Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-06-15
2001-11-20
Tamai, Karl (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S089000, C310S090000
Reexamination Certificate
active
06320292
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
Not Applicable
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH
Not Applicable
REFERENCE TO A MICROFICHE APPENDIX
Not Applicable
BACKGROUND OF THE INVENTION
1. Description of Prior Art
Hitherto, the agitator employed in a vacuum cleaner suction nozzle employs an electric motor disposed in a cylindrical agitator housing to reduce and compactize the agitator. The electric motor for the agitator includes a stator formed on an inner periphery of a metallic barrel and a rotor disposed inside the stator with the agitator housing enclosing the metallic barrel. The rotor is coupled with an output shaft for rotation together therewith, and a rotational output of the output shaft is transmitted through a reduction gear unit to a driven wheel that is drivingly engaged at its outer periphery with the agitator housing to drive the latter. According to the prior art, a bearing for rotatably supporting the agitator housing is mounted externally on an outer periphery of the cylindrical casing.
As discussed above, in the prior art electric motor assembly, the bearing for rotatably supporting the agitator housing has been mounted on the outer periphery of the metallic barrel. The metallic barrel is generally shaped and manufactured by the use of a press work and, accordingly, cannot be made to a highly accurate dimensional precision. The consequence is that a problem occurs that the bearing cannot be accurately fitted, resulting in a trouble in rotation of the agitator.
2. Field of the Invention
The present invention generally relates to an electric motor assembly and, more particularly, to an electric motor assembly of a type including an electric motor built in a driven member such as, for example, an agitator in a suction nozzle for a vacuum cleaner.
SUMMARY OF THE INVENTION
Accordingly, the present invention has been devised to substantially eliminate the above discussed problem inherent in the prior art electric motor assembly and is intended to provide assured support of the bearing to secure a reliable rotation of the driven member.
To accomplish this object, the present invention provides an electric motor assembly including a hollow cylindrical casing having a stator disposed inside and adjacent an inner periphery thereof, a rotor positioned inside the stator and having an output shaft, a bracket mounted in one end of the cylindrical casing, a driven member positioned externally of the cylindrical casing and drivingly coupled with the output shaft for rotation about the output shaft, and a bearing mounted externally on the bracket for rotatably supporting the driven member. The bracket employed therein is made of a thermosetting resin.
According to the present invention, the bracket can be manufactured to a highly accurate dimensional precision and therefore the bearing can be assuredly supported.
Preferably, the bracket has a bearing mounting portion of an outer diameter larger than the outer diameter of the cylindrical casing. The electric motor assembly embodying the present invention may also include a dust beating member disposed on the outer periphery of the driven member to render it to be an agitator for a suction tool of a vacuum cleaner.
The bracket may have a brush carried thereby in sliding contact with a commutator integral with the rotor. This is particularly advantageous in that an electric insulating property can be increased because of the bracket having been made of the thermosetting resin.
According to the present invention, since the bracket is made of a thermosetting resin, an accurate dimensional precision can be attained during molding thereof and, therefore, the bearing support can be assured.
Also, since the bearing mounting portion of the bracket has an outer diameter that is larger than the outer diameter of the cylindrical casing, the bearing can easily mounted on the bracket with the aid of the cylindrical casing serving as a guide therefor and the bracket itself can advantageously used for mounting of the commutator brush.
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patent: 5027469 (1991-07-01), Toyoshima et al.
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patent: 5974623 (1999-11-01), Cummins et al.
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Konishi Tsuyoshi
Nishimura Hiroshi
Tateishi Shiro
Greenblum & Bernstein P.L.C.
Lam Thanh
Matsushita Electric - Industrial Co., Ltd.
Tamai Karl
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