CN201113686Y

CN201113686Y - Motor shaft grounding screw thread structure

Info

Publication number: CN201113686Y
Application number: CNU2007201519139U
Authority: CN
Inventors: 谢丰民
Original assignee: QIHUA CO Ltd
Current assignee: QIHUA CO Ltd
Priority date: 2007-06-18
Filing date: 2007-06-18
Publication date: 2008-09-10
Anticipated expiration: 2017-06-18

Abstract

The utility model relates to a screw thread structure for the earthing of an electromotor shaft; a shell body of an electromotor is inside provided with a mandrel which can be driven to rotate, the circumferential surface of a tail end of the mandrel is at least provided with a section of a fine screw thread structure; an earthed carbon brush device is arranged on the side of the fine screw thread structure and is provided with a carbon brush, a hollow positioning body for the carbon brush to sleeve in and a spring which is arranged inside the hollow positioning body and used for pushing against the carbon brush in order that the surface of the front end of the carbon brush is supported on the fine screw thread structure. The screw thread structure for the earthing of the electromotor shaft uses line contact to replace surface contact, substantially removes frictional heat and the generation of oxygen membrane, cleans out carbon and copper powders, etc. on the surface of the carbon brush caused by friction in order to keep the surface of the carbon brush clean forever when the screw thread structure rotates, thereby keeping a contact resistor between a slip ring or a shaft and the carbon brush stable and reducing the abrasion of the carbon brush.

Description

The earthy helicitic texture of motor reel

Technical field

The utility model relates to a kind of motor, relates in particular to the earthy helicitic texture of a kind of motor reel.

Background technology

The structure of general motor 10 includes: axle 14 that a shell body 11, a stator 12, a rotor 13, can be driven in rotation and the ball bearing 15 that supports this axle 14 as shown in Figure 1.These motor 10 are in use because the magnetic circuit imbalance, and external pressure voltage (as the PWM voltage of alternating current motor frequency converter or DC motor speed control), axle magnetization effect, electrostatic induction (static that is produced as belt pulley 16 and belt 161) wait and the generation shaft voltage.

This voltage can cause 152 of ball bearing 15 inner and outer rings to produce so-called shaft current; When the contact point of electric current through ball 151 and inner and outer ring 152 produces electric arc ARC and form the cratering on inner and outer ring ball runway surface and the consequence that washing board striped erosion vestige (washboard effect) causes noise and damage of bearings (bearing failure) at last.

Address the above problem method a little at present, have and use the axle insulation and two kinds of the ground carbon brush of being coupling.Wherein this ground carbon brush that is coupling has simple and easy and inexpensive advantage, so often adopted by general motor, its structure as shown in Figure 1, on the shaft tail end surface or a slip ring 141 of this axle 14, with a carbon brush 17 and its rear end compression spring 18, carbon brush 17 front end faces are closely contacted with the slip ring or the axle surface of axle head, form the bypass (by-pass) of the inner and outer ring 52 of bearing 15.Because its contact resistance is far below the resistance of 152 of bearing inner and outer rings, shaft tail end or slip ring 141 and carbon brush 17 so shaft current can be flowed through and ground connection; Therefore this ball bearing 15 is protected and is prolonged its useful life.

But; the carbon brush 17 on this ground that is coupling in use for some time; can be on shaft tail end surface or slip ring 141; form a tail black oxide film; its composition comprises greasy dirt, dust, copper powder etc., and contact resistance value is risen gradually, when resistance during greater than the resistance of the inner and outer ring 152 of bearing 15; the most shaft current bearing 15 of can flowing through causes the defencive function thereby the forfeiture of ground connection carbon brush 17.

So how to eliminate the black oxide film of a surface or slip ring 141, stable to keep in touch resistance value, be the problem that the utility model institute desire solves.

The utility model content

Technical problem underlying to be solved in the utility model is; overcome the above-mentioned defective that prior art exists; and provide a kind of motor reel earthy helicitic texture; it is with the contact of line contact replacement face; to significantly eliminate the generation of frictional heat and oxide-film during rotation; removings such as the carbon branch that the carbon brush surface is produced because of friction, copper powder make carbon brush surface protection cleaning forever.So can make the contact resistance between slip ring or axle and carbon brush keep stable, the carbon brush abrasion are more reduced.

The technical scheme that its technical problem that solves the utility model adopts is:

The earthy helicitic texture of a kind of motor reel is characterized in that, is provided with an axle that can be driven in rotation in the shell body inside of motor; This axle tail end circumferential surface is provided with one section fine thread structure at least; One ground connection carbon brush configuration is provided in a side of the side of this fine thread structure, and it possesses a carbon brush, and a hollow positioning body and that is nested with for this carbon brush is located in this hollow positioning body, makes its front end surface be resisted against the spring of this fine thread structure in order to this carbon brush of ejection.

The earthy helicitic texture of aforesaid motor reel, wherein the fine thread structure is in advance in a slip ring circumferential surface turning moulding, again this slip ring is pressed into and is fixed on this axle tail end and constitute.

The earthy helicitic texture of aforesaid motor reel, wherein the fine thread structure is in the direct turning moulding of described spindle seat end circumferential surface.

The earthy helicitic texture of aforesaid motor reel, wherein the carbon brush tail end is connected with an earth lead.

The earthy helicitic texture of aforesaid motor reel, wherein the hollow positioning body is provided with a stator in the bottom, and this stator is locked on the described shell body.

By the electric current ground connection feature of above-mentioned helix contact, the at present successful ground that is coupling that is applied in the treadmill motor.

