CN1057647C

CN1057647C - Housing and small direct current motor using the same

Info

Publication number: CN1057647C
Application number: CN96105100A
Authority: CN
Inventors: 须田秀利; 陈永煌
Original assignee: TOKYO SPARE PARTS INDUSTRIAL Co Ltd
Current assignee: TOKYO SPARE PARTS INDUSTRIAL Co Ltd
Priority date: 1995-06-01
Filing date: 1996-05-24
Publication date: 2000-10-18
Anticipated expiration: 2016-05-24
Also published as: TW363299B; CN1139310A; JPH08331789A; JP3313541B2

Abstract

A housing to reduce electric noise and to improve the release strength of a bracket and a small direct current motor using the same. The housing comprises a metal case, and a bracket engaged with the opening of the case, wherein a groove is formed from the outside on the entire outer periphery of the bracket. The outer periphery of the bracket is formed slightly larger than the diameter of the opening of the case. Thus, when the bracket is press-injected in the case, the outer periphery of the bracket has elastic properties in the radial direction, and hence the bracket can be press-injected without deflecting the case, and the adhesive properties can be improved. Even if the force from the inside is developed at the bracket, the force is developed in the direction of intruding the outer periphery into the opening of the case by the groove, and the bracket is scarcely drawn.

Description

Case and use the small-sized DC motor of this case

The invention relates to the case that forms for the radiation that prevents electric clutter and use the small-sized DC motor of this case, particularly be fit to be loaded into the small-sized DC motor on the stereo set with long wave receiving system.

Existing this structure is the opening at the cylinder type metal shell that the end is arranged, and loads onto the holder lid combination of tabular or plate-like and forms case, particularly as the case of small-sized DC motor.Shown in the 4th figure, this kind mounting structure is to pack into to hold in the palm by means of the opening that round-ended cylinder shell C is arranged to cover B, and with the D of clamping plate portion supporting fastening, and it is crooked to the inside to form edge of opening.

This kind structure, when with edge of opening Ca fastening, shown in the 5th figure, it does not have the part of fastening can produce stress deformation and cause gap S.Therefore, though be idiostatic between shell and the holder lid, on exchanging, produced potential difference, on direct current so can produce long clutter.When this kind motor mounting then being made on the stereo set with long-wave receiver the time long wave overlapping and cause the problem of sound equipment noise.

As to prevent planting here peristome that noise then must make about full periphery of holder lid and shell closely embedding.

Yet, make this shell good with the connecting airtight property of the telescoping part of holder lid, must be with this both circularity and the precision such as size of fitting portion improve, thereby cause cost unfavorable; And owing to the intensity that gets loose of holder lid improves chimeric tightness is strengthened, then can cause shell crooked and be a contact and make the reduction of connecting airtight property, and the friction of supporting is reduced and get loose easily.

The edge of opening of this shell particularly can cause bigger crooked for deriving indentation, there that current supply line establishes.For connecting airtight property of raising strengthens chimeric tightness, the edge of opening of shell is enlarged gradually, cause the holder lid to get loose easily on the contrary.

The 1st purpose of the present invention is: prevent that above-mentioned electric clutter from radiating to the outside.

The 2nd purpose of the present invention is: keep the 1st purpose, improve the intensity that gets loose of holder lid simultaneously.

In order to achieve the above object, the technical scheme taked of the present invention is as follows:

A kind of case, it is in the metal holder lid of this shell aperture portion by metal shell and embedding to combine, it is characterized in that this metal holder lid peripheral part is formed with groove by the outside, the periphery of this metal holder lid is slightly larger than the opening of shell simultaneously, this case is that this metal holder lid is pressed into aforesaid shell, makes its embedding on shell and form.

Wherein, aforesaid holder lid is for tabular.

Wherein, aforesaid metal holder lid is the tazza shape.

