• Patent Title: Single-cavity toroidal continuously variable transmission
  • Application No.: US15028065
    Application Date: 2014-04-02
  • Publication No.: US10247284B2
    Publication Date: 2019-04-02
  • Inventor: Hirotaka KishidaJunji Ono
  • Applicant: NSK LTD.
  • Applicant Address: JP Tokyo
  • Assignee: NSK LTD.
  • Current Assignee: NSK LTD.
  • Current Assignee Address: JP Tokyo
  • Agency: Sughrue Mion, PLLC
  • Priority: JP2013-212418 20131010
  • International Application: PCT/JP2014/059728 WO 20140402
  • International Announcement: WO2015/052950 WO 20150416
  • Main IPC: F16H15/38
  • IPC: F16H15/38 F16H61/664
Single-cavity toroidal continuously variable transmission
Abstract:
A single-cavity toroidal continuously variable transmission capable of suppressing gyro slippage and achieving mitigation of bearing loss and a longer service life. A pitch circle diameter (PCD) of the output-side bearing is smaller than that of the input-side bearing and a ball diameter of the output-side bearing is smaller than that of the input-side bearing. Therefore, centrifugal force acting on the ball of the output-side bearing on a speed increasing side with a low load can be suppressed. Therefore, gyro slippage can be suppressed and mitigation of bearing loss can be achieved. Furthermore, with a groove R ratio of the output-side bearing smaller than that of the input-side bearing, a longer service life can be achieved even when the pitch circle diameter (PCD) and ball diameter of the output-side bearing are smaller than those of the input-side bearing.
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