JPS626831Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a DC motor used as a starting motor for an engine.

Conventionally, in this type of electric motor, an armature is housed in a cylindrical yoke, and both ends of the rotating shaft of the armature are rotatably attached to first and second bearing brackets disposed on both sides of the yoke. It is known to have a brush assembly mounted in a first bearing bracket.

An object of the present invention is to improve the assemblability and watertightness of the electric motor.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a cylindrical yoke;
Second bearing brackets 2 ₁ , 2 ₂ are provided. A field core 3 is fixed to the inner peripheral surface of the yoke 1 with screws 4, and a field coil 5 is wound around the outer periphery of the core 3. An armature 6 is housed in the yoke 1, and both ends of a rotating shaft 7 protruding from both end faces of the armature 6 are connected to first and second bearing brackets ₂₁ and _22, respectively.
is rotatably supported via bearings 8 and 9. A commutator 10 is fixed to the rotating shaft 7 within the first bearing bracket ₂₁ .

The first bearing bracket ₂₁ is press-formed from a steel plate into a U-shape, and is designed to support the rotating shaft 7.
It is composed of a base plate 11 having a concave bearing housing 13 in the center, and a pair of legs 12 that protrude in parallel from both ends of the base plate 11 to face each other and sandwich a brush assembly 16 therebetween. Ears 15 having screw holes 14 are provided on both sides of the base plate part 11 in a protruding manner.

On the inner surface of the base plate 11 of the first bearing bracket ₂₁ , an annular supporting plate 17 of a brush assembly 16 is superimposed on both ears 15 via an insulating member ₁₈₁ , and is superimposed on the supporting plate 17 and its inner surface. Insulating plate 18 ₂
The brush assembly 16 is attached to the first bearing bracket 2 by screwing the screw 19 passing through the screw hole 14 into the screw hole 14.
Attached to ₁ . The brush assembly 16 includes a pair of first brush holders 201 protruding from the inner surface of the annular support plate 17 to face each other, and a pair of first brush holders ₂₀₁ facing each other with a phase difference of 90 degrees with respect to each first brush holder ₂₀₁ . A pair of second brush holders 20 protruding from each other.
₂ , each of the first and second brush holders 20 ₁ ,
The leg portion 12 of the first bearing bracket ₂₁ is located between the first bearing bracket ₂₀₂ . Second brush holder 2
0 ₂ is the supporting plate 17 by the insulating plates 18 ₁ and 18 ₂ .
Insulated against In addition, each brush holder 20
A brush 21 is attached to each brush holder 20 ₁ , 20 ₂ , and each brush 21 slides on the outer circumferential surface of the commutator ₁₀ by pressing the operating end 22 a of a spiral spring 22 attached to each brush holder 20 1 _, 20 2 on the back surface of the brush 21 . It's starting to rub. The brushes 21 of both first brush holders 20 ₁ are connected to the support plate 17 via connection lines 23 , while the brushes 21 of both second brush holders 20 ₂
is connected to the field coil 5 via a connecting wire 24. A terminal rod 25 protruding from the outer surface of the support plate 17 passes through the first bearing bracket ₂₁ via an insulating bushing 26 and extends to the outside.

The first bearing bracket ₂₁ supports the end of the rotating shaft 7 through the bearing 8 within the bearing housing 13, and has both legs 12 abutted against the end face of the yoke 1 by pin-fitting. be done. At this time, the positioning pin 27 protruding from the end face of the yoke 1 is engaged with the notch 28 of one of the legs 12 to position the first bearing bracket ₂₁ with respect to the yoke 1.

A cover 29 covering the first bearing bracket ₂₁ has a cylindrical shape, and a recess 30 for accommodating the outer wall of the bearing housing 13 of the first bearing bracket ₂₁ is formed on the inner surface of the bottom thereof. The cover 29 is disposed with its bottom inner surface superimposed on the outer surface of the base plate 11 and its opening fitted onto the outer circumferential surface of the end of the yoke 1 via the sealing member 31 . penetrates the bottom of the tube and extends to the outside.

