JPS6221780Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of the pulley portion of an electromagnetic coupling device.

First, a conventional electromagnetic coupling device will be explained with reference to FIG. In FIG. 1, 1 is a stator fixed to a machine frame 2 such as a compressor, 3 is an excitation coil molded onto the stator 1 with resin 4, and 5
The rotor is formed in a U-shape, and slits 5a are provided at several locations in the inner circumferential direction to block magnetism. 6 is a bearing inserted into the cylindrical part 2a protruding from the machine frame 2 to support the rotor 5, 7a and 7b are pulleys fixed to the outer periphery of the rotor 5 by welding 8, and 7c and 7d are the total number of revolutions of the pulley. A notch 9 provided at a location is an armature 10 facing the rotor 5 through an axial gap g.
11 is a rotary shaft protruding from the machine frame 2; 11 is a boss fixed to the rotary shaft 10 by a key 12; 13 is a leaf spring whose both ends are fixed to the armature 9 and the boss 11 by rivets 14, 15; These are bushes for regulating the position of the armature 9, and are provided at several locations all around the circumference.

Next, the operation of the structure described above will be explained. First, when the excitation coil 3 is deenergized, the armature 9 is in contact with the bush 16 due to the elastic force of the leaf spring 13. Therefore, rotor 5
and amateur 9 are facing each other through a gap g,
There is no transmission force from pulleys 7a and 7b.

Next, when the excitation coil 3 is energized, a magnetic flux Φ is generated in the magnetic path shown by the dotted line, and the armature 9 is connected to the leaf spring 1.
It is attracted to the rotor 5 against the elastic force of 3. Therefore, the transmission force from the pulleys 7a and 7b is transmitted to the rotating shaft 10 via the rotor 5, armature 9, leaf spring 13, and boss 11. Next, when the excitation coil 3 is deenergized again, the armature 9 comes into contact with the bush 16 due to the elastic force of the leaf spring 13.

The above-mentioned devices had the following problems. That is, the pulleys 7a and 7b are formed by press working, and the mating surfaces of the pulleys 7a and 7b are lathed to match, and then welded 8.
is fixed to the rotor 5. Afterwards, plating is applied to prevent rust. However, at this time, the plating liquid intrudes from the mating surface between the pulleys 7a and 7b, but this infiltrated plating liquid, such as acid, may come out after plating and damage the plating surface, resulting in rust. was something that developed rapidly. In order to avoid this, notches 7c and 7d are created by milling etc. to quickly release the plating liquid that has entered, but this is not perfect and also requires milling, so the machining process is slow. The disadvantages are that it is complicated and costly.

This idea was made in consideration of the above points,
By welding the pulleys together, the above drawbacks are solved. Below is a second example of this invention.
The diagram will be explained. That is, in this invention, welding 17 is applied to the entire outer circumference of the seam between pulleys 7a and 7b.
However, the pulleys 7a and 7b are integrated, and the outer circumferences of the side surfaces of the pulleys 7a and 7b and the rotor 5 are welded over the entire circumference. Note that the other parts are the same as the conventional one, so explanations will be omitted.

In the above structure, the pulleys 7a, 7
By performing welding 17 all around the outer circumference of the seam b, it is possible to completely prevent the plating liquid from penetrating, and there is a work step 8 in which the pulleys 7a, 7b and the rotor 5 are welded. Since this work can be done at the same time, the process is not complicated at all and can be manufactured at low cost. Furthermore, the pulley 7a,
7b has a force that pushes them against each other, so it becomes stronger, and the thickness of the material can be reduced accordingly,
This results in a reduction in material costs.

As described above, according to this invention, the pulleys are welded to each other along the entire circumference of the joint of their outer diameters, and the sides of the pulley are welded to the rotor, so even if plating is applied, the plating liquid will not It has many practical effects, such as being able to completely prevent infiltration, not corrode the plated surface, and being highly effective in preventing rust. It also increases the strength of the pulley and can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing a conventional electromagnetic coupling device, and FIG. 2 is a partial sectional view showing an embodiment of this invention. In the figure, 1 is a stator, 3 is an excitation coil, 5 is a rotor, 7a, 7b are pulleys, 9 is an armature, 17
is the welded part. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A rotor, armatures that are movably arranged in opposition to each other in the axial direction of the rotor through a gap, an excitation device that brings the rotor and armature into pressure contact, and a plurality of pulleys that are arranged adjacent to each other on the outer periphery of the rotor. An electromagnetic coupling device characterized in that the outer periphery of the mating surfaces between the pulleys and the entire periphery between the side surfaces of the pulleys and the rotor are welded watertightly.