JPS6388335A - Magnetic particle type electromagnetic connector - Google Patents

Abstract

PURPOSE:To try so as to have sufficient strength obtained by providing a plurality of heat pipes near the connection surface of a rotor which is the 2nd connecting main-body on the outer perimeter side and supporting the heat- dissipation portions of their sealed tubes with a plurality of annular cooling fins. CONSTITUTION:When a magnetization coil 2 is magnetized, magnetic particles 10 are magnetized and bound and solidified, and a drive rotor 8 and a driven rotor 9 are connected, and the drive rotational force of a drive rotational shaft 4 is transmitted to a driven rotational shaft 5. At this time, frictional heat occurring at a connection portion due to a slip is absorbed at the heat-suction portions of a plurality of heat pipes 34 combined as one body near the connction surface of the drive rotor 8 and is heat-transported to heat-dissipation portions by oprating-liquid 32 inside selected tubes 31 and is dissipated to the outside through a plurality of annular cooling fins 33. The heat dissipation portions of these sealed tubes 31 are respectively supported by penetrating a plurality of annular cooling fins 33 and are connected and fixed to one another. Thus, sufficient cooling effect is obtained without using a cooling medium from the outside, and high mechanical strength is realized and reliability improves.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an electromagnetic clutch connected via magnetic particles, and particularly provides an excellent electromagnetic coupling device that can be cooled by a heat pipe to increase heat capacity. It is something.

[Prior Art] FIG. 3 is a sectional view showing a conventional magnetic particle type electromagnetic coupling device disclosed in, for example, Japanese Utility Model Publication No. 51-49478.
In the figure, (1) is the stator, (2) is the excitation coil built into the stator (1), (3) is a pair of bearings, (4)
) is a drive rotating shaft supported on the stator (1) via a pair of bearings (3), (5) is a pair of bearings (3)
A driven rotating shaft (6) supported on the stator (1) via
) is a cylindrical spacer, (7) is a bearing holder, (8) is a drive rotor integrated with the drive rotation shaft (41), (9
) is a driven rotor that is arranged on a concentric axis with the driving rotor (8) with a gap between it and connected to the driven rotating shaft (5) - 〇〇 is the driving rotor (8) and the driven rotor (9) Magnetic particles filled in the gap between
Bolts that screw υ to the drive rotor (8), a3 are the annular non-magnetic sleeves attached to the driven rotor (9) and plate αD, A casing to which the drive rotation shaft (4) is attached and through which the drive rotation shaft (4) passes, the opening S is a cooling medium inlet provided in the casing α4, (16)
is the discharge port provided in the casing circle, and U is the inlet port a9
aa is an introduction passage provided in the drive rotation shaft (4) through which the cooling medium (1η passes); Q91 is a ring-shaped introduction passage provided in the drive rotor (8) and communicating with the introduction passage (181); Passage - ■ is a discharge passage provided on the drive rotating shaft (4) that guides the cooling medium αη that has gone around the annular passage device to the discharge port αQ, and the slope is a cylindrical spacer made of stainless steel or the like.
(2) is an 0 ring that prevents the cooling medium 0η from leaking when the cooling medium αη is introduced from the inlet α9 to the inlet passage α, and when the coolant αη is discharged from the discharge passage (2) to the discharge port OQ;
The container is a plurality of sealing materials provided between the casing α and the cylindrical spacer f211, and is configured as, for example, an oil seal, and seals and divides the space between the inlet aω and the outlet αe, It also prevents the cooling medium from the inlet (1) and the outlet (1e) from flowing out from between the casing αΦ and the drive rotation shaft (4).

The above-mentioned cylindrical spacer is fixed to the shaft (4) by an integrated O-ring, or if necessary, it can be fixed to the shaft (4) by screws or the like.

To explain the operating state of the clutch, the drive rotation shaft (
4) is driven by a prime mover (not shown) and has a driven rotating shaft (
5) is connected to a load (not shown).

