JPS63229017A - Electromotive floor sucking jig - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric floor suction device equipped with a rotating brush rotated by an electric motor.

2. Prior Art Conventionally, this type of electric floor suction tool has generally had a configuration in which a rotating brush is driven by an electric motor via a belt, but a configuration as shown in Japanese Patent Application Laid-open No. 56-43922 has been developed. were also considered.

The configuration will be described below with reference to the drawings.

In FIG. 6, reference numeral 1 denotes a main body having a suction port on the bottom and a connecting vibrator 2 at the rear for connection to a vacuum cleaner via a hose or the like, and has an outer rotor type electric motor 3 built therein. 4 is an armature attached to a fixed shaft 5 supported by the main body 1; 6 is an inner surface of a rotating brush 9, which is rotatably provided on the outer periphery of the fixed shaft 6 via a bearing 7 and has brush bristles 8 implanted therein; The rotor is fixed to the 1o is a lead wire led out from the coil portion of the armature 4, and exits to the outside via the fixed shaft 5.

Problems to be Solved by the Invention In such a conventional electric floor suction device, the rotating brush 9
Although the electric motor 3 was built inside, the electric motor 3 was installed in a sealed state to prevent breakdowns due to intrusion of dust, so cooling air did not flow to the electric motor 3 in the rotating brush 9, and air was generated from the electric motor 3. The heat was only dissipated by heat conduction through the fixed shaft 6 and the rotating brush 9. Moreover, armature 4
The temperature of the coil will rise significantly, and if used continuously, abnormalities such as thermal deformation of the resin parts and burnout of the coil will occur.
The lifespan of the product is short and there is a risk of fire.
There were problems with safety and durability.

The present invention solves these problems, and provides an electric floor suction tool that reduces the temperature rise of the electric motor, improves durability, and is miniaturized and has improved dust collection performance. The purpose is to

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention disposes an electric motor as a drive source and a planetary gear inside a rotating brush, and a fixed shaft that supports one end of the rotating brush and the electric motor is hollow. The inside of the rotating brush is formed to communicate with the outside of the suction tool main body, and the other end of the electric motor is supported by a support member disposed between the electric motor and the planetary gear, and the meshing portion of the planetary gear is covered.
A concave and convex portion is formed in the direction of the inner circumferential axis of the rotating brush, and a flow path for cooling airflow is provided on the outer circumference of the planetary gear.

Function: With the above-described configuration, the present invention uses the suction force of the vacuum cleaner body or the rotational force of the rotating brush to generate airflow inside the rotating brush that is communicated with the outside of the suction tool body, thereby cooling the electric motor. At the same time, by covering the meshing portions of the planetary gears and flowing cooling air around the outer periphery of the planetary gears, it is possible to prevent fine dust from entering the inside of the planetary gears and to securely hold the electric motor.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings. In FIGS. 1 to 4, reference numeral 11 denotes a rotating brush 12 that releases dust attached to a surface to be cleaned such as a carpet.
The main body of the suction tool has a suction port built-in, and is rotatably equipped with a suction port on the bottom surface and a connection pipe 16 connected to an extension pipe 13 and communicated with the vacuum cleaner main body 16 via a hose 14 at the rear part.

Brush bristles 17 are implanted on the outer peripheral surface of the rotating brush 12,
Inside there is an electric motor 18 that is a driving source for the rotating brush 12,
A planetary gear 19 that is inserted into the shaft of the electric motor 18 and decelerates the rotation and transmits it to the rotating brush 12, and a support member 2o that is disposed between the electric motor 18 and the planetary gear 19 are built in. This support member 2° is fixed to the electric motor 18 with a plurality of screws 21, and the end surface that comes into contact with the electric motor 18 has grooves 23 for improving heat dissipation by improving ventilation from cooling holes 22 provided in the electric motor 18. The other end face is fitted into the inner ring 24 of the planetary gear 19, and the other end face is fitted into the inner ring 24 of the planetary gear 19.
Covers 9 surfaces. Further, on the inner circumferential surface of the rotating brush 12, a key groove 26 into which a convex portion 25 protruding from the outer ring of the planetary gear 19 is fitted, and four portions 27 forming a cooling air flow path are provided in the axial direction. A lid 29 equipped with a bearing 28 is inserted into the openings at both ends. Reference numeral 30 denotes a hollow fixed shaft, one end of which protrudes to the side of the rotating brush 12, rotatably supports the rotating brush 12 via a bearing 28, and serves as a lead for a power cord 31 connected to the electric motor 18. A wire 32 is passed through the hollow part, and the other end is formed into a cylindrical shape and is disposed inside the rotating brush 12 to support the outer periphery of the electric motor 18. 3
Reference numeral 3 designates fixed covers that are inserted at both ends of the rotating brush 12 to prevent dust from entering the rotating brush 12 and the bearing 28. The rotating brush 12 is connected to the fixed cover 33 and the fixed shaft 3o
The rotating brush 12 is supported by the side wall 34 and the ribs 36 of the suction device main body 11 via the main body 11, and is provided at approximately the center of the rotating brush 12 facing the intake port 36 of the connecting pipe 16. A ventilation hole 37 is formed.

