JPH0753410Y2 - Terminal device for small motors - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention is a terminal device for a small motor, especially a small motor used in, for example, a camera. The power supply terminal is covered with a cover, is easy to assemble, and the power supply from the power supply terminal is reliable. The present invention relates to a terminal device for a small motor having a structure as described in 1.

[0002]

2. Description of the Related Art FIG. 14 shows the structure of a conventional small motor. In FIG. 14, the brush device 14 that contacts the commutator 13 is composed of a brush arm 14a and a brush base 14b.
Are supported by penetrating the case lid 11 made of synthetic resin. And terminal 12, brush device 1
4 and a bearing 15 and a commutator 13 fixed to the motor shaft 16 supplies the rotor winding 19 wound around a rotor core 18 of a rotor 17 fixed to the motor shaft 16. The motor case 2
It is a small motor configured such that the rotor 17 existing in the field formed by the permanent magnet 21 fixed to the inner peripheral surface of 0 rotates.

In the conventional small-sized motor as shown in FIG. 14, the lead wire for power supply is connected to the terminal 12 provided so as to project from the case lid 11 to the outside by using connecting means such as soldering. It had been. However, recently, as a power feeding method for a small motor used in, for example, a camera, it is strongly desired to introduce an input means capable of feeding power by inserting a power feeding terminal that does not require soldering, for example, a flexible substrate. It's coming.

In order to meet such a demand, the applicant for utility model registration has previously proposed a terminal device for a small motor having the following structure (Japanese Patent Application No. 2-112284). 15 to 19 are explanatory views for explaining one embodiment thereof.
Is a side view of the case lid side of the small motor to which the invention is applied, FIG. 16 is a cross-sectional view taken along arrow A in FIG.
FIG. 17 is a sectional view taken along the arrow B in FIG. 15. In FIGS. 15 to 17, reference numeral 1 in the drawings denotes a case lid, 1-1 a terminal mounting groove, 1-2 a brush holding hole, and 1-. 3 is a terminal pressing member accommodating portion, 1-4 is a flexible substrate / stopper, 2 is a terminal, 2-1 is a terminal press-fitting portion, 2-2 is a terminal engaging portion, 3 is a terminal pressing member, 3-1 is a base portion, 3-2 is a protrusion, 3-
Reference numeral 3 is a flexible board insertion hole, 3-4 is a stopper for retaining, 3-5 is a groove portion, 4 is a flexible board, 5 is a shaft receiving plate, 6 is a crimping piece, and other reference numerals are as shown in FIG.
It corresponds to 4.

Referring to FIGS. 15 to 17, the case lid 1 in the above invention is a terminal mounting groove 1-1 for mounting the terminal 2 and a terminal press-fitting portion 2-1 formed at one end of the terminal 2 and a brush. Brush holding hole 1 into which the base 14b is inserted and the brush device 14 is held
-2, when the terminal pressing member accommodating portion 1-3 for mounting the terminal pressing member 3 and the flexible substrate 4 described later with reference to FIG. 19 are inserted, the tip of the flexible substrate 4 is locked. The flexible substrate / stopper 1-4 (shown in FIG. 17) is provided. Also, the terminal 2 in the previous invention is pressed into the brush holding hole 1-2 as shown in FIG.
The terminal press-fitting portion 2-1 which is in pressure contact with the base 14b is provided at one end, and as shown in FIG. 17, under the condition that the terminal pressing member 3 is mounted, the projection 3 of the terminal pressing member 3 is attached. -2 is provided at the other end with a terminal engaging portion 2-2 that elastically engages with -2.

FIGS. 15 to 17 show the case lid 1 incorporated in the motor case 20, that is, the case lid 1.
After press-fitting into the open end of the motor case 20, the caulking piece 6
Although the fixed state is shown by, the steps of assembling the case lid 1 will be sequentially described below.

First, as shown in FIG. 16, the shaft cover 5 serving as a thrust receiver of the motor shaft 16, the bearing 15, and the brush device 14 are incorporated in the case lid 1, and the terminal press-fitting portion 2-1 is brushed. The terminal 2 is pressed into the brush holding hole 1-2 while being pressed against the base 14b, so that the terminal 2 is inserted into the terminal mounting groove 1-1.
Attach to. In this case, since the terminal pressing member 3 has not been mounted yet, the terminal engaging portion 2-2 formed at the other end of the terminal 2 is in a free state, so that the bending angle is more horizontal than in the state shown in FIG. Has become.

