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Antique Gas Engine Discussion

Something else I saw today


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  #1  
Old 04-24-2005, 09:51:16 PM
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Default Something else I saw today

At 1st glance I just thought it was a run of the mill pump jack with a ZC 118 engine on it. But LOOK at pully out there in MID-AIR! Look at that real close. You tell me how that is staying together! I looked closely! there is only 2 belts there. I thought at first there must be 3 belts,, 2 on the outter side and one in the middle. NOPE! Only 2 belts there. And yes that engine is running. Figure that one out!
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Old 04-24-2005, 09:57:48 PM
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Default Re: Something else I saw today

Here is a close up
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Old 04-24-2005, 10:01:29 PM
Rex Pyles Rex Pyles is offline
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Question Re: Something else I saw today

Magic
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  #4  
Old 04-24-2005, 10:30:11 PM
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Default Re: Something else I saw today

Huh,....well aint that somethin....never saw nuttin like that before!
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Old 04-24-2005, 10:47:11 PM
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Default Re: Something else I saw today

Yup.... If you would have posted a pic from the top you would have given the secret away.... Looks like they just couldn't find any belts long enough....
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Old 04-24-2005, 10:55:19 PM
Mac Leod Mac Leod is offline
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Default Re: Something else I saw today

if you look real close on the close up picture you can see a white line on the right side belt...and a black line above it, the second belt..that is why there is a bolt through the pully...to hold on the extra belt. Good picture- took a few minutes of looking to geyt wise to the trick...do you have a shot of the top view?

Mac Leod
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Old 04-24-2005, 11:38:19 PM
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Default Re: Something else I saw today

I blew that close-up up way large and it sure looks like three belts to me.
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Old 04-25-2005, 05:29:52 AM
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Default Re: Something else I saw today

I also see three belts...Mark Congden
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Old 04-25-2005, 07:01:41 AM
David Greenwalt David Greenwalt is offline
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Default Re: Something else I saw today

Well, to me if you look real close at the belt coming from the right side you can just see the second belt raised over the first one. It stops at the rim of the larger pulley. Just my observation, worth what it costs me to type it here. David.
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Old 04-25-2005, 08:43:49 AM
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Default Re: Something else I saw today

Quote:
Looks like they just couldn't find any belts long enough.
It appears to be close to a 3:1 speed reduction from the engine to the pump. Also a 3X torque increase, that is with the incoming pulley radius three times the outgoing pulley radius.
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Old 04-25-2005, 09:40:48 AM
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Default Re: Something else I saw today

I can see how the reduction would work IF the smaller pulley was BETWEEN two larger pullies.

It could also be that there are two small pulleys with the larg pulley between them but I can't see two belts going from the small pulley.

Sure need to see an "above" shot.

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Old 04-25-2005, 09:45:22 AM
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Exclamation Re: Something else I saw today

Just took another look. Two smaller pulleys sandwiching the larger one. I now see the second belt on the far side of the large pulley!

Neat arrangement! As long as both of the double belts are replaced at the same time to keep the lengths equal, it should work like a charm. Also avoids having to mount the reduction pulleys and lets you adjust the belt tension by moving only the engine.

I think the pulleys will move up and down depending on the load.

Take care - Elden
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Old 04-25-2005, 10:24:38 AM
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Thumbs up Re: Something else I saw today

Man! it didnt take you guys long I thought for sure someone would really go into detail how you can or CANT make 2 belts hold together like that. Yes there are 3 belts! And you cant believe how hard that was to get a picture trying not to show the "hidden" belt. But you have to admit, this is a pretty cool set up. And Harry your right, that is a speed reducer/ torque increaser. A little ZC 118 can power anything, its just all in how fast you want to go. Doug
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Old 04-25-2005, 11:34:53 AM
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Default Re: Something else I saw today

A closer look and PhotoShop reveals...
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Old 04-25-2005, 11:40:01 AM
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Default Re: Something else I saw today

It appears that the ratio between the engine and the larger pulley is about 1 to 1 by the way the belt looks. The same thing could have been done by just a smaller engine pulley. But this appears to be a case of using available materials....
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Last edited by Ken Majeski; 04-25-2005 at 11:51:04 AM. Reason: Take out extra letter
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Old 04-25-2005, 01:45:27 PM
John Davidson John Davidson is offline
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Default Re: Something else I saw today

Quote:
Originally Posted by Doug Waggonner
At 1st glance I just thought it was a run of the mill pump jack with a ZC 118 engine on it. But LOOK at pully out there in MID-AIR! Look at that real close. You tell me how that is staying together! I looked closely! there is only 2 belts there. I thought at first there must be 3 belts,, 2 on the outter side and one in the middle. NOPE! Only 2 belts there. And yes that engine is running. Figure that one out!
Doug, I think you need new glasses if you looked close and did not see the 3rd belt.
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Old 04-25-2005, 01:50:29 PM
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Default Re: Something else I saw today

"The same thing could have been done by just a smaller engine pulley."

Also this is mainly only a speed reducer as the torque increase has to be reacted against something and the only thing there is the belt to the engine.
Do to the geometry, that increase in torque results in a very great increase in tension in that belt, think of a fence wire and how little a force pushing 90 deg. to the wire can result in a very great tension in the wire. Under high loads the belt would brake long before it would if it were a more conventional counter shaft setup.
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Old 04-25-2005, 02:17:21 PM
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Default Re: Something else I saw today

Let's try that again.

"The same thing could have been done by just a smaller engine pulley."

The smaller pulley looks to be not much bigger then the crank shaft on the engine, so they would have had to turn a V groove into the engine shaft.

Also .....

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