JPH109251A - Bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the floating up and slanting of a thrust receiver by preparing an opening part formed so as to open for the hit surface in the thrust direction of a bearing part and a thrust receiver arranged thereon. SOLUTION: A bearing 12 is provided with a bearing part 12b integrated with a housing having a cylindrical bearing hole 12a whose one end is released in a thrust direction, a slit 12c opened outside the bearing part toward-side on the perpendicular direction to the thrust direction from the hit surface in the thrust direction of the close end of the bearing hole 12a of the bearing part 12b and a sheet shape thrust receiver 16 which is the thrust receiver inserted from the outside into this slit. The end surface of a rotary shaft 21 is supported by the sheet shape thrust receiver 16. In this case, as the material of the thrust receiver 16 is selected properly, the wear of the rotary shaft 21 is reduced and also the hitting and resonance by the rotary shaft 21 are restrained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing, and more particularly, to a housing-integrated bearing having a thrust receiver.

[0002]

2. Description of the Related Art Conventionally, such a bearing is constructed, for example, as shown in FIG. In FIG. 8, the bearing 1 is
The housing 2 includes a housing 2 having a hollow portion 2a open at one end in the thrust direction, a bearing portion 3 press-fit into the hollow portion 2a of the housing 2, and a thrust receiver 4 provided at a closed end of the hollow portion 2a. ing.

[0003] Thus, a shaft (not shown) to be supported inserted into the hollow portion of the bearing portion 3 has its peripheral surface rotatably supported by the bearing portion 3 and its end surface formed of a thrust bearing. 4.

[0004] A bearing 5 having a configuration as shown in FIG. 9 is also known. In FIG. 9, a bearing 5 includes a housing 2 having a hollow portion 2 a having one end opened in the thrust direction.
And a bearing portion 3 press-fitted into a hollow portion 2a of the housing 2.
A thrust receiver 4 inserted from below into a through hole 2b provided at a closed end of the hollow portion 2a, and a pressing plate 6 made of a metal plate or the like inserted below the thrust receiver 4. I have.

Accordingly, the thrust receiver 4 is caulked by the holding plate 6 in the through hole 2b of the housing 2, and
Fixedly held. Therefore, the shaft (not shown) to be supported inserted into the hollow portion of the bearing portion 3 has its peripheral surface rotatably supported by the bearing portion 3 and its end surface supported by the thrust receiver 4. It has become so.

However, the two bearings 1, 5 described above
In both cases, the structures are complicated, and the thrust receiver 4 may rise or tilt. In addition, there is a problem that the number of components increases, and component costs and assembly costs increase.

For this reason, a bearing 7 having a configuration as shown in FIG. 10 is also known. In FIG. 10, the bearing 7 is
Cylindrical bearing hole 8 open at one end in the thrust direction
and a housing-integrated resin bearing portion 8 having a.

As a result, a shaft (not shown) to be supported inserted into the bearing hole 8a of the bearing portion 8 has its peripheral surface rotatably supported by the bearing portion 8 and its end surface is Thrust direction abutting surface 8 of bearing hole 8a of bearing portion 8
b.

[0009]

However, in such a bearing 7 comprising a resin bearing portion integral with the housing, the abutting surface 8b acting as a thrust receiver.
However, since the thrust bearing is made of the same material as that of the bearing portion 8, the relatively hard material of the thrust bearing causes shaft abrasion, which affects the rotation of the shaft to be supported. This will cause resonance. Furthermore, since the thrust receiver and the bearing part have an integral structure,
The impact of the above-mentioned beating and resonance affects the entire bearing portion.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a bearing having a thrust receiver with a simple structure so that the thrust receiver does not float or tilt.

[0011]

SUMMARY OF THE INVENTION According to the present invention, there is provided a bearing comprising a housing-integrated resin bearing having a bearing hole having an open end in the thrust direction. This is achieved by a bearing characterized by comprising an opening formed to be open to the thrust abutting surface and a thrust receiver arranged in the opening.

According to the above configuration, the thrust receiver is accurately positioned on the thrust-direction abutting surface of the bearing by a simple operation of merely inserting the thrust receiver into the opening provided in the bearing. Securely held. Therefore, the number of parts can be reduced, and parts costs and assembly costs can be reduced.

Regarding the thrust of the shaft to be supported in the thrust direction, it is possible to appropriately select, as the material of the thrust receiver, a material different from that of the bearing portion which can effectively suppress the hit. This will reduce shaft tapping and resonance.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS.
Note that the embodiments described below are preferred specific examples of the present invention, and therefore, various technically preferable limitations are added. However, the scope of the present invention particularly limits the present invention in the following description. It is not limited to these embodiments unless otherwise stated.

