Abstract:
Disclosed herein is a bearing module for a motor that rotatably supports a rotational shaft and is sintered and molded, including: an upper bearing; and a lower bearing coupled to the upper bearing, wherein an oil receiving portion is formed in at least one of the upper bearing and the lower bearing.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims the benefit of Korean Patent Application No. 10-2012-0133841, filed on Nov. 23, 2012, entitled “Bearing Module for Motor”, which is hereby incorporated by reference in its entirety into this application. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Technical Field 
         [0003]    The present invention relates to a bearing module for a motor. 
         [0004]    2. Description of the Related Art 
         [0005]    Motors use a ball bearing or a sleeve bearing according to the type thereof. 
         [0006]    Further, in the case where the sleeve bearing is adopted, a contact portion with a shaft is broadened when the length of the sleeve bearing increases, and as a result, swing can be reduced and friction becomes larger. 
         [0007]    Further, in the case where the sleeve bearing is manufactured by sintered molding, a porous is impregnated with oil and when the shaft rotates and a temperature and pressure increase, oil flows out from the porous to reduce friction. 
         [0008]    However, a sintering bearing in the related art including Patent Document below, which includes a patent document described below is short in life-span because oil supply is limited, and as a result, reliability of the motor deteriorates. 
       Related Art Document 
     Patent Document 
       [0009]    (Patent Document 1) US 20100310199 A 
       SUMMARY OF THE INVENTION 
       [0010]    The present invention has been made in an effort to provide a bearing module that can improve a life-span of a bearing and reliability of a motor as an upper bearing and a lower bearing are formed by sintered molding and an oil receiving portion is formed in at least one of the upper bearing and the lower bearing. 
         [0011]    Further, the present invention has been made in an effort to provide a bearing module that can improve a life-span of a bearing and reliability of a motor while preventing oil from flowing out by forming an upper bearing and a lower bearing by sintered molding, forming an oil receiving portion in at least one of the upper bearing and the lower bearing, and inserting an oil containing member into the oil receiving portion. 
         [0012]    According to a first preferred embodiment of the present invention, there is provided a bearing module for a motor that rotatably supports a rotational shaft and is sintered and molded, including: an upper bearing; and a lower bearing coupled to the upper bearing, wherein an oil receiving portion is formed in at least one of the upper bearing and the lower bearing. 
         [0013]    The plurality of oil receiving portions may be formed in a circumferential direction of the upper bearing or the lower bearing at equidistance. 
         [0014]    Coupling portions constituted by protrusions and grooves which correspond to each other may be formed in the upper bearing and the lower bearing, and the protrusions and the grooves may be engaged with each other, such that the upper bearing and the lower bearing are coupled to each other. 
         [0015]    The coupling portions may be formed so that the protrusions and the grooves are repeated in the circumferential direction. 
         [0016]    The plurality of grooves of the coupling portions may correspond to the oil receiving portions and the plurality of protrusions may be formed in areas among the oil receiving portions. 
         [0017]    The bearing module for a motor may further include an oil containing member inserted into the oil receiving portion. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0018]    The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 
           [0019]      FIG. 1  is a schematic perspective view of a bearing module for a motor according to a first preferred embodiment; 
           [0020]      FIG. 2  is a schematic exploded perspective view of the bearing module for a motor illustrated in  FIG. 1 ; and 
           [0021]      FIG. 3  is a schematic cross-sectional view of a bearing module for a motor according to to a second preferred embodiment. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0022]    The objects, features and advantages of the present invention will be more clearly understood from the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same reference numerals are used to designate the same or similar components, and redundant descriptions thereof are omitted. Further, in the following description, the terms “first”, “second”, “one side”, “the other side” and the like are used to differentiate a certain component from other components, but the configuration of such components should not be construed to be limited by the terms. Further, in the description of the present invention, when it is determined that the detailed description of the related art would obscure the gist of the present invention, the description thereof will be omitted. 
         [0023]    Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. 
