JPH11264421A - Adapter for rolling-bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate assembling and to apply preload to a rolling bearing by forming one of the outer or the internal circumferential face of an adapter into a tapered shape and by arranging a damper member between the outer and the internal circumferential faces. SOLUTION: A rotating device 10 is provided with a bearing 5 rotatably supporting a rotary shaft 1. The bearing 5 is constituted of a ring inner race 8 fitted around the rotary shaft 1, a ring outer race 7 opposed to the inner race 8, and a ball 12 rolling between the race way face of the inner race 8 and the race way face of the outer race 7. The outer circumferential face of the outer race 7 is a tapered face 7a contracted its diameter toward a spacer 4 side and an adapter 6 is brought in contact with the tapered face 7a in the radial direction. A housing 2 is brought in contact with the adapter 6 in the outside of the radial direction. The adapter 6 is formed of an outside sleeve 6a, an inside sleeve 6c, and a damper member 6b sandwiched between the outside sleeve 6a and the inside sleeve 6c. This constitution can apply preload to the bearing by a wedge action between the tapered face 7a of the outer race 7 in the bearing 5 and the tapered face of the damper member 6b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for rolling bearings incorporated in rotating devices such as motors and spindles for general household and industrial use, and applies preload, rattling prevention, bearing creep prevention, vibration damping / cutoff, and electric power. The present invention relates to an adapter for a rolling bearing provided with a damper member having electric insulating properties that contribute to preventing corrosion.

[0002]

2. Description of the Related Art Rolling bearings (hereinafter also referred to as "bearings")
Rotating devices such as motors and spindles are widely used from general household use to industrial use. Spindle motors for hard disk drives and VTR rotary drums, which require high rotational accuracy, or low-vibration / Various characteristics are required depending on the purpose of use, such as air conditioner fan motors and ventilation fan motors that require low noise.

[0003] Generally, a rolling bearing incorporated in a rotating device such as a motor or a spindle presses the side surface of an outer ring or an inner ring with a spacer or the like or directly with a spring or a screw for the purpose of enhancing bearing rigidity. With preload,
The fit between one of the outer diameter surface of the bearing outer ring and the inner diameter surface of the housing or the inner diameter surface of the bearing inner ring and the outer diameter surface of the shaft is a loose fit. At this time, there is no gap between the bearing outer ring and the rolling element and between the bearing inner ring and the rolling element due to the preload.
In the gap between the outer diameter surface of the bearing outer ring and the inner diameter surface of the housing or the inner diameter surface of the bearing inner ring and the outer diameter surface of the shaft, a minute gap is generated due to clearance fit, and play is generated in the radial direction. This backlash affects the rotation accuracy of the rotating device and causes vibration and noise. In addition, the formation of the gap causes bearing creep to occur easily, which is a factor of shortening the life of the device.

[0004] As a countermeasure to prevent backlash, a method of filling the gap portion with an adhesive and fixing the same, a spring is provided between the outer diameter surface of the bearing outer ring and the inner diameter surface of the housing or between the inner diameter surface of the bearing inner ring and the outer diameter surface of the shaft. In order to prevent bearing creep, rotation of the fixed inner or outer ring is suppressed by inserting or contacting a material with a relatively high friction coefficient such as rubber as a countermeasure against bearing creep. However, there are adverse effects such as an increase in the number of processing and assembling steps or an increase in the degree of difficulty of the work content, and the cost tends to be high.

When a rotating device such as a motor or a spindle is in an operating state, for example, the housing on the fixed side is subjected to vibration of a rotating part such as a bearing or a rotor via a preload spring and a spacer or directly. Propagates and generates vibration and noise.

In order to realize low vibration and low noise during operation of a rotating device such as a motor and a spindle, the whole housing or a part thereof is covered with a damper material, or an O-ring or the like is provided between the bearing and the housing. And measures such as using a squeeze film damper are taken. However, these countermeasures have disadvantages in that the size around the bearing is likely to be large, and at the same time, the number of processing and assembly steps involved is increased, leading to an increase in cost.

