JP2000209818A - Brush-holding structure in motor and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brush-holding structure with which respective components of a motor can be incorporated easily. SOLUTION: A pair of flat spring boards 12 are attached and fixed to a cover 3 with commutators 10 sandwiched in between. A base 13 a of a flat spring type member 13 which is different from the flat spring board 12 is attached to each flat spring board 12 to press a brush 14 against the commutator 10. The position of the base 13a of the flat spring type member 13 is restricted by the holding tab 12e, protruding retainer 12g, protrusion 12h, etc., of the flat spring board 12, and the base 13a will not falls off due to vibration which is produced, when a motor 1 is driven. Since female terminal parts 12b are provided between the commutators 10 and the flat parts 12d of the flat spring board 12, the size of the motor 1 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a brush holding structure for a motor and a motor.

[0002]

2. Description of the Related Art A brush holding structure of a generally used motor is disclosed in, for example, Japanese Utility Model Application Laid-Open Nos. 61-43768, 4-111263, and 6-523.
No. 70, for example. In these cases, a pair of leaf spring-like members (brush arms) are provided with the commutator interposed therebetween, and a brush is attached to the tip of the leaf spring-like member. The brush is pressed by the commutator by the urging force of the spring. ing. The leaf spring-like member is housed in a lid (case lid), and the base end of the leaf spring-like member is attached and fixed to a predetermined position in the lid.

A small motor disclosed in Japanese Utility Model Unexamined Publication No. 6-52370 discloses a motor in which an internal terminal engaged with a power supply terminal (external terminal) is housed and fixed in a lid. In this case, the internal terminal is bent in a substantially arcuate shape, and is mounted in the case lid in an elastically deformed state.
The leaf spring-like member is formed in a substantially U-shape, and is in contact with the internal terminal via a projection on the inside.

[0004]

However, when assembling the components of the motors disclosed in the above publications, the urging force is applied to the leaf spring-like member, so that both the brushes are spread by hand. The body and the armature were to be assembled.
Therefore, there is a problem that the assembling work is troublesome. Furthermore, the structure near the brush is a leaf spring-like member,
The complexity of the motor due to internal terminals, protrusions, etc. hindered further downsizing of the motor.

The present invention has been made in view of the above problems, and a first object of the present invention is to provide a brush holding structure and a motor which can be easily assembled when assembling each component of the motor. To provide. A second object is to achieve the first object and make the motor compact.

[0006]

According to the first aspect of the present invention, there is provided a leaf spring-like member for elastically biasing and supporting a brush so as to contact a commutator.
A leaf spring substrate fixed to the lid and having a power receiving terminal portion for transmitting electric power to the brush, and a support portion for supporting a base portion of the leaf spring-like member; and the base portion of the leaf spring-like member. And locking means for locking the supporting member to the supporting portion of the leaf spring-shaped substrate.

According to a second aspect of the present invention, in order to achieve the second object, in the first aspect of the present invention, the power receiving terminal portion is provided on a commutator side with respect to a supporting portion of the leaf spring substrate. The gist is that it is a provided female terminal.

According to a third aspect of the present invention, in the first or second aspect of the invention, the lid has a holding portion for supporting the two leaf spring substrates in an electrically insulated state. The gist is that the holding portion holds a bearing for an output shaft.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the cover has a two-pole field housed inside the motor. The gist of the present invention is that a drop-off preventing portion for holding at least one of the magnets is provided.

According to a fifth aspect of the present invention, a gist of the present invention is that the motor includes the brush holding structure according to any one of the first to fourth aspects. (Function) According to the first aspect of the present invention, the leaf spring substrate is attached and fixed to the lid, and the base of the leaf spring-like member is attached to the supporting portion of the leaf spring substrate by the locking means. Therefore, the leaf spring-like member can be assembled after the armature and the lid are attached, so that the assembly is simplified.

According to the invention described in claim 2, according to claim 1,
In addition to the operation of the invention described in (1), since the female terminal portion is located in a region between the commutator and the supporting portion of the leaf spring substrate, the structure around the brush can be made compact and simple.

According to the third aspect of the present invention, the first aspect is provided.
Alternatively, in addition to the effect of the invention described in claim 2, the holding portion is
While supporting the two leaf spring substrates in an electrically insulated state,
Since the bearing of the output shaft is held, one part performs a plurality of functions, and the number of parts can be reduced.

[0013] According to the invention described in claim 4, according to claim 1 of the present invention.
In addition to the effect of the invention described in any one of the third to third aspects, the field magnet housed inside the motor is held at a predetermined position by the falling-off preventing portion provided on the lid.

