JP2004092750A - Anti-friction bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve smooth rotation without deforming an outer ring by a sleeve. <P>SOLUTION: An anti-friction bearing 1A where a plurality of rolling bodies 4 are retained at a nearly equal interval in a circumferential direction between inner and outer rings 2, 3 by a retainer 5 has an insulated sleeve 6A that is fixed to at least one of the outer shape sections of the outer ring 3 and at least one plane section. The sleeve 6A is forced in and fixed while the tightening margin of inner diameter with an outer ring 6 is 0.15-1.0% of a bearing outer ring outer diameter. The anti-friction bearing 1A is fixed to the left/right sides of the outer ring 3 by a contacting section 6c and a nib-like section 6d. The contacting section 6c comes into contact with one end face 3c of the outer ring 3 on the inner end face. The nib-like section 6d is fixed to the other end face 3d of the outer ring 3 by pressing and fastening an elastic piece 6d-1 that is formed at three locations on a circumference in an axial direction. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing capable of preventing electric corrosion between a race and a rolling element due to an electrostatic phenomenon.
[0002]
[Prior art]
Conventionally, rolling bearings of this type are relatively small motors, such as motors for home appliances (fan motors, cleaner motors, washing machine motors), fan motors for clean rooms, motors for ventilation fans, and motors for water heaters. Used in motors with circuits.
In the above-mentioned application, there is a problem that a high-frequency current is generated from the inverter circuit, and this current flows through between the inner ring, the ball, and the outer ring in the bearing to generate electrolytic corrosion on the rolling surface (race surface). Was.
[0003]
As a countermeasure, for example, a rolling bearing capable of preventing electrolytic corrosion, in which a resin sleeve made of an insulating material is attached to the outer diameter of the outer ring, has been proposed (Japanese Utility Model Laid-Open No. 5-89953, Japanese Patent Laid-Open No. 6-229425).
[0004]
FIG. 5 is a sectional view showing a conventional rolling bearing capable of preventing electrolytic corrosion.
The rolling bearing 1B includes an inner ring 2, an outer ring 3, a rolling element (ball) 4, a retainer 5 for holding the rolling element 3, a sleeve 6B, and the like.
The outer ring 3 has two circumferential grooves 3a formed on the surface thereof, and is covered with an insulating resin sleeve 6B in which the circumferential grooves 3a are filled with resin to form ridges 6a. . Further, the outer ring 3 has grooves 3b formed on both side surfaces thereof, and a resin that becomes the sleeve 6B is filled into the grooves 3b to form the ridges 6b.
The sleeve 6B is integrally formed with the outer race 3 by insert molding. Therefore, the outer ring 3 exhibits excellent insulation performance and also has improved creep resistance due to the sleeve 6B.
Here, the creep of the bearing means that in the case of a rotating load of the outer ring, when there is a clearance between the fitting surface of the outer diameter surface of the bearing and the bearing seat of the housing, the inner surface of the fitting surface is relatively relative to the outer surface. It refers to the phenomenon of deviation.
[0005]
[Problems to be solved by the invention]
However, the above-mentioned conventional rolling bearing has the following problems.
(1) As the temperature of the sleeve 6 </ b> B decreases as the temperature of the resin decreases, the sleeve 6 </ b> B contracts and deforms when the crystal of the resin changes, so that an external force acts on the outer ring 3. As a result, the outer race 3 may be deformed, and smooth rotation may be hindered.
In particular, when the molding pressure is large, the deformation of the outer ring 3 becomes large, and the mounting state of the shield plate of the bearing may be loosened.
Further, the internal clearance of the bearing is reduced, and there is a possibility that a problem of wear or heat generation occurs in a short time.
[0006]
(2) Further, when the dimensional variation after resin molding becomes large, the sleeve 6B has a large clearance with the motor housing when attached to the motor, and the center position of the sleeve 6B is fixed by the bearing. Changes.
As a result, the clearance between the rotor and the stator may fluctuate, and electromagnetic noise may be generated in the motor.
[0007]
An object of the present invention is to provide a rolling bearing that enables smooth rotation without deformation of an outer ring and / or an inner ring by a sleeve.
Another object of the present invention is to provide a rolling bearing that does not cause a misalignment with a mounting portion (housing) of a device such as a motor when the device is mounted on a device to which a bearing is mounted.