In recent years, there are many devices using an inverter-driven motor whose rotation speed can be easily changed. However, when the carrier frequency of the inverter is set to a high value, the shaft voltage of the motor becomes high and the rotor shaft becomes high. A potential difference is generated between the housing and the housing. Therefore, a potential difference occurs between the inner and outer rings of the bearing that supports the rotor shaft, and the number of cases in which electrolytic corrosion occurs on the inner and outer raceway surfaces or the rolling element rolling surfaces is increasing. As a countermeasure, there is a method of contacting the brush with the rotor shaft to eliminate the potential difference, the use of conductive grease,
In addition, a method such as winding the resin around the outer diameter surface or side surface of the outer ring or inner ring of the bearing to insulate it is used, but when the brush is brought into contact with the rotor shaft, abrasion powder is released as dust, and furthermore, However, conductive greases generally have problems such as the fact that conductive grease contains conductive particles so that the rotational noise of the bearing tends to be larger than that of ordinary grease. Have. Insulating the outer ring or inner ring of the bearing by wrapping resin around the outer diameter or side surface of the inner ring tends to be expensive in terms of cost, and if excessive stress is applied during assembly or operation, cracks and other damage may occur. There are adverse effects such as easy occurrence.

In order to solve such problems, the present invention is easy to assemble without reexamining the design of the motor, especially the housing and the periphery of the shaft, is easy to assemble, and applies a preload to the rolling bearing. Eliminates the gap between the outer ring outer diameter and the housing inner diameter or the gap between the bearing inner ring inner diameter and the shaft outer diameter to prevent backlash in the radial direction and prevent bearing creep from occurring inside the rotating device. Damping of the ring member
In order to provide an adapter for a rolling bearing, it is possible to prevent electric erosion by a damper member having electric insulation properties, which can be cut off, and furthermore, under conditions where electric corrosion occurs in the bearing. I have.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, an adapter for a rolling bearing according to the present invention is provided in a rotating device incorporating a rolling bearing, between an outer ring and a housing of a rolling bearing or between an inner ring and a shaft. A bearing adapter provided between the outer peripheral surface and the inner peripheral surface, wherein the adapter has a tapered shape, and a damper member is provided between the outer peripheral surface and the inner peripheral surface. It is characterized by being arranged.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS When the tapered ring member is inserted by pressing in the axial direction between the outer surface of the outer ring and the inner surface of the housing, or between the inner surface of the inner ring and the outer surface of the shaft, a wedge is formed. Due to the action, the bearing outer ring or bearing inner ring moves in the axial direction, and the bearing outer ring raceway surface and the rolling element rolling surface and the bearing inner ring raceway surface and the rolling element rolling surface contact at a certain contact angle, and preload is applied to the bearing. You. At the same time, the ring member is pressed in the axial direction, thereby eliminating a gap between the outer ring outer diameter surface and the housing inner diameter surface or the inner ring inner diameter surface and the shaft outer diameter surface of the rolling bearing, thereby preventing radial play. Becomes possible. Therefore, relative slippage between the outer ring outer diameter surface and the housing inner diameter surface or the inner ring inner diameter surface and the shaft outer diameter surface of the bearing is suppressed, and bearing creep can be prevented. Further, a damper member integrally formed as a main component of the ring member is formed of a material having an electric insulating property under a condition in which vibration generated from inside the rotating device is attenuated and cut off and electric corrosion occurs in the bearing. With the damper member provided, it is possible to prevent electrolytic corrosion.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a rolling bearing adapter according to an embodiment of the present invention. In the drawings, the same parts are denoted by the same reference numerals.

Further, in each embodiment, as an example of the rolling bearing, a deep groove ball bearing in which a non-contact type seal is provided on both sides is shown. However, the seal, the cage, the rolling elements, and the inner and outer rings constituting the bearing are shown. With respect to the above, it is needless to say that those having a conventionally known structure can be applied, and general rolling bearings in general are within the scope of the present invention.

(First Embodiment) FIG. 1 is an axial sectional view of a rotating device 10 incorporating a rolling bearing adapter 6 (hereinafter also referred to as an "adapter") according to a first embodiment of the present invention. The rotating device 10 includes a bearing 5 that rotatably supports the rotating shaft 1 (a shaft that does not rotate). The bearing 5 includes an annular inner ring 8 fitted to the rotating shaft 1, an annular outer ring 7 opposed to the inner ring 8, and a plurality of balls 12 rolling between the raceway surface of the inner ring 8 and the raceway surface of the outer ring 7. ing. The ball 12 is held by a retainer 11, and an annular seal 9 is fitted to both ends of the bearing 5 in the axial direction to seal the inside of the bearing from the outside. A lubricant such as grease is sealed in the bearing 5 in advance.

