JPH0561864B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a rotating electrical machine equipped with a composite body of a brush holder made of resin and a bracket made of metal, and in particular, the present invention relates to a rotating electric machine equipped with a composite body of a brush holder made of resin and a bracket made of metal, and in particular, the contact surface between the bracket and the brush holder. For example, a composite of a bracket and a brush holder (hereinafter referred to as
It is called a bracket unit. ), which is an effective technique for use in a bracket in which a brush holder is integrally molded with resin.

[Conventional technology]

As a bracket unit used in a starter motor, one in which a brush holder is integrally molded using resin on a bracket formed into a thin plate shape has been proposed (for example,
(Refer to Publication No. 58843).

[Problem that the invention seeks to solve]

In such a brush holder, if an iron-based material is used for the bracket and a nylon resin is used for the brush holder, when an environmental test such as a thermal shock test is conducted, the heat between the bracket and the brush holder will be reduced. Due to the difference in expansion coefficients, a relative misalignment occurs between the contact surfaces of the two, resulting in a problem in that the airtightness and liquidtightness of the starter motor housing to which this bracket unit is assembled deteriorates. but,
This was revealed by the present inventor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotating electrical machine that can prevent deterioration in sealing performance due to relative misalignment between the contact surfaces of a bracket and a brush holder.

[Means for solving problems]

The rotating electric machine according to the present invention is a rotating electric machine in which a resin-molded brush holder 20 is fixed to a bracket 21, and this bracket 21 is in contact with an opening of a yoke 4, and the bracket 21 is made of metal. The bracket 21 is formed into a thin plate shape using a material, and is implanted when the brush holder 20 is molded with resin.
A piece of resin is sandwiched between the front wall 26 outside the opening and the rear wall 27 inside the opening of the yoke 4 and connects the front wall 26 and the rear wall 27. In the rotating electrical machine which is integrated by the part 28, a resin or rubber having good affinity with both the material for forming the bracket 21 and the material for forming the brush holder 20 is provided between the contact surfaces of the bracket 21 and the brush holder 20. A seal film 76 formed using the above is interposed, and in the interposed state,
It is characterized in that both the contact surface with the bracket 21 and the contact surface with the brush holder 20 are adhered or adhered to each other, and maintain flexibility.

[Effect]

According to the above-mentioned means, since the sealing film is adhered or adhered to both the metal and the resin, a sealed state is established by blocking the gap between them.

In addition, since the seal film is flexible, if a relative displacement occurs between the contact surfaces of the bracket and the brush holder due to the difference in their thermal expansion coefficients, it will follow that displacement. By flexibly deforming the seal, the sealed state can be maintained.

〔Example〕

Fig. 1 is a partially cutaway enlarged side view showing a bracket unit used in a starter motor according to an embodiment of the present invention, Fig. 2 is a vertical sectional view showing the starter motor, and Fig. 4 is an enlarged partial sectional view showing the terminal part, FIG. 5 is an exploded perspective view of the starter motor, FIG. 6 is a longitudinal sectional view showing the process in progress, and FIGS. FIG. 8 is an enlarged partial sectional view for explaining the action, and FIG. 9 is a schematic diagram for explaining the experimental method.

In this embodiment, the rotating electric machine according to the present invention is configured to be used as a starter motor, and includes a stator 1, a rotor 2, and a bracket unit 3 as a composite of metal and resin.

The stator 1 includes a yoke 4 which is integrally formed using a magnetic material by suitable means such as drawing press processing.
The yoke 4 has one end surface (hereinafter referred to as the front side) open and the other end surface (hereinafter referred to as the rear side).
It is formed into a substantially cylindrical shape with a closed area. A flange portion 6 is provided on the outer edge of the opening 5 of the yoke 4 to protrude in the radial direction, and the flange portion 6 has a pair of bolt insertion holes 7 and a pair of screw insertion holes 8 arranged above and below, respectively. It is perforated. A pair of anti-rotation protrusions 9 are disposed on the left and right and protrude from the inner edge of the opening 5 of the yoke 4. A bearing member accommodating portion 10 is formed in a cylindrical shape on the closed wall of the back surface of the yoke 4, and a bearing member 11 is fitted inside this accommodating portion 10. yoke 4
A plurality of magnets 12 are fixed to the inner circumferential surface of the magnet 12 at equal intervals in the circumferential direction so as to form a magnetic field.

