JPH0635646Y2 - Lead wire drawing structure for rotating electrical machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a lead wire drawing structure for a rotary electric machine, for example, a structure effectively used for a drive motor of a wiper drive device.

[Conventional technology]

As a drive motor for a conventional wiper drive device, a cylindrical yoke whose flange portion is formed so as to project outward in the radial direction at an opening at one end, and a flange portion of this yoke are adapted to close the opening. The rotor is rotatably supported at both ends of its shaft by one end of the yoke and the end bracket, and the rotor shaft integrally connects to the end bracket. Some of them are configured to drive a worm gear speed reduction mechanism installed in an installed gear box.

In the drive motor of this wiper device, when the lead wire is pulled out from the inside of the yoke, a grommet mounting hole is opened in the closing wall of the end bracket so as to penetrate in the axial direction, and the grommet passing through the lead wire is inserted into this mounting hole. A structure in which one end of a lead wire is axially inserted and fitted is generally adopted.

However, in such a lead wire lead-out structure,
First, it is necessary to insert one end of the lead wire into the grommet mounting hole, and the lead wire is divided into the inside and outside of the motor by the end bracket on which the grommet is fitted. It is necessary to perform a complicated work such as a brush connection work or a terminal fitting connection work (crimping work, soldering work, etc.) to the end of the lead wire in a state of being assembled to the bracket. Further, although this work is complicated, it is a work involving the end brackets, so that it is necessary to perform it at the time of assembling the motor, which poses a problem that it becomes an obstacle to rationalizing the production when assembling the motor.

Therefore, as a conventional lead wire drawing structure for a rotary electric machine of this type, as shown in FIG. 7, a substantially rectangular grommet mounting hole 2 is formed on the outer circumference of the end bracket 1 in the radial direction. A structure has been proposed in which a grommet 3 that is cut inwardly and has a lead wire 4 inserted therethrough is inserted in the mounting hole 2 radially inward from the outer peripheral opening of the end bracket 1 and is fitted therein. There is.

According to such a lead wire lead-out structure for a rotating electric machine, it is not necessary to insert one end of the lead wire into the grommet mounting hole 2, so that the caulking work for both ends of the lead wire 4 penetrated by the grommet 3 is performed. After the soldering work is performed, the grommet 3 can be inserted into the mounting hole 2 of the end bracket 1 from the radial direction. Therefore, the connecting component for the lead wire 4 can be unitized (made into a wire harness) in advance, so that the work for the lead wire 4 can be rationalized.

[Problems to be solved by the device]

However, in the lead wire lead-out structure of the rotary electric machine, in which the grommet 3 is radially inserted and fitted into the rectangular mounting hole 2 which is cut so that one end is open at the outer periphery of the end bracket 1, As shown in the figure, when the grommet 3 is fitted in the mounting hole 2, the grommet 3
Since a part of the compression reaction force acts as a force F that pushes the grommet 3 itself outward in the radial direction with respect to the mounting hole 2,
There is a problem that the airtightness at the closed end 2a of the mounting hole 2 is reduced.

An object of the present invention is to provide a lead wire drawing structure for a rotary electric machine that can reliably maintain airtightness.

[Means for Solving the Problems]

In the lead wire drawing structure for a rotating electric machine according to the present invention, an end bracket that supports the other end of the rotor shaft is fixed to the opening of the yoke that supports one end of the rotor shaft so as to close the opening. A grommet is fitted to the outer circumference of the end bracket, and a lead wire drawing structure of a rotating electric machine in which lead wires are inserted into the grommet, and a front-rear circular grommet mounting hole is provided on the outer circumference of the end bracket. One end of the rectangular shaped portion is opened so as to open at the outer circumference of the end bracket, and the grommet is formed in a front rear circular columnar shape fitted in the mounting hole, and the grommet has the lead. The grommet is inserted and fitted from the axial direction into the mounting hole in a state where the wire is inserted.

[Action]

In the assembling work of the lead wire drawing structure of the rotary electric machine according to the above means, when the grommet is fitted into the mounting hole of the end bracket, first, the grommet is formed in the square shaped portion of the mounting hole opened on the outer periphery of the end bracket. The lead wire inserted through is laterally moved in the radial direction at the intermediate portion and inserted.

