JP3181182B2 - Brush device for electric rotating machine and vacuum cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush device used in a rotating electric machine such as a universal commutator motor which can be used for both AC and DC, a DC commutator motor which can be used only for DC, and a generator. , And relates to a vacuum cleaner having an electric blower having the brush device,
The present invention relates to a brush device for a rotating electric machine and a vacuum cleaner having a protective measure when a brush of the rotating electric machine is abnormally overheated by a spark.

[0002]

2. Description of the Related Art In a motor provided with a commutator, a spark is generated between its rotor and a brush. This spark is abnormally generated when, for example, even one armature coil is disconnected. In order to prevent an abnormal decrease in the brush life due to the heat of the spark, the temperature of the brush holder is detected by a temperature sensor, and the detection signal is processed by a signal processing circuit. The technology for stopping the rotation of the electric motor when it becomes
It is known from 193147.

In addition, in order to prevent abrasion due to excessive temperature rise of the brush and to prevent burnout of the motor, the temperature of the brush or the brush holder is detected by using a temperature sensor, and the temperature of the motor is determined based on the temperature. Japanese Patent Application Laid-Open Nos. 6-14501 and 2
-26253, JP-B-61-48359,
And JP-A-51-129601.

Further, in order to prevent the brush from being worn during the cooling operation or to prevent the brush from being worn due to an excessive temperature rise, a heat responsive element made of a shape memory alloy is used and the operation of the element is performed by the operation of the element. A technique for bringing a brush and a commutator into a non-contact state when a situation occurs is disclosed in Japanese Patent Application Laid-Open No. 5-300705.
And JP-A-2-177282.

[0005]

These various techniques are effective as protection measures for the electric motor.

[0006] However, the above-mentioned various techniques for protecting the electric motor using the temperature sensor require a signal processing circuit in addition to the temperature sensor. Since this circuit is configured by combining a large number of circuit components, there is a problem that the number of components as a whole of the protection device is large and the cost is high. In addition, the operation reliability of the signal processing circuit decreases in accordance with the number of the circuit components, and in addition, there is a problem that it is difficult to provide a high-quality one because of the variation of the temperature sensor itself. Furthermore, since the temperature sensor has an insulating layer of glass or ceramics and has a considerable heat capacity, it is disadvantageous in protecting the motor by quickly following the rapid temperature rise of the brush due to the occurrence of abnormal spark. There is also a problem.

[0007] Further, in the technique using a heat-responsive element made of a shape memory alloy instead of a temperature sensor, there is a problem that the cost is high because the shape memory alloy itself is a considerably expensive material. In addition, since the heat responsive element has a considerable heat capacity, there is a problem that it is disadvantageous in protecting the motor by quickly following the rapid temperature rise of the brush due to the occurrence of abnormal spark.

[0008] A first object of the present invention is to provide a commutator motor with high reliability which can protect the commutator motor against abnormal overheating of the brush due to sparks between the commutator and the brush, and which is inexpensive. An object of the present invention is to provide a brush device for a rotating electric machine.

A second object of the present invention is to provide a vacuum cleaner having a high safety without a risk of burning even when an abnormal spark occurs in the commutator motor of the electric blower.

[0010]

According to a first aspect of the present invention, there is provided a brush machine for a rotating electrical machine according to the first aspect of the present invention, wherein a brush is attached to a cylindrical brush holder fixed to a holder insulation by a spring. In a brush device for a rotating electric machine provided with a brush which is urged and elastically pressed against a commutator, the brush holder is formed of an electric conductor, and the brush holder and the brush are electrically connected to each other via conductive means. In the vicinity of the brush holder, there is provided a terminal fitting that is used as a switch contact piece together with the brush holder and is electrically connected to a current path flowing through the armature, and the terminal fitting and the brush holder are maintained at a predetermined temperature. A protection switch means having a conductor which is electrically connected below and which melts and cuts off the electrical connection at a predetermined temperature or higher is provided on the tip side of the brush holder.
To provided, it is characterized in that electrically connects the field coils of the stator of the rotary electric machine and the brush through the switch means and the conducting means.

[0011]

[0012] The To enable fast protection operation in order to achieve the first object, the rotary electric machine brush device of the invention according to claim 2, said protection switch means, the brush holder, the holder The brush is formed of the terminal fittings provided in a non-contact manner with the brush holder and the terminal fittings, and the conductor is provided across the brush holders and the terminal fittings.

[0013] In order to makes it ensure irreversible operation of the protection switch means in order to achieve the first object, claim
The brush device for a rotating electrical machine according to the invention according to claim 3 , wherein the terminal fitting is provided so as to extend in a longitudinal direction of the brush holder, and the terminal fitting is covered with the brush bolder by avoiding a portion where the conductor is provided. A plate is interposed between the terminal fitting and the brush holder.

In order to makes ensure irreversible operation of the protection switch means in order to achieve the first object, claim
According to a fourth aspect of the present invention, in the brush device for a rotating electric machine, the protection switch means may be provided with the brush holder and elastically deformed on the holder side so as to be in non-contact with the brush holder, or may be elastically deformed and contact the brush bolder The brush is formed of the terminal fittings provided as described above, and the conductor provided over the brush holder and the terminal fittings by electrically connecting them.

According to a fifth aspect of the present invention, there is provided a brush device for a rotating electrical machine, wherein the brush device is biased by a spring to a commutator in a cylindrical brush holder fixed to holder insulation. the rotating electric machine brush device provided with a brush which is pressed elastically, wherein forming the brush holder electrical conductors, and electrically connecting the brush holder the brush through a conductive means, the tip of the brush holder A protection switch means is provided in the vicinity of the side , and this protection switch means is used as a switch contact piece together with the brush holder and the brush holder, which is elastically deformed on the holder side and is provided in contact with the brush holder. A terminal fitting connected to a current path flowing through the armature, and a fitting contact portion for holding the terminal fitting against an outer surface of the brush holder; A metal holder provided between the brush holder and the metal holder, and at least the metal contact part is thermally deformed at a predetermined temperature and softened to form a metal holder for restoring the terminal metal. Wherein the field coil of the stator of the rotating electric machine and the brush are electrically connected via the.

[0016] In order to be quickly cope with the temperature rise of the brushes in order to achieve the first object, according
Item 6 is a brush device for a rotating electrical machine according to the present invention, wherein the protection switch means is provided on a side where a spark generated between the commutator and the brush is generated.

In order to achieve the first object with higher reliability, a brush device for a rotating electric machine according to the present invention according to claim 7 , wherein the terminal fitting is attached to the holder insulation.

In order to achieve the second object, the present invention provides
An electric vacuum cleaner according to an eighth aspect of the present invention is a vacuum cleaner body having a dust collecting chamber, an electric blower having a commutator motor, built in the cleaner main body and sucking air in the dust collecting chamber, and the commutator motor. Wherein the commutator motor has a cylindrical brush fixed to a holder insulation on a frame containing an armature and a stator. in the holder is urged by a spring becomes attached a brush device having a brush which is pressed resiliently on commutator having said armature, any one of the brush device of claim 7 Is characterized by the following.

