JPS5817944Y2 - electromagnetic brake - Google Patents

Description

[Detailed description of the invention] This invention is used in the components of machinery, and connects the drive system by connecting the mover by the excitation suction operation of the excitation coil built in the stator side. This relates to electromagnetic brakes.

An example of a conventional electromagnetic brake of this type is shown in FIG.

Referring to FIG. 1, 1 is a stator containing an excitation coil 2; 3 is a flange that holds the stator 1 and is fixed almost hermetically to a fixing member as one of the drive systems (not shown); 4 is an injected resin for fixing the excitation coil 2;
5 is a lining bonded to the injected resin 4; 6 is a movable member facing the lining 5 with a gap g; 7 is a rotating body fixed to the other shaft of the drive system; A spline tooth 7a is formed on the spline tooth 7a.

! A slider 8 is semi-fixed to the outer periphery of the rotating body 7 and slides on the spline teeth Ia by an axial force; A gap G that is equal to the gap g between
10 is a spring interposed between the slider 8 and the shaft boss 9, and 11 is an annular retainer made by cutting or the like and brought into contact with the slider 8 on the opposite side of the spring 10. , 12 is a bolt for integrally fixing the movable element 6, the shaft boss 9 button, and the retainer 11, and 13 is a stop ring for preventing the movable element 6 from moving to the side opposite to the lining 5.

The retainer 11 is buttoned in contact with the shaft boss 9 over its entire circumference, and the outer circumference of the slider 8 has a sealed structure.

In the above configuration, when the excitation coil 2 is not energized, the slider 8 is moved as shown in FIG.
The spring 10 presses the shaft boss 9 to the right to maintain the gap G, and the movable element 6 connected to the shaft boss 9 faces the lining 5 through a certain gap G. and the connecting force is not working.

Further, when the excitation coil 2 is energized, a magnetic flux ψ is generated in the magnetic path shown by the dotted line, and an attractive force is generated between the stator 1 and the movable element 6, and this attractive force is caused by the elastic force of the spring 10. By overcoming this, the shaft boss 9 is attracted to the lining 5 side, and therefore the movable element 6 is joined to the lining 5, and a connecting force is applied to the rotating body 7.

In this case, when the connection action is repeated, the gap g becomes larger than the gap G due to wear between the lining 5 and the movable element 6, but when the condition (g>G) is reached, the excitation coil 2, the shaft boss 9 comes into contact with the slider 8, forcibly moves the slider 8 by (g=G) toward the lining 5, and joins the lining 5 and the movable element 6. If the excitation coil 2 is deenergized in this state, the slider 8 is fixed at this moving position! Then, the movable element 6 returns together with the shaft boss 9, and the variation in the gap g is eventually compensated for, so that both gaps are always maintained in the relationship (g=G).

By the way, in the electromagnetic brake having such a configuration, abrasion powder is generated when the lining 5 and the movable element 6 are joined together, and
Since the 7-lunge 3 side is sealed from the outside by a fixing member (not shown), the air within the stator 1 is temporarily compressed, and the air passes through the path indicated by the continuous arrows.

Therefore, wear particles entering the inside of the stator 1 reach the gap between the splines 7a and 9a according to this air circulation, and at the same time, due to the centrifugal force, the inside of the stator 1 surrounded by the retainer 11 and the shaft boss 9. It will reach the 8th part of the slider.

Here, the wear powder that has reached the gap between the splines 7a and 9a is pushed out toward the spline end side because the splines slide in the axial direction, and is discharged to other passages or to the outside by centrifugal force. However, since there is no other way to escape, the wear particles that reach the slider 8 through other paths, that is, centrifugal force, gradually accumulate, and eventually the slider 8 and the accumulated wear particles This interferes with each other and makes it difficult for the slider 8 to mechanically slide on the splines, so the gap between the slider 8 and the spring 10 must always be maintained at (g=G'). If the slider 8 does not move properly, it will cause a problem in that it will not operate normally.

Therefore, even if the excitation coil 2 is energized, the movable element 6 may not be connected to the lining 5, and not only will a connecting force not be obtained, but sometimes friction particles may also enter between the slider 8 and the retainer 11. Even if the excitation coil 2 is deenergized, the movable element 6 may not return to its normal state and a connecting force may be applied to it.Furthermore, the retainer 11 needs to be fixed with a bolt 12, which is a female thread. Due to its shape, it had to be cut from a round bar or the like, which had the disadvantage of increasing manufacturing costs.

In order to improve the above-mentioned conventional drawbacks, this invention makes the retainer made of an annular silver-gold material, and attaches the retainer to the shaft boss at predetermined angular intervals by punching out the parts in the axial direction. The outer periphery of the slider is opened so that abrasion powder that enters the slider portion can be discharged to the outside through the opening.

