JPH0583773B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention involves filling a space between a first connecting body and a second connecting body with magnetic particles, magnetizing the magnetic particles, and creating a torque between the two connecting bodies. The present invention relates to an electromagnetic coupling device for transmitting a signal, and particularly to its cooling structure.

[Prior Art] Fig. 4 shows a schematic configuration of a conventional electromagnetic coupling device described, for example, on pages 2-2 to 2-5 of ``Mitsubishi Electromagnetic Clutch and Brake General Catalog, September 1985''. 1 is a cross-sectional view showing an annular ring drive (hereinafter referred to as a first connecting body) which 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 drive (hereinafter referred to as a second
(called the connecting body), and forms the magnetic circuit on the fixed side. 4 is the first connecting entity 1 and the second connecting entity 3
It is a magnetic particle that fills the annular gap between the two, becomes solid by magnetization, and becomes a torque transmission medium between the first connection main body 1 and the second connection main body 3. Reference numeral 5 denotes an excitation device disposed on the outer circumferential side of the first coupling main body 1, which is composed of an excitation coil 6 and a stator 7, and generates magnetic flux φ by energizing the excitation coil 6 to magnetize the magnetic particles 4. torque is transmitted between the first connecting body 1 and the second connecting body 3. Reference numeral 8 denotes a fixing attachment member attached to one side of the stator 7, which is attached to a fixing part (not shown) and supports the rotating shaft 2 via a bearing 9 between it and the rotating shaft 2. Reference numeral 10 designates a bracket that connects and secures the second connecting body 3 to the opposite side of the attachment portion of the fixing attachment member 8 of the stator 7, and has through holes 10a and 10b formed therein. 11 is a plate that closes the opening of the first connecting body 1 and rotates in conjunction with the first connecting body 1; 12 is a heat radiation fin attached to the plate 11;

Next, the operation will be explained. When the excitation coil 6 is energized while the rotating shaft 2 is rotating together with the first connecting body 1, a magnetic circuit shown by a broken line passing through the stator 7, the first connecting body 1, and the second connecting body 3 is formed. A magnetic flux φ is generated, and the magnetic particles 4 filled in the annular gap between the first connecting body 1 and the second connecting body 3 are magnetized and become solid. At this time, between the magnetic particles 4 and the first connecting body 1,
Alternatively, due to the frictional force acting on the contact surface between the magnetic particles 4 and the second connecting body 3, torque is applied to the first connecting body 1.
The braking force is transmitted to the second connecting body 3, and a braking force is applied to the first connecting body 1. The braking torque generated in the second connecting body 3 is transmitted via the bracket 10 and the stator 7 to a fixing mounting member 8 attached to an external fixed part. The braking torque transmitted from the second connecting body 3 in this manner is transmitted to the fixed part. Therefore, the first connecting body 1 and the second connecting body 3 are coupled by the magnetized magnetic particles 4, and the first connecting body 1 rotates while being braked.
It even stops. In other words, the brakes are applied. To release the brake, the excitation coil 6 may be deenergized. By deenergizing the excitation coil 6, the magnetic flux φ
disappears, the bond between the magnetic particles 4 is released, and the braking state between the first connecting body 1 and the second connecting body 3 is released.

By the way, since the first connecting body 1 and the second connecting body 3 come into frictional contact with the magnetic particles 4, kinetic energy is converted into thermal energy at this contact portion, and the temperature rises. When the magnetic particles 4 exceed a permissible temperature, they are oxidized and sintered and lose their function as a torque transmission medium. This limits the temperature rise and limits the torque transmission ability. Therefore, the frictional heat generated at the connecting portion of the first connecting body 1 and the second connecting body 3 is dissipated into the air by heat radiation fins 12 attached to the plate 11. However, heat dissipation by the heat dissipation fins 12 alone cannot sufficiently dissipate the frictional heat generated at the connection between the first connection body 1 and the second connection body 3, and it is difficult to increase the torque transmission capacity. I can't.

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. 5, reference numerals 13 and 14 are a cooling water inlet and a water outlet formed in the second connecting body 3. 15 is the water supply port 13 and the drain port 14
It is a ring-shaped waterway that is connected to the waterway. Cooling water is supplied from the water supply port 13, flows through the water channel 15 to cool the second connecting body 3, and is drained from the drain port 14, so that the heat generated in the connecting portion is released to the outside.