[0019]

According to a first aspect of the present invention, there is provided a protection switch comprising a brush holder and a terminal fitting, wherein the brush holder and the terminal fitting have a switch contact piece, and a conductor which disconnects the electrical connection by melting at a predetermined temperature or higher. And the field coil of the stator of the rotating electric machine and the brush are electrically connected together with the conductive means for electrically connecting the brush holder and the brush holder.
At a predetermined temperature or lower, a state equivalent to closing a switch is maintained at a predetermined temperature or lower.Therefore, a commutator is connected to a current path flowing to an armature via a protection switch means electrically connected to each other and a brush. Are electrically connected. Then, when the temperature of the protection switch unit becomes equal to or higher than a predetermined temperature, the conductor is melted to cut off the electrical connection between the brush holder as the switch contact piece and the terminal fitting, so that the switch is opened. Thus, the current is cut off in the brush device, and the operation of the rotating electric machine including the brush device is stopped. In this case, the tip of the brush holder
The end side is the shadow of the spark that occurs between the brush and the commutator.
It is easily affected by temperature and is the first among brush devices
It is a place where it rises, and protection switch means is provided there
To make this means sensitive to the spark
Can be.

[0020]

According to the second aspect of the present invention, since the conductor provided between the brush holder and the terminal metal which is not in contact with the brush holder is formed by solder or the like, its heat capacity is small.
Since the electrical connection between the brush holder and the terminal fitting is maintained by the conductor, in this state, the protection switch means maintains a state equivalent to a closed state. Thus, the commutator is electrically connected to the current path flowing to the armature via the protection switch means and the brush which are electrically connected to each other. Then, the conductor melts when the temperature reaches a predetermined temperature or higher, disconnects the electrical connection between the brush holder and the terminal fitting, and keeps the protection switch means in an open state. Thus, the current is cut off in the brush device, and the operation of the rotating electric machine including the brush device is stopped.

According to the third aspect of the present invention, the electric insulating plate interposed between the brush holder and the terminal fitting is formed of a conductive material melted at a predetermined position such as the tip of the brush holder at a position other than the predetermined position. It hardens between the brush holder and the terminal fittings to prevent them from being electrically connected again.

According to the fourth aspect of the present invention, the terminal fitting of the protection switch means is elastically deformed when electrically connected to the brush holder by a conductor which is melted at a predetermined temperature or higher. Therefore, when the conductor reaches a predetermined temperature or higher and melts, the conductor is restored so as to lose its own elastic deformation, and most of the melted conductor is flipped away from the brush holder. As a result, the current is cut off in the brush device, and the melted conductor is prevented from solidifying again between the brush boulder and the terminal fitting.

In the structure according to claim 5, the brush holder and the terminal fitting are used as switch contact pieces, and the terminal fitting is elastically deformed toward the brush holder and pressed against the outer surface of the holder to hold the electrical connection therebetween. A protection switch means having a contact portion, and having a metal presser for restoring the terminal fitting and disconnecting the electrical connection as the contact portion thermally deforms and softens at a predetermined temperature or higher, comprises a brush holder and a brush. Electrical connection between the field coil and the brush of the stator of the rotating electric machine together with the conductive means for electrically connecting the
At a temperature lower than a predetermined temperature, the metal contact portion of the metal holder provided in the protection switch means elastically deforms the terminal metal at a temperature lower than the predetermined temperature and comes into contact with the brush holder. The state is maintained, and the electrical connection between the brush holder and the terminal fitting is maintained. In this state, the protection switch means keeps a state equivalent to a closed state, so that the protection switch means and the brush electrically connected to each other electrically connect the commutator to a current path flowing through the armature.

Since the metal contact portion is thermally deformed and softened at a predetermined temperature or higher, the function of pressing the terminal metal to the brush holder is lost. As a result, the terminal fitting is restored so as to lose its own elastic deformation, and the protection switch means cuts off the electrical connection between the brush holder as the switch contact piece and the terminal fitting, so that the terminal fitting is opened. Therefore, the current is cut off in the brush device, and the operation of the rotating electric machine including the brush device is stopped.

In the configuration of claim 6 , the effect of spark generated between the brush on the spark generating side and the commutator is most directly affected, and the temperature of the brush device is the fastest in the brush device. Is provided with a protection switch means, so that this means can react more sharply to the spark.

According to the seventh aspect of the present invention, since the terminal fittings are attached to the holder insulation to which the brush holders are attached, it is possible to use the same holder insulation as the reference for the attachment position between the brush holder and the terminal fittings. Thereby, the mutual positional relationship between the brush holder and the terminal fitting can be easily obtained, and there is no need to find another mounting structure for the terminal fitting, so that the structure is simple and the manufacturing is easy.

[0028] In the configuration of claim 8 , the above-mentioned claims 1 to
7 , the protection switch means for maintaining a state equivalent to closing the switch at a predetermined temperature or less by the above-described operation. The electrical connection between the brush holder and the terminal fitting is cut off, so that the switch is opened. Thereby, the current is cut off in the brush device, and the operation of the commutator motor of the electric blower including the brush device is stopped. Thereby,
For example, even if an abnormal spark occurs between the commutator and the brush due to the disconnection of the armature coil of the commutator motor of the electric blower, the brush burns and spreads to the flammable silencer. Can be eliminated.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view showing a partial cross section of the configuration of the electric vacuum cleaner. In FIG. 1, reference numeral 1 denotes a cleaner main body formed by connecting a lower case 1a and an upper case 1b.
On the front upper side of a, a lid 4 that rotates about the pivot 2 and opens and closes a dust collection chamber 3 formed in the front of the cleaner body 1 is attached.

The cleaner body 1 has a caster-like front wheel 5 and a large-diameter rear wheel 6 which are rotatable, and the cleaner body 1 can move through these rolling motions.
The cleaner body 1 is routed through a suction hose (not shown) inserted and connected to a suction opening (not shown) provided at the front end thereof.

In FIG. 1, reference numeral 7 denotes a suction grid which partitions the rear end of the dust collecting chamber 3, and a filter 8 is supported on the front surface. The grid 7 supports a dust bag 9 connected to the suction port from behind via a filter 8. Also, in FIG.
Is an exhaust hole.

An electric blower 11 is accommodated in the cleaner body 1 between the suction grid 7 and the exhaust hole 10. The electric blower 11 includes a fan unit 12 and a commutator motor 13. The fan unit 12 includes a centrifugal fan (not shown) rotated by the commutator motor 13, a fan cover that covers the centrifugal fan, and a rectifier plate that guides the air discharged from the centrifugal fan into the commutator motor 13 while giving a diffuser effect. Be prepared.

The electric blower 11 is supported by the blower supporting walls 14 and 15 of the cleaner body 1 via a first rubber packing 16 in a vibration-isolating manner, and the other members of the cleaner body 1 are also provided. The second rubber packing 1 is attached to the blower support wall 17.
By being supported in a vibration-proof manner via 8, it is built in the cleaner body 1 with its axis horizontal. Note that the arrangement of the electric blower 11 is not limited to a horizontal position. For example, in the case of a pot-type electric vacuum cleaner, the electric blower 11 is built in the main body of the vacuum cleaner with the axis thereof being vertical. The first rubber backing 16 in the form of a ring is disposed so as to fit around the periphery of the fan cover, and the second rubber packing 18 in the form of a cap is disposed so as to be fitted over the rear end of the commutator motor 13. I have. The electric blower 11 sucks air in the dust collection chamber 3 and exhausts the air from the commutator motor 13 to the outside.