         [0024]      FIG. 1  is a schematic perspective view of a bearing module for a motor according to a first preferred embodiment.  FIG. 2  is a schematic exploded perspective view of the bearing module for a motor illustrated in  FIG. 1 . As illustrated in the figure, the bearing module  100  for a motor includes an upper bearing  110  and a lower bearing  120 . 
         [0025]    Further, the upper bearing  110  and the lower bearing  120  are formed by sintering bearings and coupling portions which correspond to each other are formed so that the upper bearing  110  and the lower bearing  120  are coupled to each other. 
         [0026]    In more detail, the upper bearing  110  has a hollow portion so that a rotational shaft (not illustrated) is inserted into an inner diameter portion and has a cylindrical shape. Further, the upper bearing  110  has an oil receiving portion (not illustrated) which is a groove capable of receiving oil therein. In addition, the plurality of oil receiving portions may be formed in a circumferential direction of the upper bearing  110  at equidistance. 
         [0027]    The oil receiving portion has the same shape as an oil receiving portion  121  of the lower bearing  120  to be described below and is illustrated in a bearing module according to another preferred embodiment of  FIG. 3 . Therefore, this is apparent by those skilled in the art and may be easily implemented. 
         [0028]    A coupling portion  112  is formed on one surface of the upper bearing  110  facing the lower bearing  120  coupled to a lower portion thereof. The coupling portion  112  may be formed so that a protrusion  112   a  and a groove  112   b  are repeated. 
         [0029]    The plurality of grooves  112   b  are formed to correspond to the oil receiving portion and the plurality of protrusions  112   a  may be formed in areas among the oil receiving portions. 
         [0030]    The lower bearing  120  has the cylindrical shape of the same size as the upper bearing  110  and has the oil receiving portion  121  capable of receiving oil therein. The plurality of oil receiving portions  121  may be formed in a circumferential direction of the lower bearing  120  at equidistance similarly as the oil receiving portion of the upper bearing  110 . 
         [0031]    A coupling portion  122  is formed on one surface of the lower bearing  120  facing the upper bearing  110  coupled to an upper portion thereof and the coupling portion  122  is formed so that a protrusion  122   a  and a groove  122   b  are repeated. 
         [0032]    That is, the protrusion  122   a  of the lower bearing  120  corresponds to the groove  112   b  of the upper bearing  110  and the groove  122   b  of the lower bearing  120  corresponds to the protrusion  112   a  of the upper bearing  110 . 
         [0033]    The plurality of grooves  122   b  may correspond to the oil receiving portions  121  and the plurality of protrusions  122   a  may be formed to correspond to areas among the oil receiving portions  121  or the grooves  122   b.    
         [0034]    As described above, as the bearing module  100  for a motor according to the first preferred embodiment of the present invention is engaged in such a manner that the protrusion  112   a  of the upper bearing  110  and the groove  122   b  of the lower bearing  120  are coupled to each other and the groove  112   b  of the upper bearing  110  and the protrusion  122   a  of the lower bearing  120  are coupled to each other, the upper bearing  110  and the lower bearing  120  are coupled to each other. 
         [0035]    In this case, as oil is stored in the oil receiving portion of the upper bearing  110  and the oil receiving portion  121  of the lower bearing  120 , the bearing module  100  for a motor according to the present invention, which is configured by the sintering bearing may be implemented to have an improved life-span and a more stable bearing structure. 
         [0036]    As the upper bearing  110  and the lower bearing  120  are configured by the sintering bearings, the upper bearing and the lower bearing are coupled to each other by compression processing and an airtightness effect is improved by the coupling portion. 
         [0037]      FIG. 3  is a schematic cross-sectional view of a bearing module for a motor according to a second preferred embodiment. 
         [0038]    As illustrated in the figure, the bearing module  200  for a motor according to the second preferred embodiment further includes an oil containing member  230  as compared with the bearing module  100  for a motor according to the first preferred embodiment. 
         [0039]    In more detail, the bearing module  200  for a motor includes an upper bearing  210  and a lower bearing  220 . 
