Specific Chain Rolling Friction Factors (f r)
Chain Rolling Friction: Rolling Friction of chain can be determined by formula:
f
r = Rolling friction of chain.
f r = Ad where A = Factor from below.
D
d
= Diameter of bushing, inches.
D
= Diameter of chain roller, inches.
| Type of Bearing For Chain Rollers | Factor A* | |
| Rollers Not Lubricated | Rollers Greased | |
| Cored iron or steel on cold finished steel** | .50 | .35 |
| Bored iron or steel on cold finished steel | .40 | .25 |
| Bored bronze bushing on cold finished steel | -- | .20 |
| Plastic bushed on cold finished steel | .25 | -- |
| Roller bearing with smooth hardened races | -- | .09 |
| Ball bearing with smooth hardened races | -- | .06 |
* - Based on rollers with smooth faces operating on smooth, clean steel tracks and
includes reasonable allowance for flange and hub frictions.
** - Based on smooth cored holes made with dry sand or painted cores.