The rotor 2 includes a shaft 13 that is longer than the length of the yoke 4, and a commutator 14 and an armature 15 are arranged and fixed on the outer periphery of the intermediate portion of the shaft 13 in front and behind. Shaft 13
A pinion 16 is carved in the front end of the starter, and the pinion 16 is adapted to mesh with a driven gear 17 of the starter in the assembled state. Journal parts 18 and 19 are formed at the rear position and rear end of the pinion 16 on the outer periphery of the shaft 13, respectively, and the shaft 13 has both journal parts 18 and 19 connected to a bearing member 58 and the yoke 4, which will be described later. By being supported by the disposed bearing members 11, the shafts are rotatably mounted inside the yoke 4.

The bracket unit 3 as a composite of metal and resin according to the present invention is equipped with a brush holder 20 as a resin structure integrally molded into a substantially disk shape from nylon resin.
is integrally formed with the bracket 21 as a metal member. Further, a terminal member 33 is implanted at a predetermined position of the brush holder 20 so as to pass through the bracket 21 in an insulating state, as shown in FIG.

Here, the structure of the bracket unit will be clarified by explaining the method of manufacturing the bracket unit.

The bracket 21 is made of a conductive plate material such as an iron plate, and is formed by punching and pressing into a fifth plate so as to correspond to the outer shape of the flange portion 6 of the yoke 4.
It is formed into a flat plate shape as shown in the figure. A pair of bolt insertion holes 22 and screw holes 23 are provided at the upper and lower portions of the bracket 21, respectively. A window hole 24 is formed approximately in the center of the bracket 21 so that the inner diameter is slightly larger than the outer diameter of the commutator 14, and a plurality of small holes 25 are arranged around the window hole 24 in the circumferential direction. It has been established. A bearing member accommodating portion 57 is integrally connected to the window hole 24 in a circular bowl shape. Further, an insertion hole 34 larger than the width and thickness of the terminal member 33 is provided at a position approximately 45 degrees from the upper left corner of the bracket 21.

When the brush holder 20 is molded onto the bracket 21, the bracket 21 is set so as to be sandwiched between the molds 70, as shown in FIG. Although detailed description is omitted, the mold 70 includes an upper mold 71 and a lower mold 72, and a cavity 73 with a gate 74 opened on the mating surfaces thereof.
However, the brush holder 2 has a configuration as described below.
It is embedded in a shape that can form 0. The bracket 21 attaches the brush holder 2 to this cavity 73.
The part to be molded is inserted and set so as to be sandwiched between the upper mold 71 and the lower mold 72.

At the same time, the terminal member 33 is inserted into the insertion hole 34 of the bracket 21 without contacting it, and passes through the cavity 73 to insert the upper mold 71 and the lower mold 7.
Positioned and held at 2.

Here, before the bracket 21 is set in the mold 70, the surface of the portion of the bracket 21 where the brush holder 20 is to be molded is coated with a dye whose main component is an alkyl methacrylate/alkyl acrylate copolymer. Spurgeon is
The coating film 75 is formed by uniformly applying the coating to an appropriate thickness using an appropriate means such as a brush or spray. Further, this coating film 75 is similarly formed on the surface of the insert-molded portion of the terminal member 33, which is another metal member that is inserted into the cavity 73 and molded with resin.

A dispersion whose main component is an alkyl methacrylate/alkyl acrylate copolymer is an example of a resin or rubber liquid product that has good affinity for metals and resins, and is an example of a resin or rubber liquid product that has good affinity for metals and resins. Dispersion or latex may also be used.

Incidentally, in this example, considering that the starter motor will be used in extremely cold regions, the glass transition point of the alkyl methacrylate/alkyl acrylate copolymer is approximately -30°C or lower. The one adjusted as follows is used. In addition, the molding temperature of the resin (approximately 280
℃) is used.

The thickness of the coating film 75 varies depending on the type of resin or rubber used, the type of dispersion or latex medium, emulsifier, etc., the concentration and viscosity of the liquid, etc., but is preferably 1 to 50 μm.
Approximately 10μm is desirable. That is, when the thickness is 1 μm or less, flexibility is difficult to exhibit, and when it is 50 μm, the rate of increase in effectiveness decreases and the cost increases relative to the ratio of usage.

