KR100626735B1 - Construction for supporting bearings for a rotation shaft of an electric motor - Google Patents

Abstract

Disclosed is a bearing support structure for a rotating shaft of an electric motor. The bearing support structure of the rotating shaft of the electric motor can be stored in the first annular groove of the lower surface of the thrust bearing in which the lubricant is in contact with each other, and in the second annular groove of the first shoulder surface of the bearing housing, in exhaustion or crevice due to frictional heat. Leakage and the like are prevented. Therefore, since the lubricant for lubricating the thrust bearing is not exhausted, rotation of the thrust bearing is more smooth, and vibration and noise are prevented. In addition, since the member is saved, manufacturing cost is reduced.

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Description

The bearing support structure of the rotating shaft of an electric motor{CONSTRUCTION FOR SUPPORTING BEARINGS FOR A ROTATION SHAFT OF AN ELECTRIC MOTOR}

1 is a schematic side cross-sectional view of a typical electric motor having a bearing support structure,

Figure 2 is a partially enlarged side sectional view of a conventional bearing support structure,

3 is an enlarged perspective view showing a friction portion in the bearing support structure of FIG. 2,

4 is a partially enlarged side cross-sectional view of a bearing support structure according to an embodiment of the present invention, and

5 is an enlarged plan view and side cross-sectional view showing an enlarged friction portion in the bearing support structure of FIG. 4.

* Explanation of symbols for the main parts of the drawing *

10, 100: bearing support structure 11: bearing housing

12: radial bearing 13: thrust plate

14: thrust bearing 15: retainer ring

16: rotating shaft 17: first friction surface

18: second friction surface 20, 120: stator

30: rotor 111: annular upper surface

112: first cylindrical surface 113: first shoulder surface

114: second cylindrical surface 115: second shoulder surface

116: first annular groove 141: top surface

142: outer surface 143: lower surface

144: fixing portion 147: second annular groove

The present invention relates to an electric motor for converting electrical energy into mechanical energy, in particular, to prevent the lubricant for lubrication of the thrust bearings from being exhausted, making the thrust bearings rotate more smoothly, thereby ensuring smooth operation, vibration and noise, etc. The present invention relates to a bearing support structure of a rotating shaft of an electric motor that can prevent and further reduce a manufacturing cost by reducing a member.

A motor is a device for converting electrical energy into mechanical energy, and includes a stator, a rotor, and a rotating shaft integrally coupled to the rotor and rotating. Since the rotating shaft of the electric motor rotates at a very high speed, there is a characteristic that wear tends to occur in structures such as bearings supporting it.

1 and 2 are schematic side cross-sectional views of a typical electric motor having a bearing support structure and partially enlarged side cross-sectional views of a conventional bearing support structure.

As shown, in the conventional bearing support structure 10, a radial bearing 12 supporting the radial load of the rotating shaft 16 is fixed to the radially inner side of the bearing housing 11 and thrusted. A thrust plate 13 is fixed to the top of the bearing housing 11. The bearing housing 11, the radial bearing 12 and the thrust plate 13 constitute a stator 20 that does not rotate even while the rotating shaft 16 rotates. The upper surface of the thrust plate 13 forms a second friction surface 18 as shown in FIG. 3.

On the other hand, a ring groove 51 having an annular shape extending along its circumferential direction is formed at a predetermined position on the outer surface of the rotating shaft 16, and a so-called E-ring is formed in the ring groove 51. The retainer ring 15, which is called, is firmly fitted so as not to escape. The retainer ring 15 is coupled with a thrust bearing 14 on one side, and the retainer ring 15 and the thrust bearing 14 are integrally coupled to each other so as to abut each other up and down. The lower surface of the thrust bearing 14 forms a first friction surface 17 as shown in FIG. 3, and is supported against the second friction surface 18 of the thrust plate 13 of the stator 20. Here, the retainer ring 15, the thrust bearing 14, and the rotating shaft 16 constitute the rotor 30 of the electric motor.

In the conventional bearing support structure 10 as described above, when the rotating shaft 16 rotates during operation of the electric motor, the retainer ring 15 and the thrust bearing 14 constituting the rotor 30 together therewith are provided. While rotating together, the bearing housing 11, the radial bearing 12 and the thrust plate 13 constituting the stator 20 are not rotated. Therefore, since the first friction surface 17 of the rotating thrust bearing 14 rotates at a high speed in contact with the second friction surface 18 of the non-rotating thrust plate 13, it is very large between the two surfaces. Friction occurs.

The thrust plate 13 may be said to be a member against such friction, and lubricant is regularly injected between the two surfaces to lubricate the friction between the first friction surface 17 and the second friction surface 18. .