According to the fifth aspect of the present invention, the motor has the brush holding structure according to any one of the first to fifth aspects. The same operation as the operation described in any one of them is obtained.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention embodied in a motor will be described below with reference to FIGS.

As shown in FIG. 6, the motor 1 according to the present embodiment includes a yoke 2 and a lid 3. York 2
Is formed in a cylindrical shape with a bottom, and a lid 3 is attached to the opening side. The armature 4 is housed inside the yoke 2. The output shaft 5 extends on the axis of the armature 4, and has one end in contact with the lid 3 and the other end formed in the bottom of the yoke 2.
a. The two-pole field magnets 6 are arranged to face each other with the armature 4 interposed therebetween.

The two field magnets 6, as shown in FIG.
It is formed in an arc-shaped cross section and has a predetermined clearance with the armature 4. The yoke 2 has a flat cross section in which a portion where the field magnet 6 is not arranged is cut flat, and has two opposing flat portions 2b and two opposing arc portions 2c. . The field magnet 6 is mounted in the yoke 2 in a state of being in close contact with the inner peripheral surface of the arc portion 2c by a not-shown locking portion. However, the yoke 2 is movable in the axial direction.

As shown in FIGS. 5 and 6, the lid 3 is made up of a metal lid substrate 7 and a resin insulating portion 8 as a holding portion integrally formed on the lid substrate 7. Consists of
As shown in FIG. 6, the insulating portion 8 includes a connector portion 8a on the outside (left side in FIG. 6) and a fixing projection 8b on the inside (right side in FIG. 6). Power supply terminal T
Are connected to an external power supply (not shown) and are inserted into holes 8c formed in the connector section 8a. As shown in FIGS. 5 and 6, the bearing 9 is attached to the insulating portion 8 and rotatably supports the output shaft 5 on the lid 3 side.

The commutator 10 is attached to a portion of the output shaft 5 on the lid side. The brush support 11 is provided in a pair with the commutator 10 interposed therebetween.
3 is provided. The leaf spring substrate 12 has the fixing projection 8b fitted in the hole 12a and is mounted on the insulating portion 8 of the lid 3, and supports the leaf spring-like member 13. The brush 14 is attached to the tip of the leaf spring-like member 13 and comes into contact with the commutator 10 by the urging force of the leaf spring-like member 13. Further, since the leaf spring-shaped member 13 is formed with a predetermined length in order to secure a sufficient urging force, a predetermined distance is provided between the leaf spring substrate 12 and the commutator 10 as shown in FIG. (Space) is formed.

The leaf spring substrate 12 has a female terminal portion 12b as a power receiving terminal portion, and the female terminal portion 12b is attached to the insulating portion 8 in a direction in which the female terminal portion 12b is located on the commutator 10 side. That is, the female terminal portion 12 b is located between the commutator 10 and the leaf spring substrate 12. When the power supply terminal T is inserted into the hole 8c and connected to the female terminal portion 12b, a current from an external power supply (not shown) is supplied to the armature 4 via the brush support 11, the brush 14, and the commutator 10.
, And flows through a winding (not shown).

As shown in FIG. 5, at the four corners of the insulating portion 8,
A columnar support 15 is formed to extend in the axial direction of the output shaft 5. The support portion 15 is located inside the leaf spring substrate 12 attached to the fixing projection 8b, and supports one leaf spring substrate 12 from the inside thereof. Further, at the end of the insulating portion 8, a rod-shaped positioning portion 16 as a falling-off prevention portion is formed so as to be extended one by one on the outside of the brush support 11. The positioning part 16 is configured to move the field magnet 6 housed in the yoke 2 to the armature 4.
And the leaf spring substrate 12 is positioned from the outside.

As shown in FIG. 3, the leaf spring-like member 13
It is manufactured by bending one metal plate and forming the base portion 13a.
And an elastic displacement portion 13b which is bent at substantially 90 degrees with respect to the base portion 13a and extends. Base 13
a is provided with a square engaging hole 13c at the tip thereof. Further, a brush 14 is provided at an end of the elastic displacement portion 13b.
Is attached.

As shown in FIG. 2, the leaf spring substrate 12
A metal terminal is formed by bending a sheet of metal, and both sides of a base 12c are provided with a female terminal 12b that is bent substantially at a right angle and stands upright in an adjacent state, and a flat plate 12d as a support. The hole 12a to be fitted with the fixing projection 8 has a base 12c.
Is formed.

