JP2000245663A - Suction tool for vacuum cleaner, and vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suction tool for vacuum cleaner and a vacuum cleaner capable of reducing the temperature rise of an electric motor for driving a rotary brush. SOLUTION: The rotary brush 19 is freely rotatably provided inside a suction tool main body 18 so as to face a suction port 27 opened on the lower surface of the suction tool main body 18. For the rotary brush 19, the electric motor 30 for rotationally driving the rotary brush 19 and a gear and a gear part 45 for transmitting the rotation of the electric motor 30 to a brush holder 28 are provided inside the almost cylindrical brush holder 28 provided with plural brushes 29 on an outer peripheral surface. A ventilation hole 50 for discharging cooling air is formed on the outer peripheral surface of the brush holder 28 and the gear and the gear part 45 positioned between the ventilation hole 50 and the electric motor 30 are formed of synthetic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction device for a vacuum cleaner having a rotating brush rotated by an electric motor, and a vacuum cleaner connected to the suction device for the vacuum cleaner.

[0002]

2. Description of the Related Art Conventionally, this type of suction device for a vacuum cleaner has
It was configured as shown in FIG. Hereinafter, the configuration will be described.

[0003] As shown in the figure, a suction tool main body 1 includes a rotating brush 2 for releasing dust adhering to a surface to be cleaned such as a carpet.
, A suction port is provided on the bottom surface, and a connection pipe 3 communicating with a cleaner body (not shown) is rotatably provided at a rear portion. The bristle 4 is implanted on the outer peripheral surface of the rotating brush 2,
An electric motor 5 which is a driving source of the rotating brush 2, a planetary gear 6 mounted on the shaft of the electric motor 5, and reduces the rotation and transmits the rotation to the rotating brush 2, and is arranged between the electric motor 5 and the planetary gear 6. And a supporting member 7 provided therein.

The supporting member 7 is fixed to the electric motor 5 by a plurality of screws 8, and a groove 9 is formed on an end face of the supporting member 7, which is in contact with the electric motor 5, to improve ventilation from cooling holes provided in the electric motor 5 to improve heat radiation. The other end face is fitted to the inner ring 10 of the planetary gear 6 and covers the surface of the planetary gear 6. In addition, a key groove (not shown) is provided on the inner peripheral surface of the rotating brush 2, and a convex portion (not shown) projecting from the outer ring of the planetary gear 6 is fitted into the key groove, and a concave portion is formed. The cooling air flow path is formed in the axial direction. A lid 12 having a bearing 11 is attached to the opening at both ends of the rotating brush 2.

[0005] The fixed shaft 13 is formed in a hollow shape, one end of which is protruded to the side of the rotary brush 2, rotatably supports the rotary brush 2 via a bearing 11, and a lead wire connected to the electric motor 5 has a hollow portion. The other end is formed in a cylindrical shape and disposed inside the rotating brush 2 to support the outer periphery of the electric motor 5. The fixed covers 14 are attached to both ends of the rotating brush 2 to prevent dust from entering the rotating brush 2 and the bearing 11.

The rotary brush 2 is supported by the suction tool main body 1 via the fixed cover 14 and the fixed shaft 13, and substantially at the center of the rotary brush 2 opposed to the intake port 15 of the connection pipe 3, the rotary brush 2 is provided. Are formed with a plurality of ventilation holes 16 that communicate the inside and the outside. The leak hole 17 allows the outside air for cooling the electric motor to communicate with the inside of the rotating brush 2 through the hollow portion of the fixed shaft 13, and is formed on the side surface of the suction tool main body 1.

The operation of the above construction will be described. When the main body 1 and the main body of the cleaner are energized, the electric motor 5 rotates.
The rotating torque is increased while being reduced by the planetary gear 6 and transmitted to the rotating brush 2 so that the brush bristles 4 scrape out dust attached to the carpet or the like, and the scraped-out dust is sucked into the cleaner body. At this time, what is rotated by the electric motor 5 is the planetary gear 6, the rotating brush 2 and the lid 1.
The motor 5, the fixed shaft 13, the fixed cover 14, and the lead wires are fixed and held to the suction tool main body 1 only by the outer ring 2 and the bearing 11.