A cylindrical silencer 19 surrounding the commutator motor 13 around the commutator motor 13 is housed in the cleaner body 1. The silencer 19 is made of a breathable synthetic resin such as urethane foam and is flammable. The wind flowing out of the electric blower 11 flows through the rear part of the cleaner main body 1 through the silencer 19 and is discharged out of the cleaner main body 1 through the exhaust hole 10.

The configuration of the commutator motor 13 will be described with reference to FIGS. In FIG. 2, reference numeral 21 denotes a substantially cylindrical frame having a bottom, which is provided on the bottom wall thereof so as to protrude from the second rubber packing 18.
A bearing 22 is built in the bearing housing portion 21a in which the bearing 22 is fitted. The fan cover is fitted and attached to the opening edge 21a of the frame 21, and a frame end plate 23 is attached. The end plate 23 is in the form of a strip crossing the opening of the frame 21 in the radial direction, and has a suction opening between both side edges and the opening edge 21b. A bearing 24 is built in a bearing housing portion 23a formed at the center of the frame end plate 23.

The rotating shaft 26 of the armature 25 is supported over the bearings 22 and 24, and the centrifugal fan (not shown) is attached to an end of the shaft 26 that passes through the bearing 24. The armature 25 includes a rotating shaft 26, an armature core 27 fitted and fixed to the shaft 26, an armature coil 28 wound around the core 27, and a fixed commutator 29 fitted to the rotating shaft 26. Armature coil 28
Are connected to a plurality of commutator pieces 29a in which the commutator 29 is juxtaposed on the periphery thereof so as to be insulated from each other.

A plurality of (only one is shown in FIG. 2) outlets 30 are provided in a peripheral portion on the bottom side of the frame 21 and the like. Positioned between the outlet 30 and the opening edge 21b,
A stator 31 is built in the frame 21. This stator 31 has a substantially square outer shape when viewed from a plane,
The four corners are press-fitted into the inner peripheral surface of the frame 21 and provided.
A ventilation gap 32 (only one is shown) is formed between the inner peripheral surface of the frame 21 and the side surface of the stator 31 facing the inner peripheral surface.

At the end of the stator 31 located on the bottom side of the frame 21, a synthetic resin winding holder 33 for electrical insulation is mounted, and a pair (only one of them) formed integrally with the holder 33 is provided. The connection terminal 3 is connected to the terminal block 33a (not shown).
4 are attached. The terminal of the stator coil is electrically connected to the connection terminal 34, and the connection terminal 34 has a flat terminal plate portion extending to approach the inner peripheral surface of the frame 21.

A pair of brush devices 41 are mounted on the peripheral wall of the frame 21 so as to penetrate the frame 21 in the radial direction. As shown in FIGS. 3 to 5, these brush devices 41 include a holder insulator 42, a brush holder 43, and a brush 4.
4, a pigtail 45, a coil spring 46, and protection switch means 47.

More specifically, the holder insulation 42 is made of a thermosetting synthetic resin such as a phenol resin having electric insulation.
It has a holder insulating body 42a penetrating the peripheral wall of the frame 21 and a mounting flange 42b. The mounting flange 42b overlaps the outer peripheral surface of the peripheral wall of the frame 21. The holder insulation 42 is detachably fixed to the frame 21 by penetrating the mounting flange 42b and tightening a screw 48 screwed to the peripheral wall.

The brush holder 43 has a cylindrical shape with one end opened and the other end closed by a bottom wall 43d made of an electric conductor such as a brass or galvanized steel plate or a copper plate. As shown in FIG. 5, the cylindrical portion of the brush holder 43 is formed to have a pair of flat walls 43a and 43b and a curved wall 43c connecting the two walls 43a and 43b, respectively. 43c is used for the lash holder 43.
The temperature of the brush 44 is suppressed by allowing air to pass through the inside. The brush holder 43 is attached to the holder insulating member 42 so as not to move in the axial direction. The bottom wall 43d is disposed outside the frame 21.

As the brush 44, a carbon brush formed by binding carbon powder with a binder made of a synthetic resin binder is used. The brush 44 is provided in the brush holder 43 so as to be movable in the axial direction using the holder 43 as a guide. One end of a pigtail 45 is embedded in the brush 44, and these are electrically connected. The other end of the pigtail 45 is fixed to the bottom wall 43a by spot welding or the like. Thus, the brush holder 43 and the brush 44 are electrically connected via the pick tail 45.

The coil spring 46 is housed in the brush holder 43 with both ends in contact with the brush 44 and the bottom wall 43a. The brush 44 projects from the open end of the brush holder 43 by the spring force of the spring 46. Is being biased. Therefore, when the brush device 41 is in the free state, most of the brush 44 projects from the brush holder 43 as shown in FIG. 4, and when the brush device 41 is fixed to the frame 21, the brush 44 as shown in FIG. Is
It hits the outer peripheral surface of the commutator 29 and is pushed into the brush holder 43, and is pressed and held against the outer peripheral surface.

A terminal mounting hole 4 is formed in the holder insulating body 42a.
9 are provided. The protection switch means 47
Is formed to include a part of the brush holder 43, a terminal fitting 50 disposed near the part, and a conductor 51. The terminal fitting 50 is formed of a spring plate having elasticity, and has a connection portion 50a bent in a substantially rectangular shape. By inserting the connecting portion 50a into the terminal mounting hole 49, the terminal fitting 50 is arranged near the outside of the flat wall 43a.

The connecting portion 50a is elastically in close contact with the inner surfaces of the terminal mounting holes 49 opposing each other up and down, and holds the mounting state of the terminal fitting 50. The flat terminal plate portion of the connection terminal 34 is inserted into the terminal mounting hole 49 along with the above-described mounting of the brush device 41, whereby the connection terminal 3
4, the stator 31 side and the terminal fitting 50 are electrically connected. The commutator motor 13 of the present embodiment is a universal type for both AC and DC.
When the electric motor 13 is a DC commutator motor, the power supply side is electrically connected to the terminal fitting 50. As described above, the terminal fitting 50 is electrically connected to a current path flowing through the armature 25.

The protruding portion of the terminal fitting 50 protruding out of the terminal mounting hole 49 is connected to one flat wall 4 of the brush holder 43.
An insulating gap is provided between the brush holder 43 and the brush holder 43. The insulating gap is arranged substantially in parallel with the flat wall 43a, and its tip extends to reach the tip of the brush holder 43. The flat wall 43a and the protruding tip portion of the terminal fitting 50 are connected via a conductor 51.

The conductor 51 is made of, for example, a solder made of a low melting point metal (this embodiment), or a synthetic resin having a heat-fusing property and a synthetic rubber having conductivity. The conductor 51 made of solder or the like is solidified at a predetermined temperature (for example, 160 ° C.) or lower, and electrically and mechanically connects the brush holder 43 and the terminal fitting 50. The holder 43 and the terminal fitting 50 are provided to disconnect the electrical and mechanical connection.

In the first embodiment, the field coil of the stator 31 of the commutator motor 13 and the brush 44 elastically pressed against the commutator 29 are connected via the protection switch means 47 and the pigtail 45. And are electrically connected. The protection switch means 47 has a configuration in which the terminal fitting 50 of the means 47 and the flat wall 43a which is a part of the brush holder 43 are used as switch contact pieces.

Therefore, when the temperature is lower than the predetermined temperature, the flat wall 43a
The switch contact pieces 43b and 50 are electrically connected to each other while maintaining the solidified state of the conductor 51 provided between the switch and the terminal fitting 50. In other words, when the temperature is equal to or lower than the predetermined temperature, the protection switch unit 47 maintains a state equivalent to a state in which the switch is closed.

