JP3004182B2 - Motor bearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor bearing device, and more particularly to a motor bearing device suitable for a multi-pole flat motor.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view of a conventional motor, and FIG. 5 is a sectional view of a main part of a bearing device showing another conventional example. The technique shown in FIG. The portion 41a has a cylindrical shape with a convex shape outward, and the bearing portion 41a protrudes greatly inside the motor, and there is a disadvantage that the winding space is reduced. For this reason, there is a limit in increasing the torque with a motor of the same size. That is, the bearing is arranged inside the coil end, and the bearing is held so that the yoke housing is once squeezed toward the core and the bearing housing is secured in the opposite direction.

For this reason, in order to prevent interference with the narrowed yoke housing portion, the coil cannot be packed to the inside, and the core shape needs to have a large slot bottom diameter D as shown in FIG. Due to these problems, a large storage space for the armature coil cannot be obtained, and as a result, a high output cannot be obtained, or the motor must be increased in size in order to obtain a high output. was there.

In FIG. 4, reference numeral 42 denotes a ball bearing as a bearing, reference numeral 43 denotes a washer, and reference numeral 41b denotes a yoke caulking. In the bearing device, the ball bearing 42 is mounted on the bearing portion 41a, and then the washer 43 is mounted. The ball bearing 42 is fixed by a yoke caulking 41b through the intermediary of the ball bearing 42.

Further, in the technique shown in FIG. 5, in order to effectively utilize the central portion of the motor, a shape for once narrowing the yoke housing toward the core and further securing the bearing housing portion in the opposite direction as shown in FIG. 4 is not employed. A rivet 54 is used for fixing the bearing plate 53 and the yoke housing 51, and an O-ring 55 is provided between the plate 53 and the yoke housing 51.
This prevents water transmitted from the outer surface of the yoke housing 51 from entering the inner surface of the yoke housing 51 and the bearing insertion portion. At this time, the yoke housing 51 and the plate 53 are separately painted and then caulked with rivets 54 to be integrated.

However, this technique requires a plate 53 and a rivet 54 for fixing the bearing in order to insert the bearing from the outside of the yoke housing 51, and further requires an O-ring 55 for waterproofing. There are many disadvantages such as an increase in the number of steps in motor manufacturing and an increase in cost.

There is also known a motor waterproofing technique in which a bearing presser plate of a bearing press-fitted between a stator and a rotor shaft is provided, and a water shield plate for covering the bearing presser plate is provided on the outside (for example, Japanese Utility Model Application Laid-Open Publication No. HEI 9-26139). 58-
No. 49562). However, in this technique, similarly to the conventional example shown in FIG. 5, the bearing presser plate for fixing the bearing and the fixing means of the bearing presser plate, the water shield plate for waterproofing, and the fixing means of the water shield plate are provided. This is necessary, and there is a disadvantage that the number of parts is large and the cost increases as the number of steps in the motor manufacturing increases.

As described above, with the configuration as shown in FIG. 4, in order to increase the output of the motor, it is necessary to employ means such as enlarging the size of the motor and improving the performance of parts. However, all of them have disadvantages that lead to an increase in weight and cost, and thus cannot meet the demand for a reduction in weight and size. In addition, if the configuration shown in FIG. 5 is used, the number of parts increases due to the fixing and waterproofing of the bearing, and the number of steps increases, and it is not possible to manufacture at low cost.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned disadvantages. In addition to being compact and capable of high output, rivets and plates for fixing bearings are eliminated, and seals are provided for waterproofing. The motor can be constructed without using parts such as plates and O-rings, reducing the number of parts and the number of steps, thereby increasing the efficiency of motor production and reducing motor cost. It is an object of the present invention to provide a bearing device, that is, a motor bearing device capable of providing a small-sized and high-output motor while reducing the number of parts to achieve waterproofing.

Another object of the present invention is to provide a bearing device for a motor in which the space in the armature core slot can be made larger than before, thereby achieving high motor output in a motor of the same size, and reducing the size and weight of the motor. Another object of the present invention is to provide a bearing device for a motor that can be realized.

[0011]

According to a first aspect of the present invention, there is provided a motor bearing device in which a plate disposing recess formed from the outside to the inside of the motor and opening into the motor continuously from the plate disposing recess. A yoke housing having a bearing arrangement portion provided with a bearing support portion formed by bending an open end of the yoke housing; a plate arranged in a plate arrangement recess of the yoke housing and fixed integrally with the yoke housing; And a bearing mounted from inside the motor, wherein the bearing is held by the plate and the bearing support. At this time, it is preferable that the plate and the yoke housing are coated together.

