JP2002315700A - Floor brush for vacuum cleaner and vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of breaking down by exceeding a heat resistant temperature of a motive power transmission means by heating of an electric motor without being sufficiently cooled since an air current reduces when the air volume reduces when dust and dirt become full in a cleaner body. SOLUTION: Since a motive power transmission device 27 is oppositely arranged to a suction passage 35, an ambient temperature of the motive power transmission device 27 sufficiently drops. Temperature rise in the motive power transmission device 27 reduces, and heating of the motive power transmission device 27 starts from a lower point, without exceeding the heat resistant temperature of the motive power transmission device 27. Therefore, breakdown can be prevented. Even if heating of an electric motor 26 is received.

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 A conventional suction device for a vacuum cleaner and a vacuum cleaner of this type are configured as shown in FIG. Hereinafter, the configuration will be described.

As shown in FIG. 1, a suction tool main body 1 has a built-in rotary brush 2 for releasing dust adhering to a surface to be cleaned such as carpet, a suction port provided on a bottom surface, and a cleaner body (not shown) at a rear portion. ) Is rotatably provided. An electric motor 5 which is a driving source of the rotating brush 2 and has a bristle 4 implanted on the outer peripheral surface of the rotating brush 2,
A planetary gear 6 mounted on the shaft of the electric motor 5 to reduce the rotation and transmit the rotation to the rotating brush 2;
And a support member 7 disposed therebetween.

The supporting member 7 is fixed to the electric motor 5 by a plurality of screws 8, and a groove 9 for improving heat radiation by improving ventilation from cooling holes provided in the electric motor 5 is provided on an end face which comes into contact with the electric motor 5. The other end face engages with the inner ring 10 of the planetary gear 6 and covers the surface of the planetary gear 6. 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. Rotating brush 2
A lid 12 having a bearing 11 is attached to the opening at both ends of the cover.

[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 connects a lead wire connected to the electric motor 5 to the 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 5 to communicate with the inside of the rotary brush 2 through the hollow shaft of the fixed shaft 13, and is formed on the side surface of the suction tool main body 1. The operation will be described in the above-described configuration. When electric current is applied to the suction tool main body 1 and the cleaner main body, the electric motor 5 rotates, the rotational torque is increased while being reduced by the planetary gears 6, transmitted to the rotary brush 2, and the carpet 4 is provided by the brush bristles 4. The dust attached to the device is scraped out, and the scraped dust is sucked into the cleaner body. At this time, only the planetary gear 6, the rotating brush 2, the lid 12, and the outer ring of the bearing 11 are rotated by the electric motor 5, and the electric motor 5, the fixed shaft 13, the fixed cover 14, and the lead wire are connected to the suction tool main body 1. Fixedly held.

When the cleaner body is operated, a negative pressure is applied to the 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 leak 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.

[0009]

However, in the conventional suction device for a vacuum cleaner described above, the means for cooling the planetary gear 6 uses the airflow flowing into the interior of the rotary brush 2 and the intake air sucked in from the suction port 15 to rotate the rotary brush 2. Is cooled by airflow from inside and outside. However, when the vacuum cleaner body is full of dust and the air volume is reduced, the airflow is reduced and is not sufficiently cooled, and the heat generated by the electric motor 5 causes the planetary gear 6 to exceed the heat-resistant temperature and break down. There was a problem that the rotating brush 2 did not drive when used.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a suction tool main body having a suction port opened on a lower surface;
A motor having a joint having an intake passage communicating with the suction port, a rotating brush rotatably provided facing the suction port, and an electric motor that rotationally drives the rotating brush inside the rotating brush; and A power transmission device for transmitting rotation to the rotary brush is provided, and the power transmission device is provided to face the intake passage.

