SPLITTING OF TAPER LOCK BUSHES 2

[ETS2012]

Hello,

Often I have observed that the taper lock bush are either split in on both sides(opposite) or only in one side.Attached images for your reference.

Kindly share some thoughts on the following:-
1) What is the actual necessity for providing a split( I understood was better fitment & tolerance).
2) Any standards for the bush selection.(API...etc)?
3) What would the advantage/disadvantage by providing split on both sides?

Thanks in advance.

 

[MikeHalloran]

The split is present so that the bush can be, initially, a loose fit on the shaft, and can be tightened against the shaft as the tapers are engaged, just as tight as a press fit.

There may be standards by now, but it's still a good idea to buy bush and sheave from the same manufacturer.

It may depend on the relative thickness of the bush. I.e., if the shaft bore is very near the max bore allowed for the bush, the bush is relatively flexible even if only one wall is slotted. If the shaft bore is small, so that the bush is quite thick, the bush is relatively rigid, unless the slot extends through one side and a fair portion of the other side.

I don't think it matters if the slot completely separates the bush into two pieces, except for maintaining the alignment of the half-holes that may exist.

Mike Halloran
Pembroke Pines, FL, USA

 

[geesamand]

If you split the bushing into two halves, you will incur assembled runout unless you can keep the end face of each half perfectly aligned to each other.

 

[tbuelna]

Extending the radial slot as far as practical either side of the bore helps provide a more conformal fit at both the ID and OD surfaces of the bushing. A good example of a taper bushing with numerous splits are the collets commonly used with machine tools.

 

[Dpowers]

there is a standard available for taper locks MPTA-B9i-2013. heres a link to it.

http://mpta.org/wp-content/uploads/2016/05/MPTA-B9i-2013-TL-Bushing-Standard.pdf