Invention Grant
- Patent Title: Worm wheel and electric power steering apparatus
- Patent Title (中): 蜗轮和电动助力转向装置
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Application No.: US14387678Application Date: 2014-02-24
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Publication No.: US09550516B2Publication Date: 2017-01-24
- Inventor: Haruhiko Kiyota , Takeshi Yamamoto , Fumiaki Mitsuhashi
- Applicant: NSK LTD.
- Applicant Address: JP Tokyo
- Assignee: NSK LTD.
- Current Assignee: NSK LTD.
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2013-034912 20130225; JP2013-034913 20130225; JP2013-045857 20130307
- International Application: PCT/JP2014/054356 WO 20140224
- International Announcement: WO2014/129629 WO 20140828
- Main IPC: B62D5/04
- IPC: B62D5/04 ; F16H57/00 ; F16H55/06 ; F16H55/22

Abstract:
A core of a worm wheel has an axial end surface formed with a first annular recess and another axial end surface formed with a second annular recess. A rim portion has a first inner circumferential portion fixed to the first annular recess and a second inner circumferential portion fixed to the second annular recess. An outer circumferential wall surface of the second annular recess extends from a bottom surface of the second annular recess so as to be perpendicular to the bottom surface. A depth of the second annular recess is at least 0.1 mm but not deeper than half of a gate thickness.
Public/Granted literature
- US20150354687A1 WORM WHEEL AND ELECTRIC POWER STEERING APPARATUS Public/Granted day:2015-12-10
Information query
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