JPH055276Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an electric blower used in a vacuum cleaner.

2. Description of the Related Art Conventionally, an electric blower used in a vacuum cleaner has a structure as shown in FIGS. 4 and 5, as shown in, for example, Japanese Patent Publication No. 18764/1983.

That is, the motor 21 has a load side bracket (made of metal) 22 and an anti-load side bracket (made of metal).
23 forms the outer shell. 24 is a stator, 25 is a rotor, and this rotor 25 is rotatably supported via a shaft 26. This shaft 26 protrudes toward the load side bracket 22, and is connected to the rotating fan 2 by a nut 27.
8 is fixed. An air guide 29 is attached to the outer periphery and below the rotating fan 28 , a casing 30 covers the front of the rotating fan 28 , and an air intake port 31 is opened in the center of the casing 30 relative to the intake port of the rotating fan 28 . There is. The load side bracket 22 has an opening 32 that is connected to the opposite load side bracket 2.
3 has an exhaust port 33 open therein.

Further, the anti-load side bracket 23 is provided with a pair of brushes 34. This brush 34 includes a carbon brush 36 that is slidably installed in a deformed tube 35, and a carbon brush 36 that is connected to the shaft 2.
The brush holder 39 is fixed to the anti-load side bracket 23 with a rivet (not shown) or the like, together with a brush holder 39.

Note that when this brush 34 is stored, as shown in FIG.
It is pushed out by the deformed tube 35.

Problems to be Solved by the Invention In the brush structured as described above, the carbon brush 36 is in a state of being largely protruded from the front of the irregularly shaped tube by the spring 38. Therefore, when assembling this brush into an electric blower, the tip of the carbon brush is unstable, making it difficult to assemble the brush.

Furthermore, when storing the brushes, there was a risk that the protruding carbon brushes would hit other carbon brushes or other objects, resulting in cracks or chips on the end faces of the carbon brushes. When an electric blower is operated after assembly using such a cracked or chipped carbon brush, abnormal sparks are generated, resulting in a decrease in performance.

The purpose of the present invention is to solve the above-mentioned difficulties and to provide an electric blower with a brush that is easy to assemble into the electric blower and that can prevent the carbon brush from cracking or chipping when the brush is stored. do.

Means for Solving the Problems In order to achieve the above object, the present invention includes a stator and a rotor, a fan that rotates together with the rotor, an air guide that holds a bearing on the load side of the rotor, and an air guide on the non-load side of the rotor. An anti-load side bracket that holds the bearing part, a commutator that rotates together with the rotor, and a commutator that is slidably provided in a deformed tube held by the anti-load side bracket and is pressed in the direction of the commutator by a spring. a pair of brushes having carbon brushes,
At the front end of the irregularly shaped tube, one or more stoppers cut and raised in a plate shape around the shaft support are provided so as to be rotatable on the shaft support, one end of the stopper prevents the carbon brush from popping out, and the other end of the stopper is rotatable on the shaft support. The electric blower is arranged so that when the end of the brush comes into contact with a wall surface provided on the brush holding portion of the anti-load side bracket and rotates, the protrusion prevention is released.

Function In the brush of the present invention, the carbon brush that is slidably provided in the irregularly shaped tube is pushed forward by a spring, and a plate is attached to the front end of the irregularly shaped tube around the shaft support. 1 cut and raised in the shape of
One or more stoppers are provided, and one end of the stopper presses the tip of the carbon brush to prevent it from popping out. When assembling this brush into an electric blower, the other end of the stopper is pushed by the wall surface of the brush holding part of the anti-load side bracket, so the stopper rotates on the shaft support to release the carbon brush from popping out and move forward. It starts to jump out. In this way, when the brush is stored, the carbon brush is housed in the irregularly shaped tube, which prevents the carbon brush from cracking or chipping, and improves the ease of assembling the brush.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings.

In Figure 1, 1 is the rotor, and the shaft 2
It is rotatably supported around the center. Bearings 3 are press-fitted into both ends of the shaft 2, and the bearing portion on the opposite load side is supported by a bracket 4 on the opposite load side. This anti-load side bracket 4
is approximately cylindrical, and holds the brush 5 at its end. Reference numeral 6 denotes an exhaust port, which opens on the anti-load side bracket. Further, the anti-load side bracket 4 holds the outer periphery of the stator 7 at its center.

In the load side bearing section, a bearing 3 press-fitted into the shaft 2 of the rotor 1 is supported by an air guide 8, and the air guide 8 and the anti-load side bracket 4 are fastened with screws 9 or the like. Preferably, the air guide and the anti-load side bracket are made of synthetic resin.

On the load side of the rotor 1, a shaft 2 projects through an air guide 8, and a fan 10 is fixed thereto with a nut 11 so as to rotate together with the rotor 1. A casing 12 covers the outside of the fan 10, and an intake port 13 is opened in the center of the casing 12, facing the intake port of the fan 10. Furthermore, a commutator 14 is provided on the opposite load side of the shaft 2.
is fixed and rotates together with the rotor 1.

