KR101749552B1 - Motor - Google Patents

Abstract

A bearing fixed to the inside of the stator and having a bearing mounting portion at both ends thereof; a shaft installed to penetrate the housing; a bearing rotatably supporting the shaft and inserted into the bearing mounting portion; And an oil guide which is installed at both ends and forms an internal space together with the housing, and an oil guide fixed to the bearing mounting part and guiding a flow path of the oil filled in the space formed by the housing and the frame. do.

Description

[0001]

The present invention relates to an electric motor.

In the vertical type motor, the upper bearing of the motor receiving high load uses oil instead of general grease as lubricating oil. This is to reduce the temperature of the bearing by circulating the oil between the bearings in order to suppress the temperature rise of the bearing due to the large load acting on the bearings.

Then, the oil having a high temperature is allowed to transfer heat to the outside through the frame again, thereby lowering the oil temperature.

However, when a larger load is applied to the bearing, a space for accommodating the oil is expanded or a water jacket is installed in the oil bath to cool the oil. However, in this case, the manufacturing cost is increased.

Therefore, it is necessary to develop a structure capable of suppressing an increase in the temperature of the bearing even when a larger load is applied to the bearing while suppressing an increase in manufacturing cost.

Korean Patent Publication No. 2012-0003205

An electric motor capable of suppressing the temperature rise of the bearing is provided.

According to an embodiment of the present invention, there is provided an electric motor including a housing having a stator fixedly installed therein and having bearing mounting portions at both ends thereof, a shaft installed to penetrate the housing, A frame which is installed at both ends of the housing and forms an internal space together with the housing, and a flow path of oil filled in the space formed by the housing and the frame, And a guide oil guide.

The oil guide may include a plate portion having a through hole at a center portion thereof and an extension portion extending in the axial direction from an edge of the plate portion.

The inner diameter side bottom surface of the plate portion may be attached to the upper surface of the bearing installation portion.

A circulation hole for circulating oil may be formed at a lower end of the bearing installation part.

The flow rate of the oil can be increased by the space formed in the oil guide and the frame.

The temperature rise of the bearing can be suppressed.

1 is a schematic cross-sectional view showing an upper end portion of an electric motor according to an embodiment of the present invention.
2 is a perspective view illustrating an oil guide included in an electric motor according to an embodiment of the present invention.
3 is a partially cutaway perspective view illustrating an oil guide provided in an electric motor according to an embodiment of the present invention.
4 is an explanatory view for explaining the operation of the electric motor according to the embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. The shape and size of elements in the drawings may be exaggerated for clarity.

FIG. 1 is a schematic cross-sectional view illustrating an upper end portion of an electric motor according to an embodiment of the present invention. FIG. 2 is a perspective view illustrating an oil guide included in an electric motor according to an embodiment of the present invention. FIG. 4 is an explanatory view for explaining the operation of the electric motor according to the embodiment of the present invention. FIG. 4 is a partially cutaway perspective view showing an oil guide provided in the electric motor according to the example.

1 to 4, an electric motor 100 according to an embodiment of the present invention includes a housing 110, a shaft 120, a bearing 130, a frame 140, and an oil guide 150, As shown in FIG.

The housing 110 has a stator (not shown) fixedly installed therein and a bearing mounting portion 112 at both ends. For example, a stator (a stator core in which a coil is wound) is fixedly installed on the inner surface of the housing 110, and the shaft 120 can be installed to penetrate the housing 110.

The bearing mounting portion 112 may have a hollow circular shape and extend in the axial direction. A circulation hole 112a for circulating oil is formed at the lower end of the bearing installation part 112. [

The bearing mounting portion 112 may extend from the upper surface of the upper lid portion 114 constituting the housing 110. A side wall portion 114a is formed at an edge of the upper lid portion 114 to form an oil receiving portion 102 in which the frame 140 and the oil are received.

The shaft 120 is formed to penetrate through the housing 110 and may include a driving magnet (not shown) for rotating the shaft 120 by electromagnetic interaction with the stator. The drive magnet may be installed on the outer circumferential surface of the shaft 120, and may have a circular ring shape in which N and S poles are alternately magnetized in a circumferential direction.

On the other hand, the shaft 120 can be rotatably supported by the bearing 130.

As described above, the bearing 130 rotatably supports the shaft 120, is fixed to the bearing mounting portion 114, and may be formed of two ball bearings stacked one above the other.

The frame 140 is installed at both ends of the housing 110 to form an inner space together with the housing 110. More specifically, the side wall portion 114a extending from the upper surface of the upper lid portion 114 constituting the housing 110 forms the oil receiving portion 102 in which the oil together with the frame 140 is received.

The oil guide 150 is fixed to the bearing mounting portion 112 to provide a flow path of the oil filled in the oil receiving portion 102 formed by the housing 110 and the frame 140.

2 and 3, the oil guide 150 includes a plate portion 152 in which a through hole 152a is formed, an extension extending downward in the axial direction from an edge of the plate portion 152, And may have a portion 154 formed thereon.

The inner diameter side of the plate portion 152 is joined to the upper surface of the bearing mounting portion 112 so that the oil guide 150 is fixed to the bearing mounting portion 112.

In this way, when the oil guide 150 is installed on the bearing mounting portion 112, the oil flows into the gap formed by the plate portion 152 and the frame 140 as shown in FIG. That is, the flow path of the oil is narrowed as compared with the case where the oil guide 150 is not provided.

Accordingly, the flow velocity of the oil can be increased to increase the circulation velocity of the oil. That is, the oil guide 150 plays a role of increasing the flow rate of the oil to smoothly flow the oil. Accordingly, the heat transfer through the oil can be performed more quickly, and the temperature rise of the bearing can be suppressed.

As described above, the circulation of the oil is facilitated through the oil guide 150, so that the heat transfer through the oil can be performed more quickly. As a result, the temperature rise of the bearing can be suppressed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be obvious to those of ordinary skill in the art.

100: electric motor
110: Housing
120: shaft
130: Bearings
140: frame
150: Oil guide

Claims (5)

A housing having a stator fixedly installed therein and having bearing mounting portions at both ends thereof;
A shaft installed to penetrate the housing;
A bearing rotatably supporting the shaft and inserted into the bearing mounting portion;
A frame installed at both ends of the housing to form an inner space together with the housing; And
An oil guide fixed to the bearing mounting portion and guiding a flow path of the oil filled in the space formed by the housing and the frame;
/ RTI >
Wherein the oil guide includes a plate portion having a through hole at a center portion thereof and an extension portion extending in an axial direction from an edge of the plate portion.
delete The method according to claim 1,
And an inner diameter side bottom surface of the plate portion is joined to an upper surface of the bearing installation portion.
The method according to claim 1,
And a circulation hole for circulating oil is formed in a lower end portion of the bearing installation portion.
The method according to claim 1,
Wherein a flow velocity of the oil is increased by a gap formed by the oil guide and the frame.

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