JPS63198552A - Rotary electric machine - Google Patents

Abstract

PURPOSE:To prevent the deterioration in sealability between the contacting surfaces of a bracket and a brush holder due to their relative displacement by interposing a sealing film having a predetermined flexibility between the contacting surfaces. CONSTITUTION:A bracket unit has a brush holder 20 as a resin structure integrally formed with an approximate disc shape of nylon resin. The holder 20 is integrally formed with a bracket 21 as a metal member. A resin or rubber having high affinity to the metal and the resin is formed between the contacting surfaces of the holder 20 and the bracket 21, and a sealing film 76 having flexibility is interposed therebetween.

Description

[Detailed Description of the Invention] [Field of Industrial Application] 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 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 is For example, a composite of a bracket and a brush holder (hereinafter referred to as a "bracket unit") used in rotating electric machines such as a starter motor, etc., in which a part of the bracket has a brush holder. This article relates to a technique that is effective for use with objects that are 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 (see, for example, Japanese Utility Model Application Publication No. 124482/1982). ).

[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, if an environmental test such as a thermal shock test is conducted, the heat between the bracket and the brush holder will be 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. was revealed by the present inventor.

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]

In the rotating electric machine according to the present invention, the bracket unit is formed of resin or rubber that has good affinity for metals and resins, and a flexible sealing film is interposed between the contact surfaces of the bracket and the brush holder. It is characterized by the presence of

[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 membrane is flexible, if a relative displacement occurs between the contact surfaces of the bracket and the brush holder due to the difference in coefficient of thermal expansion, it will not follow the 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.
The figure is a cross-sectional view taken along line I[[-11 of Figure 2, Figure 4 is an enlarged partial cross-sectional view showing the terminal section, Figure 5 is an exploded perspective view of the starter motor, and Figure 6 shows the starter motor in the middle of manufacturing. The longitudinal sectional view, FIGS. 7 and 8 are enlarged partial sectional views 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 that 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).

) is formed into a nearly cylindrical shape with a closed hole.

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 1O is formed in a cylindrical shape on the closed surface wall of the back surface of the yoke 4, and this accommodating portion 10
A bearing member 11 is fitted inside. A plurality of magnets 12 are fixed to the inner peripheral surface of the coke 4 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 yoke 4, and a commutator 14 and an armature 15 are fixedly arranged on the outer periphery of the intermediate portion of the shaft 13 in front and behind. A pinion 16 is carved in the front end of the shaft 13, and the pinion 16 is in the assembled state.
It is designed to mesh with the driven gear 17 of the starter. Journal portions 18 and 19 are formed at the rear position and the 1&end portion of the pinion 16 on the outer periphery of the shaft 13, and the shaft 13
It is rotatably mounted inside the yoke 4 by being supported by a bearing member 58, which will be described later in 8.19, and the bearing member 11 disposed on the yoke 4, respectively.

The bracket unit 3 as a composite of metal and resin according to the present invention includes a brush holder 20 as a resin structure integrally molded into a substantially disk shape from nylon resin, and the brush holder 20 is a bracket as a metal member. 21 is integrally molded. In addition, the brush holder 20
As shown in FIG. 4, a terminal member 33 is implanted at a predetermined position so as to pass through the bracket 21 in an insulated state.

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

The bracket 21 is formed into a flat plate shape as shown in FIG. 5 so as to correspond to the outer shape of the flange portion 6 of the yoke 4 by punching and pressing a conductive material such as an iron plate. ing. A pair of bolt insertion holes 22 and screw holes 23 are provided at the top and bottom of the bracket 21.
and have been established and arranged respectively. Bracket 21
A window hole 24 is opened approximately in the center of the commutator 14 so that its inner diameter is slightly larger than the outside diameter of the commutator 14, and a plurality of small holes 25 are arranged around the window hole 24 in the circumferential direction. has been done. A bearing member accommodating portion 57 is integrally connected to the window hole 24 in a circular bowl shape. Also, bracket 2
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 terminal member 1 .

When the brush holder 20 is molded onto the bracket 21, the bracket 21 is molded into the mold 7, as shown in FIG.
It is set so that it is sandwiched between 0 and 0. Although a detailed description will be omitted, the mold 70 includes an upper mold 71 and a lower mold 72, and a cavity 73 with a gate 74 opened in the mating surface of the mold 70 is a brush holder 20 having a configuration as described below. It is immersed in a shape that can be molded. The part of the bracket 21 where the brush holder 20 is to be molded is inserted into the cavity 73, and the bracket 21 is 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 the terminal member 33 is inserted into the cavity 73.
It passes through and is positioned and held by the upper mold 71 and the lower mold 72.

