JPH04334943A - Bearing device for motor - Google Patents

Abstract

PURPOSE:To use a catch member of a standard component formed for a ball bearing and to effectively utilize dynamic pressure of lubricant generated between the end face of oil containing bearing and a washer as well. CONSTITUTION:A catch member 7 is mounted at a rotary shaft 1 disposed outside an oil containing bearing 8 for supporting the shaft 1, a slidable washer 10 is interposed between the bearing 8 and the member 7 substantially on the entire surface of the end face 8a of the bearing 8, and the member 7 is so engaged with the washer 10 by engaging means as to be integrally rotated. Then, the washer 10 is rotated integrally with the member 7, sliding of the member 7 from the washer 10 is suppressed, an irregularity in rotation of a motor can be eliminated, the member of a standard component formed for a ball bearing can be used, and wear, friction by a thrust force can be reduced by utilizing dynamic pressure of lubricant generated between the end face 8a of the bearing 8 and the washer 10 to a maximum limit as well.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device for an electric motor, and more particularly to a bearing device for an electric motor that uses an oil-impregnated bearing to support a rotating shaft.

0002

2. Description of the Related Art FIG. 5 is a sectional view showing a conventional bearing device for an electric motor, and FIG. 6 is a plan view showing the bearing device for an electric motor shown in FIG.

In the figure, reference numeral 1 indicates a rotating shaft of a rotor, and reference numeral 2 indicates a bearing holding member provided on a frame of a stator. 3 is a ball bearing that supports the rotating shaft 1; 4 is an outer ring of the ball bearing 3; 5 is an inner ring of the ball bearing 3; and 6 is a rolling element interposed between the outer ring 4 and the inner ring 5. Reference numeral 7 denotes a retaining member attached to the rotating shaft 1, and an extension portion 7a for removal is provided at the end of the retaining member.

In the bearing device for the electric motor having this configuration, the retaining member 7 is attached to the protruding portion of the rotating shaft 1 from the ball bearing 3, and the retaining member 7 restricts the movement of the rotating shaft 1 in the axial direction. There is. In addition, since this retaining member 7 is a standard product made exclusively for the ball bearing 3, it is usually attached to the outer ring 4 of the ball bearing 3.
Only come into contact with Moreover, this standard product retaining member 7 has stable quality and can be obtained at low cost.

Next, another bearing device for an electric motor will be described. FIG. 7 is a sectional view showing another conventional electric motor bearing device disclosed in Japanese Patent Application No. 1-168370, and FIG. 8 is a plan view showing the electric motor bearing device of FIG.

In the figure, reference numeral 8 denotes an oil-impregnated bearing that pivotally supports the rotating shaft 1, and this oil-impregnated bearing 8 is attached to the bearing holding member 2. Reference numeral 9 denotes a sheet metal washer interposed between the oil-impregnated bearing 8 and the retaining member 7, and an axial force (thrust force) applied to the oil-impregnated bearing 8 acts on this washer 9. Further, this washer 9 is formed with a cut-and-raised portion 9a, and this cut-and-raised portion 9a engages with the extension portion 7a of the retaining member 7, so that the washer 9 and the retaining member 7 rotate together. .

In the bearing device for the electric motor having this configuration, by rotating the washer 9 integrally with the retaining member 7, the sliding between the retaining member 7 and the washer 9 is suppressed, the uneven rotation of the electric motor is eliminated, and the rotational speed is increased. In addition to making it uniform, the retaining member 7
The generation of sliding noise between the washer 9 and washer 9 is suppressed.

In addition, in a motor bearing device using such an oil-impregnated bearing 8, minute irregularities are provided on the end face 8a of the oil-impregnated bearing 8, and the washer 9 slides relative to the irregularities on the end face 8a. The dynamic pressure of the lubricating oil generated between the bearings is used to reduce friction and wear caused by thrust force, thereby extending the life of the bearing device. Note that this type of technology is also published in Japanese Patent Application Laid-Open No. 12121/1983.

