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13. Calculation of bearing pressures

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

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

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	Max. spec. Press. Kgf/mm2
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	Max. spec. Press. Kgf/mm2
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

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13. Calculation of bearing pressures

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