[Problems to be Solved by the Invention] However, in the conventional device described above, since the water channel 15 provided in the second connecting body 3 is located away from the part where frictional heat is generated, it is difficult to release the heat generated by friction to the outside. The ability to do so is small. If, in order to avoid this drawback, the water channel 15 is brought closer to the outer periphery of the second connecting body 3 where frictional heat is generated, the cross section of the magnetic path shown by the broken line will become smaller, making it difficult for the magnetic flux to pass through, and the transmitted torque will be reduced. becomes smaller. Further, since there is a saturation phenomenon peculiar to the magnetic circuit, even if the excitation current is increased, the torque does not increase, and the linearity of the transmission characteristics with respect to the excitation current cannot be obtained, resulting in poor control characteristics. For this reason, the water channel 15 cannot be provided close to the outer periphery of the second connecting body 3, that is, close to the area where frictional heat is generated. Therefore, it is not possible to effectively dissipate the frictional heat generated at the connecting portion between the first connecting body 1 and the second connecting body 3. Furthermore, the first connecting entity 1, the second connecting entity 3,
There is a problem in that the excitation coil 6 and the bearing 9 are heated via the stator 7 and the mounting member 8 due to radiant heat due to frictional heat generated by the magnetic particles 4 and heat conduction. In addition, it is necessary to install water supply and drainage equipment outside the device in order to circulate cooling water to the second connecting body 3,
Furthermore, there are other problems such as the need for maintenance such as maintenance of cooling channels. In addition, the bracket 10 needs to have sufficient strength to support the second connecting body 3, and also to maintain an annular gap between the first connecting body 1 and the second connecting body 3. It is necessary to precisely process the joint between the bracket 10 and the second connecting body 3.

This invention was made to solve the above-mentioned problems, and it does not require installation of water supply and drainage equipment, provides a sufficient cooling effect, has a large transmission torque capacity, and has high reliability without the need for maintenance. The purpose is to obtain a device with high performance.

[Means for Solving the Problems] A magnetic particle type electromagnetic coupling device according to the present invention includes an excitation device in which an excitation coil is mounted in a stator, a flange attached to one side of the excitation device and having an opening in the center, A rotating shaft whose one end extends through the opening of the flange to the excitation device side and whose other end extends outside the flange and is supported via a bearing, and which is attached to one end of this rotating shaft and whose outer peripheral side is the excitation device. a first disc extending near the inner periphery on the opposite side of the flange; an annular plate connected to the first disc and having a plurality of holes concentrically and circumferentially formed on the inner periphery of the excitation device; A first connecting body is arranged on the inner peripheral side of the first connecting body on a concentric axis with an annular gap spaced apart, and the inner peripheral side is fitted onto the rotating shaft with a distance therebetween and is attached to the fixing mounting member. the second connected entity, the first connected entity and the second connected entity
magnetic particles that are filled in an annular gap between the connecting bodies and are magnetized by an excitation device to transmit torque between each connecting body; A second circular plate with a second connecting body interposed between it and the plate, a heat receiving part inserted into each hole of the first connecting body, and a heat radiating part extending into an end space of the first connecting body, Heat pipes with a predetermined amount of evaporative working liquid sealed inside, annular cooling fins that are attached to the heat dissipation parts of these heat pipes and integrally support the heat dissipation parts of each heat pipe, and installed on the side opposite to the flange of the excitation device. A cover body that covers the heat dissipation part of the heat pipe and forms a cooling air passage from the inner circumference side of the annular cooling fin to the outer circumference side of the annular cooling fin through the heat dissipation part of the heat pipe is provided. The heat is caused to flow from the circumferential side to the outer circumferential side of the annular cooling fin via the heat dissipation part of the heat pipe.

[Function] The coupling device of 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, and cools it with cooling air. Dissipates heat to the outside.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3.
This will be explained based on the diagram. In each of these figures, 1
6 is a flange that is attached to one side of the excitation device 5 and has an opening in the center and is supported by a fixed part (not shown); 17 is a flange whose one end side 17a passes through the opening of the flange 16 and extends toward the excitation device 5 side; A rotary shaft 19 is supported via a bearing 18, and 19 is a rotary shaft 17
An inner peripheral side 19a is attached to one end side 17a by, for example, welding, and an outer peripheral side 19b extends near the inner peripheral part on the opposite side to the side where the flange 16 of the excitation device 5 is attached.
A disk 20 is an annular first connecting body that is attached to the outer circumferential side 19b of the first disk 19 and has a plurality of holes 20a formed on the inner circumferential side of the excitation device 5 on a concentric axis and in the circumferential direction. , 21 are disposed on the inner circumferential side of the first connecting body 20 on a concentric axis with an annular gap spaced apart, and the inner circumferential side is fitted into the rotating shaft 17 at a distance and is attached to the flange 16. Connecting entity of 2, 2
2 is a magnetic particle that is filled in the annular gap between the first connecting body 20 and the second connecting body 21 and is magnetized by the excitation device 5 to transmit torque between each connecting body; First disc 1 of connecting body 20
A second disc 24 is attached to the side opposite to the side to which 9 is attached by, for example, a bolt (not shown) and has a second connecting body 21 interposed between it and the first disc 19; A seal disposed between the flange 16, 25 a heat dissipation fin attached to the second disc 23, and 26 each hole 20a of the first connecting body 20.
A heat pipe 27 in which a heat receiving part 26a is inserted, a heat radiating part 26b extends into the end space of the first connecting body 20, and a predetermined amount of evaporative working liquid such as fluorocarbon, ammonia, water, etc. is sealed inside. is the heat radiation part 26
An annular cooling fin 28 is attached to the excitation device 5 on the side opposite to the flange 16, and has a first opening 28a in the center.
A cover body 29 having a second opening 28b near the excitation device 5 side and covering the heat radiation part 26b is attached to the first opening 28a and directs the cooling air to the first opening 2.
This is a cooling fan that supplies heat from the heat sink 8a, cools the heat radiation section 26b, and discharges the heat to the outside from the second opening 28b.

