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US 5,280,208 AGranted

Composite bearing structure

AssigneeSumitomo Electric Industries, Ltd.

InventorsOsamu Komura, Kenji Matsunuma, Norio Yasuoka, Matsuo Higuchi, Masaya Miyake, Tetsuya Katayama, Akira Yamakawa

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Abstract

A composite bearing structure can withstand high speed rotation has first, second and third bearing components. The first bearing component supports a radial impact force applied to a rotator during rotation, and is made of an inner ring (1) and an outer ring (2) of silicon nitride ceramic sintered bodies. The second bearing component supports an axial load applied to the rotator while maintaining a required clearance between itself and the rotator and is made of two permanent magnets (12, 13) positioned thrustdirectionally opposite to each other. The third bearing component maintains a radial rotational accuracy of the rotator, and is made of a radial dynamic pressure producing groove (5) provided on a cylindrical surface of the inner ring (1).

Claims41

Dependent claims

Claim 1A composite bearing structure for supporting a rotator carrying a load for rotating at a high speed · 171 words4 dependent Claim 6A composite bearing structure for supporting a rotator carrying a load for rotating at a high speed · 257 words4 dependent Claim 11A composite bearing structure for supporting a rotator carrying a load for rotating at a high speed · 214 words4 dependent Claim 16A composite bearing structure for supporting a rotator carrying a load for rotating at a high speed · 163 words2 dependent Claim 19A composite bearing structure for supporting a rotator carrying a load for rotating at a high speed · 167 words4 dependent Claim 24A composite bearing structure for supporting a rotator carrying a load for rotating at a high speed · 256 words4 dependent Claim 29A composite bearing structure for supporting a rotator carrying a load for rotating at a high speed · 215 words4 dependent Claim 34A composite bearing structure for supporting a rotator carrying a load for rotating at a high speed · 168 words2 dependent Claim 37A composite bearing structure for supporting a rotator carrying a required load for rotating at a high speed · 160 words4 dependent

A composite bearing structure for supporting a rotator carrying a load for rotating at a high speed, said composite bearing structure comprising:

first bearing means (1, 2) comprising a silicon nitride ceramic sintered body for supporting a radial impact force applied to said rotator during rotation, said silicon nitride ceramic sintered body containing silicon nitride crystal grains having a linear density of at lest 35 grains per 30 .mu.m length, a boundary phase volume ratio of not more than 15 percent by volume and pores having a maximum diameter of 20 .mu.m, said pores occupying 3 volume percent at the most, second dynamic gas pressure bearing means (6) for supporting by a gas pressure produced by rotation of said rotator an axial load applied to said rotator while maintaining an axial clearance between said second bearing means and said rotator;
and third dynamic gas pressure bearing means (1, 2) for maintaining a radial clearance and rotational accuracy of said rotator, said dynamic gas pressure being produced by rotation of said rotator.

A composite bearing structure for supporting a rotator carrying a load for rotating at a high speed, said composite bearing structure comprising:

first bearing means (1, 2) including a ceramic sintered body for supporting a radial impact force applied to said rotator during rotation;
second dynamic gas pressure bearing means (6) for supporting by a gas pressure produced by rotation of said rotator an axial load applied to said rotator while maintaining an axial clearance between said second bearing means and said rotator;
and third magnetic bearing means (7, 8, 9, 10;
8, 10, 11;
7, 8, 14, 15) for maintaining a radial clearance and a rotational accuracy of said rotator by magnetic attraction or repulsion while maintaining said radial clearance between said third bearing means and said rotator, wherein said third magnetic bearing means includes a rotating member (2) rotating with said rotator and a fixed member (1) positioned opposite to said rotating member while maintaining said radial clearance, and wherein said rotating member (2) and said fixed member (1) include magnets (7, 8, 9, 10, 11, 14, 15) for generating magnetic attraction or repulsion in said radial clearance, said rotating and fixed members comprising ceramic sintered bodies and magnets, wherein said ceramic sintered body of said rotating member is positioned opposed to said ceramic sintered body of said fixed member while radially maintaining a first radial clearance, and wherein said magnet of said rotating member is opposed to said magnet of said fixed member while radially maintaining a second clearance wider than said first clearance.

