Miniature motor

• US 5,382,852 A
• Filed: 07/21/1993
• Issued: 01/17/1995
• Est. Priority Date: 05/31/1993
• Status: Expired due to Term

• Current Assignee: Mabuchi Motor Company Limited
• Original Assignee: Mabuchi Motor Company Limited
• Inventors: Kato, Masahiko, Someya, Ryouichi, Yuhi, Toshiya, Ohtake, Takahiro
• Primary Examiner(s): SKUDY, ROBERT
• Application Number:
  US08/095,608
• Time in Patent Office: 545 Days
• Field of Search: 310/40 MM, 310/71, 310/89, 310/241, 310/248, 310/242, 310/43, 310/42, 310/90, 310/156, 439/733, 439/733.1, 439/746, 439/747, 439/751, 439/869, 439/870, 439/871, 439/872, 439/873
• US Class Current: 310/40.0MM
• CPC Class Codes: H02K 11/02 for suppression of electromagnetic interference
• CPC Class Codes: H02K 5/145 Fixedly supported brushes or brush holders, e.g. leaf or leaf-mounted brushes
• CPC Class Codes: H02K 5/225 Terminal boxes or connection arrangements specially adapted for submersible motors H02K5/132

Abstract

A miniature motor includes a case made of metallic material and formed into a bottomed hollow cylindrical shape and having a permanent magnet fixedly fitted to the inner circumferential surface thereof. A rotor is provided with an armature and a commutator. A case cap is fitted to an open end of the case and has brushes making sliding contact with the commutator. Input terminals are electrically connected to the brushes directly or via other electrically conductive material. The rotor is rotatably supported by bearings provided on the case bottom and the case cap. Through holes formed into a T shape in cross-sectional profile are provided on the case cap made of a resin material. The input terminals each having a stopper on the lower end thereof and a lanced and raised piece on the central part thereof are passed in the through holes, the lanced and raised pieces are bent to almost right angles with the input terminal surface to fixedly fit the input terminals to the case cap.

Claims

1. A miniature motor, comprising:

a case formed of a metallic material into a bottomed hollow tubular shape;

a permanent magnet fixedly fitted to an inner circumferential surface of said case;

a rotor including an armature and a commutator, said rotor being positioned in said case;

a case cap fitted to an open end of said case and having brushes making sliding contact with said commutator;

terminals electrically connected to said brushes;

bearings including a bearing provided on a bottom of said case and a bearing provided on said case cap, said bearings rotatably supporting said rotor, said case cap being formed of resin material and defining through holes having a T shape in cross section, said terminals each having a lower end with a stopper formed thereon and a central part with a lanced and raised piece, said terminals being inserted into said through holes, said lanced and raised piece being bent to substantially a right angle with respect to a surface of a corresponding terminal to fixedly fit each of said terminals to said case cap.

2. A miniature motor according to claim 1, wherein said lower end of each of said terminals is formed into an essentially L shape in longitudinal section by bending each terminal lower end to substantially a right angle with respect to a surface of said terminal, to form bent portions, each bent portion defining said stopper.

3. A miniature motor according to claim 1, wherein said lower end of each said terminal is formed into an essentially T shape and plane or projection profile by making a width of said lower end larger than a width of an intermediate portion of said terminal, said portion having an enlarged width forming said stopper.

4. A miniature motor according to claim 1, wherein said lanced and raised part is provided on a lower end of said input terminal and an electrically conductive member connected to said brush is connected to said lanced and raised part.