Thus, when the commutator motor 13 is energized, the current supplied from the power source is transferred from the commutator 29, whose brush 44 is in sliding contact with the armature coil, via the brush device 41 on the positive electrode side. Then, the current is returned from the commutator 29 to the negative brush device 41, so that the commutator motor 13 is operated.

Since the centrifugal fan rotates with the operation of the commutator motor 13, the blower operation by the electric blower 11 is performed. As a result, dust can be sucked into the cleaner body 1 of the vacuum cleaner, and the wind discharged from the centrifugal fan is
The frame 2 passes through a current plate and a suction opening (not shown).
1, the stator 31 in this frame 21
The air flows through the ventilation gap 32 while air-cooled, and further flows out of the commutator motor 13 through the outlet 30 after the brush device 41 is air-cooled. This wind sound is attenuated by passing through the silencer 19 surrounding the commutator motor 13. The wind exhausted as described above is exhausted through the exhaust hole 10 of the cleaner body 1. Therefore, it is possible to perform the cleaning by the vacuum cleaner under the above-described operation state.

In this operation, the short-circuit current flowing through the brush 44 between the commutator pieces 29a adjacent to the commutator 29 is cut off every time commutation is performed.
And a commutator 29, and a spark is generated between the commutator 29 and the brush 44 or the brush holder 43. By the way, for example, the armature coil 28
However, if even one wire breaks for any reason, the amount of current increases and the current ripple increases markedly, so that the generated spark also abnormally occurs, and naturally, thermal damage to the surrounding parts such as the brush 44 etc. The impact is enormous.

In such a situation, when the temperature of the conductor 51 of the protection switch means 47 becomes higher than a predetermined temperature due to the thermal influence, the conductor 51 is melted accordingly. Flat wall 43 of brush holder 43
The electrical connection between the terminal a and the terminal fitting 50 is cut off, and the protection switch means 47 is in a state in which the switch is opened.

Further, in this case, the tip side of the brush holder 43 is easily affected by spark generated between the brush 44 and the commutator 29, and is a place in the brush device 41 where the temperature rises quickly. Since the conductor 51 of the protection switch means 47 is provided at that location, the conductor 51 can react sharply to the abnormal spark. In addition, since the conductor 51 made of solder has a small heat capacity, the number of parts is small and the structure is simple, but the temperature rise of the brush 44 can be quickly followed. Therefore, the protection switch means 47 can be opened by quickly coping with an abnormal temperature rise of the brush 44.

As described above, when the brush 44 reaches a predetermined temperature or more due to the abnormal spark, the protection switch means 47 quickly cuts off the current in the brush device 41 and stops the further operation of the commutator motor 13. Therefore, the temperature of the brush 44 does not rise abnormally due to the abnormal spark between the commutator 29 and the brush 44.

Accordingly, there is no fear that the synthetic resin component forming the binder of the brush 44 will burn. Therefore, the flame of the brush 44 passes through the outlet 30 and the combustible silencer 19
No more fire spread. In other words, the protection switch means 47 protects the commutator motor 13 and the main body 1 of the cleaner with the protection operation for quickly coping with an abnormal temperature rise of the brush 44, thereby eliminating the risk of burning.

As described above, the protection switch means 47
Since the above-described protection operation is obtained by the brush device 41 having
There is no need for a temperature sensor for obtaining a similar protection operation and a signal processing circuit with a large number of components accompanying the temperature sensor. Moreover,
One of the switch contact pieces of the protection switch means 47 also serves as the brush holder 43. Therefore, the number of parts is small, the structure is simple, the device can be operated with high reliability, and the brush device 41 can be provided at a low cost because a high-cost shape memory alloy is not used to obtain the same protection operation as described above.

In the structure of the brush device 41, a pair of switch contact pieces provided in the protection switch means 47, that is, the brush holder 43 and the terminal fitting 50 are provided.
Are mounted on the same holder insulation 42.
Therefore, since the reference of the mounting position of the brush holder 43 and the terminal fitting 50 is the same, the brush holder 43
And the terminal fitting 50 can easily determine the mutual positional relationship. Therefore, it is possible to quantify the conductor 51 made of solder provided between both switch contact pieces, and
Can be improved with respect to prevention of excessive temperature rise. Moreover,
Since there is no need to find another mounting structure for supporting the terminal fitting 50, the structure is simple and the manufacturing is easy.

FIGS. 6 and 7 show the main parts of a second embodiment of the present invention. The second embodiment differs from the first embodiment only in the configuration of the tip of the brush holder 43 serving also as one of the switch contacts of the protection switch means 47 and the insulating structure between the two switch contacts. Is the same as that of the rotary electric machine brush device and the electric vacuum cleaner according to the first embodiment shown in FIGS. 1 to 5 including the parts not shown in FIGS. 6 and 7. 1 to 5, the same components as those shown in FIG. 1 are denoted by the same reference numerals as those in the first embodiment, and the description of those components and the description of the operation and effect based on them will be omitted. The same part also constitutes a part of the configuration of the present embodiment apparatus and the vacuum cleaner.

The brush holder 43 of the second embodiment has a tongue piece 43a1 which is bent at a right angle at the tip of the flat wall 43a. A conductor 51 made of solder is provided between the tongue piece 43a1 and the tip of the terminal fitting 50.

Further, between the terminal fitting 50 extending in the longitudinal direction of the brush holder 43 and the flat wall 43a,
An electric insulating plate 152 is interposed in a face-to-face contact with these. The width of the insulating plate 152 is wider than the width of the flat wall 43b of the brush holder 43 as shown in FIG. 7, and therefore, the electric insulating plate 152 covers the terminal fitting 50 with respect to the flat wall 43a. The insulating plate 152 is integrally protruded from the holder insulating member 42, for example, but may be formed separately and adhered to the outer surface of the flat wall 43a.

In the second embodiment having such a configuration, the same effect as in the first embodiment can be obtained by providing the protection switch means 47, and the intended object of the present invention can be achieved. In addition, since the lower piece 43a1 is provided, when the conductor 51 is soldered between the lower piece 43a1 and the terminal fitting 50, when working from the upper direction indicated by the arrow in FIG. Without flowing down to the conductor 51
Can be easily installed.

Further, the electric insulating plate 152 interposed between the brush holder 43 and the terminal fitting 50 is provided with a conductive material 5 which is melted at a predetermined position (for example, a position on the tip side of the brush holder 43).
1 can be prevented from flowing and hardening to another position between the brush holder 43 and the terminal fitting 50, thereby preventing the brush holder 43 and the terminal fitting 50 from being electrically connected again. In this way, the irreversible operation of the protection switch means 47 is ensured.
Temperature does not rise abnormally.

FIG. 8 shows a main part of a third embodiment of the present invention. This third embodiment differs from the first embodiment only in the configuration of the terminal fittings of the protection switch means 47, and the other configurations are the same as those shown in FIGS. 1 to 5 including portions not shown in FIG. Since the configuration is the same as that of the rotary electric machine brush device and the vacuum cleaner of the first embodiment, the components not shown are substituted with FIGS. 1 to 5 and the same components shown are the same as those of the first embodiment. With the sign of
Although the description of those components and the description of the operation and effect based on them are omitted, these same parts also constitute a part of the configuration of the apparatus of this embodiment and the vacuum cleaner.

