Quote:
Originally Posted by jt20
I'd have to agree with the hub expanding more than the spindle.. but the bearing is just as isolated from the hub as it is from the spindle. The rims 'suck' thermal energy away from the bearing instead of transferring it to the knuckle / spindle via the bearing.
If we are to imagine thermal expansion only in the linear sense, which is how we make the tolerance measurements, we can assume the same metal, despite volume, will expand at the same rate, correct?
|
I'm not really thinking about the rollers in the bearing expanding. They're so small the expansion isn't worth thinking about. The races, however, will expand enough to influence things and they are in intimate contact with either the hub or the spindle.
As far as the expansion... of course... it's dependent upon material, temperature, and linear dimension only. The volume only comes into play in transient conditions... when a greater mass will take longer to change temperature given the same heat input as to a lesser mass. Take a piece of steel 1 x 1 x 10 and a piece of steel 4 x 4 x 10 and put them in a hot oven at the same time. the 1 x 1 x 10 will expand faster than the 4 x 4 x 10, but they'll ultimately reach the same length.