JPH08247172A - Magnetic grain-type torque transmitting device - Google Patents

Abstract

PURPOSE: To provide a magnetic grain-type torque transmitting device having the small size and the long life by effectively radiating heat generated on a coil or magnetic grains. CONSTITUTION: A heat conductive member 21 made of materials having heat conductivity higher than that of an inner connecting main body 20 is provided on the inner connecting main body 20. A cooling fin 22 for radiating heat is attached to the heat conductive member 21, a hole 23 and a cooling fan 24 for forming a conductive passage are provided on a casing composed of a yoke 2 and a bracket 13, and the cooling fin 22 is arranged on the conductive passage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic particle type torque transmission device used in general industrial machines and the like.

[0002]

2. Description of the Related Art FIG. 4 is a partial sectional view showing a conventional magnetic particle type torque transmitting device, here, a magnetic particle type clutch. In the figure, reference numeral 1 denotes a cylindrical coil for generating a magnetic field by supplying an electric current from the outside, which is also housed in a yoke 2 as a cylindrical fixed main body. The yoke 2 is made of carbon steel which is a magnetic body. ing. The rotor 3 as a cylindrical outer connecting main body is arranged inside the yoke 2 and concentrically with the yoke 2, and is made of carbon steel which is a magnetic material. The rotor shaft 4 is integrally connected to the rotor 3 and is also connected to an external rotating body (not shown). The first bracket 6 mounts the rotor shaft 4 on the bearing 5
It is rotatably supported by the yoke 2 via.

The disc-shaped plate 7 covers the opening of the rotor 3 which is mainly connected to the outside and which opens to the left side in the figure, and the outer diameter portion 7a of the plate 7 is fixed to the rotor 3. , The inner diameter portion 7b is a small diameter portion 8a of the inner connecting main body 8 (described later).
A labyrinth seal is formed between and to prevent magnetic particles 10 (described later) from leaking to the outside. The inner rotor 8 serving as the inner connecting main body is arranged inside the rotor 3 serving as the outer connecting main body, concentrically with the rotor 3 and with a cylindrical gap 9 provided between the inner rotor 8 and the rotor 3. . The inner rotor 8 is made of carbon steel, which is a magnetic material, and has a small diameter portion 8
a. In addition, in the cylindrical gap 9 provided between the inner peripheral surface of the rotor 3 and the outer peripheral surface of the inner connecting main body 8,
Magnetic particles 10 (iron powder or the like) are filled. The second rotor shaft 11 is fixed to the inner rotor 8 coaxially with the inner rotor 8 and is connected to a load (not shown). The second bracket 13 mounts the second rotor shaft 11 on the bearing 12
It is rotatably supported via.

Next, the operation of the conventional device will be described. Power is transmitted from an external rotor (not shown) to the rotor 3, which is the main body of the outer connection, through the rotor shaft 4, and the rotor 3
Is spinning. When no current is flowing through the coil 1, the magnetic particles 10 in the gap 9 between the rotor 3 and the inner rotor 8 are not solidified, so that friction does not occur between the rotor 3 and the inner rotor 8. , The inner rotor 8 does not rotate. When an electric current is passed through the coil 1, a magnetic field whose magnetic path is as shown by the dotted line 14 is generated. The magnetic particles 10 are solidified by this magnetic field, and the solidified magnetic particles 10 cause friction between the rotor 3 and the inner rotor 8, which friction causes the first rotating shaft 4 to the second rotating shaft 11 to rotate. Torque is transmitted to and acts as a clutch. At this time, frictional heat is generated in the magnetic particles 10, and this frictional heat is transmitted through the air having poor conductivity to the yoke 2,
Heat is dissipated from the first bracket 6 and the second bracket 13. When a current flows through the coil 1, Joule heat is generated in the coil 1, the Joule heat is transmitted from the coil 1 to the yoke 2, and is radiated from the yoke 2 to the outside.

