KS PERMAGLIDE® plain bearings Plain bearing mounting Press-in force and joint pressure

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 fits in the housing. Together with other factors, the joint pressure influences 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-fit
  • Coefficient of friction
  • Scoring
  • 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.

Fig. 1: Press-in force FE

Example of estimate of press-in force Ftotal

Given: Bush PAP 4030 P14
  Bush outside diameter DO = 44 mm
  Bush width B = 30 mm
  Bush wall thickness s3 = 2 mm
[ 14 ] Ftotal = FE · B = 340 N/mm · 30 mm = 10200 N



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Application examples

Take a look at our application examples with KS PERMAGLIDE® plain bearings