JPH0419974Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a connection structure between a brush and an external power supply line in a small electric motor.

[Technical background of the invention]

For example, electric motors for opening and closing windows used in automobile doors must have a thinner motor width because of restrictions on the thickness of the door, and in recent years there has been an increasing demand for thinner motors.

When the motor width is made thinner, not only the armature and its surroundings are forced to be smaller, but also the arrangement of parts around the brushes becomes more dense.

Conventionally, the brush and the external power supply line have been connected by soldering the external power supply line directly to the brush within the motor case.

[Problems with background technology]

However, as the parts arrangement around the brush becomes more dense as mentioned above, the soldering work has to be carried out in a narrow space, which makes the work extremely difficult, and the solder resin flows into the brush holder, damaging the brush. Electrical insulation problems are likely to occur, such as sticking to the desired location or adhering to the power supply line, causing the insulation coating to burn out, resulting in a decrease in quality.

[Purpose of invention]

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to improve workability by separating the soldering points from the surroundings of the brush and performing it outside, and to make use of excess space. It is an object of the present invention to provide a power supply line connection structure for a small electric motor that can be flattened without increasing the external dimensions.

[Structure of the idea]

In order to achieve the above object, the present invention integrally forms a worm gear box with an end cover that closes one end of the motor case, houses a worm gear and a worm shaft that meshes with the worm gear, and accommodates the worm gear and the worm shaft that meshes with the worm gear. In a small electric motor in which the worm shaft is connected to the output shaft of an armature and the rotation of the output shaft is transmitted to the worm shaft to drive the worm gear, the motor case is flattened in the same direction as the flattened shape of the worm gear box. The end cover that is attached to the motor case is provided with brush holders that face each other so as to sandwich the commutator, and the direction in which these brush holders face each other intersects the flat direction of the motor case. brushes that are in sliding contact with the commutator are attached to these brush holders, and terminal fittings are attached to the end cover that are located on the opposite side of the worm gear box across the worm shaft and along the axial direction of the worm shaft. is inserted, the inner end of this terminal fitting is connected to the brush, the outer end faces the connection box formed on the end cover, and the terminal fitting is fed along the axial direction of the worm shaft onto the outer surface of the worm gear box. The present invention is characterized in that an electric wire is routed, and the power supply line and the outer end of the terminal fitting are connected within the connection box.

[Effect]

According to the configuration of the present invention as described above, a brush holder is provided on the end cover that closes one end of the motor case, facing toward each other in a direction intersecting the flat direction of the motor case and narrowing the commutator, and these brush holders Since a brush is attached to the motor case in sliding contact with the commutator, the motor case can be kept in a flat shape, and the entire motor case can be flattened to match the flat shape of the worm gear box.

Then, a terminal fitting is inserted into the end cover, located on the opposite side of the worm gear box with the worm shaft in between, and along the axial direction of the worm shaft, and the inner end of the terminal fitting is connected to the brush. The outer end faces the connection box formed on the end cover, and the outer end of the terminal fitting and the power supply line are connected within this connection box, so the soldering point is located outside, away from the area around the brushes inside the motor case. will be set to
With such an external location, the work space is large and work efficiency is improved.

Furthermore, since this connection box is formed on the opposite side of the worm gear box across the worm shaft, this area is a surplus space of the worm gear box, and this surplus space can be used effectively, making the entire motor larger. Not only does it not occur, but it is even more effective in flattening the surface.

[Example of idea]

The present invention will be explained below based on one embodiment shown in the drawings.

Figure 1 shows the whole of a small DC motor for opening and closing windows used in automobile doors. 1 is a motor case made of an insulating material such as synthetic resin, and 2 is a motor case made of an insulating material such as synthetic resin. End cover made of insulating material such as synthetic resin, 3 is motor case 1
4 is an armature provided inside the field 3, 5 is a commutator, and 6 is a motor shaft. The motor shaft 6 is attached to the motor case 1
It is rotatably supported by bearings 7 and 8 attached to the end cover 2.

