JPH0729718Y2 - motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a motor, and more particularly, to an improvement in a connecting structure between a brush holder and an end bracket, for example, a motor for driving a wiper driving device. About what is valid.

[Conventional technology]

As a drive motor for a conventional wiper drive device, as shown in FIG. 3, a brush holder 4 is screwed to an end bracket 3 integrally formed with a housing for accommodating a worm wheel (not shown). There is a fixed type in which the lead wire 5 is led out into a hole 7 provided in the end bracket 3 through a grommet 6 to measure the waterproofness of this portion. Further, the yoke 1 and the end bracket 3 are fixed with screws or the like, and an O-ring 2 is provided at a fitting portion thereof to be waterproof.

[Problems to be solved by the device]

In the drive motor of such a wiper drive device,
Two of the lead wires are connected to the coupler, and the other one is connected to a position detection switch provided on the lid of the worm wheel housing as a fixed position stopping mechanism. For this reason, when assembling, connect the lead wire that is connected to the coupler and position detection switch, and that has the grommet attached, through the hole of the end bracket, then solder it to the terminal of the brush holder, and then fix the brush holder to the end bracket. Will be done. At this time, since the end bracket interferes with the soldering work, workability is poor.

As a method to solve this, there is a method in which a U-shaped notch is provided in the end bracket, a grommet with a lead wire inserted is fitted into this notch, and this is sandwiched between the yoke and the end bracket, but it is not waterproof. bad.

An object of the present invention is to provide a motor that is easy to assemble while ensuring waterproofness.

[Means for Solving the Problems]

The motor according to the present invention is a motor in which an opening of one end of a yoke (12) is covered with an end bracket (13) and a brush holder stay (25) is arranged in the opening of the yoke (12). The brush holder stay (25) includes a first seal ring (24) between the yoke (12) and the end bracket (13) and a first seal ring (24) between the brush holder stay (25) and the yoke (12). The brush holder stay (25) is joined to each other via two seal rings (36), and a short cylindrical side wall portion (27) is integrally formed on the outer periphery of the brush holder stay (25). A grommet (30) having a lead wire (32) inserted therethrough is fitted.

[Action]

According to the above-mentioned means, the lead wire is not passed through the hole of the end bracket but is led out through the grommet mounting hole of the brush holder stay.
Since the work of connecting the brush and the lead wire can be performed independently of the end bracket, workability can be improved.

Moreover, the grommet is elastically fitted into the grommet mounting hole of the brush holder stay, and the seal member is sandwiched between the yoke and the brush holder stay, and between the end bracket and the brush holder stay. Therefore, sufficient waterproofness is ensured.

Further, since the brush holder stay is supported by the seal member in a floating manner from the end bracket and the yoke, the noise due to the vibration of the brush is silenced.

〔Example〕

FIG. 1 is a vertical sectional view showing a motor according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line II-II in FIG.

In this embodiment, the motor according to the present invention is configured as a drive motor for the wiper drive device.
10 includes 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 at the closing wall 14 of the yoke 12 and at the center of the end bracket 13, respectively. It is 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. A commutator 22 for supplying power to the armature 20 is arranged and fixed to the rotor shaft 19 at the end portion on the end bracket 13 side.

A recess 23 for accommodating the brush holder stay is recessed in the end surface of the end bracket 13 on the yoke side to a predetermined depth in the axial direction, and the first seal ring (O-ring) is located in the recess 23.
A brush holder stay 25 is accommodated via 24. The brush holder stay 25 is integrally formed using a synthetic resin, and has a disk-shaped base portion 26 having substantially the same diameter as the recess 23 of the end bracket 13 and an outer periphery of the base portion 26. Side wall portion 27 formed into a short cylindrical shape
It has and. Brush holder stay 25 is commutator 22
Is concentrically and sandwiched between the yoke 12 and the end bracket 13 and fixed to the two 12, 13. A brush accommodating portion 28 is provided on the base portion 26 of the brush holder stay 25.
Are arranged in a substantially square tubular shape, and the brushes 28A are slidably accommodated in the respective accommodating portions 28 so as to be in sliding contact with the outer peripheral surface of the commutator 22.

A mounting hole 29 for mounting the grommet is formed in the side wall portion 27 of the brush holder stay 25 so as to penetrate through the inside and outside in the radial direction, and a rubber grommet 30 is inserted and fixed in the mounting hole 29. The rubber grommet 30 is integrally formed in an elliptical flat plate shape, and a plurality of insertion holes 31 for inserting lead wires are formed on the major axis of the rubber grommet 30 so as to extend along the axial direction. A lead wire 32 electrically connected to the brush is inserted through each insertion hole 31, and the group of lead wires 32 are bundled together by a rubber grommet 30.