In the third embodiment, the terminal fitting 15 made of a leaf spring is used.
In FIG. 8, the portion of the holder insulation 42 protruding outside from the terminal mounting hole 49 is bent in a free state as shown by a two-dot chain line in FIG. Then, the terminal fitting 150 is elastically deformed so that its protruding portion is parallel to the flat wall 43a of the brush holder 43 as shown by a solid line in FIG. In this state, the conductor 51 made of solder or the like is disposed.
Is mechanically and electrically connected to the flat wall 43a via the.

In the third embodiment having such a configuration, the same effects as in the first embodiment can be obtained by providing the protection switch means 47, and the intended object of the present invention can be achieved.

In addition, the terminal fitting 150 of the protection switch means 47 is elastically deformed when electrically connected to the brush holder 43 by the conductor 51 which is melted at a predetermined temperature or higher. When the conductor 51 is melted after reaching the above, the conductor 51 is rapidly restored so as to lose its own elastic deformation. The conductor 5 melted with this restoring operation
Most of 1 can be flipped away from the flat wall 43a of the brush holder 43.

Thus, a predetermined position (the brush holder 43)
The conductor 51 melted at the tip end of the wire) flows to a position different from the predetermined position between the brush holder 43 and the terminal fitting 150, and is electrically connected to prevent solidification. Since the irreversible operation of the protection switch means 47 can be ensured in this way, the temperature of the brush 44 does not rise abnormally due to abnormal spark.

FIG. 9 shows a main part of a fourth embodiment of the present invention. This fourth embodiment differs from the first embodiment only in the configuration of the terminal fittings of the protection switch means 47, and the other configurations are the same as those shown in FIGS. Since the configuration is the same as that of the rotary electric machine brush device and the vacuum cleaner of the first embodiment, the components not shown are substituted with FIGS. 1 to 5 and the same components shown are the same as those of the first embodiment. With the sign of
Although the description of those components and the description of the operation and effect based on them are omitted, these same parts also constitute a part of the configuration of the apparatus of this embodiment and the vacuum cleaner.

In the fourth embodiment, the terminal fitting 25 made of a leaf spring is used.
In FIG. 9, a portion of the holder insulation 42 that protrudes outside from the terminal mounting hole 49 is parallel to the flat wall 43a in the free state, as shown by a two-dot chain line in FIG. Note that the protruding portion may be bent in a direction away from the flat wall 43a. The terminal fitting 250 has a protruding portion as shown by a solid line in FIG.
3 is elastically deformed so as to be in contact with the flat wall 43a, and in this state, the flat wall 43
a is connected mechanically and electrically.

Also in the fourth embodiment having such a configuration, by providing the protection switch means 47, the same operation as in the first embodiment can be obtained, and the intended object of the present invention can be achieved.

In addition, the terminal fitting 250 of the protection switch means 47 is elastically deformed when electrically connected to the brush holder 43 by the conductor 51 which is melted at a predetermined temperature or higher. When the conductor 51 is melted after reaching the above, the conductor 51 is rapidly restored so as to lose its own elastic deformation. The conductor 5 melted with this restoring operation
Most of 1 can be flipped away from the flat wall 43a of the brush holder 43.

As a result, a predetermined position (the brush holder 43)
The conductor 51 melted at the end portion of the conductive member 51 flows to a position different from the predetermined position between the brush holder 43 and the terminal fitting 250, and is electrically connected to prevent solidification. Since the irreversible operation of the protection switch means 47 can be ensured in this way, the temperature of the brush 44 does not rise abnormally due to abnormal spark.

FIGS. 10 to 12 show a main part of a fifth embodiment of the present invention. In the fifth embodiment, only the connection structure between the terminal fitting 350 and the flat wall 43a in the protection switch means 47 and the constituent material of the holder insulation 142 are the first material.
Unlike the embodiment, the other configuration includes the first part shown in FIGS. 1 to 5 including parts not shown in FIGS.
Since the configuration is the same as that of the rotary electric machine brush device and the vacuum cleaner of the embodiment, the components that are not shown are replaced with those of FIGS. 1 to 5, and the same components that are shown are the same as those of the first embodiment. The description of the components and the description of the operation and effect based on them will be omitted, but these same parts also constitute a part of the configuration of the present embodiment apparatus and the vacuum cleaner.

In the fifth embodiment, the terminal fitting 35 made of a leaf spring is used.
No. 0 has a holder contact portion 351 formed in a substantially T-shape at the distal end as shown in FIG. This contact part 3
In a free state, 51 is bent in a direction away from the flat wall 43a of the brush holder 43 as shown by a two-dot chain line in FIG.

As shown by the solid line in FIG. 10, the holder contact portion 351 is provided in contact with the flat wall 43a in an elastically deformed state, and electrically connects the brush holder 43 and the terminal fitting 350. To realize this connection, the holder insulation 142 is formed of a synthetic resin such as nylon or the like, which is easily softened at a predetermined temperature or higher when heated and thermally deforms. A metal retainer 352 interposed between the flat wall 43a and the terminal metal 350 and also serving as an electric insulating plate is integrally protruded.

The metal holder 352 extends in the longitudinal direction until it reaches the end of the brush holder 43. The end of the holder 352 integrally has a pair of holding parts 352a composed of convex parts having a small heat capacity. ing. As shown in FIG. 12, a projecting portion 351b projecting at a right angle from the elastically deformed neck 351a of the holder contacting portion 351 is sandwiched between the pressing portions 352a and the tip of the flat wall 43a. As shown in FIG. 11, the neck portion 351a is passed between the pair of pressing portions 352a in an elastically deformed state.

In this assembly, at the final stage of inserting the terminal fitting 350 into the terminal mounting hole 49, the holder contact portion 3
51 is inserted by keeping the elastically deformed state so as to be in contact with the flat wall 43a.
Presses the overhang portion 351b against the outer surface of the flat wall 43a to maintain the electrical connection between the brush holder 43 and the terminal fitting 350.

In the configuration of the fifth embodiment, the protection switch means 47 is in a state equivalent to a closed state at a predetermined temperature or lower, and the protection switch means 47, the pigtail 45 and the brush 44 are electrically connected to each other.
The power supply side or the stator side is electrically connected to the rotor.

However, when an abnormal spark occurs between the commutator and the brush 44, the holding portion 352a having a small heat capacity becomes higher than a predetermined temperature due to the rise in the temperature of the tip end of the brush device 41 due to the spark. Then, it is thermally deformed and softened. Therefore, the function of pressing the holder contact portion 351 against the brush holder 43 is lost, and the terminal fitting 3
The 50 holder contact portions 351 are restored in a direction away from the flat wall 43a so as to eliminate their own elastic deformation.

Thus, the protection switch means 47 includes the brush holder 43 as the switch contact piece and the terminal fitting 3.
The electrical connection between the power supply 50 and the power supply 50 is cut off, so that the connection is opened. Therefore, the current is cut off in the brush device 41, the operation of the commutator motor including the brush device 41 is stopped, and the risk of abnormal heat generation of the commutator motor by continuing the operation can be eliminated.

That is, the same effects as in the first embodiment can be obtained, and the intended object of the present invention can be achieved. In addition, since the protection switch means 47 of the fifth embodiment can omit the conductor made of solder or the like used in the first embodiment, the number of components can be reduced, and a simple configuration can be achieved. , Can be provided at low cost.

