SEAL DEVICE - NOK CORP

Title:

SEAL DEVICE

Document Type and Number:

WIPO Patent Application WO/2019/009053

Kind Code:

A1

Abstract:

The present invention prevents lubricating oil on a machine-interior side from seeping through and eventually leaking out of a gap between a flange part of a slinger and a main lip even at the time of high-speed rotation when the rotational speed of a rotation shaft is equal to or greater than a prescribed value. The present invention comprises: a slinger having a cylindrical part that is fitted to the outer circumferential surface of a rotation shaft that rotates with respect to a housing and an annular flange part that extends in a direction perpendicular to an axis of the rotation shaft from an inner end of the cylindrical part; and a seal part that is fitted to the housing and has a main lip that slidably contacts a flat outer side surface of the flange part of the slinger and seals lubricating oil on the machine-interior side of the housing. The present invention has a constrictive structure in which: a groove for exerting an excretory effect that causes lubricating oil to return to the machine-interior side of the housing at the time of rotation is formed in part of the outer side surface of the flange part that contacts the main lip; and a relative contact angle formed between the flange part and the main lip when the outer side surface of the flange part and the main lip contact each other is small.

Inventors:

YONAI HISATO (JP)
SAKANO YUYA (JP)

Application Number:

PCT/JP2018/023147

Publication Date:

January 10, 2019

Filing Date:

June 18, 2018

Export Citation:

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Assignee:

NOK CORP (JP)

International Classes:

F16J15/3232; F16J15/3244; F16J15/3252

Foreign References:

JP2016148386A	2016-08-18
JP2015194174A	2015-11-05
JP2002372059A	2002-12-26
JP2006342871A	2006-12-21
JP2009103142A	2009-05-14
JP2004125176A	2004-04-22
JP2014129837A	2014-07-10

Other References: