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Title:
SEALING DEVICE AND REDUCTION GEAR
Document Type and Number:
WIPO Patent Application WO/2021/182057
Kind Code:
A1
Abstract:
This sealing device seals up a gap between a housing of a reduction gear and a rotary shaft which rotates bidirectionally, and separates an interior space of the housing where grease is stored from an atmospheric air side. The sealing device has a main seal lip that protrudes from an inner circumferential surface of an inner cylindrical part toward a radially inner side. The main seal lip comprises: an interior-side inclined surface disposed on the interior space side; and an atmospheric air-side inclined surface disposed on the atmospheric air side. An auxiliary seal lip is provided in such a manner as to protrude from the interior-side inclined surface of the main seal lip toward the radially-inner side and the interior space side. The atmospheric air-side inclined surface of the main seal lip and/or an inner circumferential surface of the auxiliary seal lip has formed thereon a plurality of first helical structures and a plurality of second helical structures.

Inventors:
ITO SAKI (JP)
Application Number:
PCT/JP2021/006076
Publication Date:
September 16, 2021
Filing Date:
February 18, 2021
Export Citation:
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Assignee:
NOK CORP (JP)
International Classes:
F16J15/18; F16J15/3232; F16J15/3244
Foreign References:
JP3188680U2014-01-30
JPH0530638U1993-04-23
JP2000110946A2000-04-18
Attorney, Agent or Firm:
KONISHI Kay et al. (JP)
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