The end cover 2 is formed integrally with the worm gear box 9. That is, the worm gear box 9 also serves as the end cover 2 that closes the end of the motor case 1. In this case, the end cover 2 is formed so that its size does not exceed the thickness of the flat shape of the worm gear box 9, and therefore the shape of the motor case 1 is the same as the flat shape of the worm gear box 9, as can be understood from FIG. They are formed in a flat shape in the same direction. A worm shaft 10 integrally formed with the motor shaft 6 is introduced into the end cover 2 which also serves as a worm gear box.
0 is supported by the end cover 2 via a bearing 11.
The worm gear box 9 includes a worm shaft 1.
A wormwheel worm gear 12 that meshes with the motor shaft 6 is housed therein, so that the rotation of the armature 4 is transmitted from the motor shaft 6 to the wormwheel 12 through the worm shaft 10 .

The end cover 2 is formed with an introduction hole 13 through which the motor shaft 6 is inserted, and the introduction hole 13 is opened on the inner surface of the end cover 2 facing the inside of the motor case 1. On the inner surface of the end cover 2, as shown in FIGS. 5A to 5C, a pair of brush holders 14, 14 are provided at symmetrical positions with respect to the introduction hole 13.
is formed.

The brush holders 14, 14 are integrally molded to protrude from the end cover 2, and are arranged facing each other in a direction intersecting the flat direction of the flat motor case 1, as shown in FIG. As shown, it has a square cylindrical shape. These rectangular cylindrical brush holders 14, 14 have brushes 1 made of carbon or the like.
5 and 15 are slidably inserted. A terminal 17 of a lead wire 16 is welded to the front surface of the brush 15 in advance, and a spring locking groove 18 is carved in the upper surface.

One end 19a of a torsion coil spring 19 is pressed into the spring locking groove 18. Therefore, the brush 15 inserted into the brush holder 14 receives the pressing force of the torsion coil spring 19, so that the lower surface of the brush 15 is pressed against the commutator 5.

A lead wire passage groove 20 and a spring passage groove 21 are formed on the front and side surfaces of the brush holder 14. These passage grooves 20 and 21 are
If the lower surface of the brush 15 is worn out due to sliding contact with the commutator 5, when the brush 15 is moved toward the commutator 5 by the spring 19, the terminal 17 portion of the lead wire 16 and the spring 1
This allows one end 19a of 9 to pass through.

Spring retaining protrusions 22, 22 are integrally formed to protrude from the end cover 2 on the sides of the brush holders 14, 14. These spring holding protrusions 22,2
The coil portions 19b of the torsion coil springs 19, 19 are fitted into the torsion coil springs 2. The other ends 19c of the torsion coil springs 19, 19 are integrally formed to protrude from the end cover 2 and hooked onto the locking step 23, as shown in FIG. 5C.

As shown in FIG. 5A, a pair of fitting grooves 24, 24 are formed on the inner surface of the end cover 2, which will be explained later.

Insertion holes 25 and 26 are penetrated through the end cover 2 in parallel with the introduction hole 13. These insertion holes 25 and 26 are located on the opposite side of the worm gear box 9 with the worm shaft 10 in between, and are formed along the axial direction of the worm shaft 10, and are separated from each other as shown in FIG. The inner ends thereof are open to the inner surface of the end cover 2, and the outer ends thereof are exposed to connection boxes 27 and 28 formed on the outer surface of the end cover 2. These connection boxes 27, 28 are
As shown in FIG. 4, the end cover 2 has a box shape that is opened upward and outward in the drawing. On the bottom of the connection boxes 27 and 28, as shown in FIG.
A locking recess 29 is formed.

Terminal fittings 30 and 40 are inserted into the insertion holes 25 and 26, respectively. These terminal fittings 30 and 40 will be explained below.

One terminal fitting 30 is shown in FIGS. 7A-E. That is, 31 is a lead metal fitting formed of a relatively thick conductive plate, and at one end of this lead metal fitting 31 is a clamp metal fitting 32 formed of a thinner conductive plate than this lead metal fitting 31, and rivets 33... It is connected by... The clamp fitting 32 faces the connection box 27, and has clamp tongues 34, 34 cut and raised at the tip. These clamp tongues 34, 34 clamp the external power supply line 71 by caulking. Further, the clamp fitting 32 has a locking tongue 35 cut and raised downward, and the locking tongue 35 is adapted to be caught in a locking recess 29 formed on the bottom surface of the connection box 27. There is.

Upright guide walls 36 , 36 formed by bending are formed at the tip of the lead fitting 31 , and these guide walls 36 , 36 guide the clamp fitting 30 from the inside of the end cover 2 into the insertion hole 25 . It acts as a guide when inserted, and prevents the clamp fitting 30 inserted in this way from falling or shaking.

