公开(公告)号：US20150129348A1

公开(公告)日：2015-05-14

申请号：US14239893

申请日：2012-10-24

Applicant: NSK Ltd.

Inventor： Haruhiko Kiyota ,  Takeshi Yamamoto ,  Fumiaki Mitsuhashi ,  Kentaro Ogi

IPC: B62D5/04 ,  F16H55/06 ,  F16H55/22

CPC classification number: B62D5/0454 ,  B62D5/0409 ,  F16H55/06 ,  F16H55/22 ,  F16H2055/065 ,  Y10T74/19921

Abstract: Worm wheel construction that is able to sufficiently increase the strength of the connecting portion between a hub 11a and a gear portion 12a, and to maintain sufficient durability even when applied to an electric power steering apparatus that applies a large auxiliary torque, is achieved.A synthetic resin gear portion 12a is molded and formed in the end portion on the outer-diameter side of a metal hub 11a. A first annular concave portion 15 is provided on one surface side in the axial direction of the hub 11a, and a second annular concave portion 22 is provided on the other surface side in the axial direction thereof. Part of the synthetic resin of the gear portion 12a is fed into the portions near the outer diameter of the first annular concave portion 15 and the second annular concave portion 22 to form a first restraining portion 18 and a second restraining portion 23. These restraining portions 18, 23 tightly hold the end portion on the outer-diameter side of the hub 11a, and improve the strength and rigidity of the connecting portion between the hub 11a and the gear portion 12a.

Abstract translation: 能够充分提高轮毂11a和齿轮部12a之间的连接部的强度的蜗轮构造，并且即使在施加到施加大的辅助转矩的电动助力转向装置时也能够保持足够的耐久性。 合成树脂齿轮部分12a模制并形成在金属轮毂11a的外径侧的端部中。 第一环状凹部15设置在毂部11a的轴向的一个表面侧，并且在轴向的另一个表面侧设置有第二环状凹部22。 齿轮部12a的合成树脂的一部分被供给到第一环形凹部15和第二环状凹部22的外径附近的部分，形成第一限制部18和第二约束部23.这些限制部 紧固在轮毂11a的外径侧的端部，提高轮毂11a与齿轮部12a之间的连接部的强度和刚性。

公开(公告)号：US09707992B2

公开(公告)日：2017-07-18

申请号：US14239893

申请日：2012-10-24

Applicant: NSK Ltd.

Inventor： Haruhiko Kiyota ,  Takeshi Yamamoto ,  Fumiaki Mitsuhashi ,  Kentaro Ogi

IPC: B62D5/04 ,  F16H55/22 ,  F16H55/06

CPC classification number: B62D5/0454 ,  B62D5/0409 ,  F16H55/06 ,  F16H55/22 ,  F16H2055/065 ,  Y10T74/19921

Abstract: Worm wheel construction that is able to sufficiently increase the strength of the connecting portion between a hub 11a and a gear portion 12a, and to maintain sufficient durability even when applied to an electric power steering apparatus that applies a large auxiliary torque, is achieved.A synthetic resin gear portion 12a is molded and formed in the end portion on the outer-diameter side of a metal hub 11a. A first annular concave portion 15 is provided on one surface side in the axial direction of the hub 11a, and a second annular concave portion 22 is provided on the other surface side in the axial direction thereof. Part of the synthetic resin of the gear portion 12a is fed into the portions near the outer diameter of the first annular concave portion 15 and the second annular concave portion 22 to form a first restraining portion 18 and a second restraining portion 23. These restraining portions 18, 23 tightly hold the end portion on the outer-diameter side of the hub 11a, and improve the strength and rigidity of the connecting portion between the hub 11a and the gear portion 12a.