JPH073275U - Small motor - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a small motor which can be easily assembled without interference with a capacitor and / or a working jig during assembly work. A small motor including a case to which a permanent magnet is fixed, a rotor including an armature and a commutator, and a case cap provided with an input terminal for power supply, a brush and a capacitor, and an outer end surface of the case cap. An engaging portion is provided between the slit and the recess so that the lead wire of the capacitor connected between the input terminals is engaged with the engaging portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a small motor used in, for example, audio equipment, precision equipment, and electrical equipment for automobiles, and more particularly to a small motor having a capacitor connected between input terminals.

[0002]

[Prior art]

 FIG. 10 is a vertical sectional front view of an essential part showing an example of a conventional small motor. In FIG. 10, reference numeral 1 denotes a case, which is formed of a metal material such as soft iron into a hollow cylindrical shape with a bottom, and has an inner peripheral surface to which a permanent magnet 2 formed in the shape of, for example, an arc segment is fixed. In this case 1, a rotor 5 composed of an armature 3 facing the permanent magnet 2 and a commutator 4 can be interposed. Next, 6 is a case cap, which is made of an insulating material such as a resin material and is fitted into the opening of the case 1. Reference numeral 7 denotes a brush, and a sliding contact piece provided at a free end is provided so as to be slidably engaged with the commutator 4, and is attached to the case cap 6 together with an input terminal 8 electrically connected to the brush 7. It is provided. Reference numerals 9 and 10 denote bearings, which are fixed to the bottom portion of the case 1 and the central portion of the case cap 6, respectively, and rotatably support the shafts 11 and 12 constituting the rotor 5.

With the above structure, the current is supplied from the input terminal 8 to the armature 3 via the brush 7 and the commutator 4 forming the rotor 5, so that the case 3 is fixed to the inner peripheral surface of the case 1. The rotating force is applied to the armature 3 existing in the magnetic field formed by the permanent magnet 2 and the rotor 5 can be rotated, and an external device (not shown) can be driven through the output side shaft 11. Can be driven.

In the small motor having the above structure, there is an example in which a capacitor is connected between the input terminals 8 and 8 in order to reduce electric noise generated during use. In this case, the space in the case 1 is Since it is narrow, it is usually provided mainly on the outer end surface of the case cap 6.

[0005]

[Problems to be solved by the device]

 As described above, the small-sized motor having the structure in which the capacitor is attached to the outer end surface of the case cap 6 has a problem that the assembling work is complicated. First, in FIG. 10, when the case cap 6 is fitted into the opening of the case 1, after inserting the rotor 5 into the case 1, the free ends of the pair of brushes 7 provided on the case cap 6 are opened. It is necessary to fit it in a closed state.

In this case, it is customary to insert an opening jig through an arcuate slit (not shown) provided in advance in the case cap 6 to open the free end of the brush 7. However, since the above-mentioned capacitor is mounted on the outer surface of the case cap 6, the opening jig may interfere with the capacitor main body and / or the lead wire in a free state. Therefore, as a result of the operation of the opening jig being unsmooth, there is a problem that the fitting of the case cap 6 into the case 1 is hindered.

Further, there is a risk that the main body of the capacitor may be damaged or the lead wire may be cut due to the interference, and there is a problem that the function of the capacitor for electrical noise reduction mounted at a corner cannot be exhibited.

Further, after the case cap 6 is fitted into the opening of the case 1, the locking claws provided in the opening of the case 1 are bent to integrally fix the case 1 and the case cap 6. Also in this case, the jig for bending or crimping may interfere with the capacitor body and / or the lead wire in the free state, and there is the same problem as described above.

As a means for preventing the work jig from interfering with the capacitor body and / or the lead wire at the time of assembly, it may be possible to mount the capacitor after the case 1 and the case cap 6 are assembled and fixed. However, if such a means is adopted, there are problems that the change of the assembly line is spread and the connection with other components becomes complicated, and the feasibility is low.

The present invention solves the above-mentioned problems existing in the prior art, and provides a small motor that can be easily assembled without interference between the capacitor and / or the lead wire and the working jig during the assembly work. The purpose is to provide.

