JPH0338453B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is characterized in that magnetic particles are filled between a first connecting body and a second connecting body, and the magnetic particles are magnetized and transmitted between the two connecting bodies. The present invention relates to an electromagnetic coupling device that generates torque, and particularly to its cooling structure.

[Conventional technology]

FIG. 3 is a cross-sectional side view showing the schematic configuration of a conventional electromagnetic coupling device shown, for example, on pages 2-2 to 2-5 of "Mitsubishi Electromagnetic Clutches and Brakes (General Catalog), September 1985". In the figure, 1 is an annular first connecting body (hereinafter referred to as a ring drive) that is attached to a rotating shaft 2 driven by a prime mover (not shown) and rotates in conjunction with the rotating shaft 2;
Reference numeral 3 denotes a second connecting body (hereinafter referred to as "driven") disposed on the inner peripheral side of the ring drive 1 on a concentric axis with an annular gap in between, and serves as a magnetic flux circuit on the fixed side. Reference numeral 4 denotes magnetic particles filled in the annular gap between the ring drive 1 and the driven 3. When magnetized, the magnetic particles 4 become solid and serve as a torque transmission medium between the ring drive 1 and the driven 3.
Reference numeral 5 denotes an excitation device disposed on the outer circumferential side of the ring drive 1, which is composed of an excitation coil 6 and a stator 7, and generates magnetic flux by energizing the excitation coil 6, magnetizes the magnetic particles 4, and causes the ring drive 1 to move. A transmission torque is generated between the drive 3 and the drive 3. 8
is a fixing attachment member attached to one side of the stator 7 of the excitation device 5, which is attached to a fixed part (not shown) and supports the rotating shaft 2 with a bearing 9 interposed between it and the rotating shaft 2. Reference numeral 10 designates a bracket that connects and secures the other side of the stator 7 of the excitation device 5 and the driven 3, and has through holes 10a and 10b formed therein. 11 is a plate that closes the opening of the ring drive 1 and rotates in conjunction with the ring drive 1; 12 is a heat dissipation fin attached to the plate 11;

Next, the operation will be explained. Now, when the rotating shaft 2 is rotating, the ring drive 1 is also rotating. When the excitation coil 6 of the excitation device 5 is energized in this state, a strong magnetic flux Φ is generated with the stator 7, ring drive 1, and driven 3 as a circuit, and the annular air gap between the ring drive 1 and the driven 3 is generated. The filled magnetic particles 4 are magnetized, bundled, and solidified. At this time, the torque of the ring drive 1 is transmitted to the driven 3 due to the direct coupling force between the magnetic particles 4 and the friction force between the magnetic particles 4 and the ring drive 1, or the contact surface between the magnetic particles 4 and the driven 3, and the ring drive 1 braking force is applied to. this driven 3
The braking torque generated is transmitted to the mounting member 8 via the bracket 10 and the stator 7. The mounting member 8 is attached to an external fixed part, and the braking torque transmitted from the drive 3 is transmitted to the fixed part. Therefore, Ring Drive 1 and Driven 3
are coupled by the magnetized magnetic particles 4, and the ring drive 1 rotates while being braked or stops rotating. In other words, the brakes are applied. To release the braking, the excitation coil 6 is deenergized, the magnetic flux Φ disappears, the magnetized magnetic particles 4 return to their original state, the braking state between the ring drive 1 and the driven 3 is released, and the ring drive 1 is released. Rotate again in the original state.

By the way, Ring Drive 1 and Driven 3 are
There is a concern that a large amount of frictional heat is generated due to frictional contact with the magnetic particles 4, and the ring drive 1 and the driven 3 are extremely heated and generate heat, and that the magnetic particles 4 are oxidized and sintered and no longer function as a binding medium. be. That is, there is a possibility that the electromagnetic coupling function may be impaired. Therefore, the heat dissipation fin 12 attached to the plate 11 absorbs the frictional heat generated at the connecting part of the ring drive 1 and the driven drive 3.
heat is radiated into the air. However, heat dissipation by the heat dissipation fins 12 alone cannot effectively dissipate the frictional heat generated at the connecting portion of the ring drive 1 and the driven 3, and cannot prevent oxidation and sintering of the magnetic particles 4.