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 methacrylic acid alkyl ester.
The coating 11!75 is formed by uniformly applying a dispersion containing an acrylic acid alkyl ester copolymer to an appropriate thickness by an appropriate means such as a brush or spray. In addition, 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 mainly composed of a methacrylic acid alkyl ester/acrylic acid alkyl ester 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 dispersion listed later. John or latex may also be used.

Incidentally, in this example, considering that the starter motor is used even 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. Moreover, a material that can withstand the resin molding temperature (approximately 280° C.) is used.

The thickness of coating 11175 depends on the fi of the resin or rubber used.
It varies depending on the type of dispersion or latex medium, emulsifier, etc., the concentration and viscosity of the liquid, etc., but it is preferably 1 to 50 μm, and preferably about 10 μm. If the thickness is 50 μm, the rate of increase in effectiveness decreases and the cost relative to the amount used increases.

This coating film 75 is dried naturally or forcibly to evaporate water as a medium of the dispersion.

And this coating is 1m! 75 has rubber elastic properties or flexibility, and also adheres or sticks to the metal surface. After the coating film 75 is dried, the bracket 21 and the terminal member 33 as metal members are set in the mold 70 as described above.

In this way, the bracket 21 and the terminal member 3
3 is properly placed in the mold 70, the nylon resin as the molding material is placed in the cavity 73 at a temperature of about 280°C.
The brush holder 20 as a resin structure made of nylon resin is integrally molded into the bracket 21, and the terminal member 33 is implanted into the brush holder 20. Ru.

That is, when the brush holder 20 is molded, the bracket 21 is arranged and implanted so as to be substantially perpendicular to the axis, so that the portion from the inner edge of the window hole 24 to the outside of the small hole 25 is attached to the front wall of the brush holder 20. section 26 and rear wall section 27
The brush holder 20 is integrated with the brush holder 20 while being sandwiched between the brush holder 20 and the brush holder 20. In this state, a portion of the nylon resin forming the brush holder 20 is removed from each small hole 2 of the bracket 21.
5 to form solid cylindrical portions 28,
These cylindrical portions 28 allow the bracket 21 and the brush holder 20 to be integrated in a state where they are completely prevented from rotating. Further, when the brush holder 20 is molded with resin, the terminal member 33 is fixedly held by a substantially rectangular parallelepiped-shaped holding part 35 in which the insertion hole 34 is filled with resin.

Then, 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 columnar part 28
A flexible seal 11176 is formed between the contact surface between the bracket 21 and the brush holder 20 on the outer periphery of the brush holder 20 by a coating film 75 mainly composed of 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 they are physically or chemically bonded and integrated. Further, a seal 1 is also provided between the contact surface between the brush holder 20 and the terminal member 33 inserted therein.
11176 is similarly provided.

A hole is provided at the lower left corner of the front wall 26 of the brush holder 20 at approximately 45 degrees so that the bare surface 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, and the exposed surface of the bracket 21 at the bottom of this rear hole 31 is used to connect a pigtail. A pigtail connection 32 is formed. A portion of the terminal member 33 that protrudes forward from the holding portion 35 connects the second lead wire connection portion 36, and a portion that protrudes rearward connects the second lead wire connection portion 36 to the second lead wire connection portion 36.
Pigtail connections 37 are formed 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 with each other.
The outer periphery of the yoke opening 5 and the inner periphery of the yoke opening 5 substantially constitute a male inro coupling part 38 and a female inro 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. The above-mentioned reasonable inro joint part 38.3
9 in the coupled state, the anti-rotation recesses 9 protruding from the inner edge of the opening 5 of the yoke 4 are fitted into both anti-rotation recesses 41, respectively.

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 arranged inwardly and slidably inserted in the re-housing chamber 42, respectively, and the pigtails 52A and 52B planted on both brushes 51A and 51B fall off. They are slidably inserted into insertion holes 49 provided at the top and bottom of the prevention plate 46, respectively.

The end of the pigtail 52A of the brush 51A arranged on the upper side is connected to the pigtail connection part 37 of the terminal member 33, and the end of the pigtail 52'B of the brush 51B arranged on the lower side is connected to the pigtail connection part 32 of the bracket 21. Welded together, the terminal member 33 and the bracket 21
electrically connected to.