When the cleaner body is operated, a negative pressure is applied to a space surrounded by the suction tool body 1 and the floor, and outside air flows in from the outer periphery of the suction tool body 1 so that the suction port 15 of the connection pipe 3 is opened.
, And the dust on the floor is also sucked into the air inlet 15 by this air flow.

At this time, since a negative pressure also acts on the vicinity of the ventilation hole 16 inside the rotary brush 2 through the ventilation hole 16 provided opposite to the suction port 15, the suction tool is inserted through the hollow fixed shaft 13 and the leakage hole 17. A pressure difference is generated between the outside of the main body 1 and a side portion of the rotating brush 2 that is communicated with the outside, and the outside air flows into the inside of the rotating brush 2 through the hollow portion of the fixed shaft 13 through the leak hole 17 and rotates. A recess 2a provided around the electric motor 5 of the brush 2
, And flows toward the air hole 16, and flows out from the air hole 16 toward the air inlet 15 having a lower pressure than the inside of the rotating brush 2.

[0010]

In such a conventional structure, when the cleaner body is operated by pressing the suction port on the bottom surface of the suction tool body 1 against the floor surface, the suction tool body 1 is surrounded by the floor surface. A negative pressure is applied to the closed space and a negative pressure also acts near the ventilation hole 16 inside the rotary brush 2, so that the hollow fixed shaft 13 and the leak hole 1
7, a pressure difference is generated between the outside of the suction tool main body 1 and a side portion of the rotary brush 2 which is communicated with the outside, and the outside air leak hole 1 is formed.
7, flows into the interior of the rotary brush 2 through the hollow portion of the fixed shaft 13, passes around the electric motor 5, flows toward the ventilation hole 16, and can cool the electric motor 5, thereby reducing the temperature rise. can do.

On the other hand, when the electric motor 5 is rotated by energizing the suction tool main body 1 and the rotating brush 2 is rotated, dust attached to the carpet or the like is scraped off by the brush bristles 4.
The brush bristles 4 slide on a carpet or the like to generate static electricity. Since the electric motor 5 is connected to a commercial power supply, the generated static electricity enters the inside of the rotating brush 2 through the ventilation hole 16 and is discharged to the electric motor 5.

The motor 5 is electrically connected to a motor board (not shown) on which a rectifier for rectifying a commercial power supply voltage, a noise suppressor, and the like are mounted. There was a problem that the motor 5 was destroyed and could not operate.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, in which the motor is cooled to reduce the temperature rise, and the problem caused by the discharge of static electricity generated when the motor is rotated to rotate the rotating brush is eliminated. It aims to improve safety.

[0014]

According to the present invention, in order to achieve the above object, a rotary brush is rotatably provided in a suction tool main body so as to face a suction opening opened in a lower surface of the suction tool main body. The rotating brush is provided with an electric motor for rotating the rotating brush and a power transmission device for transmitting the rotation of the electric motor to the brush holder inside a substantially cylindrical brush holder provided with a dust scraping portion on an outer peripheral surface, and a brush. A ventilation hole for discharging cooling air is formed on the outer peripheral surface of the holder, and a power transmission device located between the ventilation hole and the motor is formed of synthetic resin. The motor can be cooled to reduce a rise in temperature. As well as eliminating problems caused by electrostatic discharge generated when rotating the rotating brush by rotating the motor,
Safety can be improved.

A rotary brush is rotatably provided in the suction tool main body so as to face a suction port opened on the lower surface of the suction tool main body, and the rotary brush is provided with a dust scraping portion on an outer peripheral surface thereof. Inside the cylindrical brush holder, an electric motor that rotationally drives the rotating brush, and a hollow shaft that holds the electric motor, guides the lead wire, and supports the rotating brush are provided, and the hollow shaft is externally exposed at least from the brush holder. The part is formed or covered with an insulating material, and static electricity generated by the rotating brush sliding on the carpet etc. is not discharged to the motor through the hollow shaft, eliminating problems caused by electrostatic discharge. And safety can be improved.