2 more elements

A composite bearing structure for supporting a rotator carrying a load for rotating at a high speed, said composite bearing structure comprising:

first bearing means (1, 2) including a ceramic sintered body for supporting a radial impact force applied to said rotator during rotation;
second dynamic gas pressure bearing means (6) for supporting by a gas pressure produced by rotation of said rotator an axial load applied to said rotator while maintaining an axial clearance between said second bearing means and said rotator;
and third magnetic bearing means (7, 8, 9, 10;
8, 10, 11;
7, 8, 14, 15) for maintaining a radial clearance and a rotational accuracy of said rotator by magnetic attraction or repulsion while maintaining said radial clearance between said third bearing means and said rotator, wherein said third magnetic bearing means includes a rotating member (2) rotating with said rotator and a fixed member (1) positioned opposite to said rotating member while maintaining said radial clearance, and wherein said rotating member (2) and said fixed member (1) include magnets (7, 8, 9, 10, 11, 14, 15) for generating magnetic attraction or repulsion in said radial clearance, and wherein said rotating and fixed members are formed by said ceramic sintered bodies, said magnets (11) being embedded in said ceramic sintered bodies.

2 more elements

A composite bearing structure for supporting a rotator carrying a load for rotating at a high speed, said composite bearing structure comprising:

first bearing means (1, 2) comprising a silicon nitride ceramic sintered body for supporting a radial impact force applied to said rotator during rotation, said silicon nitride ceramic sintered body containing silicon nitride crystal grains having a linear density of at least 35 grains per 30 .mu.m length, a boundary phase volume ratio of not more than 15 percent by volume, and pores having a maximum diameter of 20 .mu.m, said process occupying 3 volume percent at the most, second dynamic gas pressure bearing means (6) for supporting by a gas pressure produced by rotation of said rotator an axial load applied to said rotator while maintaining an axial clearance between said second bearing means and said rotator, and third bearing means (1, 2) including a ceramic sintered body for maintaining a radial clearance and a rotational accuracy of said rotator.

A composite bearing structure for supporting a rotator carrying a load for rotating at a high speed, said composite bearing structure comprising:

first bearing means (1, 2) comprising a silicon nitride ceramic sintered body for supporting a radial impact force applied to said rotator during rotation, said silicon nitride ceramic sintered body containing silicon nitride crystal grains having a linear density of at least 35 grains per 30 .mu.m length, a boundary phase volume ratio of not more than 15 percent by volume, and pores having a maximum diameter of 20 .mu.m, said process occupying 3 volume percent at the most, second magnetic bearing means (12, 13;
15, 16;
10, 17) for supporting by magnetic attraction or repulsion an axial load applied to said rotator while maintaining an axial clearance between magnetic bearing means and said rotator;
and third dynamic gas pressure bearing means (1, 2) for maintaining a radial clearance and a rotational accuracy of said rotator by gas pressure produced by rotation of said rotator.

1 more element

A composite bearing structure for supporting a rotator carrying a load for rotating at a high speed, said composite bearing structure comprising:

first bearing means (1, 2) including a ceramic sintered body for supporting a radial impact force being applied to said rotator during rotation;
second magnetic bearing means (12, 13;
15, 16;
10, 17) for supporting by magnetic attraction or repulsion an axial load applied to said rotator while maintaining an axial clearance between said second magnetic bearing means and said rotator;
third magnetic bearing means (7, 8, 9, 10;
8, 10, 11;
7, 8, 14, 15) for maintaining a radial clearance and a rotational accuracy of said rotator through magnetic attraction or repulsion while maintaining said radial clearance between said third magnetic bearing means and said rotator, wherein said third magnetic bearing means includes a rotating member (2) rotating with said rotator and a fixed member (1) opposed to said rotating member while maintaining said radial clearance, and wherein said rotating member (2) and said fixed member (1) include magnets (7, 8, 9, 10, 11, 14, 15) for generating magnetic attraction or repulsion in said radial clearance, and wherein said rotating and fixed members are formed by said ceramic sintered bodies and said magnets, said ceramic sintered body of said rotating member being opposed to said ceramic sintered body of said fixed member, while maintaining a first radial clearance, and wherein said rotating magnet member being opposed to said fixed magnet member while maintaining a second radial clearance wider than said first radial clearance.