Reference numeral 38 denotes a leak hole that allows external air to cool the electric motor 18 to communicate with the inside of the rotating brush 12 through the hollow part of the fixed shaft 3o, and is formed on the side surface of the suction tool main body 11. 39 is a bumper that prevents furniture from being scratched, 40 is a power cord 3
1 is a cord bushing for fixing to the suction device main body 11, 41 is a cord stopper for attaching the power cord 31 to the extension tube 13 in a detachable manner, and 42 is a switch for detachably attaching the power cord 31.

To explain the operation in the above configuration, when the suction device main body 11 and the vacuum cleaner main body 15 are energized, the electric motor 18 rotates, the rotational torque is increased while being decelerated by the planetary gear 19, and the rotation is transmitted to the rotating brush 12. The bristles 17 scrape out dust adhering to a carpet or the like, and the scraped dust is sucked into the cleaner body 16 via the extension tube 13 and hose 14. At this time, what is rotated by the electric motor 18 is the planetary gear 19, the rotating brush 12, and the lid 29.
The electric motor 18, the fixed shaft 30, the fixed cover 33, and the lead wire 32 are fixedly held on the suction tool main body 11 only by the outer ring of the bearing 28.

Furthermore, when the suction port on the bottom of the suction device main body 11 is pressed against the floor surface and the vacuum cleaner main body 16 is connected, negative pressure is applied to the space surrounded by the suction device main body 11 and the floor, and the outer periphery of the suction device main body 11 is The outside air flows into the intake port 36 of the tangential pipe 16, and this airflow also carries the dust on the floor into the intake port 36.
However, at this time, negative pressure also acts near the ventilation hole 37 inside the rotating brush 12 through the ventilation hole 37 provided opposite the intake port 36, so that the hollow fixed shaft 30 and the leakage hole 38 are A pressure difference is generated between the outside of the suction tool main body 11 and the side part of the rotary brush 12 which is communicated with the outside air through the leak hole 32 and the inside of the rotary brush 12 through the middle part of the fixed shaft 30. An airflow is generated that flows into the air, passes around the electric motor 18, flows toward the ventilation hole 3, and flows out through the ventilation hole 37 toward the air intake port 36, which has a lower air pressure than the inside of the rotating brush 12.

At this time, since the surface of the planetary gear 190 is covered by the support member 2o, the cooling air flow containing fine dust is transferred to the planetary gear 190.
, and flows through a passage formed on the outer periphery of the planetary gear 19. Therefore, it is possible to prevent fine dust from entering the meshing portion of the gears inside the planetary gear 19, to prevent the planetary gear 19 from locking or seizing, and to extend the life of the planetary gear 19.

Furthermore, by supporting the other end of the υ motor 18 on the planetary gear 19 by the support member 20, it is possible to prevent shearing force or bending load from being applied to the shaft of the motor 18 that is low-fitted to the planetary gear 19. The temperature rise of the shaft 18 is reduced, efficiency is improved, and deformation and fatigue damage of the shaft can be prevented.

Furthermore, by forming the grooves 23 in the support member 20 to encourage discharge of the cooling airflow from the θ cooling holes 22, the temperature rise of the electric motor 18 is further reduced.

Effects of the Invention As is clear from the above embodiments, the electric floor suction tool of the present invention communicates the inside of the rotating brush containing the electric motor and the planetary gear with the outside of the suction tool main body, and the space between the planetary gear on the motor By supporting the other end of the motor and covering the planetary gear, and forming a flow path for the cooling airflow around the outer circumference of the planetary gear, the cooling airflow is applied to the meshing part of the gears inside the planetary gear. This prevents fine dust from entering and prevents planetary gears from locking or seizing. It also reduces the load on the motor by removing shearing force and bending load on the motor shaft, and reduces temperature rise. It is possible to prevent deformation and fatigue damage of the shaft, and greatly improve durability and safety.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of an electric floor suction tool showing an embodiment of the present invention, Fig. 2 is an exploded perspective view of the same rotating brush, Fig. 3 is a vertical sectional view of the rotating brush, and Fig. 4 is FIG. 5 is a perspective view showing the overall configuration, and a sectional plan view of a conventional electric floor suction tool. 11...Suction tool body, 12...Rotating brush, 15...Vacuum cleaner body, 18...Electric motor, 19...Planetary gear, 20...Supporting member, 27...1. Recessed portion, 30...Fixed shaft, 37...Vent hole, 38...Leak hole.

Claims (1)

[Claims] An electric motor as a drive source, a planetary gear that transmits the rotation of this electric motor, and a rotary brush that incorporates a fixed shaft that supports one end of this electric motor are rotatably provided in the suction device main body, and the fixed shaft is hollow. The inside of the rotating brush communicates with the outside of the suction tool main body, and the other end of the motor is supported by the planetary gear by a support member disposed between the motor and the planetary gear, and the planetary gear is covered to prevent further rotation. An electric floor suction tool in which an axial recess is formed on the inner peripheral surface of the brush and a passage for cooling air is arranged around the outer periphery of the planetary gear.