The inner ring 8 of the bearing 5 has one end in the axial direction abutting on the step portion 1b of the rotary shaft 1 and the other end abutting on the spacer 4 fitted on the rotary shaft 1, and the axial direction of the bearing 4 by the spacer 4. The pressing force is given.

The outer peripheral surface of the outer race 7 is a tapered surface 7a whose diameter decreases toward the spacer 4, and the adapter 6 is in contact with the tapered surface 7a in the radial direction. The housing 2 is in contact with the adapter 6 further outside in the radial direction. Since the adapter 6 is pressed in the axial direction by the spacer 3, the outer ring 7 is pressed in the axial direction via the adapter 6.

The shapes of the spacers 3 and 4 and the pressing method (screw, spring, etc.) are not limited to the present embodiment.

FIG. 2 is a longitudinal projection view of the rolling bearing adapter 6 shown in FIG. The adapter 6 includes an outer sleeve 6a, an inner sleeve 6c, and a damper member 6b sandwiched between the outer sleeve 6a and the inner sleeve 6c.

The outer sleeve 6a includes an annular sleeve portion 6d and an annular flange portion 6e formed integrally with the sleeve portion 6d and bent substantially inward from the sleeve portion 6d in the radial direction at a substantially right angle.

The annular damper member 6b is disposed inside the sleeve portion 6d, and the inner sleeve 6c is disposed thereon. A surface 6f of the damper member 6b in contact with the inner sleeve 6c is a tapered surface corresponding to the tapered surface 7a of the outer ring 7 of the bearing 5, and the diameter increases at the end on the spacer 3 side.
Reduce the diameter on the other side. Although the damper member 6b is provided over the entire circumference, a plurality of damper pieces may be provided in a predetermined number equally on the circumference.

It goes without saying that the ratio of the thickness of the outer sleeve 6a, the damper member 6b, and the inner sleeve 6c, the taper angle, and the like can be arbitrarily set. The material of the outer sleeve 6a is arbitrary as long as it can maintain the geometric shape of the adapter 6 by itself. For example, carbon steel, copper, aluminum, stainless steel, plastic, and the like can be mentioned, and are appropriately selected within the scope of the present invention.

The damper member 6b may be made of rubber or thermoplastic elastomer having predetermined elasticity and electrical insulation properties. For example, synthetic rubber such as acrylic rubber, nitrile rubber, silicon rubber, or urethane-based, ester-based,
An amide-based thermoplastic elastomer is exemplified, and is appropriately selected in the present invention.

The inner sleeve 6c may be made of the same material as the outer sleeve 6a. Alternatively, the damper member 6b may be configured to directly contact the tapered surface 7a of the outer ring 7 without providing the inner ring sleeve 6c itself.

Further, the outer diameter surface of the outer sleeve 6a that rubs against the inner diameter surface of the housing 2 and the inner diameter surface of the inner sleeve 6c that rubs against the tapered surface 7a of the outer ring 7 control wear resistance and sliding characteristics. For example, surface treatment such as plating and Teflon coating can be performed.

The above-described materials, shapes, and the like are applicable to other embodiments, and are merely an embodiment of the adapter 6.
It goes without saying that the present invention is not limited in any way.

FIG. 3 is a longitudinal projection view of a rolling bearing adapter showing a modification of the first embodiment. A sleeve portion 6d of an inner sleeve 6a of the adapter 6, a damper member 6b,
Each of the inner sleeves 6c is circumferentially divided by a slit. The damper member 6b includes a plurality of divided portions 15 and an annular portion 16 divided in the circumferential direction, and the annular portion 16 and the divided portion 15 are formed integrally. The inner sleeve 6c is completely divided and each is a separate member. However, the inner sleeve 6c may be integrally formed like the damper member 6b. Similarly, the damper member 6b is
It can also be completely divided as in c. The first embodiment shown in FIGS. 1 and 2 can be appropriately applied to the material of each member, the ratio of the thickness, the taper angle, and other configurations.