Next, the case cover 1 is attached to the motor case 20.
After completion of the crimping by the crimping piece 6, the terminal pressing member 3 is mounted (the crimping by the crimping piece 6 may be carried out after the terminal pressing member 3 is mounted). Although this state is shown in FIGS. 15 to 17, the commutator, the rotor core, the rotor winding, the permanent magnet, and the like attached to the motor shaft 16 are not shown.

Now, the terminal pressing member 3 in the above invention will be described with reference to FIG. The terminal pressing member 3 is integrally formed of a base 3-1 and a protrusion 3-2. A flexible board insertion hole 3-3 is provided in the base 3-1. In addition, a stopper 3-4 for preventing coming off is provided at the tip of the protrusion 3-2.
Is provided.

The terminal pressing member accommodating portion 1-3 formed on the case lid 1 is formed so as to fit with the inner surface and both side surfaces of the base portion 3-1 and both side surfaces of the protruding portion 3-2. (Detailed illustration is omitted).
Therefore, when the terminal pressing member 3 is inserted into the terminal pressing member accommodating portion 1-3, the stopper 3-4 for retaining the stopper comes into contact with the terminal pressing member accommodating portion 1-3. By forming a groove 3-5 in the central portion of the portion 3-2 so that the protrusion 3-2 is bent, the terminal pressing member 3 can be easily inserted.

FIG. 17 shows the state of the terminal engaging portion 2-2 after the above steps are completed. That is, by mounting the terminal pressing member 3 in the above step, the tip of the terminal engaging portion 2-2 is pressed against the protrusion 3-2 of the terminal pressing member 3, and the terminal engaging portion 2-2 is , And will be elastically engaged with the protrusion 3-2.

FIG. 19 shows a state in which the flexible board 4 is mounted. That is, the flexible board 4 is inserted into the flexible board insertion hole 3-3 under the state after the above-described step shown in FIG. The flexible board 4 is inserted along the protrusion 3-2 so as to push down the terminal engaging portion 2-2 until the tip abuts the flexible board / stopper 1-4.
Therefore, the terminal engaging portion 2-2 is more strongly and elastically engaged with the flexible board 4, so that the electrical connection between the flexible board 4 and the terminal engaging portion 2-2 is ensured. In addition, the flexible substrate 4 does not easily fall off after being inserted.

[0013]

However, even in the previously proposed device, the lead portion of the terminal mounted on the case lid is exposed, and therefore, there is a risk of contact with other camera components and a short circuit. Therefore, a small motor with a structure in which the terminal is not exposed is desired.

Further, in a small motor of the type to which a capacitor for noise prevention is connected, it is desirable that the capacitor also has a structure in which the main body and its conductive portion are not exposed to the outside.

The present invention has been made in view of the above points, and has a structure in which a conductor through which electricity flows is not exposed to the outside of a small motor including a lead portion of a terminal and a body of a capacitor for noise prevention or the like. It is also an object of the present invention to provide a terminal device for a small motor, in which the electric connection between the brush base and the terminal is reliable, and the connection of a flexible substrate, which is an insertion type power supply terminal, can be easily performed. .

[0016]

In order to achieve the above object, a terminal device of a small motor according to the present invention comprises a stator and a rotor core having a permanent magnet for forming a field on an inner peripheral surface of a motor case. And a rotor having a rotor winding wound around it, and supplies current to the rotor winding through a commutator that is in sliding contact with a brush device for power supply supported by a case lid made of synthetic resin. The brush device includes a brush base that is supported by penetrating the case lid, and a brush arm that extends from the brush base and contacts the commutator. -In a terminal device of a small motor having a terminal connected to a base, a cover made of a synthetic resin material for covering the lead portion of the terminal is provided, and the cover is the above-mentioned case. The case lid includes two protrusions fitted to the lid and a terminal insertion hole into which a feeding terminal of an insertion method is inserted, and the case lid includes protrusion protrusions that respectively lock the protrusions of the cover. A terminal mounting groove for guiding the lead portion of the terminal is provided, and the terminal includes a terminal engaging portion disposed on one of the protrusion locking portions provided on the case lid, and the brush base. When the cover is fitted on the case lid after the terminal is press-fitted to be electrically connected to the terminal mounting groove, and the terminal is fitted in the terminal mounting groove, The power supply terminal is inserted along the protrusion through the terminal insertion hole, and the terminal is engaged with the protrusion with respect to the protrusion. It is characterized by being engaged Le elastically engaged.

