JPS6152328B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic particle type electromagnetic coupling device having a structure in which a magnetic device is disposed on the radially inner peripheral side of each coupling portion in which magnetic particles are enclosed.

As a conventional example of this kind, the one described in Japanese Utility Model Publication No. 51-20351 has been proposed, but in this one, the driven part is located between the drive part and the drive part cover that is integrally fixed to the drive part. This is a double-connected structure in which magnetic particles are respectively enclosed in the gap between the driven part and the drive part and in the gap between the driven part and the drive part cover.

However, with this structure, the heat generated at the outer connection is cooled down through the outer fins, but the heat generated at the inner connection is due to the fact that the outer connection is the heat source and the excitation located on the inner side. Since the coil is the heat source, there is almost no heat dissipation and the heat is trapped in the inner peripheral joints, which causes the temperature of each joint to rise significantly, resulting in the burning of magnetic particles, increased wear, and the effects of heat. As a result, the service life is shortened and sufficient connection torque cannot be obtained.

This invention improves the connection performance and improves the connection by arranging the connection operation part between the connection member and the second connection body on the outer peripheral side of the magnetic device, and by arranging cooling fins on the first connection body that supports the connection member. The present invention provides a magnetic particle type electromagnetic coupling device whose purpose is to efficiently dissipate heat generated in an operating part.

The embodiment shown in FIG. 1 will be described below.
In the figure, reference numeral 1 denotes a drive member which is a first connecting body coupled to a drive source (not shown), and is manufactured by die-casting aluminum. Reference numeral 1a denotes a plurality of cooling fins installed at several locations around the outer periphery of the drive member 1. The plurality of cooling fins 1a are manufactured integrally with the drive member 1 when the drive member 1 is die-cast. Reference numeral 2 denotes a connecting member having a first connecting surface 2a on the inner periphery, and is formed into a cylindrical shape from a magnetic material such as iron. The first connecting surface 2a is only exposed to the inner periphery. That is, the plurality of cooling fins 1a and the connecting member 2 are integrally fixed to the drive member 1, and the cooling fins 1a are located on the side of the connecting member 2 opposite to the first connecting surface 2a. 4 is a shaft coupled to a load side (not shown); 5 is a single annular gap g fixed to the shaft 4 on the radially inner circumferential side of the first coupling surface 2a of the coupling member 2;
The drive member is a second connection main body consisting of a connection surface 5b having a second connection surface 5a facing each other via a second connection surface 5a, and is formed into a bowl shape from a magnetic material such as iron. Reference numeral 6 denotes an annular non-magnetic member that magnetically divides the connecting portion 5b of the driven member 5 into two, and is fixed to connect the two divided connecting portions 5b. 7
is a magnetic particle enclosed in a single annular gap g, 8,
Labyrinths 9 are fixed to both sides of the driven member 5 to prevent the magnetic particles 7 from falling out of the single annular gap g; 10 is fixed to the right open side of the drive member 1 and cooperates with the labyrinths 9; 11 is a bearing installed between the drive member 1 and the shaft 4, and is positioned by snap springs 12 and 13. has been done. A stator 14 is installed on the radially inner circumferential side of the driven member 5, and has a pair of annular magnetic poles 14a facing the radially inner circumferential surface of the two-divided connecting portion 5b with a gap therebetween, and is made of a magnetic material such as iron. Rotation is prevented by a rotation preventing member (not shown). Reference numeral 15 denotes an excitation coil which is built into the stator 14 and is wound in an annular manner. Together with the tetator 14, the excitation coil constitutes a magnetic device. 16 is a bearing installed between the shaft 4 and the stator 14;
It is positioned by snap springs 17, 18, and 19.

Next, the operation will be explained. When the drive member 1 is being rotated by the drive source, when the exciting coil 15 is energized and energized, a magnetic flux Φ is generated between the stator 14, one magnetic pole 14a, and one connecting portion 5, as shown by the dotted line in the figure.
b-Magnetic particle 7-Connection member 2-Magnetic particle 7-Other connection portion 5b-Other magnetic pole 14a-Stator 14
Flow through. Due to the electromagnetic force based on this magnetic flux Φ, the magnetic particles 7 between the first and second connecting surfaces 2a and 5a are combined in a chain shape to connect the connecting member 2 and the connecting part 5b, thereby transmitting torque from the drive member 1 to the driven member 5. will be carried out. Conversely, when the excitation coil 15 is deenergized, the magnetic flux Φ disappears and the connection between the connecting member 2 and the connecting portion 5b by the magnetic particles 7 is released, so that the torque transmission from the drive member 1 to the driven member 5 is stopped.

