JPS63318324A - Manufacture of electromagnetic shell for electromagnetic brake/clutch - Google Patents

Abstract

PURPOSE:To reduce manufacturing cost and make it easy to form a magnetic cut-off gap by using one unit of shell for forming a magnetic cut-off gap near the extreme end. CONSTITUTION:A shell 7 is formed in such that the outer tube portion 20a of a shell member 20 in a double tubular shape is longer than the inner tube portion 20b. Next, a channel 22 is scraped off from the outer periphery side to radius direction on the outer tube portion 20a and a copper ring 21 in radius R is attached in this channel 22. Next, the copper ring 21 is pinched between members through crushing down the channel 22 of the outer tube portion 20a to the axial direction. Still more, extreme ends of the outer tube portion 20a and the inner tube portion 20b are made even. Next, the outer tube portion 20a is heated to melt the copper ring 21 for forming a magnetic cut-off gap C. Lastly, an attaching portion for a friction body 11 is formed with scraping off the portions including the copper ring 21 from the extreme end of the outer tube portion 20a on outer periphery and an inner periphery in the axial direction.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to electromagnetic brakes/clutches used, for example, in machine tools, and in particular to electromagnets in electromagnetic brakes/clutches that simplify the manufacturing method of electromagnetic shells. This invention relates to a method for manufacturing a shell.

[Prior Art] FIG. 2 is a sectional view showing the structure of a conventional electromagnetic brake. In this figure, 1 is a rotating shaft, 2 is a spline hub fitted on the outer periphery of the rotating shaft 1, and 3 is an armature spline-coupled to the outer periphery of the spline hub 2 near its right end. This armature 3 is biased to the left by a leaf spring 4. On the other hand, 6 is an electromagnet, which is composed of a shelf and a coil 8 placed inside the shelf. As shown in FIG. 3(B), this shelf is composed of a large-diameter outer ball 9 with a half-shaped cross section and a small-diameter cylindrical inner ball IO, and an inner ball 10 is arranged inside the outer ball 9. and the gap G between the upper right end of the inner ball 10 and the right inner peripheral end of the outer ball 9! Molten copper is poured into the outer ball 9 and the inner ball 10 are formed into one body. This copper brazing portion forms a magnetic shielding gap C for shielding residual magnetism. A friction body 11 shown in FIG. 2 is attached between the front end of the outer ball 9 and the front end of the inner ball 10. Also,
A flange 12 is attached to the rear end of the outer ball 9,
This flange 12 is bolted to a main body frame (not shown), and the electromagnet 6 is fixed thereto.

In the above configuration, when the electromagnet 6 is not excited, no restraining force acts on the armature 3, and the rotation axis 1 can freely rotate.

Next, when an excitation current is supplied to the coil 8, the magnetic flux generated from the coil 8 passes through the outer ball 9, the armature 3, and the inner ball 10 to form a magnetic path R. As a result, a magnetic attraction force acts between the armature 3 and the outer ball 9 and the inner ball 8, so that the armature 3 is attracted to the electromagnet 6. As a result, the armature 3 and the friction body 9 come into frictional contact. As a result, the armature 3 is braked and the rotary shaft 1 is braked. Next, when the excitation of the electromagnet 6 is stopped again, the magnetic flux generated from the coil 8 disappears, the electromagnetic attractive force between the armature 3 and the electromagnet 6 disappears, and the armature 3 separates from the electromagnet 6. In this case, the residual magnetism is the outer ball 9 or the inner ball! 0, magnetic path R remains and armature 3
is difficult to separate from the electromagnet 6, but this residual magnetism is blocked by the magnetic blocking gap C formed between the outer ball 9 and the inner ball lO, so the armature 3 must be released reliably. In this way, the rotation axis l is braked and released.

Note that the electromagnet 6 similar to the above is also used in the electromagnetic clutch.
The clutch is connected using the

[Problems to be Solved by the Invention] In the electromagnetic brake described above, the magnetic shielding gap C of the shelf must be formed to cross the magnetic path R of the inner ball 10 and the outer ball 9 in order to block residual magnetism. No. Therefore, in the past, the outer ball 9 and the inner ball 10 were formed separately, and copper was poured into the connecting portion between these two balls 9 and 10 to form a magnetic isolation gap C and connect both balls 9 and 10. . However, the two members 9 and 10, the outer ball 9 and the inner ball 1O, had to be formed individually, and copper had to be poured into the inner depths of these two members 9 and 10 to connect them, which was time-consuming and troublesome. .

It is also possible to form a magnetic shielding gap C in the armature 3 as shown by the broken line in FIG. It was a hassle.

