SELF TENSIONING OF CHAIN Question
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Posted by: materialboy ®

04/01/2007, 18:12:20
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Hey Friends

I am designing a Hovercraft where I am using Standard Roller chains - ANSI/ ASME B29 and to over come the problem of self tensioning of chain, I decided to do a cut into stand and fix the MOVABLE SHAFT with tapered roller bearings and gears in align into front sprocket, where chain is rotated

Movable shaft moves up and down with tension and relaxation of chain making sure chain does not slip from the front sprocket.

I wanted to know is this the right approach of overcoming the tension in chain and stop the slipping of chain from front sprocket and if it is, how could the depth of cut to be made??


Diagram :
FRONT SPROCKET
/ (gear) \
Chain Chain
/ \
Engine Gear ------Chain------ Engine Gear
(Std chain)


Tripod Stand holding the Front Spocket, cut is made into the tripod stand close to the Front Sprocket and shaft along with taper roller bears are fixed into the cut.
Shaft is in align with the front sprocket and moves up and down as per the tension and realxation of chain

Any ADVICE gratly apprecated








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Re: SELF TENSIONING OF CHAIN
Re: SELF TENSIONING OF CHAIN -- materialboy Post Reply Top of thread Forum
Posted by: jboggs ®

04/02/2007, 18:33:00
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I saw your diagram. This is very basic, but make sure any tensioner is on the slack side of the path rather than the tension side. That is, make sure it is "downstream" of the driven pulley. It must not be between the driver pulley and the driven pulley. I also recommend that you find a good power transmission catalog, such as Dodge or Browning. Many of them have a good engineering section at the back.







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Re: SELF TENSIONING OF CHAIN
Re: SELF TENSIONING OF CHAIN -- materialboy Post Reply Top of thread Forum
Posted by: materialboy ®

04/01/2007, 18:16:21
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Diagram Arrangement

Front Gear at the top

Chain connecting Front Gear to Engine Gear

Engine Gear at the bottom

Any qeries please let me know







Modified by materialboy at Sun, Apr 01, 2007, 18:17:10


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Re: Re: SELF TENSIONING OF CHAIN
Re: Re: SELF TENSIONING OF CHAIN -- materialboy Post Reply Top of thread Forum
Posted by: randykimball ®
Barney
04/01/2007, 23:58:17
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I'm sorry, it is difficult to follow your discription. What is normally done is to allow the driven or driving shaft to be on moving bearing blocks. These blocks are then spring or hydraulicly loaded to maintain tention on the chain. Rollformers typically use bell spring washers to accomplish this function. A controlled hydraulic pressurised pair of small cylinders can do the same thing with the added improvement of allowing for controling the tention amount and providing plenty of travel to compenate for more chain growth. This is important on long runs of chain.




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Re: Re: Re: SELF TENSIONING OF CHAIN Smile
Re: Re: Re: SELF TENSIONING OF CHAIN -- randykimball Post Reply Top of thread Forum
Posted by: materialboy ®

04/02/2007, 07:08:34
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I apologize for my description,
I did try to post some pics but the pics allowed are in JPEG formant and I have them in Power Point format.

here is the which might get the general Idea-

https://commons.wikimedia.org/wiki/Image:Keilriemen-V-Belt.png

Instead of V-belt it is chain and chain passes from Front Sprocket - Engine Gears.

Self tensioning device is to be fitted close to Front Sprocket (top one in pic)
This device is prepared by cutting a slot in the Tripot stand and is used to keep the chain in tension - when elongates

I did try to understand your point and found it quiet fascinating, but if possible do u have any pics (or link) u can forward which can give me more bettter idea on using spring/ hydraulics

Thanks in advance
materialboy








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