JPH10225044A - Dynamo-electric machine and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dynamo-electric machine which fills the role of a sufficient sealing function, without augmenting processes and increasing the cost of members and its manufacture. SOLUTION: This dynamo-electric machine has a yoke 14, in which an armature 12 is housed, an end bracket 22 with a bonding section 40 for installation with the opening end of the yoke 14, and an O-ring 46 elastically deformed and interposed between the yoke 14 and the end bracket 22. The yoke 14 has a tapered surface 32 in the connecting sections of a surface 30a of a flange 30 and an inner circumferential surface 14a. The bonding section 40 has a front- end wall surface 42 facing the surface 30a and a peripheral wall surface 44 facing the inner circumferential surface 14a, so as to hold the tapered surface 32 of the yoke 14. The O-ring 46 is compressed and deformed by the tapered surface 32, a peripheral wall surface 44, and a front-end wall surface 42.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine characterized by a seal structure and a method of manufacturing the same.

[0002]

BACKGROUND OF THE INVENTION In a wiper motor, a bracket for closing an open end of the yoke is attached to a bottomed cylindrical yoke for accommodating an armature as a rotating body. In some cases, the bracket is formed as a part of a housing containing a gear for reducing and outputting the rotation of the armature. In such a wiper motor, between the flange formed at the opening end of the yoke and the bracket,
Water is stopped by an O-ring made of an elastic body.

However, since the flange formed on the yoke is formed by deep drawing and has a rounded bent portion, the flange has a uniform surface pressure along the periphery of the open end of the yoke. The ring could not be compressed and could not provide a sufficient sealing function.

In this respect, for example, according to the wiper motor described in the microfilm of Japanese Utility Model Application Laid-Open No. 3-48346,
In order to prevent water from stopping at the joint between the yoke and the bracket, a groove is formed by cutting in the mating surface of the bracket with the yoke, and packing is provided in the groove as a seal member.

However, in such water stopping means,
Not only the number of cutting steps for forming the grooves increases, but also the cost of parts increases due to the complicated shape of the packing.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and an object of the present invention is to provide a rotating electric machine capable of performing a sufficient sealing function without increasing the number of steps and cost of members, and a method of manufacturing the same. It is in.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the invention according to claim 1 comprises a yoke for accommodating an armature, a bracket having a joint for attaching the yoke to an open end thereof, A sealing member elastically deformed and interposed between the yoke and the bracket,
The yoke has a tapered surface at a connecting portion between the distal end surface on the opening end side and any one of the inner and outer peripheral surfaces, and the connecting portion faces the distal end surface so as to sandwich the tapered surface of the yoke. And a peripheral wall surface facing the peripheral surface, wherein the seal member is deformed by being compressed by the tapered surface, the peripheral wall surface, and the distal wall surface.

According to the present invention, the yoke is attached to the joint portion of the bracket, and the seal member is compressed by the joint portion of the yoke and the bracket to stop water. Here, the portion of the yoke that compresses the seal member is a tapered surface, that is, a flat surface. Therefore,
Since the seal member is compressed with a flat surface, an appropriate elastic force can be obtained, and sufficient sealing can be achieved between the yoke and the bracket.

According to a second aspect of the present invention, in the rotating electric machine according to the first aspect, the yoke has a flange extending outward at the opening end, and the tapered surface is formed between the inner peripheral surface of the yoke and the inner peripheral surface of the yoke. It is characterized in that it is formed at a connection portion with the surface of the flange.

According to the present invention, the strength of the open end of the yoke can be increased by having the flange. The tapered surface for compressing the seal member is formed on the inner peripheral side of the opening end, and a joint portion of the bracket is formed correspondingly.

According to a third aspect of the present invention, in the rotating electric machine according to the first or second aspect, the bracket forms a part of a housing containing a gear for reducing and outputting the rotation of the armature. It is characterized by the following.

The present invention can be applied to a rotating electric machine having such a speed reduction mechanism.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a rotating electric machine in which a seal member is interposed between a yoke for accommodating an armature and a bracket attached to the yoke to achieve water stoppage. A step of forming a flange at the opening end by deep drawing at the same time as forming a tapered surface at a connection portion between the inner peripheral surface of the yoke and the surface of the flange; and interposing the tapered surface between the brackets, and Forming a joint having a shape facing the inner peripheral surface of the yoke and the surface of the flange; and sealing the sealing material so as to be compressed by the tapered surface of the flange and the joint of the bracket. Arranging,
It is characterized by including.

According to the present invention, since the step of forming the tapered surface on the yoke is performed simultaneously with the step of forming the flange, the tapered surface can be formed without increasing the number of steps.

According to a fifth aspect of the present invention, in the method for manufacturing a rotary electric machine according to the fourth aspect, the deep drawing is performed using a press die that forms the flange and the tapered surface. Features.

Such a press die can be obtained at a low cost because only a part of the conventional press die for forming a flange is modified.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a rotating electric machine according to an embodiment of the present invention. The rotating electric machine shown in the figure is a wiper motor for a vehicle,
And a speed reduction unit 20.

The motor section 10 includes an armature 12, and a bottomed cylindrical yoke 14 for accommodating the armature 12.

The bottom of the yoke 14 has an armature 12
A radial bearing 16 and a thrust bearing 18 for supporting the shaft 12a are mounted. The magnet 11 is provided on the inner peripheral surface of the yoke 14. In addition, the structure of the brush, the commutator, and the like is the same as that of the conventional motor, and the description is omitted.

An end bracket 22 is attached to an open end of the yoke 14. End bracket 22
Is formed as a part of the housing 24. The housing 24 accommodates a speed reduction mechanism including gears and the like (not shown), and covers the gear cover 26 to form the speed reduction unit 20.

