JPH0715322Y2 - Sealing structure of rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a seal structure for a rotary electric machine, and more particularly to an improvement in the seal structure at a mating surface between a yoke and an end bracket forming a housing. The present invention relates to a motor effectively used for a driving motor of a driving device.

[Conventional technology]

As a drive motor for a conventional wiper drive device, a cylindrical yoke having a flange portion protruding outward in a radial direction at an opening at one end, and a seal for closing the opening at the flange portion of the yoke. The rotor is rotatably supported at both ends of its shaft by the one end of the yoke and the end bracket, and is integrally connected to the end bracket by the rotor shaft. Some gearboxes are configured to drive a worm gear reduction mechanism installed in the gearbox.

In the drive motor of this wiper device, it is necessary to secure a sealed state between the mating surfaces of the yoke and the end bracket that substantially constitute the motor housing.

As a seal structure of such a rotary electric machine, for example, a fourth structure
As shown in the figure, an O-ring 8 as a seal member is provided in a gap 7 formed by the bent portion 3 of the flange portion 2 of the yoke 1, the flange portion 5 of the end bracket 4 and the male seal cage coupling portion 6. Some have been laid.

However, the gap 7 in which the O-ring 8 is laid depends on the shape of the outer curved portion R in the bending portion 3 of the yoke, and the shape of the outer curved portion R varies depending on the plate thickness of the material and the change in the processing conditions. Therefore, there is a case where a sufficiently satisfactory sealing performance cannot be obtained.

Therefore, as a seal structure of a rotary electric machine that solves such a problem, as shown in FIG. 5, an O-ring is housed in the outer edge of the end face of the end bracket side flange portion 5 on the side of the male cage connection portion 6 side. The groove 9 is recessed in a ring shape, and the O-ring 8 is housed in the housing groove 9 so that the O-ring 8 contacts the flat surface of the flange portion 2 of the yoke 1. Can be considered.

[Problems to be solved by the device]

However, in the seal structure of the rotating electric machine in which the O-ring housing groove 9 is recessed in the outer edge portion of the flange portion 5 of the end bracket 4, when the O-ring 8 is inserted into the housing groove 9, the O-ring 8 Is elastically deformed, the O-ring 8 is twisted during the insertion work of the O-ring 8 into the groove 9 or the joining work of the yoke 1 and the end bracket 4, and the workability of assembling is deteriorated. It

An object of the present invention is to provide a seal structure for a rotary electric machine that can improve workability in assembling and seal performance.

[Means for Solving the Problems]

A seal structure for a rotary electric machine according to the present invention comprises a cylindrically formed yoke (12), a flange portion (35) bent and formed at an opening of one end of the yoke (12) so as to project outward in the radial direction, and the yoke (12). The end bracket (13) in which the male cage connector (35) is coupled to the opening of (12) is aligned with the flange portion (37) that is integrally formed so as to project outward in the radial direction, A rotary electric machine in which a seal member accommodation groove (39) is recessed in a ring shape in the mating surface of the end bracket (13) and a ring shaped seal member (40) is accommodated in the accommodation groove (39). In the seal structure of (1), the inner periphery of the seal member accommodation groove (39) coincides with the outer periphery of the male seal cage coupling portion (33), and the outer periphery thereof is formed on the bent portion of the yoke side flange portion (35). Is located outside the curved part (R), The groove bottom is formed into a flat surface, and the seal member (40) is integrally formed by using an elastic material and is composed of a main body portion (41) and a protruding portion (42). The body portion (41) has an inner diameter slightly smaller than the outer diameter of the male cage connection portion (33), an outer diameter smaller than the outer diameter of the seal member accommodating groove (39), and a ring shape having a constant thickness. On the other hand, the protrusion (42) is formed on the main body (4
In the outer edge portion of the opening side end surface of the seal member accommodating groove (39) of 1), a blank portion (43) is formed in a portion facing the outer curved portion (R) formed in the bent portion of the yoke side flange portion (35). ) Is formed integrally with the seal member accommodating groove (39) in the opening direction to form a ring shape, and the seal member (40) is formed in the accommodating groove (39) in the body portion (4).
1) is accommodated, and the protruding portion (42) is compressed and deformed by the flat surface portion (F) other than the curved portion (R) of the yoke side flange portion (35).