For example, as an improved version of this,
There is one disclosed in Japanese Patent No. 27808, and its outline is shown in FIG. In FIG. 4, reference numerals 13 and 14 are cooling water supply ports and drainage ports formed in the driven 3. 15 is an annular waterway formed in the driven 3 so as to communicate with the water supply port 13 and the drain port 14.
Cooling water enters through the water supply port 13, flows through the water channel 15, and is drained after cooling through the drain port 14, so that the heat generated in the connecting portion is released to the outside.

[Problem that the invention seeks to solve]

However, in the conventional device described above, since the water channel 15 provided in the driven 3 is located away from the part where frictional heat is generated, the efficiency of discharging the heat generated by friction to the outside is poor. If it approaches the outer periphery of the driven 3, the magnetic path shown by the dotted line becomes narrower, making it difficult for the magnetic flux to pass through, and the transmitted torque becomes smaller. In addition, since there is a saturation phenomenon specific to magnetic circuits, even if the excitation force is increased somewhat, the torque will not increase, and the excitation current vs. torque characteristic will not be linear, resulting in poor control characteristics. . As a result, waterway 15 is driven by 3
The ring drive 1 and the driven ring 3 cannot be brought close to the outer periphery thereof, and the frictional heat generated at the connecting portion of the ring drive 1 and the driven 3 cannot be effectively radiated. Therefore, there is a problem in that the exciting coil 6 and the bearing 9 are overheated via the stator 7 and the mounting member 8 due to the frictional heat. Further, in order to cause the cooling water to flow through the driven 3, maintenance such as installation of cooling water supply and drainage equipment outside the device and maintenance of cooling water channels is required.

This invention was made to solve the above-mentioned problems, and aims to provide a maintenance-free and highly reliable device that has sufficient cooling effect without the need for water supply and drainage equipment. .

[Means for solving problems]

The coupling device according to the present invention has a plurality of holes formed in the circumferential direction in an annular first coupling body attached to a rotating shaft, a heat receiving part of a heat pipe is inserted into each hole, and a heat receiving part of a heat pipe is inserted into each hole. Place each heat dissipation section first.
A cooling fin is attached to the heat dissipation part of the heat pipe, and at least one of the axially opposite sides of the cooling fin is made of a material harder than the material of the cooling fin. A plurality of supporting members are arranged on the cooling fin, and the supporting members are fixed to the first connecting body and the annular plate to support the centrifugal force acting on the heat dissipation part of the heat pipe. This is what I did.

[Effect]

The coupling device according to the present invention absorbs frictional heat generated at the coupling part by the heat receiving part of the heat pipe inserted into the hole of the first coupling body, transports it to the heat radiating part of the heat pipe, and cools it by the cooling fin. It radiates heat to the outside and supports the centrifugal force acting on the heat pipe by the annular plate and support member.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In each of these figures, 16 is a ring drive in which a plurality of holes 16a are formed in the circumferential direction, 17 is a heat receiving part 17a inserted into each hole 16a of the ring drive 1, and a heat radiating part 17b is an end of the ring drive 1. space i.e. ring drive 1
A heat pipe 18 is attached to the heat dissipation part 17b of the heat pipe 17, and the heat pipe 18 extends into the left end space of the heat pipe 17 and is filled with a predetermined amount of an evaporative working liquid such as fluorocarbon, ammonia, or water. One example is a plurality of annular cooling fins made of, for example, aluminum that integrally support the heat dissipation portion 17b of each heat pipe 17. Reference numeral 19 denotes an annular plate disposed on at least one of both sides of the annular cooling fin 18 in the axial direction. The cooling fins 18 are made of a harder material than the material of the cooling fins 18, for example, iron. Reference numeral 20 denotes a plurality of supporting members disposed on the outer peripheral side of the annular cooling fin 18 and fixed to the ring drive 16 and the annular plate 19 as shown by welded parts 21, and the centrifugal force acting on the heat dissipation part 17b of the heat pipe 17. support.

