| 摘要 |
PROBLEM TO BE SOLVED: To reduce the thickness of a plate part so as to reduce the weight of a gear to be used for rolling stock, and to have the bending rigidity as same as the conventional one by forming a plate part with a wave. SOLUTION: A gear is formed of a rim part 1, a teeth part 2, a boss part 5 and plate parts 3, 4. The plate parts are formed with a wave so that the center of thickness of the plate part is periodically changed each other in both sides of a center surface 9 of a gear along the circumferential direction or the radial direction or both the directions, and the weight of a rolling stock can be reduced. A wave heightδ(mm) [=maximum(mm) of a distance from the center surface 9 of the thickness of the plate part] is set at 2.5-10% of a radial length L(mm) [=(1/2)×a value(mm), which is obtained by subtracting the outer diameter of the boss part from the inner diameter of the rim}. Weight of a vehicle is thereby reduced so as to save the energy and improve the comfortableness of riding.
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