JPS6210958Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a power supply device for an electromagnetic clutch, an electromagnet, etc. (hereinafter simply referred to as an electromagnetic clutch, etc.).

As shown in FIGS. 1 and 2, a conventional power supply device of this type usually includes a yoke 1 forming a magnetic path, a coil 2 housed in a circumferential groove of this yoke 1, and a slip between the yoke 1 and the coil 2. It is composed of an insulating plate 3 and an insulator 4 that prevent the ring 5 from shorting. A power supply lug terminal 6A for supplying power from a power supply mechanism (not shown) to the coil 2 via the slip ring 5 is connected to the slip ring 5 at a notch 7A provided in the yoke 1.
Further, a grounding lug terminal 6B for grounding the coil 2 is located at a symmetrical position of the notch 7A to the yoke 1.
It is connected to the yoke 1 at a notch 7B provided in the yoke 1. Further, in FIG. 1, 8 is an insulating plate made of an insulating material, 9 is an insulating bushing made of nylon, rubber, etc., and 10 is an insulating filler filled between the outer peripheral surface of the coil 2 and the yoke 1.

Now, in the conventional embodiment shown in FIG.
An example is a technique in which an insulating plate 3 and an insulator 4, each formed into an annular shape by molding, cutting, etc., of Bakelite material, melamine material, etc., are press-fitted onto the outer circumferential surface of the yoke 1 and fixed by adhesion or the like. However, a technique of integrally forming the insulating plate 3 and the insulating body 4 has also been employed in the past. However, these conventional power supply devices have a structure in which an insulating plate 3 and an insulator 4, which are separate from the slip ring 5, are interposed between the yoke 1 and the slip ring 5, which makes the structure complicated and increases the overall size of the device. However, there were disadvantages such as a decrease in the reliability of the device due to loosening of the press-fit and peeling of the adhesive.

In view of the above, the present invention aims to provide a power supply device such as an electromagnetic clutch that has a simplified structure, eliminates the drawbacks of the conventional device, is cheaper, has a stronger structure, and is highly reliable.

Hereinafter, one embodiment of the present invention will be described based on the drawings of FIGS. 3 to 5.

Reference numeral 11 denotes a yoke formed in an annular shape from a metal material, and has a stepped slip ring attachment portion 11 on its outer peripheral surface.
a, and a coil 12 is housed concentrically at the outer edge.

Reference numeral 13 denotes an annular slip ring whose radial cross section is approximately square, and its inner peripheral surface and both left and right sides are covered with an insulating coating treated with insulating powder coating or insulating varnish coating. layer 14
is directly fixed to the slip ring mounting portion 11a of the yoke 11 by press-fitting or adhesive. A power feeding surface 14a is formed on the outer surface of this insulating coating layer 14.
A power feeding lug terminal 15 of the coil 12 is connected to a. Note that the power feeding surface 14a is formed by not performing insulation treatment in advance by masking, or by cutting the insulation coating layer 14 that has been subjected to insulation treatment. In addition, since the insulation coating layer 14 sufficiently exhibits its performance with a thickness of about 0.1 to 0.5 mm, the yoke 11
A slip ring 13 can be provided in the magnetic circuit 16 (shown by the chain line in FIG. 3). As a result, the slip ring 13 can also be used as a part of the magnetic circuit, and the size of the yoke 11 can be reduced, thereby making it possible to downsize the entire device. It is also possible to apply an insulating coating 14B to the outer peripheral surface of the slip ring as shown in 13A shown in FIG.

The case where the present invention is applied to the slip ring of an electromagnetic clutch has been described above, but it goes without saying that the invention can also be used in devices other than these devices that use this type of slip ring.

As described in detail above, the present invention is a power supply device in which a slip ring, in which an insulating film layer is formed on at least the surface facing the yoke by insulating powder coating, insulating varnish coating, etc., is fixed directly to the yoke. Therefore, the slip ring itself has an insulating coating layer and no separate insulating plate or insulator is required. This has the effect of simplifying the structure and reducing the number of parts, and also eliminates the need for molding or cutting required for attaching insulating plates, etc., simplifying and speeding up the manufacturing process. It can contribute to improving workability and lowering prices. In addition, since the slip ring itself has an insulating coating layer and is directly attached to the slip ring mounting part such as a yoke, reliability may decrease due to poor installation or processing of the insulating plate, etc., as in the past. This problem can be solved.
Furthermore, since the thickness of the insulating coating layer can be made extremely thin, it is possible to provide a slip ring in the magnetic circuit of the yoke. Therefore, the slip ring can also be used as a part of the magnetic circuit, which is extremely effective in reducing the size and weight of the entire device.

[Brief explanation of the drawing]

FIG. 1 is a sectional front view showing an embodiment of a conventional power supply device, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a sectional front view showing an embodiment of a power supply device according to the present invention. FIG. 4 is a side view of FIG. 3, and FIG. 5 is a sectional view showing the main parts of another embodiment of the slip ring of the device of the present invention. 11... Yoke, 12... Coil, 13... Slip ring, 14... Insulating coating layer.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In an electromagnetic clutch, etc., a slip ring with an insulating coating layer formed on at least the surface facing the yoke by insulating powder coating, insulating varnish coating, etc. is attached to the yoke. A power supply device such as an electromagnetic clutch that is directly fastened. (2) A power supply device such as an electromagnetic clutch according to claim 1, wherein the thickness of the insulating coating layer is approximately 0.1 to 0.5 mm.