According to the first embodiment, a preload can be applied to the bearing by the wedge action of the tapered surface 7a of the outer race 7 of the bearing 5 and the tapered surface of the damper member 6b.

(Second Embodiment) FIG. 4 is an axial sectional view of a rotating device 20 incorporating an adapter according to a second embodiment of the present invention. In the second embodiment, the basic configuration is the same as that of the first embodiment, but the outer peripheral surface 7a of the outer race 7 of the bearing 5 is provided.
Is not formed as a tapered surface, and the taper shape of the adapter 26 is opposite to that of the first embodiment. Therefore, a tapered surface 2 a having a tapered shape complementary to a tapered surface of an adapter 26 described later is provided on the inner diameter surface of the housing 2.

FIG. 5 is a longitudinal projection view of the rolling bearing adapter 26 shown in FIG.

As shown in FIG. 5, the adapter 26 includes an outer sleeve 26a, an inner sleeve 26c, and an outer sleeve 2c.
6a and a damper member 26b sandwiched between the inner sleeve 26c.

The outer sleeve 26a is formed integrally with the annular flange 26e and the annular flange 26e.
An annular sleeve portion 26d is formed by bending the flange portion 26e so as to form an acute angle radially inward from the flange portion 26e.

The annular damper member 26b is disposed inside the sleeve portion 26d, and has an inner sleeve 26d thereon.
c is arranged. A surface 26f where the damper member 26b is in contact with the sleeve portion 26d of the outer sleeve 26a is a (complementary) taper surface corresponding to the taper surface 2a provided on the inner diameter of the housing 2, and is formed at the end on the spacer 3 side. The diameter increases and the diameter decreases on the other side. Although the damper member 26b is provided over the entire circumference, a plurality of damper pieces may be provided in a predetermined number equally on the circumference.

FIG. 6 is a longitudinal projection view of a rolling bearing adapter showing a modification of the second embodiment. The sleeve portion 26d, the damper member 26b, and the inner sleeve 26c of the inner sleeve 26a of the adapter 26 are each circumferentially divided by slits. The damper member 26b includes a plurality of divided portions 25 divided in the circumferential direction and an annular portion 27, and the annular portion 27 and the divided portion 25 are formed integrally. The inner sleeve 26c is completely divided and is a separate member, but may be integrally formed like the damper member 26b. Similarly, the damper member 26
b can also be completely divided like the inner sleeve 26c. The first embodiment shown in FIGS. 1 and 2 can be appropriately applied to the material of each member, the ratio of the thickness, the taper angle, and other configurations.

According to the second embodiment, the sleeve portion 26d of the adapter 26 and the tapered surface 26 of the damper member 26b are formed.
A preload can be applied to the bearing by the wedge action of f and the tapered surface 2a of the housing 2.

(Third Embodiment) FIG. 7 is an axial sectional view of a rotating device 30 incorporating an adapter according to a third embodiment of the present invention. In the third embodiment, the basic configuration is the same as in the first and second embodiments, and therefore, the description of that portion will be omitted. It differs from the first and second embodiments in that the adapter is disposed between the rotating shaft and the bearing inner ring.

The adapter 36 includes an outer sleeve 36a, an inner sleeve 36c, and a damper member 36b sandwiched between the outer sleeve 36a and the inner sleeve 36c.

The outer sleeve 36a includes an annular sleeve portion 36d and an annular flange portion 36e formed integrally with the sleeve portion 36d and bent at an acute angle radially inward from the sleeve portion 36d.

The annular damper member 36b is disposed inside the sleeve portion 36d, and the annular inner sleeve 36c is disposed thereon. A surface 36f where the damper member 36b contacts the outer sleeve 36a is a tapered surface corresponding to the tapered surface 8a of the inner ring 8 of the bearing 5, and the spacer 4
The diameter increases at the end on the side and decreases on the opposite side. Although the damper member 36b is provided over the entire circumference, a plurality of damper pieces may be provided in a predetermined number equally on the circumference. The outer ring 7 of the bearing 5 is pressed in the axial direction by the spacer 3 and is fixed to the housing 2.