The other end of the lead metal fitting 31 is bent, as shown in FIG. 7C, and its tip is guided near the spring holding protrusion 22, as shown in FIG. This lead metal fitting 31
An insertion plug 37 and a capacitor support protrusion 38 are formed at the bent end portion of the cap 32 at a distance from each other.

A plug terminal 39 connected to the other end of the lead wire 16 shown in FIG. 6 is removably inserted into the plug 37, as shown in FIG. 7E.

A locking groove 38a is formed in the capacitor support projection 38, and one lead wire 61a of the capacitor 60 is inserted into the locking groove 38a. The rear end 38b of the capacitor support projection 38 is fitted into the fitting groove 24 formed on the inner surface of the end cover 2, thereby positioning the capacitor support projection 38 and preventing it from rattling. It is.

The other terminal fitting 40 is shown in FIGS. 8A-D. That is, reference numeral 41 denotes a base metal fitting formed of a relatively thick conductive plate, and a clamp metal fitting 42 similar to that described above is connected to one end of this base metal fitting 41 by rivets 43 . Clamp tongues 44, 44 are cut and raised at the tip of the clamp fitting 42, and the external power supply line 72 is clamped by caulking these clamp tongues 44, 44. Also,
A locking tongue 45 is cut and raised on the clamp fitting 42, and the locking tongue 45 is adapted to be caught in a locking recess 29 formed on the bottom surface of the connection box 28.

The tip of the base metal fitting 41 is also formed with upright guide walls 46, 46 formed by bending.

A lead metal fitting 4 is provided on the other end side of the base metal fitting 41.
7 is mounted in an electrically insulated manner, and this lead metal fitting 47 is bent as shown in FIG. 8C. At the tip of this bent part, a plug 48 and a capacitor support protrusion 49 similar to the plug 37 and capacitor support protrusion 38 of the one terminal fitting 30 are formed, facing the plug 37 and capacitor support protrusion 38. has been done. The plug 48 has
The plug terminal 39 of the other lead wire 16 is inserted, and the capacitor support protrusion 49 has a locking groove 49a in which the capacitor 6 is inserted.
The other lead wire 61b of 0 is inserted.

A bimetal switch 50 as a circuit breaker is attached to the base metal fitting 41. The bimetal switch 50 includes a support plate 51 attached to a base metal fitting 41 by means such as welding, and a bimetal piece 52 whose one end is supported by means such as welding to the support plate 51.
, a movable contact 53 attached to the free end of the bimetal piece 52, and a fixed contact 54 provided insulated from the base metal fitting 41. In addition,
The longitudinal direction of the bimetal piece 52 is the base metal fitting 4.
1 along the longitudinal direction.

The fixed contact 54 is electrically connected to the lead metal fitting 47, and therefore the base metal fitting 41 and the lead metal fitting 47 are electrically connected via the bimetal switch 50.

In this bimetal switch 50, when the ambient temperature rises, the bimetal piece 52 thermally deforms, and the movable contact 53 separates from the fixed contact 54, as shown by the imaginary line in FIG. The metal fitting 41 and the lead metal fitting 47 are de-energized.

Terminal fittings 30, 40 with such a configuration
are the insertion holes 25 and 26 from the inside of the end cover 2, respectively.
inserted into. This insertion causes the clamp fittings 32 and 42 to connect to the respective connection boxes 27 and 28.
When reaching this point, the locking tongues 35 and 45 are caught in the locking recesses 29 and 29, respectively, so that these terminal fittings 30 and 40 are locked to the end cover 2.

In this engaged state, the plugs 37 and 48 of each terminal fitting 30 and 40 located inside the end cover 2 and the capacitor support protrusion 3
8 and 49 are arranged near the spring holding protrusions 22 and 22, and the plugs 37 and 48 and the capacitor supporting protrusions 38 and 49 are spaced apart from each other and face each other. In addition, the capacitor support protrusion 38,
The rear end 38b of the cap 49 is fitted into the fitting groove 24 formed on the inner surface of the end cover 2, thereby positioning the capacitor support protrusions 38, 49 and preventing rattling.

In this state, the brushes 15, 15, to which the lead wires 16 have been welded in advance, are attached to the brush holder 14,
14 and connected to the lead wire 16 are inserted into the plugs 37 and 48, respectively.

Further, torsion coil springs 19, 19 are attached to the spring holding protrusions 22, 22, and the brushes 15, 15 are pressed and biased by these torsion coil springs 19, 19.