[0012]

According to the first aspect of the present invention, from the outside of the motor ,
A yoke housing including a plate disposing recess formed in the inner side direction and a bearing disposing portion provided with a bearing supporting portion which is opened to the inside of the motor continuously to the plate disposing recess and which is formed by bending an open end; A motor bearing device comprising: a plate arranged in a plate arrangement recess of a yoke housing and fixed integrally with the yoke housing; and a bearing mounted on the bearing arrangement portion from the inside of the motor, wherein the bearing comprises the plate Since the bearing is held by the bearing support portion, the bearing is fixed by the bearing support portion inside the motor, so that plates and rivets for fixing the bearing can be eliminated, and the bearing can be mounted from inside the motor. As a result, the O-ring and seal plate for waterproofing can be eliminated, and since the bearing support section only bends the open end, the protection is prevented. And by reducing the number of parts and steps for bearing the fixed, it can be made compact at low cost.

[0013] Further, the yoke housing space for arranging the bearings can be reduced as compared with the related art, so that the diameter of the slot bottom can be reduced, and the space for arranging the winding wound around the slot can be sufficiently secured. As described above, since the bearing arrangement space can be reduced, the bearing can be located in the coil end, and the overall length of the motor can be shortened, whereby the armature core slot, that is, the armature coil storage space can be increased. . This allows the armature coil to be packed down to the inside,
Armature core shape can reduce the slot bottom diameter, can be to rather large the armature coil receiving space, shortening the overall length of the motor.

At this time, the waterproof effect can be enhanced by painting, the number of parts can be reduced, the assembling process can be facilitated, and the production efficiency can be increased.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. The members, arrangement, and the like described below do not limit the present invention, and can be variously modified within the scope of the present invention.

FIG . 1 is a sectional view of a motor showing a first embodiment of the bearing device according to the present invention. The motor M of the present embodiment includes a stator 2 composed of a motor magnet disposed on an inner peripheral wall of a yoke housing 1, and a winding 5 fixed to a rotating shaft 3.
And a commutator 7 fixed to the rotating shaft 3.
End frame 1 supported by yoke housing 1
3 and a brush holder 8
And a brush 9 housed therein.

A bearing device S is provided on one side of the yoke housing (the left side in FIG. 1, which is the output shaft side in this example). The bearing device S of the present embodiment has a
a, the bearing arrangement part 10b, and the bearing support part 10c are main components. Plate arrangement recess 10a is the motor
The bearing arrangement portion 10b is formed from the outer side to the inner side , and is continuous with the plate arrangement concave portion 10a. The bearing arrangement portion 10b is opened inside the motor, and an opening end on the opening side is provided with a bearing support portion 10c.
Are formed. That is, the bearing arrangement portion 10b of the yoke housing 1 has a two-stage drawing shape that is convex inward. Further, the bearing support portion 10c of the present example is formed by forming a notch with a predetermined width and bending inward. A connection hole 10d for connecting to the plate 11 is formed in the plate arrangement recess 10a.

A plate 11 is arranged in the plate arrangement recess 10a of the yoke housing 1 and is fixed integrally with the yoke housing 1. The plate 11 of this example has a through hole 11a for the rotary shaft 3 formed in the center, a projection 11b formed at a predetermined position on the inner surface on the end side, and a connection formed in the plate arrangement recess 10a. It is configured to be able to fit into the hole 10d.

A bearing J is mounted on the bearing arrangement portion 10b, and the bearing J is held by a plate 11 and a bearing support portion 10c formed at an open end of the bearing arrangement portion 10b via a washer 12. It is configured to be. By press-fitting the plate 11 into the yoke housing 1, it is possible to prevent water transmitted from the outer surface of the yoke housing 1 from infiltrating into the inner surface of the yoke housing 1 and the bearing portion even if the conventional seal is abolished. Then, the plate 11 is press-fitted into the yoke housing 1 and the yoke housing 1 is caulked, so that fixing parts such as rivets can be eliminated.

The assembly of the bearing apparatus S is performed as follows. When the plate 11 is press-fitted or fitted into the plate arrangement recess 10a of the yoke housing 1, the connection hole 10d formed in the plate arrangement recess 10a and the projection 11b of the plate 11 are fitted. It is crushed and caulked to the yoke housing 1 to be integrated. In this example, powder coating is applied to prevent rust of these parts.

[0021] When powder coating, by heat, since the life of the bearing J itself is shortened, usually painted performed before assembly of the bearing J. At this time, the gap between the yoke housing 1 and the plate 11 is also painted so that the gap is filled and plays a role of waterproofing. Then, the bearing J is inserted from the inside of the motor, and then the washer 12 is inserted in order, and at the same time, the notch of the bearing support portion 10c is formed by a punch (not shown), and at the same time, the bearing support portion 10c is moved inward (that is, the rotating shaft 3 side). The bearing J and the washer 12 are fixed by bending and caulking.