A pair of springs 53 are inserted from the outward opening of the storage chamber 42 and housed outside the brushes 51A, 51B of the storage chamber 42, respectively.
The brushes are urged inward by applying a reaction force to the cap 54 fixed to the outward opening of the rotor 2, thereby causing the brushes to come into contact with the commutator 14 of the rotor 2.

A substantially cylindrical bearing member accommodating portion 57 is formed at 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 axis of this accommodation portion 57 is located at a male inro coupling portion 38 formed by the outer periphery of the rear wall portion 27 of the brush holder 20.
Therefore, the axis of the bearing member 58 housed in the housing part 57 with its axis aligned is aligned with the axis of the male inro coupling part 38. become.

When the bracket unit 3 configured as described above is assembled to the stator 1 and the rotor 2, the brush holder 20 is connected to the opening 5 of the yoke 4 by a logical inro connection on the outer and inner circumferential surfaces of both. The parts 38 and 39 are used for inro coupling and axial alignment. In this state, the axis of the bearing member 58 is aligned with the male inro coupling part 38 of the brush holder 20, so that it is also aligned with the axis of the yoke 4. Therefore, the shaft 13 of the rotor 2, whose journal portion 18.19 is supported by the bearing member 58 and the bearing member 11 at the rear end of the yoke 4, is accurately aligned with the axis of the stator l and is rotatable. It will be pivoted.

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.

When the screw 59 is inserted into the insertion hole 8 of the flange portion 6 of the yoke 4 and screwed into the tapped hole 23, the bracket 21 and the yoke 4 are connected.
Therefore, the stator 1, rotor 2, and bracket unit 3 are combined and integrated at once with their axes and positions aligned. Although a detailed explanation will be omitted, in this state of one king, the engine case 6
The bearing member accommodating portion 57 is fitted into the boss portion 61 of 0. 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 formed on the shaft 13 meshes accurately with the driven gear 17.

Next, the effect 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, for starter motors,
Environmental tests, including dozens of thermal shock tests, will be conducted at temperatures around ℃.

By the way, when a bracket unit without a seal film interposed between the contact surface of the bracket and the brush holder is used in a starter motor, when a thermal shock test is conducted, the difference in the coefficient of thermal expansion between the metal and the resin will be detected. 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°, which reduces the airtightness of the motor housing in the subsequent airtightness test. This was revealed by the present inventor. This includes the bracket 21' and the brush holder 20.
It is thought that this is because a minute gap 77 is generated due to the relative misalignment between the contact surfaces with ', and this gap creates an unexpected ventilation path that cannot be controlled as shown by the arrow in Figure 7. It will be done. 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, causing deterioration in the performance of the motor.

However, in this embodiment, since the sealing film 76 is interposed between the contact surfaces of the platen 21 and the brush holder 20, the airtightness of the motor housing remains unchanged even after the thermal seal test is conducted. Maintained as intended. Therefore, the bracket 20 and the brush holder 21
External rainwater, condensed water, etc. are prevented from entering the interior of the housing between the contact surfaces with the housing.

That is, in the thermal shock test, even if a relative shift occurs between the contact surfaces of the bracket 21 and the brush holder 20 due to the difference in thermal expansion coefficient between the metal and the resin,
Since the sealing film 76 has excellent affinity for both metals and resins, it adheres to both the bracket 21 and the brush holder 20, as shown in FIG. Moreover, the seal film 7
6 has excellent flexibility, it allows displacement between the bracket 21 and the brush holder 20 due to the difference in coefficient of thermal expansion by flexibly deforming the bracket 21 and the brush holder 20, and the seal I! This will maintain the integrity of 176 itself.

Therefore, even if a relative shift occurs between the contact surfaces of the bracket 21 and the brush holder 20, both 21 and 2
Since the sealing film 76 prevents the formation of a gap or a ventilation path between the motor housing and the thermal shock test, the motor housing can maintain the desired airtightness even after the thermal shock test.

Table 1 included at the end of this specification shows the results of experiments regarding this airtightness, and the experiments were conducted as follows.

First, an experimental sample consisting of a bracket unit assembled to a yoke is repeatedly cooled and heated from -20°C to 150°C at intervals of about 2 hours 10 times or more.