In the flat plate portion 12d, a holding piece 12e is formed to be bent at the upper center in FIG. 2, and the holding piece 12e is urged in a direction in which a tip portion thereof enters a central cutout portion 12f of the flat plate portion 12d. I have. On the flat plate portion 12d, a protruding locking portion 12g and two convex portions 12h are formed on one side (left side in FIG. 2) with respect to the holding piece 12e. The protruding locking portion 12g has an inclined surface that becomes lower toward the holding piece 12e. The protruding portion 12h has a columnar shape and is formed vertically above and below the protruding locking portion 12g. Also, the flat plate portion 1
2d, a cut-and-raised portion 12i is formed to be bent up and down at an end opposite to the convex portion 12h with the holding piece 12e interposed therebetween, and a plate-like cut-and-raised portion 12j is formed between the cut-and-raised portions 12i. It is formed to be bent toward the portion 12b.

As shown in FIG. 1, the leaf spring substrate 12 and the leaf spring-like member 13
The plate spring substrate 12 is assembled so as to be sandwiched between the flat plate portion 12d and the holding piece 12e. In this assembled state, the base portion 13a of the leaf spring-shaped member 13 has a flat portion 12d in which the engagement hole 13c is fitted into the protruding locking portion 12g, and the cutout surface 13d is engaged with the upper and lower convex portions 12h. Is positioned with respect to In other words, the position of the leaf spring-like member 13 is regulated in the X-axis direction with respect to the leaf spring substrate 12 by fitting the protruding locking portion 12g into the engagement hole 13c. The position of the base 13a is regulated in the Y-axis direction by being sandwiched between the flat plate portion 12d and the holding piece 12e. The protruding locking portion 12g and the engagement hole 13c are fitted, and the cutout surface 13d at the end of the base 13a is
h, and the base 13a is
The position is regulated in the Z-axis direction by being supported between i. The locking means includes a holding piece 12e, a protruding locking portion 12g, a convex portion 12h, a cut-and-raised portion 12i, and the like.

Next, the operation of the motor configured as described above will be described. In advance, two leaf spring substrates 12 are fixed to the lid 3 on the fixing projections 8b. Then, the output shaft 5 located on the commutator 10 side of the armature 4 is connected to the bearing 9 of the lid 3.
And the lid 3 and the armature 4 are assembled. Next, the two leaf spring-shaped members 13 are
It is attached to each of the two flat plate portions 12d. In this case, the base 13a of the leaf spring-like member 13 is
i, the base 13a is sandwiched between the flat plate portion 12d and the holding piece 12e of the leaf spring substrate 12, and the base 13 is inserted so that the distal end of the base 13a is inserted between the two protrusions 12h.
a is slid along the rear surface (outer surface) of the flat plate portion 12d. Then, as shown in FIG. 1, the leaf spring-like member 13 is fitted with the protruding locking portion 12g into the engaging hole 13c of the base 13a, and the end of the base 13a (FIG. 1).
The left notch surface 13d is engaged with the two convex portions 12h. At this time, the elastic displacement portion 13b of the leaf spring-like member 13
The brush 14 fixed to the tip of the brush is gradually approached and abuts the outer peripheral surface of the commutator 10, and is pressed against the commutator 10 by the elastic deformation of the elastic displacement portion 13b.

After the leaf spring-like member 13 is attached, the yoke 2 and the lid 3 are attached so that the armature 4 is accommodated in the yoke 2. In this case, the field magnet 6 is
When the yoke 2 and the cover 3 are assembled, the positioning portion 16 positions the motor 1 at a predetermined position in the axial direction of the motor 1 when the yoke 2 and the lid 3 are assembled. Thus, the field magnet 6 is arranged at a predetermined position in the yoke 2 facing the armature 4.

For example, even if the brush 14 is worn and the urging force of the leaf spring-like member 13 is applied, the commutator 10 and the brush 14
When the contact with the plate spring is not sufficient,
Can be replaced. In this case, first, the yoke 2 and the lid 3
And remove. Then, of the brush support 11 integrated with the lid 3, the leaf spring-shaped member 13 is
Remove from 2 Then, the brush 14 is replaced by attaching a new leaf spring-like member 13 and attaching the yoke 2 and the lid 3 again.

