JPS58196333A - Magnetic particle type electromagnetic coupling device - Google Patents

Abstract

PURPOSE:To improve cooling effect by passing a magnetic fluid as coolant through a cooling passage, and disposing the cooling passage adjacent to the outer peripheral surface of a driven member generating frictional heat as much as possible. CONSTITUTION:A cooling passage 15a is disposed extremely adjacent to the outer peripheral surface of a driven member 15. One end of the passage is connected to a supply path 15b, and the other end thereof is connected to a pump 17. One end of a discharge pipe 18 is connected to a discharge path 15c, and the other end therof is connected to a radiator 19. The pump 17 is connected to the radiator 19 by a pipe 20. A magnetic fluid 21 circulates through the pump 17, the supply pipe 16, the supply path 15b, the cooling passage 15a, the discharge path 15c, the discharge pipe 18, the radiator 19, the pipe 20 to the pump 17.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a pair of connecting bodies disposed opposite each other through a VCL-shaped gap, and by applying a magnetic field to magnetic particles filled in these gaps, torque can be increased. This invention relates to a magnetic particle type electromagnetic coupling device for carrying out transmission, and particularly relates to its cooling structure.

This type of coupling 'Hwt-t has a number of advantages over friction type couplings, but among them, torque can be controlled by changing the excitation current, and continuous slippage can be achieved within the range permitted by heat capacity. It has the outstanding advantage of being able to be used at any time. However, with natural cooling,
Since the range of heat capacity that can be used by continuous slipping is limited, many cooling methods using cooling media such as water have been proposed.

Hereinafter, a conventional water-cooled device will be explained using an at diagram. Incidentally, one of the pair of connecting bodies t;It shown in FIG. 10 is fixed to serve as a brake. In Figure 1, (1) if stator, (2) this stator (
A light source-like excitation coil built into the stator (1) is fixed to the stator (1) with (S) Iri bolts (not shown), and a bearing (4) is attached to the bracket that supports the stator (1).
) (5), and rotatably supports a rotating shaft (6).

[7] [, The retaining ring N (It) that prevents the axial movement of the bearings (4) and (5) is a space collar, (9
) is a drive member constituting the second connecting body fixed to the rotating shaft (6) by welding, α (l) is a plate fixed to this drive member (9) by K bolts (not shown), and ■ is Bolt (not shown) K to the stator (1)
K fixing tongue is a bracket that connects the stator (1) and a driven member (b) to be described later. a2 This bracket) (Ic port (not shown)) is fixed by VC and constitutes the connection main body of 11!1 provided inside the drive member (9) with a predetermined radial annular gap. (12aX 12b) I
d A water supply channel and a drainage channel provided in this driven member (6), through which cooling water (b) described later flows, (12o) Fi
It is an annular cooling passage that communicates with these water supply channel (12 m) and drainage channel (121).

Q3 is magnetic particles filled with 1liK in the annular space between the drive member (9) and the driven member (6), and 04 is cooling water forced to flow through the cooling passage (12o).

Next, the operation of the above conventional device will be explained. When a rotating shaft (6) connected to a drive source (not shown) is rotating and the drive member (9) is rotating together with the rotating shaft (6),
When the excitation coil (2) built in the stator (1) is excited by the power supply device t (If!! not shown) VC, the stator (1) and the drive member (-
), driven member QIK magnetic flux (Φ) is generated, and magnetic particles 0, which are part of this magnetic path, are connected between the rotating drive member (9) and the stationary driven member (6). It solidifies and combines into a chain, forming the drive member (9) F
i It is stopped together with the rotating shaft (6) or rotates while being braked. This slip generates frictional heat,
This frictional heat causes the drive member (9), the magnetic particles, and the driven member (6) to become extremely heated. If these temperatures become excessive, the drive member (11
) may cause problems such as burnout of the excitation coil (g) near the excitation coil (g).

By the way, in order to absorb this frictional heat, the cooling water (b), which is a cooling medium, is introduced from the water supply channel (12&), is made to flow through the cooling channel (12o), and then flows through the drain channel (12b).
is discharged from. In this way, the driven member (6) is cooled by this cooling water Q4, and thereby the magnetic particle box and drive member Δ(9) are also cooled, so that the temperature near the drawer is lowered.

However, in the conventional device described above, the cooling passage (12c) is arranged inside the outer circumferential surface of the driven member @ where frictional heat is generated or separated by a magnetic passage that allows the magnetic flux (Φ) to pass through. In other words, this frictional heat is cannot be absorbed sufficiently, and the function of this device cannot be fully utilized. In addition, if the cooling passage (12o) of the conventional device structure is brought closer to the outer circumference [fTK] of the driven member (6), the magnetic
It becomes impossible to obtain a magnetic path through which the season can pass through,
On the other hand, if you try to get enough magnetic paths, there are drawbacks such as the cooling path becomes extremely small.