However, even if lubricating oil is injected between the first friction surface 17 and the second friction surface 18, because the rotating shaft 16 and the thrust bearing 14 fixed thereto rotate at a high speed, the electric motor for a predetermined time or longer In the case of driving, there has been a problem that the lubricating oil is exhausted due to friction heat or the like, or leaks into the gap. When the lubricating oil is exhausted as described above, the thrust bearing 14 exhibits problems such as wear, vibration, noise, or an abnormal load on the electric motor.

In addition, the thrust plate 13 is a member against the above-described friction, there is a problem that increases the required material of the entire motor and increases the manufacturing cost accordingly.

The present invention has been devised to overcome the problems of the prior art as described above, and accordingly, the object of the present invention is to prevent the lubricant for lubrication of the thrust bearing from being exhausted, thereby smoothly rotating the thrust bearing and smoothly operating accordingly. It is to provide a bearing support structure of the rotating shaft of the electric motor that can not only guarantee but also prevent vibration and noise.

Another object of the present invention is to provide a bearing support structure of a rotating shaft of an electric motor that can smoothly rotate a thrust bearing and reduce a member, thereby reducing manufacturing costs.

In order to achieve the above object, the bearing support structure of the rotating shaft of the electric motor provided by the present invention is in the bearing supporting structure of the rotating shaft of the electric motor for converting electrical energy into mechanical energy,
A radial bearing for supporting a radial load of the rotating shaft,
A thrust bearing fixed to the rotating shaft so as to support the axial load of the rotating shaft,
The radial bearing is fixed, and includes a bearing housing in which the outer and lower surfaces of the thrust bearing are supported and contacted,
It is characterized in that at least one annular groove into which lubricant is injected is formed on at least one of the surfaces of the bearing housing in contact with the lower surface of the thrust bearing and the lower surface of the thrust bearing.

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Hereinafter, the bearing support structure 100 of the rotating shaft of the electric motor according to the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

4 is a partially enlarged side cross-sectional view of the bearing support structure 100 according to an embodiment of the present invention, and FIG. 5 is a plan and side cross-sectional view showing an enlarged friction portion in the bearing support structure 100 of FIG. 4. In the following description, similar members will be described with the same reference numerals.

As shown, the bearing support structure 100 of the rotating shaft of the electric motor according to an embodiment of the present invention, the rotating shaft 16, the radial bearing 12 for supporting the radial load of the rotating shaft 16, It includes a thrust bearing (14) for supporting the axial load of the rotating shaft (16), and a bearing housing (11) for supporting the radial bearing (12) and the thrust bearing (14).

At a predetermined position on the outer surface of the rotating shaft 16, an annular ring groove 51 extending along the circumferential direction is formed, and a retainer ring 15, so-called E-ring, is not deviated from the ring groove 51. So that it is tightly fitted. The retainer ring 15 is coupled to the thrust bearing 14 on one side, and the retainer ring 15 and the thrust bearing 14 are integrally coupled to each other so as to make vertical contact. That is, the thrust bearing 14 has an upper surface 141, a cylindrical outer surface 142, and a lower surface 143, wherein the fixing portion 144 protrudes upward from one side of the upper surface 141, and the retainer ring 15 ) Is assembled to the fixing part 144 by fitting or the like, and the retainer ring 15 and the thrust bearing 14 are integrally coupled to each other so as to contact each other up and down.
5, the lower surface 143 of the thrust bearing 14 is mounted on the first shoulder surface 113 of the bearing housing 11 and is brought into contact friction with the first shoulder surface 113. Here, the retainer ring 15, the thrust bearing 14, and the rotating shaft 16 constitute the rotor 30 of the electric motor.

On the other hand, the bearing housing 11 has an inner surface of a double stepped shape. That is, the bearing housing 11 includes an annular upper surface 111 extending horizontally radially inward from the top of its cylindrical outer surface, and a first cylindrical surface 112 extending downward from the inner end of the annular upper surface 111, A first shoulder surface 113 extending horizontally radially inward from the bottom of the first cylindrical surface 112, a second cylindrical surface 114 extending downward from the inner end of the first shoulder surface 113, and It has a second shoulder surface 115 that extends horizontally in the radial direction from the bottom of the second cylindrical surface 114.

In the bearing housing 11 having such a shape, the radial bearing 12 is fixed to the second cylindrical surface 114, and thus the radial bearing 12 is accommodated in the bearing housing 11 and at the same time. (11). The radial bearing 12 and the bearing housing 11 constitute a stator 120 that does not rotate even while the rotating shaft 16 rotates. The lower surface of the thrust bearing 14 described above is brought into contact with the first shoulder surface 113 to be rubbed, and the first cylindrical surface 112 of the rotating shaft 16 to which the thrust bearing 14 and the thrust bearing 14 are fixed is fixed. Limit radial movement or movement.