Further, by inserting the lead wires 61a, 61b of the capacitor 60 into the locking grooves 38a, 49a of the capacitor support projections 38, 49, the capacitor 60 is mechanically supported and electrically connected.

On the other hand, the connection box 2 located outside the end cover 2
7 and 28, external power supply lines 71 and 72 are introduced along the outer surface of the worm gear box 9 and along the axial direction of the worm shaft 10, and the external power supply lines 71 and 72 are connected to the ends of the terminal fittings 30 and 40. The power supply lines 71 and 72 are connected by bending and caulking the respective clamp tongues 34 and 44. Thereafter, the connection portions between each clamp tongue piece 34, 44 and the external power supply lines 71, 72 are soldered.

Next, the connection boxes 27 and 28 are filled with insulating hot melt resin 80 (shown in FIG. 4) in order to insulate and waterproof the exposed portions of the wire connections. The insulating hot melt resin 80 used is one that dries quickly and has high adhesive strength.

The effects of the configuration of this embodiment will be explained.

The motor case 1 is attached to an end cover 2 that also serves as a worm gear box 9 that closes one end of the motor case 1.
Brush holders 14, 14 are provided facing each other in a direction intersecting the flat direction of the brush holders 14,
Since the brushes 15, 15 that are in sliding contact with the commutator 5 are attached to the commutator 14, the motor case 1 can be kept in a flat shape, and the motor case 1 can be aligned with the flat shape of the worm gear box 9 to flatten the entire motor case 1. becomes possible.

Terminal fittings 30, 40 for supplying power to the brushes 15, 15 are led out to connection boxes 27, 28 formed on the outer surface of the end cover 2, and connected to external power supply lines 71, 72 within these connection boxes 27, 28. By doing so, you can secure enough work space and avoid interference from other parts, so the external power supply line 7
1, 72 is extremely easy to connect.

Moreover, when soldering the terminal fittings 30, 40 and the external power supply lines 71, 72, it is done inside the connection boxes 27, 28, so even if solder resin flows, it will not flow outside the connection boxes 27, 28. . Similarly, when insulating and waterproofing the exposed portions by filling with the insulating hot melt resin 80, the insulating hot melt resin 80 does not flow out of the connection boxes 27, 28, and reliable coverage can be achieved.

Furthermore, since the connection boxes 27 and 28h are formed on the opposite side of the worm gear box 9 with the worm shaft 10 in between, this location is a surplus space of the worm gear box 9, and this surplus space can be utilized effectively. The outer shape of the electric motor can be made flat without increasing its size.

On the other hand, terminal fittings 30, 40 and brush 1
5 and 15 are connected to the plug-in terminals 3 of the lead wires 16 and 16 which are connected to the brushes 15 and 15 externally in advance.
9, 39 into the plugs 37, 48 of the terminal fittings 30, 40, there is no need to solder inside the end cover 2, and the connection work is easy because it is simply inserted. becomes.

In addition, the capacitor 60 also has its lead wire 61
a, 61b, capacitor support protrusions 38, 49
Mechanical and electrical connections are made by fitting into the respective locking grooves 38a and 49a, so soldering is not necessary and the connection work becomes easy.

Furthermore, a brush holder 1 is provided on the inner surface of the end cover 2.
4, 14, the spring holding protrusions 22, 22 and the fitting grooves 24, 24 are integrally molded.
By flattening the electric motor, complications such as those that occur when separate parts are installed in a space where the parts are arranged in high density can be prevented.

Also, a bimetal switch 50 as a circuit breaker is connected to one terminal fitting 4.
0, the bimetal switch 50 can be attached to the terminal fitting 40 externally in advance, and the bimetal switch 50 can be assembled at the same time as the terminal fitting 40 is assembled into the end cover 2. . In this case, since the longitudinal direction of the bimetal switch 50 is aligned with the longitudinal direction of the terminal fitting 40, extra space of the end cover 2 is not required, and the bimetal switch 50
can be accommodated in a small space, and the end cover 2
does not become large. Since the bimetal switch 50 can be housed inside the wall of the end cover 2, it can be installed at a position away from the brushes 15, 15 and the capacitor 60, and the creepage distance can be secured. These bimetal switch 50, brushes 15, 15, and capacitor 60 can be arranged rationally.

Note that the present invention is not limited to the configuration of the above embodiment.

