| 摘要 |
Along with an increase in speed of railroad vehicles, a wheel slip due to an air resistance and an air film caused when a wheel is rotated, a resistance due to air turbulence caused at the back of the wheel, and the like, which were negligible in the case of past middle-speed vehicles, become non-negligible factors, but all the factors are overcome if the vicinity of the wheel and a rail are approximately vacuated. A cover is put on the vicinity of the wheel and the rail entirely as much as possible, and a vent which is communicated with the inside of the cover is formed on a side thereof. With this structure, as the vehicle runs at higher speed, air inside the cover is sucked out of the cover in accordance with Bernoulli's theorem, and even in a part of the bottom of the wheel where the cover cannot be put, air is prevented from getting into the inside because of Bernoulli's theorem.
|
