This is the part of a rake which is just adjacent to the tracks. It basically consists of four main parts.
Wheel of a rake is a specifically made cylindrical portion having an outer edge shape to fit in the railway track. The material isstainless steel.
Axle is the main long cylindrical bar on which wheels are fixed with the help of bearings. This is also made of stainless steel as above. Each axle contains 2 wheels, the brake cylinders are also attached to it and in case of LHB coaches, the braking discs are fixed on to the axle
A taper roller cartridge type bearing is used and it makes up a preassembled unit. The axle bearings on the bogie are fitted with sensors for detecting speed (whose signal is elaborated by the anti slipping system) and a current return device.
The ends of the control arms are fitted with centering devices for the primary suspension spring assembly. The bearing lubricating plug is fitted in the lower part
The bogie frame is a solid welded frame made by steel sheets and forged or cast parts.
The frame is made up of two longitudinal components (1) connected by two cross-beams (2) which also support the brake units. The various supports which connect the different bogie components are welded to the frame. The bogie frame rests on the primary suspension spring units and supports the vehicle body by means of a bolster beam. The bolster beam is connected to the bogie frame by the secondary suspension.
Primary suspension is implemented by two units of two steel coil springs (internal (4) and external (5)) laid out on the control arm upper part (13) by a centering disk (8) and adjustment shims, (if required). The suspension is also completed by the following components:
