JP2003161327A - Bearing unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily assemble a bearing unit in a housing without using such method as bonding, press-fitting, and screwing. <P>SOLUTION: An interlock bush 20 comprises a notch formed between end parts in an axial direction, not shown in the figure, a first alignment projection 22 engaged with a groove part 14a of a spacer 14 on the inner peripheral surface, and a second alignment projection 23b which is engaged with a groove part 15a of a housing 15 on the outer peripheral surface. The second alignment projection 23b is provided in a fringe 23 which is made to be of elastic structure by forming a gap with the outer peripheral surface of a radial ball bearing 12, with an insert ring 30 attached into the gap. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing unit used in a spindle motor for information equipment such as HDD (hard disk drive) and a spindle motor for audiovisual equipment such as VTR (video tape recorder).

[0002]

2. Description of the Related Art In a spindle motor for information equipment, a spindle motor for audiovisual equipment, and the like, conventionally, a bearing unit as shown in FIGS. 10 (a) and 10 (b) has been used as a bearing for supporting its rotating portion. Has been done. The bearing unit shown in FIG. 10 includes a shaft 111, two radial ball bearings 112 that support the shaft 111, and these bearings 112.
And a cylindrical sleeve 113 that supports the outer ring 112a of the above, and a ring-shaped spacer 114 is interposed between bearings 112 in this sleeve 113.

By the way, when such a bearing unit is used in information equipment, audio-visual equipment, etc., the bearing unit is usually assembled in a cylindrical housing 115, and a sleeve 113 is bonded or press-fitted into the housing 115 or a set screw 116. (See (a) and (b) in FIG. 11) or the tolerance ring 117 (refer to (a) and (b) in FIG. 12) or the like, and the bearing unit is assembled in the housing 115.

[0004]

However, as shown in FIG.
As shown in FIG. 3, when the bearing unit is assembled in the housing by adhesion, it is necessary to fill a sufficient amount of adhesive between the outer peripheral surface of the sleeve 113 and the inner peripheral surface of the housing 115. If the filling is insufficient, there is a problem that the adhesive strength of the sleeve 113 to the housing 115 is reduced and the bearing unit easily comes out of the housing. Further, the adhesive needs to be sufficiently solidified, and various problems occur even when the solidification is insufficient.

On the other hand, when the bearing unit is assembled into the housing by press-fitting, the press-fitting load may be excessive or insufficient depending on the size of the tightening margin between the outer diameter of the sleeve and the inner diameter of the housing. There is a problem that has to be. On the other hand, as shown in FIG. 11, when the bearing unit is assembled in the housing by using the set screw 116, the above problem does not occur, but the set screw 116 is loosened due to vibration. There is a set screw 116 to prevent this.
There is a problem in that if the tightening is increased, the sleeve 113 may be deformed or deformed to lower the rotational accuracy.

Further, as shown in FIG. 12, when the bearing unit is assembled in the housing by using the tolerance ring 117, galling may occur when the tolerance ring 117 is inserted in the housing 115.
There is a problem that the metal powder generated by galling enters the inside of the bearing unit as a foreign substance. Further, all of the above-mentioned bearing units have a structure in which the sleeve 113 is interposed, and the inner periphery of the sleeve 113 and the outer periphery of the bearing are fixed by adhesion or light press-fitting. Therefore, also in the sleeve 113, the above-mentioned problems due to adhesion and press fitting occur. That is, in the case of utilizing the adhesion, when the bearing is tilted and fixed due to the gap, the rotational torque fluctuates. Further, when press-fitting is used, the clearance inside the bearing is changed, and the bearing rigidity changes greatly. Therefore, a problem arises in that the tightening margin setting must be strictly managed.

The present invention has been made in view of the above problems, and an object thereof is to provide a bearing unit which can be easily assembled in a housing without using a method such as bonding, press fitting, or screwing. To provide.

[0008]

In order to achieve the above object, a bearing unit according to the invention of claim 1 comprises a shaft,
In a bearing unit that has two bearings that support this shaft and a ring-shaped spacer provided between the two bearings and that is used by being assembled in the housing, a slit is formed between both ends. It has a cylindrical shape and is fitted to the outer peripheral surface of the outer ring of each of the two bearings and the outer peripheral surface of the spacer, and is provided with a bush having an inner peripheral surface provided with a convex portion or a concave portion in a region facing the spacer. At the same time, a concave portion or a convex portion that engages with the convex portion or the concave portion of the bush is provided on the outer peripheral surface of the spacer.