[0005]

Since the conventional magnetic particle type torque transmitting device is constructed as described above, the frictional heat generated in the magnetic particles 10 is extremely poor in heat dissipation. For this reason, the temperature of the magnetic particles 10 rises and they are easily oxidized. If the magnetic particles 10 are heavily oxidized, the life of the device will be shortened. For this reason, in order to suppress the temperature rise, the inner rotor 8 must be made large, and the overall size of the device cannot be reduced. Moreover, since the Joule heat generated in the coil 1 is transmitted to the yoke 2 and is radiated to the outside from the yoke 2, it is necessary to enlarge the coil 1 and the yoke 2 to improve the heat radiation. There was a problem.

The present invention has been made to solve the above problems, and provides a magnetic particle type torque transmission device which is small in size and has a long life by effectively radiating heat generated in magnetic particles. The purpose is to It is another object of the present invention to provide a magnetic particle type torque transmission device that can cool a fixed main body provided with a coil well and can be downsized.

[0007]

In the magnetic particle type torque transmitting device according to the invention of claim 1, a cooling fin is provided on the inner connecting main body.

According to a second aspect of the present invention, a heat conducting member made of a material having better heat conduction than the inner connecting main body is provided between the inner connecting main body and the cooling fin.

According to the third aspect of the present invention, a hole is formed in the outer peripheral portion of the casing composed of the fixed main body and the bracket, the hole forming the cooling air flow passage.

According to a fourth aspect of the present invention, the inner connecting main body is provided with a cooling fin for radiating the heat of the inner connecting main body, and the inner connecting main body and the cooling fin are formed of a material having a better heat conduction than the inner connecting main body. A heat conducting member is provided, a casing including a fixed main body and a bracket is provided with a hole for forming a flow passage through which cooling air can pass, and cooling fins are arranged on the flow passage.

According to a fifth aspect of the present invention, a cooling fan is provided in a hole on the outer peripheral surface of the casing forming a cooling air flow passage.
The fixed main coil and the outer connecting main body are directly cooled by a cooling fan.

According to a sixth aspect of the present invention, a cooling fan is arranged in a hole on a side surface of the casing forming the cooling air flow passage, and the cooling fin is directly cooled by the cooling fan.

According to a seventh aspect of the present invention, in order to allow the cooling air of the cooling fan arranged in the hole on the side surface of the casing to flow to the outer periphery of the fixed main body, the casing is provided with a cover or a notch to guide the cooling air. It forms a passage.

[0014]

According to the first aspect of the present invention, by providing the cooling fin on the inner connecting main body, frictional heat is transmitted from the magnetic particles to the cooling fin, and the temperature rise of the magnetic particles is reduced.

According to the second aspect of the present invention, the inner connecting main body is provided with the cooling fins, and the heat conducting member formed of a material having a higher thermal conductivity than the inner connecting main body is provided between the inner connecting main body and the cooling fins, thereby providing friction. Heat is easily transferred from the magnetic particles to the cooling fins, and the temperature rise of the magnetic particles is reduced.

According to the third aspect of the present invention, by providing a hole for forming a cooling air guiding passage in the outer peripheral portion of the casing composed of the fixing body and the bracket, the cooling air passes through the guiding passage and The coil can be cooled effectively.

In the invention of claim 4, since the cooling fins are provided on the inner connecting main body, and the heat conducting member made of a material having better heat conduction than the inner connecting main body is provided between the inner connecting main body and the cooling fins. Friction heat is easily transferred from the magnetic particles to the cooling fins, and the temperature rise of the magnetic particles is reduced.
Further, the casing including the fixed main body and the bracket is provided with a hole for forming a guide passage for cooling air, and the cooling fins are provided on the guide passage. And the cooling fins can be effectively cooled.

In the fifth aspect of the invention, since the coil of the fixed main body and the outer connecting main body can be directly cooled by the cooling fan, the coil can be efficiently cooled, and the magnetic property can be improved by cooling the outer connecting main body. The temperature rise of the particles is effectively reduced and the oxidation of the magnetic particles is prevented.

In the invention of claim 6, since the cooling fins can be directly cooled by the cooling fan, the temperature rise of the magnetic particles can be effectively reduced through the cooling fins.
Oxidation of magnetic particles is prevented.

