JPH0220498Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a magnetic particle type electromagnetic coupling device that transmits torque by filling the gap formed by a pair of coupling bodies with magnetic particles and applying a magnetic field to it. It's about structure.

This type of coupling has a number of advantages over friction couplings, among them the ability to control torque by varying the excitation current, and the possibility of continuous slip within the range permitted by heat capacity. It has the outstanding advantage of being able to be used in various ways.
Here, it is important to expand the allowable range of the heat capacity mentioned above for continuous slip use.

First, a conventional device of this type will be explained with reference to FIG. In FIG. 1, reference numeral 1 denotes a stator which is the second main body of connection, and has an excitation coil 2 built therein. 3
is a drive member which is the first main body of connection and is disposed with the stator 1 through a predetermined annular gap, and a bearing 6 is connected to the stator 1 by brackets 4 and 5 fixed to the stator 1 with bolts (not shown).
It is rotatably supported through. Reference numeral 7 indicates magnetic particles filled in the annular gap, and reference numeral 8 indicates a mounting plate to which the above-mentioned electromagnetic coupling device is attached using bolts 9.

Next, the operation of the above configuration will be explained. Note that this device is configured as a brake device. When the drive member 3 coupled to a drive source (not shown) is rotating, the stator 1 excites the built-in excitation coil 2 with a power supply device (not shown), as shown by the dotted line in the figure. A magnetic flux Φ is generated in the drive member 3, and the magnetic particles 7, which are part of this magnetic path, solidify and combine into a chain between the rotating drive member 3 and the stationary stator 1. , the drive member 3 is stopped or rotates while being braked. Frictional heat is generated by the slip at this time (hereinafter, the part where this frictional heat is generated is referred to as the operating surface).
Drive member 3, magnetic particles 7, and stator 1 are heated by this frictional heat. However, if the slip at this time is large and the generation of frictional heat becomes excessive, problems such as burnout of the excitation coil 2 built into the stator 1 and wave damage of the bearing 6 will occur.
Therefore, in order to keep the temperature rise of each part due to the frictional heat within a safe range, a usage limit is set for this device in terms of heat capacity. By the way, conventional methods for increasing this heat capacity usage limit include cooling with water, cooling with compressed air, and cooling with air from a blower, but all of these require a separate cooling device, which requires maintenance. This requires management and is extremely inconvenient. Furthermore, in terms of operation of the conventional device described above, the excitation coil 2 is connected to the atmosphere outside the device.
Since it is located radially inside the stator 1, etc., which has a built-in stator, it has disadvantages such as poor dissipation of frictional heat.

This idea was made in order to eliminate the drawbacks of the conventional device as described above.It brings the operating surface closer to the atmosphere outside the device, and uses the cooling air generated by the device itself to enhance the cooling effect and reduce heat capacity. It is an object of the present invention to provide a magnetic particle type electromagnetic coupling device that can expand the range of operation.

An embodiment of this invention shown in FIG. 2 will be described below. In FIG. 2, 11 is a stator which is the second main body of connection, and inside it is an exciting coil 1.
It has 2 built-in. Reference numeral 13 denotes a drive member which is a first connecting body provided radially outside the stator with a predetermined annular gap therebetween, and is fixed to the hollow shaft 14. 15 is a bracket attached to the stator 11 with bolts (not shown). 16 is a bearing, which is fitted into the stator 11 and the bracket 15;
The drive member 13 is rotatably supported via the hollow shaft 14. A retaining ring 17 prevents the bearing 16 from moving in the axial direction.
18 is a magnetic particle filled in the annular gap, 1
Reference numeral 9 denotes a mounting plate which is connected to the bracket 15 by fitting the spigot portion 15a of the bracket 15 with bolts 20 to hold the device. Here, the bracket 15 includes a disc-shaped member 15b located between the mounting plate 19 and the fan piece 13a of the drive member 13, and a disc-shaped member 15b that penetrates the disc-shaped member and is located on the fan piece 13a side. A ventilation passage 15c is provided that opens radially inward from the fan piece.

Next, the operation of the above configuration will be explained. Note that this device is also configured as a brake device like the above-mentioned conventional device.

When the drive member 13 is rotating together with the hollow shaft 14 connected to the drive source as in the conventional device described above, when the magnetic particles 12 built in the stator 11 are excited by the power supply device, as shown by the dotted line in the figure, , a magnetic flux Φ is generated in the stator 11 and the drive member 13, and the magnetic particles 1 that are part of this magnetic path
8 is solidified and connected in a chain between the rotating drive member 13 and the stationary stator 11 attached to the mounting plate 19 via the bracket 15, and the drive member 13 is stopped. , or rotate while being braked. At this time, frictional heat is generated on the operating surface as in the conventional device.