Examples of this invention will be described below with reference to FIGS. 2 to 5.

Fig. 2 shows the configuration of an apparatus according to an embodiment of the invention, and Fig. 3 shows its operation mode.
The figure shows details of the retainer in this invention.

1 and 3, the same reference numerals as in FIG. 1 indicate the same or corresponding parts. In this invention, as shown in FIGS. 4 and 5, the retainer 1
4, the retainer 14 is made of an annular sheet metal material, and the parts 14a for mounting it on the shaft boss 9 are punched out in the axial direction at predetermined angular intervals, and the parts 14a are not mounted on the parts 14a. The retainer 14 formed in this way is formed by drilling a hole 14b.
As shown in the button in the figure and in FIG. 4, in the conventional example shown in FIG. The retainer 14 is attached to the movable element 6 from the part 14a side through the shaft boss 9 using bolts 15, and by this attachment, the outer circumference of the slider 8 is formed so that the protruded part 14a is connected to the retainer 14. Axis boss 9
The opening 14c to the inside of the stator 1 acts as a partial spacer between the stator 1 and the stator 1.

Therefore, in this invention having the above structure, the abrasion powder generated when the lining 5 and the movable element 6 are joined passes through the following route.

In other words, the wear particles that enter the splines 7a and 9a are
On the one hand, it is ejected to the outside through between these splines as in the conventional case, and on the other hand, it similarly enters the slider 8 portion between the retainer 14 and the shaft boss 9, but this slider 8 portion is released through the opening 14c in the forward direction. Since it is open to the inside of the stator 1, the opening 14 is prevented from being deposited in this part.
It is released from c by the centrifugal force caused by rotation, so that the gap adjustment action of the slider 8 where g=G is not inhibited, and a stable electromagnetic braking action can always be obtained.

In addition, in this embodiment, the screw hole of the bolt 15 is placed on the movable element 6 side, and the retainer 14, the shaft boss 9, and the king of the movable element 6 are integrally fixed from the retainer 14 side. In this case, the hole 14b can be simply a bolt insertion hole, which has the advantage that the retainer 14 can be easily manufactured from, for example, a silver-gold material by press molding.

Although the electromagnetic brake has been described above, the same effect can be achieved by rotating the stator and using an electromagnetic coupling device.

As detailed above, according to this invention, the retainer is attached to the shaft boss by punching out sections in the axial direction at predetermined angular intervals, and this attachment is done by opening the outer periphery of the slider by punching out the sections. to prevent wear particles from entering the slider.
Since it is designed so that it can be discharged to the outside from this opening, it is possible to perform the gap adjustment effect between the lining and the mover by the slider well, and as a result, the life of the lining is almost reached and the normal condition is maintained. The electromagnetic braking effect can be obtained, and furthermore, the retina can be manufactured simply and easily and can be provided at low cost, which has various practical effects.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts showing the configuration of a conventional electromagnetic brake.
Fig. 2 is a sectional view of a main part showing the configuration of an embodiment of the electromagnetic brake according to the invention, Fig. 3 is an explanatory view showing the mode of operation of the same, Fig. 4 is a front view of the retainer, and Fig. 5 is a It is a side view of the same main part. DESCRIPTION OF SYMBOLS 1... Stator, 2... Excitation coil 5... Lining, 6... Mover, 7... Rotating body, 7a... Same spline tooth, 8... Slider, 9...・Axis boss, 9
a... Same spline tooth, 10... Spring, 14...
Retainer, 14a... the same mounting is a part, 14b... the same mounting is a hole, 14c... the same opening.

Claims (1)

[Scope of utility model registration request] A lining 5 is applied to a stator 1 held by a flange 3 and containing an excitation coil 2, and a movable element 6 supported by a shaft boss 9 engaged with a rotating body 7 through spline teeth 7a and 9a is opposed to the lining 5. Along with letting
a retainer 1 fixed to the stator 1 side of the shaft boss 9;
4, and a slider 8 inserted between the shaft boss 9 and the retainer 14, and the slider 8 and the shaft boss 9
A spring 10 is interposed between the lining 5 and the movable element 6 due to the gap between the slider 8 and the shaft boss 9.
In addition to regulating the opposing gap between the lining 5 and the movable element 6, the interior of the stator 1 is sealed by the flange 3 and a fixing member fixed thereto from the outside. The retainer 14 is made of an annular sheet metal material, and mounting portions 14a for attaching to the shaft boss 9 are punched out in the axial direction at predetermined intervals. An electromagnetic brake characterized in that a radial opening 14c is provided between.