The present embodiment has a feature in a portion where the yoke 14 and the end bracket 22 are mounted. The two are so-called indigo joints, and the configuration will be described below.

The yoke 14 has an outwardly extending flange 30 at the open end. The formation of the flange 30 reinforces the open end of the yoke 14.
Further, a connection portion between the inner peripheral surface 14a of the yoke 14 and the surface 30a of the flange 30 continuous with the inner peripheral surface 14a includes:
A flat tapered surface 32 is formed along the open end of the yoke 14.

The end bracket 22 has a connecting portion 40 for attachment to the yoke 14. The connecting portion 40 includes a distal end wall surface 42 that faces and contacts the surface 30 a of the flange 30 that is a distal end surface of the yoke 14, a peripheral wall surface 44 that faces and contacts the inner peripheral surface 14 a of the yoke 14,
Are formed. The distal end wall surface 42 and the peripheral wall surface 44 are connected substantially at right angles, and sandwich the tapered surface 32 formed on the flange 30. The yoke 14 fits into the coupling portion 40 having such a shape.

The yoke 14 and the end bracket 22
An O-ring 46 made of an elastic material such as rubber is provided between them to prevent water from flowing. The O-ring 46 is previously mounted on the connecting portion 40 of the end bracket 22. Then, the yoke 14 is attached so as to sandwich the O-ring 46, and the yoke 14 and the end bracket 22 are tightened by the screws 48. In this way, the O-ring 46 is compressed between the yoke 14 and the coupling portion 40 of the bracket 22, and hermetically seals the space between the yoke 14 and the bracket 22 by elasticity.

More specifically, the O-ring 46 includes a tapered surface 32 of the yoke 14 and a distal end wall surface 42 of the end bracket 22.
And the peripheral wall 44. In particular, the tapered surface 3
Since the 2 is formed by the press die, the O-ring 46 can be compressed from the yoke 14 with a surface having high dimensional stability. Thereby, a sufficient sealing function can be achieved by an appropriate elastic force. In addition, dimensional accuracy is improved by forming the tapered surface 32 with a press die,
The compression ratio of the O-ring 46 in surface contact can be satisfied.

It is preferable that the volume ratio of the compressed portion of the O-ring 46 to the whole is about 8% at the minimum and about 30% at the maximum from the limit of the compression set of the rubber material. In addition, the size of the tapered surface 32 needs to be within a range that can be accommodated in the coupling portion 40 of the end bracket 22 even when the excess thickness is extruded by press molding. Specifically, O
It is determined from the cross-sectional diameter of the ring 46 and the like.

The present embodiment is configured as described above, and the manufacturing process of the yoke 14 will be described below. FIG. 2 is a view showing a state where the manufacture of the yoke 14 has been completed.

As shown in FIG.
This is performed by deep drawing. That is, the metal plate 52 is placed on the die 50 having the concave shape 50a corresponding to the yoke 14, and a part of the metal plate 52 is formed by the punch 56 while the wrinkle holder 54 prevents unnecessary deformation.
To form the yoke 14.

The punch 56 has a tapered surface 56a corresponding to the tapered surface 32 of the flange 30 of the yoke 14. Therefore, when forming the yoke 14, not only the flange 30 but also the tapered surface 32 can be formed simultaneously. Thus, although the tapered surface 32 is formed, it is only necessary to change the shape of the punch 56, so that an increase in the number of steps can be avoided.

The present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above embodiment, the present invention is applied to a wiper motor. However, the present invention can be applied to other motors, and further, the present invention can be applied to a generator other than a motor.

[0031]

[Brief description of the drawings]

FIG. 1 is a diagram showing a rotating electric machine according to an embodiment to which the present invention is applied.

FIG. 2 is a diagram illustrating a manufacturing process of a yoke of the rotating electric machine according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Armature 14 Yoke 14a Inner peripheral surface 20 Reduction part (gear) 22 End bracket (bracket) 24 Housing 30 Flange 30a Surface 32 Tapered surface 40 Coupling part 42 Tip wall surface 44 Peripheral wall surface 46 O-ring 56 Punch (press type)

Claims (5)

[Claims] 1. A yoke for accommodating an armature, a bracket having a joint for attachment to an open end of the yoke, and a seal member elastically deformed and interposed between the yoke and the bracket. The yoke has a tapered surface at a connecting portion between the distal end surface on the opening end side and one of the inner and outer peripheral surfaces, and the coupling portion has the distal end so as to sandwich the tapered surface of the yoke. A rotating surface, wherein the sealing member is deformed by being compressed by the tapered surface, the peripheral wall surface, and the distal wall surface. Electric machine. 2. The rotating electric machine according to claim 1, wherein the yoke has a flange extending outward at the opening end, and the tapered surface connects an inner peripheral surface of the yoke to a surface of the flange. A rotating electric machine formed in a part. 3. The rotating electric machine according to claim 1, wherein the bracket forms a part of a housing containing a gear for reducing and outputting the rotation of the armature. Electric machine. 4. A method of manufacturing a rotating electric machine in which a seal member is interposed between a yoke for accommodating an armature and a bracket attached to the yoke to achieve water stoppage, wherein a deep end is provided at an open end of the yoke. Forming a flange by drawing and, at the same time, forming a tapered surface at a connecting portion between the inner peripheral surface of the yoke and the surface of the flange; Forming a joint having a shape facing the surface and the surface of the flange; and arranging a sealing material so as to be compressed by the tapered surface of the flange and the joint of the bracket. A method for manufacturing a rotating electric machine, comprising: 5. The method of manufacturing a rotating electric machine according to claim 4, wherein the deep drawing is performed using a press die that forms the flange and forms the tapered surface. Production method.