JP3131337B2 - Small electric motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small electric motor having a divided rectifying section, and more particularly to a small electric motor having an improved assembling operation.

[0002]

2. Description of the Related Art As a small electric motor of this kind, the present applicant has previously proposed a small motor applied to a power window device of an automobile in Japanese Utility Model Application No. 4-77588. FIG. 6 is a schematic diagram showing the structure of this motor.
And a gear portion G for reducing the output of the main body case.
And the motor case 200 accommodating the motor unit M are separately formed, and the conductive brush contacting the rectifying piece 202 provided on the rotating shaft 201 of the motor unit M is separated from the main body case 100 and the motor case 200 by The rocker ring 300 is configured as a separate rocker ring 300.
0 is sandwiched between the main body case 100 and the motor case 200.

In this small motor, a motor case 200
The motor shaft 201 protruding from the rocker ring 3
00, the gear 203 provided at the end of the motor rotating shaft 201 meshes with the gear in the main body case 100, and the conductive brush 301 of the rocker ring 300 is fitted to the rectifying piece 202 provided at the intermediate portion of the rotating shaft 201. Contact. The power supply line 101 connected to the conductive brush 301
Is inserted through the inside of the main body case 100, and the tip end is connected to the connection terminal 302 of the rocker ring 300 by connector connection or soldering.

[0004]

However, when assembling this small motor, particularly when soldering is adopted as a structure for connecting the power supply line 101 to the connection terminal 302 of the rocker ring 300, the connection terminal 302 is connected to the rocker ring 300. Since the rocker ring 300 is tilted 90 degrees from the original mounting posture, as shown by the imaginary line in FIG. The distal end is soldered with a soldering iron H, and then the rocker ring 300 is returned to its original position and then fitted into the opening provided in the main body case 1. For this reason, at the time of soldering, it is necessary to pull out the power supply line 101 from the main body case 100 by a length necessary for tilting the rocker ring 300,
Further, when the rocker ring 300 is fitted to the main body case 100 after the soldering is completed, it is necessary to return the power supply line 101 in the opposite direction, and there is a problem that these operations are troublesome and time-consuming.

Further, when the rocker ring 300 is returned to its original position from a state in which the rocker ring 300 is fitted to fit the case into the case, a bending force is generated in the power supply line 101, and particularly, a portion of the connection terminal 302 soldered. This bending force acts, and depending on the state of soldering, the solder may come off and reliability may be reduced. An object of the present invention is to simplify the work of connecting a power supply line to a rocker ring,
An object of the present invention is to provide a small electric motor with improved reliability of the connection structure.

[0006]

According to the present invention, a rocker ring for supporting a conductive brush is formed separately from a motor case and a main body case, and a power supply line passing through the main body case is connected to a connection terminal provided on the rocker ring. In a small electric motor configured to be soldered, the rocker ring has a cutout in a part of a peripheral wall portion corresponding to a place where the power supply line is inserted, and is arranged in a state where the connection terminal is exposed in the cutout. The power supply line is soldered, and the soldered portion is configured not to be exposed to the outside of the electric motor when the rocker ring is sandwiched between the motor case and the main body case. Indicates that the feed line is inserted
A seal box is provided at the location where
Box is filled with a sealant, and
Is sealed .

[0007]

Next, the present invention will be described with reference to the drawings. Here, an example in which the present invention is applied to a small motor as a drive source of a power window device used in an automobile is shown. FIG. 1 is a sectional view thereof. In FIG. 1, a main body case 1 is formed of a resin material, screws 2 for fixing to a vehicle body of a vehicle are erected at a plurality of positions, and a worm wheel 13 is provided inside the screw 2. A motor 4 is attached to an opening 3 provided in a part of the side surface of the main body case 1. The motor 4 is provided with a rotating armature or the like in a cylindrical motor case 5, and a rotary shaft 7 having one end supported on the motor case 5 and the other end mounted on the main body case 1 by bearings 6 at the center position. The rotor 8 is provided with a rotor 8 composed of an iron core and a coil.

A stator 9 made of a magnet is attached to the inner peripheral surface of the motor case 5. Further, a cylindrical collar 11 made of an insulating material is fixed to the rotary shaft 7, and a rectifying piece 10 is provided on the outer peripheral surface of the cylindrical collar. A conductive brush 21 provided on a rocker ring 20 fitted and supported in the opening 3 of the main body case 1 is brought into sliding contact with the rectifying piece 10 to form a brush portion. A worm gear 12 is provided integrally with the other end of the rotary shaft 7. The worm gear 12 meshes with a large-diameter worm wheel 13 supported in the case 1. The worm wheel 13 is integrally provided with a pulley (not shown), around which a wire for opening and closing the vehicle window is wound.

