JPS6120328Y2 - - Google Patents

Description

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

First, the structure of the conventional device will be explained with reference to FIG. In Figure 1, 1 is the compressor frame;
A plate 2 is fixed to the machine frame 1 with bolts 3. Reference numeral 4 denotes an annular stator, which is fixed to the plate 2 by welding or the like. 5 is resin 6
excitation coil fixed by 7, rotor 7a
7b is an annular groove for interrupting magnetism; 7c is a groove for inserting the toe wafer 8; 9 is inserted between the tome wafers 8. a bearing 10 fitted into the cylindrical portion 1a of the compressor 1;
is an armature 12 supported by a leaf spring 11 provided opposite to the rotor 7 through a gap g;
A boss is fixed to the rotating shaft 13 via a key 14 in the circumferential direction, and is fixed in the axial direction by a nut 15. 16 and 17 are rivets for fixing the leaf spring 11 to the armature 10 and the boss 12;
8 is a bush for controlling the position of the armature 10, and the leaf spring 11 and the bush 18 are provided at several locations around the entire circumference.

The operation of the structure described above will be explained next. First, when the excitation coil 5 is deenergized, the rotor 7 continues to rotate due to the drive source;
The armature 10 is pushed 18 by the leaf spring 11.
and is opposed to the rotor 7 with a gap g interposed therebetween. Therefore, the rotating shaft 13 is stopped,
There is no rotation of the compressor. Next, when the excitation coil 5 is energized, a magnetic flux Φ is generated as shown by the dotted line in the figure, and the armature 10 is attracted and adhered to the rotor 7 against the elastic force of the leaf spring 11, and the rotational force is transferred to the plate. It is transmitted to the rotating shaft 13 via the spring 11 and the boss 12. The above operations are used repeatedly.

In the structure and operation described above, the tow 8 is used as a method for fixing the bearing 9. However, with this method, it is of course necessary to arrange the tow 8.
To ensure the thickness of the plate and the groove 7c, the collar 7 is
d is required, which increases the dimension in the thrust direction and increases the weight. Furthermore, even in the case of mass production, the part where the tomewa 8 is inserted becomes a bottleneck and is difficult to automate.

Therefore, in order to improve these defects, the caulking method shown in Fig. 2 was adopted, but in this case, a bulge occurred in the caulked part 7e as shown by the dotted line in the figure.
This bulge deforms the bearing 9, making it difficult to maintain the performance of the bearing 9, which is a quality problem. In other words, the races of the bearing 9 were deformed and the radial gap changed, making it impossible to rotate smoothly and causing seizure.
The system shown in Fig. 3 below is a further improvement of the method shown in Fig. 2, and a patch plate 19 is provided to prevent the above deformation from reaching the bearing 9, but this requires the patch plate 19. Costs were becoming high.

This invention has been made in view of the above points, and one embodiment of this invention shown in FIG. 4 will be described. 20 is an enlarged portion of the rotor, and 20a is an annular groove provided in the insertion portion of the bearing 9, which is provided at approximately the same position as the end surface of the bearing 9. 20b is a caulking portion, and 20c is an annular window for blocking magnetism.

In the structure described above, the operation is the same as that of the conventional one, and the caulking of the bearing 9 is also the same as that of the conventional one, but measures have been taken to prevent deformation (bulging) of the caulked portion. That is, the annular groove 20a provided on the inner periphery of the rotor at substantially the same position as the end face of the bearing 9 allows the bulge to escape and prevent it from reaching the fitting surface of the bearing. In other words, the annular groove allows the bulge to escape and the caulked portion comes into contact with the end face of the bearing 9. This method does not require any additional parts, is easy to carry out, provides stable bearing performance in terms of quality, and is also inexpensive, lightweight, and compact.

Although the starting device has been described above, it can also be used as a braking device by fixing one side, and the caulking portion is effective whether the entire circumference or a portion thereof is used.

As described above, an annular groove is provided on the inner periphery of the rotor, which is the fitting surface of the bearing, at almost the same position as the end face of the bearing, and deformation caused by caulking is escaped by this annular groove, making it easy and inexpensive to install the bearing. can be fixed, which has the effect of contributing to weight reduction and compactness.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view showing a conventional electromagnetic coupling device, Figs. 2 and 3 are partially enlarged views showing other conventional examples, and Fig. 4 is a partially enlarged view showing an embodiment of this invention. . In the figure, 4 is a stator, 5 is an excitation coil, 9 is a bearing, 10 is an amateur, 20 is a rotor, 20
a is an annular groove, and 20b is a caulking portion. In the figure,
The same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A rotor, an armature that faces the rotor via a gap and is movable in the axial direction, a bearing built into the inner periphery of the rotor, and an excitation device that brings the rotor and armature into pressure contact, An electromagnetic coupling device characterized in that an annular groove for releasing deformation of a race surface is provided in a caulking portion for fixing the bearing on the inner circumference of the rotor.