This coating film 75 is dried naturally or forcibly to evaporate water as a dispersion medium. Then, this coating film 75 has rubber-elastic properties or flexibility, and adheres to or sticks to the metal surface. Paint film 7
After the metal members 5 are dried, the bracket 21 and the terminal member 33 as metal members are set in the mold 70 as described above.

When the bracket 21 and the terminal member 33 are appropriately set in the mold 70 in this way,
The cavity 73 is filled with nylon resin as a molding material through the gate 74 in a heated and molten state at about 280°C, and the brush holder 20 as a resin structure made of nylon resin is integrally molded in the bracket 21. At the same time, a terminal member 33 is implanted into the brush holder 20.

That is, the bracket 21 is the brush holder 20
When the brush holder 2 is molded, the part from the inner edge of the window hole 24 to the outside of the small hole 25 is molded so as to be placed substantially perpendicular to the axis of the brush holder 2.
The brush holder 20 is integrated into the brush holder 20 while being sandwiched between the front wall part 26 and the rear wall part 27 of the brush holder 20. In this state, a portion of the nylon resin forming the brush holder 20 is inserted into each small hole 2 of the bracket 21.
5 are filled in to form solid cylindrical portions 28, and these cylindrical portions 28 integrate the bracket 21 and the brush holder 20 in a state where they are completely prevented from rotating. Moreover, when the brush holder 20 is resin-molded, the terminal member 3
3 is fixedly held by a substantially rectangular parallelepiped-shaped holding portion 35 whose insertion hole 34 is filled with resin.

Then, the bracket 21 is attached to the front and rear surfaces of the bracket 21, the front and rear walls 26, 27 of the brush holder 20, the inner periphery of the small hole 25, and the outer periphery of the columnar part 28.
A flexible sealing film 76 is interposed between the contact surfaces of the brush holder 20 and the brush holder 20, and is formed of a coating film 75 whose main component is an alkyl methacrylate/alkyl acrylate copolymer. Since the methacrylic acid alkyl ester/acrylic acid alkyl ester copolymer has a high affinity for metals and resins, this sealing film 76 strongly adheres or adheres to the surfaces of the bracket 21 and the brush holder 20, or is physically or chemically bonded to the surfaces of the bracket 21 and brush holder 20. It is in a state of being physically connected and integrated. Also,
A sealing film 76 is similarly interposed between the contact surface between the brush holder 20 and the terminal member 33 inserted therein.

A hole is formed at the lower left corner of the front wall 26 of the brush holder 20 at approximately 45 degrees so that the skin of the bracket 21 is exposed. A rear hole 31 is similarly opened at a position corresponding to the front hole in the rear wall 27 of the brush holder 20.
The exposed surface of the bracket 21 at the bottom of the rear hole 31 forms a pigtail connection 32 for connecting a pigtail. Terminal member 3
A portion protruding forward from the holding portion 35 of No. 3 forms a second lead wire connection portion 36, and a portion protruding rearward forms a second pigtail connection portion 37, respectively.

The outer diameter of the rear wall portion 27 of the brush holder 20 is set to be approximately equal to the inner diameter of the opening 5 of the yoke 4, and the axes thereof coincide, so that the outer circumference of the rear wall portion 27 and the yoke The inner periphery of the opening 5 substantially constitutes a male seal-coupling part 38 and a female seal-coupling part 39.
At the left and right positions on the outer edge of the back surface of the rear wall portion 27,
A pair of rising walls 40 are each erected in a direction substantially parallel to the axis, and a detent recess 41 is recessed in the outward facing surface of both rising walls 40 in the shape of connecting a circle to the apex of an inverted triangle. has been done. When the male and female seal coupling parts 38 and 39 are connected, the anti-rotation recesses 9 that protrude from the inner edge of the opening 5 of the yoke 4 fit into the anti-rotation recesses 41, respectively. ing.

A pair of brush accommodating chambers 42 are disposed at upper and lower positions on the back surface of the rear wall portion 27 so as to face each other, and the accommodating chambers 42 are provided with a pair of guide walls protruding parallel to each other and facing each other. 43, it is formed into a hollow, substantially rectangular parallelepiped shape with both end faces in the radial direction and three sides of the back surface open. A pin 44 for forming a caulking portion 44A is provided on the back surface of each guide wall 43, and a pin 44 for forming a caulking portion 44A is provided at the inner side of one of the rising walls 40 for positioning a fall prevention plate to be described later. A pin 45 is provided protrudingly. The opening on the back side of the brush storage chamber 42 is closed by a drop-off prevention plate 46 fixed by each pin while in contact with the back surface of each guide wall 43 .