That is, although the terminal fittings 30 and 40 are constructed by joining a base fitting, a clamp fitting, and a lead fitting to each other, the terminal fittings 30 and 40
may be an integrally molded product.

In addition, terminal fittings 30 and 40 and brush 1
In short, any other connection structure other than soldering may be used for the connection structure 5 and 15.

In addition, various modifications are possible within the scope of the gist of the present invention.

[Example of idea]

As explained above, according to the present invention, brush holders are provided on the end cover that closes one end of the motor case so as to face each other in a direction intersecting the flat direction of the motor case, and the commutator and the brush holders are in sliding contact with each other. Since the brush is attached, the motor case can be kept in a flat shape, and the whole can be made flat by aligning it with the flat shape of the worm gear box.
Then, a terminal fitting located on the opposite side of the worm gear box with the worm shaft in between is inserted into the end cover, and the inner end of this terminal fitting is connected to the brush, and the outer end is formed on the end cover. Since the outer end of the terminal fitting and the power supply line are connected inside this connection box, the soldering point is set outside and away from the area around the brushes inside the motor case. If the work is done outside, the work space will be large and work efficiency will be improved. Furthermore, since this connection box is formed on the opposite side of the worm gear box across the worm shaft, this area is a surplus space of the worm gear box, and this surplus space can be used effectively, making the entire motor larger. Not only does it not occur, but it is even more effective in flattening the surface.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view of the entire small electric motor partially cut away, Fig. 2 is a view taken along the line - in Fig. Figure 4 is a sectional view taken along the line - in Figure 3, Figure 5 A, B, and C show the inner surface structure of the end cover, and Figure 5 A is the inner surface of the end cover. A front view showing
Figure 5B is an arrow view of line B in Figure 5A, Figure 5C
is a view taken along line C-C in Fig. 5A, Fig. 6 is an exploded perspective view to explain the installation state of the brush, and Fig. 7 A, B, C, D, and E are one terminal fitting. 7A is a plan view, FIG. 7B is a view taken in the direction of B in FIG. 7A, FIG. 7C is a view taken in the direction of C in FIG. Figure 7 A, D-
7E is a cross-sectional view taken along line D, FIG. 7E is a view taken in the direction of the arrow E in FIG. 7A, FIGS. , Figure 8B is a sectional view taken along line B-B in Figure 8A, Figure 8C
is the arrow view of Figure 8A-C, and Figure 8D is the arrow view of Figure 8A.
It is a sectional view taken along the middle line DD. 1... Motor case, 2... End cover, 3... Field, 4... Armature, 5... Commutator, 6... Motor shaft, 9... Worm gear box, 10... Worm shaft, 12... ... Worm foil, 14 ... Brush holder, 15 ... Brush, 16 ... Lead wire,
25, 26...Insertion hole, 27, 28...Connection box, 30, 40...Terminal fitting, 50...
Bimetal switch, 60... Capacitor, 7
1,72...External power supply line.

Claims (1)

[Claims for Utility Model Registration] (1) A worm gear box is integrally formed with an end cover that closes one end of the motor case, and a worm gear and a worm shaft that mesh with the worm gear are housed in the worm gear box, and the worm gear box is housed in the motor case. In a small electric motor in which the worm shaft is connected to the output shaft of the armature and the rotation of the output shaft is transmitted to the worm shaft to drive the worm gear, the motor case is arranged in the same direction as the flat shape of the worm gear box. The motor case has a flat shape, and a brush holder is provided facing each other so as to sandwich the commutator in the end cover that is attached to the motor case.
The direction in which these brush holders face each other is a direction that intersects the flat direction of the motor case, brushes that come into sliding contact with the commutator are attached to these brush holders, and a worm gear box is mounted on the end cover with the worm shaft in between. A terminal fitting is inserted along the axial direction of the worm shaft, the inner end of the terminal fitting is connected to the brush, and the outer end faces a connection box formed on the end cover. A small electric motor characterized in that a power supply line is wired along the axial direction of the worm shaft on the outer surface of the worm gear box, and the power supply line and the outer end of the terminal fitting are connected within the connection box. feeder connection structure. (2) Utility model registration claim 1, characterized in that a bimetal switch as a circuit breaker is attached to the terminal fitting, and the longitudinal direction of the bimetal switch is aligned with the axial direction of the worm shaft. Feed line connection structure for small electric motors as described in .