A bearing unit according to a second aspect of the present invention is the bearing unit according to the first aspect, wherein the outer peripheral surface of the bush is a concave portion or a concave portion which engages with a convex portion or a concave portion formed on the inner peripheral surface of the housing. The feature is that a convex portion is provided. Further, the bearing unit according to claim 3,
The bearing unit according to claim 1 or 2 is characterized in that a concave portion or a convex portion provided on the inner peripheral surface of the bush is formed in the circumferential direction.

A bearing unit according to a fourth aspect of the present invention is the bearing unit according to the second aspect, characterized in that the concave portion or the convex portion provided on the outer peripheral surface of the bush is formed in the circumferential direction. A bearing unit according to a fifth aspect is the bearing unit according to any one of the first to fourth aspects, wherein the bush is made of a material having a low Young's modulus.

A bearing unit according to a sixth aspect is the bearing unit according to any one of the second to fifth aspects,
It is characterized in that a portion where the convex portion or the concave portion is formed on the outer peripheral surface of the bush has an elastic structure. The bearing unit according to claim 7 is the bearing unit according to any one of claims 2 to 4, wherein the elastic structure is formed by a support portion having a gap formed between the bearing and the outer peripheral surface of the spacer. The convex portion or the concave portion on the outer peripheral surface of the bush is formed on the support portion.

A bearing unit according to an eighth aspect is the bearing unit according to the seventh aspect, characterized in that the bearing unit is provided with a mounting member to be mounted in the gap. A bearing unit according to a ninth aspect is the bearing unit according to the eighth aspect, wherein the bush has a shape that is attachable to and detachable from the housing while incorporating the spacer and the bearing, and removes the mounting member. The support portion bends toward the outer peripheral surface side of the bearing or spacer when attached to or detached from the housing, and the concave portion or convex portion of the outer peripheral surface is the convex portion or concave portion of the inner peripheral surface of the housing. The feature is that the engagement is released.

A bearing unit according to a tenth aspect of the present invention is
The bearing unit according to claim 8 or 9, wherein the mounting member has a handle protruding to the outside. Further, in the bearing unit according to claim 11, a shaft, two bearings that support the shaft, and a ring-shaped spacer that is located between the two bearings are provided on an inner peripheral surface of the bearing unit. A cylindrical sleeve fitted to the outer peripheral surface of the bearing, and used in a housing assembled in a housing, having a cylindrical shape with slits formed between both ends and fitted to the outer peripheral surface of the sleeve. And a bush having a convex portion or a concave portion provided on the inner peripheral surface thereof, and a concave portion or a convex portion engaging with the convex portion or the concave portion of the bush is provided on the outer peripheral surface of the sleeve. .

The bearing unit according to claim 12 is
The bearing unit according to claim 11 is characterized in that the outer peripheral surface of the bush is provided with a concave portion or a convex portion that engages with a convex portion or a concave portion formed on the inner peripheral surface of the housing. A bearing unit according to a thirteenth aspect is the bearing unit according to the eleventh aspect or the twelfth aspect, wherein the concave portion or the convex portion provided on the inner peripheral surface of the bush is formed in the circumferential direction. .

The bearing unit according to claim 14 is
The bearing unit according to claim 12 is characterized in that a concave portion or a convex portion provided on the outer peripheral surface of the bush is formed in the circumferential direction. A bearing unit according to a fifteenth aspect is the bearing unit according to any one of the eleventh to fourteenth aspects, wherein the bush is made of a material having a low Young's modulus.

The bearing unit according to claim 16 is
The bearing unit according to any one of claims 12 to 15 is characterized in that a portion where the convex portion or the concave portion is formed on the outer peripheral surface of the bush has an elastic structure. The bearing unit according to claim 17 is the bearing unit according to claim 1.
The bearing unit according to any one of claims 2 to 15, wherein the elastic structure is formed by a supporting portion having a gap formed between the outer peripheral surface of the sleeve, and the convex portion or the concave portion of the outer peripheral surface of the bush is the supporting portion. It is characterized by being formed in.

The bearing unit according to claim 18 is
The bearing unit according to claim 17 is provided with a mounting member mounted in the gap.
A bearing unit according to a nineteenth aspect is the bearing unit according to the eighteenth aspect, wherein the bush has a shape that is attachable to and detachable from the housing while being fitted to the sleeve, and removing the mounting member. , When attaching to or detaching from the housing, the supporting portion bends toward the outer peripheral surface side of the sleeve, and the concave portion or convex portion of the outer peripheral surface releases the engagement with the convex portion or concave portion of the inner peripheral surface of the housing. The feature is that it is designed to do.