As shown in FIG. 9, in the experimental sample 78 that was subjected to this thermal shock test, a compressor 79 is configured to supply fluid through a hose 80 or the like to an airtight chamber formed inside by a bracket unit and a yoke. At the same time, a pressure gauge 81 is attached to measure the internal pressure of the airtight chamber.

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 pressure gauge 81 measures the internal pressure value of the airtight chamber when bubbles 83 are generated between the contact surfaces of the bracket 2J and the brush holder 20 in the bracket unit.

This measured value is the pressure value in Table 1, and its units are kg/cd. Incidentally, if the experimental value is 0.3 kg/- or more, the phenomenon of water seepage between the contact surface between the bracket and the brush holder can be sufficiently withstood for practical use.

In Table 1, the first sample shows a case where a bracket unit in which a seal film is not interposed between the bracket and the brush holder is used, and the second sample and subsequent samples show the case where the seal film is not interposed between the bracket and the brush holder. 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, and the thickness is approximately 10 to 20 μm.
It is then 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. 1O is an enlarged partial sectional view showing a second embodiment of the present invention.

The difference between this embodiment and the first embodiment is that the bracket 2
1, an annular ring 184 is disposed so as to surround the window hole 24 and is recessed in a circular annular shape.

In this embodiment, when a dispersion of a methacrylic acid alkyl ester/acrylic acid alkyl ester co-electric compound is applied to the bracket 21, the dispersion accumulates in the annular a84, so a sealing film is formed at the annular 1R84. 76 is formed thick.

Therefore, when the resin of the brush holder 20 expands and contracts in the radial direction, the thickened seal 197 is pressed against the outer circumferential surface and the inner circumferential surface of the annular groove 84 at its contact surface, so that the sealing performance of the seal membrane 76 is ensured. At the same time, -N is increased.

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.

The difference between this embodiment and the first embodiment is that the bracket 2
1 and the brush holder 20, in addition to the sealing film 76, a layer 85 made of a plastic impregnation agent is formed by digestion. 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 on which the sealing film has been formed is evacuated in a vacuum tank, it is immersed in an impregnating agent liquid, and further evacuated again, and then impregnated under pressure.

Note that the impregnating agent and the impregnating method are merely examples, and examples of the impregnating agent include water glass.

According to this embodiment, even if the seal film 76 is formed non-uniformly, it will be sealed by the impregnating agent layer 85.
The sealing performance will be maintained by boron.

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. The point is that

According to this embodiment, in addition to the sealing of the seal membrane 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, is sealed by the rubber bushing 86, so that the sealing performance is improved. It is further enhanced.

In Table 1, this fourth example is shown as the eleventh 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.

The difference between this embodiment and the first embodiment is that the bracket 2
A ventilation passage 87 is formed on the inner peripheral surface of the bearing member accommodating portion 57 at 0 by recessing a part of the inner peripheral surface in the axial direction so as to communicate between the inside and outside of the bearing member 5B. At the point.

As described in the first embodiment, in the bracket unit 3 in which the seal 19176 is provided, the sealing state between the contact surfaces of the bracket 21 and the brush holder 20 is reliably maintained, so that rainwater outside the motor This prevents condensed water, water, etc. from entering from this location.

In this embodiment, the ventilation passage 87 is connected to the engine case 60.
Because the opening is inside the housing, rainwater or condensed water from outside the motor will not enter the inside of the housing.
The phenomenon of motor performance deterioration due to water intrusion is completely avoided. The housing, which is made airtight by the bracket unit 3 and the yoke 4, is connected to this air passage 87.
Since it is communicated with the outside by the pipe, it is completely prevented from flooding, and the internal pressure changes in response to the atmosphere, which is the so-called breathing effect, is ensured.

Note that the present invention is not limited to the above embodiments,
It goes without saying that various modifications can be made as long as the gist is not obscured.

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 a case where the present invention is applicable to a starter motor, the present invention is not limited to this, but 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]