A pair of brushes 51A and 51B are provided in both storage chambers 42.
The pigtails 52A, 52B are arranged facing inward and slidably inserted in the radial direction, and the pigtails 52A, 52B planted on both the brushes 51A, 51B are inserted into the insertion holes provided at the top and bottom of the fall prevention plate 46. 49 in a slidable manner. The end of the pigtail 52A of the brush 51A disposed on the upper side is connected to the pigtail connection portion 37 of the terminal member 33, and the end of the pigtail 52A of the brush 51B disposed on the lower side is connected to the pigtail connection portion 37 of the terminal member 33.
The terminal is connected to the pigtail connection 32 of the bracket 21.
and are electrically connected to the terminal member 33 and the bracket 21.

A pair of springs 53 are inserted from the outward opening of the accommodation chamber 42 and housed outside the brushes 51A, 51B of the accommodation chamber 42, respectively, and the springs 53 are fixed to the outward opening of the accommodation chamber 42. By applying a reaction force to the cap 54 and urging the brush inward, the brush is pressed against the commutator 14 of the rotor 2.

A substantially cylindrical bearing member accommodating portion 57 is formed in a position corresponding to the window hole 24 of the bracket 21 so as to protrude forward, and a bearing member 58 made of a ball bearing or the like is accurately inserted into this accommodating portion 57. It is fitted and aligned with the axis. The axial center of this accommodating part 57 is set to coincide with the axial center of the male seal joint part 38 formed by the outer periphery of the rear wall part 27 of the brush holder 20. The axis of the bearing member 58 that is housed with its axes aligned is the male seal coupling part 38.
This means that it is aligned with the axis of the

When the bracket unit 3 configured as described above is assembled to the stator 1 and the rotor 2, the brush holder 20 is inserted into the opening 5 of the yoke 4 with male and female markings on the outer and inner circumferential surfaces of both brushes. The seals are coupled by the coupling portions 38 and 39, and their axes are aligned. In this state, the axis of the bearing member 58 is aligned with the male seal coupling part 38 of the brush holder 20, so that the axis of the bearing member 58 is also aligned with the axis of the yoke 4. Therefore, the shaft 13 of the rotor 2 has the journal parts 18 and 19 supported by the bearing member 58 and the bearing member 11 at the rear end of the yoke 4.
is precisely aligned with the stator 1 and rotatably supported.

When the opening 5 of the yoke 4 and the brush holder 20 are coupled together, the anti-rotation protrusion 9 and the recess 41 are aligned and fitted to each other. When both 9 and 41 are fitted, the bolt insertion hole 7 and screw insertion hole 8 in the flange portion 6 of the yoke 4 are aligned with the bolt insertion hole 22 and screw insertion screw hole 23 of the bracket 21, respectively. It turns out. Screw 5
9 is inserted into the insertion hole 8 of the flange portion 6 of the yoke 4 and screwed into the screw hole 23, the bracket 21 and the yoke 4 are connected, so that the stator 1 and the rotor 2
The bracket unit 3 is then combined and integrated at once with their axes and positions aligned. Although a detailed explanation will be omitted, in this three-part state, the boss portion 61 of the engine case 60
The bearing member accommodating portion 57 is fitted into the bearing member accommodating portion 57 . If the axes of the boss portion 61 of the engine case 60 and the bearing member accommodating portion 57 are set to coincide with each other, the shaft 13 supported by the bearing member 58 of the bearing member accommodating portion 57 will be aligned with the boss portion 61. The axis will be aligned. Therefore, the pinion 16 carved in the shaft 13 meshes accurately with the driven gear 17.

Next, the action will be explained.

As mentioned above, since the starter motor is connected to the engine case, it is expected that it will be exposed to temperature environments ranging from extremely cold atmospheric temperatures to engine overheating temperatures. Therefore, starter motors are subjected to environmental tests including several dozen thermal shock tests in the range of approximately -20°C to 150°C.

