the keep the belt/s in position.
What U describe is a fairly common procedure.
There also exists centrifugal clutches that accomplish the chore but at 35 hp ??? ($$)
I'd suggest looking at snowmobile clutching systems as they are in your HP range.
 
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SPYDERLK

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Folks, I'm not a ME and don't play one on YouTube. :eek: I'm putting together a 35hp power drive and need it to be clutched. Since the engine could also use some load shock protection, I thought a few V belts attached right on the engine might work. Lets say 5" sheave on the output shaft but any size could be used, and 5" also on the secondary shaft. Of course an idler would be used and actuated, so as to give it a clutch. This would be operating at 3000rpm or nominal gas engine speeds and in cool temps, like below freezing. Bad or good idea?? And what size V-belt (more than one?) should be used? Thanks!
Clutching under no work load?

Are you starting a high inertia load and what rpm does the load run?

Are you able to start in a throttled down condition then go to working speed?​
 
  
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ArlyA

ArlyA

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Clutching under no work load?

Are you starting a high inertia load?

Are you able to start in a throttled down condition then go to working speed?​

Yes, the engine could be at idle or low speed, for engagement. And yes, the clutch would be engaged while not doing any work.

Not sure this is a high inertia load or not, maybe mid?
 
  
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ArlyA

ArlyA

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I'd guess we can get away with one or two C sized standard V belts and keep the tension on the low side for 'emergency clutching" action...

Or are we wiser to stay with just one belt, large enough to not routinely fail? I now see 9" is the minim diameter sheave for this size of belts....
 
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A pair of 5vx belts on a 5.5" or larger pulley will work fine
 

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Yes, the engine could be at idle or low speed, for engagement. And yes, the clutch would be engaged while not doing any work.

Not sure this is a high inertia load or not, maybe mid?
You dont offer any details of application and use. Is it a secret?
 

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Its a mini tiller, which is for snow.
That helps a little - altho I am not familiar. Things related to drive come to mind that may have specific influence based on options offered by the tiller. Do you have a link that better describes the equipment?
 
  
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ArlyA

ArlyA

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That helps a little - altho I am not familiar. Things related to drive come to mind that may have specific influence based on options offered by the tiller. Do you have a link that better describes the equipment?

Not many people outside of the very specialized XC or Alpine industry would. Here is a couple of videos that "barely" show them at work. The videos goal is to sell you the machine, not show you how a tiller works.

PRINOTH NORDIC LINER - YouTube

Snow Groomer Snow Rabbit 3 preparing winter road - YouTube
 

SPYDERLK

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Not many people outside of the very specialized XC or Alpine industry would. Here is a couple of videos that "barely" show them at work. The videos goal is to sell you the machine, not show you how a tiller works.

PRINOTH NORDIC LINER - YouTube

Snow Groomer Snow Rabbit 3 preparing winter road - YouTube
I see more than 35HP being used. What part of that composite is the "tiller"? Neither attachment appears to have an engine, but be hydraulically powered from the tracked vehicle.
 
  
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ArlyA

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A pair of 5vx belts on a 5.5" or larger pulley will work fine

As far as I can find on google, these belts require these slightly more narrow sheaves? copied below. Thanks!

--------------------------------------------------------

Narrow Wedge Sheaves - For 5VX, Belts
 

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a single A belt is used as a clutch/power for many 20 hp lawn tractors, and lasts quite long. a single BX or 5VX belt would be good for your 35 HP..
 

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a single A belt is used as a clutch/power for many 20 hp lawn tractors, and lasts quite long. a single BX or 5VX belt would be good for your 35 HP..

A single b or bx "sized" belt is used on many 25 hp zero turns. But they aren't a typical belt. Mower belts are different. Put a commercial grade B on a mower of 25 hp and they don't last.

Now we are talking an extra 10 hp.....

If it is actually gonna transmit 35 hp.....stick with the formulas. Pair of 5vx like I said earlier. And go a little bigger on the pullies
 

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My concern is that V belts would be susceptible to slippage due to wet as in snow.
Granted snow sleds use belts but generally the protected cab area.
 

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the Idler is on the wrong side, should be on the other side not the side that is pulling, but the side is Idling, check out a belt clutch lawn mower,

the other possibilities I think may work is a electric clutch, or even a centrifugal clutch, of course they would have to sized to the power produced,
hydraulic drive,
 
  
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ArlyA

ArlyA

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The idler will be on whatever side is not under tension. Snow blowers and 100's of other machine types do fine in snow will belt drives. I looked for an electric clutches with shaft sizes that would be appropriate for these 35hp-+ engines and couldn't find much. If you can locate one for a CH1000-2026 40hp Kohler Command Pro Horizontal Shaft Engine, please point it out. Nonetheless, my actuator clutch system can be assembled for $100 and rates as a KISS assembly in my book amateur ME.. A hydrostatic drive will lose in the area of 25% of the engines HP and force the tiller to be that much shorter, than I'd like to use. This is why we'd not consider that type of drive.

the Idler is on the wrong side, should be on the other side not the side that is pulling, but the side is Idling, check out a belt clutch lawn mower,
the other possibilities I think may work is a electric clutch, or even a centrifugal clutch, of course they would have to sized to the power produced,
hydraulic drive,
 
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ArlyA

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Let me add that B & S and Kohler seem to rate there small engines at gross HP, rather at nominal operating speed HP but a 1000cc twin V engine of some flavor seem to be the way we'd have to go. Thanks to all who can add something productive to this.
 
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ArlyA

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Here is a top view of the driver system and let me add, this should have about 6hp per foot, give or take.
 

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Seems that a chain gearbox will need to be built to the power from the jack shaft down to the tiller and its 1.5" shaft. I looked around the web for something I came up short. If anyone care to see that, I'll post prints as they are produced. Thanks for your help!!
 
 
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