JPS5930930B2 - Permanent magnet type magnetic powder type coupling device - Google Patents

Description

Detailed Description of the Invention The present invention transmits torque by magnetizing magnetic powder housed in a pair of rotors or in a gap between a rotor and a stator using the magnetic force unique to a permanent magnet. This invention relates to a permanent magnet type magnetic powder coupling device that performs a braking action.

Conventionally, a magnetic powder coupling device is generally known that applies magnetizing force to magnetic powder only by the magnetomotive force of a permanent magnet without using an electromagnetic coil in order to save power. Because a permanent magnet is simply provided in the magnetic circuit for passing magnetic flux into the air gap that accommodates the magnetic flux, the generated torque is uniform and it is impossible to reduce the torque to zero or control it to an appropriate value. It is.

The present invention eliminates the above conventional drawbacks by combining a permanent magnet and a control ring, and enables the generated torque to be arbitrarily controlled from zero to a maximum value. details.

In the drawing, 1 is a yoke with brackets 2 on both ends.
and 3.

Reference numeral 4 denotes an annular permanent magnet having both the inner and outer circumferential surfaces as magnetized surfaces, which is embedded in the yoke 1 so as not to expose the magnetized surface to the yoke array. -It is in a state where it is integrally sandwiched between two parts.

The yoke 1 and the permanent magnet 4 are divided into left and right halves by a control ring inserted in the center of the yoke 1, and can be rotated freely in the circumferential direction.

The antibacterial ring has a magnetic ring part 5-1 with high magnetic permeability located on the outside, a non-magnetic ring part 5-2 located in the middle, and a ring part with high magnetic permeability located on the inside and in the circumferential direction. It consists of a ring portion 5-3 formed by alternately arranging magnetic material portions a and non-magnetic material portions, and the magnetic ring portion 5-1 is connected to the yoke 1.
The non-magnetic ring part 5-2 is in contact with the left and right parts of the permanent magnet 4, and magnetically connects both the left and right magnetic poles of the permanent magnet 4 with this part. This prevents magnetic interference between both magnet parts.

Furthermore, the ring part 5-3 of the antibacterial ring 5 is located in the middle heat part of the inner part 1-2 of the yoke 1, and the ring part 5-3 of the inner yoke part 1-2 of the yoke 1 opposite to this part Convex portions C and concave portions d are provided alternately in the circumferential direction, and this portion and the ring portion 5-3 constitute a magnetic short circuit for the magnetic flux generated by the permanent magnet 4.

Note that the recess d of the inner yoke portion 1-2 may be filled with a nonmagnetic material.

The outer connecting member has a cylindrical portion γ and a shaft portion 8, and is supported on the bracket 3 via a bearing 9 at the shaft portion 8.

Reference numeral 10 is a non-magnetic ring provided at the medium heat portion of the cylindrical portion 7 for the connecting member, and magnetically divides the cylindrical portion γ into left and right halves.

Reference numeral 11 denotes a plate attached to the open end of the cylindrical part 1 for the connecting member, and 12 denotes an inner connection whose circumferential surface faces the inner circumferential direction of the cylindrical part 1 for the outer connecting member across a gap. It is fixed to the bracket 2 with a member.

13 is a magnetic powder housed in the gap between the attraction connecting member and the inner connecting member 12.

The embodiment of the present invention is constructed as described above, and when used as a clutch, it is used as an inner and open connecting member.

One of the 12 serves as an input side, and the other serves as an output side.

In the case of a brake, one side is the braked side, and the other is fixed to an appropriate fixed part so that it does not rotate.

In the above configuration, the inner and outer circumferential surfaces of the permanent magnet 4 are magnetized surfaces, so that the inner yoke portion 1-2 of the yoke 1 is restricted (
Goods) Convex portion C of the portion facing the ring portion 5-3 of each ring
As shown in FIG. 3, polarity is generated in this state, and when the entire surface of the magnetic material part a of the ring part 5-3 of the control ring is in contact with this convex part C, a magnetic short circuit is created in this part. The magnetic flux generated by the permanent magnet 4 passes through the magnetic member a and returns to the permanent magnet,
It does not pass through the gap containing the magnetic powder 13,
Therefore, the magnetic powder is not magnetized and no torque is transmitted between the connecting members 6 and 12.

In addition, when the control rings are rotated so that the entire surface of the non-magnetic portion of the ring portion 5-3 of this ring is brought into contact with the convex portion C of the yoke portion 1-2, the magnetic short circuit will occur. Therefore, the magnetic flux emitted from one magnet part of the permanent magnet penetrates the gap between the yoke part 1-2 and the cylindrical part 1 for the connecting member, the cylindrical part 1, and the gap that accommodates the magnetic powder 13. After reaching the inner connecting member 12f, the magnetic powder accommodation gap, the cylindrical portion γ of the outer connecting member l, and the cylindrical portion and the yoke portion 1
-2, and the yoke portion 1-2, and return to the other permanent magnet portion, and the magnetic powder 13
is magnetized, and the maximum transmission torque is generated between both connecting members l and 12.

When the control ring 5 is rotated appropriately, the contact area of the magnetic material portion a of the inner ring portion 5-3 of this ring with the convex portion a of the yoke portion 1-2 gradually changes, and the magnetic powder 13 The amount of magnetic flux passing through the air gap accommodating the magnetic flux changes. Therefore, by rotating the control rings, it becomes possible to arbitrarily control the torque transmitted between the two connecting members 12 from zero to the maximum value. .

The present invention can reduce the generated torque between both connecting members to zero by simply adding such a simple control ring, or can arbitrarily smoothly and finely control the torque, thereby expanding its uses and further improving its implementation. As in the example above, by placing the yoke part in close contact with the magnetized surface of the permanent magnet, and by configuring the control ring etc. to not directly slide on the magnetized surface of the magnet, it is possible to prevent the characteristics of the permanent magnet from deteriorating. In addition, by magnetically connecting the magnetized surfaces of both permanent magnet parts via the magnetic material part of the control ring,
It is possible to increase the operating point of the magnet, thereby increasing the extraction magnetic flux density and increasing the generated torque.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view showing the upper half in longitudinal section, and FIG. 2 is a cross-sectional view of only the upper half.
FIG. 3 is an enlarged partial view. 1...Yoke, 4...Permanent magnet, 5...
...Control Jing, Dan...Outer connection member,
12... Inner connecting member, 13... Magnetic powder.

Claims (1)

[Claims] 1 Example Inner and outer connecting members facing each other with a gap between the circumferential surface and the inner circumferential surface; Magnetic powder housed in the gap;
A yoke that surrounds the above-mentioned outer connecting member and is divided into left and right parts, and these two side parts sandwich an annular permanent magnet in the radial direction, and are formed by the row side part; the open magnetic ring part, and the circumferential direction It consists of an inner ring part formed of magnetic material parts and non-magnetic material parts arranged alternately, and a non-magnetic ring sandwiched between the outer magnetic ring part and the inner ring part, and this non-magnetic ring is A rotatable control N'J ring having an outer magnetic ring part and an inner ring part sandwiched between the left and right parts of the yoke is provided between the left and right permanent magnets, and the control ring H' of the yoke is provided with On the part facing the side of the inner ring of the J-ring,
A concavo-convex portion is provided to change the magnetic path area of the magnetic short-circuit that passes between this and the inner ring portion, and the rotation of the control ring blocks the magnetic flux passing through the magnetic short-circuit or changes the amount of magnetic flux. A permanent magnet type magnetic powder type coupling disorder characterized by controlling the generated torque by