A vacuum cleaner body having a dust collection chamber for collecting dust therein and an electric blower is provided with a connection port connected to communicate with the vacuum cleaner suction tool. The motor can be cooled to reduce a rise in temperature, and a malfunction due to static electricity generated when the rotating brush is rotated by rotating the motor can be improved, so that safety can be improved.

[0017]

According to the first aspect of the present invention, a suction tool main body having a suction port opened on a lower surface, and a rotatably provided inside the suction tool main body so as to face the suction port. A rotating brush, the rotating brush having a substantially cylindrical brush holder provided with a dust scraper on an outer peripheral surface, an electric motor for rotating the rotating brush, and transmitting the rotation of the electric motor to the brush holder. A power transmission device, wherein the motor and the power transmission device are provided inside the brush holder, and a ventilation hole for discharging cooling air is formed on an outer peripheral surface of the brush holder, between the ventilation hole and the electric motor. The located power transmission device is made of synthetic resin, and when the electric motor provided inside the brush holder is rotated, the brush holder is driven via the power transmission device. At this time, the motor can be cooled in a path that takes in air from the end face of the brush holder and exhausts air from the ventilation hole formed on the outer peripheral surface, so that a rise in the temperature of the motor can be reduced, and the air gap between the ventilation hole and the motor can be reduced. Since the power transmission device located in between is made of synthetic resin, static electricity generated by the sliding of the rotating brush on the carpet will not be discharged to the motor, eliminating problems caused by electrostatic discharge. And safety can be improved.

According to a second aspect of the present invention, in the first aspect of the present invention, the power transmission device has a structure in which the end face on the side of the ventilation hole is covered with a synthetic resin, and is connected to the power transmission device. Even if the shaft on the input side is made of metal, by covering the end face on the vent side with synthetic resin, static electricity generated by the sliding of the rotating brush on the carpet will not be discharged to the motor, and the static electricity will be discharged. Can be eliminated, and safety can be improved.

According to a third aspect of the present invention, there is provided a suction tool body having a suction port opened on a lower surface, and a rotary brush rotatably provided in the suction tool body so as to face the suction port.
The rotating brush has a substantially cylindrical brush holder provided with a dust scraping portion on an outer peripheral surface, an electric motor for rotating and driving the rotating brush, and holding the electric motor and leading a lead wire to axially support the rotating brush. A hollow shaft, wherein the electric motor and the hollow shaft are provided inside the brush holder, and at least an externally exposed portion of the hollow shaft from the brush holder is formed or covered with an insulating material. Does not discharge to the electric motor through the hollow shaft due to the sliding of the rug on the carpet or the like, it is possible to eliminate the trouble caused by the discharge of the static electricity and improve the safety.

According to a fourth aspect of the present invention, in the first or the third aspect of the present invention, a motor board electrically connected to the motor is provided, and cooling air is passed from the motor board side. With this configuration, the motor substrate is not affected by the temperature rise of the motor and the temperature does not rise. Therefore, malfunction and failure do not occur, and reliability can be improved.

According to a fifth aspect of the present invention, in the first or the third aspect of the present invention, the motor is constituted by a commutator motor and configured to allow cooling air to pass from the commutator side. The child is not affected by a rise in the temperature of the electric motor and does not rise in temperature, so that the rectification can be reliably performed and reliability can be improved.

According to a sixth aspect of the present invention, in accordance with the first or third aspect of the present invention, there is provided a device for preventing an excessive rise in temperature of the electric motor, and the temperature of the electric motor rises abnormally. In such a case, the safety can be ensured by operating the excessive temperature rise prevention device.

According to a seventh aspect of the present invention, in the first or the third aspect of the present invention, there is provided an overcurrent prevention device for preventing an overcurrent of the motor. By operating the overcurrent prevention device, safety can be ensured.

