AERODYNAMIC NOISE SUPPRESSING STRUCTURE OF CURRENT COLLECTOR, LIFT ADJUSTER OF CURRENT COLLECTOR, LIFT CONTROLLER OF CURRENT COLLECTOR, AND KARMAN VORTEX REDUCING STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide an aerodynamic noise suppressing structure of a current collector, a lift adjuster of the current collector, a lift controller of the current collector, and a Karman vortex reducing structure, which lessen the strength of a Karman vortex to reduce aerodynamic sounds from a collector shoe, using a readily attachable and simple structure, and easily adjust and control a lift acting on the collector shoe.SOLUTION: When a collector shoe 7 moves in an A direction to cause a strong vertical vortex Ffrom delta wings 9a of a vertical vortex generating portion 9, cutouts 10a of a vertical vortex guide portion 10 guide the vertical vortex Fto the lower surface 7e of the collector shoe 7. As a result, a Karman vortex Fgenerated from a separation shearing layer on a lower side interferes with the vertical vortex Fguided by the vertical vortex guide portion 10. This interference action lessens the strength of the Karman vortex Fgenerated from the separation shearing layer on the lower side. This consequently prevents the growth of the Karman vortex Fgenerated from a separation shearing layer on an upper side to lessen the strength of the Karman vortex F, thereby suppresses the generation of aerodynamic sounds.