In the invention of claim 7, the cooling fan directly cools the cooling fins and the cooling air passes through the outer periphery of the fixed main body, so that the temperature rise of the magnetic particles is reduced and the oxidation of the magnetic particles is prevented. At the same time, the fixed main coil is effectively cooled.

[0021]

【Example】

Example 1. 1 is a partial cross-sectional view showing a magnetic particle type torque transmitting device according to a first embodiment of the present invention, here, a magnetic particle type clutch. In the figure, an inner rotor 20 as an inner connecting main body is made of carbon steel and has a rotatable cylindrical shape, and a heat conducting member 21 is fixed to an inner peripheral portion thereof. The heat conducting member 21 is made of copper having a thermal conductivity about 5 times that of carbon steel (inner rotor 20), and has a large contact area with the inner rotor 20 due to shrink fitting or the like. Are fitted in good condition. Further, a cooling fin 22 (a lightweight and highly heat conductive aluminum or the like is used) is attached to the heat conduction member 21 by a bolt, a shrink fit or the like outward in the radial direction of rotation. The cooling fin 22 may be either a disk-shaped fin or a plurality of radial fins, and in the case of a disk-shaped fin, a hole 22a for passing cooling air may be provided. The yoke 2 which is the fixed body
Is provided with a hole 23 that forms a flow passage for cooling air, and a cooling fan 24 that cools the coil 1 in the yoke 2 is provided on the outer peripheral portion thereof. Second bracket 1
An air flow sensor 25 is provided inside the cooling fan 2
4 detects the air volume of the cooling air and sends a signal to the alarm device 26 via the connection line 27.
A warning sound is generated by a signal from 5. Since other configurations are similar to those of the conventional device shown in FIG. 4, corresponding components are designated by the same reference numerals and description thereof is omitted.

In the magnetic particle type clutch constructed as described above, the frictional heat generated in the magnetic particles 10 is transmitted from the magnetic particles 10 to the inner rotor 20, and from the inner rotor 20 via the heat conducting member 21. It is transmitted to the cooling fins 22. In this case, since the heat conducting member 21 is made of copper, which has a good heat conductivity, the thermal resistance becomes about 1/5 of that of the case where the same carbon steel as the inner rotor 20 is used, and the temperature of the magnetic particles 10 is reduced. The rise is kept low. Further, the cooling air blown out from the cooling fan 24 as shown by the arrow 28a passes through the hole 23 of the flow passage formed in the yoke 2 to effectively cool the yoke 2 and the coil 1, and the yoke 2 as shown by the arrow 28b. The cooling fin 22 attached to the heat conduction member 21 through the space between the outer rotor 3 and the outer rotor 3 and the lead-out hole 3 as shown by an arrow 28c.
It is released from 0 to the outside. Furthermore, the air flow sensor 25 detects the air flow of the cooling air sent from the cooling fan 24, sends a signal to the alarm device 26 through the connection line 27, and emits a warning sound when the air flow falls below a certain value.

Embodiment 2 FIG. FIG. 2 is a partial cross-sectional view showing a magnetic particle clutch according to the second embodiment. In this embodiment, a hole 13 a for introducing cooling air is provided in the wall portion of the second bracket 13 facing the cooling fin 22 and a cooling fan 24 is installed. In addition, the yoke 2 of the second bracket 13
On the side, a flow passage 13b for passing cooling air is provided, and the yoke 2
A cutout 33 for guiding the cooling air to the outer circumference of the yoke is provided on the side of the flow passage 13b. Since the other configurations are the same as those of the first embodiment shown in FIG. 1, the corresponding components are designated by the same reference numerals and the description thereof will be omitted.