[0011]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, a case formed of a metallic material in the shape of a hollow cylinder with a bottom and a permanent magnet fixed to the inner peripheral surface, an armature and a commutator facing the permanent magnet. And a brush fitted in the opening of the case and slidably engaged with the commutator, and electrically connected to the brush directly or through another conductive member. A case cap provided with an input terminal, the case cap provided with a pair of opposed arc-shaped slits, and a pair of recesses for allowing the caulked portion of the case end to enter. In a small motor in which the rotor is rotatably supported via bearings provided on the bottom of the case and the case cap, a locking portion is provided between the slit on the outer end surface of the case cap and the recess. Projected, Capacitor lead connected between the terminals engaged with the locking portions, employing the technical means of.

[0012]

[Action]

 With the above configuration, it is possible to easily assemble and obtain a small motor without changing the conventional production process and without any interference with the working jig.

[0013]

【Example】

 1 and 2 are a plan view and a bottom view, respectively, showing a case cap according to an embodiment of the present invention, FIG. 3 is a sectional side view taken along the line CC of FIG. 1, and FIG. 1A is a sectional view taken along the line DD in FIG. 1, FIG. 6B is a sectional view taken along the line EE in FIG. 1, and FIG. 7C is a sectional view taken along the line BB in FIG. It shows with a code.

1 to 4, the case cap 6 is formed into a substantially cup shape with an insulating material such as a resin material, and a hollow cylindrical connecting member 41 is integrally projectingly provided on the outer end surface thereof. . Reference numerals 81 and 82 denote a pair of input terminals, which are formed as will be described later, and are inserted and fixed in a through hole 42 having a T-shaped through-hole 42 provided in the case cap 6. The free ends of the input terminals 81 and 82 are provided so as to project into the connecting member 41.

Next, reference numeral 43 is a connection terminal, which is formed in a substantially L shape, is provided on the case cap 6 via a mounting member 44, and is formed so that the connection end projects from the outer end surface of the case cap 6. . The brush 7 having a substantially L shape and having a sliding contact piece 45 at its free end is connected to the connecting terminal 43 inside the case cap 6. The one connection terminal 43 and the input terminal 81 are electrically connected through the conductive member 46, and the capacitor 47 is electrically connected between the connection terminals 43 and 43 through the lead wire 60.

It should be noted that one of the lead wires 60 is integrally projectingly provided on the outer end surface of the case cap 6 and is engaged with an engaging portion 61 formed in an inverted L shape. Reference numeral 48 denotes a sandwiching member, which is made of a conductive material and has a substantially U-shape, as will be described later. Inside the case cap 6, one leg is in contact with the connection terminal 43 and the other leg is connected to the input terminal 82. The positive temperature coefficient thermistor 49 formed in a substantially quadrangular shape in cooperation is provided so as to sandwich it.

With the above structure, as shown in FIG. 10, the case cap 6 is fitted into the opening of the case 1, and the locking claw (not shown) provided in the opening of the case 1 is attached to the case cap 6. The case 1 and the case cap 6 can be integrally assembled by bending the inside of the locking portion 50 provided in the. In this case, since one of the lead wires 60 of the capacitor 47 is locked by the locking portion 61, the work jig for bending the locking claw does not interfere with the capacitor 47 and / or the lead wire 60. Absent.

The positive temperature coefficient thermistor 49 provided on the case cap 6 has a characteristic that the internal resistance value rapidly increases when the temperature exceeds a certain temperature (for example, 100 ° C.). Therefore, if an overload is continuously applied to the small motor or the temperature of the small motor rises due to an overcurrent that flows when the rotation of the rotor 5 is forcibly locked, the inside of the positive temperature coefficient thermistor 49 is increased. Since the resistance value rapidly increases, the current supplied to the small motor decreases rapidly, and it is possible to prevent the small motor from overheating. The capacitor 47 connected between the connection terminals 43 and 43 is for reducing the electrical noise generated from the small motor.

Next, the configuration of the input terminals 81 and 82 will be described. 5 and 6 are explanatory views showing the input terminals 81 and 82 in FIG. 1, FIG. 2 and FIG. 4, respectively (a) is a cross section, (b) is a left side surface and FIG. 5 (c) is a bottom surface. Indicates. First, in FIG. 5, the input terminal 81 is provided with the stopper portion 51 at the lower end portion by forming the cross section of the input terminal 81 into a substantially L shape with a conductive material. Next, a cut-and-raised tongue piece portion 52 is provided in the intermediate portion, and a cut-and-raised protrusion portion 53 is provided in the stopper portion 51.

