JPS6226264B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic joint, particularly a magnetic hysteresis clutch or a magnetic hysteresis brake using semi-hard magnets and permanent magnets facing each other.

A magnetic hysteresis clutch or magnetic hysteresis brake that uses a permanent magnet as an excitation source to excite a semi-hard magnet can be made thinner in the axial direction compared to an electric type that passes current through an excitation coil. It has the advantage of not requiring a power source.
On the other hand, those using permanent magnets can have a relatively small capacity, but if a large capacity is required, it is necessary to configure multi-stage disk-shaped semi-hard magnets and permanent magnets. . However, simply arranging a large number of permanent magnets on an iron plate called a back plate and using these in multiple stages does not provide the advantage of being thinner in the axial direction, increases the weight, and is difficult to assemble. It becomes difficult, etc.
It has various drawbacks, and many problems were encountered before it was put into practical use.

Based on this, the inventor of the present application first made a non-magnetic disk,
We proposed a multistage magnetic joint with a new configuration in which multiple magnets are embedded. (Japanese Unexamined Patent Publication No. 52-119748) However, the above-mentioned method in which a magnet is embedded in a non-magnetic disk is not necessarily satisfactory under all practical usage conditions. In view of the above background, the present invention has an easy-to-assemble structure in which permanent magnets are arranged facing each other on both sides of a semi-hard magnet, and the permanent magnets are glued to a two-part yoke housing and fixed to both ends of a boss. The magnet and the semi-hard magnet have a ring shape with many planes facing each other, and provide a magnetic joint that has a simple structure and can exhibit characteristic efficiency.

In order to achieve the above object, the present invention provides a magnetic joint in which a plurality of permanent magnets and semi-hard magnets are arranged facing each other in the axial direction, and a housing in which permanent magnets are mounted on the inner sides of the permanent magnets in mutually opposite directions in the axial direction. A yoke portion is fixed to both ends of an assembly member that fixes the housing, the yoke portion is fixed to the drive shaft, and semi-hard magnets are placed on both sides of the non-magnetic material between the opposing permanent magnets of the divided yoke portion. The main idea is a magnetic joint that is mounted on a driven shaft, with the non-magnetic member fixed to the outer circumferential cover part and facing the permanent magnet.

Hereinafter, details will be explained based on embodiments of the present invention. FIG. 1 is a partially assembled sectional view of a magnetic hysteresis clutch, in which reference numeral 1 denotes a drive shaft, one end of which is connected to a drive source (not shown). 2,2'
The ring-shaped permanent magnets 2, 2' are fitted into ring-shaped recesses provided in the disc-shaped housings 3, 3' whose back surfaces serve as back plates, and are fixed with adhesive. 6 is a boss, and drive shaft 1
It is fixed by a detent key 8. A housing yoke portion is formed in the housing 3, 3' by fixing the permanent magnets 2, 2' to both ends of a boss so that the flat surfaces of the permanent magnets 2, 2' face each other in the axial direction.

4 and 4' are semi-hard magnets whose back surfaces are adhered to both sides of a non-magnetic disc-shaped housing 5, and these are inserted between the permanent magnets 2 and 2' of the housing yoke so as to face each other, Fixed in the axial direction. The housing 5 is fitted with the drive shaft 1 through bearings 7 and 7' at the center, and bearings 11 and 1 at the outside.
1', the cover ring 10 is fitted onto the cover 12 and fixed thereto to form a housing portion.

The assembly method is to insert the boss 6 into the drive shaft 1,
A disk-shaped housing to which a ring-shaped permanent magnet 2 is fixed is fixed to one end of a boss 6, and then semi-hard magnets are fixed to both sides of the housing 5 and rotatably attached to the boss 6 via a bearing 7. Further, a disk-shaped housing 3' to which a permanent magnet 2' is fixed is fixed to the other end of the boss 6 so as to face the semi-hard magnet 4'. The boss 6 is fixed to the drive shaft 1 by a rotation prevention key 8. The outer periphery of the disc-shaped housing 5 is fixed to a cover ring 10, and the covers 12, 12' are connected to the driven shaft, and are rotatably attached to the drive shaft via bearings 11, 11', thereby assembling the joint unit.

At least one set (an example of two sets is shown in Fig. 1) of the joint unit constituted by incorporating the housing yoke part and the housing part is assembled, and the drive system and driven system are connected to the key 8 and the bearing 7.
and 11, 11' to form a magnetic joint.

The permanent magnet 2 of the present invention is ring-shaped, and one surface is fixed to the housing 3, the other surface is magnetized with multiple poles, and semi-hard magnets are placed on opposite surfaces on both sides of the housing 5. It is fixed. Similarly, a permanent magnet 2' and a housing 3' are fixed to the opposite side of the boss 6.

With this configuration, as shown in Figure 2, the magnetic field from the ring-shaped permanent magnets 2 and 2' of the drive shaft magnetizes the opposing semi-hard magnets, and the magnetization between them creates an attractive force and torque is transmitted. .

The magnetic joint of the present invention is a housing yoke portion made of ring-shaped permanent magnets fixed to the housings 3, 3' as described above, and is a member that allows easy assembly of the housings 3, 3'. It sticks to the recess formed inside the. These are fixed to one side of the boss and similarly fixed to the other side, dividing it into two parts, so even if it is a large-capacity magnetic joint, it can be assembled individually very easily, and the bearings 7, 7' and 11 are attached to the shaft. The outer circumferential covering ring and the like can also be assembled with high precision via 11'.

In addition, the attraction force of the permanent magnet is canceled out for each opposing joint unit, so the thrust load is almost zero, so there is no effect on the bearing 7.
It is possible to obtain unprecedented effects such as the fact that the bearing does not fall over and the life of the bearing can therefore be extended.

In the present invention, it is of course possible to use the drive shaft 1 of the above embodiment as a driven shaft and the driven shaft 9 as the drive shaft 1. Furthermore, in the above embodiment, each joint unit is fitted to the drive shaft 1, but the drive shaft 1, the driven shaft 9 and the cover ring 10 are connected to each other.
may be assembled first, then the boss 6 to which the permanent magnet 2 and housing 3 are fixed is fitted to the drive shaft 1, and then the housing 5, permanent magnet 2' and housing 3' are fitted and fixed in sequence, Needless to say, the assembly order is not necessarily limited. Further, the yoke portion may be divided into two parts on either the driving side or the driven side. Furthermore, in the above embodiment, permanent magnets 2 and 2' are used as semi-hard magnets, but the present invention is applicable even if the arrangement is reversed or even if both are permanent magnets. be. Furthermore, the material and shape of these magnetic materials may be arbitrarily selected depending on the intended use as a magnetic joint.

Incidentally, the above explanation can be similarly applied to a magnetic hysteresis brake.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of an assembly according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. 1: Drive shaft, 2, 2': Permanent magnet, 3, 3': Housing, 4, 4': Semi-hard magnet, 5: Housing, 6: Boss, 9: Driven shaft, 10: Covering.

Claims (1)

[Claims] 1. In a magnetic joint in which a plurality of permanent magnets and semi-hard magnets are arranged to face each other in the axial direction, a housing with permanent magnets mounted on opposing sides in the axial direction is fixed to both ends of an assembly member that fixes the housing. to form a yoke part, the yoke part is fixed to the drive shaft, and between the opposing permanent magnets of the divided yoke part, semi-hard magnets are mounted on both sides of the non-magnetic material so as to face the permanent magnets, A magnetic joint characterized in that the non-magnetic member is fixed to an outer circumferential cover portion and attached to a driven shaft.