A PREVENTION-STRUCTURE OF A GEAR BOX SYMPATHETIC VIBRATION FOR A RAILROAD CAR

摘要

PURPOSE: A structure for preventing the resonance phenomenon of a gearbox in the trolley of a railroad car is provided to prevent the gearbox from cracking by setting the intrinsic vibration number of a member between 40 to 60 hertz of an exciting force frequency. CONSTITUTION: First, second and third plates in a specific shape are properly combined to be an upper and a lower box member. The upper and the lower box member are combined each other to be one gearbox. The first and the third plates are combined with flanges (4) to form flange attachment portions (4a). Especially, the third plates (3) are radially attached with reinforcement materials (5,6). Due to the reinforcement materials, the upper and the lower box of the gearbox are prevented from trembling to prevent a resonance phenomenon with reinforced intensity. In a first mode, the intrinsic vibration number of the gearbox is between 40 to 60 hertz and in a second and a third mode, the intrinsic vibration number is more than 100 hertz.