Press-in force and joint pressure are interdependent. The joint pressure occurs between the housing bore and the surface of the bush jacket. It can be understood as a measure of how securely the bush its in the housing. Together with other factors, the joint pressure inluences the amount of press-in force.
Calculating the press-in force
The press-in force depends upon many factors, which are extremely difficult to measure accurately, for example:
- Actual press-it
- Coeicient of friction
- Press-in speed
Motorservice offers the calculation of the press-in force as a service. In most cases, the estimate of press-in force as per Fig. 1 is sufficient.
Determining the bush press-in force
Figure 1 below shows the maximum required press-in force per mm of bush width. The curves represent the bush outside diameter DO and the bush wall thickness s3 to DIN ISO 3547.
This calculation assumes a steel housing with a diameter of DG that has been adapted to the bush outside diameter DO. The selected ratio is DG: DO ≈ 1.5...2.
Example of estimate of press-in force Ftotal
PAP 4030 P14
Bush outside diameter
DO = 44 mm
B = 30 mm
Bush wall thickness
s3 = 2 mm
[ 14 ]
Ftotal = FE – B
= 340 N/mm – 30 mm = 10200
Take a look at our application examples with KS PERMAGLIDE® plain bearings