JPS6151690B2 - - 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 coupling operation section in which magnetic particles are enclosed is located on the outer circumferential side, and a magnetic device is arranged on the inner circumference side of the coupling operation section.

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, although the heat generated at the outer peripheral connection part is cooled down through the outer peripheral fins,
The heat generated in the inner connecting part is generated by the outer connecting part being the heat source and the excitation coil located on the inner peripheral side being the heat generating source, so there is almost no heat radiation and the heat is trapped in the inner connecting part. As a result, the temperature of each connecting portion rises to a significantly high temperature, resulting in seizure of magnetic particles, increased wear, and the effects of heat, resulting in a shortened service life and an inability to obtain sufficient connecting torque. Moreover, since the voids are arranged in double layers in the radial direction and the voids are in communication, it is difficult to uniformly disperse the magnetic particles in each void, and the connection torque generated at the inner and outer circumferential connections is different. Additionally, there are drawbacks such as poor responsiveness.

Firstly, only the second connecting member facing the inner peripheral side of the first connecting surface of the first connecting part is made of a magnetic material, and secondly, only the first and second connecting members are made of a magnetic material. By forming the first and second connection main bodies from aluminum material, which is a non-magnetic material, all the magnetic flux from the magnetic device can be effectively passed through the connection operation part to improve connection performance, and the connection operation part can be connected to the magnetic device. The object of the present invention is to provide a magnetic particle type electromagnetic coupling device whose purpose is to quickly dissipate heat generated from a coupling operation part by being located on the outer periphery and improve cooling efficiency.

The embodiment shown in FIGS. 1 to 3 will be described below. In the figure, reference numeral 1 denotes a drive member which is a first connection main body that is connected to a drive source (not shown), and is composed of a connection part 1b having a first connection surface 1a on the inner periphery, and is made of a magnetic material, such as iron, into a bowl shape. It is formed. 2 is a shaft connected to a load side (not shown); 3 is a driven member fixed to the shaft 2, which is a second connection main body; the driven member is die-cast from a non-magnetic aluminum material and is formed into a disk shape. . 4 is the first connecting surface 1a of the drive member 1
A connecting member having a second connecting surface 4a facing each other via a single annular gap g on the radially inner circumferential side of the connecting member. They are fitted and integrally fixed to the driven member 3 by bolts 5. Reference numeral 6 denotes an annular non-magnetic member that magnetically divides the connecting member 4 into two, and a connecting portion 4b that is divided into two in the axial direction.
are fixed to connect them together. 7 is a magnetic particle enclosed in a single annular gap g, 8, 9
is a labyrinth that prevents the magnetic particles 7 fixed to the left side of the driven member 3 and the right side of the connecting member 4 from falling out of the single annular gap g;
10 is a dustproof cover fixed to the right opening side of the drive member 1 and has a labyrinth function that cooperates with the labyrinth 9 to prevent the magnetic particles 7 from falling out of the single annular gap g; A bearing installed between the shaft 2 and the shaft 2, and positioned by snap springs 12 and 13. A stator 14 is installed on the radially inner circumferential side of the driven member 4, 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). 15 is an excitation coil that is built in the stator 14 and is wound annularly; 16 is a bearing installed between the shaft 4 and the stator 14;
The position is determined by 8 and 19.

Next, the operation will be explained. When the drive member 1 is being rotated by the drive source, when the excitation coil 5 is energized and energized, the magnetic flux Φ is distributed between the stator 14 - one magnetic pole 14a - one coupling part 4 as shown by the dotted line in the figure.
b-magnetic particle 7-connection part 1b-excited particle 7-other connection part 4b-other magnetic pole 14a-stator 14
be distributed. Due to the electromagnetic force based on this magnetic flux Φ, the magnetic particles 7 between the first and second connecting surfaces 1a and 4a are combined in a chain shape to connect the connecting portion 1b and the connecting member 4, thereby transmitting torque from the drive member 1 to the driven member 3. will be held. Conversely, if the excitation coil 15 is deenergized, the magnetic flux Φ disappears and the connecting portion 1b by the magnetic particles 7
Since the connection between the drive member 1 and the connection member 4 is released, torque transmission from the drive member 1 to the driven member 3 is stopped. Here, when the excitation coil 15 is deenergized, the magnetic particles 7 are uniformly pressed against the entire surface of the first connecting surface 1a by the centrifugal force caused by the rotation of the drive member 1, and are spaced apart from the second connecting surface 4a. There is almost no idling torque for 3,
Therefore, the responsiveness of torque transmission is extremely stable and rapid. In addition, this prevents irregular movement of the magnetic particles 7 during idle rotation, making it possible to reduce wear caused by collisions, rubbing, etc. between the magnetic particles 7 during idle rotation. Lifespan can be extended. What is important for achieving the above-mentioned effects is to position the connecting portion between the connecting portion 1b of the drive member 1 and the connecting member 4 of the driven member 3 at the outermost periphery.