The bearing unit according to claim 20 is
The bearing unit according to claim 18 or 19, wherein the mounting member has a handle protruding to the outside. Here, in the bearing unit according to claim 1, bushes are fitted to the outer peripheral surfaces of the two bearings and the outer peripheral surface of the spacer by fitting, and the convex or concave portion of the inner peripheral surface of the bush and the outer peripheral surface of the spacer are formed. The concave portion or the convex portion is engaged, and 2
The bush is positioned with respect to one bearing or spacer. Further, in the bearing unit according to claim 11, the bush is mounted on the outer peripheral surface of the sleeve by fitting, and the convex portion or the concave portion on the inner peripheral surface of the bush is engaged with the concave portion or the convex portion on the outer peripheral surface of the sleeve. The bush is positioned with respect to the sleeve.

Further, in the bearing unit according to the second and the twelfth aspects, when the bearing unit is press-fitted into the housing,
The convex portion or concave portion of the housing and the concave portion or convex portion of the bush are engaged with each other to position the bearing unit with respect to the housing. In the bearing unit according to the third aspect of the invention, the bush is attached to the two bearings or the spacer without positioning the bearing and the spacer in the circumferential direction. Further, in the bearing unit according to the thirteenth aspect, the bush is mounted without aligning the position in the circumferential direction with respect to the sleeve, and the bush is positioned with respect to the sleeve.

Here, the shape of the concave portion or the convex portion formed on the inner peripheral surface of the bush in the circumferential direction may be an annular shape extending in the circumferential direction or a shape formed by a plurality of members spaced apart in the circumferential direction. . For example, if the concave portion or the convex portion is formed to extend in the axial direction, it is necessary to mount the bush at the circumferential position with respect to the bearing and the spacer or the sleeve, but the bearing unit according to claim 3 or 13. According to the configuration, the bush can be mounted without aligning the position in the circumferential direction with respect to the bearing and the spacer or the sleeve.

Further, in the bearing unit according to the present invention, the bearing unit is mounted without aligning the position in the circumferential direction with respect to the housing, and the bearing unit is positioned with respect to the housing. Here, examples of the shape of the concave portion or the convex portion formed on the outer peripheral surface of the bush in the circumferential direction include an annular shape extending in the circumferential direction and a shape formed by a plurality of members spaced apart in the circumferential direction. For example, if the concave portion or the convex portion is formed in a shape that extends in the axial direction, it is necessary to mount the bearing unit in alignment with the housing in the circumferential direction, but according to the configuration of the bearing unit according to claims 4 and 14, , Bushing can be installed without aligning the circumferential position with respect to the housing.

In the bearing unit according to the fifth and fifteenth aspects, the bearing unit can be press-fitted into the housing with a small force. Further, in the bearing unit according to claims 6 and 16, when the convex portion or the concave portion on the outer peripheral surface of the bush is engaged with the concave portion or the convex portion on the inner peripheral surface of the housing, the convex portion or the concave portion on the outer peripheral surface of the bush is formed. Is elastically displaced. Particularly, in the bearing unit according to claims 7 and 17, the elastic structure is realized as a simple structure.

Further, in the bearing unit according to the eighth, ninth, eighteenth and nineteenth aspects, by mounting the mounting member in the gap, the convex portion or the concave portion of the bush and the concave portion or the convex portion of the spacer are engaged with each other. Be certain. Further, by removing the mounting member from the gap, the bearing unit can be freely attached to and detached from the housing. And claims 10 and 20
In the bearing unit described, the mounting member is attached and detached by the handle portion.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 5 are views showing an embodiment of the present invention, FIG. 1 is a sectional view of a bearing unit, and FIG.
4 is a sectional view taken along the line I-I of FIG. 1, FIG. 3 is a front view of a bearing unit and a housing according to an embodiment of the present invention, and FIG.
Is a sectional view taken along line II-II of FIG. 1, and FIG. 5 is an enlarged sectional view showing a part of FIG.

As shown in FIGS. 1 and 2, the bearing unit 10 of the embodiment includes a shaft 11, two radial ball bearings 12 supporting the shaft 11, and an outer ring 12a of the radial ball bearing 12. The interlock bush 20 for supporting, and the spacer 14 provided between the two radial ball bearings 12 in the interlock bush 20,
As shown in FIGS. 3 and 4, it is used by being incorporated in a cylindrical housing 15.

