JPS6132171Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a magnetic particle type electromagnetic coupling device having a structure in which an excitation coil is disposed on the radially inner circumferential 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. Moreover, the voids are arranged in double radial direction,
In addition, since the structure has interconnected voids, it is difficult to uniformly disperse the magnetic particles in each void.
This method has drawbacks such as different connection torques occurring at the inner and outer connecting portions and poor responsiveness.

This device arranges connecting members made of magnetic material only at the necessary connecting parts of the first connecting body, wraps a band-shaped plate material around the connecting member in an annular shape, and fixes both ends of the wound plate material. The present invention provides a magnetic particle type electromagnetic coupling device having a simple and inexpensive structure by bending a part of a plate material around which a mounting flange is wound and integrally forming the coupling member.

The embodiment shown in FIGS. 1 to 4 will be described below. In the figure, 1 is a drive member that is the first connection body coupled to a drive source (not shown),
It is manufactured by die-casting from a non-magnetic material such as aluminum. Reference numeral 2 denotes a connecting member having a first connecting surface 2a on the inner periphery, and mounting flanges 2b protruding toward the outer periphery in the radial direction are formed at several locations, for example, four locations around the entire side circumference of the connecting member 2. 2
A mounting hole 2c is formed in each of the holes 2c. Further, the connecting member 2 is formed into a cylindrical shape from a magnetic material such as an iron plate, which will be described in detail later, and this cylindrical connecting member 2 is integrally connected to the drive member 1 during die-casting of the drive member 1 described above. The first connecting surface 2a is exposed on the inner periphery, and each mounting flange 2b projects on the outer periphery. Although each mounting flange 2b is not shown, there is a mounting hole 2 in the drive source such as a prime mover.
It is fixed with a bolt that fits c. 4 is a shaft connected to a load side (not shown); 5 is a first connecting surface 2a of the connecting member 2 fixed to the shaft 4;
A driven member that is a second connection main body, which is a second connection main body consisting of a connection part 5b having a second connection surface 5a facing each other via a single annular gap g on the radially inner circumferential side of the drive member, and formed in a bowl shape from a magnetic material such as iron material has been done. Reference numeral 6 denotes an annular non-magnetic member that magnetically divides the connecting portion 5b of the driven member 5 into two.
fixed to connect. 7 is a magnetic particle enclosed in a single annular gap g; 8 and 9 are labyrinths 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 A dustproof cover 11 is fixed to the right opening side surface 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.
is a bearing installed between the drive member 1 and the shaft 4, and is positioned by snap springs 12 and 13. 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 indicates an excitation coil which is built into the stator 14 and is wound annularly. Reference numeral 16 indicates a bearing mounted between the shaft 4 and the stator 14, and is positioned by snap springs 17, 18, and 19.

Here, the above-mentioned connecting member 2 is manufactured as follows. First, a pair of connecting materials 3a, a mounting material 3b, and the mounting material 3 are punched out by press processing into the shape of the belt-shaped iron plate 3 shown in FIG.
A hole 3c located at point b is formed. The connecting material 3a is connected in the longitudinal direction, and the mounting material 3b is connected to the connecting material 3a.
located at a predetermined distance on one side of the

Next, the connecting material 3a is cut to an appropriate length, wound into an annular shape, both ends of the connecting material 3a are abutted, and the abutted portions are joined by welding to form the cylindrical connecting member 2. Next, each mounting material 3b protrudes in the axial direction from one side of the cylindrical connecting member 2.
If the mounting flanges 2b are bent and protruded toward the radial outer periphery as shown in FIG.
The manufacturing of the connecting member 2 in which the are integrally formed is completed. In addition, A is a welding part which joins the butt part of the connection material 3a.

Furthermore, in order to join the connecting member 2 and the drive member 1, the connecting member 2 shown in FIG. It is done by doing.

Next, the operation will be explained. Now, when the connecting member 2 and the drive member 1 are rotating via the mounting flange 2b by a driving source such as a prime mover, when the exciting coil 15 is energized and energized, the magnetic flux Φ is transferred to the stator 14- One magnetic pole 14a - one connecting part 5b - magnetic particles 7 - connecting member 2 - magnetic particles 7 - other connecting part 5b - other magnetic pole 14 a - stator 14 is passed 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 connected in a chain to connect the connecting member 2 and the connecting part 5b, so the rotational force of the drive source is transmitted from the connecting member 2 to the driven member 5. Conversely, when the excitation coil 15 is deenergized, the magnetic flux Φ disappears, and the connection between the connecting member 2 and the connecting part 5b by the magnetic particles 7 is released, so the torque transmission from the connecting member 2 to the driven member 5 is stopped. .