By the way, if a bracket unit without a seal film interposed between the contact surface between the bracket and the brush holder is used in a starter motor, when a thermal shock test is conducted, the difference in thermal expansion coefficient between metal and resin will be determined. As a result, as shown in FIG. 7, a relative displacement 77 occurs between the contact surfaces of the bracket 21' and the brush holder 20', resulting in a decrease in the airtightness of the motor housing in the subsequent airtightness test. This was revealed by the present inventor. This is because a minute gap 77 is generated due to the relative misalignment between the contact surfaces of the bracket 21' and the brush holder 20', and this gap creates an unexpected ventilation path that cannot be controlled, as shown by the arrow in FIG. This is thought to be due to the fact that it is formed as shown in the figure. If such a relative misalignment occurs between the contact surfaces of the bracket and the brush holder, rainwater, condensed water, etc. from the outside will enter the inside of the motor housing, resulting in a loss of motor performance.

However, in this embodiment, the bracket 21
A sealing film 76 is provided between the contact surfaces of the brush holder 20 and the brush holder 20.
Because of the interposition, the intended airtightness of the motor housing is maintained even after the thermal shock test has been carried out. Therefore,
Rainwater, condensed water, etc. from the outside are prevented from entering the housing between the contact surfaces of the bracket 20 and the brush holder 21.

In other words, in the thermal shock test,
Bracket 2 due to the difference in thermal expansion coefficient between metal and resin.
Even if a relative misalignment occurs between the contact surfaces of the brush holder 1 and the brush holder 20, the seal film 76 has excellent affinity for both metals and resins, The brush holder 21 and the brush holder 20 are bonded or adhered to each other. Moreover, the seal film 7
6 has excellent flexibility, so the bracket 21
The displacement between the sealing film 76 and the brush holder 20 due to the difference in their thermal expansion coefficients is allowed by being flexibly deformed, and the integrity of the sealing film 76 itself is maintained.
Therefore, the bracket 21 and the brush holder 20
Even if a relative displacement occurs between the contact surfaces 21 and 20, the sealing film 76 prevents the formation of a gap or a ventilation path between the motor housing 21 and 20. The desired airtightness can be maintained even after the test.

Table 1 included at the end of this specification:
This shows the experimental results regarding this airtightness.
The experiment was conducted as follows.

First, an experimental sample consisting of a bracket unit assembled to a yoke was heated from -20°C to 150°C for about 20°C.
Cooling and heating are repeated more than 10 times at intervals of time.

As shown in Figure 9, this thermal
In the experimental sample 78 subjected to the shock test, a compressor 79 is fluidly coupled via a hose 80 to an airtight chamber formed inside by the bracket unit and yoke, and a pressure gauge 81 is connected to the airtight chamber. Attached so that internal pressure can be measured.

In this set state, the experimental sample 78 is immersed in water in the water tank 82, and air is forced into the airtight chamber by the compressor 79. Then, the bracket 21 and the brush holder 20 in the bracket unit
The pressure gauge 81 measures the internal pressure of the airtight chamber when bubbles 83 are generated between the contact surfaces.
This measured value is the pressure value in Table 1, and its unit is Kg/cm ² . Incidentally, if the experimental value is 0.3 kg/cm ² or more, the water intrusion phenomenon from the contact surface between the bracket and the brush holder can be sufficiently withstood in practical use.

In Table 1, the first sample shows the case where a bracket unit in which no sealing film is interposed between the bracket and the brush holder is used, and the second and subsequent samples show the case where the sealing film is shown in Table 2. The case is shown in which each of the liquid resins or rubbers listed in 1. is applied and formed in the following manner. That is, the liquid material is applied to the surface of the bracket three times using a brush to form a thickness of about 10 to 20 .mu.m, and left to dry for several hours to form a coating film. Thereafter, the brush holder 20 is molded using nylon resin so as to surround the coating film, and a sealing film 76 is interposed between the bracket 21 and the brush holder 20.

FIG. 10 is an enlarged partial sectional view showing a second embodiment of the present invention.

This embodiment differs from the first embodiment in that an annular groove 84 is disposed in the rear end surface of the bracket 21 so as to surround the window hole 24, and is recessed therein in a circular annular shape.

