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A bogie is a wheeled wagon or trolley. In mechanics terms, a bogie is a chassis or framework carrying wheels, attached to a vehicle. more...
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It can be fixed in place, as on a cargo truck, mounted on a swivel, as on a train carriage or locomotive, or sprung as in the suspension of a caterpillar tracked vehicle.
Railway
A bogie in the UK, or a wheel truck, or simply truck in the USA, is a structure underneath a train to which axles (and, hence, wheels) are attached through bearings.
Bogies serve a number of purposes:
To support the rail vehicle body;
To run stably on both straight and curved track;
Ensure ride comfort by absorbing vibration, and minimizing centrifugal forces when the train runs on curves at high speed;
Minimize generation of track irregularities and rail abrasion;
Usually two bogies are fitted to each carriage, wagon or locomotive, one at each end. An alternate configuration often used in articulated vehicles, which places the bogies under the connection between the carriages or wagons.
Most bogies have two axles as it is the simplest design, but some cars designed for extremely heavy loads have been built with up to five axles per bogie. Heavy-duty cars may have more than two bogies using span bolsters to equalize the load and connect the bogies to the cars.
Usually the train floor is at a level above the bogies, however, for a double decker train the floor of the car may be lower between bogies to increase interior space while staying within height restrictions.
Key components of a bogie include:
The bogie frame itself.;
Suspension to absorb shocks between the bogie frame and the rail vehicle body. Common types are coil springs, or rubber airbags.;
At least two wheelsets, each composed of an axle with a bearings and wheel at each end.;
Axle box suspension to absorb shocks between the axle bearings and the bogie frame. The axle box suspension usually consists of a spring between the bogie frame and axle bearings to permit up and down movement, and sliders to prevent lateral movement. A more modern design uses solid rubber springs.;
Brake equipment. Two main types are used: brake shoes that are pressed against the tread of the wheel, and disc brakes and pads.;
In powered vehicles, some form of transmission, usually an electrically powered traction motors or a hydraulically powered torque converter.;
The connections of the bogie with the rail vehicle allows a certain degree of rotational movement around a vertical axis pivot (bolster), with side bearers preventing excessive movement. More modern bolsterless bogie designs omit these features, instead taking advantage of the sideways movement of the suspension to permit rotational movement.
Read more at Wikipedia.org
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