Further, the cylindrical connecting member 2 located at the outermost periphery and made of a magnetic material such as iron is made to face only the second connecting surface 5a of the connecting portion 5b of the driven member 5, and is used as a magnetic circuit for obtaining the necessary connecting torque. , and the connecting member 2 is supported by the drive member 1 made of a non-magnetic material such as aluminum so that the first connecting surface 2a is exposed on the inner periphery. By arranging the connecting member 2 only in that part, 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 other parts than the connecting member 2 can be minimized. , an efficient magnetic circuit can be constructed, and almost all of the magnetic flux Φ is caused by the magnetic particles 7 and the connecting portion 5b.
and acting on the connecting member 2, the connecting force is significantly improved.

In addition, by locating the connecting part between the connecting member 2 and the connecting part 5b at the outermost periphery, and by fixing the connecting member 2 integrally with the drive member 1 during aluminum die-casting of the drive member 1, it is possible to prevent the occurrence of problems in the connecting part. The generated heat is conducted through the drive member 1, which has high thermal conductivity and is exposed on the outer periphery, and is dissipated into the outer periphery atmosphere, resulting in efficient heat dissipation, that is, improved cooling efficiency, and the phenomenon of seizure of the magnetic particles 7, etc. This reduces deterioration and provides stable connection operation.

Further, the cylindrical connecting member 2 that is integrally fixed to the drive member 1 is a belt-shaped iron plate 3 shown in FIG.
is punched into the shape of the dashed line A shown in the figure, and cut to a predetermined length to form a strip-shaped connecting material 3a having a mounting material 3b. A rod-shaped iron material is manufactured by joining both ends of the connecting material 3a at the welding part A, and further bending each mounting material 3b toward the outer circumferential side in the radial direction to form a plurality of mounting flanges 2b having mounting holes 2c. Compared to manufacturing a cylindrical connecting member by cutting the center part of the cylinder and welding multiple mounting flanges to the connecting member, the processing work is simpler, the processing time is shortened, and the material yield is significantly improved and the cost is reduced. It can be manufactured.

Although the clutch has been described above, it can be used as a brake by fixing the drive member 1 or the driven member 5.

As described above, this invention forms the first connecting body from a non-magnetic material, and excitation is made to fix the annular connecting member made of the magnetic material to a necessary part of the magnetic circuit of the first connecting body. The magnetic flux of the coil does not flow through the first connecting body but flows only through the connecting member, so that the leakage of the magnetic flux can be significantly reduced, and the connecting torque can be increased because it acts effectively on the magnetic particles. becomes possible. Moreover, since the connecting member is formed by winding a band-shaped plate material and fixing both ends of the plate material, and the mounting flange is formed by bending a part of the plate material wound in an annular shape, the connecting member has the mounting flange. Since the material yield is improved and the processing is simple, it can be manufactured easily and inexpensively.

Moreover, since the connecting member integrally fixed to the first connecting body is connected to the drive source etc. via the mounting flange integrally formed on this connecting member, the first connecting member is connected to the drive source etc.
Compared to a structure in which the connecting member is supported through the connecting body, the bonding strength is significantly improved, and the mounting structure of the first connecting body and the connecting member can be simplified, and other excellent effects can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of this invention, FIG. 2 is a sectional view of a main part of a connecting member 2, FIG. 3 is a perspective view of a connecting member 2, and FIG. It is a front view. In the figure, 1 is a drive member, 2 is a connecting member, 2a is a first connecting surface, 2b is a mounting flange, 2
c is a mounting hole, 3 is a steel plate, 3a is a connecting material, 3b is a mounting material, 3c is a hole, 5 is a driven member, 5a
is a second connecting surface, 5b is a connecting portion, 6 is a non-magnetic member,
7 is a magnetic particle, 14 is a stator, 15 is an excitation coil, and g is an annular gap. Note that the same reference numerals in each figure indicate the same parts.

Claims (1)

[Scope of utility model registration request] a first connecting body formed of a non-magnetic material; a connecting member formed in an annular shape of a magnetic material, fixed to the first connecting body and exposing a first connecting surface on the inner periphery; a mounting flange protruding from the outer periphery of the first connecting body; a second connecting body formed of a magnetic material and having a second connecting surface facing the inner circumferential side of the first connecting surface with a gap in between; a second connecting body sealed in the gap; The connecting member is provided with magnetic particles and an excitation coil installed on the inner peripheral side of the second connecting body to magnetize the magnetic particles and connect the first and second connecting bodies. A magnetic particle type electromagnetic connection characterized in that a plate material is wound in an annular shape and both ends of the plate material are fixed, and the mounting flange is formed by bending a part of the annularly wound plate material. Device.