On the bottom surface of the housing recess 23 of the end bracket 13, a male cage connecting portion 33 is formed in a circular ring shape so as to protrude toward the yoke side in the axial direction, and a brush holder is provided on the outer periphery of the male cage connecting portion 33. The inner periphery of the side wall portion 27 of the stay 25 is sandwiched by the first seal ring 24 and is joined to the seal cage. A notch 34 is formed at a position facing the grommet mounting hole 29 in the male indigo cage coupling part 33 so as to allow the grommet 30 to escape, and when the end bracket 13 and the brush holder stay 25 are coupled, this notch 34 A grommet 30 is fitted into and is positioned in.

Further, a concave portion 35 for holding the second seal ring (O-ring) 36 is annularly cut with a constant width and constant depth on the outer peripheral edge of the base portion 26 of the brush holder stay 25 on the yoke side. The holder stay 25 is fitted in the opening of the yoke 12 with the second ring 36 fitted in the recess 35. Then, with the brush holder stay 25 being sandwiched, the joined yoke 12 and end bracket 13 are fastened together by screws 37.

In the drive motor of the wiper drive device, the end bracket 13 is integrally provided with a gear box of the wiper drive device (not shown).

Next, the operation will be described.

When assembling the motor 10, first, the units of the respective parts are assembled. In this case, the bearing metal 15, the metal holder 17, and the magnet 21 are assembled to the yoke 12,
End bracket 13 has bearing metal 16, metal holder 18
Is installed, and the brush 28
A, rubber grommet 30, and lead wire 32 are assembled.

Next, in the assembly line, the unit of each component is placed on the end bracket 13 in the order of the first seal ring 24, the brush holder stay 25, the second seal ring 36, the rotor, and the yoke 12, and finally integrated by the screw 37. Fixed.

In this way, since the work of connecting the lead wire 32 to the brush 28A of the brush holder stay 25 can be performed independently of the end bracket 13, workability is good, and there is no need to perform connection work in the assembly line. The complexity of is eliminated.

Moreover, seal rings 24 and 36 are interposed at the joint between the end bracket 13 and the brush holder stay 25 and at the joint between the brush holder stay 25 and the yoke 12, and the grommet 30 is the grommet of the brush holder stay 25. Since it is fitted in the mounting hole 29 by its own elasticity, it has high reliability of waterproofing.

Further, the brush holder stay 25 is floatingly supported by the seal rings 24 and 36, and even if the brush 28A vibrates during sliding with the commutator, the sound is silenced.

[Effect of device]

As described above, according to the present invention, the lead wire is not passed through the hole of the end bracket but is led out through the side wall portion of the brush holder stay. The connection work can be performed at the time of assembling the parts regardless of the end bracket, and the workability can be improved.

Moreover, the grommet is elastically fitted into the grommet mounting hole of the brush holder stay, and the seal member is sandwiched between the yoke and the brush holder stay, and between the end bracket and the brush holder stay. Therefore, the reliability of waterproofing is sufficiently high.

Further, the brush holder stay is floatingly supported from the end bracket and the yoke by the seal member, and the noise due to the vibration of the brush can be eliminated.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a motor according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line II-II in FIG. FIG. 3 is a sectional view showing a conventional example. 10 ... small motor, 11 ... housing, 12 ... yoke, 13 ... end bracket, 15,16 ... bearing metal, 17,18 ... metal holder, 19 ... rotor shaft, 20 ... armature, 21 ... magnet, 22 ... commiter, 23 ... Brush holder stay housing recess, 24, 36 ... Seal ring, 25 ... Brush holder stay,
26 ... Base part, 27 ... Side wall part, 28 ... Brush accommodating part, 28A ...
Brush, 29 ... Grommet mounting hole, 30 ... Rubber grommet,
31 ... Lead wire insertion hole, 32 ... Lead wire, 33 ... Male cage connection part, 34 ... Notch part, 35 ... Concave part, 37 ... Screw.

Claims (1)

[Scope of utility model registration request] 1. A motor in which an opening of one end of a yoke (12) is covered with an end bracket (13) and a brush holder stay (25) is arranged in the opening of the yoke (12), The brush holder stay (25) has a first seal ring (24) between the yoke (12) and the end bracket (13) and a second seal ring between the brush holder stay (25) and the yoke (12). The brush holder stay (25) is joined to each other via a ring (36), and a short cylindrical side wall portion (27) is integrally formed on the outer periphery of the brush holder stay (25). The side wall portion (27) has a lead wire. A motor having a grommet (30) fitted with (32) inserted therein.