Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1998-02-25
2000-05-09
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Rotary
310 43, 310 40MM, H02K 500
Patent
active
060608072
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a rotating shaft support member and a small motor equipped with the same.
RELATED ART
A motor has a casing, a stator and a rotor. The stator and rotor are installed in the casing wherein the rotor is rotatably supported by the brackets installed at both ends of the casing. In this case, the rotating shaft of the rotor is supported by dedicated oil-retaining bearings composed of a sintered metal impregnated with, for example, 18 vol % of a lubricant, and the bearing are fitted in and fixed at the center inside the resinous brackets.
Such a configuration, however, poses a problem in that the brackets and bearings, which are separate members, are assembled and the number of the components accordingly increases, requiring time and effort for the assembling operation, especially for positioning the bearings relative to the brackets.
In recent years, the development of small motors used in, for example, pager units, portable telephones, cameras, and portable tape recorders has progressed, and with the trend toward smaller motors, the components including rotors, brackets, and bearings are accordingly becoming smaller.
Higher accuracy in the dimensions, positioning, etc. of constituent parts which have been assembled is required of such small motors as compared with large- or medium-sized motors. As mentioned above, in the rotating shaft support member for supporting the rotating shaft, the bearings, which are separated parts from the brackets, are incorporated in the brackets; hence, there is a problem with assembling accuracy, that is, the positioning accuracy or the like of a shaft bore is deteriorated.
In view of the foregoing problems, it is an object of the present invention to provide a rotating shaft support member which permits the number of parts to be reduced and assembly operation to be simplified and also enables improved dimensional accuracy, and also to provide a small motor equipped with the same.
DISCLOSURE OF THE INVENTION
To solve the foregoing problems, according to the present invention, there is provided a rotating shaft support member which supports a rotating shaft and which has a bracket main body, wherein bearing units which rotatably support the ends of the rotating shaft are formed integrally with the bracket main body.
According to the rotating shaft support member and the small motor in accordance with the present invention, the bearing units formed as integral parts of the bracket main body make it possible to reduce the number of parts and to simplify the assembly operation.
Further, when at least the bearing units of the bracket main body are composed of a resin having lubricating properties which is represented by a liquid crystal polymer, the sliding resistance of the rotating shaft with respect to a shaft bore is reduced, enabling reduced loss in motor torque. In particular, composing the bearing units by using a liquid crystal polymer permits improved quietness while the motor is running, and better durability and better formability of the bearing units, and also makes it possible to obtain molded articles with extremely high dimensional accuracy of each component and especially of the inside diameter and depth of the shaft bore.
Furthermore, when a through hole for passing a lead wire therethrough is formed in the bracket main body and when the through hole has a portion where the inside diameter thereof gradually increases toward the inside of the bracket main body, the holding force for the lead wire passed through the through hole can be improved, preventing the lead wire from being slipped off.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a top plan view illustrating an embodiment of a rotating shaft support member in accordance with the present invention;
FIG. 2 is a cross-sectional view at the line A--A of FIG. 1;
FIG. 3 is a partial longitudinal sectional view illustrating an embodiment of a small motor in accordance with the present invention; and
FIG. 4 is a schematic diagram showing the flow of resin o
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Kawabata Seiji
Saito Kohichi
Ramirez Nestor
Seiko Epson Corporation
Waks Joseph
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