[0008]
[Means for Solving the Problems]
In order to solve the above problem, the invention according to claim 1 is a rolling bearing in which a plurality of rolling elements are held at substantially equal intervals in a circumferential direction by a retainer between an inner ring and an outer ring. A rolling bearing, comprising a diameter portion, and an insulating sleeve fixed to at least one outer ring flat portion, wherein the inner diameter of the sleeve is fixed to the outer ring with the outer ring. is there.
[0009]
According to a second aspect of the present invention, in the rolling bearing according to the first aspect, the sleeve is deformed to a contact portion that abuts one side surface of the outer ring and the other side surface of the outer ring to deform on the circumference. A claw-shaped portion fixed by caulking at least at one position or over the entire circumference.
[0010]
According to a third aspect of the present invention, in the rolling bearing according to the first or second aspect, the sleeve has a circumferential groove formed in at least one portion of an outer periphery thereof, and is attached to the groove. A rolling bearing comprising an annular member having elasticity.
[0011]
According to a fourth aspect of the present invention, in the rolling bearing according to any one of the first to third aspects, a dimensional difference in a radial direction of the sleeve is 0.1 to 0.1 mm of an outer diameter of a bearing outer ring. A rolling bearing having a size of 3 or less.
[0012]
According to a fifth aspect of the present invention, in the rolling bearing according to any one of the first to fourth aspects, the sleeve has an outer diameter of 0.15 of an outer diameter of the bearing outer ring. A rolling bearing characterized by being in the range of ~ 1.00%.
[0013]
The invention according to claim 6 is a rolling bearing in which a plurality of rolling elements are held at substantially equal intervals in a circumferential direction by a retainer between an inner ring and an outer ring, wherein the inner ring inner diameter portion and at least one of the inner rings are provided. A rolling bearing, comprising a sleeve having an insulating property fixed to a plane portion, wherein the sleeve has an outer diameter fixed to the inner ring with a squeeze.
[0014]
According to a seventh aspect of the present invention, in the rolling bearing according to the sixth aspect, the sleeve is deformed on a contact portion that abuts on one side surface of the inner ring and on the other side surface of the inner ring so as to be formed on the circumference. A claw-shaped portion fixed by caulking at least at one position or over the entire circumference.
[0015]
According to an eighth aspect of the present invention, in the rolling bearing according to the sixth or seventh aspect, the sleeve has a circumferential groove formed in at least one portion of an inner periphery thereof, and is mounted in the groove. A rolling bearing comprising an annular member having elasticity.
[0016]
According to a ninth aspect of the present invention, in the rolling bearing according to any one of the sixth to eighth aspects, the sleeve has a radial dimension difference of 0.1 to 0.3 of the inner diameter of the bearing inner ring. A rolling bearing having the following size.
[0017]
According to a tenth aspect of the present invention, in the rolling bearing according to any one of the sixth to ninth aspects, the sleeve is configured such that a width of the sleeve is 0.15 to 1 of the inner diameter of the bearing inner ring. A rolling bearing characterized by being in the range of 0.000%.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings and the like.
FIG. 1 is a partial cross-sectional view illustrating an embodiment of a rolling bearing according to the present invention, FIG. 2 is a diagram illustrating a method of attaching a sleeve of the rolling bearing according to the present embodiment, and FIG. 3 is a side view illustrating the rolling bearing according to the present embodiment. FIG.
Note that the same reference numerals are given to portions that perform the same functions as those of the above-described conventional example, and redundant description will be omitted as appropriate.
The rolling bearing 1A of this embodiment is a ball bearing including an inner ring 2, an outer ring 3, a rolling element 4, a retainer 5, a sleeve 6A, and the like. The width of the inner ring 2 is larger than the width of the outer ring 3. It is large and satisfies ISO bearing external dimensions.
[0019]
The sleeve 6A is made of an insulating resin represented by polybutylene terephthalate (PBT) and polyphenylene sulfide (PPS).
In this embodiment, the sleeve 6A press-fits the outer ring 3 to the outer diameter of the bearing outer ring (φ28 mm in the case of the bearing 6002) with 0.15 to 1.0% of the outer diameter of the outer ring of the bearing. Have been.
