BALL SCREW DEVICE
    1.
    发明公开
    BALL SCREW DEVICE 审中-公开

    公开(公告)号:EP4317746A1

    公开(公告)日:2024-02-07

    申请号:EP22780958.9

    申请日:2022-03-29

    申请人: NSK Ltd.

    IPC分类号: F16H25/22 F16H25/24

    摘要: A ball screw device includes a screw shaft, a nut, and a plurality of balls. An outer peripheral raceway surface is provided on an outer peripheral surface of the screw shaft. The nut is provided with an inner peripheral raceway surface in an inner peripheral surface and penetrates the screw shaft. The nut has at least three or more circulation components. A raceway has at least three or more ball circuits respectively corresponding to the circulation components. The at least three or more ball circuits include a central circuit placed at a central portion of the nut in an axial direction parallel to a central axis of the screw shaft, a first circuit placed in the first direction with respect to the central circuit, and a second circuit placed in the second direction with respect to the central circuit. In the outer peripheral raceway surface, pitch diameters of the threads are the same. In the inner peripheral raceway surface, a first inner peripheral raceway surface that belongs to the first circuit and a second inner peripheral raceway surface that belongs to the second circuit have different pitch diameters from a central inner peripheral raceway surface that belongs to the central circuit.

    DOUBLE-ROW ANGULAR BALL BEARING
    2.
    发明公开
    DOUBLE-ROW ANGULAR BALL BEARING 审中-公开
    ZWEIREIHIGES RINGKONTAKT-KUGELLAGER

    公开(公告)号:EP2518357A1

    公开(公告)日:2012-10-31

    申请号:EP12735079.1

    申请日:2012-02-21

    申请人: NSK Ltd.

    IPC分类号: F16C33/78 F16C19/18 F16C33/80

    摘要: There is provided a double-row angular contact ball bearing superior in circularity of a bearing ring. The double-row angular contact ball bearing is provided with an inner ring (1), an outer ring (2), balls (3) in two rows, a cage (4) for holding the balls (3) in the respective rows between the inner ring (1) and the outer ring (2), and non-contact sealing devices 5 each being made of a substantially disc-like member. The sealing device (5) is made of a metallic material such as steel, and radial outer end portions (5a) are respectively fit and swaged into grooves (2b) arranged at both of the axial end portions of the inner circumferential surface of the outer ring (2). The ratio Ts/Tr is equal to or lower than 0.07, where Ts is thickness of the sealing device (5) and Tr is thickness of the outer ring (2) at the bottom portion of the groove (2b). In addition, the diameter of the ball (3) is equal to or greater than 75 % of a half a bearing width to equal to or greater than 83 % thereof. Furthermore, an axial width Tc of the radial outer end portion (5a) having a substantially letter U shape is equal to or smaller than 2.7 mm.

    摘要翻译: 提供了一种轴承环圆度较高的双列角接触球轴承。 双列角接触球轴承设置有内圈(1),外圈(2),两排球(3),保持架(4),用于将球(3)保持在各排之间 内环(1)和外环(2),以及非接触式密封装置5,每个均由大致圆盘状的构件制成。 密封装置(5)由诸如钢的金属材料制成,并且径向外端部(5a)分别装配并铆合到布置在外部的内周表面的两个轴向端部的两个凹槽 戒指(2)。 比率Ts / Tr等于或小于0.07,其中Ts是密封装置(5)的厚度,Tr是槽(2b)的底部处的外圈(2)的厚度。 此外,球(3)的直径等于或大于轴承宽度的一半的75%等于或大于其83%。 此外,具有大致U字形状的径向外端部(5a)的轴向宽度Tc等于或小于2.7mm。