2. The rolling stability of the car body on the bogie is increased. At the same time, rigid rollers are used to limit the compression of elastic side bearings to prevent the car body from tilting too much when driving in curves. Once the upper bearing plate is pressed on the roller, not only the car body roll angle is limited, but also the turning resistance moment will not be increased due to the rolling of the roller, which will affect the curve passing performance.
Extended data:
The main functions of bogies are as follows:
1) Bogies are used in vehicles to increase the load, length and volume of vehicles and improve the running speed of trains to meet the needs of railway transportation development;
2) Ensure that the car body can sit on the bogie reliably under normal operating conditions, and the rolling of the wheels along the track is converted into the translation of the car body along the line through the bearing device;
3) Support the car body, bear and transmit various loads and forces from the car body to the wheels or wheel-rail to the car body, and evenly distribute the axle load.
4) Ensure the safe operation of the vehicle, be able to drive flexibly in a straight line and smoothly pass through the curve.
5) The structure of the bogie should be convenient for installing the spring damping device, so that it has good damping characteristics, so as to alleviate the interaction between the vehicle and the line, reduce vibration and impact, reduce dynamic stress, and improve the running stability and safety of the vehicle.
6) Make full use of the adhesion between wheels and rails, transmit traction and braking force, and amplify the braking force generated by the brake cylinder, so that the vehicle has good braking effect and can stop within the specified distance.
7) Bogies are independent parts of vehicles, and the number of connections between bogies and car bodies should be reduced as much as possible.
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