By securing the above-mentioned squeezing, the rolling bearing 1A does not form a clearance fit at a temperature rise of 60 ° C. and does not cause creep in the sleeve 6A.
[0020]
The sleeve 6A is fixed on the left and right side surfaces of the outer race 3 by a contact portion 6c and a claw portion 6d.
The contact portion 6c is in contact with one end surface 3c of the outer race 3 at its inner end surface. The claw-shaped portion 6d is fixed to the other end surface 3d of the outer ring 3 by pressing and crimping the elastic pieces 6d-1 formed at three places on the circumference in the axial direction by the crimping jig 10. Have been.
[0021]
The sleeve 6A has two grooves 6e formed on the outer periphery thereof, and a ring (annular member) 7 made of rubber or elastic resin is inserted into the groove 6e.
When the rolling bearing 1A is attached to the housing 8 of the motor, the ring 7 is filled with an elastic material to fill a gap with the inner diameter of the housing 8 so that creep occurs between the ring 7 and the housing 8. Has been prevented.
Further, since the ring 7 can eliminate a clearance formed by a dimensional difference between the outer diameter of the sleeve 6A and the inner diameter of the housing 8 due to its elasticity, the position of the rolling bearing 1A in the housing 8 is hardly eccentric. Become. As a result, the displacement between the rotor and the stator of the motor is reduced, and the electromagnetic noise caused by the displacement is eliminated.
[0022]
FIG. 4 is a diagram illustrating a performance test (relation between sleeve dimensions and anderon value) of the rolling bearing according to the present embodiment.
In the rolling bearing 1A of this embodiment, as shown in FIG. 4A, when the outer diameter of the sleeve is D and the inner diameter of the sleeve is d, the sleeve 6A has the outer diameter φD and the inner diameter φd in the radial direction. The difference has a size of 0.1 to 0.3 times the outer diameter of the bearing outer ring.
[0023]
As shown in FIG. 4B, the shaft 21 was supported by another bearing 22, connected to a motor 24 via a joint 23, and a leakage current from the inverter 25 was passed through the bearing 1A of the present embodiment.
d / D of 0.02 times, 0.05 times, 0.1 times, 0.2 times, and 0.5 times of the outer diameter of the bearing outer ring were manufactured. The Anderon value after time rotation was measured using an Anderon device (acoustic measurement device). When n = 3, the increase in the Anderon value was less than 1, "O", and 1 or more. Tabulated as "X".
[0024]
As a result of visual observation, the results showed good agreement with the table shown in FIG. 4 (C). In a region where d / D was smaller than 0.1 times the outer diameter of the bearing outer ring, electrolytic corrosion occurred on the race surface (× When the mark (よ り 大 き い) was larger than that, no electrolytic corrosion was observed even after 3000 hours (○).
However, if it is larger than 0.3 times, the size of the internal bearing is reduced and the load capacity is reduced. Therefore, it is preferably 0.3 times or less.
[0025]
According to the present embodiment, the sleeve 6A fixed to the outer race 3 is not insert-molded to the outer race 3. That is, the sleeve 6A is formed in advance, and is subjected to dimensional stabilization processing such as baking, so that an excessive load for deforming the outer ring 3 after fixing to the outer ring 3 does not act.
As shown in FIG. 3, the sleeve 6A is caulked and fixed by the elasticity of the claw-shaped portion 6d of the sleeve 6A. Does not cause harmful deformation.
Further, since the sleeve 6A is provided with a ring 7 made of rubber at its outer diameter, the position of the outer ring 3 and the sleeve 6A with respect to the housing 8 is adjusted, and when the sleeve 6A is attached to the motor, the rotor 6 And the stator core misalignment is reduced, and generation of electromagnetic noise and the like can be suppressed.
[0026]
(Modified form)
Various modifications and changes are possible without being limited to the embodiment described above, and these are also within the equivalent scope of the present invention.
(1) The sleeve 6A may be heated when the claw-shaped portion 6d is crimped to secure the resin.
(2) The number of claw-shaped portions 6d for caulking is not limited to three, but may be at least one. Further, the entire circumference may be caulked over the entire circumference.
[0027]
(3) Although the example in which the sleeve is provided on the outer ring has been described, the sleeve may be provided on the inner ring in the case of an inner ring rotational load.