A through bolt 32 is passed through the cover 29, the first bearing bracket ₂₁ and the yoke 1 from the cover 29 side, and by screwing the through bolt 32 onto the second bearing bracket ₂₂ , the three members 29,2
₁ and 1 are coupled to a second bearing bracket ₂₂ .
In this case, in addition to screwing all of the through bolts 32 into the second bearing bracket ₂₂ , some of the through bolts 32 are passed through the second bearing bracket ₂₂ in relation to other equipment, and are attached to other equipment. It may also be screwed onto.

As described above, according to the present invention, the armature 6 is housed in the cylindrical yoke 1, and both ends of the rotating shaft 7 of the armature 6 are connected to the first and second yoke disposed on both sides of the yoke 1. In a DC motor which is rotatably supported by bearing brackets 2 ₁ and 2 ₂ and in which a brush assembly 16 is disposed within the first bearing bracket 2 ₁ , the first bearing bracket 2 ₁ is connected to a substrate that supports the rotating shaft 7 . Part 11
and a pair of legs 12 that protrude in parallel from both ends of the legs so as to face each other and sandwich the brush assembly 16 therebetween.
The brush assembly 16 is attached to the inner surface of the base plate 11, and the bottom inner surface of the cylindrical cover 29 is overlapped with the outer surface of the base plate 11, thereby forming both legs ₁₂ of the first bearing bracket 21. The end face is abutted against the end face of the yoke 1, and the opening of the cover 29 is fitted to the outer peripheral surface of the yoke 1 via the seal member 31, and the cover 29, the first bearing bracket ₂₁ , and the yoke 1 are
Since it is connected to the second bearing bracket ₂₂ by a through bolt 32 passing through them, a wide working space is formed between both legs 12 of the first bearing bracket ₂₁ , so that the brush assembly for the first bearing bracket ₂₁ can be assembled easily. Installation of solid body 16, its brush assembly 1
Each work such as attaching a brush to the brush 6 can be performed efficiently. In addition, the first bearing bracket 2 ₁ to which the brush assembly 16 is attached, the cover 29 and the yoke 1 are connected by through bolts 32 to improve their ease of assembly. 1 bearing bracket 2
It is possible to prevent water from entering the interior of the device ₁ , improve watertightness, and avoid problems such as poor contact.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a longitudinal sectional side view, Fig. 2 shows the case cut along the line - Fig. 1, and Fig. 3 is a sectional view taken along the line - Fig. 1. FIG. 3 is an exploded perspective view of main parts. DESCRIPTION OF SYMBOLS 1... Yoke, 2 ₁ , 2 ₂ ... First and second bearing brackets, 6... Armature, 7... Rotating shaft, 11...
...Substrate part, 12... Leg part, 16... Brush assembly, 29... Cover, 31... Seal member, 32
...Through bolt.

Claims (1)

[Scope of utility model registration request] An armature 6 is housed in the cylindrical yoke 1, and both ends of the rotating shaft 7 of the armature 6 are attached to first and second bearing brackets 2 ₁ and 2 ₂ disposed on both sides of the yoke 1, respectively. In a DC motor rotatably supported and having a brush assembly 16 disposed within the first bearing bracket ₂₁ , the first bearing bracket ₂₁ is connected to a base plate 11 supporting the rotary shaft 7, and The brush assembly 16 is formed into a U-shape with a pair of legs 12 protruding in parallel from both ends to face each other and sandwiching the brush assembly 16, and the brush assembly 16 is attached to the inner surface of the base plate 11. The bottom inner surface of the cylindrical cover 29 is overlapped with the outer surface of the cylindrical cover 29, and the end surfaces of both legs ₁₂ of the first bearing bracket 21 are abutted against the end surfaces of the yoke 1, and the opening of the cover 29 is closed with a sealing member 31. A through bolt 32 is fitted onto the outer peripheral surface of the yoke 1 through the cover 29, the first bearing bracket ₂₁ and the yoke 1, and passes through them.
A direct current motor, characterized in that it is coupled to the second bearing bracket ₂₂ by.