According to an eighth aspect of the present invention, in the first or the third aspect of the present invention, a pressure detecting means for detecting a suction pressure is provided, and power is supplied to the electric motor in accordance with an output of the pressure detecting means. When the suction pressure detected by the pressure detecting means is reduced, the safety of the motor at the time of suction abnormality can be ensured by reducing or stopping the rotation speed of the motor.

According to a ninth aspect of the present invention, there is provided a vacuum cleaner body having a dust collecting chamber for collecting dust and dust therein and an electric blower.
It has a connection port connected so as to communicate with the vacuum cleaner suction tool according to any one of claims 1 to 8,
When the motor is rotated and the rotating brush is rotated, the motor can be cooled through a path that takes in air from the end face of the brush holder and exhausts air from the vent formed in the outer peripheral surface, thereby reducing the temperature rise of the motor. In addition, since the power transmission device located between the air hole and the electric motor is formed of synthetic resin, static electricity generated by the sliding of the rotating brush on the carpet can be discharged to the electric motor. In addition, it is possible to eliminate the problem caused by the discharge of static electricity, and to improve safety.

[0026]

An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 4, the suction tool main body 18 has a built-in rotary brush 19 (see FIG. 1) for releasing dust adhering to the surface to be cleaned such as a carpet, and a connection connected to an extension pipe 20 at the rear. The body 21 is provided rotatably. Vacuum cleaner body 2
Reference numeral 2 denotes a dust collecting chamber 23 for collecting dust therein and an electric blower 2.
And a connection port 2 provided in the cleaner body 22.
5, a hose 26 connected to the extension pipe 20 is connected, and the connecting body 21 of the suction tool main body 18 is configured to communicate with the connection port 25.

As shown in FIG. 1, the rotary brush 19 is rotatably provided in the suction tool main body 18 so as to face a suction port 27 opened on the lower surface of the suction tool main body 18. The rotary brush 19 is provided with a plurality of brushes 29 constituting a dust scraping portion on an outer peripheral surface of a substantially cylindrical brush holder 28 formed of a thermoplastic resin such as ABS, polystyrene, polypropylene or the like.

The dust scraper may be a brush, a thin blade, a strip having a wiping effect (for example, a cloth strip), or a combination of these.

As shown in FIG. 2, an electric motor 3 for rotatingly driving the rotating brush 19 is provided inside the brush holder 28.
0, a reduction gear 31 for reducing the rotation speed of the electric motor 30, a gear 3 for transmitting the output of the reduction gear 31 to the brush holder 28
2 and so on. Here, the rotating brush 19 incorporates the electric motor 30, the speed reducer 31, and the like, and has a diameter of 26 mm to 43 mm from the torque of the electric motor 30 and the performance of scraping up dust at the tip of the brush 29 on the outer peripheral surface. .

The motor 30 is composed of a commutator motor, and is provided with a motor board 33 on which a rectifier for rectifying a commercial power supply voltage, a noise suppressor, and the like are mounted. Connected lead wire 34
And is configured to be driven by a rectified voltage of the commercial power supply voltage. Here, the rotation speed of the electric motor 30 is
Since rotation is transmitted to the brush holder 28 via the reduction gear 31, the rotation speed is set to 3000 rpm to 15000 rpm. 3000rpm ~ 12000r when cleaning carpet
pm is preferred. The overcurrent prevention device 35 includes a positive temperature coefficient thermistor or the like, and prevents an overcurrent from flowing through the electric motor 30.

The speed reducer 31 is constituted by a planetary gear and connects the output shaft 36 of the electric motor 30 to reduce the rotational speed of the electric motor 30. Here, the reduction ratio of the reduction gear 31 is 1/3 to 1/9.
(Preferably, 1/5 to 1/7). The sound insulation tube 37 is
It covers the outer periphery of the speed reducer 31 and shields the sound, and is formed by aluminum die casting or plastic molding. The electric motor 30 and the reduction gear 31 are integrally formed and fixed to the electric motor 30 via the sound insulation tube 37, and the gear 32 is fitted to the output shaft 38. The bearing portion 39 is provided with the speed reducer 31 integrally formed with the electric motor 30 and the brush holder 2.
8, the inner ring is a small diameter portion 40 of the reduction gear 31
, And the outer ring is supported by a bearing support 41 formed on the inner surface of the brush holder 28.

