JPH034042A - Structure for electromagnetic brake - Google Patents

Abstract

PURPOSE:To reduce cost and improve reliability in an electromagnetic brake by mounting a rubber member to a surface which is a surface of at least one member of the end plate and the armature and placed in a position opposed to a friction plate. CONSTITUTION:An annular rubber plate 16 is guided to a surface 54S opposed to a friction plate 58 in an armature 54, while an annular rubber plate 18 is similarly glued to a surface 56S opposed to the friction plate 58 of an end plate 56. At the time of braking, since these rubber plates 16, 18 and the friction plate 58 are brought into press contact with each other, each rubber plate 16, 18 is relatively twisted for the armature 54 and the end plate 56 to receive force with the exfoliation intended. Then knurling work and rotary polishing or the like are applied onto the armature surface 54S and the end plate surface 56S to form a rough surface, and the rubber plates 16, 18 are glued onto the rough surface. Consequently, by preventing the rubber plates 16, 18 from easily exfoliating from the armature 54 and the end plate 56, reliability is improved.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to the structure of a friction plate type electromagnetic brake.

Therefore, it can be used for electromagnetic brakes for servo motors, etc.

[Conventional technology]

A friction plate type electromagnetic brake such as a servo motor is generally formed of a combination of cylindrical or polygonal tube-shaped members, and the friction plate is made of an annular plate member splined to a hub. When the armature operates, this friction plate is pressed against the end plate, which is a fixed member, and brakes the rotating shaft that is integrally attached to the hub, or it becomes free against the end plate and releases the rotating shaft. This serves to ensure the rotation of the rotating shaft. Further, the friction plate is generally molded from asbestos.

[Problem to be solved by the invention]

However, when molded with asbestos, the asbestos has relatively low wear resistance, and continuous use may cause the thickness of the friction plate to decrease or the fibers on the friction surface to become clogged. It cannot be said that the smaller the friction coefficient, the higher the reliability. Furthermore, the formability is not good, and the dimensional accuracy of the spline part that engages with the hub is insufficient, and if the fit between the two is too tight, the spline of the asbestos friction plate will not work even after the brake is released. The spline part gets caught on the hub and therefore cannot be completely freed from the end plate which is the fixed part, which can cause abnormal wear. Also, if the fit between the two parts is loose, so-called spline play will increase. As a result, the rotational play of the shaft member during braking operation increases.

Asbestos as a material is also more expensive than common rubber and resin, and is also harmful to the human body.

Therefore, an object of the present invention is to provide a low-cost and highly reliable electromagnetic brake structure in order to solve this problem.

(Means for Solving the Problems) In view of the above object, the present invention provides an end plate that is fixed at a predetermined distance from the brake core, and an armadure 5 brake that is provided between the end plate and the brake core. , in an electromagnetic brake having a friction plate disposed between the armature core and the end plate, a surface of at least one member of the end plate and the armature, facing the friction plate; To provide a structure of an electromagnetic brake characterized in that a rubber member is attached to the surface at a position where the brake is applied.

[For production]

Instead of conventional asbestos, which generates friction during braking, a rubber member is attached to the end plate or armature, and friction is generated between this and the friction plate. Therefore, the friction plate itself can be made of general metal or resin.

〔Example〕

The present invention will be described in more detail below based on embodiments shown in the accompanying drawings. First, referring to Figures 11 and 32,
The end plate 56 is spaced apart from the core 50 by a suitable distance via a spacer 64, and is fixed by a screw member 62. A friction plate 5 is provided between the end plate 56 and the core 50.
8 and an armature 54 are arranged. The armature 54 is configured to be movable along a spacer 64, and the friction plate 58 is splined to a hub 60 that can be fixed to a rotating shaft 66. The core 50 accommodates a winding bundle 52 and further includes a coil spring (not shown), so that when the winding bundle 52 is not energized, the coil spring is in the r-mature state. 54 and the friction plate 58 are pressed against the end plate 56 to brake and fix the hub 60 and the rotating shaft 66, and when the winding bundle 52 is energized, the armature 54 is attracted toward the core 50, and the friction plate 58
The hub 60 and the rotating shaft 66 are made rotatable. In the following, the friction plate is an annular plate made of metal or resin, and a rubber member is attached to the end resistor 56 and the surfaces 56S and 543 of the armature 54, which are opposite to the friction plate 58, in order to generate a V and a curve during braking. The installed structure of the electromagnetic brake will be explained.

Referring to FIGS. 1 and 2, an annular rubber plate 1 is provided on a surface 54S of the armature 54 facing the friction plate 58.
6 is pasted. Referring to FIGS. 3 and 4, a similar annular rubber plate 18 is attached to a surface 56S of the end plate 56 facing the friction plate 56S. During braking, the rubber plates 16.18 and the friction plate 58 are brought into pressure contact with each other, so each rubber plate 16.18 is twisted relative to the armature 54 and the end plate 56 in an attempt to separate them. receive the power to Therefore, armature surface 5
A structure is adopted in which the 4S and end plate surface 56S are roughened by knurling, rotary polishing, etc., and the rubber plates 16 and 18 are pasted thereon. In order to improve the reliability of braking, as mentioned above, a rubber plate is attached to the armature 54 and the end plate 5.
Although it is desirable to provide it on both sides, depending on the conditions of use, it may be provided on only one side. The same applies to the following examples.