By the way, the above-mentioned connecting member 4 has an annular flange 4c on the right side and screw holes 4d formed at several places around the entire circumference of the annular flange 4c, and the driven member 3 has an annular fitting into which the annular flange 4c is fitted. Through holes 3b are formed at several locations around the entire circumference corresponding to the joint portions 3a and screw holes 4d.

Then, by fitting the annular flange 4c of the connecting member 4 into the annular fitting part 3a of the driven member 3, passing the bolt 5 through the through hole 3b and screwing it into the screw hole 4d, a cylindrical shape made of a magnetic material is formed. The connecting member 4 is integrally fixed to a disk-shaped driven member 3 made of a non-magnetic aluminum material, thereby producing a substantially bowl-shaped driven member.

In this way, the connecting member 4 made of a magnetic material is installed only at the connecting portion of the driven member that faces the first connecting surface 1a of the connecting portion 1b of the drive member 1, and the driven member 3 supporting this connecting member 4 is non-contact. According to a structure formed of aluminum material, which is a magnetic material, that is, a structure in which the connecting member 4 is installed only in a necessary part on the magnetic circuit of the driven member 3, the excitation coil 1
5, the magnetic flux Φ based on the magnetic pole 14a of the stator 14 flows through the connecting member 4 effectively without leaking to the driven member 3, so an ideal magnetic circuit can be constructed, and as a result, the connecting member 4, the magnetic particles 7 , the amount of magnetic flux flowing through the connecting portion 1b increases, and an increase in the connecting torque can be measured.

Furthermore, by locating the connecting portion between the connecting portion 1b of the drive member 1 and the connecting member 4 of the driven member 3 at the outermost periphery, the heat generated in the connecting portion is transmitted through the drive member 1, and the exposed surface area is increased. The heat generated inside the stator 14 and the like is dissipated from the outer circumferential surface of the drive member 1 to the outer circumferential atmosphere, and is dissipated through the drive member 1 via the driven member 3 made of aluminum material with high thermal conductivity. This improves the cooling efficiency of the magnetic particles 7, reducing deterioration such as seizure of the magnetic particles 7, and providing stable connection operation.

In addition, a stator 14 having a built-in excitation coil 15 is provided.
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 part 1b and the connecting member 4, 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.

In addition, 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 part, and this means that when the coupling operation part is located at the outermost periphery as in this embodiment, By arranging the stator 14 containing the excitation coil 15 on the inner circumference side of the coupling operation section, there will be no extra parts in the volume defined 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. Furthermore, with the above-described structure, the number of parts can be reduced, the shape of the parts can be simple, the yield can be improved, and the product can be easily manufactured at low cost.

4 to 7 are examples of the second invention,
In each figure, reference numeral 20 denotes a drive member which is a first connecting body coupled to a drive source (not shown), and is manufactured by die-casting from a non-magnetic aluminum material. Reference numeral 21 denotes a first connecting member having a first connecting surface 21a on the inner periphery, and is formed in a cylindrical shape from a magnetic material such as iron. integrally combined with member 20,
Only the first connecting surface 21a is exposed on the inner peripheral side. 21
b is an uneven portion formed on the outer peripheral side of the first connecting member 21.

Here, the method of integrally fixing the first connecting member 21 to the drive member 20 during die-casting of the drive member 20 will be described with reference to FIGS. 5 to 7. In each figure, 22 is a first connecting material showing the shape before formation of the first connecting member 21,
A concavo-convex portion 21b is formed on the outer periphery, which is important for performing a rotation prevention function for the drive member 20, and an annular protrusion 22a, which is important for performing a positioning function with respect to a mold, which will be described later, is formed on the inner peripheral surface. . Reference numerals 23 and 24 denote a lower mold and an upper mold for die-casting the drive member 20. The annular protrusion 22a of the first connecting material 22 fits into the lower mold 23, and the first
A fitting portion 23a is formed for positioning the connecting material 22 at a fixed position on the lower mold 23, and the upper mold 24 can be moved in the direction of the arrow.

To manufacture the drive member 20 including the first connecting member 21, first, the annular protrusion 22a of the first connecting material 22 is fitted into the insertion part 23a of the lower mold 23, and the first connecting material 22 is fixed to the lower mold 23. Then, the upper mold 24 is combined with the lower mold 23 to form a space 25, and molten aluminum is forced into the space 25 between the upper and lower molds 23 and 24 and hardened. At this time, the molten aluminum
It penetrates into the outer circumferential uneven portion 21a of the connecting material 22 and hardens while surrounding the entire circumference of the first connecting material 22. Then, the drive member material 26 integrally fixed with the first connecting material 22 is taken out from the upper and lower molds 23 and 24, and the inner circumferential side of this die-cast drive member material 26 is aligned with the solid chain line shown in FIG. By cutting to parts A and B and exposing the first connecting surface 21a of the first connecting member 21 to the inner peripheral side, the drive member 20 with the first connecting member 21 fixed integrally as shown in FIG. 4 can be manufactured. is completed. In this way, the first connecting member 21 can be integrally fixed with the drive member 20 during die-casting of the drive member 20, making manufacturing easy, and the drive member 20 and the first connecting member 21 are firmly connected through the uneven portion 21a. Therefore, movement of the first connecting member 21 in the axial and circumferential directions relative to the drive member 20 can be reliably prevented, and a stable connecting operation can be obtained.

