Title:
WORM SPEED REDUCER
Document Type and Number:
WIPO Patent Application WO/2019/017397
Kind Code:
A1
Abstract:
In this worm speed reducer (16), a bias member (22) is constituted from a bias shaft part (40) and an elastic pressing part (41). The bias shaft part (40) is rotatably disposed inside a housing (9) in a state in which the rotation center axis (O40) of the bias shaft part (40) is oriented substantially parallel to the central axis of a worm wheel. The elastic pressing part (41), which is made of an elastic material, is fitted onto and fixed to a portion, in the axial direction, of the bias shaft part (40) in an eccentric manner with respect to the rotation center axis (O40) of the bias shaft part (40). By rotating the bias shaft part (40), the outer circumferential surface of the elastic pressing part (41) is pressed against the outer circumferential surface of a second bearing (20) that is fitted onto a worm shaft (17). Thus, it is possible to achieve a structure for a worm speed reducer in which backlash is reduced while preventing an increase in the size of the housing.
Inventors:
FUJITA AKIHIDE (JP)
Application Number:
PCT/JP2018/026951
Publication Date:
January 24, 2019
Filing Date:
July 18, 2018
Export Citation:
Assignee:
NSK LTD (JP)
International Classes:
F16H1/16; B62D5/04; F16H55/24; H02K7/116
Domestic Patent References:
| WO2015169844A1 | 2015-11-12 | |||
| WO2012138051A1 | 2012-10-11 |
Foreign References:
| US20120227526A1 | 2012-09-13 | |||
| JP2010053910A | 2010-03-11 | |||
| JP2013155789A | 2013-08-15 | |||
| JP2017139586A | 2017-08-10 |
Other References:
See also references of EP 3657040A4
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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