In the second embodiment, the frictional heat generated in the magnetic particles 10 is transmitted through the inner rotor 20 to the heat conduction member 21 adjacent to the inner side of the inner rotor 20. On the other hand, the cooling air blown out from the cooling fan 24 as indicated by the arrow 32a flows as indicated by the arrow 32b and flows into the heat conducting member 3 as shown in FIG.
The cooling fin 22 in contact with 1 is cooled and flows into the flow passage 13b. Here, if the yoke 2 does not have the notch 33, the yoke 2 flows as shown by a dotted arrow 32d, and the yoke 2 is cooled only on one side surface, and the temperature rises where the cooling air does not hit. When the notch 33 is formed in the yoke 2, cooling air flows as shown by an arrow 32c, the yoke 2 is cooled not only on one side surface but also the entire outer periphery, and the yoke 2 and the coil 1 are efficiently cooled.

Example 3. FIG. 3 is a partial sectional view showing a magnetic particle type clutch according to the third embodiment. In the present embodiment, a cylindrical cover 53 is joined to the yoke 2 side (right side in the drawing) of the second bracket 13, and this cover 53 is the yoke 2.
Is arranged so as to cover the outer circumference of the yoke 2, and an axial flow passage 54 is formed on the outer circumference of the yoke 2. Since the other configurations are the same as those of the first embodiment shown in FIG. 1, the corresponding components are designated by the same reference numerals and the description thereof will be omitted.

In Example 3, the frictional heat generated in the magnetic particles 10 is transmitted to the heat conducting member 21 via the inner rotor 20. On the other hand, the cooling air blown out from the cooling fan 24 as shown by the arrow 52a cools the cooling fins 22 in contact with the heat conducting member 31, and the flow passage 54 between the cover 53 and the yoke 2 is shown by the arrow 52b. So that it flows axially. Then, the entire outer peripheral surface of the yoke 2 is effectively cooled, and heat is radiated to the outside as shown by an arrow 52c.

Other Embodiments. In each of the above-described embodiments, the heat conducting member is made of copper, but aluminum or other material having good heat conduction may be used. Further, the heat conduction member may be composed of a plurality of members.

In each of the above embodiments, the cooling fins are fixed to the heat conducting member by bolts or shrink fit, but they may be integrally formed of the same member (copper, etc.) as the heat conducting member. good.

Further, in each of the above embodiments, a material having a lower magnetic property than the inner connecting main body is used for the heat conducting member so that the magnetic path of the magnetic field generated by the coil can efficiently pass through the inner connecting main body. Is also good.

[0030]

Since the present invention is constructed as described above, it has the following effects.

According to the first aspect of the present invention, since the cooling fins are provided on the inner connecting main body, frictional heat is transmitted from the magnetic particles to the cooling fins, and the temperature rise of the magnetic particles is reduced.

According to the second aspect of the present invention, the cooling fins are provided on the inner connecting main body, and the heat conducting member made of a material having better heat conduction than the inner connecting main body is provided between the inner connecting main body and the cooling fins. Therefore, the frictional heat is easily transferred from the magnetic particles to the cooling fins, the temperature rise of the magnetic particles can be prevented, the oxidation of the magnetic particles can be prevented, and the life of the magnetic particle type torque transmission device can be extended.

According to the third aspect of the present invention, the casing including the fixed main body and the bracket is provided with a hole for forming the cooling air guiding passage, and the cooling air is guided through the guiding passage. The coil can be efficiently cooled, and the coil and the fixed main body can be downsized.

According to the fourth aspect of the present invention, the cooling fins are provided on the inner connecting main body, and the heat conducting member made of a material having better heat conduction than the inner connecting main body is provided between the inner connecting main body and the cooling fins. Therefore, frictional heat is easily transferred from the magnetic particles to the cooling fins, and the temperature rise of the magnetic particles is reduced.
Further, the casing including the fixed main body and the bracket is provided with a hole for forming a guide passage for cooling air, and the cooling fins are provided on the guide passage. And the cooling fins can be effectively cooled.

According to the fifth aspect of the invention, since the coil of the fixed main body and the outer connecting main body can be directly cooled by the cooling fan, the coil can be efficiently cooled, and the outer connecting main body is passed through. The temperature rise of the magnetic particles is effectively reduced and oxidation of the magnetic particles is prevented.