Next, the operation will be explained. Now, when the rotating shaft 2 is rotating, the ring drive 16 is also rotating. When the excitation coil 6 of the excitation device 5 is energized in this state, a strong magnetic flux Φ with the stator 7, ring drive 16, and driven 3 as a circuit is generated, and the annular air gap between the ring drive 16 and the driven 3 is generated. The filled magnetic particles 4 are magnetized, bundled, and solidified. At this time, the torque of the ring drive 16 is transmitted to the driven 3 due to the direct coupling force between the magnetic particles 4 and the frictional force between the magnetic particles 4 and the ring drive 16 or the contact surface between the magnetic particles 4 and the driven 3. Braking force is applied. Therefore, the ring drive 16 and the driven 3 are coupled by the magnetized magnetic particles 4, and the ring drive 16 rotates while being braked or stops rotating. In other words, the brakes are applied. To release the braking, the excitation coil 6 is deenergized to eliminate the magnetic flux φ and the magnetized magnetic particles 4 return to their original state, and the braking state between the ring drive 16 and the driven 3 is released and the ring drive 16 is released. Rotate again in the original state.

By the way, due to a large amount of frictional heat generated at the connection portion between the ring drive 16 and the driven 3, the ring drive 16, the driven 3, and the magnetic particles 4 are heated to a high temperature. Ring drive 16 becomes hot
The heat is transferred from the heat pipe 17 inserted into each hole 16a.
is absorbed by the heat receiving part 17a. heat pipe 17
Due to the heat absorbed by the heat receiving section 17a of the heat pipe 17, the working fluid such as fluorocarbon sealed therein is heated, absorbs the heat as latent heat of vaporization, becomes vapor, and flows into the heat dissipating section 17b of the heat pipe 17. Move with. The vapor of the working liquid that has moved toward the heat radiating section 17b of the heat pipe 17 is cooled by the surrounding air with the cooling effect enhanced by the annular cooling fins 18 by cooling air from a cooling fan (not shown) or the like. At this time, the vapor of the working liquid such as fluorocarbon is condensed and liquefied, but the latent heat of condensation is radiated to the surrounding air. The condensed and liquefied working liquid moves inside to the heat receiving section 17a of the heat pipe 17 and returns thereto. In this way, by repeating vaporization and liquefaction of the working liquid in the heat pipe 17, the ring drive 1 absorbed by the heat receiving part 17a of the heat pipe 17
6, that is, frictional heat, is transported from the heat receiving part 17a of the heat pipe 17 to the heat radiating part 17b of the heat pipe 17, and is radiated to the surrounding air. Therefore, the heat of the ring drive 16 into which the heat receiving part 17a of the heat pipe 17 is inserted is transferred to the heat receiving part 17a of the heat pipe 17.
The temperature is lowered and cooled, resulting in a low-temperature state. As a result, Ring Drive 16 and Driven 3
The connecting portion can be sufficiently cooled without providing water supply and drainage equipment, the temperature of the connecting portion can be significantly reduced, and oxidation and sintering of the magnetic particles 4 can be prevented. Furthermore, overheating of the excitation coil 6 and bearing 9 can be prevented. In addition, the annular cooling fins 18 attached to the heat dissipating portions 17b of the heat pipes 17 integrally support the heat dissipating portions 17b of each heat pipe 17, providing reinforcement against centrifugal force and increasing the heat dissipation area, thereby improving the cooling effect. You can also plan. Further, cooling by the heat pipe 17 is maintenance-free, and maintenance work such as maintenance of cooling channels in water cooling is unnecessary. Further, the heat dissipating portion 1 of the heat pipe 17 is supported by a support member disposed on the outer circumferential side of the annular cooling fin 18 and fixed to the ring drive 16 and the annular plate 19.
It is possible to support the centrifugal force acting on the heat pipe 7b, and it is possible to prevent the heat dissipation portion 17b of the heat pipe 17 from swinging.

Further, in the above embodiment, a case has been described in which the annular plate 19 is disposed on both sides of the annular cooling fin 18 in the axial direction, but it is not necessarily necessary to provide it on both sides. An annular plate 19 may be provided on the side.