[0009]

However, in the conventional electric motor bearing device as described above, even in the bearing device using the oil-impregnated bearing 8, a retaining member 7 dedicated to the ball bearing 3 is used. Since the extending portion 7a of the retaining member 7 and the cut-out portion 9a of the washer 9 are engaged, and the washer 9 and the retaining member 7 are rotated together, the end face 8a of the oil-impregnated bearing 8 and the washer 9 are rotated together. There were cases where there was a large difference in the sliding contact area between the two. That is, the diameter M of the washer 9 sometimes became extremely small compared to the diameter L of the end surface 8a of the oil-impregnated bearing 8 (see FIG. 7).

Therefore, the dynamic pressure of the lubricating oil generated between the end face 8a of the oil-impregnated bearing 8 and the washer 9 has not been effectively utilized. That is, the dynamic pressure of the lubricating oil generated between the end face 8a of the oil-impregnated bearing 8 and the washer 9 is utilized to the maximum,
In order to reduce friction and wear due to thrust force, unevenness is provided over the entire end surface 8a of the oil-impregnated bearing 8, and
It was desirable to slide the washer 9 over the entire end face 8a of the oil-impregnated bearing 8.

Therefore, the present invention provides an electric motor that can use a standard retaining member made for ball bearings and that can effectively utilize the dynamic pressure of lubricating oil generated between the end face of the oil-impregnated bearing and the washer. The object of the present invention is to provide a bearing device.

0012

[Means for Solving the Problems] The present invention provides an oil-impregnated bearing that pivotally supports a rotating shaft, a retaining member attached to the outside of the oil-impregnated bearing of the rotating shaft, and a retaining member interposed between the oil-impregnated bearing and the retaining member. The oil-impregnated bearing includes a washer that can be brought into sliding contact with substantially the entire end surface of the oil-impregnated bearing, and an engaging means that engages the retaining member and the washer so that they rotate together.

[0013]

[Operation] In the electric motor bearing device of the present invention, a retaining member is attached to the rotating shaft 1 located outside the oil-impregnated bearing.
A washer interposed between this retaining member and the oil-impregnated bearing is
Since it is capable of slidingly contacting substantially the entire end face of the oil-impregnated bearing, and the engaging means engages the washer and the retaining member,
The washer and the retaining member rotate as one, suppressing sliding between the retaining member and the washer, eliminating uneven rotation of the motor, and using a standard retaining member made for ball bearings. Moreover, by making full use of the dynamic pressure of the lubricating oil generated between the end face of the oil-impregnated bearing and the washer,
Friction and wear caused by thrust force can be reduced.

[0014]

[Embodiments] Each embodiment of the present invention will be explained below.

First Embodiment FIG. 1 is a sectional view showing a bearing device for an electric motor according to a first embodiment of the present invention, and FIG. 2 is a plan view showing the bearing device for an electric motor shown in FIG. In the drawings, the same reference numerals and symbols as those in the above conventional example indicate constituent parts that are the same as or correspond to those in the above conventional example.

In the figure, reference numeral 10 denotes a sheet metal washer interposed between the oil-impregnated bearing 8 and the retaining member 7, and an axial force (thrust force) applied to the oil-impregnated bearing 8 acts on this washer 10. In addition, this washer 10 also has a half-pull part 10.
a is formed, and this half-pull part 10a engages with the extension part 7a of the retaining member 7, and the washer 10 and the retaining member 7 rotate together. In this embodiment, the diameter L of the end surface 8a of the oil-impregnated bearing 8 and the diameter M of the washer 10 are approximately equal, and there is no large difference in the sliding contact area between the washer 10 and the end surface 8a of the oil-impregnated bearing 8.

[0017] Also in the bearing device of the electric motor having this configuration,
By rotating the washer 10 integrally with the retaining member 7, sliding movement between the retaining member 7 and the washer 10 can be suppressed, and uneven rotation of the electric motor can be eliminated.