In this embodiment, which is constructed and operates as described above, the connecting portion between the connecting member 2 and the connecting portion 5b is located at the outermost periphery, and the excitation coil 1 is placed inside the connecting portion.
By arranging the stator 14 equipped with the drive member 1 and integrally forming a plurality of cooling fins 1a on the outer peripheral side of the drive member 1 in the vicinity of the connecting member 2, the following features can be obtained.

That is, first, the connecting operation part between the connecting member 2 and the connecting part 5b is positioned at the outermost periphery, and the connecting member 2 is integrally fixed with the drive member 1 during aluminum die-casting of the drive member 1, thereby forming the connecting operation part. The generated heat is conducted through the connecting member 2 to the drive member 1 made of aluminum, which has extremely good thermal conductivity, and is quickly transferred to the outer atmosphere from the outer circumferential surface of the drive member 1 and the outer circumferential surfaces of the plurality of cooling fins 1a. Heat is dissipated efficiently and cooling efficiency can be significantly improved. Moreover, since the drive member 1 is constantly rotated by the drive source, the plurality of cooling fins 1a are constantly rotated regardless of the connection operation, so that conduction is transmitted to the outer peripheral surface of the drive member 1 and the outer peripheral surface of the plurality of cooling fins 1a themselves. Since the heat generated is always forcibly dissipated by the rotation of the plurality of cooling fins 1a, the cooling efficiency of the coupling operation part is further improved, and therefore deterioration such as the seizure phenomenon of the magnetic particles 7 is significantly reduced, resulting in stable coupling. You can get the action. In this connection, the connecting member 2
By integrally fixing the connecting member 2 and the drive member 1 to the drive member 1 by die-casting, the joint between the connecting member 2 and the drive member 1 is firmly attached without any gaps, so the thermal conductivity at the joint becomes high. ,
Therefore, heat generation is efficiently conducted from the connecting member 2 to the drive member 1, and the cooling efficiency is further improved.

In addition, the connecting member 2 located at the outermost periphery and made of a magnetic material such as iron material is made to face only the second connecting surface 5a of the connecting portion 5b of the driven member 5, thereby forming a magnetic circuit for obtaining the necessary connecting torque. A structure in which the connecting member 2 is supported by the drive member 1 made of aluminum so that the first connecting surface 2a is exposed on the inner periphery, that is, the connecting member 2 is arranged only in necessary parts on the magnetic circuit. With this structure, the magnetic flux Φ flows only through the connecting member 2 from the connecting part 5b of the driven member 5, and leakage of the magnetic flux Φ to areas other than the connecting member 2 can be extremely reduced.
An efficient magnetic circuit can be constructed, and almost all of the magnetic flux Φ is generated by the magnetic particles 7, the connecting portion 5b, and the connecting member 2.
The coupling torque is significantly improved.

In addition, a stator 14 equipped with an excitation coil 15
The average winding diameter of the excitation coil 15 can be made small by arranging it on the inner circumferential side of the connecting operation part between the connecting member 2 and the connecting part 5b, and the ampere turns become large because it is inversely proportional to the average winding diameter of the coil. Even with a small average winding diameter, the increase in ampere turns can be measured. This is because if the same ampere turns are set, it is possible to wind a winding with a smaller wire diameter, reducing the weight of the winding of the excitation coil 15, and at the same time reducing the outer diameter of the stator 14. Can be manufactured small and inexpensively.

Moreover, in the case of a magnetic particle type electromagnetic coupling device, the transmitted torque is proportional to the axial width and the square of the diameter of the coupling operation section, which means that when the coupling operation section is located at the outermost periphery as in this embodiment, By arranging the stator 14 equipped with the excitation coil 15 on the inner circumferential side of the coupling operation section, there will be no extra parts in the volume determined by the coupling operation section other than the stator 14, which is essential for performing the coupling operation. Therefore, a magnetic particle type electromagnetic coupling device can be manufactured with minimum space and weight.

FIG. 2 shows another embodiment, in which the connecting member 2 is fitted into the drive member 1 manufactured by aluminum die-casting, and the drive member 1 and the connecting member 2 are integrated by screwing the bolt 20. In addition, a plurality of cooling fins 1a are integrally molded on the drive member 1 at several locations around the outer circumference of the drive member 1, and the outer circumferential surface of the connecting member 2 is exposed to the outer circumferential atmosphere.