According to the above invention, since the power transmission device (reduction device) is provided on the front surface of the intake passage, the ambient temperature of the power transmission device (reduction device) is sufficiently reduced. Even when the temperature rise of the device decreases and the motor generates heat, the heat of the power transmission device (reduction device) starts from a low place. be able to.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to a first aspect of the present invention is directed to a suction tool body having a suction port opened on a lower surface, a joint having an intake passage communicating with the suction port, and An electric motor for rotatably driving the rotary brush inside the rotary brush, and a power transmission device for transmitting rotation of the electric motor to the rotary brush, the power transmission being provided. Since the device is provided to face the intake passage, and the power transmission device (reduction device) is provided in front of the intake passage, the ambient temperature of the power transmission device (reduction device) is sufficiently reduced. Even if the temperature rise of the power transmission (reduction gear) decreases and the motor generates heat, the heat generation of the power transmission (reduction gear) starts from a low place and exceeds the heat resistant temperature of the power transmission (reduction gear). Destruction It is possible to prevent.

According to a second aspect of the present invention, in the first aspect of the present invention, the power transmission device is constituted by a gear part formed of a synthetic resin, and the synthetic resin forming the gear part is more than a polyacetal. Since a material having a high thermal conductivity and a high heat resistance temperature is used, the amount of heat transmitted to the power transmission device (reduction device) can be quickly generated even if the motor receives heat. In addition, by improving the upper limit temperature of destruction by improving the heat resistant temperature of the power transmission unit (planetary gear), it is possible to prevent the power transmission device (reducer) from being broken without exceeding the heat resistant temperature.

According to a third aspect of the present invention, there is provided a suction tool main body having a suction port opened on a lower surface, and a rotating brush rotatably provided facing the suction port, wherein the rotating brush is provided inside the rotating brush. A motor for rotating the brush, a power transmission device for transmitting the rotation of the motor to the rotating brush, and a detection unit for detecting an outer temperature of the motor on an outer periphery of the motor; In order to stop the motor at a temperature before the power transmission device (planetary gear) is destroyed by detecting the amount of heat transmitted to the power transmission device (reduction device) in response to the heat generated by the motor, the power transmission device ( Destruction can be prevented without exceeding the heat-resistant temperature of the speed reducer).

According to a fourth aspect of the present invention, in the third aspect of the present invention, a detection unit is provided at a portion defined by a cooling passage through which cooling air for cooling the motor flows in from the side opposite to the output shaft of the motor. Therefore, by improving the correlation between the detection unit that detects the heat generation amount of the motor and the heat generation amount of the motor, and by reducing the detection error of the detection unit, it is possible to control the heat generation amount of the motor with high accuracy, thereby achieving power transmission. Since the motor is stopped at the temperature before the device (planetary gear) is broken, it is possible to prevent breakage without exceeding the heat-resistant temperature of the power transmission device (reduction device) and to prevent the detection unit from malfunctioning during use. Prevent detection,
Usability can be improved.

According to a fifth aspect of the present invention, in the third or fourth aspect of the present invention, a concave storage groove portion provided on the side opposite to the output shaft of the motor, and a detection portion are housed in the storage groove portion. Since a conductive plate for transmitting the heat of the motor is provided in the storage section groove in the detection section, the correlation between the detection section for detecting the heat generation amount of the motor and the heat generation amount of the motor is improved, and the detection section is detected. By minimizing the error, the calorific value of the electric motor is controlled accurately, and the motor is stopped at the temperature before the power transmission device (planetary gear) is destroyed. Can be prevented without exceeding, and erroneous detection of the detection unit occurring during use can be prevented, so that usability can be improved. In addition, since the size of the electric motor can be reduced, the suction tool main body can be made lighter and smaller, and it is possible to provide a small-turn and effective usability.

[0017] The invention described in claim 6 is the above-mentioned claim 3-
In the invention according to any one of the fifth to fifth aspects, a cover body is provided to cover the motor and the detection unit from the outer peripheral surface of the motor, so that the correlation between the detection unit that detects the heat generation amount of the motor and the heat generation amount of the motor is improved. In order to stop the motor at a temperature before the power transmission device (planetary gear) is destroyed by precisely controlling the heat generation amount of the motor by reducing the detection error of the detection unit, the power transmission device It is possible to prevent breakage without exceeding the heat-resistant temperature of the (planetary gear), to prevent erroneous detection of the detection unit occurring during use, and to improve usability. In addition, since the size of the electric motor can be reduced, the suction tool main body can be made lighter and smaller, and it is possible to provide a small-turn and effective usability.

