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    • 2. 发明专利
    • AC GENERATOR FOR ROLLING STOCK
    • JPS63240344A
    • 1988-10-06
    • JP7152987
    • 1987-03-27
    • HITACHI LTDHITACHI AUTOMOTIVE ENG
    • SATO OSAMUKAI KENJIRO
    • H02K5/10
    • PURPOSE:To improve environmental adaptability of a bearing section, by providing a designated seal section to the clearance between a bearing supporting section and a cooling fan mounting section. CONSTITUTION:An AC generator for a rolling stock is composed of a rotor 1 secured to a shaft 2, a bearing 3 to hold the shaft 2 and a bracket 5 through a bearing supporting section 4, a cooling fan 6, a stator 8 arranged to the bracket 5, etc. On this occasion, a seal section 9 of a labyrinth structure is provided. The cylinder section of a bearing supporting section 4 protrudes towards inside a generator. A recessed section is formed to the mounting section of the cooling fan 6 arranged adjacent to the cylinder section of the bearing supporting section 4 at a slight interval with a projected section of to the spot corresponding to the above-mentioned projected section. The seal section 9 of a labyrinth structure is composed of these recessed and projected sections. Mud water and dust from outside can thereby be prevented.