1st t! I is a partially cutaway enlarged side view showing a bracket unit that is an embodiment of the present invention, FIG. 2 is a vertical sectional view showing a starter motor in which it is used, and FIG. 4 is an enlarged partial sectional view showing the terminal portion, 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. 7 and 8. are each enlarged partial sectional view for explaining the action, No. 9
The figure is a schematic diagram for explaining the experimental method. FIG. 1O is an enlarged partial sectional view showing a second embodiment of the present invention;
FIG. 11 is an enlarged partial sectional view showing a third embodiment of the present invention;
FIG. 12 is an enlarged partial sectional view showing a fourth embodiment of the present invention;
FIG. 13 is a longitudinal sectional view showing a fourth embodiment of the present invention. l... 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 housing portion, 11... Bearing member, 12... Magnet, 13.
...Shaft, 14...Commutator, 15...
Armature, 16... Pinion, 17... Dripungi middle, 18.19... Journal portion, 20... Brush holder, 21... Bracket, 22... Bolt insertion hole, 23... Screw 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 inro coupling part, 39...Female inro coupling part , 40... Standing wall, 41... Anti-rotation recess, 42... Brush storage chamber, 43... Guide wall, 44... Bin, 44A... Locking part, 45... Positioning pin, 46... fall prevention plate, 47... covering part, 48... connecting part, 49... pigtail insertion hole,
50...small hole, 51A. 51B... Brush, 52A, 52B... Pigtail, 53... Spring, 54... Camp, 55.
56... Engaging convex portion, 57... Bearing member housing portion, 58
... Bearing member, 59 ... Screw, 60 ... Engine case, 61 ... Boss part, 62 ... Bolt screw hole, 63 ... Bolt, 70 ... Molding mold , 71...
・Upper mold, 72...Lower mold, 73...Cavity, 7
4... Gate, 75... Paint film, 76... Seal film, 77... Gap, 78... Experiment sample, 79... Compressor, 80... Hose, 81... Pressure Total, 8
2... Water tank, 83... Bubbles, 84... Annular groove, 8
5...Plastic impregnating agent layer, 86...Rubber bushing, 87...Vent passage. Agent Patent Attorney vi Tatsuya Kei Table 1 Table 3 Ingredients - Methacrylic acid ester pH (1%) 6.0 (2
5℃ pH meter) Surface tension 33 dyne/
cm (25℃ Thunoy method) Shrinkage rate 7%
(Diradometer) Soluble Water Soluble Soluble Alcohol Easy Soluble Chlorine Solvent Easy Melt Figure 1 Figure 2 Figure 6, fn6') Figure 10 Figure 12 Figure 11 Figure 13

Claims (7)

[Claims] (1) In a rotating electrical machine in which a brush holder is integrally molded using resin on a bracket formed into a thin plate shape, and this bracket is attached to an opening of a yoke, contact between the bracket and the brush holder 1. A rotating electric machine, characterized in that a flexible sealing film is interposed between surfaces of the resin or rubber that has good affinity for metals and resins. (2) The sealing film is constituted by using a dispersion whose main component is a methacrylic acid alkyl ester/acrylic acid alkyl ester copolymer. Rotating electric machine. (3) The rotating electric machine according to claim 2, wherein the bracket is made of iron-based material and the brush holder is made of nylon resin. (4) In a rotating electric machine in which a brush holder is integrally molded using resin on a bracket formed into a thin plate shape, and this bracket is abutted on an opening of a yoke, contact between the bracket and the brush holder A flexible sealing film made of resin or rubber that has good affinity for metals and resins is interposed between the surfaces, and an annular groove is sunk in the contact surface of the bracket. A rotating electric machine characterized in that the seal film is formed thickly in the annular groove. (5) In a rotating electrical machine in which a brush holder is integrally molded using resin on a bracket formed into a thin plate shape, and this bracket is abutted on an opening of a yoke, contact between the bracket and the brush holder A flexible sealing film made of resin or rubber that has good affinity for metals and resins is interposed between the contact surfaces, and a plastic impregnating agent layer is formed between the contact surfaces. A rotating electrical machine featuring: (6) In a rotating electric machine in which a brush holder is integrally molded using resin on a bracket formed in a thin plate shape, and this bracket is abutted on an opening of a yoke, contact between the bracket and the brush holder A flexible sealing film made of resin or rubber that has good affinity for metal and resin is interposed between the surfaces, and a rubber bush is provided on the inner peripheral surface of the bracket at the boundary of the contact surface. A rotating electric machine characterized by wires that are fixed in a way that makes them visible. (7) In a rotating electric machine in which a brush holder is integrally molded using resin on a bracket formed in a thin plate shape, and this bracket is abutted on an opening of a yoke, contact between the bracket and the brush holder A flexible sealing film made of resin or rubber that has good affinity for metals and resins is interposed between the faces, and ventilation passages are provided on the inner peripheral surface of the bracket on the sides of both end faces of the bracket. A rotating electrical machine characterized by being formed so that spaces communicate with each other.