- A device which supports weight of the vehicle and transfer it to wheel and permits its rolling as well as longitudinal motion.
- Axle box transmits longitudinal, lateral and vertical forces from wheel set to other parts of the suspension system
- Axle Box consists of housing with removable front cover, bearing plain(now obsolete) or roller, fixture support the suspension of vehicle, lubrication system, front and rear seal to prevent dust entry, earthing shunt to prevent current passing through rolling surface.
Types of Roller Bearing
- Cylindrical roller bearing- double-row, line contact, high dynamic radial capacity but rollers can resist axial forces partly. This requires regulation of length-diameter of the roller and its axial & radial clearance.