Motor housing and motor including same

The present invention provides a housing of a motor including a bearing pocket portion which is formed to protrude from an inner lower portion of the housing and in which an accommodation space of a bearing configured to support a shaft is formed and a shaft hole through which the shaft passes is formed in a bottom surface thereof, wherein the bearing pocket portion includes a stepped portion, the stepped portion protrudes upward along a circumference of the shaft hole, and an accommodation groove is formed between the stepped portion and an inner wall of the bearing pocket portion, thereby providing an advantageous effect of preventing foreign materials discharged from the housing of the motor, the wave washer, the bearing, and the like from exiting through the shaft hole.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is the U.S. national stage application of International Patent Application No. PCT/KR2015/014079, filed Dec. 22, 2015, which claims priority to Korean Application No. 10-2015-0009434, filed Jan. 20, 2015, the disclosures of each of which are incorporated herein by reference in their entirety.

TECHNICAL FIELD

The present invention relates to a motor housing and a motor including the same, and more particularly, to a motor housing including a bearing pocket portion configured to accommodate a bearing and a motor including the same.

BACKGROUND ART

Motors are apparatuses which convert electrical energy into rotational energy using a force received by a conductor in a magnetic field. Recently, as a use of the motor expands, a role of the motor becomes important. Particularly, as the number of electrical devices in vehicles rapidly increases, demand for the motor applied to a steering system, a braking system, a safety critical system, and the like is greatly increasing.

Particularly, a case in which an external force is applied to a motor in a direction of a shaft is increasing. Accordingly, motors combined with a bearing configured to support a load in a direction of a shaft, such as an angular bearing, and a wave washer have been suggested.

However, when vibrations are continuously applied to a motor and the motor is repeatedly driven, abraded materials may be discharged from a motor housing, a wave washer, a bearing, and the like. In the case in which such abraded materials exit the motor to the outside, the abraded materials may fatally affect the performance of a driving apparatus, a measurement apparatus, or other application apparatuses, such as a gear or sensor, adjacent to the motor. Particularly, in the case in which the abraded materials come into contact with the sensor, there may be a problem in that driving of the motor is delayed or the motor is not driven.

DISCLOSURE

Technical Problem

The present invention is directed to a motor housing capable of preventing foreign materials discharged from the motor housing, a wave washer, a bearing, and the like from exiting the motor to the outside and a motor including the same

Particularly, the present invention is also directed to a motor housing including a bearing and a wave washer installed therein to prevent foreign materials from exiting a bearing pocket portion, in which many foreign materials are generated, to the outside through a shaft hole, and a motor including the same.

The scope of the present invention is not limited to the above-described objects, and other unmentioned objects may be clearly understood by those skilled in the art from the following descriptions

Technical Solution

One aspect of the present invention provides a housing of a motor including a bearing pocket portion which is formed to protrude from an inner lower portion of the housing and in which an accommodation space of a bearing configured to support a shaft is formed and a shaft hole through which the shaft passes is formed in a bottom surface thereof, wherein the bearing pocket portion includes a stepped portion, the stepped portion protrudes upward along a circumference of the shaft hole, and an accommodation groove is formed between the stepped portion and an inner wall of the bearing pocket portion.

The bottom surface of the bearing pocket portion forming the accommodation groove may be formed with at least two stepped surfaces in a radial direction.

An innermost stepped surface closest to the shaft hole, among the stepped surfaces, may be formed in a flat shape to be in contact with a wave washer.

The stepped surfaces may be formed in annular shapes and gradually lowered in the radial direction.

Grooves may be concavely formed in the stepped portion in a circumferential direction to be spaced a predetermined distance from each other such that a depth of each of the grooves is equal to a height of the stepped surface.

The innermost stepped surface may have a saw tooth shape.

Another aspect of the present invention provides a motor including a housing, a stator coupled to the housing, a rotor disposed inside the stator, a shaft coupled to the rotor, and a bearing pocket portion which is formed to protrude from an inner lower portion of the housing and in which an accommodation space of a bearing configured to support the shaft is formed and a shaft hole through which the shaft passes is formed in a bottom surface thereof, wherein the bearing pocket portion includes a stepped portion, the stepped portion protrudes upward along a circumference of the shaft hole, and an accommodation groove is formed between the stepped portion and an inner wall of the bearing pocket portion.

The bottom surface of the bearing pocket portion forming the accommodation groove may be formed with at least two stepped surfaces in a radial direction.