Further, in the above embodiment, a case has been described in which the heat dissipation part 17b of the heat pipe 17 extends into the left end space of the ring drive 16, but the heat pipe 17
The heat dissipating section 17b can also be arranged so as to extend into the right end space of the ring drive 16.
Alternatively, the heat dissipating portion 17b may be arranged to extend into the space at both ends.

Further, in the above embodiment, a case has been described in which the support member 20 is disposed on the outer peripheral side of the cooling fin 18, but the support member 20 is fixed to the ring drive 16 and the annular plate 19 by penetrating through the cooling fin 18 and the annular plate 19. You may also do so. Further, in the above embodiment, the cooling fins 18 are connected to the heat pipes 17
Although the case has been described in which the cooling fin is configured with an annular cooling fin that integrally supports the heat radiation part 17b, it does not necessarily have to be annular and may be divided into a plurality of parts.

By the way, in the above explanation, the case where the first coupling body rotates and the second coupling body is fixed as a magnetic particle type electromagnetic coupling device, that is, the case where it is applied to a brake device, was described. The present invention can also be applied to a clutch device in which the connecting body rotates.

〔Effect of the invention〕

As explained above, in this invention, a plurality of holes are formed in the circumferential direction in the annular first connecting body attached to the rotating shaft, and the heat receiving part of the heat pipe is inserted into each hole, and the heat pipe is The heat dissipation parts extend into the end spaces of the first connecting bodies, cooling fins are attached to the heat dissipation parts of the heat pipes, and at least one of the axially opposite sides of the cooling fins is provided with a material made of the material of the cooling fins. By disposing an annular plate made of a material harder than the cooling fins, disposing a plurality of supporting members on the cooling fin, and fixing the supporting members to the first connecting body and the annular plate, the heat of the first connecting body is reduced. By repeatedly vaporizing and liquefying the working liquid sealed in the heat pipe, the working liquid is transported from the heat receiving part of the heat pipe to the heat radiating part of the heat pipe, and the heat is radiated to the surrounding air. Heat can be quickly removed from the main body of the first connection and efficiently cooled, a maintenance-free and highly reliable device can be obtained, and the centrifugal force acting on the heat dissipation part of the heat pipe can be supported.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view showing a magnetic particle type electromagnetic coupling device according to an embodiment of the present invention, FIG. 2 is a front view showing a heat dissipation section of a heat pipe according to the present invention, and FIGS. 3 and 4 are respectively FIG. 2 is a cross-sectional side view showing a conventional magnetic particle type electromagnetic coupling device. In the figure, 2 is a rotating shaft, 3 is a second connecting body, 4 is a magnetic particle, 5 is an exciting device, 16 is a first connecting body, 16a is a hole, 17 is a heat pipe, 1
7a is a heat receiving part, 17b is a heat radiating part, 18 is an annular cooling fin, 19 is an annular plate, and 20 is a support member. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. An annular first connecting body that is attached to a rotating shaft and has a plurality of holes formed in the circumferential direction, and an annular gap that is concentrically arranged on the inner circumferential side of the first connecting body. a second connecting body disposed across from the first connecting body, magnetic particles filled in an annular gap between the first connecting body and the second connecting body, and magnetizing the magnetic particles to form each of the connecting bodies; A heat receiving part is inserted into each hole of the first connecting body, and a heat dissipating part extends into the end space of the first connecting body, and a heat radiating part extends into the end space of the first connecting body. a heat pipe in which a predetermined amount of a working liquid having a property is sealed; a cooling fin attached to a heat dissipating portion of the heat pipe; an annular plate made of a material harder than the cooling fin, a plurality of support members disposed on the cooling fin, fixed to the first connecting body and the annular plate, and supporting centrifugal force acting on the heat dissipation part of the heat pipe; A magnetic particle type electromagnetic coupling device characterized by comprising: 2. The magnetic particle type electromagnetic coupling device according to claim 1, wherein the cooling fin is an annular cooling fin that integrally supports the heat radiation section of each heat pipe. 3. The support member is arranged on the outer peripheral side of the cooling fin,
The magnetic particle type electromagnetic coupling device according to claim 1 or 2, characterized in that the magnetic particle type electromagnetic coupling device is fixed to the first coupling body and the annular plate.