According to a seventh aspect of the present invention, there is provided a suction tool main body having a suction port opened on a lower surface, and a rotating brush rotatably provided facing the suction port, wherein the rotating brush is provided inside the rotating brush. An electric motor for rotating the brush and a power transmission device for transmitting the rotation of the electric motor to the rotating brush are provided, and a gap between an outer peripheral wall of the electric motor and an inner peripheral wall of the rotating brush is set to about 2 mm. Of the power transmission device (planetary gear) can be prevented from destruction without exceeding the heat resistant temperature of the power transmission device (planetary gear).

The invention according to claim 8 has a suction tool main body having a suction port opened on a lower surface, and a rotating brush rotatably provided facing the suction port, wherein the rotating brush is provided inside the rotating brush. Since an electric motor for rotating the brush and a power transmitting device for transmitting the rotation of the electric motor to the rotating brush are provided, and the output shaft constituting the power transmitting device is formed of a material having a lower thermal conductivity than iron. In addition, since heat conduction of the electric motor transmitted from the output shaft to the reduction gear (planetary gear) is prevented, breakage can be prevented without exceeding the heat-resistant temperature of the reduction gear (planetary gear).

According to a ninth aspect of the present invention, there is provided a vacuum cleaner having a dust collecting chamber and a conduction blower for collecting dust therein.
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,
Since the power transmission device (reduction device) is provided in front of the intake passage, the ambient temperature of the power transmission device (reduction device) is sufficiently reduced, and the temperature rise of the power transmission device (reduction device) is reduced. Even if the electric motor generates heat, the power transmission device (reduction device) generates heat at a low temperature, so that the power transmission device (reduction device) can be prevented from breaking without exceeding the heat-resistant temperature.

[0021]

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 to FIG. 3 show a vacuum cleaner and its suction device according to a first embodiment of the present invention. The suction tool main body 18 has a built-in rotary brush 19 for releasing dust adhering to the surface to be cleaned such as carpet, a suction port 20 provided on the bottom surface, and a cleaner main body 21, a hose 22, and an extension pipe 23 provided at a rear portion. A connecting pipe 24 is provided rotatably.

The brush bristles 25 are implanted on the outer peripheral surface of the rotating brush 19, and the motor 2 serving as a driving source of the rotating brush 19 is provided inside.
6, a planetary gear 27 mounted on the shaft of the electric motor 26 to reduce rotation and transmit the rotation to the rotating brush 19 (a power transmission device or a reduction device, which is hereinafter referred to as a planetary gear); Support member 28 disposed between
And built-in.

The difference between the largest outer diameter 47 of the electric motor 26 and the inner diameter 48 of the rotary brush 19 for accommodating the electric motor 26 is set to 4 mm or less, whereby the gap between the outer periphery of the electric motor 26 and the inner circumference of the rotary brush 19 is reduced to about 2 mm. It has been set.

The planetary gear 27 is a device for reducing the output of the electric motor 26. The output of the electric motor 26 is a sun gear 38, which is made of steel such as iron. Inside the planetary gear 27, there are provided three or four planet gears 39 which are provided around a sun gear 38 which is an output shaft for transmitting the output of the electric motor 26 and mesh with the sun gear 38. The inside is driven to rotate. The output of the planet gear 39 is transmitted to a carrier 41 provided before and after the planet gear 39, and the reduced output of the electric motor 26 is transmitted from the carrier 41 to the rotating brush 19 via the output unit 42. Also, the planetary gear 27
Is provided at a position facing the connection pipe 24.

The planet gear 39 and the internal gear 40 are made of synthetic resin in order to reduce the noise when rotating. The planet gear 39 and the internal gear 40 have higher thermal conductivity and heat resistance than polyacetal which is generally used as synthetic resin. It is molded from a mixture of PA46 or PA66 mixed with glass fibers or carbon fibers. The heat-resistant temperature is desirably set to about 110 ° C. based on the heat-resistant temperature of the electric motor 26 or the rotating brush 19.

The support member 28 is fixed to the electric motor 26 by a plurality of screws 29, and a groove 30 is formed on an end face of the electric motor 26, which is in contact with the electric motor 26 to improve ventilation from cooling holes provided in the electric motor 26 and improve heat radiation. The other end face is engaged with the inner ring 31 of the planetary gear 27 and covers the surface of the planetary gear 27. A key groove (not shown) is provided on the inner peripheral surface of the rotating brush 19, and a convex portion (not shown) protruding from the outer ring of the planetary gear 27 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 32 having a bearing 31 is attached to the opening at both ends of the rotating brush 19.

The fixed shaft 33 is formed in a hollow shape, one end of which is projected to the side of the rotating brush 19, rotatably supports the rotating brush 19 via a bearing 31, and connects a lead wire connected to the electric motor 26 to the hollow portion. The other end is formed in a cylindrical shape and disposed inside the rotating brush 19, and supports the outer periphery of the electric motor 26. The fixed covers 34 are attached to both ends of the rotating brush 19 to prevent dust from entering the rotating brush 19 and the bearing 31.

The rotary brush 19 is supported by the suction tool main body 18 via the fixed cover 31 and the fixed shaft 33, and a rotary brush 19 is provided near a substantially central portion of the rotary brush 19 facing the air inlet 35 of the connection pipe 24. A plurality of ventilation holes 36 communicating between the inside and the outside of 19 are formed. The leak hole 37 allows the outside air for cooling the electric motor 26 to communicate with the inside of the rotating brush 19 through the hollow shaft of the fixed shaft 33, and is formed on the side surface of the suction tool main body 18.

On the opposite side of the electric motor 26 to which the sun gear 38 is attached, there is provided a thermoprotector 43 for detecting the amount of heat of the electric motor 26 (which is a detection unit, hereinafter, a circulator is also referred to as a protector). Thermo protector 43
The electric motor 26 is placed inside the outer wall of the electric motor 26.
Is housed in a concave storage groove portion 44 provided in the recess. The heat generated by the electric motor 26 is stored in the storage groove 44 by the thermoprotector 43.
A conductive plate 45 is provided so as to transmit the electric current to the power supply. The conductive plate 45 is made of a copper plate having good thermal conductivity. In order to improve the output of the electric motor 26, a cover 46 made of a magnetic material such as iron is provided on the outer periphery of the electric motor 26, and the cover 46 is arranged so as to reach the upper surface of the thermoprotector 43. ing.

Next, the operation and function will be described. When electricity is supplied to the suction tool main body 18 and the cleaner main body 21, the electric motor 26 rotates, and the rotational torque is increased while being reduced by the planetary gear 27 and transmitted to the rotary brush 19. Brush hair 2
The dust adhering to the carpet is scraped out by 5 and the scraped dust is sucked into the cleaner body. At this time, the motor 26 rotates the planetary gear 27, the sun gear 28, the planet gear 39, the carrier 40, the output unit 42, the rotating brush 19, the lid 32, and the bearing 31.
, The internal gear 40, the electric motor 26, the fixed shaft 33, the fixed cover 34, and the lead wire are
8 is fixedly held.

When the cleaner body is operated, a negative pressure is applied to the space surrounded by the suction tool body 18 and the floor surface, and outside air flows from the outer periphery of the suction tool body 18 to the suction port 35 of the connection pipe 24. The dust flows into the air inlet 35 together with the dust on the floor due to the airflow. At this time, the suction port 3
Since the negative pressure also acts on the vicinity of the ventilation hole 36 inside the rotary brush 19 through the ventilation hole 36 provided so as to substantially face the suction device 5, the suction tool main body 18 is formed via the hollow fixed shaft 33 and the leakage hole 37.
A pressure difference is generated between the outside of the rotating brush 19 and the side portion of the rotating brush 19 communicating with the outside, and the outside air flows into the inside of the rotating brush 18 through the hollow portion of the fixed shaft 33 from the leak hole 37, and the rotating brush 19 The air flows through the concave portion 19 a provided around the electric motor 26 toward the air hole 36, and flows out from the air hole 36 toward the air inlet 35 having a lower pressure than the inside of the rotating brush 19. Further, since the planetary gear 27 is located in a place where the ambient temperature of the rotary brush 19 is reduced and where the intake air is strongest, the internal components inside the rotary brush 19 are most cooled.

Further, since the outer periphery of the rotating brush 19 is cooled by the intake air, the cooling is propagated from the outer periphery of the rotating brush 19 to the inside to reduce the temperature rise in the space where the electric motor 26 is built, thereby reducing the electric motor. The calorific value of 26 is reduced.

Next, the electric motor 26 generates heat by stopping the vacuum cleaner main body 21 or sucking a large amount of dust to eliminate or reduce the suction air, and the heat is generated via the sun gear 38 to the planet gear 39. The power is transmitted to the internal gear 40. The heat-resistant temperature of the planetary gear 27 is determined by these gears. In the present embodiment, the heat dissipation (thermal conductivity) is good, and since the heat resistance is excellent, thermal destruction can be prevented. In addition, since the planetary gear 27 is provided at a position facing the connection pipe 24, the planetary gear 27 is a component that is most cooled among components built in the rotating brush 19, and the heat generated by the electric motor 26 propagates. Therefore, the rate of heat rise is small because the starting temperature when the temperature rises is low,
Thermal destruction can be prevented.

In addition, since the sun gear 38 is formed of a material having a lower thermal conductivity than iron which is generally used for the heat generated by the electric motor 26, the amount of heat transmitted from the electric motor 26 to the sun gear 38 is reduced, so that the sun gear 38 The amount of heat generated by the planet gears 39 and the internal gears 40 that are in contact with the gears is reduced. As a result, the suction tool main body 18 is provided with the rotating brush 19 that is excellent in heat resistance and hard to break, and the amount of heat transmitted by the electric motor 26 is reduced, and the planet gear 2 is excellent in heat resistance and hard to break. Since the suction tool main body 18 includes the brush 19, a highly reliable vacuum cleaner that can be used for a long time can be provided.

The motor 26 generates heat when the main body of the cleaner 21 is stopped or when a large amount of dust is sucked out or there is no suction air, and the motor 26 generates heat. The heat is generated via the sun gear 38, the planet gear 39, and the internal gear. To the gear 40. The heat-resistant temperature of the planetary gear 27 is determined by these gears. If the heat generated by the electric motor 26 is high, these gears are thermally destroyed.
In step 3, the motor 26 is stopped when it reaches a certain temperature range. The thermoprotector 43 is a conductive plate 45
The power supply of the electric motor 26 is stopped by detecting the amount of heat of the electric motor 26 transmitted from the body winding 46. At this time, a difference occurs between the outer temperature of the electric motor 26 and the operating temperature of the thermoprotector 43 due to the propagation efficiency. Here, the operating temperature of the thermoprotector 43 is set to 75 ° C. in order to operate the motor 26 at a temperature of 120 ° C. to 110 ° C. Thereby, it becomes the suction tool main body 18 provided with the rotating brush 19 which is excellent in heat resistance and is hard to break, and a highly reliable vacuum cleaner which can be used for a long time can be provided. Further, even if the thermoprotector 43 is incorporated, the size of the outer periphery of the motor 26 can be reduced by providing the storage groove 45 in the motor 26, and the motor 26 can be reduced in size. It is possible to provide an easy-to-use vacuum cleaner suction tool that can be easily cleaned. Thereby, the calorific value of the electric motor 26 is reduced, and the suction tool main body 18 provided with the rotating brush 19 that is excellent in heat resistance and hard to break is provided, and a highly reliable vacuum cleaner that can be used for a long time can be provided. it can. In the above embodiment,
Although the components for transmitting power to the rotating brush 19, such as the electric motor 26, have been described as being incorporated in the rotating brush 19, the electric motor 26 is incorporated in the suction tool main body 18 for transmitting power to the rotating brush 19 and transmitted. The same effect can be obtained even with the suction tool main body 18 using a belt or the like as a means.

[0037]

According to the present invention as described above,
Since the power transmission device (reduction device) is provided facing the intake passage, the ambient temperature of the power transmission device (reduction device) is sufficiently reduced, so that the temperature rise of the power transmission device (reduction device) is reduced. Even if the motor receives heat, the heat of the power transmission device (reduction device) starts from a low place, so that the power transmission device (reduction device) can be prevented from breaking without exceeding the heat-resistant temperature.

Further, the amount of heat transmitted to the power transmission device (reduction device) in response to the heat generated by the motor is detected by detecting the amount of heat generated by the motor, and the motor is stopped at a temperature before the power transmission device (planetary gear) is destroyed. Therefore, destruction can be prevented without exceeding the heat-resistant temperature of the power transmission device (reduction device).