[Action]

According to the above-mentioned means, during the insertion work of the seal member into the accommodation groove, the seal member is guided by the outer peripheral surface of the male cage connection portion and inserted into the accommodation groove. Since it is formed in a ring shape having a width, it is properly laid in the accommodation groove and is maintained in an appropriate state without being twisted in the accommodation groove.

Further, since the protruding portion of the seal member is arranged on the outer edge portion of the main body portion, it comes into contact with the flat surface of the yoke side flange portion avoiding the bent portion after the yoke and the end bracket are coupled. As a result, the protruding portion of the seal member comes into close contact with the flat surface of the yoke-side flange portion uniformly over the entire circumference, thereby creating an extremely good sealed state.

〔Example〕

FIG. 1 is an exploded perspective view of a seal structure of a rotary electric machine according to an embodiment of the present invention, with some parts omitted, and FIG. 2 is an enlarged partial sectional view showing an assembled state of the rotary electric machine. 4 is a partially omitted vertical cross-sectional view showing a drive motor of a wiper drive device in which the seal structure of FIG.

In this embodiment, the seal structure of the rotary electric machine according to the present invention is configured as the seal structure of the drive motor of the wiper drive device.
Has a housing 11. The housing 11 is composed of a yoke 12 formed in a substantially cylindrical shape with one end surface opened and the other end closed, and an end bracket 13 fitted on the opening side of the yoke 12. Oil-impregnated bearing metals (hereinafter, sometimes referred to as bearing metals) 15 and 16 as bearing members are arranged in the closing wall 14 of the yoke 12 and in the center of the end bracket 13, respectively. Are held by metal holders 17 and 18, respectively. The bearing metals 15 and 16 are formed in a convex spherical shape in outer shape, and by rotating in three-dimensional directions with respect to the metal holders 17 and 18, the self-aligning function is exhibited. Inside the housing 11, a rotor shaft 19 is installed on the center line, and the rotor shaft 19 is a double bearing metal 1
It is rotatably supported by 5 and 16.

An armature 20 is fixedly mounted on the rotor shaft 19 in an intermediate portion, and the armature 20 faces a plurality of magnets 21 arranged on the inner peripheral surface of the yoke 12 at substantially equal intervals in the circumferential direction. It is arranged as follows. On the rotor shaft 19, a commutator 22 for supplying power to the armature 20 is an end bracket.
It is placed and fixed at the end on the 13th side. End bracket
A gear box (not shown) is arranged on the opposite side of the yoke 12 and integrally connected to the rotor 13. The rotor shaft 19 is inserted in the gear box and is also installed in the gear box. The worm gear reduction mechanism is operated (not shown).

A recess 23 for accommodating the brush holder stay is recessed in the end face of the end bracket 13 on the yoke side at a constant depth in the axial direction, and a brush holder stay 25 is inserted in the recess 23 via a brush holder cover 24. Is housed. The brush holder cover 24 is integrally molded using a synthetic resin, and has a base 24a formed in a disk shape having substantially the same diameter as the recess 23 of the end bracket 13, and a short length arranged on the outer periphery of the base 24a. And a side wall portion 24b formed in a cylindrical shape.
The brush holder stay 25 is integrally formed into a disc shape using bakelite, and is concentric with the commutator 22.
Further, it is housed in the brush holder cover 24 fitted in the end bracket 13 and fixed to the end bracket 13 via the brush holder cover 24. A plurality of brush holders 26 are radially arranged in the brush holder stay 25 to form a substantially square tubular shape. Each brush holder 26 has a brush 28 having a pigtail 27 and a commutator 22.
Are slidably accommodated so as to be in sliding contact with the outer peripheral surface of each.

A mounting hole 29 for mounting the grommet is provided on the outer peripheral portion of the end bracket 13 from the side wall portion 13a of the end bracket to the closed portion 13b.
The grommet 30 having the lead wire 31 inserted therein is inserted and fixed in the mounting hole 29.