5 and 6, instead of the above-mentioned row left processing, etc., or in addition to the knurling processing, etc., a recess 20 such as a counterbore is formed on the surface 548' of the armature 54' facing the friction plate.
A plurality of rubber members 16' are provided, and a rubber material is poured thereon to integrally form a rubber member 16'. This prevents the rubber member 16' from peeling off from the armature surface 548'. A similar structure may be adopted for the end plate 56 as well.

7 to 10 show other structures for attaching the rubber plate to the armature. 7 and 8, a recess 22, which is an annular groove, is provided on the surface 54S'' of the armature 54'', and an annular rubber plate 16'' is accommodated in the recess 22,
It is pasted. In this case, if the bottom surface 22B of the recess 22 and its side wall surface 223 are formed to form an acute angle, the rubber plate 16'' is pressed by the friction plate 58 (FIG. 11) during braking. The bottom of the plate 16″ is the recess 22
The rubber plate 16'' is engaged with the side wall surface 223 forming an acute angle, making it difficult for the rubber plate 16'' to separate from the armature 54 pa.

FIG. 9 shows an armature 54' having the recess 22 described above.
2. Fig. 1 is different from Figs. 8 and 9 in that it has a recess 22' whose side wall surface is somewhat shaped. Pour the rubber material into the armature 54"' formed in 54S"', and
7' is integrally formed more firmly. In these cases as well, the end plate may have the same configuration as the armature, and the bottom surface of the recess 22, 22' may be subjected to low left processing or the like. Furthermore, the planar shape of the recesses 22, 22' may be polygonal. It is clear that when a rubber plate is housed in a recess, the depth of the recess must be designed so that the surface of the rubber plate protrudes somewhat beyond the recess.

[Effects of the Invention] As is clear from the above description, according to the present invention, the contact portion during braking is made of a rubber member, and the rubber member is attached in a manner that makes it difficult to peel off from the substrate. This makes it possible to provide a highly reliable and low-cost electromagnetic brake structure.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the armature of the electromagnetic brake according to the present invention, Fig. 2 is a sectional view taken along the arrow line ■-■ in Fig. 1, Fig. 3 is a plan view of the end plate, and Fig. 4 is Fig. 3. Cross-sectional view along the arrow line rV-rV, 5th
The figure is a plan view of an armature in another form, FIG. 6 is a sectional view taken along the arrow line Vl-VT in FIG. 5, FIG. 7 is a plan view of an armature in another form, and FIGS. Each figure is a partial cross-sectional view taken along arrow line PP in Figure 7, showing a different form, and Figure 11 is a cross-sectional view of the entire electromagnetic brake, taken along arrow line XI-XI in Figure 12. FIG. 12 is a plan view of the entire electromagnetic brake. 16, 16', 16'', 17.17', 1
g...Rubber member, 20...Recess, 22.22
'... annular recess, 50... core, 54.
... Armature, 56... End plate, 58...
・Friction plate. Figure 1 Figure Figure Figure Figure Figure Figure Figure Figure 1 Figure 2 Map Procedure Amendment (Voluntary) July 1999

Claims (1)

[Claims] 1. An end plate fixed at a predetermined distance from the brake core, an armature provided between the end plate and the brake core, and an armature between the armature and the end plate. An electromagnetic brake having a friction plate arranged therein, characterized in that a rubber member is attached to a surface of at least one member of the end plate and the armature at a position facing the friction plate. The structure of an electromagnetic brake. 2. The structure of an electromagnetic brake according to claim 1, wherein rubber members are respectively attached to a surface of one side of the end plate and a surface of one side of the armature at a position facing the friction plate. 3. Claim 1 or 2, wherein the friction plate is made of metal or resin.
The structure of the electromagnetic brake described in . 4. The electromagnetic brake structure according to claim 1, wherein the surface of the end plate or armature to which the rubber member is attached is rough-processed, and the rubber member is adhered to the rough-processed surface. 5. The rubber member according to claim 1, wherein the rubber member is attached by providing an engagement recess on the surface of the end plate or armature to which the rubber member is attached, and integrally molding a rubber material on the surface provided with the recess. Structure of electromagnetic brake. 6. A recess for accommodating and engaging the entire rubber member is provided on the surface of the end plate or armature to which the rubber member is attached, and the rubber member is accommodated and bonded to the recess. The structure of the electromagnetic brake described in . 7. A recess for accommodating and engaging the entire rubber member is provided on the surface of the end plate or armature to which the rubber member is attached, and the rubber member is attached by integrally molding the rubber member in the recess. The structure of the electromagnetic brake according to claim 1. 8. The electromagnetic brake structure according to claim 6 or 7, wherein the angle between the bottom surface of the recess and the side wall is an acute angle.