A kind of small-sized DC motor, the rotor of free rotaring ground supporting on the case that the holder lid of this shell aperture portion constitutes and magnetic field is offered the magnet of rotor and the electric supply installation of supply electric power but have by metal shell and embedding, it is characterized in that: the peripheral part of this holder lid is formed with groove by the outside, the periphery of this metal holder lid is slightly larger than the peristome of shell simultaneously, this metal holder lid is pressed in the aforesaid shell, its embedding in shell.

Shown invention, belonging to metal shell and embedding on the case that the holder lid of this shell aperture portion is combined, holder is covered peripheral part and is formed with groove by the outside, and the periphery of holder lid is slightly larger than the peristome of shell simultaneously, through asking lid to be pressed into aforementioned shell its embedding on shell and gets final product.

The shape of holder lid shown in following accompanying drawing, is tabular or the tazza shape gets final product.Again, one uses the small-sized slewing motor of this kind case, it has a metallic casing, but with a free rotary ground supporting in a rotor of by embedding on the case that the holder lid of this shell aperture portion is formed, reach one the magnet of this rotor field and the electric supply installation of a supply electric power can be provided, wherein, the peripheral part of holder lid is formed with groove by the outside, the periphery of holder lid is slightly larger than the peristome of shell simultaneously, should hold in the palm to cover to be pressed into aforementioned shell and embedding in shell get final product.

The present invention has following positive effect:

Device according to above-mentioned formation, when the peristome of shell is pressed into holder and covers, owing to being formed with groove, the peripheral part at the holder lid make periphery have elasticity in radial direction, therefore holder can be covered at the not crooked state of outer cover body and be pushed down in shell, to improve its connecting airtight property, simultaneously because groove is to be formed by the outside, so for power from the inboard, because periphery is to go deep into the peristome of shell, thereby make the holder lid be difficult to get loose.

According to the device of above-mentioned formation, owing to the thickness setting of holder lid can be become thin thereby make that shroud body can slimming.

According to the device of above-mentioned formation, can be with speed governing component built-ins such as electronic controllers in wherein.

Device according to above-mentioned formation, in the time will asking lid to be pressed into the peristome of shell, owing to being formed with groove, the peripheral part at the holder lid make periphery have elasticity in radial direction, therefore holder can be placed on the not crooked state of outer cover body is pushed down into and improves connecting airtight property, so, shell and the unlikely generation alternating current potential difference of holder lid.Therefore, use the small-sized DC motor machine of this case long clutter can not take place.Followingly embodiments of the invention are elaborated with reference to accompanying drawing:

The 1st figure is the significant points cross section front elevation of the 1st embodiment of case of the present invention;

The 2nd figure is the case of the 2nd embodiment of the present invention and significant points cross section front elevation with the small-sized DC motor of this case;

The 3rd figure is the electric clutter data comparison diagram of case of the present invention and known case;

The 4th figure is the cross section front elevation of significant points of the composite construction of known case;

The 5th figure is the plane graph according to the 4th figure assembled state.

(the 1st embodiment)

The 1st figure is the cross section front elevation of significant points of the 1st embodiment of case of the present invention.Case H is used to small-sized DC motor, and it is provided with the 1b of clamping plate portion on the peristome 1a of the metal shell 1 that the round-ended cylinder shape is arranged, and is fixed with metal holder lid 2 on the 1b of this clamping plate portion.Can be known by the expanded view of A portion and to show, on the peripheral part 2a of this tabular metal holder lid 2, be formed with groove 2b around full week by the outside, its degree of depth is about half of thickness of slab and its cross section is V-shape.

It is the opening that is slightly larger than aforementioned metal shell 1 that 2 periphery is covered in this kind holder.This kind groove 2b be can by the punch press handling ease go out.

Therefore, cover 2 when being pressed in aforementioned peristome 1a when holding in the palm, through the groove 2b of V-shape, peripheral part 2a can produce slight strain in radial direction, and makes the peristome 1a of metal shell 1 to connect airtight under crooked not taking place.