Then, the lead wire was inserted into the mounting hole (hidden)
In this state, the grommet is inserted and fitted in the mounting hole in the axial direction.

As a result, the lead wire does not have to be inserted through the grommet mounting hole from its end.Before the grommet is fitted into the mounting hole of the end bracket, pre-assemble the terminal metal fittings and brushes on both ends of the lead wire. The lead wire system can be unitized (wire harness).

Then, in the state where the grommet is fitted in the mounting hole of the end bracket, the columnar portion of the grommet is fitted in the circular portion of the mounting hole, so the compression reaction force of the grommet acts in all directions with respect to the center of the circle. As a result, a sealed (airtight) state is reliably created on the entire circumference of the grommet.

〔Example〕

FIG. 1 is an exploded perspective view showing a lead wire drawing structure of a rotary electric machine according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing its assembled state, and FIG. 3 is also III-III of FIG. Sectional drawing which follows the line, FIG.4 (a), (b), (c), (d) shows the left side view, front view, right side view and top view which show a grommet.
FIG. 5 is a partially omitted plan view showing a lead wire unit, FIG.
The figure is a partially omitted vertical sectional view showing a drive motor of a wiper drive device in which the lead wire drawing structure of the rotating electric machine is used.

In the present embodiment, the lead wire drawing structure of the rotating electric machine according to the present invention is configured as a leader wire drawing structure of the driving motor of the wiper driving device, and the driving motor 10 as the rotating electric machine includes a housing 11. ing. housing
The reference numeral 11 includes a yoke 12 formed in a substantially cylindrical shape with one end face 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. A rotor shaft 19 is laid on the center line in the housing 11, and the shaft 19 is rotatably supported by both bearing metals 15 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 surface 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. It 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 by using Bakelite, is concentric with the commutator 22, and is housed in the brush holder cover 24 fitted in the end bracket 13 to remove the brush holder cover 24. It is fixed to the yoke 12 and the end bracket 13 via. A plurality of brush holders 26 are radially arranged in the brush holder stay 25 to form a substantially square tubular shape, and a brush 28 having a pigtail 27 is slid on the outer peripheral surface of the commutator 22 in each brush holder 26. They are housed slidably in contact with each other.

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.
It is opened so as to penetrate inward and outward in the axial direction, and a grommet described later is inserted and fixed in the mounting hole 29. The grommet mounting hole 29 is formed so that its cross-sectional shape is a front-rear circular shape, its radial shape portion 31 is arranged along the normal line of the end bracket 13, and its circular shape portion 30. The end side on the opposite side is formed so as to form the opening 32 on the outer periphery of the end bracket 13. Further, on the outer surface side end portion of the rectangular shaped portion 31, protruding portions 31a, 31a having a constant width and a constant height are provided so as to protrude inward in the width direction.

On the opening edge of the accommodation recess 23 of the end bracket 13, a male seal cage coupling portion 33 is formed in a circular ring shape so as to project toward the yoke side in the axial direction, and a yoke is formed on the outer circumference of the male cage cage coupling portion 33. The inner circumference of 12 is joined to the inro by sandwiching the seal ring. A cutout portion 34 is formed in the male inro cage coupling portion 33 at a position facing the grommet mounting hole 29 so as to allow the grommet to escape.
In the coupled state with 12, the grommet is fitted and positioned in the notch 34.

The grommet 35 is integrally molded using an elastic material such as rubber or resin, and the grommet mounting hole 29
Is formed in a columnar shape having a cross-sectional shape corresponding to the front-rear circular shape. That is, the grommet 35 has a mounting hole 29
A circular column shaped portion 36 corresponding to the circular shaped portion 30 and a prismatic shaped portion 37 corresponding to the square shaped portion 31 of the mounting hole 29 are provided.
Three lead wire insertion holes 38 are arranged substantially evenly in the cylindrical portion 36 and are formed so as to penetrate in the axial direction, respectively. The prism-shaped portion 37 is provided so as to radially project along a normal line on a part of the outer circumference of the column-shaped portion 36.
The length of 37 is set so that the outer side surface thereof is substantially aligned with the outer peripheral opening 32 of the mounting hole 29 when fitted into the rectangular shaped portion 31 of the mounting hole 29. On the outer peripheral surface of the grommet 35, a sealing portion 39 is arranged on the entire columnar portion 36 and prismatic portion 37, and is projected in a semicircular cross section.
In the state where the grommet 35 is fitted in the mounting hole 29, 39 is crushed by the inner peripheral surface of the mounting hole 29 to be compressed and deformed, and firmly presses against the mounting hole 29 to create a reliable sealing state. It has become.