Now, when the drive rotor (8) is rotating, the excitation coil (
When 2) is excited, a magnetic flux Φ is generated in the magnetic path shown by the broken line, and the magnetic particles 0α are magnetized and solidified, connecting the driving rotor (8) and the driven rotor (9), so that the driven rotating shaft Torque is transmitted to (5).

The load side mechanism or, depending on the operating condition, the drive rotor (
8) and the driven rotor (9) slip transiently or continuously, and at that time, a large amount of frictional heat is generated on the surface that contacts the magnetic particles αα, causing the drive rotor (8) and the driven rotor to slip. There is a concern that the magnetic particles (9) will be heated so much that the monomagnetic particles Oa will be oxidized and sintered and will no longer function as a binding medium.

However, since the cooling medium αη, for example, water or oil, is supplied from the inlet 05, passes through the inlet passage, flows fully into the annular passage 09, passes through the discharge passage (■), and is sent to the outlet Oe, it is heated. The driving rotor (8) is directly cooled, and at the same time, the magnetic particles OG and the driven rotor (9) are indirectly cooled.

[Problems to be solved by the invention] Since the conventional electromagnetic coupling device is configured as described above, it is necessary to introduce a cooling medium from the outside, and a complicated passage for the cooling medium and a supply device for this are required. This resulted in high costs and required considerable maintenance to prevent leakage of the cooling medium.

In addition, as a conventional device using heat pipes,
No. 510 is known, but it is installed at a location away from the heat generating part, and the cooling effect cannot be expected in most cases.

In addition, conventional cooling using heat pipes consists of a pair of heat pipes and fins, and if multiple heat pipes are used as rotating bodies, the strength is insufficient due to centrifugal force.

This invention was made to solve the above problems, and it is possible to obtain sufficient strength, reduce manufacturing costs, and provide sufficient cooling, maintenance-free, and highly reliable electromagnetic technology. The purpose is to obtain a coupling device.

[Means for solving problems]

The electromagnetic coupling device according to the present invention has a second
A heat pipe consisting of a plurality of sealed tubes containing working fluid inside and cooling fins formed on the protrusion of the sealed tube is provided near the connection surface of the rotor, which is the main connection body, and the cooling fin is annular and has a plurality of heat pipes. It is designed to support a sealed tube.

[Effect]

In the electromagnetic coupling device according to the present invention, the heat pipe cools one rotor heated by frictional heat and indirectly cools the magnetic particles and the other rotor, and the cooling fins are annular. This supports multiple sealed tubes and increases mechanical strength.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

In the figure, (1) is a stator, (2) is an excitation coil built into stator (1), (3) is a pair of bearings, (
4) is a drive rotating shaft supported by the stator (1) via a pair of bearings (3), and (5) is a drive rotation shaft supported by a pair of bearings (3).
) is supported on the stator (1) via a driven rotating shaft (
6) is a cylindrical spacer, (7) is a bearing holder, (8)
is a drive rotor that is formed integrally with the drive rotation shaft (4) and forms a second connection main body, and (9) is arranged on a coaxial axis with a gap between the drive rotor (8) and the first The driven rotor forms the main body of the connection and is attached to the driven rotating shaft (5). αC is the driving rotor (8) and the driven rotor (9)
magnetic particles filled in the gap with (Ill is the plate,
αJ is an annular non-magnetic case attached to the driven rotor (9) and plate aD, and ■ is fixed to the end of the stator (1) via bolts (not shown). bracket,
(30a) is a ventilation window provided in the bracket (2); T31) is a plurality of hollow cylindrical sealed tubes connected to the drive rotor (8) and protruding in the axial direction;
(branch) is a working fluid with evaporative properties, such as water, alcohol, ammonia, etc., which is sealed under reduced pressure inside a plurality of sealed tubes 6υ; , sealed tube r31J, and working fluid @ form a heat pipe □. Further, as shown in FIG. 2, the cooling fin (2) is formed in an annular shape so as to integrally support a plurality of sealed tubes (T31).