As shown in FIGS. 1 and 2, the spacer 14 is
The spacer 14 is formed in a cylindrical shape, and has an annular positioning groove 14a along the circumferential direction at the substantially center of the outer peripheral surface of the spacer 14.
Is provided. An interlock bush 20 is fitted around the outer periphery of the spacer 14. Here, the positioning groove portion 14a forms a concave portion that engages with a first positioning protrusion 22 described later provided on the interlock bush 20. The interlock bush 20 includes two radial ball bearings 1 that are spaced apart by the spacer 14.
It has a cylindrical shape having such a length as to cover both of the outer rings 12a of 2 and 12. For example, the interlock bush 20 is made of a resin material.

As shown in FIG. 2, the interlock bush 20 is formed with a notch portion 21 that extends linearly in the axial direction in a part of the circumferential direction. Further, as shown in FIG. 5, the interlock bush 20 has a spacer 1
A ring-shaped first positioning protrusion 22 is provided on the inner peripheral surface of the inner peripheral surface of the inner peripheral surface 4 in the form of a ridge along the peripheral direction. The first positioning protrusion 22 and the positioning groove portion 14a of the spacer 14 are engaged with each other to thereby interlock the bush 20 and the spacer 1.
4 and 4 are positioned in the axial direction.

Further, the interlock bush 20 has
A fringe portion 23 as a support portion is provided at one end. The fringe portion 23 is the outer ring 12 of the radial ball bearing 12.
The thickness of the interlock bush 20 is smaller than that of the interlock bush 20 so that a gap is formed between the outer peripheral surface of a and the outer surface of a. The root 23a of the fringe portion 23 has a constricted shape. The fringe portion 23 is provided on its outer peripheral surface with a first annular positioning protrusion 23b which is a convex strip extending in the circumferential direction. The interlock bush 20 has an insert ring 30 as a thin mounting member mounted in a gap between the fringe portion 23 and the radial ball bearing 12. A housing 15 is arranged on the outer circumference of the interlock bush 20.

The insert ring 30 is a cylindrical portion 3 inserted in a gap between the fringe portion 23 of the interlock bush 20 and the outer peripheral surface of the outer ring 12a of the radial ball bearing 12.
0a and a handle portion 30b which is formed at the end of the cylindrical portion 30a and projects outward with respect to the end surfaces of the interlock bush 20 and the radial bearing 12. Here, the handle portion 30b has, for example, a flange shape. Here, the notch portion 21 forms a slit between both ends of the interlock bush 20, and the first positioning portion 22 is a region facing the spacer 14 of the inner peripheral surface of the interlock bush 20. And the second positioning portion 23b is a convex portion provided on the outer peripheral surface of the interlock bush 20.
The fringe portion 23 forms a support portion in which a gap is formed between the fringe portion 23 and the outer peripheral surface of the radial ball bearing 12, thereby realizing an elastic structure, and the insert ring 30
Is a mounting member that is mounted in a gap between the radial ball bearing 12 and the outer peripheral surface thereof.

As shown in FIGS. 2 and 3, the housing 15 is formed in a cylindrical shape. This housing 15
Has a ring-shaped positioning groove 15a along the circumferential direction.
(See FIG. 4) are provided. Positioning groove 15a
Is a second member provided on the outer peripheral surface of the interlock bush 20.
Is a recess that engages with the positioning protrusion 23b. The positioning groove 15a and the interlock bush 2
The second positioning protrusion 23b of 0 forms a positioning portion that positions the interlock bush 20 and the housing 15 in the axial direction by engaging with each other.

The bearing unit 10 and the housing 15 are constructed as described above. Next, the bearing unit 10
The procedure of assembling the inside of the housing 15 will be described. FIG. 6 shows the assembling procedure. Bearing unit 1
When assembling 0 into the housing 15, first, the two radial ball bearings 12, 12 and the spacer 14 mounted on the shaft 11 separated by the spacer 14 as shown in FIG. Interlock bush 20 of (a),
Attach it as shown in (c) in the figure. As a result, the bearing unit 10 is formed.

At this time, the interlock bush 20
Has a variable inner diameter due to the notch 21,
It is possible to easily fit the radial ball bearings 12, 12 and the spacer 14. In addition, the first positioning projection 22 provided on the inner peripheral surface of the interlock bush 20 has the spacer 14
The interlock bush 20 is positioned at a predetermined position with respect to the radial ball bearings 12, 12 or the spacer 14 by being engaged with the positioning groove portion 14a.