On the commutator 30a side of the motor 30, a hollow shaft 42 having a hollow inner diameter and supporting the motor 30 integrally formed with the reduction gear 31 is fixed. This hollow shaft 42
Made of hardly deformable material such as aluminum alloy, carbon steel (S45C), industrial plastic, etc.
It is configured so that cooling air can be introduced smoothly. The inner ring of the bearing 43 is fixed to the hollow shaft 42, and the outer ring is supported by a cap 44 fixed to the end of the brush holder 28.

Here, the hollow shaft 42 is made of an aluminum alloy,
When made of a metal such as carbon steel (S45C), a buffer member 54 described below is formed of an insulating material, and at least the externally exposed portion of the hollow shaft 42 from the brush holder 28 is covered with the buffer member 54. I have.

The gear 32 is made of an industrial plastic such as polyacetal or polyamide, and a gear 45 formed on the inner surface of the brush holder 28 as shown in FIG.
And the gear 32 and the gear portion 45 constitute a power transmission device. Output shaft 38 of reduction gear 31 of gear 32
The hole 46 to be fitted with is made of carbon steel (S45C), stainless steel, sintered alloy, or the like.
The hole 8 and the hole 46 are configured to be covered with resin. A cushioning material 47 made of rubber, elastomer, or the like is interposed at a portion meshing with the gear portion 45, and the meshing sound between the tooth profiles is buffered by the elasticity of rubber, elastomer, or the like.

Here, the gear portion 45 is provided in the brush holder 2.
The gear 3 is formed on the inner surface at the substantially central portion in the axial direction of the gear 8.
2 is connected to the brush holder 28 at a substantially central portion in the axial direction of the brush holder 28. A cooling air passage hole 48 is provided outside the gear portion 45.
Is a cooling air passage 49 formed so as to pass from the hollow shaft 42 to the outside of the electric motor 30, the reduction gear 31 and the bearing support 41.
And to a vent hole 50 provided in the brush holder 28.

The motor 30 is provided with openings 30b and 30c for introducing cooling air to the commutator 30a side and an opening 30d for discharging cooling air, and the openings 30b and 30c are bypassed from the cooling air passage 49. That is, it is configured such that cooling air passes through the commutator 30a on the motor substrate 33 side.

The ventilation hole 50 is provided on the outer peripheral surface of the brush holder 28 at a position facing the connecting body 21. A dustproof filter 51 is provided on the inner surface of the brush holder 28. Is prevented from entering. Partition wall 52 between gear portion 45 and vent hole 50
Is provided integrally with the brush holder 28 to prevent dust from entering the speed reducer 31 from the vent hole 50 side and to reduce noise generated by the speed reducer 31 or noise caused by meshing between the gear 32 and the gear portion 45. Leakage from the vent hole 50 is prevented.

A holding portion 53 for holding the rotating brush 19 is formed inside both side ends of the suction tool main body 18, and an end of the rotating brush 19 is held by the holding portion 53 with a buffer member 54 interposed therebetween. I have. The cushioning member 54 is formed of a material having excellent elasticity such as rubber, elastomer, or the like.
9 absorbs vibrations and vibrations caused by the rotation of
It is hard to tell to.

An intake hole 55 is provided on the side of the suction tool main body 18 facing the hollow shaft 42, and a filter 56 is interposed between the intake hole 55 and the end surface of the hollow shaft 42.
The pressure sensor (pressure detecting means) 57 detects the suction pressure of the cleaner body 22 and is provided in the vicinity of the connecting body 21 so as to control the energization of the electric motor 30 according to the output of the pressure sensor 57. Make up.