On the other hand, in FIG. 6, similarly to the input terminal 81 shown in FIG. 5, the input terminal 82 is made of a conductive material and has a substantially L-shaped cross section, and the stopper portion 51 is cut at the lower end portion and cut at the middle portion. A tongue piece 52 is provided. Reference numeral 54 denotes a protrusion, which is provided between the stopper 51 and the cut and raised tongue piece 52 so as to project toward the cut and raised tongue piece 52 side. In order to form the input terminals 81 and 82 as described above, it is preferable to use press molding means.

FIG. 7 is an explanatory view showing the sandwiching member 48 in FIGS. 2 and 4, wherein (a) shows a side surface and (b) shows a front surface. 8 and 9 are a view in the F 2 direction in FIG. 7A and a view in the G direction in FIG. 7B, respectively. In FIGS. 7 to 9, the sandwiching member 48 is formed of a conductive elastic metal material into a substantially U shape having legs 55a and 55b. The angle between the legs 55a and 55b is, for example, 120 ° in FIG. 7A.

The tip portion of the leg portion 55a is formed in a fork shape into, for example, three divided pieces, and the central divided piece 56 is provided with a cut and raised tongue piece portion 57, and the divided pieces 58 on both sides are the cut and raised tongue pieces. A sandwiching portion is formed by bending and projecting to the protruding side of the piece portion 57. Reference numeral 59 denotes a hole, which is provided at the tip of the other leg 55b and serves to improve the locking action of the sandwiching member 48 with the case cap 6 (see FIGS. 1 to 4) described later.

A mode of mounting the input terminals 81, 82 and the sandwiching member 48 on the case cap 6 with the above configuration will be described. First, the input terminals 81 and 82 are inserted into the through hole 42 from inside the case cap 6, that is, from below in FIG. In this case, since the through hole 42 is formed in a T-shaped cross section as shown in FIG. 1, the cut-and-raised tongue piece 52 is formed in the middle portion as shown in FIGS. 5 and 6. It is extremely easy to insert the input terminals 81 and 82 formed by projecting into the through hole 42.

Next, the input terminals 81 and 82 are inserted until the stopper portions 51 thereof come into contact with the end surfaces of the case cap 6, and then the cut-and-raised tongue portions 52 are made substantially perpendicular to the surfaces of the input terminals 81 and 82. By bending, the input terminals 81 and 82 are fixed to the case cap 6. Therefore, it is possible to secure the pull-out resistance of the input terminals 81 and 82 in the longitudinal direction. A processing jig can be used to bend the cut-and-raised tongue portion 52, but the processing direction in this case is the longitudinal direction of the input terminals 81 and 82, and therefore the connecting member 41 is present in the vicinity. However, no interference occurs during processing.

After fixing the input terminals 81 and 82, as shown in FIG. 4A, the cut and raised protrusion 53 is plastically deformed upward, and the end portion of the conductive member 46 is sandwiched between the input terminal 81 and the conductive terminal 46. The member 46 is electrically connected. Next, as shown in FIG. 2, the sandwiching member 48 is inserted into a predetermined position of the case cap 6 together with the connecting terminal 43 and the brush 7, and is fixed via the mounting member 44. As a result, the above members are securely connected not only mechanically but also electrically.

On the other hand, since the leg portion 55a of the sandwiching member 48 shown in FIGS. 7 to 9 faces the input terminal 82 with a slight gap as shown in FIGS. It is easy to insert the positive temperature coefficient thermistor 49, and the insertion of the positive temperature coefficient thermistor 49 allows the split piece 58 and the cut and raised tongue piece which were in the bent state and the inclined state in the free shape as shown in FIGS. 8 and 9. All the parts 57 are elastically deformed in the horizontal state. Therefore, the positive temperature coefficient thermistor 49 can be reliably held between the positive characteristic thermistor 49 and the projection 54 of the input terminal 82. On the other hand, even if an external force in the pulling direction acts on the positive temperature coefficient thermistor 49 from this state, the cut-and-raised tongue portion 57 acts so as to bite into the positive temperature coefficient thermistor 49, so that the pulling resistance can be increased and reliability can be improved. improves.