Therefore, in this embodiment, the following effects can be obtained. (1) After assembling the lid 3 and the armature 4, the leaf spring-like member 13 can be attached to the leaf spring substrate 12, so that the armature 4 is attached after the leaf spring-like member 13 is attached to the lid 3. The cover 3 and the armature 4 can be easily assembled as compared with a conventional assembling method of attaching the armature 4 to the cover 3. That is, conventionally, it was necessary to spread the leaf spring-like member by hand, but such trouble is eliminated. Further, when the brush 14 is worn and the leaf spring-like member 13 is replaced, it is not necessary to remove the lid 3 and the armature 4, and the replacement is easy.

(2) Holding piece 12 constituting locking means
e, protruding locking portion 12g, convex portion 12h, cut and raised portion 12
Since i, the base 13a, the engagement hole 13c, and the like are formed integrally with the leaf spring substrate 12 and the leaf spring-like member 13, the number of components of the brush support 11 is two, and the leaf spring-like member 13 The work of assembling to the leaf spring substrate 12 is easy.

(3) The leaf spring-like member 13 can be locked by inserting the brush 14 into the leaf spring substrate 12 in such a manner as to slide the brush 14 toward the outer peripheral surface of the commutator 10. That is, the direction in which the urging force of the leaf spring-like member 13 acts and the direction in which the leaf spring-like member 13 is assembled to the leaf spring substrate 12 are the same direction.
There is no need to worry about excessive force being applied, and the assembly is easy.

(4) Since the female terminals 12b are arranged using the space (region) between the leaf spring substrate 12 and the commutator 10, the motor 1 can be made compact. Also,
Since the female terminal portion 12b is formed integrally with the leaf spring substrate 12, the number of components is reduced as compared with the conventional case, so that the structure around the brush 14 can be simplified.

(5) Since the insulating portion 8 supporting the two leaf spring substrates 12 holds the bearing 9 of the output shaft 5,
One part can play a plurality of roles, and the number of parts can be reduced.

(6) Since the positioning portion 16 is provided on the lid 3, the field magnet 6 housed in the yoke 2 can be held at a predetermined position facing the armature 4. Note that the embodiment is not limited to the above, and for example, may be changed as follows.

The locking means is not limited to the embodiment. That is, any structure may be used as long as the leaf spring-like member 13 is attached to the leaf spring substrate 12 after the lid 3 and the armature 4 are attached. For example, the leaf spring-shaped member 13 may be assembled to the leaf spring substrate 12 with a separate locking pin or the like. Further, a holding piece 12e is provided at the base 13a of the leaf spring-shaped member 13,
The flat plate portion 12d may be sandwiched between the holding piece 12e and the base portion 13a.

The locking means may be a holding means. In this case, the holding means is constituted by a holding piece 12e, which holds the flat plate portion 12d of the leaf spring substrate 12 tight, and the leaf spring-like member 13 is supported only by the holding piece 12e. By doing so, the labor for providing other locking means can be omitted.

Only one side of the two brush supports 11 may be disassembled into a leaf spring substrate 12 and a leaf spring-like member 13. Even if the brush support 11 that can be disassembled is only on one side, assembly of the parts becomes easy.

The power receiving terminal is not limited to being located inside (commutator side). For example, the arrangement of the flat plate portion 12d and the female terminal portion 12b may be reversed, and the locking means may be arranged on the inner surface (commutator side surface) of the flat plate portion 12d.

The power receiving terminal is not limited to the female terminal 12b. For example, a male terminal may be used. -The number of the positioning parts 16 can be changed suitably. In the present embodiment, the positioning portion 16 is located at one position with respect to one field magnet 6.
However, the number may be two or more. By doing so, the field magnet 6 can be held more reliably.

The shape of the motor to which the brush holding structure is applied can be changed as appropriate. That is, the motor is not limited to a flat cross section, but may have a circular cross section. The technical ideas other than the claims that can be grasped from the embodiment and other examples will be described below together with their effects.

(1) In the invention according to any one of claims 1 to 5, the locking means is formed on at least one of the leaf spring substrate and the leaf spring-like member. . In this case, assembling becomes easier, for example, as compared with a case where the leaf spring substrate and the leaf spring-like member are assembled with a separate locking pin or the like.

(2) In the invention as set forth in any one of claims 1 to 5, the locking means includes: a direction in which the leaf spring-like member is assembled to the leaf spring substrate; It has a structure in which the direction in which the urging force of the member works is the same. In this case, since the trouble of expanding the leaf spring-like member can be omitted, the assembling of the leaf spring substrate and the leaf spring-like member can be simplified.

(3) In the invention described in any one of the first to fifth aspects, the base of the leaf spring-shaped member is opposite to the commutator side in the supporting portion of the leaf spring substrate. It is assembled on the surface. In this case, as compared with the case where the base is assembled to the commutator side surface of the supporting portion, the assembling work is easier and the length of the leaf spring-like member can be increased, so that the brush is pressed against the commutator. Energizing force enough to do so can be secured.