In addition, a gripping piece 40 is provided on one end surface of the grommet 35, and has a cylindrical portion 36 and a prismatic shape on the center line of the front rear circular shape.
It is arranged so as to straddle 37 and is provided so as to project so as to project in the axial direction, and this gripping piece 40 is easily gripped by a gripping tool such as a finger or radio pliers. The side surface is formed in a thin plate shape having a substantially tongue shape. On the front and back surfaces of the gripping piece 40, two anti-slip parts 41 are arranged in a direction perpendicular to the length direction so as to project in a thin line shape. (Not shown) is prevented from slipping.

Further, the grommet 35 is provided with a protrusion 42 on the outer periphery of the cylindrical portion 36 on the end side where the gripping piece 40 is provided so as to project radially outward.
Is properly fitted in the mounting hole 29,
By engaging the outer opening edge of the grommet 35, it is possible to confirm that the grommet 35 is properly fitted in the mounting hole 29.

Next, the operation will be described.

When the motor 10 is assembled, the unit of each component is first assembled. In this case, the bearing metal 15, the metal holder 17, and the magnet 21 are assembled to the yoke 12, the bearing metal 16, the metal holder 18 and the seal ring are assembled to the end bracket 13, and the grommet 35
Three lead wires 43 are attached to the. Then, as shown in FIG. 5, the lead wire 43 group has a brush holder stay 25 and a brush holder cover 24 attached to one end thereof, a coupler or the like at the other end thereof, and a protective tube or a seal member or the like attached to an intermediate portion thereof. Be united.

Lead wire unit that has been unitized in advance in this way
44 is assembled in the grommet mounting hole 29 of the end bracket 13 in the assembly line as described later. Subsequently, the brush holder cover 24, the brush holder stay 25, the rotor, and the yoke are assembled in this order, and finally these are integrally fixed by screws.

Here, when the lead wire unit 44 is assembled to the end bracket 13, first, the lead wire of the lead wire unit 44 is
The 43-th group is inserted into the grommet mounting hole 29 by inserting the middle portion thereof laterally moved from the outer peripheral opening 32 of the mounting hole 29.

Then, in this state, the grommet 35 positioned in the recess 23 of the end bracket 13 is aligned with the mounting hole 29, and the gripping piece 40 of the grommet 35 is inserted into the mounting hole 29. Then, the end bracket 13 is inserted into the mounting hole 29.
The gripping piece 40 protruding to the outer surface side is gripped by a finger or a gripping tool (not shown) and pulled outward in the axial direction, so that the grommet 35 is inserted into the mounting hole 29. At this time, gripping of the gripping piece 40 with a tool or the like is ensured by the anti-slip part 41.

By the way, the grommet 35 is attached to the mounting hole 29 in the end bracket.
It is pressed outward from the recess 23 side of 13 in the axial direction, and the mounting hole 29
When the grommet 35 is inserted into the mounting hole 29, the grommet 35 is compressed and deformed to bulge outward in the radial direction, making it difficult to insert the grommet 35 into the mounting hole 29.

However, in this embodiment, the grommet 35 is the gripping piece.
Since it is pulled by 40 and inserted into the mounting hole 29, the work of inserting the grommet 35 into the mounting hole 29 becomes extremely easy. This is because the grommet 35 is elastically deformed by being pulled so as to be thin and easily penetrates into the mounting hole 29.

When the grommet 35 is properly inserted into the mounting hole 29,
Since the protrusion 42 is engaged with the outer surface opening edge of the mounting hole 29, it is confirmed that the grommet 35 is properly mounted in the mounting hole 29.