FIGS. 13 to 15 show the main parts of a sixth embodiment of the present invention. In the sixth embodiment, only the connection structure between the terminal fitting 450 and the flat wall 43a in the protection switch means 47 and the constituent material of the holder insulation 242 are the first material.
Unlike the embodiment, the other configuration includes the first part shown in FIGS. 1 to 5 including parts not shown in FIGS.
Since the configuration is the same as that of the rotary electric machine brush device and the vacuum cleaner of the embodiment, the components that are not shown are replaced with those of FIGS. 1 to 5, and the same components that are shown are the same as those of the first embodiment. The description of the components and the description of the operation and effect based on them will be omitted, but these same parts also constitute a part of the configuration of the present embodiment apparatus and the vacuum cleaner.

In the sixth embodiment, a terminal fitting 45 made of a leaf spring is used.
No. 0 has a holder contact portion 451 formed in a substantially L-shape at the tip end as shown in FIG. This contact part 4
In a free state, 51 is bent in a direction away from the flat wall 43a of the brush holder 43 as shown by a solid line in FIG.

As shown by the solid line in FIG. 15, the holder contact portion 451 is provided in contact with the flat wall 43a in an elastically deformed state, and electrically connects the brush holder 43 and the terminal fitting 450. To realize this connection, the holder insulation 242 is formed of a synthetic resin such as nylon or the like, which is easily softened at a predetermined temperature or higher when heated and undergoes thermal deformation. A metal holding plate 452 interposed between the flat wall 43a and the terminal metal fitting 450 and capable of forming an electric insulating plate is integrally protruded.

The metal holder 452 extends in the longitudinal direction until it reaches the end of the brush holder 43. The end of the holder 452 has a holding part 452a made of a single convex part having a small heat capacity. I have. This convex part 452a
Are provided corresponding to the side where a spark generated between the commutator 29 and the brush 44 is generated, as shown in FIG. The arrow in FIG. 16 indicates the rotation direction of the commutator 29, and therefore, the side B in FIG. 16 is the spark generation side.

As shown in FIG. 14, the holding portion 452a
A holder contact portion 451 is provided between the
A projecting portion 451b projecting at a right angle from the elastically deformed neck 451a is sandwiched.

In this assembly, at the final stage of inserting the terminal fitting 450 into the terminal mounting hole 49, the holder contact portion 45
1 is kept in an elastically deformed state so as to be in contact with the flat wall 43a, and the pressing is performed by inserting the pressing portion 452a against the outer surface of the flat wall 43a. Maintain the electrical connection of

In the configuration of the sixth embodiment, the protection switch means 47 is in a state equivalent to a closed state at a predetermined temperature or lower, and the protection switch means 47, the pigtail 45, and the brush 44 are electrically connected to each other.
The power supply side or the stator side is electrically connected to the commutator.

However, when an abnormal spark is generated between the commutator 29 and the brush 44, the holding portion 452a having a small heat capacity is heated to a predetermined temperature due to the rise in the temperature at the tip end side of the brush device 41 due to the spark. Above, it is thermally deformed and softened. Therefore, the function of pressing the holder contact portion 451 against the brush holder 43 is lost, and the holder contact portion 451 of the terminal fitting 450 is restored in a direction away from the flat wall 43a so as to lose its own elastic deformation.

Thus, the protection switch means 47 includes the brush holder 43 as the switch contact piece and the terminal fitting 4.
The electrical connection between the power supply 50 and the power supply 50 is cut off, so that the connection is opened. Therefore, the current is cut off in the brush device 41, the operation of the commutator motor including the brush device 41 is stopped, and the risk of abnormal heat generation of the commutator motor by continuing the operation can be eliminated.

That is, the same effects as in the first embodiment can be obtained, and the intended object of the present invention can be achieved. In addition, since the protection switch means 47 of the sixth embodiment can omit the conductor made of solder or the like used in the first embodiment, the number of components can be reduced and the configuration can be simplified. , Can be provided at low cost. In addition, the spark generating side on which the pressing portion 452a is arranged is most directly affected by the spark generated between the brush 44 and the commutator 29.
This is the place where the temperature rises the fastest in the brush device 41. Therefore, the desired object of the present invention can be achieved by making the thermal deformation of the holding portion 452a more sensitively react to the abnormal temperature rise due to the occurrence of the abnormal spark.

FIGS. 17 to 19 show the essential parts of a seventh embodiment of the present invention. The seventh embodiment differs from the first embodiment only in the connection structure between the terminal fitting 550 and the flat wall 43a in the protection switch means 47 and the structure of the tip end of the brush holder 43. 17 to FIG.
9 is the same as the rotary machine brush device and the vacuum cleaner of the first embodiment shown in FIGS. 1 to 5 including the parts not shown in FIG.
5, the same components as those shown in FIG. 5 are denoted by the same reference numerals as those in the first embodiment, and the description of those components and the description of the operation and effect based on them will be omitted. The part also constitutes a part of the configuration of the present embodiment apparatus and the vacuum cleaner.

In the seventh embodiment, the terminal fitting 55 made of a leaf spring is used.
In the free state, the leading end of the brush holder 0 is bent away from the flat wall 43a of the brush holder 43 as shown by a two-dot chain line in FIG. The distal end portion is provided in contact with the flat wall 43a in an elastically deformed state, and electrically connects the brush holder 43 and the terminal fitting 550. A fitting retainer 551 is used to realize this connection.

The metal retainer 551 is made of a synthetic resin such as nylon or the like, which is softened at a predetermined temperature or more when heated and easily deformed by heat to form a ring. FIG. 18 (A)
Reference numeral 551a shown in FIG. 3B is a fitting hole having a shape corresponding to the shape of the end face of the brush holder 43, and a pair of grooves 553 is provided on the inner surface thereof. It has a thin portion 554. The portion between the thin portions 554 is used as a metal holder 552.

The metal holder 551 is attached to the end of the brush holder 43 by press-fitting the fitting hole 551a into the brush holder 43 slightly, and the inner surface of the metal holder 552 between the pair of thin portions 553 is formed. The flat wall 43a
, The elastically deformed distal end portion of the terminal fitting 550 is sandwiched, and this portion is pressed against the flat wall 43a. In FIG. 17, reference numeral 43e denotes a stopper cut and raised from the flat wall 43c at the tip of the brush holder 43, and the metal holder 551 is positioned in contact with the stopper.

In the seventh embodiment, a metal holder 555 having the shape shown in FIG. 19 may be used instead of the metal holder 551. This bracket retainer 555
The configuration is the same as that of the bracket retainer 551 except that a cutting portion 555a is provided in a part. Therefore, the metal holder 555 can be fitted to the tip of the brush holder 43 while expanding the cutting portion 555a, and has an advantage that the mounting can be easily performed.

In the configuration of the seventh embodiment, the protection switch means 47 is in a state equivalent to a closed state at a predetermined temperature or lower, and the protection switch means 47, the pigtail 45 and the brush 44 are electrically connected to each other.
The power supply side or the stator side is electrically connected to the commutator.

However, when an abnormal spark is generated between the commutator 29 and the brush 44, the temperature of the tip end of the brush device 41 is increased by the spark, so that the annular metal retainer 550 (or the terminal metal) is formed. 555) is thermally deformed and softened above a predetermined temperature. Therefore, the thin portion 5
With the breaking of 54, the distal end portion of the terminal fitting 550 is
It is restored in a direction away from the flat wall 43a so as to lose its own elastic deformation.

