Tham khảo tài liệu 'the design of rolling bearing mountings (fag bearing co) episode 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | z Axle box roller bearings 7 of the Channel tunnel s freight engine class 92 Class 92 is used for freight traffic in the Euro tunnel between Great Britain and the Continent. It is a two-system engine which means it can be operated on direct current 750 V as well as on alternating current 25 kV . The engine with six axles CoCo draws loads weighing up to 1 600 t. The vertical loads of the bogie are accommodated by two lateral coil springs on the housing of the axle box bearings. All lateral and longitudinal forces act via the guiding journals and sleeves which are attached to the bogie frame and the housing. The middle axle of each triple axle bogie is designed as a floating axle box to insure trouble-free operation in narrow curves. The two outer axles are designed as standard axles as customary. Operating data Vehicle weight 126 000 kg two bogies each with three axles wheel diameter 1 120 mm top speed vmax 140 km h Power P 5 000 kW at 25 kV AC 4 000 kW at 750 V DC Bearing selection Tapered roller bearing units TAROL 150 250 with pressed cages JP are mounted to the outer standard axles of the vehicles. The bearings are clearance-adjusted greased and sealed by the manufacturer. Fey lamellar rings provide for sealing on the side facing the wheel. A gap-type seal prevents rough dirt from penetrating the bearings. The floating axle is accommodated in two cylindrical roller bearings whose dimensions are 150 x 250 x 80 mm. The extended inner ring allows axial displacement within the bearing of 20 mm at a maximum. Sealing is achieved at the wheel end by means of long-webbed labyrinths. Machining tolerances The inner rings carry circumferential load and have a tight fit to p6 on the journal. The housing bores point load are machined according to H7. Bearing clearance Prior to mounting the TAROL units of the standard axle have an axial clearance of mm and the cylindrical roller bearing units a radial clearance to C4 in order to compensate for heat expansion. .