The beneficial effects of the utility model are, it will significantly eliminate the generation of frictional heat and oxygen film with the contact of line contact replacement face during rotation, and removings such as the carbon branch that the carbon brush surface is produced because of friction, copper powder make carbon brush surface protection cleaning forever.So can make the contact resistance between slip ring or axle and carbon brush keep stable, the carbon brush abrasion are more reduced.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the structure cutaway view of existing motor

Fig. 2 is the exploded perspective schematic diagram of the utility model first embodiment

Fig. 3 is the combination schematic perspective view of the utility model first embodiment

Fig. 4 is the primary structure schematic diagram of the utility model first embodiment

Fig. 5 is the cutaway view of 5-5 line section shown in Figure 4

Fig. 6 is the schematic diagram of the utility model second embodiment

The number in the figure explanation:

20 motor, 21 shell bodies

22 axles, 23 bearings

30 slip rings, 31 fine thread structures

40 ground connection carbon brush configurations, 41 carbon brush

411 earth leads, 42 hollow positioning bodies

43 springs, 44 stators

45 screws

Embodiment

At first, consult shown in Fig. 2,3, the utility model first embodiment includes:

One motor 20, it possesses a shell body 21, and these shell body 21 inside are provided with an axle that can be driven in rotation 22; This axle 22 is supported by the ball bearing of being located in the shell body 21 23; And said structure is the prior art of general motor 20, so do not give unnecessary details.

Of the present utility model being characterised in that: these axle 22 tail ends are to protrude out at this shell body 21, and the sheathed slip ring 30 of fixing, and this slip ring 30 peripheral surface turning in advance forms fine thread structure 31; In view of the above, make these axle 22 tail end surfaces have the fine thread structure.

One ground connection carbon brush configuration 40, the side that is provided in a side of this fine thread structure 31, it possesses the hollow positioning body 42 that a carbon brush 41, one usefulness are nested with for this carbon brush 41, and one be located in this hollow positioning body 42, makes its end face be resisted against the spring 43 of this fine thread structure 31 in order to this carbon brush 41 of ejection.In addition, this carbon brush 41 is included in tail end and is provided with an earth lead 411, and this earth lead 411 can be stretched through out by these hollow positioning body 42 bottoms.

In the present embodiment, hollow positioning body 42 bottoms are provided with a stator 44, and are locked on this shell body 21 by a screw 45.But be not limited thereto, that is this hollow positioning body 42 also can not be locked on this shell body 21, but be locked in (not shown) on the board of motor 20 peripheries.Yet no matter where this hollow positioning body 42 is locked in, and its purpose all is to make this carbon brush 41 location, and it is kept in touch with fine thread structure 31 all the time.

Please consult Fig. 4, shown in Figure 5 again, the utility model is set as this slip ring 30 fine texture 31 of non-smooth surface, contact with line and to replace the contact of traditional face, at first blush as if against general convention, but prove through the long-time test result of inventor, the wear intensity that this carbon brush 41 and fine thread structure are 31, the abrasion of specific surface contact more reduce.

And, the more important thing is, with the contact of line contact replacement face, to significantly reduce the generation of frictional heat and oxide-film during these slip ring 30 rotations, and this fine thread structure 31 can produce the function of " spiral conveyor " when rotated, eliminatings such as carbon dust, copper powder with these carbon brush 41 surfaces are produced because of friction make these carbon brush 41 surfaces remain cleaning, so the contact resistance maintenance of 41 of slip ring 30 and carbon brush is stablized.And this effect must make can flow through this ground connection carbon brush configuration 40 and deriving smoothly of shaft current, thus can protect this ball bearing 23, and then prolong its useful life.

As shown in Figure 6, be the schematic diagram of the utility model second embodiment, it is directly in these axle 22 tail end circumferential surface turning moulding with this fine thread structure 31; It has the effect identical with last embodiment.

The above, it only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, every foundation technical spirit of the present utility model all still belongs in the scope of technical solutions of the utility model any simple modification, equivalent variations and modification that above embodiment did.

In sum, the utility model is on structural design, use practicality and cost benefit, it is required to meet industry development fully, and the structure that is disclosed also is to have unprecedented innovation structure, have novelty, creativeness, practicality, the regulation that meets relevant novel patent requirement is so mention application in accordance with the law.

Claims

1. the earthy helicitic texture of motor reel is characterized in that,

Be provided with an axle that can be driven in rotation in the shell body inside of motor, this axle tail end circumferential surface is provided with one section fine thread structure at least;

One ground connection carbon brush configuration is provided in a side of the side of this fine thread structure, and it possesses a carbon brush, and a hollow positioning body and that is nested with for this carbon brush is located in this hollow positioning body, makes its front end surface be resisted against the spring of this fine thread structure in order to this carbon brush of ejection.

2. the earthy helicitic texture of motor reel according to claim 1 is characterized in that described fine thread structure is in advance in a slip ring circumferential surface turning moulding, again this slip ring is pressed into and is fixed on this axle tail end and constitute.

3. the earthy helicitic texture of motor reel according to claim 1 is characterized in that described fine thread structure is in the direct turning moulding of described axle tail end circumferential surface.

4. the earthy helicitic texture of motor reel according to claim 1 is characterized in that described carbon brush tail end is connected with an earth lead.

5. the earthy helicitic texture of motor reel according to claim 1 is characterized in that described hollow positioning body is provided with a stator in the bottom, and this stator is locked on the described shell body.