An innermost stepped surface closest to the shaft hole, among the stepped surfaces, may be formed in a flat shape to be in contact with a wave washer.

The stepped surfaces may be formed in annular shapes and gradually lowered in the radial direction.

Grooves may be concavely formed in an upper surface of the stepped portion in a circumferential direction to be spaced a predetermined distance from each other such that a depth of each of the grooves is equal to a height of the innermost stepped surface.

The stepped portion may have a saw tooth shape.

The motor may further includes a bearing inserted into the bearing pocket portion and a sealing member disposed between an inner wall of the bearing pocket portion and the bearing.

The bearing may include a sealing groove which is concavely formed in a circumference of a side of an outer race and into which the sealing member is inserted.

Advantageous Effects

According to one embodiment of the present invention, since a stepped portion which defines an accommodation groove around a shaft hole of a bearing pocket portion is provided, there is an advantageous effect in that foreign materials discharged from a motor housing, a wave washer, a bearing, and the like can be prevented from exiting the outside through a shaft hole.

In addition, according to one embodiment of the present invention, since a bottom surface of a bearing pocket portion is formed to have a double step structure in a radial direction, there are advantageous effects in that a seating space of a wave washer is secured and an accommodation groove is also formed.

In addition, according to one embodiment of the present invention, since a stepped portion is formed in a saw tooth shape to trap foreign materials in grooves between saw teeth, there is an advantageous effect in that foreign materials are effectively prevented from exiting through a shaft hole.

MODES OF THE INVENTION

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Purposes, specific advantages, and novel features of the present invention will be made clear from the exemplary embodiments and the following detailed description in connection with the accompanying drawings. Terms and words used in this specification and claims thereof are not to be interpreted as limited to commonly used meanings or meanings in dictionaries, and should be interpreted as having meanings and concepts which are consistent with the technological scope of the present invention based on the principle that the inventors have appropriately defined concepts of terms in order to describe the present invention in the best way. In the description of the present invention, when it is determined that detailed descriptions of related well-known functions unnecessarily obscure the gist of the present invention, the detailed descriptions will be omitted.

FIG. 1is a view illustrating a motor according to an exemplary embodiment of the present invention.

Referring toFIG. 1, the motor according to the embodiment of the present invention may include a housing100, a stator200, a rotor300, and a shaft400.

The housing100is formed in a cylindrical shape and provided with a space in which the stator200and the rotor300may be installed. Here, a shape and a material of the housing100may be variously changed, and a metal material capable of withstanding a high temperature may be selected for the housing100because the housing is installed in a vehicle. In addition, the housing100may be formed to shield the stator200and the rotor300from the outside.

A bearing pocket portion110may be formed to protrude from a central portion of an inner bottom surface of the housing100. The bearing pocket portion110may be formed by being surrounded by an annular inner wall110aso as to define an accommodation space of the bearing500therein. Here, an upper portion of the bearing pocket portion110may open, and a shaft hole112through which the shaft400passes is formed in a bottom surface111of the bearing pocket portion110.

Foreign materials may exit the motor to the outside through the shaft hole112. Meanwhile, a wave washer may be installed between the bearing500and the bottom surface111.

The stator200may be disposed to be spaced a predetermined distance from the inner circumferential surface of the housing100, and a space may be formed at a center of the stator200.

The rotor300may be rotatably installed in a state in which the rotor300is accommodated in the space of the stator200. The stator200may be formed with a plurality of stator cores, and a coil configured to generate a rotational magnetic field may be wound around each of the stator cores. The coil wound around the stator core may be covered and insulated by an insulator. However, the present invention is not limited thereto, and the stator may be formed as a single core type.

When a current is supplied to the coil wound around the stator200, an electrical interaction with the rotor300occurs to induce rotation of the rotor300. When the rotor300rotates, the shaft400is rotated to supply power.

A Housing of a Motor According to a First Embodiment

FIG. 2is a view illustrating a housing of a motor according to a first exemplary embodiment of the present invention,FIG. 3is a view illustrating a bearing pocket portion of the housing illustrated inFIG. 2, andFIG. 4is a view illustrating an accommodation groove of the housing illustrated inFIG. 2.FIGS. 2 to 4are the views clearly illustrating main features for a clear conceptual understanding of the present invention, and thus various modifications are expected and the scope of the present invention is not limited to specific shapes illustrated in the drawings.

