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Miniature motor
| Details |
Inventors: Sato, Makoto;
Assignee: Mabuchi Motor Co., Ltd. (Chiba, JP)
Primary Examiner: Voeltz; Emanuel T.
Assistant Examiner: Jones; Judson H.
Attorney, Agent or Firm: McGlew and Tuttle
A miniature motor comprising a case formed of a metallic material into a bottomed hollow cylindrical shape on the inner circumferential surface of which a permanent magnet is fixedly fitted, a rotor consisting of an armature facing the permanent magnet and a commutator, a case cover fitted to the opening of the case, and having brushes for making sliding contact with the commutator and input terminals electrically connected to the brushes; the rotor being rotatably supported by bearings provided on the bottom of the case and the case cover, in which electronic components are inserted in series between a pair of the input terminals via spring members made of an electrically conductive material. |
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DETAILED DESCRIPTION OF THE EMBODIMENTS FIG.
4 is an inside end view illustrating a case cover in a miniature motor embodying this invention.
FIGS.
5 and 6 are sectional views taken along line 5A-5B-5C-5D-5E and line 6--6 in FIG.
4, respectively.
In FIGS.
4 through 6, numeral 1 refers to a case cover formed of a thermoplastic resin material into an essentially cup shape, and having a pair of input terminals 2 and a pair of brush arms 3.
Numeral 4 refers to a brush fixedly fitted to a free end of a brush arm 3.
The input terminal 2 is electrically connected to the brush arm 3.
Numeral 5 refers to a bearing, and 6 to a case engaging portion having an outside diameter and shape corresponding to the inside diameter and shape of a case (not shown.
Refer to numeral 31 in FIGS.
1 through 3.
) Numeral 7 refers to a capacitor placed in a housing space 71 provided in the case cover 1, and disposed so as to make contact with the extended part 2a of the input terminal 2 via an electrode 8.
Numeral 9 refers to a spring member made of an electrically conductive material and disposed in such a manner as to force or hold the capacitor 7 on the extended part 2a of the input terminal 2 via the electrode 8 in the housing space 97, as will be described later.
The spring member 9 is disposed in such a manner that the spring member 9 is partially exposed to the outer circumferential surface of the case cover 1, for example, so that the spring member 9 is electrically connected to a case (not shown), made of a metallic material, when the case cover 1 is engaged with the case.
FIG.
7 is an enlarged perspective view illustrating the spring member 9 shown in FIGS.
4 through 6.
In FIG.
7, the spring member 9 is made of an electrically conductive strip or hoop material, and consists of an essentially U-shaped holder portion 91, an essentially W-shaped spring portion 92 formed by extending and bifurcating one leg of the holder portion 91, and a retainer portion 93 formed on a free end of the spring portion 92.
Numeral 94 indicates an engaging portion provided on the holder portion 91, which protrudes from the surface of the holder portion 91 so as to engage with the support portion 96 on the case cover 1 when the spring member 9 is fitted to the case cover 1, as shown in FIG
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Generators or Motors 