Next, the bearing unit 10 of (c) in the figure is assembled into the housing 15 (d) of the figure by press fitting as shown in (e) of the figure. At this time, the second positioning protrusion 23b of the fringe portion 23 is brought into contact with the convex portion 15b of the housing 15 (see FIG. 5) to bend the fringe portion 23, and thereafter, the second positioning protrusion 23b is provided on the outer peripheral surface of the interlock bush 20. The second positioning protrusion 23b enters into the positioning groove portion 15a of the housing 15 and the positioning groove portion 15a
I will start to bite.

As a result, the interlock bush 20
Second positioning protrusion 23b is engaged with the positioning groove portion 15a of the housing 15 to position the bearing unit 10 (or the interlock bush 20) at a predetermined position with respect to the housing 15. Is constrained so that it does not shift in the axial direction. Next, the insert ring 30 of (f) in the figure is inserted or fitted into the gap between the fringe portion 23 and the radial ball bearing 12. As a result, the engagement between the second positioning protrusion 23b and the positioning groove 15a of the housing 15 is ensured. Here, the insert ring 30 forms a fastening portion between the bearing unit 10 and the housing 15 in cooperation with the fringe portion 23.

Further, from the housing 15 to the bearing unit 1
When removing 0, the insert ring 30 can be removed to remove it. That is, the handle portion 30b of the insert ring 30 is held, and the insert ring 30 is pulled out to remove the spacer 14 and the radial bearings 12, 1
It is possible to remove the bearing unit 10 in which the 2 is still incorporated from the housing 15. The second positioning protrusion 23b provided on the outer peripheral surface of the interlock bush 20.
When the bearing unit 10 and the positioning groove 15a of the housing 15 are engaged with each other,
The second positioning protrusion 23b of the fringe portion 23 is attached to the convex portion 15b of the housing 15 by moving the second positioning protrusion 23b.
Are brought into contact with each other to bend the fringe portion 23, and the fringe portion 23 is removed.

Above, the bearing unit 10 and the housing 1
The configuration of No. 5, and the assembling and removing procedures thereof have been described. In the embodiment, the inter-block bush 2
0 is interposed between the radial ball bearings 12, 12 and the housing 15. That is, instead of the sleeve provided in the conventional bearing unit, the interlock bush 20 having a positioning function such as the first and second positioning portions 22 and 23b is provided. As a result, the sleeve can be eliminated to save the space of the device. Further, since there is no sleeve and the positioning is performed only by mounting the interblock bush 20, the number of assembling steps can be reduced. Further, since the number of assembling steps can be omitted, the cost can be reduced.

The bearing unit 10 is attached to the housing 15
Simply insert the interlock bush 20 into the second
Since the positioning protrusion 23b of the above is engaged with the positioning groove portion 15a of the housing 15, the bearing unit 10 can be easily positioned in the housing 15. Moreover,
The insert ring 30 can ensure such engagement. This makes it possible to reliably prevent the axial displacement. Further, by making the insert ring 30 detachable, the bearing unit 10 can be freely attached to and detached from the housing 15.

Further, since the first positioning protrusion 22 and the second positioning protrusion 23b are formed in an annular shape along the circumferential direction, the radial ball bearings 12, 12, and 12 An interlock bush 20 can be mounted on the spacer 14, and the bearing unit 10 is mounted and formed in this manner to mount the bearing unit 10 on the housing 1.
Can be attached to 5. Further, since the bearing unit 10 can be press-fitted into the housing 15, the bearing unit 10 (interlock bush 20) can be mounted.
And the housing 15 are fixed to each other with a uniform force in the circumferential direction, and without screw tightening or adhesion,
It will surely be fixed. Therefore, the problem caused by tightening and adhering the screws, that is, the problem that the coaxiality cannot be obtained, and the problem that the bearing deforms due to the screw tightening do not occur.