On the opening edge of the accommodation recess 23 of the end bracket 13, there is formed a male seal cage coupling part 33 in the shape of a circular ring so as to project toward the yoke side in the axial direction. The inner circumference of 12 is joined by Ingar basket. A notch 34 is cut at a position facing the grommet mounting hole 29 in the male and female cage coupling portion 33 so as to escape the grommet 30,
In the connected state of the end bracket 13 and the yoke 12,
The grommet 30 is fitted and positioned in the notch 34.

In the present embodiment, the flange portion 35 is provided in the opening of the yoke 12.
Are integrally formed by deep drawing so as to project outward in the radial direction, and at least one pair of screw insertion holes 36 are formed in the flange portion 35 at intervals in the circumferential direction. An outer curved portion R is naturally formed at the bent portion of the flange portion 35.

On the other hand, a flange portion 37 is arranged on the outer periphery of the end bracket 13 so as to be in contact with the male seal cage coupling portion 33, and is integrally formed so as to project outward in the radial direction.
There are formed a plurality of female screw holes 38, which are arranged so as to face the respective screw insertion holes 36 of the yoke side flange portion 35. An accommodation groove 39 for accommodating packing as a seal member is formed in a circular ring shape having a rectangular cross section, and is recessed in an end surface of the end bracket side flange portion 37 on the male seal basket coupling portion 33 side. That is, the accommodation groove 39 is formed as a circular annular groove having a constant width and a constant depth,
In addition, the inner rising wall surface is located on the extension line of the outer peripheral surface of the male-ink cage coupling portion 33, and the outer rising wall surface is located on the flat surface portion F outside the outer curved portion R of the yoke side flange portion 35. Has been formed.

The packing 40 as a sealing member accommodated in the accommodating groove 39 is integrally formed using an elastic material such as rubber or resin, and is formed in a circular ring shape having a diameter slightly smaller than the accommodating groove 39. Main body 41 and this main body 41
A circular ring-shaped protrusion 42 that is provided so as to protrude in the axial direction at the outer edge of the one end surface. The circular ring-shaped protrusion 42 is formed to have a semicircular cross section, and a blank portion 43 is formed in the inner portion thereof.

Next, the operation will be described.

When the motor 10 having the above structure is assembled, first, the units of the respective parts are assembled. In this case, the yoke 12 has a bearing metal 15, a metal holder 17, and a magnet.
21 is assembled, the lead wire 31 is inserted into the grommet 30, and the lead wire 31 has one end connected to the pigtail 27 of the brush 28 installed together with the brush holder stay 25 and the brush holder cover 24, and the other end. A coupler or the like (not shown) is connected to. Then, the bearing metal 16 and the metal holder 18 are assembled to the end bracket 13, and the packing 40 is laid in the accommodation groove 39.

In the work of laying the packing 40 in the housing groove 39, the packing 40 can be guided by the outer peripheral surface of the male seal cage coupling portion 33 of the end bracket 13 and inserted into the housing groove 39. Since is formed in a ring shape having a width in the radial direction, the packing 40 is properly laid in the accommodation groove 39, and the proper laid state is maintained in the accommodation groove 39.
When the packing 40 is inserted into the accommodation groove 39,
Is formed in a ring shape having a diameter slightly smaller than the accommodation groove 39, a gap 44 is formed in the accommodation groove 39 outside the packing 40.

The unitized parts are then assembled in a motor assembly line. That is, the end bracket 13 has a brush holder cover 24, a brush holder stay 25,
The grommet 30 is assembled, the rotor shaft 19 is inserted, and then the yoke 12 is relatively inserted into the rotor shaft 19 and fitted into the male seal cage coupling portion 33 of the end bracket 13. Then, the screw 45 is inserted into the insertion hole 36 of the yoke 12 and screwed into the female screw hole 38 of the end bracket 13, whereby the yoke 12 and the end bracket 13 are fastened and integrated.

By the fastening of the yoke 12 and the end bracket 13, the packing 40 is sandwiched between the mating surfaces of the flange portions 35 and 37 of the two. In this state, packing
Since the protruding portion 42 of 40 is arranged on the outer edge portion of the main body portion 41, it comes into contact with the flat surface portion F of the yoke flange portion 35 that avoids the outer curved portion R. Further, since the blank portion 43 is formed inside the protruding portion 42 and the gap 44 is formed outside the main body portion 41 in the accommodation groove 39, the flat surface portion F of the yoke side flange portion 35 is formed. When the protrusion 42 is crushed by being contacted with, the protrusion 42 is appropriately elastically deformed to uniformly and uniformly adhere to the flat surface portion F of the yoke flange portion 35. As a result, regardless of the processing accuracy of the outer curved portion R of the yoke flange portion 35, the packing 40
Will create a very good seal.

