JPH0135548Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a commutator-type rotating electric machine equipped with a plastic brush case.

[Conventional technology]

A DC motor is equipped with a commutator and brushes, and the brush case that guides the brushes is usually attached to the end bracket.

Conventionally, especially for small DC motors, the brush case has been fixed to a bracket made of a pressed metal plate or a bracket made by precision casting with cutting added, mechanically fastened with screws, etc., or fixed with adhesive. ing.

Some brush cases are made of brass and are attached to a bracket through an insulator, but in recent years, methods have also been seen in which the brush case itself is molded from a plastic insulator and attached.

[The problem that the idea aims to solve]

Conventional methods of fixing the brush case to the bracket using mechanical fastening or adhesives not only require a large amount of work, but also require careful attention to ensure circuit insulation during work. In addition, it is troublesome that screws, adhesives, etc. need to be managed.

The present invention was devised to solve these problems, and provides a commutator rotating electric machine that can reduce the number of man-hours and eliminate the need to manage the fixing parts when fixing the brush case to the bracket. The purpose is to

[Means to solve the problem]

In order to achieve the above object, the present invention provides a commutator type rotating electrical machine having a bracket 1 and a brush case portion 4, the bracket 1 having one or more through holes 6 formed therein, and a brush case. The brush case part 4 is made of plastic, and the mounting piece 3 is formed on the outside of the side wall.
It passes through a through hole 6 and is integrally molded inside the bracket 1.

[Effect]

In the present invention configured as described above, the brush case is made of plastic and is fixed to the metal bracket by integrally molding the brush case and the mounting piece (connection part). Fixing the brush case to the bracket does not require a special work process, nor does it require management of fixing parts.

〔Example〕

The present invention will be described with reference to embodiments.

FIG. 1 is a side sectional view of an embodiment of the present invention.

FIG. 2 is a partially cutaway front view.

1 is a metal bracket, 2 is a plastic molded material, 3 is a mounting piece (connection part), 4 is a brush case part, 5 is a rotor, 6 is a bracket through hole, 7 is a bearing, 8 is a rotating shaft, 9 is a frame.

The bracket 1 is provided with a plurality of bracket through holes through which plastic flows during plastic molding.

A brush case is outsert molded onto the bracket 1 using plastic.
This is a means for connecting and fixing the parts through the bracket through-hole and the connecting part 3.

In other words, the mounting piece (connection part) 3 is connected to the brush case part 4 using the same plastic molding material through the bracket through hole 6 during plastic molding.
The brush case part 4 is fixedly arranged to prevent it from separating from the bracket 1.

The number of brush case parts 4 is, for example, 2 or 4.
Individual, etc.

However, outsert molding using plastic materials is particularly difficult for the housing part of the bearing 7 and the frame 9.
Care must be taken in the mold to prevent excess plastic from adhering to the fitting part. in this way,
In the present invention, the brush case part 4 and the mounting piece 3 passing through the through hole 6 of the bracket 1 are integrally molded by molding plastic by outsert. The surface color, luster, pattern, density, etc. are exactly the same,
Furthermore, the texture and surface hardness are exactly the same, and it is obvious at first glance that the two are structurally the same.

In ultra-compact motors and small DC tachogenerators, end brackets are sometimes molded out of plastic, but in fields such as small DC rotating electrical machines, which have recently become smaller and have larger outputs, it is common to see problems occurring inside rotating electrical machines. Due to heat treatment (heat dissipation) and bearing housing strength considerations, it is not possible to make the bracket and brush case entirely of plastic.

[Effect of idea]

Thus, according to the present invention, (1) the brush case is made of plastic and is fixed to the metal bracket by being integrally molded with the attachment piece to the bracket; therefore, the brush case is easily attached to the bracket; When fixing, the work process can be reduced and the management of fixed parts can be eliminated.(2) There is no gap between the brush case mounting piece and the bracket, so the positioning accuracy of the brush case relative to the bracket is improved. effective.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of one embodiment of the present invention, and FIG. 2 is a partially cutaway front view thereof. 1...Bracket, 2...Plastic molding material, 3...Mounting piece (connection part), 4...Brush case part, 5...Rotor, 6...Bracket through hole,
7... Bearing, 8... Rotating shaft, 9... Frame.

Claims (1)

[Claims for Utility Model Registration] A commutator type rotating electric machine having a bracket 1 and a brush case portion 4, wherein the bracket 1 is formed with one or more through holes 6, and the brush case portion 4 is made of plastic. The brush case part 4 has a mounting piece 3 formed on the outside of the side wall.
A commutator-type rotating electric machine that is integrally molded inside the bracket 1 through the through hole 6 of the bracket 1.