Since the spring constant of the fastening portion is determined by the Young's modulus of the resin, the wall thickness, or the projected area in the lateral direction, it can be set to any value. Therefore, an optimum spring constant should be selected in consideration of the resistance when the bearing unit 10 is mounted on the housing 15 and the force in the direction of pulling the bearing unit 10 against the housing 15 after mounting (the state where the insert ring 30 is not mounted). You can Further, when the bearing unit 10 is attached to or detached from the housing 15 shown in FIG. 6 (e), the second positioning protrusion 23b of the fringe portion 23 is brought into contact with the convex portion 15b of the housing 15, The fringe portion 23 is elastically displaced so as to reduce its diameter. However, since the base of the fringe portion 23 has a constricted shape, the fringe portion 23 is easily bent. Therefore, for example, the resistance due to the displacement of the diameter reduction can be reduced. This allows the housing 15
The bearing unit 10 can be easily attached to and detached from the bearing.

By forming the interlock bush 20 with a resin material having a small Young's modulus, for example,
Even if the hole tolerance (or fitting tolerance) of the housing 15 becomes large, the press-fitting force can be reduced. For example, hole tolerance (or fitting tolerance)
A housing for a swing arm and the like can be given as an example of a housing having a large size. Further, since the pull-out load of the bearing unit 10 is determined by the fastening force of the fastening portion,
There is no need to tighten the control of the pressure input, and it can be rough.

Even if the housing 15 is made of a soft metal, the interlock bush 20 is made of a resin material, so that the generation of powder or dust due to sliding when the bearing unit 10 is inserted into the housing 15 is prevented. be able to. Further, by forming the interlock bush 20 with a resin material, it is possible to improve vibration damping characteristics. Further, the insert ring 30 can strengthen the fastening of the fringe portion 23. For example,
Since the insert ring 30 and the fringe portion 23 form a fastening portion provided in the circumferential direction between the housing 15 and the interlock bush 20, the fastening portion firmly fastens the circumferential direction by a uniform fastening force. be able to.

The present invention is not limited to being applied to the above embodiment. FIG. 7 shows another embodiment to which the present invention is applied. Here, the shapes of the fastening portion, that is, the fringe portion 23 and the insert ring 31 are different from those of the above-described embodiment.
The fringe portion 23 and the insert ring 31 are formed in a so-called hook shape that engages with each other or locks when the insert ring 31 is inserted. Further, the insert ring 31 has a wedge-shaped portion that engages with the inner peripheral surface of the end portion of the fringe portion 23.

In this way, the fringe portion 23 and the insert ring 31 are shaped so as to mesh with each other,
It is possible to prevent the insert ring 31 from coming off easily after mounting. As a result, the insert ring 3 is subject to vibration and the like.
1 can be prevented from slipping or falling off, and the housing 15 and the bearing unit 10 can be prevented from shifting in the axial direction. Also, insert ring 3
By making 1 into a wedge shape, as shown in FIG. 8, when the insert ring 31 is mounted in the direction of arrow A in the drawing, the fringe portion 23 is pushed out in the direction of arrow B in the drawing due to its wedge effect. Accordingly, the fastening by the fastening portion can be strengthened, and the housing 15 and the bearing unit 10 can be firmly integrated.

Further, as shown in FIG. 7, by providing such fastening portions on both sides, the integration between the housing 15 and the bearing unit 10 can be further strengthened. Further, in the above-described embodiment, the case where the positioning groove portion 14a is formed in the spacer 14 and the first positioning protrusion 23 is formed in the interlock bush 20 has been described, but the present invention is not limited to this. That is, for example, as shown in FIG. 7, a ridged positioning protrusion 14b may be provided on the outer peripheral side of the spacer 14 along the circumferential direction thereof, while the positioning groove 24 may be provided on the interlock bush 20 side.

Further, in the above-described embodiment, the case where the first and second positioning groove portions 22 and 23b have an annular shape extending in the circumferential direction has been described, but the present invention is not limited to this. For example, the first and second positioning parts are
It may be realized by a plurality of members that are spaced apart in the circumferential direction. Further, the shape may be along the axial direction. However, in this case, circumferential alignment is required. Further, in the above-described embodiment, the slit formed between the both ends of the interlock bush 20 is the linear notch 21 extending in the axial direction, but the slit is not limited to this. That is, for example, the slit allows the inner diameter of the interlock bush 20 to be freely set,
Any shape may be used as long as it can be fitted into the radial bearing.