With this configuration, magnetic flux is generated by feeding power to the excitation coil (2), which magnetizes and solidifies the magnetic particles aα, and as a result, the driving rotor (8) and the driven rotor ( 9) are dynamically connected, so the drive rotation shaft (
4), power is transmitted to the driven rotating shaft (5). There is no difference in such action from conventional devices. By the way - driving rotor (8) and driven rotor (9)
Drive rotor (8) due to frictional heat generated when the
, the driven rotor (9) and the magnetic particles α■ will be heated, but according to the present invention, a heat pipe (to) is connected to the connection surface of the drive rotor (8). As a result, the heat generated as frictional heat is transferred to this heat pipe (
released into the outside air through the air (goods).

That is, the heat generated in the drive rotor (8) first propagates to the end of the sealed tube connected to the drive rotor (8) on the drive rotor (8) side, and the heat generated in the drive rotor (8) is transmitted to the drive rotor (8) side end of the sealed tube connected to the drive rotor (8). Heat the liquid ■. The working fluid (1) is heated and evaporates, and the vapor rushes through the cavity toward the outer end, which is the non-heated part. At this outer end, the outer periphery of the sealed tube Gll is in contact with the outside air and has a radiation fin field, so the internal steam that reaches this part is cooled and condensed, becoming a liquid. Heat of condensation is dissipated, and this heat of condensation is exchanged with outside air via the sealed tube C31). The heat-exchanged working fluid is then transferred as a liquid to the drive rotor (8), which is a heating section, where it is heated again and evaporated.

By repeating the above cycle (thereby, heat is transported from the inner end of the sealed tube C311 connected to the drive rotor (8), which is a heat generation source, to the outer end exposed to the outside air. In particular, the drive rotor Due to the rotation in (8), the outer end of the heat pipe (to) and the annular cooling fin [with] are rotated relative to the air, so the heat transfer coefficient is high and the cooling effect is further improved. Since the centrifugal car supports a plurality of sealed tubes c31), its strength can be reinforced against pressure from outside the centrifugal car.

In the above embodiments, a clutch device has been described as a magnetic particle type electromagnetic coupling device, but the same applies to a brake device as another application, and in this case, the driven rotor may be fixed. Further, the same effect can be obtained by integrating the excitation coil (2) built into the stator (1) and the drive rotor (8), and providing a heat pipe (to) near the connecting surface as the rotor. In addition, in the above embodiments, the cooling fins of the rotor side heat pipe are provided only at one end of the sealed tube, or if the sealed tube is extended to the other side and similar cooling fins are provided, cooling fins are provided at both ends. The cooling effect will be even higher.

〔Effect of the invention〕

As described above, according to the present invention, the connecting portion can be efficiently cooled by the heat pipe provided integrally with the drive rotor, which is the second connecting main body provided on the outer periphery, and the cooling medium is introduced from the outside. Therefore, there is no need for a complicated path for the cooling medium and a device for supplying the cooling medium, which has the effect of reducing manufacturing costs. Further, by forming the cooling fins into an annular shape, it is possible to obtain a cooling structure with excellent mechanical strength.

[Brief explanation of the drawing]

FIG. In the figure, (1) is the stator, (2) is the excitation coil, (4) is the drive rotation axis - (5) is the driven rotation axis, (8) is the drive rotor, and (9) is the driven rotor. , 0 ■ is a magnetic particle, (9) is a sealed tube, ■ is a working liquid, ■ is an annular cooling fin, and (to) is a heat pie. It is a pool. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] a first connecting body; a second connecting body disposed with an annular gap on the outer peripheral surface of the first connecting body; magnetic particles loaded between the first and second connecting bodies; an excitation coil that applies a coupling torque between the respective coupling bodies by magnetizing magnetic particles; a plurality of sealed tubes mounted near the coupling surface of the second coupling body and arranged to protrude in the axial direction;
The heat pipe includes a working fluid having an evaporative property sealed under reduced pressure inside the sealed tube and a cooling fin attached to an axial protrusion of the sealed tube, and the cooling fin is annular and the plurality of sealed tubes are connected to each other. A magnetic particle type electromagnetic coupling device characterized in that it is configured to support the magnetic particle type electromagnetic coupling device.