The present invention is not limited to the above embodiment,
It goes without saying that various modifications can be made without departing from the spirit of the invention.

For example, the cross-sectional shape of the protruding portion 42 of the packing 40 as the seal member is not limited to the semicircular shape, but may be a triangular shape, a trapezoidal shape, an elliptical shape, a polygonal shape, or the like.

Further, in the above-mentioned embodiment, the case where it is applied to the drive motor of the wiper drive device has been described. However, the seal structure according to the present invention can be applied to general rotary electric machines such as other general-purpose motors and generators. it can.

[Effect of device]

As described above, according to the present invention, it is possible to improve the sealing performance while preventing the deterioration of workability.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a seal structure of a rotary electric machine according to an embodiment of the present invention, with some parts omitted, and FIG. 2 is an enlarged partial sectional view showing an assembled state of the rotary electric machine. 4 is a partially omitted vertical cross-sectional view showing a drive motor of a wiper drive device in which the seal structure of FIG. FIG. 4 and FIG. 5 are enlarged partial sectional views showing two types of conventional examples. 10 ...... Drive motor (rotary electric machine) for wiper drive device, 11
…… Housing, 12 …… Yoke, 13 …… End bracket, 15,16 …… Bearing metal, 17,18 …… Metal holder,
19 …… Rotor shaft, 20 …… Armorature, 21 …… Magnet, 22 …… Commiter, 23 …… Brush holder stay housing recess, 24 …… Brush holder cover, 25 …… Brush holder stay, 26 …… Brush Holder, 27 ... Pigtail, 28 ...
… Brush, 29 …… Grommet mounting hole, 30 …… Grommet, 31 …… Lead wire, 33 …… Male seal connecting part, 34 …… Notch part, 35 …… Yoke side flange part, 36 …… Screw insertion hole, 37
...... Flange on the end bracket side, 38 ...... female screw hole,
39 ... accommodation groove, 39a ... escape groove, 40 ... packing (sealing member), 41 ... body part, 42 ... protruding part, 43 ... blank part, 44 ... gap, 45 ... screw.

Claims (1)

[Scope of utility model registration request] 1. A flange portion (35) bent and formed in an opening at one end of a yoke (12) formed in a tubular shape so as to project outward in the radial direction, and a male member in the opening of the yoke (12). The seal bracket connecting part (35) is aligned with the end bracket (13) to which the seal connector is connected, and the flange part (37) integrally formed so as to project outward in the radial direction. The end bracket (13) A seal member accommodating groove (39) is recessed in a ring shape on the mating surface of the ring-shaped seal member, and a ring-shaped seal member (40) is accommodated in the accommodating groove (39). The inner periphery of the seal member accommodation groove (39) is matched with the outer periphery of the male seal cage coupling portion (33), and the outer periphery of the outer curved portion (R) formed in the bent portion of the yoke side flange portion (35). It is located outside and its groove bottom is flat. The seal member (40) is integrally formed by using an elastic material, and is composed of a main body (41) and a protrusion (42). The main body (41) has an inner diameter of It is slightly smaller than the outer diameter of the male cage connector (33), smaller than the outer diameter of the seal member accommodating groove (39), and formed in a ring shape with a constant thickness, while the protrusion (42) ) Is a portion of the outer edge of the opening-side end surface of the seal member accommodation groove (39) of the main body portion (41) that faces the outwardly curved portion (R) formed at the bent portion of the yoke-side flange portion (35). Blank area (4
3) is formed integrally with the seal member accommodation groove (39) in the opening direction to form a ring shape, and the seal member (40) is formed in the accommodation groove (39) in the main body ( Four
1) is accommodated, and the protruding portion (42) is compressed and deformed by the flat surface portion (F) other than the curved portion (R) of the yoke side flange portion (35).