The operation of the above construction will be described. When electricity is supplied to the suction tool main body 18 and the cleaner main body 22, the electric motor 30 incorporated in the rotary brush 19 is rotated, decelerated by the speed reduction device 31, and the rotation torque is increased to increase the rotation. Brush 19
Is driven to rotate. By the rotation of the rotating brush 19, dust attached to the carpet or the like is scraped up by the brush 29 provided on the outer peripheral surface of the brush holder 28, and the scraped-up dust is sucked into the cleaner body 22 through the extension pipe 20 and the hose 26. Is done.

The diameter of the rotating brush 19 is larger than that of the conventional one by incorporating the electric motor. The speed is increased, and the performance of scraping dust from the surface to be cleaned can be improved.

At this time, a negative pressure is applied to the space surrounded by the suction device main body 18 and the floor surface, and the outside air flows in from the outer periphery of the suction device main body 18, and the dust on the floor surface is also passed through the connecting body 21 by this air flow. It is sucked into. Since a negative pressure also acts on the vicinity of the ventilation hole 50 inside the rotary brush 19 through the ventilation hole 50 provided facing the connecting body 21, the outside air rotates through the hollow portion of the hollow shaft 42 through the suction hole 55. Brush 19
Flows into the interior.

The cooling air passage 49 passing outside the motor 30 and the reduction gear 31 and the gear 4
5 passes through a passage hole 48 provided outside the dustproof filter 5.
Cooling air flowing out of the air holes 50 through the cooling air 1 generates the electric motor 30, the electric motor substrate 33, and the like.

On the other hand, electricity is supplied to the suction tool body 19 to
When the rotating brush 19 is rotated, dust attached to a carpet or the like is scraped out by a brush 29 provided on the outer peripheral surface of the brush holder 28. At this time, the brush 29
Generates static electricity by sliding on a carpet or the like.

In this embodiment, the gear 32 and the gear portion 45
The partition 52 is provided integrally with the brush holder 28 between the air gap 50 and the air hole 50. Even if the partition 52 is not provided,
Since the gear 32 and the gear portion 45 are formed of a synthetic resin, static electricity generated when the rotating brush 19 slides on a carpet or the like is not discharged to the electric motor 30,
Problems caused by the discharge of static electricity can be eliminated, and safety can be improved.

Since the gear 32 is formed so as to cover the end face on the air hole 50 side with a synthetic resin, even if the input shaft connected to the gear 32 is made of metal, the end face on the air hole 50 side is synthesized. By covering with a resin, static electricity generated by the sliding of the rotating brush 19 on a carpet or the like is not discharged to the electric motor, so that troubles due to static electricity discharge can be eliminated, and safety can be improved. .

The hollow shaft 42 is made of industrial plastic, or made of aluminum alloy, carbon steel (S45).
C), the buffer member 54 is formed of an insulating material, and at least the brush holder 2 of the hollow shaft 42 is formed.
8 is covered with the cushioning member 54, the static electricity generated by the sliding of the rotating brush 19 on the carpet or the like is transmitted through the hollow shaft 42 to the electric motor 3.
It is possible to eliminate the problem caused by the discharge of static electricity without discharging to zero, thereby improving safety.

Further, since the motor 30 is configured to allow the cooling air to pass from the motor substrate 33 side, the motor substrate 33 is not affected by the temperature rise of the motor.
Since the temperature does not rise, no malfunction or failure occurs, reliability can be improved, and the commutator 30a
Since the cooling air is passed from the side, the commutator 3
0a is not affected by the temperature rise of the electric motor 30, and the temperature does not rise. Therefore, the rectifying action can be performed reliably, and the reliability can be improved.

Further, since an overcurrent preventing device 35 for preventing an overcurrent of the motor 30 is provided, if an overcurrent flows through the motor 30, the overcurrent preventing device 35 is operated to ensure safety. Further, since the power supply to the electric motor 30 is controlled in accordance with the output of the pressure sensor 57, if the suction pressure detected by the pressure sensor 57 decreases, the rotation speed of the electric motor 30 decreases. Alternatively, by stopping the motor, the safety of the electric motor 30 at the time of the suction abnormality can be ensured.