According to the third embodiment, the adapter 36 having a tapered shape complementary to the tapered surface 8a of the inner ring 8 of the bearing 5 is provided.
The preload can be applied to the bearing by the wedge action of the sleeve portion 36d and the tapered surface 36f of the damper member 36b.

(Fourth Embodiment) FIG. 8 is an axial sectional view of a rotating device 40 incorporating an adapter according to a fourth embodiment of the present invention. In the fourth embodiment, since the basic configuration is the same as in the first and second embodiments, the description thereof will be omitted. It differs from the first and second embodiments in that the adapter is disposed between the rotating shaft and the bearing inner ring. In the fourth embodiment, the rotating shaft 41 into which the bearing 5 is fitted is different from the above-described embodiments, and the portion into which the bearing 5 is fitted is processed into a tapered shape, and an annular taper inclined to the spacer 4 side. Surface 41a
It has.

The adapter 46 comprises an outer sleeve 46a, an inner sleeve 46c, and a damper member 46b sandwiched between the outer sleeve 46a and the inner sleeve 46c.

The outer sleeve 46a is composed of an annular sleeve portion 46d and an annular flange portion 46e formed integrally with the sleeve portion 46d and bent at a substantially right angle radially inward from the sleeve portion 46d.

The annular damper member 46b is disposed inside the sleeve portion 46d, and the annular inner sleeve 46c is disposed thereon. A surface 46f where the damper member 46b is in contact with the inner sleeve 46c is a tapered surface complementary to the tapered surface 41a of the rotating shaft 41,
The diameter increases at the end on the side of the spacer 4 and decreases on the opposite side. Although the damper member 46b is provided over the entire circumference, a plurality of damper pieces may be provided in a predetermined number equally on the circumference. The outer ring 7 of the bearing 5 is pressed in the axial direction by the spacer 3 and is fixed to the housing 2.

According to the fourth embodiment, the bearing is preloaded by the wedge action of the tapered surface 46f of the damper member 46b and the inner sleeve 46c of the adapter 46 having a tapered shape complementary to the tapered surface 41a of the rotating shaft 41. Can be provided.

It is needless to say that modifications of the adapter shown in FIGS. 3 and 6 can be applied to the third and fourth embodiments.

[0045]

According to the adapter for a bearing of the present invention described above, the following effects can be obtained.

It is possible to easily assemble and apply a preload to the rolling bearing without reexamining the design of the periphery of the bearing of the rotating device such as the motor and the spindle.

Further, by eliminating a gap generated between the bearing and the housing or between the bearing and the shaft, it is possible to prevent backlash in the radial direction and to prevent occurrence of bearing creep.

Under the condition that vibration generated from the inside of the rotating device is attenuated and cut off by the damper member constituting the adapter, and the electrolytic corrosion occurs in the bearing, the electrolytic corrosion can be prevented only by the adapter by the damper member having electric insulation properties. It becomes possible.

[Brief description of the drawings]

FIG. 1 is an axial cross-sectional view of a rotating device incorporating a rolling bearing adapter according to a first embodiment of the present invention.

FIG. 2 is a longitudinal projection view of the rolling bearing adapter shown in FIG. 1;

FIG. 3 is a longitudinal projection view of a bearing adapter showing a modification of the first embodiment.

FIG. 4 is an axial sectional view of a rotating device incorporating an adapter according to a second embodiment of the present invention.

5 is a longitudinal projection view of the rolling bearing adapter shown in FIG. 4;

FIG. 6 is a longitudinal projection view of a rolling bearing adapter showing a modification of the second embodiment.

FIG. 7 is an axial sectional view of a rotating device incorporating an adapter according to a third embodiment of the present invention.

FIG. 8 is an axial sectional view of a rotating device incorporating an adapter according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1: rotating shaft 2: housing 3: bearing outer ring spacer 4: bearing inner ring spacer 5: rolling bearing 6, 26, 36, 46: adapter for rolling bearing

Claims (1)

[Claims] In a rotating device incorporating a rolling bearing,
An adapter for a bearing provided between an outer ring and a housing or between an inner ring and a shaft of a rolling bearing, wherein the adapter has one of an outer peripheral surface and an inner peripheral surface having a tapered shape. An adapter for a rolling bearing, wherein a damper member is disposed between the surface and the inner peripheral surface.