Further, although the first positioning protrusion of the fringe portion 23 has a convex shape in the above-described embodiment, it may have a concave shape. In this case, the housing 15 is provided with a protrusion corresponding to the recess provided in the fringe portion 23. In addition, as shown in FIG.
The present invention can be applied to the bearing unit 10 provided with. In this case, the sleeve 40 has a spacer 42 on its inner peripheral surface.
While being integrally provided, an annular positioning groove portion 41a extending in the circumferential direction is provided substantially at the center of the outer peripheral surface.
The interlock bush 20 has a sleeve 40.
The first positioning protrusion 22 has a circular ring shape and has an inner diameter such that it can be fitted to the outer peripheral surface of the, and the inner peripheral surface thereof is engaged with the positioning groove portion 41a. Further, the insert ring 30 is attachable / detachable to / from the gap formed between the outer peripheral surface of the sleeve 40 and the fringe portion 23.

In the case of such a configuration, the radial bearing 12
Bearing unit 10 constituted by fitting an interlock bush 20 on the outer peripheral surface of a sleeve 40 in which
However, the insert ring 30 is detachably attached to the housing 15, and when the insert ring 30 is attached, the insert ring 30 is firmly fixed. Even in this case, as shown in FIG. 7, the sleeve 40 side may be provided with a convex positioning protrusion along the circumferential direction thereof, while the interlock bush 20 side may be provided with a positioning groove portion. .

In the above-described embodiment, the case where the bearing is a radial ball bearing has been described, but the bearing may be a thrust bearing or the like.

[0049]

As described above, according to the first aspect of the invention, the bearing unit can be press-fitted into the housing by the bush having a positioning function for the bearing and the spacer instead of the sleeve. it can. In addition, claim 1
According to the first aspect of the invention, even if the bearing unit is provided with the sleeve, the bearing unit can be press-fitted into the housing by the bush having a positioning function for the sleeve. Also, if the bush is made of a resin material,
Vibration damping characteristics can be improved.

According to the second and twelfth aspects of the present invention, the bearing unit can be positioned in the housing by the convex portion or the concave portion on the outer peripheral surface of the bush simply by press-fitting the bearing unit into the housing. Further, claim 3
According to the invention described above, the bush can be mounted without aligning the positions of the bearing and the spacer in the circumferential direction. Further, according to the invention of claim 13, the bush can be mounted without aligning the position in the circumferential direction with respect to the sleeve.

Further, according to the invention described in claims 4 and 14, the bearing unit can be mounted without aligning the position in the circumferential direction with respect to the housing. In addition, claims 5 and 15
According to the described invention, the bearing unit can be press-fitted into the housing with a small force. Further, according to the inventions of claims 6 and 16, the convex portion or the concave portion of the outer peripheral surface of the bush is elastically displaced, so that the convex portion or the concave portion of the outer peripheral surface of the bush and the concave portion or the convex portion of the housing are engaged with each other. This facilitates mounting of the bearing unit on the housing. Particularly, according to the invention described in claims 7 and 17, such an elastic structure is realized as a simple structure.

According to the eighth, ninth, eighteenth and nineteenth aspects of the present invention, by mounting the mounting member in the gap, engagement between the convex portion or concave portion of the bush and the concave portion or convex portion of the spacer is performed. Is reliable, and the bearing unit can be securely fixed to the housing. Further, by removing the mounting member from the gap, the bearing unit can be freely attached to and detached from the housing. Further, in the bearing unit according to the tenth and twentieth aspects of the invention, the mounting portion can be easily attached and detached by the handle portion.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a bearing unit according to an embodiment of the present invention.

2 is a cross-sectional view taken along the line I-I of FIG.

FIG. 3 is a front view showing the bearing unit and the housing according to the embodiment of the present invention.

FIG. 4 is a sectional view taken along the line II-II in FIG.

FIG. 5 is a sectional view showing a main part of a bearing unit and a housing.

FIG. 6 is a diagram showing a procedure for assembling the bearing unit in the housing.

FIG. 7 is a cross-sectional view showing a main part of a bearing unit and a housing according to another embodiment.

FIG. 8 is a view used for explaining mounting of the insert ring.

FIG. 9 is a cross-sectional view showing a main part of a bearing unit and a housing according to still another embodiment.

FIG. 10 shows an example of a conventional bearing unit,
(A) is sectional drawing, (b) is a front view.

11A and 11B are views for explaining a conventional technique for assembling a bearing unit in a housing, in which FIG. 11A is a sectional view and FIG.
Is a front view.

FIG. 12 is a view for explaining another conventional technique for assembling the bearing unit in the housing, in which (a) is a sectional view,
(B) is a front view.