In the above embodiment, the drive member 20 is made of aluminum, which is a non-magnetic material. The second connecting members 21 and 4 are installed, and the first and second connecting members 2
The first and second connecting members 21, 4 are formed only in the necessary portions of the magnetic circuit of the drive member 20 and the driven member 3. If the structure is installed, the magnetic velocity Φ based on the excitation coil 15 will be the first
Only the second connecting members 21 and 4 are passed through, and there is no leakage to the drive member 20 and driven member 13. Therefore, an ideal magnetic circuit can be constructed, and almost all of the magnetic flux Φ is passed through the first and second connecting members 21, 4. 4 and the magnetic particles 7, the amount of magnetic flux flowing through the coupling operation portion increases, and the coupling torque can be increased.

Moreover, the heat generated in the connecting operation part is conducted through the drive member 20 formed of aluminum with high thermal conductivity and is dissipated from the outer peripheral surface to the outer peripheral atmosphere, and the heat generated inside the stator 14 etc. is transmitted from the driven member 4 to the drive member 4. It is dissipated through the member 20, thereby significantly improving the cooling efficiency of the connecting operation part, reducing deterioration such as the burning phenomenon of the magnetic particles 7, and providing stable connecting operation.

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 the driven member.

As described above, in this invention, the connecting operation part between the first and second connecting bodies is located at the outermost periphery, and the magnetic device is arranged on the inner circumferential side of the connecting operation part, so that the heat generated in the connecting operation part is removed from the first part. The heat generated on the inner circumferential side is efficiently dissipated into the outer atmosphere through the connecting body, and the heat generated on the inner side is efficiently dissipated through the second connecting body made of aluminum, reducing deterioration such as the seizure phenomenon of magnetic particles, and providing stable heat generation. This allows connection operation to be achieved and life span to be extended. Also, the first and second
Each connecting part of the connecting body is formed of a magnetic material at a necessary part on the magnetic circuit corresponding to the connecting operation part, so that the magnetic flux is concentratedly passed through each connecting member by the magnetic device, and the excitation coil is Excellent effects such as an increase in connection torque can be obtained due to an increase in ampere turns due to a decrease in the average winding diameter.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts showing one embodiment of the present invention, FIG. 2 is a sectional view of the driven member 3, FIG. 3 is a sectional view of the second connecting member 4, and FIG. 4 is a sectional view of another embodiment. FIG. 5 is a cross-sectional view of the main part of the first connecting material 21, FIG. 6 is a cross-sectional view of the drive member material 20, and FIG. 7 is a cross-sectional view showing the manufacturing state of the drive member material 20. . In the figure, 1 and 20 are drive members, 1a is a first connecting surface, 1b is a connecting portion, 2 is a shaft, 3 is a driven member, 3a is a fitting portion, 4 is a second connecting member, and 4a is a second connecting member. A connecting surface, 4b a connecting part, 4c an annular flange, 5 a bolt, 6 a non-magnetic member, 7 magnetic particles, 8 and 9 a labyrinth, 10 a cover,
11 and 16 are bearings, 14 is a stator, 14
a is a magnetic pole, 15 is an exciting coil, 21 is a first connecting member, 21a is a first connecting surface, 21b is an uneven portion, 22
is the first connecting material, 22a is the annular protrusion, 23, 24
23a is a fitting portion, 26 is a drive member material, and g is an annular gap. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A first connecting body consisting of a connecting part made of a magnetic material and having a first connecting surface on the inner periphery; a second connecting body made of a magnetic material and facing the first connecting surface with a gap therebetween; A connecting member having a connecting surface, a second connecting body made of aluminum and to which the connecting member is fixed; magnetic particles sealed in the gap; arranged on the inner peripheral side of the connecting member, and connecting the first connecting body through the connecting member; A magnetic particle type electromagnetic coupling device comprising a magnetic device that causes a magnetic flux to flow through a coupling portion to magnetize the magnetic particles and couple the first and second coupling bodies. 2. A first connecting member formed of a magnetic material and having a first connecting surface on the inner periphery, a first connecting body formed of an aluminum material and having the first connecting member fixed thereto, a first connecting body formed of a magnetic material and having the first connecting surface a second connecting member having second connecting surfaces facing each other through a gap; a second connecting body formed of an aluminum material to which the second connecting member is fixed; magnetic particles sealed in the gap;
disposed on the inner peripheral side of the second connecting member;
A magnetic particle type electromagnetic coupling device, comprising: a magnetic device that causes a magnetic flux to flow through the first coupling member through the coupling member to magnetize the magnetic particles, thereby coupling the first and second coupling bodies.