[0017]

With the above structure, the conductor is not exposed and soldering can be eliminated.

[0018]

1 is a side view of an embodiment of the case lid side of a small motor to which the present invention is applied, FIG. 2 is a sectional view taken along arrow X in FIG. 1, and FIG. 3 is a sectional view taken along arrow Y in FIG. Shows.

1 to 3 and FIG. 5 with the cover removed, the case lid 1 has the shape structure shown in FIG. 6, and the cover 7 attached to the case lid 1 is shown in FIGS. 7 to 9. The terminal 2 has the shape structure shown in FIGS. 11 and 12.

The case lid 1 of the present invention used in FIGS. 1 to 3 and 5 is a terminal mounting groove 1-1 for mounting the terminal 2 and a terminal press-fitting portion 2-1 formed in the terminal 2. And a brush base 14b are inserted to hold the brush device 14 therein.
2, protrusion locking portions 1-5, 1-6, and chips having widths D1 and D2 for engaging the protrusions 7-1 and 7-2 of the cover 7 and fitting and fixing the cover 7 to the case lid 1. A storage portion 1-7 for storing the capacitor 8 and an assembly groove 1-8 used for press-fitting and assembling the case lid 1 into the motor case 20 are provided. The protrusion locking portions 1-5 and 1-6 are
The protrusions 7-1 and 7-2, which will be described later, are formed to have a shape that fits with each side surface, that is, wall surfaces E and F.

The terminal 2 of the present invention used in FIGS. 1 to 3 and 5 is as shown in FIG.
The brush base 1 is press-fitted into the brush holding hole 1-2.
A terminal press-fitting portion 2-1 that is in pressure contact with 4b is provided at a substantially central portion of the half moon through guide pieces 2-4 and 2-5 having a width D3. As shown in FIG. 3, the terminal engaging portion 2 that elastically engages with the protrusion 7-1 of the cover 7 under the condition that the cover 7 described later is attached to the case lid 1. -2 is provided at one end of approximately half a month of the terminal 2, and at the other end thereof, as shown in FIG. 10, a holding portion 2-3 for holding the terminals of the chip capacitor 8 in contact is provided.

While the terminal 2 described above is mounted in the terminal mounting groove 1-1 shown in FIG. 5, for example, the shape structure on the left side is described, and the terminal symmetrical to this is the other. Used as terminal 2 on the right side.

The terminal 2 shown in FIGS. 11 and 12 and a terminal symmetrical to the terminal 2 are mounted in the terminal mounting grooves 1-1 of the case lid 1 shown in FIG. 6 as shown in FIG.

The cover 7 of the present invention used in FIGS. 1 to 3 has a hole 7-10 in the center and a protrusion 7 facing each other.
-1, 7-2 and cover pieces 7-6, 7-7 are respectively provided in the direction perpendicular to the protrusions 7-1, 7-2, and the material thereof is made of a synthetic resin material. A flexible substrate insertion hole 7-3 is provided on the protrusion 7-1 side, and a fixing groove 7-8 for accommodating and fixing the chip capacitor 8 is provided on the rear surface on the protrusion 7-2 side.

The protrusion 7-2 has a width D2 which is fitted in the protrusion locking portion 1-6 provided on the case lid 1, and stoppers 7-4 for preventing slipping out are provided on both side surfaces of the tip portion thereof. A groove 7-5 is formed in the center of the groove 7-5.
Due to the formation of the groove portion 7-5, when the projection portion 7-2 is fitted to both the wall surfaces E and F of the projection locking portion 1-6, the projection portion 7-2 bends and its The width D2 is reduced so that the protrusion 7-2 can be easily fitted into the protrusion locking portion 1-6.

Similarly, the protruding portion 7-1 on the opposite side has a width D1 and is provided with stoppers 7-4 for preventing slippage on both side surfaces of the tip portion and a groove portion 7-5 in the central portion. The tip of the flexible board 4 is locked inside the tip of the protrusion 7-1 when the flexible board 4 described later with reference to FIG. 4 is inserted into the flexible board insertion hole 7-3. A flexible substrate / stopper 7-9 is formed.

Next, an example of an assembling process of the small motor according to the present invention will be described. First, the shaft receiving plate 5, the bearing 15, and the brush device 14, which serve as the thrust receiving of the motor shaft 16, are assembled in the case lid 1. At this time, the brush base 14b is in a state of protruding from the brush holding hole 1-2 provided at the position of the terminal mounting groove 1-1 to the outside as shown in FIG.

