US 8,136,995 B2Granted

Sealing device and rolling bearing apparatus

AssigneeJtekt Corporation

InventorsKatsunori Otsuka, Takeshi Yamamoto

Life of this patent

Estimating the term…

Loading patent…

Abstract

First portions are fixed to an outer ring, and second portions are fixed to an inner ring. Bimetal members and electromagnets are embedded in and fixed by elastic portions of the first portions and portions of the second portions are constituted by ferromagnetic members. Whereas at a normal temperature region, the first portions and the second portions are brought into contact with each other, based on deformations of the bimetal members at a temperature equal to or higher than a predetermined temperature equal to or higher than the normal temperature region, the first portions and the second portions are made to be disposed to be spaced apart from each other by intervals therebetween at a temperature equal to or higher than the predetermined temperature equal to or higher than the normal temperature region.

Claims4

Dependent claims

A sealing device comprising:

a current supplied portion;
and
an interval adjusting portion for adjusting an interval between a first portion and a second portion by making the current supplied portion conductive or nonconductive
wherein an interval between the first portion and the second portion in making the current supplied portion conductive is larger than an interval between the first portion and the second portion in making the current supplied portion nonconductive,
wherein the interval adjusting portion includes a bimetal member constituted by bonding a first expansion member in a plate-like shape having a first thermal expansion coefficient and a second expansion member in a plate-like shape having a second thermal expansion coefficient different from the first thermal expansion coefficient and constituting a portion of at least one of the first portion and the second portion,
wherein the bimetal member is deformed to increase the interval between the first portion and the second portion when a temperature of the bimetal member is elevated, the sealing device further including:
a temperature measuring portion of measuring the temperature of the bimetal member, and
wherein a current supplied to the current supplied portion when the temperature measured by the temperature measuring portion is smaller than a predetermined temperature is larger than a current supplied to the current supplied portion when the temperature measured by the temperature measuring portion is equal to larger than the predetermined temperature.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/379,869Filed 3 Mar 2009
Priority: JP P2008-0534874 Mar 2008
Published: US 2009/0232433 A117 Sep 2009
Granted: 20 Mar 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

F16J 15/164
Between relatively-moving surfaces: the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
F16C 19/525
With devices affected by abnormal or undesired conditions: related to temperature and heat, e.g. insulation
F16C 33/78
Of ball or roller bearings: with a diaphragm, disc, or ring, with or without resilient members
F16J 15/3256
With rigid casings or supports: comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals