JPH0654780A - Vacuum cleaner suction port - Google Patents

Abstract

(57) [Abstract] [Purpose] The free end of the rotating shaft of the electric motor is supported, and the eccentricity and deformation of the rotating shaft due to the force applied through the belt when the rotating brush receives a large resistance and the overload on the electric motor are prevented. The purpose is to prevent. [Structure] A rotary brush 2 is rotatably provided in a suction port main body 1, and an electric motor 3 for rotationally driving the brush 2 via a belt 36 is fixedly provided, and a rotary shaft 33 of the electric motor 3 is provided.
Belt 36 is stretched between the shaft 24 of the brush 2 and the end of the rotary shaft 33 of the electric motor 3 is supported by the bearing assembly 37,
The pulley 34 is provided between the electric motor 3 of the rotating shaft 33 and the bearing assembly 37.
Is provided. Then, the bearing assembly 37 receives a force applied to the rotating shaft 33 of the electric motor 3 via the belt 36 to pull it toward the brush 2 side, and suppresses the deviation and deformation of the rotating shaft 33 and the load applied to the electric motor 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a rotary brush rotatably in a suction port main body, and an electric motor for rotating and driving the rotary brush via a belt, which is fixed to the rotary shaft of the electric motor. The present invention relates to a suction port of an electric vacuum cleaner in which the belt is stretched between the rotary brush shaft and the shaft.

[0002]

2. Description of the Related Art A suction port of this type is disclosed in Japanese Patent Laid-Open No. 60-176.
As in Japanese Patent No. 618, a rotary brush is rotatably provided in a suction port body, an electric motor is fixedly provided in the suction port body, and a belt is provided between a rotary shaft of the electric motor and the shaft of the rotary brush. It was constructed by stretching. Then, the rotation of the electric motor is transmitted to the rotary brush by the belt to rotate the rotary brush, and the rotation of the rotary brush effectively scrapes dust from the carpet, thereby effectively cleaning the carpet. .

[0003]

At the suction port, it is necessary to apply a certain amount of tension to the belt in order to transmit the rotational force of the electric motor to the rotating brush, but to clean the carpet with long bristles. Since the rotating brush receives a very large resistance when the suction port is pressed firmly against the carpet, the force applied to the rotating shaft of the electric motor through the belt to pull the rotating shaft toward the rotating brush becomes a very large force. In addition to the usual load due to the carpet, the electric motor may overload due to the additional load due to the free end of the rotating shaft being pulled toward the rotating brush and the center of rotation of the rotating shaft being eccentric. There is a problem in that a large load current flows through the electric motor due to overload, and the electric motor is abnormally heated and damaged.

If the force applied to the rotary shaft of the electric motor via the belt toward the rotary brush becomes extremely large, the rotary shaft of the electric motor may be deformed. When the rotary shaft is deformed, the rotary shaft is deformed. The distance between the rotating brush and the shaft of the rotating brush changes, the tension of the belt weakens, the belt spins idle, the rotation of the electric motor is not reliably transmitted to the rotating brush, and the rotating brush does not rotate. There was a problem of disappearing.

[0005]

DISCLOSURE OF THE INVENTION The present invention is to solve the above-mentioned problems. A rotary brush is rotatably provided in the suction port main body, and an electric motor for rotating the rotary brush via a belt is fixed. The belt is stretched between the rotary shaft of the electric motor and the shaft of the rotary brush, and the end of the rotary shaft of the electric motor is supported by a bearing assembly. A pulley for stretching the belt is provided between the pulley and the product.

[0006]

With the above-mentioned suction port, when the rotary brush is strongly pressed against the carpet surface or receives a large force due to the long hair of the carpet, the rotary shaft of the electric motor moves through the belt and pulley to the rotary brush side. Although it is pulled by a large force, the end of the rotary shaft is supported by the bearing assembly, and the force applied to the rotary shaft is received by the bearing assembly, and the load applied to the electric motor is suppressed.

[0007]

Embodiments of the present invention shown in the drawings will be described in detail below. Suction port body 1 has upper case 5 and lower case 6
The cover 7 constitutes an outer shell, and a rear end portion is provided with a vertically rotatable drive pipe 8, and a rotatable suction pipe 9 is connected to the tip end thereof.

The lower case 6 acts as a sled for a carpet, and has a horizontally long dust collecting opening 10 formed in the front portion of the lower surface thereof, and a rubber sealing material 1 behind the opening 10.
1 is arranged in the lateral direction. The lower case 6 is provided with rollers 12 on the front surface of the lower surface and wheels 13 on the rear surface so that a constant gap is formed between the lower surface of the lower case 6 and the floor surface by the rollers 12 and the wheels 13. Has become.

Inside the suction port body 1, the rotating brush chamber 14 and the brush chamber 1 are formed by coupling the upper case 5 and the lower case 6 together.
4 is formed to communicate with the drive pipe 8 side, and the rotating brush chamber 14 and the communication passage 15 form a dust suction passage from the dust suction opening 10 to the drive pipe 8.
Further, mechanism chambers 16 and 17 are formed on both sides inside the suction port body 1, and inside the motor chamber 1 on both sides of the communication path 15.
8 and an outlet storage room 19 are formed, and each room 1
6 to 19 are appropriately divided with respect to the dust suction passage.

The opening 20 of the upper case 5 is provided in the rotary brush chamber 1
This is for facilitating the removal of lint and the like that face the rotating brush 2 and are entangled in the rotating brush 2, and are normally closed by a removable cover 7. The bumper 21 is sandwiched between the cases 5 and 6 and is located on the outer periphery of the suction port body 1, and has a function of sealing the coupling surfaces of the cases 5 and 6 and a function of buffering obstacles.

The rotary brush 2 has a structure in which a beater 22 and brush bristles 23 are provided on the outer peripheral surface in a single or plural spiral shape. The rotary brush 2 is inside the rotary brush chamber 14 and the shafts 24 at both ends are inside the machine chambers 16 and 17. The bearing assembly 2 in the chambers 16 and 17
It is rotatably supported by 5.

The bearing assembly 25 comprises a bearing 26, a bearing holder 27, and an elastic body 28 interposed therebetween.
It is held in the machine chambers 16 and 17 so as to be vertically movable. That is, the lower case 6 forming the machine rooms 16 and 17
A pair of ribs 29, 29 facing each other on one side are integrally formed, and the bearing assembly 25 is formed in the groove 30 between the ribs 29, 29.
Is positioned so that the assembly 25 can move up and down along the groove 30. Therefore, the rotary brush 2 pivotally supported by such a bearing assembly 25 is also provided so as to be vertically movable, and the rotary brush 2 normally has its own weight and the spring 31.
Positioned at the bottom by the action of. The rotating brush chamber 14
The partition wall between the machine chambers 16 and 17 is provided with an opening 32 through which the end of the rotary brush 2 is inserted and which allows the rotary brush 2 to move up and down.

The electric motor 3 is an AC magnet electric motor which is suitable for reducing the size and weight of the suction port. The electric motor 3 is supported by a supporting portion 53 and fixed in the electric motor chamber 18, and its rotary shaft 33 is fixed in the machine chamber. A transmission mechanism 4 is provided between the rotary brush 2 and the shaft 24 of the rotary brush 2 in the machine chamber 16.

The transmission mechanism 4 comprises a pulley 34 provided on the rotary shaft 33 of the electric motor 3, a gear pulley 35 provided on one shaft 24 of the rotary brush 2, and a timing belt 36 stretched between the pulleys 34 and 35. , The rotation of the electric motor 3 is transmitted to the rotating brush 2. The rotation direction of the electric motor 3 is set counterclockwise as viewed from the pulley 34 side so that the rotating brush 2 rotates in accordance with the traveling direction when cleaning.

The electric motor 3 is installed in the machine room 17.
The bearing assembly 37 that supports the free end side of the rotating shaft 33 through the pulley 34 is provided. The electric motor 3 has ventilation holes in the front and rear parts, and has a structure in which air can flow through the ventilation holes.

The inlet main body 1 has an outlet 38 housed in an outlet storage chamber 19 and its connection surface is exposed to the outside surface. From the outlet 38, a positive temperature coefficient thermistor 39,
Electric power is supplied to the electric motor 3 via the resistor 40. The positive temperature coefficient thermistor 39 protects the electric motor 3 when the load current exceeds a certain value, the resistance value suddenly increases due to self-heating, and the electric motor 3 is stopped. Also, the resistor 40 is AC 1
It is a resistor for voltage drop for decompressing 00V and applying it to the electric motor 3.

In the figure, 41 is a capacitor for preventing radio interference,
42 is a full-wave rectifier built in the electric motor 3. The resistor 40 is held by a passage cover 43 provided across the upper part of the communication path 15, and the cover 43 houses the resistor 40 in a space defined by the communication path 15.

In FIG. 1, arrows indicate the flow of cooling air, and this flow will be described. This flow of the cooling air is generated by the operation of the electric blower in the main body of the vacuum cleaner described later, and outside air enters the electric motor chamber 18 from the air holes (not shown) also received in the upper case 5 near the electric motor 3. Entering, passing through the inside of the electric motor 3 and the resistor 40, the connecting path 15
It flows from a through hole (not shown) in the wall to the dust collecting passage, and cools the electric motor 3 and the resistor 40. Therefore, an inexpensive cement resistor or the like can be used as the resistor 40, and of course, the problem due to heat generation does not occur.

FIG. 5 is a view showing the use state of the suction port,
44 is a cleaner body, 45 is a suction hose, 46 is an extension tube,
Reference numeral 47 is a hand switch provided on the bent pipe portion 48 of the suction hose 45, 49 is an outlet provided on the bent pipe portion 48, 50 is a power cord connecting the outlets 38 and 49, and 51 is an alternating current provided on the cleaner body 44. An outlet for taking out 100V, and a power cord 52 for connecting to the outlet 51 and supplying power to the suction port body 1 side.

In the above structure, one end of the extension pipe 46 is connected to the suction pipe 9 of the suction port main body 1, and the other end of the extension pipe 46 is connected via the suction hose 45 to the cleaner main body 44.
With the power cord 50 connected to the outlet 38,
At 49, another power cord 52 is connected to the outlet 51 (see FIG. 5).

When the cord pulled out from the cleaner main body 44 is connected to a power outlet and the hand switch 47 is turned on the floor / tatami side, only the electric blower of the cleaner main body 44 is supplied with power to collect dust. Will be done.

When the hand switch 4 is turned on to the carpet side, AC 1 is applied to the outlet 38 side together with the electric blower.
00V is applied. Then, the electric motor 3 is driven by being supplied with electric power through the resistor 40, and rotationally drives the rotary brush 2 via the transmission mechanism 4. In this state, the carpet cleaning can be effectively performed by the scraping action by the rotation of the rotary brush 2 and the suction action of the air flow flowing from the dust suction opening 10 through the rotary brush chamber 14 and the communication path 15 by the electric blower. .

Carpet cleaning is performed by moving the suction port body 1 onto the carpet, and at this time, the rotating brush 2 automatically adjusts the resistance received by the vertical movement to keep the load applied to the electric motor 3 small. Become. That is, when the carpet has a long bristle or is pressed strongly against the carpet surface, the rotating brush 2 receives a very large resistance. At this time, the bearing assembly 25 supporting the rotating brush 2 is placed in the groove 30. Since it can be moved up and down, the rotating brush 2 is retracted from the carpet surface by upward movement (moving diagonally upward in this embodiment) and automatically adjusted so as to reduce the resistance received.

As a result, the load applied to the electric motor 3 is suppressed to a low level, and the increase in load current is also suppressed. Therefore, even if an AC magnet electric motor is used as the electric motor 3, the carpet cleaning can be performed without any trouble in practical use.

When the rotating brush 2 is loaded with a large load that cannot be absorbed and the motor 3 is locked, an overload current will flow. At this time, the positive temperature coefficient thermistor 39 functions as a safety device. , Protect the electric motor 3.

In the above embodiment, the bearing assembly 25 is urged downward by the spring 31, but this spring 31
Can be omitted. However, when the rotary brush 2 is positioned at the lowermost position only by its own weight, imbalance is likely to occur during rotation, which causes noise and vibration. It is desirable to always apply a constant load.

[0027]

Since the suction port of the electric vacuum cleaner of the present invention has the above-described structure, the end of the rotary shaft of the electric motor 3 is supported by the bearing assembly to clean a carpet with long hair. When the suction port is strongly pressed against the carpet, the bearing assembly receives the force pulled to the rotating brush side through the belt given to the rotating shaft of the electric motor, and the rotating shaft of the electric motor is biased from the center of rotation. It is possible to prevent the motor from rotating, reliably prevent an overload applied to the motor due to the deviation of the rotating shaft of the motor, prevent abnormal heat generation due to the overload current, and prevent damage to the motor.

Further, deformation of the rotating shaft of the electric motor can be reliably prevented, idling of the rotating shaft can be prevented due to insufficient tension of the belt, and rotation of the electric motor can be reliably transmitted to the rotating brush. , Carpet cleaning with a rotating brush can be performed reliably.

[Brief description of drawings]

FIG. 1 is a plan view showing a suction port in an embodiment of the present invention and a part of which is shown in cross section except for an upper case.

FIG. 2 is a sectional view taken along the line AA ′ of FIG.

3 is a sectional view taken along line BB ′ of FIG.

FIG. 4 is an electric circuit diagram of the suction port of the present invention.

FIG. 5 is a diagram showing a usage state of the suction port of the present invention.

[Explanation of symbols]

 1 Suction Port Main Body 2 Rotating Brush 3 Electric Motor 4 Transmission Mechanism 34 Pulley 37 Bearing Assembly

Claims (1)

[Claims] 1. A rotary brush is rotatably provided in the suction port main body, and an electric motor for rotationally driving the rotary brush via a belt is fixedly provided, and a rotary shaft of the electric motor and a shaft of the rotary brush are provided. At the suction port of the electric vacuum cleaner with the belt stretched between, the end of the rotary shaft of the electric motor is supported by a bearing assembly, and the belt is stretched between the electric motor of the rotary shaft and the bearing assembly. The suction port of the vacuum cleaner is characterized by having a pulley.