[Explanation of symbols]

11 axes 12 radial ball bearings 12a outer ring 13 Sleeve 14 Zama 14a Positioning groove 15a Positioning groove 20 Interlock bush 22 First positioning protrusion 23 Fringe 23b Second positioning protrusion 30,31 Insert ring 40 sleeve

Claims (20)

[Claims] 1. A shaft and two bearings supporting the shaft,
A bearing unit that has a ring-shaped spacer provided between the two bearings and is used by being assembled in the housing has a cylindrical shape with slits formed between both ends. Fitted on the outer peripheral surface of each outer ring and the outer peripheral surface of the spacer, the inner peripheral surface is provided with a bush provided with a convex portion or a concave portion in a region facing the spacer,
A bearing unit, characterized in that a concave portion or a convex portion that engages with the convex portion or the concave portion of the bush is provided on an outer peripheral surface of the spacer. 2. The bearing according to claim 1, wherein a concave portion or a convex portion that engages with a convex portion or a concave portion formed on the inner peripheral surface of the housing is provided on the outer peripheral surface of the bush. unit. 3. The bearing unit according to claim 1, wherein the concave portion or the convex portion provided on the inner peripheral surface of the bush is formed in the circumferential direction. 4. The bearing unit according to claim 2, wherein the concave portion or the convex portion provided on the outer peripheral surface of the bush is formed in the circumferential direction. 5. The bearing unit according to claim 1, wherein the bush is made of a material having a low Young's modulus. 6. The bearing unit according to claim 2, wherein a portion where a convex portion or a concave portion is formed on the outer peripheral surface of the bush has an elastic structure. 7. The elastic structure is formed by a supporting portion having a gap formed between the bearing and the outer peripheral surface of the spacer, and a convex portion or a concave portion of the outer peripheral surface of the bush is formed in the supporting portion. The bearing unit according to any one of claims 2 to 4, wherein: 8. The bearing unit according to claim 7, further comprising a mounting member mounted in the gap. 9. The bush has a shape that can be attached to and detached from the housing while the spacer and the bearing are assembled, and when the attachment member is detached and attached to and detached from the housing, the support portion is formed. Bends toward the outer peripheral surface of the bearing or spacer, and the concave portion or the convex portion of the outer peripheral surface releases the engagement with the convex portion or the concave portion of the inner peripheral surface of the housing. The bearing unit according to claim 8. 10. The bearing unit according to claim 8, wherein the mounting member has a handle protruding to the outside. 11. A shaft, two bearings that support the shaft, and a ring-shaped spacer that is located between the two bearings are provided on the inner peripheral surface, and are fitted on the outer peripheral surfaces of the two bearings. A bearing unit that has a cylindrical sleeve to be fitted and is used by being assembled in a housing, and has a cylindrical shape with a slit formed between both ends, and is fitted to the outer peripheral surface of the sleeve, and the inner peripheral surface A bearing unit, comprising: a bush provided with a convex portion or a concave portion, and a concave portion or a convex portion engaging with the convex portion or the concave portion of the bush is provided on an outer peripheral surface of the sleeve. 12. The recess or the protrusion that engages with the protrusion or the recess formed on the inner peripheral surface of the housing is provided on the outer peripheral surface of the bush.
Bearing unit described. 13. The bearing unit according to claim 11, wherein the concave portion or the convex portion provided on the inner peripheral surface of the bush is formed in the circumferential direction. 14. The bearing unit according to claim 12, wherein the concave portion or the convex portion provided on the outer peripheral surface of the bush is formed in the circumferential direction. 15. The bearing unit according to claim 11, wherein the bush is made of a material having a low Young's modulus. 16. The bearing unit according to claim 12, wherein a portion where the convex portion or the concave portion is formed on the outer peripheral surface of the bush has an elastic structure. 17. The elastic structure is formed by a supporting portion having a gap formed between the outer peripheral surface of the sleeve and the convex portion or the concave portion on the outer peripheral surface of the bush is formed in the supporting portion. The bearing unit according to any one of claims 12 to 15. 18. The bearing unit according to claim 17, further comprising a mounting member mounted in the gap. 19. The bush has a shape that is attachable to and detachable from the housing while being fitted to the sleeve, and when the attaching member is detached and attached to and detached from the housing, the supporting portion is 19. The flexure of the sleeve toward the outer peripheral surface side, and the concave portion or the convex portion of the outer peripheral surface releases the engagement with the convex portion or the concave portion of the inner peripheral surface of the housing. Bearing unit. 20. The bearing unit according to claim 18, wherein the mounting member has a handle protruding to the outside.