bearing force

[pippo82]

Hello everyone,
I would need if kindly someone gave confirmation to my idea, I briefly describe my problem: I have a biella of a 2t motor on the biella foot is mounted a bearing of sena rollers inside ring of the typenk 7/12tn the diameter of the housing hole of the bearing has a coupling n6 of diameter 14mm. I thought the bearing force is negligible with regard to the efforts on the foot of the biella.you think?
Thank you.

 

[cacciatorino]

Hello everyone,
I would need if kindly someone gave confirmation to my idea, I briefly describe my problem: I have a biella of a 2t motor on the biella foot is mounted a bearing of sena rollers inside ring of the typenk 7/12tn the diameter of the housing hole of the bearing has a coupling n6 of diameter 14mm. I thought the bearing force is negligible with regard to the efforts on the foot of the biella.you think?
Thank you.

It is not possible to answer without knowing the thickness of the two bushings. In fact, between the two bodies will establish an elastic balance due to the yield of both. You understand that if the foot of beauty is very thin, the force will be poor for poor dilation resistance. if both rings were very massive in relation to the diameter, the force would reach the theoretical maximum value.

 

[pippo82]

sorry perhaps I explained approximately: the fact is that by analyzing the biella on ansys for the fatigue duration has evidenced two critical points one on the connection point between stem and eyelet and one on the internal surface; the last point regarding the other is a non-balled area and therefore would be more critical than the other regarding fatigued life as the coefficent cs=0.9 while the one in the ball area has cs=1
I would kindly like to know: since on the inner hole it is not possible to perform a final ball treatment as it previews the bearing housing, is there a way to get equally cs=1?
the thickness of the eyelet is greater than the thickness of the bearing cage.
By making calculations with bearing data I get a force pressure around the 25 mpa this value gives me a lot to think about whether to evaluate or not forcing.

 

[stevie]

you can consider the stresses due to the force considering the pressure that will be exercised at the buffer-hole interface.
it is similar to a hydrostatic pressure that will give rise to radial stress and circumferential stress.

 

[thor105]

you can consider the stresses due to the force considering the pressure that will be exercised at the buffer-hole interface.
it is similar to a hydrostatic pressure that will give rise to radial stress and circumferential stress.

Also take into account that during operation, due to the temperature present inside the cylinder, the bearing will also tend to dilate a bit, therefore reducing its force and therefore also the consequent pressure that it will exercise will be less.

 

[cacciatorino]

Also take into account that during operation, due to the temperature present inside the cylinder, the bearing will also tend to dilate a bit, therefore reducing its force and therefore also the consequent pressure that it will exercise will be less.

It's not always said it's like this: It is true if the outer ring is thin, but if it is massive, the thermal expansion could be such that it reduces the inner diameter of the bushing. This should be evaluated by chance.