DRY SLIDING (PLAIN) BUSHES - PRESSURE VELOCITY:

PV (Pressure Velocity)

PV is the unit of measure determined by two factors; Pressure (PSI) and Velocity (SFM)

Formula: P = W/(dxb)

W = Static load on a single bearing

d = Bearing Inside diameter

b = Bearing length

calculating surface area

Imperial Example: 225lb load applied to a 1-inch diameter bearing x 2-1/4 inches long.

P = W/(dxb) so:

P= 225/(1" x 2.25") or P= 100 PSI and the velocity is 50 feet per minute

Then PV= 100(PSI) x 50 feet per minute

Answer: PV= 5000

Metric Example: 50kg (500N) load on a 25mm bearing x 58mm long

P = W/(dxb) so:

P= 500/(25 x 58) = 0.3448N/mm² and the velocity is 0.25m/s

Then PV= 0.3448 x 0.25

Answer: PV= 0.0862 N/mm² m/s