The brush 5 is attached to a deformed tube 1 as shown in FIG.
5, a carbon brush 16 that is slidable within the irregularly shaped tube 15, a spring 17 for bringing the carbon brush 16 into pressure contact with the commutator 14, and the irregularly shaped tube 15.
It is composed of a pigtail 18 that connects the carbon brush 16 with the carbon brush 16, and a stopper 19 rotatably provided at the front end of the irregularly shaped tube 15.
This stopper is cut and raised into a plate shape around the shaft support 19a, one end 19b abuts the front surface of the carbon brush 16, and the other end 19c projects outward from the shaft support 19a.

With the above configuration, when the rotor 1 rotates due to energization, the fan 10 rotates. Due to this rotation, air is sucked from the intake port 13 of the casing 12 into the intake port of the fan 10, is discharged from the outer periphery of the fan, enters the inside of the motor through the air guide 8, cools the rotor 1 and stator 7, and counteracts the load. It is discharged through the exhaust port 6 of the side bracket 4.

Next, the action of the brush 5 of the present invention will be explained.

As shown in FIGS. 2 and 3, when the brush 5 is stored, the carbon brush 16 has a stopper 19 cut into a plate shape at the front end of the irregularly shaped tube 15 around the shaft support 19a, as shown by the solid line. One end 19b of the carbon brush 16 is brought into contact with the carbon brush 16 to prevent the carbon brush 16 from popping out.

Therefore, before the brush 5 is assembled, the carbon brush 16 is housed in the deformed tube 15, so that cracking or chipping of the carbon brush 16 can be prevented.

Next, when assembling the brush 5, when the brush is inserted in the direction of arrow A, the wall surface 2 provided on the brush holding portion of the anti-load side bracket 4 formed of synthetic resin
0, the other end 19c of the stopper 19 abuts. If the brush 5 is continued to be inserted, the other end 19c of the stopper 19 will be pushed in the direction of arrow B. Since the stopper 19 is rotatably formed on the shaft support 19a, the one end 19b will be pushed in the direction of the arrow B.
will move in the direction of arrow C.

When it is further inserted and one end of the stopper 19 comes to the vicinity of the position shown by the dotted line, the stationary state of the carbon brush 16 is released and the carbon brush 16 is pushed out in the direction of arrow D by the force of the spring 17, and the commutator 14.

Further, by bending the tip of one end 19b of the stopper 19, the carbon brush 16 can be pushed out smoothly after the brush 5 is assembled.

Also, while inserting brush 5, carbon brush 1
The wall surface 20 formed on the brush holding portion of the anti-load side bracket 4 is preferably formed at a location slightly deeper than the outer peripheral surface of the anti-load side bracket 4 so that the brush holding portion 6 protrudes.

According to the above configuration, when the brush 5 is stored before being assembled, the carbon brush 16 is attached to the irregularly shaped tube 1.
5 to prevent cracking or chipping, and the carbon brush 16 will pop out when assembled into the electric blower.
It has become easier to handle and easier to assemble.

Effects of the invention As described above, the present invention has a rotatable stopper at the front end of the irregularly shaped tube that constitutes the brush, so when the brush is stored, the carbon brush can be stored in the irregularly shaped tube. This prevents the carbon brush from popping out of the irregularly shaped tube and prevents the carbon brush from cracking or chipping. Furthermore, when assembling the brush into the electric blower, the stopper engages with the brush holding part and rotates, causing the carbon brush to protrude from the irregularly shaped tube and come into contact with the commutator, improving assembly efficiency. It is.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an electric blower showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the brush of the invention, Fig. 3 is an enlarged perspective view of the same main part, and Fig. 4 is a diagram of a conventional electric blower. The partial sectional view shown in FIG. 5 is an enlarged sectional view of a conventional brush. 1... Rotor, 4... Anti-load side bracket,
7... Stator, 10... Fan, 14... Commutator, 15... Irregular tube, 16... Carbon brush, 17... Spring, 19... Stopper,
19a...Axis support, 19b...One end, 19c...
...The other end, 20...wall surface.

Claims (1)

[Scope of utility model registration request] A stator and a rotor, a fan that rotates together with the rotor, an air guide that holds the load side bearing of the rotor, an anti-load side bracket that holds the anti-load side bearing of the rotor, and a rectifier that rotates together with the rotor. and a pair of brushes having carbon brushes that are slidably provided within the irregularly shaped tube held by the anti-load side bracket and are pressed by a spring in the direction of the commutator. One or more stoppers cut and raised in a plate shape around the shaft support are provided at the front end of the carbon brush so as to be rotatable on the shaft support, one end of the stopper prevents the carbon brush from jumping out, and the other end of the stopper An electric blower, characterized in that the electric blower is arranged so as to release the protrusion prevention when it comes into contact with a wall surface provided on a brush holding portion of the anti-load side bracket and rotates.