In this embodiment, when the dispersion of alkyl methacrylate/alkyl acrylate copolymer is applied to the bracket 21, the dispersion accumulates in the annular groove 84, so that Seal membrane 7
6 will be formed thickly. Therefore, when the resin of the brush holder 20 expands and contracts in the radial direction,
Since the thickened seal film 7 is pressed against the outer circumferential surface and inner circumferential surface of the annular groove 84 at its contact surface,
The sealing performance of the seal membrane 76 is ensured and further improved.

In Table 1, this second example is shown as sample 9, and the seal membrane is constructed similarly to the second sample.

FIG. 11 is an enlarged partial sectional view showing a third embodiment of the present invention.

This embodiment differs from the first embodiment in that, in addition to the sealing film 76, a layer 85 made of a plastic impregnation agent is formed on the contact surface between the bracket 21 and the brush holder 20. be. As the impregnating agent, those shown in Table 3 are used, and as the impregnating method, the following method is used.

After the bracket unit with the seal film formed is evacuated in a vacuum tank, it is immersed in an impregnating agent solution.
Furthermore, it is evacuated again and then impregnated under pressure.

Note that the impregnating agent and the impregnating method are merely examples, and other impregnating agents include, for example, water glass.

According to this embodiment, even if the sealing film 76 is formed non-uniformly, the sealing performance is reliably maintained because it is sealed by the impregnating agent layer 85.

In Table 1, this third example is shown as sample 10, and the seal membrane is constructed similarly to the second sample.

FIG. 12 is an enlarged partial sectional view showing a fourth embodiment of the present invention.

This embodiment differs from the first embodiment in that a rubber bush 86 is arranged and fixed to the inner periphery of the window hole 24 in the bracket unit 3 so as to cover the boundary line between the bracket 20 and the brush holder 21. It is in the point where it is.

According to this embodiment, in addition to the sealing of the sealing film 76, the boundary line between the bracket 20 and the brush holder 21 at the inner periphery of the window hole 24, which is the source of leakage,
Since it is sealed by the rubber bush 86, the sealing performance is further improved.

In Table 1, this fourth example is shown as the 11th sample, and the seal membrane is constructed similarly to the second sample.

FIG. 13 is a longitudinal sectional view showing a fifth embodiment of the present invention.

This embodiment differs from the first embodiment in that a ventilation passage 87 is provided on the inner circumferential surface of the bearing member accommodating portion 57 of the bracket 20, and a part of the inner circumferential surface of the bearing member 58 is connected to the inside and outside of the bearing member 58. It is formed by recessing it in the axial direction.

As described in the first embodiment, the sealing film 7
In the bracket unit 3 in which the brush holder 6 is interposed, the sealing state between the contact surfaces between the bracket 21 and the brush holder 20 is reliably maintained.
Rainwater, condensed water, etc. from outside the motor are prevented from entering from this location.

In this embodiment, since the ventilation path 87 is opened inside the engine case 60, rainwater or condensed water outside the motor does not enter the inside of the housing. Therefore, the phenomenon of deterioration of motor performance due to water intrusion is completely avoided. and,
Since the housing, which is made airtight by the bracket unit 3 and the yoke 4, is communicated with the outside through the air passage 87, it is completely prevented from getting into the housing by water, and the internal pressure changes in response to the atmosphere, which is the so-called breathing effect, can be ensured. become.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and may be modified without departing from the gist thereof.
It goes without saying that various changes are possible.

For example, the bracket is not limited to being constructed using iron-based materials, but may also be constructed using other metal materials, and the brush holder is not limited to being constructed using nylon resin, but may be constructed using other resins. may be configured.

Although the above embodiments have been described with reference to the case where the present invention is applied to a starter motor, the present invention is not limited thereto, and can be applied to all rotating electric machines such as other motors and generators. In particular, excellent effects can be obtained when applied to products that require liquid-tightness or airtightness.

