Do bearings need to be press fit?
A slight press fit will generally help prevent creep, but an excessive press fit will eliminate the bearing internal clearance and cause a rise in operating temperature that can lead to early failure.
How much does it cost to press a wheel bearing?
In either case, the cost of the bearing is usually between $25.00-50.00, whereas the labor to remove and press in a new bearing runs between 1-4 hours.
Why are bearings press fit?
To facilitate ease of installation and ensure adequate residual radial internal clearance, it is desirable to press fit only the ring most susceptible to rotation in its seat. Bearing load direction and magnitude determine which ring to be press fitted and how much interference is necessary to achieve retention.
What should be bearing clearance?
Generally speaking, bearing clearance should be 0.001-inch for every inch of journal diameter.
How tight should a bearing fit on a spindle?
They should not be so tight that you have to really pound on them to fit but they can require a little bit of effort to get them to slide onto the spindle. When installed there should be no play between the inner surface of the bearing and the spindle.
How do you fit a rotating bearing?
The resulting fit will be dependent on the tolerances of two points of contact – either the bearing bore and the shaft or the housing and bearing O.D. It will be unusual for a shaft and housing fit to be the same. One fit requires a clearance fit, the other, generally, the rotating ring, will require an interference fit.
Why do the bearings not stay on the shaft?
The bearings fit the shaft very tightly (they require a press or some skilled hammering to slide them on the shaft). The problem is that the bearings need to be pressed onto the shaft from opposite directions and there is nothing to hold the shaft in place while doing this.
How should a bearing bore and housing fit?
Either a clearance or interference fit may occur depending on the actual sizes of the bearing bore and shaft, or outer ring and housing. The resulting fit will be dependent on the tolerances of two points of contact – either the bearing bore and the shaft or the housing and bearing O.D. It will be unusual for a shaft and housing fit to be the same.
Why is it important to select the correct bearing?
Selecting the correct bearing fit will minimize failures. Correcting the fit can also be very difficult, depending on the application. Typically this will require an entire teardown to access both the shaft and housing. Fixing an issue like this in the field can be next to impossible.