Title:
WORM-GEAR SPEED REDUCER
Document Type and Number:
WIPO Patent Application WO/2024/029440
Kind Code:
A1
Abstract:
[Problem] To provide a worm-gear speed reducer that readily manages, to a high degree, both the suppression of the occurrence of abnormal noise when torque has been input in reverse, and the ensuring of torque transmission efficiency during normal operation. [Solution] The present invention comprises a flat torsion spring 6 that urges an inner-diameter-side member 5 toward a worm-wheel 3 side. The flat torsion spring 6: is disposed, within the intervening area between the outer peripheral surface of the inner-diameter-side member 5 and the inner peripheral surface of the outer-diameter-side member 9, to the side farther from the worm wheel 3 with regard to the direction of urging by the flat torsion spring 6; has a load point P that is a part in contact with the outer peripheral surface of the inner-diameter-side member 5, and a fulcrum S that, within the part in contact with the inner peripheral surface of the outer-diameter-side member 9, is a portion which is present in a position nearest to the load point P; and exhibits nonlinear spring characteristics of a kind in which the spring constant increases due to change in the position of the fulcrum S so as to approach the load point P as the amount of deflection with regard to a first direction increases.
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Inventors:
SEGAWA TORU (JP)
HONDA YASUSHI (JP)
HONDA YASUSHI (JP)
Application Number:
PCT/JP2023/027511
Publication Date:
February 08, 2024
Filing Date:
July 27, 2023
Export Citation:
Assignee:
NSK STEERING & CONTROL INC (JP)
International Classes:
F16H1/16; F16H55/24
Domestic Patent References:
| WO2021241135A1 | 2021-12-02 |
Foreign References:
| JP2018204661A | 2018-12-27 | |||
| JP2004034857A | 2004-02-05 | |||
| JP2020128803A | 2020-08-27 |
Attorney, Agent or Firm:
KIWA INTERNATIONAL (JP)
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