13. Calculation of bearing pressures

    \[ a) Roller Loading=\frac{P}{L.Dr}\left[\frac{Kgf}{mm^2}\right] \]

    \[ b) Pin Pressure=\frac{T}{LDb.Dp}\left[\frac{Kgf}{mm^2}\right] \]

Where:
K = Load (Kgf) supported by each roller
P = Chain Pull
L = Distance through bore of Roller
LDb = Total bush length
Dr = Roller bore Diameter (mm)
Dp = Pin outside Diameter (mm)

Maximum Allowable pressures are shown in table 13.1 and 13.2

Maximum allowable pressures table 13.1

Materials in contact

Max. spec. Press.

Kgf/mm2

Bush

Pin

Case-hardened steel

Case-hardened steel

2.50

Case-hardened steel

Hardened-tempered steel

2.10

Cast iron

Case-hardened steel

1.75

Stainless steel

Stainless steel

1.20

Bronze

Case-hardened steel

1.00


Maximum allowable pressures table 13.2

Materials in contact

Max. spec. Press.

Kgf/mm2

Bush

Pin

Case-hardened steel

Case-hardened steel

1.00

Hardened-tempered steel

Case-hardened steel

1.00

Cast iron

Case-hardened steel

0.70

Bronze

Case-hardened steel

0.60

Polyethylene A.D.

Case-hardened steel

0.10

Stainless steel

Stainless steel

0.40

Cast iron

Bronze

0.28