Further, the calorific value of the electric motor is easily reduced by the ambient temperature inside and outside the rotary brush, and the power transmission device (planetary gear) can be prevented from breaking without exceeding the heat resistant temperature.

Further, since heat conduction of the electric motor transmitted from the output shaft to the speed reducer (planetary gear) is prevented, it is possible to prevent the speed reducer (planetary gear) from being broken without exceeding the heat-resistant temperature.

[Brief description of the drawings]

FIG. 1 is a perspective view of a vacuum cleaner provided with a vacuum cleaner suction tool according to one embodiment of the present invention.

FIG. 2 is a sectional view of the suction device for the electric vacuum cleaner.

FIG. 3 is an exploded view of a planetary gear of the vacuum cleaner suction tool.

FIG. 4 is a cross-sectional view of the electric motor of the suction device for the vacuum cleaner.

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

[Explanation of symbols]

 19 rotating brush 20 suction port 24 connection pipe 25 intake passage 26 electric motor 27 power transmission means (reduction gear, planetary gear)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshitaka Hayami 1006 Kazuma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. F-term (reference) 3B061 AD03 AD05 AD05 AE02 AE13

Claims (9)

[Claims] A suction tool main body having a suction port opened on a lower surface thereof; and a joint having an intake passage communicating with the suction port.
A rotating brush provided rotatably facing the suction port, an electric motor for rotating and driving the rotating brush inside the rotating brush, and a power transmission device for transmitting rotation of the electric motor to the rotating brush. And a suction device for a vacuum cleaner, wherein the power transmission device is provided to face the intake passage. 2. The power transmission device according to claim 1, wherein the power transmission device is constituted by a gear part made of synthetic resin, and the synthetic resin forming the gear part is made of a material having a higher thermal conductivity and a higher heat resistance temperature than polyacetal. Suction tool for vacuum cleaner. 3. An electric motor having a suction tool main body having a suction port opened on a lower surface thereof, and a rotating brush rotatably provided facing the suction port, wherein the electric motor rotatably drives the rotating brush inside the rotating brush. And a power transmission device for transmitting the rotation of the electric motor to the rotary brush, and a suction unit for a vacuum cleaner having a detection unit for detecting an outer temperature of the electric motor on an outer periphery of the electric motor. 4. The suction tool for a vacuum cleaner according to claim 3, wherein a detection section is provided at a portion defined by a cooling passage through which cooling air for cooling the motor flows from a side opposite to the output shaft of the motor. 5. A concave storage groove provided on a side opposite to the output shaft of the electric motor, and a detection unit is accommodated in the storage groove, and a conductive plate for transmitting heat of the electric motor to the detection unit is provided in the storage groove. The suction tool for a vacuum cleaner according to claim 3 or 4, wherein the suction tool is provided for a vacuum cleaner. 6. The suction tool for a vacuum cleaner according to claim 3, wherein a cover body is provided from an outer peripheral surface of the electric motor to cover the electric motor and the detection unit. 7. An electric motor having a suction tool main body having a suction port opened on a lower surface thereof, and a rotating brush rotatably provided facing the suction port, wherein the electric motor rotatably drives the rotating brush inside the rotating brush. A power transmission device for transmitting rotation of the electric motor to the rotating brush, and a gap between an outer peripheral wall of the electric motor and an inner peripheral wall of the rotating brush is set to about 2 mm.
Vacuum cleaner suction tool set to. 8. An electric motor having a suction tool main body having a suction port opened on a lower surface thereof, and a rotating brush rotatably provided facing the suction port, wherein the electric motor rotatably drives the rotating brush inside the rotating brush. A suction device for a vacuum cleaner, wherein a power transmission device for transmitting rotation of the electric motor to the rotary brush is provided, and an output shaft constituting the power transmission device is formed of a material having a lower thermal conductivity than iron. 9. A vacuum cleaner body having a dust collecting chamber and a conduction blower for collecting dust therein so as to communicate with the vacuum cleaner suction tool according to any one of claims 1 to 8. Vacuum cleaner with a connection port to be connected to.