According to this embodiment, the heat generated in the connecting operation section between the connecting member 2 and the connecting part 5b of the driven member 5 is radiated directly from the outer circumferential surface of the connecting member 2 to the outer peripheral atmosphere through the connecting member 2, and also through the connecting member 2. It is conducted to the outer circumferential surface of the drive member 1 and the outer circumferential surfaces of the plurality of cooling fins 1a and is dissipated into the outer circumferential atmosphere. Further, the heat transmitted to the outer circumferential surface of the connecting member 2, the outer circumferential surface of the drive member 1, and the outer circumferential surface of the plurality of cooling fins 1a is transferred to the plurality of cooling fins 1a.
Due to the rotational action of , it is forcibly dissipated into the outer peripheral atmosphere, and the above-mentioned cooling operation efficiently cools the connecting operation part. Furthermore, by arranging the plurality of cooling fins 1a to face the outer circumferential surface of the connecting member 2 exposed to the outer circumferential atmosphere as shown in FIG. 3, the cooling efficiency is further improved.

Although the above embodiment has been described as a clutch device, it can also be applied as a brake device by fixing either the drive or driven members 1 and 5.

As described above, this invention locates the connection operation part between the connection member and the second connection main body at the outermost periphery, and arranges the stator equipped with the excitation coil on the inner circumference side of the connection operation part. The heat generated is generated by the connecting member and the first
It is dissipated into the surrounding atmosphere through the connecting body. Moreover, the first connecting body is made of aluminum material with high thermal conductivity, and the heat dissipation from the cooling fins to the surrounding atmosphere is improved, so the connecting operation parts are cooled with high efficiency. Therefore, deterioration such as the seizure phenomenon of magnetic particles can be reduced, stable connection operation can be obtained, and the service life can be extended. Moreover, the connecting member is formed of a magnetic material and placed in a necessary part on the magnetic circuit corresponding to the connecting operation part, and this connecting member is connected by the first connecting body made of aluminum material, which is a non-magnetic material. By supporting the excitation coil, the magnetic flux from the excitation coil is concentratedly passed through the connection member without leaking to the first connection main body, etc., and this is coupled with an increase in ampere turns due to the reduction in the average winding diameter of the excitation coil. Excellent effects such as an increase in connection torque can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing one embodiment of the present invention, FIG. 2 is a sectional view of a main part showing another embodiment, and FIG.
The figure is a sectional view of a main part showing another embodiment. In the figure, 1 is a drive member, 1a is a cooling fin, 2 is a connecting member, 2a is a first connecting surface, 4 is a shaft, 5 is a driven member, 5a is a second connecting surface, 5b is a connecting portion, and 6 is a connecting member. a non-magnetic member; 7 is a magnetic particle; 8 and 9 are labyrinths; 10 is a cover; 11;
16 is a bearing, 14 is a stator, 14a is a magnetic pole, 15 is an exciting coil, 20 is a bolt, and g is an annular gap. Note that the same reference numerals in each figure indicate the same parts.

Claims (1)

[Scope of Claims] 1. A first connecting body made of an aluminum material, a connecting member fixed to the first connecting body and having a first connecting surface on the inner periphery and made of a magnetic material, the first connecting body made of a magnetic material.
a second connecting body formed of a magnetic material and having a second connecting surface facing the inner peripheral side of the connecting surface with a gap therebetween; magnetic particles sealed in the gap; and an inner peripheral side of the second connecting body a magnetic device disposed in the connecting member and the second connecting body, magnetizing the magnetic particles by passing a magnetic flux through the connecting member and the second connecting body, and connecting the first and second connecting bodies; A magnetic particle type electromagnetic coupling device comprising a cooling fin installed in a direction crossing the coupling body and dissipating heat generated in a coupling operation portion between the coupling member and the second coupling body to the outside. 2. The magnetic particle type electromagnetic coupling device according to claim 1, wherein the first coupling body is cast and molded, and the coupling member is integrally fixed by casting the first coupling body. 3. The magnetic particle type electromagnetic coupling device according to claim 1 or 2, wherein the cooling fin is integrally cast with the first coupling body. 4. According to any one of claims 1 to 3, the cooling fins are located on the side opposite to the first connecting surface of the connecting member and are installed at several locations around the entire circumference of the first connecting body. magnetic particle type electromagnetic coupling device. 5. Claims 1 to 4, characterized in that the outer periphery of the connecting member is exposed to the outside and fixed to the first connecting body, and cooling fins are installed on the outer periphery of the first connecting body. The magnetic particle type electromagnetic coupling device according to any one of the above.