When the grommet 35 is properly fitted into the mounting hole 29, the columnar portion 36 of the grommet 35 is compressed and deformed in the radial direction toward the center O in the circular portion 30 of the mounting hole 29. The pressing force F due to acts from the center O in all directions. As a result, even if the mounting hole 29 is opened outward in the radial direction at the opening 32 of the rectangular shaped portion 31, the grommet 35 is retained in the circular shaped portion 30 of the mounting hole 29 at the cylindrical shaped portion 36, and is locally retained. Therefore, it is possible to prevent the occurrence of a portion where the sealing state is deteriorated.

Further, in the state where the grommet 35 is properly fitted in the mounting hole 29, the seal portion 39 protruding on the outer surface is attached to the mounting hole 29.
Since it is effectively crushed and brought into close contact with the inner peripheral surface of, the sealing state becomes extremely good. At this time, since the prism-shaped portion 37 of the grommet 35 is pressed against the protruding portion 31a protruding from the end of the square-shaped portion 31 of the mounting hole 29 on the outer surface side,
The prismatic portion 37 is in a state of being compressed and deformed, and as a result,
The seal portion 39 of the prism-shaped portion 37 is brought into close contact with the inner surface of the square-shaped portion 31, and the sealed state around the prism-shaped portion 37 and between the seal ring and the yoke is completed.

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 gripping piece 40 and the protrusion 42 of the grommet 35 can be omitted.

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

[Effect of device]

As described above, according to the present invention, the end of the lead wire is not penetrated through the mounting hole of the end bracket, but the middle portion of the lead wire is inserted through the outer peripheral opening of the end bracket of the grommet mounting hole. Therefore, it is possible to assemble as a lead wire unit by performing the work of connecting a brush, coupler, etc. to the lead wire at the time of assembling parts regardless of the end bracket, and as a result, it is possible to rationalize the production of the motor. .

Moreover, since the grommet is fitted in the grommet mounting hole of the end bracket, its cylindrical portion exerts a pressing force on the inner peripheral surface of the circular shaped portion of the mounting hole from the center in all directions, so The reliability is high enough.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a lead wire drawing structure of a rotary electric machine according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing its assembled state, and FIG. 3 is also III-III of FIG. Sectional drawing which follows the line, FIG.4 (a), (b), (c), (d) shows the left side view, front view, right side view and top view which show a grommet.
FIG. 5 is a partially omitted plan view showing a lead wire unit, FIG.
The figure is a partially omitted vertical sectional view showing a drive motor of a wiper drive device in which the lead wire drawing structure of the rotating electric machine is used. FIG. 7 is an enlarged partial sectional view showing a conventional example. 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 …… Committer, 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 …… Circular shape part, 31 …… Square shape part, 32 …… Outer peripheral opening part, 33 …… Male seal joint part, 34 …… Notch part, 35 …… Grommet, 36 …… Cylinder shaped part, 37 …… Square shaped part, 38 …… Lead wire insertion hole,
39 …… Seal part, 40 …… Grip part, 41 …… Slip prevention part,
42 ... Protrusion.

Claims (2)

[Scope of utility model registration request] 1. An end bracket that supports the other end of the rotor shaft is fixed to an opening of a yoke that supports one end of the rotor shaft so as to close the opening, and a grommet is provided on the outer periphery of the end bracket. In the lead wire lead-out structure of the rotating electrical machine in which the lead wire is inserted into this grommet, the front and rear circular grommet mounting holes are formed on the outer circumference of the end bracket, and one end of the square shaped part is the end. While being opened so as to open on the outer periphery of the bracket, the grommet is formed in a front rear circular columnar shape fitted into this mounting hole, and in a state where the lead wire is inserted into this grommet, A lead wire lead-out structure for a rotating electric machine, wherein the grommet is inserted and fitted in the mounting hole from an axial direction. 2. A gripping piece is integrally provided on one end of the grommet so as to project in the axial direction, and the grommet is pulled into the fitting hole and fitted into the mounting hole. The lead wire drawing structure for a rotating electric machine according to claim 1, wherein the lead wire drawing structure is for a utility model.