According to the invention of claim 6, the cooling fin can directly cool the cooling fin, so that the temperature rise of the magnetic particles can be effectively reduced through the cooling fin.
Oxidation of magnetic particles is prevented.

According to the invention of claim 7, the cooling fan directly cools the cooling fins and the cooling air passes through the outer periphery of the fixed main body, so that the temperature rise of the magnetic particles is reduced and the oxidation of the magnetic particles is prevented. At the same time, the fixed main coil is effectively cooled.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a magnetic particle type torque transmission device according to a first embodiment of the present invention.

FIG. 2 is a partial sectional view showing a magnetic particle type torque transmission device according to a second embodiment of the present invention.

FIG. 3 is a partial sectional view showing a magnetic particle type torque transmission device according to a third embodiment of the present invention.

FIG. 4 is a partial cross-sectional view showing a conventional magnetic particle type torque transmission device.

[Explanation of symbols]

1 coil, 2 yokes, 3 rotors, 7 plates,
9 gap, 10 magnetic particles, 20 inner rotor, 21
Heat conduction member, 22 cooling fins, 23 flow passage, 2
4 cooling fan, 33 cutout, 53 cover, 54
Leading passage.

Claims (7)

[Claims] 1. A rotatably provided cylindrical outer connecting main body, and an inner connecting main body made of a magnetic material, arranged concentrically inside the outer connecting main body, and having a gap with the outer connecting main body. And a magnetic particle type torque transmission device including magnetic particles that fill the gap and are solidified by a magnetic flux generated by a coil to generate friction between the outer connecting main body and the inner connecting main body. A magnetic particle type torque transmission device characterized in that a cooling fin for radiating heat of the inner connection main body is provided. 2. The magnetic particle according to claim 1, further comprising a heat conducting member formed between the inner connecting main body and the cooling fin, the heat conducting member being made of a material having better thermal conductivity than the inner connecting main body. Torque transmission device. 3. A casing composed of a fixed main body, which is formed of a cylindrical magnetic material and provided with a coil, and a bracket, a cylindrical outer connecting main body rotatably provided inside the fixed main body, and a magnetic material. An inner connecting main body that is formed and arranged concentrically inside the outer connecting main body and that has a gap with the outer connecting main body; and the outer connecting main body and the inner side that are filled in the gap and solidified by the magnetic flux generated by the coil. In a magnetic particle type torque transmission device provided with magnetic particles for generating friction between connecting main bodies, a hole is formed in the outer peripheral portion of the casing to form a flow passage, and cooling air is allowed to pass therethrough. Magnetic particle type torque transmission device. 4. A casing composed of a fixed main body, which is made of a cylindrical magnetic material and provided with a coil, and a bracket, a cylindrical outer connecting main body rotatably provided inside the fixed main body, and a magnetic material. An inner connecting main body that is formed and arranged concentrically inside the outer connecting main body and that has a gap with the outer connecting main body; and the outer connecting main body and the inner side that are filled in the gap and solidified by the magnetic flux generated by the coil. In a magnetic particle type torque transmission device provided with magnetic particles for generating friction between connecting main bodies, a cooling fin for radiating heat of the inner connecting main body is provided on the inner connecting main body, and the inner connecting main body and the cooling fins are provided. A heat conducting member made of a material having better heat conduction than that of the inner connecting main body is provided between them, and a flow passage for allowing cooling air to pass through the casing is provided. Provided with a bore formed, magnetic particles torque transmitting device, characterized in that were provided with the cooling fins on the conductor distribution path. 5. A cooling fan is disposed in an outer peripheral hole forming a cooling air flow passage of the casing, and the fixed main body coil and the outer connecting main body are directly cooled by the cooling fan. The magnetic particle type torque transmission device according to claim 4. 6. The magnetic device according to claim 4, wherein a cooling fan is provided in a hole on a side surface of the casing forming a cooling air flow passage, and the cooling fins are directly cooled by the cooling fan. Particle type torque transmission device. 7. The magnetic particle type torque transmission device according to claim 6, wherein a guide passage is formed to allow cooling air of the cooling fan to flow to the outer periphery of the fixed main body.