Thus, the protection switch means 47 includes the brush holder 43 as the switch contact piece and the terminal fitting 5.
Since the electrical connection between the brush device 50 and the brush device 41 is cut off, the current is cut off.
By stopping the operation of the commutator motor including the brush device 41 and continuing the operation, the risk of abnormal overheating of the commutator motor can be eliminated. That is, the same effects as in the first embodiment can be obtained, and the intended object of the present invention can be achieved.

FIGS. 20 to 22 show the essential parts of an eighth embodiment of the present invention. In the eighth embodiment, the arrangement of the terminal fitting 50 in the protection switch means 47 and the holder insulation 3
Only the configuration of 42 is different from that of the first embodiment, and the other configurations are shown in FIGS. 1 to 5 including the portions not shown in FIGS. 1 and 5, the same components as those shown in the first embodiment are denoted by the same reference numerals as those in the first embodiment. Although the description of the above and the description of the operation and effect based thereon are omitted, these same parts also constitute a part of the configuration of the present embodiment apparatus and the vacuum cleaner.

In the eighth embodiment, FIGS.
As shown in (2), the terminal fitting 50 is disposed to face the outer surface of the one curved wall 43c of the brush holder 43. Further, as shown in FIG. 21, the position of the brush 4
4 is provided corresponding to the side where a spark is generated. The arrow in FIG. 21 indicates the rotation direction of the commutator 29, and therefore, B in FIG. 21 is the spark generation side. In order to realize the arrangement of the terminal fittings 50, the fitting mounting holes 49 of the holder insulation 342 are formed as shown in FIG.
And the holder insulating body 342a as shown in FIG.
Is provided on the one curved wall 43c side of the spark generation.

In the configuration of the eighth embodiment, the protection switch means 47 is in a state equivalent to a closed state at a predetermined temperature or lower, and the protection switch means 47, the pigtail 45 and the brush 44 are electrically connected to each other.
The power supply side or the stator side is electrically connected to the commutator.

However, when an abnormal spark is generated between the commutator 29 and the brush 44, the conductor 51 having a small heat capacity is melted off due to a rise in the temperature at the tip end side of the brush device 41 due to the spark. As a result, the protection switch means 47 cuts off the electrical connection between one of the curved walls 43c of the brush holder 43 as the switch contact piece and the terminal fitting 50, and becomes a so-called open state. In the device 41, the current is cut off, the operation of the commutator motor including the brush device 41 is stopped, and the risk of abnormal heating of the commutator motor can be eliminated by continuing the operation.

That is, the same effects as in the first embodiment can be obtained, and the desired object of the present invention can be achieved. In addition, the spark generating side on which the protection switch means 47 is provided in the eighth embodiment is most easily affected by the spark generated between the brush 44 and the commutator 29 most directly, and the brush device 41 This is the place where the temperature rises the fastest.
For this reason, the intended purpose of the present invention can be achieved by making the melting of the conductor 51 more sensitively react to the abnormal temperature rise due to the occurrence of the abnormal spark.

Although the above embodiments are constructed as described above, the present invention is not limited to these embodiments, and the universal commutator motor and the DC commutator motor used other than the electric blower. And can be applied to
The postures of these electric motors during use are not limited to the above embodiments.

Further, in the present invention, the brush holder 44
The conductive means for electrically connecting the brush 43 and the brush 43 is not limited to the pigtail. For example, when the coil spring 46 is provided with both ends fixed to the brush 43 and the bottom wall 44d of the brush holder 44, the spring 46 is used. The brush holder 44 and the brush 43 can be electrically connected as conductive means, and the pigtail can be omitted accordingly.

[0108]

Since the present invention is configured as described above in detail, it has the following effects.

According to the brush device for a rotating electric machine according to the first aspect, the brush holder and the terminal fitting are used as the switch contact pieces, and the electric conductor is configured to melt and cut off the electrical connection at a predetermined temperature or higher . Provided at the end of the brush holder
At a predetermined temperature or lower, the protection switch means keeps the switch equivalent to a state where the switch is closed, and when the temperature is higher than the predetermined temperature, the conductor is melted to open the switch, and the operation of the rotating electric machine including the brush device is operated. Since the motor is stopped, the rotating electric machine can be protected against abnormal excessive temperature rise of the brush due to sparks between the commutator and the brush. This place
Protection switch means between the brush and the commutator
Reacts sharply to the sparks
The protective action of the rotating electric machine that copes quickly can be performed.
Wear. In addition, since a temperature sensor and a signal processing circuit used in conjunction with the sensor and having a large number of components are not required, the number of components is small, the structure is simple, the device can be operated with high reliability, and no shape memory alloy is used. Therefore, it can be provided at low cost.

[0110]

[0111] According to a brush device for a rotating electrical machine according to claim 2, the temperature sensor is not required, since the conductive body formed by solder or the like heat capacity is small, the number of parts is simple yet less structure, the brush Thus, the intended first object of the present invention can be achieved by performing a protective operation of the rotating electric machine for quickly coping with the temperature rise of the rotating electric machine.

According to the brush device for the rotating electric machine according to the third aspect , the molten conductor is prevented from solidifying between the brush holder and the terminal fitting to prevent them from being electrically connected again. The intended first object of the invention can be achieved by ensuring the irreversible operation of the means.

According to the brush device for a rotating electric machine according to the fourth aspect , most of the melted conductor is flipped away from the brush holder by the elastic force of the terminal fitting, and the melted conductor is again brush-bolted. Since the solidification between the terminal and the terminal fitting is prevented, the irreversible operation of the protection switch means can be ensured, and the desired first object of the present invention can be achieved.

According to the brush device for a rotating electric machine according to the fifth aspect, the brush holder and the terminal fitting are used as switch contact pieces, and the terminal fitting elastically deformed toward the brush holder is pressed against the outer surface of the holder. A brush holder having a metal contact holding portion for maintaining an electrical connection, and a metal retainer for restoring the terminal metal and disconnecting the electrical connection as the contact portion is thermally deformed and softened at a predetermined temperature or more and softens.
The protection switch means provided near the tip of the brush can protect the rotating electrical machine against abnormal overheating of the brush due to sparks between the commutator and the brush. Since a signal processing circuit that is used and has a large number of components is not required, the number of components is small, the structure is simple, the device can be operated with high reliability, and the configuration can be provided at low cost because no shape memory alloy is used.

In the configuration of claim 6 , the protection switch means arranged on the spark generating side which is most susceptible to the influence of the spark can react more sharply to the spark. The intended first object of the present invention can be achieved by performing the protective operation of the rotating electric machine.

[0116] According to the rotating electrical machine brush device according to claim 7, since the mutual positional relationship between the brush holder and the terminal fitting the holder insulation based can easily be put out, with a of the present invention more reliable The desired first object can be achieved, and since there is no need to find a mounting base for other terminal fittings, the structure is simple and the manufacturing is easy.