         [0040]    The upper bearing  210  and the lower bearing  220  are formed by the sintering bearings and coupling portions which correspond to each other are formed so that the upper bearing  210  and the lower bearing  220  are coupled to each other, like the bearing module  100  according to the first preferred embodiment. 
         [0041]    In more detail, the upper bearing  210  has a hollow portion so that a rotational shaft (not illustrated) is inserted into an inner diameter portion and has a cylindrical shape. Further, the upper bearing  210  has an oil receiving portion  211  which is a groove capable of receiving oil therein. In addition, the plurality of oil receiving portions  211  may be formed in a circumferential direction of the upper bearing  210  at equidistance. 
         [0042]    A coupling portion  212  is formed on one surface of the upper bearing  210  facing the lower bearing  220  coupled to a lower portion thereof. The coupling portion  212  may be formed so that a protrusion  212   a  and a groove  212   b  are repeated. 
         [0043]    The plurality of grooves  212   b  may correspond to the oil receiving portions  211  and the plurality of protrusions  212   a  may be formed to correspond to areas among the oil receiving portions  211  or the grooves  212   b.    
         [0044]    The lower bearing  220  has the cylindrical shape of the same size as the upper bearing  210  and has an oil receiving portion  221  capable of receiving oil therein. The plurality of oil receiving portions  221  may be formed in a circumferential direction of the lower bearing  220  at equidistance similarly as the oil receiving portion  211  of the upper bearing  210 . 
         [0045]    A coupling portion  222  is formed on one surface of the lower bearing  220  facing the upper bearing  210  coupled to an upper portion thereof and the coupling portion  222  is formed so that a protrusion  222   a  and a groove  222   b  are repeated. 
         [0046]    That is, the protrusion  222   a  of the lower bearing  220  corresponds to the groove  212   b  of the upper bearing  210  and the groove  222   b  of the lower bearing  220  corresponds to the protrusion  212   a  of the upper bearing  210 . 
         [0047]    The plurality of grooves  222   b  may correspond to the oil receiving portions  221  and the plurality of protrusions  222   a  may be formed to correspond to areas among the oil receiving portions  221 . 
         [0048]    The bearing module  200  further includes an oil containing member  230  which inserted into the oil receiving portion  211  of the upper bearing  210  and contains oil. 
         [0049]    The oil containing member  230  may be made of various materials which can easily contain oil, such as nonwoven fabric, felt, fiber, and the like. 
         [0050]    As described above, as the bearing module  200  for a motor according to the second preferred embodiment of the present invention is engaged in such a manner that the protrusion  212   a  of the upper bearing  210  and the groove  222   b  of the lower bearing  220  are coupled to each other and the groove  212   b  of the upper bearing  210  and the protrusion  222   a  of the lower bearing  220  are coupled to each other, the upper bearing  210  and the lower bearing  220  are coupled to each other. 
         [0051]    In this case, as oil is stored in the oil receiving portion  211  of the upper bearing  210  and the oil receiving portion  221  of the lower bearing  220 , and the oil containing member  230  is received in the oil receiving portions  211  and  221 , the bearing module  200  for a motor according to the present invention, which is configured by the sintering bearing may be implemented to have an improved life-span and a more stable bearing structure. 
         [0052]    As the upper bearing  210  and the lower bearing  220  are configured by the sintering bearings, the upper bearing and the lower bearing are coupled to each other by compression processing and an airtightness effect is improved by the coupling portion. 
         [0053]    According to preferred embodiments of the present invention, a life-span of a bearing and reliability of a motor can be improved as an upper bearing and a lower bearing are formed by sintered molding and an oil receiving portion is formed in at least one of the upper bearing and the lower bearing and furthermore, a life-span of a bearing and reliability of a motor can be improved while oil can be prevented from flowing out by inserting an oil containing member into the oil receiving portion. 
         [0054]    Although the embodiments of the present invention have been disclosed for illustrative purposes, it will be appreciated that the present invention is not limited thereto, and those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention. 
         [0055]    Accordingly, any and all modifications, variations or equivalent arrangements should be considered to be within the scope of the invention, and the detailed scope of the invention will be disclosed by the accompanying claims.