This invention was made in order to eliminate the drawbacks of the conventional device as described above, and by circulating a magnetic fluid as a cooling medium in the cooling passage, this magnetic fluid becomes a part of the magnetic circuit, and the cooling The passage is provided as close as possible to the outer surface of the driven member where frictional heat is generated,
This is intended to improve the cooling effect.

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

In Figure 2, 4 is the driven member, (16a) F
i This is an annular cooling passage provided very close to the outer surface of this driven member (towards), one end of which is the supply passage (15b) K, and the other end is the discharge passage (15o) VC soh.
(') is an aaFi supply pipe, one end of which communicates with the above-mentioned supply passage (15b) [and the other end with the pump Q7]K. (to) is a discharge pipe, one end of which communicates with the above-mentioned discharge path (15c), and the other end communicates with the radiator (2). The pump and the radiator 4 are connected through a pipe g3. @ is a magnetic fluid, which includes the pump Qη, the feeding femoral head, the feeding passage (15b), the cooling passage (15&), and the discharge passage (
15o), the discharge pipe 01 to the radiator), the pipe (e), and the pump Q7).

Note that the other structures Fi are the same as those in FIG. 1, so the explanation will be omitted.

Next, its effect will be explained. First, the excitation coil (2
), the magnetic flux (Φ) flows through the cooling passage (15a).
The magnetic fluid (2) inside is used as a magnetic path to flow as shown by the dotted line.

That is, in the conventional device, the magnetic flux uses only the outer 8s of the cooling path as a magnetic path, whereas in the present invention, the magnetic flux is generated only in the outer 8s of the cooling path.
5&) itself is configured as a magnetic path. In addition,
Driven member (to) forming the outer shell of the cooling passage (15m)
There is also a magnetic path near the outer periphery, albeit slightly. The functions other than those described above are the same as those of the conventional device, so they will be omitted.◇As described above, according to the present invention, the cooling passage (15m) has a lower friction than the conventional cooling passage (12o). 111 outside of driven member 4 where heat is generated! Since the cooling passage (15a) itself is a magnetic passage by disposing the cooling passage (15a) very close to the cooling passageway (15a) and circulating magnetic fluid therein, it is possible to absorb frictional heat extremely efficiently without disturbing the circulation of magnetic flux. can.

In addition, in the above-mentioned embodiment, the magnetic particle formula 1 [6BN! ! Although a brake device has been described as a coupling device, the same applies to a clutch device as another application example. In this case, the driven member (to) may be made rotatable using a bearing or the like.

Further, in the above embodiment, the inlet passage and the discharge passage may be reversed, and even if the radiator is replaced by a mere tank, a considerable cooling effect cannot be obtained. In addition, the cooling passage (15a)
may be provided close to the portion of the driven member where frictional heat is generated, and does not need to be annular.

As described above, according to the present invention, the cooling passage can be provided very close to the outer INK of the driven member where frictional heat is generated without disturbing the flow of magnetic flux, so that it can absorb frictional heat much better than conventional devices. This has the effect of providing an excellent device that is easy to use. In addition, since the magnetic fluid is a good material because the magnetic material is dispersed in the oil, there is no need to apply anti-rust treatment to the cooling passages as is the case when cooling with water.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional device, and FIG. 2 is a sectional view showing an embodiment of the present invention. In the figure, (fl) is the Fi stator, (2) is the excitation coil, (
6) is the rotating shaft, (g) is the drive member, Q3Fi magnetic particles, (to) is the driven member, (16a) is the cooling passage, (15b) is the supply passage, (15G) is the discharge passage, αG is the supply pipe , σ7) Fi pump, aS is a discharge pipe, QQti radiator, (c) is a magnetic fluid 0 In addition, the same symbols in the figure are the same -
or a corresponding portion. Agent Shin Kuzuno −

Claims (1)

[Scope of Claims] +1) A first connecting body, a second connecting body disposed with respect to the first connecting body through a predetermined radial annular gap, and a second connecting body disposed with a predetermined radial annular gap filled in the annular gap. an excitation device that generates a coupling torque between the respective coupling bodies by magnetizing the magnetic particles with each coupling body as a magnetic path; In S, a cooling passage is provided in the vicinity of the annular gap, and a magnetic particle type 1 set is characterized in that a magnetic fluid is circulated in the cooling passage. The magnetic particle type electromagnetic coupling device according to claim 1, characterized in that an exchanger is provided to circulate the magnetic fluid.