JPS6216505Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an electromagnetic coupling device that uses electromagnetic force to start and stop the drive shaft of, for example, a car cooler compressor. The object of the present invention is to provide an electromagnetic coupling device that improves the abrasiveness of the friction surface with the armature.

That is, Fig. 1 is a side view partially showing a general electromagnetic coupling device in cross section, and Fig. 2 is a front view showing a conventional armature.
A stator 4 housing the coil 2 via the rotor 4 is rotatably opposed to the end face of the stator 1 with a predetermined gap therebetween, and is rotatably supported by a bearing 6. At a position facing the coil 2, a plurality of windows 4a are formed at predetermined intervals in the circumferential direction for cutting off the magnetic field, and furthermore, a drive shaft (not shown) is provided approximately at the center of the rotor 4. A shaft hole 4b for insertion is formed. Reference numeral 5 denotes a lining embedded and fixed in the end face of the rotor 4, and 7 an amatia that faces the end face of the lining 5 with a predetermined gap g in between. A plurality of slits 7a extending radially in the radial direction and a plurality of screw holes 7b into which a plurality of bolts 8 for fixing the armature 7 to the boss portion 10 are screwed are formed. Thus, spline teeth 10a are formed on the inner circumferential surface of the boss portion 10, and are constantly engaged with spline teeth 9a formed on the outer circumferential surface of the cylindrical hub 9. Reference numeral 11 denotes a slider that is semi-fixedly press-fitted onto the outer periphery of the spline teeth 9a of the hub 9 to maintain a constant gap g between the rotor 4 and the armature 7, and 12 the slider 11.
This spring is inserted between the armature 7 and the boss portion 10 to return the armature 7 to its original position.

Since a general electromagnetic coupling device is configured as described above, the rotor 4 is rotated by a drive shaft (not shown) inserted into the shaft hole 4b of the rotor 4, and at this time, the coil 2 is energized. When this is energized, the first
A magnetic flux "Φ" is generated in the magnetic path indicated by the broken line in the figure, and the armature 7 is strongly attracted to the lining 5 of the rotor 4 against the elastic force of the spring 12. Therefore, the rotation of the rotor 4 is caused by the armature 7 → the boss. part 10 and hub 9
The signal is transmitted to an output shaft (not shown) inserted into the hub 9 through the hub 9. When the coil 2 is deenergized, the armature 7 separates from the end face of the rotor 4, that is, the lining 5, due to the elastic force of the spring 12 and returns to its original state, and the output shaft inserted into the hub 9 stops. do.

As mentioned above, in a general electromagnetic coupling device, if the lining 5 and the armature 7 frequently come into contact with each other due to repeated energization and deenergization of the coil 2, slip heat is generated between the two. , especially in order to thermally expand the amateur 7.
The rotor 4 causes thermal strain in the circumferential direction and deforms into a wave shape.
The contact effect with the lining 5 deteriorates, and the torque transmission force decreases significantly.

Conventionally, as a means to prevent such a temperature rise, as shown in FIG. 2, a plurality of slits 7a extending radially in the armature 7 have been provided to increase the heat dissipation effect. The inner peripheral portion of the armature 7 without the slit 7a has a very poor heat dissipation effect and is easily deformed into a wave shape due to thermal strain. Therefore, the outer periphery of this armature 7 has no thermal distortion due to the heat dissipation effect of the slit 7a, and the contact effect with the lining 5 is good;
The inner peripheral part of the armature 7 has poor heat dissipation effect because there is no slit, and the contact effect with the lining 5 is poor due to deformation due to thermal distortion.As a result, the armature 7 that contacts the lining 5 has only the outer peripheral part on one side. This has the disadvantage that it causes uneven friction, which causes wear and tear, and the torque transmission force is significantly reduced. When the abrasive powder from the lining 5 and the amateur 7 enters the slider 11,
Since it becomes difficult to maintain the gap g constant,
Since the inner peripheral surface of the conventional armature 7 is made to be as close as possible to the outer peripheral surface of the hub 9, the magnetic flux Φ leaks and flows to the hub 9, the output shaft, the drive shaft, and the rotor 4, causing the electromagnetic coupling device. Among the characteristics, the so-called "cutting" of Amateur 7 often deteriorated.

This idea was made with attention to this point, and the armature 7, whose temperature rises due to contact with the lining 5 of the rotor 4, radiates heat on an average basis as a whole to prevent deformation due to thermal distortion. The present invention is intended to provide an electromagnetic coupling device that provides improved electromagnetic coupling.

That is, FIG. 3 is a front view of an armature 13 showing an embodiment of this invention, in which 13a is a plurality of slits extending radially inward from the outer periphery of the armature 13, and 13b is a slit inside the armature 13. A plurality of windows are formed near the periphery at predetermined intervals in the circumferential direction and extend long in the circumferential direction, and a part of the windows 13b are formed by each of the slits 1
3a, and is formed into a substantially T-shape to improve the heat dissipation effect and the thermal strain prevention effect.

Amateur 1 in the electromagnetic coupling device of this invention
3 is provided with a plurality of slits 13a extending radially inward from the outer periphery and a plurality of windows 13b at predetermined intervals in the circumferential direction near the inner periphery. Therefore, even if the temperature rises due to frequent contact and separation between the lining 5 and the armature 13, the armature 13 will not suffer from thermal distortion due to the heat dissipation effect and thermal distortion prevention effect due to the presence of the slit 13a and the window 13b. It does not cause partial deformation and reduce the torque transmission force between the lining 5 and the armature 13, but rather has an excellent practical effect of increasing the torque transmission force (connection work). be. Further, according to this invention, a plurality of windows 13 are provided near the inner peripheral edge of the armature 13 at predetermined intervals in the circumferential direction.
Since the window 13b is provided, the leakage of the magnetic flux Φ to the outer circumferential surface of the hub 9 is prevented by the presence of the window 13b, and the so-called "cutting" of the armature 13 is not deteriorated. Since the inner peripheral surface of the armature 13 can be brought as close as possible to the outer peripheral surface of the hub 9, it also has the effect of significantly reducing the amount of abrasion powder from the lining 5 and the armature 13 that enters the slider 11. There is. Further, each slit 13a of the armature 13 and a part of the window 13b are made to communicate with each other to form a substantially T-shaped portion, and fan-shaped portions separated by the slits 13a are cut from both sides by the T-shaped portion. Therefore, both ends of the fan-shaped portion on the slit side become free ends, making it easy to follow the mating lining 5. Therefore, it has the effect of greatly contributing to the stabilization of torque.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a general electromagnetic coupling device partially in section, FIG. 2 is a front view showing a conventional armature, and FIG. 3 is a front view of the armature according to this invention. In the drawing, 1 is a stator, 2 is a coil, 4 is a rotor, 5 is a lining, 13 is an armature, 13a
is a slit, and 13b is a window. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In an electromagnetic coupling device having a stator housing a coil, a rotor rotatably opposing the stator, and an armature opposing a lining fixed to the rotor with a predetermined gap, the armature is provided with an outer periphery. forming a plurality of slits extending radially inward from the armature, and a plurality of windows extending circumferentially at predetermined intervals in the vicinity of the inner peripheral edge of the armature and extending circumferentially;
Further, each of the slits and a portion of the window are made to communicate with each other to form a substantially T-shaped portion, and this T-shaped portion is formed.
An electromagnetic coupling device characterized in that fan-shaped portions separated by the slits are cut from both sides by the letter-shaped portions.