FIG. 2 shows a partially cutaway perspective view of the rocker ring 20, FIGS. 3 (a) to 3 (c) show a front view, a rear view and a side view thereof, and FIG. As shown in a longitudinal sectional view of a portion along the line A, a peripheral wall portion 22 having a substantially cylindrical shape having a circular cross-sectional shape with both sides cut away.
And a support plate portion 23 integrally formed inside the peripheral wall portion 22.
The motor case 5 is opposed to the opening 3 of the main body case 1 and is fixed to the main body case 1 by the motor case 5 attached to the opening 3 with a screw. The motor 4 is located at the center of the support plate 23.
A shaft insertion hole 24 through which the rotary shaft 7 is inserted is opened, and a pair of square cylindrical brush holders are provided on both sides of the shaft insertion hole 24 on the motor side surface of the support plate 23. 25
Are arranged to face each other.

A conductive brush 21 is inserted into each of the brush holders 25, and is held in a radial direction by a pair of torsion springs 26 which are elastically supported on a support plate 23. Rectifying piece 1 provided on 7
0 is touched. In this case, the peripheral wall portion 22 of the rocker ring 20 is partially cut away in a portion close to the brush holding portion 25, and the columnar portion 27 and the hook portion 28 are set up on the support plate portion 23 in the cutout portion. Set up, cylindrical part 2
7, the torsion spring 26 is fitted, and one end of the torsion spring 26 is elastically contacted with the outer end surface of the conductive brush 21 through the groove of the brush holding portion 25, and the other end is hooked on the hook portion 28. Then, the conductive brush 21 is urged in the inner diameter direction. The upper edge of the hook portion 28 has a tapered side 28.
Since the taper side 28a is used to guide the other end of the torsion spring 26, the work of hooking the other end on the hook portion 28 can be easily performed.

The peripheral wall 2 of the rocker ring 20
The flat portion on the upper side of 2 is provided with a pair of cutout portions 22a by cutting out portions on both sides thereof. And
A pair of lead strips 29 obtained by bending metal strips are supported by the support plate 23. The other end 29a of each of the lead strips 29 is located in the notch 22a as a connection terminal, and each of the lead strips 29 is positioned on the outside. Is bent in an inverted L-shape. These lead strips 29 are electrically connected to the conductive brushes 21 by flexible electric wires 30, respectively. A breaker 29b (see FIG. 3B) that is turned off when an overcurrent occurs is provided in a part of the lead strip 29.

In FIG. 3, a part of the electric wire 30 is hooked on a projection 25a provided on the brush holder 25. In this state, the conductive brush 21 is retracted into the brush holder 25. ing. In this state, when the rotating shaft 7 is inserted into the shaft insertion hole 24 and then the hook of the electric wire 30 is released, the conductive brush 21 is protruded inward as shown in FIG. Will be.
Then, the peripheral wall portion 22 at a position sandwiched between the notches 22a
b, a disk-shaped capacitor 31 is mounted in a gap provided between the support plate 23 and the lead wire 3 of the capacitor 31.
1a is wound around each connection terminal 29a of the lead strip 29.

On the other hand, the opening 3 of the main body case 1 is formed as a fitting recess 40 having a shape corresponding to the shape of the peripheral wall 22 of the rocker ring 20.
The rocker ring 20 is fitted therein. This fitting recess 4
An insertion groove 42 into which a power supply line 41 to be described later is inserted is provided in a part of the main case 1 along the outer surface of the main body case 1. An end wall 43 is provided at the end of the insertion groove 42, the outer wall of the main body case 1 is removed at a portion near the end, and the upper portion is opened at this portion, and along the opening edge. The partition wall 51 is formed by these steps, and these walls constitute a container-shaped seal box 44. A cutout 45 through which the power supply line 41 is inserted is formed in the end wall 43, and an elliptical insertion hole 52 through which the power supply line 41 is inserted is formed in the partition wall 51. Further, a bearing portion 4 having an insertion hole through which the rotary shaft 7 is inserted is inserted into the fitting recess 40 of the opening 3.
6 is integrally provided, and a plate-shaped eave 47 projecting in the axial direction is integrally formed at a flat portion on the upper side of the fitting concave portion 40, in other words, at a position facing the flat portion on the upper side of the rocker ring 20. Is formed.

In the insertion groove 42, a pair of power supply lines 41 are inserted through the seal box
It is inserted up to. The tip of the power supply line 41 is connected to a connection terminal 29a provided on the rocker ring 20 by soldering. The power supply line 41 is provided with a notch 45 in the end wall 43.
The seal box 44 is filled with a sealant 48 such as a hot melt resin. Thereby, the portion where the power supply line 41 is connected to the connection terminal 29a and the power supply line 41
Is partially embedded in the seal box 44, and a part thereof is buried by the sealant 48, the insertion groove 42 is completely sealed by the sealant 48, and the moisture enters the main body case 1 through the insertion groove 42. Intrusion is prevented, and the waterproofness of the main body case 1 is enhanced.