FIG. 1 shows a motor to which an embodiment of a bearing according to the present invention is applied. In FIG. 1, a motor 10 includes a fixedly arranged stator unit 11 and a rotor unit 20 rotatably supported by the stator unit 11.

The stator unit 11 includes a stator substrate 11 and
Bearing 12 attached to stator substrate 11 and bearing 1
And a coil 14 wound around the stator core 13 fixedly disposed so as to surround the stator core 2 in the circumferential direction.
And Here, the bearing 12 and the stator core 13 are connected to each other and fixed by screws 15.

On the other hand, the rotor section 20 has a rotating shaft 21 rotatably supported by the bearing 12, and is attached to the rotating shaft 21 via a rotor boss 22a so as to surround the coil 14 from outside. A cylindrical rotor yoke 22 having an open lower end,
And a rotor magnet 23 provided on the inner surface of the rotor. In this case, the lower part of the rotating shaft 21 in the bearing 12 is supported by a thrust receiver 16 (described later), thereby preventing the rotating shaft 21 from dropping downward.

The above configuration is the same as that of a motor having a conventional bearing, but in the embodiment of the present invention,
The bearing 12 includes a housing-integrated bearing portion 12b having a cylindrical bearing hole 12a having one end opened in the thrust direction, and a thrust-direction abutting surface at a closed end of the bearing hole 12a of the bearing portion 12b. A slit 12c, which is an opening formed to open to the outside of the bearing toward one side in a direction perpendicular to the direction, and a sheet-like thrust receiver, which is a thrust receiver inserted from the outside into the slit, 16.

Here, the bearing portion 12b is integrally formed from, for example, resin or the like. Further, the sheet-shaped thrust receiver 16 is made of a material different from the material of the bearing portion 12b, and the material is appropriately selected depending on, for example, hitting of a shaft to be supported (in this case, the rotating shaft 21). It has become.

The motor 10 having the bearing 12 according to the embodiment of the present invention is configured as described above.
2 is assembled as follows. That is, in FIG. 3, the bearing portion 12b formed integrally with the resin first is used.
The guide jig 17 is inserted into the bearing hole 12a with respect to (upper part in FIG. 3). The guide jig 17 is formed such that its lower surface defines a guide surface of the sheet-shaped thrust receiver 16 inserted into the slit 12c.

From this state, the slit 1 of the bearing portion 12b
The sheet-like thrust receiver 16 is inserted into the inside of the bearing 2c from outside the bearing portion 12b. As a result, the sheet-shaped thrust receiver 16 is connected to the inner surface of the slit 12 c and the guide jig 17.
Is guided by the lower surface of the slit 12c.
It will be completely inserted in. In this case, the sheet-shaped thrust receiver 16 is fixedly held to the bearing portion 12b by press-fitting into the slit 12c. However, after the sheet-shaped thrust receiver 16 is completely inserted into the slit 12c, the sheet-shaped thrust receiver 16 is heat-sealed or the like. The receiver 16 may be fixedly held in the slit 12c.

When the rotating shaft 21 is inserted into the bearing hole 12a of the bearing 12 assembled in this manner, the rotating shaft 21 has its peripheral surface rotatably supported by the bearing portion 12b. The end face is supported by the sheet-like thrust receiver 16 inserted into the slit 12c. In this case, by appropriately selecting the material of the thrust receiver 16, the wear of the rotating shaft 21 is reduced, and the beating by the rotating shaft 21 and the resonance are suppressed.

FIGS. 4 and 5 show a second embodiment of the bearing according to the present invention. 4 and 5, the bearing 30 has a slit 12d opened toward both sides in a direction perpendicular to the thrust direction, instead of the slit 12c of the bearing 12 shown in FIG. In this case, since the slits 12d of the bearing portion 12b are open toward both sides, the die is easily formed during molding, and the sheet-shaped thrust receiver 16 is easily inserted into the slit 12d. Will be performed.

In the bearing 30 having such a configuration, the shaft to be supported has a peripheral surface rotatably supported by the bearing portion 12b and an end surface having a sheet-like thrust inserted into the slit 12d. It will be supported by the receiver 16.