(4) In the invention according to any one of the first to fifth aspects, the leaf spring-like member is regulated in a three-dimensional direction with respect to the leaf spring substrate by the locking means. Have been. In this case, the leaf spring substrate and the leaf spring-like member can be hardly separated.

(5) In the invention according to any one of the first to fifth aspects, the locking means includes a holding means. In this case, the leaf spring substrate and the leaf spring-like member can be assembled with a simple structure, and if the holding means is strong, the leaf spring-like member can be supported simply by sandwiching the leaf spring-like member. Can be fixed tightly to the substrate. The holding means is constituted by a holding piece 12e.

(6) In the invention according to any one of claims 1 to 5, the power receiving terminal is attached to an end face of the motor. In this case, the power supply terminal can be connected to the power receiving terminal even from the axial direction of the motor.

(7) In the invention according to claim 4 or 5, the leaf spring substrate is fixed to the fixing projection formed on the holding portion. In this case, the leaf spring substrate can be easily attached.

[0048]

As described in detail above, according to the first and fifth aspects of the present invention, the leaf spring substrate and the leaf spring-like member are separated from each other and can be assembled by the locking means. . Therefore, after assembling the lid and the armature, the leaf spring-like member can be attached to the leaf spring substrate previously attached and fixed to the lid, so that the work of assembling the parts can be facilitated.

According to the second and fifth aspects of the present invention, in addition to the effect of the first aspect, the female terminal is disposed between the commutator and the leaf spring substrate. The brush holding structure and the motor can be made compact. Further, since the female terminal is formed integrally with the leaf spring substrate, the number of parts is reduced, and the structure around the brush is simplified.

According to the third and fifth aspects of the present invention, in addition to the effect of the third aspect of the present invention, since the bearing is held by the holding portion, one part fulfills a plurality of functions. And the number of parts can be reduced.

According to the fourth and fifth aspects of the present invention, in addition to the effect of the third aspect of the present invention, the field magnet inside the motor can be positioned by the falling-off preventing portion.

[Brief description of the drawings]

FIG. 1 is a perspective view of a brush support according to an embodiment.

FIG. 2 is a perspective view of a leaf spring substrate.

FIG. 3 is a perspective view of a leaf spring-shaped member.

FIG. 4 is a sectional view taken along line II-II in FIG. 6;

FIG. 5 is a perspective view of a brush holder housing.

FIG. 6 is a side sectional view of a motor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motor, 3 ... Lid, 6 ... Field magnet, 7 ... Substrate, 8 ...
Insulating part as holding part, 9 ... bearing, 10 ... commutator, 12
... leaf spring substrate, 12b ... female terminal as power receiving terminal, 1
2d: a flat plate portion as a support portion; 12e, a holding piece as a locking means and holding means; 12g, a protruding locking portion as a locking means; 12h, a convex portion as a locking means; Cut-and-raised portion as locking means, 13: leaf spring-like member, 13a: base portion, 14: brush, 16: positioning portion as a drop-off preventing portion.

Claims (5)

[Claims] A leaf spring-like member (1) for elastically biasing and supporting a brush (14) so as to contact a commutator (10).
3), a power receiving terminal portion (12b) attached to and fixed to the lid (3) for transmitting power to the brush (14), and a base (13a) of the leaf spring-like member (13). A leaf spring substrate (12) having a supporting portion (12d), and the base (13a) of the leaf spring-like member (13) is locked to a supporting portion (12d) of the leaf spring-like substrate (12). A brush holding structure in the motor (1), comprising a locking means (12e, 12g, 12h, 12i). 2. The power receiving terminal part (12b) is a female terminal (12b) provided on a commutator (10) side with respect to the support part (12d) of the leaf spring substrate (12). The brush holding structure in the motor (1) according to claim 1, characterized in that: 3. A holding portion (8) for supporting the two leaf spring substrates (12) in an electrically insulated state on the lid (3).
The brush holding structure in the motor (1) according to claim 1 or 2, wherein the holding portion (8) holds a bearing (9) for an output shaft (5). . 4. The motor (1) is provided on the lid (3).
4. A drop-off preventing portion (16) for holding at least one of a two-pole field magnet (6) accommodated in the inside of the housing (1). The brush holding structure in the motor (1) according to (1). 5. A motor comprising the brush holding structure according to claim 1. Description: