To provide a chain sprocket that can contribute to weight reduction while reducing stress concentration in an outer edge of a lightening hole.SOLUTION: A chain sprocket transmits a drive force of a drive source (12) for driving a vehicle (10), to a wheel (15). The chain sprocket is provided with a lightening hole (74 or 474) comprising an outer edge (81 or 481), an inner edge (82) shorter than the outer edge (81 or 481), and two side edges (83 and 483) connecting ends of the outer edge (81 or 481) and ends of the inner edge (82). The outer edge (81 or 481) is formed of arcs (81A, 81B, or 481B) having a plurality of curvature radii (R1, R2, or R401), or formed of a pair of arcs (81A, 81B, or 481B) having at least one curvature radius (R1, R2, or R401), and a line (481A) connecting the pair of arcs (81A, 81B, or 481B).SELECTED DRAWING: Figure 3

    【課題】肉抜き孔の外縁の応力集中を低減しながら軽量化にも貢献できるチェーンスプロケットを提供する。【解決手段】チェーンスプロケットは、車両(10)を駆動する駆動源(12)の駆動力を車輪(15)に伝達するチェーンスプロケットにおいて、チェーンスプロケットには、外縁(81、481)と外縁(81、481)よりも短い内縁(82)と外縁(81、481)の端と内縁(82)の端とを繋ぐ2本の側縁(83、483)とから成る肉抜き孔(74、474)が設けられ、外縁(81、481)は、複数の曲率半径(R1、R2、R401)の円弧(81A、81B、481B)により形成され又は少なくとも一つの曲率半径(R1、R2、R401)の一対の円弧(81A、81B、481B)と一対の円弧(81A、81B、481B)を繋ぐ線(481A)とから形成される。【選択図】図3


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    Title :

    CHAIN SPROCKET


    Additional title:

    チェーンスプロケット


    Contributors:

    Publication date :

    2025-04-10


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F16H Getriebe , GEARING / B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer



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