〔Effect of the invention〕

As explained above, according to the present invention, a flexible sealing film made of resin or rubber that has good affinity for metals and resins is interposed between the contact surfaces of the bracket and the brush holder. By doing so, even if a relative displacement occurs between the contact surfaces of the bracket and the brush holder, a sealed state can be maintained.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway enlarged side view showing a bracket unit which is an embodiment of the present invention, Fig. 2 is a vertical cross-sectional view showing a starter motor in which it is used, and Fig. 3 is the same as that shown in Fig. 2. 4 is an enlarged partial sectional view showing the terminal section, and 5 is a sectional view taken along the line.
The figure is an exploded perspective view of the starter motor, Figure 6 is a vertical sectional view showing the process in progress, Figures 7 and 8 are enlarged partial sectional views to explain the operation, and Figure 9 explains the experimental method. FIG. 1st
FIG. 0 is an enlarged partial cross-sectional view showing a second embodiment of the present invention, FIG. 11 is an enlarged partial cross-sectional view showing a third embodiment of the present invention, and FIG. 12 is an enlarged partial cross-sectional view showing a fourth embodiment of the present invention. 13 is a vertical cross-sectional view showing a fourth embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Stator, 2... Rotor, 3... Bracket unit, 4... Yoke, 5... Opening, 6...
... Flange portion, 7 ... Bolt insertion hole, 8 ... Screw insertion hole, 9 ... Anti-rotation convex portion, 10 ... Bearing member accommodating section, 11 ... Bearing member, 12 ... Magnet, 13 ... Shaft, 14... Commutator, 15... Armature, 16... Pinion,
17... Driven gear, 18, 19... Journal part, 20... Brush holder, 21... Bracket, 22... Bolt insertion hole, 23... Screw hole, 24... Window hole, 25... Small hole, 26...
Front wall part, 27... Wall part, 28... Cylindrical part, 31...
...Back hole part, 32...Pigtail connection part, 33...
...Terminal member, 34...Terminal member insertion hole, 35...Terminal member holding part, 36...Lead wire connection part, 37...Pigtail connection part, 38
... Male seal joint part, 39 ... Female seal joint part, 40
...Rising wall, 41... Rotating recess, 42
...Brush storage chamber, 43...Guide wall, 44...
Pin, 44A... Locking part, 45... Positioning pin, 46... Fall prevention plate, 47... Covering part, 48
...Connection part, 49...Pigtail insertion hole, 50...
...Small hole, 51A, 51B...Brush, 52A, 5
2B...Pigtail, 53...Spring, 54
...Cap, 55, 56...Engagement convex portion, 57...
...Bearing member housing portion, 58...Bearing member, 59...
Screw, 60...Engine case, 61...Boss part, 62...Screw hole for screwing in bolt, 63...Bolt, 70...Mold, 71...Upper die, 72...Lower die, 73... Cavity, 74...Gate, 7
5... Paint film, 76... Seal film, 77... Gap,
78... Experimental sample, 79... Compressor, 80
... Hose, 81 ... Pressure gauge, 82 ... Water tank, 8
3... Air bubble, 84... Annular groove, 85... Plastic impregnating agent layer, 86... Rubber bush, 87...
ventilation path.

【table】

【table】

【table】

【table】

[Table] Chlorinated solvents easily soluble

Claims (1)