According to the electric vacuum cleaner of the eighth aspect , when the brush holder and the terminal fitting are used as the switch contact pieces.
Both are provided at or near the tip end of the brush holder.
By means of the protective switch means, the conductor or the terminal fitting for electrically connecting the brush holder and the terminal fitting is elastically deformed and pressed against the brush holder, and at a predetermined temperature or lower, a state equivalent to closing the switch. When the temperature is equal to or higher than a predetermined temperature, the switch is opened due to the melting of the conductor or the restoration of the terminal fitting accompanied by the breakage of the softened metal contact portion of the metal holder, and the switch is opened, and the electric blower including the brush device is provided. Since the operation of the commutator motor is stopped, even if an abnormal spark occurs between the commutator and the brush, there is no risk of the brush igniting due to abnormal heat generation. There is no danger of fire spreading on the muffler, and safety can be improved.
Moreover, since a temperature sensor and a signal processing circuit that is used in conjunction with the sensor and has a large number of components are unnecessary, the number of components is small, the structure is simple, the device can be operated with high reliability, and no shape memory alloy is used. Therefore, it can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a side view showing a partial cross section of a configuration of a vacuum cleaner according to a first embodiment of the present invention.

FIG. 2 is a side view showing a partial cross section of a configuration of a commutator motor of the electric blower provided in the electric vacuum cleaner shown in FIG. 1;

FIG. 3 is an enlarged cross-sectional view showing a configuration around a brush device of the commutator motor shown in FIG. 2;

FIG. 4 is a sectional view showing the configuration of the brush device according to the first embodiment of the present invention.

FIG. 5 is a diagram showing the brush device shown in FIG. 4 as viewed from the direction of arrow Z in FIG.

FIG. 6 is a sectional view showing a configuration of a brush device according to a second embodiment of the present invention.

FIG. 7 is a view showing the brush device shown in FIG. 6 as viewed from the direction of arrow Y in FIG.

FIG. 8 is a sectional view showing a configuration of a brush device according to a third embodiment of the present invention.

FIG. 9 is a sectional view showing a configuration of a brush device according to a fourth embodiment of the present invention.

FIG. 10 is a sectional view showing a configuration of a brush device according to a fifth embodiment of the present invention.

FIG. 11 shows the brush device shown in FIG.
The figure seen from the direction.

FIG. 12 is an exploded perspective view showing a part of the configuration of the brush device shown in FIG. 10;

FIG. 13 is a sectional view showing a configuration of a brush device according to a sixth embodiment of the present invention.

FIG. 14 shows the brush device shown in FIG.
The figure seen from the direction.

15 is an exploded perspective view showing a part of the configuration of the brush device shown in FIG. 13;

FIG. 16 is a plan view showing the configuration of the brush device shown in FIG. 13 in a state where the brush is pushed in;

FIG. 17 is a sectional view showing a configuration of a brush device according to a seventh embodiment of the present invention.

FIG. 18A is a perspective view illustrating a configuration of a metal holder provided in the brush device illustrated in FIG. 17; (B) is a front view which shows the structure of the metal holder provided with the brush apparatus shown in FIG.

FIG. 19 is a perspective view showing another embodiment of the metal holder used in the seventh embodiment.

FIG. 20 is a sectional view showing a configuration of a brush device according to an eighth embodiment of the present invention.

FIG. 21 is a sectional view showing the configuration of the brush device along the line VV in FIG. 20;

FIG. 22 shows the brush device shown in FIG.
The figure seen from the direction.

[Explanation of Signs ] 1 ... Vacuum cleaner main body 3 ... Dust collection chamber 11 ... Electric blower 13
... commutator motor, 14 ... silencer, 21 ... frame, 25
.. Armature, 29 commutator, 31 stator, 41 brush device, 42 holder insulation, 43 brush holder, 44
Brush, 45: Pigtail (conductive means), 46: Coil spring, 47: Protection switch means, 50, 150, 25
0, 350, 450, 550: terminal fittings, 51: conductive
Body, 152: Electrical insulating plate, 351, 451, ... Holder contact portion, 352, 452, 551, 555: Bracket holder,
352a, 552...

Continuation of the front page (56) References JP-U 1-90264 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02K 13/00

Claims (8)

(57) [Claims] 1. A brush device for a rotating electric machine, wherein a brush which is urged by a spring and elastically pressed against a commutator is provided in a cylindrical brush holder fixed to holder insulation,
The brush holder is formed of an electric conductor, and the brush holder and the brush are electrically connected via conductive means,
In the vicinity of the brush holder, a terminal fitting which is used as a switch contact piece together with the brush holder and is electrically connected to a current path flowing through the armature, and the terminal fitting and the brush holder are kept at a predetermined temperature or lower. The brush holder is provided with a protection switch means having an electric conductor which is electrically connected at a predetermined temperature and which melts and cuts the electric connection at a predetermined temperature or higher.
And a field coil of a stator of the rotating electric machine and the brush are electrically connected to each other via the switch means and the conductive means. 2. The apparatus according to claim 1, wherein said protection switch means is provided across said brush holder, said terminal fittings provided in non-contact with said holder, and said brush holder and terminal fittings electrically connected thereto. The brush device for a rotating electric machine according to claim 1, wherein the brush device is formed of a conductor. 3. An electric insulating plate which covers the terminal fitting with respect to the brush bolder while avoiding a portion where the conductor is provided, wherein the terminal fitting is provided so as to extend in a longitudinal direction of the brush holder. 3. The brush device for a rotating electric machine according to claim 2, wherein the brush device is interposed between the brush holder and the brush holder. 4. The brush switch and the terminal provided on the side of the brush holder elastically deformed so as to be in non-contact with the brush holder or the protection switch means elastically deformed and provided in contact with the brush bolder. The brush device for a rotating electric machine according to claim 1, wherein the brush device is formed by a metal fitting and the conductor electrically connected to and connected to the brush holder and the terminal metal fitting. 5. A brush device for a rotating electric machine, wherein a brush urged by a spring and elastically pressed against a commutator is provided in a cylindrical brush holder fixed to holder insulation.
The brush holder is formed of an electric conductor, and the brush holder and the brush are electrically connected via conductive means,
Protective switch means is provided near the tip side of the brush holder, and the protective switch means is used as a switch contact piece with the brush holder and the brush holder, which is elastically deformed on the holder side and is provided in contact with the brush bolder. And a terminal fitting connected to a current path flowing through the armature, and a fitting contact portion for pressing the terminal fitting against the outer surface of the brush holder. The terminal fitting is provided between the brush holder and the terminal fitting. And at least the metal contact portion is thermally deformed at a predetermined temperature and softened by a metal retainer for restoring the terminal metal, and a field coil of a stator of a rotating electrical machine through the switch means and the conductive means. A brush device for a rotating electric machine, wherein the brush device is electrically connected to the brush. 6. The protection switch means is connected to the commutator in front of the commutator.
On the side where sparks occur between the brush
The rotating electrical machine brush device according to any one of claims 1 to 5 . 7. The terminal fitting is attached to the holder insulation.
The rotating electric machine according to any one of claims 1 to 6.
Brush device. 8. A cleaner body having a dust collection chamber, and a commutator motor.
An air cleaner built in the main body of the vacuum cleaner, and
An air blower that draws air and a
And a breathable silencer made of synthetic resin placed
In the vacuum cleaner, the commutator motor includes a frame having a built-in armature and a stator.
Inside the cylindrical brush holder fixed to the holder insulation
It is urged by a spring to make the commutator of the armature elastic.
A brush device with a brush that can be pressed down is attached
The brush device is provided according to any one of claims 1 to 7.
The electric sweeping device according to any one of the preceding claims.
Remover.