In the above embodiment, the overcurrent preventing device 35 for preventing the overcurrent of the motor 30 is provided. However, the overheating preventing device for preventing the motor 30 from overheating is provided. If the temperature rises abnormally, safety can be ensured by operating the over-temperature prevention device.

[0052]

As described above, according to the first aspect of the present invention, the suction tool main body having the suction port opened on the lower surface, and the rotation inside the suction tool main body so as to face the suction port. A rotating brush provided freely, wherein the rotating brush has a substantially cylindrical brush holder provided with a dust scraper on an outer peripheral surface, an electric motor for rotating and driving the rotating brush, and rotating the electric motor by the brush. A power transmission device for transmitting the cooling motor to the holder, the motor and the power transmission device being provided inside the brush holder, a ventilation hole for discharging cooling air being formed on an outer peripheral surface of the brush holder, and the ventilation hole and the electric motor being provided. The power transmission device located between the brush holder is made of synthetic resin. By rotating the electric motor provided inside the brush holder, air is sucked in from the end face of the brush holder and ventilation formed on the outer peripheral surface. Since the motor can be cooled in a more exhaust path, the temperature rise of the motor can be reduced, and the power transmission device located between the ventilation hole and the motor is formed of synthetic resin. Static electricity generated when the brush slides on a carpet or the like is not discharged to the electric motor, so that troubles due to static electricity discharge can be eliminated, and safety can be improved.

According to the second aspect of the present invention, since the power transmission device is configured such that the end face on the side of the ventilation hole is covered with synthetic resin, the input-side shaft connected to the power transmission device is made of metal. Even so, by covering the end face on the ventilation hole side with synthetic resin, static electricity generated by the rotating brush sliding on the carpet etc. will not be discharged to the electric motor, and it is possible to eliminate problems caused by static electricity discharge. And safety can be improved.

According to the third aspect of the present invention, there is provided a suction tool body having a suction port opened on a lower surface, and a rotary brush rotatably provided in the suction tool body so as to face the suction port. The rotary brush is provided with a substantially cylindrical brush holder provided with a dust scraper on an outer peripheral surface, an electric motor for rotating the rotary brush, and a lead wire holding the electric motor and leading a lead wire to form the rotary brush. A hollow shaft that supports the shaft, the motor and the hollow shaft are provided inside the brush holder, and at least an externally exposed portion of the hollow shaft from the brush holder is formed or covered with an insulating material, Static electricity generated by the sliding of the rotating brush on the carpet etc. does not discharge to the motor through the hollow shaft, eliminating problems caused by electrostatic discharge.
Safety can be improved.

According to the fourth aspect of the present invention, since the cooling air is passed from the motor substrate side electrically connected to the motor, the motor substrate is not affected by the temperature rise of the motor. Since the temperature does not rise and the temperature does not rise, malfunction and failure do not occur, and the reliability can be improved.

According to the fifth aspect of the present invention, since the motor is constituted by a commutator motor and configured to allow cooling air to pass from the commutator side, the commutator is not affected by the temperature rise of the motor. Because it does not receive and the temperature does not rise,
The rectifying action can be reliably performed, and the reliability can be improved.

According to the sixth aspect of the present invention, since the overheating prevention device for preventing the overheating of the motor is provided, if the temperature of the motor rises abnormally, the overheating prevention device is provided. Operate to ensure safety.

According to the seventh aspect of the present invention, an overcurrent preventing device for preventing an overcurrent of the motor is provided.
When an overcurrent flows through the motor, safety can be ensured by operating the overcurrent prevention device.

According to the eighth aspect of the present invention, the pressure detecting means for detecting the suction pressure is provided, and the power supply to the electric motor is controlled in accordance with the output of the pressure detecting means. When the suction pressure detected by the pressure detecting means decreases, the safety of the motor at the time of suction abnormality can be ensured by reducing or stopping the rotation speed of the motor.