Furthermore, since the washer 10 interposed between the oil-impregnated bearing 8 and the retaining member 7 is configured to be able to come into sliding contact with substantially the entire surface of the end surface 8a of the oil-impregnated bearing 8, the end surface 8a of the oil-impregnated bearing 8 is By providing unevenness over the entire surface, the washer 10 can be slid over the entire surface of the end surface 8a of the oil-impregnated bearing 8. Therefore, the end face 8a of the oil-impregnated bearing 8 and the washer 1
It is possible to effectively utilize the dynamic pressure of the lubricating oil generated between the 0 and 0, and reduce friction and wear caused by thrust force.

As described above, the electric motor bearing device of this embodiment includes the oil-impregnated bearing 8 that pivotally supports the rotating shaft 1, the retaining member 7 attached to the outside of the oil-impregnated bearing 8 of the rotating shaft 1, and the oil-impregnated bearing 8. 8 and the retaining member 7, and is capable of slidingly contacting substantially the entire surface of the end surface 8a of the oil-impregnated bearing 8; and a washer 10 that engages the retaining member 7 and the washer 10 so that they rotate together. The engagement means includes a half-pull-out portion 10a and an extending portion 7a of the retaining member 7.

That is, in this embodiment, the retaining member 7 is attached to the rotating shaft 1 located outside the oil-impregnated bearing 8, and the washer 10 interposed between the retaining member 7 and the oil-impregnated bearing 8 The half-pull portion 10a of the washer 10 and the extending portion 7a of the retaining member 7 engage with each other.

[0021] Therefore, the washer 10 and the retaining member 7 rotate together, suppressing the sliding movement between the retaining member 7 and the washer 10, and eliminating uneven rotation of the electric motor, thereby making the rotation speed uniform. At the same time, the generation of sliding noise between the retaining member 7 and the washer 10 can be suppressed. Moreover, since the standard retaining member 7 made for ball bearings can be used, the retaining member 7 of stable quality can be obtained at low cost. Furthermore, the end face 8a of the oil-impregnated bearing 8 and the washer 1
By making full use of the dynamic pressure of lubricating oil generated between
Since friction and wear caused by thrust force can be effectively reduced, the life of the bearing device can be extended.

Second Embodiment FIG. 3 is a sectional view showing a bearing device for an electric motor according to a second embodiment of the present invention, and FIG. 4 is a plan view showing the bearing device for an electric motor shown in FIG. In the drawings, the same reference numerals and symbols as those in the conventional example and the first embodiment indicate constituent parts that are the same as or correspond to those in the conventional example and the first embodiment.

In the figure, 11 is a sheet metal washer interposed between the oil-impregnated bearing 8 and the retaining member 7, and an axial force (thrust force) applied to the oil-impregnated bearing 8 acts on this washer 11. Further, this washer 11 has a bent portion 11.
This bent portion 11a engages with the extension portion 7a of the retaining member 7, and the washer 11 and the retaining member 7 rotate together. In addition, in this embodiment as well, the diameter L of the end face 8a of the oil-impregnated bearing 8 and the diameter M of the washer 10 are approximately equal, and the washer 11 and the oil-impregnated bearing 8
There is no large difference in the sliding contact area with the end surface 8a.

[0024] Also in the bearing device of the electric motor having this configuration,
By rotating the washer 11 integrally with the retaining member 7, sliding between the retaining member 7 and the washer 11 can be suppressed, and uneven rotation of the electric motor can be eliminated.

Furthermore, since the washer 11 interposed between the oil-impregnated bearing 8 and the retaining member 7 is configured to be able to come into sliding contact with substantially the entire surface of the end surface 8a of the oil-impregnated bearing 8, the end surface 8a of the oil-impregnated bearing 8 is By providing unevenness over the entire surface, the washer 11 can be slid over the entire surface of the end surface 8a of the oil-impregnated bearing 8. Therefore, the end face 8a of the oil-impregnated bearing 8 and the washer 1
It is possible to effectively utilize the dynamic pressure of the lubricating oil generated between the thrust force and the thrust force, thereby reducing friction and wear caused by thrust force.