FIG. 6 shows a third embodiment of the bearing according to the present invention. 6, the bearing 40 has substantially the same configuration as the bearing 12 of FIG. 2, and is different only in that the sheet-shaped thrust receiver 16 is fixed to the bearing portion 12b by the fixing screw 18. . According to this configuration, the sheet-like thrust receiver 16 inserted into the slit 12c of the bearing portion 12b is screwed to the bearing portion 12b by the fixing screw 18, so that the sheet-like thrust receiver 16 is accidentally dropped from the slit 12c. Is prevented.

In the above embodiment, the coil 1
The case where the bearings 12, 30, and 40 according to the present invention are incorporated in the motor 10 in which the motor 4 is wound around the stator core 13 has been described. However, the present invention is not limited to this. For example, as shown in FIG. Obviously, the present invention can be applied to a motor having the formed flat coil.

In FIG. 7, a motor 50 has substantially the same configuration as the motor 10 shown in FIG. 1, except that a flat coil 51 disposed on a stator substrate 11 instead of the stator core 13 and the coil 14 includes: The configuration is different in that an annular flat rotor magnet 52 attached to a rotor yoke so as to face the flat coil 51 in the axial direction is provided instead of the rotor magnet 23.
In this case, the bearing 12 itself has the same configuration as the bearing 12 (see FIG. 2) in the motor 10 of FIG.
It is obvious that the bearing may have the same configuration as the bearing 30 shown in FIG. 6 or the bearing 40 shown in FIG.

In the motor 50 having such a configuration,
The bearing 12 will function exactly like the bearing 12 in the motor 10 of FIG.

As described above, according to the embodiment of the present invention, the slits 12c and 12d provided in the bearing 12 are provided.
By simply inserting the sheet-shaped thrust receiver 16 into the inside, the thrust-direction abutting surface of the bearing 12
The thrust receiver is accurately positioned and securely held. Therefore, the number of parts is small, and the cost of parts and the cost of assembly are reduced. Regarding the thrust of the shaft to be supported in the thrust direction, a material different from that of the bearing 12 that can effectively suppress the striking can be appropriately selected as a material of the sheet-shaped thrust receiver 16. This will reduce shaft tapping and resonance.

[0030]

As described above, according to the present invention, it is possible to provide a bearing having a thrust receiver with a simple structure so that the thrust receiver does not float or tilt.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a main part of an example of a motor to which a bearing according to the present invention is applied.

FIG. 2 is a sectional view and a bottom view showing a first embodiment of a bearing according to the present invention used in the motor of FIG. 1;

FIG. 3 is a schematic sectional view sequentially showing assembly of a thrust receiver in the bearing of FIG. 2;

FIG. 4 is a sectional view and a bottom view showing a second embodiment of the bearing according to the present invention used in the motor of FIG. 1;

FIG. 5 is a partially enlarged perspective view showing a main part of the bearing of FIG. 4;

FIG. 6 is a sectional view showing a third embodiment of the bearing according to the present invention used in the motor of FIG. 1;

FIG. 7 is a schematic sectional view showing a main part of another example of the motor to which the bearing according to the present invention is applied.

FIG. 8 is a cross-sectional view and a bottom view showing a configuration of an example of a conventional bearing.

FIG. 9 is a cross-sectional view and a bottom view showing the configuration of another example of a conventional bearing.

FIG. 10 is a sectional view showing a configuration of still another example of the conventional bearing.

[Explanation of symbols]

10, 50 ... motor, 11 ... stator part, 1
2, 30, 40 ... bearing, 12a ... bearing hole, 12
b: bearing part, 12c, 12d: slit, 13
... stator core, 14 ... coil, 15 ... screw, 16 ... sheet-like thrust receiver, 17 ... guide jig, 18 ... fixing screw, 20 ... rotor part, 2
DESCRIPTION OF SYMBOLS 1 ... Rotating shaft, 22 ... Rotor yoke, 23 ...
Rotor magnet, 51 ... Flat coil, 52 ...
Rotor magnet.

Claims (4)

[Claims] 1. A bearing comprising a housing-integrated resin bearing portion having a bearing hole with one end opened in the thrust direction, wherein the bearing portion is formed so as to open with respect to a thrust abutting surface of the bearing portion. And a thrust receiver disposed in the opening. 2. The bearing according to claim 1, wherein the thrust receiver is made of a material different from that of the bearing portion. 3. The bearing according to claim 1, wherein the thrust receiver is fixedly held on the bearing by being press-fitted into the opening. 4. The bearing according to claim 1, wherein the thrust receiver is fixedly held to a bearing part by being screwed in a state of being inserted into the opening.