This invention has been made in view of the above circumstances, and its purpose is to provide an electromagnetic brake that can easily form a magnetic cutoff gap C without dividing the shelf that forms the magnetic path R into two pieces. /An object of the present invention is to provide a method for manufacturing an electromagnetic shell in a clutch.

[Means for Solving the Problems] This invention forms the shell of an electromagnet into a double cylindrical shape, forms a groove in the radial direction near the tip of the outer cylinder part or the inner cylinder part of the shell, and A ring-shaped piece of copper is fitted into the groove, the groove is crushed in the direction of pongee, the copper piece is sandwiched between the members, the copper piece is heated, and the molten copper is poured into the crushed groove. The magnetic shielding gap is formed by filling the gap with the magnetic field.

[Embodiment] FIGS. 1A, 1B, and 1C are side sectional views showing the structure of an embodiment of the present invention. In this figure, the difference from FIG. 3 is that the shelf is formed by a single member 20 with a half-shaped cross-section, and a porcelain shielding gap C is provided by a copper ring 21 near the tip of the outer cylindrical portion 20a of this shell member 20. This is the point I made. In other words, first of all, the shelf is
As shown in FIG. 1(a), a double cylindrical shell member 20
The outer cylinder part 20a is formed longer than the inner cylinder part 20b. Next, a groove 22 is cut out in the radial direction from the outer circumferential side of the outer cylindrical portion 20a, and a copper ring 21 with a radius R is attached to this groove 22. Next, as shown in FIG. 1(b), i (422
Press it in the direction of pongee and insert the copper ring 2I between the members. Next, the tips of the outer cylindrical portion 20a and the inner cylindrical portion 20b are aligned. Next, the outer cylindrical portion 20a is heated to melt the copper ring 21, thereby transferring the molten copper into the pressed groove 2.
2 to form a magnetic shielding gap C. Next, a portion including the copper ring 21 from the tip of the outer cylindrical portion 20a is scraped off to the outer and inner peripheries in the pongee direction to form a portion for attaching the friction body 11.

Therefore, as described above, since the shelf is formed from one member 20, the manufacturing cost is reduced compared to the conventional shelf formed from two members. Further, since the magnetic shielding gap C is formed near the tip of the shelf, the magnetic shielding gap C can be easily formed.

In addition, in the above embodiment, the copper ring 21 is attached to the outer cylinder part 2.
Although it is attached near the tip of the inner cylinder portion 20b, it may be attached near the tip of the inner cylinder portion 20b in the same manner as described above.

[Effects of the Invention] As explained above, according to the present invention, the shell of the electromagnet is formed into a double cylindrical shape, and the shell (radially) is located near the tip of the outer cylinder part or the inner cylinder part of this shell. and this i?
Insert a ring-shaped copper into the hole, press this ) 14 in the direction of the pongee, insert the ring-shaped copper, heat the inserted copper, and this will cause molten copper to flow into the crushed groove. Since it is filled to form a magnetic isolation gap, only one shell is required, reducing manufacturing costs. Furthermore, since the magnetic shielding gap is formed near the tip of the shell, the magnetic shielding gap can be formed more easily than when brazing is performed deep within the inner circumference as in conventional electromagnetic brakes.

[Brief explanation of the drawing]

Figures 1 (a), (b), and (c) are side sectional views showing the configuration of an embodiment of the present invention, Figure 2 is a side sectional view showing the configuration of a conventional electromagnetic brake, and Figure 3 ( A) and (B) are a front view and a side sectional view showing the configuration of a shelf of the same electromagnetic brake. 7... Shell, 20... Shell member, 20a...
Outer cylinder part, 20b...Inner cylinder part, 21...Copper ring, 2
2...Groove, C...Magnetic blocking gap. Applicant God j14? Itki Co., Ltd. 214 Rerede

Claims (1)

[Claims] The armature includes an armature connected to rotate integrally with a rotating shaft, and an electromagnet that applies an electromagnetic attraction force to the armature and includes a coil and a shell forming an outer shell of the coil. In the electromagnetic brake/clutch, the shell of the electromagnet is formed into a double cylindrical shape, and a groove is formed in the radial direction near the tip of the outer cylinder part or the inner cylinder part of the shell, and a ring-shaped groove is formed in the groove. A copper piece is fitted, the groove is crushed in the pongee direction, the copper piece is sandwiched between the members, and the sandwiched copper piece is heated, thereby filling the crushed groove with molten copper. A method for manufacturing an electromagnetic shell for an electromagnetic brake/clutch, characterized in that a magnetic shielding gap is formed by