As described above, the electric motor bearing device of this embodiment includes the oil-impregnated bearing 8 that pivotally supports the rotary shaft 1, the retaining member 7 attached to the outside of the oil-impregnated bearing 8 of the rotary shaft 1, and the oil-impregnated bearing 8. 8 and the retaining member 7, the washer 11 is capable of slidingly contacting substantially the entire surface of the end surface 8a of the oil-impregnated bearing 8, and the washer 11 engages with the retaining member 7 and the washer 11 so that they rotate together. and an engaging means consisting of a bent portion 11a and an extending portion 7a of the retaining member 7.

That is, in this embodiment, the retaining member 7 is attached to the rotating shaft 1 located outside the oil-impregnated bearing 8, and the washer 11 interposed between the retaining member 7 and the oil-impregnated bearing 8 The bent portion 11a of the washer 11 and the extending portion 7a of the retaining member 7 engage with each other.

[0028] Therefore, the washer 10 and the retaining member 7 rotate together, suppressing the sliding movement between the retaining member 7 and the washer 11, and eliminating uneven rotation of the electric motor, thereby making the rotational speed uniform. At the same time, the generation of sliding noise between the retaining member 7 and the washer 11 can be suppressed. Moreover, since the standard retaining member 7 made for ball bearings can be used, the retaining member 7 of stable quality can be obtained at low cost. Furthermore, the end face 8a of the oil-impregnated bearing 8 and the washer 1
By making the most of the dynamic pressure of lubricating oil generated between
Since friction and wear caused by thrust force can be effectively reduced, the life of the bearing device can be extended.

[0029]

As explained above, the bearing device for an electric motor of the present invention includes an oil-impregnated bearing that pivotally supports a rotating shaft, a retaining member, a washer, and an engaging means, and is located outside the oil-impregnated bearing. A retaining member is attached to the rotating shaft, and a washer interposed between the retaining member and the oil-impregnated bearing can slide on substantially the entire end surface of the oil-impregnated bearing, and the washer and the retaining member are connected by an engaging means. By engaging, the washer and the retaining member rotate together, suppressing sliding between the retaining member and the washer, and eliminating uneven rotation of the electric motor.
The number of rotations can be made uniform, the sliding noise between the retaining member and the washer can be suppressed, and a standard retaining member made for ball bearings can be used, making it possible to obtain a retaining member of stable quality at a low cost. In addition, the dynamic pressure of the lubricating oil generated between the end face of the oil-impregnated bearing and the washer can be fully utilized to reduce friction and wear caused by thrust force, thereby extending the life of the bearing device. It is possible to promote

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a bearing device for an electric motor according to a first embodiment of the present invention.

FIG. 2 is a plan view showing the bearing device of the electric motor shown in FIG. 1;

FIG. 3 is a sectional view showing a bearing device for an electric motor according to a second embodiment of the present invention.

FIG. 4 is a plan view showing the bearing device of the electric motor shown in FIG. 3;

FIG. 5 is a sectional view showing a conventional bearing device for an electric motor.

FIG. 6 is a plan view showing the bearing device of the electric motor shown in FIG. 5;

FIG. 7 is a sectional view showing another conventional electric motor bearing device.

8 is a plan view showing the bearing device of the electric motor of FIG. 7. FIG.

[Explanation of symbols]

1 Rotation axis 2 Bearing holding member 7. Removal prevention member 7a Extending part 8 Oil-impregnated bearing 8a End face 10 Washer 10a Half-cut part 11 Washer 11a　　　　　　　　　Bending part

Claims (1)

[Claims] 1. An oil-impregnated bearing that pivotally supports a rotating shaft, a retaining member attached to the outer side of the oil-impregnated bearing of the rotary shaft, and an oil-impregnated bearing interposed between the oil-impregnated bearing and the retaining member, and an oil-impregnated bearing having an approximate diameter of the end face of the oil-impregnated bearing. A bearing device for an electric motor, comprising: a washer that can be slidably contacted over the entire surface; and an engaging means that engages the retaining member and the washer so that they rotate together.