Next, the operation will be explained. The mechanism by which torque is transmitted from the first connecting body 20 to the second connecting body 21 and the mechanism by which frictional heat is generated are the same as in the conventional example, and their explanation will be omitted.

Frictional heat due to torque transmission causes the first connecting body 2 to
0, when a temperature rise occurs in the second connecting body 21 and the magnetic particles 22, each hole 20 of the first connecting body 20
The working fluid in the heat radiating part 26a inserted in the heat radiating part 26a evaporates, and frictional heat is absorbed as latent heat of evaporation. The vapor of the working liquid moves to the heat radiation part 26b, and is cooled and condensed by the cooling air flowing in from the supply port 28a due to the fan effect caused by the rotation of the cooling fan 29 or the annular cooling fin 27. The cooling air is heated by the latent heat of condensation and is discharged from the discharge port 28b.

Since the heat receiving portion 26a is inserted in the vicinity of the portion where frictional heat is generated, the first connecting body 20, the second connecting body 21, and the magnetic particles 22 are effectively cooled. Since the heat pipe 26 has an extremely large heat transport capacity, the temperature gradient inside the first connecting body 20, the second connecting body 21, and the magnetic particles 22 is small, and the temperature distribution is made uniform. Annular cooling fin 27
are attached to the heat dissipation part 26b and are integrally supported, so they have a great reinforcing effect against centrifugal force, and furthermore, their number can be increased or decreased as appropriate to provide a large cooling capacity. As a result, when transmitting the same amount of torque as the conventional electromagnetic particle type coupling device, the temperature rise in the coupling portion can be significantly reduced. This means that the electromagnetic particle type coupling device of the present invention can transmit a large torque even though it has the same size as the conventional one.

Furthermore, since the first connecting body 20 faces the excitation coil 6, the temperature increase in the first connecting body 20 can be reduced by eliminating the temperature rise in the exciting coil 6 due to radiant heat from the first connecting body 20. In addition, there is also the effect that the excitation coil can also be cooled, making it possible to use an inexpensive excitation coil with low heat resistance. Furthermore, reducing the temperature rise of the first connection body 20 also has the effect of suppressing the temperature rise due to heat transfer in the bearing 18 fitted to the rotating shaft connected to the first connection body 20.

Furthermore, cooling by the heat pipe 26 does not require maintenance, and does not require maintenance of cooling channels in water cooling.

Furthermore, the bracket in the conventional example is
Precise machining is essential to support the connecting body and maintain an annular gap between the first connecting body and the second connecting body, but according to the present invention, a cover that simply covers the heat dissipating part 26b is required. It has the advantage that it can be produced at low cost because it only requires the use of the body.

Incidentally, in the above embodiment, a case has been described in which the heat radiation part 26b is provided in the space between the first connection main body 20 and the cover body 28, but the heat radiation part 26b is provided in the space between the first connection main body 20 and the flange 16. May be placed.

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

[Effects of the Invention] As explained above, the present invention includes an excitation device having an excitation coil installed in a stator, a flange attached to one side of the excitation device and having an opening in the center, and one end passing through the opening of the flange. A rotating shaft that extends toward the excitation device side, the other end of which extends outside the flange, and is supported via a bearing, and a rotating shaft that is attached to one end of the rotating shaft and whose outer circumferential side is the inner circumference opposite to the excitation device flange. a first circular plate extending near the area; an annular first connecting body connected to the first circular plate and having a plurality of holes concentrically and circumferentially formed on the inner circumferential side of the excitation device; , a second connecting body disposed on the inner circumferential side of the first connecting body on a concentric axis with an annular gap spaced therebetween, the inner circumferential side of the second connecting body being fitted into the rotating shaft with a distance therebetween and attached to the flange; magnetic particles filled in an annular gap between the first connecting body and the second connecting body and magnetized by the excitation device to transmit torque between each connecting body; A second disc is attached to the opposite side and has a second connecting body interposed between it and the first disc, a heat receiving part is inserted into each hole of the first connecting body, and a heat dissipating part is inserted into each hole of the first connecting body. A heat pipe that extends into the end space and has a predetermined amount of evaporative working liquid sealed inside, an annular cooling fin that is attached to the heat dissipation section of these heat pipes and integrally supports the heat dissipation section of each heat pipe, and an excitation device. The cover body is attached to the side opposite to the flange attachment side, covers the heat radiation part of the heat pipe, and configures a cooling air path from the inner circumference side of the annular cooling fin to the outer circumference side of the annular cooling fin via the heat dissipation part of the heat pipe. Therefore, the magnetic particle type electromagnetic coupling device according to the present invention has the following features: (a) Due to the viscosity of the air between the cooling fins, the annular cooling fins rotate as the annular cooling fins rotate, generating centrifugal force and causing air to flow in the radial direction. This results in effective heat dissipation from the heat pipe heat dissipation section.