In the small motor constructed as described above, when assembling it, as shown in FIG.
Are soldered to the connection terminals 29a of the rocker ring 20, respectively, in a state where the front ends of the rocker rings 20 protrude from the fitting recesses 40 after passing through the insertion grooves 42. When soldering the power supply line 41 and the connection terminal 29a, the connection terminal 29
a is arranged in the cutout portion 22 a provided in the upper peripheral wall portion 22 of the rocker ring 20,
Can be performed in an upright state as shown in the figure, and it is not necessary to tilt the rocker ring by 90 degrees as in the related art, and the workability is improved. Further, at this time, the power supply line 41 can be connected only by slightly projecting the tip from the fitting recess 40, and it is almost unnecessary to draw out the power supply line 41.
Further, at the same time as the power supply line 41 is soldered to the connection terminal 29a, the lead wire 31a of the capacitor 31 previously wound around the connection terminal 29a is simultaneously connected to the connection terminal 29a.
a can be soldered.

Then, the rocker ring 20 is fitted into the fitting recess 40 while the power supply line 41 is pushed into the fitting recess 40, and the rocker ring 20 is fastened to the main body case 1 by the screw 50. Further, the rotating shaft 7 is inserted into the main body case 1 through the rocker ring 20, and the motor case 5 is fixed to the main body case 1 with screws. This allows
The rocker ring 20 is interposed between the main body case 1 and the motor case 5. In addition, the power supply line 41 in the insertion groove 42 is inserted into the notch 45, and further inserted into the insertion hole 52 of the partition wall 51, and then the sealant 48 is filled in the seal box 44. The sealant 48 is prevented from flowing toward the rocker ring 20 by the partition wall 51. Thereby, the assembly of the small electric motor of FIG. 1 is completed.

In the assembled state, the connection between the power supply line 41 and the connection terminal 29a is covered with the eaves 47. Therefore, even if a corner of the solder or the like is formed in the portion where the two are connected, the eaves 47 are used. Cover and prevent exposure to the outside. Further, since this eave 47 is located on the outer peripheral portion of the rocker ring 20, a seal ring 49 used for sealing an abutting portion between the main body case 1 and the motor case 5 is provided.
It also functions as a guide (see FIG. 1).

[0018]

As described above, according to the present invention, the rocker ring which is formed separately from the motor case and the main body case and has the conductive brush is formed by forming a part of the peripheral wall portion corresponding to the place where the power supply line is inserted. Is cut out, and a connection terminal connected to the conductive brush is provided in the notch portion in a state where the connection terminal is exposed.A power supply line is soldered to the connection terminal, and the soldered portion includes a rocker ring. Since it is configured not to be exposed to the outside of the electric motor when sandwiched between the motor case and the main body case, when soldering the power supply line and the connection terminal, the connection is made with the rocker ring tilted from its original posture It is not necessary, and soldering can be performed without pulling out the power supply line from the main body case by the length required for tilting the rocker ring. Eliminates the need to pull back within, thereby making it possible to simplify the connection work. Also, since it is not necessary to return the rocker ring to its original position after soldering the power supply line to the connection terminal, no bending force acts on the power supply line or the soldered portion, and the soldering does not come off, Reliability can be improved. Furthermore, since the connection terminals are exposed in the cutouts, the work of soldering the power supply line is easy, and the soldered parts are not exposed to the outside when the rocker ring is installed in the case. It is also effective in increasing the waterproofness of the part. Also, the body case should be
The seal box is provided with a seal box.
Filling between the power supply line and the body case
By doing so, the waterproofness of the body case can be increased
You.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an entire configuration of an embodiment of a small electric motor according to the present invention.

FIG. 2 is a perspective view of a part of FIG.

FIG. 3 is a front view, a rear view, a plan view, and a side view of the rocker ring.

FIG. 4 is a longitudinal sectional view of a location along the line AA in FIG. 1;

FIG. 5 is a plan view showing a state where a power supply line is connected to a rocker ring.

FIG. 6 is a side sectional view for explaining a schematic configuration of a conventional electric motor of this type and its problems.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 4 Motor 7 Rotating shaft 10 Rectifying piece 20 Rocker ring 21 Conductive brush 22 Peripheral wall part 25 Brush part 26 Torsion spring 29 Lead strip 29a Connection terminal 41 Power supply line

Claims (1)

(57) [Claims] 1. A rotating armature of a motor is built in a motor case, a gear mechanism meshed with a rotating shaft of the rotating armature is built in a main body case, and is contacted with a rectifying piece provided on the rotating shaft. A rocker ring for supporting the conductive brush is formed separately from the motor case and the main body case, the rocker ring is provided with a connection terminal electrically connected to the conductive brush, and the rocker ring is connected to the motor case and the main body. In a small electric motor configured to solder a power supply line having a main body case inserted therethrough after being sandwiched between the case and the connection terminal, the rocker ring has a peripheral wall corresponding to a location where the power supply line is inserted. A notch in a part of the portion, the connection terminal is disposed in an exposed state in the notch, the power supply line is soldered, and the soldered portion is When the rocker ring is sandwiched between the motor case and the main body case, the rocker ring is not exposed to the outside of the electric motor , and the main body case has the power supply line.
A seal box is provided at the place where the
The box is filled with a sealant,
A small electric motor characterized by sealing between a case and the case .