Here, this frictional heat is dissipated into the atmosphere from the drive member 13 located radially outward from the operating surface, and from the stator 11 located radially inward from the operating surface via the bracket 15 to the atmosphere and to the mounting plate 19. Become so. At this time, a large amount of cooling air is applied to the drive member 13, and the bracket 15,
The better the mounting plate 19 is cooled, the better the dissipation of frictional heat becomes.

Here, in the present invention, the drive member 13
When the fan piece 13a rotates, atmospheric air (cooling air) circulates as shown by the arrow in the figure due to the centrifugal action of the fan piece 13a. That is, on the side opposite to the mounting plate of this device, from the side surface of the drive member 13 toward the outer periphery as shown by arrow A, and on the mounting plate side, as shown by arrow B, the ventilation path extends from the mounting plate side of the disc-shaped member 15b of the bracket. 1
5c, and flows from the inner circumferential side to the outer circumferential direction of the fan piece 13a. During this time, drive member 1
3 side and outer circumference, mounting plate 19, bracket 1
5 to efficiently cool it.

Further, as shown in FIG. 3, if heat dissipation fins 15d are installed in the ventilation passage 15c, the cooling effect of the bracket 15 can be further enhanced.

As described above, according to this invention, the operating surface is provided near the outer periphery, a substantially U-shaped fan piece is provided in the radial direction of the outer periphery of the drive member, and the left and right edges connected thereto, and a disc-shaped member is provided on the bracket. By providing a ventilation path that communicates from the outer peripheral side of the mounting plate of the disc-shaped member to one side of the fan of the drive member, cooling air can be efficiently distributed, increasing the cooling effect of each part by these cooling air, and eventually It is possible to lower the temperatures of the stator, excitation coil, and bearing, and to provide a device in which the usable range in terms of heat capacity is greatly increased.

In the above embodiment, a brake device was explained as a magnetic particle type electromagnetic coupling device, but the same applies to a clutch device as another application example. In this case, a bearing or the like is installed between the bracket 15 and the mounting plate 19. The stator 11 connected to the bracket 15 may be made rotatable, and a slip ring or the like for power supply may be provided.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional magnetic particle electromagnetic coupling device, Fig. 2 is a sectional view showing one embodiment of this invention, and Fig. 3 is a sectional view showing another embodiment of this invention. This is a side view (b). In the figure, 11 is a stator, 12 is an exciting coil, 1
3 is a drive member, 13a is a fan piece, 14 is a hollow shaft, 15 is a bracket, 15a is a spigot,
15b is a disc-shaped member, 15c is a ventilation path, 15d is a heat radiation fin, 16 is a bearing, 18 is a magnetic particle, and 19 is a mounting plate. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) A first connecting body 13 having a substantially U-shaped fan piece 13a covering the radial direction of the outer periphery as well as its left and right edges, and a hollow shaft fastened to the first connecting body 13. 14. A second connecting body 11 that is disposed radially inwardly with respect to the first connecting body 13 with a predetermined annular gap therebetween and has an excitation means 12 built therein;
The annular gap is filled with magnetic particles 18, a bracket 15 is fastened to the second connecting body 11 and supports the device on a mounting plate 19, etc., and a hollow axis 1
One bearing 16 supports the first connecting body 13 through a hollow shaft 14, and another bearing 16 supports the first connecting body 13 through a hollow shaft 14 near the following ventilation passage 15c provided in the bracket 15. The bracket 15 is provided with a disc-shaped member 15b located between the mounting plate 19 and the first connection main body 13, and the mounting plate 19 extends through the disc-shaped member 15b. A ventilation passage 15c is provided that is not blocked by the fan piece 13a and is located radially inward from the fan piece 13a, so that the cooling air generated by the rotation of the fan piece 13a flows from the side opposite to the mounting plate to the first connecting body 13. to the outer periphery and the disk-shaped member 15
b from the outer circumferential side of the mounting plate 19 to the ventilation passage 15
A magnetic particle type electromagnetic coupling device characterized in that the magnetic particle type electromagnetic coupling device is configured to flow through c to the first coupling main body 13 side. (2) Heat dissipation fin 1 in the ventilation passage 15c of the bracket
5d. The magnetic particle type electromagnetic coupling device according to claim 1, which is a utility model.