Under this condition, the terminal press-fitting portion 2-1 of the terminal 2 is pressed into the protruding brush base 14b into the brush holding hole 1-2, and the other portion of the terminal 2 is connected to the terminal. Mount along the mounting groove 1-1.

The brush base 14b protruding from the brush holding hole 1-2 to the outside is placed between the guide pieces 2-4 and 2-5 of the terminal 2 as shown in FIGS. Bend to side 2 and terminal 2 to case lid 1
The brush base 14b and the terminal 2 are electrically connected to each other. Therefore, the number of contact points between the two has increased, and the electrical connection has been strengthened.

At this time, the terminal engaging portion 2-2 is arranged in the protrusion engaging portion 1-5 and is in a free state as shown in FIG. 5, and when the cover 7 shown in FIG. 3 is fitted. compared to,
The bending angle is kept almost horizontal.
Further, the two holding portions 2-3 for connecting and holding the terminals of the chip capacitor 8 are the storage portions 1-7 provided in the case lid 1.
It is located in.

Next, the case cover 1 is press-fitted into the open end of the motor case 20, but before that, the type in which the chip capacitor 8 is connected to the small motor is installed in the storage section 1-7. As shown in FIGS. 5 and 10, the chip capacitor 8 is press-fitted into the sandwiching portion 2-3 provided.

The cover 7 shown in FIGS. 7 to 9
Is covered on the case lid as shown in FIG. That is, the cover 7
When the protrusions 7-1 and 7-2 provided on the wall are pushed in along the respective wall surfaces E and F of the protrusion locking portions 1-5 and 1-6 of the case lid 1, the protrusions are as described above. The projecting portions 7-1 and 7 are provided by the groove portions 7-5 provided in 7-1 and 7-2.
-2 tip of each bends, and the projection locking part easily 1-
The protrusions 7-1 and 7-2 are inserted into 5 and 1-6, respectively. When the protrusions 7-1 and 7-2 are inserted to a predetermined position, the tip ends of the protrusions 7-1 and 7-2 that have been bent are returned to the original widths D1 and D2, and The stopper 7-4 works to prevent the cover 7 from being fitted and fixed to the case lid 1 side.

At this time, the cover pieces 7-6 and 7-7 are guided between the guide pieces 2-4 and 2-5 and in the terminal mounting groove 1-1 as shown in FIGS. As shown in FIG. 3, the projection 7-1, which covers all the lead portions of the terminal 2 and has the flexible board insertion hole 7-3, forcibly forces the tip of the terminal engaging portion 2-2. It acts like bending, and as a result, the terminal engaging portion 2-2
Is elastically engaged with the projection 7-1, and the fixing groove 7-8 provided on the projection 7-2 side presses and fixes the chip capacitor 8.

FIG. 4 shows a state in which the flexible board 4 is mounted. That is, under the state where the cover 7 is fitted to the case lid 1, the flexible board insertion hole 7-3
The flexible substrate 4 is inserted into. The flexible board 4 is inserted along the protrusion 7-1 so as to push down the terminal engaging portion 2-2 until the tip abuts the flexible board / stopper 7-9. Therefore, the terminal engaging portion 2-2 is more strongly and elastically engaged with the flexible substrate 4, so that the electrical connection with the terminal engaging portion 2-2 is ensured and the flexibility is increased. The substrate 4 is always inserted with a certain length,
Moreover, it will not fall out easily after it is inserted.

In the embodiment of the present invention described above with reference to FIGS. 1 to 12, the protrusion 7- of the cover 7 is used.
1 is provided with a flexible board / stopper 7-9 for locking the tip of the flexible board 4, but instead of the method using the flexible board / stopper 7-9, the shape shown in FIG. Flexible board 4
Can be used. In this case, a step portion 4-3 that comes into contact with the surface of the cover 7 is provided, and the step portion 4-3 is provided.
3 contacts the peripheral surface of the flexible substrate insertion hole 3-3. Therefore, the flexible substrate / stopper 7-9 is not necessary for the protrusion 7-1. In FIG. 13, reference numeral 4-1 represents a power supply terminal portion and 4-2 represents an insulating portion.