4 more elements

A composite bearing structure for supporting a rotator carrying a load for rotating at a high speed, said composite bearing structure comprising:

first bearing means (1, 2) including a ceramic sintered body for supporting a radial impact force being applied to said rotator during rotation;
second magnetic bearing means (12, 13;
15, 16;
10, 17) for supporting by magnetic attraction or repulsion an axial load applied to said rotator while maintaining an axial clearance between said second magnetic bearing means and said rotator;
and third magnetic bearing means (7, 8, 9, 10;
8, 10, 11;
7, 8, 14, 15) for maintaining a radial clearance and a rotational accuracy of said rotator by a magnetic attraction or repulsion while maintaining said radial clearance between said third magnetic bearing means and said rotator, wherein said third magnetic bearing means includes a rotating member (2) rotating with said rotator and a fixed member (1) opposed to said rotating member while radially maintaining said radial clearance, wherein said rotating member (2) and said fixed member (1) include magnets (7, 8, 9, 10, 11, 14, 15) for generating magnetic attraction or repulsion in said radial clearance, and wherein said rotating and fixed members are formed by said ceramic sintered bodies, said magnets (11) being embedded in said ceramic sintered bodies.

4 more elements

A composite bearing structure for supporting a rotator carrying a load for rotating at a high speed, said composite bearing structure comprising:

first bearing means (1, 2) including a silicon nitride ceramic sintered body for supporting a radial impact force applied to said rotator during rotation, said silicon nitride ceramic sintered body containing crystal grains having a linear density of at least 35 grains per 30 .mu.length, a boundary phase volume ratio of not more than 15 percent by volume, and pores having a maximum diameter of 20 .mu.m, said pores occupying 3 volume percent at the most, second magnetic bearing means (12, 13;
15, 16;
10, 17) for supporting by magnetic attraction or repulsion an axial load applied to said rotator while maintaining an axial clearance between said second magnetic bearing means and said rotator;
and third being means (1, 2) including a ceramic sintered body for maintaining a radial rotational accuracy of said rotator, and a radial clearance between said third bearing means and said rotor.

1 more element

A composite bearing structure for supporting a rotator carrying a required load for rotating at a high speed, said composite bearing structure comprising:

first bearing means (1, 2) including a ceramic sintered body for supporting a radial impact force applied to said rotator during rotation;
second magnetic bearing means (12, 13;
15, 16;
10, 17) for supporting by magnetic attraction or repulsion an axial load applied to said rotator while maintaining an axial clearance between said magnetic bearing means and said rotator;
and third bearing means including a ceramic sintered body for maintaining a radial rotational accuracy of said rotator and for maintaining a radial clearance between said third bearing means and said rotator, and wherein said third bearing means including a rotating member rotating with said rotator and a fixed member opposed to said rotating member while maintaining said radial clearance and wherein said rotating and fixed members of said third bearing means are formed by ceramic sintered bodies.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/925,937Filed 5 Aug 1992
Priority: JP 3-20677119 Aug 1991
Granted: 18 Jan 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

F16C 39/063
Using magnetic means: permanent magnets
F16C 17/026
For radial load only: with helical grooves in the bearing surface to generate hydrodynamic pressure, e.g. herringbone grooves
F16C 17/045
For axial load only: with grooves in the bearing surface to generate hydrodynamic pressure, e.g. spiral groove thrust bearings
F16C 17/107
With grooves in the bearing surface to generate hydrodynamic pressure: with at least one surface for radial load and at least one surface for…

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