[Scope of Claims] 1. A rotating electric machine in which a resin-molded brush holder 20 is fixed to a bracket 21, and this bracket 21 is abutted on an opening of a yoke 4, and the bracket 21 is made of a metal material. The bracket 21 is formed into a thin plate shape by using a brush holder 20, and the bracket 21 is implanted into the brush holder 20 when the brush holder 20 is molded with the resin.
A piece of resin is sandwiched between the front wall 26 outside the opening and the rear wall 27 inside the opening of the yoke 4 and connects the front wall 26 and the rear wall 27. In the rotating electrical machine which is integrated by the part 28, a resin or rubber having good affinity with both the material for forming the bracket 21 and the material for forming the brush holder 20 is provided between the contact surfaces of the bracket 21 and the brush holder 20. A seal film 76 formed using the above is interposed, and in the interposed state,
A rotating electric machine characterized in that both of the contact surface with the bracket 21 and the contact surface with the brush holder 20 are adhered or adhered to each other, and maintain flexibility. . 2. The sealing film 76 is constructed by using a dispersion whose main component is a copolymer of alkyl methacrylate and alkyl acrylate. Rotating electric machine. 3. The rotating electrical machine according to claim 2, wherein the bracket 21 is made of iron-based material and the brush holder 20 is made of nylon resin. 4. A rotating electric machine in which a resin-molded brush holder 20 is fixed to a bracket 21, and this bracket 21 is brought into contact with an opening of a yoke 4, and the bracket 21 is made of a metal material and has a thin plate shape. In addition, this bracket 21 is implanted into the brush holder 20 during resin molding, and the bracket 21 is attached to the brush holder 20 with its yoke 4.
A piece of resin is sandwiched between the front wall 26 outside the opening and the rear wall 27 inside the opening of the yoke 4 and connects the front wall 26 and the rear wall 27. In the rotating electrical machine which is integrated by the part 28, a resin or rubber having good affinity with both the material for forming the bracket 21 and the material for forming the brush holder 20 is provided between the contact surfaces of the bracket 21 and the brush holder 20. A seal film 76 formed using the above is interposed, and in the interposed state,
Both of the contact surface with the bracket 21 and the contact surface with the brush holder 20 are in a state of adhesion or adhesion, and maintain flexibility; Brush holder 2
1. A rotating electric machine characterized in that an annular groove 84 is recessed in the contact surface with the rotary electric machine 0, and the seal film 76 is formed thickly in the annular groove 84. 5. A rotating electric machine in which a resin-molded brush holder 20 is fixed to a bracket 21, and this bracket 21 is abutted on an opening of a yoke 4, and the bracket 21 is made of a metal material and has a thin plate shape. In addition, this bracket 21 is implanted into the brush holder 20 during resin molding, and the bracket 21 is attached to the brush holder 20 with its yoke 4.
A piece of resin is sandwiched between the front wall 26 outside the opening and the rear wall 27 inside the opening of the yoke 4 and connects the front wall 26 and the rear wall 27. In the rotating electrical machine which is integrated by the part 28, a resin or rubber having good affinity with both the material for forming the bracket 21 and the material for forming the brush holder 20 is provided between the contact surfaces of the bracket 21 and the brush holder 20. A seal film 76 formed using the above is interposed, and in the interposed state,
Both of the contact surface with the bracket 21 and the contact surface with the brush holder 20 are in a state of adhesion or adhesion, and are in a state of maintaining flexibility, and furthermore, the seal film 76 and brush holder 20
A rotating electric machine characterized in that a plastic impregnating agent layer 85 is formed between the contact surfaces with the plastic impregnating agent layer 85 so as to seal a portion where the sealing film 76 is unevenly formed. 6. A rotating electric machine in which a resin-molded brush holder 20 is fixed to a bracket 21, and this bracket 21 is abutted to an opening of a yoke 4, and the bracket 21 is made of a metal material and has a thin plate shape. In addition, this bracket 21 is implanted into the brush holder 20 during resin molding, and the bracket 21 is attached to the brush holder 20 with its yoke 4.
A piece of resin is sandwiched between the front wall 26 outside the opening and the rear wall 27 inside the opening of the yoke 4 and connects the front wall 26 and the rear wall 27. In the rotating electrical machine which is integrated by the part 28, a resin or rubber having good affinity with both the material for forming the bracket 21 and the material for forming the brush holder 20 is provided between the contact surfaces of the bracket 21 and the brush holder 20. A seal film 76 formed using the above is interposed, and in the interposed state,
Both the contact surface with the bracket 21 and the contact surface with the brush holder 20 are in a state of adhesion or adhesion, and maintain flexibility; A rotating electric machine characterized in that a rubber bush 86 is fixed to the inner circumferential surface of the brush holder 20 so as to cover the boundary line between the contact surface between the bracket 21 and the brush holder 20. 7. A rotating electric machine in which a resin-molded brush holder 20 is fixed to a bracket 21, and this bracket 21 is in contact with an opening of a yoke 4, and the bracket 21 is made of a metal material and has a thin plate shape. In addition, this bracket 21 is implanted into the brush holder 20 during resin molding, and the bracket 21 is attached to the brush holder 20 with its yoke 4.
A piece of resin is sandwiched between the front wall 26 outside the opening and the rear wall 27 inside the opening of the yoke 4 and connects the front wall 26 and the rear wall 27. In the rotating electrical machine which is integrated by the part 28, a resin or rubber having good affinity with both the material for forming the bracket 21 and the material for forming the brush holder 20 is provided between the contact surfaces of the bracket 21 and the brush holder 20. A seal film 76 formed using the above is interposed, and in the interposed state,
Both the contact surface with the bracket 21 and the contact surface with the brush holder 20 are adhered or adhered to each other, and maintain flexibility. Bearing housing section 57
A rotating electrical machine characterized in that a ventilation passage 87 is formed on the inner peripheral surface of the bearing housing part 57 so as to communicate the inside and outside of the bearing housing part 57 with each other.