[0022] With this configuration, the bearing J is would be provided from the motor inside, as well as means for waterproofing is alleviated, as compared with FIG. 5 showing the conventional example, waterproof The O-ring provided for this purpose is not required, and rust prevention and waterproofing can be performed more reliably by powder coating. Also, rivets are not required due to the projections 11b formed on the plate 11. As described above, the number of components can be reduced while ensuring waterproofness, and since the yoke housing 1 is not once narrowed inward, a space for arranging windings can be ensured, and miniaturization and high output can be achieved. be able to.

FIG. 2 is a sectional view of a main part of a bearing device according to a second embodiment. In this embodiment, the same components as those in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted. As shown in FIG. 2, one side of the yoke housing 1 (the left side in FIG. 2, which is the output shaft side in this example) is from the outside to the inside of the motor.
The plate disposing recess 10a formed in the direction is formed, and the bearing disposing portion 10b is continued to the plate disposing recess 10a.
Are formed. The bearing arrangement portion 10b is opened inside the motor, and a bearing support portion 10c is formed at the opening end.

[0024] That is, the bearing portion of the yoke housing 1 has a two-stage diaphragm shape becomes convex inwardly. A projection 1a for caulking the plate 21 is formed between the plate disposing recess 10a and the outer surface of the yoke housing 1. The plate arrangement recess 10a of this example is formed as a recess 10f having a slightly deeper outer periphery.
It is configured such that the back portion of the concave portion 21b of the plate 21 is disposed at f. The plate 21 of the present embodiment is formed with a concave portion 21b having a substantially U-shape on both ends, and is configured to be able to fit into the concave portion 10f formed in the plate arrangement concave portion 10a. Reference numeral 21a is a through hole for the rotating shaft.

A plate 21 is fitted and fixed in the plate arrangement recess 10a of the yoke housing 1.
It is arranged and fixed integrally with the yoke housing 1. A bearing J is mounted on the bearing arrangement portion 10b from the inside of the motor. The bearing J is connected to the plate 21 and a bearing support portion 10c formed at an opening end of the bearing arrangement portion 10b via a washer 12. It is configured to be held.

The assembly of the bearing apparatus S is performed as follows. When the plate 21 is press-fitted or fitted into the plate-arranged recess 10a of the yoke housing 1, the recess 10f of the plate-arranged recess 10a and the recess 21b of the plate 21 are fitted, and then the caulking formed on the yoke housing 1 is formed. The plate 21 is prevented from coming off by swaging the projection 1a. Then, in order to prevent rust of these parts, powder coating is performed. In the case of powder coating, heat shortens the service life, so coating is usually performed before assembling the bearing.

[0027] At this time, the yoke housing 1 and the plate 2
1 is also painted in the gap, and fills the gap and plays a role of waterproofing. Then, the bearing J and the washer 12 are sequentially inserted from the inside of the motor, and the bearing support 10 is inserted by a punch (not shown).
c at the same time as forming the cut,
The bearing J and the washer 12 are fixed by bending 0c inward (that is, the rotating shaft 3 side) and caulking. In order to paint after caulking, it is not necessary to increase the man-hour if painting is done after caulking. However, since the bearing is deteriorated, the yoke housing 1 and the plate 21 are assembled first, and the bearing J and the washer 12 are painted onto the yoke housing 21 after painting. The outer ring of the bearing J can be fixed by inserting and caulking the projection 1a.

FIG . 3 is a sectional view of a main part of a bearing device showing another embodiment. In the embodiment shown in FIG. 2 described above, an example is shown in which the bearing J is fixed by making a cut with a predetermined width so that it can be bent inward as the bearing support 10c. Is an example in which a support surface is formed so as to go around the inner peripheral side.

In this embodiment, when assembling the bearing J, the plate 21 and the yoke housing 1 are separately painted beforehand. Then, before assembling the plate 21, the bearing J is attached. That is, first, the bearing J is inserted into the support surface side of the yoke housing 1. Then, the plate 21 is pressed into the plate arrangement portion 10b of the yoke housing 1. Thereby, waterproofing can be performed, and furthermore, a part of the yoke housing 1 is shaved by a caulking punch to form a projection 1a, and the plate 21 is caulked, and the outer ring of the bearing J and the plate 21 are fixed. According to this embodiment, the same operation and effect as those of the second embodiment can be obtained, and it is not necessary to bend the bearing support 10c.

With the above construction, the bearing J is disposed from the inside of the motor, so that not only the means for waterproofing is eased but also the conventional example shown in FIG.
O-rings provided for waterproofing are not required in comparison with the above. The space for holding the bearing can be minimized, the armature coil can be packed down to the inside, and the armature core shape can reduce the slot bottom diameter D as shown in FIG. Space can be increased.