In addition, when the assembly of the bearing support structure 100 of the rotating shaft of the electric motor according to the present invention is completed, the lower surface 143 of the thrust bearing 14 is disposed on the first shoulder surface 113 of the bearing housing 11 It becomes contact friction.

On the other hand, in Fig. 5, the bearing housing 11 and the thrust bearing 14 for showing in detail the first shoulder surface 113 of the bearing housing 11 and the lower surface 143 of the thrust bearing 14 which are in contact with each other and rubbing. ).
As shown, two first annular grooves 147 and two second annular grooves 116 are concentrically formed on the lower surface 143 and the first shoulder surface 113 of the bearing 14, respectively. It is. It is more preferable that the diameters of the first annular groove 147 and the second annular groove 116 do not coincide with each other. Depending on the embodiment, the first annular groove 147 and the second annular groove 116 may be formed eccentrically with each other.

When the bearing support structure 100 of the rotating shaft of the electric motor according to the present invention having the above structure is completely assembled as shown in FIG. 4, when the rotating shaft 16 rotates during operation of the electric motor, the The retainer ring 15 and the thrust bearing 14 constituting the rotor 30 together rotate while the bearing housing 11 and the radial bearing 12 constituting the stator 120 do not rotate. do. Therefore, since the lower surface 143 of the rotating thrust bearing 14 rotates at a high speed in contact with the first shoulder surface 113 of the non-rotating bearing housing 11, very large friction occurs between the two surfaces. do.

At this time, a lubricant is injected between the lower surface 143 of the bearing 14 and the first shoulder surface 113 to reduce friction. This lubricant is the lower surface 143 of the bearing 14 and the first shoulder surface ( 113) can be stored in the first annular groove 147 and the second annular groove 116 formed in each, thereby preventing or delaying exhaustion due to frictional heat or leakage in the gap. On the other hand, when the first annular groove 147 and the second annular groove 116 are formed to have different diameters as described above, the lower surfaces of the first shoulder surface 113 and the bearings 14 opposite to each other It becomes possible to provide a greater lubrication effect to 143.

In addition, unlike the conventional bearing support structure 10, the bearing support structure 100 of the rotating shaft of the electric motor according to the present invention does not require the thrust plate 13 of FIG. 2, thereby reducing members.

As described above, the bearing support structure of the rotating shaft of the electric motor according to the embodiment of the present invention includes: a first annular groove of a lower surface of a thrust bearing in which lubricating oil contacts each other, and a second annular groove of a first shoulder surface of a bearing housing It can be preserved within, so that exhaustion due to frictional heat or leakage in the gap is prevented. Therefore, since the lubricant for lubricating the thrust bearing is not exhausted, rotation of the thrust bearing is more smooth, and vibration and noise are prevented.

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In addition, since the member is saved, manufacturing cost is reduced.

In the above, a preferred embodiment of the present invention has been described in detail with reference to the accompanying drawings, but the present invention is not limited to these embodiments, and various modifications, modifications, and additions are within the scope of the spirit defined by the claims. It is apparent to those skilled in the art to which the present invention pertains.

Claims (4)

In the bearing support structure of the rotating shaft of the electric motor for converting electrical energy into mechanical energy, A radial bearing for supporting a radial load of the rotating shaft, A thrust bearing fixed to the rotating shaft to support an axial load of the rotating shaft, The radial bearing is fixed, and includes a bearing housing in which the outer and lower surfaces of the thrust bearing are supported and contacted, A bearing support structure of a rotating shaft of an electric motor, characterized in that at least one annular groove into which lubricant is injected is formed on at least one of the surface of the bearing housing in contact with the lower surface of the thrust bearing and the lower surface of the thrust bearing. According to claim 1, The bearing housing extends downward from the inner end of the annular upper surface and the annular upper surface and a first cylindrical surface that restricts the thrust bearing from moving in the radial direction of the rotating shaft, radially inward from the lower end of the first cylindrical surface A first shoulder surface extending horizontally and contacting a lower surface of the thrust bearing, a second cylindrical surface extending downward from an inner end of the first shoulder surface, and fixed to the radial bearing, and a lower end of the second cylindrical surface A bearing support structure comprising a second shoulder surface extending horizontally inward from the radial direction. The method of claim 1 or 2, At least one first annular groove and a second annular groove are respectively formed on the lower surface of the thrust bearing and the first shoulder surface, The first annular groove and the second annular groove have a bearing support structure of the rotating shaft of the electric motor, characterized in that different diameters. The method of claim 3, An annular ring groove extending along the circumferential direction is formed at a predetermined position on the outer surface of the rotating shaft, A retainer ring is firmly fitted in the ring groove, The retainer ring is in contact with the upper surface of the thrust bearing and is integrally coupled with the thrust bearing to support the thrust bearing from the upper side, the bearing support structure of the rotating shaft of the electric motor.

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