After assembling as described above, as shown in FIGS. 1 and 3, it is connected to the projecting end of the connection terminal 43 via the lead wire 60 of the capacitor 47, for example, by soldering. In this case, the end portion of the conductive member 46 is also soldered to the connection terminal 43 together with the lead wire 60, and the electrical connection is secured.

When the case cap 6 formed as described above is fitted into the opening of the case 1 shown in FIG. 10, an opening jig is inserted into the arc-shaped slit 62 provided in the case cap 6. Then, the free end of the brush 7 shown in FIG. 2 is opened, but one of the lead wires of the capacitor 47 (see FIG. 1) is locked by the locking portion 61, so that the opening jig is It does not interfere with the lead wire 60.

In the present embodiment, a hollow cylindrical connecting member 41 is projected on the outer end surface of the case cap 6, the input terminals 81 and 82 are present in the connecting member 41, and the brush 7 is made of another conductive member. Although the description has been given of the configuration in which the input terminals 81 and 82 are electrically connected via the, the present invention has a small configuration in which the input terminal 8 and the brush 7 are directly connected as shown in FIG. Of course, it can also be applied to a motor.

[0030]

EFFECTS OF THE INVENTION Since the present invention has the configuration and operation as described above, the following effects can be obtained.

(1) Since the lead wire of the capacitor mounted on the outer end surface of the case cap is completely fixed in the locking portion, the work jig used in the assembly of the case and the case cap is There is no interference, and the assembly work can be performed easily.

(2) In connection with the above (1), since the capacitor and / or the lead wire is also free from damages due to the interference with the work tool, the reliability of the small motor can be improved. You can

[Brief description of drawings]

FIG. 1 is a plan view showing a case cap according to an embodiment of the present invention.

FIG. 2 is a bottom view showing a case cap according to an embodiment of the present invention.

3 is a partial cross-sectional side view taken along the line CC of FIG.

4A and 4B are sectional views of a main part of a case cap according to an embodiment of the present invention, in which FIG. 4A is a sectional view taken along the line DD in FIG. 1, FIG. Figure 1
3 shows a cross section taken along line BB in FIG.

5 is an explanatory view showing an input terminal 81 in FIGS. 1, 2 and 4, (a) being a cross section, (b) being a left side surface, FIG.
(C) shows a bottom surface.

6A and 6B are explanatory views showing an input terminal 82 in FIGS. 1, 2, and 4, in which FIG. 6A shows a cross section and FIG. 6B shows a left side surface.

7A and 7B are explanatory views showing a sandwiching member 48 in FIGS. 2 and 4, where FIG. 7A is a side view and FIG. 7B is a front view.

FIG. 8 is a view on arrow F in FIG. 7 (a).

9 is a view in the direction of arrow G in FIG. 7 (b).

FIG. 10 is a sectional front view of an essential part showing an example of a conventional small motor.

[Explanation of symbols]

 6 Case cap 47 Capacitor 50 Recessed portion 60 Lead wire 61 Locking portion 62 Slit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryoichi Someya 280 Ryuko-ji Temple, Motonomura, Inba-gun, Chiba Mabuchi Motor Co., Ltd. Technical Center

Claims (1)

[Scope of utility model registration request] 1. A case (1) formed of a metallic material in the shape of a hollow cylinder with a bottom and having a permanent magnet (2) fixed to its inner peripheral surface, and an armature (3) facing the permanent magnet (2). )
And a commutator (4), a brush (7) fitted in the opening of the case (1) and slidingly engaged with the commutator (4), and this brush (5). And a case cap (6) provided with input terminals (81) and (82) electrically connected to 7) directly or through another conductive member (46). 6) a pair of opposing arcuate slits (62),
A pair of recesses (50) for allowing the caulked portions at the ends of the case (1) to enter, and a bearing (9) provided on the bottom of the case (1) and the case cap (6),
In a small motor in which the rotor (5) is rotatably supported via (10), a locking part () is provided between the slit (62) on the outer end face of the case cap (6) and the recess (50). 61) projectingly provided, and a capacitor (4) connected between the input terminals (81) and (82).
A small motor characterized in that the lead wire (60) of 7) is locked to the locking portion (61).