JPS6322338Y2 - - 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 the magnetic particles. It is related to.

This type of coupling device has many advantages over friction type coupling devices, among them being that torque can be controlled by changing the excitation current.
It has the outstanding advantage of being able to be used with continuous slipping within the range permitted by heat capacity. However, if natural cooling is used, the range of heat capacity that can be used by continuous slipping is limited, so many cooling methods using cooling media such as water have been proposed.

A conventional water-cooled device is shown in FIG. 1 and will be described below. In the device shown in FIG. 1, one of the pair of connecting bodies is fixed to serve as a brake. In FIG. 1, 1 is a stator, 2 is an annular excitation coil built into the stator 1, 3 is a bracket fixed to the stator 1 with bolts (not shown) and supports the stator 1, and bearings 4 , 5, and rotatably supports a rotating shaft 6. 7 is a retaining ring that prevents the axial movement of the bearings 4 and 5; 8 is a space collar; 9 is fixed to the rotating shaft 6 by welding;
10 is a plate fixed to this drive member 9 with a bolt (not shown); This bracket is fixed to the stator 1 with bolts (not shown) and connects the stator 1 and a driven member 12, which will be described later. Reference numeral 12 denotes a driven member that is fixed to the bracket 11 with a bolt (not shown) and constitutes a first connecting body provided inside the drive member 9 with a predetermined radial annular gap therebetween; , 12b are a water supply channel and a drainage channel provided in the driven member 12, through which cooling water 14 (described later) flows, and 12c is an annular cooling channel communicating with the water supply channel 12a and the drainage channel 12b. Reference numeral 13 indicates magnetic particles filled in a cylindrical gap where the drive member 9 and the driven member 12 face each other, and 14 indicates cooling water that is forced to flow through the cooling passage 12c.

Next, the operation of the above conventional device will be explained. A rotating shaft 6 coupled to a drive source (not shown) is rotated,
When the drive member 9 is rotating together with the rotating shaft 6, if the excitation coil 2 built in the stator 1 is excited by a power supply device (not shown), the stator 1 and the drive are rotated as shown by the dotted line in the figure. A magnetic flux Φ is generated in the member 9 and the driven member 12, and the magnetic particles 13 that are part of this magnetic path solidify between the rotating drive member 9 and the stationary driven member 12, forming a chain. The drive member 9 is stopped together with the rotating shaft 6 or rotates while being braked. Frictional heat is generated by the slip at this time, and the drive member 9, magnetic particles 13, and driven member 12 are extremely heated by this frictional heat. The stator 1, which is disposed through it, is also heated up considerably. If these temperatures become excessive, problems such as burnout of the excitation coil 2 built into the stator 1 will occur.

In order to absorb this frictional heat, cooling water 14, which is a cooling medium, is introduced from the water supply channel 12a, flows through the cooling channel 12c, and is discharged from the drain channel 12b. In this way, the driven member 12 is cooled by the cooling water 14, and thereby the magnetic particles 13 and the drive member 9
Since these parts are also cooled, the temperature in their vicinity is lowered.

However, in the conventional device described above,
The cooling passage is provided inside the driven member 12, which is radially inward with respect to the inner circumferential surface of the drive member 9 and the outer circumferential surface of the driven member 12 (hereinafter these surfaces are referred to as operating surfaces) where frictional heat is generated. As a result, the drive member 9 located radially outward with respect to the operating plane cannot be fully formed, and therefore the stator 1
However, sufficient cooling cannot be achieved only by natural heat dissipation. Therefore, in order to prevent burnout of the excitation coil,
The drawback was that the functions of this device could not be fully utilized. In addition, in the conventional device, stator 1
In order to actively cool down the air, there are methods such as compressed air or air blowing by a blower, but in this case, such equipment is required, and its maintenance and management are also required. There are also drawbacks.

This idea was made to eliminate the drawbacks of the conventional device as described above, and by installing the evaporating part of the heat pipe in the stator and the condensing part in the cooling channel, it is possible to sufficiently cool the stator 1 as well. The present invention provides a magnetic particle type electromagnetic coupling device with a good cooling effect.

An embodiment of this invention shown in FIG. 2 will be described below. In Figure 2, 1 to 16 are the first
17 is a tank connected to the pipe 16 and provided outside the device, 18 is a drainage channel, and 19 is a heat pipe, the evaporation part 19a of which is buried near the gap g of the stator 1. and condensing section 1
9b is installed inside the tank 17. However, it is assumed that the stator 1 has a magnetic path necessary for the magnetic flux Φ to flow therethrough. In addition, cooling water 1
The distribution route No. 4 includes the water supply pipe 15, the water supply channel 12b, the cooling passage 12c, the drainage channel 12a, the pipe 16, and the tank 1.
7, becomes the drain pipe 18.

Next, the operation will be explained, but since the operation of the device is similar to the conventional device described above, the explanation will be omitted, and the cooling effect will be described.

A part of the frictional heat generated on the operating surface is absorbed by the cooling water flowing through the cooling passage in the driven member 12, and the rest is radiated from the drive member 9 to the atmosphere or to the stator 1. The heat is radiated from the evaporating part 19a of the heat pipe 19 to the cooling water in the tank 17 via the condensing part 19b installed in the tank 17. At this time, since the condensing part 19b is installed in the drainage route,
Absorption of frictional heat from the cooling passage 12c is not affected. Also, while the temperature of the waste water is usually around 30℃, the temperature near the gap g of the stator 1 is
Since the temperature is about 100° C., a sufficient cooling effect can be obtained by the heat pipe 19. In this way, the temperature of the stator 1 can be lowered compared to the conventional device, so overheating of the excitation coil can be prevented, and the driven member 12 can be cooled, and the heat capacity range that can be used in continuous slips can be increased. I can do it.

In addition, in the above-mentioned embodiment, the brake device was explained as a magnetic particle type electromagnetic coupling device.
The same applies to a clutch device as another application example. In this case, the driven member 12 is supported by a bearing or the like to be rotatable, and a sealing mechanism for supplying cooling water is added thereto.

Further, in the above embodiment, the direction of flow of the cooling water may be reversed, and the cooling passage 12c does not have to be annular.

As described above, according to this invention, the evaporating part of the heat pipe is installed in the stator, and the condensing part is installed in the cooling water distribution path located outside the device, so there is no need to add equipment such as a blower, and it is possible to This has the effect of making it possible to obtain a device with a much superior cooling effect compared to other devices.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional device, and FIG. 2 is a sectional view showing an embodiment of this invention. In the figure, 1 is a stator, 2 is an excitation coil, 3 is a bracket, 6 is a rotating shaft, 9 is a drive member, 1
2 is a driven member, 12a is a water supply channel, 12b is a drainage channel, 12c is a cooling passage, 13 is a magnetic particle, 1
4 is cooling water, 15 is a water supply pipe, 16 is a drain pipe, 17
is a tank, 18 is a drain pipe, 19 is a heat pipe,
19a is an evaporation section, and 19b is a condensation section. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] a first connecting body; a second connecting body disposed opposite to the first connecting body with a predetermined gap; magnetic particles filled in the gap; an excitation device that causes a magnetic flux to flow between the connection bodies and magnetizes the magnetic particles to generate a connection torque between the connection bodies, a stator housing the excitation device, and the first or second connection body; A magnetic device having a cooling medium flow path inside the stator, wherein the evaporating part of the heat pipe is embedded in the stator, and the condensing part is disposed in the cooling medium flow path outside the device. Particle type electromagnetic coupling device.