(b) The heat dissipation part of the heat pipe is integrally supported by the annular cooling fin, so it can withstand high-speed rotation without being deformed by the centrifugal force that accompanies rotation.

(c) Since the heat of the first connecting body interposed between the excitation device and the second connecting body is transferred from the heat receiving part of the heat pipe to the heat radiating part, the heat is effectively radiated.
Not only the heat generated by the magnetic particles but also the heat generated by the excitation device and the second connecting body can be efficiently radiated and cooled.

(d) Since the immediate vicinity of the magnetic particles is cooled, seizure of the magnetic particles can be prevented.

(e) Since the heat generated in the excitation device can also be cooled, an excitation coil with low heat resistance can be used and the device can be made inexpensive.

(f) Since the temperature rise in the first connection body is smaller than the temperature rise in the second connection body, the annular gap will not expand due to the temperature rise of the device, and the transmitted torque will not decrease due to the temperature rise. do not have.

(g) It is not necessary to provide water supply and drainage equipment for cooling the first connecting body, and high reliability can be obtained without maintenance.

(h) Since the rotating shaft passing through the opening of the flange is connected to the first disk on the opposite side of the flange of the exciting device, the distance between the bearings that support it is large, and the rotating part is stabilized.

(i) Since the excitation device and the second connecting body are attached to the flange, the main structure of the stationary part can be composed of a small number of parts, and it is easy to maintain accuracy.

(j) The cover body that covers the heat dissipation part of the heat pipe is for adjusting the air flow and is not the main structure that realizes the connection function, so it has a simple structure and can be manufactured at low cost.

Many other effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a magnetic particle type electromagnetic coupling device according to an embodiment of the present invention, FIG. 2 is a front view showing a first coupling body according to the present invention, and FIG. 3 is a heat pipe according to the present invention. 4 and 5 are cross-sectional views of a conventional magnetic particle type electromagnetic coupling device, respectively. In the figure, 5 is an excitation device, 16 is a flange,
17 is a rotating shaft, 19 is a first disk, 20 is a first connecting body, 21 is a second connecting body, 22 is a magnetic particle, 23 is a second disk, 26 is a heat pipe, 27
28 is an annular cooling fin, 28 is a cover body, and 19 is a cooling fan. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. An excitation device having an excitation coil installed in a stator, a flange attached to one side of the excitation device and having an opening in the center, and one end passing through the opening of the flange to excite the excitation device. a rotating shaft that extends toward the device and has its other end extending outside the flange and is supported via a bearing; a rotating shaft that is attached to one end of the rotating shaft and whose outer circumferential side is inside the excitation device on the side opposite to where the flange is attached; a first circular plate extending near the circumferential portion; an annular first plate connected to the first circular plate and having a plurality of holes concentrically and circumferentially formed on the inner circumferential side of the excitation device; a second connecting body, which is disposed on the inner peripheral side of the first connecting main body on a concentric axis with an annular gap spaced therebetween, and whose inner peripheral side is fitted into the rotating shaft with a distance therebetween and is attached to the flange; a connecting body; magnetic particles filled in an annular gap between the first connecting body and the second connecting body and magnetized by the excitation device to transmit torque between the respective connecting bodies; the first connecting body; a second disc attached to the opposite side of the main body from the first disc and with the second connecting body interposed between it and the first disc; a heat receiving part in each hole of the first connecting body; A heat pipe that is inserted and has a heat dissipation part extending into the end space of the first connection main body, and a predetermined amount of evaporative working liquid is sealed inside; an annular cooling fin integrally supporting a heat dissipation section; attached to the opposite side of the flange of the excitation device to cover the heat dissipation section of the heat pipe; A magnetic particle type electromagnetic coupling device characterized by comprising a cover body forming a cooling air passage leading to the outer circumferential side of a cooling fin.