Bearing running surface metal
Speaking of which, it may reveal one of the bearing black technologies - high-end materials science, brother, did you know that people play with metal more slippery than other European countries combined. The elements on the periodic table, sorry, are mostly made by Swedish scientists.
Like this kind of high-speed bearing, it is not only the design that is more difficult to overcome, but the metal material. Inclusions of metal materials in bearing operation can easily lead to metal fatigue on the early subsurface. Therefore, the purity of domestic high-end steel is slightly different from that of imported products. However, the domestic truck bearings have basically been localized in steel, but the high-speed rail is not yet.
Special tapered roller bearing units have been developed for Chinese freight car bogies to meet Chinese railway standards. The bearing unit is fitted with labyrinth lip seals on both sides, as well as plastic steel spacers and plastic steel cages. These tapered roller bearing units (130 x230 x150) are interchangeable with other tapered roller bearing units used in China.
There is also a speed, 300 km / h, then the wheel end speed will reach 300 km / h, then we calculate the speed coefficient. Let's assume that the wheel end diameter is about 800mm.
3o0km/h=5000m/min=83m/s。
Then the angular velocity is about 207.5 radians /s, and the rotational speed is 3360 = 1980 RPM. (This is not yet the limiting speed).
Then the general high-speed rail bearing size is: 240 × 160 × 160 in the middle 130x.
Then the bearing dm value is, (130 + 240) / 2 = 185mm.
Then the bearing ndm value is about 366300.
