JPS5949777B2 - Electric motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric motor suitable for use in, for example, a vacuum cleaner or a juicer.

Generally, in electric appliances such as vacuum cleaners that use commercial power, the power cord is often wound around a cord reel and housed within the main body.

The cord reel is arranged in series with the electric part, and the size of the main body is the sum of the length of the electric part and the length of the cord reel, making it difficult to make it compact. .

In addition, based on a mere concept, there are also devices in which a cylindrical cord reel is provided by fitting into the inner diameter portion of a cylindrical main body, and an electric part is disposed within the inner space of the cord reel.

However, in this type of device, the main body and the cord reel are simply connected, and if you look at the electric part alone, there is no connection with the cord reel, and it is difficult to obtain smooth rotation of the cord reel itself. .

The present invention has been made in view of these points, and aims to provide an electric motor that can utilize space effectively, reduce noise, and can be easily electrically connected to a motorized part. be.

2 The present invention provides a cord reel body having a bottomed cylindrical shape on the outer periphery of the electric part, and a small-diameter shaft body provided at the protruding end to hold a bearing for the rotor of the electric part. , the cord reel body is characterized in that the bottom part of the cord reel body is rotatably fitted to the shaft body to hold the shaft.

Therefore, the electric part and the cord reel body are arranged concentrically, making it possible to shorten their axial length, requiring less space for installation into the equipment, and the cord reel body being held by its shaft. Because of this, the shaft can be easily held.
If a sliding contact or the like is provided at the bottom of the tube, electrical connection to the electric part can be easily made, and the tube also functions as a sound-insulating tube.

An embodiment of the present invention will be described based on FIG.

A motorized part 2 is attached to the inside of a frame 1 formed into a cylindrical shape with a bottom and a one-way opening.

That is, this electric part 2 consists of a stator 3 fixed to the frame 1 and a rotor 4 located inside the stator 3, and the rotor 4 is fixed to a shaft 7 held at both ends by bearings 5 and 6. There is.

A commutator 8 is fixed to the shaft 7, and a brush 10 held by a brush holder 9 fixed to the frame 1 is pressed against the commutator 8 by being biased by a spring 11.

These brushes 10 are electrically connected to contacts 13 provided on the brush holder 9 in a direction perpendicular to the brushes 10 and biased by a spring 12.

Further, one of the bearings 5 that holds the shaft 7 is housed in a protrusion 14 formed in the frame 1.

Therefore, the blower 1 is attached to the flange 15 of the frame 1.
6 is fixed with rivets.

This blower 16 has a base 1 that holds the bearing 6.
7 and this base 17 is connected at the outer periphery and has a ventilation hole 1 in the center.
8 and a cover 19 formed with these bases 1
A fan 20 is fixed to the end of the shaft 7 in an internal space defined by the shaft 7 and the cover 19.

The air guide plate 21 installed along the fan 20 and the base 17 have through holes 21a, 21b and through holes 17a, 17.
b is formed, and the wind generated by the fan 20 is sent to the outside air through the through holes 21a and 17a, and
b, 17b into the electric part 2.

The stator 3 of this electric part 2 has a notch (not shown) in its circumferential direction, and has sufficient ventilation space in the axial direction.

A notch 22 is formed in the frame 1 for discharging the wind that has passed through the electric part 2 (the shape of the frame before the notch is formed is shown by a chain line).

Next, a cylindrical cord reel body 23 with a bottom is provided at a predetermined distance from the outer periphery of the electric part 2, the corner notch, and the outer periphery of the frame 1.

The cord reel body 23 includes a reel 26 having flanges 24 on both sides and for winding and holding a power cord 25, and a bottom portion 27 formed integrally with the reel 26.

The center part of this bottom part 27 is fitted and held by a shaft body 28 which is a small diameter shaft part which is fitted and fixed to the outer circumferential side of the punching part 14,
Further, a ring-shaped sliding contact 29 that connects with the contact 13 is provided on this side surface.

These sliding contacts 29 are connected to the power cord 25, respectively.

Further, a return spring device 30 is fixed to the side of the cord reel body 23 by elastic legs 31.

At the center of the base 32 of this return spring device 30 is an intermediate shaft 33.
is provided through the shaft 28, and the side plate 34 located at the outer end and the intermediate shaft 33 are fixed to the shaft body 28 with fixing screws 35.

One end of a mainspring spring 36 is fixed to the spacer shaft 33 with a screw 37, and the other end of the mainspring spring 36 is fixed to the base 32.

Further, the side plate 34 is provided with a brake arm 39 that interlocks with the knob 38, and a roller 40 attached to the tip of the brake arm 39 is joined to the inner circumferential surface of the base 32.

Furthermore, a presser 41 partially fixed in the circumferential direction of the frame 1 is connected near the end of the inner peripheral surface of the cord reel body 23 on the side of the blower 16 to prevent the cord reel body 23 from falling. It is prevented.

In such a configuration, the outer diameter of the frame 1 of the electric part 2 is smaller than the outer diameter of the blower 16, and therefore,
The outer diameter of the cord reel body 23 arranged around the outer periphery of the electric part 2 almost matches that of the blower 16.

Therefore, even though the cord reel body '23 is provided, the overall length hardly increases, and the dead space around the outer periphery of the motorized part 2 is utilized very effectively.

Furthermore, even if the return spring device 30 is connected to the cord reel body 23 to form an automatic retracting system, the length in the axial direction of the return spring device 30 may be short, so there is little effect on downsizing.

Furthermore, since the electric part 2 that generates the most noise is covered with the cord reel body 23, the noise is not directly emitted to the outside, and the cord reel body 23 also functions as a soundproof cylinder.

By providing a sliding contact 29 on the bottom part 27, electrical connection to the electric part 2 is easy, and the frame 1
Since there is a gap between the two, it also functions as a wind guide tube.

In particular, since the cord reel body 23 is fitted onto the small-diameter shaft body 28, it is maintained in a smooth rotating state.

In the present invention, as described above, a cylindrical cord reel body with a bottom is disposed around the outer periphery of the electric part, and the bottom of the cord reel body is rotatably supported, so that the dead space of the outer layer of the electric part can be effectively used. As a result, the entire structure can be made compact and can be easily designed to be incorporated into equipment.The cord reel body can also function as a soundproof tube, and can be used to connect electrically powered parts. Electrical connection is easy, especially since the bottom part is pivoted, the holding structure of the cord reel body is simple as it is based on a small diameter shaft, and the axial length is short. It has the effect of being able to obtain a good and smooth rotational state.

[Brief explanation of the drawing]

The drawing is a partially cutaway side view showing an embodiment of the present invention. 2...Electric part, 23...Cord reel body, 27...Bottom part, 28...Shaft part.

Claims (1)

[Claims] 1. A bottomed cylindrical cord reel body is disposed on the outer periphery of the electric part, and a small-diameter shaft body is provided at the protruding end to hold a bearing for the rotor of the electric part, and the cord reel body is An electric motor characterized in that the shaft is held by rotatably fitting the bottom part of the body to the shaft body.