In this case, since it is for insulation, the configuration is the same as in the above embodiment. That is, the sleeve has a radial dimension difference of 0.1 to 0.3 of the inner diameter of the bearing inner ring, and the sleeve has an inner diameter of 0.15 to 1.00 of the inner diameter of the bearing inner ring. %.
(4) Although the example of the ball bearing has been described, the present invention can be similarly applied to a radial bearing other than the roller bearing. Further, the present invention can be applied to not only a radial bearing but also a thrust bearing.
[0028]
【The invention's effect】
As described above in detail, according to the present invention, the insulating sleeve is fixed to the outer ring and / or the inner ring with the squeezing, and the side surface with the bearing outer ring and / or the inner ring is fixed by caulking. Therefore, even if there is a temperature change, the applied bearing is fixed without deformation or creep.
[0029]
In addition, since the sleeve is attached to the housing or the shaft via an elastic ring, no creep is generated when the sleeve is fitted to the housing or the shaft, and no misalignment of the core is generated. This has the effect of suppressing the occurrence of blemishes.
[Brief description of the drawings]
FIG. 1 is a partial sectional view showing an embodiment of a rolling bearing according to the present invention.
FIG. 2 is a view showing a method of attaching a sleeve of the rolling bearing according to the embodiment.
FIG. 3 is a side view showing the rolling bearing according to the embodiment.
FIG. 4 is a diagram illustrating a performance test (relation between sleeve dimensions and anderon value) of the rolling bearing according to the present embodiment.
FIG. 5 is a cross-sectional view showing a conventional rolling bearing capable of preventing electrolytic corrosion.
[Explanation of symbols]
1A Rolling bearing 2 Inner ring 3 Outer ring 4 Rolling element (ball)
5 Cage 6A Insulating sleeve 7 Ring 8 Housing

Claims (10)

A rolling bearing in which a plurality of rolling elements are held at substantially equal intervals in a circumferential direction by a retainer between an inner ring and an outer ring,
The outer ring outer diameter portion, and comprises an insulating sleeve fixed to at least one outer ring flat portion,
A rolling bearing, wherein the sleeve has an inner diameter fixed to the outer ring with a squeeze. The rolling bearing according to claim 1,
The sleeve is
A contact portion that abuts one side surface of the outer ring,
A claw-shaped portion that is crimped and fixed on at least one location on the circumference or on the entire circumference by deforming the other side surface of the outer ring;
A rolling bearing comprising: In the rolling bearing according to claim 1 or 2,
The sleeve has a circumferential groove formed in at least one portion of its outer periphery,
A rolling bearing comprising an elastic annular member mounted in the groove. In the rolling bearing according to any one of claims 1 to 3,
A rolling bearing, wherein the sleeve has a radial dimension difference of 0.1 to 0.3 of an outer diameter of a bearing outer ring. In the rolling bearing according to any one of claims 1 to 4,
The rolling bearing, wherein the sleeve has an outer diameter of 0.15 to 1.00% of an outer diameter of the bearing outer ring. A rolling bearing in which a plurality of rolling elements are held at substantially equal intervals in a circumferential direction by a retainer between an inner ring and an outer ring,
The inner ring inner diameter portion, and, having an insulating sleeve fixed to at least one inner ring flat portion,
A rolling bearing, wherein the sleeve has an outer diameter fixed to the inner ring with a squeeze. The rolling bearing according to claim 6,
The sleeve is
A contact portion that abuts on one side surface of the inner ring,
A claw-shaped portion that is caulked and fixed to the other side surface of the inner ring over at least one location or the entire circumference by being deformed;
A rolling bearing comprising: In the rolling bearing according to claim 6 or 7,
The sleeve has a circumferential groove formed at least at one location on the inner circumference thereof,
A rolling bearing comprising an elastic annular member mounted in the groove. In the rolling bearing according to any one of claims 6 to 8,
A rolling bearing, wherein the sleeve has a dimensional difference in a radial direction of not less than 0.1 and not more than 0.3 of the inner diameter of the bearing inner ring. In the rolling bearing according to any one of claims 6 to 9,
The rolling bearing according to claim 1, wherein a width of the sleeve relative to the inner diameter of the inner ring is in a range of 0.15 to 1.00% of an inner diameter of the inner ring of the bearing.

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