When holder after embedding lid 2 got loose owing to the power from the inboard, because peripheral part has the V-shape groove of opening laterally, so periphery produced a power that penetrates with the inwall direction of the 1a of shell aperture portion, and the intensity that gets loose is become greatly.(the 2nd embodiment)

The 2nd figure is the cross section front elevation of the significant points of case the 2nd embodiment of the present invention, and holder is covered 22 and is tazza type shape, and in its inside, speed control loop part 3 is to be arranged on the wiring board 4 and with brush pedestal 5 to be integrated.

By the expanded view of B portion as can be known, the V-shape groove 22b of feature of the present invention be on the edge part 22a of cup vertically ecto-entad be pressed into.The holder lid 22 of this tazza shape is also identical with previous embodiment, makes its periphery be slightly larger than the opening of metal shell 11.

Among the figure, 11a is the peristome of expression shell 11, will hold in the palm by brush pedestal 5 by the 11b of clamping plate portion and cover 22 and support to fix.This brush pedestal 5 is provided with a pair of brush 6, and the rectifier on being configured in rotor R 7 constitutes the electric supply installation of electric power being supplied with rotor.In the foreign side of rotor,, rubber magnet 8 devices on shell, are only supplied with rotor R with magnetic field by the space.

11c is the breach that is equipped on shell for a part of 4a that derives the aforementioned printed circuit board (PCB) of using as current supply line 4 in addition.

When the holder lid 22 of the small-sized DC motor of formation like this similarly is pressed into the 11a of shell aperture portion with aforesaid embodiment, because V-shape groove 22b, the edge part 22a of cup is slightly deformed in radial direction, and the peristome 11a that can make shell 11 connects airtight under crooked not producing.

Again, back just being not easy and get loose in case 22 embeddings are covered in holder, its principle is identical with previous embodiment.

Be used in small-sized DC motor though illustrate above-mentioned case, be not limited to motor, also can use certainly as small generator and by shell and case and other parts that the holder lid is formed.

Now the waveform data according to the electric clutter shown in the 3rd figure illustrate superiority of the present invention.The clutter oscillogram of the audio device body the when A of the 3rd figure is the unloaded motor.With this oscillogram A is benchmark, and figure C is the clutter oscillogram of expression when loading the motor know the fastening mode, and figure B is that the clutter oscillogram when adopting motor of the present invention is loaded in expression.The result can know the situation that clutter of the present invention is lowered significantly thus.

As mentioned above, because its shell of case of the present invention is good with the connecting airtight property of holder lid, so S very close to each other, so for metal case, it is to be fit to be used in one can be loaded in order to the small-sized DC motor on the stereo set that receives electric clutter, particularly long wave.

And, to the intensity that gets loose, the effect of going deep into outer casing inner wall is arranged, thereby the intensity that gets loose is improved, so can obtain the good case of resistance to impact owing to using groove to make holder cover periphery by inboard and next power.

Claims

1, a kind of case, it is in the metal holder lid of this shell aperture portion by metal shell and embedding to combine, it is characterized in that this metal holder lid peripheral part is formed with groove by the outside, the periphery of this metal holder lid is slightly larger than the opening of shell simultaneously, this case is that this metal holder lid is pressed into aforesaid shell, makes its embedding on shell and form.

2, case as claimed in claim 1 is characterized in that: aforesaid holder lid is for tabular.

3, case as claimed in claim 1 is characterized in that: aforesaid metal holder lid is the tazza shape.

4, a kind of small-sized DC motor, the rotor of free rotaring ground supporting on the case that the holder lid of this shell aperture portion constitutes and magnetic field is offered the magnet of rotor and the electric supply installation of supply electric power but have by metal shell and embedding, it is characterized in that: the peripheral part of this holder lid is formed with groove by the outside, the periphery of this metal holder lid is slightly larger than the peristome of shell simultaneously, this metal holder lid is pressed in the aforesaid shell, its embedding in shell.