[0036]

As described above, according to the present invention, even when the whole terminal and the capacitor are connected, the main body of the capacitor and its terminal are all covered with the cover.
In addition, since the terminal engaging portion that comes into contact with the power supply terminal is also inside the motor, there is no need to expose the conductor through which electricity flows to the outside of the small motor, and it is possible to use the arrangement in which it directly comes into contact with other camera components. Become.

Since the brush base is bent toward the terminal side, the number of electrical contacts increases, the electrical connection is strengthened, and the terminal can be attached to the case lid without soldering. , Assembly work is improved.

[0038] Then, it is possible to reliably supply power to the flexible board or the like, which is an insertion type power supply terminal, without soldering.

[Brief description of drawings]

FIG. 1 is a side view of an example of a case lid side of a small motor to which the present invention is applied.

FIG. 2 is a sectional view taken along the arrow X in FIG.

FIG. 3 is a sectional view taken along the arrow Y in FIG.

FIG. 4 is a cross-sectional view for explaining insertion of a flexible substrate.

FIG. 5 is an assembly diagram of a case lid portion with a cover removed.

FIG. 6 is a front view of a case lid.

FIG. 7 is a plan view of the cover.

FIG. 8 is a vertical sectional view of a cover.

FIG. 9 is a left side view of the cover.

FIG. 10 is an explanatory diagram of sandwiching a chip capacitor.

FIG. 11 is a plan view of the terminal.

FIG. 12 is a front view of the terminal.

FIG. 13 is a partial front view of an embodiment of a flexible substrate applied to the present invention.

FIG. 14 is a vertical cross-sectional view illustrating the structure of a conventional small motor.

FIG. 15 is a side view of a conventional small motor on a case lid side.

16 is a cross-sectional view taken along the arrow A in FIG.

17 is a cross-sectional view taken along the arrow B in FIG.

18 is a perspective view of the terminal pressing member used in FIG. 15. FIG.

FIG. 19 is a cross-sectional view illustrating insertion of a conventional flexible substrate.

[Explanation of symbols]

 1 Case lid 1-1 Terminal mounting groove 1-2 Brush holding hole 1-5, 1-6 Protrusion locking part 1-7 Storage part 2 Terminal 2-1 Terminal press-fitting part 2-2 Terminal engaging part 2-3 Clamping Part 4 Flexible substrate 7 Cover 7-1, 7-2 Projection 7-3 Flexible substrate insertion hole 7-4 Stopper stopper 7-5 Groove 7-6, 7-7 Cover piece 7-8 Fixing groove 7-9 Flexible board / stopper 8 chip capacitors

Claims (3)

[Scope of utility model registration request] 1. A case cover made of synthetic resin, comprising a stator having a permanent magnet for forming a magnetic field on an inner peripheral surface of a motor case, and a rotor having a rotor winding wound around a rotor core. The brush device is configured to supply a current to the rotor winding through a commutator that is in sliding contact with a brush device for power supply supported by the brush device, and the brush device is supported by penetrating a case lid.・ Base and the brush
In a terminal device for a small motor, which comprises a brush arm extending from the base and in contact with the commutator and having a terminal connected to the brush base, a cover made of a synthetic resin material for covering the lead portion of the terminal is provided. The cover is provided with two protrusions fitted to the case lid and a terminal insertion hole into which an insertion-type power supply terminal is inserted, and the case lid includes the protrusion of the cover. Each of the terminals is provided with a protrusion locking portion for locking and a terminal mounting groove for guiding the lead portion of the terminal, and the terminal is a terminal engaging portion disposed on one of the protrusion locking portions provided on the case lid. And a terminal press-fitting portion that is electrically connected to the brush base. The terminal mounting groove is provided with the terminal press-fitting portion. The terminal engaging portion is elastically engaged with one of the projecting portions when the cover is fitted to the case lid after disposing the minal. A terminal device for a small motor, wherein the terminal device is inserted through a hole along the protrusion and elastically engages with the terminal at an engaging position of the terminal with respect to the protrusion. 2. The terminal is provided with two guide pieces formed at intervals wider than the width of the brush base, and a portion of the brush base penetrating from a case cover is fitted between the two guide pieces. The terminal device for a small motor according to claim 1, wherein the terminal device is bent in a folded shape, the terminal is fixed to the case lid, and electrical connection is made. 3. The terminal according to claim 1, wherein the terminal is formed with a holding portion for holding the capacitor, and the case lid is provided with a storing portion for housing the capacitor. Terminal device for small motors.