[0031] That is, armature core used in a bearing device according to the present invention, as compared with the conventional example of FIG. 8, FIG. 7
, The slot bottom diameter D can be reduced, so that the motor output = magnetic loading (= magnetic flux amount) ×
When many numerical values composed of electric loads (= the number of coils) are compared with the same physical size, the number of coils can be increased and increased, so that a motor with higher output can be obtained.

FIG . 6 is a sectional view of the motor . Note that
6, the same reference numerals are given to the same members and the like as in the above-described example, and the description is omitted.

[0033] On one side of the yoke housing 30 (left side in FIG. 6 is a output shaft side), a bearing arrangement portion 33 is formed. In the bearing arrangement part 33, the plate 31 is formed inside the yoke housing 30 (that is, inside the motor). Plate 31 has a donut-shaped disk portion 31a for connecting the yoke housing 30, the disk portion 31a
And a cylindrical tubular body 30b formed continuously inside.

The opening side of the cylindrical body 30b (the disc opposite)
A bearing support portion 10c is formed at the opening end portion. Bearing support portion 10c is formed is placed cut at a predetermined width so can be folded inwardly as in the embodiment. The disk portion of the plate 31 and the yoke housing 30 are integrally fixed. The bearing J is mounted from the inside of the motor to the bearing placement portion 33, the bearing J, via a washer 12, the yoke
The housing 30, the plate 31, and the bearing support 10 c formed at the open end of the cylindrical body 30 b are configured to be held.

The above-mentioned bearing device is assembled as follows. First, the yoke housing 30 and the plate 31 are integrally joined in advance. Joining is performed by welding, fitting, or other means that can be integrally joined. Next, the bearing J and the washer 12 are sequentially inserted from the inside of the motor, and at the same time, the notch of the bearing support portion 10c is formed by a punch (not shown), and at the same time, the bearing support portion 10c is bent inward (that is, the rotating shaft 3 side) and swaged. , Bearing J and washer 12 are fixed. It goes without saying that the coating can be applied as in the above embodiment.

[0036]

The present invention simultaneously solves the problem of providing a small-sized, high-output motor while at the same time reducing the number of parts and achieving waterproofness, which has been difficult in the past. According to the bearing device, the space for arranging the bearings is reduced, the space for arranging the windings is sufficiently ensured, and the number of parts for fixing and waterproofing is reduced by simultaneously mounting the bearings from the inside of the motor. In addition, since the bearing support portion merely bends the open end, the assembling process is easy, and it is possible to provide a compact and inexpensive motor with improved production efficiency.

[0037] Further, by the configuration in which the bearing device is disposed in the coil end of the rotor, the overall length of the motor can be shortened, and the armature core slot, that is, the armature coil storage space can be increased. The slot bottom diameter of the armature core can be reduced, and the armature coil storage space can be increased. For this reason, the overall length of the motor can be reduced, and the size and weight can be reduced. By inserting the bearing from the inside of the motor in this way, the waterproof effect can be enhanced, the number of parts can be reduced, the assembling process is easy, and the production efficiency can be increased.

[Brief description of the drawings]

FIG. 1 is a sectional view of a motor showing a first embodiment of a bearing device according to the present invention.

FIG. 2 is a sectional view of a main part of a bearing device according to a second embodiment.

FIG. 3 is a sectional view of a main part of a bearing device according to a third embodiment.

FIG. 4 is a sectional view of a motor showing a conventional example.

FIG. 5 is a sectional view of a main part of a bearing device showing a conventional example.

FIG. 6 is a sectional view related to a motor.

FIG. 7 is a plan view of an armature core used in the bearing device of the present invention.

FIG. 8 is a plan view of an armature core used in a conventional bearing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Yoke housing 1a Projection 2 Stator 3 Rotating shaft 5 Winding 6 Rotor 7 Commutator 8 Brush holder 9 Brush 10a Plate arrangement concave part 10b Bearing arrangement part 10c Bearing support part 10d Connection hole 11 plate 11b Projection 10f concave part 12 washer 21b concave part 21a insertion hole 21 plate 30 yoke housing 30b cylindrical body 31 plate 31a disk portion 33 bearing arrangement portion J bearing M motor S bearing device

Continuation of front page (56) References JP-A-60-55835 (JP, A) JP-A-61-77656 (JP, U) JP-A-51-1704 (JP, U) JP-A-50-7390 (JP) , Y1) (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 5/10-5/173

Claims (2)

(57) [Claims] 1. A motor according to claim 1, further comprising a plate recess formed from the outside to the inside of the motor and a bearing support formed by opening the inside of the motor continuously to the plate recess and bending the open end. A yoke housing having a bearing arrangement portion, a plate arranged in the plate arrangement recess of the yoke housing and fixed integrally with the yoke housing, mounted on the bearing arrangement portion from the motor inside side and held by the plate and the bearing support portion Bearing and
A bearing device for a motor, comprising: 2. The motor bearing device according to claim 1, wherein the plate and the yoke housing are painted together.