Referring toFIGS. 2 to 4, a bearing pocket portion110including an accommodation space S for a bearing is formed in a lower portion of a housing100, and a stepped portion113which defines an accommodation groove H may be formed in the bearing pocket portion110.

As the stepped portion113protrudes upward along a circumference of the shaft hole112, the accommodation groove H is formed between the stepped portion113and an inner wall110aof the bearing pocket portion110. The stepped portion113has an entirely protrusive annular partition structure.

Since the accommodation groove H is concavely formed between the inner wall110aof the bearing pocket portion110and the stepped portion113, the accommodation groove H traps foreign materials discharged from a motor housing, a wave washer, a bearing, and the like, and thus the foreign materials may be prevented from exiting through the shaft hole112,

A height of the stepped portion113may be appropriately changed in consideration of a size of the bearing500and whether a wave washer W is installed.

Meanwhile, although a bottom surface111of the bearing pocket portion110forming the accommodation groove H is illustrated in a flat shape, the present invention is not limited thereto, and the bottom surface111may be changed to be concave to extend a volume of the accommodation groove H.

A Motor Housing According to a Second Embodiment

FIG. 5is a view illustrating a bearing pocket portion of a housing of a motor according to a second exemplary embodiment of the present invention, andFIG. 6is a view illustrating an accommodation groove of the housing illustrated inFIG. 5.FIGS. 5 and 6are the views clearly illustrating main features for a clear conceptual understanding of the present invention, and thus various modifications are expected and the scope of the present invention is not limited to specific shapes illustrated in the drawings.

Referring toFIGS. 5 and 6, an accommodation groove H defined by a stepped portion113may be formed in a double step structure. Specifically, a bottom surface111of a bearing pocket portion110may be formed with two stepped surfaces111aand111bin a radial direction of a housing100. The two stepped surfaces111aand111bmay be formed as annular stepped surfaces which are gradually lowered in the radial direction.

Here, a wave washer W may be installed on the stepped surface111awhich is adjacent to the shaft hole112and refers to an inner stepped surface among two stepped surfaces111aand111b. The stepped surface111amay be formed in a flat shape such that the wave washer W is stably seated thereon.

An accommodation groove H is defined by the stepped surface111bwhich is located at an outside of the stepped surface111aand refers to an outer stepped surface.

A seating space of the wave washer W is secured by the stepped portion113, and the accommodation groove H is also defined by the stepped portion113.

A motor housing according to a third embodiment.

FIG. 7is a view illustrating a bearing pocket portion of a housing of the motor according to a third exemplary embodiment of the present invention, andFIG. 8is a view illustrating the accommodation groove of the housing illustrated inFIG. 7.FIGS. 7 and 8are the views clearly illustrating main features for a clear conceptual understanding of the present invention, and thus various modifications are expected and the scope of the present invention is not limited to specific shapes illustrated in the drawings.

Referring toFIGS. 7 to 8, an accommodation groove H defined by a stepped portion113may be formed in a double step structure, and grooves113amay be formed in the stepped portion113to be spaced a predetermined distance from each other in a circumferential direction. Each of the grooves113amay be concavely formed up to an inner stepped surface111a.

For example, the stepped portion113may be substantially formed in a saw tooth shape. Since the groove113atraps foreign materials which pass the stepped portion113and exit through shaft hole112, the foreign materials may be effectively prevented from exiting.

FIG. 9is a view illustrating a sealing member and a sealing groove of a bearing.

Referring toFIG. 9, a bearing500is inserted into a bearing pocket portion110, and a sealing member600may be installed between an inner wall110aof the bearing pocket portion110and an outer race of the bearing500. The sealing member600prevents foreign materials accommodated in the accommodation groove H from exiting through a gap between the inner wall110aof the bearing pocket portion110and the bearing500to effectively prevent the foreign materials exiting through the shaft hole.

Meanwhile, a sealing groove510which is concavely formed along a circumference of a side of the outer race of the bearing500and into which the sealing member600is inserted may be formed.

The housing of the motor and the motor including the same according to the exemplary embodiment of the present invention have been specifically described above with reference to the accompanying drawings.

While the present invention has been particularly described with reference to the exemplary embodiments, those skilled in the art should understand that various changes in form and details may be made without departing from the spirit and scope of the present invention. Therefore, the exemplary embodiments should be considered in a descriptive sense only and not for purposes of limitation. The scope of the present invention is defined not by the detailed description of the present invention but by the appended claims, and encompasses all modifications and equivalents that fall within the scope of the appended claims.