JP2523437Y2 - Commutator motor - Google Patents

Description

The present invention relates to a commutator motor used for a vacuum cleaner or the like.

2. Description of the Related Art Conventionally, a commutator motor of this type has a structure as shown in FIG.

In other words, the stator 1 and the rotor 2 are built in, and the air guide 4 holds the load-side bearing 3 of the rotor 2 and the bracket 5 holds the non-load-side bearing 3. A deformed pipe 7 containing a brush 6 was held, and a contact spring 9 provided on a resin winding frame 8 constituting the stator 1 was in contact with the deformed pipe 7.

Problems to be Solved by the Invention In the case of a commutator motor having such a structure, when a deformed tube having a built-in carbon brush is press-fitted into a bracket, a substantially L provided on a winding frame formed of a resin material constituting a stator is provided. A U-shaped contact spring comes into contact with the upper surface of the deformed tube. However, when attaching such a contact spring to the bobbin, the attachment accuracy is required, and if it is attached at an angle, sufficient contact pressure cannot be obtained,
There was a risk of poor conduction. Further, the contact spring may be deformed during storage and distribution of the stator, and it is difficult to ensure quality.

Means for Solving the Problems The present invention, in order to solve the above problems, incorporates a stator and a rotor, an air guide that holds a load-side bearing of the rotor, a bracket that holds a non-load-side bearing, A deformed pipe having a pair of carbon brushes built therein and held below the bracket, and a bridge-type contact spring abutting on a contact terminal provided on a resin winding frame constituting the stator; one end of the contact spring; Is open and the other end is fixed to the upper surface of the deformed tube, and the open end of the contact spring is pressed against the upper surface of the deformed tube.

According to the present invention, the bridge type contact spring formed on the upper surface of the bracket is inserted into the contact terminal provided on the resin winding frame constituting the stator when the deformed tube is inserted into the bracket. The contact spring is bridge-type and is supported at two points and is strong in strength. It can prevent deformation of the contact during storage or transportation of the deformed tube, and does not require much precision in fixing the contact. Easy to assemble,
Because of the bridge structure, there is no need to increase the plate thickness to increase the contact pressure, and costs can be reduced. Also, since the open end side of the contact spring is pressed against the upper surface of the deformed pipe, a reaction force is obtained from both ends of the contact spring, and the contact spring is pressed against the contact terminal with a large force, and electrical connection is made. Is performed reliably.

Embodiment The embodiment will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 10 denotes a rotor. Bearings 12 are press-fitted on both sides of a shaft 11, and the bearing 13 is held by an air guide 13 made of resin on the load side, and made of resin on the non-load side. It is held by the bracket 14. The bracket 14 holds the outer periphery of the stator 15 at the center and has an exhaust port 14a opened at the lower part. Below the bracket 14, a deformed pipe (metal) 17 containing a pair of carbon brushes 16 is held by press fitting. A boss 18a is formed on a resin winding frame 18 constituting the stator 15, and a contact terminal 19 is held there. A bridge-type contact spring 20 is fixed on the upper surface of the deformed pipe 17 at a point A, and is opened at a point B.

On the load side of the rotor 10, a shaft 11 protrudes through the air guide 13, and a fan 21 is fixed thereto by a nut 22 and rotates together with the rotor 10.

A casing 23 covers an upper part of the fan 21, and an intake port 23 a is opened at a central portion thereof so as to face the intake port 21 a of the fan 21.

In the above configuration, when the rotor 10 is rotated by energization, the fan 21 rotates with the rotation of the rotor 10, and air is sucked into the suction port 21a of the fan 21 from the suction port 23a of the casing 23 and discharged from the outer periphery of the fan 21. Air guide
From 13 enter the motor interior, rotor 10, stator 15
Is cooled and discharged from the exhaust port 14a of the bracket 14.

A bridge-type contact spring 20 formed on the upper surface of the deformed tube 17 held below the bracket 14 is
By contacting the contact terminal 19 fixed to the boss 18a provided on the stator 18, the stator 15 and the deformed tube 17 can be conducted, and the deformed tube 17 and the rotor 10 are conducted through the carbon brush 16, so that the rotor The connection between the stator 10 and the stator 15 is made by the contact terminal 19 and the contact spring 20.

During storage or transportation of such a deformed tube 17, the contact spring 20 has a bridge structure so that it is difficult to be deformed, and conduction failure due to the deformation of the contact spring 20 can be eliminated. As shown in FIG. 2, if only one of the dimensions A and B is used, even if the other dimension is small, it can be deformed as shown by a dotted line and brought into contact with the contact terminal 19. As much as possible, sufficient contact pressure can be obtained. Also, even if either dimension is large,
Since the point B is open, it can be similarly deformed as shown by a dotted line and contact the contact terminal 19.

In this way, even if the A dimension and the B dimension vary somewhat, the contact can be reliably made with a sufficient contact pressure, and the quality of the contact can be remarkably improved.

In addition, when the deformed pipe 17 is inserted, since the contact portion of the contact spring 20 is long, the contact portion can be reliably cleaned, and the quality can be further improved.

As described above, according to the present invention, the bridge-type contact spring is fixed to the upper surface of the deformed pipe, thereby preventing the deformation of the contact spring during storage and transportation of the deformed pipe and reducing the mounting dimension. Even if there is some variation, the contact can be reliably brought into contact with the contact terminal with a sufficient contact pressure, and the reliability of the contact can be significantly improved. Further, since the open end of the contact spring is pressed against the upper surface of the deformed pipe, the contact spring can be pressed against the contact terminal with a large force, and the electrical connection can be reliably performed. In addition, the contact portion can be sufficiently cleaned, and the quality can be further improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a commutator motor showing an embodiment of the present invention, FIG. 2 is a side view of a brush portion, and FIG. 3 is a sectional view of a conventional example. 10 …… Rotor, 12 …… Bearing, 13 …… Air guide, 14…
… Bracket, 15… Stator, 16… Carbon brush, 17… Deformed tube, 18… Reel, 19… Contact terminal, 20…
... contact spring.

Claims (1)

(57) [Scope of request for utility model registration] 1. A built-in stator and rotor, an air guide for holding a load-side bearing of the rotor, a bracket for holding a non-load-side bearing, and a pair of carbon brushes built-in and held below the bracket. And a bridge-type contact spring that comes into contact with a contact terminal provided on a resin winding frame constituting the stator. One end of the contact spring is open and the other end is fixed to the upper surface of the deformed tube. A commutator motor in which the open end of the contact spring is pressed against the upper surface of the deformed pipe.