According to the ninth aspect of the present invention, there is provided a vacuum cleaner main body including a dust collection chamber for collecting dust and dust therein and an electric blower, according to any one of the first to eighth aspects. Since the connection port is provided so as to communicate with the suction device for a vacuum cleaner described above, when the electric motor is rotated and the rotating brush is rotated, air is suctioned from the end face of the brush holder and the communication formed on the outer peripheral surface. Since the motor can be cooled in a path exhausted from the pores, the temperature rise of the motor can be reduced, and the power transmission device located between the vent and the motor is formed of synthetic resin. In addition, static electricity generated by the sliding of the rotating brush on the carpet or the like is not discharged to the electric motor, so that troubles due to the discharge of static electricity can be eliminated, and safety can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a suction tool for a vacuum cleaner according to one embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part of the suction device for the vacuum cleaner.

FIG. 3 is an enlarged sectional view taken along line AA of FIG. 1;

FIG. 4 is a perspective view of the vacuum cleaner having the vacuum cleaner suction tool.

FIG. 5 is a cross-sectional view of a conventional vacuum cleaner suction tool.

[Explanation of symbols]

 18 Suction Tool Main Body 19 Rotary Brush 27 Suction Port 28 Brush Holder 29 Brush (Dust Scavenging Part) 30 Electric Motor 32 Gear (Power Transmission Device) 45 Gear Part (Power Transmission Device) 50 Vent

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tetsuo Imai 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 72) Inventor Hayashi Seiko 1006 Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 3B061 AA17 AD05 AD12

Claims (9)

[Claims] 1. A suction tool main body having a suction port opened on a lower surface, and a rotating brush rotatably provided in the suction tool body so as to face the suction port, wherein the rotary brush has an outer peripheral surface. A substantially cylindrical brush holder provided with a dust scraper, a motor for driving the rotating brush to rotate, and a power transmission device for transmitting rotation of the motor to the brush holder; the motor and the power transmission device; Is provided inside the brush holder, a ventilation hole for discharging cooling air is formed on the outer peripheral surface of the brush holder, and a power transmission device located between the ventilation hole and the electric motor is formed of a synthetic resin. Suction device. 2. The suction device for a vacuum cleaner according to claim 1, wherein the power transmission device is configured to cover an end surface on the side of the ventilation hole with a synthetic resin. 3. A suction tool main body having a suction port opened on a lower surface thereof, and a rotary brush rotatably provided in the suction tool main body so as to face the suction port. A substantially cylindrical brush holder provided with a dust scraper, an electric motor that rotationally drives the rotary brush, and a hollow shaft that holds the electric motor, leads out a lead wire, and supports the rotary brush, A suction tool for a vacuum cleaner, wherein an electric motor and a hollow shaft are provided inside the brush holder, and at least a portion of the hollow shaft that is externally exposed from the brush holder is formed or covered with an insulating material. 4. The suction tool for a vacuum cleaner according to claim 1, wherein a motor substrate electrically connected to the motor is provided, and cooling air is passed from the motor substrate side. 5. The suction tool for a vacuum cleaner according to claim 1, wherein the electric motor is a commutator motor, and is configured to allow cooling air to pass from a commutator side. 6. The suction tool for an electric vacuum cleaner according to claim 1, further comprising an overheating prevention device for preventing overheating of the electric motor. 7. The suction device for a vacuum cleaner according to claim 1, further comprising an overcurrent prevention device for preventing an overcurrent of the electric motor. 8. The suction tool for a vacuum cleaner according to claim 1, further comprising pressure detection means for detecting a suction pressure, wherein the power supply to the electric motor is controlled in accordance with the output of the pressure detection means. . 9. A vacuum cleaner body provided with a dust collecting chamber for collecting dust and dust therein and an electric blower communicates with the vacuum cleaner suction tool according to any one of claims 1 to 8. Vacuum cleaner with a connection port to be connected as.